ide-tape.c revision 3596b66452491a3cff26256a5e6e6061a66c4142
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 blocks) 883{ 884 idetape_tape_t *tape = drive->driver_data; 885 size_t size = blocks * tape->blk_size; 886 struct request *rq; 887 int ret; 888 889 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 890 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 891 892 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 blocks) 958{ 959 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 960 961 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks); 962} 963 964static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 965{ 966 idetape_tape_t *tape = drive->driver_data; 967 int blocks; 968 969 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 970 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 971 " but we are not writing.\n"); 972 return; 973 } 974 if (tape->buf) { 975 blocks = tape->valid / tape->blk_size; 976 if (tape->valid % tape->blk_size) { 977 blocks++; 978 memset(tape->buf + tape->valid, 0, 979 tape->blk_size - tape->valid % tape->blk_size); 980 } 981 (void) idetape_add_chrdev_write_request(drive, blocks); 982 } 983 if (tape->buf != NULL) { 984 kfree(tape->buf); 985 tape->buf = NULL; 986 } 987 tape->chrdev_dir = IDETAPE_DIR_NONE; 988} 989 990static int idetape_init_rw(ide_drive_t *drive, int dir) 991{ 992 idetape_tape_t *tape = drive->driver_data; 993 int rc; 994 995 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 996 997 if (tape->chrdev_dir == dir) 998 return 0; 999 1000 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1001 ide_tape_discard_merge_buffer(drive, 1); 1002 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1003 ide_tape_flush_merge_buffer(drive); 1004 idetape_flush_tape_buffers(drive); 1005 } 1006 1007 if (tape->buf || tape->valid) { 1008 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 1009 tape->valid = 0; 1010 } 1011 1012 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1013 if (!tape->buf) 1014 return -ENOMEM; 1015 tape->chrdev_dir = dir; 1016 tape->cur = tape->buf; 1017 1018 /* 1019 * Issue a 0 rw command to ensure that DSC handshake is 1020 * switched from completion mode to buffer available mode. No 1021 * point in issuing this if DSC overlap isn't supported, some 1022 * drives (Seagate STT3401A) will return an error. 1023 */ 1024 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1025 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 1026 : REQ_IDETAPE_WRITE; 1027 1028 rc = idetape_queue_rw_tail(drive, cmd, 0); 1029 if (rc < 0) { 1030 kfree(tape->buf); 1031 tape->buf = NULL; 1032 tape->chrdev_dir = IDETAPE_DIR_NONE; 1033 return rc; 1034 } 1035 } 1036 1037 return 0; 1038} 1039 1040/* called from idetape_chrdev_read() to service a chrdev read request. */ 1041static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) 1042{ 1043 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); 1044 1045 /* If we are at a filemark, return a read length of 0 */ 1046 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1047 return 0; 1048 1049 idetape_init_rw(drive, IDETAPE_DIR_READ); 1050 1051 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks); 1052} 1053 1054static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1055{ 1056 idetape_tape_t *tape = drive->driver_data; 1057 1058 memset(tape->buf, 0, tape->buffer_size); 1059 1060 while (bcount) { 1061 unsigned int count = min(tape->buffer_size, bcount); 1062 1063 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1064 count / tape->blk_size); 1065 bcount -= count; 1066 } 1067} 1068 1069/* 1070 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1071 * currently support only one partition. 1072 */ 1073static int idetape_rewind_tape(ide_drive_t *drive) 1074{ 1075 struct ide_tape_obj *tape = drive->driver_data; 1076 struct gendisk *disk = tape->disk; 1077 int retval; 1078 struct ide_atapi_pc pc; 1079 1080 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1081 1082 idetape_create_rewind_cmd(drive, &pc); 1083 retval = ide_queue_pc_tail(drive, disk, &pc); 1084 if (retval) 1085 return retval; 1086 1087 idetape_create_read_position_cmd(&pc); 1088 retval = ide_queue_pc_tail(drive, disk, &pc); 1089 if (retval) 1090 return retval; 1091 return 0; 1092} 1093 1094/* mtio.h compatible commands should be issued to the chrdev interface. */ 1095static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1096 unsigned long arg) 1097{ 1098 idetape_tape_t *tape = drive->driver_data; 1099 void __user *argp = (void __user *)arg; 1100 1101 struct idetape_config { 1102 int dsc_rw_frequency; 1103 int dsc_media_access_frequency; 1104 int nr_stages; 1105 } config; 1106 1107 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1108 1109 switch (cmd) { 1110 case 0x0340: 1111 if (copy_from_user(&config, argp, sizeof(config))) 1112 return -EFAULT; 1113 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1114 break; 1115 case 0x0350: 1116 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1117 config.nr_stages = 1; 1118 if (copy_to_user(argp, &config, sizeof(config))) 1119 return -EFAULT; 1120 break; 1121 default: 1122 return -EIO; 1123 } 1124 return 0; 1125} 1126 1127static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1128 int mt_count) 1129{ 1130 idetape_tape_t *tape = drive->driver_data; 1131 struct gendisk *disk = tape->disk; 1132 struct ide_atapi_pc pc; 1133 int retval, count = 0; 1134 int sprev = !!(tape->caps[4] & 0x20); 1135 1136 if (mt_count == 0) 1137 return 0; 1138 if (MTBSF == mt_op || MTBSFM == mt_op) { 1139 if (!sprev) 1140 return -EIO; 1141 mt_count = -mt_count; 1142 } 1143 1144 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1145 tape->valid = 0; 1146 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1147 ++count; 1148 ide_tape_discard_merge_buffer(drive, 0); 1149 } 1150 1151 switch (mt_op) { 1152 case MTFSF: 1153 case MTBSF: 1154 idetape_create_space_cmd(&pc, mt_count - count, 1155 IDETAPE_SPACE_OVER_FILEMARK); 1156 return ide_queue_pc_tail(drive, disk, &pc); 1157 case MTFSFM: 1158 case MTBSFM: 1159 if (!sprev) 1160 return -EIO; 1161 retval = idetape_space_over_filemarks(drive, MTFSF, 1162 mt_count - count); 1163 if (retval) 1164 return retval; 1165 count = (MTBSFM == mt_op ? 1 : -1); 1166 return idetape_space_over_filemarks(drive, MTFSF, count); 1167 default: 1168 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1169 mt_op); 1170 return -EIO; 1171 } 1172} 1173 1174/* 1175 * Our character device read / write functions. 1176 * 1177 * The tape is optimized to maximize throughput when it is transferring an 1178 * integral number of the "continuous transfer limit", which is a parameter of 1179 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1180 * 1181 * As of version 1.3 of the driver, the character device provides an abstract 1182 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1183 * same backup/restore procedure is supported. The driver will internally 1184 * convert the requests to the recommended transfer unit, so that an unmatch 1185 * between the user's block size to the recommended size will only result in a 1186 * (slightly) increased driver overhead, but will no longer hit performance. 1187 * This is not applicable to Onstream. 1188 */ 1189static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1190 size_t count, loff_t *ppos) 1191{ 1192 struct ide_tape_obj *tape = file->private_data; 1193 ide_drive_t *drive = tape->drive; 1194 ssize_t bytes_read, temp, actually_read = 0, rc; 1195 ssize_t ret = 0; 1196 u16 ctl = *(u16 *)&tape->caps[12]; 1197 1198 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1199 1200 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1201 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1202 if (count > tape->blk_size && 1203 (count % tape->blk_size) == 0) 1204 tape->user_bs_factor = count / tape->blk_size; 1205 } 1206 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1207 if (rc < 0) 1208 return rc; 1209 if (count == 0) 1210 return (0); 1211 if (tape->valid) { 1212 actually_read = min_t(unsigned int, tape->valid, count); 1213 if (copy_to_user(buf, tape->cur, actually_read)) 1214 ret = -EFAULT; 1215 buf += actually_read; 1216 count -= actually_read; 1217 tape->cur += actually_read; 1218 tape->valid -= actually_read; 1219 } 1220 while (count >= tape->buffer_size) { 1221 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1222 if (bytes_read <= 0) 1223 goto finish; 1224 if (copy_to_user(buf, tape->cur, bytes_read)) 1225 ret = -EFAULT; 1226 buf += bytes_read; 1227 count -= bytes_read; 1228 actually_read += bytes_read; 1229 } 1230 if (count) { 1231 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1232 if (bytes_read <= 0) 1233 goto finish; 1234 temp = min((unsigned long)count, (unsigned long)bytes_read); 1235 if (copy_to_user(buf, tape->cur, temp)) 1236 ret = -EFAULT; 1237 actually_read += temp; 1238 tape->cur += temp; 1239 tape->valid -= temp; 1240 } 1241finish: 1242 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1243 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1244 1245 idetape_space_over_filemarks(drive, MTFSF, 1); 1246 return 0; 1247 } 1248 1249 return ret ? ret : actually_read; 1250} 1251 1252static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1253 size_t count, loff_t *ppos) 1254{ 1255 struct ide_tape_obj *tape = file->private_data; 1256 ide_drive_t *drive = tape->drive; 1257 ssize_t actually_written = 0; 1258 ssize_t ret = 0; 1259 u16 ctl = *(u16 *)&tape->caps[12]; 1260 int rc; 1261 1262 /* The drive is write protected. */ 1263 if (tape->write_prot) 1264 return -EACCES; 1265 1266 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1267 1268 /* Initialize write operation */ 1269 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1270 if (rc < 0) 1271 return rc; 1272 if (count == 0) 1273 return (0); 1274 if (tape->valid < tape->buffer_size) { 1275 actually_written = min_t(unsigned int, 1276 tape->buffer_size - tape->valid, 1277 count); 1278 if (copy_from_user(tape->cur, buf, actually_written)) 1279 ret = -EFAULT; 1280 buf += actually_written; 1281 count -= actually_written; 1282 tape->cur += actually_written; 1283 tape->valid += actually_written; 1284 1285 if (tape->valid == tape->buffer_size) { 1286 ssize_t retval; 1287 retval = idetape_add_chrdev_write_request(drive, ctl); 1288 if (retval <= 0) 1289 return (retval); 1290 } 1291 } 1292 while (count >= tape->buffer_size) { 1293 ssize_t retval; 1294 if (copy_from_user(tape->cur, buf, tape->buffer_size)) 1295 ret = -EFAULT; 1296 buf += tape->buffer_size; 1297 count -= tape->buffer_size; 1298 retval = idetape_add_chrdev_write_request(drive, ctl); 1299 actually_written += tape->buffer_size; 1300 if (retval <= 0) 1301 return (retval); 1302 } 1303 if (count) { 1304 actually_written += count; 1305 if (copy_from_user(tape->cur, buf, count)) 1306 ret = -EFAULT; 1307 tape->cur += count; 1308 tape->valid += count; 1309 } 1310 return ret ? ret : actually_written; 1311} 1312 1313static int idetape_write_filemark(ide_drive_t *drive) 1314{ 1315 struct ide_tape_obj *tape = drive->driver_data; 1316 struct ide_atapi_pc pc; 1317 1318 /* Write a filemark */ 1319 idetape_create_write_filemark_cmd(drive, &pc, 1); 1320 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1321 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1322 return -EIO; 1323 } 1324 return 0; 1325} 1326 1327/* 1328 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1329 * requested. 1330 * 1331 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1332 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1333 * usually not supported. 1334 * 1335 * The following commands are currently not supported: 1336 * 1337 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1338 * MT_ST_WRITE_THRESHOLD. 1339 */ 1340static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1341{ 1342 idetape_tape_t *tape = drive->driver_data; 1343 struct gendisk *disk = tape->disk; 1344 struct ide_atapi_pc pc; 1345 int i, retval; 1346 1347 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1348 mt_op, mt_count); 1349 1350 switch (mt_op) { 1351 case MTFSF: 1352 case MTFSFM: 1353 case MTBSF: 1354 case MTBSFM: 1355 if (!mt_count) 1356 return 0; 1357 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1358 default: 1359 break; 1360 } 1361 1362 switch (mt_op) { 1363 case MTWEOF: 1364 if (tape->write_prot) 1365 return -EACCES; 1366 ide_tape_discard_merge_buffer(drive, 1); 1367 for (i = 0; i < mt_count; i++) { 1368 retval = idetape_write_filemark(drive); 1369 if (retval) 1370 return retval; 1371 } 1372 return 0; 1373 case MTREW: 1374 ide_tape_discard_merge_buffer(drive, 0); 1375 if (idetape_rewind_tape(drive)) 1376 return -EIO; 1377 return 0; 1378 case MTLOAD: 1379 ide_tape_discard_merge_buffer(drive, 0); 1380 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1381 case MTUNLOAD: 1382 case MTOFFL: 1383 /* 1384 * If door is locked, attempt to unlock before 1385 * attempting to eject. 1386 */ 1387 if (tape->door_locked) { 1388 if (!ide_set_media_lock(drive, disk, 0)) 1389 tape->door_locked = DOOR_UNLOCKED; 1390 } 1391 ide_tape_discard_merge_buffer(drive, 0); 1392 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1393 if (!retval) 1394 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1395 return retval; 1396 case MTNOP: 1397 ide_tape_discard_merge_buffer(drive, 0); 1398 return idetape_flush_tape_buffers(drive); 1399 case MTRETEN: 1400 ide_tape_discard_merge_buffer(drive, 0); 1401 return ide_do_start_stop(drive, disk, 1402 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1403 case MTEOM: 1404 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1405 return ide_queue_pc_tail(drive, disk, &pc); 1406 case MTERASE: 1407 (void)idetape_rewind_tape(drive); 1408 idetape_create_erase_cmd(&pc); 1409 return ide_queue_pc_tail(drive, disk, &pc); 1410 case MTSETBLK: 1411 if (mt_count) { 1412 if (mt_count < tape->blk_size || 1413 mt_count % tape->blk_size) 1414 return -EIO; 1415 tape->user_bs_factor = mt_count / tape->blk_size; 1416 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1417 } else 1418 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1419 return 0; 1420 case MTSEEK: 1421 ide_tape_discard_merge_buffer(drive, 0); 1422 return idetape_position_tape(drive, 1423 mt_count * tape->user_bs_factor, tape->partition, 0); 1424 case MTSETPART: 1425 ide_tape_discard_merge_buffer(drive, 0); 1426 return idetape_position_tape(drive, 0, mt_count, 0); 1427 case MTFSR: 1428 case MTBSR: 1429 case MTLOCK: 1430 retval = ide_set_media_lock(drive, disk, 1); 1431 if (retval) 1432 return retval; 1433 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1434 return 0; 1435 case MTUNLOCK: 1436 retval = ide_set_media_lock(drive, disk, 0); 1437 if (retval) 1438 return retval; 1439 tape->door_locked = DOOR_UNLOCKED; 1440 return 0; 1441 default: 1442 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1443 mt_op); 1444 return -EIO; 1445 } 1446} 1447 1448/* 1449 * Our character device ioctls. General mtio.h magnetic io commands are 1450 * supported here, and not in the corresponding block interface. Our own 1451 * ide-tape ioctls are supported on both interfaces. 1452 */ 1453static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1454 unsigned int cmd, unsigned long arg) 1455{ 1456 struct ide_tape_obj *tape = file->private_data; 1457 ide_drive_t *drive = tape->drive; 1458 struct mtop mtop; 1459 struct mtget mtget; 1460 struct mtpos mtpos; 1461 int block_offset = 0, position = tape->first_frame; 1462 void __user *argp = (void __user *)arg; 1463 1464 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1465 1466 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1467 ide_tape_flush_merge_buffer(drive); 1468 idetape_flush_tape_buffers(drive); 1469 } 1470 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1471 block_offset = tape->valid / 1472 (tape->blk_size * tape->user_bs_factor); 1473 position = idetape_read_position(drive); 1474 if (position < 0) 1475 return -EIO; 1476 } 1477 switch (cmd) { 1478 case MTIOCTOP: 1479 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1480 return -EFAULT; 1481 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1482 case MTIOCGET: 1483 memset(&mtget, 0, sizeof(struct mtget)); 1484 mtget.mt_type = MT_ISSCSI2; 1485 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1486 mtget.mt_dsreg = 1487 ((tape->blk_size * tape->user_bs_factor) 1488 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1489 1490 if (tape->drv_write_prot) 1491 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1492 1493 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1494 return -EFAULT; 1495 return 0; 1496 case MTIOCPOS: 1497 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1498 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1499 return -EFAULT; 1500 return 0; 1501 default: 1502 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1503 ide_tape_discard_merge_buffer(drive, 1); 1504 return idetape_blkdev_ioctl(drive, cmd, arg); 1505 } 1506} 1507 1508/* 1509 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1510 * block size with the reported value. 1511 */ 1512static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1513{ 1514 idetape_tape_t *tape = drive->driver_data; 1515 struct ide_atapi_pc pc; 1516 1517 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1518 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1519 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1520 if (tape->blk_size == 0) { 1521 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1522 "block size, assuming 32k\n"); 1523 tape->blk_size = 32768; 1524 } 1525 return; 1526 } 1527 tape->blk_size = (pc.buf[4 + 5] << 16) + 1528 (pc.buf[4 + 6] << 8) + 1529 pc.buf[4 + 7]; 1530 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 1531} 1532 1533static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1534{ 1535 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1536 ide_drive_t *drive; 1537 idetape_tape_t *tape; 1538 int retval; 1539 1540 if (i >= MAX_HWIFS * MAX_DRIVES) 1541 return -ENXIO; 1542 1543 lock_kernel(); 1544 tape = ide_tape_chrdev_get(i); 1545 if (!tape) { 1546 unlock_kernel(); 1547 return -ENXIO; 1548 } 1549 1550 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1551 1552 /* 1553 * We really want to do nonseekable_open(inode, filp); here, but some 1554 * versions of tar incorrectly call lseek on tapes and bail out if that 1555 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1556 */ 1557 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1558 1559 drive = tape->drive; 1560 1561 filp->private_data = tape; 1562 1563 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1564 retval = -EBUSY; 1565 goto out_put_tape; 1566 } 1567 1568 retval = idetape_wait_ready(drive, 60 * HZ); 1569 if (retval) { 1570 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1571 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1572 goto out_put_tape; 1573 } 1574 1575 idetape_read_position(drive); 1576 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1577 (void)idetape_rewind_tape(drive); 1578 1579 /* Read block size and write protect status from drive. */ 1580 ide_tape_get_bsize_from_bdesc(drive); 1581 1582 /* Set write protect flag if device is opened as read-only. */ 1583 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1584 tape->write_prot = 1; 1585 else 1586 tape->write_prot = tape->drv_write_prot; 1587 1588 /* Make sure drive isn't write protected if user wants to write. */ 1589 if (tape->write_prot) { 1590 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1591 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1592 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1593 retval = -EROFS; 1594 goto out_put_tape; 1595 } 1596 } 1597 1598 /* Lock the tape drive door so user can't eject. */ 1599 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1600 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1601 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1602 tape->door_locked = DOOR_LOCKED; 1603 } 1604 } 1605 unlock_kernel(); 1606 return 0; 1607 1608out_put_tape: 1609 ide_tape_put(tape); 1610 unlock_kernel(); 1611 return retval; 1612} 1613 1614static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1615{ 1616 idetape_tape_t *tape = drive->driver_data; 1617 1618 ide_tape_flush_merge_buffer(drive); 1619 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1620 if (tape->buf != NULL) { 1621 idetape_pad_zeros(drive, tape->blk_size * 1622 (tape->user_bs_factor - 1)); 1623 kfree(tape->buf); 1624 tape->buf = NULL; 1625 } 1626 idetape_write_filemark(drive); 1627 idetape_flush_tape_buffers(drive); 1628 idetape_flush_tape_buffers(drive); 1629} 1630 1631static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1632{ 1633 struct ide_tape_obj *tape = filp->private_data; 1634 ide_drive_t *drive = tape->drive; 1635 unsigned int minor = iminor(inode); 1636 1637 lock_kernel(); 1638 tape = drive->driver_data; 1639 1640 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1641 1642 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1643 idetape_write_release(drive, minor); 1644 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1645 if (minor < 128) 1646 ide_tape_discard_merge_buffer(drive, 1); 1647 } 1648 1649 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1650 (void) idetape_rewind_tape(drive); 1651 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1652 if (tape->door_locked == DOOR_LOCKED) { 1653 if (!ide_set_media_lock(drive, tape->disk, 0)) 1654 tape->door_locked = DOOR_UNLOCKED; 1655 } 1656 } 1657 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1658 ide_tape_put(tape); 1659 unlock_kernel(); 1660 return 0; 1661} 1662 1663static void idetape_get_inquiry_results(ide_drive_t *drive) 1664{ 1665 idetape_tape_t *tape = drive->driver_data; 1666 struct ide_atapi_pc pc; 1667 u8 pc_buf[256]; 1668 char fw_rev[4], vendor_id[8], product_id[16]; 1669 1670 idetape_create_inquiry_cmd(&pc); 1671 pc.buf = &pc_buf[0]; 1672 pc.buf_size = sizeof(pc_buf); 1673 1674 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1675 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1676 tape->name); 1677 return; 1678 } 1679 memcpy(vendor_id, &pc.buf[8], 8); 1680 memcpy(product_id, &pc.buf[16], 16); 1681 memcpy(fw_rev, &pc.buf[32], 4); 1682 1683 ide_fixstring(vendor_id, 8, 0); 1684 ide_fixstring(product_id, 16, 0); 1685 ide_fixstring(fw_rev, 4, 0); 1686 1687 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1688 drive->name, tape->name, vendor_id, product_id, fw_rev); 1689} 1690 1691/* 1692 * Ask the tape about its various parameters. In particular, we will adjust our 1693 * data transfer buffer size to the recommended value as returned by the tape. 1694 */ 1695static void idetape_get_mode_sense_results(ide_drive_t *drive) 1696{ 1697 idetape_tape_t *tape = drive->driver_data; 1698 struct ide_atapi_pc pc; 1699 u8 *caps; 1700 u8 speed, max_speed; 1701 1702 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1703 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1704 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1705 " some default values\n"); 1706 tape->blk_size = 512; 1707 put_unaligned(52, (u16 *)&tape->caps[12]); 1708 put_unaligned(540, (u16 *)&tape->caps[14]); 1709 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1710 return; 1711 } 1712 caps = pc.buf + 4 + pc.buf[3]; 1713 1714 /* convert to host order and save for later use */ 1715 speed = be16_to_cpup((__be16 *)&caps[14]); 1716 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1717 1718 *(u16 *)&caps[8] = max_speed; 1719 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1720 *(u16 *)&caps[14] = speed; 1721 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1722 1723 if (!speed) { 1724 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1725 "(assuming 650KB/sec)\n", drive->name); 1726 *(u16 *)&caps[14] = 650; 1727 } 1728 if (!max_speed) { 1729 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1730 "(assuming 650KB/sec)\n", drive->name); 1731 *(u16 *)&caps[8] = 650; 1732 } 1733 1734 memcpy(&tape->caps, caps, 20); 1735 1736 /* device lacks locking support according to capabilities page */ 1737 if ((caps[6] & 1) == 0) 1738 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1739 1740 if (caps[7] & 0x02) 1741 tape->blk_size = 512; 1742 else if (caps[7] & 0x04) 1743 tape->blk_size = 1024; 1744} 1745 1746#ifdef CONFIG_IDE_PROC_FS 1747#define ide_tape_devset_get(name, field) \ 1748static int get_##name(ide_drive_t *drive) \ 1749{ \ 1750 idetape_tape_t *tape = drive->driver_data; \ 1751 return tape->field; \ 1752} 1753 1754#define ide_tape_devset_set(name, field) \ 1755static int set_##name(ide_drive_t *drive, int arg) \ 1756{ \ 1757 idetape_tape_t *tape = drive->driver_data; \ 1758 tape->field = arg; \ 1759 return 0; \ 1760} 1761 1762#define ide_tape_devset_rw_field(_name, _field) \ 1763ide_tape_devset_get(_name, _field) \ 1764ide_tape_devset_set(_name, _field) \ 1765IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1766 1767#define ide_tape_devset_r_field(_name, _field) \ 1768ide_tape_devset_get(_name, _field) \ 1769IDE_DEVSET(_name, 0, get_##_name, NULL) 1770 1771static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1772static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1773static int divf_buffer(ide_drive_t *drive) { return 2; } 1774static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1775 1776ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1777 1778ide_tape_devset_rw_field(debug_mask, debug_mask); 1779ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1780 1781ide_tape_devset_r_field(avg_speed, avg_speed); 1782ide_tape_devset_r_field(speed, caps[14]); 1783ide_tape_devset_r_field(buffer, caps[16]); 1784ide_tape_devset_r_field(buffer_size, buffer_size); 1785 1786static const struct ide_proc_devset idetape_settings[] = { 1787 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1788 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1789 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1790 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1791 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1792 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1793 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1794 mulf_tdsc, divf_tdsc), 1795 { NULL }, 1796}; 1797#endif 1798 1799/* 1800 * The function below is called to: 1801 * 1802 * 1. Initialize our various state variables. 1803 * 2. Ask the tape for its capabilities. 1804 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1805 * is chosen based on the recommendation which we received in step 2. 1806 * 1807 * Note that at this point ide.c already assigned us an irq, so that we can 1808 * queue requests here and wait for their completion. 1809 */ 1810static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1811{ 1812 unsigned long t; 1813 int speed; 1814 int buffer_size; 1815 u16 *ctl = (u16 *)&tape->caps[12]; 1816 1817 drive->pc_callback = ide_tape_callback; 1818 1819 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1820 1821 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1822 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1823 tape->name); 1824 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1825 } 1826 1827 /* Seagate Travan drives do not support DSC overlap. */ 1828 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1829 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1830 1831 tape->minor = minor; 1832 tape->name[0] = 'h'; 1833 tape->name[1] = 't'; 1834 tape->name[2] = '0' + minor; 1835 tape->chrdev_dir = IDETAPE_DIR_NONE; 1836 1837 idetape_get_inquiry_results(drive); 1838 idetape_get_mode_sense_results(drive); 1839 ide_tape_get_bsize_from_bdesc(drive); 1840 tape->user_bs_factor = 1; 1841 tape->buffer_size = *ctl * tape->blk_size; 1842 while (tape->buffer_size > 0xffff) { 1843 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1844 *ctl /= 2; 1845 tape->buffer_size = *ctl * tape->blk_size; 1846 } 1847 buffer_size = tape->buffer_size; 1848 1849 /* select the "best" DSC read/write polling freq */ 1850 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1851 1852 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1853 1854 /* 1855 * Ensure that the number we got makes sense; limit it within 1856 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1857 */ 1858 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1859 IDETAPE_DSC_RW_MAX); 1860 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1861 "%lums tDSC%s\n", 1862 drive->name, tape->name, *(u16 *)&tape->caps[14], 1863 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1864 tape->buffer_size / 1024, 1865 tape->best_dsc_rw_freq * 1000 / HZ, 1866 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1867 1868 ide_proc_register_driver(drive, tape->driver); 1869} 1870 1871static void ide_tape_remove(ide_drive_t *drive) 1872{ 1873 idetape_tape_t *tape = drive->driver_data; 1874 1875 ide_proc_unregister_driver(drive, tape->driver); 1876 device_del(&tape->dev); 1877 ide_unregister_region(tape->disk); 1878 1879 mutex_lock(&idetape_ref_mutex); 1880 put_device(&tape->dev); 1881 mutex_unlock(&idetape_ref_mutex); 1882} 1883 1884static void ide_tape_release(struct device *dev) 1885{ 1886 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1887 ide_drive_t *drive = tape->drive; 1888 struct gendisk *g = tape->disk; 1889 1890 BUG_ON(tape->valid); 1891 1892 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1893 drive->driver_data = NULL; 1894 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1895 device_destroy(idetape_sysfs_class, 1896 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1897 idetape_devs[tape->minor] = NULL; 1898 g->private_data = NULL; 1899 put_disk(g); 1900 kfree(tape); 1901} 1902 1903#ifdef CONFIG_IDE_PROC_FS 1904static int proc_idetape_read_name 1905 (char *page, char **start, off_t off, int count, int *eof, void *data) 1906{ 1907 ide_drive_t *drive = (ide_drive_t *) data; 1908 idetape_tape_t *tape = drive->driver_data; 1909 char *out = page; 1910 int len; 1911 1912 len = sprintf(out, "%s\n", tape->name); 1913 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1914} 1915 1916static ide_proc_entry_t idetape_proc[] = { 1917 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1918 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1919 { NULL, 0, NULL, NULL } 1920}; 1921 1922static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1923{ 1924 return idetape_proc; 1925} 1926 1927static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1928{ 1929 return idetape_settings; 1930} 1931#endif 1932 1933static int ide_tape_probe(ide_drive_t *); 1934 1935static struct ide_driver idetape_driver = { 1936 .gen_driver = { 1937 .owner = THIS_MODULE, 1938 .name = "ide-tape", 1939 .bus = &ide_bus_type, 1940 }, 1941 .probe = ide_tape_probe, 1942 .remove = ide_tape_remove, 1943 .version = IDETAPE_VERSION, 1944 .do_request = idetape_do_request, 1945#ifdef CONFIG_IDE_PROC_FS 1946 .proc_entries = ide_tape_proc_entries, 1947 .proc_devsets = ide_tape_proc_devsets, 1948#endif 1949}; 1950 1951/* Our character device supporting functions, passed to register_chrdev. */ 1952static const struct file_operations idetape_fops = { 1953 .owner = THIS_MODULE, 1954 .read = idetape_chrdev_read, 1955 .write = idetape_chrdev_write, 1956 .ioctl = idetape_chrdev_ioctl, 1957 .open = idetape_chrdev_open, 1958 .release = idetape_chrdev_release, 1959}; 1960 1961static int idetape_open(struct block_device *bdev, fmode_t mode) 1962{ 1963 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1964 1965 if (!tape) 1966 return -ENXIO; 1967 1968 return 0; 1969} 1970 1971static int idetape_release(struct gendisk *disk, fmode_t mode) 1972{ 1973 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1974 1975 ide_tape_put(tape); 1976 return 0; 1977} 1978 1979static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1980 unsigned int cmd, unsigned long arg) 1981{ 1982 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1983 ide_drive_t *drive = tape->drive; 1984 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 1985 if (err == -EINVAL) 1986 err = idetape_blkdev_ioctl(drive, cmd, arg); 1987 return err; 1988} 1989 1990static struct block_device_operations idetape_block_ops = { 1991 .owner = THIS_MODULE, 1992 .open = idetape_open, 1993 .release = idetape_release, 1994 .locked_ioctl = idetape_ioctl, 1995}; 1996 1997static int ide_tape_probe(ide_drive_t *drive) 1998{ 1999 idetape_tape_t *tape; 2000 struct gendisk *g; 2001 int minor; 2002 2003 if (!strstr("ide-tape", drive->driver_req)) 2004 goto failed; 2005 2006 if (drive->media != ide_tape) 2007 goto failed; 2008 2009 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 2010 ide_check_atapi_device(drive, DRV_NAME) == 0) { 2011 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 2012 " the driver\n", drive->name); 2013 goto failed; 2014 } 2015 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 2016 if (tape == NULL) { 2017 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 2018 drive->name); 2019 goto failed; 2020 } 2021 2022 g = alloc_disk(1 << PARTN_BITS); 2023 if (!g) 2024 goto out_free_tape; 2025 2026 ide_init_disk(g, drive); 2027 2028 tape->dev.parent = &drive->gendev; 2029 tape->dev.release = ide_tape_release; 2030 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 2031 2032 if (device_register(&tape->dev)) 2033 goto out_free_disk; 2034 2035 tape->drive = drive; 2036 tape->driver = &idetape_driver; 2037 tape->disk = g; 2038 2039 g->private_data = &tape->driver; 2040 2041 drive->driver_data = tape; 2042 2043 mutex_lock(&idetape_ref_mutex); 2044 for (minor = 0; idetape_devs[minor]; minor++) 2045 ; 2046 idetape_devs[minor] = tape; 2047 mutex_unlock(&idetape_ref_mutex); 2048 2049 idetape_setup(drive, tape, minor); 2050 2051 device_create(idetape_sysfs_class, &drive->gendev, 2052 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 2053 device_create(idetape_sysfs_class, &drive->gendev, 2054 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2055 "n%s", tape->name); 2056 2057 g->fops = &idetape_block_ops; 2058 ide_register_region(g); 2059 2060 return 0; 2061 2062out_free_disk: 2063 put_disk(g); 2064out_free_tape: 2065 kfree(tape); 2066failed: 2067 return -ENODEV; 2068} 2069 2070static void __exit idetape_exit(void) 2071{ 2072 driver_unregister(&idetape_driver.gen_driver); 2073 class_destroy(idetape_sysfs_class); 2074 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2075} 2076 2077static int __init idetape_init(void) 2078{ 2079 int error = 1; 2080 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2081 if (IS_ERR(idetape_sysfs_class)) { 2082 idetape_sysfs_class = NULL; 2083 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2084 error = -EBUSY; 2085 goto out; 2086 } 2087 2088 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2089 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2090 " interface\n"); 2091 error = -EBUSY; 2092 goto out_free_class; 2093 } 2094 2095 error = driver_register(&idetape_driver.gen_driver); 2096 if (error) 2097 goto out_free_driver; 2098 2099 return 0; 2100 2101out_free_driver: 2102 driver_unregister(&idetape_driver.gen_driver); 2103out_free_class: 2104 class_destroy(idetape_sysfs_class); 2105out: 2106 return error; 2107} 2108 2109MODULE_ALIAS("ide:*m-tape*"); 2110module_init(idetape_init); 2111module_exit(idetape_exit); 2112MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2113MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2114MODULE_LICENSE("GPL"); 2115