1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying 4 file Documentation/scsi/st.rst for more information. 5 6 History: 7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. 8 Contribution and ideas from several people including (in alphabetical 9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, 10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, 11 Michael Schaefer, J"org Weule, and Eric Youngdale. 12 13 Copyright 1992 - 2016 Kai Makisara 14 email Kai.Makisara@kolumbus.fi 15 16 Some small formal changes - aeb, 950809 17 18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 19 */ 20 21static const char *verstr = "20160209"; 22 23#include <linux/module.h> 24 25#include <linux/compat.h> 26#include <linux/fs.h> 27#include <linux/kernel.h> 28#include <linux/sched/signal.h> 29#include <linux/mm.h> 30#include <linux/init.h> 31#include <linux/string.h> 32#include <linux/slab.h> 33#include <linux/errno.h> 34#include <linux/mtio.h> 35#include <linux/major.h> 36#include <linux/cdrom.h> 37#include <linux/ioctl.h> 38#include <linux/fcntl.h> 39#include <linux/spinlock.h> 40#include <linux/blkdev.h> 41#include <linux/moduleparam.h> 42#include <linux/cdev.h> 43#include <linux/idr.h> 44#include <linux/delay.h> 45#include <linux/mutex.h> 46 47#include <linux/uaccess.h> 48#include <asm/dma.h> 49#include <asm/unaligned.h> 50 51#include <scsi/scsi.h> 52#include <scsi/scsi_dbg.h> 53#include <scsi/scsi_device.h> 54#include <scsi/scsi_driver.h> 55#include <scsi/scsi_eh.h> 56#include <scsi/scsi_host.h> 57#include <scsi/scsi_ioctl.h> 58#include <scsi/sg.h> 59 60 61/* The driver prints some debugging information on the console if DEBUG 62 is defined and non-zero. */ 63#define DEBUG 1 64#define NO_DEBUG 0 65 66#define ST_DEB_MSG KERN_NOTICE 67#if DEBUG 68/* The message level for the debug messages is currently set to KERN_NOTICE 69 so that people can easily see the messages. Later when the debugging messages 70 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 71#define DEB(a) a 72#define DEBC(a) if (debugging) { a ; } 73#else 74#define DEB(a) 75#define DEBC(a) 76#endif 77 78#define ST_KILOBYTE 1024 79 80#include "st_options.h" 81#include "st.h" 82 83static int buffer_kbs; 84static int max_sg_segs; 85static int try_direct_io = TRY_DIRECT_IO; 86static int try_rdio = 1; 87static int try_wdio = 1; 88static int debug_flag; 89 90static const struct class st_sysfs_class; 91static const struct attribute_group *st_dev_groups[]; 92static const struct attribute_group *st_drv_groups[]; 93 94MODULE_AUTHOR("Kai Makisara"); 95MODULE_DESCRIPTION("SCSI tape (st) driver"); 96MODULE_LICENSE("GPL"); 97MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 98MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 99 100/* Set 'perm' (4th argument) to 0 to disable module_param's definition 101 * of sysfs parameters (which module_param doesn't yet support). 102 * Sysfs parameters defined explicitly later. 103 */ 104module_param_named(buffer_kbs, buffer_kbs, int, 0); 105MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 106module_param_named(max_sg_segs, max_sg_segs, int, 0); 107MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 108module_param_named(try_direct_io, try_direct_io, int, 0); 109MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 110module_param_named(debug_flag, debug_flag, int, 0); 111MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 112 113 114/* Extra parameters for testing */ 115module_param_named(try_rdio, try_rdio, int, 0); 116MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 117module_param_named(try_wdio, try_wdio, int, 0); 118MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 119 120#ifndef MODULE 121static int write_threshold_kbs; /* retained for compatibility */ 122static struct st_dev_parm { 123 char *name; 124 int *val; 125} parms[] __initdata = { 126 { 127 "buffer_kbs", &buffer_kbs 128 }, 129 { /* Retained for compatibility with 2.4 */ 130 "write_threshold_kbs", &write_threshold_kbs 131 }, 132 { 133 "max_sg_segs", NULL 134 }, 135 { 136 "try_direct_io", &try_direct_io 137 }, 138 { 139 "debug_flag", &debug_flag 140 } 141}; 142#endif 143 144/* Restrict the number of modes so that names for all are assigned */ 145#if ST_NBR_MODES > 16 146#error "Maximum number of modes is 16" 147#endif 148/* Bit reversed order to get same names for same minors with all 149 mode counts */ 150static const char *st_formats[] = { 151 "", "r", "k", "s", "l", "t", "o", "u", 152 "m", "v", "p", "x", "a", "y", "q", "z"}; 153 154/* The default definitions have been moved to st_options.h */ 155 156#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 157 158/* The buffer size should fit into the 24 bits for length in the 159 6-byte SCSI read and write commands. */ 160#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 161#error "Buffer size should not exceed (2 << 24 - 1) bytes!" 162#endif 163 164static int debugging = DEBUG; 165 166#define MAX_RETRIES 0 167#define MAX_WRITE_RETRIES 0 168#define MAX_READY_RETRIES 0 169#define NO_TAPE NOT_READY 170 171#define ST_TIMEOUT (900 * HZ) 172#define ST_LONG_TIMEOUT (14000 * HZ) 173 174/* Remove mode bits and auto-rewind bit (7) */ 175#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 176 (iminor(x) & ((1 << ST_MODE_SHIFT)-1))) 177#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 178 179/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 180#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 181 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 182 183/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 184 24 bits) */ 185#define SET_DENS_AND_BLK 0x10001 186 187static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 188static int st_max_sg_segs = ST_MAX_SG; 189 190static int modes_defined; 191 192static int enlarge_buffer(struct st_buffer *, int); 193static void clear_buffer(struct st_buffer *); 194static void normalize_buffer(struct st_buffer *); 195static int append_to_buffer(const char __user *, struct st_buffer *, int); 196static int from_buffer(struct st_buffer *, char __user *, int); 197static void move_buffer_data(struct st_buffer *, int); 198 199static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 200 unsigned long, size_t, int); 201static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 202 203static int st_probe(struct device *); 204static int st_remove(struct device *); 205 206static struct scsi_driver st_template = { 207 .gendrv = { 208 .name = "st", 209 .owner = THIS_MODULE, 210 .probe = st_probe, 211 .remove = st_remove, 212 .groups = st_drv_groups, 213 }, 214}; 215 216static int st_compression(struct scsi_tape *, int); 217 218static int find_partition(struct scsi_tape *); 219static int switch_partition(struct scsi_tape *); 220 221static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 222 223static void scsi_tape_release(struct kref *); 224 225#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 226 227static DEFINE_MUTEX(st_ref_mutex); 228static DEFINE_SPINLOCK(st_index_lock); 229static DEFINE_SPINLOCK(st_use_lock); 230static DEFINE_IDR(st_index_idr); 231 232 233 234#ifndef SIGS_FROM_OSST 235#define SIGS_FROM_OSST \ 236 {"OnStream", "SC-", "", "osst"}, \ 237 {"OnStream", "DI-", "", "osst"}, \ 238 {"OnStream", "DP-", "", "osst"}, \ 239 {"OnStream", "USB", "", "osst"}, \ 240 {"OnStream", "FW-", "", "osst"} 241#endif 242 243static struct scsi_tape *scsi_tape_get(int dev) 244{ 245 struct scsi_tape *STp = NULL; 246 247 mutex_lock(&st_ref_mutex); 248 spin_lock(&st_index_lock); 249 250 STp = idr_find(&st_index_idr, dev); 251 if (!STp) goto out; 252 253 kref_get(&STp->kref); 254 255 if (!STp->device) 256 goto out_put; 257 258 if (scsi_device_get(STp->device)) 259 goto out_put; 260 261 goto out; 262 263out_put: 264 kref_put(&STp->kref, scsi_tape_release); 265 STp = NULL; 266out: 267 spin_unlock(&st_index_lock); 268 mutex_unlock(&st_ref_mutex); 269 return STp; 270} 271 272static void scsi_tape_put(struct scsi_tape *STp) 273{ 274 struct scsi_device *sdev = STp->device; 275 276 mutex_lock(&st_ref_mutex); 277 kref_put(&STp->kref, scsi_tape_release); 278 scsi_device_put(sdev); 279 mutex_unlock(&st_ref_mutex); 280} 281 282struct st_reject_data { 283 char *vendor; 284 char *model; 285 char *rev; 286 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 287}; 288 289static struct st_reject_data reject_list[] = { 290 /* {"XXX", "Yy-", "", NULL}, example */ 291 SIGS_FROM_OSST, 292 {NULL, }}; 293 294/* If the device signature is on the list of incompatible drives, the 295 function returns a pointer to the name of the correct driver (if known) */ 296static char * st_incompatible(struct scsi_device* SDp) 297{ 298 struct st_reject_data *rp; 299 300 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 301 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 302 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 303 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 304 if (rp->driver_hint) 305 return rp->driver_hint; 306 else 307 return "unknown"; 308 } 309 return NULL; 310} 311 312 313#define st_printk(prefix, t, fmt, a...) \ 314 sdev_prefix_printk(prefix, (t)->device, (t)->name, fmt, ##a) 315#ifdef DEBUG 316#define DEBC_printk(t, fmt, a...) \ 317 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 318#else 319#define DEBC_printk(t, fmt, a...) 320#endif 321 322static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 323{ 324 const u8 *ucp; 325 const u8 *sense = SRpnt->sense; 326 327 s->have_sense = scsi_normalize_sense(SRpnt->sense, 328 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 329 s->flags = 0; 330 331 if (s->have_sense) { 332 s->deferred = 0; 333 s->remainder_valid = 334 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 335 switch (sense[0] & 0x7f) { 336 case 0x71: 337 s->deferred = 1; 338 fallthrough; 339 case 0x70: 340 s->fixed_format = 1; 341 s->flags = sense[2] & 0xe0; 342 break; 343 case 0x73: 344 s->deferred = 1; 345 fallthrough; 346 case 0x72: 347 s->fixed_format = 0; 348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 349 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 350 break; 351 } 352 } 353} 354 355 356/* Convert the result to success code */ 357static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 358{ 359 int result = SRpnt->result; 360 u8 scode; 361 DEB(const char *stp;) 362 char *name = STp->name; 363 struct st_cmdstatus *cmdstatp; 364 365 if (!result) 366 return 0; 367 368 cmdstatp = &STp->buffer->cmdstat; 369 st_analyze_sense(SRpnt, cmdstatp); 370 371 if (cmdstatp->have_sense) 372 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 373 else 374 scode = 0; 375 376 DEB( 377 if (debugging) { 378 st_printk(ST_DEB_MSG, STp, 379 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 382 if (cmdstatp->have_sense) 383 __scsi_print_sense(STp->device, name, 384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 385 } ) /* end DEB */ 386 if (!debugging) { /* Abnormal conditions for tape */ 387 if (!cmdstatp->have_sense) 388 st_printk(KERN_WARNING, STp, 389 "Error %x (driver bt 0, host bt 0x%x).\n", 390 result, host_byte(result)); 391 else if (cmdstatp->have_sense && 392 scode != NO_SENSE && 393 scode != RECOVERED_ERROR && 394 /* scode != UNIT_ATTENTION && */ 395 scode != BLANK_CHECK && 396 scode != VOLUME_OVERFLOW && 397 SRpnt->cmd[0] != MODE_SENSE && 398 SRpnt->cmd[0] != TEST_UNIT_READY) { 399 400 __scsi_print_sense(STp->device, name, 401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 402 } 403 } 404 405 if (cmdstatp->fixed_format && 406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 407 if (STp->cln_sense_value) 408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 409 STp->cln_sense_mask) == STp->cln_sense_value); 410 else 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 412 STp->cln_sense_mask) != 0); 413 } 414 if (cmdstatp->have_sense && 415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 417 if (cmdstatp->have_sense && scode == UNIT_ATTENTION && cmdstatp->sense_hdr.asc == 0x29) 418 STp->pos_unknown = 1; /* ASC => power on / reset */ 419 420 STp->pos_unknown |= STp->device->was_reset; 421 422 if (cmdstatp->have_sense && 423 scode == RECOVERED_ERROR 424#if ST_RECOVERED_WRITE_FATAL 425 && SRpnt->cmd[0] != WRITE_6 426 && SRpnt->cmd[0] != WRITE_FILEMARKS 427#endif 428 ) { 429 STp->recover_count++; 430 STp->recover_reg++; 431 432 DEB( 433 if (debugging) { 434 if (SRpnt->cmd[0] == READ_6) 435 stp = "read"; 436 else if (SRpnt->cmd[0] == WRITE_6) 437 stp = "write"; 438 else 439 stp = "ioctl"; 440 st_printk(ST_DEB_MSG, STp, 441 "Recovered %s error (%d).\n", 442 stp, STp->recover_count); 443 } ) /* end DEB */ 444 445 if (cmdstatp->flags == 0) 446 return 0; 447 } 448 return (-EIO); 449} 450 451static struct st_request *st_allocate_request(struct scsi_tape *stp) 452{ 453 struct st_request *streq; 454 455 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 456 if (streq) 457 streq->stp = stp; 458 else { 459 st_printk(KERN_ERR, stp, 460 "Can't get SCSI request.\n"); 461 if (signal_pending(current)) 462 stp->buffer->syscall_result = -EINTR; 463 else 464 stp->buffer->syscall_result = -EBUSY; 465 } 466 467 return streq; 468} 469 470static void st_release_request(struct st_request *streq) 471{ 472 kfree(streq); 473} 474 475static void st_do_stats(struct scsi_tape *STp, struct request *req) 476{ 477 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); 478 ktime_t now; 479 480 now = ktime_get(); 481 if (scmd->cmnd[0] == WRITE_6) { 482 now = ktime_sub(now, STp->stats->write_time); 483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 485 atomic64_inc(&STp->stats->write_cnt); 486 if (scmd->result) { 487 atomic64_add(atomic_read(&STp->stats->last_write_size) 488 - STp->buffer->cmdstat.residual, 489 &STp->stats->write_byte_cnt); 490 if (STp->buffer->cmdstat.residual > 0) 491 atomic64_inc(&STp->stats->resid_cnt); 492 } else 493 atomic64_add(atomic_read(&STp->stats->last_write_size), 494 &STp->stats->write_byte_cnt); 495 } else if (scmd->cmnd[0] == READ_6) { 496 now = ktime_sub(now, STp->stats->read_time); 497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 499 atomic64_inc(&STp->stats->read_cnt); 500 if (scmd->result) { 501 atomic64_add(atomic_read(&STp->stats->last_read_size) 502 - STp->buffer->cmdstat.residual, 503 &STp->stats->read_byte_cnt); 504 if (STp->buffer->cmdstat.residual > 0) 505 atomic64_inc(&STp->stats->resid_cnt); 506 } else 507 atomic64_add(atomic_read(&STp->stats->last_read_size), 508 &STp->stats->read_byte_cnt); 509 } else { 510 now = ktime_sub(now, STp->stats->other_time); 511 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 512 atomic64_inc(&STp->stats->other_cnt); 513 } 514 atomic64_dec(&STp->stats->in_flight); 515} 516 517static enum rq_end_io_ret st_scsi_execute_end(struct request *req, 518 blk_status_t status) 519{ 520 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); 521 struct st_request *SRpnt = req->end_io_data; 522 struct scsi_tape *STp = SRpnt->stp; 523 struct bio *tmp; 524 525 STp->buffer->cmdstat.midlevel_result = SRpnt->result = scmd->result; 526 STp->buffer->cmdstat.residual = scmd->resid_len; 527 528 st_do_stats(STp, req); 529 530 tmp = SRpnt->bio; 531 if (scmd->sense_len) 532 memcpy(SRpnt->sense, scmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 533 if (SRpnt->waiting) 534 complete(SRpnt->waiting); 535 536 blk_rq_unmap_user(tmp); 537 blk_mq_free_request(req); 538 return RQ_END_IO_NONE; 539} 540 541static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 542 int data_direction, void *buffer, unsigned bufflen, 543 int timeout, int retries) 544{ 545 struct request *req; 546 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 547 int err = 0; 548 struct scsi_tape *STp = SRpnt->stp; 549 struct scsi_cmnd *scmd; 550 551 req = scsi_alloc_request(SRpnt->stp->device->request_queue, 552 data_direction == DMA_TO_DEVICE ? 553 REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 554 if (IS_ERR(req)) 555 return PTR_ERR(req); 556 scmd = blk_mq_rq_to_pdu(req); 557 req->rq_flags |= RQF_QUIET; 558 559 mdata->null_mapped = 1; 560 561 if (bufflen) { 562 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 563 GFP_KERNEL); 564 if (err) { 565 blk_mq_free_request(req); 566 return err; 567 } 568 } 569 570 atomic64_inc(&STp->stats->in_flight); 571 if (cmd[0] == WRITE_6) { 572 atomic_set(&STp->stats->last_write_size, bufflen); 573 STp->stats->write_time = ktime_get(); 574 } else if (cmd[0] == READ_6) { 575 atomic_set(&STp->stats->last_read_size, bufflen); 576 STp->stats->read_time = ktime_get(); 577 } else { 578 STp->stats->other_time = ktime_get(); 579 } 580 581 SRpnt->bio = req->bio; 582 scmd->cmd_len = COMMAND_SIZE(cmd[0]); 583 memcpy(scmd->cmnd, cmd, scmd->cmd_len); 584 req->timeout = timeout; 585 scmd->allowed = retries; 586 req->end_io = st_scsi_execute_end; 587 req->end_io_data = SRpnt; 588 589 blk_execute_rq_nowait(req, true); 590 return 0; 591} 592 593/* Do the scsi command. Waits until command performed if do_wait is true. 594 Otherwise write_behind_check() is used to check that the command 595 has finished. */ 596static struct st_request * 597st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 598 int bytes, int direction, int timeout, int retries, int do_wait) 599{ 600 struct completion *waiting; 601 struct rq_map_data *mdata = &STp->buffer->map_data; 602 int ret; 603 604 /* if async, make sure there's no command outstanding */ 605 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 606 st_printk(KERN_ERR, STp, 607 "Async command already active.\n"); 608 if (signal_pending(current)) 609 (STp->buffer)->syscall_result = (-EINTR); 610 else 611 (STp->buffer)->syscall_result = (-EBUSY); 612 return NULL; 613 } 614 615 if (!SRpnt) { 616 SRpnt = st_allocate_request(STp); 617 if (!SRpnt) 618 return NULL; 619 } 620 621 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 622 which IO is outstanding. It's nulled out when the IO completes. */ 623 if (!do_wait) 624 (STp->buffer)->last_SRpnt = SRpnt; 625 626 waiting = &STp->wait; 627 init_completion(waiting); 628 SRpnt->waiting = waiting; 629 630 if (STp->buffer->do_dio) { 631 mdata->page_order = 0; 632 mdata->nr_entries = STp->buffer->sg_segs; 633 mdata->pages = STp->buffer->mapped_pages; 634 } else { 635 mdata->page_order = STp->buffer->reserved_page_order; 636 mdata->nr_entries = 637 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 638 mdata->pages = STp->buffer->reserved_pages; 639 mdata->offset = 0; 640 } 641 642 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 643 STp->buffer->cmdstat.have_sense = 0; 644 STp->buffer->syscall_result = 0; 645 646 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 647 retries); 648 if (ret) { 649 /* could not allocate the buffer or request was too large */ 650 (STp->buffer)->syscall_result = (-EBUSY); 651 (STp->buffer)->last_SRpnt = NULL; 652 } else if (do_wait) { 653 wait_for_completion(waiting); 654 SRpnt->waiting = NULL; 655 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 656 } 657 658 return SRpnt; 659} 660 661 662/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 663 write has been correct but EOM early warning reached, -EIO if write ended in 664 error or zero if write successful. Asynchronous writes are used only in 665 variable block mode. */ 666static int write_behind_check(struct scsi_tape * STp) 667{ 668 int retval = 0; 669 struct st_buffer *STbuffer; 670 struct st_partstat *STps; 671 struct st_cmdstatus *cmdstatp; 672 struct st_request *SRpnt; 673 674 STbuffer = STp->buffer; 675 if (!STbuffer->writing) 676 return 0; 677 678 DEB( 679 if (STp->write_pending) 680 STp->nbr_waits++; 681 else 682 STp->nbr_finished++; 683 ) /* end DEB */ 684 685 wait_for_completion(&(STp->wait)); 686 SRpnt = STbuffer->last_SRpnt; 687 STbuffer->last_SRpnt = NULL; 688 SRpnt->waiting = NULL; 689 690 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 691 st_release_request(SRpnt); 692 693 STbuffer->buffer_bytes -= STbuffer->writing; 694 STps = &(STp->ps[STp->partition]); 695 if (STps->drv_block >= 0) { 696 if (STp->block_size == 0) 697 STps->drv_block++; 698 else 699 STps->drv_block += STbuffer->writing / STp->block_size; 700 } 701 702 cmdstatp = &STbuffer->cmdstat; 703 if (STbuffer->syscall_result) { 704 retval = -EIO; 705 if (cmdstatp->have_sense && !cmdstatp->deferred && 706 (cmdstatp->flags & SENSE_EOM) && 707 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 708 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 709 /* EOM at write-behind, has all data been written? */ 710 if (!cmdstatp->remainder_valid || 711 cmdstatp->uremainder64 == 0) 712 retval = -ENOSPC; 713 } 714 if (retval == -EIO) 715 STps->drv_block = -1; 716 } 717 STbuffer->writing = 0; 718 719 DEB(if (debugging && retval) 720 st_printk(ST_DEB_MSG, STp, 721 "Async write error %x, return value %d.\n", 722 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 723 724 return retval; 725} 726 727 728/* Step over EOF if it has been inadvertently crossed (ioctl not used because 729 it messes up the block number). */ 730static int cross_eof(struct scsi_tape * STp, int forward) 731{ 732 struct st_request *SRpnt; 733 unsigned char cmd[MAX_COMMAND_SIZE]; 734 735 cmd[0] = SPACE; 736 cmd[1] = 0x01; /* Space FileMarks */ 737 if (forward) { 738 cmd[2] = cmd[3] = 0; 739 cmd[4] = 1; 740 } else 741 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 742 cmd[5] = 0; 743 744 DEBC_printk(STp, "Stepping over filemark %s.\n", 745 forward ? "forward" : "backward"); 746 747 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 748 STp->device->request_queue->rq_timeout, 749 MAX_RETRIES, 1); 750 if (!SRpnt) 751 return (STp->buffer)->syscall_result; 752 753 st_release_request(SRpnt); 754 SRpnt = NULL; 755 756 if ((STp->buffer)->cmdstat.midlevel_result != 0) 757 st_printk(KERN_ERR, STp, 758 "Stepping over filemark %s failed.\n", 759 forward ? "forward" : "backward"); 760 761 return (STp->buffer)->syscall_result; 762} 763 764 765/* Flush the write buffer (never need to write if variable blocksize). */ 766static int st_flush_write_buffer(struct scsi_tape * STp) 767{ 768 int transfer, blks; 769 int result; 770 unsigned char cmd[MAX_COMMAND_SIZE]; 771 struct st_request *SRpnt; 772 struct st_partstat *STps; 773 774 result = write_behind_check(STp); 775 if (result) 776 return result; 777 778 result = 0; 779 if (STp->dirty == 1) { 780 781 transfer = STp->buffer->buffer_bytes; 782 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 783 784 memset(cmd, 0, MAX_COMMAND_SIZE); 785 cmd[0] = WRITE_6; 786 cmd[1] = 1; 787 blks = transfer / STp->block_size; 788 cmd[2] = blks >> 16; 789 cmd[3] = blks >> 8; 790 cmd[4] = blks; 791 792 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 793 STp->device->request_queue->rq_timeout, 794 MAX_WRITE_RETRIES, 1); 795 if (!SRpnt) 796 return (STp->buffer)->syscall_result; 797 798 STps = &(STp->ps[STp->partition]); 799 if ((STp->buffer)->syscall_result != 0) { 800 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 801 802 if (cmdstatp->have_sense && !cmdstatp->deferred && 803 (cmdstatp->flags & SENSE_EOM) && 804 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 805 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 806 (!cmdstatp->remainder_valid || 807 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 808 STp->dirty = 0; 809 (STp->buffer)->buffer_bytes = 0; 810 if (STps->drv_block >= 0) 811 STps->drv_block += blks; 812 result = (-ENOSPC); 813 } else { 814 st_printk(KERN_ERR, STp, "Error on flush.\n"); 815 STps->drv_block = (-1); 816 result = (-EIO); 817 } 818 } else { 819 if (STps->drv_block >= 0) 820 STps->drv_block += blks; 821 STp->dirty = 0; 822 (STp->buffer)->buffer_bytes = 0; 823 } 824 st_release_request(SRpnt); 825 SRpnt = NULL; 826 } 827 return result; 828} 829 830 831/* Flush the tape buffer. The tape will be positioned correctly unless 832 seek_next is true. */ 833static int flush_buffer(struct scsi_tape *STp, int seek_next) 834{ 835 int backspace, result; 836 struct st_partstat *STps; 837 838 /* 839 * If there was a bus reset, block further access 840 * to this device. 841 */ 842 if (STp->pos_unknown) 843 return (-EIO); 844 845 if (STp->ready != ST_READY) 846 return 0; 847 STps = &(STp->ps[STp->partition]); 848 if (STps->rw == ST_WRITING) /* Writing */ 849 return st_flush_write_buffer(STp); 850 851 if (STp->block_size == 0) 852 return 0; 853 854 backspace = ((STp->buffer)->buffer_bytes + 855 (STp->buffer)->read_pointer) / STp->block_size - 856 ((STp->buffer)->read_pointer + STp->block_size - 1) / 857 STp->block_size; 858 (STp->buffer)->buffer_bytes = 0; 859 (STp->buffer)->read_pointer = 0; 860 result = 0; 861 if (!seek_next) { 862 if (STps->eof == ST_FM_HIT) { 863 result = cross_eof(STp, 0); /* Back over the EOF hit */ 864 if (!result) 865 STps->eof = ST_NOEOF; 866 else { 867 if (STps->drv_file >= 0) 868 STps->drv_file++; 869 STps->drv_block = 0; 870 } 871 } 872 if (!result && backspace > 0) 873 result = st_int_ioctl(STp, MTBSR, backspace); 874 } else if (STps->eof == ST_FM_HIT) { 875 if (STps->drv_file >= 0) 876 STps->drv_file++; 877 STps->drv_block = 0; 878 STps->eof = ST_NOEOF; 879 } 880 return result; 881 882} 883 884/* Set the mode parameters */ 885static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 886{ 887 int set_it = 0; 888 unsigned long arg; 889 890 if (!STp->density_changed && 891 STm->default_density >= 0 && 892 STm->default_density != STp->density) { 893 arg = STm->default_density; 894 set_it = 1; 895 } else 896 arg = STp->density; 897 arg <<= MT_ST_DENSITY_SHIFT; 898 if (!STp->blksize_changed && 899 STm->default_blksize >= 0 && 900 STm->default_blksize != STp->block_size) { 901 arg |= STm->default_blksize; 902 set_it = 1; 903 } else 904 arg |= STp->block_size; 905 if (set_it && 906 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 907 st_printk(KERN_WARNING, STp, 908 "Can't set default block size to %d bytes " 909 "and density %x.\n", 910 STm->default_blksize, STm->default_density); 911 if (modes_defined) 912 return (-EINVAL); 913 } 914 return 0; 915} 916 917 918/* Lock or unlock the drive door. Don't use when st_request allocated. */ 919static int do_door_lock(struct scsi_tape * STp, int do_lock) 920{ 921 int retval; 922 923 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 924 925 retval = scsi_set_medium_removal(STp->device, 926 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 927 if (!retval) 928 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 929 else 930 STp->door_locked = ST_LOCK_FAILS; 931 return retval; 932} 933 934 935/* Set the internal state after reset */ 936static void reset_state(struct scsi_tape *STp) 937{ 938 int i; 939 struct st_partstat *STps; 940 941 STp->pos_unknown = 0; 942 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 943 STps = &(STp->ps[i]); 944 STps->rw = ST_IDLE; 945 STps->eof = ST_NOEOF; 946 STps->at_sm = 0; 947 STps->last_block_valid = 0; 948 STps->drv_block = -1; 949 STps->drv_file = -1; 950 } 951 if (STp->can_partitions) { 952 STp->partition = find_partition(STp); 953 if (STp->partition < 0) 954 STp->partition = 0; 955 STp->new_partition = STp->partition; 956 } 957} 958 959/* Test if the drive is ready. Returns either one of the codes below or a negative system 960 error code. */ 961#define CHKRES_READY 0 962#define CHKRES_NEW_SESSION 1 963#define CHKRES_NOT_READY 2 964#define CHKRES_NO_TAPE 3 965 966#define MAX_ATTENTIONS 10 967 968static int test_ready(struct scsi_tape *STp, int do_wait) 969{ 970 int attentions, waits, max_wait, scode; 971 int retval = CHKRES_READY, new_session = 0; 972 unsigned char cmd[MAX_COMMAND_SIZE]; 973 struct st_request *SRpnt = NULL; 974 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 975 976 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 977 978 for (attentions=waits=0; ; ) { 979 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 980 cmd[0] = TEST_UNIT_READY; 981 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 982 STp->long_timeout, MAX_READY_RETRIES, 1); 983 984 if (!SRpnt) { 985 retval = (STp->buffer)->syscall_result; 986 break; 987 } 988 989 if (cmdstatp->have_sense) { 990 991 scode = cmdstatp->sense_hdr.sense_key; 992 993 if (scode == UNIT_ATTENTION) { /* New media? */ 994 new_session = 1; 995 if (attentions < MAX_ATTENTIONS) { 996 attentions++; 997 continue; 998 } 999 else { 1000 retval = (-EIO); 1001 break; 1002 } 1003 } 1004 1005 if (scode == NOT_READY) { 1006 if (waits < max_wait) { 1007 if (msleep_interruptible(1000)) { 1008 retval = (-EINTR); 1009 break; 1010 } 1011 waits++; 1012 continue; 1013 } 1014 else { 1015 if ((STp->device)->scsi_level >= SCSI_2 && 1016 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1017 retval = CHKRES_NO_TAPE; 1018 else 1019 retval = CHKRES_NOT_READY; 1020 break; 1021 } 1022 } 1023 } 1024 1025 retval = (STp->buffer)->syscall_result; 1026 if (!retval) 1027 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1028 break; 1029 } 1030 1031 if (SRpnt != NULL) 1032 st_release_request(SRpnt); 1033 return retval; 1034} 1035 1036 1037/* See if the drive is ready and gather information about the tape. Return values: 1038 < 0 negative error code from errno.h 1039 0 drive ready 1040 1 drive not ready (possibly no tape) 1041*/ 1042static int check_tape(struct scsi_tape *STp, struct file *filp) 1043{ 1044 int i, retval, new_session = 0, do_wait; 1045 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1046 unsigned short st_flags = filp->f_flags; 1047 struct st_request *SRpnt = NULL; 1048 struct st_modedef *STm; 1049 struct st_partstat *STps; 1050 struct inode *inode = file_inode(filp); 1051 int mode = TAPE_MODE(inode); 1052 1053 STp->ready = ST_READY; 1054 1055 if (mode != STp->current_mode) { 1056 DEBC_printk(STp, "Mode change from %d to %d.\n", 1057 STp->current_mode, mode); 1058 new_session = 1; 1059 STp->current_mode = mode; 1060 } 1061 STm = &(STp->modes[STp->current_mode]); 1062 1063 saved_cleaning = STp->cleaning_req; 1064 STp->cleaning_req = 0; 1065 1066 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1067 retval = test_ready(STp, do_wait); 1068 1069 if (retval < 0) 1070 goto err_out; 1071 1072 if (retval == CHKRES_NEW_SESSION) { 1073 STp->pos_unknown = 0; 1074 STp->partition = STp->new_partition = 0; 1075 if (STp->can_partitions) 1076 STp->nbr_partitions = 1; /* This guess will be updated later 1077 if necessary */ 1078 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1079 STps = &(STp->ps[i]); 1080 STps->rw = ST_IDLE; 1081 STps->eof = ST_NOEOF; 1082 STps->at_sm = 0; 1083 STps->last_block_valid = 0; 1084 STps->drv_block = 0; 1085 STps->drv_file = 0; 1086 } 1087 new_session = 1; 1088 } 1089 else { 1090 STp->cleaning_req |= saved_cleaning; 1091 1092 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1093 if (retval == CHKRES_NO_TAPE) 1094 STp->ready = ST_NO_TAPE; 1095 else 1096 STp->ready = ST_NOT_READY; 1097 1098 STp->density = 0; /* Clear the erroneous "residue" */ 1099 STp->write_prot = 0; 1100 STp->block_size = 0; 1101 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1102 STp->partition = STp->new_partition = 0; 1103 STp->door_locked = ST_UNLOCKED; 1104 return CHKRES_NOT_READY; 1105 } 1106 } 1107 1108 if (STp->omit_blklims) 1109 STp->min_block = STp->max_block = (-1); 1110 else { 1111 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1112 cmd[0] = READ_BLOCK_LIMITS; 1113 1114 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1115 STp->device->request_queue->rq_timeout, 1116 MAX_READY_RETRIES, 1); 1117 if (!SRpnt) { 1118 retval = (STp->buffer)->syscall_result; 1119 goto err_out; 1120 } 1121 1122 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1123 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1124 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1125 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1126 (STp->buffer)->b_data[5]; 1127 if ( DEB( debugging || ) !STp->inited) 1128 st_printk(KERN_INFO, STp, 1129 "Block limits %d - %d bytes.\n", 1130 STp->min_block, STp->max_block); 1131 } else { 1132 STp->min_block = STp->max_block = (-1); 1133 DEBC_printk(STp, "Can't read block limits.\n"); 1134 } 1135 } 1136 1137 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1138 cmd[0] = MODE_SENSE; 1139 cmd[4] = 12; 1140 1141 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1142 STp->device->request_queue->rq_timeout, 1143 MAX_READY_RETRIES, 1); 1144 if (!SRpnt) { 1145 retval = (STp->buffer)->syscall_result; 1146 goto err_out; 1147 } 1148 1149 if ((STp->buffer)->syscall_result != 0) { 1150 DEBC_printk(STp, "No Mode Sense.\n"); 1151 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1152 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1153 STp->drv_write_prot = 0; 1154 } else { 1155 DEBC_printk(STp,"Mode sense. Length %d, " 1156 "medium %x, WBS %x, BLL %d\n", 1157 (STp->buffer)->b_data[0], 1158 (STp->buffer)->b_data[1], 1159 (STp->buffer)->b_data[2], 1160 (STp->buffer)->b_data[3]); 1161 1162 if ((STp->buffer)->b_data[3] >= 8) { 1163 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1164 STp->density = (STp->buffer)->b_data[4]; 1165 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1166 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1167 DEBC_printk(STp, "Density %x, tape length: %x, " 1168 "drv buffer: %d\n", 1169 STp->density, 1170 (STp->buffer)->b_data[5] * 65536 + 1171 (STp->buffer)->b_data[6] * 256 + 1172 (STp->buffer)->b_data[7], 1173 STp->drv_buffer); 1174 } 1175 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1176 if (!STp->drv_buffer && STp->immediate_filemark) { 1177 st_printk(KERN_WARNING, STp, 1178 "non-buffered tape: disabling " 1179 "writing immediate filemarks\n"); 1180 STp->immediate_filemark = 0; 1181 } 1182 } 1183 st_release_request(SRpnt); 1184 SRpnt = NULL; 1185 STp->inited = 1; 1186 1187 if (STp->block_size > 0) 1188 (STp->buffer)->buffer_blocks = 1189 (STp->buffer)->buffer_size / STp->block_size; 1190 else 1191 (STp->buffer)->buffer_blocks = 1; 1192 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1193 1194 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1195 STp->block_size, (STp->buffer)->buffer_size, 1196 (STp->buffer)->buffer_blocks); 1197 1198 if (STp->drv_write_prot) { 1199 STp->write_prot = 1; 1200 1201 DEBC_printk(STp, "Write protected\n"); 1202 1203 if (do_wait && 1204 ((st_flags & O_ACCMODE) == O_WRONLY || 1205 (st_flags & O_ACCMODE) == O_RDWR)) { 1206 retval = (-EROFS); 1207 goto err_out; 1208 } 1209 } 1210 1211 if (STp->can_partitions && STp->nbr_partitions < 1) { 1212 /* This code is reached when the device is opened for the first time 1213 after the driver has been initialized with tape in the drive and the 1214 partition support has been enabled. */ 1215 DEBC_printk(STp, "Updating partition number in status.\n"); 1216 if ((STp->partition = find_partition(STp)) < 0) { 1217 retval = STp->partition; 1218 goto err_out; 1219 } 1220 STp->new_partition = STp->partition; 1221 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1222 } 1223 1224 if (new_session) { /* Change the drive parameters for the new mode */ 1225 STp->density_changed = STp->blksize_changed = 0; 1226 STp->compression_changed = 0; 1227 if (!(STm->defaults_for_writes) && 1228 (retval = set_mode_densblk(STp, STm)) < 0) 1229 goto err_out; 1230 1231 if (STp->default_drvbuffer != 0xff) { 1232 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1233 st_printk(KERN_WARNING, STp, 1234 "Can't set default drive " 1235 "buffering to %d.\n", 1236 STp->default_drvbuffer); 1237 } 1238 } 1239 1240 return CHKRES_READY; 1241 1242 err_out: 1243 return retval; 1244} 1245 1246 1247 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1248 module count. */ 1249static int st_open(struct inode *inode, struct file *filp) 1250{ 1251 int i, retval = (-EIO); 1252 int resumed = 0; 1253 struct scsi_tape *STp; 1254 struct st_partstat *STps; 1255 int dev = TAPE_NR(inode); 1256 1257 /* 1258 * We really want to do nonseekable_open(inode, filp); here, but some 1259 * versions of tar incorrectly call lseek on tapes and bail out if that 1260 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1261 */ 1262 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1263 1264 if (!(STp = scsi_tape_get(dev))) { 1265 return -ENXIO; 1266 } 1267 1268 filp->private_data = STp; 1269 1270 spin_lock(&st_use_lock); 1271 if (STp->in_use) { 1272 spin_unlock(&st_use_lock); 1273 DEBC_printk(STp, "Device already in use.\n"); 1274 scsi_tape_put(STp); 1275 return (-EBUSY); 1276 } 1277 1278 STp->in_use = 1; 1279 spin_unlock(&st_use_lock); 1280 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1281 1282 if (scsi_autopm_get_device(STp->device) < 0) { 1283 retval = -EIO; 1284 goto err_out; 1285 } 1286 resumed = 1; 1287 if (!scsi_block_when_processing_errors(STp->device)) { 1288 retval = (-ENXIO); 1289 goto err_out; 1290 } 1291 1292 /* See that we have at least a one page buffer available */ 1293 if (!enlarge_buffer(STp->buffer, PAGE_SIZE)) { 1294 st_printk(KERN_WARNING, STp, 1295 "Can't allocate one page tape buffer.\n"); 1296 retval = (-EOVERFLOW); 1297 goto err_out; 1298 } 1299 1300 (STp->buffer)->cleared = 0; 1301 (STp->buffer)->writing = 0; 1302 (STp->buffer)->syscall_result = 0; 1303 1304 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1305 1306 STp->dirty = 0; 1307 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1308 STps = &(STp->ps[i]); 1309 STps->rw = ST_IDLE; 1310 } 1311 STp->try_dio_now = STp->try_dio; 1312 STp->recover_count = 0; 1313 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1314 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1315 1316 retval = check_tape(STp, filp); 1317 if (retval < 0) 1318 goto err_out; 1319 if ((filp->f_flags & O_NONBLOCK) == 0 && 1320 retval != CHKRES_READY) { 1321 if (STp->ready == NO_TAPE) 1322 retval = (-ENOMEDIUM); 1323 else 1324 retval = (-EIO); 1325 goto err_out; 1326 } 1327 return 0; 1328 1329 err_out: 1330 normalize_buffer(STp->buffer); 1331 spin_lock(&st_use_lock); 1332 STp->in_use = 0; 1333 spin_unlock(&st_use_lock); 1334 if (resumed) 1335 scsi_autopm_put_device(STp->device); 1336 scsi_tape_put(STp); 1337 return retval; 1338 1339} 1340 1341 1342/* Flush the tape buffer before close */ 1343static int st_flush(struct file *filp, fl_owner_t id) 1344{ 1345 int result = 0, result2; 1346 unsigned char cmd[MAX_COMMAND_SIZE]; 1347 struct st_request *SRpnt; 1348 struct scsi_tape *STp = filp->private_data; 1349 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1350 struct st_partstat *STps = &(STp->ps[STp->partition]); 1351 1352 if (file_count(filp) > 1) 1353 return 0; 1354 1355 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1356 result = st_flush_write_buffer(STp); 1357 if (result != 0 && result != (-ENOSPC)) 1358 goto out; 1359 } 1360 1361 if (STp->can_partitions && 1362 (result2 = switch_partition(STp)) < 0) { 1363 DEBC_printk(STp, "switch_partition at close failed.\n"); 1364 if (result == 0) 1365 result = result2; 1366 goto out; 1367 } 1368 1369 DEBC( if (STp->nbr_requests) 1370 st_printk(KERN_DEBUG, STp, 1371 "Number of r/w requests %d, dio used in %d, " 1372 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1373 STp->nbr_pages)); 1374 1375 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1376 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1377 1378#if DEBUG 1379 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1380 STp->nbr_waits, STp->nbr_finished); 1381#endif 1382 memset(cmd, 0, MAX_COMMAND_SIZE); 1383 cmd[0] = WRITE_FILEMARKS; 1384 if (STp->immediate_filemark) 1385 cmd[1] = 1; 1386 cmd[4] = 1 + STp->two_fm; 1387 1388 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1389 STp->device->request_queue->rq_timeout, 1390 MAX_WRITE_RETRIES, 1); 1391 if (!SRpnt) { 1392 result = (STp->buffer)->syscall_result; 1393 goto out; 1394 } 1395 1396 if (STp->buffer->syscall_result == 0 || 1397 (cmdstatp->have_sense && !cmdstatp->deferred && 1398 (cmdstatp->flags & SENSE_EOM) && 1399 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1400 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1401 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1402 /* Write successful at EOM */ 1403 st_release_request(SRpnt); 1404 SRpnt = NULL; 1405 if (STps->drv_file >= 0) 1406 STps->drv_file++; 1407 STps->drv_block = 0; 1408 if (STp->two_fm) 1409 cross_eof(STp, 0); 1410 STps->eof = ST_FM; 1411 } 1412 else { /* Write error */ 1413 st_release_request(SRpnt); 1414 SRpnt = NULL; 1415 st_printk(KERN_ERR, STp, 1416 "Error on write filemark.\n"); 1417 if (result == 0) 1418 result = (-EIO); 1419 } 1420 1421 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1422 } else if (!STp->rew_at_close) { 1423 STps = &(STp->ps[STp->partition]); 1424 if (!STm->sysv || STps->rw != ST_READING) { 1425 if (STp->can_bsr) 1426 result = flush_buffer(STp, 0); 1427 else if (STps->eof == ST_FM_HIT) { 1428 result = cross_eof(STp, 0); 1429 if (result) { 1430 if (STps->drv_file >= 0) 1431 STps->drv_file++; 1432 STps->drv_block = 0; 1433 STps->eof = ST_FM; 1434 } else 1435 STps->eof = ST_NOEOF; 1436 } 1437 } else if ((STps->eof == ST_NOEOF && 1438 !(result = cross_eof(STp, 1))) || 1439 STps->eof == ST_FM_HIT) { 1440 if (STps->drv_file >= 0) 1441 STps->drv_file++; 1442 STps->drv_block = 0; 1443 STps->eof = ST_FM; 1444 } 1445 } 1446 1447 out: 1448 if (STp->rew_at_close) { 1449 result2 = st_int_ioctl(STp, MTREW, 1); 1450 if (result == 0) 1451 result = result2; 1452 } 1453 return result; 1454} 1455 1456 1457/* Close the device and release it. BKL is not needed: this is the only thread 1458 accessing this tape. */ 1459static int st_release(struct inode *inode, struct file *filp) 1460{ 1461 struct scsi_tape *STp = filp->private_data; 1462 1463 if (STp->door_locked == ST_LOCKED_AUTO) 1464 do_door_lock(STp, 0); 1465 1466 normalize_buffer(STp->buffer); 1467 spin_lock(&st_use_lock); 1468 STp->in_use = 0; 1469 spin_unlock(&st_use_lock); 1470 scsi_autopm_put_device(STp->device); 1471 scsi_tape_put(STp); 1472 1473 return 0; 1474} 1475 1476/* The checks common to both reading and writing */ 1477static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1478{ 1479 ssize_t retval = 0; 1480 1481 /* 1482 * If we are in the middle of error recovery, don't let anyone 1483 * else try and use this device. Also, if error recovery fails, it 1484 * may try and take the device offline, in which case all further 1485 * access to the device is prohibited. 1486 */ 1487 if (!scsi_block_when_processing_errors(STp->device)) { 1488 retval = (-ENXIO); 1489 goto out; 1490 } 1491 1492 if (STp->ready != ST_READY) { 1493 if (STp->ready == ST_NO_TAPE) 1494 retval = (-ENOMEDIUM); 1495 else 1496 retval = (-EIO); 1497 goto out; 1498 } 1499 1500 if (! STp->modes[STp->current_mode].defined) { 1501 retval = (-ENXIO); 1502 goto out; 1503 } 1504 1505 1506 /* 1507 * If there was a bus reset, block further access 1508 * to this device. 1509 */ 1510 if (STp->pos_unknown) { 1511 retval = (-EIO); 1512 goto out; 1513 } 1514 1515 if (count == 0) 1516 goto out; 1517 1518 DEB( 1519 if (!STp->in_use) { 1520 st_printk(ST_DEB_MSG, STp, 1521 "Incorrect device.\n"); 1522 retval = (-EIO); 1523 goto out; 1524 } ) /* end DEB */ 1525 1526 if (STp->can_partitions && 1527 (retval = switch_partition(STp)) < 0) 1528 goto out; 1529 1530 if (STp->block_size == 0 && STp->max_block > 0 && 1531 (count < STp->min_block || count > STp->max_block)) { 1532 retval = (-EINVAL); 1533 goto out; 1534 } 1535 1536 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1537 !do_door_lock(STp, 1)) 1538 STp->door_locked = ST_LOCKED_AUTO; 1539 1540 out: 1541 return retval; 1542} 1543 1544 1545static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1546 size_t count, int is_read) 1547{ 1548 int i, bufsize, retval = 0; 1549 struct st_buffer *STbp = STp->buffer; 1550 1551 if (is_read) 1552 i = STp->try_dio_now && try_rdio; 1553 else 1554 i = STp->try_dio_now && try_wdio; 1555 1556 if (i && ((unsigned long)buf & queue_dma_alignment( 1557 STp->device->request_queue)) == 0) { 1558 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1559 count, (is_read ? READ : WRITE)); 1560 if (i > 0) { 1561 STbp->do_dio = i; 1562 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1563 } 1564 else 1565 STbp->do_dio = 0; /* fall back to buffering with any error */ 1566 STbp->sg_segs = STbp->do_dio; 1567 DEB( 1568 if (STbp->do_dio) { 1569 STp->nbr_dio++; 1570 STp->nbr_pages += STbp->do_dio; 1571 } 1572 ) 1573 } else 1574 STbp->do_dio = 0; 1575 DEB( STp->nbr_requests++; ) 1576 1577 if (!STbp->do_dio) { 1578 if (STp->block_size) 1579 bufsize = STp->block_size > st_fixed_buffer_size ? 1580 STp->block_size : st_fixed_buffer_size; 1581 else { 1582 bufsize = count; 1583 /* Make sure that data from previous user is not leaked even if 1584 HBA does not return correct residual */ 1585 if (is_read && STp->sili && !STbp->cleared) 1586 clear_buffer(STbp); 1587 } 1588 1589 if (bufsize > STbp->buffer_size && 1590 !enlarge_buffer(STbp, bufsize)) { 1591 st_printk(KERN_WARNING, STp, 1592 "Can't allocate %d byte tape buffer.\n", 1593 bufsize); 1594 retval = (-EOVERFLOW); 1595 goto out; 1596 } 1597 if (STp->block_size) 1598 STbp->buffer_blocks = bufsize / STp->block_size; 1599 } 1600 1601 out: 1602 return retval; 1603} 1604 1605 1606/* Can be called more than once after each setup_buffer() */ 1607static void release_buffering(struct scsi_tape *STp, int is_read) 1608{ 1609 struct st_buffer *STbp; 1610 1611 STbp = STp->buffer; 1612 if (STbp->do_dio) { 1613 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1614 STbp->do_dio = 0; 1615 STbp->sg_segs = 0; 1616 } 1617} 1618 1619 1620/* Write command */ 1621static ssize_t 1622st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1623{ 1624 ssize_t total; 1625 ssize_t i, do_count, blks, transfer; 1626 ssize_t retval; 1627 int undone, retry_eot = 0, scode; 1628 int async_write; 1629 unsigned char cmd[MAX_COMMAND_SIZE]; 1630 const char __user *b_point; 1631 struct st_request *SRpnt = NULL; 1632 struct scsi_tape *STp = filp->private_data; 1633 struct st_modedef *STm; 1634 struct st_partstat *STps; 1635 struct st_buffer *STbp; 1636 1637 if (mutex_lock_interruptible(&STp->lock)) 1638 return -ERESTARTSYS; 1639 1640 retval = rw_checks(STp, filp, count); 1641 if (retval || count == 0) 1642 goto out; 1643 1644 /* Write must be integral number of blocks */ 1645 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1646 st_printk(KERN_WARNING, STp, 1647 "Write not multiple of tape block size.\n"); 1648 retval = (-EINVAL); 1649 goto out; 1650 } 1651 1652 STm = &(STp->modes[STp->current_mode]); 1653 STps = &(STp->ps[STp->partition]); 1654 1655 if (STp->write_prot) { 1656 retval = (-EACCES); 1657 goto out; 1658 } 1659 1660 1661 if (STps->rw == ST_READING) { 1662 retval = flush_buffer(STp, 0); 1663 if (retval) 1664 goto out; 1665 STps->rw = ST_WRITING; 1666 } else if (STps->rw != ST_WRITING && 1667 STps->drv_file == 0 && STps->drv_block == 0) { 1668 if ((retval = set_mode_densblk(STp, STm)) < 0) 1669 goto out; 1670 if (STm->default_compression != ST_DONT_TOUCH && 1671 !(STp->compression_changed)) { 1672 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1673 st_printk(KERN_WARNING, STp, 1674 "Can't set default compression.\n"); 1675 if (modes_defined) { 1676 retval = (-EINVAL); 1677 goto out; 1678 } 1679 } 1680 } 1681 } 1682 1683 STbp = STp->buffer; 1684 i = write_behind_check(STp); 1685 if (i) { 1686 if (i == -ENOSPC) 1687 STps->eof = ST_EOM_OK; 1688 else 1689 STps->eof = ST_EOM_ERROR; 1690 } 1691 1692 if (STps->eof == ST_EOM_OK) { 1693 STps->eof = ST_EOD_1; /* allow next write */ 1694 retval = (-ENOSPC); 1695 goto out; 1696 } 1697 else if (STps->eof == ST_EOM_ERROR) { 1698 retval = (-EIO); 1699 goto out; 1700 } 1701 1702 /* Check the buffer readability in cases where copy_user might catch 1703 the problems after some tape movement. */ 1704 if (STp->block_size != 0 && 1705 !STbp->do_dio && 1706 (copy_from_user(&i, buf, 1) != 0 || 1707 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1708 retval = (-EFAULT); 1709 goto out; 1710 } 1711 1712 retval = setup_buffering(STp, buf, count, 0); 1713 if (retval) 1714 goto out; 1715 1716 total = count; 1717 1718 memset(cmd, 0, MAX_COMMAND_SIZE); 1719 cmd[0] = WRITE_6; 1720 cmd[1] = (STp->block_size != 0); 1721 1722 STps->rw = ST_WRITING; 1723 1724 b_point = buf; 1725 while (count > 0 && !retry_eot) { 1726 1727 if (STbp->do_dio) { 1728 do_count = count; 1729 } 1730 else { 1731 if (STp->block_size == 0) 1732 do_count = count; 1733 else { 1734 do_count = STbp->buffer_blocks * STp->block_size - 1735 STbp->buffer_bytes; 1736 if (do_count > count) 1737 do_count = count; 1738 } 1739 1740 i = append_to_buffer(b_point, STbp, do_count); 1741 if (i) { 1742 retval = i; 1743 goto out; 1744 } 1745 } 1746 count -= do_count; 1747 b_point += do_count; 1748 1749 async_write = STp->block_size == 0 && !STbp->do_dio && 1750 STm->do_async_writes && STps->eof < ST_EOM_OK; 1751 1752 if (STp->block_size != 0 && STm->do_buffer_writes && 1753 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1754 STbp->buffer_bytes < STbp->buffer_size) { 1755 STp->dirty = 1; 1756 /* Don't write a buffer that is not full enough. */ 1757 if (!async_write && count == 0) 1758 break; 1759 } 1760 1761 retry_write: 1762 if (STp->block_size == 0) 1763 blks = transfer = do_count; 1764 else { 1765 if (!STbp->do_dio) 1766 blks = STbp->buffer_bytes; 1767 else 1768 blks = do_count; 1769 blks /= STp->block_size; 1770 transfer = blks * STp->block_size; 1771 } 1772 cmd[2] = blks >> 16; 1773 cmd[3] = blks >> 8; 1774 cmd[4] = blks; 1775 1776 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1777 STp->device->request_queue->rq_timeout, 1778 MAX_WRITE_RETRIES, !async_write); 1779 if (!SRpnt) { 1780 retval = STbp->syscall_result; 1781 goto out; 1782 } 1783 if (async_write && !STbp->syscall_result) { 1784 STbp->writing = transfer; 1785 STp->dirty = !(STbp->writing == 1786 STbp->buffer_bytes); 1787 SRpnt = NULL; /* Prevent releasing this request! */ 1788 DEB( STp->write_pending = 1; ) 1789 break; 1790 } 1791 1792 if (STbp->syscall_result != 0) { 1793 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1794 1795 DEBC_printk(STp, "Error on write:\n"); 1796 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1797 scode = cmdstatp->sense_hdr.sense_key; 1798 if (cmdstatp->remainder_valid) 1799 undone = (int)cmdstatp->uremainder64; 1800 else if (STp->block_size == 0 && 1801 scode == VOLUME_OVERFLOW) 1802 undone = transfer; 1803 else 1804 undone = 0; 1805 if (STp->block_size != 0) 1806 undone *= STp->block_size; 1807 if (undone <= do_count) { 1808 /* Only data from this write is not written */ 1809 count += undone; 1810 b_point -= undone; 1811 do_count -= undone; 1812 if (STp->block_size) 1813 blks = (transfer - undone) / STp->block_size; 1814 STps->eof = ST_EOM_OK; 1815 /* Continue in fixed block mode if all written 1816 in this request but still something left to write 1817 (retval left to zero) 1818 */ 1819 if (STp->block_size == 0 || 1820 undone > 0 || count == 0) 1821 retval = (-ENOSPC); /* EOM within current request */ 1822 DEBC_printk(STp, "EOM with %d " 1823 "bytes unwritten.\n", 1824 (int)count); 1825 } else { 1826 /* EOT within data buffered earlier (possible only 1827 in fixed block mode without direct i/o) */ 1828 if (!retry_eot && !cmdstatp->deferred && 1829 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1830 move_buffer_data(STp->buffer, transfer - undone); 1831 retry_eot = 1; 1832 if (STps->drv_block >= 0) { 1833 STps->drv_block += (transfer - undone) / 1834 STp->block_size; 1835 } 1836 STps->eof = ST_EOM_OK; 1837 DEBC_printk(STp, "Retry " 1838 "write of %d " 1839 "bytes at EOM.\n", 1840 STp->buffer->buffer_bytes); 1841 goto retry_write; 1842 } 1843 else { 1844 /* Either error within data buffered by driver or 1845 failed retry */ 1846 count -= do_count; 1847 blks = do_count = 0; 1848 STps->eof = ST_EOM_ERROR; 1849 STps->drv_block = (-1); /* Too cautious? */ 1850 retval = (-EIO); /* EOM for old data */ 1851 DEBC_printk(STp, "EOM with " 1852 "lost data.\n"); 1853 } 1854 } 1855 } else { 1856 count += do_count; 1857 STps->drv_block = (-1); /* Too cautious? */ 1858 retval = STbp->syscall_result; 1859 } 1860 1861 } 1862 1863 if (STps->drv_block >= 0) { 1864 if (STp->block_size == 0) 1865 STps->drv_block += (do_count > 0); 1866 else 1867 STps->drv_block += blks; 1868 } 1869 1870 STbp->buffer_bytes = 0; 1871 STp->dirty = 0; 1872 1873 if (retval || retry_eot) { 1874 if (count < total) 1875 retval = total - count; 1876 goto out; 1877 } 1878 } 1879 1880 if (STps->eof == ST_EOD_1) 1881 STps->eof = ST_EOM_OK; 1882 else if (STps->eof != ST_EOM_OK) 1883 STps->eof = ST_NOEOF; 1884 retval = total - count; 1885 1886 out: 1887 if (SRpnt != NULL) 1888 st_release_request(SRpnt); 1889 release_buffering(STp, 0); 1890 mutex_unlock(&STp->lock); 1891 1892 return retval; 1893} 1894 1895/* Read data from the tape. Returns zero in the normal case, one if the 1896 eof status has changed, and the negative error code in case of a 1897 fatal error. Otherwise updates the buffer and the eof state. 1898 1899 Does release user buffer mapping if it is set. 1900*/ 1901static long read_tape(struct scsi_tape *STp, long count, 1902 struct st_request ** aSRpnt) 1903{ 1904 int transfer, blks, bytes; 1905 unsigned char cmd[MAX_COMMAND_SIZE]; 1906 struct st_request *SRpnt; 1907 struct st_modedef *STm; 1908 struct st_partstat *STps; 1909 struct st_buffer *STbp; 1910 int retval = 0; 1911 1912 if (count == 0) 1913 return 0; 1914 1915 STm = &(STp->modes[STp->current_mode]); 1916 STps = &(STp->ps[STp->partition]); 1917 if (STps->eof == ST_FM_HIT) 1918 return 1; 1919 STbp = STp->buffer; 1920 1921 if (STp->block_size == 0) 1922 blks = bytes = count; 1923 else { 1924 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1925 blks = (STp->buffer)->buffer_blocks; 1926 bytes = blks * STp->block_size; 1927 } else { 1928 bytes = count; 1929 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1930 bytes = (STp->buffer)->buffer_size; 1931 blks = bytes / STp->block_size; 1932 bytes = blks * STp->block_size; 1933 } 1934 } 1935 1936 memset(cmd, 0, MAX_COMMAND_SIZE); 1937 cmd[0] = READ_6; 1938 cmd[1] = (STp->block_size != 0); 1939 if (!cmd[1] && STp->sili) 1940 cmd[1] |= 2; 1941 cmd[2] = blks >> 16; 1942 cmd[3] = blks >> 8; 1943 cmd[4] = blks; 1944 1945 SRpnt = *aSRpnt; 1946 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1947 STp->device->request_queue->rq_timeout, 1948 MAX_RETRIES, 1); 1949 release_buffering(STp, 1); 1950 *aSRpnt = SRpnt; 1951 if (!SRpnt) 1952 return STbp->syscall_result; 1953 1954 STbp->read_pointer = 0; 1955 STps->at_sm = 0; 1956 1957 /* Something to check */ 1958 if (STbp->syscall_result) { 1959 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1960 1961 retval = 1; 1962 DEBC_printk(STp, 1963 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1964 SRpnt->sense[0], SRpnt->sense[1], 1965 SRpnt->sense[2], SRpnt->sense[3], 1966 SRpnt->sense[4], SRpnt->sense[5], 1967 SRpnt->sense[6], SRpnt->sense[7]); 1968 if (cmdstatp->have_sense) { 1969 1970 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1971 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1972 1973 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1974 /* Compute the residual count */ 1975 if (cmdstatp->remainder_valid) 1976 transfer = (int)cmdstatp->uremainder64; 1977 else 1978 transfer = 0; 1979 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) { 1980 if (STp->block_size == 0) 1981 transfer = bytes; 1982 /* Some drives set ILI with MEDIUM ERROR */ 1983 cmdstatp->flags &= ~SENSE_ILI; 1984 } 1985 1986 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1987 if (STp->block_size == 0 && 1988 transfer < 0) { 1989 st_printk(KERN_NOTICE, STp, 1990 "Failed to read %d " 1991 "byte block with %d " 1992 "byte transfer.\n", 1993 bytes - transfer, 1994 bytes); 1995 if (STps->drv_block >= 0) 1996 STps->drv_block += 1; 1997 STbp->buffer_bytes = 0; 1998 return (-ENOMEM); 1999 } else if (STp->block_size == 0) { 2000 STbp->buffer_bytes = bytes - transfer; 2001 } else { 2002 st_release_request(SRpnt); 2003 SRpnt = *aSRpnt = NULL; 2004 if (transfer == blks) { /* We did not get anything, error */ 2005 st_printk(KERN_NOTICE, STp, 2006 "Incorrect " 2007 "block size.\n"); 2008 if (STps->drv_block >= 0) 2009 STps->drv_block += blks - transfer + 1; 2010 st_int_ioctl(STp, MTBSR, 1); 2011 return (-EIO); 2012 } 2013 /* We have some data, deliver it */ 2014 STbp->buffer_bytes = (blks - transfer) * 2015 STp->block_size; 2016 DEBC_printk(STp, "ILI but " 2017 "enough data " 2018 "received %ld " 2019 "%d.\n", count, 2020 STbp->buffer_bytes); 2021 if (STps->drv_block >= 0) 2022 STps->drv_block += 1; 2023 if (st_int_ioctl(STp, MTBSR, 1)) 2024 return (-EIO); 2025 } 2026 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 2027 if (STps->eof != ST_FM_HIT) 2028 STps->eof = ST_FM_HIT; 2029 else 2030 STps->eof = ST_EOD_2; 2031 if (STp->block_size == 0) 2032 STbp->buffer_bytes = 0; 2033 else 2034 STbp->buffer_bytes = 2035 bytes - transfer * STp->block_size; 2036 DEBC_printk(STp, "EOF detected (%d " 2037 "bytes read).\n", 2038 STbp->buffer_bytes); 2039 } else if (cmdstatp->flags & SENSE_EOM) { 2040 if (STps->eof == ST_FM) 2041 STps->eof = ST_EOD_1; 2042 else 2043 STps->eof = ST_EOM_OK; 2044 if (STp->block_size == 0) 2045 STbp->buffer_bytes = bytes - transfer; 2046 else 2047 STbp->buffer_bytes = 2048 bytes - transfer * STp->block_size; 2049 2050 DEBC_printk(STp, "EOM detected (%d " 2051 "bytes read).\n", 2052 STbp->buffer_bytes); 2053 } 2054 } 2055 /* end of EOF, EOM, ILI test */ 2056 else { /* nonzero sense key */ 2057 DEBC_printk(STp, "Tape error while reading.\n"); 2058 STps->drv_block = (-1); 2059 if (STps->eof == ST_FM && 2060 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 2061 DEBC_printk(STp, "Zero returned for " 2062 "first BLANK CHECK " 2063 "after EOF.\n"); 2064 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 2065 } else /* Some other extended sense code */ 2066 retval = (-EIO); 2067 } 2068 2069 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 2070 STbp->buffer_bytes = 0; 2071 } 2072 /* End of extended sense test */ 2073 else { /* Non-extended sense */ 2074 retval = STbp->syscall_result; 2075 } 2076 2077 } 2078 /* End of error handling */ 2079 else { /* Read successful */ 2080 STbp->buffer_bytes = bytes; 2081 if (STp->sili) /* In fixed block mode residual is always zero here */ 2082 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2083 } 2084 2085 if (STps->drv_block >= 0) { 2086 if (STp->block_size == 0) 2087 STps->drv_block++; 2088 else 2089 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2090 } 2091 return retval; 2092} 2093 2094 2095/* Read command */ 2096static ssize_t 2097st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2098{ 2099 ssize_t total; 2100 ssize_t retval = 0; 2101 ssize_t i, transfer; 2102 int special, do_dio = 0; 2103 struct st_request *SRpnt = NULL; 2104 struct scsi_tape *STp = filp->private_data; 2105 struct st_modedef *STm; 2106 struct st_partstat *STps; 2107 struct st_buffer *STbp = STp->buffer; 2108 2109 if (mutex_lock_interruptible(&STp->lock)) 2110 return -ERESTARTSYS; 2111 2112 retval = rw_checks(STp, filp, count); 2113 if (retval || count == 0) 2114 goto out; 2115 2116 STm = &(STp->modes[STp->current_mode]); 2117 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2118 if (!STm->do_read_ahead) { 2119 retval = (-EINVAL); /* Read must be integral number of blocks */ 2120 goto out; 2121 } 2122 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2123 } 2124 2125 STps = &(STp->ps[STp->partition]); 2126 if (STps->rw == ST_WRITING) { 2127 retval = flush_buffer(STp, 0); 2128 if (retval) 2129 goto out; 2130 STps->rw = ST_READING; 2131 } 2132 DEB( 2133 if (debugging && STps->eof != ST_NOEOF) 2134 st_printk(ST_DEB_MSG, STp, 2135 "EOF/EOM flag up (%d). Bytes %d\n", 2136 STps->eof, STbp->buffer_bytes); 2137 ) /* end DEB */ 2138 2139 retval = setup_buffering(STp, buf, count, 1); 2140 if (retval) 2141 goto out; 2142 do_dio = STbp->do_dio; 2143 2144 if (STbp->buffer_bytes == 0 && 2145 STps->eof >= ST_EOD_1) { 2146 if (STps->eof < ST_EOD) { 2147 STps->eof += 1; 2148 retval = 0; 2149 goto out; 2150 } 2151 retval = (-EIO); /* EOM or Blank Check */ 2152 goto out; 2153 } 2154 2155 if (do_dio) { 2156 /* Check the buffer writability before any tape movement. Don't alter 2157 buffer data. */ 2158 if (copy_from_user(&i, buf, 1) != 0 || 2159 copy_to_user(buf, &i, 1) != 0 || 2160 copy_from_user(&i, buf + count - 1, 1) != 0 || 2161 copy_to_user(buf + count - 1, &i, 1) != 0) { 2162 retval = (-EFAULT); 2163 goto out; 2164 } 2165 } 2166 2167 STps->rw = ST_READING; 2168 2169 2170 /* Loop until enough data in buffer or a special condition found */ 2171 for (total = 0, special = 0; total < count && !special;) { 2172 2173 /* Get new data if the buffer is empty */ 2174 if (STbp->buffer_bytes == 0) { 2175 special = read_tape(STp, count - total, &SRpnt); 2176 if (special < 0) { /* No need to continue read */ 2177 retval = special; 2178 goto out; 2179 } 2180 } 2181 2182 /* Move the data from driver buffer to user buffer */ 2183 if (STbp->buffer_bytes > 0) { 2184 DEB( 2185 if (debugging && STps->eof != ST_NOEOF) 2186 st_printk(ST_DEB_MSG, STp, 2187 "EOF up (%d). Left %d, needed %d.\n", 2188 STps->eof, STbp->buffer_bytes, 2189 (int)(count - total)); 2190 ) /* end DEB */ 2191 transfer = STbp->buffer_bytes < count - total ? 2192 STbp->buffer_bytes : count - total; 2193 if (!do_dio) { 2194 i = from_buffer(STbp, buf, transfer); 2195 if (i) { 2196 retval = i; 2197 goto out; 2198 } 2199 } 2200 buf += transfer; 2201 total += transfer; 2202 } 2203 2204 if (STp->block_size == 0) 2205 break; /* Read only one variable length block */ 2206 2207 } /* for (total = 0, special = 0; 2208 total < count && !special; ) */ 2209 2210 /* Change the eof state if no data from tape or buffer */ 2211 if (total == 0) { 2212 if (STps->eof == ST_FM_HIT) { 2213 STps->eof = ST_FM; 2214 STps->drv_block = 0; 2215 if (STps->drv_file >= 0) 2216 STps->drv_file++; 2217 } else if (STps->eof == ST_EOD_1) { 2218 STps->eof = ST_EOD_2; 2219 STps->drv_block = 0; 2220 if (STps->drv_file >= 0) 2221 STps->drv_file++; 2222 } else if (STps->eof == ST_EOD_2) 2223 STps->eof = ST_EOD; 2224 } else if (STps->eof == ST_FM) 2225 STps->eof = ST_NOEOF; 2226 retval = total; 2227 2228 out: 2229 if (SRpnt != NULL) { 2230 st_release_request(SRpnt); 2231 SRpnt = NULL; 2232 } 2233 if (do_dio) { 2234 release_buffering(STp, 1); 2235 STbp->buffer_bytes = 0; 2236 } 2237 mutex_unlock(&STp->lock); 2238 2239 return retval; 2240} 2241 2242 2243 2244DEB( 2245/* Set the driver options */ 2246static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) 2247{ 2248 if (debugging) { 2249 st_printk(KERN_INFO, STp, 2250 "Mode %d options: buffer writes: %d, " 2251 "async writes: %d, read ahead: %d\n", 2252 STp->current_mode, STm->do_buffer_writes, 2253 STm->do_async_writes, STm->do_read_ahead); 2254 st_printk(KERN_INFO, STp, 2255 " can bsr: %d, two FMs: %d, " 2256 "fast mteom: %d, auto lock: %d,\n", 2257 STp->can_bsr, STp->two_fm, STp->fast_mteom, 2258 STp->do_auto_lock); 2259 st_printk(KERN_INFO, STp, 2260 " defs for wr: %d, no block limits: %d, " 2261 "partitions: %d, s2 log: %d\n", 2262 STm->defaults_for_writes, STp->omit_blklims, 2263 STp->can_partitions, STp->scsi2_logical); 2264 st_printk(KERN_INFO, STp, 2265 " sysv: %d nowait: %d sili: %d " 2266 "nowait_filemark: %d\n", 2267 STm->sysv, STp->immediate, STp->sili, 2268 STp->immediate_filemark); 2269 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); 2270 } 2271} 2272 ) 2273 2274 2275static int st_set_options(struct scsi_tape *STp, long options) 2276{ 2277 int value; 2278 long code; 2279 struct st_modedef *STm; 2280 struct cdev *cd0, *cd1; 2281 struct device *d0, *d1; 2282 2283 STm = &(STp->modes[STp->current_mode]); 2284 if (!STm->defined) { 2285 cd0 = STm->cdevs[0]; 2286 cd1 = STm->cdevs[1]; 2287 d0 = STm->devs[0]; 2288 d1 = STm->devs[1]; 2289 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2290 STm->cdevs[0] = cd0; 2291 STm->cdevs[1] = cd1; 2292 STm->devs[0] = d0; 2293 STm->devs[1] = d1; 2294 modes_defined = 1; 2295 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", 2296 STp->current_mode); 2297 } 2298 2299 code = options & MT_ST_OPTIONS; 2300 if (code == MT_ST_BOOLEANS) { 2301 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2302 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2303 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2304 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2305 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2306 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2307 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2308 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2309 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2310 if ((STp->device)->scsi_level >= SCSI_2) 2311 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2312 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2313 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2314 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2315 STm->sysv = (options & MT_ST_SYSV) != 0; 2316 STp->sili = (options & MT_ST_SILI) != 0; 2317 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2318 st_log_options(STp, STm); ) 2319 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2320 value = (code == MT_ST_SETBOOLEANS); 2321 if ((options & MT_ST_BUFFER_WRITES) != 0) 2322 STm->do_buffer_writes = value; 2323 if ((options & MT_ST_ASYNC_WRITES) != 0) 2324 STm->do_async_writes = value; 2325 if ((options & MT_ST_DEF_WRITES) != 0) 2326 STm->defaults_for_writes = value; 2327 if ((options & MT_ST_READ_AHEAD) != 0) 2328 STm->do_read_ahead = value; 2329 if ((options & MT_ST_TWO_FM) != 0) 2330 STp->two_fm = value; 2331 if ((options & MT_ST_FAST_MTEOM) != 0) 2332 STp->fast_mteom = value; 2333 if ((options & MT_ST_AUTO_LOCK) != 0) 2334 STp->do_auto_lock = value; 2335 if ((options & MT_ST_CAN_BSR) != 0) 2336 STp->can_bsr = value; 2337 if ((options & MT_ST_NO_BLKLIMS) != 0) 2338 STp->omit_blklims = value; 2339 if ((STp->device)->scsi_level >= SCSI_2 && 2340 (options & MT_ST_CAN_PARTITIONS) != 0) 2341 STp->can_partitions = value; 2342 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2343 STp->scsi2_logical = value; 2344 if ((options & MT_ST_NOWAIT) != 0) 2345 STp->immediate = value; 2346 if ((options & MT_ST_NOWAIT_EOF) != 0) 2347 STp->immediate_filemark = value; 2348 if ((options & MT_ST_SYSV) != 0) 2349 STm->sysv = value; 2350 if ((options & MT_ST_SILI) != 0) 2351 STp->sili = value; 2352 DEB( 2353 if ((options & MT_ST_DEBUGGING) != 0) 2354 debugging = value; 2355 st_log_options(STp, STm); ) 2356 } else if (code == MT_ST_WRITE_THRESHOLD) { 2357 /* Retained for compatibility */ 2358 } else if (code == MT_ST_DEF_BLKSIZE) { 2359 value = (options & ~MT_ST_OPTIONS); 2360 if (value == ~MT_ST_OPTIONS) { 2361 STm->default_blksize = (-1); 2362 DEBC_printk(STp, "Default block size disabled.\n"); 2363 } else { 2364 STm->default_blksize = value; 2365 DEBC_printk(STp,"Default block size set to " 2366 "%d bytes.\n", STm->default_blksize); 2367 if (STp->ready == ST_READY) { 2368 STp->blksize_changed = 0; 2369 set_mode_densblk(STp, STm); 2370 } 2371 } 2372 } else if (code == MT_ST_TIMEOUTS) { 2373 value = (options & ~MT_ST_OPTIONS); 2374 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2375 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2376 DEBC_printk(STp, "Long timeout set to %d seconds.\n", 2377 (value & ~MT_ST_SET_LONG_TIMEOUT)); 2378 } else { 2379 blk_queue_rq_timeout(STp->device->request_queue, 2380 value * HZ); 2381 DEBC_printk(STp, "Normal timeout set to %d seconds.\n", 2382 value); 2383 } 2384 } else if (code == MT_ST_SET_CLN) { 2385 value = (options & ~MT_ST_OPTIONS) & 0xff; 2386 if (value != 0 && 2387 (value < EXTENDED_SENSE_START || 2388 value >= SCSI_SENSE_BUFFERSIZE)) 2389 return (-EINVAL); 2390 STp->cln_mode = value; 2391 STp->cln_sense_mask = (options >> 8) & 0xff; 2392 STp->cln_sense_value = (options >> 16) & 0xff; 2393 st_printk(KERN_INFO, STp, 2394 "Cleaning request mode %d, mask %02x, value %02x\n", 2395 value, STp->cln_sense_mask, STp->cln_sense_value); 2396 } else if (code == MT_ST_DEF_OPTIONS) { 2397 code = (options & ~MT_ST_CLEAR_DEFAULT); 2398 value = (options & MT_ST_CLEAR_DEFAULT); 2399 if (code == MT_ST_DEF_DENSITY) { 2400 if (value == MT_ST_CLEAR_DEFAULT) { 2401 STm->default_density = (-1); 2402 DEBC_printk(STp, 2403 "Density default disabled.\n"); 2404 } else { 2405 STm->default_density = value & 0xff; 2406 DEBC_printk(STp, "Density default set to %x\n", 2407 STm->default_density); 2408 if (STp->ready == ST_READY) { 2409 STp->density_changed = 0; 2410 set_mode_densblk(STp, STm); 2411 } 2412 } 2413 } else if (code == MT_ST_DEF_DRVBUFFER) { 2414 if (value == MT_ST_CLEAR_DEFAULT) { 2415 STp->default_drvbuffer = 0xff; 2416 DEBC_printk(STp, 2417 "Drive buffer default disabled.\n"); 2418 } else { 2419 STp->default_drvbuffer = value & 7; 2420 DEBC_printk(STp, 2421 "Drive buffer default set to %x\n", 2422 STp->default_drvbuffer); 2423 if (STp->ready == ST_READY) 2424 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2425 } 2426 } else if (code == MT_ST_DEF_COMPRESSION) { 2427 if (value == MT_ST_CLEAR_DEFAULT) { 2428 STm->default_compression = ST_DONT_TOUCH; 2429 DEBC_printk(STp, 2430 "Compression default disabled.\n"); 2431 } else { 2432 if ((value & 0xff00) != 0) { 2433 STp->c_algo = (value & 0xff00) >> 8; 2434 DEBC_printk(STp, "Compression " 2435 "algorithm set to 0x%x.\n", 2436 STp->c_algo); 2437 } 2438 if ((value & 0xff) != 0xff) { 2439 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2440 DEBC_printk(STp, "Compression default " 2441 "set to %x\n", 2442 (value & 1)); 2443 if (STp->ready == ST_READY) { 2444 STp->compression_changed = 0; 2445 st_compression(STp, (STm->default_compression == ST_YES)); 2446 } 2447 } 2448 } 2449 } 2450 } else 2451 return (-EIO); 2452 2453 return 0; 2454} 2455 2456#define MODE_HEADER_LENGTH 4 2457 2458/* Mode header and page byte offsets */ 2459#define MH_OFF_DATA_LENGTH 0 2460#define MH_OFF_MEDIUM_TYPE 1 2461#define MH_OFF_DEV_SPECIFIC 2 2462#define MH_OFF_BDESCS_LENGTH 3 2463#define MP_OFF_PAGE_NBR 0 2464#define MP_OFF_PAGE_LENGTH 1 2465 2466/* Mode header and page bit masks */ 2467#define MH_BIT_WP 0x80 2468#define MP_MSK_PAGE_NBR 0x3f 2469 2470/* Don't return block descriptors */ 2471#define MODE_SENSE_OMIT_BDESCS 0x08 2472 2473#define MODE_SELECT_PAGE_FORMAT 0x10 2474 2475/* Read a mode page into the tape buffer. The block descriptors are included 2476 if incl_block_descs is true. The page control is ored to the page number 2477 parameter, if necessary. */ 2478static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2479{ 2480 unsigned char cmd[MAX_COMMAND_SIZE]; 2481 struct st_request *SRpnt; 2482 2483 memset(cmd, 0, MAX_COMMAND_SIZE); 2484 cmd[0] = MODE_SENSE; 2485 if (omit_block_descs) 2486 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2487 cmd[2] = page; 2488 cmd[4] = 255; 2489 2490 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2491 STp->device->request_queue->rq_timeout, 0, 1); 2492 if (SRpnt == NULL) 2493 return (STp->buffer)->syscall_result; 2494 2495 st_release_request(SRpnt); 2496 2497 return STp->buffer->syscall_result; 2498} 2499 2500 2501/* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2502 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2503static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2504{ 2505 int pgo; 2506 unsigned char cmd[MAX_COMMAND_SIZE]; 2507 struct st_request *SRpnt; 2508 int timeout; 2509 2510 memset(cmd, 0, MAX_COMMAND_SIZE); 2511 cmd[0] = MODE_SELECT; 2512 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2513 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2514 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2515 2516 /* Clear reserved fields */ 2517 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2518 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2519 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2520 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2521 2522 timeout = slow ? 2523 STp->long_timeout : STp->device->request_queue->rq_timeout; 2524 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2525 timeout, 0, 1); 2526 if (SRpnt == NULL) 2527 return (STp->buffer)->syscall_result; 2528 2529 st_release_request(SRpnt); 2530 2531 return STp->buffer->syscall_result; 2532} 2533 2534 2535#define COMPRESSION_PAGE 0x0f 2536#define COMPRESSION_PAGE_LENGTH 16 2537 2538#define CP_OFF_DCE_DCC 2 2539#define CP_OFF_C_ALGO 7 2540 2541#define DCE_MASK 0x80 2542#define DCC_MASK 0x40 2543#define RED_MASK 0x60 2544 2545 2546/* Control the compression with mode page 15. Algorithm not changed if zero. 2547 2548 The block descriptors are read and written because Sony SDT-7000 does not 2549 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2550 Including block descriptors should not cause any harm to other drives. */ 2551 2552static int st_compression(struct scsi_tape * STp, int state) 2553{ 2554 int retval; 2555 int mpoffs; /* Offset to mode page start */ 2556 unsigned char *b_data = (STp->buffer)->b_data; 2557 2558 if (STp->ready != ST_READY) 2559 return (-EIO); 2560 2561 /* Read the current page contents */ 2562 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2563 if (retval) { 2564 DEBC_printk(STp, "Compression mode page not supported.\n"); 2565 return (-EIO); 2566 } 2567 2568 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2569 DEBC_printk(STp, "Compression state is %d.\n", 2570 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); 2571 2572 /* Check if compression can be changed */ 2573 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2574 DEBC_printk(STp, "Compression not supported.\n"); 2575 return (-EIO); 2576 } 2577 2578 /* Do the change */ 2579 if (state) { 2580 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2581 if (STp->c_algo != 0) 2582 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2583 } 2584 else { 2585 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2586 if (STp->c_algo != 0) 2587 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2588 } 2589 2590 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2591 if (retval) { 2592 DEBC_printk(STp, "Compression change failed.\n"); 2593 return (-EIO); 2594 } 2595 DEBC_printk(STp, "Compression state changed to %d.\n", state); 2596 2597 STp->compression_changed = 1; 2598 return 0; 2599} 2600 2601 2602/* Process the load and unload commands (does unload if the load code is zero) */ 2603static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2604{ 2605 int retval = (-EIO), timeout; 2606 unsigned char cmd[MAX_COMMAND_SIZE]; 2607 struct st_partstat *STps; 2608 struct st_request *SRpnt; 2609 2610 if (STp->ready != ST_READY && !load_code) { 2611 if (STp->ready == ST_NO_TAPE) 2612 return (-ENOMEDIUM); 2613 else 2614 return (-EIO); 2615 } 2616 2617 memset(cmd, 0, MAX_COMMAND_SIZE); 2618 cmd[0] = START_STOP; 2619 if (load_code) 2620 cmd[4] |= 1; 2621 /* 2622 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2623 */ 2624 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2625 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2626 DEBC_printk(STp, " Enhanced %sload slot %2d.\n", 2627 (cmd[4]) ? "" : "un", 2628 load_code - MT_ST_HPLOADER_OFFSET); 2629 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2630 } 2631 if (STp->immediate) { 2632 cmd[1] = 1; /* Don't wait for completion */ 2633 timeout = STp->device->request_queue->rq_timeout; 2634 } 2635 else 2636 timeout = STp->long_timeout; 2637 2638 DEBC( 2639 if (!load_code) 2640 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); 2641 else 2642 st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); 2643 ); 2644 2645 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2646 timeout, MAX_RETRIES, 1); 2647 if (!SRpnt) 2648 return (STp->buffer)->syscall_result; 2649 2650 retval = (STp->buffer)->syscall_result; 2651 st_release_request(SRpnt); 2652 2653 if (!retval) { /* SCSI command successful */ 2654 2655 if (!load_code) { 2656 STp->rew_at_close = 0; 2657 STp->ready = ST_NO_TAPE; 2658 } 2659 else { 2660 STp->rew_at_close = STp->autorew_dev; 2661 retval = check_tape(STp, filp); 2662 if (retval > 0) 2663 retval = 0; 2664 } 2665 } 2666 else { 2667 STps = &(STp->ps[STp->partition]); 2668 STps->drv_file = STps->drv_block = (-1); 2669 } 2670 2671 return retval; 2672} 2673 2674#if DEBUG 2675#define ST_DEB_FORWARD 0 2676#define ST_DEB_BACKWARD 1 2677static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) 2678{ 2679 s32 sc; 2680 2681 if (!debugging) 2682 return; 2683 2684 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23); 2685 if (direction) 2686 sc = -sc; 2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2688 direction ? "backward" : "forward", sc, units); 2689} 2690#else 2691#define ST_DEB_FORWARD 0 2692#define ST_DEB_BACKWARD 1 2693static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2694#endif 2695 2696 2697/* Internal ioctl function */ 2698static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2699{ 2700 int timeout; 2701 long ltmp; 2702 int ioctl_result; 2703 int chg_eof = 1; 2704 unsigned char cmd[MAX_COMMAND_SIZE]; 2705 struct st_request *SRpnt; 2706 struct st_partstat *STps; 2707 int fileno, blkno, at_sm, undone; 2708 int datalen = 0, direction = DMA_NONE; 2709 2710 WARN_ON(STp->buffer->do_dio != 0); 2711 if (STp->ready != ST_READY) { 2712 if (STp->ready == ST_NO_TAPE) 2713 return (-ENOMEDIUM); 2714 else 2715 return (-EIO); 2716 } 2717 timeout = STp->long_timeout; 2718 STps = &(STp->ps[STp->partition]); 2719 fileno = STps->drv_file; 2720 blkno = STps->drv_block; 2721 at_sm = STps->at_sm; 2722 2723 memset(cmd, 0, MAX_COMMAND_SIZE); 2724 switch (cmd_in) { 2725 case MTFSFM: 2726 chg_eof = 0; /* Changed from the FSF after this */ 2727 fallthrough; 2728 case MTFSF: 2729 cmd[0] = SPACE; 2730 cmd[1] = 0x01; /* Space FileMarks */ 2731 cmd[2] = (arg >> 16); 2732 cmd[3] = (arg >> 8); 2733 cmd[4] = arg; 2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2735 if (fileno >= 0) 2736 fileno += arg; 2737 blkno = 0; 2738 at_sm &= (arg == 0); 2739 break; 2740 case MTBSFM: 2741 chg_eof = 0; /* Changed from the FSF after this */ 2742 fallthrough; 2743 case MTBSF: 2744 cmd[0] = SPACE; 2745 cmd[1] = 0x01; /* Space FileMarks */ 2746 ltmp = (-arg); 2747 cmd[2] = (ltmp >> 16); 2748 cmd[3] = (ltmp >> 8); 2749 cmd[4] = ltmp; 2750 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2751 if (fileno >= 0) 2752 fileno -= arg; 2753 blkno = (-1); /* We can't know the block number */ 2754 at_sm &= (arg == 0); 2755 break; 2756 case MTFSR: 2757 cmd[0] = SPACE; 2758 cmd[1] = 0x00; /* Space Blocks */ 2759 cmd[2] = (arg >> 16); 2760 cmd[3] = (arg >> 8); 2761 cmd[4] = arg; 2762 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2763 if (blkno >= 0) 2764 blkno += arg; 2765 at_sm &= (arg == 0); 2766 break; 2767 case MTBSR: 2768 cmd[0] = SPACE; 2769 cmd[1] = 0x00; /* Space Blocks */ 2770 ltmp = (-arg); 2771 cmd[2] = (ltmp >> 16); 2772 cmd[3] = (ltmp >> 8); 2773 cmd[4] = ltmp; 2774 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2775 if (blkno >= 0) 2776 blkno -= arg; 2777 at_sm &= (arg == 0); 2778 break; 2779 case MTFSS: 2780 cmd[0] = SPACE; 2781 cmd[1] = 0x04; /* Space Setmarks */ 2782 cmd[2] = (arg >> 16); 2783 cmd[3] = (arg >> 8); 2784 cmd[4] = arg; 2785 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2786 if (arg != 0) { 2787 blkno = fileno = (-1); 2788 at_sm = 1; 2789 } 2790 break; 2791 case MTBSS: 2792 cmd[0] = SPACE; 2793 cmd[1] = 0x04; /* Space Setmarks */ 2794 ltmp = (-arg); 2795 cmd[2] = (ltmp >> 16); 2796 cmd[3] = (ltmp >> 8); 2797 cmd[4] = ltmp; 2798 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2799 if (arg != 0) { 2800 blkno = fileno = (-1); 2801 at_sm = 1; 2802 } 2803 break; 2804 case MTWEOF: 2805 case MTWEOFI: 2806 case MTWSM: 2807 if (STp->write_prot) 2808 return (-EACCES); 2809 cmd[0] = WRITE_FILEMARKS; 2810 if (cmd_in == MTWSM) 2811 cmd[1] = 2; 2812 if (cmd_in == MTWEOFI || 2813 (cmd_in == MTWEOF && STp->immediate_filemark)) 2814 cmd[1] |= 1; 2815 cmd[2] = (arg >> 16); 2816 cmd[3] = (arg >> 8); 2817 cmd[4] = arg; 2818 timeout = STp->device->request_queue->rq_timeout; 2819 DEBC( 2820 if (cmd_in != MTWSM) 2821 st_printk(ST_DEB_MSG, STp, 2822 "Writing %d filemarks.\n", 2823 cmd[2] * 65536 + 2824 cmd[3] * 256 + 2825 cmd[4]); 2826 else 2827 st_printk(ST_DEB_MSG, STp, 2828 "Writing %d setmarks.\n", 2829 cmd[2] * 65536 + 2830 cmd[3] * 256 + 2831 cmd[4]); 2832 ) 2833 if (fileno >= 0) 2834 fileno += arg; 2835 blkno = 0; 2836 at_sm = (cmd_in == MTWSM); 2837 break; 2838 case MTREW: 2839 cmd[0] = REZERO_UNIT; 2840 if (STp->immediate) { 2841 cmd[1] = 1; /* Don't wait for completion */ 2842 timeout = STp->device->request_queue->rq_timeout; 2843 } 2844 DEBC_printk(STp, "Rewinding tape.\n"); 2845 fileno = blkno = at_sm = 0; 2846 break; 2847 case MTNOP: 2848 DEBC_printk(STp, "No op on tape.\n"); 2849 return 0; /* Should do something ? */ 2850 case MTRETEN: 2851 cmd[0] = START_STOP; 2852 if (STp->immediate) { 2853 cmd[1] = 1; /* Don't wait for completion */ 2854 timeout = STp->device->request_queue->rq_timeout; 2855 } 2856 cmd[4] = 3; 2857 DEBC_printk(STp, "Retensioning tape.\n"); 2858 fileno = blkno = at_sm = 0; 2859 break; 2860 case MTEOM: 2861 if (!STp->fast_mteom) { 2862 /* space to the end of tape */ 2863 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2864 fileno = STps->drv_file; 2865 if (STps->eof >= ST_EOD_1) 2866 return 0; 2867 /* The next lines would hide the number of spaced FileMarks 2868 That's why I inserted the previous lines. I had no luck 2869 with detecting EOM with FSF, so we go now to EOM. 2870 Joerg Weule */ 2871 } else 2872 fileno = (-1); 2873 cmd[0] = SPACE; 2874 cmd[1] = 3; 2875 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2876 blkno = -1; 2877 at_sm = 0; 2878 break; 2879 case MTERASE: 2880 if (STp->write_prot) 2881 return (-EACCES); 2882 cmd[0] = ERASE; 2883 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2884 if (STp->immediate) { 2885 cmd[1] |= 2; /* Don't wait for completion */ 2886 timeout = STp->device->request_queue->rq_timeout; 2887 } 2888 else 2889 timeout = STp->long_timeout * 8; 2890 2891 DEBC_printk(STp, "Erasing tape.\n"); 2892 fileno = blkno = at_sm = 0; 2893 break; 2894 case MTSETBLK: /* Set block length */ 2895 case MTSETDENSITY: /* Set tape density */ 2896 case MTSETDRVBUFFER: /* Set drive buffering */ 2897 case SET_DENS_AND_BLK: /* Set density and block size */ 2898 chg_eof = 0; 2899 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2900 return (-EIO); /* Not allowed if data in buffer */ 2901 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2902 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2903 STp->max_block > 0 && 2904 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2905 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2906 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2907 return (-EINVAL); 2908 } 2909 cmd[0] = MODE_SELECT; 2910 if ((STp->use_pf & USE_PF)) 2911 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2912 cmd[4] = datalen = 12; 2913 direction = DMA_TO_DEVICE; 2914 2915 memset((STp->buffer)->b_data, 0, 12); 2916 if (cmd_in == MTSETDRVBUFFER) 2917 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2918 else 2919 (STp->buffer)->b_data[2] = 2920 STp->drv_buffer << 4; 2921 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2922 if (cmd_in == MTSETDENSITY) { 2923 (STp->buffer)->b_data[4] = arg; 2924 STp->density_changed = 1; /* At least we tried ;-) */ 2925 } else if (cmd_in == SET_DENS_AND_BLK) 2926 (STp->buffer)->b_data[4] = arg >> 24; 2927 else 2928 (STp->buffer)->b_data[4] = STp->density; 2929 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2930 ltmp = arg & MT_ST_BLKSIZE_MASK; 2931 if (cmd_in == MTSETBLK) 2932 STp->blksize_changed = 1; /* At least we tried ;-) */ 2933 } else 2934 ltmp = STp->block_size; 2935 (STp->buffer)->b_data[9] = (ltmp >> 16); 2936 (STp->buffer)->b_data[10] = (ltmp >> 8); 2937 (STp->buffer)->b_data[11] = ltmp; 2938 timeout = STp->device->request_queue->rq_timeout; 2939 DEBC( 2940 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2941 st_printk(ST_DEB_MSG, STp, 2942 "Setting block size to %d bytes.\n", 2943 (STp->buffer)->b_data[9] * 65536 + 2944 (STp->buffer)->b_data[10] * 256 + 2945 (STp->buffer)->b_data[11]); 2946 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2947 st_printk(ST_DEB_MSG, STp, 2948 "Setting density code to %x.\n", 2949 (STp->buffer)->b_data[4]); 2950 if (cmd_in == MTSETDRVBUFFER) 2951 st_printk(ST_DEB_MSG, STp, 2952 "Setting drive buffer code to %d.\n", 2953 ((STp->buffer)->b_data[2] >> 4) & 7); 2954 ) 2955 break; 2956 default: 2957 return (-ENOSYS); 2958 } 2959 2960 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2961 timeout, MAX_RETRIES, 1); 2962 if (!SRpnt) 2963 return (STp->buffer)->syscall_result; 2964 2965 ioctl_result = (STp->buffer)->syscall_result; 2966 2967 if (!ioctl_result) { /* SCSI command successful */ 2968 st_release_request(SRpnt); 2969 SRpnt = NULL; 2970 STps->drv_block = blkno; 2971 STps->drv_file = fileno; 2972 STps->at_sm = at_sm; 2973 2974 if (cmd_in == MTBSFM) 2975 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2976 else if (cmd_in == MTFSFM) 2977 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2978 2979 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2980 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2981 if (STp->block_size != 0) { 2982 (STp->buffer)->buffer_blocks = 2983 (STp->buffer)->buffer_size / STp->block_size; 2984 } 2985 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2986 if (cmd_in == SET_DENS_AND_BLK) 2987 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2988 } else if (cmd_in == MTSETDRVBUFFER) 2989 STp->drv_buffer = (arg & 7); 2990 else if (cmd_in == MTSETDENSITY) 2991 STp->density = arg; 2992 2993 if (cmd_in == MTEOM) 2994 STps->eof = ST_EOD; 2995 else if (cmd_in == MTFSF) 2996 STps->eof = ST_FM; 2997 else if (chg_eof) 2998 STps->eof = ST_NOEOF; 2999 3000 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3001 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3002 } else { /* SCSI command was not completely successful. Don't return 3003 from this block without releasing the SCSI command block! */ 3004 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3005 3006 if (cmdstatp->flags & SENSE_EOM) { 3007 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3008 cmd_in != MTBSR && cmd_in != MTBSS) 3009 STps->eof = ST_EOM_OK; 3010 STps->drv_block = 0; 3011 } 3012 3013 if (cmdstatp->remainder_valid) 3014 undone = (int)cmdstatp->uremainder64; 3015 else 3016 undone = 0; 3017 3018 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3019 cmdstatp->have_sense && 3020 (cmdstatp->flags & SENSE_EOM)) { 3021 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3022 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3023 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3024 STps->eof = ST_NOEOF; 3025 } else { /* Writing EOF(s) failed */ 3026 if (fileno >= 0) 3027 fileno -= undone; 3028 if (undone < arg) 3029 STps->eof = ST_NOEOF; 3030 } 3031 STps->drv_file = fileno; 3032 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3033 if (fileno >= 0) 3034 STps->drv_file = fileno - undone; 3035 else 3036 STps->drv_file = fileno; 3037 STps->drv_block = -1; 3038 STps->eof = ST_NOEOF; 3039 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3040 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3041 undone = (-undone); 3042 if (STps->drv_file >= 0) 3043 STps->drv_file = fileno + undone; 3044 STps->drv_block = 0; 3045 STps->eof = ST_NOEOF; 3046 } else if (cmd_in == MTFSR) { 3047 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3048 if (STps->drv_file >= 0) 3049 STps->drv_file++; 3050 STps->drv_block = 0; 3051 STps->eof = ST_FM; 3052 } else { 3053 if (blkno >= undone) 3054 STps->drv_block = blkno - undone; 3055 else 3056 STps->drv_block = (-1); 3057 STps->eof = ST_NOEOF; 3058 } 3059 } else if (cmd_in == MTBSR) { 3060 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3061 STps->drv_file--; 3062 STps->drv_block = (-1); 3063 } else { 3064 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3065 undone = (-undone); 3066 if (STps->drv_block >= 0) 3067 STps->drv_block = blkno + undone; 3068 } 3069 STps->eof = ST_NOEOF; 3070 } else if (cmd_in == MTEOM) { 3071 STps->drv_file = (-1); 3072 STps->drv_block = (-1); 3073 STps->eof = ST_EOD; 3074 } else if (cmd_in == MTSETBLK || 3075 cmd_in == MTSETDENSITY || 3076 cmd_in == MTSETDRVBUFFER || 3077 cmd_in == SET_DENS_AND_BLK) { 3078 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3079 !(STp->use_pf & PF_TESTED)) { 3080 /* Try the other possible state of Page Format if not 3081 already tried */ 3082 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3083 st_release_request(SRpnt); 3084 SRpnt = NULL; 3085 return st_int_ioctl(STp, cmd_in, arg); 3086 } 3087 } else if (chg_eof) 3088 STps->eof = ST_NOEOF; 3089 3090 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3091 STps->eof = ST_EOD; 3092 3093 st_release_request(SRpnt); 3094 SRpnt = NULL; 3095 } 3096 3097 return ioctl_result; 3098} 3099 3100 3101/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3102 structure. */ 3103 3104static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3105 int logical) 3106{ 3107 int result; 3108 unsigned char scmd[MAX_COMMAND_SIZE]; 3109 struct st_request *SRpnt; 3110 3111 if (STp->ready != ST_READY) 3112 return (-EIO); 3113 3114 memset(scmd, 0, MAX_COMMAND_SIZE); 3115 if ((STp->device)->scsi_level < SCSI_2) { 3116 scmd[0] = QFA_REQUEST_BLOCK; 3117 scmd[4] = 3; 3118 } else { 3119 scmd[0] = READ_POSITION; 3120 if (!logical && !STp->scsi2_logical) 3121 scmd[1] = 1; 3122 } 3123 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3124 STp->device->request_queue->rq_timeout, 3125 MAX_READY_RETRIES, 1); 3126 if (!SRpnt) 3127 return (STp->buffer)->syscall_result; 3128 3129 if ((STp->buffer)->syscall_result != 0 || 3130 (STp->device->scsi_level >= SCSI_2 && 3131 ((STp->buffer)->b_data[0] & 4) != 0)) { 3132 *block = *partition = 0; 3133 DEBC_printk(STp, " Can't read tape position.\n"); 3134 result = (-EIO); 3135 } else { 3136 result = 0; 3137 if ((STp->device)->scsi_level < SCSI_2) { 3138 *block = ((STp->buffer)->b_data[0] << 16) 3139 + ((STp->buffer)->b_data[1] << 8) 3140 + (STp->buffer)->b_data[2]; 3141 *partition = 0; 3142 } else { 3143 *block = ((STp->buffer)->b_data[4] << 24) 3144 + ((STp->buffer)->b_data[5] << 16) 3145 + ((STp->buffer)->b_data[6] << 8) 3146 + (STp->buffer)->b_data[7]; 3147 *partition = (STp->buffer)->b_data[1]; 3148 if (((STp->buffer)->b_data[0] & 0x80) && 3149 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3150 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3151 } 3152 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3153 *block, *partition); 3154 } 3155 st_release_request(SRpnt); 3156 SRpnt = NULL; 3157 3158 return result; 3159} 3160 3161 3162/* Set the tape block and partition. Negative partition means that only the 3163 block should be set in vendor specific way. */ 3164static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3165 int logical) 3166{ 3167 struct st_partstat *STps; 3168 int result, p; 3169 unsigned int blk; 3170 int timeout; 3171 unsigned char scmd[MAX_COMMAND_SIZE]; 3172 struct st_request *SRpnt; 3173 3174 if (STp->ready != ST_READY) 3175 return (-EIO); 3176 timeout = STp->long_timeout; 3177 STps = &(STp->ps[STp->partition]); 3178 3179 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3180 block, partition); 3181 DEB(if (partition < 0) 3182 return (-EIO); ) 3183 3184 /* Update the location at the partition we are leaving */ 3185 if ((!STp->can_partitions && partition != 0) || 3186 partition >= ST_NBR_PARTITIONS) 3187 return (-EINVAL); 3188 if (partition != STp->partition) { 3189 if (get_location(STp, &blk, &p, 1)) 3190 STps->last_block_valid = 0; 3191 else { 3192 STps->last_block_valid = 1; 3193 STps->last_block_visited = blk; 3194 DEBC_printk(STp, "Visited block %d for " 3195 "partition %d saved.\n", 3196 blk, STp->partition); 3197 } 3198 } 3199 3200 memset(scmd, 0, MAX_COMMAND_SIZE); 3201 if ((STp->device)->scsi_level < SCSI_2) { 3202 scmd[0] = QFA_SEEK_BLOCK; 3203 scmd[2] = (block >> 16); 3204 scmd[3] = (block >> 8); 3205 scmd[4] = block; 3206 scmd[5] = 0; 3207 } else { 3208 scmd[0] = SEEK_10; 3209 scmd[3] = (block >> 24); 3210 scmd[4] = (block >> 16); 3211 scmd[5] = (block >> 8); 3212 scmd[6] = block; 3213 if (!logical && !STp->scsi2_logical) 3214 scmd[1] = 4; 3215 if (STp->partition != partition) { 3216 scmd[1] |= 2; 3217 scmd[8] = partition; 3218 DEBC_printk(STp, "Trying to change partition " 3219 "from %d to %d\n", STp->partition, 3220 partition); 3221 } 3222 } 3223 if (STp->immediate) { 3224 scmd[1] |= 1; /* Don't wait for completion */ 3225 timeout = STp->device->request_queue->rq_timeout; 3226 } 3227 3228 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3229 timeout, MAX_READY_RETRIES, 1); 3230 if (!SRpnt) 3231 return (STp->buffer)->syscall_result; 3232 3233 STps->drv_block = STps->drv_file = (-1); 3234 STps->eof = ST_NOEOF; 3235 if ((STp->buffer)->syscall_result != 0) { 3236 result = (-EIO); 3237 if (STp->can_partitions && 3238 (STp->device)->scsi_level >= SCSI_2 && 3239 (p = find_partition(STp)) >= 0) 3240 STp->partition = p; 3241 } else { 3242 if (STp->can_partitions) { 3243 STp->partition = partition; 3244 STps = &(STp->ps[partition]); 3245 if (!STps->last_block_valid || 3246 STps->last_block_visited != block) { 3247 STps->at_sm = 0; 3248 STps->rw = ST_IDLE; 3249 } 3250 } else 3251 STps->at_sm = 0; 3252 if (block == 0) 3253 STps->drv_block = STps->drv_file = 0; 3254 result = 0; 3255 } 3256 3257 st_release_request(SRpnt); 3258 SRpnt = NULL; 3259 3260 return result; 3261} 3262 3263 3264/* Find the current partition number for the drive status. Called from open and 3265 returns either partition number of negative error code. */ 3266static int find_partition(struct scsi_tape *STp) 3267{ 3268 int i, partition; 3269 unsigned int block; 3270 3271 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3272 return i; 3273 if (partition >= ST_NBR_PARTITIONS) 3274 return (-EIO); 3275 return partition; 3276} 3277 3278 3279/* Change the partition if necessary */ 3280static int switch_partition(struct scsi_tape *STp) 3281{ 3282 struct st_partstat *STps; 3283 3284 if (STp->partition == STp->new_partition) 3285 return 0; 3286 STps = &(STp->ps[STp->new_partition]); 3287 if (!STps->last_block_valid) 3288 STps->last_block_visited = 0; 3289 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3290} 3291 3292/* Functions for reading and writing the medium partition mode page. */ 3293 3294#define PART_PAGE 0x11 3295#define PART_PAGE_FIXED_LENGTH 8 3296 3297#define PP_OFF_MAX_ADD_PARTS 2 3298#define PP_OFF_NBR_ADD_PARTS 3 3299#define PP_OFF_FLAGS 4 3300#define PP_OFF_PART_UNITS 6 3301#define PP_OFF_RESERVED 7 3302 3303#define PP_BIT_IDP 0x20 3304#define PP_BIT_FDP 0x80 3305#define PP_MSK_PSUM_MB 0x10 3306#define PP_MSK_PSUM_UNITS 0x18 3307#define PP_MSK_POFM 0x04 3308 3309/* Get the number of partitions on the tape. As a side effect reads the 3310 mode page into the tape buffer. */ 3311static int nbr_partitions(struct scsi_tape *STp) 3312{ 3313 int result; 3314 3315 if (STp->ready != ST_READY) 3316 return (-EIO); 3317 3318 result = read_mode_page(STp, PART_PAGE, 1); 3319 3320 if (result) { 3321 DEBC_printk(STp, "Can't read medium partition page.\n"); 3322 result = (-EIO); 3323 } else { 3324 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3325 PP_OFF_NBR_ADD_PARTS] + 1; 3326 DEBC_printk(STp, "Number of partitions %d.\n", result); 3327 } 3328 3329 return result; 3330} 3331 3332 3333static int format_medium(struct scsi_tape *STp, int format) 3334{ 3335 int result = 0; 3336 int timeout = STp->long_timeout; 3337 unsigned char scmd[MAX_COMMAND_SIZE]; 3338 struct st_request *SRpnt; 3339 3340 memset(scmd, 0, MAX_COMMAND_SIZE); 3341 scmd[0] = FORMAT_UNIT; 3342 scmd[2] = format; 3343 if (STp->immediate) { 3344 scmd[1] |= 1; /* Don't wait for completion */ 3345 timeout = STp->device->request_queue->rq_timeout; 3346 } 3347 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3348 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3349 timeout, MAX_RETRIES, 1); 3350 if (!SRpnt) 3351 result = STp->buffer->syscall_result; 3352 return result; 3353} 3354 3355 3356/* Partition the tape into two partitions if size > 0 or one partition if 3357 size == 0. 3358 3359 The block descriptors are read and written because Sony SDT-7000 does not 3360 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3361 3362 My HP C1533A drive returns only one partition size field. This is used to 3363 set the size of partition 1. There is no size field for the default partition. 3364 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3365 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3366 The following algorithm is used to accommodate both drives: if the number of 3367 partition size fields is greater than the maximum number of additional partitions 3368 in the mode page, the second field is used. Otherwise the first field is used. 3369 3370 For Seagate DDS drives the page length must be 8 when no partitions is defined 3371 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3372 is acceptable also to some other old drives and enforced if the first partition 3373 size field is used for the first additional partition size. 3374 3375 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3376 */ 3377static int partition_tape(struct scsi_tape *STp, int size) 3378{ 3379 int result; 3380 int target_partition; 3381 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3382 int pgo, psd_cnt, psdo; 3383 int psum = PP_MSK_PSUM_MB, units = 0; 3384 unsigned char *bp; 3385 3386 result = read_mode_page(STp, PART_PAGE, 0); 3387 if (result) { 3388 DEBC_printk(STp, "Can't read partition mode page.\n"); 3389 return result; 3390 } 3391 target_partition = 1; 3392 if (size < 0) { 3393 target_partition = 0; 3394 size = -size; 3395 } 3396 3397 /* The mode page is in the buffer. Let's modify it and write it. */ 3398 bp = (STp->buffer)->b_data; 3399 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3400 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3401 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3402 3403 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3404 3405 if (scsi3) { 3406 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3407 if (needs_format && size == 0) { 3408 /* No need to write the mode page when clearing 3409 * partitioning 3410 */ 3411 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3412 result = format_medium(STp, 0); 3413 goto out; 3414 } 3415 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3416 psd_cnt = 2; 3417 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3418 /* Use units scaling for large partitions if the device 3419 * suggests it and no precision lost. Required for IBM 3420 * TS1140/50 drives that don't support MB units. 3421 */ 3422 if (size >= 1000 && (size % 1000) == 0) { 3423 size /= 1000; 3424 psum = PP_MSK_PSUM_UNITS; 3425 units = 9; /* GB */ 3426 } 3427 } 3428 /* Try it anyway if too large to specify in MB */ 3429 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3430 size /= 1000; 3431 psum = PP_MSK_PSUM_UNITS; 3432 units = 9; /* GB */ 3433 } 3434 } 3435 3436 if (size >= 65535 || /* Does not fit into two bytes */ 3437 (target_partition == 0 && psd_cnt < 2)) { 3438 result = -EINVAL; 3439 goto out; 3440 } 3441 3442 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3443 /* The second condition is for HP DDS which use only one partition size 3444 * descriptor 3445 */ 3446 if (target_partition > 0 && 3447 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3448 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3449 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3450 psdo += 2; 3451 } 3452 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3453 3454 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3455 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3456 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3457 3458 if (size == 0) { 3459 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3460 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3461 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3462 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3463 } else { 3464 bp[psdo] = (size >> 8) & 0xff; 3465 bp[psdo + 1] = size & 0xff; 3466 if (target_partition == 0) 3467 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3468 bp[pgo + 3] = 1; 3469 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3470 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3471 DEBC_printk(STp, 3472 "Formatting tape with two partitions (%i = %d MB).\n", 3473 target_partition, units > 0 ? size * 1000 : size); 3474 } 3475 bp[pgo + PP_OFF_PART_UNITS] = 0; 3476 bp[pgo + PP_OFF_RESERVED] = 0; 3477 if (size != 1 || units != 0) { 3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3479 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3480 bp[pgo + PP_OFF_PART_UNITS] = units; 3481 } else 3482 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3483 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3484 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3485 3486 result = write_mode_page(STp, PART_PAGE, 1); 3487 3488 if (!result && needs_format) 3489 result = format_medium(STp, 1); 3490 3491 if (result) { 3492 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3493 result = (-EIO); 3494 } 3495 3496out: 3497 return result; 3498} 3499 3500 3501 3502/* The ioctl command */ 3503static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3504{ 3505 void __user *p = (void __user *)arg; 3506 int i, cmd_nr, cmd_type, bt; 3507 int retval = 0; 3508 unsigned int blk; 3509 struct scsi_tape *STp = file->private_data; 3510 struct st_modedef *STm; 3511 struct st_partstat *STps; 3512 3513 if (mutex_lock_interruptible(&STp->lock)) 3514 return -ERESTARTSYS; 3515 3516 DEB( 3517 if (debugging && !STp->in_use) { 3518 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3519 retval = (-EIO); 3520 goto out; 3521 } ) /* end DEB */ 3522 3523 STm = &(STp->modes[STp->current_mode]); 3524 STps = &(STp->ps[STp->partition]); 3525 3526 /* 3527 * If we are in the middle of error recovery, don't let anyone 3528 * else try and use this device. Also, if error recovery fails, it 3529 * may try and take the device offline, in which case all further 3530 * access to the device is prohibited. 3531 */ 3532 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3533 file->f_flags & O_NDELAY); 3534 if (retval) 3535 goto out; 3536 3537 cmd_type = _IOC_TYPE(cmd_in); 3538 cmd_nr = _IOC_NR(cmd_in); 3539 3540 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3541 struct mtop mtc; 3542 3543 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3544 retval = (-EINVAL); 3545 goto out; 3546 } 3547 3548 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3549 if (i) { 3550 retval = (-EFAULT); 3551 goto out; 3552 } 3553 3554 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3555 st_printk(KERN_WARNING, STp, 3556 "MTSETDRVBUFFER only allowed for root.\n"); 3557 retval = (-EPERM); 3558 goto out; 3559 } 3560 if (!STm->defined && 3561 (mtc.mt_op != MTSETDRVBUFFER && 3562 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3563 retval = (-ENXIO); 3564 goto out; 3565 } 3566 3567 if (!STp->pos_unknown) { 3568 3569 if (STps->eof == ST_FM_HIT) { 3570 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3571 mtc.mt_op == MTEOM) { 3572 mtc.mt_count -= 1; 3573 if (STps->drv_file >= 0) 3574 STps->drv_file += 1; 3575 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3576 mtc.mt_count += 1; 3577 if (STps->drv_file >= 0) 3578 STps->drv_file += 1; 3579 } 3580 } 3581 3582 if (mtc.mt_op == MTSEEK) { 3583 /* Old position must be restored if partition will be 3584 changed */ 3585 i = !STp->can_partitions || 3586 (STp->new_partition != STp->partition); 3587 } else { 3588 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3589 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3590 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3591 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3592 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3593 mtc.mt_op == MTCOMPRESSION; 3594 } 3595 i = flush_buffer(STp, i); 3596 if (i < 0) { 3597 retval = i; 3598 goto out; 3599 } 3600 if (STps->rw == ST_WRITING && 3601 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3602 mtc.mt_op == MTSEEK || 3603 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3604 i = st_int_ioctl(STp, MTWEOF, 1); 3605 if (i < 0) { 3606 retval = i; 3607 goto out; 3608 } 3609 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3610 mtc.mt_count++; 3611 STps->rw = ST_IDLE; 3612 } 3613 3614 } else { 3615 /* 3616 * If there was a bus reset, block further access 3617 * to this device. If the user wants to rewind the tape, 3618 * then reset the flag and allow access again. 3619 */ 3620 if (mtc.mt_op != MTREW && 3621 mtc.mt_op != MTOFFL && 3622 mtc.mt_op != MTRETEN && 3623 mtc.mt_op != MTERASE && 3624 mtc.mt_op != MTSEEK && 3625 mtc.mt_op != MTEOM) { 3626 retval = (-EIO); 3627 goto out; 3628 } 3629 reset_state(STp); 3630 /* remove this when the midlevel properly clears was_reset */ 3631 STp->device->was_reset = 0; 3632 } 3633 3634 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3635 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3636 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3637 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3638 3639 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3640 do_door_lock(STp, 0); /* Ignore result! */ 3641 3642 if (mtc.mt_op == MTSETDRVBUFFER && 3643 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3644 retval = st_set_options(STp, mtc.mt_count); 3645 goto out; 3646 } 3647 3648 if (mtc.mt_op == MTSETPART) { 3649 if (!STp->can_partitions || 3650 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3651 retval = (-EINVAL); 3652 goto out; 3653 } 3654 if (mtc.mt_count >= STp->nbr_partitions && 3655 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3656 retval = (-EIO); 3657 goto out; 3658 } 3659 if (mtc.mt_count >= STp->nbr_partitions) { 3660 retval = (-EINVAL); 3661 goto out; 3662 } 3663 STp->new_partition = mtc.mt_count; 3664 retval = 0; 3665 goto out; 3666 } 3667 3668 if (mtc.mt_op == MTMKPART) { 3669 if (!STp->can_partitions) { 3670 retval = (-EINVAL); 3671 goto out; 3672 } 3673 i = do_load_unload(STp, file, 1); 3674 if (i < 0) { 3675 retval = i; 3676 goto out; 3677 } 3678 i = partition_tape(STp, mtc.mt_count); 3679 if (i < 0) { 3680 retval = i; 3681 goto out; 3682 } 3683 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3684 STp->ps[i].rw = ST_IDLE; 3685 STp->ps[i].at_sm = 0; 3686 STp->ps[i].last_block_valid = 0; 3687 } 3688 STp->partition = STp->new_partition = 0; 3689 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3690 STps->drv_block = STps->drv_file = 0; 3691 retval = 0; 3692 goto out; 3693 } 3694 3695 if (mtc.mt_op == MTSEEK) { 3696 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3697 if (!STp->can_partitions) 3698 STp->ps[0].rw = ST_IDLE; 3699 retval = i; 3700 goto out; 3701 } 3702 3703 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3704 retval = do_load_unload(STp, file, 0); 3705 goto out; 3706 } 3707 3708 if (mtc.mt_op == MTLOAD) { 3709 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3710 goto out; 3711 } 3712 3713 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3714 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3715 goto out; 3716 } 3717 3718 if (STp->can_partitions && STp->ready == ST_READY && 3719 (i = switch_partition(STp)) < 0) { 3720 retval = i; 3721 goto out; 3722 } 3723 3724 if (mtc.mt_op == MTCOMPRESSION) 3725 retval = st_compression(STp, (mtc.mt_count & 1)); 3726 else 3727 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3728 goto out; 3729 } 3730 if (!STm->defined) { 3731 retval = (-ENXIO); 3732 goto out; 3733 } 3734 3735 if ((i = flush_buffer(STp, 0)) < 0) { 3736 retval = i; 3737 goto out; 3738 } 3739 if (STp->can_partitions && 3740 (i = switch_partition(STp)) < 0) { 3741 retval = i; 3742 goto out; 3743 } 3744 3745 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3746 struct mtget mt_status; 3747 3748 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3749 retval = (-EINVAL); 3750 goto out; 3751 } 3752 3753 mt_status.mt_type = STp->tape_type; 3754 mt_status.mt_dsreg = 3755 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3756 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3757 mt_status.mt_blkno = STps->drv_block; 3758 mt_status.mt_fileno = STps->drv_file; 3759 if (STp->block_size != 0) { 3760 if (STps->rw == ST_WRITING) 3761 mt_status.mt_blkno += 3762 (STp->buffer)->buffer_bytes / STp->block_size; 3763 else if (STps->rw == ST_READING) 3764 mt_status.mt_blkno -= 3765 ((STp->buffer)->buffer_bytes + 3766 STp->block_size - 1) / STp->block_size; 3767 } 3768 3769 mt_status.mt_gstat = 0; 3770 if (STp->drv_write_prot) 3771 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3772 if (mt_status.mt_blkno == 0) { 3773 if (mt_status.mt_fileno == 0) 3774 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3775 else 3776 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3777 } 3778 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3779 mt_status.mt_resid = STp->partition; 3780 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3781 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3782 else if (STps->eof >= ST_EOM_OK) 3783 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3784 if (STp->density == 1) 3785 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3786 else if (STp->density == 2) 3787 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3788 else if (STp->density == 3) 3789 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3790 if (STp->ready == ST_READY) 3791 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3792 if (STp->ready == ST_NO_TAPE) 3793 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3794 if (STps->at_sm) 3795 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3796 if (STm->do_async_writes || 3797 (STm->do_buffer_writes && STp->block_size != 0) || 3798 STp->drv_buffer != 0) 3799 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3800 if (STp->cleaning_req) 3801 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3802 3803 retval = put_user_mtget(p, &mt_status); 3804 if (retval) 3805 goto out; 3806 3807 STp->recover_reg = 0; /* Clear after read */ 3808 goto out; 3809 } /* End of MTIOCGET */ 3810 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3811 struct mtpos mt_pos; 3812 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3813 retval = (-EINVAL); 3814 goto out; 3815 } 3816 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3817 retval = i; 3818 goto out; 3819 } 3820 mt_pos.mt_blkno = blk; 3821 retval = put_user_mtpos(p, &mt_pos); 3822 goto out; 3823 } 3824 mutex_unlock(&STp->lock); 3825 3826 switch (cmd_in) { 3827 case SG_IO: 3828 case SCSI_IOCTL_SEND_COMMAND: 3829 case CDROM_SEND_PACKET: 3830 if (!capable(CAP_SYS_RAWIO)) 3831 return -EPERM; 3832 break; 3833 default: 3834 break; 3835 } 3836 3837 retval = scsi_ioctl(STp->device, file->f_mode & FMODE_WRITE, cmd_in, p); 3838 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { 3839 /* unload */ 3840 STp->rew_at_close = 0; 3841 STp->ready = ST_NO_TAPE; 3842 } 3843 return retval; 3844 3845 out: 3846 mutex_unlock(&STp->lock); 3847 return retval; 3848} 3849 3850#ifdef CONFIG_COMPAT 3851static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3852{ 3853 /* argument conversion is handled using put_user_mtpos/put_user_mtget */ 3854 switch (cmd_in) { 3855 case MTIOCPOS32: 3856 cmd_in = MTIOCPOS; 3857 break; 3858 case MTIOCGET32: 3859 cmd_in = MTIOCGET; 3860 break; 3861 } 3862 3863 return st_ioctl(file, cmd_in, arg); 3864} 3865#endif 3866 3867 3868 3869/* Try to allocate a new tape buffer. Calling function must not hold 3870 dev_arr_lock. */ 3871static struct st_buffer *new_tape_buffer(int max_sg) 3872{ 3873 struct st_buffer *tb; 3874 3875 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3876 if (!tb) { 3877 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3878 return NULL; 3879 } 3880 tb->frp_segs = 0; 3881 tb->use_sg = max_sg; 3882 tb->buffer_size = 0; 3883 3884 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3885 GFP_KERNEL); 3886 if (!tb->reserved_pages) { 3887 kfree(tb); 3888 return NULL; 3889 } 3890 3891 return tb; 3892} 3893 3894 3895/* Try to allocate enough space in the tape buffer */ 3896#define ST_MAX_ORDER 6 3897 3898static int enlarge_buffer(struct st_buffer * STbuffer, int new_size) 3899{ 3900 int segs, max_segs, b_size, order, got; 3901 gfp_t priority; 3902 3903 if (new_size <= STbuffer->buffer_size) 3904 return 1; 3905 3906 if (STbuffer->buffer_size <= PAGE_SIZE) 3907 normalize_buffer(STbuffer); /* Avoid extra segment */ 3908 3909 max_segs = STbuffer->use_sg; 3910 3911 priority = GFP_KERNEL | __GFP_NOWARN; 3912 3913 if (STbuffer->cleared) 3914 priority |= __GFP_ZERO; 3915 3916 if (STbuffer->frp_segs) { 3917 order = STbuffer->reserved_page_order; 3918 b_size = PAGE_SIZE << order; 3919 } else { 3920 for (b_size = PAGE_SIZE, order = 0; 3921 order < ST_MAX_ORDER && 3922 max_segs * (PAGE_SIZE << order) < new_size; 3923 order++, b_size *= 2) 3924 ; /* empty */ 3925 STbuffer->reserved_page_order = order; 3926 } 3927 if (max_segs * (PAGE_SIZE << order) < new_size) { 3928 if (order == ST_MAX_ORDER) 3929 return 0; 3930 normalize_buffer(STbuffer); 3931 return enlarge_buffer(STbuffer, new_size); 3932 } 3933 3934 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3935 segs < max_segs && got < new_size;) { 3936 struct page *page; 3937 3938 page = alloc_pages(priority, order); 3939 if (!page) { 3940 DEB(STbuffer->buffer_size = got); 3941 normalize_buffer(STbuffer); 3942 return 0; 3943 } 3944 3945 STbuffer->frp_segs += 1; 3946 got += b_size; 3947 STbuffer->buffer_size = got; 3948 STbuffer->reserved_pages[segs] = page; 3949 segs++; 3950 } 3951 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3952 3953 return 1; 3954} 3955 3956 3957/* Make sure that no data from previous user is in the internal buffer */ 3958static void clear_buffer(struct st_buffer * st_bp) 3959{ 3960 int i; 3961 3962 for (i=0; i < st_bp->frp_segs; i++) 3963 memset(page_address(st_bp->reserved_pages[i]), 0, 3964 PAGE_SIZE << st_bp->reserved_page_order); 3965 st_bp->cleared = 1; 3966} 3967 3968 3969/* Release the extra buffer */ 3970static void normalize_buffer(struct st_buffer * STbuffer) 3971{ 3972 int i, order = STbuffer->reserved_page_order; 3973 3974 for (i = 0; i < STbuffer->frp_segs; i++) { 3975 __free_pages(STbuffer->reserved_pages[i], order); 3976 STbuffer->buffer_size -= (PAGE_SIZE << order); 3977 } 3978 STbuffer->frp_segs = 0; 3979 STbuffer->sg_segs = 0; 3980 STbuffer->reserved_page_order = 0; 3981 STbuffer->map_data.offset = 0; 3982} 3983 3984 3985/* Move data from the user buffer to the tape buffer. Returns zero (success) or 3986 negative error code. */ 3987static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3988{ 3989 int i, cnt, res, offset; 3990 int length = PAGE_SIZE << st_bp->reserved_page_order; 3991 3992 for (i = 0, offset = st_bp->buffer_bytes; 3993 i < st_bp->frp_segs && offset >= length; i++) 3994 offset -= length; 3995 if (i == st_bp->frp_segs) { /* Should never happen */ 3996 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 3997 return (-EIO); 3998 } 3999 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4000 struct page *page = st_bp->reserved_pages[i]; 4001 cnt = length - offset < do_count ? length - offset : do_count; 4002 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4003 if (res) 4004 return (-EFAULT); 4005 do_count -= cnt; 4006 st_bp->buffer_bytes += cnt; 4007 ubp += cnt; 4008 offset = 0; 4009 } 4010 if (do_count) /* Should never happen */ 4011 return (-EIO); 4012 4013 return 0; 4014} 4015 4016 4017/* Move data from the tape buffer to the user buffer. Returns zero (success) or 4018 negative error code. */ 4019static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4020{ 4021 int i, cnt, res, offset; 4022 int length = PAGE_SIZE << st_bp->reserved_page_order; 4023 4024 for (i = 0, offset = st_bp->read_pointer; 4025 i < st_bp->frp_segs && offset >= length; i++) 4026 offset -= length; 4027 if (i == st_bp->frp_segs) { /* Should never happen */ 4028 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4029 return (-EIO); 4030 } 4031 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4032 struct page *page = st_bp->reserved_pages[i]; 4033 cnt = length - offset < do_count ? length - offset : do_count; 4034 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4035 if (res) 4036 return (-EFAULT); 4037 do_count -= cnt; 4038 st_bp->buffer_bytes -= cnt; 4039 st_bp->read_pointer += cnt; 4040 ubp += cnt; 4041 offset = 0; 4042 } 4043 if (do_count) /* Should never happen */ 4044 return (-EIO); 4045 4046 return 0; 4047} 4048 4049 4050/* Move data towards start of buffer */ 4051static void move_buffer_data(struct st_buffer * st_bp, int offset) 4052{ 4053 int src_seg, dst_seg, src_offset = 0, dst_offset; 4054 int count, total; 4055 int length = PAGE_SIZE << st_bp->reserved_page_order; 4056 4057 if (offset == 0) 4058 return; 4059 4060 total=st_bp->buffer_bytes - offset; 4061 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4062 src_offset = offset; 4063 if (src_offset < length) 4064 break; 4065 offset -= length; 4066 } 4067 4068 st_bp->buffer_bytes = st_bp->read_pointer = total; 4069 for (dst_seg=dst_offset=0; total > 0; ) { 4070 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4071 struct page *spage = st_bp->reserved_pages[src_seg]; 4072 4073 count = min(length - dst_offset, length - src_offset); 4074 memmove(page_address(dpage) + dst_offset, 4075 page_address(spage) + src_offset, count); 4076 src_offset += count; 4077 if (src_offset >= length) { 4078 src_seg++; 4079 src_offset = 0; 4080 } 4081 dst_offset += count; 4082 if (dst_offset >= length) { 4083 dst_seg++; 4084 dst_offset = 0; 4085 } 4086 total -= count; 4087 } 4088} 4089 4090/* Validate the options from command line or module parameters */ 4091static void validate_options(void) 4092{ 4093 if (buffer_kbs > 0) 4094 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4095 if (max_sg_segs >= ST_FIRST_SG) 4096 st_max_sg_segs = max_sg_segs; 4097} 4098 4099#ifndef MODULE 4100/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4101 */ 4102static int __init st_setup(char *str) 4103{ 4104 int i, len, ints[5]; 4105 char *stp; 4106 4107 stp = get_options(str, ARRAY_SIZE(ints), ints); 4108 4109 if (ints[0] > 0) { 4110 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4111 if (parms[i].val) 4112 *parms[i].val = ints[i + 1]; 4113 } else { 4114 while (stp != NULL) { 4115 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4116 len = strlen(parms[i].name); 4117 if (!strncmp(stp, parms[i].name, len) && 4118 (*(stp + len) == ':' || *(stp + len) == '=')) { 4119 if (parms[i].val) 4120 *parms[i].val = 4121 simple_strtoul(stp + len + 1, NULL, 0); 4122 else 4123 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4124 parms[i].name); 4125 break; 4126 } 4127 } 4128 if (i >= ARRAY_SIZE(parms)) 4129 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4130 stp); 4131 stp = strchr(stp, ','); 4132 if (stp) 4133 stp++; 4134 } 4135 } 4136 4137 validate_options(); 4138 4139 return 1; 4140} 4141 4142__setup("st=", st_setup); 4143 4144#endif 4145 4146static const struct file_operations st_fops = 4147{ 4148 .owner = THIS_MODULE, 4149 .read = st_read, 4150 .write = st_write, 4151 .unlocked_ioctl = st_ioctl, 4152#ifdef CONFIG_COMPAT 4153 .compat_ioctl = st_compat_ioctl, 4154#endif 4155 .open = st_open, 4156 .flush = st_flush, 4157 .release = st_release, 4158 .llseek = noop_llseek, 4159}; 4160 4161static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4162{ 4163 int i, error; 4164 dev_t cdev_devno; 4165 struct cdev *cdev; 4166 struct device *dev; 4167 struct st_modedef *STm = &(tape->modes[mode]); 4168 char name[10]; 4169 int dev_num = tape->index; 4170 4171 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4172 4173 cdev = cdev_alloc(); 4174 if (!cdev) { 4175 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4176 error = -ENOMEM; 4177 goto out; 4178 } 4179 cdev->owner = THIS_MODULE; 4180 cdev->ops = &st_fops; 4181 STm->cdevs[rew] = cdev; 4182 4183 error = cdev_add(cdev, cdev_devno, 1); 4184 if (error) { 4185 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4186 rew ? "non" : "auto", mode); 4187 pr_err("st%d: Device not attached.\n", dev_num); 4188 goto out_free; 4189 } 4190 4191 i = mode << (4 - ST_NBR_MODE_BITS); 4192 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4193 tape->name, st_formats[i]); 4194 4195 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4196 cdev_devno, &tape->modes[mode], "%s", name); 4197 if (IS_ERR(dev)) { 4198 pr_err("st%d: device_create failed\n", dev_num); 4199 error = PTR_ERR(dev); 4200 goto out_free; 4201 } 4202 4203 STm->devs[rew] = dev; 4204 4205 return 0; 4206out_free: 4207 cdev_del(STm->cdevs[rew]); 4208out: 4209 STm->cdevs[rew] = NULL; 4210 STm->devs[rew] = NULL; 4211 return error; 4212} 4213 4214static int create_cdevs(struct scsi_tape *tape) 4215{ 4216 int mode, error; 4217 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4218 error = create_one_cdev(tape, mode, 0); 4219 if (error) 4220 return error; 4221 error = create_one_cdev(tape, mode, 1); 4222 if (error) 4223 return error; 4224 } 4225 4226 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4227 &tape->modes[0].devs[0]->kobj, "tape"); 4228} 4229 4230static void remove_cdevs(struct scsi_tape *tape) 4231{ 4232 int mode, rew; 4233 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4234 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4235 struct st_modedef *STm = &(tape->modes[mode]); 4236 for (rew = 0; rew < 2; rew++) { 4237 if (STm->cdevs[rew]) 4238 cdev_del(STm->cdevs[rew]); 4239 if (STm->devs[rew]) 4240 device_unregister(STm->devs[rew]); 4241 } 4242 } 4243} 4244 4245static int st_probe(struct device *dev) 4246{ 4247 struct scsi_device *SDp = to_scsi_device(dev); 4248 struct scsi_tape *tpnt = NULL; 4249 struct st_modedef *STm; 4250 struct st_partstat *STps; 4251 struct st_buffer *buffer; 4252 int i, error; 4253 4254 if (SDp->type != TYPE_TAPE) 4255 return -ENODEV; 4256 if (st_incompatible(SDp)) { 4257 sdev_printk(KERN_INFO, SDp, 4258 "OnStream tapes are no longer supported;\n"); 4259 sdev_printk(KERN_INFO, SDp, 4260 "please mail to linux-scsi@vger.kernel.org.\n"); 4261 return -ENODEV; 4262 } 4263 4264 scsi_autopm_get_device(SDp); 4265 i = queue_max_segments(SDp->request_queue); 4266 if (st_max_sg_segs < i) 4267 i = st_max_sg_segs; 4268 buffer = new_tape_buffer(i); 4269 if (buffer == NULL) { 4270 sdev_printk(KERN_ERR, SDp, 4271 "st: Can't allocate new tape buffer. " 4272 "Device not attached.\n"); 4273 goto out; 4274 } 4275 4276 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4277 if (tpnt == NULL) { 4278 sdev_printk(KERN_ERR, SDp, 4279 "st: Can't allocate device descriptor.\n"); 4280 goto out_buffer_free; 4281 } 4282 kref_init(&tpnt->kref); 4283 4284 tpnt->device = SDp; 4285 if (SDp->scsi_level <= 2) 4286 tpnt->tape_type = MT_ISSCSI1; 4287 else 4288 tpnt->tape_type = MT_ISSCSI2; 4289 4290 tpnt->buffer = buffer; 4291 tpnt->buffer->last_SRpnt = NULL; 4292 4293 tpnt->inited = 0; 4294 tpnt->dirty = 0; 4295 tpnt->in_use = 0; 4296 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4297 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4298 tpnt->density = 0; 4299 tpnt->do_auto_lock = ST_AUTO_LOCK; 4300 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4301 tpnt->can_partitions = 0; 4302 tpnt->two_fm = ST_TWO_FM; 4303 tpnt->fast_mteom = ST_FAST_MTEOM; 4304 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4305 tpnt->sili = ST_SILI; 4306 tpnt->immediate = ST_NOWAIT; 4307 tpnt->immediate_filemark = 0; 4308 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4309 tpnt->partition = 0; 4310 tpnt->new_partition = 0; 4311 tpnt->nbr_partitions = 0; 4312 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4313 tpnt->long_timeout = ST_LONG_TIMEOUT; 4314 tpnt->try_dio = try_direct_io; 4315 4316 for (i = 0; i < ST_NBR_MODES; i++) { 4317 STm = &(tpnt->modes[i]); 4318 STm->defined = 0; 4319 STm->sysv = ST_SYSV; 4320 STm->defaults_for_writes = 0; 4321 STm->do_async_writes = ST_ASYNC_WRITES; 4322 STm->do_buffer_writes = ST_BUFFER_WRITES; 4323 STm->do_read_ahead = ST_READ_AHEAD; 4324 STm->default_compression = ST_DONT_TOUCH; 4325 STm->default_blksize = (-1); /* No forced size */ 4326 STm->default_density = (-1); /* No forced density */ 4327 STm->tape = tpnt; 4328 } 4329 4330 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4331 STps = &(tpnt->ps[i]); 4332 STps->rw = ST_IDLE; 4333 STps->eof = ST_NOEOF; 4334 STps->at_sm = 0; 4335 STps->last_block_valid = 0; 4336 STps->drv_block = (-1); 4337 STps->drv_file = (-1); 4338 } 4339 4340 tpnt->current_mode = 0; 4341 tpnt->modes[0].defined = 1; 4342 4343 tpnt->density_changed = tpnt->compression_changed = 4344 tpnt->blksize_changed = 0; 4345 mutex_init(&tpnt->lock); 4346 4347 idr_preload(GFP_KERNEL); 4348 spin_lock(&st_index_lock); 4349 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4350 spin_unlock(&st_index_lock); 4351 idr_preload_end(); 4352 if (error < 0) { 4353 pr_warn("st: idr allocation failed: %d\n", error); 4354 goto out_free_tape; 4355 } 4356 tpnt->index = error; 4357 sprintf(tpnt->name, "st%d", tpnt->index); 4358 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4359 if (tpnt->stats == NULL) { 4360 sdev_printk(KERN_ERR, SDp, 4361 "st: Can't allocate statistics.\n"); 4362 goto out_idr_remove; 4363 } 4364 4365 dev_set_drvdata(dev, tpnt); 4366 4367 4368 error = create_cdevs(tpnt); 4369 if (error) 4370 goto out_remove_devs; 4371 scsi_autopm_put_device(SDp); 4372 4373 sdev_printk(KERN_NOTICE, SDp, 4374 "Attached scsi tape %s\n", tpnt->name); 4375 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4376 tpnt->name, tpnt->try_dio ? "yes" : "no", 4377 queue_dma_alignment(SDp->request_queue) + 1); 4378 4379 return 0; 4380 4381out_remove_devs: 4382 remove_cdevs(tpnt); 4383 kfree(tpnt->stats); 4384out_idr_remove: 4385 spin_lock(&st_index_lock); 4386 idr_remove(&st_index_idr, tpnt->index); 4387 spin_unlock(&st_index_lock); 4388out_free_tape: 4389 kfree(tpnt); 4390out_buffer_free: 4391 kfree(buffer); 4392out: 4393 scsi_autopm_put_device(SDp); 4394 return -ENODEV; 4395}; 4396 4397 4398static int st_remove(struct device *dev) 4399{ 4400 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4401 int index = tpnt->index; 4402 4403 scsi_autopm_get_device(to_scsi_device(dev)); 4404 remove_cdevs(tpnt); 4405 4406 mutex_lock(&st_ref_mutex); 4407 kref_put(&tpnt->kref, scsi_tape_release); 4408 mutex_unlock(&st_ref_mutex); 4409 spin_lock(&st_index_lock); 4410 idr_remove(&st_index_idr, index); 4411 spin_unlock(&st_index_lock); 4412 return 0; 4413} 4414 4415/** 4416 * scsi_tape_release - Called to free the Scsi_Tape structure 4417 * @kref: pointer to embedded kref 4418 * 4419 * st_ref_mutex must be held entering this routine. Because it is 4420 * called on last put, you should always use the scsi_tape_get() 4421 * scsi_tape_put() helpers which manipulate the semaphore directly 4422 * and never do a direct kref_put(). 4423 **/ 4424static void scsi_tape_release(struct kref *kref) 4425{ 4426 struct scsi_tape *tpnt = to_scsi_tape(kref); 4427 4428 tpnt->device = NULL; 4429 4430 if (tpnt->buffer) { 4431 normalize_buffer(tpnt->buffer); 4432 kfree(tpnt->buffer->reserved_pages); 4433 kfree(tpnt->buffer); 4434 } 4435 4436 kfree(tpnt->stats); 4437 kfree(tpnt); 4438 return; 4439} 4440 4441static const struct class st_sysfs_class = { 4442 .name = "scsi_tape", 4443 .dev_groups = st_dev_groups, 4444}; 4445 4446static int __init init_st(void) 4447{ 4448 int err; 4449 4450 validate_options(); 4451 4452 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4453 verstr, st_fixed_buffer_size, st_max_sg_segs); 4454 4455 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4456 if (debugging) { 4457 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4458 debugging); 4459 } 4460 4461 err = class_register(&st_sysfs_class); 4462 if (err) { 4463 pr_err("Unable register sysfs class for SCSI tapes\n"); 4464 return err; 4465 } 4466 4467 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4468 ST_MAX_TAPE_ENTRIES, "st"); 4469 if (err) { 4470 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4471 SCSI_TAPE_MAJOR); 4472 goto err_class; 4473 } 4474 4475 err = scsi_register_driver(&st_template.gendrv); 4476 if (err) 4477 goto err_chrdev; 4478 4479 return 0; 4480 4481err_chrdev: 4482 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4483 ST_MAX_TAPE_ENTRIES); 4484err_class: 4485 class_unregister(&st_sysfs_class); 4486 return err; 4487} 4488 4489static void __exit exit_st(void) 4490{ 4491 scsi_unregister_driver(&st_template.gendrv); 4492 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4493 ST_MAX_TAPE_ENTRIES); 4494 class_unregister(&st_sysfs_class); 4495 idr_destroy(&st_index_idr); 4496 printk(KERN_INFO "st: Unloaded.\n"); 4497} 4498 4499module_init(init_st); 4500module_exit(exit_st); 4501 4502 4503/* The sysfs driver interface. Read-only at the moment */ 4504static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4505{ 4506 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4507} 4508static DRIVER_ATTR_RO(try_direct_io); 4509 4510static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4511{ 4512 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4513} 4514static DRIVER_ATTR_RO(fixed_buffer_size); 4515 4516static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4517{ 4518 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4519} 4520static DRIVER_ATTR_RO(max_sg_segs); 4521 4522static ssize_t version_show(struct device_driver *ddd, char *buf) 4523{ 4524 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4525} 4526static DRIVER_ATTR_RO(version); 4527 4528#if DEBUG 4529static ssize_t debug_flag_store(struct device_driver *ddp, 4530 const char *buf, size_t count) 4531{ 4532/* We only care what the first byte of the data is the rest is unused. 4533 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4534 * other values have -EINVAL returned if they are passed in. 4535 */ 4536 if (count > 0) { 4537 if (buf[0] == '0') { 4538 debugging = NO_DEBUG; 4539 return count; 4540 } else if (buf[0] == '1') { 4541 debugging = 1; 4542 return count; 4543 } 4544 } 4545 return -EINVAL; 4546} 4547 4548static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4549{ 4550 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4551} 4552static DRIVER_ATTR_RW(debug_flag); 4553#endif 4554 4555static struct attribute *st_drv_attrs[] = { 4556 &driver_attr_try_direct_io.attr, 4557 &driver_attr_fixed_buffer_size.attr, 4558 &driver_attr_max_sg_segs.attr, 4559 &driver_attr_version.attr, 4560#if DEBUG 4561 &driver_attr_debug_flag.attr, 4562#endif 4563 NULL, 4564}; 4565ATTRIBUTE_GROUPS(st_drv); 4566 4567/* The sysfs simple class interface */ 4568static ssize_t 4569defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4570{ 4571 struct st_modedef *STm = dev_get_drvdata(dev); 4572 ssize_t l = 0; 4573 4574 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4575 return l; 4576} 4577static DEVICE_ATTR_RO(defined); 4578 4579static ssize_t 4580default_blksize_show(struct device *dev, struct device_attribute *attr, 4581 char *buf) 4582{ 4583 struct st_modedef *STm = dev_get_drvdata(dev); 4584 ssize_t l = 0; 4585 4586 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4587 return l; 4588} 4589static DEVICE_ATTR_RO(default_blksize); 4590 4591static ssize_t 4592default_density_show(struct device *dev, struct device_attribute *attr, 4593 char *buf) 4594{ 4595 struct st_modedef *STm = dev_get_drvdata(dev); 4596 ssize_t l = 0; 4597 char *fmt; 4598 4599 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4600 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4601 return l; 4602} 4603static DEVICE_ATTR_RO(default_density); 4604 4605static ssize_t 4606default_compression_show(struct device *dev, struct device_attribute *attr, 4607 char *buf) 4608{ 4609 struct st_modedef *STm = dev_get_drvdata(dev); 4610 ssize_t l = 0; 4611 4612 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4613 return l; 4614} 4615static DEVICE_ATTR_RO(default_compression); 4616 4617static ssize_t 4618options_show(struct device *dev, struct device_attribute *attr, char *buf) 4619{ 4620 struct st_modedef *STm = dev_get_drvdata(dev); 4621 struct scsi_tape *STp = STm->tape; 4622 int options; 4623 ssize_t l = 0; 4624 4625 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4626 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4627 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4628 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4629 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4630 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4631 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4632 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4633 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4634 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4635 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4636 options |= STm->sysv ? MT_ST_SYSV : 0; 4637 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4638 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4639 options |= STp->sili ? MT_ST_SILI : 0; 4640 4641 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4642 return l; 4643} 4644static DEVICE_ATTR_RO(options); 4645 4646/* Support for tape stats */ 4647 4648/** 4649 * read_cnt_show - return read count - count of reads made from tape drive 4650 * @dev: struct device 4651 * @attr: attribute structure 4652 * @buf: buffer to return formatted data in 4653 */ 4654static ssize_t read_cnt_show(struct device *dev, 4655 struct device_attribute *attr, char *buf) 4656{ 4657 struct st_modedef *STm = dev_get_drvdata(dev); 4658 4659 return sprintf(buf, "%lld", 4660 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4661} 4662static DEVICE_ATTR_RO(read_cnt); 4663 4664/** 4665 * read_byte_cnt_show - return read byte count - tape drives 4666 * may use blocks less than 512 bytes this gives the raw byte count of 4667 * of data read from the tape drive. 4668 * @dev: struct device 4669 * @attr: attribute structure 4670 * @buf: buffer to return formatted data in 4671 */ 4672static ssize_t read_byte_cnt_show(struct device *dev, 4673 struct device_attribute *attr, char *buf) 4674{ 4675 struct st_modedef *STm = dev_get_drvdata(dev); 4676 4677 return sprintf(buf, "%lld", 4678 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4679} 4680static DEVICE_ATTR_RO(read_byte_cnt); 4681 4682/** 4683 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4684 * @dev: struct device 4685 * @attr: attribute structure 4686 * @buf: buffer to return formatted data in 4687 */ 4688static ssize_t read_ns_show(struct device *dev, 4689 struct device_attribute *attr, char *buf) 4690{ 4691 struct st_modedef *STm = dev_get_drvdata(dev); 4692 4693 return sprintf(buf, "%lld", 4694 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4695} 4696static DEVICE_ATTR_RO(read_ns); 4697 4698/** 4699 * write_cnt_show - write count - number of user calls 4700 * to write(2) that have written data to tape. 4701 * @dev: struct device 4702 * @attr: attribute structure 4703 * @buf: buffer to return formatted data in 4704 */ 4705static ssize_t write_cnt_show(struct device *dev, 4706 struct device_attribute *attr, char *buf) 4707{ 4708 struct st_modedef *STm = dev_get_drvdata(dev); 4709 4710 return sprintf(buf, "%lld", 4711 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4712} 4713static DEVICE_ATTR_RO(write_cnt); 4714 4715/** 4716 * write_byte_cnt_show - write byte count - raw count of 4717 * bytes written to tape. 4718 * @dev: struct device 4719 * @attr: attribute structure 4720 * @buf: buffer to return formatted data in 4721 */ 4722static ssize_t write_byte_cnt_show(struct device *dev, 4723 struct device_attribute *attr, char *buf) 4724{ 4725 struct st_modedef *STm = dev_get_drvdata(dev); 4726 4727 return sprintf(buf, "%lld", 4728 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4729} 4730static DEVICE_ATTR_RO(write_byte_cnt); 4731 4732/** 4733 * write_ns_show - write ns - number of nanoseconds waiting on write 4734 * requests to complete. 4735 * @dev: struct device 4736 * @attr: attribute structure 4737 * @buf: buffer to return formatted data in 4738 */ 4739static ssize_t write_ns_show(struct device *dev, 4740 struct device_attribute *attr, char *buf) 4741{ 4742 struct st_modedef *STm = dev_get_drvdata(dev); 4743 4744 return sprintf(buf, "%lld", 4745 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4746} 4747static DEVICE_ATTR_RO(write_ns); 4748 4749/** 4750 * in_flight_show - number of I/Os currently in flight - 4751 * in most cases this will be either 0 or 1. It may be higher if someone 4752 * has also issued other SCSI commands such as via an ioctl. 4753 * @dev: struct device 4754 * @attr: attribute structure 4755 * @buf: buffer to return formatted data in 4756 */ 4757static ssize_t in_flight_show(struct device *dev, 4758 struct device_attribute *attr, char *buf) 4759{ 4760 struct st_modedef *STm = dev_get_drvdata(dev); 4761 4762 return sprintf(buf, "%lld", 4763 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4764} 4765static DEVICE_ATTR_RO(in_flight); 4766 4767/** 4768 * io_ns_show - io wait ns - this is the number of ns spent 4769 * waiting on all I/O to complete. This includes tape movement commands 4770 * such as rewinding, seeking to end of file or tape, it also includes 4771 * read and write. To determine the time spent on tape movement 4772 * subtract the read and write ns from this value. 4773 * @dev: struct device 4774 * @attr: attribute structure 4775 * @buf: buffer to return formatted data in 4776 */ 4777static ssize_t io_ns_show(struct device *dev, 4778 struct device_attribute *attr, char *buf) 4779{ 4780 struct st_modedef *STm = dev_get_drvdata(dev); 4781 4782 return sprintf(buf, "%lld", 4783 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4784} 4785static DEVICE_ATTR_RO(io_ns); 4786 4787/** 4788 * other_cnt_show - other io count - this is the number of 4789 * I/O requests other than read and write requests. 4790 * Typically these are tape movement requests but will include driver 4791 * tape movement. This includes only requests issued by the st driver. 4792 * @dev: struct device 4793 * @attr: attribute structure 4794 * @buf: buffer to return formatted data in 4795 */ 4796static ssize_t other_cnt_show(struct device *dev, 4797 struct device_attribute *attr, char *buf) 4798{ 4799 struct st_modedef *STm = dev_get_drvdata(dev); 4800 4801 return sprintf(buf, "%lld", 4802 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4803} 4804static DEVICE_ATTR_RO(other_cnt); 4805 4806/** 4807 * resid_cnt_show - A count of the number of times we get a residual 4808 * count - this should indicate someone issuing reads larger than the 4809 * block size on tape. 4810 * @dev: struct device 4811 * @attr: attribute structure 4812 * @buf: buffer to return formatted data in 4813 */ 4814static ssize_t resid_cnt_show(struct device *dev, 4815 struct device_attribute *attr, char *buf) 4816{ 4817 struct st_modedef *STm = dev_get_drvdata(dev); 4818 4819 return sprintf(buf, "%lld", 4820 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4821} 4822static DEVICE_ATTR_RO(resid_cnt); 4823 4824static struct attribute *st_dev_attrs[] = { 4825 &dev_attr_defined.attr, 4826 &dev_attr_default_blksize.attr, 4827 &dev_attr_default_density.attr, 4828 &dev_attr_default_compression.attr, 4829 &dev_attr_options.attr, 4830 NULL, 4831}; 4832 4833static struct attribute *st_stats_attrs[] = { 4834 &dev_attr_read_cnt.attr, 4835 &dev_attr_read_byte_cnt.attr, 4836 &dev_attr_read_ns.attr, 4837 &dev_attr_write_cnt.attr, 4838 &dev_attr_write_byte_cnt.attr, 4839 &dev_attr_write_ns.attr, 4840 &dev_attr_in_flight.attr, 4841 &dev_attr_io_ns.attr, 4842 &dev_attr_other_cnt.attr, 4843 &dev_attr_resid_cnt.attr, 4844 NULL, 4845}; 4846 4847static struct attribute_group stats_group = { 4848 .name = "stats", 4849 .attrs = st_stats_attrs, 4850}; 4851 4852static struct attribute_group st_group = { 4853 .attrs = st_dev_attrs, 4854}; 4855 4856static const struct attribute_group *st_dev_groups[] = { 4857 &st_group, 4858 &stats_group, 4859 NULL, 4860}; 4861 4862/* The following functions may be useful for a larger audience. */ 4863static int sgl_map_user_pages(struct st_buffer *STbp, 4864 const unsigned int max_pages, unsigned long uaddr, 4865 size_t count, int rw) 4866{ 4867 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4868 unsigned long start = uaddr >> PAGE_SHIFT; 4869 const int nr_pages = end - start; 4870 int res, i; 4871 struct page **pages; 4872 struct rq_map_data *mdata = &STbp->map_data; 4873 4874 /* User attempted Overflow! */ 4875 if ((uaddr + count) < uaddr) 4876 return -EINVAL; 4877 4878 /* Too big */ 4879 if (nr_pages > max_pages) 4880 return -ENOMEM; 4881 4882 /* Hmm? */ 4883 if (count == 0) 4884 return 0; 4885 4886 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4887 if (pages == NULL) 4888 return -ENOMEM; 4889 4890 /* Try to fault in all of the necessary pages */ 4891 /* rw==READ means read from drive, write into memory area */ 4892 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0, 4893 pages); 4894 4895 /* Errors and no page mapped should return here */ 4896 if (res < nr_pages) 4897 goto out_unmap; 4898 4899 for (i=0; i < nr_pages; i++) { 4900 /* FIXME: flush superflous for rw==READ, 4901 * probably wrong function for rw==WRITE 4902 */ 4903 flush_dcache_page(pages[i]); 4904 } 4905 4906 mdata->offset = uaddr & ~PAGE_MASK; 4907 STbp->mapped_pages = pages; 4908 4909 return nr_pages; 4910 out_unmap: 4911 if (res > 0) { 4912 unpin_user_pages(pages, res); 4913 res = 0; 4914 } 4915 kfree(pages); 4916 return res; 4917} 4918 4919 4920/* And unmap them... */ 4921static int sgl_unmap_user_pages(struct st_buffer *STbp, 4922 const unsigned int nr_pages, int dirtied) 4923{ 4924 /* FIXME: cache flush missing for rw==READ */ 4925 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied); 4926 4927 kfree(STbp->mapped_pages); 4928 STbp->mapped_pages = NULL; 4929 4930 return 0; 4931} 4932