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.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 <asm/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)) ) 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 case 0x70: 341 s->fixed_format = 1; 342 s->flags = sense[2] & 0xe0; 343 break; 344 case 0x73: 345 s->deferred = 1; 346 case 0x72: 347 s->fixed_format = 0; 348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 349 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 350 break; 351 } 352 } 353 } 354 355 356 /* Convert the result to success code */ 357 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 358 { 359 int result = SRpnt->result; 360 u8 scode; 361 DEB(const char *stp;) 362 char *name = tape_name(STp); 363 struct st_cmdstatus *cmdstatp; 364 365 if (!result) 366 return 0; 367 368 cmdstatp = &STp->buffer->cmdstat; 369 st_analyze_sense(SRpnt, cmdstatp); 370 371 if (cmdstatp->have_sense) 372 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 373 else 374 scode = 0; 375 376 DEB( 377 if (debugging) { 378 st_printk(ST_DEB_MSG, STp, 379 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 382 if (cmdstatp->have_sense) 383 __scsi_print_sense(STp->device, name, 384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 385 } ) /* end DEB */ 386 if (!debugging) { /* Abnormal conditions for tape */ 387 if (!cmdstatp->have_sense) 388 st_printk(KERN_WARNING, STp, 389 "Error %x (driver bt 0x%x, host bt 0x%x).\n", 390 result, driver_byte(result), host_byte(result)); 391 else if (cmdstatp->have_sense && 392 scode != NO_SENSE && 393 scode != RECOVERED_ERROR && 394 /* scode != UNIT_ATTENTION && */ 395 scode != BLANK_CHECK && 396 scode != VOLUME_OVERFLOW && 397 SRpnt->cmd[0] != MODE_SENSE && 398 SRpnt->cmd[0] != TEST_UNIT_READY) { 399 400 __scsi_print_sense(STp->device, name, 401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 402 } 403 } 404 405 if (cmdstatp->fixed_format && 406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 407 if (STp->cln_sense_value) 408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 409 STp->cln_sense_mask) == STp->cln_sense_value); 410 else 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 412 STp->cln_sense_mask) != 0); 413 } 414 if (cmdstatp->have_sense && 415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 417 418 STp->pos_unknown |= STp->device->was_reset; 419 420 if (cmdstatp->have_sense && 421 scode == RECOVERED_ERROR 422 #if ST_RECOVERED_WRITE_FATAL 423 && SRpnt->cmd[0] != WRITE_6 424 && SRpnt->cmd[0] != WRITE_FILEMARKS 425 #endif 426 ) { 427 STp->recover_count++; 428 STp->recover_reg++; 429 430 DEB( 431 if (debugging) { 432 if (SRpnt->cmd[0] == READ_6) 433 stp = "read"; 434 else if (SRpnt->cmd[0] == WRITE_6) 435 stp = "write"; 436 else 437 stp = "ioctl"; 438 st_printk(ST_DEB_MSG, STp, 439 "Recovered %s error (%d).\n", 440 stp, STp->recover_count); 441 } ) /* end DEB */ 442 443 if (cmdstatp->flags == 0) 444 return 0; 445 } 446 return (-EIO); 447 } 448 449 static struct st_request *st_allocate_request(struct scsi_tape *stp) 450 { 451 struct st_request *streq; 452 453 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 454 if (streq) 455 streq->stp = stp; 456 else { 457 st_printk(KERN_ERR, stp, 458 "Can't get SCSI request.\n"); 459 if (signal_pending(current)) 460 stp->buffer->syscall_result = -EINTR; 461 else 462 stp->buffer->syscall_result = -EBUSY; 463 } 464 465 return streq; 466 } 467 468 static void st_release_request(struct st_request *streq) 469 { 470 kfree(streq); 471 } 472 473 static void st_do_stats(struct scsi_tape *STp, struct request *req) 474 { 475 ktime_t now; 476 477 now = ktime_get(); 478 if (req->cmd[0] == WRITE_6) { 479 now = ktime_sub(now, STp->stats->write_time); 480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 482 atomic64_inc(&STp->stats->write_cnt); 483 if (req->errors) { 484 atomic64_add(atomic_read(&STp->stats->last_write_size) 485 - STp->buffer->cmdstat.residual, 486 &STp->stats->write_byte_cnt); 487 if (STp->buffer->cmdstat.residual > 0) 488 atomic64_inc(&STp->stats->resid_cnt); 489 } else 490 atomic64_add(atomic_read(&STp->stats->last_write_size), 491 &STp->stats->write_byte_cnt); 492 } else if (req->cmd[0] == READ_6) { 493 now = ktime_sub(now, STp->stats->read_time); 494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 496 atomic64_inc(&STp->stats->read_cnt); 497 if (req->errors) { 498 atomic64_add(atomic_read(&STp->stats->last_read_size) 499 - STp->buffer->cmdstat.residual, 500 &STp->stats->read_byte_cnt); 501 if (STp->buffer->cmdstat.residual > 0) 502 atomic64_inc(&STp->stats->resid_cnt); 503 } else 504 atomic64_add(atomic_read(&STp->stats->last_read_size), 505 &STp->stats->read_byte_cnt); 506 } else { 507 now = ktime_sub(now, STp->stats->other_time); 508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 509 atomic64_inc(&STp->stats->other_cnt); 510 } 511 atomic64_dec(&STp->stats->in_flight); 512 } 513 514 static void st_scsi_execute_end(struct request *req, int uptodate) 515 { 516 struct st_request *SRpnt = req->end_io_data; 517 struct scsi_tape *STp = SRpnt->stp; 518 struct bio *tmp; 519 520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; 521 STp->buffer->cmdstat.residual = req->resid_len; 522 523 st_do_stats(STp, req); 524 525 tmp = SRpnt->bio; 526 if (SRpnt->waiting) 527 complete(SRpnt->waiting); 528 529 blk_rq_unmap_user(tmp); 530 __blk_put_request(req->q, req); 531 } 532 533 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 534 int data_direction, void *buffer, unsigned bufflen, 535 int timeout, int retries) 536 { 537 struct request *req; 538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 539 int err = 0; 540 int write = (data_direction == DMA_TO_DEVICE); 541 struct scsi_tape *STp = SRpnt->stp; 542 543 req = blk_get_request(SRpnt->stp->device->request_queue, write, 544 GFP_KERNEL); 545 if (IS_ERR(req)) 546 return DRIVER_ERROR << 24; 547 548 blk_rq_set_block_pc(req); 549 req->cmd_flags |= REQ_QUIET; 550 551 mdata->null_mapped = 1; 552 553 if (bufflen) { 554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 555 GFP_KERNEL); 556 if (err) { 557 blk_put_request(req); 558 return DRIVER_ERROR << 24; 559 } 560 } 561 562 atomic64_inc(&STp->stats->in_flight); 563 if (cmd[0] == WRITE_6) { 564 atomic_set(&STp->stats->last_write_size, bufflen); 565 STp->stats->write_time = ktime_get(); 566 } else if (cmd[0] == READ_6) { 567 atomic_set(&STp->stats->last_read_size, bufflen); 568 STp->stats->read_time = ktime_get(); 569 } else { 570 STp->stats->other_time = ktime_get(); 571 } 572 573 SRpnt->bio = req->bio; 574 req->cmd_len = COMMAND_SIZE(cmd[0]); 575 memset(req->cmd, 0, BLK_MAX_CDB); 576 memcpy(req->cmd, cmd, req->cmd_len); 577 req->sense = SRpnt->sense; 578 req->sense_len = 0; 579 req->timeout = timeout; 580 req->retries = retries; 581 req->end_io_data = SRpnt; 582 583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); 584 return 0; 585 } 586 587 /* Do the scsi command. Waits until command performed if do_wait is true. 588 Otherwise write_behind_check() is used to check that the command 589 has finished. */ 590 static struct st_request * 591 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 592 int bytes, int direction, int timeout, int retries, int do_wait) 593 { 594 struct completion *waiting; 595 struct rq_map_data *mdata = &STp->buffer->map_data; 596 int ret; 597 598 /* if async, make sure there's no command outstanding */ 599 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 600 st_printk(KERN_ERR, STp, 601 "Async command already active.\n"); 602 if (signal_pending(current)) 603 (STp->buffer)->syscall_result = (-EINTR); 604 else 605 (STp->buffer)->syscall_result = (-EBUSY); 606 return NULL; 607 } 608 609 if (!SRpnt) { 610 SRpnt = st_allocate_request(STp); 611 if (!SRpnt) 612 return NULL; 613 } 614 615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 616 which IO is outstanding. It's nulled out when the IO completes. */ 617 if (!do_wait) 618 (STp->buffer)->last_SRpnt = SRpnt; 619 620 waiting = &STp->wait; 621 init_completion(waiting); 622 SRpnt->waiting = waiting; 623 624 if (STp->buffer->do_dio) { 625 mdata->page_order = 0; 626 mdata->nr_entries = STp->buffer->sg_segs; 627 mdata->pages = STp->buffer->mapped_pages; 628 } else { 629 mdata->page_order = STp->buffer->reserved_page_order; 630 mdata->nr_entries = 631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 632 mdata->pages = STp->buffer->reserved_pages; 633 mdata->offset = 0; 634 } 635 636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 637 STp->buffer->cmdstat.have_sense = 0; 638 STp->buffer->syscall_result = 0; 639 640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 641 retries); 642 if (ret) { 643 /* could not allocate the buffer or request was too large */ 644 (STp->buffer)->syscall_result = (-EBUSY); 645 (STp->buffer)->last_SRpnt = NULL; 646 } else if (do_wait) { 647 wait_for_completion(waiting); 648 SRpnt->waiting = NULL; 649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 650 } 651 652 return SRpnt; 653 } 654 655 656 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 657 write has been correct but EOM early warning reached, -EIO if write ended in 658 error or zero if write successful. Asynchronous writes are used only in 659 variable block mode. */ 660 static int write_behind_check(struct scsi_tape * STp) 661 { 662 int retval = 0; 663 struct st_buffer *STbuffer; 664 struct st_partstat *STps; 665 struct st_cmdstatus *cmdstatp; 666 struct st_request *SRpnt; 667 668 STbuffer = STp->buffer; 669 if (!STbuffer->writing) 670 return 0; 671 672 DEB( 673 if (STp->write_pending) 674 STp->nbr_waits++; 675 else 676 STp->nbr_finished++; 677 ) /* end DEB */ 678 679 wait_for_completion(&(STp->wait)); 680 SRpnt = STbuffer->last_SRpnt; 681 STbuffer->last_SRpnt = NULL; 682 SRpnt->waiting = NULL; 683 684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 685 st_release_request(SRpnt); 686 687 STbuffer->buffer_bytes -= STbuffer->writing; 688 STps = &(STp->ps[STp->partition]); 689 if (STps->drv_block >= 0) { 690 if (STp->block_size == 0) 691 STps->drv_block++; 692 else 693 STps->drv_block += STbuffer->writing / STp->block_size; 694 } 695 696 cmdstatp = &STbuffer->cmdstat; 697 if (STbuffer->syscall_result) { 698 retval = -EIO; 699 if (cmdstatp->have_sense && !cmdstatp->deferred && 700 (cmdstatp->flags & SENSE_EOM) && 701 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 703 /* EOM at write-behind, has all data been written? */ 704 if (!cmdstatp->remainder_valid || 705 cmdstatp->uremainder64 == 0) 706 retval = -ENOSPC; 707 } 708 if (retval == -EIO) 709 STps->drv_block = -1; 710 } 711 STbuffer->writing = 0; 712 713 DEB(if (debugging && retval) 714 st_printk(ST_DEB_MSG, STp, 715 "Async write error %x, return value %d.\n", 716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 717 718 return retval; 719 } 720 721 722 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 723 it messes up the block number). */ 724 static int cross_eof(struct scsi_tape * STp, int forward) 725 { 726 struct st_request *SRpnt; 727 unsigned char cmd[MAX_COMMAND_SIZE]; 728 729 cmd[0] = SPACE; 730 cmd[1] = 0x01; /* Space FileMarks */ 731 if (forward) { 732 cmd[2] = cmd[3] = 0; 733 cmd[4] = 1; 734 } else 735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 736 cmd[5] = 0; 737 738 DEBC_printk(STp, "Stepping over filemark %s.\n", 739 forward ? "forward" : "backward"); 740 741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 742 STp->device->request_queue->rq_timeout, 743 MAX_RETRIES, 1); 744 if (!SRpnt) 745 return (STp->buffer)->syscall_result; 746 747 st_release_request(SRpnt); 748 SRpnt = NULL; 749 750 if ((STp->buffer)->cmdstat.midlevel_result != 0) 751 st_printk(KERN_ERR, STp, 752 "Stepping over filemark %s failed.\n", 753 forward ? "forward" : "backward"); 754 755 return (STp->buffer)->syscall_result; 756 } 757 758 759 /* Flush the write buffer (never need to write if variable blocksize). */ 760 static int st_flush_write_buffer(struct scsi_tape * STp) 761 { 762 int transfer, blks; 763 int result; 764 unsigned char cmd[MAX_COMMAND_SIZE]; 765 struct st_request *SRpnt; 766 struct st_partstat *STps; 767 768 result = write_behind_check(STp); 769 if (result) 770 return result; 771 772 result = 0; 773 if (STp->dirty == 1) { 774 775 transfer = STp->buffer->buffer_bytes; 776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 777 778 memset(cmd, 0, MAX_COMMAND_SIZE); 779 cmd[0] = WRITE_6; 780 cmd[1] = 1; 781 blks = transfer / STp->block_size; 782 cmd[2] = blks >> 16; 783 cmd[3] = blks >> 8; 784 cmd[4] = blks; 785 786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 787 STp->device->request_queue->rq_timeout, 788 MAX_WRITE_RETRIES, 1); 789 if (!SRpnt) 790 return (STp->buffer)->syscall_result; 791 792 STps = &(STp->ps[STp->partition]); 793 if ((STp->buffer)->syscall_result != 0) { 794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 795 796 if (cmdstatp->have_sense && !cmdstatp->deferred && 797 (cmdstatp->flags & SENSE_EOM) && 798 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 800 (!cmdstatp->remainder_valid || 801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 802 STp->dirty = 0; 803 (STp->buffer)->buffer_bytes = 0; 804 if (STps->drv_block >= 0) 805 STps->drv_block += blks; 806 result = (-ENOSPC); 807 } else { 808 st_printk(KERN_ERR, STp, "Error on flush.\n"); 809 STps->drv_block = (-1); 810 result = (-EIO); 811 } 812 } else { 813 if (STps->drv_block >= 0) 814 STps->drv_block += blks; 815 STp->dirty = 0; 816 (STp->buffer)->buffer_bytes = 0; 817 } 818 st_release_request(SRpnt); 819 SRpnt = NULL; 820 } 821 return result; 822 } 823 824 825 /* Flush the tape buffer. The tape will be positioned correctly unless 826 seek_next is true. */ 827 static int flush_buffer(struct scsi_tape *STp, int seek_next) 828 { 829 int backspace, result; 830 struct st_buffer *STbuffer; 831 struct st_partstat *STps; 832 833 STbuffer = STp->buffer; 834 835 /* 836 * If there was a bus reset, block further access 837 * to this device. 838 */ 839 if (STp->pos_unknown) 840 return (-EIO); 841 842 if (STp->ready != ST_READY) 843 return 0; 844 STps = &(STp->ps[STp->partition]); 845 if (STps->rw == ST_WRITING) /* Writing */ 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 case MTFSF: 2727 cmd[0] = SPACE; 2728 cmd[1] = 0x01; /* Space FileMarks */ 2729 cmd[2] = (arg >> 16); 2730 cmd[3] = (arg >> 8); 2731 cmd[4] = arg; 2732 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2733 if (fileno >= 0) 2734 fileno += arg; 2735 blkno = 0; 2736 at_sm &= (arg == 0); 2737 break; 2738 case MTBSFM: 2739 chg_eof = 0; /* Changed from the FSF after this */ 2740 case MTBSF: 2741 cmd[0] = SPACE; 2742 cmd[1] = 0x01; /* Space FileMarks */ 2743 ltmp = (-arg); 2744 cmd[2] = (ltmp >> 16); 2745 cmd[3] = (ltmp >> 8); 2746 cmd[4] = ltmp; 2747 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2748 if (fileno >= 0) 2749 fileno -= arg; 2750 blkno = (-1); /* We can't know the block number */ 2751 at_sm &= (arg == 0); 2752 break; 2753 case MTFSR: 2754 cmd[0] = SPACE; 2755 cmd[1] = 0x00; /* Space Blocks */ 2756 cmd[2] = (arg >> 16); 2757 cmd[3] = (arg >> 8); 2758 cmd[4] = arg; 2759 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2760 if (blkno >= 0) 2761 blkno += arg; 2762 at_sm &= (arg == 0); 2763 break; 2764 case MTBSR: 2765 cmd[0] = SPACE; 2766 cmd[1] = 0x00; /* Space Blocks */ 2767 ltmp = (-arg); 2768 cmd[2] = (ltmp >> 16); 2769 cmd[3] = (ltmp >> 8); 2770 cmd[4] = ltmp; 2771 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2772 if (blkno >= 0) 2773 blkno -= arg; 2774 at_sm &= (arg == 0); 2775 break; 2776 case MTFSS: 2777 cmd[0] = SPACE; 2778 cmd[1] = 0x04; /* Space Setmarks */ 2779 cmd[2] = (arg >> 16); 2780 cmd[3] = (arg >> 8); 2781 cmd[4] = arg; 2782 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2783 if (arg != 0) { 2784 blkno = fileno = (-1); 2785 at_sm = 1; 2786 } 2787 break; 2788 case MTBSS: 2789 cmd[0] = SPACE; 2790 cmd[1] = 0x04; /* Space Setmarks */ 2791 ltmp = (-arg); 2792 cmd[2] = (ltmp >> 16); 2793 cmd[3] = (ltmp >> 8); 2794 cmd[4] = ltmp; 2795 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2796 if (arg != 0) { 2797 blkno = fileno = (-1); 2798 at_sm = 1; 2799 } 2800 break; 2801 case MTWEOF: 2802 case MTWEOFI: 2803 case MTWSM: 2804 if (STp->write_prot) 2805 return (-EACCES); 2806 cmd[0] = WRITE_FILEMARKS; 2807 if (cmd_in == MTWSM) 2808 cmd[1] = 2; 2809 if (cmd_in == MTWEOFI || 2810 (cmd_in == MTWEOF && STp->immediate_filemark)) 2811 cmd[1] |= 1; 2812 cmd[2] = (arg >> 16); 2813 cmd[3] = (arg >> 8); 2814 cmd[4] = arg; 2815 timeout = STp->device->request_queue->rq_timeout; 2816 DEBC( 2817 if (cmd_in != MTWSM) 2818 st_printk(ST_DEB_MSG, STp, 2819 "Writing %d filemarks.\n", 2820 cmd[2] * 65536 + 2821 cmd[3] * 256 + 2822 cmd[4]); 2823 else 2824 st_printk(ST_DEB_MSG, STp, 2825 "Writing %d setmarks.\n", 2826 cmd[2] * 65536 + 2827 cmd[3] * 256 + 2828 cmd[4]); 2829 ) 2830 if (fileno >= 0) 2831 fileno += arg; 2832 blkno = 0; 2833 at_sm = (cmd_in == MTWSM); 2834 break; 2835 case MTREW: 2836 cmd[0] = REZERO_UNIT; 2837 if (STp->immediate) { 2838 cmd[1] = 1; /* Don't wait for completion */ 2839 timeout = STp->device->request_queue->rq_timeout; 2840 } 2841 DEBC_printk(STp, "Rewinding tape.\n"); 2842 fileno = blkno = at_sm = 0; 2843 break; 2844 case MTNOP: 2845 DEBC_printk(STp, "No op on tape.\n"); 2846 return 0; /* Should do something ? */ 2847 break; 2848 case MTRETEN: 2849 cmd[0] = START_STOP; 2850 if (STp->immediate) { 2851 cmd[1] = 1; /* Don't wait for completion */ 2852 timeout = STp->device->request_queue->rq_timeout; 2853 } 2854 cmd[4] = 3; 2855 DEBC_printk(STp, "Retensioning tape.\n"); 2856 fileno = blkno = at_sm = 0; 2857 break; 2858 case MTEOM: 2859 if (!STp->fast_mteom) { 2860 /* space to the end of tape */ 2861 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2862 fileno = STps->drv_file; 2863 if (STps->eof >= ST_EOD_1) 2864 return 0; 2865 /* The next lines would hide the number of spaced FileMarks 2866 That's why I inserted the previous lines. I had no luck 2867 with detecting EOM with FSF, so we go now to EOM. 2868 Joerg Weule */ 2869 } else 2870 fileno = (-1); 2871 cmd[0] = SPACE; 2872 cmd[1] = 3; 2873 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2874 blkno = -1; 2875 at_sm = 0; 2876 break; 2877 case MTERASE: 2878 if (STp->write_prot) 2879 return (-EACCES); 2880 cmd[0] = ERASE; 2881 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2882 if (STp->immediate) { 2883 cmd[1] |= 2; /* Don't wait for completion */ 2884 timeout = STp->device->request_queue->rq_timeout; 2885 } 2886 else 2887 timeout = STp->long_timeout * 8; 2888 2889 DEBC_printk(STp, "Erasing tape.\n"); 2890 fileno = blkno = at_sm = 0; 2891 break; 2892 case MTSETBLK: /* Set block length */ 2893 case MTSETDENSITY: /* Set tape density */ 2894 case MTSETDRVBUFFER: /* Set drive buffering */ 2895 case SET_DENS_AND_BLK: /* Set density and block size */ 2896 chg_eof = 0; 2897 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2898 return (-EIO); /* Not allowed if data in buffer */ 2899 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2900 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2901 STp->max_block > 0 && 2902 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2903 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2904 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2905 return (-EINVAL); 2906 } 2907 cmd[0] = MODE_SELECT; 2908 if ((STp->use_pf & USE_PF)) 2909 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2910 cmd[4] = datalen = 12; 2911 direction = DMA_TO_DEVICE; 2912 2913 memset((STp->buffer)->b_data, 0, 12); 2914 if (cmd_in == MTSETDRVBUFFER) 2915 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2916 else 2917 (STp->buffer)->b_data[2] = 2918 STp->drv_buffer << 4; 2919 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2920 if (cmd_in == MTSETDENSITY) { 2921 (STp->buffer)->b_data[4] = arg; 2922 STp->density_changed = 1; /* At least we tried ;-) */ 2923 } else if (cmd_in == SET_DENS_AND_BLK) 2924 (STp->buffer)->b_data[4] = arg >> 24; 2925 else 2926 (STp->buffer)->b_data[4] = STp->density; 2927 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2928 ltmp = arg & MT_ST_BLKSIZE_MASK; 2929 if (cmd_in == MTSETBLK) 2930 STp->blksize_changed = 1; /* At least we tried ;-) */ 2931 } else 2932 ltmp = STp->block_size; 2933 (STp->buffer)->b_data[9] = (ltmp >> 16); 2934 (STp->buffer)->b_data[10] = (ltmp >> 8); 2935 (STp->buffer)->b_data[11] = ltmp; 2936 timeout = STp->device->request_queue->rq_timeout; 2937 DEBC( 2938 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2939 st_printk(ST_DEB_MSG, STp, 2940 "Setting block size to %d bytes.\n", 2941 (STp->buffer)->b_data[9] * 65536 + 2942 (STp->buffer)->b_data[10] * 256 + 2943 (STp->buffer)->b_data[11]); 2944 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2945 st_printk(ST_DEB_MSG, STp, 2946 "Setting density code to %x.\n", 2947 (STp->buffer)->b_data[4]); 2948 if (cmd_in == MTSETDRVBUFFER) 2949 st_printk(ST_DEB_MSG, STp, 2950 "Setting drive buffer code to %d.\n", 2951 ((STp->buffer)->b_data[2] >> 4) & 7); 2952 ) 2953 break; 2954 default: 2955 return (-ENOSYS); 2956 } 2957 2958 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2959 timeout, MAX_RETRIES, 1); 2960 if (!SRpnt) 2961 return (STp->buffer)->syscall_result; 2962 2963 ioctl_result = (STp->buffer)->syscall_result; 2964 2965 if (!ioctl_result) { /* SCSI command successful */ 2966 st_release_request(SRpnt); 2967 SRpnt = NULL; 2968 STps->drv_block = blkno; 2969 STps->drv_file = fileno; 2970 STps->at_sm = at_sm; 2971 2972 if (cmd_in == MTBSFM) 2973 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2974 else if (cmd_in == MTFSFM) 2975 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2976 2977 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2978 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2979 if (STp->block_size != 0) { 2980 (STp->buffer)->buffer_blocks = 2981 (STp->buffer)->buffer_size / STp->block_size; 2982 } 2983 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2984 if (cmd_in == SET_DENS_AND_BLK) 2985 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2986 } else if (cmd_in == MTSETDRVBUFFER) 2987 STp->drv_buffer = (arg & 7); 2988 else if (cmd_in == MTSETDENSITY) 2989 STp->density = arg; 2990 2991 if (cmd_in == MTEOM) 2992 STps->eof = ST_EOD; 2993 else if (cmd_in == MTFSF) 2994 STps->eof = ST_FM; 2995 else if (chg_eof) 2996 STps->eof = ST_NOEOF; 2997 2998 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 2999 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3000 } else { /* SCSI command was not completely successful. Don't return 3001 from this block without releasing the SCSI command block! */ 3002 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3003 3004 if (cmdstatp->flags & SENSE_EOM) { 3005 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3006 cmd_in != MTBSR && cmd_in != MTBSS) 3007 STps->eof = ST_EOM_OK; 3008 STps->drv_block = 0; 3009 } 3010 3011 if (cmdstatp->remainder_valid) 3012 undone = (int)cmdstatp->uremainder64; 3013 else 3014 undone = 0; 3015 3016 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3017 cmdstatp->have_sense && 3018 (cmdstatp->flags & SENSE_EOM)) { 3019 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3020 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3021 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3022 STps->eof = ST_NOEOF; 3023 } else { /* Writing EOF(s) failed */ 3024 if (fileno >= 0) 3025 fileno -= undone; 3026 if (undone < arg) 3027 STps->eof = ST_NOEOF; 3028 } 3029 STps->drv_file = fileno; 3030 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3031 if (fileno >= 0) 3032 STps->drv_file = fileno - undone; 3033 else 3034 STps->drv_file = fileno; 3035 STps->drv_block = -1; 3036 STps->eof = ST_NOEOF; 3037 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3038 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3039 undone = (-undone); 3040 if (STps->drv_file >= 0) 3041 STps->drv_file = fileno + undone; 3042 STps->drv_block = 0; 3043 STps->eof = ST_NOEOF; 3044 } else if (cmd_in == MTFSR) { 3045 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3046 if (STps->drv_file >= 0) 3047 STps->drv_file++; 3048 STps->drv_block = 0; 3049 STps->eof = ST_FM; 3050 } else { 3051 if (blkno >= undone) 3052 STps->drv_block = blkno - undone; 3053 else 3054 STps->drv_block = (-1); 3055 STps->eof = ST_NOEOF; 3056 } 3057 } else if (cmd_in == MTBSR) { 3058 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3059 STps->drv_file--; 3060 STps->drv_block = (-1); 3061 } else { 3062 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3063 undone = (-undone); 3064 if (STps->drv_block >= 0) 3065 STps->drv_block = blkno + undone; 3066 } 3067 STps->eof = ST_NOEOF; 3068 } else if (cmd_in == MTEOM) { 3069 STps->drv_file = (-1); 3070 STps->drv_block = (-1); 3071 STps->eof = ST_EOD; 3072 } else if (cmd_in == MTSETBLK || 3073 cmd_in == MTSETDENSITY || 3074 cmd_in == MTSETDRVBUFFER || 3075 cmd_in == SET_DENS_AND_BLK) { 3076 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3077 !(STp->use_pf & PF_TESTED)) { 3078 /* Try the other possible state of Page Format if not 3079 already tried */ 3080 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3081 st_release_request(SRpnt); 3082 SRpnt = NULL; 3083 return st_int_ioctl(STp, cmd_in, arg); 3084 } 3085 } else if (chg_eof) 3086 STps->eof = ST_NOEOF; 3087 3088 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3089 STps->eof = ST_EOD; 3090 3091 st_release_request(SRpnt); 3092 SRpnt = NULL; 3093 } 3094 3095 return ioctl_result; 3096 } 3097 3098 3099 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3100 structure. */ 3101 3102 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3103 int logical) 3104 { 3105 int result; 3106 unsigned char scmd[MAX_COMMAND_SIZE]; 3107 struct st_request *SRpnt; 3108 3109 if (STp->ready != ST_READY) 3110 return (-EIO); 3111 3112 memset(scmd, 0, MAX_COMMAND_SIZE); 3113 if ((STp->device)->scsi_level < SCSI_2) { 3114 scmd[0] = QFA_REQUEST_BLOCK; 3115 scmd[4] = 3; 3116 } else { 3117 scmd[0] = READ_POSITION; 3118 if (!logical && !STp->scsi2_logical) 3119 scmd[1] = 1; 3120 } 3121 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3122 STp->device->request_queue->rq_timeout, 3123 MAX_READY_RETRIES, 1); 3124 if (!SRpnt) 3125 return (STp->buffer)->syscall_result; 3126 3127 if ((STp->buffer)->syscall_result != 0 || 3128 (STp->device->scsi_level >= SCSI_2 && 3129 ((STp->buffer)->b_data[0] & 4) != 0)) { 3130 *block = *partition = 0; 3131 DEBC_printk(STp, " Can't read tape position.\n"); 3132 result = (-EIO); 3133 } else { 3134 result = 0; 3135 if ((STp->device)->scsi_level < SCSI_2) { 3136 *block = ((STp->buffer)->b_data[0] << 16) 3137 + ((STp->buffer)->b_data[1] << 8) 3138 + (STp->buffer)->b_data[2]; 3139 *partition = 0; 3140 } else { 3141 *block = ((STp->buffer)->b_data[4] << 24) 3142 + ((STp->buffer)->b_data[5] << 16) 3143 + ((STp->buffer)->b_data[6] << 8) 3144 + (STp->buffer)->b_data[7]; 3145 *partition = (STp->buffer)->b_data[1]; 3146 if (((STp->buffer)->b_data[0] & 0x80) && 3147 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3148 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3149 } 3150 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3151 *block, *partition); 3152 } 3153 st_release_request(SRpnt); 3154 SRpnt = NULL; 3155 3156 return result; 3157 } 3158 3159 3160 /* Set the tape block and partition. Negative partition means that only the 3161 block should be set in vendor specific way. */ 3162 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3163 int logical) 3164 { 3165 struct st_partstat *STps; 3166 int result, p; 3167 unsigned int blk; 3168 int timeout; 3169 unsigned char scmd[MAX_COMMAND_SIZE]; 3170 struct st_request *SRpnt; 3171 3172 if (STp->ready != ST_READY) 3173 return (-EIO); 3174 timeout = STp->long_timeout; 3175 STps = &(STp->ps[STp->partition]); 3176 3177 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3178 block, partition); 3179 DEB(if (partition < 0) 3180 return (-EIO); ) 3181 3182 /* Update the location at the partition we are leaving */ 3183 if ((!STp->can_partitions && partition != 0) || 3184 partition >= ST_NBR_PARTITIONS) 3185 return (-EINVAL); 3186 if (partition != STp->partition) { 3187 if (get_location(STp, &blk, &p, 1)) 3188 STps->last_block_valid = 0; 3189 else { 3190 STps->last_block_valid = 1; 3191 STps->last_block_visited = blk; 3192 DEBC_printk(STp, "Visited block %d for " 3193 "partition %d saved.\n", 3194 blk, STp->partition); 3195 } 3196 } 3197 3198 memset(scmd, 0, MAX_COMMAND_SIZE); 3199 if ((STp->device)->scsi_level < SCSI_2) { 3200 scmd[0] = QFA_SEEK_BLOCK; 3201 scmd[2] = (block >> 16); 3202 scmd[3] = (block >> 8); 3203 scmd[4] = block; 3204 scmd[5] = 0; 3205 } else { 3206 scmd[0] = SEEK_10; 3207 scmd[3] = (block >> 24); 3208 scmd[4] = (block >> 16); 3209 scmd[5] = (block >> 8); 3210 scmd[6] = block; 3211 if (!logical && !STp->scsi2_logical) 3212 scmd[1] = 4; 3213 if (STp->partition != partition) { 3214 scmd[1] |= 2; 3215 scmd[8] = partition; 3216 DEBC_printk(STp, "Trying to change partition " 3217 "from %d to %d\n", STp->partition, 3218 partition); 3219 } 3220 } 3221 if (STp->immediate) { 3222 scmd[1] |= 1; /* Don't wait for completion */ 3223 timeout = STp->device->request_queue->rq_timeout; 3224 } 3225 3226 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3227 timeout, MAX_READY_RETRIES, 1); 3228 if (!SRpnt) 3229 return (STp->buffer)->syscall_result; 3230 3231 STps->drv_block = STps->drv_file = (-1); 3232 STps->eof = ST_NOEOF; 3233 if ((STp->buffer)->syscall_result != 0) { 3234 result = (-EIO); 3235 if (STp->can_partitions && 3236 (STp->device)->scsi_level >= SCSI_2 && 3237 (p = find_partition(STp)) >= 0) 3238 STp->partition = p; 3239 } else { 3240 if (STp->can_partitions) { 3241 STp->partition = partition; 3242 STps = &(STp->ps[partition]); 3243 if (!STps->last_block_valid || 3244 STps->last_block_visited != block) { 3245 STps->at_sm = 0; 3246 STps->rw = ST_IDLE; 3247 } 3248 } else 3249 STps->at_sm = 0; 3250 if (block == 0) 3251 STps->drv_block = STps->drv_file = 0; 3252 result = 0; 3253 } 3254 3255 st_release_request(SRpnt); 3256 SRpnt = NULL; 3257 3258 return result; 3259 } 3260 3261 3262 /* Find the current partition number for the drive status. Called from open and 3263 returns either partition number of negative error code. */ 3264 static int find_partition(struct scsi_tape *STp) 3265 { 3266 int i, partition; 3267 unsigned int block; 3268 3269 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3270 return i; 3271 if (partition >= ST_NBR_PARTITIONS) 3272 return (-EIO); 3273 return partition; 3274 } 3275 3276 3277 /* Change the partition if necessary */ 3278 static int switch_partition(struct scsi_tape *STp) 3279 { 3280 struct st_partstat *STps; 3281 3282 if (STp->partition == STp->new_partition) 3283 return 0; 3284 STps = &(STp->ps[STp->new_partition]); 3285 if (!STps->last_block_valid) 3286 STps->last_block_visited = 0; 3287 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3288 } 3289 3290 /* Functions for reading and writing the medium partition mode page. */ 3291 3292 #define PART_PAGE 0x11 3293 #define PART_PAGE_FIXED_LENGTH 8 3294 3295 #define PP_OFF_MAX_ADD_PARTS 2 3296 #define PP_OFF_NBR_ADD_PARTS 3 3297 #define PP_OFF_FLAGS 4 3298 #define PP_OFF_PART_UNITS 6 3299 #define PP_OFF_RESERVED 7 3300 3301 #define PP_BIT_IDP 0x20 3302 #define PP_BIT_FDP 0x80 3303 #define PP_MSK_PSUM_MB 0x10 3304 #define PP_MSK_PSUM_UNITS 0x18 3305 #define PP_MSK_POFM 0x04 3306 3307 /* Get the number of partitions on the tape. As a side effect reads the 3308 mode page into the tape buffer. */ 3309 static int nbr_partitions(struct scsi_tape *STp) 3310 { 3311 int result; 3312 3313 if (STp->ready != ST_READY) 3314 return (-EIO); 3315 3316 result = read_mode_page(STp, PART_PAGE, 1); 3317 3318 if (result) { 3319 DEBC_printk(STp, "Can't read medium partition page.\n"); 3320 result = (-EIO); 3321 } else { 3322 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3323 PP_OFF_NBR_ADD_PARTS] + 1; 3324 DEBC_printk(STp, "Number of partitions %d.\n", result); 3325 } 3326 3327 return result; 3328 } 3329 3330 3331 static int format_medium(struct scsi_tape *STp, int format) 3332 { 3333 int result = 0; 3334 int timeout = STp->long_timeout; 3335 unsigned char scmd[MAX_COMMAND_SIZE]; 3336 struct st_request *SRpnt; 3337 3338 memset(scmd, 0, MAX_COMMAND_SIZE); 3339 scmd[0] = FORMAT_UNIT; 3340 scmd[2] = format; 3341 if (STp->immediate) { 3342 scmd[1] |= 1; /* Don't wait for completion */ 3343 timeout = STp->device->request_queue->rq_timeout; 3344 } 3345 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3346 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3347 timeout, MAX_RETRIES, 1); 3348 if (!SRpnt) 3349 result = STp->buffer->syscall_result; 3350 return result; 3351 } 3352 3353 3354 /* Partition the tape into two partitions if size > 0 or one partition if 3355 size == 0. 3356 3357 The block descriptors are read and written because Sony SDT-7000 does not 3358 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3359 3360 My HP C1533A drive returns only one partition size field. This is used to 3361 set the size of partition 1. There is no size field for the default partition. 3362 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3363 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3364 The following algorithm is used to accommodate both drives: if the number of 3365 partition size fields is greater than the maximum number of additional partitions 3366 in the mode page, the second field is used. Otherwise the first field is used. 3367 3368 For Seagate DDS drives the page length must be 8 when no partitions is defined 3369 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3370 is acceptable also to some other old drives and enforced if the first partition 3371 size field is used for the first additional partition size. 3372 3373 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3374 */ 3375 static int partition_tape(struct scsi_tape *STp, int size) 3376 { 3377 int result; 3378 int target_partition; 3379 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3380 int pgo, psd_cnt, psdo; 3381 int psum = PP_MSK_PSUM_MB, units = 0; 3382 unsigned char *bp; 3383 3384 result = read_mode_page(STp, PART_PAGE, 0); 3385 if (result) { 3386 DEBC_printk(STp, "Can't read partition mode page.\n"); 3387 return result; 3388 } 3389 target_partition = 1; 3390 if (size < 0) { 3391 target_partition = 0; 3392 size = -size; 3393 } 3394 3395 /* The mode page is in the buffer. Let's modify it and write it. */ 3396 bp = (STp->buffer)->b_data; 3397 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3398 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3399 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3400 3401 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3402 3403 if (scsi3) { 3404 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3405 if (needs_format && size == 0) { 3406 /* No need to write the mode page when clearing 3407 * partitioning 3408 */ 3409 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3410 result = format_medium(STp, 0); 3411 goto out; 3412 } 3413 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3414 psd_cnt = 2; 3415 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3416 /* Use units scaling for large partitions if the device 3417 * suggests it and no precision lost. Required for IBM 3418 * TS1140/50 drives that don't support MB units. 3419 */ 3420 if (size >= 1000 && (size % 1000) == 0) { 3421 size /= 1000; 3422 psum = PP_MSK_PSUM_UNITS; 3423 units = 9; /* GB */ 3424 } 3425 } 3426 /* Try it anyway if too large to specify in MB */ 3427 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3428 size /= 1000; 3429 psum = PP_MSK_PSUM_UNITS; 3430 units = 9; /* GB */ 3431 } 3432 } 3433 3434 if (size >= 65535 || /* Does not fit into two bytes */ 3435 (target_partition == 0 && psd_cnt < 2)) { 3436 result = -EINVAL; 3437 goto out; 3438 } 3439 3440 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3441 /* The second condition is for HP DDS which use only one partition size 3442 * descriptor 3443 */ 3444 if (target_partition > 0 && 3445 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3446 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3447 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3448 psdo += 2; 3449 } 3450 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3451 3452 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3453 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3454 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3455 3456 if (size == 0) { 3457 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3458 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3459 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3460 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3461 } else { 3462 bp[psdo] = (size >> 8) & 0xff; 3463 bp[psdo + 1] = size & 0xff; 3464 if (target_partition == 0) 3465 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3466 bp[pgo + 3] = 1; 3467 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3468 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3469 DEBC_printk(STp, 3470 "Formatting tape with two partitions (%i = %d MB).\n", 3471 target_partition, units > 0 ? size * 1000 : size); 3472 } 3473 bp[pgo + PP_OFF_PART_UNITS] = 0; 3474 bp[pgo + PP_OFF_RESERVED] = 0; 3475 if (size != 1 || units != 0) { 3476 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3477 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3478 bp[pgo + PP_OFF_PART_UNITS] = units; 3479 } else 3480 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3481 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3482 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3483 3484 result = write_mode_page(STp, PART_PAGE, 1); 3485 3486 if (!result && needs_format) 3487 result = format_medium(STp, 1); 3488 3489 if (result) { 3490 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3491 result = (-EIO); 3492 } 3493 3494 out: 3495 return result; 3496 } 3497 3498 3499 3500 /* The ioctl command */ 3501 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3502 { 3503 int i, cmd_nr, cmd_type, bt; 3504 int retval = 0; 3505 unsigned int blk; 3506 struct scsi_tape *STp = file->private_data; 3507 struct st_modedef *STm; 3508 struct st_partstat *STps; 3509 void __user *p = (void __user *)arg; 3510 3511 if (mutex_lock_interruptible(&STp->lock)) 3512 return -ERESTARTSYS; 3513 3514 DEB( 3515 if (debugging && !STp->in_use) { 3516 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3517 retval = (-EIO); 3518 goto out; 3519 } ) /* end DEB */ 3520 3521 STm = &(STp->modes[STp->current_mode]); 3522 STps = &(STp->ps[STp->partition]); 3523 3524 /* 3525 * If we are in the middle of error recovery, don't let anyone 3526 * else try and use this device. Also, if error recovery fails, it 3527 * may try and take the device offline, in which case all further 3528 * access to the device is prohibited. 3529 */ 3530 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3531 file->f_flags & O_NDELAY); 3532 if (retval) 3533 goto out; 3534 3535 cmd_type = _IOC_TYPE(cmd_in); 3536 cmd_nr = _IOC_NR(cmd_in); 3537 3538 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3539 struct mtop mtc; 3540 3541 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3542 retval = (-EINVAL); 3543 goto out; 3544 } 3545 3546 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3547 if (i) { 3548 retval = (-EFAULT); 3549 goto out; 3550 } 3551 3552 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3553 st_printk(KERN_WARNING, STp, 3554 "MTSETDRVBUFFER only allowed for root.\n"); 3555 retval = (-EPERM); 3556 goto out; 3557 } 3558 if (!STm->defined && 3559 (mtc.mt_op != MTSETDRVBUFFER && 3560 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3561 retval = (-ENXIO); 3562 goto out; 3563 } 3564 3565 if (!STp->pos_unknown) { 3566 3567 if (STps->eof == ST_FM_HIT) { 3568 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3569 mtc.mt_op == MTEOM) { 3570 mtc.mt_count -= 1; 3571 if (STps->drv_file >= 0) 3572 STps->drv_file += 1; 3573 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3574 mtc.mt_count += 1; 3575 if (STps->drv_file >= 0) 3576 STps->drv_file += 1; 3577 } 3578 } 3579 3580 if (mtc.mt_op == MTSEEK) { 3581 /* Old position must be restored if partition will be 3582 changed */ 3583 i = !STp->can_partitions || 3584 (STp->new_partition != STp->partition); 3585 } else { 3586 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3587 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3588 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3589 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3590 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3591 mtc.mt_op == MTCOMPRESSION; 3592 } 3593 i = flush_buffer(STp, i); 3594 if (i < 0) { 3595 retval = i; 3596 goto out; 3597 } 3598 if (STps->rw == ST_WRITING && 3599 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3600 mtc.mt_op == MTSEEK || 3601 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3602 i = st_int_ioctl(STp, MTWEOF, 1); 3603 if (i < 0) { 3604 retval = i; 3605 goto out; 3606 } 3607 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3608 mtc.mt_count++; 3609 STps->rw = ST_IDLE; 3610 } 3611 3612 } else { 3613 /* 3614 * If there was a bus reset, block further access 3615 * to this device. If the user wants to rewind the tape, 3616 * then reset the flag and allow access again. 3617 */ 3618 if (mtc.mt_op != MTREW && 3619 mtc.mt_op != MTOFFL && 3620 mtc.mt_op != MTRETEN && 3621 mtc.mt_op != MTERASE && 3622 mtc.mt_op != MTSEEK && 3623 mtc.mt_op != MTEOM) { 3624 retval = (-EIO); 3625 goto out; 3626 } 3627 reset_state(STp); 3628 /* remove this when the midlevel properly clears was_reset */ 3629 STp->device->was_reset = 0; 3630 } 3631 3632 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3633 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3634 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3635 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3636 3637 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3638 do_door_lock(STp, 0); /* Ignore result! */ 3639 3640 if (mtc.mt_op == MTSETDRVBUFFER && 3641 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3642 retval = st_set_options(STp, mtc.mt_count); 3643 goto out; 3644 } 3645 3646 if (mtc.mt_op == MTSETPART) { 3647 if (!STp->can_partitions || 3648 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3649 retval = (-EINVAL); 3650 goto out; 3651 } 3652 if (mtc.mt_count >= STp->nbr_partitions && 3653 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3654 retval = (-EIO); 3655 goto out; 3656 } 3657 if (mtc.mt_count >= STp->nbr_partitions) { 3658 retval = (-EINVAL); 3659 goto out; 3660 } 3661 STp->new_partition = mtc.mt_count; 3662 retval = 0; 3663 goto out; 3664 } 3665 3666 if (mtc.mt_op == MTMKPART) { 3667 if (!STp->can_partitions) { 3668 retval = (-EINVAL); 3669 goto out; 3670 } 3671 i = do_load_unload(STp, file, 1); 3672 if (i < 0) { 3673 retval = i; 3674 goto out; 3675 } 3676 i = partition_tape(STp, mtc.mt_count); 3677 if (i < 0) { 3678 retval = i; 3679 goto out; 3680 } 3681 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3682 STp->ps[i].rw = ST_IDLE; 3683 STp->ps[i].at_sm = 0; 3684 STp->ps[i].last_block_valid = 0; 3685 } 3686 STp->partition = STp->new_partition = 0; 3687 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3688 STps->drv_block = STps->drv_file = 0; 3689 retval = 0; 3690 goto out; 3691 } 3692 3693 if (mtc.mt_op == MTSEEK) { 3694 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3695 if (!STp->can_partitions) 3696 STp->ps[0].rw = ST_IDLE; 3697 retval = i; 3698 goto out; 3699 } 3700 3701 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3702 retval = do_load_unload(STp, file, 0); 3703 goto out; 3704 } 3705 3706 if (mtc.mt_op == MTLOAD) { 3707 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3708 goto out; 3709 } 3710 3711 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3712 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3713 goto out; 3714 } 3715 3716 if (STp->can_partitions && STp->ready == ST_READY && 3717 (i = switch_partition(STp)) < 0) { 3718 retval = i; 3719 goto out; 3720 } 3721 3722 if (mtc.mt_op == MTCOMPRESSION) 3723 retval = st_compression(STp, (mtc.mt_count & 1)); 3724 else 3725 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3726 goto out; 3727 } 3728 if (!STm->defined) { 3729 retval = (-ENXIO); 3730 goto out; 3731 } 3732 3733 if ((i = flush_buffer(STp, 0)) < 0) { 3734 retval = i; 3735 goto out; 3736 } 3737 if (STp->can_partitions && 3738 (i = switch_partition(STp)) < 0) { 3739 retval = i; 3740 goto out; 3741 } 3742 3743 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3744 struct mtget mt_status; 3745 3746 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3747 retval = (-EINVAL); 3748 goto out; 3749 } 3750 3751 mt_status.mt_type = STp->tape_type; 3752 mt_status.mt_dsreg = 3753 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3754 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3755 mt_status.mt_blkno = STps->drv_block; 3756 mt_status.mt_fileno = STps->drv_file; 3757 if (STp->block_size != 0) { 3758 if (STps->rw == ST_WRITING) 3759 mt_status.mt_blkno += 3760 (STp->buffer)->buffer_bytes / STp->block_size; 3761 else if (STps->rw == ST_READING) 3762 mt_status.mt_blkno -= 3763 ((STp->buffer)->buffer_bytes + 3764 STp->block_size - 1) / STp->block_size; 3765 } 3766 3767 mt_status.mt_gstat = 0; 3768 if (STp->drv_write_prot) 3769 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3770 if (mt_status.mt_blkno == 0) { 3771 if (mt_status.mt_fileno == 0) 3772 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3773 else 3774 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3775 } 3776 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3777 mt_status.mt_resid = STp->partition; 3778 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3779 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3780 else if (STps->eof >= ST_EOM_OK) 3781 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3782 if (STp->density == 1) 3783 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3784 else if (STp->density == 2) 3785 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3786 else if (STp->density == 3) 3787 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3788 if (STp->ready == ST_READY) 3789 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3790 if (STp->ready == ST_NO_TAPE) 3791 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3792 if (STps->at_sm) 3793 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3794 if (STm->do_async_writes || 3795 (STm->do_buffer_writes && STp->block_size != 0) || 3796 STp->drv_buffer != 0) 3797 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3798 if (STp->cleaning_req) 3799 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3800 3801 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3802 if (i) { 3803 retval = (-EFAULT); 3804 goto out; 3805 } 3806 3807 STp->recover_reg = 0; /* Clear after read */ 3808 retval = 0; 3809 goto out; 3810 } /* End of MTIOCGET */ 3811 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3812 struct mtpos mt_pos; 3813 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3814 retval = (-EINVAL); 3815 goto out; 3816 } 3817 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3818 retval = i; 3819 goto out; 3820 } 3821 mt_pos.mt_blkno = blk; 3822 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3823 if (i) 3824 retval = (-EFAULT); 3825 goto out; 3826 } 3827 mutex_unlock(&STp->lock); 3828 switch (cmd_in) { 3829 case SCSI_IOCTL_GET_IDLUN: 3830 case SCSI_IOCTL_GET_BUS_NUMBER: 3831 break; 3832 default: 3833 if ((cmd_in == SG_IO || 3834 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3835 cmd_in == CDROM_SEND_PACKET) && 3836 !capable(CAP_SYS_RAWIO)) 3837 i = -EPERM; 3838 else 3839 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3840 file->f_mode, cmd_in, p); 3841 if (i != -ENOTTY) 3842 return i; 3843 break; 3844 } 3845 retval = scsi_ioctl(STp->device, cmd_in, p); 3846 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3847 STp->rew_at_close = 0; 3848 STp->ready = ST_NO_TAPE; 3849 } 3850 return retval; 3851 3852 out: 3853 mutex_unlock(&STp->lock); 3854 return retval; 3855 } 3856 3857 #ifdef CONFIG_COMPAT 3858 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3859 { 3860 struct scsi_tape *STp = file->private_data; 3861 struct scsi_device *sdev = STp->device; 3862 int ret = -ENOIOCTLCMD; 3863 if (sdev->host->hostt->compat_ioctl) { 3864 3865 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3866 3867 } 3868 return ret; 3869 } 3870 #endif 3871 3872 3873 3874 /* Try to allocate a new tape buffer. Calling function must not hold 3875 dev_arr_lock. */ 3876 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3877 { 3878 struct st_buffer *tb; 3879 3880 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); 3881 if (!tb) { 3882 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3883 return NULL; 3884 } 3885 tb->frp_segs = 0; 3886 tb->use_sg = max_sg; 3887 tb->dma = need_dma; 3888 tb->buffer_size = 0; 3889 3890 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), 3891 GFP_ATOMIC); 3892 if (!tb->reserved_pages) { 3893 kfree(tb); 3894 return NULL; 3895 } 3896 3897 return tb; 3898 } 3899 3900 3901 /* Try to allocate enough space in the tape buffer */ 3902 #define ST_MAX_ORDER 6 3903 3904 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3905 { 3906 int segs, max_segs, b_size, order, got; 3907 gfp_t priority; 3908 3909 if (new_size <= STbuffer->buffer_size) 3910 return 1; 3911 3912 if (STbuffer->buffer_size <= PAGE_SIZE) 3913 normalize_buffer(STbuffer); /* Avoid extra segment */ 3914 3915 max_segs = STbuffer->use_sg; 3916 3917 priority = GFP_KERNEL | __GFP_NOWARN; 3918 if (need_dma) 3919 priority |= GFP_DMA; 3920 3921 if (STbuffer->cleared) 3922 priority |= __GFP_ZERO; 3923 3924 if (STbuffer->frp_segs) { 3925 order = STbuffer->reserved_page_order; 3926 b_size = PAGE_SIZE << order; 3927 } else { 3928 for (b_size = PAGE_SIZE, order = 0; 3929 order < ST_MAX_ORDER && 3930 max_segs * (PAGE_SIZE << order) < new_size; 3931 order++, b_size *= 2) 3932 ; /* empty */ 3933 STbuffer->reserved_page_order = order; 3934 } 3935 if (max_segs * (PAGE_SIZE << order) < new_size) { 3936 if (order == ST_MAX_ORDER) 3937 return 0; 3938 normalize_buffer(STbuffer); 3939 return enlarge_buffer(STbuffer, new_size, need_dma); 3940 } 3941 3942 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3943 segs < max_segs && got < new_size;) { 3944 struct page *page; 3945 3946 page = alloc_pages(priority, order); 3947 if (!page) { 3948 DEB(STbuffer->buffer_size = got); 3949 normalize_buffer(STbuffer); 3950 return 0; 3951 } 3952 3953 STbuffer->frp_segs += 1; 3954 got += b_size; 3955 STbuffer->buffer_size = got; 3956 STbuffer->reserved_pages[segs] = page; 3957 segs++; 3958 } 3959 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3960 3961 return 1; 3962 } 3963 3964 3965 /* Make sure that no data from previous user is in the internal buffer */ 3966 static void clear_buffer(struct st_buffer * st_bp) 3967 { 3968 int i; 3969 3970 for (i=0; i < st_bp->frp_segs; i++) 3971 memset(page_address(st_bp->reserved_pages[i]), 0, 3972 PAGE_SIZE << st_bp->reserved_page_order); 3973 st_bp->cleared = 1; 3974 } 3975 3976 3977 /* Release the extra buffer */ 3978 static void normalize_buffer(struct st_buffer * STbuffer) 3979 { 3980 int i, order = STbuffer->reserved_page_order; 3981 3982 for (i = 0; i < STbuffer->frp_segs; i++) { 3983 __free_pages(STbuffer->reserved_pages[i], order); 3984 STbuffer->buffer_size -= (PAGE_SIZE << order); 3985 } 3986 STbuffer->frp_segs = 0; 3987 STbuffer->sg_segs = 0; 3988 STbuffer->reserved_page_order = 0; 3989 STbuffer->map_data.offset = 0; 3990 } 3991 3992 3993 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3994 negative error code. */ 3995 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3996 { 3997 int i, cnt, res, offset; 3998 int length = PAGE_SIZE << st_bp->reserved_page_order; 3999 4000 for (i = 0, offset = st_bp->buffer_bytes; 4001 i < st_bp->frp_segs && offset >= length; i++) 4002 offset -= length; 4003 if (i == st_bp->frp_segs) { /* Should never happen */ 4004 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4005 return (-EIO); 4006 } 4007 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4008 struct page *page = st_bp->reserved_pages[i]; 4009 cnt = length - offset < do_count ? length - offset : do_count; 4010 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4011 if (res) 4012 return (-EFAULT); 4013 do_count -= cnt; 4014 st_bp->buffer_bytes += cnt; 4015 ubp += cnt; 4016 offset = 0; 4017 } 4018 if (do_count) /* Should never happen */ 4019 return (-EIO); 4020 4021 return 0; 4022 } 4023 4024 4025 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4026 negative error code. */ 4027 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4028 { 4029 int i, cnt, res, offset; 4030 int length = PAGE_SIZE << st_bp->reserved_page_order; 4031 4032 for (i = 0, offset = st_bp->read_pointer; 4033 i < st_bp->frp_segs && offset >= length; i++) 4034 offset -= length; 4035 if (i == st_bp->frp_segs) { /* Should never happen */ 4036 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4037 return (-EIO); 4038 } 4039 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4040 struct page *page = st_bp->reserved_pages[i]; 4041 cnt = length - offset < do_count ? length - offset : do_count; 4042 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4043 if (res) 4044 return (-EFAULT); 4045 do_count -= cnt; 4046 st_bp->buffer_bytes -= cnt; 4047 st_bp->read_pointer += cnt; 4048 ubp += cnt; 4049 offset = 0; 4050 } 4051 if (do_count) /* Should never happen */ 4052 return (-EIO); 4053 4054 return 0; 4055 } 4056 4057 4058 /* Move data towards start of buffer */ 4059 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4060 { 4061 int src_seg, dst_seg, src_offset = 0, dst_offset; 4062 int count, total; 4063 int length = PAGE_SIZE << st_bp->reserved_page_order; 4064 4065 if (offset == 0) 4066 return; 4067 4068 total=st_bp->buffer_bytes - offset; 4069 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4070 src_offset = offset; 4071 if (src_offset < length) 4072 break; 4073 offset -= length; 4074 } 4075 4076 st_bp->buffer_bytes = st_bp->read_pointer = total; 4077 for (dst_seg=dst_offset=0; total > 0; ) { 4078 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4079 struct page *spage = st_bp->reserved_pages[src_seg]; 4080 4081 count = min(length - dst_offset, length - src_offset); 4082 memmove(page_address(dpage) + dst_offset, 4083 page_address(spage) + src_offset, count); 4084 src_offset += count; 4085 if (src_offset >= length) { 4086 src_seg++; 4087 src_offset = 0; 4088 } 4089 dst_offset += count; 4090 if (dst_offset >= length) { 4091 dst_seg++; 4092 dst_offset = 0; 4093 } 4094 total -= count; 4095 } 4096 } 4097 4098 /* Validate the options from command line or module parameters */ 4099 static void validate_options(void) 4100 { 4101 if (buffer_kbs > 0) 4102 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4103 if (max_sg_segs >= ST_FIRST_SG) 4104 st_max_sg_segs = max_sg_segs; 4105 } 4106 4107 #ifndef MODULE 4108 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4109 */ 4110 static int __init st_setup(char *str) 4111 { 4112 int i, len, ints[5]; 4113 char *stp; 4114 4115 stp = get_options(str, ARRAY_SIZE(ints), ints); 4116 4117 if (ints[0] > 0) { 4118 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4119 if (parms[i].val) 4120 *parms[i].val = ints[i + 1]; 4121 } else { 4122 while (stp != NULL) { 4123 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4124 len = strlen(parms[i].name); 4125 if (!strncmp(stp, parms[i].name, len) && 4126 (*(stp + len) == ':' || *(stp + len) == '=')) { 4127 if (parms[i].val) 4128 *parms[i].val = 4129 simple_strtoul(stp + len + 1, NULL, 0); 4130 else 4131 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4132 parms[i].name); 4133 break; 4134 } 4135 } 4136 if (i >= ARRAY_SIZE(parms)) 4137 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4138 stp); 4139 stp = strchr(stp, ','); 4140 if (stp) 4141 stp++; 4142 } 4143 } 4144 4145 validate_options(); 4146 4147 return 1; 4148 } 4149 4150 __setup("st=", st_setup); 4151 4152 #endif 4153 4154 static const struct file_operations st_fops = 4155 { 4156 .owner = THIS_MODULE, 4157 .read = st_read, 4158 .write = st_write, 4159 .unlocked_ioctl = st_ioctl, 4160 #ifdef CONFIG_COMPAT 4161 .compat_ioctl = st_compat_ioctl, 4162 #endif 4163 .open = st_open, 4164 .flush = st_flush, 4165 .release = st_release, 4166 .llseek = noop_llseek, 4167 }; 4168 4169 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4170 { 4171 int i, error; 4172 dev_t cdev_devno; 4173 struct cdev *cdev; 4174 struct device *dev; 4175 struct st_modedef *STm = &(tape->modes[mode]); 4176 char name[10]; 4177 int dev_num = tape->index; 4178 4179 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4180 4181 cdev = cdev_alloc(); 4182 if (!cdev) { 4183 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4184 error = -ENOMEM; 4185 goto out; 4186 } 4187 cdev->owner = THIS_MODULE; 4188 cdev->ops = &st_fops; 4189 STm->cdevs[rew] = cdev; 4190 4191 error = cdev_add(cdev, cdev_devno, 1); 4192 if (error) { 4193 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4194 rew ? "non" : "auto", mode); 4195 pr_err("st%d: Device not attached.\n", dev_num); 4196 goto out_free; 4197 } 4198 4199 i = mode << (4 - ST_NBR_MODE_BITS); 4200 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4201 tape->disk->disk_name, st_formats[i]); 4202 4203 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4204 cdev_devno, &tape->modes[mode], "%s", name); 4205 if (IS_ERR(dev)) { 4206 pr_err("st%d: device_create failed\n", dev_num); 4207 error = PTR_ERR(dev); 4208 goto out_free; 4209 } 4210 4211 STm->devs[rew] = dev; 4212 4213 return 0; 4214 out_free: 4215 cdev_del(STm->cdevs[rew]); 4216 out: 4217 STm->cdevs[rew] = NULL; 4218 STm->devs[rew] = NULL; 4219 return error; 4220 } 4221 4222 static int create_cdevs(struct scsi_tape *tape) 4223 { 4224 int mode, error; 4225 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4226 error = create_one_cdev(tape, mode, 0); 4227 if (error) 4228 return error; 4229 error = create_one_cdev(tape, mode, 1); 4230 if (error) 4231 return error; 4232 } 4233 4234 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4235 &tape->modes[0].devs[0]->kobj, "tape"); 4236 } 4237 4238 static void remove_cdevs(struct scsi_tape *tape) 4239 { 4240 int mode, rew; 4241 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4242 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4243 struct st_modedef *STm = &(tape->modes[mode]); 4244 for (rew = 0; rew < 2; rew++) { 4245 if (STm->cdevs[rew]) 4246 cdev_del(STm->cdevs[rew]); 4247 if (STm->devs[rew]) 4248 device_unregister(STm->devs[rew]); 4249 } 4250 } 4251 } 4252 4253 static int st_probe(struct device *dev) 4254 { 4255 struct scsi_device *SDp = to_scsi_device(dev); 4256 struct gendisk *disk = NULL; 4257 struct scsi_tape *tpnt = NULL; 4258 struct st_modedef *STm; 4259 struct st_partstat *STps; 4260 struct st_buffer *buffer; 4261 int i, error; 4262 char *stp; 4263 4264 if (SDp->type != TYPE_TAPE) 4265 return -ENODEV; 4266 if ((stp = st_incompatible(SDp))) { 4267 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4268 sdev_printk(KERN_INFO, SDp, 4269 "st: The suggested driver is %s.\n", stp); 4270 return -ENODEV; 4271 } 4272 4273 scsi_autopm_get_device(SDp); 4274 i = queue_max_segments(SDp->request_queue); 4275 if (st_max_sg_segs < i) 4276 i = st_max_sg_segs; 4277 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4278 if (buffer == NULL) { 4279 sdev_printk(KERN_ERR, SDp, 4280 "st: Can't allocate new tape buffer. " 4281 "Device not attached.\n"); 4282 goto out; 4283 } 4284 4285 disk = alloc_disk(1); 4286 if (!disk) { 4287 sdev_printk(KERN_ERR, SDp, 4288 "st: out of memory. Device not attached.\n"); 4289 goto out_buffer_free; 4290 } 4291 4292 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); 4293 if (tpnt == NULL) { 4294 sdev_printk(KERN_ERR, SDp, 4295 "st: Can't allocate device descriptor.\n"); 4296 goto out_put_disk; 4297 } 4298 kref_init(&tpnt->kref); 4299 tpnt->disk = disk; 4300 disk->private_data = &tpnt->driver; 4301 disk->queue = SDp->request_queue; 4302 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4303 * take queue reference that release_disk() expects. */ 4304 if (!blk_get_queue(disk->queue)) 4305 goto out_put_disk; 4306 tpnt->driver = &st_template; 4307 4308 tpnt->device = SDp; 4309 if (SDp->scsi_level <= 2) 4310 tpnt->tape_type = MT_ISSCSI1; 4311 else 4312 tpnt->tape_type = MT_ISSCSI2; 4313 4314 tpnt->buffer = buffer; 4315 tpnt->buffer->last_SRpnt = NULL; 4316 4317 tpnt->inited = 0; 4318 tpnt->dirty = 0; 4319 tpnt->in_use = 0; 4320 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4321 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4322 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4323 tpnt->density = 0; 4324 tpnt->do_auto_lock = ST_AUTO_LOCK; 4325 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4326 tpnt->can_partitions = 0; 4327 tpnt->two_fm = ST_TWO_FM; 4328 tpnt->fast_mteom = ST_FAST_MTEOM; 4329 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4330 tpnt->sili = ST_SILI; 4331 tpnt->immediate = ST_NOWAIT; 4332 tpnt->immediate_filemark = 0; 4333 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4334 tpnt->partition = 0; 4335 tpnt->new_partition = 0; 4336 tpnt->nbr_partitions = 0; 4337 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4338 tpnt->long_timeout = ST_LONG_TIMEOUT; 4339 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4340 4341 for (i = 0; i < ST_NBR_MODES; i++) { 4342 STm = &(tpnt->modes[i]); 4343 STm->defined = 0; 4344 STm->sysv = ST_SYSV; 4345 STm->defaults_for_writes = 0; 4346 STm->do_async_writes = ST_ASYNC_WRITES; 4347 STm->do_buffer_writes = ST_BUFFER_WRITES; 4348 STm->do_read_ahead = ST_READ_AHEAD; 4349 STm->default_compression = ST_DONT_TOUCH; 4350 STm->default_blksize = (-1); /* No forced size */ 4351 STm->default_density = (-1); /* No forced density */ 4352 STm->tape = tpnt; 4353 } 4354 4355 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4356 STps = &(tpnt->ps[i]); 4357 STps->rw = ST_IDLE; 4358 STps->eof = ST_NOEOF; 4359 STps->at_sm = 0; 4360 STps->last_block_valid = 0; 4361 STps->drv_block = (-1); 4362 STps->drv_file = (-1); 4363 } 4364 4365 tpnt->current_mode = 0; 4366 tpnt->modes[0].defined = 1; 4367 4368 tpnt->density_changed = tpnt->compression_changed = 4369 tpnt->blksize_changed = 0; 4370 mutex_init(&tpnt->lock); 4371 4372 idr_preload(GFP_KERNEL); 4373 spin_lock(&st_index_lock); 4374 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4375 spin_unlock(&st_index_lock); 4376 idr_preload_end(); 4377 if (error < 0) { 4378 pr_warn("st: idr allocation failed: %d\n", error); 4379 goto out_put_queue; 4380 } 4381 tpnt->index = error; 4382 sprintf(disk->disk_name, "st%d", tpnt->index); 4383 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4384 if (tpnt->stats == NULL) { 4385 sdev_printk(KERN_ERR, SDp, 4386 "st: Can't allocate statistics.\n"); 4387 goto out_idr_remove; 4388 } 4389 4390 dev_set_drvdata(dev, tpnt); 4391 4392 4393 error = create_cdevs(tpnt); 4394 if (error) 4395 goto out_remove_devs; 4396 scsi_autopm_put_device(SDp); 4397 4398 sdev_printk(KERN_NOTICE, SDp, 4399 "Attached scsi tape %s\n", tape_name(tpnt)); 4400 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4401 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4402 queue_dma_alignment(SDp->request_queue) + 1); 4403 4404 return 0; 4405 4406 out_remove_devs: 4407 remove_cdevs(tpnt); 4408 kfree(tpnt->stats); 4409 out_idr_remove: 4410 spin_lock(&st_index_lock); 4411 idr_remove(&st_index_idr, tpnt->index); 4412 spin_unlock(&st_index_lock); 4413 out_put_queue: 4414 blk_put_queue(disk->queue); 4415 out_put_disk: 4416 put_disk(disk); 4417 kfree(tpnt); 4418 out_buffer_free: 4419 kfree(buffer); 4420 out: 4421 scsi_autopm_put_device(SDp); 4422 return -ENODEV; 4423 }; 4424 4425 4426 static int st_remove(struct device *dev) 4427 { 4428 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4429 int index = tpnt->index; 4430 4431 scsi_autopm_get_device(to_scsi_device(dev)); 4432 remove_cdevs(tpnt); 4433 4434 mutex_lock(&st_ref_mutex); 4435 kref_put(&tpnt->kref, scsi_tape_release); 4436 mutex_unlock(&st_ref_mutex); 4437 spin_lock(&st_index_lock); 4438 idr_remove(&st_index_idr, index); 4439 spin_unlock(&st_index_lock); 4440 return 0; 4441 } 4442 4443 /** 4444 * scsi_tape_release - Called to free the Scsi_Tape structure 4445 * @kref: pointer to embedded kref 4446 * 4447 * st_ref_mutex must be held entering this routine. Because it is 4448 * called on last put, you should always use the scsi_tape_get() 4449 * scsi_tape_put() helpers which manipulate the semaphore directly 4450 * and never do a direct kref_put(). 4451 **/ 4452 static void scsi_tape_release(struct kref *kref) 4453 { 4454 struct scsi_tape *tpnt = to_scsi_tape(kref); 4455 struct gendisk *disk = tpnt->disk; 4456 4457 tpnt->device = NULL; 4458 4459 if (tpnt->buffer) { 4460 normalize_buffer(tpnt->buffer); 4461 kfree(tpnt->buffer->reserved_pages); 4462 kfree(tpnt->buffer); 4463 } 4464 4465 disk->private_data = NULL; 4466 put_disk(disk); 4467 kfree(tpnt->stats); 4468 kfree(tpnt); 4469 return; 4470 } 4471 4472 static struct class st_sysfs_class = { 4473 .name = "scsi_tape", 4474 .dev_groups = st_dev_groups, 4475 }; 4476 4477 static int __init init_st(void) 4478 { 4479 int err; 4480 4481 validate_options(); 4482 4483 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4484 verstr, st_fixed_buffer_size, st_max_sg_segs); 4485 4486 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4487 if (debugging) { 4488 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4489 debugging); 4490 } 4491 4492 err = class_register(&st_sysfs_class); 4493 if (err) { 4494 pr_err("Unable register sysfs class for SCSI tapes\n"); 4495 return err; 4496 } 4497 4498 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4499 ST_MAX_TAPE_ENTRIES, "st"); 4500 if (err) { 4501 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4502 SCSI_TAPE_MAJOR); 4503 goto err_class; 4504 } 4505 4506 err = scsi_register_driver(&st_template.gendrv); 4507 if (err) 4508 goto err_chrdev; 4509 4510 return 0; 4511 4512 err_chrdev: 4513 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4514 ST_MAX_TAPE_ENTRIES); 4515 err_class: 4516 class_unregister(&st_sysfs_class); 4517 return err; 4518 } 4519 4520 static void __exit exit_st(void) 4521 { 4522 scsi_unregister_driver(&st_template.gendrv); 4523 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4524 ST_MAX_TAPE_ENTRIES); 4525 class_unregister(&st_sysfs_class); 4526 idr_destroy(&st_index_idr); 4527 printk(KERN_INFO "st: Unloaded.\n"); 4528 } 4529 4530 module_init(init_st); 4531 module_exit(exit_st); 4532 4533 4534 /* The sysfs driver interface. Read-only at the moment */ 4535 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4536 { 4537 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4538 } 4539 static DRIVER_ATTR_RO(try_direct_io); 4540 4541 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4542 { 4543 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4544 } 4545 static DRIVER_ATTR_RO(fixed_buffer_size); 4546 4547 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4548 { 4549 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4550 } 4551 static DRIVER_ATTR_RO(max_sg_segs); 4552 4553 static ssize_t version_show(struct device_driver *ddd, char *buf) 4554 { 4555 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4556 } 4557 static DRIVER_ATTR_RO(version); 4558 4559 #if DEBUG 4560 static ssize_t debug_flag_store(struct device_driver *ddp, 4561 const char *buf, size_t count) 4562 { 4563 /* We only care what the first byte of the data is the rest is unused. 4564 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4565 * other values have -EINVAL returned if they are passed in. 4566 */ 4567 if (count > 0) { 4568 if (buf[0] == '0') { 4569 debugging = NO_DEBUG; 4570 return count; 4571 } else if (buf[0] == '1') { 4572 debugging = 1; 4573 return count; 4574 } 4575 } 4576 return -EINVAL; 4577 } 4578 4579 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4580 { 4581 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4582 } 4583 static DRIVER_ATTR_RW(debug_flag); 4584 #endif 4585 4586 static struct attribute *st_drv_attrs[] = { 4587 &driver_attr_try_direct_io.attr, 4588 &driver_attr_fixed_buffer_size.attr, 4589 &driver_attr_max_sg_segs.attr, 4590 &driver_attr_version.attr, 4591 #if DEBUG 4592 &driver_attr_debug_flag.attr, 4593 #endif 4594 NULL, 4595 }; 4596 ATTRIBUTE_GROUPS(st_drv); 4597 4598 /* The sysfs simple class interface */ 4599 static ssize_t 4600 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4601 { 4602 struct st_modedef *STm = dev_get_drvdata(dev); 4603 ssize_t l = 0; 4604 4605 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4606 return l; 4607 } 4608 static DEVICE_ATTR_RO(defined); 4609 4610 static ssize_t 4611 default_blksize_show(struct device *dev, struct device_attribute *attr, 4612 char *buf) 4613 { 4614 struct st_modedef *STm = dev_get_drvdata(dev); 4615 ssize_t l = 0; 4616 4617 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4618 return l; 4619 } 4620 static DEVICE_ATTR_RO(default_blksize); 4621 4622 static ssize_t 4623 default_density_show(struct device *dev, struct device_attribute *attr, 4624 char *buf) 4625 { 4626 struct st_modedef *STm = dev_get_drvdata(dev); 4627 ssize_t l = 0; 4628 char *fmt; 4629 4630 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4631 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4632 return l; 4633 } 4634 static DEVICE_ATTR_RO(default_density); 4635 4636 static ssize_t 4637 default_compression_show(struct device *dev, struct device_attribute *attr, 4638 char *buf) 4639 { 4640 struct st_modedef *STm = dev_get_drvdata(dev); 4641 ssize_t l = 0; 4642 4643 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4644 return l; 4645 } 4646 static DEVICE_ATTR_RO(default_compression); 4647 4648 static ssize_t 4649 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4650 { 4651 struct st_modedef *STm = dev_get_drvdata(dev); 4652 struct scsi_tape *STp = STm->tape; 4653 int options; 4654 ssize_t l = 0; 4655 4656 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4657 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4658 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4659 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4660 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4661 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4662 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4663 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4664 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4665 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4666 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4667 options |= STm->sysv ? MT_ST_SYSV : 0; 4668 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4669 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4670 options |= STp->sili ? MT_ST_SILI : 0; 4671 4672 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4673 return l; 4674 } 4675 static DEVICE_ATTR_RO(options); 4676 4677 /* Support for tape stats */ 4678 4679 /** 4680 * read_cnt_show - return read count - count of reads made from tape drive 4681 * @dev: struct device 4682 * @attr: attribute structure 4683 * @buf: buffer to return formatted data in 4684 */ 4685 static ssize_t read_cnt_show(struct device *dev, 4686 struct device_attribute *attr, char *buf) 4687 { 4688 struct st_modedef *STm = dev_get_drvdata(dev); 4689 4690 return sprintf(buf, "%lld", 4691 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4692 } 4693 static DEVICE_ATTR_RO(read_cnt); 4694 4695 /** 4696 * read_byte_cnt_show - return read byte count - tape drives 4697 * may use blocks less than 512 bytes this gives the raw byte count of 4698 * of data read from the tape drive. 4699 * @dev: struct device 4700 * @attr: attribute structure 4701 * @buf: buffer to return formatted data in 4702 */ 4703 static ssize_t read_byte_cnt_show(struct device *dev, 4704 struct device_attribute *attr, char *buf) 4705 { 4706 struct st_modedef *STm = dev_get_drvdata(dev); 4707 4708 return sprintf(buf, "%lld", 4709 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4710 } 4711 static DEVICE_ATTR_RO(read_byte_cnt); 4712 4713 /** 4714 * read_us_show - return read us - overall time spent waiting on reads in ns. 4715 * @dev: struct device 4716 * @attr: attribute structure 4717 * @buf: buffer to return formatted data in 4718 */ 4719 static ssize_t read_ns_show(struct device *dev, 4720 struct device_attribute *attr, char *buf) 4721 { 4722 struct st_modedef *STm = dev_get_drvdata(dev); 4723 4724 return sprintf(buf, "%lld", 4725 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4726 } 4727 static DEVICE_ATTR_RO(read_ns); 4728 4729 /** 4730 * write_cnt_show - write count - number of user calls 4731 * to write(2) that have written data to tape. 4732 * @dev: struct device 4733 * @attr: attribute structure 4734 * @buf: buffer to return formatted data in 4735 */ 4736 static ssize_t write_cnt_show(struct device *dev, 4737 struct device_attribute *attr, char *buf) 4738 { 4739 struct st_modedef *STm = dev_get_drvdata(dev); 4740 4741 return sprintf(buf, "%lld", 4742 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4743 } 4744 static DEVICE_ATTR_RO(write_cnt); 4745 4746 /** 4747 * write_byte_cnt_show - write byte count - raw count of 4748 * bytes written to tape. 4749 * @dev: struct device 4750 * @attr: attribute structure 4751 * @buf: buffer to return formatted data in 4752 */ 4753 static ssize_t write_byte_cnt_show(struct device *dev, 4754 struct device_attribute *attr, char *buf) 4755 { 4756 struct st_modedef *STm = dev_get_drvdata(dev); 4757 4758 return sprintf(buf, "%lld", 4759 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4760 } 4761 static DEVICE_ATTR_RO(write_byte_cnt); 4762 4763 /** 4764 * write_ns_show - write ns - number of nanoseconds waiting on write 4765 * requests to complete. 4766 * @dev: struct device 4767 * @attr: attribute structure 4768 * @buf: buffer to return formatted data in 4769 */ 4770 static ssize_t write_ns_show(struct device *dev, 4771 struct device_attribute *attr, char *buf) 4772 { 4773 struct st_modedef *STm = dev_get_drvdata(dev); 4774 4775 return sprintf(buf, "%lld", 4776 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4777 } 4778 static DEVICE_ATTR_RO(write_ns); 4779 4780 /** 4781 * in_flight_show - number of I/Os currently in flight - 4782 * in most cases this will be either 0 or 1. It may be higher if someone 4783 * has also issued other SCSI commands such as via an ioctl. 4784 * @dev: struct device 4785 * @attr: attribute structure 4786 * @buf: buffer to return formatted data in 4787 */ 4788 static ssize_t in_flight_show(struct device *dev, 4789 struct device_attribute *attr, char *buf) 4790 { 4791 struct st_modedef *STm = dev_get_drvdata(dev); 4792 4793 return sprintf(buf, "%lld", 4794 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4795 } 4796 static DEVICE_ATTR_RO(in_flight); 4797 4798 /** 4799 * io_ns_show - io wait ns - this is the number of ns spent 4800 * waiting on all I/O to complete. This includes tape movement commands 4801 * such as rewinding, seeking to end of file or tape, it also includes 4802 * read and write. To determine the time spent on tape movement 4803 * subtract the read and write ns from this value. 4804 * @dev: struct device 4805 * @attr: attribute structure 4806 * @buf: buffer to return formatted data in 4807 */ 4808 static ssize_t io_ns_show(struct device *dev, 4809 struct device_attribute *attr, char *buf) 4810 { 4811 struct st_modedef *STm = dev_get_drvdata(dev); 4812 4813 return sprintf(buf, "%lld", 4814 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4815 } 4816 static DEVICE_ATTR_RO(io_ns); 4817 4818 /** 4819 * other_cnt_show - other io count - this is the number of 4820 * I/O requests other than read and write requests. 4821 * Typically these are tape movement requests but will include driver 4822 * tape movement. This includes only requests issued by the st driver. 4823 * @dev: struct device 4824 * @attr: attribute structure 4825 * @buf: buffer to return formatted data in 4826 */ 4827 static ssize_t other_cnt_show(struct device *dev, 4828 struct device_attribute *attr, char *buf) 4829 { 4830 struct st_modedef *STm = dev_get_drvdata(dev); 4831 4832 return sprintf(buf, "%lld", 4833 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4834 } 4835 static DEVICE_ATTR_RO(other_cnt); 4836 4837 /** 4838 * resid_cnt_show - A count of the number of times we get a residual 4839 * count - this should indicate someone issuing reads larger than the 4840 * block size on tape. 4841 * @dev: struct device 4842 * @attr: attribute structure 4843 * @buf: buffer to return formatted data in 4844 */ 4845 static ssize_t resid_cnt_show(struct device *dev, 4846 struct device_attribute *attr, char *buf) 4847 { 4848 struct st_modedef *STm = dev_get_drvdata(dev); 4849 4850 return sprintf(buf, "%lld", 4851 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4852 } 4853 static DEVICE_ATTR_RO(resid_cnt); 4854 4855 static struct attribute *st_dev_attrs[] = { 4856 &dev_attr_defined.attr, 4857 &dev_attr_default_blksize.attr, 4858 &dev_attr_default_density.attr, 4859 &dev_attr_default_compression.attr, 4860 &dev_attr_options.attr, 4861 NULL, 4862 }; 4863 4864 static struct attribute *st_stats_attrs[] = { 4865 &dev_attr_read_cnt.attr, 4866 &dev_attr_read_byte_cnt.attr, 4867 &dev_attr_read_ns.attr, 4868 &dev_attr_write_cnt.attr, 4869 &dev_attr_write_byte_cnt.attr, 4870 &dev_attr_write_ns.attr, 4871 &dev_attr_in_flight.attr, 4872 &dev_attr_io_ns.attr, 4873 &dev_attr_other_cnt.attr, 4874 &dev_attr_resid_cnt.attr, 4875 NULL, 4876 }; 4877 4878 static struct attribute_group stats_group = { 4879 .name = "stats", 4880 .attrs = st_stats_attrs, 4881 }; 4882 4883 static struct attribute_group st_group = { 4884 .attrs = st_dev_attrs, 4885 }; 4886 4887 static const struct attribute_group *st_dev_groups[] = { 4888 &st_group, 4889 &stats_group, 4890 NULL, 4891 }; 4892 4893 /* The following functions may be useful for a larger audience. */ 4894 static int sgl_map_user_pages(struct st_buffer *STbp, 4895 const unsigned int max_pages, unsigned long uaddr, 4896 size_t count, int rw) 4897 { 4898 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4899 unsigned long start = uaddr >> PAGE_SHIFT; 4900 const int nr_pages = end - start; 4901 int res, i, j; 4902 struct page **pages; 4903 struct rq_map_data *mdata = &STbp->map_data; 4904 4905 /* User attempted Overflow! */ 4906 if ((uaddr + count) < uaddr) 4907 return -EINVAL; 4908 4909 /* Too big */ 4910 if (nr_pages > max_pages) 4911 return -ENOMEM; 4912 4913 /* Hmm? */ 4914 if (count == 0) 4915 return 0; 4916 4917 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) 4918 return -ENOMEM; 4919 4920 /* Try to fault in all of the necessary pages */ 4921 /* rw==READ means read from drive, write into memory area */ 4922 res = get_user_pages_unlocked( 4923 uaddr, 4924 nr_pages, 4925 rw == READ, 4926 0, /* don't force */ 4927 pages); 4928 4929 /* Errors and no page mapped should return here */ 4930 if (res < nr_pages) 4931 goto out_unmap; 4932 4933 for (i=0; i < nr_pages; i++) { 4934 /* FIXME: flush superflous for rw==READ, 4935 * probably wrong function for rw==WRITE 4936 */ 4937 flush_dcache_page(pages[i]); 4938 } 4939 4940 mdata->offset = uaddr & ~PAGE_MASK; 4941 STbp->mapped_pages = pages; 4942 4943 return nr_pages; 4944 out_unmap: 4945 if (res > 0) { 4946 for (j=0; j < res; j++) 4947 put_page(pages[j]); 4948 res = 0; 4949 } 4950 kfree(pages); 4951 return res; 4952 } 4953 4954 4955 /* And unmap them... */ 4956 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4957 const unsigned int nr_pages, int dirtied) 4958 { 4959 int i; 4960 4961 for (i=0; i < nr_pages; i++) { 4962 struct page *page = STbp->mapped_pages[i]; 4963 4964 if (dirtied) 4965 SetPageDirty(page); 4966 /* FIXME: cache flush missing for rw==READ 4967 * FIXME: call the correct reference counting function 4968 */ 4969 put_page(page); 4970 } 4971 kfree(STbp->mapped_pages); 4972 STbp->mapped_pages = NULL; 4973 4974 return 0; 4975 } 4976