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