ide-tape.c revision 626542ca2277961aaa64855206574f8ca4f360e3
1/* 2 * IDE ATAPI streaming tape driver. 3 * 4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> 5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz 6 * 7 * This driver was constructed as a student project in the software laboratory 8 * of the faculty of electrical engineering in the Technion - Israel's 9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. 10 * 11 * It is hereby placed under the terms of the GNU general public license. 12 * (See linux/COPYING). 13 * 14 * For a historical changelog see 15 * Documentation/ide/ChangeLog.ide-tape.1995-2002 16 */ 17 18#define DRV_NAME "ide-tape" 19 20#define IDETAPE_VERSION "1.20" 21 22#include <linux/module.h> 23#include <linux/types.h> 24#include <linux/string.h> 25#include <linux/kernel.h> 26#include <linux/delay.h> 27#include <linux/timer.h> 28#include <linux/mm.h> 29#include <linux/interrupt.h> 30#include <linux/jiffies.h> 31#include <linux/major.h> 32#include <linux/errno.h> 33#include <linux/genhd.h> 34#include <linux/slab.h> 35#include <linux/pci.h> 36#include <linux/ide.h> 37#include <linux/smp_lock.h> 38#include <linux/completion.h> 39#include <linux/bitops.h> 40#include <linux/mutex.h> 41#include <scsi/scsi.h> 42 43#include <asm/byteorder.h> 44#include <linux/irq.h> 45#include <linux/uaccess.h> 46#include <linux/io.h> 47#include <asm/unaligned.h> 48#include <linux/mtio.h> 49 50enum { 51 /* output errors only */ 52 DBG_ERR = (1 << 0), 53 /* output all sense key/asc */ 54 DBG_SENSE = (1 << 1), 55 /* info regarding all chrdev-related procedures */ 56 DBG_CHRDEV = (1 << 2), 57 /* all remaining procedures */ 58 DBG_PROCS = (1 << 3), 59}; 60 61/* define to see debug info */ 62#define IDETAPE_DEBUG_LOG 0 63 64#if IDETAPE_DEBUG_LOG 65#define debug_log(lvl, fmt, args...) \ 66{ \ 67 if (tape->debug_mask & lvl) \ 68 printk(KERN_INFO "ide-tape: " fmt, ## args); \ 69} 70#else 71#define debug_log(lvl, fmt, args...) do {} while (0) 72#endif 73 74/**************************** Tunable parameters *****************************/ 75/* 76 * After each failed packet command we issue a request sense command and retry 77 * the packet command IDETAPE_MAX_PC_RETRIES times. 78 * 79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 80 */ 81#define IDETAPE_MAX_PC_RETRIES 3 82 83/* 84 * The following parameter is used to select the point in the internal tape fifo 85 * in which we will start to refill the buffer. Decreasing the following 86 * parameter will improve the system's latency and interactive response, while 87 * using a high value might improve system throughput. 88 */ 89#define IDETAPE_FIFO_THRESHOLD 2 90 91/* 92 * DSC polling parameters. 93 * 94 * Polling for DSC (a single bit in the status register) is a very important 95 * function in ide-tape. There are two cases in which we poll for DSC: 96 * 97 * 1. Before a read/write packet command, to ensure that we can transfer data 98 * from/to the tape's data buffers, without causing an actual media access. 99 * In case the tape is not ready yet, we take out our request from the device 100 * request queue, so that ide.c could service requests from the other device 101 * on the same interface in the meantime. 102 * 103 * 2. After the successful initialization of a "media access packet command", 104 * which is a command that can take a long time to complete (the interval can 105 * range from several seconds to even an hour). Again, we postpone our request 106 * in the middle to free the bus for the other device. The polling frequency 107 * here should be lower than the read/write frequency since those media access 108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 111 * 112 * We also set a timeout for the timer, in case something goes wrong. The 113 * timeout should be longer then the maximum execution time of a tape operation. 114 */ 115 116/* DSC timings. */ 117#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 118#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 119#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 120#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 121#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 122#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 123#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 124 125/*************************** End of tunable parameters ***********************/ 126 127/* tape directions */ 128enum { 129 IDETAPE_DIR_NONE = (1 << 0), 130 IDETAPE_DIR_READ = (1 << 1), 131 IDETAPE_DIR_WRITE = (1 << 2), 132}; 133 134/* Tape door status */ 135#define DOOR_UNLOCKED 0 136#define DOOR_LOCKED 1 137#define DOOR_EXPLICITLY_LOCKED 2 138 139/* Some defines for the SPACE command */ 140#define IDETAPE_SPACE_OVER_FILEMARK 1 141#define IDETAPE_SPACE_TO_EOD 3 142 143/* Some defines for the LOAD UNLOAD command */ 144#define IDETAPE_LU_LOAD_MASK 1 145#define IDETAPE_LU_RETENSION_MASK 2 146#define IDETAPE_LU_EOT_MASK 4 147 148/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 149#define IDETAPE_BLOCK_DESCRIPTOR 0 150#define IDETAPE_CAPABILITIES_PAGE 0x2a 151 152/* 153 * Most of our global data which we need to save even as we leave the driver due 154 * to an interrupt or a timer event is stored in the struct defined below. 155 */ 156typedef struct ide_tape_obj { 157 ide_drive_t *drive; 158 struct ide_driver *driver; 159 struct gendisk *disk; 160 struct device dev; 161 162 /* used by REQ_IDETAPE_{READ,WRITE} requests */ 163 struct ide_atapi_pc queued_pc; 164 165 /* 166 * DSC polling variables. 167 * 168 * While polling for DSC we use postponed_rq to postpone the current 169 * request so that ide.c will be able to service pending requests on the 170 * other device. Note that at most we will have only one DSC (usually 171 * data transfer) request in the device request queue. 172 */ 173 struct request *postponed_rq; 174 /* The time in which we started polling for DSC */ 175 unsigned long dsc_polling_start; 176 /* Timer used to poll for dsc */ 177 struct timer_list dsc_timer; 178 /* Read/Write dsc polling frequency */ 179 unsigned long best_dsc_rw_freq; 180 unsigned long dsc_poll_freq; 181 unsigned long dsc_timeout; 182 183 /* Read position information */ 184 u8 partition; 185 /* Current block */ 186 unsigned int first_frame; 187 188 /* Last error information */ 189 u8 sense_key, asc, ascq; 190 191 /* Character device operation */ 192 unsigned int minor; 193 /* device name */ 194 char name[4]; 195 /* Current character device data transfer direction */ 196 u8 chrdev_dir; 197 198 /* tape block size, usually 512 or 1024 bytes */ 199 unsigned short blk_size; 200 int user_bs_factor; 201 202 /* Copy of the tape's Capabilities and Mechanical Page */ 203 u8 caps[20]; 204 205 /* 206 * Active data transfer request parameters. 207 * 208 * At most, there is only one ide-tape originated data transfer request 209 * in the device request queue. This allows ide.c to easily service 210 * requests from the other device when we postpone our active request. 211 */ 212 213 /* Data buffer size chosen based on the tape's recommendation */ 214 int buffer_size; 215 /* Staging buffer of buffer_size bytes */ 216 void *buf; 217 /* The read/write cursor */ 218 void *cur; 219 /* The number of valid bytes in buf */ 220 size_t valid; 221 222 /* Measures average tape speed */ 223 unsigned long avg_time; 224 int avg_size; 225 int avg_speed; 226 227 /* the door is currently locked */ 228 int door_locked; 229 /* the tape hardware is write protected */ 230 char drv_write_prot; 231 /* the tape is write protected (hardware or opened as read-only) */ 232 char write_prot; 233 234 u32 debug_mask; 235} idetape_tape_t; 236 237static DEFINE_MUTEX(idetape_ref_mutex); 238 239static struct class *idetape_sysfs_class; 240 241static void ide_tape_release(struct device *); 242 243static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 244{ 245 struct ide_tape_obj *tape = NULL; 246 247 mutex_lock(&idetape_ref_mutex); 248 tape = ide_drv_g(disk, ide_tape_obj); 249 if (tape) { 250 if (ide_device_get(tape->drive)) 251 tape = NULL; 252 else 253 get_device(&tape->dev); 254 } 255 mutex_unlock(&idetape_ref_mutex); 256 return tape; 257} 258 259static void ide_tape_put(struct ide_tape_obj *tape) 260{ 261 ide_drive_t *drive = tape->drive; 262 263 mutex_lock(&idetape_ref_mutex); 264 put_device(&tape->dev); 265 ide_device_put(drive); 266 mutex_unlock(&idetape_ref_mutex); 267} 268 269/* 270 * The variables below are used for the character device interface. Additional 271 * state variables are defined in our ide_drive_t structure. 272 */ 273static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 274 275static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 276{ 277 struct ide_tape_obj *tape = NULL; 278 279 mutex_lock(&idetape_ref_mutex); 280 tape = idetape_devs[i]; 281 if (tape) 282 get_device(&tape->dev); 283 mutex_unlock(&idetape_ref_mutex); 284 return tape; 285} 286 287/* 288 * called on each failed packet command retry to analyze the request sense. We 289 * currently do not utilize this information. 290 */ 291static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) 292{ 293 idetape_tape_t *tape = drive->driver_data; 294 struct ide_atapi_pc *pc = drive->failed_pc; 295 296 tape->sense_key = sense[2] & 0xF; 297 tape->asc = sense[12]; 298 tape->ascq = sense[13]; 299 300 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", 301 pc->c[0], tape->sense_key, tape->asc, tape->ascq); 302 303 /* Correct pc->xferred by asking the tape. */ 304 if (pc->flags & PC_FLAG_DMA_ERROR) 305 pc->xferred = pc->req_xfer - 306 tape->blk_size * 307 get_unaligned_be32(&sense[3]); 308 309 /* 310 * If error was the result of a zero-length read or write command, 311 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 312 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 313 */ 314 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 315 /* length == 0 */ 316 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 317 if (tape->sense_key == 5) { 318 /* don't report an error, everything's ok */ 319 pc->error = 0; 320 /* don't retry read/write */ 321 pc->flags |= PC_FLAG_ABORT; 322 } 323 } 324 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 325 pc->error = IDE_DRV_ERROR_FILEMARK; 326 pc->flags |= PC_FLAG_ABORT; 327 } 328 if (pc->c[0] == WRITE_6) { 329 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 330 && tape->asc == 0x0 && tape->ascq == 0x2)) { 331 pc->error = IDE_DRV_ERROR_EOD; 332 pc->flags |= PC_FLAG_ABORT; 333 } 334 } 335 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 336 if (tape->sense_key == 8) { 337 pc->error = IDE_DRV_ERROR_EOD; 338 pc->flags |= PC_FLAG_ABORT; 339 } 340 if (!(pc->flags & PC_FLAG_ABORT) && 341 pc->xferred) 342 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 343 } 344} 345 346static void ide_tape_handle_dsc(ide_drive_t *); 347 348static int ide_tape_callback(ide_drive_t *drive, int dsc) 349{ 350 idetape_tape_t *tape = drive->driver_data; 351 struct ide_atapi_pc *pc = drive->pc; 352 struct request *rq = drive->hwif->rq; 353 int uptodate = pc->error ? 0 : 1; 354 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; 355 356 debug_log(DBG_PROCS, "Enter %s\n", __func__); 357 358 if (dsc) 359 ide_tape_handle_dsc(drive); 360 361 if (drive->failed_pc == pc) 362 drive->failed_pc = NULL; 363 364 if (pc->c[0] == REQUEST_SENSE) { 365 if (uptodate) 366 idetape_analyze_error(drive, pc->buf); 367 else 368 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 369 "itself - Aborting request!\n"); 370 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 371 int blocks = pc->xferred / tape->blk_size; 372 373 tape->avg_size += blocks * tape->blk_size; 374 375 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 376 tape->avg_speed = tape->avg_size * HZ / 377 (jiffies - tape->avg_time) / 1024; 378 tape->avg_size = 0; 379 tape->avg_time = jiffies; 380 } 381 382 tape->first_frame += blocks; 383 rq->data_len -= blocks * tape->blk_size; 384 385 if (pc->error) { 386 uptodate = 0; 387 err = pc->error; 388 } 389 } else if (pc->c[0] == READ_POSITION && uptodate) { 390 u8 *readpos = pc->buf; 391 392 debug_log(DBG_SENSE, "BOP - %s\n", 393 (readpos[0] & 0x80) ? "Yes" : "No"); 394 debug_log(DBG_SENSE, "EOP - %s\n", 395 (readpos[0] & 0x40) ? "Yes" : "No"); 396 397 if (readpos[0] & 0x4) { 398 printk(KERN_INFO "ide-tape: Block location is unknown" 399 "to the tape\n"); 400 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 401 uptodate = 0; 402 err = IDE_DRV_ERROR_GENERAL; 403 } else { 404 debug_log(DBG_SENSE, "Block Location - %u\n", 405 be32_to_cpup((__be32 *)&readpos[4])); 406 407 tape->partition = readpos[1]; 408 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); 409 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 410 } 411 } 412 413 rq->errors = err; 414 415 return uptodate; 416} 417 418/* 419 * Postpone the current request so that ide.c will be able to service requests 420 * from another device on the same port while we are polling for DSC. 421 */ 422static void idetape_postpone_request(ide_drive_t *drive) 423{ 424 idetape_tape_t *tape = drive->driver_data; 425 426 debug_log(DBG_PROCS, "Enter %s\n", __func__); 427 428 tape->postponed_rq = drive->hwif->rq; 429 430 ide_stall_queue(drive, tape->dsc_poll_freq); 431} 432 433static void ide_tape_handle_dsc(ide_drive_t *drive) 434{ 435 idetape_tape_t *tape = drive->driver_data; 436 437 /* Media access command */ 438 tape->dsc_polling_start = jiffies; 439 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 440 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 441 /* Allow ide.c to handle other requests */ 442 idetape_postpone_request(drive); 443} 444 445/* 446 * Packet Command Interface 447 * 448 * The current Packet Command is available in drive->pc, and will not change 449 * until we finish handling it. Each packet command is associated with a 450 * callback function that will be called when the command is finished. 451 * 452 * The handling will be done in three stages: 453 * 454 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set 455 * the interrupt handler to ide_pc_intr. 456 * 457 * 2. On each interrupt, ide_pc_intr will be called. This step will be 458 * repeated until the device signals us that no more interrupts will be issued. 459 * 460 * 3. ATAPI Tape media access commands have immediate status with a delayed 461 * process. In case of a successful initiation of a media access packet command, 462 * the DSC bit will be set when the actual execution of the command is finished. 463 * Since the tape drive will not issue an interrupt, we have to poll for this 464 * event. In this case, we define the request as "low priority request" by 465 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 466 * exit the driver. 467 * 468 * ide.c will then give higher priority to requests which originate from the 469 * other device, until will change rq_status to RQ_ACTIVE. 470 * 471 * 4. When the packet command is finished, it will be checked for errors. 472 * 473 * 5. In case an error was found, we queue a request sense packet command in 474 * front of the request queue and retry the operation up to 475 * IDETAPE_MAX_PC_RETRIES times. 476 * 477 * 6. In case no error was found, or we decided to give up and not to retry 478 * again, the callback function will be called and then we will handle the next 479 * request. 480 */ 481 482static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, 483 struct ide_cmd *cmd, 484 struct ide_atapi_pc *pc) 485{ 486 idetape_tape_t *tape = drive->driver_data; 487 488 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 489 drive->failed_pc = pc; 490 491 /* Set the current packet command */ 492 drive->pc = pc; 493 494 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 495 (pc->flags & PC_FLAG_ABORT)) { 496 unsigned int done = blk_rq_bytes(drive->hwif->rq); 497 498 /* 499 * We will "abort" retrying a packet command in case legitimate 500 * error code was received (crossing a filemark, or end of the 501 * media, for example). 502 */ 503 if (!(pc->flags & PC_FLAG_ABORT)) { 504 if (!(pc->c[0] == TEST_UNIT_READY && 505 tape->sense_key == 2 && tape->asc == 4 && 506 (tape->ascq == 1 || tape->ascq == 8))) { 507 printk(KERN_ERR "ide-tape: %s: I/O error, " 508 "pc = %2x, key = %2x, " 509 "asc = %2x, ascq = %2x\n", 510 tape->name, pc->c[0], 511 tape->sense_key, tape->asc, 512 tape->ascq); 513 } 514 /* Giving up */ 515 pc->error = IDE_DRV_ERROR_GENERAL; 516 } 517 518 drive->failed_pc = NULL; 519 drive->pc_callback(drive, 0); 520 ide_complete_rq(drive, -EIO, done); 521 return ide_stopped; 522 } 523 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); 524 525 pc->retries++; 526 527 return ide_issue_pc(drive, cmd); 528} 529 530/* A mode sense command is used to "sense" tape parameters. */ 531static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 532{ 533 ide_init_pc(pc); 534 pc->c[0] = MODE_SENSE; 535 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 536 /* DBD = 1 - Don't return block descriptors */ 537 pc->c[1] = 8; 538 pc->c[2] = page_code; 539 /* 540 * Changed pc->c[3] to 0 (255 will at best return unused info). 541 * 542 * For SCSI this byte is defined as subpage instead of high byte 543 * of length and some IDE drives seem to interpret it this way 544 * and return an error when 255 is used. 545 */ 546 pc->c[3] = 0; 547 /* We will just discard data in that case */ 548 pc->c[4] = 255; 549 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 550 pc->req_xfer = 12; 551 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 552 pc->req_xfer = 24; 553 else 554 pc->req_xfer = 50; 555} 556 557static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 558{ 559 ide_hwif_t *hwif = drive->hwif; 560 idetape_tape_t *tape = drive->driver_data; 561 struct ide_atapi_pc *pc = drive->pc; 562 u8 stat; 563 564 stat = hwif->tp_ops->read_status(hwif); 565 566 if (stat & ATA_DSC) { 567 if (stat & ATA_ERR) { 568 /* Error detected */ 569 if (pc->c[0] != TEST_UNIT_READY) 570 printk(KERN_ERR "ide-tape: %s: I/O error, ", 571 tape->name); 572 /* Retry operation */ 573 ide_retry_pc(drive); 574 return ide_stopped; 575 } 576 pc->error = 0; 577 } else { 578 pc->error = IDE_DRV_ERROR_GENERAL; 579 drive->failed_pc = NULL; 580 } 581 drive->pc_callback(drive, 0); 582 return ide_stopped; 583} 584 585static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 586 struct ide_atapi_pc *pc, struct request *rq, 587 u8 opcode) 588{ 589 unsigned int length = rq->nr_sectors; 590 591 ide_init_pc(pc); 592 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 593 pc->c[1] = 1; 594 pc->buf = NULL; 595 pc->buf_size = length * tape->blk_size; 596 pc->req_xfer = pc->buf_size; 597 if (pc->req_xfer == tape->buffer_size) 598 pc->flags |= PC_FLAG_DMA_OK; 599 600 if (opcode == READ_6) 601 pc->c[0] = READ_6; 602 else if (opcode == WRITE_6) { 603 pc->c[0] = WRITE_6; 604 pc->flags |= PC_FLAG_WRITING; 605 } 606 607 memcpy(rq->cmd, pc->c, 12); 608} 609 610static ide_startstop_t idetape_do_request(ide_drive_t *drive, 611 struct request *rq, sector_t block) 612{ 613 ide_hwif_t *hwif = drive->hwif; 614 idetape_tape_t *tape = drive->driver_data; 615 struct ide_atapi_pc *pc = NULL; 616 struct request *postponed_rq = tape->postponed_rq; 617 struct ide_cmd cmd; 618 u8 stat; 619 620 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n", 621 (unsigned long long)rq->sector, rq->nr_sectors); 622 623 if (!(blk_special_request(rq) || blk_sense_request(rq))) { 624 /* We do not support buffer cache originated requests. */ 625 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 626 "request queue (%d)\n", drive->name, rq->cmd_type); 627 if (blk_fs_request(rq) == 0 && rq->errors == 0) 628 rq->errors = -EIO; 629 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); 630 return ide_stopped; 631 } 632 633 /* Retry a failed packet command */ 634 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 635 pc = drive->failed_pc; 636 goto out; 637 } 638 639 if (postponed_rq != NULL) 640 if (rq != postponed_rq) { 641 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 642 "Two DSC requests were queued\n"); 643 drive->failed_pc = NULL; 644 rq->errors = 0; 645 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 646 return ide_stopped; 647 } 648 649 tape->postponed_rq = NULL; 650 651 /* 652 * If the tape is still busy, postpone our request and service 653 * the other device meanwhile. 654 */ 655 stat = hwif->tp_ops->read_status(hwif); 656 657 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 658 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 659 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 660 661 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 662 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 663 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 664 } 665 666 if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && 667 !(stat & ATA_DSC)) { 668 if (postponed_rq == NULL) { 669 tape->dsc_polling_start = jiffies; 670 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 671 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 672 } else if (time_after(jiffies, tape->dsc_timeout)) { 673 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 674 tape->name); 675 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 676 idetape_media_access_finished(drive); 677 return ide_stopped; 678 } else { 679 return ide_do_reset(drive); 680 } 681 } else if (time_after(jiffies, 682 tape->dsc_polling_start + 683 IDETAPE_DSC_MA_THRESHOLD)) 684 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 685 idetape_postpone_request(drive); 686 return ide_stopped; 687 } else 688 drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; 689 690 if (rq->cmd[13] & REQ_IDETAPE_READ) { 691 pc = &tape->queued_pc; 692 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 693 goto out; 694 } 695 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 696 pc = &tape->queued_pc; 697 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 698 goto out; 699 } 700 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 701 pc = (struct ide_atapi_pc *)rq->special; 702 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 703 rq->cmd[13] |= REQ_IDETAPE_PC2; 704 goto out; 705 } 706 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 707 idetape_media_access_finished(drive); 708 return ide_stopped; 709 } 710 BUG(); 711 712out: 713 /* prepare sense request for this command */ 714 ide_prep_sense(drive, rq); 715 716 memset(&cmd, 0, sizeof(cmd)); 717 718 if (rq_data_dir(rq)) 719 cmd.tf_flags |= IDE_TFLAG_WRITE; 720 721 cmd.rq = rq; 722 723 ide_init_sg_cmd(&cmd, pc->req_xfer); 724 ide_map_sg(drive, &cmd); 725 726 return ide_tape_issue_pc(drive, &cmd, pc); 727} 728 729/* 730 * Write a filemark if write_filemark=1. Flush the device buffers without 731 * writing a filemark otherwise. 732 */ 733static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 734 struct ide_atapi_pc *pc, int write_filemark) 735{ 736 ide_init_pc(pc); 737 pc->c[0] = WRITE_FILEMARKS; 738 pc->c[4] = write_filemark; 739 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 740} 741 742static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 743{ 744 idetape_tape_t *tape = drive->driver_data; 745 struct gendisk *disk = tape->disk; 746 int load_attempted = 0; 747 748 /* Wait for the tape to become ready */ 749 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 750 timeout += jiffies; 751 while (time_before(jiffies, timeout)) { 752 if (ide_do_test_unit_ready(drive, disk) == 0) 753 return 0; 754 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 755 || (tape->asc == 0x3A)) { 756 /* no media */ 757 if (load_attempted) 758 return -ENOMEDIUM; 759 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 760 load_attempted = 1; 761 /* not about to be ready */ 762 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 763 (tape->ascq == 1 || tape->ascq == 8))) 764 return -EIO; 765 msleep(100); 766 } 767 return -EIO; 768} 769 770static int idetape_flush_tape_buffers(ide_drive_t *drive) 771{ 772 struct ide_tape_obj *tape = drive->driver_data; 773 struct ide_atapi_pc pc; 774 int rc; 775 776 idetape_create_write_filemark_cmd(drive, &pc, 0); 777 rc = ide_queue_pc_tail(drive, tape->disk, &pc); 778 if (rc) 779 return rc; 780 idetape_wait_ready(drive, 60 * 5 * HZ); 781 return 0; 782} 783 784static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 785{ 786 ide_init_pc(pc); 787 pc->c[0] = READ_POSITION; 788 pc->req_xfer = 20; 789} 790 791static int idetape_read_position(ide_drive_t *drive) 792{ 793 idetape_tape_t *tape = drive->driver_data; 794 struct ide_atapi_pc pc; 795 int position; 796 797 debug_log(DBG_PROCS, "Enter %s\n", __func__); 798 799 idetape_create_read_position_cmd(&pc); 800 if (ide_queue_pc_tail(drive, tape->disk, &pc)) 801 return -1; 802 position = tape->first_frame; 803 return position; 804} 805 806static void idetape_create_locate_cmd(ide_drive_t *drive, 807 struct ide_atapi_pc *pc, 808 unsigned int block, u8 partition, int skip) 809{ 810 ide_init_pc(pc); 811 pc->c[0] = POSITION_TO_ELEMENT; 812 pc->c[1] = 2; 813 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 814 pc->c[8] = partition; 815 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 816} 817 818static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 819{ 820 idetape_tape_t *tape = drive->driver_data; 821 822 if (tape->chrdev_dir != IDETAPE_DIR_READ) 823 return; 824 825 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 826 tape->valid = 0; 827 if (tape->buf != NULL) { 828 kfree(tape->buf); 829 tape->buf = NULL; 830 } 831 832 tape->chrdev_dir = IDETAPE_DIR_NONE; 833} 834 835/* 836 * Position the tape to the requested block using the LOCATE packet command. 837 * A READ POSITION command is then issued to check where we are positioned. Like 838 * all higher level operations, we queue the commands at the tail of the request 839 * queue and wait for their completion. 840 */ 841static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 842 u8 partition, int skip) 843{ 844 idetape_tape_t *tape = drive->driver_data; 845 struct gendisk *disk = tape->disk; 846 int retval; 847 struct ide_atapi_pc pc; 848 849 if (tape->chrdev_dir == IDETAPE_DIR_READ) 850 __ide_tape_discard_merge_buffer(drive); 851 idetape_wait_ready(drive, 60 * 5 * HZ); 852 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 853 retval = ide_queue_pc_tail(drive, disk, &pc); 854 if (retval) 855 return (retval); 856 857 idetape_create_read_position_cmd(&pc); 858 return ide_queue_pc_tail(drive, disk, &pc); 859} 860 861static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 862 int restore_position) 863{ 864 idetape_tape_t *tape = drive->driver_data; 865 int seek, position; 866 867 __ide_tape_discard_merge_buffer(drive); 868 if (restore_position) { 869 position = idetape_read_position(drive); 870 seek = position > 0 ? position : 0; 871 if (idetape_position_tape(drive, seek, 0, 0)) { 872 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 873 " %s\n", tape->name, __func__); 874 return; 875 } 876 } 877} 878 879/* 880 * Generate a read/write request for the block device interface and wait for it 881 * to be serviced. 882 */ 883static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 884{ 885 idetape_tape_t *tape = drive->driver_data; 886 struct request *rq; 887 int ret; 888 889 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 890 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 891 BUG_ON(size < 0 || size % tape->blk_size); 892 893 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 894 rq->cmd_type = REQ_TYPE_SPECIAL; 895 rq->cmd[13] = cmd; 896 rq->rq_disk = tape->disk; 897 rq->sector = tape->first_frame; 898 899 if (size) { 900 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 901 __GFP_WAIT); 902 if (ret) 903 goto out_put; 904 } 905 906 blk_execute_rq(drive->queue, tape->disk, rq, 0); 907 908 /* calculate the number of transferred bytes and update buffer state */ 909 size -= rq->data_len; 910 tape->cur = tape->buf; 911 if (cmd == REQ_IDETAPE_READ) 912 tape->valid = size; 913 else 914 tape->valid = 0; 915 916 ret = size; 917 if (rq->errors == IDE_DRV_ERROR_GENERAL) 918 ret = -EIO; 919out_put: 920 blk_put_request(rq); 921 return ret; 922} 923 924static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 925{ 926 ide_init_pc(pc); 927 pc->c[0] = INQUIRY; 928 pc->c[4] = 254; 929 pc->req_xfer = 254; 930} 931 932static void idetape_create_rewind_cmd(ide_drive_t *drive, 933 struct ide_atapi_pc *pc) 934{ 935 ide_init_pc(pc); 936 pc->c[0] = REZERO_UNIT; 937 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 938} 939 940static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 941{ 942 ide_init_pc(pc); 943 pc->c[0] = ERASE; 944 pc->c[1] = 1; 945 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 946} 947 948static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 949{ 950 ide_init_pc(pc); 951 pc->c[0] = SPACE; 952 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 953 pc->c[1] = cmd; 954 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 955} 956 957static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 958{ 959 idetape_tape_t *tape = drive->driver_data; 960 961 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 962 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 963 " but we are not writing.\n"); 964 return; 965 } 966 if (tape->buf) { 967 size_t aligned = roundup(tape->valid, tape->blk_size); 968 969 memset(tape->cur, 0, aligned - tape->valid); 970 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); 971 kfree(tape->buf); 972 tape->buf = NULL; 973 } 974 tape->chrdev_dir = IDETAPE_DIR_NONE; 975} 976 977static int idetape_init_rw(ide_drive_t *drive, int dir) 978{ 979 idetape_tape_t *tape = drive->driver_data; 980 int rc; 981 982 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 983 984 if (tape->chrdev_dir == dir) 985 return 0; 986 987 if (tape->chrdev_dir == IDETAPE_DIR_READ) 988 ide_tape_discard_merge_buffer(drive, 1); 989 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 990 ide_tape_flush_merge_buffer(drive); 991 idetape_flush_tape_buffers(drive); 992 } 993 994 if (tape->buf || tape->valid) { 995 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 996 tape->valid = 0; 997 } 998 999 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1000 if (!tape->buf) 1001 return -ENOMEM; 1002 tape->chrdev_dir = dir; 1003 tape->cur = tape->buf; 1004 1005 /* 1006 * Issue a 0 rw command to ensure that DSC handshake is 1007 * switched from completion mode to buffer available mode. No 1008 * point in issuing this if DSC overlap isn't supported, some 1009 * drives (Seagate STT3401A) will return an error. 1010 */ 1011 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1012 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 1013 : REQ_IDETAPE_WRITE; 1014 1015 rc = idetape_queue_rw_tail(drive, cmd, 0); 1016 if (rc < 0) { 1017 kfree(tape->buf); 1018 tape->buf = NULL; 1019 tape->chrdev_dir = IDETAPE_DIR_NONE; 1020 return rc; 1021 } 1022 } 1023 1024 return 0; 1025} 1026 1027static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1028{ 1029 idetape_tape_t *tape = drive->driver_data; 1030 1031 memset(tape->buf, 0, tape->buffer_size); 1032 1033 while (bcount) { 1034 unsigned int count = min(tape->buffer_size, bcount); 1035 1036 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1037 bcount -= count; 1038 } 1039} 1040 1041/* 1042 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1043 * currently support only one partition. 1044 */ 1045static int idetape_rewind_tape(ide_drive_t *drive) 1046{ 1047 struct ide_tape_obj *tape = drive->driver_data; 1048 struct gendisk *disk = tape->disk; 1049 int retval; 1050 struct ide_atapi_pc pc; 1051 1052 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1053 1054 idetape_create_rewind_cmd(drive, &pc); 1055 retval = ide_queue_pc_tail(drive, disk, &pc); 1056 if (retval) 1057 return retval; 1058 1059 idetape_create_read_position_cmd(&pc); 1060 retval = ide_queue_pc_tail(drive, disk, &pc); 1061 if (retval) 1062 return retval; 1063 return 0; 1064} 1065 1066/* mtio.h compatible commands should be issued to the chrdev interface. */ 1067static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1068 unsigned long arg) 1069{ 1070 idetape_tape_t *tape = drive->driver_data; 1071 void __user *argp = (void __user *)arg; 1072 1073 struct idetape_config { 1074 int dsc_rw_frequency; 1075 int dsc_media_access_frequency; 1076 int nr_stages; 1077 } config; 1078 1079 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1080 1081 switch (cmd) { 1082 case 0x0340: 1083 if (copy_from_user(&config, argp, sizeof(config))) 1084 return -EFAULT; 1085 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1086 break; 1087 case 0x0350: 1088 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1089 config.nr_stages = 1; 1090 if (copy_to_user(argp, &config, sizeof(config))) 1091 return -EFAULT; 1092 break; 1093 default: 1094 return -EIO; 1095 } 1096 return 0; 1097} 1098 1099static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1100 int mt_count) 1101{ 1102 idetape_tape_t *tape = drive->driver_data; 1103 struct gendisk *disk = tape->disk; 1104 struct ide_atapi_pc pc; 1105 int retval, count = 0; 1106 int sprev = !!(tape->caps[4] & 0x20); 1107 1108 if (mt_count == 0) 1109 return 0; 1110 if (MTBSF == mt_op || MTBSFM == mt_op) { 1111 if (!sprev) 1112 return -EIO; 1113 mt_count = -mt_count; 1114 } 1115 1116 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1117 tape->valid = 0; 1118 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1119 ++count; 1120 ide_tape_discard_merge_buffer(drive, 0); 1121 } 1122 1123 switch (mt_op) { 1124 case MTFSF: 1125 case MTBSF: 1126 idetape_create_space_cmd(&pc, mt_count - count, 1127 IDETAPE_SPACE_OVER_FILEMARK); 1128 return ide_queue_pc_tail(drive, disk, &pc); 1129 case MTFSFM: 1130 case MTBSFM: 1131 if (!sprev) 1132 return -EIO; 1133 retval = idetape_space_over_filemarks(drive, MTFSF, 1134 mt_count - count); 1135 if (retval) 1136 return retval; 1137 count = (MTBSFM == mt_op ? 1 : -1); 1138 return idetape_space_over_filemarks(drive, MTFSF, count); 1139 default: 1140 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1141 mt_op); 1142 return -EIO; 1143 } 1144} 1145 1146/* 1147 * Our character device read / write functions. 1148 * 1149 * The tape is optimized to maximize throughput when it is transferring an 1150 * integral number of the "continuous transfer limit", which is a parameter of 1151 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1152 * 1153 * As of version 1.3 of the driver, the character device provides an abstract 1154 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1155 * same backup/restore procedure is supported. The driver will internally 1156 * convert the requests to the recommended transfer unit, so that an unmatch 1157 * between the user's block size to the recommended size will only result in a 1158 * (slightly) increased driver overhead, but will no longer hit performance. 1159 * This is not applicable to Onstream. 1160 */ 1161static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1162 size_t count, loff_t *ppos) 1163{ 1164 struct ide_tape_obj *tape = file->private_data; 1165 ide_drive_t *drive = tape->drive; 1166 size_t done = 0; 1167 ssize_t ret = 0; 1168 int rc; 1169 1170 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1171 1172 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1173 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1174 if (count > tape->blk_size && 1175 (count % tape->blk_size) == 0) 1176 tape->user_bs_factor = count / tape->blk_size; 1177 } 1178 1179 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1180 if (rc < 0) 1181 return rc; 1182 1183 while (done < count) { 1184 size_t todo; 1185 1186 /* refill if staging buffer is empty */ 1187 if (!tape->valid) { 1188 /* If we are at a filemark, nothing more to read */ 1189 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1190 break; 1191 /* read */ 1192 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1193 tape->buffer_size) <= 0) 1194 break; 1195 } 1196 1197 /* copy out */ 1198 todo = min_t(size_t, count - done, tape->valid); 1199 if (copy_to_user(buf + done, tape->cur, todo)) 1200 ret = -EFAULT; 1201 1202 tape->cur += todo; 1203 tape->valid -= todo; 1204 done += todo; 1205 } 1206 1207 if (!done && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1208 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1209 1210 idetape_space_over_filemarks(drive, MTFSF, 1); 1211 return 0; 1212 } 1213 1214 return ret ? ret : done; 1215} 1216 1217static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1218 size_t count, loff_t *ppos) 1219{ 1220 struct ide_tape_obj *tape = file->private_data; 1221 ide_drive_t *drive = tape->drive; 1222 size_t done = 0; 1223 ssize_t ret = 0; 1224 int rc; 1225 1226 /* The drive is write protected. */ 1227 if (tape->write_prot) 1228 return -EACCES; 1229 1230 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1231 1232 /* Initialize write operation */ 1233 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1234 if (rc < 0) 1235 return rc; 1236 1237 while (done < count) { 1238 size_t todo; 1239 1240 /* flush if staging buffer is full */ 1241 if (tape->valid == tape->buffer_size && 1242 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1243 tape->buffer_size) <= 0) 1244 return rc; 1245 1246 /* copy in */ 1247 todo = min_t(size_t, count - done, 1248 tape->buffer_size - tape->valid); 1249 if (copy_from_user(tape->cur, buf + done, todo)) 1250 ret = -EFAULT; 1251 1252 tape->cur += todo; 1253 tape->valid += todo; 1254 done += todo; 1255 } 1256 1257 return ret ? ret : done; 1258} 1259 1260static int idetape_write_filemark(ide_drive_t *drive) 1261{ 1262 struct ide_tape_obj *tape = drive->driver_data; 1263 struct ide_atapi_pc pc; 1264 1265 /* Write a filemark */ 1266 idetape_create_write_filemark_cmd(drive, &pc, 1); 1267 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1268 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1269 return -EIO; 1270 } 1271 return 0; 1272} 1273 1274/* 1275 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1276 * requested. 1277 * 1278 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1279 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1280 * usually not supported. 1281 * 1282 * The following commands are currently not supported: 1283 * 1284 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1285 * MT_ST_WRITE_THRESHOLD. 1286 */ 1287static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1288{ 1289 idetape_tape_t *tape = drive->driver_data; 1290 struct gendisk *disk = tape->disk; 1291 struct ide_atapi_pc pc; 1292 int i, retval; 1293 1294 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1295 mt_op, mt_count); 1296 1297 switch (mt_op) { 1298 case MTFSF: 1299 case MTFSFM: 1300 case MTBSF: 1301 case MTBSFM: 1302 if (!mt_count) 1303 return 0; 1304 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1305 default: 1306 break; 1307 } 1308 1309 switch (mt_op) { 1310 case MTWEOF: 1311 if (tape->write_prot) 1312 return -EACCES; 1313 ide_tape_discard_merge_buffer(drive, 1); 1314 for (i = 0; i < mt_count; i++) { 1315 retval = idetape_write_filemark(drive); 1316 if (retval) 1317 return retval; 1318 } 1319 return 0; 1320 case MTREW: 1321 ide_tape_discard_merge_buffer(drive, 0); 1322 if (idetape_rewind_tape(drive)) 1323 return -EIO; 1324 return 0; 1325 case MTLOAD: 1326 ide_tape_discard_merge_buffer(drive, 0); 1327 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1328 case MTUNLOAD: 1329 case MTOFFL: 1330 /* 1331 * If door is locked, attempt to unlock before 1332 * attempting to eject. 1333 */ 1334 if (tape->door_locked) { 1335 if (!ide_set_media_lock(drive, disk, 0)) 1336 tape->door_locked = DOOR_UNLOCKED; 1337 } 1338 ide_tape_discard_merge_buffer(drive, 0); 1339 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1340 if (!retval) 1341 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1342 return retval; 1343 case MTNOP: 1344 ide_tape_discard_merge_buffer(drive, 0); 1345 return idetape_flush_tape_buffers(drive); 1346 case MTRETEN: 1347 ide_tape_discard_merge_buffer(drive, 0); 1348 return ide_do_start_stop(drive, disk, 1349 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1350 case MTEOM: 1351 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1352 return ide_queue_pc_tail(drive, disk, &pc); 1353 case MTERASE: 1354 (void)idetape_rewind_tape(drive); 1355 idetape_create_erase_cmd(&pc); 1356 return ide_queue_pc_tail(drive, disk, &pc); 1357 case MTSETBLK: 1358 if (mt_count) { 1359 if (mt_count < tape->blk_size || 1360 mt_count % tape->blk_size) 1361 return -EIO; 1362 tape->user_bs_factor = mt_count / tape->blk_size; 1363 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1364 } else 1365 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1366 return 0; 1367 case MTSEEK: 1368 ide_tape_discard_merge_buffer(drive, 0); 1369 return idetape_position_tape(drive, 1370 mt_count * tape->user_bs_factor, tape->partition, 0); 1371 case MTSETPART: 1372 ide_tape_discard_merge_buffer(drive, 0); 1373 return idetape_position_tape(drive, 0, mt_count, 0); 1374 case MTFSR: 1375 case MTBSR: 1376 case MTLOCK: 1377 retval = ide_set_media_lock(drive, disk, 1); 1378 if (retval) 1379 return retval; 1380 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1381 return 0; 1382 case MTUNLOCK: 1383 retval = ide_set_media_lock(drive, disk, 0); 1384 if (retval) 1385 return retval; 1386 tape->door_locked = DOOR_UNLOCKED; 1387 return 0; 1388 default: 1389 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1390 mt_op); 1391 return -EIO; 1392 } 1393} 1394 1395/* 1396 * Our character device ioctls. General mtio.h magnetic io commands are 1397 * supported here, and not in the corresponding block interface. Our own 1398 * ide-tape ioctls are supported on both interfaces. 1399 */ 1400static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1401 unsigned int cmd, unsigned long arg) 1402{ 1403 struct ide_tape_obj *tape = file->private_data; 1404 ide_drive_t *drive = tape->drive; 1405 struct mtop mtop; 1406 struct mtget mtget; 1407 struct mtpos mtpos; 1408 int block_offset = 0, position = tape->first_frame; 1409 void __user *argp = (void __user *)arg; 1410 1411 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1412 1413 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1414 ide_tape_flush_merge_buffer(drive); 1415 idetape_flush_tape_buffers(drive); 1416 } 1417 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1418 block_offset = tape->valid / 1419 (tape->blk_size * tape->user_bs_factor); 1420 position = idetape_read_position(drive); 1421 if (position < 0) 1422 return -EIO; 1423 } 1424 switch (cmd) { 1425 case MTIOCTOP: 1426 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1427 return -EFAULT; 1428 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1429 case MTIOCGET: 1430 memset(&mtget, 0, sizeof(struct mtget)); 1431 mtget.mt_type = MT_ISSCSI2; 1432 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1433 mtget.mt_dsreg = 1434 ((tape->blk_size * tape->user_bs_factor) 1435 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1436 1437 if (tape->drv_write_prot) 1438 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1439 1440 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1441 return -EFAULT; 1442 return 0; 1443 case MTIOCPOS: 1444 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1445 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1446 return -EFAULT; 1447 return 0; 1448 default: 1449 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1450 ide_tape_discard_merge_buffer(drive, 1); 1451 return idetape_blkdev_ioctl(drive, cmd, arg); 1452 } 1453} 1454 1455/* 1456 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1457 * block size with the reported value. 1458 */ 1459static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1460{ 1461 idetape_tape_t *tape = drive->driver_data; 1462 struct ide_atapi_pc pc; 1463 1464 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1465 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1466 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1467 if (tape->blk_size == 0) { 1468 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1469 "block size, assuming 32k\n"); 1470 tape->blk_size = 32768; 1471 } 1472 return; 1473 } 1474 tape->blk_size = (pc.buf[4 + 5] << 16) + 1475 (pc.buf[4 + 6] << 8) + 1476 pc.buf[4 + 7]; 1477 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 1478} 1479 1480static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1481{ 1482 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1483 ide_drive_t *drive; 1484 idetape_tape_t *tape; 1485 int retval; 1486 1487 if (i >= MAX_HWIFS * MAX_DRIVES) 1488 return -ENXIO; 1489 1490 lock_kernel(); 1491 tape = ide_tape_chrdev_get(i); 1492 if (!tape) { 1493 unlock_kernel(); 1494 return -ENXIO; 1495 } 1496 1497 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1498 1499 /* 1500 * We really want to do nonseekable_open(inode, filp); here, but some 1501 * versions of tar incorrectly call lseek on tapes and bail out if that 1502 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1503 */ 1504 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1505 1506 drive = tape->drive; 1507 1508 filp->private_data = tape; 1509 1510 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1511 retval = -EBUSY; 1512 goto out_put_tape; 1513 } 1514 1515 retval = idetape_wait_ready(drive, 60 * HZ); 1516 if (retval) { 1517 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1518 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1519 goto out_put_tape; 1520 } 1521 1522 idetape_read_position(drive); 1523 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1524 (void)idetape_rewind_tape(drive); 1525 1526 /* Read block size and write protect status from drive. */ 1527 ide_tape_get_bsize_from_bdesc(drive); 1528 1529 /* Set write protect flag if device is opened as read-only. */ 1530 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1531 tape->write_prot = 1; 1532 else 1533 tape->write_prot = tape->drv_write_prot; 1534 1535 /* Make sure drive isn't write protected if user wants to write. */ 1536 if (tape->write_prot) { 1537 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1538 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1539 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1540 retval = -EROFS; 1541 goto out_put_tape; 1542 } 1543 } 1544 1545 /* Lock the tape drive door so user can't eject. */ 1546 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1547 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1548 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1549 tape->door_locked = DOOR_LOCKED; 1550 } 1551 } 1552 unlock_kernel(); 1553 return 0; 1554 1555out_put_tape: 1556 ide_tape_put(tape); 1557 unlock_kernel(); 1558 return retval; 1559} 1560 1561static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1562{ 1563 idetape_tape_t *tape = drive->driver_data; 1564 1565 ide_tape_flush_merge_buffer(drive); 1566 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1567 if (tape->buf != NULL) { 1568 idetape_pad_zeros(drive, tape->blk_size * 1569 (tape->user_bs_factor - 1)); 1570 kfree(tape->buf); 1571 tape->buf = NULL; 1572 } 1573 idetape_write_filemark(drive); 1574 idetape_flush_tape_buffers(drive); 1575 idetape_flush_tape_buffers(drive); 1576} 1577 1578static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1579{ 1580 struct ide_tape_obj *tape = filp->private_data; 1581 ide_drive_t *drive = tape->drive; 1582 unsigned int minor = iminor(inode); 1583 1584 lock_kernel(); 1585 tape = drive->driver_data; 1586 1587 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1588 1589 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1590 idetape_write_release(drive, minor); 1591 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1592 if (minor < 128) 1593 ide_tape_discard_merge_buffer(drive, 1); 1594 } 1595 1596 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1597 (void) idetape_rewind_tape(drive); 1598 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1599 if (tape->door_locked == DOOR_LOCKED) { 1600 if (!ide_set_media_lock(drive, tape->disk, 0)) 1601 tape->door_locked = DOOR_UNLOCKED; 1602 } 1603 } 1604 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1605 ide_tape_put(tape); 1606 unlock_kernel(); 1607 return 0; 1608} 1609 1610static void idetape_get_inquiry_results(ide_drive_t *drive) 1611{ 1612 idetape_tape_t *tape = drive->driver_data; 1613 struct ide_atapi_pc pc; 1614 u8 pc_buf[256]; 1615 char fw_rev[4], vendor_id[8], product_id[16]; 1616 1617 idetape_create_inquiry_cmd(&pc); 1618 pc.buf = &pc_buf[0]; 1619 pc.buf_size = sizeof(pc_buf); 1620 1621 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1622 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1623 tape->name); 1624 return; 1625 } 1626 memcpy(vendor_id, &pc.buf[8], 8); 1627 memcpy(product_id, &pc.buf[16], 16); 1628 memcpy(fw_rev, &pc.buf[32], 4); 1629 1630 ide_fixstring(vendor_id, 8, 0); 1631 ide_fixstring(product_id, 16, 0); 1632 ide_fixstring(fw_rev, 4, 0); 1633 1634 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1635 drive->name, tape->name, vendor_id, product_id, fw_rev); 1636} 1637 1638/* 1639 * Ask the tape about its various parameters. In particular, we will adjust our 1640 * data transfer buffer size to the recommended value as returned by the tape. 1641 */ 1642static void idetape_get_mode_sense_results(ide_drive_t *drive) 1643{ 1644 idetape_tape_t *tape = drive->driver_data; 1645 struct ide_atapi_pc pc; 1646 u8 *caps; 1647 u8 speed, max_speed; 1648 1649 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1650 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1651 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1652 " some default values\n"); 1653 tape->blk_size = 512; 1654 put_unaligned(52, (u16 *)&tape->caps[12]); 1655 put_unaligned(540, (u16 *)&tape->caps[14]); 1656 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1657 return; 1658 } 1659 caps = pc.buf + 4 + pc.buf[3]; 1660 1661 /* convert to host order and save for later use */ 1662 speed = be16_to_cpup((__be16 *)&caps[14]); 1663 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1664 1665 *(u16 *)&caps[8] = max_speed; 1666 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1667 *(u16 *)&caps[14] = speed; 1668 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1669 1670 if (!speed) { 1671 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1672 "(assuming 650KB/sec)\n", drive->name); 1673 *(u16 *)&caps[14] = 650; 1674 } 1675 if (!max_speed) { 1676 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1677 "(assuming 650KB/sec)\n", drive->name); 1678 *(u16 *)&caps[8] = 650; 1679 } 1680 1681 memcpy(&tape->caps, caps, 20); 1682 1683 /* device lacks locking support according to capabilities page */ 1684 if ((caps[6] & 1) == 0) 1685 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1686 1687 if (caps[7] & 0x02) 1688 tape->blk_size = 512; 1689 else if (caps[7] & 0x04) 1690 tape->blk_size = 1024; 1691} 1692 1693#ifdef CONFIG_IDE_PROC_FS 1694#define ide_tape_devset_get(name, field) \ 1695static int get_##name(ide_drive_t *drive) \ 1696{ \ 1697 idetape_tape_t *tape = drive->driver_data; \ 1698 return tape->field; \ 1699} 1700 1701#define ide_tape_devset_set(name, field) \ 1702static int set_##name(ide_drive_t *drive, int arg) \ 1703{ \ 1704 idetape_tape_t *tape = drive->driver_data; \ 1705 tape->field = arg; \ 1706 return 0; \ 1707} 1708 1709#define ide_tape_devset_rw_field(_name, _field) \ 1710ide_tape_devset_get(_name, _field) \ 1711ide_tape_devset_set(_name, _field) \ 1712IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1713 1714#define ide_tape_devset_r_field(_name, _field) \ 1715ide_tape_devset_get(_name, _field) \ 1716IDE_DEVSET(_name, 0, get_##_name, NULL) 1717 1718static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1719static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1720static int divf_buffer(ide_drive_t *drive) { return 2; } 1721static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1722 1723ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1724 1725ide_tape_devset_rw_field(debug_mask, debug_mask); 1726ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1727 1728ide_tape_devset_r_field(avg_speed, avg_speed); 1729ide_tape_devset_r_field(speed, caps[14]); 1730ide_tape_devset_r_field(buffer, caps[16]); 1731ide_tape_devset_r_field(buffer_size, buffer_size); 1732 1733static const struct ide_proc_devset idetape_settings[] = { 1734 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1735 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1736 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1737 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1738 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1739 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1740 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1741 mulf_tdsc, divf_tdsc), 1742 { NULL }, 1743}; 1744#endif 1745 1746/* 1747 * The function below is called to: 1748 * 1749 * 1. Initialize our various state variables. 1750 * 2. Ask the tape for its capabilities. 1751 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1752 * is chosen based on the recommendation which we received in step 2. 1753 * 1754 * Note that at this point ide.c already assigned us an irq, so that we can 1755 * queue requests here and wait for their completion. 1756 */ 1757static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1758{ 1759 unsigned long t; 1760 int speed; 1761 int buffer_size; 1762 u16 *ctl = (u16 *)&tape->caps[12]; 1763 1764 drive->pc_callback = ide_tape_callback; 1765 1766 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1767 1768 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1769 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1770 tape->name); 1771 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1772 } 1773 1774 /* Seagate Travan drives do not support DSC overlap. */ 1775 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1776 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1777 1778 tape->minor = minor; 1779 tape->name[0] = 'h'; 1780 tape->name[1] = 't'; 1781 tape->name[2] = '0' + minor; 1782 tape->chrdev_dir = IDETAPE_DIR_NONE; 1783 1784 idetape_get_inquiry_results(drive); 1785 idetape_get_mode_sense_results(drive); 1786 ide_tape_get_bsize_from_bdesc(drive); 1787 tape->user_bs_factor = 1; 1788 tape->buffer_size = *ctl * tape->blk_size; 1789 while (tape->buffer_size > 0xffff) { 1790 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1791 *ctl /= 2; 1792 tape->buffer_size = *ctl * tape->blk_size; 1793 } 1794 buffer_size = tape->buffer_size; 1795 1796 /* select the "best" DSC read/write polling freq */ 1797 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1798 1799 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1800 1801 /* 1802 * Ensure that the number we got makes sense; limit it within 1803 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1804 */ 1805 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1806 IDETAPE_DSC_RW_MAX); 1807 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1808 "%lums tDSC%s\n", 1809 drive->name, tape->name, *(u16 *)&tape->caps[14], 1810 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1811 tape->buffer_size / 1024, 1812 tape->best_dsc_rw_freq * 1000 / HZ, 1813 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1814 1815 ide_proc_register_driver(drive, tape->driver); 1816} 1817 1818static void ide_tape_remove(ide_drive_t *drive) 1819{ 1820 idetape_tape_t *tape = drive->driver_data; 1821 1822 ide_proc_unregister_driver(drive, tape->driver); 1823 device_del(&tape->dev); 1824 ide_unregister_region(tape->disk); 1825 1826 mutex_lock(&idetape_ref_mutex); 1827 put_device(&tape->dev); 1828 mutex_unlock(&idetape_ref_mutex); 1829} 1830 1831static void ide_tape_release(struct device *dev) 1832{ 1833 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1834 ide_drive_t *drive = tape->drive; 1835 struct gendisk *g = tape->disk; 1836 1837 BUG_ON(tape->valid); 1838 1839 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1840 drive->driver_data = NULL; 1841 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1842 device_destroy(idetape_sysfs_class, 1843 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1844 idetape_devs[tape->minor] = NULL; 1845 g->private_data = NULL; 1846 put_disk(g); 1847 kfree(tape); 1848} 1849 1850#ifdef CONFIG_IDE_PROC_FS 1851static int proc_idetape_read_name 1852 (char *page, char **start, off_t off, int count, int *eof, void *data) 1853{ 1854 ide_drive_t *drive = (ide_drive_t *) data; 1855 idetape_tape_t *tape = drive->driver_data; 1856 char *out = page; 1857 int len; 1858 1859 len = sprintf(out, "%s\n", tape->name); 1860 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1861} 1862 1863static ide_proc_entry_t idetape_proc[] = { 1864 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1865 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1866 { NULL, 0, NULL, NULL } 1867}; 1868 1869static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1870{ 1871 return idetape_proc; 1872} 1873 1874static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1875{ 1876 return idetape_settings; 1877} 1878#endif 1879 1880static int ide_tape_probe(ide_drive_t *); 1881 1882static struct ide_driver idetape_driver = { 1883 .gen_driver = { 1884 .owner = THIS_MODULE, 1885 .name = "ide-tape", 1886 .bus = &ide_bus_type, 1887 }, 1888 .probe = ide_tape_probe, 1889 .remove = ide_tape_remove, 1890 .version = IDETAPE_VERSION, 1891 .do_request = idetape_do_request, 1892#ifdef CONFIG_IDE_PROC_FS 1893 .proc_entries = ide_tape_proc_entries, 1894 .proc_devsets = ide_tape_proc_devsets, 1895#endif 1896}; 1897 1898/* Our character device supporting functions, passed to register_chrdev. */ 1899static const struct file_operations idetape_fops = { 1900 .owner = THIS_MODULE, 1901 .read = idetape_chrdev_read, 1902 .write = idetape_chrdev_write, 1903 .ioctl = idetape_chrdev_ioctl, 1904 .open = idetape_chrdev_open, 1905 .release = idetape_chrdev_release, 1906}; 1907 1908static int idetape_open(struct block_device *bdev, fmode_t mode) 1909{ 1910 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1911 1912 if (!tape) 1913 return -ENXIO; 1914 1915 return 0; 1916} 1917 1918static int idetape_release(struct gendisk *disk, fmode_t mode) 1919{ 1920 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1921 1922 ide_tape_put(tape); 1923 return 0; 1924} 1925 1926static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1927 unsigned int cmd, unsigned long arg) 1928{ 1929 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1930 ide_drive_t *drive = tape->drive; 1931 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1932 if (err == -EINVAL) 1933 err = idetape_blkdev_ioctl(drive, cmd, arg); 1934 return err; 1935} 1936 1937static struct block_device_operations idetape_block_ops = { 1938 .owner = THIS_MODULE, 1939 .open = idetape_open, 1940 .release = idetape_release, 1941 .locked_ioctl = idetape_ioctl, 1942}; 1943 1944static int ide_tape_probe(ide_drive_t *drive) 1945{ 1946 idetape_tape_t *tape; 1947 struct gendisk *g; 1948 int minor; 1949 1950 if (!strstr("ide-tape", drive->driver_req)) 1951 goto failed; 1952 1953 if (drive->media != ide_tape) 1954 goto failed; 1955 1956 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 1957 ide_check_atapi_device(drive, DRV_NAME) == 0) { 1958 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 1959 " the driver\n", drive->name); 1960 goto failed; 1961 } 1962 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 1963 if (tape == NULL) { 1964 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 1965 drive->name); 1966 goto failed; 1967 } 1968 1969 g = alloc_disk(1 << PARTN_BITS); 1970 if (!g) 1971 goto out_free_tape; 1972 1973 ide_init_disk(g, drive); 1974 1975 tape->dev.parent = &drive->gendev; 1976 tape->dev.release = ide_tape_release; 1977 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 1978 1979 if (device_register(&tape->dev)) 1980 goto out_free_disk; 1981 1982 tape->drive = drive; 1983 tape->driver = &idetape_driver; 1984 tape->disk = g; 1985 1986 g->private_data = &tape->driver; 1987 1988 drive->driver_data = tape; 1989 1990 mutex_lock(&idetape_ref_mutex); 1991 for (minor = 0; idetape_devs[minor]; minor++) 1992 ; 1993 idetape_devs[minor] = tape; 1994 mutex_unlock(&idetape_ref_mutex); 1995 1996 idetape_setup(drive, tape, minor); 1997 1998 device_create(idetape_sysfs_class, &drive->gendev, 1999 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 2000 device_create(idetape_sysfs_class, &drive->gendev, 2001 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2002 "n%s", tape->name); 2003 2004 g->fops = &idetape_block_ops; 2005 ide_register_region(g); 2006 2007 return 0; 2008 2009out_free_disk: 2010 put_disk(g); 2011out_free_tape: 2012 kfree(tape); 2013failed: 2014 return -ENODEV; 2015} 2016 2017static void __exit idetape_exit(void) 2018{ 2019 driver_unregister(&idetape_driver.gen_driver); 2020 class_destroy(idetape_sysfs_class); 2021 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2022} 2023 2024static int __init idetape_init(void) 2025{ 2026 int error = 1; 2027 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2028 if (IS_ERR(idetape_sysfs_class)) { 2029 idetape_sysfs_class = NULL; 2030 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2031 error = -EBUSY; 2032 goto out; 2033 } 2034 2035 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2036 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2037 " interface\n"); 2038 error = -EBUSY; 2039 goto out_free_class; 2040 } 2041 2042 error = driver_register(&idetape_driver.gen_driver); 2043 if (error) 2044 goto out_free_driver; 2045 2046 return 0; 2047 2048out_free_driver: 2049 driver_unregister(&idetape_driver.gen_driver); 2050out_free_class: 2051 class_destroy(idetape_sysfs_class); 2052out: 2053 return error; 2054} 2055 2056MODULE_ALIAS("ide:*m-tape*"); 2057module_init(idetape_init); 2058module_exit(idetape_exit); 2059MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2060MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2061MODULE_LICENSE("GPL"); 2062