ide-tape.c revision 71294cf93d22ceaa75448cc6ebee2c65897be8c2
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->bh = NULL; 595 pc->buf = NULL; 596 pc->buf_size = length * tape->blk_size; 597 pc->req_xfer = pc->buf_size; 598 if (pc->req_xfer == tape->buffer_size) 599 pc->flags |= PC_FLAG_DMA_OK; 600 601 if (opcode == READ_6) 602 pc->c[0] = READ_6; 603 else if (opcode == WRITE_6) { 604 pc->c[0] = WRITE_6; 605 pc->flags |= PC_FLAG_WRITING; 606 } 607 608 memcpy(rq->cmd, pc->c, 12); 609} 610 611static ide_startstop_t idetape_do_request(ide_drive_t *drive, 612 struct request *rq, sector_t block) 613{ 614 ide_hwif_t *hwif = drive->hwif; 615 idetape_tape_t *tape = drive->driver_data; 616 struct ide_atapi_pc *pc = NULL; 617 struct request *postponed_rq = tape->postponed_rq; 618 struct ide_cmd cmd; 619 u8 stat; 620 621 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n" 622 (unsigned long long)rq->sector, rq->nr_sectors); 623 624 if (!(blk_special_request(rq) || blk_sense_request(rq))) { 625 /* We do not support buffer cache originated requests. */ 626 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 627 "request queue (%d)\n", drive->name, rq->cmd_type); 628 if (blk_fs_request(rq) == 0 && rq->errors == 0) 629 rq->errors = -EIO; 630 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); 631 return ide_stopped; 632 } 633 634 /* Retry a failed packet command */ 635 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 636 pc = drive->failed_pc; 637 goto out; 638 } 639 640 if (postponed_rq != NULL) 641 if (rq != postponed_rq) { 642 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 643 "Two DSC requests were queued\n"); 644 drive->failed_pc = NULL; 645 rq->errors = 0; 646 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 647 return ide_stopped; 648 } 649 650 tape->postponed_rq = NULL; 651 652 /* 653 * If the tape is still busy, postpone our request and service 654 * the other device meanwhile. 655 */ 656 stat = hwif->tp_ops->read_status(hwif); 657 658 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 659 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 660 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 661 662 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 663 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 664 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 665 } 666 667 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && 668 (stat & ATA_DSC) == 0) { 669 if (postponed_rq == NULL) { 670 tape->dsc_polling_start = jiffies; 671 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 672 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 673 } else if (time_after(jiffies, tape->dsc_timeout)) { 674 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 675 tape->name); 676 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 677 idetape_media_access_finished(drive); 678 return ide_stopped; 679 } else { 680 return ide_do_reset(drive); 681 } 682 } else if (time_after(jiffies, 683 tape->dsc_polling_start + 684 IDETAPE_DSC_MA_THRESHOLD)) 685 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 686 idetape_postpone_request(drive); 687 return ide_stopped; 688 } 689 if (rq->cmd[13] & REQ_IDETAPE_READ) { 690 pc = &tape->queued_pc; 691 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 692 goto out; 693 } 694 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 695 pc = &tape->queued_pc; 696 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 697 goto out; 698 } 699 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 700 pc = (struct ide_atapi_pc *)rq->special; 701 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 702 rq->cmd[13] |= REQ_IDETAPE_PC2; 703 goto out; 704 } 705 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 706 idetape_media_access_finished(drive); 707 return ide_stopped; 708 } 709 BUG(); 710 711out: 712 /* prepare sense request for this command */ 713 ide_prep_sense(drive, rq); 714 715 memset(&cmd, 0, sizeof(cmd)); 716 717 if (rq_data_dir(rq)) 718 cmd.tf_flags |= IDE_TFLAG_WRITE; 719 720 cmd.rq = rq; 721 722 ide_init_sg_cmd(&cmd, pc->req_xfer); 723 ide_map_sg(drive, &cmd); 724 725 return ide_tape_issue_pc(drive, &cmd, pc); 726} 727 728/* 729 * Write a filemark if write_filemark=1. Flush the device buffers without 730 * writing a filemark otherwise. 731 */ 732static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 733 struct ide_atapi_pc *pc, int write_filemark) 734{ 735 ide_init_pc(pc); 736 pc->c[0] = WRITE_FILEMARKS; 737 pc->c[4] = write_filemark; 738 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 739} 740 741static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 742{ 743 idetape_tape_t *tape = drive->driver_data; 744 struct gendisk *disk = tape->disk; 745 int load_attempted = 0; 746 747 /* Wait for the tape to become ready */ 748 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 749 timeout += jiffies; 750 while (time_before(jiffies, timeout)) { 751 if (ide_do_test_unit_ready(drive, disk) == 0) 752 return 0; 753 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 754 || (tape->asc == 0x3A)) { 755 /* no media */ 756 if (load_attempted) 757 return -ENOMEDIUM; 758 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 759 load_attempted = 1; 760 /* not about to be ready */ 761 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 762 (tape->ascq == 1 || tape->ascq == 8))) 763 return -EIO; 764 msleep(100); 765 } 766 return -EIO; 767} 768 769static int idetape_flush_tape_buffers(ide_drive_t *drive) 770{ 771 struct ide_tape_obj *tape = drive->driver_data; 772 struct ide_atapi_pc pc; 773 int rc; 774 775 idetape_create_write_filemark_cmd(drive, &pc, 0); 776 rc = ide_queue_pc_tail(drive, tape->disk, &pc); 777 if (rc) 778 return rc; 779 idetape_wait_ready(drive, 60 * 5 * HZ); 780 return 0; 781} 782 783static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 784{ 785 ide_init_pc(pc); 786 pc->c[0] = READ_POSITION; 787 pc->req_xfer = 20; 788} 789 790static int idetape_read_position(ide_drive_t *drive) 791{ 792 idetape_tape_t *tape = drive->driver_data; 793 struct ide_atapi_pc pc; 794 int position; 795 796 debug_log(DBG_PROCS, "Enter %s\n", __func__); 797 798 idetape_create_read_position_cmd(&pc); 799 if (ide_queue_pc_tail(drive, tape->disk, &pc)) 800 return -1; 801 position = tape->first_frame; 802 return position; 803} 804 805static void idetape_create_locate_cmd(ide_drive_t *drive, 806 struct ide_atapi_pc *pc, 807 unsigned int block, u8 partition, int skip) 808{ 809 ide_init_pc(pc); 810 pc->c[0] = POSITION_TO_ELEMENT; 811 pc->c[1] = 2; 812 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 813 pc->c[8] = partition; 814 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 815} 816 817static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 818{ 819 idetape_tape_t *tape = drive->driver_data; 820 821 if (tape->chrdev_dir != IDETAPE_DIR_READ) 822 return; 823 824 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 825 tape->valid = 0; 826 if (tape->buf != NULL) { 827 kfree(tape->buf); 828 tape->buf = NULL; 829 } 830 831 tape->chrdev_dir = IDETAPE_DIR_NONE; 832} 833 834/* 835 * Position the tape to the requested block using the LOCATE packet command. 836 * A READ POSITION command is then issued to check where we are positioned. Like 837 * all higher level operations, we queue the commands at the tail of the request 838 * queue and wait for their completion. 839 */ 840static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 841 u8 partition, int skip) 842{ 843 idetape_tape_t *tape = drive->driver_data; 844 struct gendisk *disk = tape->disk; 845 int retval; 846 struct ide_atapi_pc pc; 847 848 if (tape->chrdev_dir == IDETAPE_DIR_READ) 849 __ide_tape_discard_merge_buffer(drive); 850 idetape_wait_ready(drive, 60 * 5 * HZ); 851 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 852 retval = ide_queue_pc_tail(drive, disk, &pc); 853 if (retval) 854 return (retval); 855 856 idetape_create_read_position_cmd(&pc); 857 return ide_queue_pc_tail(drive, disk, &pc); 858} 859 860static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 861 int restore_position) 862{ 863 idetape_tape_t *tape = drive->driver_data; 864 int seek, position; 865 866 __ide_tape_discard_merge_buffer(drive); 867 if (restore_position) { 868 position = idetape_read_position(drive); 869 seek = position > 0 ? position : 0; 870 if (idetape_position_tape(drive, seek, 0, 0)) { 871 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 872 " %s\n", tape->name, __func__); 873 return; 874 } 875 } 876} 877 878/* 879 * Generate a read/write request for the block device interface and wait for it 880 * to be serviced. 881 */ 882static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 883{ 884 idetape_tape_t *tape = drive->driver_data; 885 struct request *rq; 886 int ret; 887 888 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 889 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 890 BUG_ON(size < 0 || size % tape->blk_size); 891 892 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 893 rq->cmd_type = REQ_TYPE_SPECIAL; 894 rq->cmd[13] = cmd; 895 rq->rq_disk = tape->disk; 896 rq->sector = tape->first_frame; 897 898 if (size) { 899 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 900 __GFP_WAIT); 901 if (ret) 902 goto out_put; 903 } 904 905 blk_execute_rq(drive->queue, tape->disk, rq, 0); 906 907 /* calculate the number of transferred bytes and update buffer state */ 908 size -= rq->data_len; 909 tape->cur = tape->buf; 910 if (cmd == REQ_IDETAPE_READ) 911 tape->valid = size; 912 else 913 tape->valid = 0; 914 915 ret = size; 916 if (rq->errors == IDE_DRV_ERROR_GENERAL) 917 ret = -EIO; 918out_put: 919 blk_put_request(rq); 920 return ret; 921} 922 923static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 924{ 925 ide_init_pc(pc); 926 pc->c[0] = INQUIRY; 927 pc->c[4] = 254; 928 pc->req_xfer = 254; 929} 930 931static void idetape_create_rewind_cmd(ide_drive_t *drive, 932 struct ide_atapi_pc *pc) 933{ 934 ide_init_pc(pc); 935 pc->c[0] = REZERO_UNIT; 936 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 937} 938 939static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 940{ 941 ide_init_pc(pc); 942 pc->c[0] = ERASE; 943 pc->c[1] = 1; 944 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 945} 946 947static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 948{ 949 ide_init_pc(pc); 950 pc->c[0] = SPACE; 951 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 952 pc->c[1] = cmd; 953 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 954} 955 956/* Queue up a character device originated write request. */ 957static int idetape_add_chrdev_write_request(ide_drive_t *drive, int size) 958{ 959 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 960 961 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, size); 962} 963 964static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 965{ 966 idetape_tape_t *tape = drive->driver_data; 967 968 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 969 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 970 " but we are not writing.\n"); 971 return; 972 } 973 if (tape->buf) { 974 size_t aligned = roundup(tape->valid, tape->blk_size); 975 976 memset(tape->cur, 0, aligned - tape->valid); 977 idetape_add_chrdev_write_request(drive, aligned); 978 kfree(tape->buf); 979 tape->buf = NULL; 980 } 981 tape->chrdev_dir = IDETAPE_DIR_NONE; 982} 983 984static int idetape_init_rw(ide_drive_t *drive, int dir) 985{ 986 idetape_tape_t *tape = drive->driver_data; 987 int rc; 988 989 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 990 991 if (tape->chrdev_dir == dir) 992 return 0; 993 994 if (tape->chrdev_dir == IDETAPE_DIR_READ) 995 ide_tape_discard_merge_buffer(drive, 1); 996 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 997 ide_tape_flush_merge_buffer(drive); 998 idetape_flush_tape_buffers(drive); 999 } 1000 1001 if (tape->buf || tape->valid) { 1002 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 1003 tape->valid = 0; 1004 } 1005 1006 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1007 if (!tape->buf) 1008 return -ENOMEM; 1009 tape->chrdev_dir = dir; 1010 tape->cur = tape->buf; 1011 1012 /* 1013 * Issue a 0 rw command to ensure that DSC handshake is 1014 * switched from completion mode to buffer available mode. No 1015 * point in issuing this if DSC overlap isn't supported, some 1016 * drives (Seagate STT3401A) will return an error. 1017 */ 1018 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1019 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 1020 : REQ_IDETAPE_WRITE; 1021 1022 rc = idetape_queue_rw_tail(drive, cmd, 0); 1023 if (rc < 0) { 1024 kfree(tape->buf); 1025 tape->buf = NULL; 1026 tape->chrdev_dir = IDETAPE_DIR_NONE; 1027 return rc; 1028 } 1029 } 1030 1031 return 0; 1032} 1033 1034/* called from idetape_chrdev_read() to service a chrdev read request. */ 1035static int idetape_add_chrdev_read_request(ide_drive_t *drive, int size) 1036{ 1037 debug_log(DBG_PROCS, "Enter %s, %d bytes\n", __func__, size); 1038 1039 /* If we are at a filemark, return a read length of 0 */ 1040 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1041 return 0; 1042 1043 idetape_init_rw(drive, IDETAPE_DIR_READ); 1044 1045 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, size); 1046} 1047 1048static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1049{ 1050 idetape_tape_t *tape = drive->driver_data; 1051 1052 memset(tape->buf, 0, tape->buffer_size); 1053 1054 while (bcount) { 1055 unsigned int count = min(tape->buffer_size, bcount); 1056 1057 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1058 bcount -= count; 1059 } 1060} 1061 1062/* 1063 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1064 * currently support only one partition. 1065 */ 1066static int idetape_rewind_tape(ide_drive_t *drive) 1067{ 1068 struct ide_tape_obj *tape = drive->driver_data; 1069 struct gendisk *disk = tape->disk; 1070 int retval; 1071 struct ide_atapi_pc pc; 1072 1073 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1074 1075 idetape_create_rewind_cmd(drive, &pc); 1076 retval = ide_queue_pc_tail(drive, disk, &pc); 1077 if (retval) 1078 return retval; 1079 1080 idetape_create_read_position_cmd(&pc); 1081 retval = ide_queue_pc_tail(drive, disk, &pc); 1082 if (retval) 1083 return retval; 1084 return 0; 1085} 1086 1087/* mtio.h compatible commands should be issued to the chrdev interface. */ 1088static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1089 unsigned long arg) 1090{ 1091 idetape_tape_t *tape = drive->driver_data; 1092 void __user *argp = (void __user *)arg; 1093 1094 struct idetape_config { 1095 int dsc_rw_frequency; 1096 int dsc_media_access_frequency; 1097 int nr_stages; 1098 } config; 1099 1100 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1101 1102 switch (cmd) { 1103 case 0x0340: 1104 if (copy_from_user(&config, argp, sizeof(config))) 1105 return -EFAULT; 1106 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1107 break; 1108 case 0x0350: 1109 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1110 config.nr_stages = 1; 1111 if (copy_to_user(argp, &config, sizeof(config))) 1112 return -EFAULT; 1113 break; 1114 default: 1115 return -EIO; 1116 } 1117 return 0; 1118} 1119 1120static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1121 int mt_count) 1122{ 1123 idetape_tape_t *tape = drive->driver_data; 1124 struct gendisk *disk = tape->disk; 1125 struct ide_atapi_pc pc; 1126 int retval, count = 0; 1127 int sprev = !!(tape->caps[4] & 0x20); 1128 1129 if (mt_count == 0) 1130 return 0; 1131 if (MTBSF == mt_op || MTBSFM == mt_op) { 1132 if (!sprev) 1133 return -EIO; 1134 mt_count = -mt_count; 1135 } 1136 1137 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1138 tape->valid = 0; 1139 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1140 ++count; 1141 ide_tape_discard_merge_buffer(drive, 0); 1142 } 1143 1144 switch (mt_op) { 1145 case MTFSF: 1146 case MTBSF: 1147 idetape_create_space_cmd(&pc, mt_count - count, 1148 IDETAPE_SPACE_OVER_FILEMARK); 1149 return ide_queue_pc_tail(drive, disk, &pc); 1150 case MTFSFM: 1151 case MTBSFM: 1152 if (!sprev) 1153 return -EIO; 1154 retval = idetape_space_over_filemarks(drive, MTFSF, 1155 mt_count - count); 1156 if (retval) 1157 return retval; 1158 count = (MTBSFM == mt_op ? 1 : -1); 1159 return idetape_space_over_filemarks(drive, MTFSF, count); 1160 default: 1161 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1162 mt_op); 1163 return -EIO; 1164 } 1165} 1166 1167/* 1168 * Our character device read / write functions. 1169 * 1170 * The tape is optimized to maximize throughput when it is transferring an 1171 * integral number of the "continuous transfer limit", which is a parameter of 1172 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1173 * 1174 * As of version 1.3 of the driver, the character device provides an abstract 1175 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1176 * same backup/restore procedure is supported. The driver will internally 1177 * convert the requests to the recommended transfer unit, so that an unmatch 1178 * between the user's block size to the recommended size will only result in a 1179 * (slightly) increased driver overhead, but will no longer hit performance. 1180 * This is not applicable to Onstream. 1181 */ 1182static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1183 size_t count, loff_t *ppos) 1184{ 1185 struct ide_tape_obj *tape = file->private_data; 1186 ide_drive_t *drive = tape->drive; 1187 ssize_t bytes_read, temp, actually_read = 0, rc; 1188 ssize_t ret = 0; 1189 1190 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1191 1192 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1193 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1194 if (count > tape->blk_size && 1195 (count % tape->blk_size) == 0) 1196 tape->user_bs_factor = count / tape->blk_size; 1197 } 1198 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1199 if (rc < 0) 1200 return rc; 1201 if (count == 0) 1202 return (0); 1203 if (tape->valid) { 1204 actually_read = min_t(unsigned int, tape->valid, count); 1205 if (copy_to_user(buf, tape->cur, actually_read)) 1206 ret = -EFAULT; 1207 buf += actually_read; 1208 count -= actually_read; 1209 tape->cur += actually_read; 1210 tape->valid -= actually_read; 1211 } 1212 while (count >= tape->buffer_size) { 1213 bytes_read = idetape_add_chrdev_read_request(drive, 1214 tape->buffer_size); 1215 if (bytes_read <= 0) 1216 goto finish; 1217 if (copy_to_user(buf, tape->cur, bytes_read)) 1218 ret = -EFAULT; 1219 buf += bytes_read; 1220 count -= bytes_read; 1221 actually_read += bytes_read; 1222 } 1223 if (count) { 1224 bytes_read = idetape_add_chrdev_read_request(drive, 1225 tape->buffer_size); 1226 if (bytes_read <= 0) 1227 goto finish; 1228 temp = min((unsigned long)count, (unsigned long)bytes_read); 1229 if (copy_to_user(buf, tape->cur, temp)) 1230 ret = -EFAULT; 1231 actually_read += temp; 1232 tape->cur += temp; 1233 tape->valid -= temp; 1234 } 1235finish: 1236 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1237 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1238 1239 idetape_space_over_filemarks(drive, MTFSF, 1); 1240 return 0; 1241 } 1242 1243 return ret ? ret : actually_read; 1244} 1245 1246static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1247 size_t count, loff_t *ppos) 1248{ 1249 struct ide_tape_obj *tape = file->private_data; 1250 ide_drive_t *drive = tape->drive; 1251 ssize_t actually_written = 0; 1252 ssize_t ret = 0; 1253 int rc; 1254 1255 /* The drive is write protected. */ 1256 if (tape->write_prot) 1257 return -EACCES; 1258 1259 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1260 1261 /* Initialize write operation */ 1262 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1263 if (rc < 0) 1264 return rc; 1265 if (count == 0) 1266 return (0); 1267 if (tape->valid < tape->buffer_size) { 1268 actually_written = min_t(unsigned int, 1269 tape->buffer_size - tape->valid, 1270 count); 1271 if (copy_from_user(tape->cur, buf, actually_written)) 1272 ret = -EFAULT; 1273 buf += actually_written; 1274 count -= actually_written; 1275 tape->cur += actually_written; 1276 tape->valid += actually_written; 1277 1278 if (tape->valid == tape->buffer_size) { 1279 ssize_t retval; 1280 retval = idetape_add_chrdev_write_request(drive, 1281 tape->buffer_size); 1282 if (retval <= 0) 1283 return (retval); 1284 } 1285 } 1286 while (count >= tape->buffer_size) { 1287 ssize_t retval; 1288 if (copy_from_user(tape->cur, buf, tape->buffer_size)) 1289 ret = -EFAULT; 1290 buf += tape->buffer_size; 1291 count -= tape->buffer_size; 1292 retval = idetape_add_chrdev_write_request(drive, 1293 tape->buffer_size); 1294 actually_written += tape->buffer_size; 1295 if (retval <= 0) 1296 return (retval); 1297 } 1298 if (count) { 1299 actually_written += count; 1300 if (copy_from_user(tape->cur, buf, count)) 1301 ret = -EFAULT; 1302 tape->cur += count; 1303 tape->valid += count; 1304 } 1305 return ret ? ret : actually_written; 1306} 1307 1308static int idetape_write_filemark(ide_drive_t *drive) 1309{ 1310 struct ide_tape_obj *tape = drive->driver_data; 1311 struct ide_atapi_pc pc; 1312 1313 /* Write a filemark */ 1314 idetape_create_write_filemark_cmd(drive, &pc, 1); 1315 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1316 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1317 return -EIO; 1318 } 1319 return 0; 1320} 1321 1322/* 1323 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1324 * requested. 1325 * 1326 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1327 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1328 * usually not supported. 1329 * 1330 * The following commands are currently not supported: 1331 * 1332 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1333 * MT_ST_WRITE_THRESHOLD. 1334 */ 1335static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1336{ 1337 idetape_tape_t *tape = drive->driver_data; 1338 struct gendisk *disk = tape->disk; 1339 struct ide_atapi_pc pc; 1340 int i, retval; 1341 1342 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1343 mt_op, mt_count); 1344 1345 switch (mt_op) { 1346 case MTFSF: 1347 case MTFSFM: 1348 case MTBSF: 1349 case MTBSFM: 1350 if (!mt_count) 1351 return 0; 1352 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1353 default: 1354 break; 1355 } 1356 1357 switch (mt_op) { 1358 case MTWEOF: 1359 if (tape->write_prot) 1360 return -EACCES; 1361 ide_tape_discard_merge_buffer(drive, 1); 1362 for (i = 0; i < mt_count; i++) { 1363 retval = idetape_write_filemark(drive); 1364 if (retval) 1365 return retval; 1366 } 1367 return 0; 1368 case MTREW: 1369 ide_tape_discard_merge_buffer(drive, 0); 1370 if (idetape_rewind_tape(drive)) 1371 return -EIO; 1372 return 0; 1373 case MTLOAD: 1374 ide_tape_discard_merge_buffer(drive, 0); 1375 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1376 case MTUNLOAD: 1377 case MTOFFL: 1378 /* 1379 * If door is locked, attempt to unlock before 1380 * attempting to eject. 1381 */ 1382 if (tape->door_locked) { 1383 if (!ide_set_media_lock(drive, disk, 0)) 1384 tape->door_locked = DOOR_UNLOCKED; 1385 } 1386 ide_tape_discard_merge_buffer(drive, 0); 1387 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1388 if (!retval) 1389 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1390 return retval; 1391 case MTNOP: 1392 ide_tape_discard_merge_buffer(drive, 0); 1393 return idetape_flush_tape_buffers(drive); 1394 case MTRETEN: 1395 ide_tape_discard_merge_buffer(drive, 0); 1396 return ide_do_start_stop(drive, disk, 1397 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1398 case MTEOM: 1399 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1400 return ide_queue_pc_tail(drive, disk, &pc); 1401 case MTERASE: 1402 (void)idetape_rewind_tape(drive); 1403 idetape_create_erase_cmd(&pc); 1404 return ide_queue_pc_tail(drive, disk, &pc); 1405 case MTSETBLK: 1406 if (mt_count) { 1407 if (mt_count < tape->blk_size || 1408 mt_count % tape->blk_size) 1409 return -EIO; 1410 tape->user_bs_factor = mt_count / tape->blk_size; 1411 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1412 } else 1413 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1414 return 0; 1415 case MTSEEK: 1416 ide_tape_discard_merge_buffer(drive, 0); 1417 return idetape_position_tape(drive, 1418 mt_count * tape->user_bs_factor, tape->partition, 0); 1419 case MTSETPART: 1420 ide_tape_discard_merge_buffer(drive, 0); 1421 return idetape_position_tape(drive, 0, mt_count, 0); 1422 case MTFSR: 1423 case MTBSR: 1424 case MTLOCK: 1425 retval = ide_set_media_lock(drive, disk, 1); 1426 if (retval) 1427 return retval; 1428 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1429 return 0; 1430 case MTUNLOCK: 1431 retval = ide_set_media_lock(drive, disk, 0); 1432 if (retval) 1433 return retval; 1434 tape->door_locked = DOOR_UNLOCKED; 1435 return 0; 1436 default: 1437 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1438 mt_op); 1439 return -EIO; 1440 } 1441} 1442 1443/* 1444 * Our character device ioctls. General mtio.h magnetic io commands are 1445 * supported here, and not in the corresponding block interface. Our own 1446 * ide-tape ioctls are supported on both interfaces. 1447 */ 1448static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1449 unsigned int cmd, unsigned long arg) 1450{ 1451 struct ide_tape_obj *tape = file->private_data; 1452 ide_drive_t *drive = tape->drive; 1453 struct mtop mtop; 1454 struct mtget mtget; 1455 struct mtpos mtpos; 1456 int block_offset = 0, position = tape->first_frame; 1457 void __user *argp = (void __user *)arg; 1458 1459 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1460 1461 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1462 ide_tape_flush_merge_buffer(drive); 1463 idetape_flush_tape_buffers(drive); 1464 } 1465 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1466 block_offset = tape->valid / 1467 (tape->blk_size * tape->user_bs_factor); 1468 position = idetape_read_position(drive); 1469 if (position < 0) 1470 return -EIO; 1471 } 1472 switch (cmd) { 1473 case MTIOCTOP: 1474 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1475 return -EFAULT; 1476 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1477 case MTIOCGET: 1478 memset(&mtget, 0, sizeof(struct mtget)); 1479 mtget.mt_type = MT_ISSCSI2; 1480 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1481 mtget.mt_dsreg = 1482 ((tape->blk_size * tape->user_bs_factor) 1483 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1484 1485 if (tape->drv_write_prot) 1486 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1487 1488 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1489 return -EFAULT; 1490 return 0; 1491 case MTIOCPOS: 1492 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1493 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1494 return -EFAULT; 1495 return 0; 1496 default: 1497 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1498 ide_tape_discard_merge_buffer(drive, 1); 1499 return idetape_blkdev_ioctl(drive, cmd, arg); 1500 } 1501} 1502 1503/* 1504 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1505 * block size with the reported value. 1506 */ 1507static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1508{ 1509 idetape_tape_t *tape = drive->driver_data; 1510 struct ide_atapi_pc pc; 1511 1512 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1513 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1514 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1515 if (tape->blk_size == 0) { 1516 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1517 "block size, assuming 32k\n"); 1518 tape->blk_size = 32768; 1519 } 1520 return; 1521 } 1522 tape->blk_size = (pc.buf[4 + 5] << 16) + 1523 (pc.buf[4 + 6] << 8) + 1524 pc.buf[4 + 7]; 1525 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 1526} 1527 1528static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1529{ 1530 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1531 ide_drive_t *drive; 1532 idetape_tape_t *tape; 1533 int retval; 1534 1535 if (i >= MAX_HWIFS * MAX_DRIVES) 1536 return -ENXIO; 1537 1538 lock_kernel(); 1539 tape = ide_tape_chrdev_get(i); 1540 if (!tape) { 1541 unlock_kernel(); 1542 return -ENXIO; 1543 } 1544 1545 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1546 1547 /* 1548 * We really want to do nonseekable_open(inode, filp); here, but some 1549 * versions of tar incorrectly call lseek on tapes and bail out if that 1550 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1551 */ 1552 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1553 1554 drive = tape->drive; 1555 1556 filp->private_data = tape; 1557 1558 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1559 retval = -EBUSY; 1560 goto out_put_tape; 1561 } 1562 1563 retval = idetape_wait_ready(drive, 60 * HZ); 1564 if (retval) { 1565 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1566 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1567 goto out_put_tape; 1568 } 1569 1570 idetape_read_position(drive); 1571 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1572 (void)idetape_rewind_tape(drive); 1573 1574 /* Read block size and write protect status from drive. */ 1575 ide_tape_get_bsize_from_bdesc(drive); 1576 1577 /* Set write protect flag if device is opened as read-only. */ 1578 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1579 tape->write_prot = 1; 1580 else 1581 tape->write_prot = tape->drv_write_prot; 1582 1583 /* Make sure drive isn't write protected if user wants to write. */ 1584 if (tape->write_prot) { 1585 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1586 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1587 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1588 retval = -EROFS; 1589 goto out_put_tape; 1590 } 1591 } 1592 1593 /* Lock the tape drive door so user can't eject. */ 1594 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1595 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1596 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1597 tape->door_locked = DOOR_LOCKED; 1598 } 1599 } 1600 unlock_kernel(); 1601 return 0; 1602 1603out_put_tape: 1604 ide_tape_put(tape); 1605 unlock_kernel(); 1606 return retval; 1607} 1608 1609static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1610{ 1611 idetape_tape_t *tape = drive->driver_data; 1612 1613 ide_tape_flush_merge_buffer(drive); 1614 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1615 if (tape->buf != NULL) { 1616 idetape_pad_zeros(drive, tape->blk_size * 1617 (tape->user_bs_factor - 1)); 1618 kfree(tape->buf); 1619 tape->buf = NULL; 1620 } 1621 idetape_write_filemark(drive); 1622 idetape_flush_tape_buffers(drive); 1623 idetape_flush_tape_buffers(drive); 1624} 1625 1626static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1627{ 1628 struct ide_tape_obj *tape = filp->private_data; 1629 ide_drive_t *drive = tape->drive; 1630 unsigned int minor = iminor(inode); 1631 1632 lock_kernel(); 1633 tape = drive->driver_data; 1634 1635 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1636 1637 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1638 idetape_write_release(drive, minor); 1639 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1640 if (minor < 128) 1641 ide_tape_discard_merge_buffer(drive, 1); 1642 } 1643 1644 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1645 (void) idetape_rewind_tape(drive); 1646 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1647 if (tape->door_locked == DOOR_LOCKED) { 1648 if (!ide_set_media_lock(drive, tape->disk, 0)) 1649 tape->door_locked = DOOR_UNLOCKED; 1650 } 1651 } 1652 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1653 ide_tape_put(tape); 1654 unlock_kernel(); 1655 return 0; 1656} 1657 1658static void idetape_get_inquiry_results(ide_drive_t *drive) 1659{ 1660 idetape_tape_t *tape = drive->driver_data; 1661 struct ide_atapi_pc pc; 1662 u8 pc_buf[256]; 1663 char fw_rev[4], vendor_id[8], product_id[16]; 1664 1665 idetape_create_inquiry_cmd(&pc); 1666 pc.buf = &pc_buf[0]; 1667 pc.buf_size = sizeof(pc_buf); 1668 1669 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1670 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1671 tape->name); 1672 return; 1673 } 1674 memcpy(vendor_id, &pc.buf[8], 8); 1675 memcpy(product_id, &pc.buf[16], 16); 1676 memcpy(fw_rev, &pc.buf[32], 4); 1677 1678 ide_fixstring(vendor_id, 8, 0); 1679 ide_fixstring(product_id, 16, 0); 1680 ide_fixstring(fw_rev, 4, 0); 1681 1682 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1683 drive->name, tape->name, vendor_id, product_id, fw_rev); 1684} 1685 1686/* 1687 * Ask the tape about its various parameters. In particular, we will adjust our 1688 * data transfer buffer size to the recommended value as returned by the tape. 1689 */ 1690static void idetape_get_mode_sense_results(ide_drive_t *drive) 1691{ 1692 idetape_tape_t *tape = drive->driver_data; 1693 struct ide_atapi_pc pc; 1694 u8 *caps; 1695 u8 speed, max_speed; 1696 1697 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1698 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1699 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1700 " some default values\n"); 1701 tape->blk_size = 512; 1702 put_unaligned(52, (u16 *)&tape->caps[12]); 1703 put_unaligned(540, (u16 *)&tape->caps[14]); 1704 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1705 return; 1706 } 1707 caps = pc.buf + 4 + pc.buf[3]; 1708 1709 /* convert to host order and save for later use */ 1710 speed = be16_to_cpup((__be16 *)&caps[14]); 1711 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1712 1713 *(u16 *)&caps[8] = max_speed; 1714 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1715 *(u16 *)&caps[14] = speed; 1716 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1717 1718 if (!speed) { 1719 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1720 "(assuming 650KB/sec)\n", drive->name); 1721 *(u16 *)&caps[14] = 650; 1722 } 1723 if (!max_speed) { 1724 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1725 "(assuming 650KB/sec)\n", drive->name); 1726 *(u16 *)&caps[8] = 650; 1727 } 1728 1729 memcpy(&tape->caps, caps, 20); 1730 1731 /* device lacks locking support according to capabilities page */ 1732 if ((caps[6] & 1) == 0) 1733 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1734 1735 if (caps[7] & 0x02) 1736 tape->blk_size = 512; 1737 else if (caps[7] & 0x04) 1738 tape->blk_size = 1024; 1739} 1740 1741#ifdef CONFIG_IDE_PROC_FS 1742#define ide_tape_devset_get(name, field) \ 1743static int get_##name(ide_drive_t *drive) \ 1744{ \ 1745 idetape_tape_t *tape = drive->driver_data; \ 1746 return tape->field; \ 1747} 1748 1749#define ide_tape_devset_set(name, field) \ 1750static int set_##name(ide_drive_t *drive, int arg) \ 1751{ \ 1752 idetape_tape_t *tape = drive->driver_data; \ 1753 tape->field = arg; \ 1754 return 0; \ 1755} 1756 1757#define ide_tape_devset_rw_field(_name, _field) \ 1758ide_tape_devset_get(_name, _field) \ 1759ide_tape_devset_set(_name, _field) \ 1760IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1761 1762#define ide_tape_devset_r_field(_name, _field) \ 1763ide_tape_devset_get(_name, _field) \ 1764IDE_DEVSET(_name, 0, get_##_name, NULL) 1765 1766static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1767static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1768static int divf_buffer(ide_drive_t *drive) { return 2; } 1769static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1770 1771ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1772 1773ide_tape_devset_rw_field(debug_mask, debug_mask); 1774ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1775 1776ide_tape_devset_r_field(avg_speed, avg_speed); 1777ide_tape_devset_r_field(speed, caps[14]); 1778ide_tape_devset_r_field(buffer, caps[16]); 1779ide_tape_devset_r_field(buffer_size, buffer_size); 1780 1781static const struct ide_proc_devset idetape_settings[] = { 1782 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1783 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1784 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1785 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1786 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1787 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1788 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1789 mulf_tdsc, divf_tdsc), 1790 { NULL }, 1791}; 1792#endif 1793 1794/* 1795 * The function below is called to: 1796 * 1797 * 1. Initialize our various state variables. 1798 * 2. Ask the tape for its capabilities. 1799 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1800 * is chosen based on the recommendation which we received in step 2. 1801 * 1802 * Note that at this point ide.c already assigned us an irq, so that we can 1803 * queue requests here and wait for their completion. 1804 */ 1805static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1806{ 1807 unsigned long t; 1808 int speed; 1809 int buffer_size; 1810 u16 *ctl = (u16 *)&tape->caps[12]; 1811 1812 drive->pc_callback = ide_tape_callback; 1813 1814 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1815 1816 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1817 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1818 tape->name); 1819 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1820 } 1821 1822 /* Seagate Travan drives do not support DSC overlap. */ 1823 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1824 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1825 1826 tape->minor = minor; 1827 tape->name[0] = 'h'; 1828 tape->name[1] = 't'; 1829 tape->name[2] = '0' + minor; 1830 tape->chrdev_dir = IDETAPE_DIR_NONE; 1831 1832 idetape_get_inquiry_results(drive); 1833 idetape_get_mode_sense_results(drive); 1834 ide_tape_get_bsize_from_bdesc(drive); 1835 tape->user_bs_factor = 1; 1836 tape->buffer_size = *ctl * tape->blk_size; 1837 while (tape->buffer_size > 0xffff) { 1838 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1839 *ctl /= 2; 1840 tape->buffer_size = *ctl * tape->blk_size; 1841 } 1842 buffer_size = tape->buffer_size; 1843 1844 /* select the "best" DSC read/write polling freq */ 1845 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1846 1847 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1848 1849 /* 1850 * Ensure that the number we got makes sense; limit it within 1851 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1852 */ 1853 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1854 IDETAPE_DSC_RW_MAX); 1855 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1856 "%lums tDSC%s\n", 1857 drive->name, tape->name, *(u16 *)&tape->caps[14], 1858 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1859 tape->buffer_size / 1024, 1860 tape->best_dsc_rw_freq * 1000 / HZ, 1861 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1862 1863 ide_proc_register_driver(drive, tape->driver); 1864} 1865 1866static void ide_tape_remove(ide_drive_t *drive) 1867{ 1868 idetape_tape_t *tape = drive->driver_data; 1869 1870 ide_proc_unregister_driver(drive, tape->driver); 1871 device_del(&tape->dev); 1872 ide_unregister_region(tape->disk); 1873 1874 mutex_lock(&idetape_ref_mutex); 1875 put_device(&tape->dev); 1876 mutex_unlock(&idetape_ref_mutex); 1877} 1878 1879static void ide_tape_release(struct device *dev) 1880{ 1881 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1882 ide_drive_t *drive = tape->drive; 1883 struct gendisk *g = tape->disk; 1884 1885 BUG_ON(tape->valid); 1886 1887 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1888 drive->driver_data = NULL; 1889 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1890 device_destroy(idetape_sysfs_class, 1891 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1892 idetape_devs[tape->minor] = NULL; 1893 g->private_data = NULL; 1894 put_disk(g); 1895 kfree(tape); 1896} 1897 1898#ifdef CONFIG_IDE_PROC_FS 1899static int proc_idetape_read_name 1900 (char *page, char **start, off_t off, int count, int *eof, void *data) 1901{ 1902 ide_drive_t *drive = (ide_drive_t *) data; 1903 idetape_tape_t *tape = drive->driver_data; 1904 char *out = page; 1905 int len; 1906 1907 len = sprintf(out, "%s\n", tape->name); 1908 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1909} 1910 1911static ide_proc_entry_t idetape_proc[] = { 1912 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1913 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1914 { NULL, 0, NULL, NULL } 1915}; 1916 1917static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1918{ 1919 return idetape_proc; 1920} 1921 1922static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1923{ 1924 return idetape_settings; 1925} 1926#endif 1927 1928static int ide_tape_probe(ide_drive_t *); 1929 1930static struct ide_driver idetape_driver = { 1931 .gen_driver = { 1932 .owner = THIS_MODULE, 1933 .name = "ide-tape", 1934 .bus = &ide_bus_type, 1935 }, 1936 .probe = ide_tape_probe, 1937 .remove = ide_tape_remove, 1938 .version = IDETAPE_VERSION, 1939 .do_request = idetape_do_request, 1940#ifdef CONFIG_IDE_PROC_FS 1941 .proc_entries = ide_tape_proc_entries, 1942 .proc_devsets = ide_tape_proc_devsets, 1943#endif 1944}; 1945 1946/* Our character device supporting functions, passed to register_chrdev. */ 1947static const struct file_operations idetape_fops = { 1948 .owner = THIS_MODULE, 1949 .read = idetape_chrdev_read, 1950 .write = idetape_chrdev_write, 1951 .ioctl = idetape_chrdev_ioctl, 1952 .open = idetape_chrdev_open, 1953 .release = idetape_chrdev_release, 1954}; 1955 1956static int idetape_open(struct block_device *bdev, fmode_t mode) 1957{ 1958 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1959 1960 if (!tape) 1961 return -ENXIO; 1962 1963 return 0; 1964} 1965 1966static int idetape_release(struct gendisk *disk, fmode_t mode) 1967{ 1968 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1969 1970 ide_tape_put(tape); 1971 return 0; 1972} 1973 1974static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1975 unsigned int cmd, unsigned long arg) 1976{ 1977 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1978 ide_drive_t *drive = tape->drive; 1979 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1980 if (err == -EINVAL) 1981 err = idetape_blkdev_ioctl(drive, cmd, arg); 1982 return err; 1983} 1984 1985static struct block_device_operations idetape_block_ops = { 1986 .owner = THIS_MODULE, 1987 .open = idetape_open, 1988 .release = idetape_release, 1989 .locked_ioctl = idetape_ioctl, 1990}; 1991 1992static int ide_tape_probe(ide_drive_t *drive) 1993{ 1994 idetape_tape_t *tape; 1995 struct gendisk *g; 1996 int minor; 1997 1998 if (!strstr("ide-tape", drive->driver_req)) 1999 goto failed; 2000 2001 if (drive->media != ide_tape) 2002 goto failed; 2003 2004 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 2005 ide_check_atapi_device(drive, DRV_NAME) == 0) { 2006 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 2007 " the driver\n", drive->name); 2008 goto failed; 2009 } 2010 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 2011 if (tape == NULL) { 2012 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 2013 drive->name); 2014 goto failed; 2015 } 2016 2017 g = alloc_disk(1 << PARTN_BITS); 2018 if (!g) 2019 goto out_free_tape; 2020 2021 ide_init_disk(g, drive); 2022 2023 tape->dev.parent = &drive->gendev; 2024 tape->dev.release = ide_tape_release; 2025 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 2026 2027 if (device_register(&tape->dev)) 2028 goto out_free_disk; 2029 2030 tape->drive = drive; 2031 tape->driver = &idetape_driver; 2032 tape->disk = g; 2033 2034 g->private_data = &tape->driver; 2035 2036 drive->driver_data = tape; 2037 2038 mutex_lock(&idetape_ref_mutex); 2039 for (minor = 0; idetape_devs[minor]; minor++) 2040 ; 2041 idetape_devs[minor] = tape; 2042 mutex_unlock(&idetape_ref_mutex); 2043 2044 idetape_setup(drive, tape, minor); 2045 2046 device_create(idetape_sysfs_class, &drive->gendev, 2047 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 2048 device_create(idetape_sysfs_class, &drive->gendev, 2049 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2050 "n%s", tape->name); 2051 2052 g->fops = &idetape_block_ops; 2053 ide_register_region(g); 2054 2055 return 0; 2056 2057out_free_disk: 2058 put_disk(g); 2059out_free_tape: 2060 kfree(tape); 2061failed: 2062 return -ENODEV; 2063} 2064 2065static void __exit idetape_exit(void) 2066{ 2067 driver_unregister(&idetape_driver.gen_driver); 2068 class_destroy(idetape_sysfs_class); 2069 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2070} 2071 2072static int __init idetape_init(void) 2073{ 2074 int error = 1; 2075 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2076 if (IS_ERR(idetape_sysfs_class)) { 2077 idetape_sysfs_class = NULL; 2078 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2079 error = -EBUSY; 2080 goto out; 2081 } 2082 2083 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2084 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2085 " interface\n"); 2086 error = -EBUSY; 2087 goto out_free_class; 2088 } 2089 2090 error = driver_register(&idetape_driver.gen_driver); 2091 if (error) 2092 goto out_free_driver; 2093 2094 return 0; 2095 2096out_free_driver: 2097 driver_unregister(&idetape_driver.gen_driver); 2098out_free_class: 2099 class_destroy(idetape_sysfs_class); 2100out: 2101 return error; 2102} 2103 2104MODULE_ALIAS("ide:*m-tape*"); 2105module_init(idetape_init); 2106module_exit(idetape_exit); 2107MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2108MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2109MODULE_LICENSE("GPL"); 2110