ide-tape.c revision 19f52a784f7ecb5b51cd73cc4514614b600b995a
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) 292{ 293 idetape_tape_t *tape = drive->driver_data; 294 struct ide_atapi_pc *pc = drive->failed_pc; 295 struct request *rq = drive->hwif->rq; 296 u8 *sense = bio_data(rq->bio); 297 298 tape->sense_key = sense[2] & 0xF; 299 tape->asc = sense[12]; 300 tape->ascq = sense[13]; 301 302 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", 303 pc->c[0], tape->sense_key, tape->asc, tape->ascq); 304 305 /* correct remaining bytes to transfer */ 306 if (pc->flags & PC_FLAG_DMA_ERROR) 307 rq->resid_len = tape->blk_size * 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 (blk_rq_bytes(rq) - rq->resid_len)) 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); 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 unsigned int blocks = 372 (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; 373 374 tape->avg_size += blocks * tape->blk_size; 375 376 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 377 tape->avg_speed = tape->avg_size * HZ / 378 (jiffies - tape->avg_time) / 1024; 379 tape->avg_size = 0; 380 tape->avg_time = jiffies; 381 } 382 383 tape->first_frame += blocks; 384 385 if (pc->error) { 386 uptodate = 0; 387 err = pc->error; 388 } 389 } 390 rq->errors = err; 391 392 return uptodate; 393} 394 395/* 396 * Postpone the current request so that ide.c will be able to service requests 397 * from another device on the same port while we are polling for DSC. 398 */ 399static void idetape_postpone_request(ide_drive_t *drive) 400{ 401 idetape_tape_t *tape = drive->driver_data; 402 403 debug_log(DBG_PROCS, "Enter %s\n", __func__); 404 405 tape->postponed_rq = drive->hwif->rq; 406 407 ide_stall_queue(drive, tape->dsc_poll_freq); 408} 409 410static void ide_tape_handle_dsc(ide_drive_t *drive) 411{ 412 idetape_tape_t *tape = drive->driver_data; 413 414 /* Media access command */ 415 tape->dsc_polling_start = jiffies; 416 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 417 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 418 /* Allow ide.c to handle other requests */ 419 idetape_postpone_request(drive); 420} 421 422/* 423 * Packet Command Interface 424 * 425 * The current Packet Command is available in drive->pc, and will not change 426 * until we finish handling it. Each packet command is associated with a 427 * callback function that will be called when the command is finished. 428 * 429 * The handling will be done in three stages: 430 * 431 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set 432 * the interrupt handler to ide_pc_intr. 433 * 434 * 2. On each interrupt, ide_pc_intr will be called. This step will be 435 * repeated until the device signals us that no more interrupts will be issued. 436 * 437 * 3. ATAPI Tape media access commands have immediate status with a delayed 438 * process. In case of a successful initiation of a media access packet command, 439 * the DSC bit will be set when the actual execution of the command is finished. 440 * Since the tape drive will not issue an interrupt, we have to poll for this 441 * event. In this case, we define the request as "low priority request" by 442 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 443 * exit the driver. 444 * 445 * ide.c will then give higher priority to requests which originate from the 446 * other device, until will change rq_status to RQ_ACTIVE. 447 * 448 * 4. When the packet command is finished, it will be checked for errors. 449 * 450 * 5. In case an error was found, we queue a request sense packet command in 451 * front of the request queue and retry the operation up to 452 * IDETAPE_MAX_PC_RETRIES times. 453 * 454 * 6. In case no error was found, or we decided to give up and not to retry 455 * again, the callback function will be called and then we will handle the next 456 * request. 457 */ 458 459static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, 460 struct ide_cmd *cmd, 461 struct ide_atapi_pc *pc) 462{ 463 idetape_tape_t *tape = drive->driver_data; 464 struct request *rq = drive->hwif->rq; 465 466 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 467 drive->failed_pc = pc; 468 469 /* Set the current packet command */ 470 drive->pc = pc; 471 472 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 473 (pc->flags & PC_FLAG_ABORT)) { 474 475 /* 476 * We will "abort" retrying a packet command in case legitimate 477 * error code was received (crossing a filemark, or end of the 478 * media, for example). 479 */ 480 if (!(pc->flags & PC_FLAG_ABORT)) { 481 if (!(pc->c[0] == TEST_UNIT_READY && 482 tape->sense_key == 2 && tape->asc == 4 && 483 (tape->ascq == 1 || tape->ascq == 8))) { 484 printk(KERN_ERR "ide-tape: %s: I/O error, " 485 "pc = %2x, key = %2x, " 486 "asc = %2x, ascq = %2x\n", 487 tape->name, pc->c[0], 488 tape->sense_key, tape->asc, 489 tape->ascq); 490 } 491 /* Giving up */ 492 pc->error = IDE_DRV_ERROR_GENERAL; 493 } 494 495 drive->failed_pc = NULL; 496 drive->pc_callback(drive, 0); 497 ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); 498 return ide_stopped; 499 } 500 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); 501 502 pc->retries++; 503 504 return ide_issue_pc(drive, cmd); 505} 506 507/* A mode sense command is used to "sense" tape parameters. */ 508static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 509{ 510 ide_init_pc(pc); 511 pc->c[0] = MODE_SENSE; 512 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 513 /* DBD = 1 - Don't return block descriptors */ 514 pc->c[1] = 8; 515 pc->c[2] = page_code; 516 /* 517 * Changed pc->c[3] to 0 (255 will at best return unused info). 518 * 519 * For SCSI this byte is defined as subpage instead of high byte 520 * of length and some IDE drives seem to interpret it this way 521 * and return an error when 255 is used. 522 */ 523 pc->c[3] = 0; 524 /* We will just discard data in that case */ 525 pc->c[4] = 255; 526 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 527 pc->req_xfer = 12; 528 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 529 pc->req_xfer = 24; 530 else 531 pc->req_xfer = 50; 532} 533 534static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 535{ 536 ide_hwif_t *hwif = drive->hwif; 537 idetape_tape_t *tape = drive->driver_data; 538 struct ide_atapi_pc *pc = drive->pc; 539 u8 stat; 540 541 stat = hwif->tp_ops->read_status(hwif); 542 543 if (stat & ATA_DSC) { 544 if (stat & ATA_ERR) { 545 /* Error detected */ 546 if (pc->c[0] != TEST_UNIT_READY) 547 printk(KERN_ERR "ide-tape: %s: I/O error, ", 548 tape->name); 549 /* Retry operation */ 550 ide_retry_pc(drive); 551 return ide_stopped; 552 } 553 pc->error = 0; 554 } else { 555 pc->error = IDE_DRV_ERROR_GENERAL; 556 drive->failed_pc = NULL; 557 } 558 drive->pc_callback(drive, 0); 559 return ide_stopped; 560} 561 562static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 563 struct ide_atapi_pc *pc, struct request *rq, 564 u8 opcode) 565{ 566 unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); 567 568 ide_init_pc(pc); 569 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 570 pc->c[1] = 1; 571 572 if (blk_rq_bytes(rq) == tape->buffer_size) 573 pc->flags |= PC_FLAG_DMA_OK; 574 575 if (opcode == READ_6) 576 pc->c[0] = READ_6; 577 else if (opcode == WRITE_6) { 578 pc->c[0] = WRITE_6; 579 pc->flags |= PC_FLAG_WRITING; 580 } 581 582 memcpy(rq->cmd, pc->c, 12); 583} 584 585static ide_startstop_t idetape_do_request(ide_drive_t *drive, 586 struct request *rq, sector_t block) 587{ 588 ide_hwif_t *hwif = drive->hwif; 589 idetape_tape_t *tape = drive->driver_data; 590 struct ide_atapi_pc *pc = NULL; 591 struct request *postponed_rq = tape->postponed_rq; 592 struct ide_cmd cmd; 593 u8 stat; 594 595 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n" 596 (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq)); 597 598 if (!(blk_special_request(rq) || blk_sense_request(rq))) { 599 /* We do not support buffer cache originated requests. */ 600 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 601 "request queue (%d)\n", drive->name, rq->cmd_type); 602 if (blk_fs_request(rq) == 0 && rq->errors == 0) 603 rq->errors = -EIO; 604 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); 605 return ide_stopped; 606 } 607 608 /* Retry a failed packet command */ 609 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 610 pc = drive->failed_pc; 611 goto out; 612 } 613 614 if (postponed_rq != NULL) 615 if (rq != postponed_rq) { 616 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 617 "Two DSC requests were queued\n"); 618 drive->failed_pc = NULL; 619 rq->errors = 0; 620 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 621 return ide_stopped; 622 } 623 624 tape->postponed_rq = NULL; 625 626 /* 627 * If the tape is still busy, postpone our request and service 628 * the other device meanwhile. 629 */ 630 stat = hwif->tp_ops->read_status(hwif); 631 632 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 633 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 634 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 635 636 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 637 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 638 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 639 } 640 641 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && 642 (stat & ATA_DSC) == 0) { 643 if (postponed_rq == NULL) { 644 tape->dsc_polling_start = jiffies; 645 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 646 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 647 } else if (time_after(jiffies, tape->dsc_timeout)) { 648 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 649 tape->name); 650 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 651 idetape_media_access_finished(drive); 652 return ide_stopped; 653 } else { 654 return ide_do_reset(drive); 655 } 656 } else if (time_after(jiffies, 657 tape->dsc_polling_start + 658 IDETAPE_DSC_MA_THRESHOLD)) 659 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 660 idetape_postpone_request(drive); 661 return ide_stopped; 662 } 663 if (rq->cmd[13] & REQ_IDETAPE_READ) { 664 pc = &tape->queued_pc; 665 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 666 goto out; 667 } 668 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 669 pc = &tape->queued_pc; 670 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 671 goto out; 672 } 673 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 674 pc = (struct ide_atapi_pc *)rq->special; 675 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 676 rq->cmd[13] |= REQ_IDETAPE_PC2; 677 goto out; 678 } 679 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 680 idetape_media_access_finished(drive); 681 return ide_stopped; 682 } 683 BUG(); 684 685out: 686 /* prepare sense request for this command */ 687 ide_prep_sense(drive, rq); 688 689 memset(&cmd, 0, sizeof(cmd)); 690 691 if (rq_data_dir(rq)) 692 cmd.tf_flags |= IDE_TFLAG_WRITE; 693 694 cmd.rq = rq; 695 696 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); 697 ide_map_sg(drive, &cmd); 698 699 return ide_tape_issue_pc(drive, &cmd, pc); 700} 701 702/* 703 * Write a filemark if write_filemark=1. Flush the device buffers without 704 * writing a filemark otherwise. 705 */ 706static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 707 struct ide_atapi_pc *pc, int write_filemark) 708{ 709 ide_init_pc(pc); 710 pc->c[0] = WRITE_FILEMARKS; 711 pc->c[4] = write_filemark; 712 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 713} 714 715static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 716{ 717 idetape_tape_t *tape = drive->driver_data; 718 struct gendisk *disk = tape->disk; 719 int load_attempted = 0; 720 721 /* Wait for the tape to become ready */ 722 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 723 timeout += jiffies; 724 while (time_before(jiffies, timeout)) { 725 if (ide_do_test_unit_ready(drive, disk) == 0) 726 return 0; 727 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 728 || (tape->asc == 0x3A)) { 729 /* no media */ 730 if (load_attempted) 731 return -ENOMEDIUM; 732 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 733 load_attempted = 1; 734 /* not about to be ready */ 735 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 736 (tape->ascq == 1 || tape->ascq == 8))) 737 return -EIO; 738 msleep(100); 739 } 740 return -EIO; 741} 742 743static int idetape_flush_tape_buffers(ide_drive_t *drive) 744{ 745 struct ide_tape_obj *tape = drive->driver_data; 746 struct ide_atapi_pc pc; 747 int rc; 748 749 idetape_create_write_filemark_cmd(drive, &pc, 0); 750 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); 751 if (rc) 752 return rc; 753 idetape_wait_ready(drive, 60 * 5 * HZ); 754 return 0; 755} 756 757static int ide_tape_read_position(ide_drive_t *drive) 758{ 759 idetape_tape_t *tape = drive->driver_data; 760 struct ide_atapi_pc pc; 761 u8 buf[20]; 762 763 debug_log(DBG_PROCS, "Enter %s\n", __func__); 764 765 /* prep cmd */ 766 ide_init_pc(&pc); 767 pc.c[0] = READ_POSITION; 768 pc.req_xfer = 20; 769 770 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) 771 return -1; 772 773 if (!pc.error) { 774 debug_log(DBG_SENSE, "BOP - %s\n", 775 (buf[0] & 0x80) ? "Yes" : "No"); 776 debug_log(DBG_SENSE, "EOP - %s\n", 777 (buf[0] & 0x40) ? "Yes" : "No"); 778 779 if (buf[0] & 0x4) { 780 printk(KERN_INFO "ide-tape: Block location is unknown" 781 "to the tape\n"); 782 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 783 return -1; 784 } else { 785 debug_log(DBG_SENSE, "Block Location - %u\n", 786 be32_to_cpup((__be32 *)&buf[4])); 787 788 tape->partition = buf[1]; 789 tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); 790 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 791 } 792 } 793 794 return tape->first_frame; 795} 796 797static void idetape_create_locate_cmd(ide_drive_t *drive, 798 struct ide_atapi_pc *pc, 799 unsigned int block, u8 partition, int skip) 800{ 801 ide_init_pc(pc); 802 pc->c[0] = POSITION_TO_ELEMENT; 803 pc->c[1] = 2; 804 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 805 pc->c[8] = partition; 806 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 807} 808 809static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 810{ 811 idetape_tape_t *tape = drive->driver_data; 812 813 if (tape->chrdev_dir != IDETAPE_DIR_READ) 814 return; 815 816 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 817 tape->valid = 0; 818 if (tape->buf != NULL) { 819 kfree(tape->buf); 820 tape->buf = NULL; 821 } 822 823 tape->chrdev_dir = IDETAPE_DIR_NONE; 824} 825 826/* 827 * Position the tape to the requested block using the LOCATE packet command. 828 * A READ POSITION command is then issued to check where we are positioned. Like 829 * all higher level operations, we queue the commands at the tail of the request 830 * queue and wait for their completion. 831 */ 832static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 833 u8 partition, int skip) 834{ 835 idetape_tape_t *tape = drive->driver_data; 836 struct gendisk *disk = tape->disk; 837 int ret; 838 struct ide_atapi_pc pc; 839 840 if (tape->chrdev_dir == IDETAPE_DIR_READ) 841 __ide_tape_discard_merge_buffer(drive); 842 idetape_wait_ready(drive, 60 * 5 * HZ); 843 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 844 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 845 if (ret) 846 return ret; 847 848 ret = ide_tape_read_position(drive); 849 if (ret < 0) 850 return ret; 851 return 0; 852} 853 854static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 855 int restore_position) 856{ 857 idetape_tape_t *tape = drive->driver_data; 858 int seek, position; 859 860 __ide_tape_discard_merge_buffer(drive); 861 if (restore_position) { 862 position = ide_tape_read_position(drive); 863 seek = position > 0 ? position : 0; 864 if (idetape_position_tape(drive, seek, 0, 0)) { 865 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 866 " %s\n", tape->name, __func__); 867 return; 868 } 869 } 870} 871 872/* 873 * Generate a read/write request for the block device interface and wait for it 874 * to be serviced. 875 */ 876static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 877{ 878 idetape_tape_t *tape = drive->driver_data; 879 struct request *rq; 880 int ret; 881 882 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 883 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 884 BUG_ON(size < 0 || size % tape->blk_size); 885 886 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 887 rq->cmd_type = REQ_TYPE_SPECIAL; 888 rq->cmd[13] = cmd; 889 rq->rq_disk = tape->disk; 890 891 if (size) { 892 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 893 __GFP_WAIT); 894 if (ret) 895 goto out_put; 896 } 897 898 blk_execute_rq(drive->queue, tape->disk, rq, 0); 899 900 /* calculate the number of transferred bytes and update buffer state */ 901 size -= rq->resid_len; 902 tape->cur = tape->buf; 903 if (cmd == REQ_IDETAPE_READ) 904 tape->valid = size; 905 else 906 tape->valid = 0; 907 908 ret = size; 909 if (rq->errors == IDE_DRV_ERROR_GENERAL) 910 ret = -EIO; 911out_put: 912 blk_put_request(rq); 913 return ret; 914} 915 916static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 917{ 918 ide_init_pc(pc); 919 pc->c[0] = INQUIRY; 920 pc->c[4] = 254; 921 pc->req_xfer = 254; 922} 923 924static void idetape_create_rewind_cmd(ide_drive_t *drive, 925 struct ide_atapi_pc *pc) 926{ 927 ide_init_pc(pc); 928 pc->c[0] = REZERO_UNIT; 929 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 930} 931 932static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 933{ 934 ide_init_pc(pc); 935 pc->c[0] = ERASE; 936 pc->c[1] = 1; 937 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 938} 939 940static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 941{ 942 ide_init_pc(pc); 943 pc->c[0] = SPACE; 944 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 945 pc->c[1] = cmd; 946 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 947} 948 949static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 950{ 951 idetape_tape_t *tape = drive->driver_data; 952 953 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 954 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 955 " but we are not writing.\n"); 956 return; 957 } 958 if (tape->buf) { 959 size_t aligned = roundup(tape->valid, tape->blk_size); 960 961 memset(tape->cur, 0, aligned - tape->valid); 962 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); 963 kfree(tape->buf); 964 tape->buf = NULL; 965 } 966 tape->chrdev_dir = IDETAPE_DIR_NONE; 967} 968 969static int idetape_init_rw(ide_drive_t *drive, int dir) 970{ 971 idetape_tape_t *tape = drive->driver_data; 972 int rc; 973 974 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 975 976 if (tape->chrdev_dir == dir) 977 return 0; 978 979 if (tape->chrdev_dir == IDETAPE_DIR_READ) 980 ide_tape_discard_merge_buffer(drive, 1); 981 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 982 ide_tape_flush_merge_buffer(drive); 983 idetape_flush_tape_buffers(drive); 984 } 985 986 if (tape->buf || tape->valid) { 987 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 988 tape->valid = 0; 989 } 990 991 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 992 if (!tape->buf) 993 return -ENOMEM; 994 tape->chrdev_dir = dir; 995 tape->cur = tape->buf; 996 997 /* 998 * Issue a 0 rw command to ensure that DSC handshake is 999 * switched from completion mode to buffer available mode. No 1000 * point in issuing this if DSC overlap isn't supported, some 1001 * drives (Seagate STT3401A) will return an error. 1002 */ 1003 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1004 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 1005 : REQ_IDETAPE_WRITE; 1006 1007 rc = idetape_queue_rw_tail(drive, cmd, 0); 1008 if (rc < 0) { 1009 kfree(tape->buf); 1010 tape->buf = NULL; 1011 tape->chrdev_dir = IDETAPE_DIR_NONE; 1012 return rc; 1013 } 1014 } 1015 1016 return 0; 1017} 1018 1019static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1020{ 1021 idetape_tape_t *tape = drive->driver_data; 1022 1023 memset(tape->buf, 0, tape->buffer_size); 1024 1025 while (bcount) { 1026 unsigned int count = min(tape->buffer_size, bcount); 1027 1028 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1029 bcount -= count; 1030 } 1031} 1032 1033/* 1034 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1035 * currently support only one partition. 1036 */ 1037static int idetape_rewind_tape(ide_drive_t *drive) 1038{ 1039 struct ide_tape_obj *tape = drive->driver_data; 1040 struct gendisk *disk = tape->disk; 1041 struct ide_atapi_pc pc; 1042 int ret; 1043 1044 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1045 1046 idetape_create_rewind_cmd(drive, &pc); 1047 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1048 if (ret) 1049 return ret; 1050 1051 ret = ide_tape_read_position(drive); 1052 if (ret < 0) 1053 return ret; 1054 return 0; 1055} 1056 1057/* mtio.h compatible commands should be issued to the chrdev interface. */ 1058static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1059 unsigned long arg) 1060{ 1061 idetape_tape_t *tape = drive->driver_data; 1062 void __user *argp = (void __user *)arg; 1063 1064 struct idetape_config { 1065 int dsc_rw_frequency; 1066 int dsc_media_access_frequency; 1067 int nr_stages; 1068 } config; 1069 1070 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1071 1072 switch (cmd) { 1073 case 0x0340: 1074 if (copy_from_user(&config, argp, sizeof(config))) 1075 return -EFAULT; 1076 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1077 break; 1078 case 0x0350: 1079 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1080 config.nr_stages = 1; 1081 if (copy_to_user(argp, &config, sizeof(config))) 1082 return -EFAULT; 1083 break; 1084 default: 1085 return -EIO; 1086 } 1087 return 0; 1088} 1089 1090static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1091 int mt_count) 1092{ 1093 idetape_tape_t *tape = drive->driver_data; 1094 struct gendisk *disk = tape->disk; 1095 struct ide_atapi_pc pc; 1096 int retval, count = 0; 1097 int sprev = !!(tape->caps[4] & 0x20); 1098 1099 if (mt_count == 0) 1100 return 0; 1101 if (MTBSF == mt_op || MTBSFM == mt_op) { 1102 if (!sprev) 1103 return -EIO; 1104 mt_count = -mt_count; 1105 } 1106 1107 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1108 tape->valid = 0; 1109 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1110 ++count; 1111 ide_tape_discard_merge_buffer(drive, 0); 1112 } 1113 1114 switch (mt_op) { 1115 case MTFSF: 1116 case MTBSF: 1117 idetape_create_space_cmd(&pc, mt_count - count, 1118 IDETAPE_SPACE_OVER_FILEMARK); 1119 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1120 case MTFSFM: 1121 case MTBSFM: 1122 if (!sprev) 1123 return -EIO; 1124 retval = idetape_space_over_filemarks(drive, MTFSF, 1125 mt_count - count); 1126 if (retval) 1127 return retval; 1128 count = (MTBSFM == mt_op ? 1 : -1); 1129 return idetape_space_over_filemarks(drive, MTFSF, count); 1130 default: 1131 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1132 mt_op); 1133 return -EIO; 1134 } 1135} 1136 1137/* 1138 * Our character device read / write functions. 1139 * 1140 * The tape is optimized to maximize throughput when it is transferring an 1141 * integral number of the "continuous transfer limit", which is a parameter of 1142 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1143 * 1144 * As of version 1.3 of the driver, the character device provides an abstract 1145 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1146 * same backup/restore procedure is supported. The driver will internally 1147 * convert the requests to the recommended transfer unit, so that an unmatch 1148 * between the user's block size to the recommended size will only result in a 1149 * (slightly) increased driver overhead, but will no longer hit performance. 1150 * This is not applicable to Onstream. 1151 */ 1152static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1153 size_t count, loff_t *ppos) 1154{ 1155 struct ide_tape_obj *tape = file->private_data; 1156 ide_drive_t *drive = tape->drive; 1157 size_t done = 0; 1158 ssize_t ret = 0; 1159 int rc; 1160 1161 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1162 1163 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1164 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1165 if (count > tape->blk_size && 1166 (count % tape->blk_size) == 0) 1167 tape->user_bs_factor = count / tape->blk_size; 1168 } 1169 1170 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1171 if (rc < 0) 1172 return rc; 1173 1174 while (done < count) { 1175 size_t todo; 1176 1177 /* refill if staging buffer is empty */ 1178 if (!tape->valid) { 1179 /* If we are at a filemark, nothing more to read */ 1180 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1181 break; 1182 /* read */ 1183 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1184 tape->buffer_size) <= 0) 1185 break; 1186 } 1187 1188 /* copy out */ 1189 todo = min_t(size_t, count - done, tape->valid); 1190 if (copy_to_user(buf + done, tape->cur, todo)) 1191 ret = -EFAULT; 1192 1193 tape->cur += todo; 1194 tape->valid -= todo; 1195 done += todo; 1196 } 1197 1198 if (!done && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1199 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1200 1201 idetape_space_over_filemarks(drive, MTFSF, 1); 1202 return 0; 1203 } 1204 1205 return ret ? ret : done; 1206} 1207 1208static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1209 size_t count, loff_t *ppos) 1210{ 1211 struct ide_tape_obj *tape = file->private_data; 1212 ide_drive_t *drive = tape->drive; 1213 size_t done = 0; 1214 ssize_t ret = 0; 1215 int rc; 1216 1217 /* The drive is write protected. */ 1218 if (tape->write_prot) 1219 return -EACCES; 1220 1221 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1222 1223 /* Initialize write operation */ 1224 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1225 if (rc < 0) 1226 return rc; 1227 1228 while (done < count) { 1229 size_t todo; 1230 1231 /* flush if staging buffer is full */ 1232 if (tape->valid == tape->buffer_size && 1233 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1234 tape->buffer_size) <= 0) 1235 return rc; 1236 1237 /* copy in */ 1238 todo = min_t(size_t, count - done, 1239 tape->buffer_size - tape->valid); 1240 if (copy_from_user(tape->cur, buf + done, todo)) 1241 ret = -EFAULT; 1242 1243 tape->cur += todo; 1244 tape->valid += todo; 1245 done += todo; 1246 } 1247 1248 return ret ? ret : done; 1249} 1250 1251static int idetape_write_filemark(ide_drive_t *drive) 1252{ 1253 struct ide_tape_obj *tape = drive->driver_data; 1254 struct ide_atapi_pc pc; 1255 1256 /* Write a filemark */ 1257 idetape_create_write_filemark_cmd(drive, &pc, 1); 1258 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { 1259 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1260 return -EIO; 1261 } 1262 return 0; 1263} 1264 1265/* 1266 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1267 * requested. 1268 * 1269 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1270 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1271 * usually not supported. 1272 * 1273 * The following commands are currently not supported: 1274 * 1275 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1276 * MT_ST_WRITE_THRESHOLD. 1277 */ 1278static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1279{ 1280 idetape_tape_t *tape = drive->driver_data; 1281 struct gendisk *disk = tape->disk; 1282 struct ide_atapi_pc pc; 1283 int i, retval; 1284 1285 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1286 mt_op, mt_count); 1287 1288 switch (mt_op) { 1289 case MTFSF: 1290 case MTFSFM: 1291 case MTBSF: 1292 case MTBSFM: 1293 if (!mt_count) 1294 return 0; 1295 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1296 default: 1297 break; 1298 } 1299 1300 switch (mt_op) { 1301 case MTWEOF: 1302 if (tape->write_prot) 1303 return -EACCES; 1304 ide_tape_discard_merge_buffer(drive, 1); 1305 for (i = 0; i < mt_count; i++) { 1306 retval = idetape_write_filemark(drive); 1307 if (retval) 1308 return retval; 1309 } 1310 return 0; 1311 case MTREW: 1312 ide_tape_discard_merge_buffer(drive, 0); 1313 if (idetape_rewind_tape(drive)) 1314 return -EIO; 1315 return 0; 1316 case MTLOAD: 1317 ide_tape_discard_merge_buffer(drive, 0); 1318 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1319 case MTUNLOAD: 1320 case MTOFFL: 1321 /* 1322 * If door is locked, attempt to unlock before 1323 * attempting to eject. 1324 */ 1325 if (tape->door_locked) { 1326 if (!ide_set_media_lock(drive, disk, 0)) 1327 tape->door_locked = DOOR_UNLOCKED; 1328 } 1329 ide_tape_discard_merge_buffer(drive, 0); 1330 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1331 if (!retval) 1332 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1333 return retval; 1334 case MTNOP: 1335 ide_tape_discard_merge_buffer(drive, 0); 1336 return idetape_flush_tape_buffers(drive); 1337 case MTRETEN: 1338 ide_tape_discard_merge_buffer(drive, 0); 1339 return ide_do_start_stop(drive, disk, 1340 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1341 case MTEOM: 1342 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1343 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1344 case MTERASE: 1345 (void)idetape_rewind_tape(drive); 1346 idetape_create_erase_cmd(&pc); 1347 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1348 case MTSETBLK: 1349 if (mt_count) { 1350 if (mt_count < tape->blk_size || 1351 mt_count % tape->blk_size) 1352 return -EIO; 1353 tape->user_bs_factor = mt_count / tape->blk_size; 1354 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1355 } else 1356 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1357 return 0; 1358 case MTSEEK: 1359 ide_tape_discard_merge_buffer(drive, 0); 1360 return idetape_position_tape(drive, 1361 mt_count * tape->user_bs_factor, tape->partition, 0); 1362 case MTSETPART: 1363 ide_tape_discard_merge_buffer(drive, 0); 1364 return idetape_position_tape(drive, 0, mt_count, 0); 1365 case MTFSR: 1366 case MTBSR: 1367 case MTLOCK: 1368 retval = ide_set_media_lock(drive, disk, 1); 1369 if (retval) 1370 return retval; 1371 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1372 return 0; 1373 case MTUNLOCK: 1374 retval = ide_set_media_lock(drive, disk, 0); 1375 if (retval) 1376 return retval; 1377 tape->door_locked = DOOR_UNLOCKED; 1378 return 0; 1379 default: 1380 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1381 mt_op); 1382 return -EIO; 1383 } 1384} 1385 1386/* 1387 * Our character device ioctls. General mtio.h magnetic io commands are 1388 * supported here, and not in the corresponding block interface. Our own 1389 * ide-tape ioctls are supported on both interfaces. 1390 */ 1391static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1392 unsigned int cmd, unsigned long arg) 1393{ 1394 struct ide_tape_obj *tape = file->private_data; 1395 ide_drive_t *drive = tape->drive; 1396 struct mtop mtop; 1397 struct mtget mtget; 1398 struct mtpos mtpos; 1399 int block_offset = 0, position = tape->first_frame; 1400 void __user *argp = (void __user *)arg; 1401 1402 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1403 1404 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1405 ide_tape_flush_merge_buffer(drive); 1406 idetape_flush_tape_buffers(drive); 1407 } 1408 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1409 block_offset = tape->valid / 1410 (tape->blk_size * tape->user_bs_factor); 1411 position = ide_tape_read_position(drive); 1412 if (position < 0) 1413 return -EIO; 1414 } 1415 switch (cmd) { 1416 case MTIOCTOP: 1417 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1418 return -EFAULT; 1419 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1420 case MTIOCGET: 1421 memset(&mtget, 0, sizeof(struct mtget)); 1422 mtget.mt_type = MT_ISSCSI2; 1423 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1424 mtget.mt_dsreg = 1425 ((tape->blk_size * tape->user_bs_factor) 1426 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1427 1428 if (tape->drv_write_prot) 1429 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1430 1431 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1432 return -EFAULT; 1433 return 0; 1434 case MTIOCPOS: 1435 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1436 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1437 return -EFAULT; 1438 return 0; 1439 default: 1440 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1441 ide_tape_discard_merge_buffer(drive, 1); 1442 return idetape_blkdev_ioctl(drive, cmd, arg); 1443 } 1444} 1445 1446/* 1447 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1448 * block size with the reported value. 1449 */ 1450static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1451{ 1452 idetape_tape_t *tape = drive->driver_data; 1453 struct ide_atapi_pc pc; 1454 u8 buf[12]; 1455 1456 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1457 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1458 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1459 if (tape->blk_size == 0) { 1460 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1461 "block size, assuming 32k\n"); 1462 tape->blk_size = 32768; 1463 } 1464 return; 1465 } 1466 tape->blk_size = (buf[4 + 5] << 16) + 1467 (buf[4 + 6] << 8) + 1468 buf[4 + 7]; 1469 tape->drv_write_prot = (buf[2] & 0x80) >> 7; 1470} 1471 1472static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1473{ 1474 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1475 ide_drive_t *drive; 1476 idetape_tape_t *tape; 1477 int retval; 1478 1479 if (i >= MAX_HWIFS * MAX_DRIVES) 1480 return -ENXIO; 1481 1482 lock_kernel(); 1483 tape = ide_tape_chrdev_get(i); 1484 if (!tape) { 1485 unlock_kernel(); 1486 return -ENXIO; 1487 } 1488 1489 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1490 1491 /* 1492 * We really want to do nonseekable_open(inode, filp); here, but some 1493 * versions of tar incorrectly call lseek on tapes and bail out if that 1494 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1495 */ 1496 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1497 1498 drive = tape->drive; 1499 1500 filp->private_data = tape; 1501 1502 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1503 retval = -EBUSY; 1504 goto out_put_tape; 1505 } 1506 1507 retval = idetape_wait_ready(drive, 60 * HZ); 1508 if (retval) { 1509 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1510 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1511 goto out_put_tape; 1512 } 1513 1514 ide_tape_read_position(drive); 1515 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1516 (void)idetape_rewind_tape(drive); 1517 1518 /* Read block size and write protect status from drive. */ 1519 ide_tape_get_bsize_from_bdesc(drive); 1520 1521 /* Set write protect flag if device is opened as read-only. */ 1522 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1523 tape->write_prot = 1; 1524 else 1525 tape->write_prot = tape->drv_write_prot; 1526 1527 /* Make sure drive isn't write protected if user wants to write. */ 1528 if (tape->write_prot) { 1529 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1530 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1531 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1532 retval = -EROFS; 1533 goto out_put_tape; 1534 } 1535 } 1536 1537 /* Lock the tape drive door so user can't eject. */ 1538 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1539 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1540 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1541 tape->door_locked = DOOR_LOCKED; 1542 } 1543 } 1544 unlock_kernel(); 1545 return 0; 1546 1547out_put_tape: 1548 ide_tape_put(tape); 1549 unlock_kernel(); 1550 return retval; 1551} 1552 1553static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1554{ 1555 idetape_tape_t *tape = drive->driver_data; 1556 1557 ide_tape_flush_merge_buffer(drive); 1558 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1559 if (tape->buf != NULL) { 1560 idetape_pad_zeros(drive, tape->blk_size * 1561 (tape->user_bs_factor - 1)); 1562 kfree(tape->buf); 1563 tape->buf = NULL; 1564 } 1565 idetape_write_filemark(drive); 1566 idetape_flush_tape_buffers(drive); 1567 idetape_flush_tape_buffers(drive); 1568} 1569 1570static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1571{ 1572 struct ide_tape_obj *tape = filp->private_data; 1573 ide_drive_t *drive = tape->drive; 1574 unsigned int minor = iminor(inode); 1575 1576 lock_kernel(); 1577 tape = drive->driver_data; 1578 1579 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1580 1581 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1582 idetape_write_release(drive, minor); 1583 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1584 if (minor < 128) 1585 ide_tape_discard_merge_buffer(drive, 1); 1586 } 1587 1588 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1589 (void) idetape_rewind_tape(drive); 1590 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1591 if (tape->door_locked == DOOR_LOCKED) { 1592 if (!ide_set_media_lock(drive, tape->disk, 0)) 1593 tape->door_locked = DOOR_UNLOCKED; 1594 } 1595 } 1596 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1597 ide_tape_put(tape); 1598 unlock_kernel(); 1599 return 0; 1600} 1601 1602static void idetape_get_inquiry_results(ide_drive_t *drive) 1603{ 1604 idetape_tape_t *tape = drive->driver_data; 1605 struct ide_atapi_pc pc; 1606 u8 pc_buf[256]; 1607 char fw_rev[4], vendor_id[8], product_id[16]; 1608 1609 idetape_create_inquiry_cmd(&pc); 1610 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { 1611 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1612 tape->name); 1613 return; 1614 } 1615 memcpy(vendor_id, &pc_buf[8], 8); 1616 memcpy(product_id, &pc_buf[16], 16); 1617 memcpy(fw_rev, &pc_buf[32], 4); 1618 1619 ide_fixstring(vendor_id, 8, 0); 1620 ide_fixstring(product_id, 16, 0); 1621 ide_fixstring(fw_rev, 4, 0); 1622 1623 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1624 drive->name, tape->name, vendor_id, product_id, fw_rev); 1625} 1626 1627/* 1628 * Ask the tape about its various parameters. In particular, we will adjust our 1629 * data transfer buffer size to the recommended value as returned by the tape. 1630 */ 1631static void idetape_get_mode_sense_results(ide_drive_t *drive) 1632{ 1633 idetape_tape_t *tape = drive->driver_data; 1634 struct ide_atapi_pc pc; 1635 u8 buf[24], *caps; 1636 u8 speed, max_speed; 1637 1638 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1639 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1640 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1641 " some default values\n"); 1642 tape->blk_size = 512; 1643 put_unaligned(52, (u16 *)&tape->caps[12]); 1644 put_unaligned(540, (u16 *)&tape->caps[14]); 1645 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1646 return; 1647 } 1648 caps = buf + 4 + buf[3]; 1649 1650 /* convert to host order and save for later use */ 1651 speed = be16_to_cpup((__be16 *)&caps[14]); 1652 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1653 1654 *(u16 *)&caps[8] = max_speed; 1655 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1656 *(u16 *)&caps[14] = speed; 1657 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1658 1659 if (!speed) { 1660 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1661 "(assuming 650KB/sec)\n", drive->name); 1662 *(u16 *)&caps[14] = 650; 1663 } 1664 if (!max_speed) { 1665 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1666 "(assuming 650KB/sec)\n", drive->name); 1667 *(u16 *)&caps[8] = 650; 1668 } 1669 1670 memcpy(&tape->caps, caps, 20); 1671 1672 /* device lacks locking support according to capabilities page */ 1673 if ((caps[6] & 1) == 0) 1674 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1675 1676 if (caps[7] & 0x02) 1677 tape->blk_size = 512; 1678 else if (caps[7] & 0x04) 1679 tape->blk_size = 1024; 1680} 1681 1682#ifdef CONFIG_IDE_PROC_FS 1683#define ide_tape_devset_get(name, field) \ 1684static int get_##name(ide_drive_t *drive) \ 1685{ \ 1686 idetape_tape_t *tape = drive->driver_data; \ 1687 return tape->field; \ 1688} 1689 1690#define ide_tape_devset_set(name, field) \ 1691static int set_##name(ide_drive_t *drive, int arg) \ 1692{ \ 1693 idetape_tape_t *tape = drive->driver_data; \ 1694 tape->field = arg; \ 1695 return 0; \ 1696} 1697 1698#define ide_tape_devset_rw_field(_name, _field) \ 1699ide_tape_devset_get(_name, _field) \ 1700ide_tape_devset_set(_name, _field) \ 1701IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1702 1703#define ide_tape_devset_r_field(_name, _field) \ 1704ide_tape_devset_get(_name, _field) \ 1705IDE_DEVSET(_name, 0, get_##_name, NULL) 1706 1707static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1708static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1709static int divf_buffer(ide_drive_t *drive) { return 2; } 1710static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1711 1712ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1713 1714ide_tape_devset_rw_field(debug_mask, debug_mask); 1715ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1716 1717ide_tape_devset_r_field(avg_speed, avg_speed); 1718ide_tape_devset_r_field(speed, caps[14]); 1719ide_tape_devset_r_field(buffer, caps[16]); 1720ide_tape_devset_r_field(buffer_size, buffer_size); 1721 1722static const struct ide_proc_devset idetape_settings[] = { 1723 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1724 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1725 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1726 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1727 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1728 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1729 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1730 mulf_tdsc, divf_tdsc), 1731 { NULL }, 1732}; 1733#endif 1734 1735/* 1736 * The function below is called to: 1737 * 1738 * 1. Initialize our various state variables. 1739 * 2. Ask the tape for its capabilities. 1740 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1741 * is chosen based on the recommendation which we received in step 2. 1742 * 1743 * Note that at this point ide.c already assigned us an irq, so that we can 1744 * queue requests here and wait for their completion. 1745 */ 1746static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1747{ 1748 unsigned long t; 1749 int speed; 1750 int buffer_size; 1751 u16 *ctl = (u16 *)&tape->caps[12]; 1752 1753 drive->pc_callback = ide_tape_callback; 1754 1755 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1756 1757 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1758 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1759 tape->name); 1760 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1761 } 1762 1763 /* Seagate Travan drives do not support DSC overlap. */ 1764 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1765 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1766 1767 tape->minor = minor; 1768 tape->name[0] = 'h'; 1769 tape->name[1] = 't'; 1770 tape->name[2] = '0' + minor; 1771 tape->chrdev_dir = IDETAPE_DIR_NONE; 1772 1773 idetape_get_inquiry_results(drive); 1774 idetape_get_mode_sense_results(drive); 1775 ide_tape_get_bsize_from_bdesc(drive); 1776 tape->user_bs_factor = 1; 1777 tape->buffer_size = *ctl * tape->blk_size; 1778 while (tape->buffer_size > 0xffff) { 1779 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1780 *ctl /= 2; 1781 tape->buffer_size = *ctl * tape->blk_size; 1782 } 1783 buffer_size = tape->buffer_size; 1784 1785 /* select the "best" DSC read/write polling freq */ 1786 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1787 1788 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1789 1790 /* 1791 * Ensure that the number we got makes sense; limit it within 1792 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1793 */ 1794 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1795 IDETAPE_DSC_RW_MAX); 1796 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1797 "%lums tDSC%s\n", 1798 drive->name, tape->name, *(u16 *)&tape->caps[14], 1799 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1800 tape->buffer_size / 1024, 1801 tape->best_dsc_rw_freq * 1000 / HZ, 1802 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1803 1804 ide_proc_register_driver(drive, tape->driver); 1805} 1806 1807static void ide_tape_remove(ide_drive_t *drive) 1808{ 1809 idetape_tape_t *tape = drive->driver_data; 1810 1811 ide_proc_unregister_driver(drive, tape->driver); 1812 device_del(&tape->dev); 1813 ide_unregister_region(tape->disk); 1814 1815 mutex_lock(&idetape_ref_mutex); 1816 put_device(&tape->dev); 1817 mutex_unlock(&idetape_ref_mutex); 1818} 1819 1820static void ide_tape_release(struct device *dev) 1821{ 1822 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1823 ide_drive_t *drive = tape->drive; 1824 struct gendisk *g = tape->disk; 1825 1826 BUG_ON(tape->valid); 1827 1828 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1829 drive->driver_data = NULL; 1830 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1831 device_destroy(idetape_sysfs_class, 1832 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1833 idetape_devs[tape->minor] = NULL; 1834 g->private_data = NULL; 1835 put_disk(g); 1836 kfree(tape); 1837} 1838 1839#ifdef CONFIG_IDE_PROC_FS 1840static int proc_idetape_read_name 1841 (char *page, char **start, off_t off, int count, int *eof, void *data) 1842{ 1843 ide_drive_t *drive = (ide_drive_t *) data; 1844 idetape_tape_t *tape = drive->driver_data; 1845 char *out = page; 1846 int len; 1847 1848 len = sprintf(out, "%s\n", tape->name); 1849 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1850} 1851 1852static ide_proc_entry_t idetape_proc[] = { 1853 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1854 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1855 { NULL, 0, NULL, NULL } 1856}; 1857 1858static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1859{ 1860 return idetape_proc; 1861} 1862 1863static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1864{ 1865 return idetape_settings; 1866} 1867#endif 1868 1869static int ide_tape_probe(ide_drive_t *); 1870 1871static struct ide_driver idetape_driver = { 1872 .gen_driver = { 1873 .owner = THIS_MODULE, 1874 .name = "ide-tape", 1875 .bus = &ide_bus_type, 1876 }, 1877 .probe = ide_tape_probe, 1878 .remove = ide_tape_remove, 1879 .version = IDETAPE_VERSION, 1880 .do_request = idetape_do_request, 1881#ifdef CONFIG_IDE_PROC_FS 1882 .proc_entries = ide_tape_proc_entries, 1883 .proc_devsets = ide_tape_proc_devsets, 1884#endif 1885}; 1886 1887/* Our character device supporting functions, passed to register_chrdev. */ 1888static const struct file_operations idetape_fops = { 1889 .owner = THIS_MODULE, 1890 .read = idetape_chrdev_read, 1891 .write = idetape_chrdev_write, 1892 .ioctl = idetape_chrdev_ioctl, 1893 .open = idetape_chrdev_open, 1894 .release = idetape_chrdev_release, 1895}; 1896 1897static int idetape_open(struct block_device *bdev, fmode_t mode) 1898{ 1899 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1900 1901 if (!tape) 1902 return -ENXIO; 1903 1904 return 0; 1905} 1906 1907static int idetape_release(struct gendisk *disk, fmode_t mode) 1908{ 1909 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1910 1911 ide_tape_put(tape); 1912 return 0; 1913} 1914 1915static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1916 unsigned int cmd, unsigned long arg) 1917{ 1918 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1919 ide_drive_t *drive = tape->drive; 1920 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1921 if (err == -EINVAL) 1922 err = idetape_blkdev_ioctl(drive, cmd, arg); 1923 return err; 1924} 1925 1926static struct block_device_operations idetape_block_ops = { 1927 .owner = THIS_MODULE, 1928 .open = idetape_open, 1929 .release = idetape_release, 1930 .locked_ioctl = idetape_ioctl, 1931}; 1932 1933static int ide_tape_probe(ide_drive_t *drive) 1934{ 1935 idetape_tape_t *tape; 1936 struct gendisk *g; 1937 int minor; 1938 1939 if (!strstr("ide-tape", drive->driver_req)) 1940 goto failed; 1941 1942 if (drive->media != ide_tape) 1943 goto failed; 1944 1945 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 1946 ide_check_atapi_device(drive, DRV_NAME) == 0) { 1947 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 1948 " the driver\n", drive->name); 1949 goto failed; 1950 } 1951 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 1952 if (tape == NULL) { 1953 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 1954 drive->name); 1955 goto failed; 1956 } 1957 1958 g = alloc_disk(1 << PARTN_BITS); 1959 if (!g) 1960 goto out_free_tape; 1961 1962 ide_init_disk(g, drive); 1963 1964 tape->dev.parent = &drive->gendev; 1965 tape->dev.release = ide_tape_release; 1966 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 1967 1968 if (device_register(&tape->dev)) 1969 goto out_free_disk; 1970 1971 tape->drive = drive; 1972 tape->driver = &idetape_driver; 1973 tape->disk = g; 1974 1975 g->private_data = &tape->driver; 1976 1977 drive->driver_data = tape; 1978 1979 mutex_lock(&idetape_ref_mutex); 1980 for (minor = 0; idetape_devs[minor]; minor++) 1981 ; 1982 idetape_devs[minor] = tape; 1983 mutex_unlock(&idetape_ref_mutex); 1984 1985 idetape_setup(drive, tape, minor); 1986 1987 device_create(idetape_sysfs_class, &drive->gendev, 1988 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 1989 device_create(idetape_sysfs_class, &drive->gendev, 1990 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 1991 "n%s", tape->name); 1992 1993 g->fops = &idetape_block_ops; 1994 ide_register_region(g); 1995 1996 return 0; 1997 1998out_free_disk: 1999 put_disk(g); 2000out_free_tape: 2001 kfree(tape); 2002failed: 2003 return -ENODEV; 2004} 2005 2006static void __exit idetape_exit(void) 2007{ 2008 driver_unregister(&idetape_driver.gen_driver); 2009 class_destroy(idetape_sysfs_class); 2010 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2011} 2012 2013static int __init idetape_init(void) 2014{ 2015 int error = 1; 2016 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2017 if (IS_ERR(idetape_sysfs_class)) { 2018 idetape_sysfs_class = NULL; 2019 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2020 error = -EBUSY; 2021 goto out; 2022 } 2023 2024 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2025 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2026 " interface\n"); 2027 error = -EBUSY; 2028 goto out_free_class; 2029 } 2030 2031 error = driver_register(&idetape_driver.gen_driver); 2032 if (error) 2033 goto out_free_driver; 2034 2035 return 0; 2036 2037out_free_driver: 2038 driver_unregister(&idetape_driver.gen_driver); 2039out_free_class: 2040 class_destroy(idetape_sysfs_class); 2041out: 2042 return error; 2043} 2044 2045MODULE_ALIAS("ide:*m-tape*"); 2046module_init(idetape_init); 2047module_exit(idetape_exit); 2048MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2049MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2050MODULE_LICENSE("GPL"); 2051