ide-tape.c revision 2ac07d920604eeee8966d52e70161f9b31fe90a3
1/* 2 * IDE ATAPI streaming tape driver. 3 * 4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> 5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz 6 * 7 * This driver was constructed as a student project in the software laboratory 8 * of the faculty of electrical engineering in the Technion - Israel's 9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. 10 * 11 * It is hereby placed under the terms of the GNU general public license. 12 * (See linux/COPYING). 13 * 14 * For a historical changelog see 15 * Documentation/ide/ChangeLog.ide-tape.1995-2002 16 */ 17 18#define DRV_NAME "ide-tape" 19 20#define IDETAPE_VERSION "1.20" 21 22#include <linux/module.h> 23#include <linux/types.h> 24#include <linux/string.h> 25#include <linux/kernel.h> 26#include <linux/delay.h> 27#include <linux/timer.h> 28#include <linux/mm.h> 29#include <linux/interrupt.h> 30#include <linux/jiffies.h> 31#include <linux/major.h> 32#include <linux/errno.h> 33#include <linux/genhd.h> 34#include <linux/slab.h> 35#include <linux/pci.h> 36#include <linux/ide.h> 37#include <linux/smp_lock.h> 38#include <linux/completion.h> 39#include <linux/bitops.h> 40#include <linux/mutex.h> 41#include <scsi/scsi.h> 42 43#include <asm/byteorder.h> 44#include <linux/irq.h> 45#include <linux/uaccess.h> 46#include <linux/io.h> 47#include <asm/unaligned.h> 48#include <linux/mtio.h> 49 50enum { 51 /* output errors only */ 52 DBG_ERR = (1 << 0), 53 /* output all sense key/asc */ 54 DBG_SENSE = (1 << 1), 55 /* info regarding all chrdev-related procedures */ 56 DBG_CHRDEV = (1 << 2), 57 /* all remaining procedures */ 58 DBG_PROCS = (1 << 3), 59}; 60 61/* define to see debug info */ 62#define IDETAPE_DEBUG_LOG 0 63 64#if IDETAPE_DEBUG_LOG 65#define debug_log(lvl, fmt, args...) \ 66{ \ 67 if (tape->debug_mask & lvl) \ 68 printk(KERN_INFO "ide-tape: " fmt, ## args); \ 69} 70#else 71#define debug_log(lvl, fmt, args...) do {} while (0) 72#endif 73 74/**************************** Tunable parameters *****************************/ 75/* 76 * After each failed packet command we issue a request sense command and retry 77 * the packet command IDETAPE_MAX_PC_RETRIES times. 78 * 79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 80 */ 81#define IDETAPE_MAX_PC_RETRIES 3 82 83/* 84 * Some drives (for example, Seagate STT3401A Travan) require a very long 85 * timeout, because they don't return an interrupt or clear their busy bit 86 * until after the command completes (even retension commands). 87 */ 88#define IDETAPE_WAIT_CMD (900*HZ) 89 90/* 91 * The following parameter is used to select the point in the internal tape fifo 92 * in which we will start to refill the buffer. Decreasing the following 93 * parameter will improve the system's latency and interactive response, while 94 * using a high value might improve system throughput. 95 */ 96#define IDETAPE_FIFO_THRESHOLD 2 97 98/* 99 * DSC polling parameters. 100 * 101 * Polling for DSC (a single bit in the status register) is a very important 102 * function in ide-tape. There are two cases in which we poll for DSC: 103 * 104 * 1. Before a read/write packet command, to ensure that we can transfer data 105 * from/to the tape's data buffers, without causing an actual media access. 106 * In case the tape is not ready yet, we take out our request from the device 107 * request queue, so that ide.c could service requests from the other device 108 * on the same interface in the meantime. 109 * 110 * 2. After the successful initialization of a "media access packet command", 111 * which is a command that can take a long time to complete (the interval can 112 * range from several seconds to even an hour). Again, we postpone our request 113 * in the middle to free the bus for the other device. The polling frequency 114 * here should be lower than the read/write frequency since those media access 115 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 116 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 117 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 118 * 119 * We also set a timeout for the timer, in case something goes wrong. The 120 * timeout should be longer then the maximum execution time of a tape operation. 121 */ 122 123/* DSC timings. */ 124#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 125#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 126#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 127#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 128#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 129#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 130#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 131 132/*************************** End of tunable parameters ***********************/ 133 134/* tape directions */ 135enum { 136 IDETAPE_DIR_NONE = (1 << 0), 137 IDETAPE_DIR_READ = (1 << 1), 138 IDETAPE_DIR_WRITE = (1 << 2), 139}; 140 141struct idetape_bh { 142 u32 b_size; 143 atomic_t b_count; 144 struct idetape_bh *b_reqnext; 145 char *b_data; 146}; 147 148/* Tape door status */ 149#define DOOR_UNLOCKED 0 150#define DOOR_LOCKED 1 151#define DOOR_EXPLICITLY_LOCKED 2 152 153/* Some defines for the SPACE command */ 154#define IDETAPE_SPACE_OVER_FILEMARK 1 155#define IDETAPE_SPACE_TO_EOD 3 156 157/* Some defines for the LOAD UNLOAD command */ 158#define IDETAPE_LU_LOAD_MASK 1 159#define IDETAPE_LU_RETENSION_MASK 2 160#define IDETAPE_LU_EOT_MASK 4 161 162/* Error codes returned in rq->errors to the higher part of the driver. */ 163#define IDETAPE_ERROR_GENERAL 101 164#define IDETAPE_ERROR_FILEMARK 102 165#define IDETAPE_ERROR_EOD 103 166 167/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 168#define IDETAPE_BLOCK_DESCRIPTOR 0 169#define IDETAPE_CAPABILITIES_PAGE 0x2a 170 171/* 172 * Most of our global data which we need to save even as we leave the driver due 173 * to an interrupt or a timer event is stored in the struct defined below. 174 */ 175typedef struct ide_tape_obj { 176 ide_drive_t *drive; 177 ide_driver_t *driver; 178 struct gendisk *disk; 179 struct kref kref; 180 181 /* 182 * pc points to the current processed packet command. 183 * 184 * failed_pc points to the last failed packet command, or contains 185 * NULL if we do not need to retry any packet command. This is 186 * required since an additional packet command is needed before the 187 * retry, to get detailed information on what went wrong. 188 */ 189 /* Current packet command */ 190 struct ide_atapi_pc *pc; 191 /* Last failed packet command */ 192 struct ide_atapi_pc *failed_pc; 193 /* used by REQ_IDETAPE_{READ,WRITE} requests */ 194 struct ide_atapi_pc queued_pc; 195 196 struct ide_atapi_pc request_sense_pc; 197 struct request request_sense_rq; 198 199 /* 200 * DSC polling variables. 201 * 202 * While polling for DSC we use postponed_rq to postpone the current 203 * request so that ide.c will be able to service pending requests on the 204 * other device. Note that at most we will have only one DSC (usually 205 * data transfer) request in the device request queue. 206 */ 207 struct request *postponed_rq; 208 /* The time in which we started polling for DSC */ 209 unsigned long dsc_polling_start; 210 /* Timer used to poll for dsc */ 211 struct timer_list dsc_timer; 212 /* Read/Write dsc polling frequency */ 213 unsigned long best_dsc_rw_freq; 214 unsigned long dsc_poll_freq; 215 unsigned long dsc_timeout; 216 217 /* Read position information */ 218 u8 partition; 219 /* Current block */ 220 unsigned int first_frame; 221 222 /* Last error information */ 223 u8 sense_key, asc, ascq; 224 225 /* Character device operation */ 226 unsigned int minor; 227 /* device name */ 228 char name[4]; 229 /* Current character device data transfer direction */ 230 u8 chrdev_dir; 231 232 /* tape block size, usually 512 or 1024 bytes */ 233 unsigned short blk_size; 234 int user_bs_factor; 235 236 /* Copy of the tape's Capabilities and Mechanical Page */ 237 u8 caps[20]; 238 239 /* 240 * Active data transfer request parameters. 241 * 242 * At most, there is only one ide-tape originated data transfer request 243 * in the device request queue. This allows ide.c to easily service 244 * requests from the other device when we postpone our active request. 245 */ 246 247 /* Data buffer size chosen based on the tape's recommendation */ 248 int buffer_size; 249 /* merge buffer */ 250 struct idetape_bh *merge_bh; 251 /* size of the merge buffer */ 252 int merge_bh_size; 253 /* pointer to current buffer head within the merge buffer */ 254 struct idetape_bh *bh; 255 char *b_data; 256 int b_count; 257 258 int pages_per_buffer; 259 /* Wasted space in each stage */ 260 int excess_bh_size; 261 262 /* protects the ide-tape queue */ 263 spinlock_t lock; 264 265 /* Measures average tape speed */ 266 unsigned long avg_time; 267 int avg_size; 268 int avg_speed; 269 270 /* the door is currently locked */ 271 int door_locked; 272 /* the tape hardware is write protected */ 273 char drv_write_prot; 274 /* the tape is write protected (hardware or opened as read-only) */ 275 char write_prot; 276 277 u32 debug_mask; 278} idetape_tape_t; 279 280static DEFINE_MUTEX(idetape_ref_mutex); 281 282static struct class *idetape_sysfs_class; 283 284#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) 285 286#define ide_tape_g(disk) \ 287 container_of((disk)->private_data, struct ide_tape_obj, driver) 288 289static void ide_tape_release(struct kref *); 290 291static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 292{ 293 struct ide_tape_obj *tape = NULL; 294 295 mutex_lock(&idetape_ref_mutex); 296 tape = ide_tape_g(disk); 297 if (tape) { 298 if (ide_device_get(tape->drive)) 299 tape = NULL; 300 else 301 kref_get(&tape->kref); 302 } 303 mutex_unlock(&idetape_ref_mutex); 304 return tape; 305} 306 307static void ide_tape_put(struct ide_tape_obj *tape) 308{ 309 ide_drive_t *drive = tape->drive; 310 311 mutex_lock(&idetape_ref_mutex); 312 kref_put(&tape->kref, ide_tape_release); 313 ide_device_put(drive); 314 mutex_unlock(&idetape_ref_mutex); 315} 316 317/* 318 * The variables below are used for the character device interface. Additional 319 * state variables are defined in our ide_drive_t structure. 320 */ 321static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 322 323#define ide_tape_f(file) ((file)->private_data) 324 325static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 326{ 327 struct ide_tape_obj *tape = NULL; 328 329 mutex_lock(&idetape_ref_mutex); 330 tape = idetape_devs[i]; 331 if (tape) 332 kref_get(&tape->kref); 333 mutex_unlock(&idetape_ref_mutex); 334 return tape; 335} 336 337static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, 338 unsigned int bcount) 339{ 340 struct idetape_bh *bh = pc->bh; 341 int count; 342 343 while (bcount) { 344 if (bh == NULL) { 345 printk(KERN_ERR "ide-tape: bh == NULL in " 346 "idetape_input_buffers\n"); 347 ide_pad_transfer(drive, 0, bcount); 348 return; 349 } 350 count = min( 351 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), 352 bcount); 353 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + 354 atomic_read(&bh->b_count), count); 355 bcount -= count; 356 atomic_add(count, &bh->b_count); 357 if (atomic_read(&bh->b_count) == bh->b_size) { 358 bh = bh->b_reqnext; 359 if (bh) 360 atomic_set(&bh->b_count, 0); 361 } 362 } 363 pc->bh = bh; 364} 365 366static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, 367 unsigned int bcount) 368{ 369 struct idetape_bh *bh = pc->bh; 370 int count; 371 372 while (bcount) { 373 if (bh == NULL) { 374 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 375 __func__); 376 return; 377 } 378 count = min((unsigned int)pc->b_count, (unsigned int)bcount); 379 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); 380 bcount -= count; 381 pc->b_data += count; 382 pc->b_count -= count; 383 if (!pc->b_count) { 384 bh = bh->b_reqnext; 385 pc->bh = bh; 386 if (bh) { 387 pc->b_data = bh->b_data; 388 pc->b_count = atomic_read(&bh->b_count); 389 } 390 } 391 } 392} 393 394static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) 395{ 396 struct idetape_bh *bh = pc->bh; 397 int count; 398 unsigned int bcount = pc->xferred; 399 400 if (pc->flags & PC_FLAG_WRITING) 401 return; 402 while (bcount) { 403 if (bh == NULL) { 404 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 405 __func__); 406 return; 407 } 408 count = min((unsigned int)bh->b_size, (unsigned int)bcount); 409 atomic_set(&bh->b_count, count); 410 if (atomic_read(&bh->b_count) == bh->b_size) 411 bh = bh->b_reqnext; 412 bcount -= count; 413 } 414 pc->bh = bh; 415} 416 417/* 418 * called on each failed packet command retry to analyze the request sense. We 419 * currently do not utilize this information. 420 */ 421static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) 422{ 423 idetape_tape_t *tape = drive->driver_data; 424 struct ide_atapi_pc *pc = tape->failed_pc; 425 426 tape->sense_key = sense[2] & 0xF; 427 tape->asc = sense[12]; 428 tape->ascq = sense[13]; 429 430 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", 431 pc->c[0], tape->sense_key, tape->asc, tape->ascq); 432 433 /* Correct pc->xferred by asking the tape. */ 434 if (pc->flags & PC_FLAG_DMA_ERROR) { 435 pc->xferred = pc->req_xfer - 436 tape->blk_size * 437 get_unaligned_be32(&sense[3]); 438 idetape_update_buffers(drive, pc); 439 } 440 441 /* 442 * If error was the result of a zero-length read or write command, 443 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 444 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 445 */ 446 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 447 /* length == 0 */ 448 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 449 if (tape->sense_key == 5) { 450 /* don't report an error, everything's ok */ 451 pc->error = 0; 452 /* don't retry read/write */ 453 pc->flags |= PC_FLAG_ABORT; 454 } 455 } 456 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 457 pc->error = IDETAPE_ERROR_FILEMARK; 458 pc->flags |= PC_FLAG_ABORT; 459 } 460 if (pc->c[0] == WRITE_6) { 461 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 462 && tape->asc == 0x0 && tape->ascq == 0x2)) { 463 pc->error = IDETAPE_ERROR_EOD; 464 pc->flags |= PC_FLAG_ABORT; 465 } 466 } 467 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 468 if (tape->sense_key == 8) { 469 pc->error = IDETAPE_ERROR_EOD; 470 pc->flags |= PC_FLAG_ABORT; 471 } 472 if (!(pc->flags & PC_FLAG_ABORT) && 473 pc->xferred) 474 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 475 } 476} 477 478/* Free data buffers completely. */ 479static void ide_tape_kfree_buffer(idetape_tape_t *tape) 480{ 481 struct idetape_bh *prev_bh, *bh = tape->merge_bh; 482 483 while (bh) { 484 u32 size = bh->b_size; 485 486 while (size) { 487 unsigned int order = fls(size >> PAGE_SHIFT)-1; 488 489 if (bh->b_data) 490 free_pages((unsigned long)bh->b_data, order); 491 492 size &= (order-1); 493 bh->b_data += (1 << order) * PAGE_SIZE; 494 } 495 prev_bh = bh; 496 bh = bh->b_reqnext; 497 kfree(prev_bh); 498 } 499} 500 501static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) 502{ 503 struct request *rq = HWGROUP(drive)->rq; 504 idetape_tape_t *tape = drive->driver_data; 505 unsigned long flags; 506 int error; 507 508 debug_log(DBG_PROCS, "Enter %s\n", __func__); 509 510 switch (uptodate) { 511 case 0: error = IDETAPE_ERROR_GENERAL; break; 512 case 1: error = 0; break; 513 default: error = uptodate; 514 } 515 rq->errors = error; 516 if (error) 517 tape->failed_pc = NULL; 518 519 if (!blk_special_request(rq)) { 520 ide_end_request(drive, uptodate, nr_sects); 521 return 0; 522 } 523 524 spin_lock_irqsave(&tape->lock, flags); 525 526 ide_end_drive_cmd(drive, 0, 0); 527 528 spin_unlock_irqrestore(&tape->lock, flags); 529 return 0; 530} 531 532static void ide_tape_callback(ide_drive_t *drive) 533{ 534 idetape_tape_t *tape = drive->driver_data; 535 struct ide_atapi_pc *pc = tape->pc; 536 int uptodate = pc->error ? 0 : 1; 537 538 debug_log(DBG_PROCS, "Enter %s\n", __func__); 539 540 if (tape->failed_pc == pc) 541 tape->failed_pc = NULL; 542 543 if (pc->c[0] == REQUEST_SENSE) { 544 if (uptodate) 545 idetape_analyze_error(drive, pc->buf); 546 else 547 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 548 "itself - Aborting request!\n"); 549 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 550 struct request *rq = drive->hwif->hwgroup->rq; 551 int blocks = pc->xferred / tape->blk_size; 552 553 tape->avg_size += blocks * tape->blk_size; 554 555 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 556 tape->avg_speed = tape->avg_size * HZ / 557 (jiffies - tape->avg_time) / 1024; 558 tape->avg_size = 0; 559 tape->avg_time = jiffies; 560 } 561 562 tape->first_frame += blocks; 563 rq->current_nr_sectors -= blocks; 564 565 if (pc->error) 566 uptodate = pc->error; 567 } else if (pc->c[0] == READ_POSITION && uptodate) { 568 u8 *readpos = tape->pc->buf; 569 570 debug_log(DBG_SENSE, "BOP - %s\n", 571 (readpos[0] & 0x80) ? "Yes" : "No"); 572 debug_log(DBG_SENSE, "EOP - %s\n", 573 (readpos[0] & 0x40) ? "Yes" : "No"); 574 575 if (readpos[0] & 0x4) { 576 printk(KERN_INFO "ide-tape: Block location is unknown" 577 "to the tape\n"); 578 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 579 uptodate = 0; 580 } else { 581 debug_log(DBG_SENSE, "Block Location - %u\n", 582 be32_to_cpup((__be32 *)&readpos[4])); 583 584 tape->partition = readpos[1]; 585 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); 586 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 587 } 588 } 589 590 idetape_end_request(drive, uptodate, 0); 591} 592 593static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) 594{ 595 ide_init_pc(pc); 596 pc->c[0] = REQUEST_SENSE; 597 pc->c[4] = 20; 598 pc->req_xfer = 20; 599} 600 601/* 602 * idetape_retry_pc is called when an error was detected during the 603 * last packet command. We queue a request sense packet command in 604 * the head of the request list. 605 */ 606static void idetape_retry_pc(ide_drive_t *drive) 607{ 608 struct ide_tape_obj *tape = drive->driver_data; 609 struct request *rq = &tape->request_sense_rq; 610 struct ide_atapi_pc *pc = &tape->request_sense_pc; 611 612 (void)ide_read_error(drive); 613 idetape_create_request_sense_cmd(pc); 614 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 615 ide_queue_pc_head(drive, tape->disk, pc, rq); 616} 617 618/* 619 * Postpone the current request so that ide.c will be able to service requests 620 * from another device on the same hwgroup while we are polling for DSC. 621 */ 622static void idetape_postpone_request(ide_drive_t *drive) 623{ 624 idetape_tape_t *tape = drive->driver_data; 625 626 debug_log(DBG_PROCS, "Enter %s\n", __func__); 627 628 tape->postponed_rq = HWGROUP(drive)->rq; 629 ide_stall_queue(drive, tape->dsc_poll_freq); 630} 631 632static void ide_tape_handle_dsc(ide_drive_t *drive) 633{ 634 idetape_tape_t *tape = drive->driver_data; 635 636 /* Media access command */ 637 tape->dsc_polling_start = jiffies; 638 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 639 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 640 /* Allow ide.c to handle other requests */ 641 idetape_postpone_request(drive); 642} 643 644static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, 645 unsigned int bcount, int write) 646{ 647 if (write) 648 idetape_output_buffers(drive, pc, bcount); 649 else 650 idetape_input_buffers(drive, pc, bcount); 651 652 return bcount; 653} 654 655/* 656 * This is the usual interrupt handler which will be called during a packet 657 * command. We will transfer some of the data (as requested by the drive) and 658 * will re-point interrupt handler to us. When data transfer is finished, we 659 * will act according to the algorithm described before 660 * idetape_issue_pc. 661 */ 662static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) 663{ 664 idetape_tape_t *tape = drive->driver_data; 665 666 return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD, 667 NULL, idetape_update_buffers, idetape_retry_pc, 668 ide_tape_handle_dsc, ide_tape_io_buffers); 669} 670 671/* 672 * Packet Command Interface 673 * 674 * The current Packet Command is available in tape->pc, and will not change 675 * until we finish handling it. Each packet command is associated with a 676 * callback function that will be called when the command is finished. 677 * 678 * The handling will be done in three stages: 679 * 680 * 1. idetape_issue_pc will send the packet command to the drive, and will set 681 * the interrupt handler to idetape_pc_intr. 682 * 683 * 2. On each interrupt, idetape_pc_intr will be called. This step will be 684 * repeated until the device signals us that no more interrupts will be issued. 685 * 686 * 3. ATAPI Tape media access commands have immediate status with a delayed 687 * process. In case of a successful initiation of a media access packet command, 688 * the DSC bit will be set when the actual execution of the command is finished. 689 * Since the tape drive will not issue an interrupt, we have to poll for this 690 * event. In this case, we define the request as "low priority request" by 691 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 692 * exit the driver. 693 * 694 * ide.c will then give higher priority to requests which originate from the 695 * other device, until will change rq_status to RQ_ACTIVE. 696 * 697 * 4. When the packet command is finished, it will be checked for errors. 698 * 699 * 5. In case an error was found, we queue a request sense packet command in 700 * front of the request queue and retry the operation up to 701 * IDETAPE_MAX_PC_RETRIES times. 702 * 703 * 6. In case no error was found, or we decided to give up and not to retry 704 * again, the callback function will be called and then we will handle the next 705 * request. 706 */ 707static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 708{ 709 idetape_tape_t *tape = drive->driver_data; 710 711 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, 712 IDETAPE_WAIT_CMD, NULL); 713} 714 715static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, 716 struct ide_atapi_pc *pc) 717{ 718 idetape_tape_t *tape = drive->driver_data; 719 720 if (tape->pc->c[0] == REQUEST_SENSE && 721 pc->c[0] == REQUEST_SENSE) { 722 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " 723 "Two request sense in serial were issued\n"); 724 } 725 726 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 727 tape->failed_pc = pc; 728 /* Set the current packet command */ 729 tape->pc = pc; 730 731 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 732 (pc->flags & PC_FLAG_ABORT)) { 733 /* 734 * We will "abort" retrying a packet command in case legitimate 735 * error code was received (crossing a filemark, or end of the 736 * media, for example). 737 */ 738 if (!(pc->flags & PC_FLAG_ABORT)) { 739 if (!(pc->c[0] == TEST_UNIT_READY && 740 tape->sense_key == 2 && tape->asc == 4 && 741 (tape->ascq == 1 || tape->ascq == 8))) { 742 printk(KERN_ERR "ide-tape: %s: I/O error, " 743 "pc = %2x, key = %2x, " 744 "asc = %2x, ascq = %2x\n", 745 tape->name, pc->c[0], 746 tape->sense_key, tape->asc, 747 tape->ascq); 748 } 749 /* Giving up */ 750 pc->error = IDETAPE_ERROR_GENERAL; 751 } 752 tape->failed_pc = NULL; 753 drive->pc_callback(drive); 754 return ide_stopped; 755 } 756 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); 757 758 pc->retries++; 759 760 return ide_issue_pc(drive, pc, idetape_transfer_pc, 761 IDETAPE_WAIT_CMD, NULL); 762} 763 764/* A mode sense command is used to "sense" tape parameters. */ 765static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 766{ 767 ide_init_pc(pc); 768 pc->c[0] = MODE_SENSE; 769 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 770 /* DBD = 1 - Don't return block descriptors */ 771 pc->c[1] = 8; 772 pc->c[2] = page_code; 773 /* 774 * Changed pc->c[3] to 0 (255 will at best return unused info). 775 * 776 * For SCSI this byte is defined as subpage instead of high byte 777 * of length and some IDE drives seem to interpret it this way 778 * and return an error when 255 is used. 779 */ 780 pc->c[3] = 0; 781 /* We will just discard data in that case */ 782 pc->c[4] = 255; 783 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 784 pc->req_xfer = 12; 785 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 786 pc->req_xfer = 24; 787 else 788 pc->req_xfer = 50; 789} 790 791static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 792{ 793 ide_hwif_t *hwif = drive->hwif; 794 idetape_tape_t *tape = drive->driver_data; 795 struct ide_atapi_pc *pc = tape->pc; 796 u8 stat; 797 798 stat = hwif->tp_ops->read_status(hwif); 799 800 if (stat & ATA_DSC) { 801 if (stat & ATA_ERR) { 802 /* Error detected */ 803 if (pc->c[0] != TEST_UNIT_READY) 804 printk(KERN_ERR "ide-tape: %s: I/O error, ", 805 tape->name); 806 /* Retry operation */ 807 idetape_retry_pc(drive); 808 return ide_stopped; 809 } 810 pc->error = 0; 811 } else { 812 pc->error = IDETAPE_ERROR_GENERAL; 813 tape->failed_pc = NULL; 814 } 815 drive->pc_callback(drive); 816 return ide_stopped; 817} 818 819static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 820 struct ide_atapi_pc *pc, struct request *rq, 821 u8 opcode) 822{ 823 struct idetape_bh *bh = (struct idetape_bh *)rq->special; 824 unsigned int length = rq->current_nr_sectors; 825 826 ide_init_pc(pc); 827 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 828 pc->c[1] = 1; 829 pc->bh = bh; 830 pc->buf = NULL; 831 pc->buf_size = length * tape->blk_size; 832 pc->req_xfer = pc->buf_size; 833 if (pc->req_xfer == tape->buffer_size) 834 pc->flags |= PC_FLAG_DMA_OK; 835 836 if (opcode == READ_6) { 837 pc->c[0] = READ_6; 838 atomic_set(&bh->b_count, 0); 839 } else if (opcode == WRITE_6) { 840 pc->c[0] = WRITE_6; 841 pc->flags |= PC_FLAG_WRITING; 842 pc->b_data = bh->b_data; 843 pc->b_count = atomic_read(&bh->b_count); 844 } 845 846 memcpy(rq->cmd, pc->c, 12); 847} 848 849static ide_startstop_t idetape_do_request(ide_drive_t *drive, 850 struct request *rq, sector_t block) 851{ 852 ide_hwif_t *hwif = drive->hwif; 853 idetape_tape_t *tape = drive->driver_data; 854 struct ide_atapi_pc *pc = NULL; 855 struct request *postponed_rq = tape->postponed_rq; 856 u8 stat; 857 858 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," 859 " current_nr_sectors: %u\n", 860 (unsigned long long)rq->sector, rq->nr_sectors, 861 rq->current_nr_sectors); 862 863 if (!blk_special_request(rq)) { 864 /* We do not support buffer cache originated requests. */ 865 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 866 "request queue (%d)\n", drive->name, rq->cmd_type); 867 ide_end_request(drive, 0, 0); 868 return ide_stopped; 869 } 870 871 /* Retry a failed packet command */ 872 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { 873 pc = tape->failed_pc; 874 goto out; 875 } 876 877 if (postponed_rq != NULL) 878 if (rq != postponed_rq) { 879 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 880 "Two DSC requests were queued\n"); 881 idetape_end_request(drive, 0, 0); 882 return ide_stopped; 883 } 884 885 tape->postponed_rq = NULL; 886 887 /* 888 * If the tape is still busy, postpone our request and service 889 * the other device meanwhile. 890 */ 891 stat = hwif->tp_ops->read_status(hwif); 892 893 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) 894 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 895 896 if (drive->post_reset == 1) { 897 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 898 drive->post_reset = 0; 899 } 900 901 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && 902 (stat & ATA_DSC) == 0) { 903 if (postponed_rq == NULL) { 904 tape->dsc_polling_start = jiffies; 905 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 906 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 907 } else if (time_after(jiffies, tape->dsc_timeout)) { 908 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 909 tape->name); 910 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 911 idetape_media_access_finished(drive); 912 return ide_stopped; 913 } else { 914 return ide_do_reset(drive); 915 } 916 } else if (time_after(jiffies, 917 tape->dsc_polling_start + 918 IDETAPE_DSC_MA_THRESHOLD)) 919 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 920 idetape_postpone_request(drive); 921 return ide_stopped; 922 } 923 if (rq->cmd[13] & REQ_IDETAPE_READ) { 924 pc = &tape->queued_pc; 925 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 926 goto out; 927 } 928 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 929 pc = &tape->queued_pc; 930 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 931 goto out; 932 } 933 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 934 pc = (struct ide_atapi_pc *) rq->buffer; 935 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 936 rq->cmd[13] |= REQ_IDETAPE_PC2; 937 goto out; 938 } 939 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 940 idetape_media_access_finished(drive); 941 return ide_stopped; 942 } 943 BUG(); 944 945out: 946 return idetape_issue_pc(drive, pc); 947} 948 949/* 950 * The function below uses __get_free_pages to allocate a data buffer of size 951 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as 952 * much as possible. 953 * 954 * It returns a pointer to the newly allocated buffer, or NULL in case of 955 * failure. 956 */ 957static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, 958 int full, int clear) 959{ 960 struct idetape_bh *prev_bh, *bh, *merge_bh; 961 int pages = tape->pages_per_buffer; 962 unsigned int order, b_allocd; 963 char *b_data = NULL; 964 965 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 966 bh = merge_bh; 967 if (bh == NULL) 968 goto abort; 969 970 order = fls(pages) - 1; 971 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); 972 if (!bh->b_data) 973 goto abort; 974 b_allocd = (1 << order) * PAGE_SIZE; 975 pages &= (order-1); 976 977 if (clear) 978 memset(bh->b_data, 0, b_allocd); 979 bh->b_reqnext = NULL; 980 bh->b_size = b_allocd; 981 atomic_set(&bh->b_count, full ? bh->b_size : 0); 982 983 while (pages) { 984 order = fls(pages) - 1; 985 b_data = (char *) __get_free_pages(GFP_KERNEL, order); 986 if (!b_data) 987 goto abort; 988 b_allocd = (1 << order) * PAGE_SIZE; 989 990 if (clear) 991 memset(b_data, 0, b_allocd); 992 993 /* newly allocated page frames below buffer header or ...*/ 994 if (bh->b_data == b_data + b_allocd) { 995 bh->b_size += b_allocd; 996 bh->b_data -= b_allocd; 997 if (full) 998 atomic_add(b_allocd, &bh->b_count); 999 continue; 1000 } 1001 /* they are above the header */ 1002 if (b_data == bh->b_data + bh->b_size) { 1003 bh->b_size += b_allocd; 1004 if (full) 1005 atomic_add(b_allocd, &bh->b_count); 1006 continue; 1007 } 1008 prev_bh = bh; 1009 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 1010 if (!bh) { 1011 free_pages((unsigned long) b_data, order); 1012 goto abort; 1013 } 1014 bh->b_reqnext = NULL; 1015 bh->b_data = b_data; 1016 bh->b_size = b_allocd; 1017 atomic_set(&bh->b_count, full ? bh->b_size : 0); 1018 prev_bh->b_reqnext = bh; 1019 1020 pages &= (order-1); 1021 } 1022 1023 bh->b_size -= tape->excess_bh_size; 1024 if (full) 1025 atomic_sub(tape->excess_bh_size, &bh->b_count); 1026 return merge_bh; 1027abort: 1028 ide_tape_kfree_buffer(tape); 1029 return NULL; 1030} 1031 1032static int idetape_copy_stage_from_user(idetape_tape_t *tape, 1033 const char __user *buf, int n) 1034{ 1035 struct idetape_bh *bh = tape->bh; 1036 int count; 1037 int ret = 0; 1038 1039 while (n) { 1040 if (bh == NULL) { 1041 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 1042 __func__); 1043 return 1; 1044 } 1045 count = min((unsigned int) 1046 (bh->b_size - atomic_read(&bh->b_count)), 1047 (unsigned int)n); 1048 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, 1049 count)) 1050 ret = 1; 1051 n -= count; 1052 atomic_add(count, &bh->b_count); 1053 buf += count; 1054 if (atomic_read(&bh->b_count) == bh->b_size) { 1055 bh = bh->b_reqnext; 1056 if (bh) 1057 atomic_set(&bh->b_count, 0); 1058 } 1059 } 1060 tape->bh = bh; 1061 return ret; 1062} 1063 1064static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, 1065 int n) 1066{ 1067 struct idetape_bh *bh = tape->bh; 1068 int count; 1069 int ret = 0; 1070 1071 while (n) { 1072 if (bh == NULL) { 1073 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 1074 __func__); 1075 return 1; 1076 } 1077 count = min(tape->b_count, n); 1078 if (copy_to_user(buf, tape->b_data, count)) 1079 ret = 1; 1080 n -= count; 1081 tape->b_data += count; 1082 tape->b_count -= count; 1083 buf += count; 1084 if (!tape->b_count) { 1085 bh = bh->b_reqnext; 1086 tape->bh = bh; 1087 if (bh) { 1088 tape->b_data = bh->b_data; 1089 tape->b_count = atomic_read(&bh->b_count); 1090 } 1091 } 1092 } 1093 return ret; 1094} 1095 1096static void idetape_init_merge_buffer(idetape_tape_t *tape) 1097{ 1098 struct idetape_bh *bh = tape->merge_bh; 1099 tape->bh = tape->merge_bh; 1100 1101 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1102 atomic_set(&bh->b_count, 0); 1103 else { 1104 tape->b_data = bh->b_data; 1105 tape->b_count = atomic_read(&bh->b_count); 1106 } 1107} 1108 1109/* 1110 * Write a filemark if write_filemark=1. Flush the device buffers without 1111 * writing a filemark otherwise. 1112 */ 1113static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 1114 struct ide_atapi_pc *pc, int write_filemark) 1115{ 1116 ide_init_pc(pc); 1117 pc->c[0] = WRITE_FILEMARKS; 1118 pc->c[4] = write_filemark; 1119 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1120} 1121 1122static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) 1123{ 1124 ide_init_pc(pc); 1125 pc->c[0] = TEST_UNIT_READY; 1126} 1127 1128static void idetape_create_load_unload_cmd(ide_drive_t *drive, 1129 struct ide_atapi_pc *pc, int cmd) 1130{ 1131 ide_init_pc(pc); 1132 pc->c[0] = START_STOP; 1133 pc->c[4] = cmd; 1134 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1135} 1136 1137static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 1138{ 1139 idetape_tape_t *tape = drive->driver_data; 1140 struct gendisk *disk = tape->disk; 1141 struct ide_atapi_pc pc; 1142 int load_attempted = 0; 1143 1144 /* Wait for the tape to become ready */ 1145 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1146 timeout += jiffies; 1147 while (time_before(jiffies, timeout)) { 1148 idetape_create_test_unit_ready_cmd(&pc); 1149 if (!ide_queue_pc_tail(drive, disk, &pc)) 1150 return 0; 1151 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 1152 || (tape->asc == 0x3A)) { 1153 /* no media */ 1154 if (load_attempted) 1155 return -ENOMEDIUM; 1156 idetape_create_load_unload_cmd(drive, &pc, 1157 IDETAPE_LU_LOAD_MASK); 1158 ide_queue_pc_tail(drive, disk, &pc); 1159 load_attempted = 1; 1160 /* not about to be ready */ 1161 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 1162 (tape->ascq == 1 || tape->ascq == 8))) 1163 return -EIO; 1164 msleep(100); 1165 } 1166 return -EIO; 1167} 1168 1169static int idetape_flush_tape_buffers(ide_drive_t *drive) 1170{ 1171 struct ide_tape_obj *tape = drive->driver_data; 1172 struct ide_atapi_pc pc; 1173 int rc; 1174 1175 idetape_create_write_filemark_cmd(drive, &pc, 0); 1176 rc = ide_queue_pc_tail(drive, tape->disk, &pc); 1177 if (rc) 1178 return rc; 1179 idetape_wait_ready(drive, 60 * 5 * HZ); 1180 return 0; 1181} 1182 1183static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 1184{ 1185 ide_init_pc(pc); 1186 pc->c[0] = READ_POSITION; 1187 pc->req_xfer = 20; 1188} 1189 1190static int idetape_read_position(ide_drive_t *drive) 1191{ 1192 idetape_tape_t *tape = drive->driver_data; 1193 struct ide_atapi_pc pc; 1194 int position; 1195 1196 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1197 1198 idetape_create_read_position_cmd(&pc); 1199 if (ide_queue_pc_tail(drive, tape->disk, &pc)) 1200 return -1; 1201 position = tape->first_frame; 1202 return position; 1203} 1204 1205static void idetape_create_locate_cmd(ide_drive_t *drive, 1206 struct ide_atapi_pc *pc, 1207 unsigned int block, u8 partition, int skip) 1208{ 1209 ide_init_pc(pc); 1210 pc->c[0] = POSITION_TO_ELEMENT; 1211 pc->c[1] = 2; 1212 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 1213 pc->c[8] = partition; 1214 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1215} 1216 1217static int idetape_create_prevent_cmd(ide_drive_t *drive, 1218 struct ide_atapi_pc *pc, int prevent) 1219{ 1220 idetape_tape_t *tape = drive->driver_data; 1221 1222 /* device supports locking according to capabilities page */ 1223 if (!(tape->caps[6] & 0x01)) 1224 return 0; 1225 1226 ide_init_pc(pc); 1227 pc->c[0] = ALLOW_MEDIUM_REMOVAL; 1228 pc->c[4] = prevent; 1229 return 1; 1230} 1231 1232static int ide_tape_set_media_lock(ide_drive_t *drive, int on) 1233{ 1234 struct ide_tape_obj *tape = drive->driver_data; 1235 struct ide_atapi_pc pc; 1236 1237 if (!idetape_create_prevent_cmd(drive, &pc, on)) 1238 return 0; 1239 1240 return ide_queue_pc_tail(drive, tape->disk, &pc); 1241} 1242 1243static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 1244{ 1245 idetape_tape_t *tape = drive->driver_data; 1246 1247 if (tape->chrdev_dir != IDETAPE_DIR_READ) 1248 return; 1249 1250 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 1251 tape->merge_bh_size = 0; 1252 if (tape->merge_bh != NULL) { 1253 ide_tape_kfree_buffer(tape); 1254 tape->merge_bh = NULL; 1255 } 1256 1257 tape->chrdev_dir = IDETAPE_DIR_NONE; 1258} 1259 1260/* 1261 * Position the tape to the requested block using the LOCATE packet command. 1262 * A READ POSITION command is then issued to check where we are positioned. Like 1263 * all higher level operations, we queue the commands at the tail of the request 1264 * queue and wait for their completion. 1265 */ 1266static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 1267 u8 partition, int skip) 1268{ 1269 idetape_tape_t *tape = drive->driver_data; 1270 struct gendisk *disk = tape->disk; 1271 int retval; 1272 struct ide_atapi_pc pc; 1273 1274 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1275 __ide_tape_discard_merge_buffer(drive); 1276 idetape_wait_ready(drive, 60 * 5 * HZ); 1277 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 1278 retval = ide_queue_pc_tail(drive, disk, &pc); 1279 if (retval) 1280 return (retval); 1281 1282 idetape_create_read_position_cmd(&pc); 1283 return ide_queue_pc_tail(drive, disk, &pc); 1284} 1285 1286static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 1287 int restore_position) 1288{ 1289 idetape_tape_t *tape = drive->driver_data; 1290 int seek, position; 1291 1292 __ide_tape_discard_merge_buffer(drive); 1293 if (restore_position) { 1294 position = idetape_read_position(drive); 1295 seek = position > 0 ? position : 0; 1296 if (idetape_position_tape(drive, seek, 0, 0)) { 1297 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 1298 " %s\n", tape->name, __func__); 1299 return; 1300 } 1301 } 1302} 1303 1304/* 1305 * Generate a read/write request for the block device interface and wait for it 1306 * to be serviced. 1307 */ 1308static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, 1309 struct idetape_bh *bh) 1310{ 1311 idetape_tape_t *tape = drive->driver_data; 1312 struct request *rq; 1313 int ret, errors; 1314 1315 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 1316 1317 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 1318 rq->cmd_type = REQ_TYPE_SPECIAL; 1319 rq->cmd[13] = cmd; 1320 rq->rq_disk = tape->disk; 1321 rq->special = (void *)bh; 1322 rq->sector = tape->first_frame; 1323 rq->nr_sectors = blocks; 1324 rq->current_nr_sectors = blocks; 1325 blk_execute_rq(drive->queue, tape->disk, rq, 0); 1326 1327 errors = rq->errors; 1328 ret = tape->blk_size * (blocks - rq->current_nr_sectors); 1329 blk_put_request(rq); 1330 1331 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) 1332 return 0; 1333 1334 if (tape->merge_bh) 1335 idetape_init_merge_buffer(tape); 1336 if (errors == IDETAPE_ERROR_GENERAL) 1337 return -EIO; 1338 return ret; 1339} 1340 1341static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 1342{ 1343 ide_init_pc(pc); 1344 pc->c[0] = INQUIRY; 1345 pc->c[4] = 254; 1346 pc->req_xfer = 254; 1347} 1348 1349static void idetape_create_rewind_cmd(ide_drive_t *drive, 1350 struct ide_atapi_pc *pc) 1351{ 1352 ide_init_pc(pc); 1353 pc->c[0] = REZERO_UNIT; 1354 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1355} 1356 1357static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 1358{ 1359 ide_init_pc(pc); 1360 pc->c[0] = ERASE; 1361 pc->c[1] = 1; 1362 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1363} 1364 1365static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 1366{ 1367 ide_init_pc(pc); 1368 pc->c[0] = SPACE; 1369 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 1370 pc->c[1] = cmd; 1371 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1372} 1373 1374/* Queue up a character device originated write request. */ 1375static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) 1376{ 1377 idetape_tape_t *tape = drive->driver_data; 1378 1379 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1380 1381 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1382 blocks, tape->merge_bh); 1383} 1384 1385static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 1386{ 1387 idetape_tape_t *tape = drive->driver_data; 1388 int blocks, min; 1389 struct idetape_bh *bh; 1390 1391 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 1392 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 1393 " but we are not writing.\n"); 1394 return; 1395 } 1396 if (tape->merge_bh_size > tape->buffer_size) { 1397 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 1398 tape->merge_bh_size = tape->buffer_size; 1399 } 1400 if (tape->merge_bh_size) { 1401 blocks = tape->merge_bh_size / tape->blk_size; 1402 if (tape->merge_bh_size % tape->blk_size) { 1403 unsigned int i; 1404 1405 blocks++; 1406 i = tape->blk_size - tape->merge_bh_size % 1407 tape->blk_size; 1408 bh = tape->bh->b_reqnext; 1409 while (bh) { 1410 atomic_set(&bh->b_count, 0); 1411 bh = bh->b_reqnext; 1412 } 1413 bh = tape->bh; 1414 while (i) { 1415 if (bh == NULL) { 1416 printk(KERN_INFO "ide-tape: bug," 1417 " bh NULL\n"); 1418 break; 1419 } 1420 min = min(i, (unsigned int)(bh->b_size - 1421 atomic_read(&bh->b_count))); 1422 memset(bh->b_data + atomic_read(&bh->b_count), 1423 0, min); 1424 atomic_add(min, &bh->b_count); 1425 i -= min; 1426 bh = bh->b_reqnext; 1427 } 1428 } 1429 (void) idetape_add_chrdev_write_request(drive, blocks); 1430 tape->merge_bh_size = 0; 1431 } 1432 if (tape->merge_bh != NULL) { 1433 ide_tape_kfree_buffer(tape); 1434 tape->merge_bh = NULL; 1435 } 1436 tape->chrdev_dir = IDETAPE_DIR_NONE; 1437} 1438 1439static int idetape_init_read(ide_drive_t *drive) 1440{ 1441 idetape_tape_t *tape = drive->driver_data; 1442 int bytes_read; 1443 1444 /* Initialize read operation */ 1445 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1446 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1447 ide_tape_flush_merge_buffer(drive); 1448 idetape_flush_tape_buffers(drive); 1449 } 1450 if (tape->merge_bh || tape->merge_bh_size) { 1451 printk(KERN_ERR "ide-tape: merge_bh_size should be" 1452 " 0 now\n"); 1453 tape->merge_bh_size = 0; 1454 } 1455 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); 1456 if (!tape->merge_bh) 1457 return -ENOMEM; 1458 tape->chrdev_dir = IDETAPE_DIR_READ; 1459 1460 /* 1461 * Issue a read 0 command to ensure that DSC handshake is 1462 * switched from completion mode to buffer available mode. 1463 * No point in issuing this if DSC overlap isn't supported, some 1464 * drives (Seagate STT3401A) will return an error. 1465 */ 1466 if (drive->dsc_overlap) { 1467 bytes_read = idetape_queue_rw_tail(drive, 1468 REQ_IDETAPE_READ, 0, 1469 tape->merge_bh); 1470 if (bytes_read < 0) { 1471 ide_tape_kfree_buffer(tape); 1472 tape->merge_bh = NULL; 1473 tape->chrdev_dir = IDETAPE_DIR_NONE; 1474 return bytes_read; 1475 } 1476 } 1477 } 1478 1479 return 0; 1480} 1481 1482/* called from idetape_chrdev_read() to service a chrdev read request. */ 1483static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) 1484{ 1485 idetape_tape_t *tape = drive->driver_data; 1486 1487 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); 1488 1489 /* If we are at a filemark, return a read length of 0 */ 1490 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1491 return 0; 1492 1493 idetape_init_read(drive); 1494 1495 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, 1496 tape->merge_bh); 1497} 1498 1499static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1500{ 1501 idetape_tape_t *tape = drive->driver_data; 1502 struct idetape_bh *bh; 1503 int blocks; 1504 1505 while (bcount) { 1506 unsigned int count; 1507 1508 bh = tape->merge_bh; 1509 count = min(tape->buffer_size, bcount); 1510 bcount -= count; 1511 blocks = count / tape->blk_size; 1512 while (count) { 1513 atomic_set(&bh->b_count, 1514 min(count, (unsigned int)bh->b_size)); 1515 memset(bh->b_data, 0, atomic_read(&bh->b_count)); 1516 count -= atomic_read(&bh->b_count); 1517 bh = bh->b_reqnext; 1518 } 1519 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, 1520 tape->merge_bh); 1521 } 1522} 1523 1524/* 1525 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1526 * currently support only one partition. 1527 */ 1528static int idetape_rewind_tape(ide_drive_t *drive) 1529{ 1530 struct ide_tape_obj *tape = drive->driver_data; 1531 struct gendisk *disk = tape->disk; 1532 int retval; 1533 struct ide_atapi_pc pc; 1534 1535 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1536 1537 idetape_create_rewind_cmd(drive, &pc); 1538 retval = ide_queue_pc_tail(drive, disk, &pc); 1539 if (retval) 1540 return retval; 1541 1542 idetape_create_read_position_cmd(&pc); 1543 retval = ide_queue_pc_tail(drive, disk, &pc); 1544 if (retval) 1545 return retval; 1546 return 0; 1547} 1548 1549/* mtio.h compatible commands should be issued to the chrdev interface. */ 1550static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1551 unsigned long arg) 1552{ 1553 idetape_tape_t *tape = drive->driver_data; 1554 void __user *argp = (void __user *)arg; 1555 1556 struct idetape_config { 1557 int dsc_rw_frequency; 1558 int dsc_media_access_frequency; 1559 int nr_stages; 1560 } config; 1561 1562 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1563 1564 switch (cmd) { 1565 case 0x0340: 1566 if (copy_from_user(&config, argp, sizeof(config))) 1567 return -EFAULT; 1568 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1569 break; 1570 case 0x0350: 1571 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1572 config.nr_stages = 1; 1573 if (copy_to_user(argp, &config, sizeof(config))) 1574 return -EFAULT; 1575 break; 1576 default: 1577 return -EIO; 1578 } 1579 return 0; 1580} 1581 1582static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1583 int mt_count) 1584{ 1585 idetape_tape_t *tape = drive->driver_data; 1586 struct gendisk *disk = tape->disk; 1587 struct ide_atapi_pc pc; 1588 int retval, count = 0; 1589 int sprev = !!(tape->caps[4] & 0x20); 1590 1591 if (mt_count == 0) 1592 return 0; 1593 if (MTBSF == mt_op || MTBSFM == mt_op) { 1594 if (!sprev) 1595 return -EIO; 1596 mt_count = -mt_count; 1597 } 1598 1599 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1600 tape->merge_bh_size = 0; 1601 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1602 ++count; 1603 ide_tape_discard_merge_buffer(drive, 0); 1604 } 1605 1606 switch (mt_op) { 1607 case MTFSF: 1608 case MTBSF: 1609 idetape_create_space_cmd(&pc, mt_count - count, 1610 IDETAPE_SPACE_OVER_FILEMARK); 1611 return ide_queue_pc_tail(drive, disk, &pc); 1612 case MTFSFM: 1613 case MTBSFM: 1614 if (!sprev) 1615 return -EIO; 1616 retval = idetape_space_over_filemarks(drive, MTFSF, 1617 mt_count - count); 1618 if (retval) 1619 return retval; 1620 count = (MTBSFM == mt_op ? 1 : -1); 1621 return idetape_space_over_filemarks(drive, MTFSF, count); 1622 default: 1623 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1624 mt_op); 1625 return -EIO; 1626 } 1627} 1628 1629/* 1630 * Our character device read / write functions. 1631 * 1632 * The tape is optimized to maximize throughput when it is transferring an 1633 * integral number of the "continuous transfer limit", which is a parameter of 1634 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1635 * 1636 * As of version 1.3 of the driver, the character device provides an abstract 1637 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1638 * same backup/restore procedure is supported. The driver will internally 1639 * convert the requests to the recommended transfer unit, so that an unmatch 1640 * between the user's block size to the recommended size will only result in a 1641 * (slightly) increased driver overhead, but will no longer hit performance. 1642 * This is not applicable to Onstream. 1643 */ 1644static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1645 size_t count, loff_t *ppos) 1646{ 1647 struct ide_tape_obj *tape = ide_tape_f(file); 1648 ide_drive_t *drive = tape->drive; 1649 ssize_t bytes_read, temp, actually_read = 0, rc; 1650 ssize_t ret = 0; 1651 u16 ctl = *(u16 *)&tape->caps[12]; 1652 1653 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1654 1655 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1656 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1657 if (count > tape->blk_size && 1658 (count % tape->blk_size) == 0) 1659 tape->user_bs_factor = count / tape->blk_size; 1660 } 1661 rc = idetape_init_read(drive); 1662 if (rc < 0) 1663 return rc; 1664 if (count == 0) 1665 return (0); 1666 if (tape->merge_bh_size) { 1667 actually_read = min((unsigned int)(tape->merge_bh_size), 1668 (unsigned int)count); 1669 if (idetape_copy_stage_to_user(tape, buf, actually_read)) 1670 ret = -EFAULT; 1671 buf += actually_read; 1672 tape->merge_bh_size -= actually_read; 1673 count -= actually_read; 1674 } 1675 while (count >= tape->buffer_size) { 1676 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1677 if (bytes_read <= 0) 1678 goto finish; 1679 if (idetape_copy_stage_to_user(tape, buf, bytes_read)) 1680 ret = -EFAULT; 1681 buf += bytes_read; 1682 count -= bytes_read; 1683 actually_read += bytes_read; 1684 } 1685 if (count) { 1686 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1687 if (bytes_read <= 0) 1688 goto finish; 1689 temp = min((unsigned long)count, (unsigned long)bytes_read); 1690 if (idetape_copy_stage_to_user(tape, buf, temp)) 1691 ret = -EFAULT; 1692 actually_read += temp; 1693 tape->merge_bh_size = bytes_read-temp; 1694 } 1695finish: 1696 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1697 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1698 1699 idetape_space_over_filemarks(drive, MTFSF, 1); 1700 return 0; 1701 } 1702 1703 return ret ? ret : actually_read; 1704} 1705 1706static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1707 size_t count, loff_t *ppos) 1708{ 1709 struct ide_tape_obj *tape = ide_tape_f(file); 1710 ide_drive_t *drive = tape->drive; 1711 ssize_t actually_written = 0; 1712 ssize_t ret = 0; 1713 u16 ctl = *(u16 *)&tape->caps[12]; 1714 1715 /* The drive is write protected. */ 1716 if (tape->write_prot) 1717 return -EACCES; 1718 1719 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1720 1721 /* Initialize write operation */ 1722 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 1723 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1724 ide_tape_discard_merge_buffer(drive, 1); 1725 if (tape->merge_bh || tape->merge_bh_size) { 1726 printk(KERN_ERR "ide-tape: merge_bh_size " 1727 "should be 0 now\n"); 1728 tape->merge_bh_size = 0; 1729 } 1730 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); 1731 if (!tape->merge_bh) 1732 return -ENOMEM; 1733 tape->chrdev_dir = IDETAPE_DIR_WRITE; 1734 idetape_init_merge_buffer(tape); 1735 1736 /* 1737 * Issue a write 0 command to ensure that DSC handshake is 1738 * switched from completion mode to buffer available mode. No 1739 * point in issuing this if DSC overlap isn't supported, some 1740 * drives (Seagate STT3401A) will return an error. 1741 */ 1742 if (drive->dsc_overlap) { 1743 ssize_t retval = idetape_queue_rw_tail(drive, 1744 REQ_IDETAPE_WRITE, 0, 1745 tape->merge_bh); 1746 if (retval < 0) { 1747 ide_tape_kfree_buffer(tape); 1748 tape->merge_bh = NULL; 1749 tape->chrdev_dir = IDETAPE_DIR_NONE; 1750 return retval; 1751 } 1752 } 1753 } 1754 if (count == 0) 1755 return (0); 1756 if (tape->merge_bh_size) { 1757 if (tape->merge_bh_size >= tape->buffer_size) { 1758 printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); 1759 tape->merge_bh_size = 0; 1760 } 1761 actually_written = min((unsigned int) 1762 (tape->buffer_size - tape->merge_bh_size), 1763 (unsigned int)count); 1764 if (idetape_copy_stage_from_user(tape, buf, actually_written)) 1765 ret = -EFAULT; 1766 buf += actually_written; 1767 tape->merge_bh_size += actually_written; 1768 count -= actually_written; 1769 1770 if (tape->merge_bh_size == tape->buffer_size) { 1771 ssize_t retval; 1772 tape->merge_bh_size = 0; 1773 retval = idetape_add_chrdev_write_request(drive, ctl); 1774 if (retval <= 0) 1775 return (retval); 1776 } 1777 } 1778 while (count >= tape->buffer_size) { 1779 ssize_t retval; 1780 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) 1781 ret = -EFAULT; 1782 buf += tape->buffer_size; 1783 count -= tape->buffer_size; 1784 retval = idetape_add_chrdev_write_request(drive, ctl); 1785 actually_written += tape->buffer_size; 1786 if (retval <= 0) 1787 return (retval); 1788 } 1789 if (count) { 1790 actually_written += count; 1791 if (idetape_copy_stage_from_user(tape, buf, count)) 1792 ret = -EFAULT; 1793 tape->merge_bh_size += count; 1794 } 1795 return ret ? ret : actually_written; 1796} 1797 1798static int idetape_write_filemark(ide_drive_t *drive) 1799{ 1800 struct ide_tape_obj *tape = drive->driver_data; 1801 struct ide_atapi_pc pc; 1802 1803 /* Write a filemark */ 1804 idetape_create_write_filemark_cmd(drive, &pc, 1); 1805 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1806 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1807 return -EIO; 1808 } 1809 return 0; 1810} 1811 1812/* 1813 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1814 * requested. 1815 * 1816 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1817 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1818 * usually not supported. 1819 * 1820 * The following commands are currently not supported: 1821 * 1822 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1823 * MT_ST_WRITE_THRESHOLD. 1824 */ 1825static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1826{ 1827 idetape_tape_t *tape = drive->driver_data; 1828 struct gendisk *disk = tape->disk; 1829 struct ide_atapi_pc pc; 1830 int i, retval; 1831 1832 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1833 mt_op, mt_count); 1834 1835 switch (mt_op) { 1836 case MTFSF: 1837 case MTFSFM: 1838 case MTBSF: 1839 case MTBSFM: 1840 if (!mt_count) 1841 return 0; 1842 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1843 default: 1844 break; 1845 } 1846 1847 switch (mt_op) { 1848 case MTWEOF: 1849 if (tape->write_prot) 1850 return -EACCES; 1851 ide_tape_discard_merge_buffer(drive, 1); 1852 for (i = 0; i < mt_count; i++) { 1853 retval = idetape_write_filemark(drive); 1854 if (retval) 1855 return retval; 1856 } 1857 return 0; 1858 case MTREW: 1859 ide_tape_discard_merge_buffer(drive, 0); 1860 if (idetape_rewind_tape(drive)) 1861 return -EIO; 1862 return 0; 1863 case MTLOAD: 1864 ide_tape_discard_merge_buffer(drive, 0); 1865 idetape_create_load_unload_cmd(drive, &pc, 1866 IDETAPE_LU_LOAD_MASK); 1867 return ide_queue_pc_tail(drive, disk, &pc); 1868 case MTUNLOAD: 1869 case MTOFFL: 1870 /* 1871 * If door is locked, attempt to unlock before 1872 * attempting to eject. 1873 */ 1874 if (tape->door_locked) { 1875 if (!ide_tape_set_media_lock(drive, 0)) 1876 tape->door_locked = DOOR_UNLOCKED; 1877 } 1878 ide_tape_discard_merge_buffer(drive, 0); 1879 idetape_create_load_unload_cmd(drive, &pc, 1880 !IDETAPE_LU_LOAD_MASK); 1881 retval = ide_queue_pc_tail(drive, disk, &pc); 1882 if (!retval) 1883 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1884 return retval; 1885 case MTNOP: 1886 ide_tape_discard_merge_buffer(drive, 0); 1887 return idetape_flush_tape_buffers(drive); 1888 case MTRETEN: 1889 ide_tape_discard_merge_buffer(drive, 0); 1890 idetape_create_load_unload_cmd(drive, &pc, 1891 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1892 return ide_queue_pc_tail(drive, disk, &pc); 1893 case MTEOM: 1894 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1895 return ide_queue_pc_tail(drive, disk, &pc); 1896 case MTERASE: 1897 (void)idetape_rewind_tape(drive); 1898 idetape_create_erase_cmd(&pc); 1899 return ide_queue_pc_tail(drive, disk, &pc); 1900 case MTSETBLK: 1901 if (mt_count) { 1902 if (mt_count < tape->blk_size || 1903 mt_count % tape->blk_size) 1904 return -EIO; 1905 tape->user_bs_factor = mt_count / tape->blk_size; 1906 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1907 } else 1908 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1909 return 0; 1910 case MTSEEK: 1911 ide_tape_discard_merge_buffer(drive, 0); 1912 return idetape_position_tape(drive, 1913 mt_count * tape->user_bs_factor, tape->partition, 0); 1914 case MTSETPART: 1915 ide_tape_discard_merge_buffer(drive, 0); 1916 return idetape_position_tape(drive, 0, mt_count, 0); 1917 case MTFSR: 1918 case MTBSR: 1919 case MTLOCK: 1920 retval = ide_tape_set_media_lock(drive, 1); 1921 if (retval) 1922 return retval; 1923 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1924 return 0; 1925 case MTUNLOCK: 1926 retval = ide_tape_set_media_lock(drive, 0); 1927 if (retval) 1928 return retval; 1929 tape->door_locked = DOOR_UNLOCKED; 1930 return 0; 1931 default: 1932 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1933 mt_op); 1934 return -EIO; 1935 } 1936} 1937 1938/* 1939 * Our character device ioctls. General mtio.h magnetic io commands are 1940 * supported here, and not in the corresponding block interface. Our own 1941 * ide-tape ioctls are supported on both interfaces. 1942 */ 1943static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1944 unsigned int cmd, unsigned long arg) 1945{ 1946 struct ide_tape_obj *tape = ide_tape_f(file); 1947 ide_drive_t *drive = tape->drive; 1948 struct mtop mtop; 1949 struct mtget mtget; 1950 struct mtpos mtpos; 1951 int block_offset = 0, position = tape->first_frame; 1952 void __user *argp = (void __user *)arg; 1953 1954 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1955 1956 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1957 ide_tape_flush_merge_buffer(drive); 1958 idetape_flush_tape_buffers(drive); 1959 } 1960 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1961 block_offset = tape->merge_bh_size / 1962 (tape->blk_size * tape->user_bs_factor); 1963 position = idetape_read_position(drive); 1964 if (position < 0) 1965 return -EIO; 1966 } 1967 switch (cmd) { 1968 case MTIOCTOP: 1969 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1970 return -EFAULT; 1971 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1972 case MTIOCGET: 1973 memset(&mtget, 0, sizeof(struct mtget)); 1974 mtget.mt_type = MT_ISSCSI2; 1975 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1976 mtget.mt_dsreg = 1977 ((tape->blk_size * tape->user_bs_factor) 1978 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1979 1980 if (tape->drv_write_prot) 1981 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1982 1983 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1984 return -EFAULT; 1985 return 0; 1986 case MTIOCPOS: 1987 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1988 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1989 return -EFAULT; 1990 return 0; 1991 default: 1992 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1993 ide_tape_discard_merge_buffer(drive, 1); 1994 return idetape_blkdev_ioctl(drive, cmd, arg); 1995 } 1996} 1997 1998/* 1999 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 2000 * block size with the reported value. 2001 */ 2002static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 2003{ 2004 idetape_tape_t *tape = drive->driver_data; 2005 struct ide_atapi_pc pc; 2006 2007 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 2008 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 2009 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 2010 if (tape->blk_size == 0) { 2011 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 2012 "block size, assuming 32k\n"); 2013 tape->blk_size = 32768; 2014 } 2015 return; 2016 } 2017 tape->blk_size = (pc.buf[4 + 5] << 16) + 2018 (pc.buf[4 + 6] << 8) + 2019 pc.buf[4 + 7]; 2020 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 2021} 2022 2023static int idetape_chrdev_open(struct inode *inode, struct file *filp) 2024{ 2025 unsigned int minor = iminor(inode), i = minor & ~0xc0; 2026 ide_drive_t *drive; 2027 idetape_tape_t *tape; 2028 int retval; 2029 2030 if (i >= MAX_HWIFS * MAX_DRIVES) 2031 return -ENXIO; 2032 2033 lock_kernel(); 2034 tape = ide_tape_chrdev_get(i); 2035 if (!tape) { 2036 unlock_kernel(); 2037 return -ENXIO; 2038 } 2039 2040 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 2041 2042 /* 2043 * We really want to do nonseekable_open(inode, filp); here, but some 2044 * versions of tar incorrectly call lseek on tapes and bail out if that 2045 * fails. So we disallow pread() and pwrite(), but permit lseeks. 2046 */ 2047 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 2048 2049 drive = tape->drive; 2050 2051 filp->private_data = tape; 2052 2053 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 2054 retval = -EBUSY; 2055 goto out_put_tape; 2056 } 2057 2058 retval = idetape_wait_ready(drive, 60 * HZ); 2059 if (retval) { 2060 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 2061 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 2062 goto out_put_tape; 2063 } 2064 2065 idetape_read_position(drive); 2066 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 2067 (void)idetape_rewind_tape(drive); 2068 2069 /* Read block size and write protect status from drive. */ 2070 ide_tape_get_bsize_from_bdesc(drive); 2071 2072 /* Set write protect flag if device is opened as read-only. */ 2073 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 2074 tape->write_prot = 1; 2075 else 2076 tape->write_prot = tape->drv_write_prot; 2077 2078 /* Make sure drive isn't write protected if user wants to write. */ 2079 if (tape->write_prot) { 2080 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 2081 (filp->f_flags & O_ACCMODE) == O_RDWR) { 2082 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 2083 retval = -EROFS; 2084 goto out_put_tape; 2085 } 2086 } 2087 2088 /* Lock the tape drive door so user can't eject. */ 2089 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 2090 if (!ide_tape_set_media_lock(drive, 1)) { 2091 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 2092 tape->door_locked = DOOR_LOCKED; 2093 } 2094 } 2095 unlock_kernel(); 2096 return 0; 2097 2098out_put_tape: 2099 ide_tape_put(tape); 2100 unlock_kernel(); 2101 return retval; 2102} 2103 2104static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 2105{ 2106 idetape_tape_t *tape = drive->driver_data; 2107 2108 ide_tape_flush_merge_buffer(drive); 2109 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); 2110 if (tape->merge_bh != NULL) { 2111 idetape_pad_zeros(drive, tape->blk_size * 2112 (tape->user_bs_factor - 1)); 2113 ide_tape_kfree_buffer(tape); 2114 tape->merge_bh = NULL; 2115 } 2116 idetape_write_filemark(drive); 2117 idetape_flush_tape_buffers(drive); 2118 idetape_flush_tape_buffers(drive); 2119} 2120 2121static int idetape_chrdev_release(struct inode *inode, struct file *filp) 2122{ 2123 struct ide_tape_obj *tape = ide_tape_f(filp); 2124 ide_drive_t *drive = tape->drive; 2125 unsigned int minor = iminor(inode); 2126 2127 lock_kernel(); 2128 tape = drive->driver_data; 2129 2130 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 2131 2132 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 2133 idetape_write_release(drive, minor); 2134 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 2135 if (minor < 128) 2136 ide_tape_discard_merge_buffer(drive, 1); 2137 } 2138 2139 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 2140 (void) idetape_rewind_tape(drive); 2141 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 2142 if (tape->door_locked == DOOR_LOCKED) { 2143 if (!ide_tape_set_media_lock(drive, 0)) 2144 tape->door_locked = DOOR_UNLOCKED; 2145 } 2146 } 2147 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 2148 ide_tape_put(tape); 2149 unlock_kernel(); 2150 return 0; 2151} 2152 2153static void idetape_get_inquiry_results(ide_drive_t *drive) 2154{ 2155 idetape_tape_t *tape = drive->driver_data; 2156 struct ide_atapi_pc pc; 2157 char fw_rev[4], vendor_id[8], product_id[16]; 2158 2159 idetape_create_inquiry_cmd(&pc); 2160 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 2161 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 2162 tape->name); 2163 return; 2164 } 2165 memcpy(vendor_id, &pc.buf[8], 8); 2166 memcpy(product_id, &pc.buf[16], 16); 2167 memcpy(fw_rev, &pc.buf[32], 4); 2168 2169 ide_fixstring(vendor_id, 8, 0); 2170 ide_fixstring(product_id, 16, 0); 2171 ide_fixstring(fw_rev, 4, 0); 2172 2173 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 2174 drive->name, tape->name, vendor_id, product_id, fw_rev); 2175} 2176 2177/* 2178 * Ask the tape about its various parameters. In particular, we will adjust our 2179 * data transfer buffer size to the recommended value as returned by the tape. 2180 */ 2181static void idetape_get_mode_sense_results(ide_drive_t *drive) 2182{ 2183 idetape_tape_t *tape = drive->driver_data; 2184 struct ide_atapi_pc pc; 2185 u8 *caps; 2186 u8 speed, max_speed; 2187 2188 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 2189 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 2190 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 2191 " some default values\n"); 2192 tape->blk_size = 512; 2193 put_unaligned(52, (u16 *)&tape->caps[12]); 2194 put_unaligned(540, (u16 *)&tape->caps[14]); 2195 put_unaligned(6*52, (u16 *)&tape->caps[16]); 2196 return; 2197 } 2198 caps = pc.buf + 4 + pc.buf[3]; 2199 2200 /* convert to host order and save for later use */ 2201 speed = be16_to_cpup((__be16 *)&caps[14]); 2202 max_speed = be16_to_cpup((__be16 *)&caps[8]); 2203 2204 *(u16 *)&caps[8] = max_speed; 2205 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 2206 *(u16 *)&caps[14] = speed; 2207 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 2208 2209 if (!speed) { 2210 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 2211 "(assuming 650KB/sec)\n", drive->name); 2212 *(u16 *)&caps[14] = 650; 2213 } 2214 if (!max_speed) { 2215 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 2216 "(assuming 650KB/sec)\n", drive->name); 2217 *(u16 *)&caps[8] = 650; 2218 } 2219 2220 memcpy(&tape->caps, caps, 20); 2221 if (caps[7] & 0x02) 2222 tape->blk_size = 512; 2223 else if (caps[7] & 0x04) 2224 tape->blk_size = 1024; 2225} 2226 2227#ifdef CONFIG_IDE_PROC_FS 2228#define ide_tape_devset_get(name, field) \ 2229static int get_##name(ide_drive_t *drive) \ 2230{ \ 2231 idetape_tape_t *tape = drive->driver_data; \ 2232 return tape->field; \ 2233} 2234 2235#define ide_tape_devset_set(name, field) \ 2236static int set_##name(ide_drive_t *drive, int arg) \ 2237{ \ 2238 idetape_tape_t *tape = drive->driver_data; \ 2239 tape->field = arg; \ 2240 return 0; \ 2241} 2242 2243#define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \ 2244ide_tape_devset_get(_name, _field) \ 2245ide_tape_devset_set(_name, _field) \ 2246__IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf) 2247 2248#define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \ 2249ide_tape_devset_get(_name, _field) \ 2250__IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf) 2251 2252static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 2253static int divf_tdsc(ide_drive_t *drive) { return HZ; } 2254static int divf_buffer(ide_drive_t *drive) { return 2; } 2255static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 2256 2257ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap); 2258 2259ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL); 2260ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 2261 best_dsc_rw_freq, mulf_tdsc, divf_tdsc); 2262 2263ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL); 2264ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL); 2265ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer); 2266ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size); 2267 2268static const struct ide_devset *idetape_settings[] = { 2269 &ide_devset_avg_speed, 2270 &ide_devset_buffer, 2271 &ide_devset_buffer_size, 2272 &ide_devset_debug_mask, 2273 &ide_devset_dsc_overlap, 2274 &ide_devset_speed, 2275 &ide_devset_tdsc, 2276 NULL 2277}; 2278#endif 2279 2280/* 2281 * The function below is called to: 2282 * 2283 * 1. Initialize our various state variables. 2284 * 2. Ask the tape for its capabilities. 2285 * 3. Allocate a buffer which will be used for data transfer. The buffer size 2286 * is chosen based on the recommendation which we received in step 2. 2287 * 2288 * Note that at this point ide.c already assigned us an irq, so that we can 2289 * queue requests here and wait for their completion. 2290 */ 2291static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 2292{ 2293 unsigned long t; 2294 int speed; 2295 int buffer_size; 2296 u8 gcw[2]; 2297 u16 *ctl = (u16 *)&tape->caps[12]; 2298 2299 drive->pc_callback = ide_tape_callback; 2300 2301 spin_lock_init(&tape->lock); 2302 drive->dsc_overlap = 1; 2303 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 2304 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 2305 tape->name); 2306 drive->dsc_overlap = 0; 2307 } 2308 /* Seagate Travan drives do not support DSC overlap. */ 2309 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 2310 drive->dsc_overlap = 0; 2311 tape->minor = minor; 2312 tape->name[0] = 'h'; 2313 tape->name[1] = 't'; 2314 tape->name[2] = '0' + minor; 2315 tape->chrdev_dir = IDETAPE_DIR_NONE; 2316 2317 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; 2318 2319 /* Command packet DRQ type */ 2320 if (((gcw[0] & 0x60) >> 5) == 1) 2321 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); 2322 2323 idetape_get_inquiry_results(drive); 2324 idetape_get_mode_sense_results(drive); 2325 ide_tape_get_bsize_from_bdesc(drive); 2326 tape->user_bs_factor = 1; 2327 tape->buffer_size = *ctl * tape->blk_size; 2328 while (tape->buffer_size > 0xffff) { 2329 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 2330 *ctl /= 2; 2331 tape->buffer_size = *ctl * tape->blk_size; 2332 } 2333 buffer_size = tape->buffer_size; 2334 tape->pages_per_buffer = buffer_size / PAGE_SIZE; 2335 if (buffer_size % PAGE_SIZE) { 2336 tape->pages_per_buffer++; 2337 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; 2338 } 2339 2340 /* select the "best" DSC read/write polling freq */ 2341 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 2342 2343 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 2344 2345 /* 2346 * Ensure that the number we got makes sense; limit it within 2347 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 2348 */ 2349 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 2350 IDETAPE_DSC_RW_MAX); 2351 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 2352 "%lums tDSC%s\n", 2353 drive->name, tape->name, *(u16 *)&tape->caps[14], 2354 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 2355 tape->buffer_size / 1024, 2356 tape->best_dsc_rw_freq * 1000 / HZ, 2357 drive->using_dma ? ", DMA":""); 2358 2359 ide_proc_register_driver(drive, tape->driver); 2360} 2361 2362static void ide_tape_remove(ide_drive_t *drive) 2363{ 2364 idetape_tape_t *tape = drive->driver_data; 2365 2366 ide_proc_unregister_driver(drive, tape->driver); 2367 2368 ide_unregister_region(tape->disk); 2369 2370 ide_tape_put(tape); 2371} 2372 2373static void ide_tape_release(struct kref *kref) 2374{ 2375 struct ide_tape_obj *tape = to_ide_tape(kref); 2376 ide_drive_t *drive = tape->drive; 2377 struct gendisk *g = tape->disk; 2378 2379 BUG_ON(tape->merge_bh_size); 2380 2381 drive->dsc_overlap = 0; 2382 drive->driver_data = NULL; 2383 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 2384 device_destroy(idetape_sysfs_class, 2385 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 2386 idetape_devs[tape->minor] = NULL; 2387 g->private_data = NULL; 2388 put_disk(g); 2389 kfree(tape); 2390} 2391 2392#ifdef CONFIG_IDE_PROC_FS 2393static int proc_idetape_read_name 2394 (char *page, char **start, off_t off, int count, int *eof, void *data) 2395{ 2396 ide_drive_t *drive = (ide_drive_t *) data; 2397 idetape_tape_t *tape = drive->driver_data; 2398 char *out = page; 2399 int len; 2400 2401 len = sprintf(out, "%s\n", tape->name); 2402 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 2403} 2404 2405static ide_proc_entry_t idetape_proc[] = { 2406 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 2407 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 2408 { NULL, 0, NULL, NULL } 2409}; 2410#endif 2411 2412static int ide_tape_probe(ide_drive_t *); 2413 2414static ide_driver_t idetape_driver = { 2415 .gen_driver = { 2416 .owner = THIS_MODULE, 2417 .name = "ide-tape", 2418 .bus = &ide_bus_type, 2419 }, 2420 .probe = ide_tape_probe, 2421 .remove = ide_tape_remove, 2422 .version = IDETAPE_VERSION, 2423 .media = ide_tape, 2424 .do_request = idetape_do_request, 2425 .end_request = idetape_end_request, 2426 .error = __ide_error, 2427#ifdef CONFIG_IDE_PROC_FS 2428 .proc = idetape_proc, 2429 .settings = idetape_settings, 2430#endif 2431}; 2432 2433/* Our character device supporting functions, passed to register_chrdev. */ 2434static const struct file_operations idetape_fops = { 2435 .owner = THIS_MODULE, 2436 .read = idetape_chrdev_read, 2437 .write = idetape_chrdev_write, 2438 .ioctl = idetape_chrdev_ioctl, 2439 .open = idetape_chrdev_open, 2440 .release = idetape_chrdev_release, 2441}; 2442 2443static int idetape_open(struct inode *inode, struct file *filp) 2444{ 2445 struct gendisk *disk = inode->i_bdev->bd_disk; 2446 struct ide_tape_obj *tape; 2447 2448 tape = ide_tape_get(disk); 2449 if (!tape) 2450 return -ENXIO; 2451 2452 return 0; 2453} 2454 2455static int idetape_release(struct inode *inode, struct file *filp) 2456{ 2457 struct gendisk *disk = inode->i_bdev->bd_disk; 2458 struct ide_tape_obj *tape = ide_tape_g(disk); 2459 2460 ide_tape_put(tape); 2461 2462 return 0; 2463} 2464 2465static int idetape_ioctl(struct inode *inode, struct file *file, 2466 unsigned int cmd, unsigned long arg) 2467{ 2468 struct block_device *bdev = inode->i_bdev; 2469 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); 2470 ide_drive_t *drive = tape->drive; 2471 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 2472 if (err == -EINVAL) 2473 err = idetape_blkdev_ioctl(drive, cmd, arg); 2474 return err; 2475} 2476 2477static struct block_device_operations idetape_block_ops = { 2478 .owner = THIS_MODULE, 2479 .open = idetape_open, 2480 .release = idetape_release, 2481 .ioctl = idetape_ioctl, 2482}; 2483 2484static int ide_tape_probe(ide_drive_t *drive) 2485{ 2486 idetape_tape_t *tape; 2487 struct gendisk *g; 2488 int minor; 2489 2490 if (!strstr("ide-tape", drive->driver_req)) 2491 goto failed; 2492 2493 if (drive->media != ide_tape) 2494 goto failed; 2495 2496 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { 2497 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 2498 " the driver\n", drive->name); 2499 goto failed; 2500 } 2501 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 2502 if (tape == NULL) { 2503 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 2504 drive->name); 2505 goto failed; 2506 } 2507 2508 g = alloc_disk(1 << PARTN_BITS); 2509 if (!g) 2510 goto out_free_tape; 2511 2512 ide_init_disk(g, drive); 2513 2514 kref_init(&tape->kref); 2515 2516 tape->drive = drive; 2517 tape->driver = &idetape_driver; 2518 tape->disk = g; 2519 2520 g->private_data = &tape->driver; 2521 2522 drive->driver_data = tape; 2523 2524 mutex_lock(&idetape_ref_mutex); 2525 for (minor = 0; idetape_devs[minor]; minor++) 2526 ; 2527 idetape_devs[minor] = tape; 2528 mutex_unlock(&idetape_ref_mutex); 2529 2530 idetape_setup(drive, tape, minor); 2531 2532 device_create_drvdata(idetape_sysfs_class, &drive->gendev, 2533 MKDEV(IDETAPE_MAJOR, minor), NULL, 2534 "%s", tape->name); 2535 device_create_drvdata(idetape_sysfs_class, &drive->gendev, 2536 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2537 "n%s", tape->name); 2538 2539 g->fops = &idetape_block_ops; 2540 ide_register_region(g); 2541 2542 return 0; 2543 2544out_free_tape: 2545 kfree(tape); 2546failed: 2547 return -ENODEV; 2548} 2549 2550static void __exit idetape_exit(void) 2551{ 2552 driver_unregister(&idetape_driver.gen_driver); 2553 class_destroy(idetape_sysfs_class); 2554 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2555} 2556 2557static int __init idetape_init(void) 2558{ 2559 int error = 1; 2560 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2561 if (IS_ERR(idetape_sysfs_class)) { 2562 idetape_sysfs_class = NULL; 2563 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2564 error = -EBUSY; 2565 goto out; 2566 } 2567 2568 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2569 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2570 " interface\n"); 2571 error = -EBUSY; 2572 goto out_free_class; 2573 } 2574 2575 error = driver_register(&idetape_driver.gen_driver); 2576 if (error) 2577 goto out_free_driver; 2578 2579 return 0; 2580 2581out_free_driver: 2582 driver_unregister(&idetape_driver.gen_driver); 2583out_free_class: 2584 class_destroy(idetape_sysfs_class); 2585out: 2586 return error; 2587} 2588 2589MODULE_ALIAS("ide:*m-tape*"); 2590module_init(idetape_init); 2591module_exit(idetape_exit); 2592MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2593MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2594MODULE_LICENSE("GPL"); 2595