ide-tape.c revision ae3a8387be529e632eac69b342524c25b892fc63
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 } 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 struct request *rq = drive->hwif->rq; 488 489 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 490 drive->failed_pc = pc; 491 492 /* Set the current packet command */ 493 drive->pc = pc; 494 495 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 496 (pc->flags & PC_FLAG_ABORT)) { 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, blk_rq_bytes(rq)); 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 = blk_rq_sectors(rq) / (tape->blk_size >> 9); 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 = blk_rq_bytes(rq); 596 if (pc->buf_size == tape->buffer_size) 597 pc->flags |= PC_FLAG_DMA_OK; 598 599 if (opcode == READ_6) 600 pc->c[0] = READ_6; 601 else if (opcode == WRITE_6) { 602 pc->c[0] = WRITE_6; 603 pc->flags |= PC_FLAG_WRITING; 604 } 605 606 memcpy(rq->cmd, pc->c, 12); 607} 608 609static ide_startstop_t idetape_do_request(ide_drive_t *drive, 610 struct request *rq, sector_t block) 611{ 612 ide_hwif_t *hwif = drive->hwif; 613 idetape_tape_t *tape = drive->driver_data; 614 struct ide_atapi_pc *pc = NULL; 615 struct request *postponed_rq = tape->postponed_rq; 616 struct ide_cmd cmd; 617 u8 stat; 618 619 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n" 620 (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq)); 621 622 if (!(blk_special_request(rq) || blk_sense_request(rq))) { 623 /* We do not support buffer cache originated requests. */ 624 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 625 "request queue (%d)\n", drive->name, rq->cmd_type); 626 if (blk_fs_request(rq) == 0 && rq->errors == 0) 627 rq->errors = -EIO; 628 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); 629 return ide_stopped; 630 } 631 632 /* Retry a failed packet command */ 633 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 634 pc = drive->failed_pc; 635 goto out; 636 } 637 638 if (postponed_rq != NULL) 639 if (rq != postponed_rq) { 640 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 641 "Two DSC requests were queued\n"); 642 drive->failed_pc = NULL; 643 rq->errors = 0; 644 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 645 return ide_stopped; 646 } 647 648 tape->postponed_rq = NULL; 649 650 /* 651 * If the tape is still busy, postpone our request and service 652 * the other device meanwhile. 653 */ 654 stat = hwif->tp_ops->read_status(hwif); 655 656 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 657 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 658 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 659 660 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 661 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 662 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 663 } 664 665 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && 666 (stat & ATA_DSC) == 0) { 667 if (postponed_rq == NULL) { 668 tape->dsc_polling_start = jiffies; 669 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 670 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 671 } else if (time_after(jiffies, tape->dsc_timeout)) { 672 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 673 tape->name); 674 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 675 idetape_media_access_finished(drive); 676 return ide_stopped; 677 } else { 678 return ide_do_reset(drive); 679 } 680 } else if (time_after(jiffies, 681 tape->dsc_polling_start + 682 IDETAPE_DSC_MA_THRESHOLD)) 683 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 684 idetape_postpone_request(drive); 685 return ide_stopped; 686 } 687 if (rq->cmd[13] & REQ_IDETAPE_READ) { 688 pc = &tape->queued_pc; 689 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 690 goto out; 691 } 692 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 693 pc = &tape->queued_pc; 694 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 695 goto out; 696 } 697 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 698 pc = (struct ide_atapi_pc *)rq->special; 699 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 700 rq->cmd[13] |= REQ_IDETAPE_PC2; 701 goto out; 702 } 703 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 704 idetape_media_access_finished(drive); 705 return ide_stopped; 706 } 707 BUG(); 708 709out: 710 /* prepare sense request for this command */ 711 ide_prep_sense(drive, rq); 712 713 memset(&cmd, 0, sizeof(cmd)); 714 715 if (rq_data_dir(rq)) 716 cmd.tf_flags |= IDE_TFLAG_WRITE; 717 718 cmd.rq = rq; 719 720 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); 721 ide_map_sg(drive, &cmd); 722 723 return ide_tape_issue_pc(drive, &cmd, pc); 724} 725 726/* 727 * Write a filemark if write_filemark=1. Flush the device buffers without 728 * writing a filemark otherwise. 729 */ 730static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 731 struct ide_atapi_pc *pc, int write_filemark) 732{ 733 ide_init_pc(pc); 734 pc->c[0] = WRITE_FILEMARKS; 735 pc->c[4] = write_filemark; 736 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 737} 738 739static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 740{ 741 idetape_tape_t *tape = drive->driver_data; 742 struct gendisk *disk = tape->disk; 743 int load_attempted = 0; 744 745 /* Wait for the tape to become ready */ 746 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 747 timeout += jiffies; 748 while (time_before(jiffies, timeout)) { 749 if (ide_do_test_unit_ready(drive, disk) == 0) 750 return 0; 751 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 752 || (tape->asc == 0x3A)) { 753 /* no media */ 754 if (load_attempted) 755 return -ENOMEDIUM; 756 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 757 load_attempted = 1; 758 /* not about to be ready */ 759 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 760 (tape->ascq == 1 || tape->ascq == 8))) 761 return -EIO; 762 msleep(100); 763 } 764 return -EIO; 765} 766 767static int idetape_flush_tape_buffers(ide_drive_t *drive) 768{ 769 struct ide_tape_obj *tape = drive->driver_data; 770 struct ide_atapi_pc pc; 771 int rc; 772 773 idetape_create_write_filemark_cmd(drive, &pc, 0); 774 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); 775 if (rc) 776 return rc; 777 idetape_wait_ready(drive, 60 * 5 * HZ); 778 return 0; 779} 780 781static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 782{ 783 ide_init_pc(pc); 784 pc->c[0] = READ_POSITION; 785 pc->req_xfer = 20; 786} 787 788static int idetape_read_position(ide_drive_t *drive) 789{ 790 idetape_tape_t *tape = drive->driver_data; 791 struct ide_atapi_pc pc; 792 int position; 793 794 debug_log(DBG_PROCS, "Enter %s\n", __func__); 795 796 idetape_create_read_position_cmd(&pc); 797 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.buf, pc.req_xfer)) 798 return -1; 799 position = tape->first_frame; 800 return position; 801} 802 803static void idetape_create_locate_cmd(ide_drive_t *drive, 804 struct ide_atapi_pc *pc, 805 unsigned int block, u8 partition, int skip) 806{ 807 ide_init_pc(pc); 808 pc->c[0] = POSITION_TO_ELEMENT; 809 pc->c[1] = 2; 810 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 811 pc->c[8] = partition; 812 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 813} 814 815static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 816{ 817 idetape_tape_t *tape = drive->driver_data; 818 819 if (tape->chrdev_dir != IDETAPE_DIR_READ) 820 return; 821 822 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 823 tape->valid = 0; 824 if (tape->buf != NULL) { 825 kfree(tape->buf); 826 tape->buf = NULL; 827 } 828 829 tape->chrdev_dir = IDETAPE_DIR_NONE; 830} 831 832/* 833 * Position the tape to the requested block using the LOCATE packet command. 834 * A READ POSITION command is then issued to check where we are positioned. Like 835 * all higher level operations, we queue the commands at the tail of the request 836 * queue and wait for their completion. 837 */ 838static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 839 u8 partition, int skip) 840{ 841 idetape_tape_t *tape = drive->driver_data; 842 struct gendisk *disk = tape->disk; 843 int retval; 844 struct ide_atapi_pc pc; 845 846 if (tape->chrdev_dir == IDETAPE_DIR_READ) 847 __ide_tape_discard_merge_buffer(drive); 848 idetape_wait_ready(drive, 60 * 5 * HZ); 849 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 850 retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 851 if (retval) 852 return (retval); 853 854 idetape_create_read_position_cmd(&pc); 855 return ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer); 856} 857 858static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 859 int restore_position) 860{ 861 idetape_tape_t *tape = drive->driver_data; 862 int seek, position; 863 864 __ide_tape_discard_merge_buffer(drive); 865 if (restore_position) { 866 position = idetape_read_position(drive); 867 seek = position > 0 ? position : 0; 868 if (idetape_position_tape(drive, seek, 0, 0)) { 869 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 870 " %s\n", tape->name, __func__); 871 return; 872 } 873 } 874} 875 876/* 877 * Generate a read/write request for the block device interface and wait for it 878 * to be serviced. 879 */ 880static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 881{ 882 idetape_tape_t *tape = drive->driver_data; 883 struct request *rq; 884 int ret; 885 886 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 887 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 888 BUG_ON(size < 0 || size % tape->blk_size); 889 890 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 891 rq->cmd_type = REQ_TYPE_SPECIAL; 892 rq->cmd[13] = cmd; 893 rq->rq_disk = tape->disk; 894 895 if (size) { 896 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 897 __GFP_WAIT); 898 if (ret) 899 goto out_put; 900 } 901 902 blk_execute_rq(drive->queue, tape->disk, rq, 0); 903 904 /* calculate the number of transferred bytes and update buffer state */ 905 size -= rq->resid_len; 906 tape->cur = tape->buf; 907 if (cmd == REQ_IDETAPE_READ) 908 tape->valid = size; 909 else 910 tape->valid = 0; 911 912 ret = size; 913 if (rq->errors == IDE_DRV_ERROR_GENERAL) 914 ret = -EIO; 915out_put: 916 blk_put_request(rq); 917 return ret; 918} 919 920static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 921{ 922 ide_init_pc(pc); 923 pc->c[0] = INQUIRY; 924 pc->c[4] = 254; 925 pc->req_xfer = 254; 926} 927 928static void idetape_create_rewind_cmd(ide_drive_t *drive, 929 struct ide_atapi_pc *pc) 930{ 931 ide_init_pc(pc); 932 pc->c[0] = REZERO_UNIT; 933 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 934} 935 936static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 937{ 938 ide_init_pc(pc); 939 pc->c[0] = ERASE; 940 pc->c[1] = 1; 941 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 942} 943 944static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 945{ 946 ide_init_pc(pc); 947 pc->c[0] = SPACE; 948 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 949 pc->c[1] = cmd; 950 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 951} 952 953static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 954{ 955 idetape_tape_t *tape = drive->driver_data; 956 957 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 958 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 959 " but we are not writing.\n"); 960 return; 961 } 962 if (tape->buf) { 963 size_t aligned = roundup(tape->valid, tape->blk_size); 964 965 memset(tape->cur, 0, aligned - tape->valid); 966 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); 967 kfree(tape->buf); 968 tape->buf = NULL; 969 } 970 tape->chrdev_dir = IDETAPE_DIR_NONE; 971} 972 973static int idetape_init_rw(ide_drive_t *drive, int dir) 974{ 975 idetape_tape_t *tape = drive->driver_data; 976 int rc; 977 978 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 979 980 if (tape->chrdev_dir == dir) 981 return 0; 982 983 if (tape->chrdev_dir == IDETAPE_DIR_READ) 984 ide_tape_discard_merge_buffer(drive, 1); 985 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 986 ide_tape_flush_merge_buffer(drive); 987 idetape_flush_tape_buffers(drive); 988 } 989 990 if (tape->buf || tape->valid) { 991 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 992 tape->valid = 0; 993 } 994 995 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 996 if (!tape->buf) 997 return -ENOMEM; 998 tape->chrdev_dir = dir; 999 tape->cur = tape->buf; 1000 1001 /* 1002 * Issue a 0 rw command to ensure that DSC handshake is 1003 * switched from completion mode to buffer available mode. No 1004 * point in issuing this if DSC overlap isn't supported, some 1005 * drives (Seagate STT3401A) will return an error. 1006 */ 1007 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1008 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 1009 : REQ_IDETAPE_WRITE; 1010 1011 rc = idetape_queue_rw_tail(drive, cmd, 0); 1012 if (rc < 0) { 1013 kfree(tape->buf); 1014 tape->buf = NULL; 1015 tape->chrdev_dir = IDETAPE_DIR_NONE; 1016 return rc; 1017 } 1018 } 1019 1020 return 0; 1021} 1022 1023static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1024{ 1025 idetape_tape_t *tape = drive->driver_data; 1026 1027 memset(tape->buf, 0, tape->buffer_size); 1028 1029 while (bcount) { 1030 unsigned int count = min(tape->buffer_size, bcount); 1031 1032 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1033 bcount -= count; 1034 } 1035} 1036 1037/* 1038 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1039 * currently support only one partition. 1040 */ 1041static int idetape_rewind_tape(ide_drive_t *drive) 1042{ 1043 struct ide_tape_obj *tape = drive->driver_data; 1044 struct gendisk *disk = tape->disk; 1045 int retval; 1046 struct ide_atapi_pc pc; 1047 1048 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1049 1050 idetape_create_rewind_cmd(drive, &pc); 1051 retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1052 if (retval) 1053 return retval; 1054 1055 idetape_create_read_position_cmd(&pc); 1056 retval = ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer); 1057 if (retval) 1058 return retval; 1059 return 0; 1060} 1061 1062/* mtio.h compatible commands should be issued to the chrdev interface. */ 1063static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1064 unsigned long arg) 1065{ 1066 idetape_tape_t *tape = drive->driver_data; 1067 void __user *argp = (void __user *)arg; 1068 1069 struct idetape_config { 1070 int dsc_rw_frequency; 1071 int dsc_media_access_frequency; 1072 int nr_stages; 1073 } config; 1074 1075 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1076 1077 switch (cmd) { 1078 case 0x0340: 1079 if (copy_from_user(&config, argp, sizeof(config))) 1080 return -EFAULT; 1081 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1082 break; 1083 case 0x0350: 1084 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1085 config.nr_stages = 1; 1086 if (copy_to_user(argp, &config, sizeof(config))) 1087 return -EFAULT; 1088 break; 1089 default: 1090 return -EIO; 1091 } 1092 return 0; 1093} 1094 1095static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1096 int mt_count) 1097{ 1098 idetape_tape_t *tape = drive->driver_data; 1099 struct gendisk *disk = tape->disk; 1100 struct ide_atapi_pc pc; 1101 int retval, count = 0; 1102 int sprev = !!(tape->caps[4] & 0x20); 1103 1104 if (mt_count == 0) 1105 return 0; 1106 if (MTBSF == mt_op || MTBSFM == mt_op) { 1107 if (!sprev) 1108 return -EIO; 1109 mt_count = -mt_count; 1110 } 1111 1112 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1113 tape->valid = 0; 1114 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1115 ++count; 1116 ide_tape_discard_merge_buffer(drive, 0); 1117 } 1118 1119 switch (mt_op) { 1120 case MTFSF: 1121 case MTBSF: 1122 idetape_create_space_cmd(&pc, mt_count - count, 1123 IDETAPE_SPACE_OVER_FILEMARK); 1124 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1125 case MTFSFM: 1126 case MTBSFM: 1127 if (!sprev) 1128 return -EIO; 1129 retval = idetape_space_over_filemarks(drive, MTFSF, 1130 mt_count - count); 1131 if (retval) 1132 return retval; 1133 count = (MTBSFM == mt_op ? 1 : -1); 1134 return idetape_space_over_filemarks(drive, MTFSF, count); 1135 default: 1136 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1137 mt_op); 1138 return -EIO; 1139 } 1140} 1141 1142/* 1143 * Our character device read / write functions. 1144 * 1145 * The tape is optimized to maximize throughput when it is transferring an 1146 * integral number of the "continuous transfer limit", which is a parameter of 1147 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1148 * 1149 * As of version 1.3 of the driver, the character device provides an abstract 1150 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1151 * same backup/restore procedure is supported. The driver will internally 1152 * convert the requests to the recommended transfer unit, so that an unmatch 1153 * between the user's block size to the recommended size will only result in a 1154 * (slightly) increased driver overhead, but will no longer hit performance. 1155 * This is not applicable to Onstream. 1156 */ 1157static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1158 size_t count, loff_t *ppos) 1159{ 1160 struct ide_tape_obj *tape = file->private_data; 1161 ide_drive_t *drive = tape->drive; 1162 size_t done = 0; 1163 ssize_t ret = 0; 1164 int rc; 1165 1166 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1167 1168 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1169 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1170 if (count > tape->blk_size && 1171 (count % tape->blk_size) == 0) 1172 tape->user_bs_factor = count / tape->blk_size; 1173 } 1174 1175 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1176 if (rc < 0) 1177 return rc; 1178 1179 while (done < count) { 1180 size_t todo; 1181 1182 /* refill if staging buffer is empty */ 1183 if (!tape->valid) { 1184 /* If we are at a filemark, nothing more to read */ 1185 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1186 break; 1187 /* read */ 1188 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1189 tape->buffer_size) <= 0) 1190 break; 1191 } 1192 1193 /* copy out */ 1194 todo = min_t(size_t, count - done, tape->valid); 1195 if (copy_to_user(buf + done, tape->cur, todo)) 1196 ret = -EFAULT; 1197 1198 tape->cur += todo; 1199 tape->valid -= todo; 1200 done += todo; 1201 } 1202 1203 if (!done && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1204 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1205 1206 idetape_space_over_filemarks(drive, MTFSF, 1); 1207 return 0; 1208 } 1209 1210 return ret ? ret : done; 1211} 1212 1213static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1214 size_t count, loff_t *ppos) 1215{ 1216 struct ide_tape_obj *tape = file->private_data; 1217 ide_drive_t *drive = tape->drive; 1218 size_t done = 0; 1219 ssize_t ret = 0; 1220 int rc; 1221 1222 /* The drive is write protected. */ 1223 if (tape->write_prot) 1224 return -EACCES; 1225 1226 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1227 1228 /* Initialize write operation */ 1229 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1230 if (rc < 0) 1231 return rc; 1232 1233 while (done < count) { 1234 size_t todo; 1235 1236 /* flush if staging buffer is full */ 1237 if (tape->valid == tape->buffer_size && 1238 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1239 tape->buffer_size) <= 0) 1240 return rc; 1241 1242 /* copy in */ 1243 todo = min_t(size_t, count - done, 1244 tape->buffer_size - tape->valid); 1245 if (copy_from_user(tape->cur, buf + done, todo)) 1246 ret = -EFAULT; 1247 1248 tape->cur += todo; 1249 tape->valid += todo; 1250 done += todo; 1251 } 1252 1253 return ret ? ret : done; 1254} 1255 1256static int idetape_write_filemark(ide_drive_t *drive) 1257{ 1258 struct ide_tape_obj *tape = drive->driver_data; 1259 struct ide_atapi_pc pc; 1260 1261 /* Write a filemark */ 1262 idetape_create_write_filemark_cmd(drive, &pc, 1); 1263 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { 1264 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1265 return -EIO; 1266 } 1267 return 0; 1268} 1269 1270/* 1271 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1272 * requested. 1273 * 1274 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1275 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1276 * usually not supported. 1277 * 1278 * The following commands are currently not supported: 1279 * 1280 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1281 * MT_ST_WRITE_THRESHOLD. 1282 */ 1283static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1284{ 1285 idetape_tape_t *tape = drive->driver_data; 1286 struct gendisk *disk = tape->disk; 1287 struct ide_atapi_pc pc; 1288 int i, retval; 1289 1290 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1291 mt_op, mt_count); 1292 1293 switch (mt_op) { 1294 case MTFSF: 1295 case MTFSFM: 1296 case MTBSF: 1297 case MTBSFM: 1298 if (!mt_count) 1299 return 0; 1300 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1301 default: 1302 break; 1303 } 1304 1305 switch (mt_op) { 1306 case MTWEOF: 1307 if (tape->write_prot) 1308 return -EACCES; 1309 ide_tape_discard_merge_buffer(drive, 1); 1310 for (i = 0; i < mt_count; i++) { 1311 retval = idetape_write_filemark(drive); 1312 if (retval) 1313 return retval; 1314 } 1315 return 0; 1316 case MTREW: 1317 ide_tape_discard_merge_buffer(drive, 0); 1318 if (idetape_rewind_tape(drive)) 1319 return -EIO; 1320 return 0; 1321 case MTLOAD: 1322 ide_tape_discard_merge_buffer(drive, 0); 1323 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1324 case MTUNLOAD: 1325 case MTOFFL: 1326 /* 1327 * If door is locked, attempt to unlock before 1328 * attempting to eject. 1329 */ 1330 if (tape->door_locked) { 1331 if (!ide_set_media_lock(drive, disk, 0)) 1332 tape->door_locked = DOOR_UNLOCKED; 1333 } 1334 ide_tape_discard_merge_buffer(drive, 0); 1335 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1336 if (!retval) 1337 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1338 return retval; 1339 case MTNOP: 1340 ide_tape_discard_merge_buffer(drive, 0); 1341 return idetape_flush_tape_buffers(drive); 1342 case MTRETEN: 1343 ide_tape_discard_merge_buffer(drive, 0); 1344 return ide_do_start_stop(drive, disk, 1345 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1346 case MTEOM: 1347 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1348 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1349 case MTERASE: 1350 (void)idetape_rewind_tape(drive); 1351 idetape_create_erase_cmd(&pc); 1352 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1353 case MTSETBLK: 1354 if (mt_count) { 1355 if (mt_count < tape->blk_size || 1356 mt_count % tape->blk_size) 1357 return -EIO; 1358 tape->user_bs_factor = mt_count / tape->blk_size; 1359 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1360 } else 1361 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1362 return 0; 1363 case MTSEEK: 1364 ide_tape_discard_merge_buffer(drive, 0); 1365 return idetape_position_tape(drive, 1366 mt_count * tape->user_bs_factor, tape->partition, 0); 1367 case MTSETPART: 1368 ide_tape_discard_merge_buffer(drive, 0); 1369 return idetape_position_tape(drive, 0, mt_count, 0); 1370 case MTFSR: 1371 case MTBSR: 1372 case MTLOCK: 1373 retval = ide_set_media_lock(drive, disk, 1); 1374 if (retval) 1375 return retval; 1376 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1377 return 0; 1378 case MTUNLOCK: 1379 retval = ide_set_media_lock(drive, disk, 0); 1380 if (retval) 1381 return retval; 1382 tape->door_locked = DOOR_UNLOCKED; 1383 return 0; 1384 default: 1385 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1386 mt_op); 1387 return -EIO; 1388 } 1389} 1390 1391/* 1392 * Our character device ioctls. General mtio.h magnetic io commands are 1393 * supported here, and not in the corresponding block interface. Our own 1394 * ide-tape ioctls are supported on both interfaces. 1395 */ 1396static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1397 unsigned int cmd, unsigned long arg) 1398{ 1399 struct ide_tape_obj *tape = file->private_data; 1400 ide_drive_t *drive = tape->drive; 1401 struct mtop mtop; 1402 struct mtget mtget; 1403 struct mtpos mtpos; 1404 int block_offset = 0, position = tape->first_frame; 1405 void __user *argp = (void __user *)arg; 1406 1407 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1408 1409 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1410 ide_tape_flush_merge_buffer(drive); 1411 idetape_flush_tape_buffers(drive); 1412 } 1413 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1414 block_offset = tape->valid / 1415 (tape->blk_size * tape->user_bs_factor); 1416 position = idetape_read_position(drive); 1417 if (position < 0) 1418 return -EIO; 1419 } 1420 switch (cmd) { 1421 case MTIOCTOP: 1422 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1423 return -EFAULT; 1424 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1425 case MTIOCGET: 1426 memset(&mtget, 0, sizeof(struct mtget)); 1427 mtget.mt_type = MT_ISSCSI2; 1428 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1429 mtget.mt_dsreg = 1430 ((tape->blk_size * tape->user_bs_factor) 1431 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1432 1433 if (tape->drv_write_prot) 1434 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1435 1436 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1437 return -EFAULT; 1438 return 0; 1439 case MTIOCPOS: 1440 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1441 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1442 return -EFAULT; 1443 return 0; 1444 default: 1445 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1446 ide_tape_discard_merge_buffer(drive, 1); 1447 return idetape_blkdev_ioctl(drive, cmd, arg); 1448 } 1449} 1450 1451/* 1452 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1453 * block size with the reported value. 1454 */ 1455static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1456{ 1457 idetape_tape_t *tape = drive->driver_data; 1458 struct ide_atapi_pc pc; 1459 1460 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1461 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.buf, pc.req_xfer)) { 1462 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1463 if (tape->blk_size == 0) { 1464 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1465 "block size, assuming 32k\n"); 1466 tape->blk_size = 32768; 1467 } 1468 return; 1469 } 1470 tape->blk_size = (pc.buf[4 + 5] << 16) + 1471 (pc.buf[4 + 6] << 8) + 1472 pc.buf[4 + 7]; 1473 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 1474} 1475 1476static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1477{ 1478 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1479 ide_drive_t *drive; 1480 idetape_tape_t *tape; 1481 int retval; 1482 1483 if (i >= MAX_HWIFS * MAX_DRIVES) 1484 return -ENXIO; 1485 1486 lock_kernel(); 1487 tape = ide_tape_chrdev_get(i); 1488 if (!tape) { 1489 unlock_kernel(); 1490 return -ENXIO; 1491 } 1492 1493 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1494 1495 /* 1496 * We really want to do nonseekable_open(inode, filp); here, but some 1497 * versions of tar incorrectly call lseek on tapes and bail out if that 1498 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1499 */ 1500 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1501 1502 drive = tape->drive; 1503 1504 filp->private_data = tape; 1505 1506 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1507 retval = -EBUSY; 1508 goto out_put_tape; 1509 } 1510 1511 retval = idetape_wait_ready(drive, 60 * HZ); 1512 if (retval) { 1513 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1514 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1515 goto out_put_tape; 1516 } 1517 1518 idetape_read_position(drive); 1519 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1520 (void)idetape_rewind_tape(drive); 1521 1522 /* Read block size and write protect status from drive. */ 1523 ide_tape_get_bsize_from_bdesc(drive); 1524 1525 /* Set write protect flag if device is opened as read-only. */ 1526 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1527 tape->write_prot = 1; 1528 else 1529 tape->write_prot = tape->drv_write_prot; 1530 1531 /* Make sure drive isn't write protected if user wants to write. */ 1532 if (tape->write_prot) { 1533 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1534 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1535 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1536 retval = -EROFS; 1537 goto out_put_tape; 1538 } 1539 } 1540 1541 /* Lock the tape drive door so user can't eject. */ 1542 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1543 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1544 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1545 tape->door_locked = DOOR_LOCKED; 1546 } 1547 } 1548 unlock_kernel(); 1549 return 0; 1550 1551out_put_tape: 1552 ide_tape_put(tape); 1553 unlock_kernel(); 1554 return retval; 1555} 1556 1557static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1558{ 1559 idetape_tape_t *tape = drive->driver_data; 1560 1561 ide_tape_flush_merge_buffer(drive); 1562 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1563 if (tape->buf != NULL) { 1564 idetape_pad_zeros(drive, tape->blk_size * 1565 (tape->user_bs_factor - 1)); 1566 kfree(tape->buf); 1567 tape->buf = NULL; 1568 } 1569 idetape_write_filemark(drive); 1570 idetape_flush_tape_buffers(drive); 1571 idetape_flush_tape_buffers(drive); 1572} 1573 1574static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1575{ 1576 struct ide_tape_obj *tape = filp->private_data; 1577 ide_drive_t *drive = tape->drive; 1578 unsigned int minor = iminor(inode); 1579 1580 lock_kernel(); 1581 tape = drive->driver_data; 1582 1583 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1584 1585 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1586 idetape_write_release(drive, minor); 1587 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1588 if (minor < 128) 1589 ide_tape_discard_merge_buffer(drive, 1); 1590 } 1591 1592 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1593 (void) idetape_rewind_tape(drive); 1594 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1595 if (tape->door_locked == DOOR_LOCKED) { 1596 if (!ide_set_media_lock(drive, tape->disk, 0)) 1597 tape->door_locked = DOOR_UNLOCKED; 1598 } 1599 } 1600 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1601 ide_tape_put(tape); 1602 unlock_kernel(); 1603 return 0; 1604} 1605 1606static void idetape_get_inquiry_results(ide_drive_t *drive) 1607{ 1608 idetape_tape_t *tape = drive->driver_data; 1609 struct ide_atapi_pc pc; 1610 u8 pc_buf[256]; 1611 char fw_rev[4], vendor_id[8], product_id[16]; 1612 1613 idetape_create_inquiry_cmd(&pc); 1614 pc.buf_size = sizeof(pc_buf); 1615 1616 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { 1617 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1618 tape->name); 1619 return; 1620 } 1621 memcpy(vendor_id, &pc_buf[8], 8); 1622 memcpy(product_id, &pc_buf[16], 16); 1623 memcpy(fw_rev, &pc_buf[32], 4); 1624 1625 ide_fixstring(vendor_id, 8, 0); 1626 ide_fixstring(product_id, 16, 0); 1627 ide_fixstring(fw_rev, 4, 0); 1628 1629 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1630 drive->name, tape->name, vendor_id, product_id, fw_rev); 1631} 1632 1633/* 1634 * Ask the tape about its various parameters. In particular, we will adjust our 1635 * data transfer buffer size to the recommended value as returned by the tape. 1636 */ 1637static void idetape_get_mode_sense_results(ide_drive_t *drive) 1638{ 1639 idetape_tape_t *tape = drive->driver_data; 1640 struct ide_atapi_pc pc; 1641 u8 buf[24], *caps; 1642 u8 speed, max_speed; 1643 1644 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1645 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1646 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1647 " some default values\n"); 1648 tape->blk_size = 512; 1649 put_unaligned(52, (u16 *)&tape->caps[12]); 1650 put_unaligned(540, (u16 *)&tape->caps[14]); 1651 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1652 return; 1653 } 1654 caps = buf + 4 + buf[3]; 1655 1656 /* convert to host order and save for later use */ 1657 speed = be16_to_cpup((__be16 *)&caps[14]); 1658 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1659 1660 *(u16 *)&caps[8] = max_speed; 1661 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1662 *(u16 *)&caps[14] = speed; 1663 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1664 1665 if (!speed) { 1666 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1667 "(assuming 650KB/sec)\n", drive->name); 1668 *(u16 *)&caps[14] = 650; 1669 } 1670 if (!max_speed) { 1671 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1672 "(assuming 650KB/sec)\n", drive->name); 1673 *(u16 *)&caps[8] = 650; 1674 } 1675 1676 memcpy(&tape->caps, caps, 20); 1677 1678 /* device lacks locking support according to capabilities page */ 1679 if ((caps[6] & 1) == 0) 1680 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1681 1682 if (caps[7] & 0x02) 1683 tape->blk_size = 512; 1684 else if (caps[7] & 0x04) 1685 tape->blk_size = 1024; 1686} 1687 1688#ifdef CONFIG_IDE_PROC_FS 1689#define ide_tape_devset_get(name, field) \ 1690static int get_##name(ide_drive_t *drive) \ 1691{ \ 1692 idetape_tape_t *tape = drive->driver_data; \ 1693 return tape->field; \ 1694} 1695 1696#define ide_tape_devset_set(name, field) \ 1697static int set_##name(ide_drive_t *drive, int arg) \ 1698{ \ 1699 idetape_tape_t *tape = drive->driver_data; \ 1700 tape->field = arg; \ 1701 return 0; \ 1702} 1703 1704#define ide_tape_devset_rw_field(_name, _field) \ 1705ide_tape_devset_get(_name, _field) \ 1706ide_tape_devset_set(_name, _field) \ 1707IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1708 1709#define ide_tape_devset_r_field(_name, _field) \ 1710ide_tape_devset_get(_name, _field) \ 1711IDE_DEVSET(_name, 0, get_##_name, NULL) 1712 1713static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1714static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1715static int divf_buffer(ide_drive_t *drive) { return 2; } 1716static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1717 1718ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1719 1720ide_tape_devset_rw_field(debug_mask, debug_mask); 1721ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1722 1723ide_tape_devset_r_field(avg_speed, avg_speed); 1724ide_tape_devset_r_field(speed, caps[14]); 1725ide_tape_devset_r_field(buffer, caps[16]); 1726ide_tape_devset_r_field(buffer_size, buffer_size); 1727 1728static const struct ide_proc_devset idetape_settings[] = { 1729 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1730 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1731 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1732 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1733 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1734 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1735 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1736 mulf_tdsc, divf_tdsc), 1737 { NULL }, 1738}; 1739#endif 1740 1741/* 1742 * The function below is called to: 1743 * 1744 * 1. Initialize our various state variables. 1745 * 2. Ask the tape for its capabilities. 1746 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1747 * is chosen based on the recommendation which we received in step 2. 1748 * 1749 * Note that at this point ide.c already assigned us an irq, so that we can 1750 * queue requests here and wait for their completion. 1751 */ 1752static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1753{ 1754 unsigned long t; 1755 int speed; 1756 int buffer_size; 1757 u16 *ctl = (u16 *)&tape->caps[12]; 1758 1759 drive->pc_callback = ide_tape_callback; 1760 1761 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1762 1763 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1764 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1765 tape->name); 1766 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1767 } 1768 1769 /* Seagate Travan drives do not support DSC overlap. */ 1770 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1771 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1772 1773 tape->minor = minor; 1774 tape->name[0] = 'h'; 1775 tape->name[1] = 't'; 1776 tape->name[2] = '0' + minor; 1777 tape->chrdev_dir = IDETAPE_DIR_NONE; 1778 1779 idetape_get_inquiry_results(drive); 1780 idetape_get_mode_sense_results(drive); 1781 ide_tape_get_bsize_from_bdesc(drive); 1782 tape->user_bs_factor = 1; 1783 tape->buffer_size = *ctl * tape->blk_size; 1784 while (tape->buffer_size > 0xffff) { 1785 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1786 *ctl /= 2; 1787 tape->buffer_size = *ctl * tape->blk_size; 1788 } 1789 buffer_size = tape->buffer_size; 1790 1791 /* select the "best" DSC read/write polling freq */ 1792 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1793 1794 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1795 1796 /* 1797 * Ensure that the number we got makes sense; limit it within 1798 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1799 */ 1800 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1801 IDETAPE_DSC_RW_MAX); 1802 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1803 "%lums tDSC%s\n", 1804 drive->name, tape->name, *(u16 *)&tape->caps[14], 1805 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1806 tape->buffer_size / 1024, 1807 tape->best_dsc_rw_freq * 1000 / HZ, 1808 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1809 1810 ide_proc_register_driver(drive, tape->driver); 1811} 1812 1813static void ide_tape_remove(ide_drive_t *drive) 1814{ 1815 idetape_tape_t *tape = drive->driver_data; 1816 1817 ide_proc_unregister_driver(drive, tape->driver); 1818 device_del(&tape->dev); 1819 ide_unregister_region(tape->disk); 1820 1821 mutex_lock(&idetape_ref_mutex); 1822 put_device(&tape->dev); 1823 mutex_unlock(&idetape_ref_mutex); 1824} 1825 1826static void ide_tape_release(struct device *dev) 1827{ 1828 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1829 ide_drive_t *drive = tape->drive; 1830 struct gendisk *g = tape->disk; 1831 1832 BUG_ON(tape->valid); 1833 1834 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1835 drive->driver_data = NULL; 1836 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1837 device_destroy(idetape_sysfs_class, 1838 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1839 idetape_devs[tape->minor] = NULL; 1840 g->private_data = NULL; 1841 put_disk(g); 1842 kfree(tape); 1843} 1844 1845#ifdef CONFIG_IDE_PROC_FS 1846static int proc_idetape_read_name 1847 (char *page, char **start, off_t off, int count, int *eof, void *data) 1848{ 1849 ide_drive_t *drive = (ide_drive_t *) data; 1850 idetape_tape_t *tape = drive->driver_data; 1851 char *out = page; 1852 int len; 1853 1854 len = sprintf(out, "%s\n", tape->name); 1855 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1856} 1857 1858static ide_proc_entry_t idetape_proc[] = { 1859 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1860 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1861 { NULL, 0, NULL, NULL } 1862}; 1863 1864static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1865{ 1866 return idetape_proc; 1867} 1868 1869static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1870{ 1871 return idetape_settings; 1872} 1873#endif 1874 1875static int ide_tape_probe(ide_drive_t *); 1876 1877static struct ide_driver idetape_driver = { 1878 .gen_driver = { 1879 .owner = THIS_MODULE, 1880 .name = "ide-tape", 1881 .bus = &ide_bus_type, 1882 }, 1883 .probe = ide_tape_probe, 1884 .remove = ide_tape_remove, 1885 .version = IDETAPE_VERSION, 1886 .do_request = idetape_do_request, 1887#ifdef CONFIG_IDE_PROC_FS 1888 .proc_entries = ide_tape_proc_entries, 1889 .proc_devsets = ide_tape_proc_devsets, 1890#endif 1891}; 1892 1893/* Our character device supporting functions, passed to register_chrdev. */ 1894static const struct file_operations idetape_fops = { 1895 .owner = THIS_MODULE, 1896 .read = idetape_chrdev_read, 1897 .write = idetape_chrdev_write, 1898 .ioctl = idetape_chrdev_ioctl, 1899 .open = idetape_chrdev_open, 1900 .release = idetape_chrdev_release, 1901}; 1902 1903static int idetape_open(struct block_device *bdev, fmode_t mode) 1904{ 1905 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1906 1907 if (!tape) 1908 return -ENXIO; 1909 1910 return 0; 1911} 1912 1913static int idetape_release(struct gendisk *disk, fmode_t mode) 1914{ 1915 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1916 1917 ide_tape_put(tape); 1918 return 0; 1919} 1920 1921static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1922 unsigned int cmd, unsigned long arg) 1923{ 1924 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1925 ide_drive_t *drive = tape->drive; 1926 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1927 if (err == -EINVAL) 1928 err = idetape_blkdev_ioctl(drive, cmd, arg); 1929 return err; 1930} 1931 1932static struct block_device_operations idetape_block_ops = { 1933 .owner = THIS_MODULE, 1934 .open = idetape_open, 1935 .release = idetape_release, 1936 .locked_ioctl = idetape_ioctl, 1937}; 1938 1939static int ide_tape_probe(ide_drive_t *drive) 1940{ 1941 idetape_tape_t *tape; 1942 struct gendisk *g; 1943 int minor; 1944 1945 if (!strstr("ide-tape", drive->driver_req)) 1946 goto failed; 1947 1948 if (drive->media != ide_tape) 1949 goto failed; 1950 1951 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 1952 ide_check_atapi_device(drive, DRV_NAME) == 0) { 1953 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 1954 " the driver\n", drive->name); 1955 goto failed; 1956 } 1957 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 1958 if (tape == NULL) { 1959 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 1960 drive->name); 1961 goto failed; 1962 } 1963 1964 g = alloc_disk(1 << PARTN_BITS); 1965 if (!g) 1966 goto out_free_tape; 1967 1968 ide_init_disk(g, drive); 1969 1970 tape->dev.parent = &drive->gendev; 1971 tape->dev.release = ide_tape_release; 1972 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 1973 1974 if (device_register(&tape->dev)) 1975 goto out_free_disk; 1976 1977 tape->drive = drive; 1978 tape->driver = &idetape_driver; 1979 tape->disk = g; 1980 1981 g->private_data = &tape->driver; 1982 1983 drive->driver_data = tape; 1984 1985 mutex_lock(&idetape_ref_mutex); 1986 for (minor = 0; idetape_devs[minor]; minor++) 1987 ; 1988 idetape_devs[minor] = tape; 1989 mutex_unlock(&idetape_ref_mutex); 1990 1991 idetape_setup(drive, tape, minor); 1992 1993 device_create(idetape_sysfs_class, &drive->gendev, 1994 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 1995 device_create(idetape_sysfs_class, &drive->gendev, 1996 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 1997 "n%s", tape->name); 1998 1999 g->fops = &idetape_block_ops; 2000 ide_register_region(g); 2001 2002 return 0; 2003 2004out_free_disk: 2005 put_disk(g); 2006out_free_tape: 2007 kfree(tape); 2008failed: 2009 return -ENODEV; 2010} 2011 2012static void __exit idetape_exit(void) 2013{ 2014 driver_unregister(&idetape_driver.gen_driver); 2015 class_destroy(idetape_sysfs_class); 2016 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2017} 2018 2019static int __init idetape_init(void) 2020{ 2021 int error = 1; 2022 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2023 if (IS_ERR(idetape_sysfs_class)) { 2024 idetape_sysfs_class = NULL; 2025 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2026 error = -EBUSY; 2027 goto out; 2028 } 2029 2030 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2031 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2032 " interface\n"); 2033 error = -EBUSY; 2034 goto out_free_class; 2035 } 2036 2037 error = driver_register(&idetape_driver.gen_driver); 2038 if (error) 2039 goto out_free_driver; 2040 2041 return 0; 2042 2043out_free_driver: 2044 driver_unregister(&idetape_driver.gen_driver); 2045out_free_class: 2046 class_destroy(idetape_sysfs_class); 2047out: 2048 return error; 2049} 2050 2051MODULE_ALIAS("ide:*m-tape*"); 2052module_init(idetape_init); 2053module_exit(idetape_exit); 2054MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2055MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2056MODULE_LICENSE("GPL"); 2057