1 /* 2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying 3 file Documentation/scsi/st.txt for more information. 4 5 History: 6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. 7 Contribution and ideas from several people including (in alphabetical 8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, 9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, 10 Michael Schaefer, J"org Weule, and Eric Youngdale. 11 12 Copyright 1992 - 2016 Kai Makisara 13 email Kai.Makisara@kolumbus.fi 14 15 Some small formal changes - aeb, 950809 16 17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 18 */ 19 20 static const char *verstr = "20160209"; 21 22 #include <linux/module.h> 23 24 #include <linux/fs.h> 25 #include <linux/kernel.h> 26 #include <linux/sched/signal.h> 27 #include <linux/mm.h> 28 #include <linux/init.h> 29 #include <linux/string.h> 30 #include <linux/slab.h> 31 #include <linux/errno.h> 32 #include <linux/mtio.h> 33 #include <linux/cdrom.h> 34 #include <linux/ioctl.h> 35 #include <linux/fcntl.h> 36 #include <linux/spinlock.h> 37 #include <linux/blkdev.h> 38 #include <linux/moduleparam.h> 39 #include <linux/cdev.h> 40 #include <linux/idr.h> 41 #include <linux/delay.h> 42 #include <linux/mutex.h> 43 44 #include <linux/uaccess.h> 45 #include <asm/dma.h> 46 47 #include <scsi/scsi.h> 48 #include <scsi/scsi_dbg.h> 49 #include <scsi/scsi_device.h> 50 #include <scsi/scsi_driver.h> 51 #include <scsi/scsi_eh.h> 52 #include <scsi/scsi_host.h> 53 #include <scsi/scsi_ioctl.h> 54 #include <scsi/sg.h> 55 56 57 /* The driver prints some debugging information on the console if DEBUG 58 is defined and non-zero. */ 59 #define DEBUG 1 60 #define NO_DEBUG 0 61 62 #define ST_DEB_MSG KERN_NOTICE 63 #if DEBUG 64 /* The message level for the debug messages is currently set to KERN_NOTICE 65 so that people can easily see the messages. Later when the debugging messages 66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 67 #define DEB(a) a 68 #define DEBC(a) if (debugging) { a ; } 69 #else 70 #define DEB(a) 71 #define DEBC(a) 72 #endif 73 74 #define ST_KILOBYTE 1024 75 76 #include "st_options.h" 77 #include "st.h" 78 79 static int buffer_kbs; 80 static int max_sg_segs; 81 static int try_direct_io = TRY_DIRECT_IO; 82 static int try_rdio = 1; 83 static int try_wdio = 1; 84 static int debug_flag; 85 86 static struct class st_sysfs_class; 87 static const struct attribute_group *st_dev_groups[]; 88 static const struct attribute_group *st_drv_groups[]; 89 90 MODULE_AUTHOR("Kai Makisara"); 91 MODULE_DESCRIPTION("SCSI tape (st) driver"); 92 MODULE_LICENSE("GPL"); 93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 95 96 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 97 * of sysfs parameters (which module_param doesn't yet support). 98 * Sysfs parameters defined explicitly later. 99 */ 100 module_param_named(buffer_kbs, buffer_kbs, int, 0); 101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 102 module_param_named(max_sg_segs, max_sg_segs, int, 0); 103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 104 module_param_named(try_direct_io, try_direct_io, int, 0); 105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 106 module_param_named(debug_flag, debug_flag, int, 0); 107 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 108 109 110 /* Extra parameters for testing */ 111 module_param_named(try_rdio, try_rdio, int, 0); 112 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 113 module_param_named(try_wdio, try_wdio, int, 0); 114 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 115 116 #ifndef MODULE 117 static int write_threshold_kbs; /* retained for compatibility */ 118 static struct st_dev_parm { 119 char *name; 120 int *val; 121 } parms[] __initdata = { 122 { 123 "buffer_kbs", &buffer_kbs 124 }, 125 { /* Retained for compatibility with 2.4 */ 126 "write_threshold_kbs", &write_threshold_kbs 127 }, 128 { 129 "max_sg_segs", NULL 130 }, 131 { 132 "try_direct_io", &try_direct_io 133 }, 134 { 135 "debug_flag", &debug_flag 136 } 137 }; 138 #endif 139 140 /* Restrict the number of modes so that names for all are assigned */ 141 #if ST_NBR_MODES > 16 142 #error "Maximum number of modes is 16" 143 #endif 144 /* Bit reversed order to get same names for same minors with all 145 mode counts */ 146 static const char *st_formats[] = { 147 "", "r", "k", "s", "l", "t", "o", "u", 148 "m", "v", "p", "x", "a", "y", "q", "z"}; 149 150 /* The default definitions have been moved to st_options.h */ 151 152 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 153 154 /* The buffer size should fit into the 24 bits for length in the 155 6-byte SCSI read and write commands. */ 156 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 157 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 158 #endif 159 160 static int debugging = DEBUG; 161 162 #define MAX_RETRIES 0 163 #define MAX_WRITE_RETRIES 0 164 #define MAX_READY_RETRIES 0 165 #define NO_TAPE NOT_READY 166 167 #define ST_TIMEOUT (900 * HZ) 168 #define ST_LONG_TIMEOUT (14000 * HZ) 169 170 /* Remove mode bits and auto-rewind bit (7) */ 171 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) 173 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 174 175 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 176 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 178 179 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 180 24 bits) */ 181 #define SET_DENS_AND_BLK 0x10001 182 183 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 184 static int st_max_sg_segs = ST_MAX_SG; 185 186 static int modes_defined; 187 188 static int enlarge_buffer(struct st_buffer *, int, int); 189 static void clear_buffer(struct st_buffer *); 190 static void normalize_buffer(struct st_buffer *); 191 static int append_to_buffer(const char __user *, struct st_buffer *, int); 192 static int from_buffer(struct st_buffer *, char __user *, int); 193 static void move_buffer_data(struct st_buffer *, int); 194 195 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 196 unsigned long, size_t, int); 197 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 198 199 static int st_probe(struct device *); 200 static int st_remove(struct device *); 201 202 static struct scsi_driver st_template = { 203 .gendrv = { 204 .name = "st", 205 .owner = THIS_MODULE, 206 .probe = st_probe, 207 .remove = st_remove, 208 .groups = st_drv_groups, 209 }, 210 }; 211 212 static int st_compression(struct scsi_tape *, int); 213 214 static int find_partition(struct scsi_tape *); 215 static int switch_partition(struct scsi_tape *); 216 217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 218 219 static void scsi_tape_release(struct kref *); 220 221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 222 223 static DEFINE_MUTEX(st_ref_mutex); 224 static DEFINE_SPINLOCK(st_index_lock); 225 static DEFINE_SPINLOCK(st_use_lock); 226 static DEFINE_IDR(st_index_idr); 227 228 229 230 #include "osst_detect.h" 231 #ifndef SIGS_FROM_OSST 232 #define SIGS_FROM_OSST \ 233 {"OnStream", "SC-", "", "osst"}, \ 234 {"OnStream", "DI-", "", "osst"}, \ 235 {"OnStream", "DP-", "", "osst"}, \ 236 {"OnStream", "USB", "", "osst"}, \ 237 {"OnStream", "FW-", "", "osst"} 238 #endif 239 240 static struct scsi_tape *scsi_tape_get(int dev) 241 { 242 struct scsi_tape *STp = NULL; 243 244 mutex_lock(&st_ref_mutex); 245 spin_lock(&st_index_lock); 246 247 STp = idr_find(&st_index_idr, dev); 248 if (!STp) goto out; 249 250 kref_get(&STp->kref); 251 252 if (!STp->device) 253 goto out_put; 254 255 if (scsi_device_get(STp->device)) 256 goto out_put; 257 258 goto out; 259 260 out_put: 261 kref_put(&STp->kref, scsi_tape_release); 262 STp = NULL; 263 out: 264 spin_unlock(&st_index_lock); 265 mutex_unlock(&st_ref_mutex); 266 return STp; 267 } 268 269 static void scsi_tape_put(struct scsi_tape *STp) 270 { 271 struct scsi_device *sdev = STp->device; 272 273 mutex_lock(&st_ref_mutex); 274 kref_put(&STp->kref, scsi_tape_release); 275 scsi_device_put(sdev); 276 mutex_unlock(&st_ref_mutex); 277 } 278 279 struct st_reject_data { 280 char *vendor; 281 char *model; 282 char *rev; 283 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 284 }; 285 286 static struct st_reject_data reject_list[] = { 287 /* {"XXX", "Yy-", "", NULL}, example */ 288 SIGS_FROM_OSST, 289 {NULL, }}; 290 291 /* If the device signature is on the list of incompatible drives, the 292 function returns a pointer to the name of the correct driver (if known) */ 293 static char * st_incompatible(struct scsi_device* SDp) 294 { 295 struct st_reject_data *rp; 296 297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 299 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 301 if (rp->driver_hint) 302 return rp->driver_hint; 303 else 304 return "unknown"; 305 } 306 return NULL; 307 } 308 309 310 static inline char *tape_name(struct scsi_tape *tape) 311 { 312 return tape->disk->disk_name; 313 } 314 315 #define st_printk(prefix, t, fmt, a...) \ 316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) 317 #ifdef DEBUG 318 #define DEBC_printk(t, fmt, a...) \ 319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 320 #else 321 #define DEBC_printk(t, fmt, a...) 322 #endif 323 324 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 325 { 326 const u8 *ucp; 327 const u8 *sense = SRpnt->sense; 328 329 s->have_sense = scsi_normalize_sense(SRpnt->sense, 330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 331 s->flags = 0; 332 333 if (s->have_sense) { 334 s->deferred = 0; 335 s->remainder_valid = 336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 337 switch (sense[0] & 0x7f) { 338 case 0x71: 339 s->deferred = 1; 340 case 0x70: 341 s->fixed_format = 1; 342 s->flags = sense[2] & 0xe0; 343 break; 344 case 0x73: 345 s->deferred = 1; 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 = tape_name(STp); 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 0x%x, host bt 0x%x).\n", 390 result, driver_byte(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_put_request(req->q, 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 = blk_get_request(SRpnt->stp->device->request_queue, 547 data_direction == DMA_TO_DEVICE ? 548 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); 549 if (IS_ERR(req)) 550 return DRIVER_ERROR << 24; 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_put_request(req); 561 return DRIVER_ERROR << 24; 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->q, NULL, req, 1, 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_buffer *STbuffer; 832 struct st_partstat *STps; 833 834 STbuffer = STp->buffer; 835 836 /* 837 * If there was a bus reset, block further access 838 * to this device. 839 */ 840 if (STp->pos_unknown) 841 return (-EIO); 842 843 if (STp->ready != ST_READY) 844 return 0; 845 STps = &(STp->ps[STp->partition]); 846 if (STps->rw == ST_WRITING) /* Writing */ 847 return st_flush_write_buffer(STp); 848 849 if (STp->block_size == 0) 850 return 0; 851 852 backspace = ((STp->buffer)->buffer_bytes + 853 (STp->buffer)->read_pointer) / STp->block_size - 854 ((STp->buffer)->read_pointer + STp->block_size - 1) / 855 STp->block_size; 856 (STp->buffer)->buffer_bytes = 0; 857 (STp->buffer)->read_pointer = 0; 858 result = 0; 859 if (!seek_next) { 860 if (STps->eof == ST_FM_HIT) { 861 result = cross_eof(STp, 0); /* Back over the EOF hit */ 862 if (!result) 863 STps->eof = ST_NOEOF; 864 else { 865 if (STps->drv_file >= 0) 866 STps->drv_file++; 867 STps->drv_block = 0; 868 } 869 } 870 if (!result && backspace > 0) 871 result = st_int_ioctl(STp, MTBSR, backspace); 872 } else if (STps->eof == ST_FM_HIT) { 873 if (STps->drv_file >= 0) 874 STps->drv_file++; 875 STps->drv_block = 0; 876 STps->eof = ST_NOEOF; 877 } 878 return result; 879 880 } 881 882 /* Set the mode parameters */ 883 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 884 { 885 int set_it = 0; 886 unsigned long arg; 887 888 if (!STp->density_changed && 889 STm->default_density >= 0 && 890 STm->default_density != STp->density) { 891 arg = STm->default_density; 892 set_it = 1; 893 } else 894 arg = STp->density; 895 arg <<= MT_ST_DENSITY_SHIFT; 896 if (!STp->blksize_changed && 897 STm->default_blksize >= 0 && 898 STm->default_blksize != STp->block_size) { 899 arg |= STm->default_blksize; 900 set_it = 1; 901 } else 902 arg |= STp->block_size; 903 if (set_it && 904 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 905 st_printk(KERN_WARNING, STp, 906 "Can't set default block size to %d bytes " 907 "and density %x.\n", 908 STm->default_blksize, STm->default_density); 909 if (modes_defined) 910 return (-EINVAL); 911 } 912 return 0; 913 } 914 915 916 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 917 static int do_door_lock(struct scsi_tape * STp, int do_lock) 918 { 919 int retval; 920 921 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 922 923 retval = scsi_set_medium_removal(STp->device, 924 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 925 if (!retval) 926 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 927 else 928 STp->door_locked = ST_LOCK_FAILS; 929 return retval; 930 } 931 932 933 /* Set the internal state after reset */ 934 static void reset_state(struct scsi_tape *STp) 935 { 936 int i; 937 struct st_partstat *STps; 938 939 STp->pos_unknown = 0; 940 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 941 STps = &(STp->ps[i]); 942 STps->rw = ST_IDLE; 943 STps->eof = ST_NOEOF; 944 STps->at_sm = 0; 945 STps->last_block_valid = 0; 946 STps->drv_block = -1; 947 STps->drv_file = -1; 948 } 949 if (STp->can_partitions) { 950 STp->partition = find_partition(STp); 951 if (STp->partition < 0) 952 STp->partition = 0; 953 STp->new_partition = STp->partition; 954 } 955 } 956 957 /* Test if the drive is ready. Returns either one of the codes below or a negative system 958 error code. */ 959 #define CHKRES_READY 0 960 #define CHKRES_NEW_SESSION 1 961 #define CHKRES_NOT_READY 2 962 #define CHKRES_NO_TAPE 3 963 964 #define MAX_ATTENTIONS 10 965 966 static int test_ready(struct scsi_tape *STp, int do_wait) 967 { 968 int attentions, waits, max_wait, scode; 969 int retval = CHKRES_READY, new_session = 0; 970 unsigned char cmd[MAX_COMMAND_SIZE]; 971 struct st_request *SRpnt = NULL; 972 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 973 974 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 975 976 for (attentions=waits=0; ; ) { 977 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 978 cmd[0] = TEST_UNIT_READY; 979 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 980 STp->long_timeout, MAX_READY_RETRIES, 1); 981 982 if (!SRpnt) { 983 retval = (STp->buffer)->syscall_result; 984 break; 985 } 986 987 if (cmdstatp->have_sense) { 988 989 scode = cmdstatp->sense_hdr.sense_key; 990 991 if (scode == UNIT_ATTENTION) { /* New media? */ 992 new_session = 1; 993 if (attentions < MAX_ATTENTIONS) { 994 attentions++; 995 continue; 996 } 997 else { 998 retval = (-EIO); 999 break; 1000 } 1001 } 1002 1003 if (scode == NOT_READY) { 1004 if (waits < max_wait) { 1005 if (msleep_interruptible(1000)) { 1006 retval = (-EINTR); 1007 break; 1008 } 1009 waits++; 1010 continue; 1011 } 1012 else { 1013 if ((STp->device)->scsi_level >= SCSI_2 && 1014 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1015 retval = CHKRES_NO_TAPE; 1016 else 1017 retval = CHKRES_NOT_READY; 1018 break; 1019 } 1020 } 1021 } 1022 1023 retval = (STp->buffer)->syscall_result; 1024 if (!retval) 1025 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1026 break; 1027 } 1028 1029 if (SRpnt != NULL) 1030 st_release_request(SRpnt); 1031 return retval; 1032 } 1033 1034 1035 /* See if the drive is ready and gather information about the tape. Return values: 1036 < 0 negative error code from errno.h 1037 0 drive ready 1038 1 drive not ready (possibly no tape) 1039 */ 1040 static int check_tape(struct scsi_tape *STp, struct file *filp) 1041 { 1042 int i, retval, new_session = 0, do_wait; 1043 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1044 unsigned short st_flags = filp->f_flags; 1045 struct st_request *SRpnt = NULL; 1046 struct st_modedef *STm; 1047 struct st_partstat *STps; 1048 struct inode *inode = file_inode(filp); 1049 int mode = TAPE_MODE(inode); 1050 1051 STp->ready = ST_READY; 1052 1053 if (mode != STp->current_mode) { 1054 DEBC_printk(STp, "Mode change from %d to %d.\n", 1055 STp->current_mode, mode); 1056 new_session = 1; 1057 STp->current_mode = mode; 1058 } 1059 STm = &(STp->modes[STp->current_mode]); 1060 1061 saved_cleaning = STp->cleaning_req; 1062 STp->cleaning_req = 0; 1063 1064 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1065 retval = test_ready(STp, do_wait); 1066 1067 if (retval < 0) 1068 goto err_out; 1069 1070 if (retval == CHKRES_NEW_SESSION) { 1071 STp->pos_unknown = 0; 1072 STp->partition = STp->new_partition = 0; 1073 if (STp->can_partitions) 1074 STp->nbr_partitions = 1; /* This guess will be updated later 1075 if necessary */ 1076 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1077 STps = &(STp->ps[i]); 1078 STps->rw = ST_IDLE; 1079 STps->eof = ST_NOEOF; 1080 STps->at_sm = 0; 1081 STps->last_block_valid = 0; 1082 STps->drv_block = 0; 1083 STps->drv_file = 0; 1084 } 1085 new_session = 1; 1086 } 1087 else { 1088 STp->cleaning_req |= saved_cleaning; 1089 1090 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1091 if (retval == CHKRES_NO_TAPE) 1092 STp->ready = ST_NO_TAPE; 1093 else 1094 STp->ready = ST_NOT_READY; 1095 1096 STp->density = 0; /* Clear the erroneous "residue" */ 1097 STp->write_prot = 0; 1098 STp->block_size = 0; 1099 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1100 STp->partition = STp->new_partition = 0; 1101 STp->door_locked = ST_UNLOCKED; 1102 return CHKRES_NOT_READY; 1103 } 1104 } 1105 1106 if (STp->omit_blklims) 1107 STp->min_block = STp->max_block = (-1); 1108 else { 1109 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1110 cmd[0] = READ_BLOCK_LIMITS; 1111 1112 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1113 STp->device->request_queue->rq_timeout, 1114 MAX_READY_RETRIES, 1); 1115 if (!SRpnt) { 1116 retval = (STp->buffer)->syscall_result; 1117 goto err_out; 1118 } 1119 1120 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1121 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1122 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1123 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1124 (STp->buffer)->b_data[5]; 1125 if ( DEB( debugging || ) !STp->inited) 1126 st_printk(KERN_INFO, STp, 1127 "Block limits %d - %d bytes.\n", 1128 STp->min_block, STp->max_block); 1129 } else { 1130 STp->min_block = STp->max_block = (-1); 1131 DEBC_printk(STp, "Can't read block limits.\n"); 1132 } 1133 } 1134 1135 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1136 cmd[0] = MODE_SENSE; 1137 cmd[4] = 12; 1138 1139 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1140 STp->device->request_queue->rq_timeout, 1141 MAX_READY_RETRIES, 1); 1142 if (!SRpnt) { 1143 retval = (STp->buffer)->syscall_result; 1144 goto err_out; 1145 } 1146 1147 if ((STp->buffer)->syscall_result != 0) { 1148 DEBC_printk(STp, "No Mode Sense.\n"); 1149 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1150 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1151 STp->drv_write_prot = 0; 1152 } else { 1153 DEBC_printk(STp,"Mode sense. Length %d, " 1154 "medium %x, WBS %x, BLL %d\n", 1155 (STp->buffer)->b_data[0], 1156 (STp->buffer)->b_data[1], 1157 (STp->buffer)->b_data[2], 1158 (STp->buffer)->b_data[3]); 1159 1160 if ((STp->buffer)->b_data[3] >= 8) { 1161 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1162 STp->density = (STp->buffer)->b_data[4]; 1163 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1164 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1165 DEBC_printk(STp, "Density %x, tape length: %x, " 1166 "drv buffer: %d\n", 1167 STp->density, 1168 (STp->buffer)->b_data[5] * 65536 + 1169 (STp->buffer)->b_data[6] * 256 + 1170 (STp->buffer)->b_data[7], 1171 STp->drv_buffer); 1172 } 1173 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1174 if (!STp->drv_buffer && STp->immediate_filemark) { 1175 st_printk(KERN_WARNING, STp, 1176 "non-buffered tape: disabling " 1177 "writing immediate filemarks\n"); 1178 STp->immediate_filemark = 0; 1179 } 1180 } 1181 st_release_request(SRpnt); 1182 SRpnt = NULL; 1183 STp->inited = 1; 1184 1185 if (STp->block_size > 0) 1186 (STp->buffer)->buffer_blocks = 1187 (STp->buffer)->buffer_size / STp->block_size; 1188 else 1189 (STp->buffer)->buffer_blocks = 1; 1190 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1191 1192 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1193 STp->block_size, (STp->buffer)->buffer_size, 1194 (STp->buffer)->buffer_blocks); 1195 1196 if (STp->drv_write_prot) { 1197 STp->write_prot = 1; 1198 1199 DEBC_printk(STp, "Write protected\n"); 1200 1201 if (do_wait && 1202 ((st_flags & O_ACCMODE) == O_WRONLY || 1203 (st_flags & O_ACCMODE) == O_RDWR)) { 1204 retval = (-EROFS); 1205 goto err_out; 1206 } 1207 } 1208 1209 if (STp->can_partitions && STp->nbr_partitions < 1) { 1210 /* This code is reached when the device is opened for the first time 1211 after the driver has been initialized with tape in the drive and the 1212 partition support has been enabled. */ 1213 DEBC_printk(STp, "Updating partition number in status.\n"); 1214 if ((STp->partition = find_partition(STp)) < 0) { 1215 retval = STp->partition; 1216 goto err_out; 1217 } 1218 STp->new_partition = STp->partition; 1219 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1220 } 1221 1222 if (new_session) { /* Change the drive parameters for the new mode */ 1223 STp->density_changed = STp->blksize_changed = 0; 1224 STp->compression_changed = 0; 1225 if (!(STm->defaults_for_writes) && 1226 (retval = set_mode_densblk(STp, STm)) < 0) 1227 goto err_out; 1228 1229 if (STp->default_drvbuffer != 0xff) { 1230 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1231 st_printk(KERN_WARNING, STp, 1232 "Can't set default drive " 1233 "buffering to %d.\n", 1234 STp->default_drvbuffer); 1235 } 1236 } 1237 1238 return CHKRES_READY; 1239 1240 err_out: 1241 return retval; 1242 } 1243 1244 1245 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1246 module count. */ 1247 static int st_open(struct inode *inode, struct file *filp) 1248 { 1249 int i, retval = (-EIO); 1250 int resumed = 0; 1251 struct scsi_tape *STp; 1252 struct st_partstat *STps; 1253 int dev = TAPE_NR(inode); 1254 1255 /* 1256 * We really want to do nonseekable_open(inode, filp); here, but some 1257 * versions of tar incorrectly call lseek on tapes and bail out if that 1258 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1259 */ 1260 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1261 1262 if (!(STp = scsi_tape_get(dev))) { 1263 return -ENXIO; 1264 } 1265 1266 filp->private_data = STp; 1267 1268 spin_lock(&st_use_lock); 1269 if (STp->in_use) { 1270 spin_unlock(&st_use_lock); 1271 scsi_tape_put(STp); 1272 DEBC_printk(STp, "Device already in use.\n"); 1273 return (-EBUSY); 1274 } 1275 1276 STp->in_use = 1; 1277 spin_unlock(&st_use_lock); 1278 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1279 1280 if (scsi_autopm_get_device(STp->device) < 0) { 1281 retval = -EIO; 1282 goto err_out; 1283 } 1284 resumed = 1; 1285 if (!scsi_block_when_processing_errors(STp->device)) { 1286 retval = (-ENXIO); 1287 goto err_out; 1288 } 1289 1290 /* See that we have at least a one page buffer available */ 1291 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1292 st_printk(KERN_WARNING, STp, 1293 "Can't allocate one page tape buffer.\n"); 1294 retval = (-EOVERFLOW); 1295 goto err_out; 1296 } 1297 1298 (STp->buffer)->cleared = 0; 1299 (STp->buffer)->writing = 0; 1300 (STp->buffer)->syscall_result = 0; 1301 1302 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1303 1304 STp->dirty = 0; 1305 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1306 STps = &(STp->ps[i]); 1307 STps->rw = ST_IDLE; 1308 } 1309 STp->try_dio_now = STp->try_dio; 1310 STp->recover_count = 0; 1311 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1312 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1313 1314 retval = check_tape(STp, filp); 1315 if (retval < 0) 1316 goto err_out; 1317 if ((filp->f_flags & O_NONBLOCK) == 0 && 1318 retval != CHKRES_READY) { 1319 if (STp->ready == NO_TAPE) 1320 retval = (-ENOMEDIUM); 1321 else 1322 retval = (-EIO); 1323 goto err_out; 1324 } 1325 return 0; 1326 1327 err_out: 1328 normalize_buffer(STp->buffer); 1329 spin_lock(&st_use_lock); 1330 STp->in_use = 0; 1331 spin_unlock(&st_use_lock); 1332 if (resumed) 1333 scsi_autopm_put_device(STp->device); 1334 scsi_tape_put(STp); 1335 return retval; 1336 1337 } 1338 1339 1340 /* Flush the tape buffer before close */ 1341 static int st_flush(struct file *filp, fl_owner_t id) 1342 { 1343 int result = 0, result2; 1344 unsigned char cmd[MAX_COMMAND_SIZE]; 1345 struct st_request *SRpnt; 1346 struct scsi_tape *STp = filp->private_data; 1347 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1348 struct st_partstat *STps = &(STp->ps[STp->partition]); 1349 1350 if (file_count(filp) > 1) 1351 return 0; 1352 1353 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1354 result = st_flush_write_buffer(STp); 1355 if (result != 0 && result != (-ENOSPC)) 1356 goto out; 1357 } 1358 1359 if (STp->can_partitions && 1360 (result2 = switch_partition(STp)) < 0) { 1361 DEBC_printk(STp, "switch_partition at close failed.\n"); 1362 if (result == 0) 1363 result = result2; 1364 goto out; 1365 } 1366 1367 DEBC( if (STp->nbr_requests) 1368 st_printk(KERN_DEBUG, STp, 1369 "Number of r/w requests %d, dio used in %d, " 1370 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1371 STp->nbr_pages)); 1372 1373 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1374 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1375 1376 #if DEBUG 1377 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1378 STp->nbr_waits, STp->nbr_finished); 1379 #endif 1380 memset(cmd, 0, MAX_COMMAND_SIZE); 1381 cmd[0] = WRITE_FILEMARKS; 1382 if (STp->immediate_filemark) 1383 cmd[1] = 1; 1384 cmd[4] = 1 + STp->two_fm; 1385 1386 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1387 STp->device->request_queue->rq_timeout, 1388 MAX_WRITE_RETRIES, 1); 1389 if (!SRpnt) { 1390 result = (STp->buffer)->syscall_result; 1391 goto out; 1392 } 1393 1394 if (STp->buffer->syscall_result == 0 || 1395 (cmdstatp->have_sense && !cmdstatp->deferred && 1396 (cmdstatp->flags & SENSE_EOM) && 1397 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1398 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1399 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1400 /* Write successful at EOM */ 1401 st_release_request(SRpnt); 1402 SRpnt = NULL; 1403 if (STps->drv_file >= 0) 1404 STps->drv_file++; 1405 STps->drv_block = 0; 1406 if (STp->two_fm) 1407 cross_eof(STp, 0); 1408 STps->eof = ST_FM; 1409 } 1410 else { /* Write error */ 1411 st_release_request(SRpnt); 1412 SRpnt = NULL; 1413 st_printk(KERN_ERR, STp, 1414 "Error on write filemark.\n"); 1415 if (result == 0) 1416 result = (-EIO); 1417 } 1418 1419 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1420 } else if (!STp->rew_at_close) { 1421 STps = &(STp->ps[STp->partition]); 1422 if (!STm->sysv || STps->rw != ST_READING) { 1423 if (STp->can_bsr) 1424 result = flush_buffer(STp, 0); 1425 else if (STps->eof == ST_FM_HIT) { 1426 result = cross_eof(STp, 0); 1427 if (result) { 1428 if (STps->drv_file >= 0) 1429 STps->drv_file++; 1430 STps->drv_block = 0; 1431 STps->eof = ST_FM; 1432 } else 1433 STps->eof = ST_NOEOF; 1434 } 1435 } else if ((STps->eof == ST_NOEOF && 1436 !(result = cross_eof(STp, 1))) || 1437 STps->eof == ST_FM_HIT) { 1438 if (STps->drv_file >= 0) 1439 STps->drv_file++; 1440 STps->drv_block = 0; 1441 STps->eof = ST_FM; 1442 } 1443 } 1444 1445 out: 1446 if (STp->rew_at_close) { 1447 result2 = st_int_ioctl(STp, MTREW, 1); 1448 if (result == 0) 1449 result = result2; 1450 } 1451 return result; 1452 } 1453 1454 1455 /* Close the device and release it. BKL is not needed: this is the only thread 1456 accessing this tape. */ 1457 static int st_release(struct inode *inode, struct file *filp) 1458 { 1459 int result = 0; 1460 struct scsi_tape *STp = filp->private_data; 1461 1462 if (STp->door_locked == ST_LOCKED_AUTO) 1463 do_door_lock(STp, 0); 1464 1465 normalize_buffer(STp->buffer); 1466 spin_lock(&st_use_lock); 1467 STp->in_use = 0; 1468 spin_unlock(&st_use_lock); 1469 scsi_autopm_put_device(STp->device); 1470 scsi_tape_put(STp); 1471 1472 return result; 1473 } 1474 1475 /* The checks common to both reading and writing */ 1476 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1477 { 1478 ssize_t retval = 0; 1479 1480 /* 1481 * If we are in the middle of error recovery, don't let anyone 1482 * else try and use this device. Also, if error recovery fails, it 1483 * may try and take the device offline, in which case all further 1484 * access to the device is prohibited. 1485 */ 1486 if (!scsi_block_when_processing_errors(STp->device)) { 1487 retval = (-ENXIO); 1488 goto out; 1489 } 1490 1491 if (STp->ready != ST_READY) { 1492 if (STp->ready == ST_NO_TAPE) 1493 retval = (-ENOMEDIUM); 1494 else 1495 retval = (-EIO); 1496 goto out; 1497 } 1498 1499 if (! STp->modes[STp->current_mode].defined) { 1500 retval = (-ENXIO); 1501 goto out; 1502 } 1503 1504 1505 /* 1506 * If there was a bus reset, block further access 1507 * to this device. 1508 */ 1509 if (STp->pos_unknown) { 1510 retval = (-EIO); 1511 goto out; 1512 } 1513 1514 if (count == 0) 1515 goto out; 1516 1517 DEB( 1518 if (!STp->in_use) { 1519 st_printk(ST_DEB_MSG, STp, 1520 "Incorrect device.\n"); 1521 retval = (-EIO); 1522 goto out; 1523 } ) /* end DEB */ 1524 1525 if (STp->can_partitions && 1526 (retval = switch_partition(STp)) < 0) 1527 goto out; 1528 1529 if (STp->block_size == 0 && STp->max_block > 0 && 1530 (count < STp->min_block || count > STp->max_block)) { 1531 retval = (-EINVAL); 1532 goto out; 1533 } 1534 1535 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1536 !do_door_lock(STp, 1)) 1537 STp->door_locked = ST_LOCKED_AUTO; 1538 1539 out: 1540 return retval; 1541 } 1542 1543 1544 static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1545 size_t count, int is_read) 1546 { 1547 int i, bufsize, retval = 0; 1548 struct st_buffer *STbp = STp->buffer; 1549 1550 if (is_read) 1551 i = STp->try_dio_now && try_rdio; 1552 else 1553 i = STp->try_dio_now && try_wdio; 1554 1555 if (i && ((unsigned long)buf & queue_dma_alignment( 1556 STp->device->request_queue)) == 0) { 1557 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1558 count, (is_read ? READ : WRITE)); 1559 if (i > 0) { 1560 STbp->do_dio = i; 1561 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1562 } 1563 else 1564 STbp->do_dio = 0; /* fall back to buffering with any error */ 1565 STbp->sg_segs = STbp->do_dio; 1566 DEB( 1567 if (STbp->do_dio) { 1568 STp->nbr_dio++; 1569 STp->nbr_pages += STbp->do_dio; 1570 } 1571 ) 1572 } else 1573 STbp->do_dio = 0; 1574 DEB( STp->nbr_requests++; ) 1575 1576 if (!STbp->do_dio) { 1577 if (STp->block_size) 1578 bufsize = STp->block_size > st_fixed_buffer_size ? 1579 STp->block_size : st_fixed_buffer_size; 1580 else { 1581 bufsize = count; 1582 /* Make sure that data from previous user is not leaked even if 1583 HBA does not return correct residual */ 1584 if (is_read && STp->sili && !STbp->cleared) 1585 clear_buffer(STbp); 1586 } 1587 1588 if (bufsize > STbp->buffer_size && 1589 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { 1590 st_printk(KERN_WARNING, STp, 1591 "Can't allocate %d byte tape buffer.\n", 1592 bufsize); 1593 retval = (-EOVERFLOW); 1594 goto out; 1595 } 1596 if (STp->block_size) 1597 STbp->buffer_blocks = bufsize / STp->block_size; 1598 } 1599 1600 out: 1601 return retval; 1602 } 1603 1604 1605 /* Can be called more than once after each setup_buffer() */ 1606 static void release_buffering(struct scsi_tape *STp, int is_read) 1607 { 1608 struct st_buffer *STbp; 1609 1610 STbp = STp->buffer; 1611 if (STbp->do_dio) { 1612 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1613 STbp->do_dio = 0; 1614 STbp->sg_segs = 0; 1615 } 1616 } 1617 1618 1619 /* Write command */ 1620 static ssize_t 1621 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1622 { 1623 ssize_t total; 1624 ssize_t i, do_count, blks, transfer; 1625 ssize_t retval; 1626 int undone, retry_eot = 0, scode; 1627 int async_write; 1628 unsigned char cmd[MAX_COMMAND_SIZE]; 1629 const char __user *b_point; 1630 struct st_request *SRpnt = NULL; 1631 struct scsi_tape *STp = filp->private_data; 1632 struct st_modedef *STm; 1633 struct st_partstat *STps; 1634 struct st_buffer *STbp; 1635 1636 if (mutex_lock_interruptible(&STp->lock)) 1637 return -ERESTARTSYS; 1638 1639 retval = rw_checks(STp, filp, count); 1640 if (retval || count == 0) 1641 goto out; 1642 1643 /* Write must be integral number of blocks */ 1644 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1645 st_printk(KERN_WARNING, STp, 1646 "Write not multiple of tape block size.\n"); 1647 retval = (-EINVAL); 1648 goto out; 1649 } 1650 1651 STm = &(STp->modes[STp->current_mode]); 1652 STps = &(STp->ps[STp->partition]); 1653 1654 if (STp->write_prot) { 1655 retval = (-EACCES); 1656 goto out; 1657 } 1658 1659 1660 if (STps->rw == ST_READING) { 1661 retval = flush_buffer(STp, 0); 1662 if (retval) 1663 goto out; 1664 STps->rw = ST_WRITING; 1665 } else if (STps->rw != ST_WRITING && 1666 STps->drv_file == 0 && STps->drv_block == 0) { 1667 if ((retval = set_mode_densblk(STp, STm)) < 0) 1668 goto out; 1669 if (STm->default_compression != ST_DONT_TOUCH && 1670 !(STp->compression_changed)) { 1671 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1672 st_printk(KERN_WARNING, STp, 1673 "Can't set default compression.\n"); 1674 if (modes_defined) { 1675 retval = (-EINVAL); 1676 goto out; 1677 } 1678 } 1679 } 1680 } 1681 1682 STbp = STp->buffer; 1683 i = write_behind_check(STp); 1684 if (i) { 1685 if (i == -ENOSPC) 1686 STps->eof = ST_EOM_OK; 1687 else 1688 STps->eof = ST_EOM_ERROR; 1689 } 1690 1691 if (STps->eof == ST_EOM_OK) { 1692 STps->eof = ST_EOD_1; /* allow next write */ 1693 retval = (-ENOSPC); 1694 goto out; 1695 } 1696 else if (STps->eof == ST_EOM_ERROR) { 1697 retval = (-EIO); 1698 goto out; 1699 } 1700 1701 /* Check the buffer readability in cases where copy_user might catch 1702 the problems after some tape movement. */ 1703 if (STp->block_size != 0 && 1704 !STbp->do_dio && 1705 (copy_from_user(&i, buf, 1) != 0 || 1706 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1707 retval = (-EFAULT); 1708 goto out; 1709 } 1710 1711 retval = setup_buffering(STp, buf, count, 0); 1712 if (retval) 1713 goto out; 1714 1715 total = count; 1716 1717 memset(cmd, 0, MAX_COMMAND_SIZE); 1718 cmd[0] = WRITE_6; 1719 cmd[1] = (STp->block_size != 0); 1720 1721 STps->rw = ST_WRITING; 1722 1723 b_point = buf; 1724 while (count > 0 && !retry_eot) { 1725 1726 if (STbp->do_dio) { 1727 do_count = count; 1728 } 1729 else { 1730 if (STp->block_size == 0) 1731 do_count = count; 1732 else { 1733 do_count = STbp->buffer_blocks * STp->block_size - 1734 STbp->buffer_bytes; 1735 if (do_count > count) 1736 do_count = count; 1737 } 1738 1739 i = append_to_buffer(b_point, STbp, do_count); 1740 if (i) { 1741 retval = i; 1742 goto out; 1743 } 1744 } 1745 count -= do_count; 1746 b_point += do_count; 1747 1748 async_write = STp->block_size == 0 && !STbp->do_dio && 1749 STm->do_async_writes && STps->eof < ST_EOM_OK; 1750 1751 if (STp->block_size != 0 && STm->do_buffer_writes && 1752 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1753 STbp->buffer_bytes < STbp->buffer_size) { 1754 STp->dirty = 1; 1755 /* Don't write a buffer that is not full enough. */ 1756 if (!async_write && count == 0) 1757 break; 1758 } 1759 1760 retry_write: 1761 if (STp->block_size == 0) 1762 blks = transfer = do_count; 1763 else { 1764 if (!STbp->do_dio) 1765 blks = STbp->buffer_bytes; 1766 else 1767 blks = do_count; 1768 blks /= STp->block_size; 1769 transfer = blks * STp->block_size; 1770 } 1771 cmd[2] = blks >> 16; 1772 cmd[3] = blks >> 8; 1773 cmd[4] = blks; 1774 1775 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1776 STp->device->request_queue->rq_timeout, 1777 MAX_WRITE_RETRIES, !async_write); 1778 if (!SRpnt) { 1779 retval = STbp->syscall_result; 1780 goto out; 1781 } 1782 if (async_write && !STbp->syscall_result) { 1783 STbp->writing = transfer; 1784 STp->dirty = !(STbp->writing == 1785 STbp->buffer_bytes); 1786 SRpnt = NULL; /* Prevent releasing this request! */ 1787 DEB( STp->write_pending = 1; ) 1788 break; 1789 } 1790 1791 if (STbp->syscall_result != 0) { 1792 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1793 1794 DEBC_printk(STp, "Error on write:\n"); 1795 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1796 scode = cmdstatp->sense_hdr.sense_key; 1797 if (cmdstatp->remainder_valid) 1798 undone = (int)cmdstatp->uremainder64; 1799 else if (STp->block_size == 0 && 1800 scode == VOLUME_OVERFLOW) 1801 undone = transfer; 1802 else 1803 undone = 0; 1804 if (STp->block_size != 0) 1805 undone *= STp->block_size; 1806 if (undone <= do_count) { 1807 /* Only data from this write is not written */ 1808 count += undone; 1809 b_point -= undone; 1810 do_count -= undone; 1811 if (STp->block_size) 1812 blks = (transfer - undone) / STp->block_size; 1813 STps->eof = ST_EOM_OK; 1814 /* Continue in fixed block mode if all written 1815 in this request but still something left to write 1816 (retval left to zero) 1817 */ 1818 if (STp->block_size == 0 || 1819 undone > 0 || count == 0) 1820 retval = (-ENOSPC); /* EOM within current request */ 1821 DEBC_printk(STp, "EOM with %d " 1822 "bytes unwritten.\n", 1823 (int)count); 1824 } else { 1825 /* EOT within data buffered earlier (possible only 1826 in fixed block mode without direct i/o) */ 1827 if (!retry_eot && !cmdstatp->deferred && 1828 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1829 move_buffer_data(STp->buffer, transfer - undone); 1830 retry_eot = 1; 1831 if (STps->drv_block >= 0) { 1832 STps->drv_block += (transfer - undone) / 1833 STp->block_size; 1834 } 1835 STps->eof = ST_EOM_OK; 1836 DEBC_printk(STp, "Retry " 1837 "write of %d " 1838 "bytes at EOM.\n", 1839 STp->buffer->buffer_bytes); 1840 goto retry_write; 1841 } 1842 else { 1843 /* Either error within data buffered by driver or 1844 failed retry */ 1845 count -= do_count; 1846 blks = do_count = 0; 1847 STps->eof = ST_EOM_ERROR; 1848 STps->drv_block = (-1); /* Too cautious? */ 1849 retval = (-EIO); /* EOM for old data */ 1850 DEBC_printk(STp, "EOM with " 1851 "lost data.\n"); 1852 } 1853 } 1854 } else { 1855 count += do_count; 1856 STps->drv_block = (-1); /* Too cautious? */ 1857 retval = STbp->syscall_result; 1858 } 1859 1860 } 1861 1862 if (STps->drv_block >= 0) { 1863 if (STp->block_size == 0) 1864 STps->drv_block += (do_count > 0); 1865 else 1866 STps->drv_block += blks; 1867 } 1868 1869 STbp->buffer_bytes = 0; 1870 STp->dirty = 0; 1871 1872 if (retval || retry_eot) { 1873 if (count < total) 1874 retval = total - count; 1875 goto out; 1876 } 1877 } 1878 1879 if (STps->eof == ST_EOD_1) 1880 STps->eof = ST_EOM_OK; 1881 else if (STps->eof != ST_EOM_OK) 1882 STps->eof = ST_NOEOF; 1883 retval = total - count; 1884 1885 out: 1886 if (SRpnt != NULL) 1887 st_release_request(SRpnt); 1888 release_buffering(STp, 0); 1889 mutex_unlock(&STp->lock); 1890 1891 return retval; 1892 } 1893 1894 /* Read data from the tape. Returns zero in the normal case, one if the 1895 eof status has changed, and the negative error code in case of a 1896 fatal error. Otherwise updates the buffer and the eof state. 1897 1898 Does release user buffer mapping if it is set. 1899 */ 1900 static long read_tape(struct scsi_tape *STp, long count, 1901 struct st_request ** aSRpnt) 1902 { 1903 int transfer, blks, bytes; 1904 unsigned char cmd[MAX_COMMAND_SIZE]; 1905 struct st_request *SRpnt; 1906 struct st_modedef *STm; 1907 struct st_partstat *STps; 1908 struct st_buffer *STbp; 1909 int retval = 0; 1910 1911 if (count == 0) 1912 return 0; 1913 1914 STm = &(STp->modes[STp->current_mode]); 1915 STps = &(STp->ps[STp->partition]); 1916 if (STps->eof == ST_FM_HIT) 1917 return 1; 1918 STbp = STp->buffer; 1919 1920 if (STp->block_size == 0) 1921 blks = bytes = count; 1922 else { 1923 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1924 blks = (STp->buffer)->buffer_blocks; 1925 bytes = blks * STp->block_size; 1926 } else { 1927 bytes = count; 1928 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1929 bytes = (STp->buffer)->buffer_size; 1930 blks = bytes / STp->block_size; 1931 bytes = blks * STp->block_size; 1932 } 1933 } 1934 1935 memset(cmd, 0, MAX_COMMAND_SIZE); 1936 cmd[0] = READ_6; 1937 cmd[1] = (STp->block_size != 0); 1938 if (!cmd[1] && STp->sili) 1939 cmd[1] |= 2; 1940 cmd[2] = blks >> 16; 1941 cmd[3] = blks >> 8; 1942 cmd[4] = blks; 1943 1944 SRpnt = *aSRpnt; 1945 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1946 STp->device->request_queue->rq_timeout, 1947 MAX_RETRIES, 1); 1948 release_buffering(STp, 1); 1949 *aSRpnt = SRpnt; 1950 if (!SRpnt) 1951 return STbp->syscall_result; 1952 1953 STbp->read_pointer = 0; 1954 STps->at_sm = 0; 1955 1956 /* Something to check */ 1957 if (STbp->syscall_result) { 1958 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1959 1960 retval = 1; 1961 DEBC_printk(STp, 1962 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1963 SRpnt->sense[0], SRpnt->sense[1], 1964 SRpnt->sense[2], SRpnt->sense[3], 1965 SRpnt->sense[4], SRpnt->sense[5], 1966 SRpnt->sense[6], SRpnt->sense[7]); 1967 if (cmdstatp->have_sense) { 1968 1969 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1970 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1971 1972 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1973 /* Compute the residual count */ 1974 if (cmdstatp->remainder_valid) 1975 transfer = (int)cmdstatp->uremainder64; 1976 else 1977 transfer = 0; 1978 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) { 1979 if (STp->block_size == 0) 1980 transfer = bytes; 1981 /* Some drives set ILI with MEDIUM ERROR */ 1982 cmdstatp->flags &= ~SENSE_ILI; 1983 } 1984 1985 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1986 if (STp->block_size == 0 && 1987 transfer < 0) { 1988 st_printk(KERN_NOTICE, STp, 1989 "Failed to read %d " 1990 "byte block with %d " 1991 "byte transfer.\n", 1992 bytes - transfer, 1993 bytes); 1994 if (STps->drv_block >= 0) 1995 STps->drv_block += 1; 1996 STbp->buffer_bytes = 0; 1997 return (-ENOMEM); 1998 } else if (STp->block_size == 0) { 1999 STbp->buffer_bytes = bytes - transfer; 2000 } else { 2001 st_release_request(SRpnt); 2002 SRpnt = *aSRpnt = NULL; 2003 if (transfer == blks) { /* We did not get anything, error */ 2004 st_printk(KERN_NOTICE, STp, 2005 "Incorrect " 2006 "block size.\n"); 2007 if (STps->drv_block >= 0) 2008 STps->drv_block += blks - transfer + 1; 2009 st_int_ioctl(STp, MTBSR, 1); 2010 return (-EIO); 2011 } 2012 /* We have some data, deliver it */ 2013 STbp->buffer_bytes = (blks - transfer) * 2014 STp->block_size; 2015 DEBC_printk(STp, "ILI but " 2016 "enough data " 2017 "received %ld " 2018 "%d.\n", count, 2019 STbp->buffer_bytes); 2020 if (STps->drv_block >= 0) 2021 STps->drv_block += 1; 2022 if (st_int_ioctl(STp, MTBSR, 1)) 2023 return (-EIO); 2024 } 2025 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 2026 if (STps->eof != ST_FM_HIT) 2027 STps->eof = ST_FM_HIT; 2028 else 2029 STps->eof = ST_EOD_2; 2030 if (STp->block_size == 0) 2031 STbp->buffer_bytes = 0; 2032 else 2033 STbp->buffer_bytes = 2034 bytes - transfer * STp->block_size; 2035 DEBC_printk(STp, "EOF detected (%d " 2036 "bytes read).\n", 2037 STbp->buffer_bytes); 2038 } else if (cmdstatp->flags & SENSE_EOM) { 2039 if (STps->eof == ST_FM) 2040 STps->eof = ST_EOD_1; 2041 else 2042 STps->eof = ST_EOM_OK; 2043 if (STp->block_size == 0) 2044 STbp->buffer_bytes = bytes - transfer; 2045 else 2046 STbp->buffer_bytes = 2047 bytes - transfer * STp->block_size; 2048 2049 DEBC_printk(STp, "EOM detected (%d " 2050 "bytes read).\n", 2051 STbp->buffer_bytes); 2052 } 2053 } 2054 /* end of EOF, EOM, ILI test */ 2055 else { /* nonzero sense key */ 2056 DEBC_printk(STp, "Tape error while reading.\n"); 2057 STps->drv_block = (-1); 2058 if (STps->eof == ST_FM && 2059 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 2060 DEBC_printk(STp, "Zero returned for " 2061 "first BLANK CHECK " 2062 "after EOF.\n"); 2063 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 2064 } else /* Some other extended sense code */ 2065 retval = (-EIO); 2066 } 2067 2068 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 2069 STbp->buffer_bytes = 0; 2070 } 2071 /* End of extended sense test */ 2072 else { /* Non-extended sense */ 2073 retval = STbp->syscall_result; 2074 } 2075 2076 } 2077 /* End of error handling */ 2078 else { /* Read successful */ 2079 STbp->buffer_bytes = bytes; 2080 if (STp->sili) /* In fixed block mode residual is always zero here */ 2081 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2082 } 2083 2084 if (STps->drv_block >= 0) { 2085 if (STp->block_size == 0) 2086 STps->drv_block++; 2087 else 2088 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2089 } 2090 return retval; 2091 } 2092 2093 2094 /* Read command */ 2095 static ssize_t 2096 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2097 { 2098 ssize_t total; 2099 ssize_t retval = 0; 2100 ssize_t i, transfer; 2101 int special, do_dio = 0; 2102 struct st_request *SRpnt = NULL; 2103 struct scsi_tape *STp = filp->private_data; 2104 struct st_modedef *STm; 2105 struct st_partstat *STps; 2106 struct st_buffer *STbp = STp->buffer; 2107 2108 if (mutex_lock_interruptible(&STp->lock)) 2109 return -ERESTARTSYS; 2110 2111 retval = rw_checks(STp, filp, count); 2112 if (retval || count == 0) 2113 goto out; 2114 2115 STm = &(STp->modes[STp->current_mode]); 2116 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2117 if (!STm->do_read_ahead) { 2118 retval = (-EINVAL); /* Read must be integral number of blocks */ 2119 goto out; 2120 } 2121 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2122 } 2123 2124 STps = &(STp->ps[STp->partition]); 2125 if (STps->rw == ST_WRITING) { 2126 retval = flush_buffer(STp, 0); 2127 if (retval) 2128 goto out; 2129 STps->rw = ST_READING; 2130 } 2131 DEB( 2132 if (debugging && STps->eof != ST_NOEOF) 2133 st_printk(ST_DEB_MSG, STp, 2134 "EOF/EOM flag up (%d). Bytes %d\n", 2135 STps->eof, STbp->buffer_bytes); 2136 ) /* end DEB */ 2137 2138 retval = setup_buffering(STp, buf, count, 1); 2139 if (retval) 2140 goto out; 2141 do_dio = STbp->do_dio; 2142 2143 if (STbp->buffer_bytes == 0 && 2144 STps->eof >= ST_EOD_1) { 2145 if (STps->eof < ST_EOD) { 2146 STps->eof += 1; 2147 retval = 0; 2148 goto out; 2149 } 2150 retval = (-EIO); /* EOM or Blank Check */ 2151 goto out; 2152 } 2153 2154 if (do_dio) { 2155 /* Check the buffer writability before any tape movement. Don't alter 2156 buffer data. */ 2157 if (copy_from_user(&i, buf, 1) != 0 || 2158 copy_to_user(buf, &i, 1) != 0 || 2159 copy_from_user(&i, buf + count - 1, 1) != 0 || 2160 copy_to_user(buf + count - 1, &i, 1) != 0) { 2161 retval = (-EFAULT); 2162 goto out; 2163 } 2164 } 2165 2166 STps->rw = ST_READING; 2167 2168 2169 /* Loop until enough data in buffer or a special condition found */ 2170 for (total = 0, special = 0; total < count && !special;) { 2171 2172 /* Get new data if the buffer is empty */ 2173 if (STbp->buffer_bytes == 0) { 2174 special = read_tape(STp, count - total, &SRpnt); 2175 if (special < 0) { /* No need to continue read */ 2176 retval = special; 2177 goto out; 2178 } 2179 } 2180 2181 /* Move the data from driver buffer to user buffer */ 2182 if (STbp->buffer_bytes > 0) { 2183 DEB( 2184 if (debugging && STps->eof != ST_NOEOF) 2185 st_printk(ST_DEB_MSG, STp, 2186 "EOF up (%d). Left %d, needed %d.\n", 2187 STps->eof, STbp->buffer_bytes, 2188 (int)(count - total)); 2189 ) /* end DEB */ 2190 transfer = STbp->buffer_bytes < count - total ? 2191 STbp->buffer_bytes : count - total; 2192 if (!do_dio) { 2193 i = from_buffer(STbp, buf, transfer); 2194 if (i) { 2195 retval = i; 2196 goto out; 2197 } 2198 } 2199 buf += transfer; 2200 total += transfer; 2201 } 2202 2203 if (STp->block_size == 0) 2204 break; /* Read only one variable length block */ 2205 2206 } /* for (total = 0, special = 0; 2207 total < count && !special; ) */ 2208 2209 /* Change the eof state if no data from tape or buffer */ 2210 if (total == 0) { 2211 if (STps->eof == ST_FM_HIT) { 2212 STps->eof = ST_FM; 2213 STps->drv_block = 0; 2214 if (STps->drv_file >= 0) 2215 STps->drv_file++; 2216 } else if (STps->eof == ST_EOD_1) { 2217 STps->eof = ST_EOD_2; 2218 STps->drv_block = 0; 2219 if (STps->drv_file >= 0) 2220 STps->drv_file++; 2221 } else if (STps->eof == ST_EOD_2) 2222 STps->eof = ST_EOD; 2223 } else if (STps->eof == ST_FM) 2224 STps->eof = ST_NOEOF; 2225 retval = total; 2226 2227 out: 2228 if (SRpnt != NULL) { 2229 st_release_request(SRpnt); 2230 SRpnt = NULL; 2231 } 2232 if (do_dio) { 2233 release_buffering(STp, 1); 2234 STbp->buffer_bytes = 0; 2235 } 2236 mutex_unlock(&STp->lock); 2237 2238 return retval; 2239 } 2240 2241 2242 2243 DEB( 2244 /* Set the driver options */ 2245 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) 2246 { 2247 if (debugging) { 2248 st_printk(KERN_INFO, STp, 2249 "Mode %d options: buffer writes: %d, " 2250 "async writes: %d, read ahead: %d\n", 2251 STp->current_mode, STm->do_buffer_writes, 2252 STm->do_async_writes, STm->do_read_ahead); 2253 st_printk(KERN_INFO, STp, 2254 " can bsr: %d, two FMs: %d, " 2255 "fast mteom: %d, auto lock: %d,\n", 2256 STp->can_bsr, STp->two_fm, STp->fast_mteom, 2257 STp->do_auto_lock); 2258 st_printk(KERN_INFO, STp, 2259 " defs for wr: %d, no block limits: %d, " 2260 "partitions: %d, s2 log: %d\n", 2261 STm->defaults_for_writes, STp->omit_blklims, 2262 STp->can_partitions, STp->scsi2_logical); 2263 st_printk(KERN_INFO, STp, 2264 " sysv: %d nowait: %d sili: %d " 2265 "nowait_filemark: %d\n", 2266 STm->sysv, STp->immediate, STp->sili, 2267 STp->immediate_filemark); 2268 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); 2269 } 2270 } 2271 ) 2272 2273 2274 static int st_set_options(struct scsi_tape *STp, long options) 2275 { 2276 int value; 2277 long code; 2278 struct st_modedef *STm; 2279 struct cdev *cd0, *cd1; 2280 struct device *d0, *d1; 2281 2282 STm = &(STp->modes[STp->current_mode]); 2283 if (!STm->defined) { 2284 cd0 = STm->cdevs[0]; 2285 cd1 = STm->cdevs[1]; 2286 d0 = STm->devs[0]; 2287 d1 = STm->devs[1]; 2288 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2289 STm->cdevs[0] = cd0; 2290 STm->cdevs[1] = cd1; 2291 STm->devs[0] = d0; 2292 STm->devs[1] = d1; 2293 modes_defined = 1; 2294 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", 2295 STp->current_mode); 2296 } 2297 2298 code = options & MT_ST_OPTIONS; 2299 if (code == MT_ST_BOOLEANS) { 2300 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2301 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2302 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2303 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2304 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2305 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2306 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2307 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2308 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2309 if ((STp->device)->scsi_level >= SCSI_2) 2310 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2311 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2312 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2313 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2314 STm->sysv = (options & MT_ST_SYSV) != 0; 2315 STp->sili = (options & MT_ST_SILI) != 0; 2316 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2317 st_log_options(STp, STm); ) 2318 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2319 value = (code == MT_ST_SETBOOLEANS); 2320 if ((options & MT_ST_BUFFER_WRITES) != 0) 2321 STm->do_buffer_writes = value; 2322 if ((options & MT_ST_ASYNC_WRITES) != 0) 2323 STm->do_async_writes = value; 2324 if ((options & MT_ST_DEF_WRITES) != 0) 2325 STm->defaults_for_writes = value; 2326 if ((options & MT_ST_READ_AHEAD) != 0) 2327 STm->do_read_ahead = value; 2328 if ((options & MT_ST_TWO_FM) != 0) 2329 STp->two_fm = value; 2330 if ((options & MT_ST_FAST_MTEOM) != 0) 2331 STp->fast_mteom = value; 2332 if ((options & MT_ST_AUTO_LOCK) != 0) 2333 STp->do_auto_lock = value; 2334 if ((options & MT_ST_CAN_BSR) != 0) 2335 STp->can_bsr = value; 2336 if ((options & MT_ST_NO_BLKLIMS) != 0) 2337 STp->omit_blklims = value; 2338 if ((STp->device)->scsi_level >= SCSI_2 && 2339 (options & MT_ST_CAN_PARTITIONS) != 0) 2340 STp->can_partitions = value; 2341 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2342 STp->scsi2_logical = value; 2343 if ((options & MT_ST_NOWAIT) != 0) 2344 STp->immediate = value; 2345 if ((options & MT_ST_NOWAIT_EOF) != 0) 2346 STp->immediate_filemark = value; 2347 if ((options & MT_ST_SYSV) != 0) 2348 STm->sysv = value; 2349 if ((options & MT_ST_SILI) != 0) 2350 STp->sili = value; 2351 DEB( 2352 if ((options & MT_ST_DEBUGGING) != 0) 2353 debugging = value; 2354 st_log_options(STp, STm); ) 2355 } else if (code == MT_ST_WRITE_THRESHOLD) { 2356 /* Retained for compatibility */ 2357 } else if (code == MT_ST_DEF_BLKSIZE) { 2358 value = (options & ~MT_ST_OPTIONS); 2359 if (value == ~MT_ST_OPTIONS) { 2360 STm->default_blksize = (-1); 2361 DEBC_printk(STp, "Default block size disabled.\n"); 2362 } else { 2363 STm->default_blksize = value; 2364 DEBC_printk(STp,"Default block size set to " 2365 "%d bytes.\n", STm->default_blksize); 2366 if (STp->ready == ST_READY) { 2367 STp->blksize_changed = 0; 2368 set_mode_densblk(STp, STm); 2369 } 2370 } 2371 } else if (code == MT_ST_TIMEOUTS) { 2372 value = (options & ~MT_ST_OPTIONS); 2373 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2374 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2375 DEBC_printk(STp, "Long timeout set to %d seconds.\n", 2376 (value & ~MT_ST_SET_LONG_TIMEOUT)); 2377 } else { 2378 blk_queue_rq_timeout(STp->device->request_queue, 2379 value * HZ); 2380 DEBC_printk(STp, "Normal timeout set to %d seconds.\n", 2381 value); 2382 } 2383 } else if (code == MT_ST_SET_CLN) { 2384 value = (options & ~MT_ST_OPTIONS) & 0xff; 2385 if (value != 0 && 2386 (value < EXTENDED_SENSE_START || 2387 value >= SCSI_SENSE_BUFFERSIZE)) 2388 return (-EINVAL); 2389 STp->cln_mode = value; 2390 STp->cln_sense_mask = (options >> 8) & 0xff; 2391 STp->cln_sense_value = (options >> 16) & 0xff; 2392 st_printk(KERN_INFO, STp, 2393 "Cleaning request mode %d, mask %02x, value %02x\n", 2394 value, STp->cln_sense_mask, STp->cln_sense_value); 2395 } else if (code == MT_ST_DEF_OPTIONS) { 2396 code = (options & ~MT_ST_CLEAR_DEFAULT); 2397 value = (options & MT_ST_CLEAR_DEFAULT); 2398 if (code == MT_ST_DEF_DENSITY) { 2399 if (value == MT_ST_CLEAR_DEFAULT) { 2400 STm->default_density = (-1); 2401 DEBC_printk(STp, 2402 "Density default disabled.\n"); 2403 } else { 2404 STm->default_density = value & 0xff; 2405 DEBC_printk(STp, "Density default set to %x\n", 2406 STm->default_density); 2407 if (STp->ready == ST_READY) { 2408 STp->density_changed = 0; 2409 set_mode_densblk(STp, STm); 2410 } 2411 } 2412 } else if (code == MT_ST_DEF_DRVBUFFER) { 2413 if (value == MT_ST_CLEAR_DEFAULT) { 2414 STp->default_drvbuffer = 0xff; 2415 DEBC_printk(STp, 2416 "Drive buffer default disabled.\n"); 2417 } else { 2418 STp->default_drvbuffer = value & 7; 2419 DEBC_printk(STp, 2420 "Drive buffer default set to %x\n", 2421 STp->default_drvbuffer); 2422 if (STp->ready == ST_READY) 2423 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2424 } 2425 } else if (code == MT_ST_DEF_COMPRESSION) { 2426 if (value == MT_ST_CLEAR_DEFAULT) { 2427 STm->default_compression = ST_DONT_TOUCH; 2428 DEBC_printk(STp, 2429 "Compression default disabled.\n"); 2430 } else { 2431 if ((value & 0xff00) != 0) { 2432 STp->c_algo = (value & 0xff00) >> 8; 2433 DEBC_printk(STp, "Compression " 2434 "algorithm set to 0x%x.\n", 2435 STp->c_algo); 2436 } 2437 if ((value & 0xff) != 0xff) { 2438 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2439 DEBC_printk(STp, "Compression default " 2440 "set to %x\n", 2441 (value & 1)); 2442 if (STp->ready == ST_READY) { 2443 STp->compression_changed = 0; 2444 st_compression(STp, (STm->default_compression == ST_YES)); 2445 } 2446 } 2447 } 2448 } 2449 } else 2450 return (-EIO); 2451 2452 return 0; 2453 } 2454 2455 #define MODE_HEADER_LENGTH 4 2456 2457 /* Mode header and page byte offsets */ 2458 #define MH_OFF_DATA_LENGTH 0 2459 #define MH_OFF_MEDIUM_TYPE 1 2460 #define MH_OFF_DEV_SPECIFIC 2 2461 #define MH_OFF_BDESCS_LENGTH 3 2462 #define MP_OFF_PAGE_NBR 0 2463 #define MP_OFF_PAGE_LENGTH 1 2464 2465 /* Mode header and page bit masks */ 2466 #define MH_BIT_WP 0x80 2467 #define MP_MSK_PAGE_NBR 0x3f 2468 2469 /* Don't return block descriptors */ 2470 #define MODE_SENSE_OMIT_BDESCS 0x08 2471 2472 #define MODE_SELECT_PAGE_FORMAT 0x10 2473 2474 /* Read a mode page into the tape buffer. The block descriptors are included 2475 if incl_block_descs is true. The page control is ored to the page number 2476 parameter, if necessary. */ 2477 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2478 { 2479 unsigned char cmd[MAX_COMMAND_SIZE]; 2480 struct st_request *SRpnt; 2481 2482 memset(cmd, 0, MAX_COMMAND_SIZE); 2483 cmd[0] = MODE_SENSE; 2484 if (omit_block_descs) 2485 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2486 cmd[2] = page; 2487 cmd[4] = 255; 2488 2489 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2490 STp->device->request_queue->rq_timeout, 0, 1); 2491 if (SRpnt == NULL) 2492 return (STp->buffer)->syscall_result; 2493 2494 st_release_request(SRpnt); 2495 2496 return STp->buffer->syscall_result; 2497 } 2498 2499 2500 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2501 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2502 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2503 { 2504 int pgo; 2505 unsigned char cmd[MAX_COMMAND_SIZE]; 2506 struct st_request *SRpnt; 2507 int timeout; 2508 2509 memset(cmd, 0, MAX_COMMAND_SIZE); 2510 cmd[0] = MODE_SELECT; 2511 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2512 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2513 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2514 2515 /* Clear reserved fields */ 2516 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2517 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2518 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2519 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2520 2521 timeout = slow ? 2522 STp->long_timeout : STp->device->request_queue->rq_timeout; 2523 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2524 timeout, 0, 1); 2525 if (SRpnt == NULL) 2526 return (STp->buffer)->syscall_result; 2527 2528 st_release_request(SRpnt); 2529 2530 return STp->buffer->syscall_result; 2531 } 2532 2533 2534 #define COMPRESSION_PAGE 0x0f 2535 #define COMPRESSION_PAGE_LENGTH 16 2536 2537 #define CP_OFF_DCE_DCC 2 2538 #define CP_OFF_C_ALGO 7 2539 2540 #define DCE_MASK 0x80 2541 #define DCC_MASK 0x40 2542 #define RED_MASK 0x60 2543 2544 2545 /* Control the compression with mode page 15. Algorithm not changed if zero. 2546 2547 The block descriptors are read and written because Sony SDT-7000 does not 2548 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2549 Including block descriptors should not cause any harm to other drives. */ 2550 2551 static int st_compression(struct scsi_tape * STp, int state) 2552 { 2553 int retval; 2554 int mpoffs; /* Offset to mode page start */ 2555 unsigned char *b_data = (STp->buffer)->b_data; 2556 2557 if (STp->ready != ST_READY) 2558 return (-EIO); 2559 2560 /* Read the current page contents */ 2561 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2562 if (retval) { 2563 DEBC_printk(STp, "Compression mode page not supported.\n"); 2564 return (-EIO); 2565 } 2566 2567 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2568 DEBC_printk(STp, "Compression state is %d.\n", 2569 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); 2570 2571 /* Check if compression can be changed */ 2572 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2573 DEBC_printk(STp, "Compression not supported.\n"); 2574 return (-EIO); 2575 } 2576 2577 /* Do the change */ 2578 if (state) { 2579 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2580 if (STp->c_algo != 0) 2581 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2582 } 2583 else { 2584 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2585 if (STp->c_algo != 0) 2586 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2587 } 2588 2589 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2590 if (retval) { 2591 DEBC_printk(STp, "Compression change failed.\n"); 2592 return (-EIO); 2593 } 2594 DEBC_printk(STp, "Compression state changed to %d.\n", state); 2595 2596 STp->compression_changed = 1; 2597 return 0; 2598 } 2599 2600 2601 /* Process the load and unload commands (does unload if the load code is zero) */ 2602 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2603 { 2604 int retval = (-EIO), timeout; 2605 unsigned char cmd[MAX_COMMAND_SIZE]; 2606 struct st_partstat *STps; 2607 struct st_request *SRpnt; 2608 2609 if (STp->ready != ST_READY && !load_code) { 2610 if (STp->ready == ST_NO_TAPE) 2611 return (-ENOMEDIUM); 2612 else 2613 return (-EIO); 2614 } 2615 2616 memset(cmd, 0, MAX_COMMAND_SIZE); 2617 cmd[0] = START_STOP; 2618 if (load_code) 2619 cmd[4] |= 1; 2620 /* 2621 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2622 */ 2623 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2624 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2625 DEBC_printk(STp, " Enhanced %sload slot %2d.\n", 2626 (cmd[4]) ? "" : "un", 2627 load_code - MT_ST_HPLOADER_OFFSET); 2628 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2629 } 2630 if (STp->immediate) { 2631 cmd[1] = 1; /* Don't wait for completion */ 2632 timeout = STp->device->request_queue->rq_timeout; 2633 } 2634 else 2635 timeout = STp->long_timeout; 2636 2637 DEBC( 2638 if (!load_code) 2639 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); 2640 else 2641 st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); 2642 ); 2643 2644 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2645 timeout, MAX_RETRIES, 1); 2646 if (!SRpnt) 2647 return (STp->buffer)->syscall_result; 2648 2649 retval = (STp->buffer)->syscall_result; 2650 st_release_request(SRpnt); 2651 2652 if (!retval) { /* SCSI command successful */ 2653 2654 if (!load_code) { 2655 STp->rew_at_close = 0; 2656 STp->ready = ST_NO_TAPE; 2657 } 2658 else { 2659 STp->rew_at_close = STp->autorew_dev; 2660 retval = check_tape(STp, filp); 2661 if (retval > 0) 2662 retval = 0; 2663 } 2664 } 2665 else { 2666 STps = &(STp->ps[STp->partition]); 2667 STps->drv_file = STps->drv_block = (-1); 2668 } 2669 2670 return retval; 2671 } 2672 2673 #if DEBUG 2674 #define ST_DEB_FORWARD 0 2675 #define ST_DEB_BACKWARD 1 2676 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) 2677 { 2678 s32 sc; 2679 2680 if (!debugging) 2681 return; 2682 2683 sc = cmd[2] & 0x80 ? 0xff000000 : 0; 2684 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; 2685 if (direction) 2686 sc = -sc; 2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2688 direction ? "backward" : "forward", sc, units); 2689 } 2690 #else 2691 #define ST_DEB_FORWARD 0 2692 #define ST_DEB_BACKWARD 1 2693 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2694 #endif 2695 2696 2697 /* Internal ioctl function */ 2698 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2699 { 2700 int timeout; 2701 long ltmp; 2702 int ioctl_result; 2703 int chg_eof = 1; 2704 unsigned char cmd[MAX_COMMAND_SIZE]; 2705 struct st_request *SRpnt; 2706 struct st_partstat *STps; 2707 int fileno, blkno, at_sm, undone; 2708 int datalen = 0, direction = DMA_NONE; 2709 2710 WARN_ON(STp->buffer->do_dio != 0); 2711 if (STp->ready != ST_READY) { 2712 if (STp->ready == ST_NO_TAPE) 2713 return (-ENOMEDIUM); 2714 else 2715 return (-EIO); 2716 } 2717 timeout = STp->long_timeout; 2718 STps = &(STp->ps[STp->partition]); 2719 fileno = STps->drv_file; 2720 blkno = STps->drv_block; 2721 at_sm = STps->at_sm; 2722 2723 memset(cmd, 0, MAX_COMMAND_SIZE); 2724 switch (cmd_in) { 2725 case MTFSFM: 2726 chg_eof = 0; /* Changed from the FSF after this */ 2727 case MTFSF: 2728 cmd[0] = SPACE; 2729 cmd[1] = 0x01; /* Space FileMarks */ 2730 cmd[2] = (arg >> 16); 2731 cmd[3] = (arg >> 8); 2732 cmd[4] = arg; 2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2734 if (fileno >= 0) 2735 fileno += arg; 2736 blkno = 0; 2737 at_sm &= (arg == 0); 2738 break; 2739 case MTBSFM: 2740 chg_eof = 0; /* Changed from the FSF after this */ 2741 case MTBSF: 2742 cmd[0] = SPACE; 2743 cmd[1] = 0x01; /* Space FileMarks */ 2744 ltmp = (-arg); 2745 cmd[2] = (ltmp >> 16); 2746 cmd[3] = (ltmp >> 8); 2747 cmd[4] = ltmp; 2748 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2749 if (fileno >= 0) 2750 fileno -= arg; 2751 blkno = (-1); /* We can't know the block number */ 2752 at_sm &= (arg == 0); 2753 break; 2754 case MTFSR: 2755 cmd[0] = SPACE; 2756 cmd[1] = 0x00; /* Space Blocks */ 2757 cmd[2] = (arg >> 16); 2758 cmd[3] = (arg >> 8); 2759 cmd[4] = arg; 2760 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2761 if (blkno >= 0) 2762 blkno += arg; 2763 at_sm &= (arg == 0); 2764 break; 2765 case MTBSR: 2766 cmd[0] = SPACE; 2767 cmd[1] = 0x00; /* Space Blocks */ 2768 ltmp = (-arg); 2769 cmd[2] = (ltmp >> 16); 2770 cmd[3] = (ltmp >> 8); 2771 cmd[4] = ltmp; 2772 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2773 if (blkno >= 0) 2774 blkno -= arg; 2775 at_sm &= (arg == 0); 2776 break; 2777 case MTFSS: 2778 cmd[0] = SPACE; 2779 cmd[1] = 0x04; /* Space Setmarks */ 2780 cmd[2] = (arg >> 16); 2781 cmd[3] = (arg >> 8); 2782 cmd[4] = arg; 2783 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2784 if (arg != 0) { 2785 blkno = fileno = (-1); 2786 at_sm = 1; 2787 } 2788 break; 2789 case MTBSS: 2790 cmd[0] = SPACE; 2791 cmd[1] = 0x04; /* Space Setmarks */ 2792 ltmp = (-arg); 2793 cmd[2] = (ltmp >> 16); 2794 cmd[3] = (ltmp >> 8); 2795 cmd[4] = ltmp; 2796 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2797 if (arg != 0) { 2798 blkno = fileno = (-1); 2799 at_sm = 1; 2800 } 2801 break; 2802 case MTWEOF: 2803 case MTWEOFI: 2804 case MTWSM: 2805 if (STp->write_prot) 2806 return (-EACCES); 2807 cmd[0] = WRITE_FILEMARKS; 2808 if (cmd_in == MTWSM) 2809 cmd[1] = 2; 2810 if (cmd_in == MTWEOFI || 2811 (cmd_in == MTWEOF && STp->immediate_filemark)) 2812 cmd[1] |= 1; 2813 cmd[2] = (arg >> 16); 2814 cmd[3] = (arg >> 8); 2815 cmd[4] = arg; 2816 timeout = STp->device->request_queue->rq_timeout; 2817 DEBC( 2818 if (cmd_in != MTWSM) 2819 st_printk(ST_DEB_MSG, STp, 2820 "Writing %d filemarks.\n", 2821 cmd[2] * 65536 + 2822 cmd[3] * 256 + 2823 cmd[4]); 2824 else 2825 st_printk(ST_DEB_MSG, STp, 2826 "Writing %d setmarks.\n", 2827 cmd[2] * 65536 + 2828 cmd[3] * 256 + 2829 cmd[4]); 2830 ) 2831 if (fileno >= 0) 2832 fileno += arg; 2833 blkno = 0; 2834 at_sm = (cmd_in == MTWSM); 2835 break; 2836 case MTREW: 2837 cmd[0] = REZERO_UNIT; 2838 if (STp->immediate) { 2839 cmd[1] = 1; /* Don't wait for completion */ 2840 timeout = STp->device->request_queue->rq_timeout; 2841 } 2842 DEBC_printk(STp, "Rewinding tape.\n"); 2843 fileno = blkno = at_sm = 0; 2844 break; 2845 case MTNOP: 2846 DEBC_printk(STp, "No op on tape.\n"); 2847 return 0; /* Should do something ? */ 2848 break; 2849 case MTRETEN: 2850 cmd[0] = START_STOP; 2851 if (STp->immediate) { 2852 cmd[1] = 1; /* Don't wait for completion */ 2853 timeout = STp->device->request_queue->rq_timeout; 2854 } 2855 cmd[4] = 3; 2856 DEBC_printk(STp, "Retensioning tape.\n"); 2857 fileno = blkno = at_sm = 0; 2858 break; 2859 case MTEOM: 2860 if (!STp->fast_mteom) { 2861 /* space to the end of tape */ 2862 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2863 fileno = STps->drv_file; 2864 if (STps->eof >= ST_EOD_1) 2865 return 0; 2866 /* The next lines would hide the number of spaced FileMarks 2867 That's why I inserted the previous lines. I had no luck 2868 with detecting EOM with FSF, so we go now to EOM. 2869 Joerg Weule */ 2870 } else 2871 fileno = (-1); 2872 cmd[0] = SPACE; 2873 cmd[1] = 3; 2874 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2875 blkno = -1; 2876 at_sm = 0; 2877 break; 2878 case MTERASE: 2879 if (STp->write_prot) 2880 return (-EACCES); 2881 cmd[0] = ERASE; 2882 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2883 if (STp->immediate) { 2884 cmd[1] |= 2; /* Don't wait for completion */ 2885 timeout = STp->device->request_queue->rq_timeout; 2886 } 2887 else 2888 timeout = STp->long_timeout * 8; 2889 2890 DEBC_printk(STp, "Erasing tape.\n"); 2891 fileno = blkno = at_sm = 0; 2892 break; 2893 case MTSETBLK: /* Set block length */ 2894 case MTSETDENSITY: /* Set tape density */ 2895 case MTSETDRVBUFFER: /* Set drive buffering */ 2896 case SET_DENS_AND_BLK: /* Set density and block size */ 2897 chg_eof = 0; 2898 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2899 return (-EIO); /* Not allowed if data in buffer */ 2900 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2901 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2902 STp->max_block > 0 && 2903 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2904 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2905 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2906 return (-EINVAL); 2907 } 2908 cmd[0] = MODE_SELECT; 2909 if ((STp->use_pf & USE_PF)) 2910 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2911 cmd[4] = datalen = 12; 2912 direction = DMA_TO_DEVICE; 2913 2914 memset((STp->buffer)->b_data, 0, 12); 2915 if (cmd_in == MTSETDRVBUFFER) 2916 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2917 else 2918 (STp->buffer)->b_data[2] = 2919 STp->drv_buffer << 4; 2920 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2921 if (cmd_in == MTSETDENSITY) { 2922 (STp->buffer)->b_data[4] = arg; 2923 STp->density_changed = 1; /* At least we tried ;-) */ 2924 } else if (cmd_in == SET_DENS_AND_BLK) 2925 (STp->buffer)->b_data[4] = arg >> 24; 2926 else 2927 (STp->buffer)->b_data[4] = STp->density; 2928 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2929 ltmp = arg & MT_ST_BLKSIZE_MASK; 2930 if (cmd_in == MTSETBLK) 2931 STp->blksize_changed = 1; /* At least we tried ;-) */ 2932 } else 2933 ltmp = STp->block_size; 2934 (STp->buffer)->b_data[9] = (ltmp >> 16); 2935 (STp->buffer)->b_data[10] = (ltmp >> 8); 2936 (STp->buffer)->b_data[11] = ltmp; 2937 timeout = STp->device->request_queue->rq_timeout; 2938 DEBC( 2939 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2940 st_printk(ST_DEB_MSG, STp, 2941 "Setting block size to %d bytes.\n", 2942 (STp->buffer)->b_data[9] * 65536 + 2943 (STp->buffer)->b_data[10] * 256 + 2944 (STp->buffer)->b_data[11]); 2945 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2946 st_printk(ST_DEB_MSG, STp, 2947 "Setting density code to %x.\n", 2948 (STp->buffer)->b_data[4]); 2949 if (cmd_in == MTSETDRVBUFFER) 2950 st_printk(ST_DEB_MSG, STp, 2951 "Setting drive buffer code to %d.\n", 2952 ((STp->buffer)->b_data[2] >> 4) & 7); 2953 ) 2954 break; 2955 default: 2956 return (-ENOSYS); 2957 } 2958 2959 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2960 timeout, MAX_RETRIES, 1); 2961 if (!SRpnt) 2962 return (STp->buffer)->syscall_result; 2963 2964 ioctl_result = (STp->buffer)->syscall_result; 2965 2966 if (!ioctl_result) { /* SCSI command successful */ 2967 st_release_request(SRpnt); 2968 SRpnt = NULL; 2969 STps->drv_block = blkno; 2970 STps->drv_file = fileno; 2971 STps->at_sm = at_sm; 2972 2973 if (cmd_in == MTBSFM) 2974 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2975 else if (cmd_in == MTFSFM) 2976 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2977 2978 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2979 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2980 if (STp->block_size != 0) { 2981 (STp->buffer)->buffer_blocks = 2982 (STp->buffer)->buffer_size / STp->block_size; 2983 } 2984 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2985 if (cmd_in == SET_DENS_AND_BLK) 2986 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2987 } else if (cmd_in == MTSETDRVBUFFER) 2988 STp->drv_buffer = (arg & 7); 2989 else if (cmd_in == MTSETDENSITY) 2990 STp->density = arg; 2991 2992 if (cmd_in == MTEOM) 2993 STps->eof = ST_EOD; 2994 else if (cmd_in == MTFSF) 2995 STps->eof = ST_FM; 2996 else if (chg_eof) 2997 STps->eof = ST_NOEOF; 2998 2999 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3000 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3001 } else { /* SCSI command was not completely successful. Don't return 3002 from this block without releasing the SCSI command block! */ 3003 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3004 3005 if (cmdstatp->flags & SENSE_EOM) { 3006 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3007 cmd_in != MTBSR && cmd_in != MTBSS) 3008 STps->eof = ST_EOM_OK; 3009 STps->drv_block = 0; 3010 } 3011 3012 if (cmdstatp->remainder_valid) 3013 undone = (int)cmdstatp->uremainder64; 3014 else 3015 undone = 0; 3016 3017 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3018 cmdstatp->have_sense && 3019 (cmdstatp->flags & SENSE_EOM)) { 3020 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3021 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3022 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3023 STps->eof = ST_NOEOF; 3024 } else { /* Writing EOF(s) failed */ 3025 if (fileno >= 0) 3026 fileno -= undone; 3027 if (undone < arg) 3028 STps->eof = ST_NOEOF; 3029 } 3030 STps->drv_file = fileno; 3031 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3032 if (fileno >= 0) 3033 STps->drv_file = fileno - undone; 3034 else 3035 STps->drv_file = fileno; 3036 STps->drv_block = -1; 3037 STps->eof = ST_NOEOF; 3038 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3039 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3040 undone = (-undone); 3041 if (STps->drv_file >= 0) 3042 STps->drv_file = fileno + undone; 3043 STps->drv_block = 0; 3044 STps->eof = ST_NOEOF; 3045 } else if (cmd_in == MTFSR) { 3046 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3047 if (STps->drv_file >= 0) 3048 STps->drv_file++; 3049 STps->drv_block = 0; 3050 STps->eof = ST_FM; 3051 } else { 3052 if (blkno >= undone) 3053 STps->drv_block = blkno - undone; 3054 else 3055 STps->drv_block = (-1); 3056 STps->eof = ST_NOEOF; 3057 } 3058 } else if (cmd_in == MTBSR) { 3059 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3060 STps->drv_file--; 3061 STps->drv_block = (-1); 3062 } else { 3063 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3064 undone = (-undone); 3065 if (STps->drv_block >= 0) 3066 STps->drv_block = blkno + undone; 3067 } 3068 STps->eof = ST_NOEOF; 3069 } else if (cmd_in == MTEOM) { 3070 STps->drv_file = (-1); 3071 STps->drv_block = (-1); 3072 STps->eof = ST_EOD; 3073 } else if (cmd_in == MTSETBLK || 3074 cmd_in == MTSETDENSITY || 3075 cmd_in == MTSETDRVBUFFER || 3076 cmd_in == SET_DENS_AND_BLK) { 3077 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3078 !(STp->use_pf & PF_TESTED)) { 3079 /* Try the other possible state of Page Format if not 3080 already tried */ 3081 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3082 st_release_request(SRpnt); 3083 SRpnt = NULL; 3084 return st_int_ioctl(STp, cmd_in, arg); 3085 } 3086 } else if (chg_eof) 3087 STps->eof = ST_NOEOF; 3088 3089 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3090 STps->eof = ST_EOD; 3091 3092 st_release_request(SRpnt); 3093 SRpnt = NULL; 3094 } 3095 3096 return ioctl_result; 3097 } 3098 3099 3100 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3101 structure. */ 3102 3103 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3104 int logical) 3105 { 3106 int result; 3107 unsigned char scmd[MAX_COMMAND_SIZE]; 3108 struct st_request *SRpnt; 3109 3110 if (STp->ready != ST_READY) 3111 return (-EIO); 3112 3113 memset(scmd, 0, MAX_COMMAND_SIZE); 3114 if ((STp->device)->scsi_level < SCSI_2) { 3115 scmd[0] = QFA_REQUEST_BLOCK; 3116 scmd[4] = 3; 3117 } else { 3118 scmd[0] = READ_POSITION; 3119 if (!logical && !STp->scsi2_logical) 3120 scmd[1] = 1; 3121 } 3122 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3123 STp->device->request_queue->rq_timeout, 3124 MAX_READY_RETRIES, 1); 3125 if (!SRpnt) 3126 return (STp->buffer)->syscall_result; 3127 3128 if ((STp->buffer)->syscall_result != 0 || 3129 (STp->device->scsi_level >= SCSI_2 && 3130 ((STp->buffer)->b_data[0] & 4) != 0)) { 3131 *block = *partition = 0; 3132 DEBC_printk(STp, " Can't read tape position.\n"); 3133 result = (-EIO); 3134 } else { 3135 result = 0; 3136 if ((STp->device)->scsi_level < SCSI_2) { 3137 *block = ((STp->buffer)->b_data[0] << 16) 3138 + ((STp->buffer)->b_data[1] << 8) 3139 + (STp->buffer)->b_data[2]; 3140 *partition = 0; 3141 } else { 3142 *block = ((STp->buffer)->b_data[4] << 24) 3143 + ((STp->buffer)->b_data[5] << 16) 3144 + ((STp->buffer)->b_data[6] << 8) 3145 + (STp->buffer)->b_data[7]; 3146 *partition = (STp->buffer)->b_data[1]; 3147 if (((STp->buffer)->b_data[0] & 0x80) && 3148 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3149 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3150 } 3151 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3152 *block, *partition); 3153 } 3154 st_release_request(SRpnt); 3155 SRpnt = NULL; 3156 3157 return result; 3158 } 3159 3160 3161 /* Set the tape block and partition. Negative partition means that only the 3162 block should be set in vendor specific way. */ 3163 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3164 int logical) 3165 { 3166 struct st_partstat *STps; 3167 int result, p; 3168 unsigned int blk; 3169 int timeout; 3170 unsigned char scmd[MAX_COMMAND_SIZE]; 3171 struct st_request *SRpnt; 3172 3173 if (STp->ready != ST_READY) 3174 return (-EIO); 3175 timeout = STp->long_timeout; 3176 STps = &(STp->ps[STp->partition]); 3177 3178 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3179 block, partition); 3180 DEB(if (partition < 0) 3181 return (-EIO); ) 3182 3183 /* Update the location at the partition we are leaving */ 3184 if ((!STp->can_partitions && partition != 0) || 3185 partition >= ST_NBR_PARTITIONS) 3186 return (-EINVAL); 3187 if (partition != STp->partition) { 3188 if (get_location(STp, &blk, &p, 1)) 3189 STps->last_block_valid = 0; 3190 else { 3191 STps->last_block_valid = 1; 3192 STps->last_block_visited = blk; 3193 DEBC_printk(STp, "Visited block %d for " 3194 "partition %d saved.\n", 3195 blk, STp->partition); 3196 } 3197 } 3198 3199 memset(scmd, 0, MAX_COMMAND_SIZE); 3200 if ((STp->device)->scsi_level < SCSI_2) { 3201 scmd[0] = QFA_SEEK_BLOCK; 3202 scmd[2] = (block >> 16); 3203 scmd[3] = (block >> 8); 3204 scmd[4] = block; 3205 scmd[5] = 0; 3206 } else { 3207 scmd[0] = SEEK_10; 3208 scmd[3] = (block >> 24); 3209 scmd[4] = (block >> 16); 3210 scmd[5] = (block >> 8); 3211 scmd[6] = block; 3212 if (!logical && !STp->scsi2_logical) 3213 scmd[1] = 4; 3214 if (STp->partition != partition) { 3215 scmd[1] |= 2; 3216 scmd[8] = partition; 3217 DEBC_printk(STp, "Trying to change partition " 3218 "from %d to %d\n", STp->partition, 3219 partition); 3220 } 3221 } 3222 if (STp->immediate) { 3223 scmd[1] |= 1; /* Don't wait for completion */ 3224 timeout = STp->device->request_queue->rq_timeout; 3225 } 3226 3227 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3228 timeout, MAX_READY_RETRIES, 1); 3229 if (!SRpnt) 3230 return (STp->buffer)->syscall_result; 3231 3232 STps->drv_block = STps->drv_file = (-1); 3233 STps->eof = ST_NOEOF; 3234 if ((STp->buffer)->syscall_result != 0) { 3235 result = (-EIO); 3236 if (STp->can_partitions && 3237 (STp->device)->scsi_level >= SCSI_2 && 3238 (p = find_partition(STp)) >= 0) 3239 STp->partition = p; 3240 } else { 3241 if (STp->can_partitions) { 3242 STp->partition = partition; 3243 STps = &(STp->ps[partition]); 3244 if (!STps->last_block_valid || 3245 STps->last_block_visited != block) { 3246 STps->at_sm = 0; 3247 STps->rw = ST_IDLE; 3248 } 3249 } else 3250 STps->at_sm = 0; 3251 if (block == 0) 3252 STps->drv_block = STps->drv_file = 0; 3253 result = 0; 3254 } 3255 3256 st_release_request(SRpnt); 3257 SRpnt = NULL; 3258 3259 return result; 3260 } 3261 3262 3263 /* Find the current partition number for the drive status. Called from open and 3264 returns either partition number of negative error code. */ 3265 static int find_partition(struct scsi_tape *STp) 3266 { 3267 int i, partition; 3268 unsigned int block; 3269 3270 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3271 return i; 3272 if (partition >= ST_NBR_PARTITIONS) 3273 return (-EIO); 3274 return partition; 3275 } 3276 3277 3278 /* Change the partition if necessary */ 3279 static int switch_partition(struct scsi_tape *STp) 3280 { 3281 struct st_partstat *STps; 3282 3283 if (STp->partition == STp->new_partition) 3284 return 0; 3285 STps = &(STp->ps[STp->new_partition]); 3286 if (!STps->last_block_valid) 3287 STps->last_block_visited = 0; 3288 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3289 } 3290 3291 /* Functions for reading and writing the medium partition mode page. */ 3292 3293 #define PART_PAGE 0x11 3294 #define PART_PAGE_FIXED_LENGTH 8 3295 3296 #define PP_OFF_MAX_ADD_PARTS 2 3297 #define PP_OFF_NBR_ADD_PARTS 3 3298 #define PP_OFF_FLAGS 4 3299 #define PP_OFF_PART_UNITS 6 3300 #define PP_OFF_RESERVED 7 3301 3302 #define PP_BIT_IDP 0x20 3303 #define PP_BIT_FDP 0x80 3304 #define PP_MSK_PSUM_MB 0x10 3305 #define PP_MSK_PSUM_UNITS 0x18 3306 #define PP_MSK_POFM 0x04 3307 3308 /* Get the number of partitions on the tape. As a side effect reads the 3309 mode page into the tape buffer. */ 3310 static int nbr_partitions(struct scsi_tape *STp) 3311 { 3312 int result; 3313 3314 if (STp->ready != ST_READY) 3315 return (-EIO); 3316 3317 result = read_mode_page(STp, PART_PAGE, 1); 3318 3319 if (result) { 3320 DEBC_printk(STp, "Can't read medium partition page.\n"); 3321 result = (-EIO); 3322 } else { 3323 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3324 PP_OFF_NBR_ADD_PARTS] + 1; 3325 DEBC_printk(STp, "Number of partitions %d.\n", result); 3326 } 3327 3328 return result; 3329 } 3330 3331 3332 static int format_medium(struct scsi_tape *STp, int format) 3333 { 3334 int result = 0; 3335 int timeout = STp->long_timeout; 3336 unsigned char scmd[MAX_COMMAND_SIZE]; 3337 struct st_request *SRpnt; 3338 3339 memset(scmd, 0, MAX_COMMAND_SIZE); 3340 scmd[0] = FORMAT_UNIT; 3341 scmd[2] = format; 3342 if (STp->immediate) { 3343 scmd[1] |= 1; /* Don't wait for completion */ 3344 timeout = STp->device->request_queue->rq_timeout; 3345 } 3346 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3347 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3348 timeout, MAX_RETRIES, 1); 3349 if (!SRpnt) 3350 result = STp->buffer->syscall_result; 3351 return result; 3352 } 3353 3354 3355 /* Partition the tape into two partitions if size > 0 or one partition if 3356 size == 0. 3357 3358 The block descriptors are read and written because Sony SDT-7000 does not 3359 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3360 3361 My HP C1533A drive returns only one partition size field. This is used to 3362 set the size of partition 1. There is no size field for the default partition. 3363 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3364 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3365 The following algorithm is used to accommodate both drives: if the number of 3366 partition size fields is greater than the maximum number of additional partitions 3367 in the mode page, the second field is used. Otherwise the first field is used. 3368 3369 For Seagate DDS drives the page length must be 8 when no partitions is defined 3370 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3371 is acceptable also to some other old drives and enforced if the first partition 3372 size field is used for the first additional partition size. 3373 3374 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3375 */ 3376 static int partition_tape(struct scsi_tape *STp, int size) 3377 { 3378 int result; 3379 int target_partition; 3380 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3381 int pgo, psd_cnt, psdo; 3382 int psum = PP_MSK_PSUM_MB, units = 0; 3383 unsigned char *bp; 3384 3385 result = read_mode_page(STp, PART_PAGE, 0); 3386 if (result) { 3387 DEBC_printk(STp, "Can't read partition mode page.\n"); 3388 return result; 3389 } 3390 target_partition = 1; 3391 if (size < 0) { 3392 target_partition = 0; 3393 size = -size; 3394 } 3395 3396 /* The mode page is in the buffer. Let's modify it and write it. */ 3397 bp = (STp->buffer)->b_data; 3398 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3399 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3400 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3401 3402 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3403 3404 if (scsi3) { 3405 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3406 if (needs_format && size == 0) { 3407 /* No need to write the mode page when clearing 3408 * partitioning 3409 */ 3410 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3411 result = format_medium(STp, 0); 3412 goto out; 3413 } 3414 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3415 psd_cnt = 2; 3416 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3417 /* Use units scaling for large partitions if the device 3418 * suggests it and no precision lost. Required for IBM 3419 * TS1140/50 drives that don't support MB units. 3420 */ 3421 if (size >= 1000 && (size % 1000) == 0) { 3422 size /= 1000; 3423 psum = PP_MSK_PSUM_UNITS; 3424 units = 9; /* GB */ 3425 } 3426 } 3427 /* Try it anyway if too large to specify in MB */ 3428 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3429 size /= 1000; 3430 psum = PP_MSK_PSUM_UNITS; 3431 units = 9; /* GB */ 3432 } 3433 } 3434 3435 if (size >= 65535 || /* Does not fit into two bytes */ 3436 (target_partition == 0 && psd_cnt < 2)) { 3437 result = -EINVAL; 3438 goto out; 3439 } 3440 3441 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3442 /* The second condition is for HP DDS which use only one partition size 3443 * descriptor 3444 */ 3445 if (target_partition > 0 && 3446 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3447 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3448 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3449 psdo += 2; 3450 } 3451 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3452 3453 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3454 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3455 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3456 3457 if (size == 0) { 3458 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3459 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3460 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3461 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3462 } else { 3463 bp[psdo] = (size >> 8) & 0xff; 3464 bp[psdo + 1] = size & 0xff; 3465 if (target_partition == 0) 3466 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3467 bp[pgo + 3] = 1; 3468 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3469 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3470 DEBC_printk(STp, 3471 "Formatting tape with two partitions (%i = %d MB).\n", 3472 target_partition, units > 0 ? size * 1000 : size); 3473 } 3474 bp[pgo + PP_OFF_PART_UNITS] = 0; 3475 bp[pgo + PP_OFF_RESERVED] = 0; 3476 if (size != 1 || units != 0) { 3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3478 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3479 bp[pgo + PP_OFF_PART_UNITS] = units; 3480 } else 3481 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3482 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3483 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3484 3485 result = write_mode_page(STp, PART_PAGE, 1); 3486 3487 if (!result && needs_format) 3488 result = format_medium(STp, 1); 3489 3490 if (result) { 3491 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3492 result = (-EIO); 3493 } 3494 3495 out: 3496 return result; 3497 } 3498 3499 3500 3501 /* The ioctl command */ 3502 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3503 { 3504 int i, cmd_nr, cmd_type, bt; 3505 int retval = 0; 3506 unsigned int blk; 3507 struct scsi_tape *STp = file->private_data; 3508 struct st_modedef *STm; 3509 struct st_partstat *STps; 3510 void __user *p = (void __user *)arg; 3511 3512 if (mutex_lock_interruptible(&STp->lock)) 3513 return -ERESTARTSYS; 3514 3515 DEB( 3516 if (debugging && !STp->in_use) { 3517 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3518 retval = (-EIO); 3519 goto out; 3520 } ) /* end DEB */ 3521 3522 STm = &(STp->modes[STp->current_mode]); 3523 STps = &(STp->ps[STp->partition]); 3524 3525 /* 3526 * If we are in the middle of error recovery, don't let anyone 3527 * else try and use this device. Also, if error recovery fails, it 3528 * may try and take the device offline, in which case all further 3529 * access to the device is prohibited. 3530 */ 3531 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3532 file->f_flags & O_NDELAY); 3533 if (retval) 3534 goto out; 3535 3536 cmd_type = _IOC_TYPE(cmd_in); 3537 cmd_nr = _IOC_NR(cmd_in); 3538 3539 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3540 struct mtop mtc; 3541 3542 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3543 retval = (-EINVAL); 3544 goto out; 3545 } 3546 3547 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3548 if (i) { 3549 retval = (-EFAULT); 3550 goto out; 3551 } 3552 3553 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3554 st_printk(KERN_WARNING, STp, 3555 "MTSETDRVBUFFER only allowed for root.\n"); 3556 retval = (-EPERM); 3557 goto out; 3558 } 3559 if (!STm->defined && 3560 (mtc.mt_op != MTSETDRVBUFFER && 3561 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3562 retval = (-ENXIO); 3563 goto out; 3564 } 3565 3566 if (!STp->pos_unknown) { 3567 3568 if (STps->eof == ST_FM_HIT) { 3569 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3570 mtc.mt_op == MTEOM) { 3571 mtc.mt_count -= 1; 3572 if (STps->drv_file >= 0) 3573 STps->drv_file += 1; 3574 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3575 mtc.mt_count += 1; 3576 if (STps->drv_file >= 0) 3577 STps->drv_file += 1; 3578 } 3579 } 3580 3581 if (mtc.mt_op == MTSEEK) { 3582 /* Old position must be restored if partition will be 3583 changed */ 3584 i = !STp->can_partitions || 3585 (STp->new_partition != STp->partition); 3586 } else { 3587 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3588 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3589 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3590 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3591 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3592 mtc.mt_op == MTCOMPRESSION; 3593 } 3594 i = flush_buffer(STp, i); 3595 if (i < 0) { 3596 retval = i; 3597 goto out; 3598 } 3599 if (STps->rw == ST_WRITING && 3600 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3601 mtc.mt_op == MTSEEK || 3602 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3603 i = st_int_ioctl(STp, MTWEOF, 1); 3604 if (i < 0) { 3605 retval = i; 3606 goto out; 3607 } 3608 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3609 mtc.mt_count++; 3610 STps->rw = ST_IDLE; 3611 } 3612 3613 } else { 3614 /* 3615 * If there was a bus reset, block further access 3616 * to this device. If the user wants to rewind the tape, 3617 * then reset the flag and allow access again. 3618 */ 3619 if (mtc.mt_op != MTREW && 3620 mtc.mt_op != MTOFFL && 3621 mtc.mt_op != MTRETEN && 3622 mtc.mt_op != MTERASE && 3623 mtc.mt_op != MTSEEK && 3624 mtc.mt_op != MTEOM) { 3625 retval = (-EIO); 3626 goto out; 3627 } 3628 reset_state(STp); 3629 /* remove this when the midlevel properly clears was_reset */ 3630 STp->device->was_reset = 0; 3631 } 3632 3633 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3634 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3635 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3636 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3637 3638 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3639 do_door_lock(STp, 0); /* Ignore result! */ 3640 3641 if (mtc.mt_op == MTSETDRVBUFFER && 3642 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3643 retval = st_set_options(STp, mtc.mt_count); 3644 goto out; 3645 } 3646 3647 if (mtc.mt_op == MTSETPART) { 3648 if (!STp->can_partitions || 3649 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3650 retval = (-EINVAL); 3651 goto out; 3652 } 3653 if (mtc.mt_count >= STp->nbr_partitions && 3654 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3655 retval = (-EIO); 3656 goto out; 3657 } 3658 if (mtc.mt_count >= STp->nbr_partitions) { 3659 retval = (-EINVAL); 3660 goto out; 3661 } 3662 STp->new_partition = mtc.mt_count; 3663 retval = 0; 3664 goto out; 3665 } 3666 3667 if (mtc.mt_op == MTMKPART) { 3668 if (!STp->can_partitions) { 3669 retval = (-EINVAL); 3670 goto out; 3671 } 3672 i = do_load_unload(STp, file, 1); 3673 if (i < 0) { 3674 retval = i; 3675 goto out; 3676 } 3677 i = partition_tape(STp, mtc.mt_count); 3678 if (i < 0) { 3679 retval = i; 3680 goto out; 3681 } 3682 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3683 STp->ps[i].rw = ST_IDLE; 3684 STp->ps[i].at_sm = 0; 3685 STp->ps[i].last_block_valid = 0; 3686 } 3687 STp->partition = STp->new_partition = 0; 3688 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3689 STps->drv_block = STps->drv_file = 0; 3690 retval = 0; 3691 goto out; 3692 } 3693 3694 if (mtc.mt_op == MTSEEK) { 3695 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3696 if (!STp->can_partitions) 3697 STp->ps[0].rw = ST_IDLE; 3698 retval = i; 3699 goto out; 3700 } 3701 3702 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3703 retval = do_load_unload(STp, file, 0); 3704 goto out; 3705 } 3706 3707 if (mtc.mt_op == MTLOAD) { 3708 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3709 goto out; 3710 } 3711 3712 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3713 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3714 goto out; 3715 } 3716 3717 if (STp->can_partitions && STp->ready == ST_READY && 3718 (i = switch_partition(STp)) < 0) { 3719 retval = i; 3720 goto out; 3721 } 3722 3723 if (mtc.mt_op == MTCOMPRESSION) 3724 retval = st_compression(STp, (mtc.mt_count & 1)); 3725 else 3726 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3727 goto out; 3728 } 3729 if (!STm->defined) { 3730 retval = (-ENXIO); 3731 goto out; 3732 } 3733 3734 if ((i = flush_buffer(STp, 0)) < 0) { 3735 retval = i; 3736 goto out; 3737 } 3738 if (STp->can_partitions && 3739 (i = switch_partition(STp)) < 0) { 3740 retval = i; 3741 goto out; 3742 } 3743 3744 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3745 struct mtget mt_status; 3746 3747 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3748 retval = (-EINVAL); 3749 goto out; 3750 } 3751 3752 mt_status.mt_type = STp->tape_type; 3753 mt_status.mt_dsreg = 3754 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3755 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3756 mt_status.mt_blkno = STps->drv_block; 3757 mt_status.mt_fileno = STps->drv_file; 3758 if (STp->block_size != 0) { 3759 if (STps->rw == ST_WRITING) 3760 mt_status.mt_blkno += 3761 (STp->buffer)->buffer_bytes / STp->block_size; 3762 else if (STps->rw == ST_READING) 3763 mt_status.mt_blkno -= 3764 ((STp->buffer)->buffer_bytes + 3765 STp->block_size - 1) / STp->block_size; 3766 } 3767 3768 mt_status.mt_gstat = 0; 3769 if (STp->drv_write_prot) 3770 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3771 if (mt_status.mt_blkno == 0) { 3772 if (mt_status.mt_fileno == 0) 3773 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3774 else 3775 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3776 } 3777 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3778 mt_status.mt_resid = STp->partition; 3779 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3780 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3781 else if (STps->eof >= ST_EOM_OK) 3782 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3783 if (STp->density == 1) 3784 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3785 else if (STp->density == 2) 3786 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3787 else if (STp->density == 3) 3788 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3789 if (STp->ready == ST_READY) 3790 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3791 if (STp->ready == ST_NO_TAPE) 3792 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3793 if (STps->at_sm) 3794 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3795 if (STm->do_async_writes || 3796 (STm->do_buffer_writes && STp->block_size != 0) || 3797 STp->drv_buffer != 0) 3798 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3799 if (STp->cleaning_req) 3800 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3801 3802 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3803 if (i) { 3804 retval = (-EFAULT); 3805 goto out; 3806 } 3807 3808 STp->recover_reg = 0; /* Clear after read */ 3809 retval = 0; 3810 goto out; 3811 } /* End of MTIOCGET */ 3812 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3813 struct mtpos mt_pos; 3814 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3815 retval = (-EINVAL); 3816 goto out; 3817 } 3818 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3819 retval = i; 3820 goto out; 3821 } 3822 mt_pos.mt_blkno = blk; 3823 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3824 if (i) 3825 retval = (-EFAULT); 3826 goto out; 3827 } 3828 mutex_unlock(&STp->lock); 3829 switch (cmd_in) { 3830 case SCSI_IOCTL_GET_IDLUN: 3831 case SCSI_IOCTL_GET_BUS_NUMBER: 3832 break; 3833 default: 3834 if ((cmd_in == SG_IO || 3835 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3836 cmd_in == CDROM_SEND_PACKET) && 3837 !capable(CAP_SYS_RAWIO)) 3838 i = -EPERM; 3839 else 3840 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3841 file->f_mode, cmd_in, p); 3842 if (i != -ENOTTY) 3843 return i; 3844 break; 3845 } 3846 retval = scsi_ioctl(STp->device, cmd_in, p); 3847 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3848 STp->rew_at_close = 0; 3849 STp->ready = ST_NO_TAPE; 3850 } 3851 return retval; 3852 3853 out: 3854 mutex_unlock(&STp->lock); 3855 return retval; 3856 } 3857 3858 #ifdef CONFIG_COMPAT 3859 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3860 { 3861 struct scsi_tape *STp = file->private_data; 3862 struct scsi_device *sdev = STp->device; 3863 int ret = -ENOIOCTLCMD; 3864 if (sdev->host->hostt->compat_ioctl) { 3865 3866 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3867 3868 } 3869 return ret; 3870 } 3871 #endif 3872 3873 3874 3875 /* Try to allocate a new tape buffer. Calling function must not hold 3876 dev_arr_lock. */ 3877 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3878 { 3879 struct st_buffer *tb; 3880 3881 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3882 if (!tb) { 3883 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3884 return NULL; 3885 } 3886 tb->frp_segs = 0; 3887 tb->use_sg = max_sg; 3888 tb->dma = need_dma; 3889 tb->buffer_size = 0; 3890 3891 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3892 GFP_KERNEL); 3893 if (!tb->reserved_pages) { 3894 kfree(tb); 3895 return NULL; 3896 } 3897 3898 return tb; 3899 } 3900 3901 3902 /* Try to allocate enough space in the tape buffer */ 3903 #define ST_MAX_ORDER 6 3904 3905 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3906 { 3907 int segs, max_segs, b_size, order, got; 3908 gfp_t priority; 3909 3910 if (new_size <= STbuffer->buffer_size) 3911 return 1; 3912 3913 if (STbuffer->buffer_size <= PAGE_SIZE) 3914 normalize_buffer(STbuffer); /* Avoid extra segment */ 3915 3916 max_segs = STbuffer->use_sg; 3917 3918 priority = GFP_KERNEL | __GFP_NOWARN; 3919 if (need_dma) 3920 priority |= GFP_DMA; 3921 3922 if (STbuffer->cleared) 3923 priority |= __GFP_ZERO; 3924 3925 if (STbuffer->frp_segs) { 3926 order = STbuffer->reserved_page_order; 3927 b_size = PAGE_SIZE << order; 3928 } else { 3929 for (b_size = PAGE_SIZE, order = 0; 3930 order < ST_MAX_ORDER && 3931 max_segs * (PAGE_SIZE << order) < new_size; 3932 order++, b_size *= 2) 3933 ; /* empty */ 3934 STbuffer->reserved_page_order = order; 3935 } 3936 if (max_segs * (PAGE_SIZE << order) < new_size) { 3937 if (order == ST_MAX_ORDER) 3938 return 0; 3939 normalize_buffer(STbuffer); 3940 return enlarge_buffer(STbuffer, new_size, need_dma); 3941 } 3942 3943 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3944 segs < max_segs && got < new_size;) { 3945 struct page *page; 3946 3947 page = alloc_pages(priority, order); 3948 if (!page) { 3949 DEB(STbuffer->buffer_size = got); 3950 normalize_buffer(STbuffer); 3951 return 0; 3952 } 3953 3954 STbuffer->frp_segs += 1; 3955 got += b_size; 3956 STbuffer->buffer_size = got; 3957 STbuffer->reserved_pages[segs] = page; 3958 segs++; 3959 } 3960 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3961 3962 return 1; 3963 } 3964 3965 3966 /* Make sure that no data from previous user is in the internal buffer */ 3967 static void clear_buffer(struct st_buffer * st_bp) 3968 { 3969 int i; 3970 3971 for (i=0; i < st_bp->frp_segs; i++) 3972 memset(page_address(st_bp->reserved_pages[i]), 0, 3973 PAGE_SIZE << st_bp->reserved_page_order); 3974 st_bp->cleared = 1; 3975 } 3976 3977 3978 /* Release the extra buffer */ 3979 static void normalize_buffer(struct st_buffer * STbuffer) 3980 { 3981 int i, order = STbuffer->reserved_page_order; 3982 3983 for (i = 0; i < STbuffer->frp_segs; i++) { 3984 __free_pages(STbuffer->reserved_pages[i], order); 3985 STbuffer->buffer_size -= (PAGE_SIZE << order); 3986 } 3987 STbuffer->frp_segs = 0; 3988 STbuffer->sg_segs = 0; 3989 STbuffer->reserved_page_order = 0; 3990 STbuffer->map_data.offset = 0; 3991 } 3992 3993 3994 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3995 negative error code. */ 3996 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3997 { 3998 int i, cnt, res, offset; 3999 int length = PAGE_SIZE << st_bp->reserved_page_order; 4000 4001 for (i = 0, offset = st_bp->buffer_bytes; 4002 i < st_bp->frp_segs && offset >= length; i++) 4003 offset -= length; 4004 if (i == st_bp->frp_segs) { /* Should never happen */ 4005 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4006 return (-EIO); 4007 } 4008 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4009 struct page *page = st_bp->reserved_pages[i]; 4010 cnt = length - offset < do_count ? length - offset : do_count; 4011 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4012 if (res) 4013 return (-EFAULT); 4014 do_count -= cnt; 4015 st_bp->buffer_bytes += cnt; 4016 ubp += cnt; 4017 offset = 0; 4018 } 4019 if (do_count) /* Should never happen */ 4020 return (-EIO); 4021 4022 return 0; 4023 } 4024 4025 4026 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4027 negative error code. */ 4028 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4029 { 4030 int i, cnt, res, offset; 4031 int length = PAGE_SIZE << st_bp->reserved_page_order; 4032 4033 for (i = 0, offset = st_bp->read_pointer; 4034 i < st_bp->frp_segs && offset >= length; i++) 4035 offset -= length; 4036 if (i == st_bp->frp_segs) { /* Should never happen */ 4037 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4038 return (-EIO); 4039 } 4040 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4041 struct page *page = st_bp->reserved_pages[i]; 4042 cnt = length - offset < do_count ? length - offset : do_count; 4043 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4044 if (res) 4045 return (-EFAULT); 4046 do_count -= cnt; 4047 st_bp->buffer_bytes -= cnt; 4048 st_bp->read_pointer += cnt; 4049 ubp += cnt; 4050 offset = 0; 4051 } 4052 if (do_count) /* Should never happen */ 4053 return (-EIO); 4054 4055 return 0; 4056 } 4057 4058 4059 /* Move data towards start of buffer */ 4060 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4061 { 4062 int src_seg, dst_seg, src_offset = 0, dst_offset; 4063 int count, total; 4064 int length = PAGE_SIZE << st_bp->reserved_page_order; 4065 4066 if (offset == 0) 4067 return; 4068 4069 total=st_bp->buffer_bytes - offset; 4070 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4071 src_offset = offset; 4072 if (src_offset < length) 4073 break; 4074 offset -= length; 4075 } 4076 4077 st_bp->buffer_bytes = st_bp->read_pointer = total; 4078 for (dst_seg=dst_offset=0; total > 0; ) { 4079 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4080 struct page *spage = st_bp->reserved_pages[src_seg]; 4081 4082 count = min(length - dst_offset, length - src_offset); 4083 memmove(page_address(dpage) + dst_offset, 4084 page_address(spage) + src_offset, count); 4085 src_offset += count; 4086 if (src_offset >= length) { 4087 src_seg++; 4088 src_offset = 0; 4089 } 4090 dst_offset += count; 4091 if (dst_offset >= length) { 4092 dst_seg++; 4093 dst_offset = 0; 4094 } 4095 total -= count; 4096 } 4097 } 4098 4099 /* Validate the options from command line or module parameters */ 4100 static void validate_options(void) 4101 { 4102 if (buffer_kbs > 0) 4103 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4104 if (max_sg_segs >= ST_FIRST_SG) 4105 st_max_sg_segs = max_sg_segs; 4106 } 4107 4108 #ifndef MODULE 4109 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4110 */ 4111 static int __init st_setup(char *str) 4112 { 4113 int i, len, ints[5]; 4114 char *stp; 4115 4116 stp = get_options(str, ARRAY_SIZE(ints), ints); 4117 4118 if (ints[0] > 0) { 4119 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4120 if (parms[i].val) 4121 *parms[i].val = ints[i + 1]; 4122 } else { 4123 while (stp != NULL) { 4124 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4125 len = strlen(parms[i].name); 4126 if (!strncmp(stp, parms[i].name, len) && 4127 (*(stp + len) == ':' || *(stp + len) == '=')) { 4128 if (parms[i].val) 4129 *parms[i].val = 4130 simple_strtoul(stp + len + 1, NULL, 0); 4131 else 4132 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4133 parms[i].name); 4134 break; 4135 } 4136 } 4137 if (i >= ARRAY_SIZE(parms)) 4138 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4139 stp); 4140 stp = strchr(stp, ','); 4141 if (stp) 4142 stp++; 4143 } 4144 } 4145 4146 validate_options(); 4147 4148 return 1; 4149 } 4150 4151 __setup("st=", st_setup); 4152 4153 #endif 4154 4155 static const struct file_operations st_fops = 4156 { 4157 .owner = THIS_MODULE, 4158 .read = st_read, 4159 .write = st_write, 4160 .unlocked_ioctl = st_ioctl, 4161 #ifdef CONFIG_COMPAT 4162 .compat_ioctl = st_compat_ioctl, 4163 #endif 4164 .open = st_open, 4165 .flush = st_flush, 4166 .release = st_release, 4167 .llseek = noop_llseek, 4168 }; 4169 4170 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4171 { 4172 int i, error; 4173 dev_t cdev_devno; 4174 struct cdev *cdev; 4175 struct device *dev; 4176 struct st_modedef *STm = &(tape->modes[mode]); 4177 char name[10]; 4178 int dev_num = tape->index; 4179 4180 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4181 4182 cdev = cdev_alloc(); 4183 if (!cdev) { 4184 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4185 error = -ENOMEM; 4186 goto out; 4187 } 4188 cdev->owner = THIS_MODULE; 4189 cdev->ops = &st_fops; 4190 STm->cdevs[rew] = cdev; 4191 4192 error = cdev_add(cdev, cdev_devno, 1); 4193 if (error) { 4194 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4195 rew ? "non" : "auto", mode); 4196 pr_err("st%d: Device not attached.\n", dev_num); 4197 goto out_free; 4198 } 4199 4200 i = mode << (4 - ST_NBR_MODE_BITS); 4201 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4202 tape->disk->disk_name, st_formats[i]); 4203 4204 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4205 cdev_devno, &tape->modes[mode], "%s", name); 4206 if (IS_ERR(dev)) { 4207 pr_err("st%d: device_create failed\n", dev_num); 4208 error = PTR_ERR(dev); 4209 goto out_free; 4210 } 4211 4212 STm->devs[rew] = dev; 4213 4214 return 0; 4215 out_free: 4216 cdev_del(STm->cdevs[rew]); 4217 out: 4218 STm->cdevs[rew] = NULL; 4219 STm->devs[rew] = NULL; 4220 return error; 4221 } 4222 4223 static int create_cdevs(struct scsi_tape *tape) 4224 { 4225 int mode, error; 4226 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4227 error = create_one_cdev(tape, mode, 0); 4228 if (error) 4229 return error; 4230 error = create_one_cdev(tape, mode, 1); 4231 if (error) 4232 return error; 4233 } 4234 4235 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4236 &tape->modes[0].devs[0]->kobj, "tape"); 4237 } 4238 4239 static void remove_cdevs(struct scsi_tape *tape) 4240 { 4241 int mode, rew; 4242 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4243 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4244 struct st_modedef *STm = &(tape->modes[mode]); 4245 for (rew = 0; rew < 2; rew++) { 4246 if (STm->cdevs[rew]) 4247 cdev_del(STm->cdevs[rew]); 4248 if (STm->devs[rew]) 4249 device_unregister(STm->devs[rew]); 4250 } 4251 } 4252 } 4253 4254 static int st_probe(struct device *dev) 4255 { 4256 struct scsi_device *SDp = to_scsi_device(dev); 4257 struct gendisk *disk = NULL; 4258 struct scsi_tape *tpnt = NULL; 4259 struct st_modedef *STm; 4260 struct st_partstat *STps; 4261 struct st_buffer *buffer; 4262 int i, error; 4263 char *stp; 4264 4265 if (SDp->type != TYPE_TAPE) 4266 return -ENODEV; 4267 if ((stp = st_incompatible(SDp))) { 4268 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4269 sdev_printk(KERN_INFO, SDp, 4270 "st: The suggested driver is %s.\n", stp); 4271 return -ENODEV; 4272 } 4273 4274 scsi_autopm_get_device(SDp); 4275 i = queue_max_segments(SDp->request_queue); 4276 if (st_max_sg_segs < i) 4277 i = st_max_sg_segs; 4278 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4279 if (buffer == NULL) { 4280 sdev_printk(KERN_ERR, SDp, 4281 "st: Can't allocate new tape buffer. " 4282 "Device not attached.\n"); 4283 goto out; 4284 } 4285 4286 disk = alloc_disk(1); 4287 if (!disk) { 4288 sdev_printk(KERN_ERR, SDp, 4289 "st: out of memory. Device not attached.\n"); 4290 goto out_buffer_free; 4291 } 4292 4293 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4294 if (tpnt == NULL) { 4295 sdev_printk(KERN_ERR, SDp, 4296 "st: Can't allocate device descriptor.\n"); 4297 goto out_put_disk; 4298 } 4299 kref_init(&tpnt->kref); 4300 tpnt->disk = disk; 4301 disk->private_data = &tpnt->driver; 4302 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4303 * take queue reference that release_disk() expects. */ 4304 if (!blk_get_queue(SDp->request_queue)) 4305 goto out_put_disk; 4306 disk->queue = SDp->request_queue; 4307 tpnt->driver = &st_template; 4308 4309 tpnt->device = SDp; 4310 if (SDp->scsi_level <= 2) 4311 tpnt->tape_type = MT_ISSCSI1; 4312 else 4313 tpnt->tape_type = MT_ISSCSI2; 4314 4315 tpnt->buffer = buffer; 4316 tpnt->buffer->last_SRpnt = NULL; 4317 4318 tpnt->inited = 0; 4319 tpnt->dirty = 0; 4320 tpnt->in_use = 0; 4321 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4322 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4323 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4324 tpnt->density = 0; 4325 tpnt->do_auto_lock = ST_AUTO_LOCK; 4326 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4327 tpnt->can_partitions = 0; 4328 tpnt->two_fm = ST_TWO_FM; 4329 tpnt->fast_mteom = ST_FAST_MTEOM; 4330 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4331 tpnt->sili = ST_SILI; 4332 tpnt->immediate = ST_NOWAIT; 4333 tpnt->immediate_filemark = 0; 4334 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4335 tpnt->partition = 0; 4336 tpnt->new_partition = 0; 4337 tpnt->nbr_partitions = 0; 4338 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4339 tpnt->long_timeout = ST_LONG_TIMEOUT; 4340 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4341 4342 for (i = 0; i < ST_NBR_MODES; i++) { 4343 STm = &(tpnt->modes[i]); 4344 STm->defined = 0; 4345 STm->sysv = ST_SYSV; 4346 STm->defaults_for_writes = 0; 4347 STm->do_async_writes = ST_ASYNC_WRITES; 4348 STm->do_buffer_writes = ST_BUFFER_WRITES; 4349 STm->do_read_ahead = ST_READ_AHEAD; 4350 STm->default_compression = ST_DONT_TOUCH; 4351 STm->default_blksize = (-1); /* No forced size */ 4352 STm->default_density = (-1); /* No forced density */ 4353 STm->tape = tpnt; 4354 } 4355 4356 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4357 STps = &(tpnt->ps[i]); 4358 STps->rw = ST_IDLE; 4359 STps->eof = ST_NOEOF; 4360 STps->at_sm = 0; 4361 STps->last_block_valid = 0; 4362 STps->drv_block = (-1); 4363 STps->drv_file = (-1); 4364 } 4365 4366 tpnt->current_mode = 0; 4367 tpnt->modes[0].defined = 1; 4368 4369 tpnt->density_changed = tpnt->compression_changed = 4370 tpnt->blksize_changed = 0; 4371 mutex_init(&tpnt->lock); 4372 4373 idr_preload(GFP_KERNEL); 4374 spin_lock(&st_index_lock); 4375 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4376 spin_unlock(&st_index_lock); 4377 idr_preload_end(); 4378 if (error < 0) { 4379 pr_warn("st: idr allocation failed: %d\n", error); 4380 goto out_put_queue; 4381 } 4382 tpnt->index = error; 4383 sprintf(disk->disk_name, "st%d", tpnt->index); 4384 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4385 if (tpnt->stats == NULL) { 4386 sdev_printk(KERN_ERR, SDp, 4387 "st: Can't allocate statistics.\n"); 4388 goto out_idr_remove; 4389 } 4390 4391 dev_set_drvdata(dev, tpnt); 4392 4393 4394 error = create_cdevs(tpnt); 4395 if (error) 4396 goto out_remove_devs; 4397 scsi_autopm_put_device(SDp); 4398 4399 sdev_printk(KERN_NOTICE, SDp, 4400 "Attached scsi tape %s\n", tape_name(tpnt)); 4401 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4402 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4403 queue_dma_alignment(SDp->request_queue) + 1); 4404 4405 return 0; 4406 4407 out_remove_devs: 4408 remove_cdevs(tpnt); 4409 kfree(tpnt->stats); 4410 out_idr_remove: 4411 spin_lock(&st_index_lock); 4412 idr_remove(&st_index_idr, tpnt->index); 4413 spin_unlock(&st_index_lock); 4414 out_put_queue: 4415 blk_put_queue(disk->queue); 4416 out_put_disk: 4417 put_disk(disk); 4418 kfree(tpnt); 4419 out_buffer_free: 4420 kfree(buffer); 4421 out: 4422 scsi_autopm_put_device(SDp); 4423 return -ENODEV; 4424 }; 4425 4426 4427 static int st_remove(struct device *dev) 4428 { 4429 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4430 int index = tpnt->index; 4431 4432 scsi_autopm_get_device(to_scsi_device(dev)); 4433 remove_cdevs(tpnt); 4434 4435 mutex_lock(&st_ref_mutex); 4436 kref_put(&tpnt->kref, scsi_tape_release); 4437 mutex_unlock(&st_ref_mutex); 4438 spin_lock(&st_index_lock); 4439 idr_remove(&st_index_idr, index); 4440 spin_unlock(&st_index_lock); 4441 return 0; 4442 } 4443 4444 /** 4445 * scsi_tape_release - Called to free the Scsi_Tape structure 4446 * @kref: pointer to embedded kref 4447 * 4448 * st_ref_mutex must be held entering this routine. Because it is 4449 * called on last put, you should always use the scsi_tape_get() 4450 * scsi_tape_put() helpers which manipulate the semaphore directly 4451 * and never do a direct kref_put(). 4452 **/ 4453 static void scsi_tape_release(struct kref *kref) 4454 { 4455 struct scsi_tape *tpnt = to_scsi_tape(kref); 4456 struct gendisk *disk = tpnt->disk; 4457 4458 tpnt->device = NULL; 4459 4460 if (tpnt->buffer) { 4461 normalize_buffer(tpnt->buffer); 4462 kfree(tpnt->buffer->reserved_pages); 4463 kfree(tpnt->buffer); 4464 } 4465 4466 disk->private_data = NULL; 4467 put_disk(disk); 4468 kfree(tpnt->stats); 4469 kfree(tpnt); 4470 return; 4471 } 4472 4473 static struct class st_sysfs_class = { 4474 .name = "scsi_tape", 4475 .dev_groups = st_dev_groups, 4476 }; 4477 4478 static int __init init_st(void) 4479 { 4480 int err; 4481 4482 validate_options(); 4483 4484 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4485 verstr, st_fixed_buffer_size, st_max_sg_segs); 4486 4487 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4488 if (debugging) { 4489 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4490 debugging); 4491 } 4492 4493 err = class_register(&st_sysfs_class); 4494 if (err) { 4495 pr_err("Unable register sysfs class for SCSI tapes\n"); 4496 return err; 4497 } 4498 4499 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4500 ST_MAX_TAPE_ENTRIES, "st"); 4501 if (err) { 4502 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4503 SCSI_TAPE_MAJOR); 4504 goto err_class; 4505 } 4506 4507 err = scsi_register_driver(&st_template.gendrv); 4508 if (err) 4509 goto err_chrdev; 4510 4511 return 0; 4512 4513 err_chrdev: 4514 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4515 ST_MAX_TAPE_ENTRIES); 4516 err_class: 4517 class_unregister(&st_sysfs_class); 4518 return err; 4519 } 4520 4521 static void __exit exit_st(void) 4522 { 4523 scsi_unregister_driver(&st_template.gendrv); 4524 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4525 ST_MAX_TAPE_ENTRIES); 4526 class_unregister(&st_sysfs_class); 4527 idr_destroy(&st_index_idr); 4528 printk(KERN_INFO "st: Unloaded.\n"); 4529 } 4530 4531 module_init(init_st); 4532 module_exit(exit_st); 4533 4534 4535 /* The sysfs driver interface. Read-only at the moment */ 4536 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4537 { 4538 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4539 } 4540 static DRIVER_ATTR_RO(try_direct_io); 4541 4542 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4543 { 4544 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4545 } 4546 static DRIVER_ATTR_RO(fixed_buffer_size); 4547 4548 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4549 { 4550 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4551 } 4552 static DRIVER_ATTR_RO(max_sg_segs); 4553 4554 static ssize_t version_show(struct device_driver *ddd, char *buf) 4555 { 4556 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4557 } 4558 static DRIVER_ATTR_RO(version); 4559 4560 #if DEBUG 4561 static ssize_t debug_flag_store(struct device_driver *ddp, 4562 const char *buf, size_t count) 4563 { 4564 /* We only care what the first byte of the data is the rest is unused. 4565 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4566 * other values have -EINVAL returned if they are passed in. 4567 */ 4568 if (count > 0) { 4569 if (buf[0] == '0') { 4570 debugging = NO_DEBUG; 4571 return count; 4572 } else if (buf[0] == '1') { 4573 debugging = 1; 4574 return count; 4575 } 4576 } 4577 return -EINVAL; 4578 } 4579 4580 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4581 { 4582 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4583 } 4584 static DRIVER_ATTR_RW(debug_flag); 4585 #endif 4586 4587 static struct attribute *st_drv_attrs[] = { 4588 &driver_attr_try_direct_io.attr, 4589 &driver_attr_fixed_buffer_size.attr, 4590 &driver_attr_max_sg_segs.attr, 4591 &driver_attr_version.attr, 4592 #if DEBUG 4593 &driver_attr_debug_flag.attr, 4594 #endif 4595 NULL, 4596 }; 4597 ATTRIBUTE_GROUPS(st_drv); 4598 4599 /* The sysfs simple class interface */ 4600 static ssize_t 4601 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4602 { 4603 struct st_modedef *STm = dev_get_drvdata(dev); 4604 ssize_t l = 0; 4605 4606 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4607 return l; 4608 } 4609 static DEVICE_ATTR_RO(defined); 4610 4611 static ssize_t 4612 default_blksize_show(struct device *dev, struct device_attribute *attr, 4613 char *buf) 4614 { 4615 struct st_modedef *STm = dev_get_drvdata(dev); 4616 ssize_t l = 0; 4617 4618 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4619 return l; 4620 } 4621 static DEVICE_ATTR_RO(default_blksize); 4622 4623 static ssize_t 4624 default_density_show(struct device *dev, struct device_attribute *attr, 4625 char *buf) 4626 { 4627 struct st_modedef *STm = dev_get_drvdata(dev); 4628 ssize_t l = 0; 4629 char *fmt; 4630 4631 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4632 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4633 return l; 4634 } 4635 static DEVICE_ATTR_RO(default_density); 4636 4637 static ssize_t 4638 default_compression_show(struct device *dev, struct device_attribute *attr, 4639 char *buf) 4640 { 4641 struct st_modedef *STm = dev_get_drvdata(dev); 4642 ssize_t l = 0; 4643 4644 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4645 return l; 4646 } 4647 static DEVICE_ATTR_RO(default_compression); 4648 4649 static ssize_t 4650 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4651 { 4652 struct st_modedef *STm = dev_get_drvdata(dev); 4653 struct scsi_tape *STp = STm->tape; 4654 int options; 4655 ssize_t l = 0; 4656 4657 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4658 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4659 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4660 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4661 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4662 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4663 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4664 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4665 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4666 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4667 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4668 options |= STm->sysv ? MT_ST_SYSV : 0; 4669 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4670 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4671 options |= STp->sili ? MT_ST_SILI : 0; 4672 4673 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4674 return l; 4675 } 4676 static DEVICE_ATTR_RO(options); 4677 4678 /* Support for tape stats */ 4679 4680 /** 4681 * read_cnt_show - return read count - count of reads made from tape drive 4682 * @dev: struct device 4683 * @attr: attribute structure 4684 * @buf: buffer to return formatted data in 4685 */ 4686 static ssize_t read_cnt_show(struct device *dev, 4687 struct device_attribute *attr, char *buf) 4688 { 4689 struct st_modedef *STm = dev_get_drvdata(dev); 4690 4691 return sprintf(buf, "%lld", 4692 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4693 } 4694 static DEVICE_ATTR_RO(read_cnt); 4695 4696 /** 4697 * read_byte_cnt_show - return read byte count - tape drives 4698 * may use blocks less than 512 bytes this gives the raw byte count of 4699 * of data read from the tape drive. 4700 * @dev: struct device 4701 * @attr: attribute structure 4702 * @buf: buffer to return formatted data in 4703 */ 4704 static ssize_t read_byte_cnt_show(struct device *dev, 4705 struct device_attribute *attr, char *buf) 4706 { 4707 struct st_modedef *STm = dev_get_drvdata(dev); 4708 4709 return sprintf(buf, "%lld", 4710 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4711 } 4712 static DEVICE_ATTR_RO(read_byte_cnt); 4713 4714 /** 4715 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4716 * @dev: struct device 4717 * @attr: attribute structure 4718 * @buf: buffer to return formatted data in 4719 */ 4720 static ssize_t read_ns_show(struct device *dev, 4721 struct device_attribute *attr, char *buf) 4722 { 4723 struct st_modedef *STm = dev_get_drvdata(dev); 4724 4725 return sprintf(buf, "%lld", 4726 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4727 } 4728 static DEVICE_ATTR_RO(read_ns); 4729 4730 /** 4731 * write_cnt_show - write count - number of user calls 4732 * to write(2) that have written data to tape. 4733 * @dev: struct device 4734 * @attr: attribute structure 4735 * @buf: buffer to return formatted data in 4736 */ 4737 static ssize_t write_cnt_show(struct device *dev, 4738 struct device_attribute *attr, char *buf) 4739 { 4740 struct st_modedef *STm = dev_get_drvdata(dev); 4741 4742 return sprintf(buf, "%lld", 4743 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4744 } 4745 static DEVICE_ATTR_RO(write_cnt); 4746 4747 /** 4748 * write_byte_cnt_show - write byte count - raw count of 4749 * bytes written to tape. 4750 * @dev: struct device 4751 * @attr: attribute structure 4752 * @buf: buffer to return formatted data in 4753 */ 4754 static ssize_t write_byte_cnt_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->write_byte_cnt)); 4761 } 4762 static DEVICE_ATTR_RO(write_byte_cnt); 4763 4764 /** 4765 * write_ns_show - write ns - number of nanoseconds waiting on write 4766 * requests to complete. 4767 * @dev: struct device 4768 * @attr: attribute structure 4769 * @buf: buffer to return formatted data in 4770 */ 4771 static ssize_t write_ns_show(struct device *dev, 4772 struct device_attribute *attr, char *buf) 4773 { 4774 struct st_modedef *STm = dev_get_drvdata(dev); 4775 4776 return sprintf(buf, "%lld", 4777 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4778 } 4779 static DEVICE_ATTR_RO(write_ns); 4780 4781 /** 4782 * in_flight_show - number of I/Os currently in flight - 4783 * in most cases this will be either 0 or 1. It may be higher if someone 4784 * has also issued other SCSI commands such as via an ioctl. 4785 * @dev: struct device 4786 * @attr: attribute structure 4787 * @buf: buffer to return formatted data in 4788 */ 4789 static ssize_t in_flight_show(struct device *dev, 4790 struct device_attribute *attr, char *buf) 4791 { 4792 struct st_modedef *STm = dev_get_drvdata(dev); 4793 4794 return sprintf(buf, "%lld", 4795 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4796 } 4797 static DEVICE_ATTR_RO(in_flight); 4798 4799 /** 4800 * io_ns_show - io wait ns - this is the number of ns spent 4801 * waiting on all I/O to complete. This includes tape movement commands 4802 * such as rewinding, seeking to end of file or tape, it also includes 4803 * read and write. To determine the time spent on tape movement 4804 * subtract the read and write ns from this value. 4805 * @dev: struct device 4806 * @attr: attribute structure 4807 * @buf: buffer to return formatted data in 4808 */ 4809 static ssize_t io_ns_show(struct device *dev, 4810 struct device_attribute *attr, char *buf) 4811 { 4812 struct st_modedef *STm = dev_get_drvdata(dev); 4813 4814 return sprintf(buf, "%lld", 4815 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4816 } 4817 static DEVICE_ATTR_RO(io_ns); 4818 4819 /** 4820 * other_cnt_show - other io count - this is the number of 4821 * I/O requests other than read and write requests. 4822 * Typically these are tape movement requests but will include driver 4823 * tape movement. This includes only requests issued by the st driver. 4824 * @dev: struct device 4825 * @attr: attribute structure 4826 * @buf: buffer to return formatted data in 4827 */ 4828 static ssize_t other_cnt_show(struct device *dev, 4829 struct device_attribute *attr, char *buf) 4830 { 4831 struct st_modedef *STm = dev_get_drvdata(dev); 4832 4833 return sprintf(buf, "%lld", 4834 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4835 } 4836 static DEVICE_ATTR_RO(other_cnt); 4837 4838 /** 4839 * resid_cnt_show - A count of the number of times we get a residual 4840 * count - this should indicate someone issuing reads larger than the 4841 * block size on tape. 4842 * @dev: struct device 4843 * @attr: attribute structure 4844 * @buf: buffer to return formatted data in 4845 */ 4846 static ssize_t resid_cnt_show(struct device *dev, 4847 struct device_attribute *attr, char *buf) 4848 { 4849 struct st_modedef *STm = dev_get_drvdata(dev); 4850 4851 return sprintf(buf, "%lld", 4852 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4853 } 4854 static DEVICE_ATTR_RO(resid_cnt); 4855 4856 static struct attribute *st_dev_attrs[] = { 4857 &dev_attr_defined.attr, 4858 &dev_attr_default_blksize.attr, 4859 &dev_attr_default_density.attr, 4860 &dev_attr_default_compression.attr, 4861 &dev_attr_options.attr, 4862 NULL, 4863 }; 4864 4865 static struct attribute *st_stats_attrs[] = { 4866 &dev_attr_read_cnt.attr, 4867 &dev_attr_read_byte_cnt.attr, 4868 &dev_attr_read_ns.attr, 4869 &dev_attr_write_cnt.attr, 4870 &dev_attr_write_byte_cnt.attr, 4871 &dev_attr_write_ns.attr, 4872 &dev_attr_in_flight.attr, 4873 &dev_attr_io_ns.attr, 4874 &dev_attr_other_cnt.attr, 4875 &dev_attr_resid_cnt.attr, 4876 NULL, 4877 }; 4878 4879 static struct attribute_group stats_group = { 4880 .name = "stats", 4881 .attrs = st_stats_attrs, 4882 }; 4883 4884 static struct attribute_group st_group = { 4885 .attrs = st_dev_attrs, 4886 }; 4887 4888 static const struct attribute_group *st_dev_groups[] = { 4889 &st_group, 4890 &stats_group, 4891 NULL, 4892 }; 4893 4894 /* The following functions may be useful for a larger audience. */ 4895 static int sgl_map_user_pages(struct st_buffer *STbp, 4896 const unsigned int max_pages, unsigned long uaddr, 4897 size_t count, int rw) 4898 { 4899 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4900 unsigned long start = uaddr >> PAGE_SHIFT; 4901 const int nr_pages = end - start; 4902 int res, i, j; 4903 struct page **pages; 4904 struct rq_map_data *mdata = &STbp->map_data; 4905 4906 /* User attempted Overflow! */ 4907 if ((uaddr + count) < uaddr) 4908 return -EINVAL; 4909 4910 /* Too big */ 4911 if (nr_pages > max_pages) 4912 return -ENOMEM; 4913 4914 /* Hmm? */ 4915 if (count == 0) 4916 return 0; 4917 4918 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4919 if (pages == NULL) 4920 return -ENOMEM; 4921 4922 /* Try to fault in all of the necessary pages */ 4923 /* rw==READ means read from drive, write into memory area */ 4924 res = get_user_pages_fast(uaddr, nr_pages, rw == READ, pages); 4925 4926 /* Errors and no page mapped should return here */ 4927 if (res < nr_pages) 4928 goto out_unmap; 4929 4930 for (i=0; i < nr_pages; i++) { 4931 /* FIXME: flush superflous for rw==READ, 4932 * probably wrong function for rw==WRITE 4933 */ 4934 flush_dcache_page(pages[i]); 4935 } 4936 4937 mdata->offset = uaddr & ~PAGE_MASK; 4938 STbp->mapped_pages = pages; 4939 4940 return nr_pages; 4941 out_unmap: 4942 if (res > 0) { 4943 for (j=0; j < res; j++) 4944 put_page(pages[j]); 4945 res = 0; 4946 } 4947 kfree(pages); 4948 return res; 4949 } 4950 4951 4952 /* And unmap them... */ 4953 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4954 const unsigned int nr_pages, int dirtied) 4955 { 4956 int i; 4957 4958 for (i=0; i < nr_pages; i++) { 4959 struct page *page = STbp->mapped_pages[i]; 4960 4961 if (dirtied) 4962 SetPageDirty(page); 4963 /* FIXME: cache flush missing for rw==READ 4964 * FIXME: call the correct reference counting function 4965 */ 4966 put_page(page); 4967 } 4968 kfree(STbp->mapped_pages); 4969 STbp->mapped_pages = NULL; 4970 4971 return 0; 4972 } 4973