ide-tape.c revision 6d7003877c2f0578f1c08f66d05c3f72ef4ae596
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 * The following parameter is used to select the point in the internal tape fifo 85 * in which we will start to refill the buffer. Decreasing the following 86 * parameter will improve the system's latency and interactive response, while 87 * using a high value might improve system throughput. 88 */ 89#define IDETAPE_FIFO_THRESHOLD 2 90 91/* 92 * DSC polling parameters. 93 * 94 * Polling for DSC (a single bit in the status register) is a very important 95 * function in ide-tape. There are two cases in which we poll for DSC: 96 * 97 * 1. Before a read/write packet command, to ensure that we can transfer data 98 * from/to the tape's data buffers, without causing an actual media access. 99 * In case the tape is not ready yet, we take out our request from the device 100 * request queue, so that ide.c could service requests from the other device 101 * on the same interface in the meantime. 102 * 103 * 2. After the successful initialization of a "media access packet command", 104 * which is a command that can take a long time to complete (the interval can 105 * range from several seconds to even an hour). Again, we postpone our request 106 * in the middle to free the bus for the other device. The polling frequency 107 * here should be lower than the read/write frequency since those media access 108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 111 * 112 * We also set a timeout for the timer, in case something goes wrong. The 113 * timeout should be longer then the maximum execution time of a tape operation. 114 */ 115 116/* DSC timings. */ 117#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 118#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 119#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 120#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 121#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 122#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 123#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 124 125/*************************** End of tunable parameters ***********************/ 126 127/* tape directions */ 128enum { 129 IDETAPE_DIR_NONE = (1 << 0), 130 IDETAPE_DIR_READ = (1 << 1), 131 IDETAPE_DIR_WRITE = (1 << 2), 132}; 133 134/* Tape door status */ 135#define DOOR_UNLOCKED 0 136#define DOOR_LOCKED 1 137#define DOOR_EXPLICITLY_LOCKED 2 138 139/* Some defines for the SPACE command */ 140#define IDETAPE_SPACE_OVER_FILEMARK 1 141#define IDETAPE_SPACE_TO_EOD 3 142 143/* Some defines for the LOAD UNLOAD command */ 144#define IDETAPE_LU_LOAD_MASK 1 145#define IDETAPE_LU_RETENSION_MASK 2 146#define IDETAPE_LU_EOT_MASK 4 147 148/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 149#define IDETAPE_BLOCK_DESCRIPTOR 0 150#define IDETAPE_CAPABILITIES_PAGE 0x2a 151 152/* 153 * Most of our global data which we need to save even as we leave the driver due 154 * to an interrupt or a timer event is stored in the struct defined below. 155 */ 156typedef struct ide_tape_obj { 157 ide_drive_t *drive; 158 struct ide_driver *driver; 159 struct gendisk *disk; 160 struct device dev; 161 162 /* used by REQ_IDETAPE_{READ,WRITE} requests */ 163 struct ide_atapi_pc queued_pc; 164 165 /* 166 * DSC polling variables. 167 * 168 * While polling for DSC we use postponed_rq to postpone the current 169 * request so that ide.c will be able to service pending requests on the 170 * other device. Note that at most we will have only one DSC (usually 171 * data transfer) request in the device request queue. 172 */ 173 struct request *postponed_rq; 174 /* The time in which we started polling for DSC */ 175 unsigned long dsc_polling_start; 176 /* Timer used to poll for dsc */ 177 struct timer_list dsc_timer; 178 /* Read/Write dsc polling frequency */ 179 unsigned long best_dsc_rw_freq; 180 unsigned long dsc_poll_freq; 181 unsigned long dsc_timeout; 182 183 /* Read position information */ 184 u8 partition; 185 /* Current block */ 186 unsigned int first_frame; 187 188 /* Last error information */ 189 u8 sense_key, asc, ascq; 190 191 /* Character device operation */ 192 unsigned int minor; 193 /* device name */ 194 char name[4]; 195 /* Current character device data transfer direction */ 196 u8 chrdev_dir; 197 198 /* tape block size, usually 512 or 1024 bytes */ 199 unsigned short blk_size; 200 int user_bs_factor; 201 202 /* Copy of the tape's Capabilities and Mechanical Page */ 203 u8 caps[20]; 204 205 /* 206 * Active data transfer request parameters. 207 * 208 * At most, there is only one ide-tape originated data transfer request 209 * in the device request queue. This allows ide.c to easily service 210 * requests from the other device when we postpone our active request. 211 */ 212 213 /* Data buffer size chosen based on the tape's recommendation */ 214 int buffer_size; 215 /* Staging buffer of buffer_size bytes */ 216 void *buf; 217 /* The read/write cursor */ 218 void *cur; 219 /* The number of valid bytes in buf */ 220 size_t valid; 221 222 /* Measures average tape speed */ 223 unsigned long avg_time; 224 int avg_size; 225 int avg_speed; 226 227 /* the door is currently locked */ 228 int door_locked; 229 /* the tape hardware is write protected */ 230 char drv_write_prot; 231 /* the tape is write protected (hardware or opened as read-only) */ 232 char write_prot; 233 234 u32 debug_mask; 235} idetape_tape_t; 236 237static DEFINE_MUTEX(idetape_ref_mutex); 238 239static struct class *idetape_sysfs_class; 240 241static void ide_tape_release(struct device *); 242 243static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 244{ 245 struct ide_tape_obj *tape = NULL; 246 247 mutex_lock(&idetape_ref_mutex); 248 tape = ide_drv_g(disk, ide_tape_obj); 249 if (tape) { 250 if (ide_device_get(tape->drive)) 251 tape = NULL; 252 else 253 get_device(&tape->dev); 254 } 255 mutex_unlock(&idetape_ref_mutex); 256 return tape; 257} 258 259static void ide_tape_put(struct ide_tape_obj *tape) 260{ 261 ide_drive_t *drive = tape->drive; 262 263 mutex_lock(&idetape_ref_mutex); 264 put_device(&tape->dev); 265 ide_device_put(drive); 266 mutex_unlock(&idetape_ref_mutex); 267} 268 269/* 270 * The variables below are used for the character device interface. Additional 271 * state variables are defined in our ide_drive_t structure. 272 */ 273static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 274 275static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 276{ 277 struct ide_tape_obj *tape = NULL; 278 279 mutex_lock(&idetape_ref_mutex); 280 tape = idetape_devs[i]; 281 if (tape) 282 get_device(&tape->dev); 283 mutex_unlock(&idetape_ref_mutex); 284 return tape; 285} 286 287/* 288 * called on each failed packet command retry to analyze the request sense. We 289 * currently do not utilize this information. 290 */ 291static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) 292{ 293 idetape_tape_t *tape = drive->driver_data; 294 struct ide_atapi_pc *pc = drive->failed_pc; 295 296 tape->sense_key = sense[2] & 0xF; 297 tape->asc = sense[12]; 298 tape->ascq = sense[13]; 299 300 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", 301 pc->c[0], tape->sense_key, tape->asc, tape->ascq); 302 303 /* Correct pc->xferred by asking the tape. */ 304 if (pc->flags & PC_FLAG_DMA_ERROR) 305 pc->xferred = pc->req_xfer - 306 tape->blk_size * 307 get_unaligned_be32(&sense[3]); 308 309 /* 310 * If error was the result of a zero-length read or write command, 311 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 312 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 313 */ 314 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 315 /* length == 0 */ 316 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 317 if (tape->sense_key == 5) { 318 /* don't report an error, everything's ok */ 319 pc->error = 0; 320 /* don't retry read/write */ 321 pc->flags |= PC_FLAG_ABORT; 322 } 323 } 324 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 325 pc->error = IDE_DRV_ERROR_FILEMARK; 326 pc->flags |= PC_FLAG_ABORT; 327 } 328 if (pc->c[0] == WRITE_6) { 329 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 330 && tape->asc == 0x0 && tape->ascq == 0x2)) { 331 pc->error = IDE_DRV_ERROR_EOD; 332 pc->flags |= PC_FLAG_ABORT; 333 } 334 } 335 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 336 if (tape->sense_key == 8) { 337 pc->error = IDE_DRV_ERROR_EOD; 338 pc->flags |= PC_FLAG_ABORT; 339 } 340 if (!(pc->flags & PC_FLAG_ABORT) && 341 pc->xferred) 342 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 343 } 344} 345 346static void ide_tape_handle_dsc(ide_drive_t *); 347 348static int ide_tape_callback(ide_drive_t *drive, int dsc) 349{ 350 idetape_tape_t *tape = drive->driver_data; 351 struct ide_atapi_pc *pc = drive->pc; 352 struct request *rq = drive->hwif->rq; 353 int uptodate = pc->error ? 0 : 1; 354 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; 355 356 debug_log(DBG_PROCS, "Enter %s\n", __func__); 357 358 if (dsc) 359 ide_tape_handle_dsc(drive); 360 361 if (drive->failed_pc == pc) 362 drive->failed_pc = NULL; 363 364 if (pc->c[0] == REQUEST_SENSE) { 365 if (uptodate) 366 idetape_analyze_error(drive, pc->buf); 367 else 368 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 369 "itself - Aborting request!\n"); 370 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 371 int blocks = pc->xferred / tape->blk_size; 372 373 tape->avg_size += blocks * tape->blk_size; 374 375 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 376 tape->avg_speed = tape->avg_size * HZ / 377 (jiffies - tape->avg_time) / 1024; 378 tape->avg_size = 0; 379 tape->avg_time = jiffies; 380 } 381 382 tape->first_frame += blocks; 383 rq->data_len -= blocks * tape->blk_size; 384 385 if (pc->error) { 386 uptodate = 0; 387 err = pc->error; 388 } 389 } else if (pc->c[0] == READ_POSITION && uptodate) { 390 u8 *readpos = pc->buf; 391 392 debug_log(DBG_SENSE, "BOP - %s\n", 393 (readpos[0] & 0x80) ? "Yes" : "No"); 394 debug_log(DBG_SENSE, "EOP - %s\n", 395 (readpos[0] & 0x40) ? "Yes" : "No"); 396 397 if (readpos[0] & 0x4) { 398 printk(KERN_INFO "ide-tape: Block location is unknown" 399 "to the tape\n"); 400 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 401 uptodate = 0; 402 err = IDE_DRV_ERROR_GENERAL; 403 } else { 404 debug_log(DBG_SENSE, "Block Location - %u\n", 405 be32_to_cpup((__be32 *)&readpos[4])); 406 407 tape->partition = readpos[1]; 408 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); 409 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 410 } 411 } 412 413 rq->errors = err; 414 415 return uptodate; 416} 417 418/* 419 * Postpone the current request so that ide.c will be able to service requests 420 * from another device on the same port while we are polling for DSC. 421 */ 422static void idetape_postpone_request(ide_drive_t *drive) 423{ 424 idetape_tape_t *tape = drive->driver_data; 425 426 debug_log(DBG_PROCS, "Enter %s\n", __func__); 427 428 tape->postponed_rq = drive->hwif->rq; 429 430 ide_stall_queue(drive, tape->dsc_poll_freq); 431} 432 433static void ide_tape_handle_dsc(ide_drive_t *drive) 434{ 435 idetape_tape_t *tape = drive->driver_data; 436 437 /* Media access command */ 438 tape->dsc_polling_start = jiffies; 439 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 440 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 441 /* Allow ide.c to handle other requests */ 442 idetape_postpone_request(drive); 443} 444 445/* 446 * Packet Command Interface 447 * 448 * The current Packet Command is available in drive->pc, and will not change 449 * until we finish handling it. Each packet command is associated with a 450 * callback function that will be called when the command is finished. 451 * 452 * The handling will be done in three stages: 453 * 454 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set 455 * the interrupt handler to ide_pc_intr. 456 * 457 * 2. On each interrupt, ide_pc_intr will be called. This step will be 458 * repeated until the device signals us that no more interrupts will be issued. 459 * 460 * 3. ATAPI Tape media access commands have immediate status with a delayed 461 * process. In case of a successful initiation of a media access packet command, 462 * the DSC bit will be set when the actual execution of the command is finished. 463 * Since the tape drive will not issue an interrupt, we have to poll for this 464 * event. In this case, we define the request as "low priority request" by 465 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 466 * exit the driver. 467 * 468 * ide.c will then give higher priority to requests which originate from the 469 * other device, until will change rq_status to RQ_ACTIVE. 470 * 471 * 4. When the packet command is finished, it will be checked for errors. 472 * 473 * 5. In case an error was found, we queue a request sense packet command in 474 * front of the request queue and retry the operation up to 475 * IDETAPE_MAX_PC_RETRIES times. 476 * 477 * 6. In case no error was found, or we decided to give up and not to retry 478 * again, the callback function will be called and then we will handle the next 479 * request. 480 */ 481 482static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, 483 struct ide_cmd *cmd, 484 struct ide_atapi_pc *pc) 485{ 486 idetape_tape_t *tape = drive->driver_data; 487 488 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 489 drive->failed_pc = pc; 490 491 /* Set the current packet command */ 492 drive->pc = pc; 493 494 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 495 (pc->flags & PC_FLAG_ABORT)) { 496 unsigned int done = blk_rq_bytes(drive->hwif->rq); 497 498 /* 499 * We will "abort" retrying a packet command in case legitimate 500 * error code was received (crossing a filemark, or end of the 501 * media, for example). 502 */ 503 if (!(pc->flags & PC_FLAG_ABORT)) { 504 if (!(pc->c[0] == TEST_UNIT_READY && 505 tape->sense_key == 2 && tape->asc == 4 && 506 (tape->ascq == 1 || tape->ascq == 8))) { 507 printk(KERN_ERR "ide-tape: %s: I/O error, " 508 "pc = %2x, key = %2x, " 509 "asc = %2x, ascq = %2x\n", 510 tape->name, pc->c[0], 511 tape->sense_key, tape->asc, 512 tape->ascq); 513 } 514 /* Giving up */ 515 pc->error = IDE_DRV_ERROR_GENERAL; 516 } 517 518 drive->failed_pc = NULL; 519 drive->pc_callback(drive, 0); 520 ide_complete_rq(drive, -EIO, done); 521 return ide_stopped; 522 } 523 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); 524 525 pc->retries++; 526 527 return ide_issue_pc(drive, cmd); 528} 529 530/* A mode sense command is used to "sense" tape parameters. */ 531static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 532{ 533 ide_init_pc(pc); 534 pc->c[0] = MODE_SENSE; 535 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 536 /* DBD = 1 - Don't return block descriptors */ 537 pc->c[1] = 8; 538 pc->c[2] = page_code; 539 /* 540 * Changed pc->c[3] to 0 (255 will at best return unused info). 541 * 542 * For SCSI this byte is defined as subpage instead of high byte 543 * of length and some IDE drives seem to interpret it this way 544 * and return an error when 255 is used. 545 */ 546 pc->c[3] = 0; 547 /* We will just discard data in that case */ 548 pc->c[4] = 255; 549 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 550 pc->req_xfer = 12; 551 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 552 pc->req_xfer = 24; 553 else 554 pc->req_xfer = 50; 555} 556 557static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 558{ 559 ide_hwif_t *hwif = drive->hwif; 560 idetape_tape_t *tape = drive->driver_data; 561 struct ide_atapi_pc *pc = drive->pc; 562 u8 stat; 563 564 stat = hwif->tp_ops->read_status(hwif); 565 566 if (stat & ATA_DSC) { 567 if (stat & ATA_ERR) { 568 /* Error detected */ 569 if (pc->c[0] != TEST_UNIT_READY) 570 printk(KERN_ERR "ide-tape: %s: I/O error, ", 571 tape->name); 572 /* Retry operation */ 573 ide_retry_pc(drive); 574 return ide_stopped; 575 } 576 pc->error = 0; 577 } else { 578 pc->error = IDE_DRV_ERROR_GENERAL; 579 drive->failed_pc = NULL; 580 } 581 drive->pc_callback(drive, 0); 582 return ide_stopped; 583} 584 585static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 586 struct ide_atapi_pc *pc, struct request *rq, 587 u8 opcode) 588{ 589 unsigned int length = rq->nr_sectors; 590 591 ide_init_pc(pc); 592 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 593 pc->c[1] = 1; 594 pc->buf = NULL; 595 pc->buf_size = length * tape->blk_size; 596 pc->req_xfer = pc->buf_size; 597 if (pc->req_xfer == tape->buffer_size) 598 pc->flags |= PC_FLAG_DMA_OK; 599 600 if (opcode == READ_6) 601 pc->c[0] = READ_6; 602 else if (opcode == WRITE_6) { 603 pc->c[0] = WRITE_6; 604 pc->flags |= PC_FLAG_WRITING; 605 } 606 607 memcpy(rq->cmd, pc->c, 12); 608} 609 610static ide_startstop_t idetape_do_request(ide_drive_t *drive, 611 struct request *rq, sector_t block) 612{ 613 ide_hwif_t *hwif = drive->hwif; 614 idetape_tape_t *tape = drive->driver_data; 615 struct ide_atapi_pc *pc = NULL; 616 struct request *postponed_rq = tape->postponed_rq; 617 struct ide_cmd cmd; 618 u8 stat; 619 620 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n" 621 (unsigned long long)rq->sector, rq->nr_sectors); 622 623 if (!(blk_special_request(rq) || blk_sense_request(rq))) { 624 /* We do not support buffer cache originated requests. */ 625 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 626 "request queue (%d)\n", drive->name, rq->cmd_type); 627 if (blk_fs_request(rq) == 0 && rq->errors == 0) 628 rq->errors = -EIO; 629 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); 630 return ide_stopped; 631 } 632 633 /* Retry a failed packet command */ 634 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 635 pc = drive->failed_pc; 636 goto out; 637 } 638 639 if (postponed_rq != NULL) 640 if (rq != postponed_rq) { 641 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 642 "Two DSC requests were queued\n"); 643 drive->failed_pc = NULL; 644 rq->errors = 0; 645 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 646 return ide_stopped; 647 } 648 649 tape->postponed_rq = NULL; 650 651 /* 652 * If the tape is still busy, postpone our request and service 653 * the other device meanwhile. 654 */ 655 stat = hwif->tp_ops->read_status(hwif); 656 657 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 658 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 659 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 660 661 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 662 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 663 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 664 } 665 666 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && 667 (stat & ATA_DSC) == 0) { 668 if (postponed_rq == NULL) { 669 tape->dsc_polling_start = jiffies; 670 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 671 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 672 } else if (time_after(jiffies, tape->dsc_timeout)) { 673 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 674 tape->name); 675 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 676 idetape_media_access_finished(drive); 677 return ide_stopped; 678 } else { 679 return ide_do_reset(drive); 680 } 681 } else if (time_after(jiffies, 682 tape->dsc_polling_start + 683 IDETAPE_DSC_MA_THRESHOLD)) 684 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 685 idetape_postpone_request(drive); 686 return ide_stopped; 687 } 688 if (rq->cmd[13] & REQ_IDETAPE_READ) { 689 pc = &tape->queued_pc; 690 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 691 goto out; 692 } 693 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 694 pc = &tape->queued_pc; 695 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 696 goto out; 697 } 698 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 699 pc = (struct ide_atapi_pc *)rq->special; 700 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 701 rq->cmd[13] |= REQ_IDETAPE_PC2; 702 goto out; 703 } 704 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 705 idetape_media_access_finished(drive); 706 return ide_stopped; 707 } 708 BUG(); 709 710out: 711 /* prepare sense request for this command */ 712 ide_prep_sense(drive, rq); 713 714 memset(&cmd, 0, sizeof(cmd)); 715 716 if (rq_data_dir(rq)) 717 cmd.tf_flags |= IDE_TFLAG_WRITE; 718 719 cmd.rq = rq; 720 721 ide_init_sg_cmd(&cmd, pc->req_xfer); 722 ide_map_sg(drive, &cmd); 723 724 return ide_tape_issue_pc(drive, &cmd, pc); 725} 726 727/* 728 * Write a filemark if write_filemark=1. Flush the device buffers without 729 * writing a filemark otherwise. 730 */ 731static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 732 struct ide_atapi_pc *pc, int write_filemark) 733{ 734 ide_init_pc(pc); 735 pc->c[0] = WRITE_FILEMARKS; 736 pc->c[4] = write_filemark; 737 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 738} 739 740static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 741{ 742 idetape_tape_t *tape = drive->driver_data; 743 struct gendisk *disk = tape->disk; 744 int load_attempted = 0; 745 746 /* Wait for the tape to become ready */ 747 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 748 timeout += jiffies; 749 while (time_before(jiffies, timeout)) { 750 if (ide_do_test_unit_ready(drive, disk) == 0) 751 return 0; 752 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 753 || (tape->asc == 0x3A)) { 754 /* no media */ 755 if (load_attempted) 756 return -ENOMEDIUM; 757 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 758 load_attempted = 1; 759 /* not about to be ready */ 760 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 761 (tape->ascq == 1 || tape->ascq == 8))) 762 return -EIO; 763 msleep(100); 764 } 765 return -EIO; 766} 767 768static int idetape_flush_tape_buffers(ide_drive_t *drive) 769{ 770 struct ide_tape_obj *tape = drive->driver_data; 771 struct ide_atapi_pc pc; 772 int rc; 773 774 idetape_create_write_filemark_cmd(drive, &pc, 0); 775 rc = ide_queue_pc_tail(drive, tape->disk, &pc); 776 if (rc) 777 return rc; 778 idetape_wait_ready(drive, 60 * 5 * HZ); 779 return 0; 780} 781 782static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 783{ 784 ide_init_pc(pc); 785 pc->c[0] = READ_POSITION; 786 pc->req_xfer = 20; 787} 788 789static int idetape_read_position(ide_drive_t *drive) 790{ 791 idetape_tape_t *tape = drive->driver_data; 792 struct ide_atapi_pc pc; 793 int position; 794 795 debug_log(DBG_PROCS, "Enter %s\n", __func__); 796 797 idetape_create_read_position_cmd(&pc); 798 if (ide_queue_pc_tail(drive, tape->disk, &pc)) 799 return -1; 800 position = tape->first_frame; 801 return position; 802} 803 804static void idetape_create_locate_cmd(ide_drive_t *drive, 805 struct ide_atapi_pc *pc, 806 unsigned int block, u8 partition, int skip) 807{ 808 ide_init_pc(pc); 809 pc->c[0] = POSITION_TO_ELEMENT; 810 pc->c[1] = 2; 811 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 812 pc->c[8] = partition; 813 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 814} 815 816static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 817{ 818 idetape_tape_t *tape = drive->driver_data; 819 820 if (tape->chrdev_dir != IDETAPE_DIR_READ) 821 return; 822 823 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 824 tape->valid = 0; 825 if (tape->buf != NULL) { 826 kfree(tape->buf); 827 tape->buf = NULL; 828 } 829 830 tape->chrdev_dir = IDETAPE_DIR_NONE; 831} 832 833/* 834 * Position the tape to the requested block using the LOCATE packet command. 835 * A READ POSITION command is then issued to check where we are positioned. Like 836 * all higher level operations, we queue the commands at the tail of the request 837 * queue and wait for their completion. 838 */ 839static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 840 u8 partition, int skip) 841{ 842 idetape_tape_t *tape = drive->driver_data; 843 struct gendisk *disk = tape->disk; 844 int retval; 845 struct ide_atapi_pc pc; 846 847 if (tape->chrdev_dir == IDETAPE_DIR_READ) 848 __ide_tape_discard_merge_buffer(drive); 849 idetape_wait_ready(drive, 60 * 5 * HZ); 850 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 851 retval = ide_queue_pc_tail(drive, disk, &pc); 852 if (retval) 853 return (retval); 854 855 idetape_create_read_position_cmd(&pc); 856 return ide_queue_pc_tail(drive, disk, &pc); 857} 858 859static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 860 int restore_position) 861{ 862 idetape_tape_t *tape = drive->driver_data; 863 int seek, position; 864 865 __ide_tape_discard_merge_buffer(drive); 866 if (restore_position) { 867 position = idetape_read_position(drive); 868 seek = position > 0 ? position : 0; 869 if (idetape_position_tape(drive, seek, 0, 0)) { 870 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 871 " %s\n", tape->name, __func__); 872 return; 873 } 874 } 875} 876 877/* 878 * Generate a read/write request for the block device interface and wait for it 879 * to be serviced. 880 */ 881static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 882{ 883 idetape_tape_t *tape = drive->driver_data; 884 struct request *rq; 885 int ret; 886 887 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 888 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 889 BUG_ON(size < 0 || size % tape->blk_size); 890 891 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 892 rq->cmd_type = REQ_TYPE_SPECIAL; 893 rq->cmd[13] = cmd; 894 rq->rq_disk = tape->disk; 895 rq->sector = tape->first_frame; 896 897 if (size) { 898 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 899 __GFP_WAIT); 900 if (ret) 901 goto out_put; 902 } 903 904 blk_execute_rq(drive->queue, tape->disk, rq, 0); 905 906 /* calculate the number of transferred bytes and update buffer state */ 907 size -= rq->data_len; 908 tape->cur = tape->buf; 909 if (cmd == REQ_IDETAPE_READ) 910 tape->valid = size; 911 else 912 tape->valid = 0; 913 914 ret = size; 915 if (rq->errors == IDE_DRV_ERROR_GENERAL) 916 ret = -EIO; 917out_put: 918 blk_put_request(rq); 919 return ret; 920} 921 922static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 923{ 924 ide_init_pc(pc); 925 pc->c[0] = INQUIRY; 926 pc->c[4] = 254; 927 pc->req_xfer = 254; 928} 929 930static void idetape_create_rewind_cmd(ide_drive_t *drive, 931 struct ide_atapi_pc *pc) 932{ 933 ide_init_pc(pc); 934 pc->c[0] = REZERO_UNIT; 935 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 936} 937 938static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 939{ 940 ide_init_pc(pc); 941 pc->c[0] = ERASE; 942 pc->c[1] = 1; 943 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 944} 945 946static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 947{ 948 ide_init_pc(pc); 949 pc->c[0] = SPACE; 950 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 951 pc->c[1] = cmd; 952 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 953} 954 955static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 956{ 957 idetape_tape_t *tape = drive->driver_data; 958 959 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 960 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 961 " but we are not writing.\n"); 962 return; 963 } 964 if (tape->buf) { 965 size_t aligned = roundup(tape->valid, tape->blk_size); 966 967 memset(tape->cur, 0, aligned - tape->valid); 968 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); 969 kfree(tape->buf); 970 tape->buf = NULL; 971 } 972 tape->chrdev_dir = IDETAPE_DIR_NONE; 973} 974 975static int idetape_init_rw(ide_drive_t *drive, int dir) 976{ 977 idetape_tape_t *tape = drive->driver_data; 978 int rc; 979 980 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 981 982 if (tape->chrdev_dir == dir) 983 return 0; 984 985 if (tape->chrdev_dir == IDETAPE_DIR_READ) 986 ide_tape_discard_merge_buffer(drive, 1); 987 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 988 ide_tape_flush_merge_buffer(drive); 989 idetape_flush_tape_buffers(drive); 990 } 991 992 if (tape->buf || tape->valid) { 993 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 994 tape->valid = 0; 995 } 996 997 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 998 if (!tape->buf) 999 return -ENOMEM; 1000 tape->chrdev_dir = dir; 1001 tape->cur = tape->buf; 1002 1003 /* 1004 * Issue a 0 rw command to ensure that DSC handshake is 1005 * switched from completion mode to buffer available mode. No 1006 * point in issuing this if DSC overlap isn't supported, some 1007 * drives (Seagate STT3401A) will return an error. 1008 */ 1009 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1010 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 1011 : REQ_IDETAPE_WRITE; 1012 1013 rc = idetape_queue_rw_tail(drive, cmd, 0); 1014 if (rc < 0) { 1015 kfree(tape->buf); 1016 tape->buf = NULL; 1017 tape->chrdev_dir = IDETAPE_DIR_NONE; 1018 return rc; 1019 } 1020 } 1021 1022 return 0; 1023} 1024 1025static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1026{ 1027 idetape_tape_t *tape = drive->driver_data; 1028 1029 memset(tape->buf, 0, tape->buffer_size); 1030 1031 while (bcount) { 1032 unsigned int count = min(tape->buffer_size, bcount); 1033 1034 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1035 bcount -= count; 1036 } 1037} 1038 1039/* 1040 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1041 * currently support only one partition. 1042 */ 1043static int idetape_rewind_tape(ide_drive_t *drive) 1044{ 1045 struct ide_tape_obj *tape = drive->driver_data; 1046 struct gendisk *disk = tape->disk; 1047 int retval; 1048 struct ide_atapi_pc pc; 1049 1050 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1051 1052 idetape_create_rewind_cmd(drive, &pc); 1053 retval = ide_queue_pc_tail(drive, disk, &pc); 1054 if (retval) 1055 return retval; 1056 1057 idetape_create_read_position_cmd(&pc); 1058 retval = ide_queue_pc_tail(drive, disk, &pc); 1059 if (retval) 1060 return retval; 1061 return 0; 1062} 1063 1064/* mtio.h compatible commands should be issued to the chrdev interface. */ 1065static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1066 unsigned long arg) 1067{ 1068 idetape_tape_t *tape = drive->driver_data; 1069 void __user *argp = (void __user *)arg; 1070 1071 struct idetape_config { 1072 int dsc_rw_frequency; 1073 int dsc_media_access_frequency; 1074 int nr_stages; 1075 } config; 1076 1077 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1078 1079 switch (cmd) { 1080 case 0x0340: 1081 if (copy_from_user(&config, argp, sizeof(config))) 1082 return -EFAULT; 1083 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1084 break; 1085 case 0x0350: 1086 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1087 config.nr_stages = 1; 1088 if (copy_to_user(argp, &config, sizeof(config))) 1089 return -EFAULT; 1090 break; 1091 default: 1092 return -EIO; 1093 } 1094 return 0; 1095} 1096 1097static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1098 int mt_count) 1099{ 1100 idetape_tape_t *tape = drive->driver_data; 1101 struct gendisk *disk = tape->disk; 1102 struct ide_atapi_pc pc; 1103 int retval, count = 0; 1104 int sprev = !!(tape->caps[4] & 0x20); 1105 1106 if (mt_count == 0) 1107 return 0; 1108 if (MTBSF == mt_op || MTBSFM == mt_op) { 1109 if (!sprev) 1110 return -EIO; 1111 mt_count = -mt_count; 1112 } 1113 1114 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1115 tape->valid = 0; 1116 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1117 ++count; 1118 ide_tape_discard_merge_buffer(drive, 0); 1119 } 1120 1121 switch (mt_op) { 1122 case MTFSF: 1123 case MTBSF: 1124 idetape_create_space_cmd(&pc, mt_count - count, 1125 IDETAPE_SPACE_OVER_FILEMARK); 1126 return ide_queue_pc_tail(drive, disk, &pc); 1127 case MTFSFM: 1128 case MTBSFM: 1129 if (!sprev) 1130 return -EIO; 1131 retval = idetape_space_over_filemarks(drive, MTFSF, 1132 mt_count - count); 1133 if (retval) 1134 return retval; 1135 count = (MTBSFM == mt_op ? 1 : -1); 1136 return idetape_space_over_filemarks(drive, MTFSF, count); 1137 default: 1138 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1139 mt_op); 1140 return -EIO; 1141 } 1142} 1143 1144/* 1145 * Our character device read / write functions. 1146 * 1147 * The tape is optimized to maximize throughput when it is transferring an 1148 * integral number of the "continuous transfer limit", which is a parameter of 1149 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1150 * 1151 * As of version 1.3 of the driver, the character device provides an abstract 1152 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1153 * same backup/restore procedure is supported. The driver will internally 1154 * convert the requests to the recommended transfer unit, so that an unmatch 1155 * between the user's block size to the recommended size will only result in a 1156 * (slightly) increased driver overhead, but will no longer hit performance. 1157 * This is not applicable to Onstream. 1158 */ 1159static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1160 size_t count, loff_t *ppos) 1161{ 1162 struct ide_tape_obj *tape = file->private_data; 1163 ide_drive_t *drive = tape->drive; 1164 size_t done = 0; 1165 ssize_t ret = 0; 1166 int rc; 1167 1168 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1169 1170 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1171 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1172 if (count > tape->blk_size && 1173 (count % tape->blk_size) == 0) 1174 tape->user_bs_factor = count / tape->blk_size; 1175 } 1176 1177 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1178 if (rc < 0) 1179 return rc; 1180 1181 while (done < count) { 1182 size_t todo; 1183 1184 /* refill if staging buffer is empty */ 1185 if (!tape->valid) { 1186 /* If we are at a filemark, nothing more to read */ 1187 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1188 break; 1189 /* read */ 1190 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1191 tape->buffer_size) <= 0) 1192 break; 1193 } 1194 1195 /* copy out */ 1196 todo = min_t(size_t, count - done, tape->valid); 1197 if (copy_to_user(buf + done, tape->cur, todo)) 1198 ret = -EFAULT; 1199 1200 tape->cur += todo; 1201 tape->valid -= todo; 1202 done += todo; 1203 } 1204 1205 if (!done && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1206 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1207 1208 idetape_space_over_filemarks(drive, MTFSF, 1); 1209 return 0; 1210 } 1211 1212 return ret ? ret : done; 1213} 1214 1215static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1216 size_t count, loff_t *ppos) 1217{ 1218 struct ide_tape_obj *tape = file->private_data; 1219 ide_drive_t *drive = tape->drive; 1220 size_t done = 0; 1221 ssize_t ret = 0; 1222 int rc; 1223 1224 /* The drive is write protected. */ 1225 if (tape->write_prot) 1226 return -EACCES; 1227 1228 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1229 1230 /* Initialize write operation */ 1231 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1232 if (rc < 0) 1233 return rc; 1234 1235 while (done < count) { 1236 size_t todo; 1237 1238 /* flush if staging buffer is full */ 1239 if (tape->valid == tape->buffer_size && 1240 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1241 tape->buffer_size) <= 0) 1242 return rc; 1243 1244 /* copy in */ 1245 todo = min_t(size_t, count - done, 1246 tape->buffer_size - tape->valid); 1247 if (copy_from_user(tape->cur, buf + done, todo)) 1248 ret = -EFAULT; 1249 1250 tape->cur += todo; 1251 tape->valid += todo; 1252 done += todo; 1253 } 1254 1255 return ret ? ret : done; 1256} 1257 1258static int idetape_write_filemark(ide_drive_t *drive) 1259{ 1260 struct ide_tape_obj *tape = drive->driver_data; 1261 struct ide_atapi_pc pc; 1262 1263 /* Write a filemark */ 1264 idetape_create_write_filemark_cmd(drive, &pc, 1); 1265 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1266 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1267 return -EIO; 1268 } 1269 return 0; 1270} 1271 1272/* 1273 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1274 * requested. 1275 * 1276 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1277 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1278 * usually not supported. 1279 * 1280 * The following commands are currently not supported: 1281 * 1282 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1283 * MT_ST_WRITE_THRESHOLD. 1284 */ 1285static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1286{ 1287 idetape_tape_t *tape = drive->driver_data; 1288 struct gendisk *disk = tape->disk; 1289 struct ide_atapi_pc pc; 1290 int i, retval; 1291 1292 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1293 mt_op, mt_count); 1294 1295 switch (mt_op) { 1296 case MTFSF: 1297 case MTFSFM: 1298 case MTBSF: 1299 case MTBSFM: 1300 if (!mt_count) 1301 return 0; 1302 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1303 default: 1304 break; 1305 } 1306 1307 switch (mt_op) { 1308 case MTWEOF: 1309 if (tape->write_prot) 1310 return -EACCES; 1311 ide_tape_discard_merge_buffer(drive, 1); 1312 for (i = 0; i < mt_count; i++) { 1313 retval = idetape_write_filemark(drive); 1314 if (retval) 1315 return retval; 1316 } 1317 return 0; 1318 case MTREW: 1319 ide_tape_discard_merge_buffer(drive, 0); 1320 if (idetape_rewind_tape(drive)) 1321 return -EIO; 1322 return 0; 1323 case MTLOAD: 1324 ide_tape_discard_merge_buffer(drive, 0); 1325 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1326 case MTUNLOAD: 1327 case MTOFFL: 1328 /* 1329 * If door is locked, attempt to unlock before 1330 * attempting to eject. 1331 */ 1332 if (tape->door_locked) { 1333 if (!ide_set_media_lock(drive, disk, 0)) 1334 tape->door_locked = DOOR_UNLOCKED; 1335 } 1336 ide_tape_discard_merge_buffer(drive, 0); 1337 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1338 if (!retval) 1339 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1340 return retval; 1341 case MTNOP: 1342 ide_tape_discard_merge_buffer(drive, 0); 1343 return idetape_flush_tape_buffers(drive); 1344 case MTRETEN: 1345 ide_tape_discard_merge_buffer(drive, 0); 1346 return ide_do_start_stop(drive, disk, 1347 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1348 case MTEOM: 1349 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1350 return ide_queue_pc_tail(drive, disk, &pc); 1351 case MTERASE: 1352 (void)idetape_rewind_tape(drive); 1353 idetape_create_erase_cmd(&pc); 1354 return ide_queue_pc_tail(drive, disk, &pc); 1355 case MTSETBLK: 1356 if (mt_count) { 1357 if (mt_count < tape->blk_size || 1358 mt_count % tape->blk_size) 1359 return -EIO; 1360 tape->user_bs_factor = mt_count / tape->blk_size; 1361 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1362 } else 1363 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1364 return 0; 1365 case MTSEEK: 1366 ide_tape_discard_merge_buffer(drive, 0); 1367 return idetape_position_tape(drive, 1368 mt_count * tape->user_bs_factor, tape->partition, 0); 1369 case MTSETPART: 1370 ide_tape_discard_merge_buffer(drive, 0); 1371 return idetape_position_tape(drive, 0, mt_count, 0); 1372 case MTFSR: 1373 case MTBSR: 1374 case MTLOCK: 1375 retval = ide_set_media_lock(drive, disk, 1); 1376 if (retval) 1377 return retval; 1378 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1379 return 0; 1380 case MTUNLOCK: 1381 retval = ide_set_media_lock(drive, disk, 0); 1382 if (retval) 1383 return retval; 1384 tape->door_locked = DOOR_UNLOCKED; 1385 return 0; 1386 default: 1387 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1388 mt_op); 1389 return -EIO; 1390 } 1391} 1392 1393/* 1394 * Our character device ioctls. General mtio.h magnetic io commands are 1395 * supported here, and not in the corresponding block interface. Our own 1396 * ide-tape ioctls are supported on both interfaces. 1397 */ 1398static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1399 unsigned int cmd, unsigned long arg) 1400{ 1401 struct ide_tape_obj *tape = file->private_data; 1402 ide_drive_t *drive = tape->drive; 1403 struct mtop mtop; 1404 struct mtget mtget; 1405 struct mtpos mtpos; 1406 int block_offset = 0, position = tape->first_frame; 1407 void __user *argp = (void __user *)arg; 1408 1409 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1410 1411 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1412 ide_tape_flush_merge_buffer(drive); 1413 idetape_flush_tape_buffers(drive); 1414 } 1415 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1416 block_offset = tape->valid / 1417 (tape->blk_size * tape->user_bs_factor); 1418 position = idetape_read_position(drive); 1419 if (position < 0) 1420 return -EIO; 1421 } 1422 switch (cmd) { 1423 case MTIOCTOP: 1424 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1425 return -EFAULT; 1426 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1427 case MTIOCGET: 1428 memset(&mtget, 0, sizeof(struct mtget)); 1429 mtget.mt_type = MT_ISSCSI2; 1430 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1431 mtget.mt_dsreg = 1432 ((tape->blk_size * tape->user_bs_factor) 1433 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1434 1435 if (tape->drv_write_prot) 1436 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1437 1438 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1439 return -EFAULT; 1440 return 0; 1441 case MTIOCPOS: 1442 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1443 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1444 return -EFAULT; 1445 return 0; 1446 default: 1447 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1448 ide_tape_discard_merge_buffer(drive, 1); 1449 return idetape_blkdev_ioctl(drive, cmd, arg); 1450 } 1451} 1452 1453/* 1454 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1455 * block size with the reported value. 1456 */ 1457static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1458{ 1459 idetape_tape_t *tape = drive->driver_data; 1460 struct ide_atapi_pc pc; 1461 1462 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1463 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1464 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1465 if (tape->blk_size == 0) { 1466 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1467 "block size, assuming 32k\n"); 1468 tape->blk_size = 32768; 1469 } 1470 return; 1471 } 1472 tape->blk_size = (pc.buf[4 + 5] << 16) + 1473 (pc.buf[4 + 6] << 8) + 1474 pc.buf[4 + 7]; 1475 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 1476} 1477 1478static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1479{ 1480 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1481 ide_drive_t *drive; 1482 idetape_tape_t *tape; 1483 int retval; 1484 1485 if (i >= MAX_HWIFS * MAX_DRIVES) 1486 return -ENXIO; 1487 1488 lock_kernel(); 1489 tape = ide_tape_chrdev_get(i); 1490 if (!tape) { 1491 unlock_kernel(); 1492 return -ENXIO; 1493 } 1494 1495 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1496 1497 /* 1498 * We really want to do nonseekable_open(inode, filp); here, but some 1499 * versions of tar incorrectly call lseek on tapes and bail out if that 1500 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1501 */ 1502 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1503 1504 drive = tape->drive; 1505 1506 filp->private_data = tape; 1507 1508 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1509 retval = -EBUSY; 1510 goto out_put_tape; 1511 } 1512 1513 retval = idetape_wait_ready(drive, 60 * HZ); 1514 if (retval) { 1515 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1516 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1517 goto out_put_tape; 1518 } 1519 1520 idetape_read_position(drive); 1521 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1522 (void)idetape_rewind_tape(drive); 1523 1524 /* Read block size and write protect status from drive. */ 1525 ide_tape_get_bsize_from_bdesc(drive); 1526 1527 /* Set write protect flag if device is opened as read-only. */ 1528 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1529 tape->write_prot = 1; 1530 else 1531 tape->write_prot = tape->drv_write_prot; 1532 1533 /* Make sure drive isn't write protected if user wants to write. */ 1534 if (tape->write_prot) { 1535 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1536 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1537 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1538 retval = -EROFS; 1539 goto out_put_tape; 1540 } 1541 } 1542 1543 /* Lock the tape drive door so user can't eject. */ 1544 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1545 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1546 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1547 tape->door_locked = DOOR_LOCKED; 1548 } 1549 } 1550 unlock_kernel(); 1551 return 0; 1552 1553out_put_tape: 1554 ide_tape_put(tape); 1555 unlock_kernel(); 1556 return retval; 1557} 1558 1559static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1560{ 1561 idetape_tape_t *tape = drive->driver_data; 1562 1563 ide_tape_flush_merge_buffer(drive); 1564 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1565 if (tape->buf != NULL) { 1566 idetape_pad_zeros(drive, tape->blk_size * 1567 (tape->user_bs_factor - 1)); 1568 kfree(tape->buf); 1569 tape->buf = NULL; 1570 } 1571 idetape_write_filemark(drive); 1572 idetape_flush_tape_buffers(drive); 1573 idetape_flush_tape_buffers(drive); 1574} 1575 1576static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1577{ 1578 struct ide_tape_obj *tape = filp->private_data; 1579 ide_drive_t *drive = tape->drive; 1580 unsigned int minor = iminor(inode); 1581 1582 lock_kernel(); 1583 tape = drive->driver_data; 1584 1585 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1586 1587 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1588 idetape_write_release(drive, minor); 1589 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1590 if (minor < 128) 1591 ide_tape_discard_merge_buffer(drive, 1); 1592 } 1593 1594 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1595 (void) idetape_rewind_tape(drive); 1596 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1597 if (tape->door_locked == DOOR_LOCKED) { 1598 if (!ide_set_media_lock(drive, tape->disk, 0)) 1599 tape->door_locked = DOOR_UNLOCKED; 1600 } 1601 } 1602 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1603 ide_tape_put(tape); 1604 unlock_kernel(); 1605 return 0; 1606} 1607 1608static void idetape_get_inquiry_results(ide_drive_t *drive) 1609{ 1610 idetape_tape_t *tape = drive->driver_data; 1611 struct ide_atapi_pc pc; 1612 u8 pc_buf[256]; 1613 char fw_rev[4], vendor_id[8], product_id[16]; 1614 1615 idetape_create_inquiry_cmd(&pc); 1616 pc.buf = &pc_buf[0]; 1617 pc.buf_size = sizeof(pc_buf); 1618 1619 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1620 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1621 tape->name); 1622 return; 1623 } 1624 memcpy(vendor_id, &pc.buf[8], 8); 1625 memcpy(product_id, &pc.buf[16], 16); 1626 memcpy(fw_rev, &pc.buf[32], 4); 1627 1628 ide_fixstring(vendor_id, 8, 0); 1629 ide_fixstring(product_id, 16, 0); 1630 ide_fixstring(fw_rev, 4, 0); 1631 1632 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1633 drive->name, tape->name, vendor_id, product_id, fw_rev); 1634} 1635 1636/* 1637 * Ask the tape about its various parameters. In particular, we will adjust our 1638 * data transfer buffer size to the recommended value as returned by the tape. 1639 */ 1640static void idetape_get_mode_sense_results(ide_drive_t *drive) 1641{ 1642 idetape_tape_t *tape = drive->driver_data; 1643 struct ide_atapi_pc pc; 1644 u8 *caps; 1645 u8 speed, max_speed; 1646 1647 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1648 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1649 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1650 " some default values\n"); 1651 tape->blk_size = 512; 1652 put_unaligned(52, (u16 *)&tape->caps[12]); 1653 put_unaligned(540, (u16 *)&tape->caps[14]); 1654 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1655 return; 1656 } 1657 caps = pc.buf + 4 + pc.buf[3]; 1658 1659 /* convert to host order and save for later use */ 1660 speed = be16_to_cpup((__be16 *)&caps[14]); 1661 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1662 1663 *(u16 *)&caps[8] = max_speed; 1664 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1665 *(u16 *)&caps[14] = speed; 1666 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1667 1668 if (!speed) { 1669 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1670 "(assuming 650KB/sec)\n", drive->name); 1671 *(u16 *)&caps[14] = 650; 1672 } 1673 if (!max_speed) { 1674 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1675 "(assuming 650KB/sec)\n", drive->name); 1676 *(u16 *)&caps[8] = 650; 1677 } 1678 1679 memcpy(&tape->caps, caps, 20); 1680 1681 /* device lacks locking support according to capabilities page */ 1682 if ((caps[6] & 1) == 0) 1683 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1684 1685 if (caps[7] & 0x02) 1686 tape->blk_size = 512; 1687 else if (caps[7] & 0x04) 1688 tape->blk_size = 1024; 1689} 1690 1691#ifdef CONFIG_IDE_PROC_FS 1692#define ide_tape_devset_get(name, field) \ 1693static int get_##name(ide_drive_t *drive) \ 1694{ \ 1695 idetape_tape_t *tape = drive->driver_data; \ 1696 return tape->field; \ 1697} 1698 1699#define ide_tape_devset_set(name, field) \ 1700static int set_##name(ide_drive_t *drive, int arg) \ 1701{ \ 1702 idetape_tape_t *tape = drive->driver_data; \ 1703 tape->field = arg; \ 1704 return 0; \ 1705} 1706 1707#define ide_tape_devset_rw_field(_name, _field) \ 1708ide_tape_devset_get(_name, _field) \ 1709ide_tape_devset_set(_name, _field) \ 1710IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1711 1712#define ide_tape_devset_r_field(_name, _field) \ 1713ide_tape_devset_get(_name, _field) \ 1714IDE_DEVSET(_name, 0, get_##_name, NULL) 1715 1716static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1717static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1718static int divf_buffer(ide_drive_t *drive) { return 2; } 1719static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1720 1721ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1722 1723ide_tape_devset_rw_field(debug_mask, debug_mask); 1724ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1725 1726ide_tape_devset_r_field(avg_speed, avg_speed); 1727ide_tape_devset_r_field(speed, caps[14]); 1728ide_tape_devset_r_field(buffer, caps[16]); 1729ide_tape_devset_r_field(buffer_size, buffer_size); 1730 1731static const struct ide_proc_devset idetape_settings[] = { 1732 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1733 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1734 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1735 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1736 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1737 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1738 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1739 mulf_tdsc, divf_tdsc), 1740 { NULL }, 1741}; 1742#endif 1743 1744/* 1745 * The function below is called to: 1746 * 1747 * 1. Initialize our various state variables. 1748 * 2. Ask the tape for its capabilities. 1749 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1750 * is chosen based on the recommendation which we received in step 2. 1751 * 1752 * Note that at this point ide.c already assigned us an irq, so that we can 1753 * queue requests here and wait for their completion. 1754 */ 1755static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1756{ 1757 unsigned long t; 1758 int speed; 1759 int buffer_size; 1760 u16 *ctl = (u16 *)&tape->caps[12]; 1761 1762 drive->pc_callback = ide_tape_callback; 1763 1764 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1765 1766 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1767 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1768 tape->name); 1769 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1770 } 1771 1772 /* Seagate Travan drives do not support DSC overlap. */ 1773 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1774 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1775 1776 tape->minor = minor; 1777 tape->name[0] = 'h'; 1778 tape->name[1] = 't'; 1779 tape->name[2] = '0' + minor; 1780 tape->chrdev_dir = IDETAPE_DIR_NONE; 1781 1782 idetape_get_inquiry_results(drive); 1783 idetape_get_mode_sense_results(drive); 1784 ide_tape_get_bsize_from_bdesc(drive); 1785 tape->user_bs_factor = 1; 1786 tape->buffer_size = *ctl * tape->blk_size; 1787 while (tape->buffer_size > 0xffff) { 1788 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1789 *ctl /= 2; 1790 tape->buffer_size = *ctl * tape->blk_size; 1791 } 1792 buffer_size = tape->buffer_size; 1793 1794 /* select the "best" DSC read/write polling freq */ 1795 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1796 1797 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1798 1799 /* 1800 * Ensure that the number we got makes sense; limit it within 1801 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1802 */ 1803 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1804 IDETAPE_DSC_RW_MAX); 1805 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1806 "%lums tDSC%s\n", 1807 drive->name, tape->name, *(u16 *)&tape->caps[14], 1808 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1809 tape->buffer_size / 1024, 1810 tape->best_dsc_rw_freq * 1000 / HZ, 1811 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1812 1813 ide_proc_register_driver(drive, tape->driver); 1814} 1815 1816static void ide_tape_remove(ide_drive_t *drive) 1817{ 1818 idetape_tape_t *tape = drive->driver_data; 1819 1820 ide_proc_unregister_driver(drive, tape->driver); 1821 device_del(&tape->dev); 1822 ide_unregister_region(tape->disk); 1823 1824 mutex_lock(&idetape_ref_mutex); 1825 put_device(&tape->dev); 1826 mutex_unlock(&idetape_ref_mutex); 1827} 1828 1829static void ide_tape_release(struct device *dev) 1830{ 1831 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1832 ide_drive_t *drive = tape->drive; 1833 struct gendisk *g = tape->disk; 1834 1835 BUG_ON(tape->valid); 1836 1837 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1838 drive->driver_data = NULL; 1839 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1840 device_destroy(idetape_sysfs_class, 1841 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1842 idetape_devs[tape->minor] = NULL; 1843 g->private_data = NULL; 1844 put_disk(g); 1845 kfree(tape); 1846} 1847 1848#ifdef CONFIG_IDE_PROC_FS 1849static int proc_idetape_read_name 1850 (char *page, char **start, off_t off, int count, int *eof, void *data) 1851{ 1852 ide_drive_t *drive = (ide_drive_t *) data; 1853 idetape_tape_t *tape = drive->driver_data; 1854 char *out = page; 1855 int len; 1856 1857 len = sprintf(out, "%s\n", tape->name); 1858 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1859} 1860 1861static ide_proc_entry_t idetape_proc[] = { 1862 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1863 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1864 { NULL, 0, NULL, NULL } 1865}; 1866 1867static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1868{ 1869 return idetape_proc; 1870} 1871 1872static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1873{ 1874 return idetape_settings; 1875} 1876#endif 1877 1878static int ide_tape_probe(ide_drive_t *); 1879 1880static struct ide_driver idetape_driver = { 1881 .gen_driver = { 1882 .owner = THIS_MODULE, 1883 .name = "ide-tape", 1884 .bus = &ide_bus_type, 1885 }, 1886 .probe = ide_tape_probe, 1887 .remove = ide_tape_remove, 1888 .version = IDETAPE_VERSION, 1889 .do_request = idetape_do_request, 1890#ifdef CONFIG_IDE_PROC_FS 1891 .proc_entries = ide_tape_proc_entries, 1892 .proc_devsets = ide_tape_proc_devsets, 1893#endif 1894}; 1895 1896/* Our character device supporting functions, passed to register_chrdev. */ 1897static const struct file_operations idetape_fops = { 1898 .owner = THIS_MODULE, 1899 .read = idetape_chrdev_read, 1900 .write = idetape_chrdev_write, 1901 .ioctl = idetape_chrdev_ioctl, 1902 .open = idetape_chrdev_open, 1903 .release = idetape_chrdev_release, 1904}; 1905 1906static int idetape_open(struct block_device *bdev, fmode_t mode) 1907{ 1908 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1909 1910 if (!tape) 1911 return -ENXIO; 1912 1913 return 0; 1914} 1915 1916static int idetape_release(struct gendisk *disk, fmode_t mode) 1917{ 1918 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1919 1920 ide_tape_put(tape); 1921 return 0; 1922} 1923 1924static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1925 unsigned int cmd, unsigned long arg) 1926{ 1927 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1928 ide_drive_t *drive = tape->drive; 1929 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1930 if (err == -EINVAL) 1931 err = idetape_blkdev_ioctl(drive, cmd, arg); 1932 return err; 1933} 1934 1935static struct block_device_operations idetape_block_ops = { 1936 .owner = THIS_MODULE, 1937 .open = idetape_open, 1938 .release = idetape_release, 1939 .locked_ioctl = idetape_ioctl, 1940}; 1941 1942static int ide_tape_probe(ide_drive_t *drive) 1943{ 1944 idetape_tape_t *tape; 1945 struct gendisk *g; 1946 int minor; 1947 1948 if (!strstr("ide-tape", drive->driver_req)) 1949 goto failed; 1950 1951 if (drive->media != ide_tape) 1952 goto failed; 1953 1954 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 1955 ide_check_atapi_device(drive, DRV_NAME) == 0) { 1956 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 1957 " the driver\n", drive->name); 1958 goto failed; 1959 } 1960 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 1961 if (tape == NULL) { 1962 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 1963 drive->name); 1964 goto failed; 1965 } 1966 1967 g = alloc_disk(1 << PARTN_BITS); 1968 if (!g) 1969 goto out_free_tape; 1970 1971 ide_init_disk(g, drive); 1972 1973 tape->dev.parent = &drive->gendev; 1974 tape->dev.release = ide_tape_release; 1975 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 1976 1977 if (device_register(&tape->dev)) 1978 goto out_free_disk; 1979 1980 tape->drive = drive; 1981 tape->driver = &idetape_driver; 1982 tape->disk = g; 1983 1984 g->private_data = &tape->driver; 1985 1986 drive->driver_data = tape; 1987 1988 mutex_lock(&idetape_ref_mutex); 1989 for (minor = 0; idetape_devs[minor]; minor++) 1990 ; 1991 idetape_devs[minor] = tape; 1992 mutex_unlock(&idetape_ref_mutex); 1993 1994 idetape_setup(drive, tape, minor); 1995 1996 device_create(idetape_sysfs_class, &drive->gendev, 1997 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 1998 device_create(idetape_sysfs_class, &drive->gendev, 1999 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2000 "n%s", tape->name); 2001 2002 g->fops = &idetape_block_ops; 2003 ide_register_region(g); 2004 2005 return 0; 2006 2007out_free_disk: 2008 put_disk(g); 2009out_free_tape: 2010 kfree(tape); 2011failed: 2012 return -ENODEV; 2013} 2014 2015static void __exit idetape_exit(void) 2016{ 2017 driver_unregister(&idetape_driver.gen_driver); 2018 class_destroy(idetape_sysfs_class); 2019 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2020} 2021 2022static int __init idetape_init(void) 2023{ 2024 int error = 1; 2025 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2026 if (IS_ERR(idetape_sysfs_class)) { 2027 idetape_sysfs_class = NULL; 2028 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2029 error = -EBUSY; 2030 goto out; 2031 } 2032 2033 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2034 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2035 " interface\n"); 2036 error = -EBUSY; 2037 goto out_free_class; 2038 } 2039 2040 error = driver_register(&idetape_driver.gen_driver); 2041 if (error) 2042 goto out_free_driver; 2043 2044 return 0; 2045 2046out_free_driver: 2047 driver_unregister(&idetape_driver.gen_driver); 2048out_free_class: 2049 class_destroy(idetape_sysfs_class); 2050out: 2051 return error; 2052} 2053 2054MODULE_ALIAS("ide:*m-tape*"); 2055module_init(idetape_init); 2056module_exit(idetape_exit); 2057MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2058MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2059MODULE_LICENSE("GPL"); 2060