ide-tape.c revision e972d7027c0fb7055f5f2fe02d662c9528063bef
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 50/* define to see debug info */ 51#undef IDETAPE_DEBUG_LOG 52 53#ifdef IDETAPE_DEBUG_LOG 54#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args) 55#else 56#define ide_debug_log(lvl, fmt, args...) do {} while (0) 57#endif 58 59/**************************** Tunable parameters *****************************/ 60/* 61 * After each failed packet command we issue a request sense command and retry 62 * the packet command IDETAPE_MAX_PC_RETRIES times. 63 * 64 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 65 */ 66#define IDETAPE_MAX_PC_RETRIES 3 67 68/* 69 * The following parameter is used to select the point in the internal tape fifo 70 * in which we will start to refill the buffer. Decreasing the following 71 * parameter will improve the system's latency and interactive response, while 72 * using a high value might improve system throughput. 73 */ 74#define IDETAPE_FIFO_THRESHOLD 2 75 76/* 77 * DSC polling parameters. 78 * 79 * Polling for DSC (a single bit in the status register) is a very important 80 * function in ide-tape. There are two cases in which we poll for DSC: 81 * 82 * 1. Before a read/write packet command, to ensure that we can transfer data 83 * from/to the tape's data buffers, without causing an actual media access. 84 * In case the tape is not ready yet, we take out our request from the device 85 * request queue, so that ide.c could service requests from the other device 86 * on the same interface in the meantime. 87 * 88 * 2. After the successful initialization of a "media access packet command", 89 * which is a command that can take a long time to complete (the interval can 90 * range from several seconds to even an hour). Again, we postpone our request 91 * in the middle to free the bus for the other device. The polling frequency 92 * here should be lower than the read/write frequency since those media access 93 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 94 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 95 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 96 * 97 * We also set a timeout for the timer, in case something goes wrong. The 98 * timeout should be longer then the maximum execution time of a tape operation. 99 */ 100 101/* DSC timings. */ 102#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 103#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 104#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 105#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 106#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 107#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 108#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 109 110/*************************** End of tunable parameters ***********************/ 111 112/* tape directions */ 113enum { 114 IDETAPE_DIR_NONE = (1 << 0), 115 IDETAPE_DIR_READ = (1 << 1), 116 IDETAPE_DIR_WRITE = (1 << 2), 117}; 118 119/* Tape door status */ 120#define DOOR_UNLOCKED 0 121#define DOOR_LOCKED 1 122#define DOOR_EXPLICITLY_LOCKED 2 123 124/* Some defines for the SPACE command */ 125#define IDETAPE_SPACE_OVER_FILEMARK 1 126#define IDETAPE_SPACE_TO_EOD 3 127 128/* Some defines for the LOAD UNLOAD command */ 129#define IDETAPE_LU_LOAD_MASK 1 130#define IDETAPE_LU_RETENSION_MASK 2 131#define IDETAPE_LU_EOT_MASK 4 132 133/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 134#define IDETAPE_BLOCK_DESCRIPTOR 0 135#define IDETAPE_CAPABILITIES_PAGE 0x2a 136 137/* 138 * Most of our global data which we need to save even as we leave the driver due 139 * to an interrupt or a timer event is stored in the struct defined below. 140 */ 141typedef struct ide_tape_obj { 142 ide_drive_t *drive; 143 struct ide_driver *driver; 144 struct gendisk *disk; 145 struct device dev; 146 147 /* used by REQ_IDETAPE_{READ,WRITE} requests */ 148 struct ide_atapi_pc queued_pc; 149 150 /* 151 * DSC polling variables. 152 * 153 * While polling for DSC we use postponed_rq to postpone the current 154 * request so that ide.c will be able to service pending requests on the 155 * other device. Note that at most we will have only one DSC (usually 156 * data transfer) request in the device request queue. 157 */ 158 struct request *postponed_rq; 159 /* The time in which we started polling for DSC */ 160 unsigned long dsc_polling_start; 161 /* Timer used to poll for dsc */ 162 struct timer_list dsc_timer; 163 /* Read/Write dsc polling frequency */ 164 unsigned long best_dsc_rw_freq; 165 unsigned long dsc_poll_freq; 166 unsigned long dsc_timeout; 167 168 /* Read position information */ 169 u8 partition; 170 /* Current block */ 171 unsigned int first_frame; 172 173 /* Last error information */ 174 u8 sense_key, asc, ascq; 175 176 /* Character device operation */ 177 unsigned int minor; 178 /* device name */ 179 char name[4]; 180 /* Current character device data transfer direction */ 181 u8 chrdev_dir; 182 183 /* tape block size, usually 512 or 1024 bytes */ 184 unsigned short blk_size; 185 int user_bs_factor; 186 187 /* Copy of the tape's Capabilities and Mechanical Page */ 188 u8 caps[20]; 189 190 /* 191 * Active data transfer request parameters. 192 * 193 * At most, there is only one ide-tape originated data transfer request 194 * in the device request queue. This allows ide.c to easily service 195 * requests from the other device when we postpone our active request. 196 */ 197 198 /* Data buffer size chosen based on the tape's recommendation */ 199 int buffer_size; 200 /* Staging buffer of buffer_size bytes */ 201 void *buf; 202 /* The read/write cursor */ 203 void *cur; 204 /* The number of valid bytes in buf */ 205 size_t valid; 206 207 /* Measures average tape speed */ 208 unsigned long avg_time; 209 int avg_size; 210 int avg_speed; 211 212 /* the door is currently locked */ 213 int door_locked; 214 /* the tape hardware is write protected */ 215 char drv_write_prot; 216 /* the tape is write protected (hardware or opened as read-only) */ 217 char write_prot; 218} idetape_tape_t; 219 220static DEFINE_MUTEX(idetape_ref_mutex); 221 222static struct class *idetape_sysfs_class; 223 224static void ide_tape_release(struct device *); 225 226static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 227 228static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, 229 unsigned int i) 230{ 231 struct ide_tape_obj *tape = NULL; 232 233 mutex_lock(&idetape_ref_mutex); 234 235 if (cdev) 236 tape = idetape_devs[i]; 237 else 238 tape = ide_drv_g(disk, ide_tape_obj); 239 240 if (tape) { 241 if (ide_device_get(tape->drive)) 242 tape = NULL; 243 else 244 get_device(&tape->dev); 245 } 246 247 mutex_unlock(&idetape_ref_mutex); 248 return tape; 249} 250 251static void ide_tape_put(struct ide_tape_obj *tape) 252{ 253 ide_drive_t *drive = tape->drive; 254 255 mutex_lock(&idetape_ref_mutex); 256 put_device(&tape->dev); 257 ide_device_put(drive); 258 mutex_unlock(&idetape_ref_mutex); 259} 260 261/* 262 * called on each failed packet command retry to analyze the request sense. We 263 * currently do not utilize this information. 264 */ 265static void idetape_analyze_error(ide_drive_t *drive) 266{ 267 idetape_tape_t *tape = drive->driver_data; 268 struct ide_atapi_pc *pc = drive->failed_pc; 269 struct request *rq = drive->hwif->rq; 270 u8 *sense = bio_data(rq->bio); 271 272 tape->sense_key = sense[2] & 0xF; 273 tape->asc = sense[12]; 274 tape->ascq = sense[13]; 275 276 ide_debug_log(IDE_DBG_FUNC, 277 "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x", 278 rq->cmd[0], tape->sense_key, tape->asc, tape->ascq); 279 280 /* correct remaining bytes to transfer */ 281 if (pc->flags & PC_FLAG_DMA_ERROR) 282 rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); 283 284 /* 285 * If error was the result of a zero-length read or write command, 286 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 287 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 288 */ 289 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 290 /* length == 0 */ 291 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 292 if (tape->sense_key == 5) { 293 /* don't report an error, everything's ok */ 294 pc->error = 0; 295 /* don't retry read/write */ 296 pc->flags |= PC_FLAG_ABORT; 297 } 298 } 299 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 300 pc->error = IDE_DRV_ERROR_FILEMARK; 301 pc->flags |= PC_FLAG_ABORT; 302 } 303 if (pc->c[0] == WRITE_6) { 304 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 305 && tape->asc == 0x0 && tape->ascq == 0x2)) { 306 pc->error = IDE_DRV_ERROR_EOD; 307 pc->flags |= PC_FLAG_ABORT; 308 } 309 } 310 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 311 if (tape->sense_key == 8) { 312 pc->error = IDE_DRV_ERROR_EOD; 313 pc->flags |= PC_FLAG_ABORT; 314 } 315 if (!(pc->flags & PC_FLAG_ABORT) && 316 (blk_rq_bytes(rq) - rq->resid_len)) 317 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 318 } 319} 320 321static void ide_tape_handle_dsc(ide_drive_t *); 322 323static int ide_tape_callback(ide_drive_t *drive, int dsc) 324{ 325 idetape_tape_t *tape = drive->driver_data; 326 struct ide_atapi_pc *pc = drive->pc; 327 struct request *rq = drive->hwif->rq; 328 int uptodate = pc->error ? 0 : 1; 329 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; 330 331 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0], 332 dsc, err); 333 334 if (dsc) 335 ide_tape_handle_dsc(drive); 336 337 if (drive->failed_pc == pc) 338 drive->failed_pc = NULL; 339 340 if (pc->c[0] == REQUEST_SENSE) { 341 if (uptodate) 342 idetape_analyze_error(drive); 343 else 344 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 345 "itself - Aborting request!\n"); 346 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 347 unsigned int blocks = 348 (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; 349 350 tape->avg_size += blocks * tape->blk_size; 351 352 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 353 tape->avg_speed = tape->avg_size * HZ / 354 (jiffies - tape->avg_time) / 1024; 355 tape->avg_size = 0; 356 tape->avg_time = jiffies; 357 } 358 359 tape->first_frame += blocks; 360 361 if (pc->error) { 362 uptodate = 0; 363 err = pc->error; 364 } 365 } 366 rq->errors = err; 367 368 return uptodate; 369} 370 371/* 372 * Postpone the current request so that ide.c will be able to service requests 373 * from another device on the same port while we are polling for DSC. 374 */ 375static void idetape_postpone_request(ide_drive_t *drive) 376{ 377 idetape_tape_t *tape = drive->driver_data; 378 struct request *rq = drive->hwif->rq; 379 380 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu", 381 rq->cmd[0], tape->dsc_poll_freq); 382 383 tape->postponed_rq = rq; 384 385 ide_stall_queue(drive, tape->dsc_poll_freq); 386} 387 388static void ide_tape_handle_dsc(ide_drive_t *drive) 389{ 390 idetape_tape_t *tape = drive->driver_data; 391 392 /* Media access command */ 393 tape->dsc_polling_start = jiffies; 394 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 395 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 396 /* Allow ide.c to handle other requests */ 397 idetape_postpone_request(drive); 398} 399 400/* 401 * Packet Command Interface 402 * 403 * The current Packet Command is available in drive->pc, and will not change 404 * until we finish handling it. Each packet command is associated with a 405 * callback function that will be called when the command is finished. 406 * 407 * The handling will be done in three stages: 408 * 409 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set 410 * the interrupt handler to ide_pc_intr. 411 * 412 * 2. On each interrupt, ide_pc_intr will be called. This step will be 413 * repeated until the device signals us that no more interrupts will be issued. 414 * 415 * 3. ATAPI Tape media access commands have immediate status with a delayed 416 * process. In case of a successful initiation of a media access packet command, 417 * the DSC bit will be set when the actual execution of the command is finished. 418 * Since the tape drive will not issue an interrupt, we have to poll for this 419 * event. In this case, we define the request as "low priority request" by 420 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 421 * exit the driver. 422 * 423 * ide.c will then give higher priority to requests which originate from the 424 * other device, until will change rq_status to RQ_ACTIVE. 425 * 426 * 4. When the packet command is finished, it will be checked for errors. 427 * 428 * 5. In case an error was found, we queue a request sense packet command in 429 * front of the request queue and retry the operation up to 430 * IDETAPE_MAX_PC_RETRIES times. 431 * 432 * 6. In case no error was found, or we decided to give up and not to retry 433 * again, the callback function will be called and then we will handle the next 434 * request. 435 */ 436 437static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, 438 struct ide_cmd *cmd, 439 struct ide_atapi_pc *pc) 440{ 441 idetape_tape_t *tape = drive->driver_data; 442 struct request *rq = drive->hwif->rq; 443 444 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 445 drive->failed_pc = pc; 446 447 /* Set the current packet command */ 448 drive->pc = pc; 449 450 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 451 (pc->flags & PC_FLAG_ABORT)) { 452 453 /* 454 * We will "abort" retrying a packet command in case legitimate 455 * error code was received (crossing a filemark, or end of the 456 * media, for example). 457 */ 458 if (!(pc->flags & PC_FLAG_ABORT)) { 459 if (!(pc->c[0] == TEST_UNIT_READY && 460 tape->sense_key == 2 && tape->asc == 4 && 461 (tape->ascq == 1 || tape->ascq == 8))) { 462 printk(KERN_ERR "ide-tape: %s: I/O error, " 463 "pc = %2x, key = %2x, " 464 "asc = %2x, ascq = %2x\n", 465 tape->name, pc->c[0], 466 tape->sense_key, tape->asc, 467 tape->ascq); 468 } 469 /* Giving up */ 470 pc->error = IDE_DRV_ERROR_GENERAL; 471 } 472 473 drive->failed_pc = NULL; 474 drive->pc_callback(drive, 0); 475 ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); 476 return ide_stopped; 477 } 478 ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries, 479 pc->c[0]); 480 481 pc->retries++; 482 483 return ide_issue_pc(drive, cmd); 484} 485 486/* A mode sense command is used to "sense" tape parameters. */ 487static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 488{ 489 ide_init_pc(pc); 490 pc->c[0] = MODE_SENSE; 491 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 492 /* DBD = 1 - Don't return block descriptors */ 493 pc->c[1] = 8; 494 pc->c[2] = page_code; 495 /* 496 * Changed pc->c[3] to 0 (255 will at best return unused info). 497 * 498 * For SCSI this byte is defined as subpage instead of high byte 499 * of length and some IDE drives seem to interpret it this way 500 * and return an error when 255 is used. 501 */ 502 pc->c[3] = 0; 503 /* We will just discard data in that case */ 504 pc->c[4] = 255; 505 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 506 pc->req_xfer = 12; 507 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 508 pc->req_xfer = 24; 509 else 510 pc->req_xfer = 50; 511} 512 513static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 514{ 515 ide_hwif_t *hwif = drive->hwif; 516 idetape_tape_t *tape = drive->driver_data; 517 struct ide_atapi_pc *pc = drive->pc; 518 u8 stat; 519 520 stat = hwif->tp_ops->read_status(hwif); 521 522 if (stat & ATA_DSC) { 523 if (stat & ATA_ERR) { 524 /* Error detected */ 525 if (pc->c[0] != TEST_UNIT_READY) 526 printk(KERN_ERR "ide-tape: %s: I/O error, ", 527 tape->name); 528 /* Retry operation */ 529 ide_retry_pc(drive); 530 return ide_stopped; 531 } 532 pc->error = 0; 533 } else { 534 pc->error = IDE_DRV_ERROR_GENERAL; 535 drive->failed_pc = NULL; 536 } 537 drive->pc_callback(drive, 0); 538 return ide_stopped; 539} 540 541static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 542 struct ide_atapi_pc *pc, struct request *rq, 543 u8 opcode) 544{ 545 unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); 546 547 ide_init_pc(pc); 548 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 549 pc->c[1] = 1; 550 551 if (blk_rq_bytes(rq) == tape->buffer_size) 552 pc->flags |= PC_FLAG_DMA_OK; 553 554 if (opcode == READ_6) 555 pc->c[0] = READ_6; 556 else if (opcode == WRITE_6) { 557 pc->c[0] = WRITE_6; 558 pc->flags |= PC_FLAG_WRITING; 559 } 560 561 memcpy(rq->cmd, pc->c, 12); 562} 563 564static ide_startstop_t idetape_do_request(ide_drive_t *drive, 565 struct request *rq, sector_t block) 566{ 567 ide_hwif_t *hwif = drive->hwif; 568 idetape_tape_t *tape = drive->driver_data; 569 struct ide_atapi_pc *pc = NULL; 570 struct request *postponed_rq = tape->postponed_rq; 571 struct ide_cmd cmd; 572 u8 stat; 573 574 ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u", 575 rq->cmd[0], (unsigned long long)blk_rq_pos(rq), 576 blk_rq_sectors(rq)); 577 578 BUG_ON(!(blk_special_request(rq) || blk_sense_request(rq))); 579 580 /* Retry a failed packet command */ 581 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 582 pc = drive->failed_pc; 583 goto out; 584 } 585 586 if (postponed_rq != NULL) 587 if (rq != postponed_rq) { 588 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 589 "Two DSC requests were queued\n"); 590 drive->failed_pc = NULL; 591 rq->errors = 0; 592 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 593 return ide_stopped; 594 } 595 596 tape->postponed_rq = NULL; 597 598 /* 599 * If the tape is still busy, postpone our request and service 600 * the other device meanwhile. 601 */ 602 stat = hwif->tp_ops->read_status(hwif); 603 604 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 605 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 606 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 607 608 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 609 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 610 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 611 } 612 613 if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && 614 !(stat & ATA_DSC)) { 615 if (postponed_rq == NULL) { 616 tape->dsc_polling_start = jiffies; 617 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 618 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 619 } else if (time_after(jiffies, tape->dsc_timeout)) { 620 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 621 tape->name); 622 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 623 idetape_media_access_finished(drive); 624 return ide_stopped; 625 } else { 626 return ide_do_reset(drive); 627 } 628 } else if (time_after(jiffies, 629 tape->dsc_polling_start + 630 IDETAPE_DSC_MA_THRESHOLD)) 631 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 632 idetape_postpone_request(drive); 633 return ide_stopped; 634 } else 635 drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; 636 637 if (rq->cmd[13] & REQ_IDETAPE_READ) { 638 pc = &tape->queued_pc; 639 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 640 goto out; 641 } 642 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 643 pc = &tape->queued_pc; 644 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 645 goto out; 646 } 647 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 648 pc = (struct ide_atapi_pc *)rq->special; 649 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 650 rq->cmd[13] |= REQ_IDETAPE_PC2; 651 goto out; 652 } 653 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 654 idetape_media_access_finished(drive); 655 return ide_stopped; 656 } 657 BUG(); 658 659out: 660 /* prepare sense request for this command */ 661 ide_prep_sense(drive, rq); 662 663 memset(&cmd, 0, sizeof(cmd)); 664 665 if (rq_data_dir(rq)) 666 cmd.tf_flags |= IDE_TFLAG_WRITE; 667 668 cmd.rq = rq; 669 670 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); 671 ide_map_sg(drive, &cmd); 672 673 return ide_tape_issue_pc(drive, &cmd, pc); 674} 675 676/* 677 * Write a filemark if write_filemark=1. Flush the device buffers without 678 * writing a filemark otherwise. 679 */ 680static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 681 struct ide_atapi_pc *pc, int write_filemark) 682{ 683 ide_init_pc(pc); 684 pc->c[0] = WRITE_FILEMARKS; 685 pc->c[4] = write_filemark; 686 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 687} 688 689static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 690{ 691 idetape_tape_t *tape = drive->driver_data; 692 struct gendisk *disk = tape->disk; 693 int load_attempted = 0; 694 695 /* Wait for the tape to become ready */ 696 set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); 697 timeout += jiffies; 698 while (time_before(jiffies, timeout)) { 699 if (ide_do_test_unit_ready(drive, disk) == 0) 700 return 0; 701 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 702 || (tape->asc == 0x3A)) { 703 /* no media */ 704 if (load_attempted) 705 return -ENOMEDIUM; 706 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 707 load_attempted = 1; 708 /* not about to be ready */ 709 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 710 (tape->ascq == 1 || tape->ascq == 8))) 711 return -EIO; 712 msleep(100); 713 } 714 return -EIO; 715} 716 717static int idetape_flush_tape_buffers(ide_drive_t *drive) 718{ 719 struct ide_tape_obj *tape = drive->driver_data; 720 struct ide_atapi_pc pc; 721 int rc; 722 723 idetape_create_write_filemark_cmd(drive, &pc, 0); 724 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); 725 if (rc) 726 return rc; 727 idetape_wait_ready(drive, 60 * 5 * HZ); 728 return 0; 729} 730 731static int ide_tape_read_position(ide_drive_t *drive) 732{ 733 idetape_tape_t *tape = drive->driver_data; 734 struct ide_atapi_pc pc; 735 u8 buf[20]; 736 737 ide_debug_log(IDE_DBG_FUNC, "enter"); 738 739 /* prep cmd */ 740 ide_init_pc(&pc); 741 pc.c[0] = READ_POSITION; 742 pc.req_xfer = 20; 743 744 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) 745 return -1; 746 747 if (!pc.error) { 748 ide_debug_log(IDE_DBG_FUNC, "BOP - %s", 749 (buf[0] & 0x80) ? "Yes" : "No"); 750 ide_debug_log(IDE_DBG_FUNC, "EOP - %s", 751 (buf[0] & 0x40) ? "Yes" : "No"); 752 753 if (buf[0] & 0x4) { 754 printk(KERN_INFO "ide-tape: Block location is unknown" 755 "to the tape\n"); 756 clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), 757 &drive->atapi_flags); 758 return -1; 759 } else { 760 ide_debug_log(IDE_DBG_FUNC, "Block Location: %u", 761 be32_to_cpup((__be32 *)&buf[4])); 762 763 tape->partition = buf[1]; 764 tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); 765 set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), 766 &drive->atapi_flags); 767 } 768 } 769 770 return tape->first_frame; 771} 772 773static void idetape_create_locate_cmd(ide_drive_t *drive, 774 struct ide_atapi_pc *pc, 775 unsigned int block, u8 partition, int skip) 776{ 777 ide_init_pc(pc); 778 pc->c[0] = POSITION_TO_ELEMENT; 779 pc->c[1] = 2; 780 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 781 pc->c[8] = partition; 782 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 783} 784 785static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 786{ 787 idetape_tape_t *tape = drive->driver_data; 788 789 if (tape->chrdev_dir != IDETAPE_DIR_READ) 790 return; 791 792 clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); 793 tape->valid = 0; 794 if (tape->buf != NULL) { 795 kfree(tape->buf); 796 tape->buf = NULL; 797 } 798 799 tape->chrdev_dir = IDETAPE_DIR_NONE; 800} 801 802/* 803 * Position the tape to the requested block using the LOCATE packet command. 804 * A READ POSITION command is then issued to check where we are positioned. Like 805 * all higher level operations, we queue the commands at the tail of the request 806 * queue and wait for their completion. 807 */ 808static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 809 u8 partition, int skip) 810{ 811 idetape_tape_t *tape = drive->driver_data; 812 struct gendisk *disk = tape->disk; 813 int ret; 814 struct ide_atapi_pc pc; 815 816 if (tape->chrdev_dir == IDETAPE_DIR_READ) 817 __ide_tape_discard_merge_buffer(drive); 818 idetape_wait_ready(drive, 60 * 5 * HZ); 819 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 820 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 821 if (ret) 822 return ret; 823 824 ret = ide_tape_read_position(drive); 825 if (ret < 0) 826 return ret; 827 return 0; 828} 829 830static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 831 int restore_position) 832{ 833 idetape_tape_t *tape = drive->driver_data; 834 int seek, position; 835 836 __ide_tape_discard_merge_buffer(drive); 837 if (restore_position) { 838 position = ide_tape_read_position(drive); 839 seek = position > 0 ? position : 0; 840 if (idetape_position_tape(drive, seek, 0, 0)) { 841 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 842 " %s\n", tape->name, __func__); 843 return; 844 } 845 } 846} 847 848/* 849 * Generate a read/write request for the block device interface and wait for it 850 * to be serviced. 851 */ 852static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 853{ 854 idetape_tape_t *tape = drive->driver_data; 855 struct request *rq; 856 int ret; 857 858 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size); 859 860 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 861 BUG_ON(size < 0 || size % tape->blk_size); 862 863 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 864 rq->cmd_type = REQ_TYPE_SPECIAL; 865 rq->cmd[13] = cmd; 866 rq->rq_disk = tape->disk; 867 rq->__sector = tape->first_frame; 868 869 if (size) { 870 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 871 __GFP_WAIT); 872 if (ret) 873 goto out_put; 874 } 875 876 blk_execute_rq(drive->queue, tape->disk, rq, 0); 877 878 /* calculate the number of transferred bytes and update buffer state */ 879 size -= rq->resid_len; 880 tape->cur = tape->buf; 881 if (cmd == REQ_IDETAPE_READ) 882 tape->valid = size; 883 else 884 tape->valid = 0; 885 886 ret = size; 887 if (rq->errors == IDE_DRV_ERROR_GENERAL) 888 ret = -EIO; 889out_put: 890 blk_put_request(rq); 891 return ret; 892} 893 894static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 895{ 896 ide_init_pc(pc); 897 pc->c[0] = INQUIRY; 898 pc->c[4] = 254; 899 pc->req_xfer = 254; 900} 901 902static void idetape_create_rewind_cmd(ide_drive_t *drive, 903 struct ide_atapi_pc *pc) 904{ 905 ide_init_pc(pc); 906 pc->c[0] = REZERO_UNIT; 907 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 908} 909 910static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 911{ 912 ide_init_pc(pc); 913 pc->c[0] = ERASE; 914 pc->c[1] = 1; 915 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 916} 917 918static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 919{ 920 ide_init_pc(pc); 921 pc->c[0] = SPACE; 922 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 923 pc->c[1] = cmd; 924 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 925} 926 927static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 928{ 929 idetape_tape_t *tape = drive->driver_data; 930 931 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 932 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 933 " but we are not writing.\n"); 934 return; 935 } 936 if (tape->buf) { 937 size_t aligned = roundup(tape->valid, tape->blk_size); 938 939 memset(tape->cur, 0, aligned - tape->valid); 940 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); 941 kfree(tape->buf); 942 tape->buf = NULL; 943 } 944 tape->chrdev_dir = IDETAPE_DIR_NONE; 945} 946 947static int idetape_init_rw(ide_drive_t *drive, int dir) 948{ 949 idetape_tape_t *tape = drive->driver_data; 950 int rc; 951 952 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 953 954 if (tape->chrdev_dir == dir) 955 return 0; 956 957 if (tape->chrdev_dir == IDETAPE_DIR_READ) 958 ide_tape_discard_merge_buffer(drive, 1); 959 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 960 ide_tape_flush_merge_buffer(drive); 961 idetape_flush_tape_buffers(drive); 962 } 963 964 if (tape->buf || tape->valid) { 965 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 966 tape->valid = 0; 967 } 968 969 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 970 if (!tape->buf) 971 return -ENOMEM; 972 tape->chrdev_dir = dir; 973 tape->cur = tape->buf; 974 975 /* 976 * Issue a 0 rw command to ensure that DSC handshake is 977 * switched from completion mode to buffer available mode. No 978 * point in issuing this if DSC overlap isn't supported, some 979 * drives (Seagate STT3401A) will return an error. 980 */ 981 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 982 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 983 : REQ_IDETAPE_WRITE; 984 985 rc = idetape_queue_rw_tail(drive, cmd, 0); 986 if (rc < 0) { 987 kfree(tape->buf); 988 tape->buf = NULL; 989 tape->chrdev_dir = IDETAPE_DIR_NONE; 990 return rc; 991 } 992 } 993 994 return 0; 995} 996 997static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 998{ 999 idetape_tape_t *tape = drive->driver_data; 1000 1001 memset(tape->buf, 0, tape->buffer_size); 1002 1003 while (bcount) { 1004 unsigned int count = min(tape->buffer_size, bcount); 1005 1006 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1007 bcount -= count; 1008 } 1009} 1010 1011/* 1012 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1013 * currently support only one partition. 1014 */ 1015static int idetape_rewind_tape(ide_drive_t *drive) 1016{ 1017 struct ide_tape_obj *tape = drive->driver_data; 1018 struct gendisk *disk = tape->disk; 1019 struct ide_atapi_pc pc; 1020 int ret; 1021 1022 ide_debug_log(IDE_DBG_FUNC, "enter"); 1023 1024 idetape_create_rewind_cmd(drive, &pc); 1025 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1026 if (ret) 1027 return ret; 1028 1029 ret = ide_tape_read_position(drive); 1030 if (ret < 0) 1031 return ret; 1032 return 0; 1033} 1034 1035/* mtio.h compatible commands should be issued to the chrdev interface. */ 1036static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1037 unsigned long arg) 1038{ 1039 idetape_tape_t *tape = drive->driver_data; 1040 void __user *argp = (void __user *)arg; 1041 1042 struct idetape_config { 1043 int dsc_rw_frequency; 1044 int dsc_media_access_frequency; 1045 int nr_stages; 1046 } config; 1047 1048 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd); 1049 1050 switch (cmd) { 1051 case 0x0340: 1052 if (copy_from_user(&config, argp, sizeof(config))) 1053 return -EFAULT; 1054 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1055 break; 1056 case 0x0350: 1057 memset(&config, 0, sizeof(config)); 1058 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1059 config.nr_stages = 1; 1060 if (copy_to_user(argp, &config, sizeof(config))) 1061 return -EFAULT; 1062 break; 1063 default: 1064 return -EIO; 1065 } 1066 return 0; 1067} 1068 1069static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1070 int mt_count) 1071{ 1072 idetape_tape_t *tape = drive->driver_data; 1073 struct gendisk *disk = tape->disk; 1074 struct ide_atapi_pc pc; 1075 int retval, count = 0; 1076 int sprev = !!(tape->caps[4] & 0x20); 1077 1078 1079 ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count); 1080 1081 if (mt_count == 0) 1082 return 0; 1083 if (MTBSF == mt_op || MTBSFM == mt_op) { 1084 if (!sprev) 1085 return -EIO; 1086 mt_count = -mt_count; 1087 } 1088 1089 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1090 tape->valid = 0; 1091 if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), 1092 &drive->atapi_flags)) 1093 ++count; 1094 ide_tape_discard_merge_buffer(drive, 0); 1095 } 1096 1097 switch (mt_op) { 1098 case MTFSF: 1099 case MTBSF: 1100 idetape_create_space_cmd(&pc, mt_count - count, 1101 IDETAPE_SPACE_OVER_FILEMARK); 1102 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1103 case MTFSFM: 1104 case MTBSFM: 1105 if (!sprev) 1106 return -EIO; 1107 retval = idetape_space_over_filemarks(drive, MTFSF, 1108 mt_count - count); 1109 if (retval) 1110 return retval; 1111 count = (MTBSFM == mt_op ? 1 : -1); 1112 return idetape_space_over_filemarks(drive, MTFSF, count); 1113 default: 1114 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1115 mt_op); 1116 return -EIO; 1117 } 1118} 1119 1120/* 1121 * Our character device read / write functions. 1122 * 1123 * The tape is optimized to maximize throughput when it is transferring an 1124 * integral number of the "continuous transfer limit", which is a parameter of 1125 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1126 * 1127 * As of version 1.3 of the driver, the character device provides an abstract 1128 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1129 * same backup/restore procedure is supported. The driver will internally 1130 * convert the requests to the recommended transfer unit, so that an unmatch 1131 * between the user's block size to the recommended size will only result in a 1132 * (slightly) increased driver overhead, but will no longer hit performance. 1133 * This is not applicable to Onstream. 1134 */ 1135static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1136 size_t count, loff_t *ppos) 1137{ 1138 struct ide_tape_obj *tape = file->private_data; 1139 ide_drive_t *drive = tape->drive; 1140 size_t done = 0; 1141 ssize_t ret = 0; 1142 int rc; 1143 1144 ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); 1145 1146 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1147 if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) 1148 if (count > tape->blk_size && 1149 (count % tape->blk_size) == 0) 1150 tape->user_bs_factor = count / tape->blk_size; 1151 } 1152 1153 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1154 if (rc < 0) 1155 return rc; 1156 1157 while (done < count) { 1158 size_t todo; 1159 1160 /* refill if staging buffer is empty */ 1161 if (!tape->valid) { 1162 /* If we are at a filemark, nothing more to read */ 1163 if (test_bit(ilog2(IDE_AFLAG_FILEMARK), 1164 &drive->atapi_flags)) 1165 break; 1166 /* read */ 1167 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1168 tape->buffer_size) <= 0) 1169 break; 1170 } 1171 1172 /* copy out */ 1173 todo = min_t(size_t, count - done, tape->valid); 1174 if (copy_to_user(buf + done, tape->cur, todo)) 1175 ret = -EFAULT; 1176 1177 tape->cur += todo; 1178 tape->valid -= todo; 1179 done += todo; 1180 } 1181 1182 if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { 1183 idetape_space_over_filemarks(drive, MTFSF, 1); 1184 return 0; 1185 } 1186 1187 return ret ? ret : done; 1188} 1189 1190static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1191 size_t count, loff_t *ppos) 1192{ 1193 struct ide_tape_obj *tape = file->private_data; 1194 ide_drive_t *drive = tape->drive; 1195 size_t done = 0; 1196 ssize_t ret = 0; 1197 int rc; 1198 1199 /* The drive is write protected. */ 1200 if (tape->write_prot) 1201 return -EACCES; 1202 1203 ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); 1204 1205 /* Initialize write operation */ 1206 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1207 if (rc < 0) 1208 return rc; 1209 1210 while (done < count) { 1211 size_t todo; 1212 1213 /* flush if staging buffer is full */ 1214 if (tape->valid == tape->buffer_size && 1215 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1216 tape->buffer_size) <= 0) 1217 return rc; 1218 1219 /* copy in */ 1220 todo = min_t(size_t, count - done, 1221 tape->buffer_size - tape->valid); 1222 if (copy_from_user(tape->cur, buf + done, todo)) 1223 ret = -EFAULT; 1224 1225 tape->cur += todo; 1226 tape->valid += todo; 1227 done += todo; 1228 } 1229 1230 return ret ? ret : done; 1231} 1232 1233static int idetape_write_filemark(ide_drive_t *drive) 1234{ 1235 struct ide_tape_obj *tape = drive->driver_data; 1236 struct ide_atapi_pc pc; 1237 1238 /* Write a filemark */ 1239 idetape_create_write_filemark_cmd(drive, &pc, 1); 1240 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { 1241 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1242 return -EIO; 1243 } 1244 return 0; 1245} 1246 1247/* 1248 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1249 * requested. 1250 * 1251 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1252 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1253 * usually not supported. 1254 * 1255 * The following commands are currently not supported: 1256 * 1257 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1258 * MT_ST_WRITE_THRESHOLD. 1259 */ 1260static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1261{ 1262 idetape_tape_t *tape = drive->driver_data; 1263 struct gendisk *disk = tape->disk; 1264 struct ide_atapi_pc pc; 1265 int i, retval; 1266 1267 ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d", 1268 mt_op, mt_count); 1269 1270 switch (mt_op) { 1271 case MTFSF: 1272 case MTFSFM: 1273 case MTBSF: 1274 case MTBSFM: 1275 if (!mt_count) 1276 return 0; 1277 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1278 default: 1279 break; 1280 } 1281 1282 switch (mt_op) { 1283 case MTWEOF: 1284 if (tape->write_prot) 1285 return -EACCES; 1286 ide_tape_discard_merge_buffer(drive, 1); 1287 for (i = 0; i < mt_count; i++) { 1288 retval = idetape_write_filemark(drive); 1289 if (retval) 1290 return retval; 1291 } 1292 return 0; 1293 case MTREW: 1294 ide_tape_discard_merge_buffer(drive, 0); 1295 if (idetape_rewind_tape(drive)) 1296 return -EIO; 1297 return 0; 1298 case MTLOAD: 1299 ide_tape_discard_merge_buffer(drive, 0); 1300 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1301 case MTUNLOAD: 1302 case MTOFFL: 1303 /* 1304 * If door is locked, attempt to unlock before 1305 * attempting to eject. 1306 */ 1307 if (tape->door_locked) { 1308 if (!ide_set_media_lock(drive, disk, 0)) 1309 tape->door_locked = DOOR_UNLOCKED; 1310 } 1311 ide_tape_discard_merge_buffer(drive, 0); 1312 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1313 if (!retval) 1314 clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), 1315 &drive->atapi_flags); 1316 return retval; 1317 case MTNOP: 1318 ide_tape_discard_merge_buffer(drive, 0); 1319 return idetape_flush_tape_buffers(drive); 1320 case MTRETEN: 1321 ide_tape_discard_merge_buffer(drive, 0); 1322 return ide_do_start_stop(drive, disk, 1323 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1324 case MTEOM: 1325 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1326 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1327 case MTERASE: 1328 (void)idetape_rewind_tape(drive); 1329 idetape_create_erase_cmd(&pc); 1330 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1331 case MTSETBLK: 1332 if (mt_count) { 1333 if (mt_count < tape->blk_size || 1334 mt_count % tape->blk_size) 1335 return -EIO; 1336 tape->user_bs_factor = mt_count / tape->blk_size; 1337 clear_bit(ilog2(IDE_AFLAG_DETECT_BS), 1338 &drive->atapi_flags); 1339 } else 1340 set_bit(ilog2(IDE_AFLAG_DETECT_BS), 1341 &drive->atapi_flags); 1342 return 0; 1343 case MTSEEK: 1344 ide_tape_discard_merge_buffer(drive, 0); 1345 return idetape_position_tape(drive, 1346 mt_count * tape->user_bs_factor, tape->partition, 0); 1347 case MTSETPART: 1348 ide_tape_discard_merge_buffer(drive, 0); 1349 return idetape_position_tape(drive, 0, mt_count, 0); 1350 case MTFSR: 1351 case MTBSR: 1352 case MTLOCK: 1353 retval = ide_set_media_lock(drive, disk, 1); 1354 if (retval) 1355 return retval; 1356 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1357 return 0; 1358 case MTUNLOCK: 1359 retval = ide_set_media_lock(drive, disk, 0); 1360 if (retval) 1361 return retval; 1362 tape->door_locked = DOOR_UNLOCKED; 1363 return 0; 1364 default: 1365 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1366 mt_op); 1367 return -EIO; 1368 } 1369} 1370 1371/* 1372 * Our character device ioctls. General mtio.h magnetic io commands are 1373 * supported here, and not in the corresponding block interface. Our own 1374 * ide-tape ioctls are supported on both interfaces. 1375 */ 1376static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1377 unsigned int cmd, unsigned long arg) 1378{ 1379 struct ide_tape_obj *tape = file->private_data; 1380 ide_drive_t *drive = tape->drive; 1381 struct mtop mtop; 1382 struct mtget mtget; 1383 struct mtpos mtpos; 1384 int block_offset = 0, position = tape->first_frame; 1385 void __user *argp = (void __user *)arg; 1386 1387 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd); 1388 1389 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1390 ide_tape_flush_merge_buffer(drive); 1391 idetape_flush_tape_buffers(drive); 1392 } 1393 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1394 block_offset = tape->valid / 1395 (tape->blk_size * tape->user_bs_factor); 1396 position = ide_tape_read_position(drive); 1397 if (position < 0) 1398 return -EIO; 1399 } 1400 switch (cmd) { 1401 case MTIOCTOP: 1402 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1403 return -EFAULT; 1404 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1405 case MTIOCGET: 1406 memset(&mtget, 0, sizeof(struct mtget)); 1407 mtget.mt_type = MT_ISSCSI2; 1408 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1409 mtget.mt_dsreg = 1410 ((tape->blk_size * tape->user_bs_factor) 1411 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1412 1413 if (tape->drv_write_prot) 1414 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1415 1416 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1417 return -EFAULT; 1418 return 0; 1419 case MTIOCPOS: 1420 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1421 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1422 return -EFAULT; 1423 return 0; 1424 default: 1425 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1426 ide_tape_discard_merge_buffer(drive, 1); 1427 return idetape_blkdev_ioctl(drive, cmd, arg); 1428 } 1429} 1430 1431/* 1432 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1433 * block size with the reported value. 1434 */ 1435static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1436{ 1437 idetape_tape_t *tape = drive->driver_data; 1438 struct ide_atapi_pc pc; 1439 u8 buf[12]; 1440 1441 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1442 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1443 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1444 if (tape->blk_size == 0) { 1445 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1446 "block size, assuming 32k\n"); 1447 tape->blk_size = 32768; 1448 } 1449 return; 1450 } 1451 tape->blk_size = (buf[4 + 5] << 16) + 1452 (buf[4 + 6] << 8) + 1453 buf[4 + 7]; 1454 tape->drv_write_prot = (buf[2] & 0x80) >> 7; 1455 1456 ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d", 1457 tape->blk_size, tape->drv_write_prot); 1458} 1459 1460static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1461{ 1462 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1463 ide_drive_t *drive; 1464 idetape_tape_t *tape; 1465 int retval; 1466 1467 if (i >= MAX_HWIFS * MAX_DRIVES) 1468 return -ENXIO; 1469 1470 lock_kernel(); 1471 tape = ide_tape_get(NULL, true, i); 1472 if (!tape) { 1473 unlock_kernel(); 1474 return -ENXIO; 1475 } 1476 1477 drive = tape->drive; 1478 filp->private_data = tape; 1479 1480 ide_debug_log(IDE_DBG_FUNC, "enter"); 1481 1482 /* 1483 * We really want to do nonseekable_open(inode, filp); here, but some 1484 * versions of tar incorrectly call lseek on tapes and bail out if that 1485 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1486 */ 1487 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1488 1489 1490 if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { 1491 retval = -EBUSY; 1492 goto out_put_tape; 1493 } 1494 1495 retval = idetape_wait_ready(drive, 60 * HZ); 1496 if (retval) { 1497 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); 1498 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1499 goto out_put_tape; 1500 } 1501 1502 ide_tape_read_position(drive); 1503 if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) 1504 (void)idetape_rewind_tape(drive); 1505 1506 /* Read block size and write protect status from drive. */ 1507 ide_tape_get_bsize_from_bdesc(drive); 1508 1509 /* Set write protect flag if device is opened as read-only. */ 1510 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1511 tape->write_prot = 1; 1512 else 1513 tape->write_prot = tape->drv_write_prot; 1514 1515 /* Make sure drive isn't write protected if user wants to write. */ 1516 if (tape->write_prot) { 1517 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1518 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1519 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); 1520 retval = -EROFS; 1521 goto out_put_tape; 1522 } 1523 } 1524 1525 /* Lock the tape drive door so user can't eject. */ 1526 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1527 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1528 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1529 tape->door_locked = DOOR_LOCKED; 1530 } 1531 } 1532 unlock_kernel(); 1533 return 0; 1534 1535out_put_tape: 1536 ide_tape_put(tape); 1537 unlock_kernel(); 1538 return retval; 1539} 1540 1541static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1542{ 1543 idetape_tape_t *tape = drive->driver_data; 1544 1545 ide_tape_flush_merge_buffer(drive); 1546 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1547 if (tape->buf != NULL) { 1548 idetape_pad_zeros(drive, tape->blk_size * 1549 (tape->user_bs_factor - 1)); 1550 kfree(tape->buf); 1551 tape->buf = NULL; 1552 } 1553 idetape_write_filemark(drive); 1554 idetape_flush_tape_buffers(drive); 1555 idetape_flush_tape_buffers(drive); 1556} 1557 1558static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1559{ 1560 struct ide_tape_obj *tape = filp->private_data; 1561 ide_drive_t *drive = tape->drive; 1562 unsigned int minor = iminor(inode); 1563 1564 lock_kernel(); 1565 tape = drive->driver_data; 1566 1567 ide_debug_log(IDE_DBG_FUNC, "enter"); 1568 1569 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1570 idetape_write_release(drive, minor); 1571 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1572 if (minor < 128) 1573 ide_tape_discard_merge_buffer(drive, 1); 1574 } 1575 1576 if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), 1577 &drive->atapi_flags)) 1578 (void) idetape_rewind_tape(drive); 1579 1580 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1581 if (tape->door_locked == DOOR_LOCKED) { 1582 if (!ide_set_media_lock(drive, tape->disk, 0)) 1583 tape->door_locked = DOOR_UNLOCKED; 1584 } 1585 } 1586 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); 1587 ide_tape_put(tape); 1588 unlock_kernel(); 1589 return 0; 1590} 1591 1592static void idetape_get_inquiry_results(ide_drive_t *drive) 1593{ 1594 idetape_tape_t *tape = drive->driver_data; 1595 struct ide_atapi_pc pc; 1596 u8 pc_buf[256]; 1597 char fw_rev[4], vendor_id[8], product_id[16]; 1598 1599 idetape_create_inquiry_cmd(&pc); 1600 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { 1601 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1602 tape->name); 1603 return; 1604 } 1605 memcpy(vendor_id, &pc_buf[8], 8); 1606 memcpy(product_id, &pc_buf[16], 16); 1607 memcpy(fw_rev, &pc_buf[32], 4); 1608 1609 ide_fixstring(vendor_id, 8, 0); 1610 ide_fixstring(product_id, 16, 0); 1611 ide_fixstring(fw_rev, 4, 0); 1612 1613 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1614 drive->name, tape->name, vendor_id, product_id, fw_rev); 1615} 1616 1617/* 1618 * Ask the tape about its various parameters. In particular, we will adjust our 1619 * data transfer buffer size to the recommended value as returned by the tape. 1620 */ 1621static void idetape_get_mode_sense_results(ide_drive_t *drive) 1622{ 1623 idetape_tape_t *tape = drive->driver_data; 1624 struct ide_atapi_pc pc; 1625 u8 buf[24], *caps; 1626 u8 speed, max_speed; 1627 1628 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1629 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1630 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1631 " some default values\n"); 1632 tape->blk_size = 512; 1633 put_unaligned(52, (u16 *)&tape->caps[12]); 1634 put_unaligned(540, (u16 *)&tape->caps[14]); 1635 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1636 return; 1637 } 1638 caps = buf + 4 + buf[3]; 1639 1640 /* convert to host order and save for later use */ 1641 speed = be16_to_cpup((__be16 *)&caps[14]); 1642 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1643 1644 *(u16 *)&caps[8] = max_speed; 1645 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1646 *(u16 *)&caps[14] = speed; 1647 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1648 1649 if (!speed) { 1650 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1651 "(assuming 650KB/sec)\n", drive->name); 1652 *(u16 *)&caps[14] = 650; 1653 } 1654 if (!max_speed) { 1655 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1656 "(assuming 650KB/sec)\n", drive->name); 1657 *(u16 *)&caps[8] = 650; 1658 } 1659 1660 memcpy(&tape->caps, caps, 20); 1661 1662 /* device lacks locking support according to capabilities page */ 1663 if ((caps[6] & 1) == 0) 1664 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1665 1666 if (caps[7] & 0x02) 1667 tape->blk_size = 512; 1668 else if (caps[7] & 0x04) 1669 tape->blk_size = 1024; 1670} 1671 1672#ifdef CONFIG_IDE_PROC_FS 1673#define ide_tape_devset_get(name, field) \ 1674static int get_##name(ide_drive_t *drive) \ 1675{ \ 1676 idetape_tape_t *tape = drive->driver_data; \ 1677 return tape->field; \ 1678} 1679 1680#define ide_tape_devset_set(name, field) \ 1681static int set_##name(ide_drive_t *drive, int arg) \ 1682{ \ 1683 idetape_tape_t *tape = drive->driver_data; \ 1684 tape->field = arg; \ 1685 return 0; \ 1686} 1687 1688#define ide_tape_devset_rw_field(_name, _field) \ 1689ide_tape_devset_get(_name, _field) \ 1690ide_tape_devset_set(_name, _field) \ 1691IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1692 1693#define ide_tape_devset_r_field(_name, _field) \ 1694ide_tape_devset_get(_name, _field) \ 1695IDE_DEVSET(_name, 0, get_##_name, NULL) 1696 1697static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1698static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1699static int divf_buffer(ide_drive_t *drive) { return 2; } 1700static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1701 1702ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1703 1704ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1705 1706ide_tape_devset_r_field(avg_speed, avg_speed); 1707ide_tape_devset_r_field(speed, caps[14]); 1708ide_tape_devset_r_field(buffer, caps[16]); 1709ide_tape_devset_r_field(buffer_size, buffer_size); 1710 1711static const struct ide_proc_devset idetape_settings[] = { 1712 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1713 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1714 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1715 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1716 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1717 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1718 mulf_tdsc, divf_tdsc), 1719 { NULL }, 1720}; 1721#endif 1722 1723/* 1724 * The function below is called to: 1725 * 1726 * 1. Initialize our various state variables. 1727 * 2. Ask the tape for its capabilities. 1728 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1729 * is chosen based on the recommendation which we received in step 2. 1730 * 1731 * Note that at this point ide.c already assigned us an irq, so that we can 1732 * queue requests here and wait for their completion. 1733 */ 1734static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1735{ 1736 unsigned long t; 1737 int speed; 1738 int buffer_size; 1739 u16 *ctl = (u16 *)&tape->caps[12]; 1740 1741 ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor); 1742 1743 drive->pc_callback = ide_tape_callback; 1744 1745 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1746 1747 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1748 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1749 tape->name); 1750 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1751 } 1752 1753 /* Seagate Travan drives do not support DSC overlap. */ 1754 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1755 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1756 1757 tape->minor = minor; 1758 tape->name[0] = 'h'; 1759 tape->name[1] = 't'; 1760 tape->name[2] = '0' + minor; 1761 tape->chrdev_dir = IDETAPE_DIR_NONE; 1762 1763 idetape_get_inquiry_results(drive); 1764 idetape_get_mode_sense_results(drive); 1765 ide_tape_get_bsize_from_bdesc(drive); 1766 tape->user_bs_factor = 1; 1767 tape->buffer_size = *ctl * tape->blk_size; 1768 while (tape->buffer_size > 0xffff) { 1769 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1770 *ctl /= 2; 1771 tape->buffer_size = *ctl * tape->blk_size; 1772 } 1773 buffer_size = tape->buffer_size; 1774 1775 /* select the "best" DSC read/write polling freq */ 1776 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1777 1778 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1779 1780 /* 1781 * Ensure that the number we got makes sense; limit it within 1782 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1783 */ 1784 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1785 IDETAPE_DSC_RW_MAX); 1786 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1787 "%lums tDSC%s\n", 1788 drive->name, tape->name, *(u16 *)&tape->caps[14], 1789 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1790 tape->buffer_size / 1024, 1791 tape->best_dsc_rw_freq * 1000 / HZ, 1792 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1793 1794 ide_proc_register_driver(drive, tape->driver); 1795} 1796 1797static void ide_tape_remove(ide_drive_t *drive) 1798{ 1799 idetape_tape_t *tape = drive->driver_data; 1800 1801 ide_proc_unregister_driver(drive, tape->driver); 1802 device_del(&tape->dev); 1803 ide_unregister_region(tape->disk); 1804 1805 mutex_lock(&idetape_ref_mutex); 1806 put_device(&tape->dev); 1807 mutex_unlock(&idetape_ref_mutex); 1808} 1809 1810static void ide_tape_release(struct device *dev) 1811{ 1812 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1813 ide_drive_t *drive = tape->drive; 1814 struct gendisk *g = tape->disk; 1815 1816 BUG_ON(tape->valid); 1817 1818 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1819 drive->driver_data = NULL; 1820 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1821 device_destroy(idetape_sysfs_class, 1822 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1823 idetape_devs[tape->minor] = NULL; 1824 g->private_data = NULL; 1825 put_disk(g); 1826 kfree(tape); 1827} 1828 1829#ifdef CONFIG_IDE_PROC_FS 1830static int proc_idetape_read_name 1831 (char *page, char **start, off_t off, int count, int *eof, void *data) 1832{ 1833 ide_drive_t *drive = (ide_drive_t *) data; 1834 idetape_tape_t *tape = drive->driver_data; 1835 char *out = page; 1836 int len; 1837 1838 len = sprintf(out, "%s\n", tape->name); 1839 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1840} 1841 1842static ide_proc_entry_t idetape_proc[] = { 1843 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1844 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1845 { NULL, 0, NULL, NULL } 1846}; 1847 1848static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1849{ 1850 return idetape_proc; 1851} 1852 1853static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1854{ 1855 return idetape_settings; 1856} 1857#endif 1858 1859static int ide_tape_probe(ide_drive_t *); 1860 1861static struct ide_driver idetape_driver = { 1862 .gen_driver = { 1863 .owner = THIS_MODULE, 1864 .name = "ide-tape", 1865 .bus = &ide_bus_type, 1866 }, 1867 .probe = ide_tape_probe, 1868 .remove = ide_tape_remove, 1869 .version = IDETAPE_VERSION, 1870 .do_request = idetape_do_request, 1871#ifdef CONFIG_IDE_PROC_FS 1872 .proc_entries = ide_tape_proc_entries, 1873 .proc_devsets = ide_tape_proc_devsets, 1874#endif 1875}; 1876 1877/* Our character device supporting functions, passed to register_chrdev. */ 1878static const struct file_operations idetape_fops = { 1879 .owner = THIS_MODULE, 1880 .read = idetape_chrdev_read, 1881 .write = idetape_chrdev_write, 1882 .ioctl = idetape_chrdev_ioctl, 1883 .open = idetape_chrdev_open, 1884 .release = idetape_chrdev_release, 1885}; 1886 1887static int idetape_open(struct block_device *bdev, fmode_t mode) 1888{ 1889 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0); 1890 1891 if (!tape) 1892 return -ENXIO; 1893 1894 return 0; 1895} 1896 1897static int idetape_release(struct gendisk *disk, fmode_t mode) 1898{ 1899 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1900 1901 ide_tape_put(tape); 1902 return 0; 1903} 1904 1905static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1906 unsigned int cmd, unsigned long arg) 1907{ 1908 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1909 ide_drive_t *drive = tape->drive; 1910 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1911 if (err == -EINVAL) 1912 err = idetape_blkdev_ioctl(drive, cmd, arg); 1913 return err; 1914} 1915 1916static struct block_device_operations idetape_block_ops = { 1917 .owner = THIS_MODULE, 1918 .open = idetape_open, 1919 .release = idetape_release, 1920 .locked_ioctl = idetape_ioctl, 1921}; 1922 1923static int ide_tape_probe(ide_drive_t *drive) 1924{ 1925 idetape_tape_t *tape; 1926 struct gendisk *g; 1927 int minor; 1928 1929 ide_debug_log(IDE_DBG_FUNC, "enter"); 1930 1931 if (!strstr(DRV_NAME, drive->driver_req)) 1932 goto failed; 1933 1934 if (drive->media != ide_tape) 1935 goto failed; 1936 1937 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 1938 ide_check_atapi_device(drive, DRV_NAME) == 0) { 1939 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 1940 " the driver\n", drive->name); 1941 goto failed; 1942 } 1943 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 1944 if (tape == NULL) { 1945 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 1946 drive->name); 1947 goto failed; 1948 } 1949 1950 g = alloc_disk(1 << PARTN_BITS); 1951 if (!g) 1952 goto out_free_tape; 1953 1954 ide_init_disk(g, drive); 1955 1956 tape->dev.parent = &drive->gendev; 1957 tape->dev.release = ide_tape_release; 1958 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 1959 1960 if (device_register(&tape->dev)) 1961 goto out_free_disk; 1962 1963 tape->drive = drive; 1964 tape->driver = &idetape_driver; 1965 tape->disk = g; 1966 1967 g->private_data = &tape->driver; 1968 1969 drive->driver_data = tape; 1970 1971 mutex_lock(&idetape_ref_mutex); 1972 for (minor = 0; idetape_devs[minor]; minor++) 1973 ; 1974 idetape_devs[minor] = tape; 1975 mutex_unlock(&idetape_ref_mutex); 1976 1977 idetape_setup(drive, tape, minor); 1978 1979 device_create(idetape_sysfs_class, &drive->gendev, 1980 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 1981 device_create(idetape_sysfs_class, &drive->gendev, 1982 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 1983 "n%s", tape->name); 1984 1985 g->fops = &idetape_block_ops; 1986 ide_register_region(g); 1987 1988 return 0; 1989 1990out_free_disk: 1991 put_disk(g); 1992out_free_tape: 1993 kfree(tape); 1994failed: 1995 return -ENODEV; 1996} 1997 1998static void __exit idetape_exit(void) 1999{ 2000 driver_unregister(&idetape_driver.gen_driver); 2001 class_destroy(idetape_sysfs_class); 2002 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2003} 2004 2005static int __init idetape_init(void) 2006{ 2007 int error = 1; 2008 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2009 if (IS_ERR(idetape_sysfs_class)) { 2010 idetape_sysfs_class = NULL; 2011 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2012 error = -EBUSY; 2013 goto out; 2014 } 2015 2016 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2017 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2018 " interface\n"); 2019 error = -EBUSY; 2020 goto out_free_class; 2021 } 2022 2023 error = driver_register(&idetape_driver.gen_driver); 2024 if (error) 2025 goto out_free_driver; 2026 2027 return 0; 2028 2029out_free_driver: 2030 driver_unregister(&idetape_driver.gen_driver); 2031out_free_class: 2032 class_destroy(idetape_sysfs_class); 2033out: 2034 return error; 2035} 2036 2037MODULE_ALIAS("ide:*m-tape*"); 2038module_init(idetape_init); 2039module_exit(idetape_exit); 2040MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2041MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2042MODULE_LICENSE("GPL"); 2043