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