1 /* 2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying 3 file Documentation/scsi/st.txt for more information. 4 5 History: 6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. 7 Contribution and ideas from several people including (in alphabetical 8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, 9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, 10 Michael Schaefer, J"org Weule, and Eric Youngdale. 11 12 Copyright 1992 - 2016 Kai Makisara 13 email Kai.Makisara@kolumbus.fi 14 15 Some small formal changes - aeb, 950809 16 17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 18 */ 19 20 static const char *verstr = "20160209"; 21 22 #include <linux/module.h> 23 24 #include <linux/fs.h> 25 #include <linux/kernel.h> 26 #include <linux/sched/signal.h> 27 #include <linux/mm.h> 28 #include <linux/init.h> 29 #include <linux/string.h> 30 #include <linux/slab.h> 31 #include <linux/errno.h> 32 #include <linux/mtio.h> 33 #include <linux/cdrom.h> 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> 39 #include <linux/cdev.h> 40 #include <linux/idr.h> 41 #include <linux/delay.h> 42 #include <linux/mutex.h> 43 44 #include <linux/uaccess.h> 45 #include <asm/dma.h> 46 47 #include <scsi/scsi.h> 48 #include <scsi/scsi_dbg.h> 49 #include <scsi/scsi_device.h> 50 #include <scsi/scsi_driver.h> 51 #include <scsi/scsi_eh.h> 52 #include <scsi/scsi_host.h> 53 #include <scsi/scsi_ioctl.h> 54 #include <scsi/sg.h> 55 56 57 /* The driver prints some debugging information on the console if DEBUG 58 is defined and non-zero. */ 59 #define DEBUG 1 60 #define NO_DEBUG 0 61 62 #define ST_DEB_MSG KERN_NOTICE 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. */ 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; 84 static int debug_flag; 85 86 static struct class st_sysfs_class; 87 static const struct attribute_group *st_dev_groups[]; 88 static const struct attribute_group *st_drv_groups[]; 89 90 MODULE_AUTHOR("Kai Makisara"); 91 MODULE_DESCRIPTION("SCSI tape (st) driver"); 92 MODULE_LICENSE("GPL"); 93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 95 96 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 97 * of sysfs parameters (which module_param doesn't yet support). 98 * Sysfs parameters defined explicitly later. 99 */ 100 module_param_named(buffer_kbs, buffer_kbs, int, 0); 101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 102 module_param_named(max_sg_segs, max_sg_segs, int, 0); 103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 104 module_param_named(try_direct_io, try_direct_io, int, 0); 105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 106 module_param_named(debug_flag, debug_flag, int, 0); 107 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 108 109 110 /* Extra parameters for testing */ 111 module_param_named(try_rdio, try_rdio, int, 0); 112 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 113 module_param_named(try_wdio, try_wdio, int, 0); 114 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 115 116 #ifndef MODULE 117 static int write_threshold_kbs; /* retained for compatibility */ 118 static struct st_dev_parm { 119 char *name; 120 int *val; 121 } parms[] __initdata = { 122 { 123 "buffer_kbs", &buffer_kbs 124 }, 125 { /* Retained for compatibility with 2.4 */ 126 "write_threshold_kbs", &write_threshold_kbs 127 }, 128 { 129 "max_sg_segs", NULL 130 }, 131 { 132 "try_direct_io", &try_direct_io 133 }, 134 { 135 "debug_flag", &debug_flag 136 } 137 }; 138 #endif 139 140 /* Restrict the number of modes so that names for all are assigned */ 141 #if ST_NBR_MODES > 16 142 #error "Maximum number of modes is 16" 143 #endif 144 /* Bit reversed order to get same names for same minors with all 145 mode counts */ 146 static const char *st_formats[] = { 147 "", "r", "k", "s", "l", "t", "o", "u", 148 "m", "v", "p", "x", "a", "y", "q", "z"}; 149 150 /* The default definitions have been moved to st_options.h */ 151 152 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 153 154 /* The buffer size should fit into the 24 bits for length in the 155 6-byte SCSI read and write commands. */ 156 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 157 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 158 #endif 159 160 static int debugging = DEBUG; 161 162 #define MAX_RETRIES 0 163 #define MAX_WRITE_RETRIES 0 164 #define MAX_READY_RETRIES 0 165 #define NO_TAPE NOT_READY 166 167 #define ST_TIMEOUT (900 * HZ) 168 #define ST_LONG_TIMEOUT (14000 * HZ) 169 170 /* Remove mode bits and auto-rewind bit (7) */ 171 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 172 (iminor(x) & ((1 << ST_MODE_SHIFT)-1))) 173 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 174 175 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 176 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 178 179 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 180 24 bits) */ 181 #define SET_DENS_AND_BLK 0x10001 182 183 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 184 static int st_max_sg_segs = ST_MAX_SG; 185 186 static int modes_defined; 187 188 static int enlarge_buffer(struct st_buffer *, int, int); 189 static void clear_buffer(struct st_buffer *); 190 static void normalize_buffer(struct st_buffer *); 191 static int append_to_buffer(const char __user *, struct st_buffer *, int); 192 static int from_buffer(struct st_buffer *, char __user *, int); 193 static void move_buffer_data(struct st_buffer *, int); 194 195 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 196 unsigned long, size_t, int); 197 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 198 199 static int st_probe(struct device *); 200 static int st_remove(struct device *); 201 202 static struct scsi_driver st_template = { 203 .gendrv = { 204 .name = "st", 205 .owner = THIS_MODULE, 206 .probe = st_probe, 207 .remove = st_remove, 208 .groups = st_drv_groups, 209 }, 210 }; 211 212 static int st_compression(struct scsi_tape *, int); 213 214 static int find_partition(struct scsi_tape *); 215 static int switch_partition(struct scsi_tape *); 216 217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 218 219 static void scsi_tape_release(struct kref *); 220 221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 222 223 static DEFINE_MUTEX(st_ref_mutex); 224 static DEFINE_SPINLOCK(st_index_lock); 225 static DEFINE_SPINLOCK(st_use_lock); 226 static DEFINE_IDR(st_index_idr); 227 228 229 230 #include "osst_detect.h" 231 #ifndef SIGS_FROM_OSST 232 #define SIGS_FROM_OSST \ 233 {"OnStream", "SC-", "", "osst"}, \ 234 {"OnStream", "DI-", "", "osst"}, \ 235 {"OnStream", "DP-", "", "osst"}, \ 236 {"OnStream", "USB", "", "osst"}, \ 237 {"OnStream", "FW-", "", "osst"} 238 #endif 239 240 static struct scsi_tape *scsi_tape_get(int dev) 241 { 242 struct scsi_tape *STp = NULL; 243 244 mutex_lock(&st_ref_mutex); 245 spin_lock(&st_index_lock); 246 247 STp = idr_find(&st_index_idr, dev); 248 if (!STp) goto out; 249 250 kref_get(&STp->kref); 251 252 if (!STp->device) 253 goto out_put; 254 255 if (scsi_device_get(STp->device)) 256 goto out_put; 257 258 goto out; 259 260 out_put: 261 kref_put(&STp->kref, scsi_tape_release); 262 STp = NULL; 263 out: 264 spin_unlock(&st_index_lock); 265 mutex_unlock(&st_ref_mutex); 266 return STp; 267 } 268 269 static void scsi_tape_put(struct scsi_tape *STp) 270 { 271 struct scsi_device *sdev = STp->device; 272 273 mutex_lock(&st_ref_mutex); 274 kref_put(&STp->kref, scsi_tape_release); 275 scsi_device_put(sdev); 276 mutex_unlock(&st_ref_mutex); 277 } 278 279 struct st_reject_data { 280 char *vendor; 281 char *model; 282 char *rev; 283 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 284 }; 285 286 static struct st_reject_data reject_list[] = { 287 /* {"XXX", "Yy-", "", NULL}, example */ 288 SIGS_FROM_OSST, 289 {NULL, }}; 290 291 /* If the device signature is on the list of incompatible drives, the 292 function returns a pointer to the name of the correct driver (if known) */ 293 static char * st_incompatible(struct scsi_device* SDp) 294 { 295 struct st_reject_data *rp; 296 297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 299 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 301 if (rp->driver_hint) 302 return rp->driver_hint; 303 else 304 return "unknown"; 305 } 306 return NULL; 307 } 308 309 310 static inline char *tape_name(struct scsi_tape *tape) 311 { 312 return tape->disk->disk_name; 313 } 314 315 #define st_printk(prefix, t, fmt, a...) \ 316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) 317 #ifdef DEBUG 318 #define DEBC_printk(t, fmt, a...) \ 319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 320 #else 321 #define DEBC_printk(t, fmt, a...) 322 #endif 323 324 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 325 { 326 const u8 *ucp; 327 const u8 *sense = SRpnt->sense; 328 329 s->have_sense = scsi_normalize_sense(SRpnt->sense, 330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 331 s->flags = 0; 332 333 if (s->have_sense) { 334 s->deferred = 0; 335 s->remainder_valid = 336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 337 switch (sense[0] & 0x7f) { 338 case 0x71: 339 s->deferred = 1; 340 /* fall through */ 341 case 0x70: 342 s->fixed_format = 1; 343 s->flags = sense[2] & 0xe0; 344 break; 345 case 0x73: 346 s->deferred = 1; 347 /* fall through */ 348 case 0x72: 349 s->fixed_format = 0; 350 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 351 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 352 break; 353 } 354 } 355 } 356 357 358 /* Convert the result to success code */ 359 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 360 { 361 int result = SRpnt->result; 362 u8 scode; 363 DEB(const char *stp;) 364 char *name = tape_name(STp); 365 struct st_cmdstatus *cmdstatp; 366 367 if (!result) 368 return 0; 369 370 cmdstatp = &STp->buffer->cmdstat; 371 st_analyze_sense(SRpnt, cmdstatp); 372 373 if (cmdstatp->have_sense) 374 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 375 else 376 scode = 0; 377 378 DEB( 379 if (debugging) { 380 st_printk(ST_DEB_MSG, STp, 381 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 382 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 383 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 384 if (cmdstatp->have_sense) 385 __scsi_print_sense(STp->device, name, 386 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 387 } ) /* end DEB */ 388 if (!debugging) { /* Abnormal conditions for tape */ 389 if (!cmdstatp->have_sense) 390 st_printk(KERN_WARNING, STp, 391 "Error %x (driver bt 0x%x, host bt 0x%x).\n", 392 result, driver_byte(result), host_byte(result)); 393 else if (cmdstatp->have_sense && 394 scode != NO_SENSE && 395 scode != RECOVERED_ERROR && 396 /* scode != UNIT_ATTENTION && */ 397 scode != BLANK_CHECK && 398 scode != VOLUME_OVERFLOW && 399 SRpnt->cmd[0] != MODE_SENSE && 400 SRpnt->cmd[0] != TEST_UNIT_READY) { 401 402 __scsi_print_sense(STp->device, name, 403 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 404 } 405 } 406 407 if (cmdstatp->fixed_format && 408 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 409 if (STp->cln_sense_value) 410 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 411 STp->cln_sense_mask) == STp->cln_sense_value); 412 else 413 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 414 STp->cln_sense_mask) != 0); 415 } 416 if (cmdstatp->have_sense && 417 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 418 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 419 420 STp->pos_unknown |= STp->device->was_reset; 421 422 if (cmdstatp->have_sense && 423 scode == RECOVERED_ERROR 424 #if ST_RECOVERED_WRITE_FATAL 425 && SRpnt->cmd[0] != WRITE_6 426 && SRpnt->cmd[0] != WRITE_FILEMARKS 427 #endif 428 ) { 429 STp->recover_count++; 430 STp->recover_reg++; 431 432 DEB( 433 if (debugging) { 434 if (SRpnt->cmd[0] == READ_6) 435 stp = "read"; 436 else if (SRpnt->cmd[0] == WRITE_6) 437 stp = "write"; 438 else 439 stp = "ioctl"; 440 st_printk(ST_DEB_MSG, STp, 441 "Recovered %s error (%d).\n", 442 stp, STp->recover_count); 443 } ) /* end DEB */ 444 445 if (cmdstatp->flags == 0) 446 return 0; 447 } 448 return (-EIO); 449 } 450 451 static struct st_request *st_allocate_request(struct scsi_tape *stp) 452 { 453 struct st_request *streq; 454 455 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 456 if (streq) 457 streq->stp = stp; 458 else { 459 st_printk(KERN_ERR, stp, 460 "Can't get SCSI request.\n"); 461 if (signal_pending(current)) 462 stp->buffer->syscall_result = -EINTR; 463 else 464 stp->buffer->syscall_result = -EBUSY; 465 } 466 467 return streq; 468 } 469 470 static void st_release_request(struct st_request *streq) 471 { 472 kfree(streq); 473 } 474 475 static void st_do_stats(struct scsi_tape *STp, struct request *req) 476 { 477 ktime_t now; 478 479 now = ktime_get(); 480 if (scsi_req(req)->cmd[0] == WRITE_6) { 481 now = ktime_sub(now, STp->stats->write_time); 482 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 484 atomic64_inc(&STp->stats->write_cnt); 485 if (scsi_req(req)->result) { 486 atomic64_add(atomic_read(&STp->stats->last_write_size) 487 - STp->buffer->cmdstat.residual, 488 &STp->stats->write_byte_cnt); 489 if (STp->buffer->cmdstat.residual > 0) 490 atomic64_inc(&STp->stats->resid_cnt); 491 } else 492 atomic64_add(atomic_read(&STp->stats->last_write_size), 493 &STp->stats->write_byte_cnt); 494 } else if (scsi_req(req)->cmd[0] == READ_6) { 495 now = ktime_sub(now, STp->stats->read_time); 496 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 498 atomic64_inc(&STp->stats->read_cnt); 499 if (scsi_req(req)->result) { 500 atomic64_add(atomic_read(&STp->stats->last_read_size) 501 - STp->buffer->cmdstat.residual, 502 &STp->stats->read_byte_cnt); 503 if (STp->buffer->cmdstat.residual > 0) 504 atomic64_inc(&STp->stats->resid_cnt); 505 } else 506 atomic64_add(atomic_read(&STp->stats->last_read_size), 507 &STp->stats->read_byte_cnt); 508 } else { 509 now = ktime_sub(now, STp->stats->other_time); 510 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 511 atomic64_inc(&STp->stats->other_cnt); 512 } 513 atomic64_dec(&STp->stats->in_flight); 514 } 515 516 static void st_scsi_execute_end(struct request *req, blk_status_t status) 517 { 518 struct st_request *SRpnt = req->end_io_data; 519 struct scsi_request *rq = scsi_req(req); 520 struct scsi_tape *STp = SRpnt->stp; 521 struct bio *tmp; 522 523 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result; 524 STp->buffer->cmdstat.residual = rq->resid_len; 525 526 st_do_stats(STp, req); 527 528 tmp = SRpnt->bio; 529 if (rq->sense_len) 530 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE); 531 if (SRpnt->waiting) 532 complete(SRpnt->waiting); 533 534 blk_rq_unmap_user(tmp); 535 blk_put_request(req); 536 } 537 538 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 539 int data_direction, void *buffer, unsigned bufflen, 540 int timeout, int retries) 541 { 542 struct request *req; 543 struct scsi_request *rq; 544 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 545 int err = 0; 546 struct scsi_tape *STp = SRpnt->stp; 547 548 req = blk_get_request(SRpnt->stp->device->request_queue, 549 data_direction == DMA_TO_DEVICE ? 550 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); 551 if (IS_ERR(req)) 552 return DRIVER_ERROR << 24; 553 rq = scsi_req(req); 554 req->rq_flags |= RQF_QUIET; 555 556 mdata->null_mapped = 1; 557 558 if (bufflen) { 559 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 560 GFP_KERNEL); 561 if (err) { 562 blk_put_request(req); 563 return DRIVER_ERROR << 24; 564 } 565 } 566 567 atomic64_inc(&STp->stats->in_flight); 568 if (cmd[0] == WRITE_6) { 569 atomic_set(&STp->stats->last_write_size, bufflen); 570 STp->stats->write_time = ktime_get(); 571 } else if (cmd[0] == READ_6) { 572 atomic_set(&STp->stats->last_read_size, bufflen); 573 STp->stats->read_time = ktime_get(); 574 } else { 575 STp->stats->other_time = ktime_get(); 576 } 577 578 SRpnt->bio = req->bio; 579 rq->cmd_len = COMMAND_SIZE(cmd[0]); 580 memset(rq->cmd, 0, BLK_MAX_CDB); 581 memcpy(rq->cmd, cmd, rq->cmd_len); 582 req->timeout = timeout; 583 rq->retries = retries; 584 req->end_io_data = SRpnt; 585 586 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); 587 return 0; 588 } 589 590 /* Do the scsi command. Waits until command performed if do_wait is true. 591 Otherwise write_behind_check() is used to check that the command 592 has finished. */ 593 static struct st_request * 594 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 595 int bytes, int direction, int timeout, int retries, int do_wait) 596 { 597 struct completion *waiting; 598 struct rq_map_data *mdata = &STp->buffer->map_data; 599 int ret; 600 601 /* if async, make sure there's no command outstanding */ 602 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 603 st_printk(KERN_ERR, STp, 604 "Async command already active.\n"); 605 if (signal_pending(current)) 606 (STp->buffer)->syscall_result = (-EINTR); 607 else 608 (STp->buffer)->syscall_result = (-EBUSY); 609 return NULL; 610 } 611 612 if (!SRpnt) { 613 SRpnt = st_allocate_request(STp); 614 if (!SRpnt) 615 return NULL; 616 } 617 618 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 619 which IO is outstanding. It's nulled out when the IO completes. */ 620 if (!do_wait) 621 (STp->buffer)->last_SRpnt = SRpnt; 622 623 waiting = &STp->wait; 624 init_completion(waiting); 625 SRpnt->waiting = waiting; 626 627 if (STp->buffer->do_dio) { 628 mdata->page_order = 0; 629 mdata->nr_entries = STp->buffer->sg_segs; 630 mdata->pages = STp->buffer->mapped_pages; 631 } else { 632 mdata->page_order = STp->buffer->reserved_page_order; 633 mdata->nr_entries = 634 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 635 mdata->pages = STp->buffer->reserved_pages; 636 mdata->offset = 0; 637 } 638 639 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 640 STp->buffer->cmdstat.have_sense = 0; 641 STp->buffer->syscall_result = 0; 642 643 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 644 retries); 645 if (ret) { 646 /* could not allocate the buffer or request was too large */ 647 (STp->buffer)->syscall_result = (-EBUSY); 648 (STp->buffer)->last_SRpnt = NULL; 649 } else if (do_wait) { 650 wait_for_completion(waiting); 651 SRpnt->waiting = NULL; 652 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 653 } 654 655 return SRpnt; 656 } 657 658 659 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 660 write has been correct but EOM early warning reached, -EIO if write ended in 661 error or zero if write successful. Asynchronous writes are used only in 662 variable block mode. */ 663 static int write_behind_check(struct scsi_tape * STp) 664 { 665 int retval = 0; 666 struct st_buffer *STbuffer; 667 struct st_partstat *STps; 668 struct st_cmdstatus *cmdstatp; 669 struct st_request *SRpnt; 670 671 STbuffer = STp->buffer; 672 if (!STbuffer->writing) 673 return 0; 674 675 DEB( 676 if (STp->write_pending) 677 STp->nbr_waits++; 678 else 679 STp->nbr_finished++; 680 ) /* end DEB */ 681 682 wait_for_completion(&(STp->wait)); 683 SRpnt = STbuffer->last_SRpnt; 684 STbuffer->last_SRpnt = NULL; 685 SRpnt->waiting = NULL; 686 687 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 688 st_release_request(SRpnt); 689 690 STbuffer->buffer_bytes -= STbuffer->writing; 691 STps = &(STp->ps[STp->partition]); 692 if (STps->drv_block >= 0) { 693 if (STp->block_size == 0) 694 STps->drv_block++; 695 else 696 STps->drv_block += STbuffer->writing / STp->block_size; 697 } 698 699 cmdstatp = &STbuffer->cmdstat; 700 if (STbuffer->syscall_result) { 701 retval = -EIO; 702 if (cmdstatp->have_sense && !cmdstatp->deferred && 703 (cmdstatp->flags & SENSE_EOM) && 704 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 705 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 706 /* EOM at write-behind, has all data been written? */ 707 if (!cmdstatp->remainder_valid || 708 cmdstatp->uremainder64 == 0) 709 retval = -ENOSPC; 710 } 711 if (retval == -EIO) 712 STps->drv_block = -1; 713 } 714 STbuffer->writing = 0; 715 716 DEB(if (debugging && retval) 717 st_printk(ST_DEB_MSG, STp, 718 "Async write error %x, return value %d.\n", 719 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 720 721 return retval; 722 } 723 724 725 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 726 it messes up the block number). */ 727 static int cross_eof(struct scsi_tape * STp, int forward) 728 { 729 struct st_request *SRpnt; 730 unsigned char cmd[MAX_COMMAND_SIZE]; 731 732 cmd[0] = SPACE; 733 cmd[1] = 0x01; /* Space FileMarks */ 734 if (forward) { 735 cmd[2] = cmd[3] = 0; 736 cmd[4] = 1; 737 } else 738 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 739 cmd[5] = 0; 740 741 DEBC_printk(STp, "Stepping over filemark %s.\n", 742 forward ? "forward" : "backward"); 743 744 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 745 STp->device->request_queue->rq_timeout, 746 MAX_RETRIES, 1); 747 if (!SRpnt) 748 return (STp->buffer)->syscall_result; 749 750 st_release_request(SRpnt); 751 SRpnt = NULL; 752 753 if ((STp->buffer)->cmdstat.midlevel_result != 0) 754 st_printk(KERN_ERR, STp, 755 "Stepping over filemark %s failed.\n", 756 forward ? "forward" : "backward"); 757 758 return (STp->buffer)->syscall_result; 759 } 760 761 762 /* Flush the write buffer (never need to write if variable blocksize). */ 763 static int st_flush_write_buffer(struct scsi_tape * STp) 764 { 765 int transfer, blks; 766 int result; 767 unsigned char cmd[MAX_COMMAND_SIZE]; 768 struct st_request *SRpnt; 769 struct st_partstat *STps; 770 771 result = write_behind_check(STp); 772 if (result) 773 return result; 774 775 result = 0; 776 if (STp->dirty == 1) { 777 778 transfer = STp->buffer->buffer_bytes; 779 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 780 781 memset(cmd, 0, MAX_COMMAND_SIZE); 782 cmd[0] = WRITE_6; 783 cmd[1] = 1; 784 blks = transfer / STp->block_size; 785 cmd[2] = blks >> 16; 786 cmd[3] = blks >> 8; 787 cmd[4] = blks; 788 789 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 790 STp->device->request_queue->rq_timeout, 791 MAX_WRITE_RETRIES, 1); 792 if (!SRpnt) 793 return (STp->buffer)->syscall_result; 794 795 STps = &(STp->ps[STp->partition]); 796 if ((STp->buffer)->syscall_result != 0) { 797 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 798 799 if (cmdstatp->have_sense && !cmdstatp->deferred && 800 (cmdstatp->flags & SENSE_EOM) && 801 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 802 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 803 (!cmdstatp->remainder_valid || 804 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 805 STp->dirty = 0; 806 (STp->buffer)->buffer_bytes = 0; 807 if (STps->drv_block >= 0) 808 STps->drv_block += blks; 809 result = (-ENOSPC); 810 } else { 811 st_printk(KERN_ERR, STp, "Error on flush.\n"); 812 STps->drv_block = (-1); 813 result = (-EIO); 814 } 815 } else { 816 if (STps->drv_block >= 0) 817 STps->drv_block += blks; 818 STp->dirty = 0; 819 (STp->buffer)->buffer_bytes = 0; 820 } 821 st_release_request(SRpnt); 822 SRpnt = NULL; 823 } 824 return result; 825 } 826 827 828 /* Flush the tape buffer. The tape will be positioned correctly unless 829 seek_next is true. */ 830 static int flush_buffer(struct scsi_tape *STp, int seek_next) 831 { 832 int backspace, result; 833 struct st_partstat *STps; 834 835 /* 836 * If there was a bus reset, block further access 837 * to this device. 838 */ 839 if (STp->pos_unknown) 840 return (-EIO); 841 842 if (STp->ready != ST_READY) 843 return 0; 844 STps = &(STp->ps[STp->partition]); 845 if (STps->rw == ST_WRITING) /* Writing */ 846 return st_flush_write_buffer(STp); 847 848 if (STp->block_size == 0) 849 return 0; 850 851 backspace = ((STp->buffer)->buffer_bytes + 852 (STp->buffer)->read_pointer) / STp->block_size - 853 ((STp->buffer)->read_pointer + STp->block_size - 1) / 854 STp->block_size; 855 (STp->buffer)->buffer_bytes = 0; 856 (STp->buffer)->read_pointer = 0; 857 result = 0; 858 if (!seek_next) { 859 if (STps->eof == ST_FM_HIT) { 860 result = cross_eof(STp, 0); /* Back over the EOF hit */ 861 if (!result) 862 STps->eof = ST_NOEOF; 863 else { 864 if (STps->drv_file >= 0) 865 STps->drv_file++; 866 STps->drv_block = 0; 867 } 868 } 869 if (!result && backspace > 0) 870 result = st_int_ioctl(STp, MTBSR, backspace); 871 } else if (STps->eof == ST_FM_HIT) { 872 if (STps->drv_file >= 0) 873 STps->drv_file++; 874 STps->drv_block = 0; 875 STps->eof = ST_NOEOF; 876 } 877 return result; 878 879 } 880 881 /* Set the mode parameters */ 882 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 883 { 884 int set_it = 0; 885 unsigned long arg; 886 887 if (!STp->density_changed && 888 STm->default_density >= 0 && 889 STm->default_density != STp->density) { 890 arg = STm->default_density; 891 set_it = 1; 892 } else 893 arg = STp->density; 894 arg <<= MT_ST_DENSITY_SHIFT; 895 if (!STp->blksize_changed && 896 STm->default_blksize >= 0 && 897 STm->default_blksize != STp->block_size) { 898 arg |= STm->default_blksize; 899 set_it = 1; 900 } else 901 arg |= STp->block_size; 902 if (set_it && 903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 904 st_printk(KERN_WARNING, STp, 905 "Can't set default block size to %d bytes " 906 "and density %x.\n", 907 STm->default_blksize, STm->default_density); 908 if (modes_defined) 909 return (-EINVAL); 910 } 911 return 0; 912 } 913 914 915 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 916 static int do_door_lock(struct scsi_tape * STp, int do_lock) 917 { 918 int retval; 919 920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 921 922 retval = scsi_set_medium_removal(STp->device, 923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 924 if (!retval) 925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 926 else 927 STp->door_locked = ST_LOCK_FAILS; 928 return retval; 929 } 930 931 932 /* Set the internal state after reset */ 933 static void reset_state(struct scsi_tape *STp) 934 { 935 int i; 936 struct st_partstat *STps; 937 938 STp->pos_unknown = 0; 939 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 940 STps = &(STp->ps[i]); 941 STps->rw = ST_IDLE; 942 STps->eof = ST_NOEOF; 943 STps->at_sm = 0; 944 STps->last_block_valid = 0; 945 STps->drv_block = -1; 946 STps->drv_file = -1; 947 } 948 if (STp->can_partitions) { 949 STp->partition = find_partition(STp); 950 if (STp->partition < 0) 951 STp->partition = 0; 952 STp->new_partition = STp->partition; 953 } 954 } 955 956 /* Test if the drive is ready. Returns either one of the codes below or a negative system 957 error code. */ 958 #define CHKRES_READY 0 959 #define CHKRES_NEW_SESSION 1 960 #define CHKRES_NOT_READY 2 961 #define CHKRES_NO_TAPE 3 962 963 #define MAX_ATTENTIONS 10 964 965 static int test_ready(struct scsi_tape *STp, int do_wait) 966 { 967 int attentions, waits, max_wait, scode; 968 int retval = CHKRES_READY, new_session = 0; 969 unsigned char cmd[MAX_COMMAND_SIZE]; 970 struct st_request *SRpnt = NULL; 971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 972 973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 974 975 for (attentions=waits=0; ; ) { 976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 977 cmd[0] = TEST_UNIT_READY; 978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 979 STp->long_timeout, MAX_READY_RETRIES, 1); 980 981 if (!SRpnt) { 982 retval = (STp->buffer)->syscall_result; 983 break; 984 } 985 986 if (cmdstatp->have_sense) { 987 988 scode = cmdstatp->sense_hdr.sense_key; 989 990 if (scode == UNIT_ATTENTION) { /* New media? */ 991 new_session = 1; 992 if (attentions < MAX_ATTENTIONS) { 993 attentions++; 994 continue; 995 } 996 else { 997 retval = (-EIO); 998 break; 999 } 1000 } 1001 1002 if (scode == NOT_READY) { 1003 if (waits < max_wait) { 1004 if (msleep_interruptible(1000)) { 1005 retval = (-EINTR); 1006 break; 1007 } 1008 waits++; 1009 continue; 1010 } 1011 else { 1012 if ((STp->device)->scsi_level >= SCSI_2 && 1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1014 retval = CHKRES_NO_TAPE; 1015 else 1016 retval = CHKRES_NOT_READY; 1017 break; 1018 } 1019 } 1020 } 1021 1022 retval = (STp->buffer)->syscall_result; 1023 if (!retval) 1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1025 break; 1026 } 1027 1028 if (SRpnt != NULL) 1029 st_release_request(SRpnt); 1030 return retval; 1031 } 1032 1033 1034 /* See if the drive is ready and gather information about the tape. Return values: 1035 < 0 negative error code from errno.h 1036 0 drive ready 1037 1 drive not ready (possibly no tape) 1038 */ 1039 static int check_tape(struct scsi_tape *STp, struct file *filp) 1040 { 1041 int i, retval, new_session = 0, do_wait; 1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1043 unsigned short st_flags = filp->f_flags; 1044 struct st_request *SRpnt = NULL; 1045 struct st_modedef *STm; 1046 struct st_partstat *STps; 1047 struct inode *inode = file_inode(filp); 1048 int mode = TAPE_MODE(inode); 1049 1050 STp->ready = ST_READY; 1051 1052 if (mode != STp->current_mode) { 1053 DEBC_printk(STp, "Mode change from %d to %d.\n", 1054 STp->current_mode, mode); 1055 new_session = 1; 1056 STp->current_mode = mode; 1057 } 1058 STm = &(STp->modes[STp->current_mode]); 1059 1060 saved_cleaning = STp->cleaning_req; 1061 STp->cleaning_req = 0; 1062 1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1064 retval = test_ready(STp, do_wait); 1065 1066 if (retval < 0) 1067 goto err_out; 1068 1069 if (retval == CHKRES_NEW_SESSION) { 1070 STp->pos_unknown = 0; 1071 STp->partition = STp->new_partition = 0; 1072 if (STp->can_partitions) 1073 STp->nbr_partitions = 1; /* This guess will be updated later 1074 if necessary */ 1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1076 STps = &(STp->ps[i]); 1077 STps->rw = ST_IDLE; 1078 STps->eof = ST_NOEOF; 1079 STps->at_sm = 0; 1080 STps->last_block_valid = 0; 1081 STps->drv_block = 0; 1082 STps->drv_file = 0; 1083 } 1084 new_session = 1; 1085 } 1086 else { 1087 STp->cleaning_req |= saved_cleaning; 1088 1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1090 if (retval == CHKRES_NO_TAPE) 1091 STp->ready = ST_NO_TAPE; 1092 else 1093 STp->ready = ST_NOT_READY; 1094 1095 STp->density = 0; /* Clear the erroneous "residue" */ 1096 STp->write_prot = 0; 1097 STp->block_size = 0; 1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1099 STp->partition = STp->new_partition = 0; 1100 STp->door_locked = ST_UNLOCKED; 1101 return CHKRES_NOT_READY; 1102 } 1103 } 1104 1105 if (STp->omit_blklims) 1106 STp->min_block = STp->max_block = (-1); 1107 else { 1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1109 cmd[0] = READ_BLOCK_LIMITS; 1110 1111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1112 STp->device->request_queue->rq_timeout, 1113 MAX_READY_RETRIES, 1); 1114 if (!SRpnt) { 1115 retval = (STp->buffer)->syscall_result; 1116 goto err_out; 1117 } 1118 1119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1120 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1123 (STp->buffer)->b_data[5]; 1124 if ( DEB( debugging || ) !STp->inited) 1125 st_printk(KERN_INFO, STp, 1126 "Block limits %d - %d bytes.\n", 1127 STp->min_block, STp->max_block); 1128 } else { 1129 STp->min_block = STp->max_block = (-1); 1130 DEBC_printk(STp, "Can't read block limits.\n"); 1131 } 1132 } 1133 1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1135 cmd[0] = MODE_SENSE; 1136 cmd[4] = 12; 1137 1138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1139 STp->device->request_queue->rq_timeout, 1140 MAX_READY_RETRIES, 1); 1141 if (!SRpnt) { 1142 retval = (STp->buffer)->syscall_result; 1143 goto err_out; 1144 } 1145 1146 if ((STp->buffer)->syscall_result != 0) { 1147 DEBC_printk(STp, "No Mode Sense.\n"); 1148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1150 STp->drv_write_prot = 0; 1151 } else { 1152 DEBC_printk(STp,"Mode sense. Length %d, " 1153 "medium %x, WBS %x, BLL %d\n", 1154 (STp->buffer)->b_data[0], 1155 (STp->buffer)->b_data[1], 1156 (STp->buffer)->b_data[2], 1157 (STp->buffer)->b_data[3]); 1158 1159 if ((STp->buffer)->b_data[3] >= 8) { 1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1161 STp->density = (STp->buffer)->b_data[4]; 1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1164 DEBC_printk(STp, "Density %x, tape length: %x, " 1165 "drv buffer: %d\n", 1166 STp->density, 1167 (STp->buffer)->b_data[5] * 65536 + 1168 (STp->buffer)->b_data[6] * 256 + 1169 (STp->buffer)->b_data[7], 1170 STp->drv_buffer); 1171 } 1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1173 if (!STp->drv_buffer && STp->immediate_filemark) { 1174 st_printk(KERN_WARNING, STp, 1175 "non-buffered tape: disabling " 1176 "writing immediate filemarks\n"); 1177 STp->immediate_filemark = 0; 1178 } 1179 } 1180 st_release_request(SRpnt); 1181 SRpnt = NULL; 1182 STp->inited = 1; 1183 1184 if (STp->block_size > 0) 1185 (STp->buffer)->buffer_blocks = 1186 (STp->buffer)->buffer_size / STp->block_size; 1187 else 1188 (STp->buffer)->buffer_blocks = 1; 1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1190 1191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1192 STp->block_size, (STp->buffer)->buffer_size, 1193 (STp->buffer)->buffer_blocks); 1194 1195 if (STp->drv_write_prot) { 1196 STp->write_prot = 1; 1197 1198 DEBC_printk(STp, "Write protected\n"); 1199 1200 if (do_wait && 1201 ((st_flags & O_ACCMODE) == O_WRONLY || 1202 (st_flags & O_ACCMODE) == O_RDWR)) { 1203 retval = (-EROFS); 1204 goto err_out; 1205 } 1206 } 1207 1208 if (STp->can_partitions && STp->nbr_partitions < 1) { 1209 /* This code is reached when the device is opened for the first time 1210 after the driver has been initialized with tape in the drive and the 1211 partition support has been enabled. */ 1212 DEBC_printk(STp, "Updating partition number in status.\n"); 1213 if ((STp->partition = find_partition(STp)) < 0) { 1214 retval = STp->partition; 1215 goto err_out; 1216 } 1217 STp->new_partition = STp->partition; 1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1219 } 1220 1221 if (new_session) { /* Change the drive parameters for the new mode */ 1222 STp->density_changed = STp->blksize_changed = 0; 1223 STp->compression_changed = 0; 1224 if (!(STm->defaults_for_writes) && 1225 (retval = set_mode_densblk(STp, STm)) < 0) 1226 goto err_out; 1227 1228 if (STp->default_drvbuffer != 0xff) { 1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1230 st_printk(KERN_WARNING, STp, 1231 "Can't set default drive " 1232 "buffering to %d.\n", 1233 STp->default_drvbuffer); 1234 } 1235 } 1236 1237 return CHKRES_READY; 1238 1239 err_out: 1240 return retval; 1241 } 1242 1243 1244 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1245 module count. */ 1246 static int st_open(struct inode *inode, struct file *filp) 1247 { 1248 int i, retval = (-EIO); 1249 int resumed = 0; 1250 struct scsi_tape *STp; 1251 struct st_partstat *STps; 1252 int dev = TAPE_NR(inode); 1253 1254 /* 1255 * We really want to do nonseekable_open(inode, filp); here, but some 1256 * versions of tar incorrectly call lseek on tapes and bail out if that 1257 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1258 */ 1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1260 1261 if (!(STp = scsi_tape_get(dev))) { 1262 return -ENXIO; 1263 } 1264 1265 filp->private_data = STp; 1266 1267 spin_lock(&st_use_lock); 1268 if (STp->in_use) { 1269 spin_unlock(&st_use_lock); 1270 scsi_tape_put(STp); 1271 DEBC_printk(STp, "Device already in use.\n"); 1272 return (-EBUSY); 1273 } 1274 1275 STp->in_use = 1; 1276 spin_unlock(&st_use_lock); 1277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1278 1279 if (scsi_autopm_get_device(STp->device) < 0) { 1280 retval = -EIO; 1281 goto err_out; 1282 } 1283 resumed = 1; 1284 if (!scsi_block_when_processing_errors(STp->device)) { 1285 retval = (-ENXIO); 1286 goto err_out; 1287 } 1288 1289 /* See that we have at least a one page buffer available */ 1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1291 st_printk(KERN_WARNING, STp, 1292 "Can't allocate one page tape buffer.\n"); 1293 retval = (-EOVERFLOW); 1294 goto err_out; 1295 } 1296 1297 (STp->buffer)->cleared = 0; 1298 (STp->buffer)->writing = 0; 1299 (STp->buffer)->syscall_result = 0; 1300 1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1302 1303 STp->dirty = 0; 1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1305 STps = &(STp->ps[i]); 1306 STps->rw = ST_IDLE; 1307 } 1308 STp->try_dio_now = STp->try_dio; 1309 STp->recover_count = 0; 1310 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1312 1313 retval = check_tape(STp, filp); 1314 if (retval < 0) 1315 goto err_out; 1316 if ((filp->f_flags & O_NONBLOCK) == 0 && 1317 retval != CHKRES_READY) { 1318 if (STp->ready == NO_TAPE) 1319 retval = (-ENOMEDIUM); 1320 else 1321 retval = (-EIO); 1322 goto err_out; 1323 } 1324 return 0; 1325 1326 err_out: 1327 normalize_buffer(STp->buffer); 1328 spin_lock(&st_use_lock); 1329 STp->in_use = 0; 1330 spin_unlock(&st_use_lock); 1331 if (resumed) 1332 scsi_autopm_put_device(STp->device); 1333 scsi_tape_put(STp); 1334 return retval; 1335 1336 } 1337 1338 1339 /* Flush the tape buffer before close */ 1340 static int st_flush(struct file *filp, fl_owner_t id) 1341 { 1342 int result = 0, result2; 1343 unsigned char cmd[MAX_COMMAND_SIZE]; 1344 struct st_request *SRpnt; 1345 struct scsi_tape *STp = filp->private_data; 1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1347 struct st_partstat *STps = &(STp->ps[STp->partition]); 1348 1349 if (file_count(filp) > 1) 1350 return 0; 1351 1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1353 result = st_flush_write_buffer(STp); 1354 if (result != 0 && result != (-ENOSPC)) 1355 goto out; 1356 } 1357 1358 if (STp->can_partitions && 1359 (result2 = switch_partition(STp)) < 0) { 1360 DEBC_printk(STp, "switch_partition at close failed.\n"); 1361 if (result == 0) 1362 result = result2; 1363 goto out; 1364 } 1365 1366 DEBC( if (STp->nbr_requests) 1367 st_printk(KERN_DEBUG, STp, 1368 "Number of r/w requests %d, dio used in %d, " 1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1370 STp->nbr_pages)); 1371 1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1374 1375 #if DEBUG 1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1377 STp->nbr_waits, STp->nbr_finished); 1378 #endif 1379 memset(cmd, 0, MAX_COMMAND_SIZE); 1380 cmd[0] = WRITE_FILEMARKS; 1381 if (STp->immediate_filemark) 1382 cmd[1] = 1; 1383 cmd[4] = 1 + STp->two_fm; 1384 1385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1386 STp->device->request_queue->rq_timeout, 1387 MAX_WRITE_RETRIES, 1); 1388 if (!SRpnt) { 1389 result = (STp->buffer)->syscall_result; 1390 goto out; 1391 } 1392 1393 if (STp->buffer->syscall_result == 0 || 1394 (cmdstatp->have_sense && !cmdstatp->deferred && 1395 (cmdstatp->flags & SENSE_EOM) && 1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1399 /* Write successful at EOM */ 1400 st_release_request(SRpnt); 1401 SRpnt = NULL; 1402 if (STps->drv_file >= 0) 1403 STps->drv_file++; 1404 STps->drv_block = 0; 1405 if (STp->two_fm) 1406 cross_eof(STp, 0); 1407 STps->eof = ST_FM; 1408 } 1409 else { /* Write error */ 1410 st_release_request(SRpnt); 1411 SRpnt = NULL; 1412 st_printk(KERN_ERR, STp, 1413 "Error on write filemark.\n"); 1414 if (result == 0) 1415 result = (-EIO); 1416 } 1417 1418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1419 } else if (!STp->rew_at_close) { 1420 STps = &(STp->ps[STp->partition]); 1421 if (!STm->sysv || STps->rw != ST_READING) { 1422 if (STp->can_bsr) 1423 result = flush_buffer(STp, 0); 1424 else if (STps->eof == ST_FM_HIT) { 1425 result = cross_eof(STp, 0); 1426 if (result) { 1427 if (STps->drv_file >= 0) 1428 STps->drv_file++; 1429 STps->drv_block = 0; 1430 STps->eof = ST_FM; 1431 } else 1432 STps->eof = ST_NOEOF; 1433 } 1434 } else if ((STps->eof == ST_NOEOF && 1435 !(result = cross_eof(STp, 1))) || 1436 STps->eof == ST_FM_HIT) { 1437 if (STps->drv_file >= 0) 1438 STps->drv_file++; 1439 STps->drv_block = 0; 1440 STps->eof = ST_FM; 1441 } 1442 } 1443 1444 out: 1445 if (STp->rew_at_close) { 1446 result2 = st_int_ioctl(STp, MTREW, 1); 1447 if (result == 0) 1448 result = result2; 1449 } 1450 return result; 1451 } 1452 1453 1454 /* Close the device and release it. BKL is not needed: this is the only thread 1455 accessing this tape. */ 1456 static int st_release(struct inode *inode, struct file *filp) 1457 { 1458 int result = 0; 1459 struct scsi_tape *STp = filp->private_data; 1460 1461 if (STp->door_locked == ST_LOCKED_AUTO) 1462 do_door_lock(STp, 0); 1463 1464 normalize_buffer(STp->buffer); 1465 spin_lock(&st_use_lock); 1466 STp->in_use = 0; 1467 spin_unlock(&st_use_lock); 1468 scsi_autopm_put_device(STp->device); 1469 scsi_tape_put(STp); 1470 1471 return result; 1472 } 1473 1474 /* The checks common to both reading and writing */ 1475 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1476 { 1477 ssize_t retval = 0; 1478 1479 /* 1480 * If we are in the middle of error recovery, don't let anyone 1481 * else try and use this device. Also, if error recovery fails, it 1482 * may try and take the device offline, in which case all further 1483 * access to the device is prohibited. 1484 */ 1485 if (!scsi_block_when_processing_errors(STp->device)) { 1486 retval = (-ENXIO); 1487 goto out; 1488 } 1489 1490 if (STp->ready != ST_READY) { 1491 if (STp->ready == ST_NO_TAPE) 1492 retval = (-ENOMEDIUM); 1493 else 1494 retval = (-EIO); 1495 goto out; 1496 } 1497 1498 if (! STp->modes[STp->current_mode].defined) { 1499 retval = (-ENXIO); 1500 goto out; 1501 } 1502 1503 1504 /* 1505 * If there was a bus reset, block further access 1506 * to this device. 1507 */ 1508 if (STp->pos_unknown) { 1509 retval = (-EIO); 1510 goto out; 1511 } 1512 1513 if (count == 0) 1514 goto out; 1515 1516 DEB( 1517 if (!STp->in_use) { 1518 st_printk(ST_DEB_MSG, STp, 1519 "Incorrect device.\n"); 1520 retval = (-EIO); 1521 goto out; 1522 } ) /* end DEB */ 1523 1524 if (STp->can_partitions && 1525 (retval = switch_partition(STp)) < 0) 1526 goto out; 1527 1528 if (STp->block_size == 0 && STp->max_block > 0 && 1529 (count < STp->min_block || count > STp->max_block)) { 1530 retval = (-EINVAL); 1531 goto out; 1532 } 1533 1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1535 !do_door_lock(STp, 1)) 1536 STp->door_locked = ST_LOCKED_AUTO; 1537 1538 out: 1539 return retval; 1540 } 1541 1542 1543 static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1544 size_t count, int is_read) 1545 { 1546 int i, bufsize, retval = 0; 1547 struct st_buffer *STbp = STp->buffer; 1548 1549 if (is_read) 1550 i = STp->try_dio_now && try_rdio; 1551 else 1552 i = STp->try_dio_now && try_wdio; 1553 1554 if (i && ((unsigned long)buf & queue_dma_alignment( 1555 STp->device->request_queue)) == 0) { 1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1557 count, (is_read ? READ : WRITE)); 1558 if (i > 0) { 1559 STbp->do_dio = i; 1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1561 } 1562 else 1563 STbp->do_dio = 0; /* fall back to buffering with any error */ 1564 STbp->sg_segs = STbp->do_dio; 1565 DEB( 1566 if (STbp->do_dio) { 1567 STp->nbr_dio++; 1568 STp->nbr_pages += STbp->do_dio; 1569 } 1570 ) 1571 } else 1572 STbp->do_dio = 0; 1573 DEB( STp->nbr_requests++; ) 1574 1575 if (!STbp->do_dio) { 1576 if (STp->block_size) 1577 bufsize = STp->block_size > st_fixed_buffer_size ? 1578 STp->block_size : st_fixed_buffer_size; 1579 else { 1580 bufsize = count; 1581 /* Make sure that data from previous user is not leaked even if 1582 HBA does not return correct residual */ 1583 if (is_read && STp->sili && !STbp->cleared) 1584 clear_buffer(STbp); 1585 } 1586 1587 if (bufsize > STbp->buffer_size && 1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { 1589 st_printk(KERN_WARNING, STp, 1590 "Can't allocate %d byte tape buffer.\n", 1591 bufsize); 1592 retval = (-EOVERFLOW); 1593 goto out; 1594 } 1595 if (STp->block_size) 1596 STbp->buffer_blocks = bufsize / STp->block_size; 1597 } 1598 1599 out: 1600 return retval; 1601 } 1602 1603 1604 /* Can be called more than once after each setup_buffer() */ 1605 static void release_buffering(struct scsi_tape *STp, int is_read) 1606 { 1607 struct st_buffer *STbp; 1608 1609 STbp = STp->buffer; 1610 if (STbp->do_dio) { 1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1612 STbp->do_dio = 0; 1613 STbp->sg_segs = 0; 1614 } 1615 } 1616 1617 1618 /* Write command */ 1619 static ssize_t 1620 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1621 { 1622 ssize_t total; 1623 ssize_t i, do_count, blks, transfer; 1624 ssize_t retval; 1625 int undone, retry_eot = 0, scode; 1626 int async_write; 1627 unsigned char cmd[MAX_COMMAND_SIZE]; 1628 const char __user *b_point; 1629 struct st_request *SRpnt = NULL; 1630 struct scsi_tape *STp = filp->private_data; 1631 struct st_modedef *STm; 1632 struct st_partstat *STps; 1633 struct st_buffer *STbp; 1634 1635 if (mutex_lock_interruptible(&STp->lock)) 1636 return -ERESTARTSYS; 1637 1638 retval = rw_checks(STp, filp, count); 1639 if (retval || count == 0) 1640 goto out; 1641 1642 /* Write must be integral number of blocks */ 1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1644 st_printk(KERN_WARNING, STp, 1645 "Write not multiple of tape block size.\n"); 1646 retval = (-EINVAL); 1647 goto out; 1648 } 1649 1650 STm = &(STp->modes[STp->current_mode]); 1651 STps = &(STp->ps[STp->partition]); 1652 1653 if (STp->write_prot) { 1654 retval = (-EACCES); 1655 goto out; 1656 } 1657 1658 1659 if (STps->rw == ST_READING) { 1660 retval = flush_buffer(STp, 0); 1661 if (retval) 1662 goto out; 1663 STps->rw = ST_WRITING; 1664 } else if (STps->rw != ST_WRITING && 1665 STps->drv_file == 0 && STps->drv_block == 0) { 1666 if ((retval = set_mode_densblk(STp, STm)) < 0) 1667 goto out; 1668 if (STm->default_compression != ST_DONT_TOUCH && 1669 !(STp->compression_changed)) { 1670 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1671 st_printk(KERN_WARNING, STp, 1672 "Can't set default compression.\n"); 1673 if (modes_defined) { 1674 retval = (-EINVAL); 1675 goto out; 1676 } 1677 } 1678 } 1679 } 1680 1681 STbp = STp->buffer; 1682 i = write_behind_check(STp); 1683 if (i) { 1684 if (i == -ENOSPC) 1685 STps->eof = ST_EOM_OK; 1686 else 1687 STps->eof = ST_EOM_ERROR; 1688 } 1689 1690 if (STps->eof == ST_EOM_OK) { 1691 STps->eof = ST_EOD_1; /* allow next write */ 1692 retval = (-ENOSPC); 1693 goto out; 1694 } 1695 else if (STps->eof == ST_EOM_ERROR) { 1696 retval = (-EIO); 1697 goto out; 1698 } 1699 1700 /* Check the buffer readability in cases where copy_user might catch 1701 the problems after some tape movement. */ 1702 if (STp->block_size != 0 && 1703 !STbp->do_dio && 1704 (copy_from_user(&i, buf, 1) != 0 || 1705 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1706 retval = (-EFAULT); 1707 goto out; 1708 } 1709 1710 retval = setup_buffering(STp, buf, count, 0); 1711 if (retval) 1712 goto out; 1713 1714 total = count; 1715 1716 memset(cmd, 0, MAX_COMMAND_SIZE); 1717 cmd[0] = WRITE_6; 1718 cmd[1] = (STp->block_size != 0); 1719 1720 STps->rw = ST_WRITING; 1721 1722 b_point = buf; 1723 while (count > 0 && !retry_eot) { 1724 1725 if (STbp->do_dio) { 1726 do_count = count; 1727 } 1728 else { 1729 if (STp->block_size == 0) 1730 do_count = count; 1731 else { 1732 do_count = STbp->buffer_blocks * STp->block_size - 1733 STbp->buffer_bytes; 1734 if (do_count > count) 1735 do_count = count; 1736 } 1737 1738 i = append_to_buffer(b_point, STbp, do_count); 1739 if (i) { 1740 retval = i; 1741 goto out; 1742 } 1743 } 1744 count -= do_count; 1745 b_point += do_count; 1746 1747 async_write = STp->block_size == 0 && !STbp->do_dio && 1748 STm->do_async_writes && STps->eof < ST_EOM_OK; 1749 1750 if (STp->block_size != 0 && STm->do_buffer_writes && 1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1752 STbp->buffer_bytes < STbp->buffer_size) { 1753 STp->dirty = 1; 1754 /* Don't write a buffer that is not full enough. */ 1755 if (!async_write && count == 0) 1756 break; 1757 } 1758 1759 retry_write: 1760 if (STp->block_size == 0) 1761 blks = transfer = do_count; 1762 else { 1763 if (!STbp->do_dio) 1764 blks = STbp->buffer_bytes; 1765 else 1766 blks = do_count; 1767 blks /= STp->block_size; 1768 transfer = blks * STp->block_size; 1769 } 1770 cmd[2] = blks >> 16; 1771 cmd[3] = blks >> 8; 1772 cmd[4] = blks; 1773 1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1775 STp->device->request_queue->rq_timeout, 1776 MAX_WRITE_RETRIES, !async_write); 1777 if (!SRpnt) { 1778 retval = STbp->syscall_result; 1779 goto out; 1780 } 1781 if (async_write && !STbp->syscall_result) { 1782 STbp->writing = transfer; 1783 STp->dirty = !(STbp->writing == 1784 STbp->buffer_bytes); 1785 SRpnt = NULL; /* Prevent releasing this request! */ 1786 DEB( STp->write_pending = 1; ) 1787 break; 1788 } 1789 1790 if (STbp->syscall_result != 0) { 1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1792 1793 DEBC_printk(STp, "Error on write:\n"); 1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1795 scode = cmdstatp->sense_hdr.sense_key; 1796 if (cmdstatp->remainder_valid) 1797 undone = (int)cmdstatp->uremainder64; 1798 else if (STp->block_size == 0 && 1799 scode == VOLUME_OVERFLOW) 1800 undone = transfer; 1801 else 1802 undone = 0; 1803 if (STp->block_size != 0) 1804 undone *= STp->block_size; 1805 if (undone <= do_count) { 1806 /* Only data from this write is not written */ 1807 count += undone; 1808 b_point -= undone; 1809 do_count -= undone; 1810 if (STp->block_size) 1811 blks = (transfer - undone) / STp->block_size; 1812 STps->eof = ST_EOM_OK; 1813 /* Continue in fixed block mode if all written 1814 in this request but still something left to write 1815 (retval left to zero) 1816 */ 1817 if (STp->block_size == 0 || 1818 undone > 0 || count == 0) 1819 retval = (-ENOSPC); /* EOM within current request */ 1820 DEBC_printk(STp, "EOM with %d " 1821 "bytes unwritten.\n", 1822 (int)count); 1823 } else { 1824 /* EOT within data buffered earlier (possible only 1825 in fixed block mode without direct i/o) */ 1826 if (!retry_eot && !cmdstatp->deferred && 1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1828 move_buffer_data(STp->buffer, transfer - undone); 1829 retry_eot = 1; 1830 if (STps->drv_block >= 0) { 1831 STps->drv_block += (transfer - undone) / 1832 STp->block_size; 1833 } 1834 STps->eof = ST_EOM_OK; 1835 DEBC_printk(STp, "Retry " 1836 "write of %d " 1837 "bytes at EOM.\n", 1838 STp->buffer->buffer_bytes); 1839 goto retry_write; 1840 } 1841 else { 1842 /* Either error within data buffered by driver or 1843 failed retry */ 1844 count -= do_count; 1845 blks = do_count = 0; 1846 STps->eof = ST_EOM_ERROR; 1847 STps->drv_block = (-1); /* Too cautious? */ 1848 retval = (-EIO); /* EOM for old data */ 1849 DEBC_printk(STp, "EOM with " 1850 "lost data.\n"); 1851 } 1852 } 1853 } else { 1854 count += do_count; 1855 STps->drv_block = (-1); /* Too cautious? */ 1856 retval = STbp->syscall_result; 1857 } 1858 1859 } 1860 1861 if (STps->drv_block >= 0) { 1862 if (STp->block_size == 0) 1863 STps->drv_block += (do_count > 0); 1864 else 1865 STps->drv_block += blks; 1866 } 1867 1868 STbp->buffer_bytes = 0; 1869 STp->dirty = 0; 1870 1871 if (retval || retry_eot) { 1872 if (count < total) 1873 retval = total - count; 1874 goto out; 1875 } 1876 } 1877 1878 if (STps->eof == ST_EOD_1) 1879 STps->eof = ST_EOM_OK; 1880 else if (STps->eof != ST_EOM_OK) 1881 STps->eof = ST_NOEOF; 1882 retval = total - count; 1883 1884 out: 1885 if (SRpnt != NULL) 1886 st_release_request(SRpnt); 1887 release_buffering(STp, 0); 1888 mutex_unlock(&STp->lock); 1889 1890 return retval; 1891 } 1892 1893 /* Read data from the tape. Returns zero in the normal case, one if the 1894 eof status has changed, and the negative error code in case of a 1895 fatal error. Otherwise updates the buffer and the eof state. 1896 1897 Does release user buffer mapping if it is set. 1898 */ 1899 static long read_tape(struct scsi_tape *STp, long count, 1900 struct st_request ** aSRpnt) 1901 { 1902 int transfer, blks, bytes; 1903 unsigned char cmd[MAX_COMMAND_SIZE]; 1904 struct st_request *SRpnt; 1905 struct st_modedef *STm; 1906 struct st_partstat *STps; 1907 struct st_buffer *STbp; 1908 int retval = 0; 1909 1910 if (count == 0) 1911 return 0; 1912 1913 STm = &(STp->modes[STp->current_mode]); 1914 STps = &(STp->ps[STp->partition]); 1915 if (STps->eof == ST_FM_HIT) 1916 return 1; 1917 STbp = STp->buffer; 1918 1919 if (STp->block_size == 0) 1920 blks = bytes = count; 1921 else { 1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1923 blks = (STp->buffer)->buffer_blocks; 1924 bytes = blks * STp->block_size; 1925 } else { 1926 bytes = count; 1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1928 bytes = (STp->buffer)->buffer_size; 1929 blks = bytes / STp->block_size; 1930 bytes = blks * STp->block_size; 1931 } 1932 } 1933 1934 memset(cmd, 0, MAX_COMMAND_SIZE); 1935 cmd[0] = READ_6; 1936 cmd[1] = (STp->block_size != 0); 1937 if (!cmd[1] && STp->sili) 1938 cmd[1] |= 2; 1939 cmd[2] = blks >> 16; 1940 cmd[3] = blks >> 8; 1941 cmd[4] = blks; 1942 1943 SRpnt = *aSRpnt; 1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1945 STp->device->request_queue->rq_timeout, 1946 MAX_RETRIES, 1); 1947 release_buffering(STp, 1); 1948 *aSRpnt = SRpnt; 1949 if (!SRpnt) 1950 return STbp->syscall_result; 1951 1952 STbp->read_pointer = 0; 1953 STps->at_sm = 0; 1954 1955 /* Something to check */ 1956 if (STbp->syscall_result) { 1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1958 1959 retval = 1; 1960 DEBC_printk(STp, 1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1962 SRpnt->sense[0], SRpnt->sense[1], 1963 SRpnt->sense[2], SRpnt->sense[3], 1964 SRpnt->sense[4], SRpnt->sense[5], 1965 SRpnt->sense[6], SRpnt->sense[7]); 1966 if (cmdstatp->have_sense) { 1967 1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1970 1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1972 /* Compute the residual count */ 1973 if (cmdstatp->remainder_valid) 1974 transfer = (int)cmdstatp->uremainder64; 1975 else 1976 transfer = 0; 1977 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) { 1978 if (STp->block_size == 0) 1979 transfer = bytes; 1980 /* Some drives set ILI with MEDIUM ERROR */ 1981 cmdstatp->flags &= ~SENSE_ILI; 1982 } 1983 1984 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1985 if (STp->block_size == 0 && 1986 transfer < 0) { 1987 st_printk(KERN_NOTICE, STp, 1988 "Failed to read %d " 1989 "byte block with %d " 1990 "byte transfer.\n", 1991 bytes - transfer, 1992 bytes); 1993 if (STps->drv_block >= 0) 1994 STps->drv_block += 1; 1995 STbp->buffer_bytes = 0; 1996 return (-ENOMEM); 1997 } else if (STp->block_size == 0) { 1998 STbp->buffer_bytes = bytes - transfer; 1999 } else { 2000 st_release_request(SRpnt); 2001 SRpnt = *aSRpnt = NULL; 2002 if (transfer == blks) { /* We did not get anything, error */ 2003 st_printk(KERN_NOTICE, STp, 2004 "Incorrect " 2005 "block size.\n"); 2006 if (STps->drv_block >= 0) 2007 STps->drv_block += blks - transfer + 1; 2008 st_int_ioctl(STp, MTBSR, 1); 2009 return (-EIO); 2010 } 2011 /* We have some data, deliver it */ 2012 STbp->buffer_bytes = (blks - transfer) * 2013 STp->block_size; 2014 DEBC_printk(STp, "ILI but " 2015 "enough data " 2016 "received %ld " 2017 "%d.\n", count, 2018 STbp->buffer_bytes); 2019 if (STps->drv_block >= 0) 2020 STps->drv_block += 1; 2021 if (st_int_ioctl(STp, MTBSR, 1)) 2022 return (-EIO); 2023 } 2024 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 2025 if (STps->eof != ST_FM_HIT) 2026 STps->eof = ST_FM_HIT; 2027 else 2028 STps->eof = ST_EOD_2; 2029 if (STp->block_size == 0) 2030 STbp->buffer_bytes = 0; 2031 else 2032 STbp->buffer_bytes = 2033 bytes - transfer * STp->block_size; 2034 DEBC_printk(STp, "EOF detected (%d " 2035 "bytes read).\n", 2036 STbp->buffer_bytes); 2037 } else if (cmdstatp->flags & SENSE_EOM) { 2038 if (STps->eof == ST_FM) 2039 STps->eof = ST_EOD_1; 2040 else 2041 STps->eof = ST_EOM_OK; 2042 if (STp->block_size == 0) 2043 STbp->buffer_bytes = bytes - transfer; 2044 else 2045 STbp->buffer_bytes = 2046 bytes - transfer * STp->block_size; 2047 2048 DEBC_printk(STp, "EOM detected (%d " 2049 "bytes read).\n", 2050 STbp->buffer_bytes); 2051 } 2052 } 2053 /* end of EOF, EOM, ILI test */ 2054 else { /* nonzero sense key */ 2055 DEBC_printk(STp, "Tape error while reading.\n"); 2056 STps->drv_block = (-1); 2057 if (STps->eof == ST_FM && 2058 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 2059 DEBC_printk(STp, "Zero returned for " 2060 "first BLANK CHECK " 2061 "after EOF.\n"); 2062 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 2063 } else /* Some other extended sense code */ 2064 retval = (-EIO); 2065 } 2066 2067 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 2068 STbp->buffer_bytes = 0; 2069 } 2070 /* End of extended sense test */ 2071 else { /* Non-extended sense */ 2072 retval = STbp->syscall_result; 2073 } 2074 2075 } 2076 /* End of error handling */ 2077 else { /* Read successful */ 2078 STbp->buffer_bytes = bytes; 2079 if (STp->sili) /* In fixed block mode residual is always zero here */ 2080 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2081 } 2082 2083 if (STps->drv_block >= 0) { 2084 if (STp->block_size == 0) 2085 STps->drv_block++; 2086 else 2087 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2088 } 2089 return retval; 2090 } 2091 2092 2093 /* Read command */ 2094 static ssize_t 2095 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2096 { 2097 ssize_t total; 2098 ssize_t retval = 0; 2099 ssize_t i, transfer; 2100 int special, do_dio = 0; 2101 struct st_request *SRpnt = NULL; 2102 struct scsi_tape *STp = filp->private_data; 2103 struct st_modedef *STm; 2104 struct st_partstat *STps; 2105 struct st_buffer *STbp = STp->buffer; 2106 2107 if (mutex_lock_interruptible(&STp->lock)) 2108 return -ERESTARTSYS; 2109 2110 retval = rw_checks(STp, filp, count); 2111 if (retval || count == 0) 2112 goto out; 2113 2114 STm = &(STp->modes[STp->current_mode]); 2115 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2116 if (!STm->do_read_ahead) { 2117 retval = (-EINVAL); /* Read must be integral number of blocks */ 2118 goto out; 2119 } 2120 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2121 } 2122 2123 STps = &(STp->ps[STp->partition]); 2124 if (STps->rw == ST_WRITING) { 2125 retval = flush_buffer(STp, 0); 2126 if (retval) 2127 goto out; 2128 STps->rw = ST_READING; 2129 } 2130 DEB( 2131 if (debugging && STps->eof != ST_NOEOF) 2132 st_printk(ST_DEB_MSG, STp, 2133 "EOF/EOM flag up (%d). Bytes %d\n", 2134 STps->eof, STbp->buffer_bytes); 2135 ) /* end DEB */ 2136 2137 retval = setup_buffering(STp, buf, count, 1); 2138 if (retval) 2139 goto out; 2140 do_dio = STbp->do_dio; 2141 2142 if (STbp->buffer_bytes == 0 && 2143 STps->eof >= ST_EOD_1) { 2144 if (STps->eof < ST_EOD) { 2145 STps->eof += 1; 2146 retval = 0; 2147 goto out; 2148 } 2149 retval = (-EIO); /* EOM or Blank Check */ 2150 goto out; 2151 } 2152 2153 if (do_dio) { 2154 /* Check the buffer writability before any tape movement. Don't alter 2155 buffer data. */ 2156 if (copy_from_user(&i, buf, 1) != 0 || 2157 copy_to_user(buf, &i, 1) != 0 || 2158 copy_from_user(&i, buf + count - 1, 1) != 0 || 2159 copy_to_user(buf + count - 1, &i, 1) != 0) { 2160 retval = (-EFAULT); 2161 goto out; 2162 } 2163 } 2164 2165 STps->rw = ST_READING; 2166 2167 2168 /* Loop until enough data in buffer or a special condition found */ 2169 for (total = 0, special = 0; total < count && !special;) { 2170 2171 /* Get new data if the buffer is empty */ 2172 if (STbp->buffer_bytes == 0) { 2173 special = read_tape(STp, count - total, &SRpnt); 2174 if (special < 0) { /* No need to continue read */ 2175 retval = special; 2176 goto out; 2177 } 2178 } 2179 2180 /* Move the data from driver buffer to user buffer */ 2181 if (STbp->buffer_bytes > 0) { 2182 DEB( 2183 if (debugging && STps->eof != ST_NOEOF) 2184 st_printk(ST_DEB_MSG, STp, 2185 "EOF up (%d). Left %d, needed %d.\n", 2186 STps->eof, STbp->buffer_bytes, 2187 (int)(count - total)); 2188 ) /* end DEB */ 2189 transfer = STbp->buffer_bytes < count - total ? 2190 STbp->buffer_bytes : count - total; 2191 if (!do_dio) { 2192 i = from_buffer(STbp, buf, transfer); 2193 if (i) { 2194 retval = i; 2195 goto out; 2196 } 2197 } 2198 buf += transfer; 2199 total += transfer; 2200 } 2201 2202 if (STp->block_size == 0) 2203 break; /* Read only one variable length block */ 2204 2205 } /* for (total = 0, special = 0; 2206 total < count && !special; ) */ 2207 2208 /* Change the eof state if no data from tape or buffer */ 2209 if (total == 0) { 2210 if (STps->eof == ST_FM_HIT) { 2211 STps->eof = ST_FM; 2212 STps->drv_block = 0; 2213 if (STps->drv_file >= 0) 2214 STps->drv_file++; 2215 } else if (STps->eof == ST_EOD_1) { 2216 STps->eof = ST_EOD_2; 2217 STps->drv_block = 0; 2218 if (STps->drv_file >= 0) 2219 STps->drv_file++; 2220 } else if (STps->eof == ST_EOD_2) 2221 STps->eof = ST_EOD; 2222 } else if (STps->eof == ST_FM) 2223 STps->eof = ST_NOEOF; 2224 retval = total; 2225 2226 out: 2227 if (SRpnt != NULL) { 2228 st_release_request(SRpnt); 2229 SRpnt = NULL; 2230 } 2231 if (do_dio) { 2232 release_buffering(STp, 1); 2233 STbp->buffer_bytes = 0; 2234 } 2235 mutex_unlock(&STp->lock); 2236 2237 return retval; 2238 } 2239 2240 2241 2242 DEB( 2243 /* Set the driver options */ 2244 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) 2245 { 2246 if (debugging) { 2247 st_printk(KERN_INFO, STp, 2248 "Mode %d options: buffer writes: %d, " 2249 "async writes: %d, read ahead: %d\n", 2250 STp->current_mode, STm->do_buffer_writes, 2251 STm->do_async_writes, STm->do_read_ahead); 2252 st_printk(KERN_INFO, STp, 2253 " can bsr: %d, two FMs: %d, " 2254 "fast mteom: %d, auto lock: %d,\n", 2255 STp->can_bsr, STp->two_fm, STp->fast_mteom, 2256 STp->do_auto_lock); 2257 st_printk(KERN_INFO, STp, 2258 " defs for wr: %d, no block limits: %d, " 2259 "partitions: %d, s2 log: %d\n", 2260 STm->defaults_for_writes, STp->omit_blklims, 2261 STp->can_partitions, STp->scsi2_logical); 2262 st_printk(KERN_INFO, STp, 2263 " sysv: %d nowait: %d sili: %d " 2264 "nowait_filemark: %d\n", 2265 STm->sysv, STp->immediate, STp->sili, 2266 STp->immediate_filemark); 2267 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); 2268 } 2269 } 2270 ) 2271 2272 2273 static int st_set_options(struct scsi_tape *STp, long options) 2274 { 2275 int value; 2276 long code; 2277 struct st_modedef *STm; 2278 struct cdev *cd0, *cd1; 2279 struct device *d0, *d1; 2280 2281 STm = &(STp->modes[STp->current_mode]); 2282 if (!STm->defined) { 2283 cd0 = STm->cdevs[0]; 2284 cd1 = STm->cdevs[1]; 2285 d0 = STm->devs[0]; 2286 d1 = STm->devs[1]; 2287 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2288 STm->cdevs[0] = cd0; 2289 STm->cdevs[1] = cd1; 2290 STm->devs[0] = d0; 2291 STm->devs[1] = d1; 2292 modes_defined = 1; 2293 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", 2294 STp->current_mode); 2295 } 2296 2297 code = options & MT_ST_OPTIONS; 2298 if (code == MT_ST_BOOLEANS) { 2299 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2300 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2301 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2302 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2303 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2304 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2305 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2306 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2307 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2308 if ((STp->device)->scsi_level >= SCSI_2) 2309 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2310 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2311 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2312 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2313 STm->sysv = (options & MT_ST_SYSV) != 0; 2314 STp->sili = (options & MT_ST_SILI) != 0; 2315 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2316 st_log_options(STp, STm); ) 2317 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2318 value = (code == MT_ST_SETBOOLEANS); 2319 if ((options & MT_ST_BUFFER_WRITES) != 0) 2320 STm->do_buffer_writes = value; 2321 if ((options & MT_ST_ASYNC_WRITES) != 0) 2322 STm->do_async_writes = value; 2323 if ((options & MT_ST_DEF_WRITES) != 0) 2324 STm->defaults_for_writes = value; 2325 if ((options & MT_ST_READ_AHEAD) != 0) 2326 STm->do_read_ahead = value; 2327 if ((options & MT_ST_TWO_FM) != 0) 2328 STp->two_fm = value; 2329 if ((options & MT_ST_FAST_MTEOM) != 0) 2330 STp->fast_mteom = value; 2331 if ((options & MT_ST_AUTO_LOCK) != 0) 2332 STp->do_auto_lock = value; 2333 if ((options & MT_ST_CAN_BSR) != 0) 2334 STp->can_bsr = value; 2335 if ((options & MT_ST_NO_BLKLIMS) != 0) 2336 STp->omit_blklims = value; 2337 if ((STp->device)->scsi_level >= SCSI_2 && 2338 (options & MT_ST_CAN_PARTITIONS) != 0) 2339 STp->can_partitions = value; 2340 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2341 STp->scsi2_logical = value; 2342 if ((options & MT_ST_NOWAIT) != 0) 2343 STp->immediate = value; 2344 if ((options & MT_ST_NOWAIT_EOF) != 0) 2345 STp->immediate_filemark = value; 2346 if ((options & MT_ST_SYSV) != 0) 2347 STm->sysv = value; 2348 if ((options & MT_ST_SILI) != 0) 2349 STp->sili = value; 2350 DEB( 2351 if ((options & MT_ST_DEBUGGING) != 0) 2352 debugging = value; 2353 st_log_options(STp, STm); ) 2354 } else if (code == MT_ST_WRITE_THRESHOLD) { 2355 /* Retained for compatibility */ 2356 } else if (code == MT_ST_DEF_BLKSIZE) { 2357 value = (options & ~MT_ST_OPTIONS); 2358 if (value == ~MT_ST_OPTIONS) { 2359 STm->default_blksize = (-1); 2360 DEBC_printk(STp, "Default block size disabled.\n"); 2361 } else { 2362 STm->default_blksize = value; 2363 DEBC_printk(STp,"Default block size set to " 2364 "%d bytes.\n", STm->default_blksize); 2365 if (STp->ready == ST_READY) { 2366 STp->blksize_changed = 0; 2367 set_mode_densblk(STp, STm); 2368 } 2369 } 2370 } else if (code == MT_ST_TIMEOUTS) { 2371 value = (options & ~MT_ST_OPTIONS); 2372 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2373 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2374 DEBC_printk(STp, "Long timeout set to %d seconds.\n", 2375 (value & ~MT_ST_SET_LONG_TIMEOUT)); 2376 } else { 2377 blk_queue_rq_timeout(STp->device->request_queue, 2378 value * HZ); 2379 DEBC_printk(STp, "Normal timeout set to %d seconds.\n", 2380 value); 2381 } 2382 } else if (code == MT_ST_SET_CLN) { 2383 value = (options & ~MT_ST_OPTIONS) & 0xff; 2384 if (value != 0 && 2385 (value < EXTENDED_SENSE_START || 2386 value >= SCSI_SENSE_BUFFERSIZE)) 2387 return (-EINVAL); 2388 STp->cln_mode = value; 2389 STp->cln_sense_mask = (options >> 8) & 0xff; 2390 STp->cln_sense_value = (options >> 16) & 0xff; 2391 st_printk(KERN_INFO, STp, 2392 "Cleaning request mode %d, mask %02x, value %02x\n", 2393 value, STp->cln_sense_mask, STp->cln_sense_value); 2394 } else if (code == MT_ST_DEF_OPTIONS) { 2395 code = (options & ~MT_ST_CLEAR_DEFAULT); 2396 value = (options & MT_ST_CLEAR_DEFAULT); 2397 if (code == MT_ST_DEF_DENSITY) { 2398 if (value == MT_ST_CLEAR_DEFAULT) { 2399 STm->default_density = (-1); 2400 DEBC_printk(STp, 2401 "Density default disabled.\n"); 2402 } else { 2403 STm->default_density = value & 0xff; 2404 DEBC_printk(STp, "Density default set to %x\n", 2405 STm->default_density); 2406 if (STp->ready == ST_READY) { 2407 STp->density_changed = 0; 2408 set_mode_densblk(STp, STm); 2409 } 2410 } 2411 } else if (code == MT_ST_DEF_DRVBUFFER) { 2412 if (value == MT_ST_CLEAR_DEFAULT) { 2413 STp->default_drvbuffer = 0xff; 2414 DEBC_printk(STp, 2415 "Drive buffer default disabled.\n"); 2416 } else { 2417 STp->default_drvbuffer = value & 7; 2418 DEBC_printk(STp, 2419 "Drive buffer default set to %x\n", 2420 STp->default_drvbuffer); 2421 if (STp->ready == ST_READY) 2422 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2423 } 2424 } else if (code == MT_ST_DEF_COMPRESSION) { 2425 if (value == MT_ST_CLEAR_DEFAULT) { 2426 STm->default_compression = ST_DONT_TOUCH; 2427 DEBC_printk(STp, 2428 "Compression default disabled.\n"); 2429 } else { 2430 if ((value & 0xff00) != 0) { 2431 STp->c_algo = (value & 0xff00) >> 8; 2432 DEBC_printk(STp, "Compression " 2433 "algorithm set to 0x%x.\n", 2434 STp->c_algo); 2435 } 2436 if ((value & 0xff) != 0xff) { 2437 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2438 DEBC_printk(STp, "Compression default " 2439 "set to %x\n", 2440 (value & 1)); 2441 if (STp->ready == ST_READY) { 2442 STp->compression_changed = 0; 2443 st_compression(STp, (STm->default_compression == ST_YES)); 2444 } 2445 } 2446 } 2447 } 2448 } else 2449 return (-EIO); 2450 2451 return 0; 2452 } 2453 2454 #define MODE_HEADER_LENGTH 4 2455 2456 /* Mode header and page byte offsets */ 2457 #define MH_OFF_DATA_LENGTH 0 2458 #define MH_OFF_MEDIUM_TYPE 1 2459 #define MH_OFF_DEV_SPECIFIC 2 2460 #define MH_OFF_BDESCS_LENGTH 3 2461 #define MP_OFF_PAGE_NBR 0 2462 #define MP_OFF_PAGE_LENGTH 1 2463 2464 /* Mode header and page bit masks */ 2465 #define MH_BIT_WP 0x80 2466 #define MP_MSK_PAGE_NBR 0x3f 2467 2468 /* Don't return block descriptors */ 2469 #define MODE_SENSE_OMIT_BDESCS 0x08 2470 2471 #define MODE_SELECT_PAGE_FORMAT 0x10 2472 2473 /* Read a mode page into the tape buffer. The block descriptors are included 2474 if incl_block_descs is true. The page control is ored to the page number 2475 parameter, if necessary. */ 2476 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2477 { 2478 unsigned char cmd[MAX_COMMAND_SIZE]; 2479 struct st_request *SRpnt; 2480 2481 memset(cmd, 0, MAX_COMMAND_SIZE); 2482 cmd[0] = MODE_SENSE; 2483 if (omit_block_descs) 2484 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2485 cmd[2] = page; 2486 cmd[4] = 255; 2487 2488 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2489 STp->device->request_queue->rq_timeout, 0, 1); 2490 if (SRpnt == NULL) 2491 return (STp->buffer)->syscall_result; 2492 2493 st_release_request(SRpnt); 2494 2495 return STp->buffer->syscall_result; 2496 } 2497 2498 2499 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2500 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2501 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2502 { 2503 int pgo; 2504 unsigned char cmd[MAX_COMMAND_SIZE]; 2505 struct st_request *SRpnt; 2506 int timeout; 2507 2508 memset(cmd, 0, MAX_COMMAND_SIZE); 2509 cmd[0] = MODE_SELECT; 2510 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2511 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2512 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2513 2514 /* Clear reserved fields */ 2515 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2516 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2517 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2518 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2519 2520 timeout = slow ? 2521 STp->long_timeout : STp->device->request_queue->rq_timeout; 2522 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2523 timeout, 0, 1); 2524 if (SRpnt == NULL) 2525 return (STp->buffer)->syscall_result; 2526 2527 st_release_request(SRpnt); 2528 2529 return STp->buffer->syscall_result; 2530 } 2531 2532 2533 #define COMPRESSION_PAGE 0x0f 2534 #define COMPRESSION_PAGE_LENGTH 16 2535 2536 #define CP_OFF_DCE_DCC 2 2537 #define CP_OFF_C_ALGO 7 2538 2539 #define DCE_MASK 0x80 2540 #define DCC_MASK 0x40 2541 #define RED_MASK 0x60 2542 2543 2544 /* Control the compression with mode page 15. Algorithm not changed if zero. 2545 2546 The block descriptors are read and written because Sony SDT-7000 does not 2547 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2548 Including block descriptors should not cause any harm to other drives. */ 2549 2550 static int st_compression(struct scsi_tape * STp, int state) 2551 { 2552 int retval; 2553 int mpoffs; /* Offset to mode page start */ 2554 unsigned char *b_data = (STp->buffer)->b_data; 2555 2556 if (STp->ready != ST_READY) 2557 return (-EIO); 2558 2559 /* Read the current page contents */ 2560 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2561 if (retval) { 2562 DEBC_printk(STp, "Compression mode page not supported.\n"); 2563 return (-EIO); 2564 } 2565 2566 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2567 DEBC_printk(STp, "Compression state is %d.\n", 2568 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); 2569 2570 /* Check if compression can be changed */ 2571 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2572 DEBC_printk(STp, "Compression not supported.\n"); 2573 return (-EIO); 2574 } 2575 2576 /* Do the change */ 2577 if (state) { 2578 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2579 if (STp->c_algo != 0) 2580 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2581 } 2582 else { 2583 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2584 if (STp->c_algo != 0) 2585 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2586 } 2587 2588 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2589 if (retval) { 2590 DEBC_printk(STp, "Compression change failed.\n"); 2591 return (-EIO); 2592 } 2593 DEBC_printk(STp, "Compression state changed to %d.\n", state); 2594 2595 STp->compression_changed = 1; 2596 return 0; 2597 } 2598 2599 2600 /* Process the load and unload commands (does unload if the load code is zero) */ 2601 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2602 { 2603 int retval = (-EIO), timeout; 2604 unsigned char cmd[MAX_COMMAND_SIZE]; 2605 struct st_partstat *STps; 2606 struct st_request *SRpnt; 2607 2608 if (STp->ready != ST_READY && !load_code) { 2609 if (STp->ready == ST_NO_TAPE) 2610 return (-ENOMEDIUM); 2611 else 2612 return (-EIO); 2613 } 2614 2615 memset(cmd, 0, MAX_COMMAND_SIZE); 2616 cmd[0] = START_STOP; 2617 if (load_code) 2618 cmd[4] |= 1; 2619 /* 2620 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2621 */ 2622 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2623 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2624 DEBC_printk(STp, " Enhanced %sload slot %2d.\n", 2625 (cmd[4]) ? "" : "un", 2626 load_code - MT_ST_HPLOADER_OFFSET); 2627 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2628 } 2629 if (STp->immediate) { 2630 cmd[1] = 1; /* Don't wait for completion */ 2631 timeout = STp->device->request_queue->rq_timeout; 2632 } 2633 else 2634 timeout = STp->long_timeout; 2635 2636 DEBC( 2637 if (!load_code) 2638 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); 2639 else 2640 st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); 2641 ); 2642 2643 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2644 timeout, MAX_RETRIES, 1); 2645 if (!SRpnt) 2646 return (STp->buffer)->syscall_result; 2647 2648 retval = (STp->buffer)->syscall_result; 2649 st_release_request(SRpnt); 2650 2651 if (!retval) { /* SCSI command successful */ 2652 2653 if (!load_code) { 2654 STp->rew_at_close = 0; 2655 STp->ready = ST_NO_TAPE; 2656 } 2657 else { 2658 STp->rew_at_close = STp->autorew_dev; 2659 retval = check_tape(STp, filp); 2660 if (retval > 0) 2661 retval = 0; 2662 } 2663 } 2664 else { 2665 STps = &(STp->ps[STp->partition]); 2666 STps->drv_file = STps->drv_block = (-1); 2667 } 2668 2669 return retval; 2670 } 2671 2672 #if DEBUG 2673 #define ST_DEB_FORWARD 0 2674 #define ST_DEB_BACKWARD 1 2675 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) 2676 { 2677 s32 sc; 2678 2679 if (!debugging) 2680 return; 2681 2682 sc = cmd[2] & 0x80 ? 0xff000000 : 0; 2683 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; 2684 if (direction) 2685 sc = -sc; 2686 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2687 direction ? "backward" : "forward", sc, units); 2688 } 2689 #else 2690 #define ST_DEB_FORWARD 0 2691 #define ST_DEB_BACKWARD 1 2692 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2693 #endif 2694 2695 2696 /* Internal ioctl function */ 2697 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2698 { 2699 int timeout; 2700 long ltmp; 2701 int ioctl_result; 2702 int chg_eof = 1; 2703 unsigned char cmd[MAX_COMMAND_SIZE]; 2704 struct st_request *SRpnt; 2705 struct st_partstat *STps; 2706 int fileno, blkno, at_sm, undone; 2707 int datalen = 0, direction = DMA_NONE; 2708 2709 WARN_ON(STp->buffer->do_dio != 0); 2710 if (STp->ready != ST_READY) { 2711 if (STp->ready == ST_NO_TAPE) 2712 return (-ENOMEDIUM); 2713 else 2714 return (-EIO); 2715 } 2716 timeout = STp->long_timeout; 2717 STps = &(STp->ps[STp->partition]); 2718 fileno = STps->drv_file; 2719 blkno = STps->drv_block; 2720 at_sm = STps->at_sm; 2721 2722 memset(cmd, 0, MAX_COMMAND_SIZE); 2723 switch (cmd_in) { 2724 case MTFSFM: 2725 chg_eof = 0; /* Changed from the FSF after this */ 2726 /* fall through */ 2727 case MTFSF: 2728 cmd[0] = SPACE; 2729 cmd[1] = 0x01; /* Space FileMarks */ 2730 cmd[2] = (arg >> 16); 2731 cmd[3] = (arg >> 8); 2732 cmd[4] = arg; 2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2734 if (fileno >= 0) 2735 fileno += arg; 2736 blkno = 0; 2737 at_sm &= (arg == 0); 2738 break; 2739 case MTBSFM: 2740 chg_eof = 0; /* Changed from the FSF after this */ 2741 /* fall through */ 2742 case MTBSF: 2743 cmd[0] = SPACE; 2744 cmd[1] = 0x01; /* Space FileMarks */ 2745 ltmp = (-arg); 2746 cmd[2] = (ltmp >> 16); 2747 cmd[3] = (ltmp >> 8); 2748 cmd[4] = ltmp; 2749 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2750 if (fileno >= 0) 2751 fileno -= arg; 2752 blkno = (-1); /* We can't know the block number */ 2753 at_sm &= (arg == 0); 2754 break; 2755 case MTFSR: 2756 cmd[0] = SPACE; 2757 cmd[1] = 0x00; /* Space Blocks */ 2758 cmd[2] = (arg >> 16); 2759 cmd[3] = (arg >> 8); 2760 cmd[4] = arg; 2761 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2762 if (blkno >= 0) 2763 blkno += arg; 2764 at_sm &= (arg == 0); 2765 break; 2766 case MTBSR: 2767 cmd[0] = SPACE; 2768 cmd[1] = 0x00; /* Space Blocks */ 2769 ltmp = (-arg); 2770 cmd[2] = (ltmp >> 16); 2771 cmd[3] = (ltmp >> 8); 2772 cmd[4] = ltmp; 2773 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2774 if (blkno >= 0) 2775 blkno -= arg; 2776 at_sm &= (arg == 0); 2777 break; 2778 case MTFSS: 2779 cmd[0] = SPACE; 2780 cmd[1] = 0x04; /* Space Setmarks */ 2781 cmd[2] = (arg >> 16); 2782 cmd[3] = (arg >> 8); 2783 cmd[4] = arg; 2784 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2785 if (arg != 0) { 2786 blkno = fileno = (-1); 2787 at_sm = 1; 2788 } 2789 break; 2790 case MTBSS: 2791 cmd[0] = SPACE; 2792 cmd[1] = 0x04; /* Space Setmarks */ 2793 ltmp = (-arg); 2794 cmd[2] = (ltmp >> 16); 2795 cmd[3] = (ltmp >> 8); 2796 cmd[4] = ltmp; 2797 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2798 if (arg != 0) { 2799 blkno = fileno = (-1); 2800 at_sm = 1; 2801 } 2802 break; 2803 case MTWEOF: 2804 case MTWEOFI: 2805 case MTWSM: 2806 if (STp->write_prot) 2807 return (-EACCES); 2808 cmd[0] = WRITE_FILEMARKS; 2809 if (cmd_in == MTWSM) 2810 cmd[1] = 2; 2811 if (cmd_in == MTWEOFI || 2812 (cmd_in == MTWEOF && STp->immediate_filemark)) 2813 cmd[1] |= 1; 2814 cmd[2] = (arg >> 16); 2815 cmd[3] = (arg >> 8); 2816 cmd[4] = arg; 2817 timeout = STp->device->request_queue->rq_timeout; 2818 DEBC( 2819 if (cmd_in != MTWSM) 2820 st_printk(ST_DEB_MSG, STp, 2821 "Writing %d filemarks.\n", 2822 cmd[2] * 65536 + 2823 cmd[3] * 256 + 2824 cmd[4]); 2825 else 2826 st_printk(ST_DEB_MSG, STp, 2827 "Writing %d setmarks.\n", 2828 cmd[2] * 65536 + 2829 cmd[3] * 256 + 2830 cmd[4]); 2831 ) 2832 if (fileno >= 0) 2833 fileno += arg; 2834 blkno = 0; 2835 at_sm = (cmd_in == MTWSM); 2836 break; 2837 case MTREW: 2838 cmd[0] = REZERO_UNIT; 2839 if (STp->immediate) { 2840 cmd[1] = 1; /* Don't wait for completion */ 2841 timeout = STp->device->request_queue->rq_timeout; 2842 } 2843 DEBC_printk(STp, "Rewinding tape.\n"); 2844 fileno = blkno = at_sm = 0; 2845 break; 2846 case MTNOP: 2847 DEBC_printk(STp, "No op on tape.\n"); 2848 return 0; /* Should do something ? */ 2849 break; 2850 case MTRETEN: 2851 cmd[0] = START_STOP; 2852 if (STp->immediate) { 2853 cmd[1] = 1; /* Don't wait for completion */ 2854 timeout = STp->device->request_queue->rq_timeout; 2855 } 2856 cmd[4] = 3; 2857 DEBC_printk(STp, "Retensioning tape.\n"); 2858 fileno = blkno = at_sm = 0; 2859 break; 2860 case MTEOM: 2861 if (!STp->fast_mteom) { 2862 /* space to the end of tape */ 2863 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2864 fileno = STps->drv_file; 2865 if (STps->eof >= ST_EOD_1) 2866 return 0; 2867 /* The next lines would hide the number of spaced FileMarks 2868 That's why I inserted the previous lines. I had no luck 2869 with detecting EOM with FSF, so we go now to EOM. 2870 Joerg Weule */ 2871 } else 2872 fileno = (-1); 2873 cmd[0] = SPACE; 2874 cmd[1] = 3; 2875 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2876 blkno = -1; 2877 at_sm = 0; 2878 break; 2879 case MTERASE: 2880 if (STp->write_prot) 2881 return (-EACCES); 2882 cmd[0] = ERASE; 2883 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2884 if (STp->immediate) { 2885 cmd[1] |= 2; /* Don't wait for completion */ 2886 timeout = STp->device->request_queue->rq_timeout; 2887 } 2888 else 2889 timeout = STp->long_timeout * 8; 2890 2891 DEBC_printk(STp, "Erasing tape.\n"); 2892 fileno = blkno = at_sm = 0; 2893 break; 2894 case MTSETBLK: /* Set block length */ 2895 case MTSETDENSITY: /* Set tape density */ 2896 case MTSETDRVBUFFER: /* Set drive buffering */ 2897 case SET_DENS_AND_BLK: /* Set density and block size */ 2898 chg_eof = 0; 2899 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2900 return (-EIO); /* Not allowed if data in buffer */ 2901 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2902 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2903 STp->max_block > 0 && 2904 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2905 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2906 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2907 return (-EINVAL); 2908 } 2909 cmd[0] = MODE_SELECT; 2910 if ((STp->use_pf & USE_PF)) 2911 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2912 cmd[4] = datalen = 12; 2913 direction = DMA_TO_DEVICE; 2914 2915 memset((STp->buffer)->b_data, 0, 12); 2916 if (cmd_in == MTSETDRVBUFFER) 2917 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2918 else 2919 (STp->buffer)->b_data[2] = 2920 STp->drv_buffer << 4; 2921 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2922 if (cmd_in == MTSETDENSITY) { 2923 (STp->buffer)->b_data[4] = arg; 2924 STp->density_changed = 1; /* At least we tried ;-) */ 2925 } else if (cmd_in == SET_DENS_AND_BLK) 2926 (STp->buffer)->b_data[4] = arg >> 24; 2927 else 2928 (STp->buffer)->b_data[4] = STp->density; 2929 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2930 ltmp = arg & MT_ST_BLKSIZE_MASK; 2931 if (cmd_in == MTSETBLK) 2932 STp->blksize_changed = 1; /* At least we tried ;-) */ 2933 } else 2934 ltmp = STp->block_size; 2935 (STp->buffer)->b_data[9] = (ltmp >> 16); 2936 (STp->buffer)->b_data[10] = (ltmp >> 8); 2937 (STp->buffer)->b_data[11] = ltmp; 2938 timeout = STp->device->request_queue->rq_timeout; 2939 DEBC( 2940 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2941 st_printk(ST_DEB_MSG, STp, 2942 "Setting block size to %d bytes.\n", 2943 (STp->buffer)->b_data[9] * 65536 + 2944 (STp->buffer)->b_data[10] * 256 + 2945 (STp->buffer)->b_data[11]); 2946 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2947 st_printk(ST_DEB_MSG, STp, 2948 "Setting density code to %x.\n", 2949 (STp->buffer)->b_data[4]); 2950 if (cmd_in == MTSETDRVBUFFER) 2951 st_printk(ST_DEB_MSG, STp, 2952 "Setting drive buffer code to %d.\n", 2953 ((STp->buffer)->b_data[2] >> 4) & 7); 2954 ) 2955 break; 2956 default: 2957 return (-ENOSYS); 2958 } 2959 2960 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2961 timeout, MAX_RETRIES, 1); 2962 if (!SRpnt) 2963 return (STp->buffer)->syscall_result; 2964 2965 ioctl_result = (STp->buffer)->syscall_result; 2966 2967 if (!ioctl_result) { /* SCSI command successful */ 2968 st_release_request(SRpnt); 2969 SRpnt = NULL; 2970 STps->drv_block = blkno; 2971 STps->drv_file = fileno; 2972 STps->at_sm = at_sm; 2973 2974 if (cmd_in == MTBSFM) 2975 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2976 else if (cmd_in == MTFSFM) 2977 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2978 2979 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2980 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2981 if (STp->block_size != 0) { 2982 (STp->buffer)->buffer_blocks = 2983 (STp->buffer)->buffer_size / STp->block_size; 2984 } 2985 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2986 if (cmd_in == SET_DENS_AND_BLK) 2987 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2988 } else if (cmd_in == MTSETDRVBUFFER) 2989 STp->drv_buffer = (arg & 7); 2990 else if (cmd_in == MTSETDENSITY) 2991 STp->density = arg; 2992 2993 if (cmd_in == MTEOM) 2994 STps->eof = ST_EOD; 2995 else if (cmd_in == MTFSF) 2996 STps->eof = ST_FM; 2997 else if (chg_eof) 2998 STps->eof = ST_NOEOF; 2999 3000 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3001 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3002 } else { /* SCSI command was not completely successful. Don't return 3003 from this block without releasing the SCSI command block! */ 3004 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3005 3006 if (cmdstatp->flags & SENSE_EOM) { 3007 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3008 cmd_in != MTBSR && cmd_in != MTBSS) 3009 STps->eof = ST_EOM_OK; 3010 STps->drv_block = 0; 3011 } 3012 3013 if (cmdstatp->remainder_valid) 3014 undone = (int)cmdstatp->uremainder64; 3015 else 3016 undone = 0; 3017 3018 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3019 cmdstatp->have_sense && 3020 (cmdstatp->flags & SENSE_EOM)) { 3021 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3022 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3023 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3024 STps->eof = ST_NOEOF; 3025 } else { /* Writing EOF(s) failed */ 3026 if (fileno >= 0) 3027 fileno -= undone; 3028 if (undone < arg) 3029 STps->eof = ST_NOEOF; 3030 } 3031 STps->drv_file = fileno; 3032 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3033 if (fileno >= 0) 3034 STps->drv_file = fileno - undone; 3035 else 3036 STps->drv_file = fileno; 3037 STps->drv_block = -1; 3038 STps->eof = ST_NOEOF; 3039 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3040 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3041 undone = (-undone); 3042 if (STps->drv_file >= 0) 3043 STps->drv_file = fileno + undone; 3044 STps->drv_block = 0; 3045 STps->eof = ST_NOEOF; 3046 } else if (cmd_in == MTFSR) { 3047 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3048 if (STps->drv_file >= 0) 3049 STps->drv_file++; 3050 STps->drv_block = 0; 3051 STps->eof = ST_FM; 3052 } else { 3053 if (blkno >= undone) 3054 STps->drv_block = blkno - undone; 3055 else 3056 STps->drv_block = (-1); 3057 STps->eof = ST_NOEOF; 3058 } 3059 } else if (cmd_in == MTBSR) { 3060 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3061 STps->drv_file--; 3062 STps->drv_block = (-1); 3063 } else { 3064 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3065 undone = (-undone); 3066 if (STps->drv_block >= 0) 3067 STps->drv_block = blkno + undone; 3068 } 3069 STps->eof = ST_NOEOF; 3070 } else if (cmd_in == MTEOM) { 3071 STps->drv_file = (-1); 3072 STps->drv_block = (-1); 3073 STps->eof = ST_EOD; 3074 } else if (cmd_in == MTSETBLK || 3075 cmd_in == MTSETDENSITY || 3076 cmd_in == MTSETDRVBUFFER || 3077 cmd_in == SET_DENS_AND_BLK) { 3078 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3079 !(STp->use_pf & PF_TESTED)) { 3080 /* Try the other possible state of Page Format if not 3081 already tried */ 3082 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3083 st_release_request(SRpnt); 3084 SRpnt = NULL; 3085 return st_int_ioctl(STp, cmd_in, arg); 3086 } 3087 } else if (chg_eof) 3088 STps->eof = ST_NOEOF; 3089 3090 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3091 STps->eof = ST_EOD; 3092 3093 st_release_request(SRpnt); 3094 SRpnt = NULL; 3095 } 3096 3097 return ioctl_result; 3098 } 3099 3100 3101 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3102 structure. */ 3103 3104 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3105 int logical) 3106 { 3107 int result; 3108 unsigned char scmd[MAX_COMMAND_SIZE]; 3109 struct st_request *SRpnt; 3110 3111 if (STp->ready != ST_READY) 3112 return (-EIO); 3113 3114 memset(scmd, 0, MAX_COMMAND_SIZE); 3115 if ((STp->device)->scsi_level < SCSI_2) { 3116 scmd[0] = QFA_REQUEST_BLOCK; 3117 scmd[4] = 3; 3118 } else { 3119 scmd[0] = READ_POSITION; 3120 if (!logical && !STp->scsi2_logical) 3121 scmd[1] = 1; 3122 } 3123 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3124 STp->device->request_queue->rq_timeout, 3125 MAX_READY_RETRIES, 1); 3126 if (!SRpnt) 3127 return (STp->buffer)->syscall_result; 3128 3129 if ((STp->buffer)->syscall_result != 0 || 3130 (STp->device->scsi_level >= SCSI_2 && 3131 ((STp->buffer)->b_data[0] & 4) != 0)) { 3132 *block = *partition = 0; 3133 DEBC_printk(STp, " Can't read tape position.\n"); 3134 result = (-EIO); 3135 } else { 3136 result = 0; 3137 if ((STp->device)->scsi_level < SCSI_2) { 3138 *block = ((STp->buffer)->b_data[0] << 16) 3139 + ((STp->buffer)->b_data[1] << 8) 3140 + (STp->buffer)->b_data[2]; 3141 *partition = 0; 3142 } else { 3143 *block = ((STp->buffer)->b_data[4] << 24) 3144 + ((STp->buffer)->b_data[5] << 16) 3145 + ((STp->buffer)->b_data[6] << 8) 3146 + (STp->buffer)->b_data[7]; 3147 *partition = (STp->buffer)->b_data[1]; 3148 if (((STp->buffer)->b_data[0] & 0x80) && 3149 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3150 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3151 } 3152 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3153 *block, *partition); 3154 } 3155 st_release_request(SRpnt); 3156 SRpnt = NULL; 3157 3158 return result; 3159 } 3160 3161 3162 /* Set the tape block and partition. Negative partition means that only the 3163 block should be set in vendor specific way. */ 3164 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3165 int logical) 3166 { 3167 struct st_partstat *STps; 3168 int result, p; 3169 unsigned int blk; 3170 int timeout; 3171 unsigned char scmd[MAX_COMMAND_SIZE]; 3172 struct st_request *SRpnt; 3173 3174 if (STp->ready != ST_READY) 3175 return (-EIO); 3176 timeout = STp->long_timeout; 3177 STps = &(STp->ps[STp->partition]); 3178 3179 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3180 block, partition); 3181 DEB(if (partition < 0) 3182 return (-EIO); ) 3183 3184 /* Update the location at the partition we are leaving */ 3185 if ((!STp->can_partitions && partition != 0) || 3186 partition >= ST_NBR_PARTITIONS) 3187 return (-EINVAL); 3188 if (partition != STp->partition) { 3189 if (get_location(STp, &blk, &p, 1)) 3190 STps->last_block_valid = 0; 3191 else { 3192 STps->last_block_valid = 1; 3193 STps->last_block_visited = blk; 3194 DEBC_printk(STp, "Visited block %d for " 3195 "partition %d saved.\n", 3196 blk, STp->partition); 3197 } 3198 } 3199 3200 memset(scmd, 0, MAX_COMMAND_SIZE); 3201 if ((STp->device)->scsi_level < SCSI_2) { 3202 scmd[0] = QFA_SEEK_BLOCK; 3203 scmd[2] = (block >> 16); 3204 scmd[3] = (block >> 8); 3205 scmd[4] = block; 3206 scmd[5] = 0; 3207 } else { 3208 scmd[0] = SEEK_10; 3209 scmd[3] = (block >> 24); 3210 scmd[4] = (block >> 16); 3211 scmd[5] = (block >> 8); 3212 scmd[6] = block; 3213 if (!logical && !STp->scsi2_logical) 3214 scmd[1] = 4; 3215 if (STp->partition != partition) { 3216 scmd[1] |= 2; 3217 scmd[8] = partition; 3218 DEBC_printk(STp, "Trying to change partition " 3219 "from %d to %d\n", STp->partition, 3220 partition); 3221 } 3222 } 3223 if (STp->immediate) { 3224 scmd[1] |= 1; /* Don't wait for completion */ 3225 timeout = STp->device->request_queue->rq_timeout; 3226 } 3227 3228 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3229 timeout, MAX_READY_RETRIES, 1); 3230 if (!SRpnt) 3231 return (STp->buffer)->syscall_result; 3232 3233 STps->drv_block = STps->drv_file = (-1); 3234 STps->eof = ST_NOEOF; 3235 if ((STp->buffer)->syscall_result != 0) { 3236 result = (-EIO); 3237 if (STp->can_partitions && 3238 (STp->device)->scsi_level >= SCSI_2 && 3239 (p = find_partition(STp)) >= 0) 3240 STp->partition = p; 3241 } else { 3242 if (STp->can_partitions) { 3243 STp->partition = partition; 3244 STps = &(STp->ps[partition]); 3245 if (!STps->last_block_valid || 3246 STps->last_block_visited != block) { 3247 STps->at_sm = 0; 3248 STps->rw = ST_IDLE; 3249 } 3250 } else 3251 STps->at_sm = 0; 3252 if (block == 0) 3253 STps->drv_block = STps->drv_file = 0; 3254 result = 0; 3255 } 3256 3257 st_release_request(SRpnt); 3258 SRpnt = NULL; 3259 3260 return result; 3261 } 3262 3263 3264 /* Find the current partition number for the drive status. Called from open and 3265 returns either partition number of negative error code. */ 3266 static int find_partition(struct scsi_tape *STp) 3267 { 3268 int i, partition; 3269 unsigned int block; 3270 3271 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3272 return i; 3273 if (partition >= ST_NBR_PARTITIONS) 3274 return (-EIO); 3275 return partition; 3276 } 3277 3278 3279 /* Change the partition if necessary */ 3280 static int switch_partition(struct scsi_tape *STp) 3281 { 3282 struct st_partstat *STps; 3283 3284 if (STp->partition == STp->new_partition) 3285 return 0; 3286 STps = &(STp->ps[STp->new_partition]); 3287 if (!STps->last_block_valid) 3288 STps->last_block_visited = 0; 3289 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3290 } 3291 3292 /* Functions for reading and writing the medium partition mode page. */ 3293 3294 #define PART_PAGE 0x11 3295 #define PART_PAGE_FIXED_LENGTH 8 3296 3297 #define PP_OFF_MAX_ADD_PARTS 2 3298 #define PP_OFF_NBR_ADD_PARTS 3 3299 #define PP_OFF_FLAGS 4 3300 #define PP_OFF_PART_UNITS 6 3301 #define PP_OFF_RESERVED 7 3302 3303 #define PP_BIT_IDP 0x20 3304 #define PP_BIT_FDP 0x80 3305 #define PP_MSK_PSUM_MB 0x10 3306 #define PP_MSK_PSUM_UNITS 0x18 3307 #define PP_MSK_POFM 0x04 3308 3309 /* Get the number of partitions on the tape. As a side effect reads the 3310 mode page into the tape buffer. */ 3311 static int nbr_partitions(struct scsi_tape *STp) 3312 { 3313 int result; 3314 3315 if (STp->ready != ST_READY) 3316 return (-EIO); 3317 3318 result = read_mode_page(STp, PART_PAGE, 1); 3319 3320 if (result) { 3321 DEBC_printk(STp, "Can't read medium partition page.\n"); 3322 result = (-EIO); 3323 } else { 3324 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3325 PP_OFF_NBR_ADD_PARTS] + 1; 3326 DEBC_printk(STp, "Number of partitions %d.\n", result); 3327 } 3328 3329 return result; 3330 } 3331 3332 3333 static int format_medium(struct scsi_tape *STp, int format) 3334 { 3335 int result = 0; 3336 int timeout = STp->long_timeout; 3337 unsigned char scmd[MAX_COMMAND_SIZE]; 3338 struct st_request *SRpnt; 3339 3340 memset(scmd, 0, MAX_COMMAND_SIZE); 3341 scmd[0] = FORMAT_UNIT; 3342 scmd[2] = format; 3343 if (STp->immediate) { 3344 scmd[1] |= 1; /* Don't wait for completion */ 3345 timeout = STp->device->request_queue->rq_timeout; 3346 } 3347 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3348 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3349 timeout, MAX_RETRIES, 1); 3350 if (!SRpnt) 3351 result = STp->buffer->syscall_result; 3352 return result; 3353 } 3354 3355 3356 /* Partition the tape into two partitions if size > 0 or one partition if 3357 size == 0. 3358 3359 The block descriptors are read and written because Sony SDT-7000 does not 3360 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3361 3362 My HP C1533A drive returns only one partition size field. This is used to 3363 set the size of partition 1. There is no size field for the default partition. 3364 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3365 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3366 The following algorithm is used to accommodate both drives: if the number of 3367 partition size fields is greater than the maximum number of additional partitions 3368 in the mode page, the second field is used. Otherwise the first field is used. 3369 3370 For Seagate DDS drives the page length must be 8 when no partitions is defined 3371 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3372 is acceptable also to some other old drives and enforced if the first partition 3373 size field is used for the first additional partition size. 3374 3375 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3376 */ 3377 static int partition_tape(struct scsi_tape *STp, int size) 3378 { 3379 int result; 3380 int target_partition; 3381 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3382 int pgo, psd_cnt, psdo; 3383 int psum = PP_MSK_PSUM_MB, units = 0; 3384 unsigned char *bp; 3385 3386 result = read_mode_page(STp, PART_PAGE, 0); 3387 if (result) { 3388 DEBC_printk(STp, "Can't read partition mode page.\n"); 3389 return result; 3390 } 3391 target_partition = 1; 3392 if (size < 0) { 3393 target_partition = 0; 3394 size = -size; 3395 } 3396 3397 /* The mode page is in the buffer. Let's modify it and write it. */ 3398 bp = (STp->buffer)->b_data; 3399 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3400 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3401 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3402 3403 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3404 3405 if (scsi3) { 3406 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3407 if (needs_format && size == 0) { 3408 /* No need to write the mode page when clearing 3409 * partitioning 3410 */ 3411 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3412 result = format_medium(STp, 0); 3413 goto out; 3414 } 3415 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3416 psd_cnt = 2; 3417 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3418 /* Use units scaling for large partitions if the device 3419 * suggests it and no precision lost. Required for IBM 3420 * TS1140/50 drives that don't support MB units. 3421 */ 3422 if (size >= 1000 && (size % 1000) == 0) { 3423 size /= 1000; 3424 psum = PP_MSK_PSUM_UNITS; 3425 units = 9; /* GB */ 3426 } 3427 } 3428 /* Try it anyway if too large to specify in MB */ 3429 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3430 size /= 1000; 3431 psum = PP_MSK_PSUM_UNITS; 3432 units = 9; /* GB */ 3433 } 3434 } 3435 3436 if (size >= 65535 || /* Does not fit into two bytes */ 3437 (target_partition == 0 && psd_cnt < 2)) { 3438 result = -EINVAL; 3439 goto out; 3440 } 3441 3442 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3443 /* The second condition is for HP DDS which use only one partition size 3444 * descriptor 3445 */ 3446 if (target_partition > 0 && 3447 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3448 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3449 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3450 psdo += 2; 3451 } 3452 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3453 3454 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3455 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3456 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3457 3458 if (size == 0) { 3459 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3460 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3461 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3462 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3463 } else { 3464 bp[psdo] = (size >> 8) & 0xff; 3465 bp[psdo + 1] = size & 0xff; 3466 if (target_partition == 0) 3467 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3468 bp[pgo + 3] = 1; 3469 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3470 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3471 DEBC_printk(STp, 3472 "Formatting tape with two partitions (%i = %d MB).\n", 3473 target_partition, units > 0 ? size * 1000 : size); 3474 } 3475 bp[pgo + PP_OFF_PART_UNITS] = 0; 3476 bp[pgo + PP_OFF_RESERVED] = 0; 3477 if (size != 1 || units != 0) { 3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3479 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3480 bp[pgo + PP_OFF_PART_UNITS] = units; 3481 } else 3482 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3483 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3484 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3485 3486 result = write_mode_page(STp, PART_PAGE, 1); 3487 3488 if (!result && needs_format) 3489 result = format_medium(STp, 1); 3490 3491 if (result) { 3492 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3493 result = (-EIO); 3494 } 3495 3496 out: 3497 return result; 3498 } 3499 3500 3501 3502 /* The ioctl command */ 3503 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3504 { 3505 int i, cmd_nr, cmd_type, bt; 3506 int retval = 0; 3507 unsigned int blk; 3508 struct scsi_tape *STp = file->private_data; 3509 struct st_modedef *STm; 3510 struct st_partstat *STps; 3511 void __user *p = (void __user *)arg; 3512 3513 if (mutex_lock_interruptible(&STp->lock)) 3514 return -ERESTARTSYS; 3515 3516 DEB( 3517 if (debugging && !STp->in_use) { 3518 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3519 retval = (-EIO); 3520 goto out; 3521 } ) /* end DEB */ 3522 3523 STm = &(STp->modes[STp->current_mode]); 3524 STps = &(STp->ps[STp->partition]); 3525 3526 /* 3527 * If we are in the middle of error recovery, don't let anyone 3528 * else try and use this device. Also, if error recovery fails, it 3529 * may try and take the device offline, in which case all further 3530 * access to the device is prohibited. 3531 */ 3532 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3533 file->f_flags & O_NDELAY); 3534 if (retval) 3535 goto out; 3536 3537 cmd_type = _IOC_TYPE(cmd_in); 3538 cmd_nr = _IOC_NR(cmd_in); 3539 3540 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3541 struct mtop mtc; 3542 3543 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3544 retval = (-EINVAL); 3545 goto out; 3546 } 3547 3548 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3549 if (i) { 3550 retval = (-EFAULT); 3551 goto out; 3552 } 3553 3554 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3555 st_printk(KERN_WARNING, STp, 3556 "MTSETDRVBUFFER only allowed for root.\n"); 3557 retval = (-EPERM); 3558 goto out; 3559 } 3560 if (!STm->defined && 3561 (mtc.mt_op != MTSETDRVBUFFER && 3562 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3563 retval = (-ENXIO); 3564 goto out; 3565 } 3566 3567 if (!STp->pos_unknown) { 3568 3569 if (STps->eof == ST_FM_HIT) { 3570 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3571 mtc.mt_op == MTEOM) { 3572 mtc.mt_count -= 1; 3573 if (STps->drv_file >= 0) 3574 STps->drv_file += 1; 3575 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3576 mtc.mt_count += 1; 3577 if (STps->drv_file >= 0) 3578 STps->drv_file += 1; 3579 } 3580 } 3581 3582 if (mtc.mt_op == MTSEEK) { 3583 /* Old position must be restored if partition will be 3584 changed */ 3585 i = !STp->can_partitions || 3586 (STp->new_partition != STp->partition); 3587 } else { 3588 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3589 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3590 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3591 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3592 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3593 mtc.mt_op == MTCOMPRESSION; 3594 } 3595 i = flush_buffer(STp, i); 3596 if (i < 0) { 3597 retval = i; 3598 goto out; 3599 } 3600 if (STps->rw == ST_WRITING && 3601 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3602 mtc.mt_op == MTSEEK || 3603 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3604 i = st_int_ioctl(STp, MTWEOF, 1); 3605 if (i < 0) { 3606 retval = i; 3607 goto out; 3608 } 3609 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3610 mtc.mt_count++; 3611 STps->rw = ST_IDLE; 3612 } 3613 3614 } else { 3615 /* 3616 * If there was a bus reset, block further access 3617 * to this device. If the user wants to rewind the tape, 3618 * then reset the flag and allow access again. 3619 */ 3620 if (mtc.mt_op != MTREW && 3621 mtc.mt_op != MTOFFL && 3622 mtc.mt_op != MTRETEN && 3623 mtc.mt_op != MTERASE && 3624 mtc.mt_op != MTSEEK && 3625 mtc.mt_op != MTEOM) { 3626 retval = (-EIO); 3627 goto out; 3628 } 3629 reset_state(STp); 3630 /* remove this when the midlevel properly clears was_reset */ 3631 STp->device->was_reset = 0; 3632 } 3633 3634 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3635 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3636 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3637 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3638 3639 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3640 do_door_lock(STp, 0); /* Ignore result! */ 3641 3642 if (mtc.mt_op == MTSETDRVBUFFER && 3643 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3644 retval = st_set_options(STp, mtc.mt_count); 3645 goto out; 3646 } 3647 3648 if (mtc.mt_op == MTSETPART) { 3649 if (!STp->can_partitions || 3650 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3651 retval = (-EINVAL); 3652 goto out; 3653 } 3654 if (mtc.mt_count >= STp->nbr_partitions && 3655 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3656 retval = (-EIO); 3657 goto out; 3658 } 3659 if (mtc.mt_count >= STp->nbr_partitions) { 3660 retval = (-EINVAL); 3661 goto out; 3662 } 3663 STp->new_partition = mtc.mt_count; 3664 retval = 0; 3665 goto out; 3666 } 3667 3668 if (mtc.mt_op == MTMKPART) { 3669 if (!STp->can_partitions) { 3670 retval = (-EINVAL); 3671 goto out; 3672 } 3673 i = do_load_unload(STp, file, 1); 3674 if (i < 0) { 3675 retval = i; 3676 goto out; 3677 } 3678 i = partition_tape(STp, mtc.mt_count); 3679 if (i < 0) { 3680 retval = i; 3681 goto out; 3682 } 3683 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3684 STp->ps[i].rw = ST_IDLE; 3685 STp->ps[i].at_sm = 0; 3686 STp->ps[i].last_block_valid = 0; 3687 } 3688 STp->partition = STp->new_partition = 0; 3689 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3690 STps->drv_block = STps->drv_file = 0; 3691 retval = 0; 3692 goto out; 3693 } 3694 3695 if (mtc.mt_op == MTSEEK) { 3696 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3697 if (!STp->can_partitions) 3698 STp->ps[0].rw = ST_IDLE; 3699 retval = i; 3700 goto out; 3701 } 3702 3703 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3704 retval = do_load_unload(STp, file, 0); 3705 goto out; 3706 } 3707 3708 if (mtc.mt_op == MTLOAD) { 3709 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3710 goto out; 3711 } 3712 3713 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3714 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3715 goto out; 3716 } 3717 3718 if (STp->can_partitions && STp->ready == ST_READY && 3719 (i = switch_partition(STp)) < 0) { 3720 retval = i; 3721 goto out; 3722 } 3723 3724 if (mtc.mt_op == MTCOMPRESSION) 3725 retval = st_compression(STp, (mtc.mt_count & 1)); 3726 else 3727 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3728 goto out; 3729 } 3730 if (!STm->defined) { 3731 retval = (-ENXIO); 3732 goto out; 3733 } 3734 3735 if ((i = flush_buffer(STp, 0)) < 0) { 3736 retval = i; 3737 goto out; 3738 } 3739 if (STp->can_partitions && 3740 (i = switch_partition(STp)) < 0) { 3741 retval = i; 3742 goto out; 3743 } 3744 3745 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3746 struct mtget mt_status; 3747 3748 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3749 retval = (-EINVAL); 3750 goto out; 3751 } 3752 3753 mt_status.mt_type = STp->tape_type; 3754 mt_status.mt_dsreg = 3755 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3756 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3757 mt_status.mt_blkno = STps->drv_block; 3758 mt_status.mt_fileno = STps->drv_file; 3759 if (STp->block_size != 0) { 3760 if (STps->rw == ST_WRITING) 3761 mt_status.mt_blkno += 3762 (STp->buffer)->buffer_bytes / STp->block_size; 3763 else if (STps->rw == ST_READING) 3764 mt_status.mt_blkno -= 3765 ((STp->buffer)->buffer_bytes + 3766 STp->block_size - 1) / STp->block_size; 3767 } 3768 3769 mt_status.mt_gstat = 0; 3770 if (STp->drv_write_prot) 3771 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3772 if (mt_status.mt_blkno == 0) { 3773 if (mt_status.mt_fileno == 0) 3774 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3775 else 3776 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3777 } 3778 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3779 mt_status.mt_resid = STp->partition; 3780 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3781 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3782 else if (STps->eof >= ST_EOM_OK) 3783 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3784 if (STp->density == 1) 3785 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3786 else if (STp->density == 2) 3787 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3788 else if (STp->density == 3) 3789 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3790 if (STp->ready == ST_READY) 3791 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3792 if (STp->ready == ST_NO_TAPE) 3793 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3794 if (STps->at_sm) 3795 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3796 if (STm->do_async_writes || 3797 (STm->do_buffer_writes && STp->block_size != 0) || 3798 STp->drv_buffer != 0) 3799 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3800 if (STp->cleaning_req) 3801 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3802 3803 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3804 if (i) { 3805 retval = (-EFAULT); 3806 goto out; 3807 } 3808 3809 STp->recover_reg = 0; /* Clear after read */ 3810 retval = 0; 3811 goto out; 3812 } /* End of MTIOCGET */ 3813 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3814 struct mtpos mt_pos; 3815 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3816 retval = (-EINVAL); 3817 goto out; 3818 } 3819 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3820 retval = i; 3821 goto out; 3822 } 3823 mt_pos.mt_blkno = blk; 3824 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3825 if (i) 3826 retval = (-EFAULT); 3827 goto out; 3828 } 3829 mutex_unlock(&STp->lock); 3830 switch (cmd_in) { 3831 case SCSI_IOCTL_GET_IDLUN: 3832 case SCSI_IOCTL_GET_BUS_NUMBER: 3833 break; 3834 default: 3835 if ((cmd_in == SG_IO || 3836 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3837 cmd_in == CDROM_SEND_PACKET) && 3838 !capable(CAP_SYS_RAWIO)) 3839 i = -EPERM; 3840 else 3841 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3842 file->f_mode, cmd_in, p); 3843 if (i != -ENOTTY) 3844 return i; 3845 break; 3846 } 3847 retval = scsi_ioctl(STp->device, cmd_in, p); 3848 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3849 STp->rew_at_close = 0; 3850 STp->ready = ST_NO_TAPE; 3851 } 3852 return retval; 3853 3854 out: 3855 mutex_unlock(&STp->lock); 3856 return retval; 3857 } 3858 3859 #ifdef CONFIG_COMPAT 3860 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3861 { 3862 struct scsi_tape *STp = file->private_data; 3863 struct scsi_device *sdev = STp->device; 3864 int ret = -ENOIOCTLCMD; 3865 if (sdev->host->hostt->compat_ioctl) { 3866 3867 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3868 3869 } 3870 return ret; 3871 } 3872 #endif 3873 3874 3875 3876 /* Try to allocate a new tape buffer. Calling function must not hold 3877 dev_arr_lock. */ 3878 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3879 { 3880 struct st_buffer *tb; 3881 3882 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3883 if (!tb) { 3884 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3885 return NULL; 3886 } 3887 tb->frp_segs = 0; 3888 tb->use_sg = max_sg; 3889 tb->dma = need_dma; 3890 tb->buffer_size = 0; 3891 3892 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3893 GFP_KERNEL); 3894 if (!tb->reserved_pages) { 3895 kfree(tb); 3896 return NULL; 3897 } 3898 3899 return tb; 3900 } 3901 3902 3903 /* Try to allocate enough space in the tape buffer */ 3904 #define ST_MAX_ORDER 6 3905 3906 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3907 { 3908 int segs, max_segs, b_size, order, got; 3909 gfp_t priority; 3910 3911 if (new_size <= STbuffer->buffer_size) 3912 return 1; 3913 3914 if (STbuffer->buffer_size <= PAGE_SIZE) 3915 normalize_buffer(STbuffer); /* Avoid extra segment */ 3916 3917 max_segs = STbuffer->use_sg; 3918 3919 priority = GFP_KERNEL | __GFP_NOWARN; 3920 if (need_dma) 3921 priority |= GFP_DMA; 3922 3923 if (STbuffer->cleared) 3924 priority |= __GFP_ZERO; 3925 3926 if (STbuffer->frp_segs) { 3927 order = STbuffer->reserved_page_order; 3928 b_size = PAGE_SIZE << order; 3929 } else { 3930 for (b_size = PAGE_SIZE, order = 0; 3931 order < ST_MAX_ORDER && 3932 max_segs * (PAGE_SIZE << order) < new_size; 3933 order++, b_size *= 2) 3934 ; /* empty */ 3935 STbuffer->reserved_page_order = order; 3936 } 3937 if (max_segs * (PAGE_SIZE << order) < new_size) { 3938 if (order == ST_MAX_ORDER) 3939 return 0; 3940 normalize_buffer(STbuffer); 3941 return enlarge_buffer(STbuffer, new_size, need_dma); 3942 } 3943 3944 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3945 segs < max_segs && got < new_size;) { 3946 struct page *page; 3947 3948 page = alloc_pages(priority, order); 3949 if (!page) { 3950 DEB(STbuffer->buffer_size = got); 3951 normalize_buffer(STbuffer); 3952 return 0; 3953 } 3954 3955 STbuffer->frp_segs += 1; 3956 got += b_size; 3957 STbuffer->buffer_size = got; 3958 STbuffer->reserved_pages[segs] = page; 3959 segs++; 3960 } 3961 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3962 3963 return 1; 3964 } 3965 3966 3967 /* Make sure that no data from previous user is in the internal buffer */ 3968 static void clear_buffer(struct st_buffer * st_bp) 3969 { 3970 int i; 3971 3972 for (i=0; i < st_bp->frp_segs; i++) 3973 memset(page_address(st_bp->reserved_pages[i]), 0, 3974 PAGE_SIZE << st_bp->reserved_page_order); 3975 st_bp->cleared = 1; 3976 } 3977 3978 3979 /* Release the extra buffer */ 3980 static void normalize_buffer(struct st_buffer * STbuffer) 3981 { 3982 int i, order = STbuffer->reserved_page_order; 3983 3984 for (i = 0; i < STbuffer->frp_segs; i++) { 3985 __free_pages(STbuffer->reserved_pages[i], order); 3986 STbuffer->buffer_size -= (PAGE_SIZE << order); 3987 } 3988 STbuffer->frp_segs = 0; 3989 STbuffer->sg_segs = 0; 3990 STbuffer->reserved_page_order = 0; 3991 STbuffer->map_data.offset = 0; 3992 } 3993 3994 3995 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3996 negative error code. */ 3997 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3998 { 3999 int i, cnt, res, offset; 4000 int length = PAGE_SIZE << st_bp->reserved_page_order; 4001 4002 for (i = 0, offset = st_bp->buffer_bytes; 4003 i < st_bp->frp_segs && offset >= length; i++) 4004 offset -= length; 4005 if (i == st_bp->frp_segs) { /* Should never happen */ 4006 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4007 return (-EIO); 4008 } 4009 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4010 struct page *page = st_bp->reserved_pages[i]; 4011 cnt = length - offset < do_count ? length - offset : do_count; 4012 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4013 if (res) 4014 return (-EFAULT); 4015 do_count -= cnt; 4016 st_bp->buffer_bytes += cnt; 4017 ubp += cnt; 4018 offset = 0; 4019 } 4020 if (do_count) /* Should never happen */ 4021 return (-EIO); 4022 4023 return 0; 4024 } 4025 4026 4027 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4028 negative error code. */ 4029 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4030 { 4031 int i, cnt, res, offset; 4032 int length = PAGE_SIZE << st_bp->reserved_page_order; 4033 4034 for (i = 0, offset = st_bp->read_pointer; 4035 i < st_bp->frp_segs && offset >= length; i++) 4036 offset -= length; 4037 if (i == st_bp->frp_segs) { /* Should never happen */ 4038 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4039 return (-EIO); 4040 } 4041 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4042 struct page *page = st_bp->reserved_pages[i]; 4043 cnt = length - offset < do_count ? length - offset : do_count; 4044 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4045 if (res) 4046 return (-EFAULT); 4047 do_count -= cnt; 4048 st_bp->buffer_bytes -= cnt; 4049 st_bp->read_pointer += cnt; 4050 ubp += cnt; 4051 offset = 0; 4052 } 4053 if (do_count) /* Should never happen */ 4054 return (-EIO); 4055 4056 return 0; 4057 } 4058 4059 4060 /* Move data towards start of buffer */ 4061 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4062 { 4063 int src_seg, dst_seg, src_offset = 0, dst_offset; 4064 int count, total; 4065 int length = PAGE_SIZE << st_bp->reserved_page_order; 4066 4067 if (offset == 0) 4068 return; 4069 4070 total=st_bp->buffer_bytes - offset; 4071 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4072 src_offset = offset; 4073 if (src_offset < length) 4074 break; 4075 offset -= length; 4076 } 4077 4078 st_bp->buffer_bytes = st_bp->read_pointer = total; 4079 for (dst_seg=dst_offset=0; total > 0; ) { 4080 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4081 struct page *spage = st_bp->reserved_pages[src_seg]; 4082 4083 count = min(length - dst_offset, length - src_offset); 4084 memmove(page_address(dpage) + dst_offset, 4085 page_address(spage) + src_offset, count); 4086 src_offset += count; 4087 if (src_offset >= length) { 4088 src_seg++; 4089 src_offset = 0; 4090 } 4091 dst_offset += count; 4092 if (dst_offset >= length) { 4093 dst_seg++; 4094 dst_offset = 0; 4095 } 4096 total -= count; 4097 } 4098 } 4099 4100 /* Validate the options from command line or module parameters */ 4101 static void validate_options(void) 4102 { 4103 if (buffer_kbs > 0) 4104 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4105 if (max_sg_segs >= ST_FIRST_SG) 4106 st_max_sg_segs = max_sg_segs; 4107 } 4108 4109 #ifndef MODULE 4110 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4111 */ 4112 static int __init st_setup(char *str) 4113 { 4114 int i, len, ints[5]; 4115 char *stp; 4116 4117 stp = get_options(str, ARRAY_SIZE(ints), ints); 4118 4119 if (ints[0] > 0) { 4120 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4121 if (parms[i].val) 4122 *parms[i].val = ints[i + 1]; 4123 } else { 4124 while (stp != NULL) { 4125 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4126 len = strlen(parms[i].name); 4127 if (!strncmp(stp, parms[i].name, len) && 4128 (*(stp + len) == ':' || *(stp + len) == '=')) { 4129 if (parms[i].val) 4130 *parms[i].val = 4131 simple_strtoul(stp + len + 1, NULL, 0); 4132 else 4133 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4134 parms[i].name); 4135 break; 4136 } 4137 } 4138 if (i >= ARRAY_SIZE(parms)) 4139 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4140 stp); 4141 stp = strchr(stp, ','); 4142 if (stp) 4143 stp++; 4144 } 4145 } 4146 4147 validate_options(); 4148 4149 return 1; 4150 } 4151 4152 __setup("st=", st_setup); 4153 4154 #endif 4155 4156 static const struct file_operations st_fops = 4157 { 4158 .owner = THIS_MODULE, 4159 .read = st_read, 4160 .write = st_write, 4161 .unlocked_ioctl = st_ioctl, 4162 #ifdef CONFIG_COMPAT 4163 .compat_ioctl = st_compat_ioctl, 4164 #endif 4165 .open = st_open, 4166 .flush = st_flush, 4167 .release = st_release, 4168 .llseek = noop_llseek, 4169 }; 4170 4171 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4172 { 4173 int i, error; 4174 dev_t cdev_devno; 4175 struct cdev *cdev; 4176 struct device *dev; 4177 struct st_modedef *STm = &(tape->modes[mode]); 4178 char name[10]; 4179 int dev_num = tape->index; 4180 4181 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4182 4183 cdev = cdev_alloc(); 4184 if (!cdev) { 4185 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4186 error = -ENOMEM; 4187 goto out; 4188 } 4189 cdev->owner = THIS_MODULE; 4190 cdev->ops = &st_fops; 4191 STm->cdevs[rew] = cdev; 4192 4193 error = cdev_add(cdev, cdev_devno, 1); 4194 if (error) { 4195 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4196 rew ? "non" : "auto", mode); 4197 pr_err("st%d: Device not attached.\n", dev_num); 4198 goto out_free; 4199 } 4200 4201 i = mode << (4 - ST_NBR_MODE_BITS); 4202 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4203 tape->disk->disk_name, st_formats[i]); 4204 4205 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4206 cdev_devno, &tape->modes[mode], "%s", name); 4207 if (IS_ERR(dev)) { 4208 pr_err("st%d: device_create failed\n", dev_num); 4209 error = PTR_ERR(dev); 4210 goto out_free; 4211 } 4212 4213 STm->devs[rew] = dev; 4214 4215 return 0; 4216 out_free: 4217 cdev_del(STm->cdevs[rew]); 4218 out: 4219 STm->cdevs[rew] = NULL; 4220 STm->devs[rew] = NULL; 4221 return error; 4222 } 4223 4224 static int create_cdevs(struct scsi_tape *tape) 4225 { 4226 int mode, error; 4227 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4228 error = create_one_cdev(tape, mode, 0); 4229 if (error) 4230 return error; 4231 error = create_one_cdev(tape, mode, 1); 4232 if (error) 4233 return error; 4234 } 4235 4236 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4237 &tape->modes[0].devs[0]->kobj, "tape"); 4238 } 4239 4240 static void remove_cdevs(struct scsi_tape *tape) 4241 { 4242 int mode, rew; 4243 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4244 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4245 struct st_modedef *STm = &(tape->modes[mode]); 4246 for (rew = 0; rew < 2; rew++) { 4247 if (STm->cdevs[rew]) 4248 cdev_del(STm->cdevs[rew]); 4249 if (STm->devs[rew]) 4250 device_unregister(STm->devs[rew]); 4251 } 4252 } 4253 } 4254 4255 static int st_probe(struct device *dev) 4256 { 4257 struct scsi_device *SDp = to_scsi_device(dev); 4258 struct gendisk *disk = NULL; 4259 struct scsi_tape *tpnt = NULL; 4260 struct st_modedef *STm; 4261 struct st_partstat *STps; 4262 struct st_buffer *buffer; 4263 int i, error; 4264 char *stp; 4265 4266 if (SDp->type != TYPE_TAPE) 4267 return -ENODEV; 4268 if ((stp = st_incompatible(SDp))) { 4269 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4270 sdev_printk(KERN_INFO, SDp, 4271 "st: The suggested driver is %s.\n", stp); 4272 return -ENODEV; 4273 } 4274 4275 scsi_autopm_get_device(SDp); 4276 i = queue_max_segments(SDp->request_queue); 4277 if (st_max_sg_segs < i) 4278 i = st_max_sg_segs; 4279 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4280 if (buffer == NULL) { 4281 sdev_printk(KERN_ERR, SDp, 4282 "st: Can't allocate new tape buffer. " 4283 "Device not attached.\n"); 4284 goto out; 4285 } 4286 4287 disk = alloc_disk(1); 4288 if (!disk) { 4289 sdev_printk(KERN_ERR, SDp, 4290 "st: out of memory. Device not attached.\n"); 4291 goto out_buffer_free; 4292 } 4293 4294 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4295 if (tpnt == NULL) { 4296 sdev_printk(KERN_ERR, SDp, 4297 "st: Can't allocate device descriptor.\n"); 4298 goto out_put_disk; 4299 } 4300 kref_init(&tpnt->kref); 4301 tpnt->disk = disk; 4302 disk->private_data = &tpnt->driver; 4303 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4304 * take queue reference that release_disk() expects. */ 4305 if (!blk_get_queue(SDp->request_queue)) 4306 goto out_put_disk; 4307 disk->queue = SDp->request_queue; 4308 tpnt->driver = &st_template; 4309 4310 tpnt->device = SDp; 4311 if (SDp->scsi_level <= 2) 4312 tpnt->tape_type = MT_ISSCSI1; 4313 else 4314 tpnt->tape_type = MT_ISSCSI2; 4315 4316 tpnt->buffer = buffer; 4317 tpnt->buffer->last_SRpnt = NULL; 4318 4319 tpnt->inited = 0; 4320 tpnt->dirty = 0; 4321 tpnt->in_use = 0; 4322 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4323 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4324 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4325 tpnt->density = 0; 4326 tpnt->do_auto_lock = ST_AUTO_LOCK; 4327 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4328 tpnt->can_partitions = 0; 4329 tpnt->two_fm = ST_TWO_FM; 4330 tpnt->fast_mteom = ST_FAST_MTEOM; 4331 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4332 tpnt->sili = ST_SILI; 4333 tpnt->immediate = ST_NOWAIT; 4334 tpnt->immediate_filemark = 0; 4335 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4336 tpnt->partition = 0; 4337 tpnt->new_partition = 0; 4338 tpnt->nbr_partitions = 0; 4339 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4340 tpnt->long_timeout = ST_LONG_TIMEOUT; 4341 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4342 4343 for (i = 0; i < ST_NBR_MODES; i++) { 4344 STm = &(tpnt->modes[i]); 4345 STm->defined = 0; 4346 STm->sysv = ST_SYSV; 4347 STm->defaults_for_writes = 0; 4348 STm->do_async_writes = ST_ASYNC_WRITES; 4349 STm->do_buffer_writes = ST_BUFFER_WRITES; 4350 STm->do_read_ahead = ST_READ_AHEAD; 4351 STm->default_compression = ST_DONT_TOUCH; 4352 STm->default_blksize = (-1); /* No forced size */ 4353 STm->default_density = (-1); /* No forced density */ 4354 STm->tape = tpnt; 4355 } 4356 4357 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4358 STps = &(tpnt->ps[i]); 4359 STps->rw = ST_IDLE; 4360 STps->eof = ST_NOEOF; 4361 STps->at_sm = 0; 4362 STps->last_block_valid = 0; 4363 STps->drv_block = (-1); 4364 STps->drv_file = (-1); 4365 } 4366 4367 tpnt->current_mode = 0; 4368 tpnt->modes[0].defined = 1; 4369 4370 tpnt->density_changed = tpnt->compression_changed = 4371 tpnt->blksize_changed = 0; 4372 mutex_init(&tpnt->lock); 4373 4374 idr_preload(GFP_KERNEL); 4375 spin_lock(&st_index_lock); 4376 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4377 spin_unlock(&st_index_lock); 4378 idr_preload_end(); 4379 if (error < 0) { 4380 pr_warn("st: idr allocation failed: %d\n", error); 4381 goto out_put_queue; 4382 } 4383 tpnt->index = error; 4384 sprintf(disk->disk_name, "st%d", tpnt->index); 4385 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4386 if (tpnt->stats == NULL) { 4387 sdev_printk(KERN_ERR, SDp, 4388 "st: Can't allocate statistics.\n"); 4389 goto out_idr_remove; 4390 } 4391 4392 dev_set_drvdata(dev, tpnt); 4393 4394 4395 error = create_cdevs(tpnt); 4396 if (error) 4397 goto out_remove_devs; 4398 scsi_autopm_put_device(SDp); 4399 4400 sdev_printk(KERN_NOTICE, SDp, 4401 "Attached scsi tape %s\n", tape_name(tpnt)); 4402 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4403 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4404 queue_dma_alignment(SDp->request_queue) + 1); 4405 4406 return 0; 4407 4408 out_remove_devs: 4409 remove_cdevs(tpnt); 4410 kfree(tpnt->stats); 4411 out_idr_remove: 4412 spin_lock(&st_index_lock); 4413 idr_remove(&st_index_idr, tpnt->index); 4414 spin_unlock(&st_index_lock); 4415 out_put_queue: 4416 blk_put_queue(disk->queue); 4417 out_put_disk: 4418 put_disk(disk); 4419 kfree(tpnt); 4420 out_buffer_free: 4421 kfree(buffer); 4422 out: 4423 scsi_autopm_put_device(SDp); 4424 return -ENODEV; 4425 }; 4426 4427 4428 static int st_remove(struct device *dev) 4429 { 4430 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4431 int index = tpnt->index; 4432 4433 scsi_autopm_get_device(to_scsi_device(dev)); 4434 remove_cdevs(tpnt); 4435 4436 mutex_lock(&st_ref_mutex); 4437 kref_put(&tpnt->kref, scsi_tape_release); 4438 mutex_unlock(&st_ref_mutex); 4439 spin_lock(&st_index_lock); 4440 idr_remove(&st_index_idr, index); 4441 spin_unlock(&st_index_lock); 4442 return 0; 4443 } 4444 4445 /** 4446 * scsi_tape_release - Called to free the Scsi_Tape structure 4447 * @kref: pointer to embedded kref 4448 * 4449 * st_ref_mutex must be held entering this routine. Because it is 4450 * called on last put, you should always use the scsi_tape_get() 4451 * scsi_tape_put() helpers which manipulate the semaphore directly 4452 * and never do a direct kref_put(). 4453 **/ 4454 static void scsi_tape_release(struct kref *kref) 4455 { 4456 struct scsi_tape *tpnt = to_scsi_tape(kref); 4457 struct gendisk *disk = tpnt->disk; 4458 4459 tpnt->device = NULL; 4460 4461 if (tpnt->buffer) { 4462 normalize_buffer(tpnt->buffer); 4463 kfree(tpnt->buffer->reserved_pages); 4464 kfree(tpnt->buffer); 4465 } 4466 4467 disk->private_data = NULL; 4468 put_disk(disk); 4469 kfree(tpnt->stats); 4470 kfree(tpnt); 4471 return; 4472 } 4473 4474 static struct class st_sysfs_class = { 4475 .name = "scsi_tape", 4476 .dev_groups = st_dev_groups, 4477 }; 4478 4479 static int __init init_st(void) 4480 { 4481 int err; 4482 4483 validate_options(); 4484 4485 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4486 verstr, st_fixed_buffer_size, st_max_sg_segs); 4487 4488 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4489 if (debugging) { 4490 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4491 debugging); 4492 } 4493 4494 err = class_register(&st_sysfs_class); 4495 if (err) { 4496 pr_err("Unable register sysfs class for SCSI tapes\n"); 4497 return err; 4498 } 4499 4500 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4501 ST_MAX_TAPE_ENTRIES, "st"); 4502 if (err) { 4503 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4504 SCSI_TAPE_MAJOR); 4505 goto err_class; 4506 } 4507 4508 err = scsi_register_driver(&st_template.gendrv); 4509 if (err) 4510 goto err_chrdev; 4511 4512 return 0; 4513 4514 err_chrdev: 4515 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4516 ST_MAX_TAPE_ENTRIES); 4517 err_class: 4518 class_unregister(&st_sysfs_class); 4519 return err; 4520 } 4521 4522 static void __exit exit_st(void) 4523 { 4524 scsi_unregister_driver(&st_template.gendrv); 4525 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4526 ST_MAX_TAPE_ENTRIES); 4527 class_unregister(&st_sysfs_class); 4528 idr_destroy(&st_index_idr); 4529 printk(KERN_INFO "st: Unloaded.\n"); 4530 } 4531 4532 module_init(init_st); 4533 module_exit(exit_st); 4534 4535 4536 /* The sysfs driver interface. Read-only at the moment */ 4537 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4538 { 4539 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4540 } 4541 static DRIVER_ATTR_RO(try_direct_io); 4542 4543 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4544 { 4545 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4546 } 4547 static DRIVER_ATTR_RO(fixed_buffer_size); 4548 4549 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4550 { 4551 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4552 } 4553 static DRIVER_ATTR_RO(max_sg_segs); 4554 4555 static ssize_t version_show(struct device_driver *ddd, char *buf) 4556 { 4557 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4558 } 4559 static DRIVER_ATTR_RO(version); 4560 4561 #if DEBUG 4562 static ssize_t debug_flag_store(struct device_driver *ddp, 4563 const char *buf, size_t count) 4564 { 4565 /* We only care what the first byte of the data is the rest is unused. 4566 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4567 * other values have -EINVAL returned if they are passed in. 4568 */ 4569 if (count > 0) { 4570 if (buf[0] == '0') { 4571 debugging = NO_DEBUG; 4572 return count; 4573 } else if (buf[0] == '1') { 4574 debugging = 1; 4575 return count; 4576 } 4577 } 4578 return -EINVAL; 4579 } 4580 4581 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4582 { 4583 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4584 } 4585 static DRIVER_ATTR_RW(debug_flag); 4586 #endif 4587 4588 static struct attribute *st_drv_attrs[] = { 4589 &driver_attr_try_direct_io.attr, 4590 &driver_attr_fixed_buffer_size.attr, 4591 &driver_attr_max_sg_segs.attr, 4592 &driver_attr_version.attr, 4593 #if DEBUG 4594 &driver_attr_debug_flag.attr, 4595 #endif 4596 NULL, 4597 }; 4598 ATTRIBUTE_GROUPS(st_drv); 4599 4600 /* The sysfs simple class interface */ 4601 static ssize_t 4602 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4603 { 4604 struct st_modedef *STm = dev_get_drvdata(dev); 4605 ssize_t l = 0; 4606 4607 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4608 return l; 4609 } 4610 static DEVICE_ATTR_RO(defined); 4611 4612 static ssize_t 4613 default_blksize_show(struct device *dev, struct device_attribute *attr, 4614 char *buf) 4615 { 4616 struct st_modedef *STm = dev_get_drvdata(dev); 4617 ssize_t l = 0; 4618 4619 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4620 return l; 4621 } 4622 static DEVICE_ATTR_RO(default_blksize); 4623 4624 static ssize_t 4625 default_density_show(struct device *dev, struct device_attribute *attr, 4626 char *buf) 4627 { 4628 struct st_modedef *STm = dev_get_drvdata(dev); 4629 ssize_t l = 0; 4630 char *fmt; 4631 4632 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4633 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4634 return l; 4635 } 4636 static DEVICE_ATTR_RO(default_density); 4637 4638 static ssize_t 4639 default_compression_show(struct device *dev, struct device_attribute *attr, 4640 char *buf) 4641 { 4642 struct st_modedef *STm = dev_get_drvdata(dev); 4643 ssize_t l = 0; 4644 4645 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4646 return l; 4647 } 4648 static DEVICE_ATTR_RO(default_compression); 4649 4650 static ssize_t 4651 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4652 { 4653 struct st_modedef *STm = dev_get_drvdata(dev); 4654 struct scsi_tape *STp = STm->tape; 4655 int options; 4656 ssize_t l = 0; 4657 4658 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4659 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4660 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4661 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4662 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4663 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4664 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4665 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4666 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4667 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4668 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4669 options |= STm->sysv ? MT_ST_SYSV : 0; 4670 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4671 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4672 options |= STp->sili ? MT_ST_SILI : 0; 4673 4674 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4675 return l; 4676 } 4677 static DEVICE_ATTR_RO(options); 4678 4679 /* Support for tape stats */ 4680 4681 /** 4682 * read_cnt_show - return read count - count of reads made from tape drive 4683 * @dev: struct device 4684 * @attr: attribute structure 4685 * @buf: buffer to return formatted data in 4686 */ 4687 static ssize_t read_cnt_show(struct device *dev, 4688 struct device_attribute *attr, char *buf) 4689 { 4690 struct st_modedef *STm = dev_get_drvdata(dev); 4691 4692 return sprintf(buf, "%lld", 4693 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4694 } 4695 static DEVICE_ATTR_RO(read_cnt); 4696 4697 /** 4698 * read_byte_cnt_show - return read byte count - tape drives 4699 * may use blocks less than 512 bytes this gives the raw byte count of 4700 * of data read from the tape drive. 4701 * @dev: struct device 4702 * @attr: attribute structure 4703 * @buf: buffer to return formatted data in 4704 */ 4705 static ssize_t read_byte_cnt_show(struct device *dev, 4706 struct device_attribute *attr, char *buf) 4707 { 4708 struct st_modedef *STm = dev_get_drvdata(dev); 4709 4710 return sprintf(buf, "%lld", 4711 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4712 } 4713 static DEVICE_ATTR_RO(read_byte_cnt); 4714 4715 /** 4716 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4717 * @dev: struct device 4718 * @attr: attribute structure 4719 * @buf: buffer to return formatted data in 4720 */ 4721 static ssize_t read_ns_show(struct device *dev, 4722 struct device_attribute *attr, char *buf) 4723 { 4724 struct st_modedef *STm = dev_get_drvdata(dev); 4725 4726 return sprintf(buf, "%lld", 4727 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4728 } 4729 static DEVICE_ATTR_RO(read_ns); 4730 4731 /** 4732 * write_cnt_show - write count - number of user calls 4733 * to write(2) that have written data to tape. 4734 * @dev: struct device 4735 * @attr: attribute structure 4736 * @buf: buffer to return formatted data in 4737 */ 4738 static ssize_t write_cnt_show(struct device *dev, 4739 struct device_attribute *attr, char *buf) 4740 { 4741 struct st_modedef *STm = dev_get_drvdata(dev); 4742 4743 return sprintf(buf, "%lld", 4744 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4745 } 4746 static DEVICE_ATTR_RO(write_cnt); 4747 4748 /** 4749 * write_byte_cnt_show - write byte count - raw count of 4750 * bytes written to tape. 4751 * @dev: struct device 4752 * @attr: attribute structure 4753 * @buf: buffer to return formatted data in 4754 */ 4755 static ssize_t write_byte_cnt_show(struct device *dev, 4756 struct device_attribute *attr, char *buf) 4757 { 4758 struct st_modedef *STm = dev_get_drvdata(dev); 4759 4760 return sprintf(buf, "%lld", 4761 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4762 } 4763 static DEVICE_ATTR_RO(write_byte_cnt); 4764 4765 /** 4766 * write_ns_show - write ns - number of nanoseconds waiting on write 4767 * requests to complete. 4768 * @dev: struct device 4769 * @attr: attribute structure 4770 * @buf: buffer to return formatted data in 4771 */ 4772 static ssize_t write_ns_show(struct device *dev, 4773 struct device_attribute *attr, char *buf) 4774 { 4775 struct st_modedef *STm = dev_get_drvdata(dev); 4776 4777 return sprintf(buf, "%lld", 4778 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4779 } 4780 static DEVICE_ATTR_RO(write_ns); 4781 4782 /** 4783 * in_flight_show - number of I/Os currently in flight - 4784 * in most cases this will be either 0 or 1. It may be higher if someone 4785 * has also issued other SCSI commands such as via an ioctl. 4786 * @dev: struct device 4787 * @attr: attribute structure 4788 * @buf: buffer to return formatted data in 4789 */ 4790 static ssize_t in_flight_show(struct device *dev, 4791 struct device_attribute *attr, char *buf) 4792 { 4793 struct st_modedef *STm = dev_get_drvdata(dev); 4794 4795 return sprintf(buf, "%lld", 4796 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4797 } 4798 static DEVICE_ATTR_RO(in_flight); 4799 4800 /** 4801 * io_ns_show - io wait ns - this is the number of ns spent 4802 * waiting on all I/O to complete. This includes tape movement commands 4803 * such as rewinding, seeking to end of file or tape, it also includes 4804 * read and write. To determine the time spent on tape movement 4805 * subtract the read and write ns from this value. 4806 * @dev: struct device 4807 * @attr: attribute structure 4808 * @buf: buffer to return formatted data in 4809 */ 4810 static ssize_t io_ns_show(struct device *dev, 4811 struct device_attribute *attr, char *buf) 4812 { 4813 struct st_modedef *STm = dev_get_drvdata(dev); 4814 4815 return sprintf(buf, "%lld", 4816 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4817 } 4818 static DEVICE_ATTR_RO(io_ns); 4819 4820 /** 4821 * other_cnt_show - other io count - this is the number of 4822 * I/O requests other than read and write requests. 4823 * Typically these are tape movement requests but will include driver 4824 * tape movement. This includes only requests issued by the st driver. 4825 * @dev: struct device 4826 * @attr: attribute structure 4827 * @buf: buffer to return formatted data in 4828 */ 4829 static ssize_t other_cnt_show(struct device *dev, 4830 struct device_attribute *attr, char *buf) 4831 { 4832 struct st_modedef *STm = dev_get_drvdata(dev); 4833 4834 return sprintf(buf, "%lld", 4835 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4836 } 4837 static DEVICE_ATTR_RO(other_cnt); 4838 4839 /** 4840 * resid_cnt_show - A count of the number of times we get a residual 4841 * count - this should indicate someone issuing reads larger than the 4842 * block size on tape. 4843 * @dev: struct device 4844 * @attr: attribute structure 4845 * @buf: buffer to return formatted data in 4846 */ 4847 static ssize_t resid_cnt_show(struct device *dev, 4848 struct device_attribute *attr, char *buf) 4849 { 4850 struct st_modedef *STm = dev_get_drvdata(dev); 4851 4852 return sprintf(buf, "%lld", 4853 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4854 } 4855 static DEVICE_ATTR_RO(resid_cnt); 4856 4857 static struct attribute *st_dev_attrs[] = { 4858 &dev_attr_defined.attr, 4859 &dev_attr_default_blksize.attr, 4860 &dev_attr_default_density.attr, 4861 &dev_attr_default_compression.attr, 4862 &dev_attr_options.attr, 4863 NULL, 4864 }; 4865 4866 static struct attribute *st_stats_attrs[] = { 4867 &dev_attr_read_cnt.attr, 4868 &dev_attr_read_byte_cnt.attr, 4869 &dev_attr_read_ns.attr, 4870 &dev_attr_write_cnt.attr, 4871 &dev_attr_write_byte_cnt.attr, 4872 &dev_attr_write_ns.attr, 4873 &dev_attr_in_flight.attr, 4874 &dev_attr_io_ns.attr, 4875 &dev_attr_other_cnt.attr, 4876 &dev_attr_resid_cnt.attr, 4877 NULL, 4878 }; 4879 4880 static struct attribute_group stats_group = { 4881 .name = "stats", 4882 .attrs = st_stats_attrs, 4883 }; 4884 4885 static struct attribute_group st_group = { 4886 .attrs = st_dev_attrs, 4887 }; 4888 4889 static const struct attribute_group *st_dev_groups[] = { 4890 &st_group, 4891 &stats_group, 4892 NULL, 4893 }; 4894 4895 /* The following functions may be useful for a larger audience. */ 4896 static int sgl_map_user_pages(struct st_buffer *STbp, 4897 const unsigned int max_pages, unsigned long uaddr, 4898 size_t count, int rw) 4899 { 4900 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4901 unsigned long start = uaddr >> PAGE_SHIFT; 4902 const int nr_pages = end - start; 4903 int res, i, j; 4904 struct page **pages; 4905 struct rq_map_data *mdata = &STbp->map_data; 4906 4907 /* User attempted Overflow! */ 4908 if ((uaddr + count) < uaddr) 4909 return -EINVAL; 4910 4911 /* Too big */ 4912 if (nr_pages > max_pages) 4913 return -ENOMEM; 4914 4915 /* Hmm? */ 4916 if (count == 0) 4917 return 0; 4918 4919 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4920 if (pages == NULL) 4921 return -ENOMEM; 4922 4923 /* Try to fault in all of the necessary pages */ 4924 /* rw==READ means read from drive, write into memory area */ 4925 res = get_user_pages_fast(uaddr, nr_pages, rw == READ, pages); 4926 4927 /* Errors and no page mapped should return here */ 4928 if (res < nr_pages) 4929 goto out_unmap; 4930 4931 for (i=0; i < nr_pages; i++) { 4932 /* FIXME: flush superflous for rw==READ, 4933 * probably wrong function for rw==WRITE 4934 */ 4935 flush_dcache_page(pages[i]); 4936 } 4937 4938 mdata->offset = uaddr & ~PAGE_MASK; 4939 STbp->mapped_pages = pages; 4940 4941 return nr_pages; 4942 out_unmap: 4943 if (res > 0) { 4944 for (j=0; j < res; j++) 4945 put_page(pages[j]); 4946 res = 0; 4947 } 4948 kfree(pages); 4949 return res; 4950 } 4951 4952 4953 /* And unmap them... */ 4954 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4955 const unsigned int nr_pages, int dirtied) 4956 { 4957 int i; 4958 4959 for (i=0; i < nr_pages; i++) { 4960 struct page *page = STbp->mapped_pages[i]; 4961 4962 if (dirtied) 4963 SetPageDirty(page); 4964 /* FIXME: cache flush missing for rw==READ 4965 * FIXME: call the correct reference counting function 4966 */ 4967 put_page(page); 4968 } 4969 kfree(STbp->mapped_pages); 4970 STbp->mapped_pages = NULL; 4971 4972 return 0; 4973 } 4974