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 - 2010 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 = "20101219"; 21 22 #include <linux/module.h> 23 24 #include <linux/fs.h> 25 #include <linux/kernel.h> 26 #include <linux/sched.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 <asm/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 0 60 61 #if DEBUG 62 /* The message level for the debug messages is currently set to KERN_NOTICE 63 so that people can easily see the messages. Later when the debugging messages 64 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 65 #define ST_DEB_MSG KERN_NOTICE 66 #define DEB(a) a 67 #define DEBC(a) if (debugging) { a ; } 68 #else 69 #define DEB(a) 70 #define DEBC(a) 71 #endif 72 73 #define ST_KILOBYTE 1024 74 75 #include "st_options.h" 76 #include "st.h" 77 78 static int buffer_kbs; 79 static int max_sg_segs; 80 static int try_direct_io = TRY_DIRECT_IO; 81 static int try_rdio = 1; 82 static int try_wdio = 1; 83 84 static struct class st_sysfs_class; 85 static const struct attribute_group *st_dev_groups[]; 86 87 MODULE_AUTHOR("Kai Makisara"); 88 MODULE_DESCRIPTION("SCSI tape (st) driver"); 89 MODULE_LICENSE("GPL"); 90 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 92 93 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 94 * of sysfs parameters (which module_param doesn't yet support). 95 * Sysfs parameters defined explicitly later. 96 */ 97 module_param_named(buffer_kbs, buffer_kbs, int, 0); 98 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 99 module_param_named(max_sg_segs, max_sg_segs, int, 0); 100 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 101 module_param_named(try_direct_io, try_direct_io, int, 0); 102 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 103 104 /* Extra parameters for testing */ 105 module_param_named(try_rdio, try_rdio, int, 0); 106 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 107 module_param_named(try_wdio, try_wdio, int, 0); 108 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 109 110 #ifndef MODULE 111 static int write_threshold_kbs; /* retained for compatibility */ 112 static struct st_dev_parm { 113 char *name; 114 int *val; 115 } parms[] __initdata = { 116 { 117 "buffer_kbs", &buffer_kbs 118 }, 119 { /* Retained for compatibility with 2.4 */ 120 "write_threshold_kbs", &write_threshold_kbs 121 }, 122 { 123 "max_sg_segs", NULL 124 }, 125 { 126 "try_direct_io", &try_direct_io 127 } 128 }; 129 #endif 130 131 /* Restrict the number of modes so that names for all are assigned */ 132 #if ST_NBR_MODES > 16 133 #error "Maximum number of modes is 16" 134 #endif 135 /* Bit reversed order to get same names for same minors with all 136 mode counts */ 137 static const char *st_formats[] = { 138 "", "r", "k", "s", "l", "t", "o", "u", 139 "m", "v", "p", "x", "a", "y", "q", "z"}; 140 141 /* The default definitions have been moved to st_options.h */ 142 143 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 144 145 /* The buffer size should fit into the 24 bits for length in the 146 6-byte SCSI read and write commands. */ 147 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 148 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 149 #endif 150 151 static int debugging = DEBUG; 152 153 #define MAX_RETRIES 0 154 #define MAX_WRITE_RETRIES 0 155 #define MAX_READY_RETRIES 0 156 #define NO_TAPE NOT_READY 157 158 #define ST_TIMEOUT (900 * HZ) 159 #define ST_LONG_TIMEOUT (14000 * HZ) 160 161 /* Remove mode bits and auto-rewind bit (7) */ 162 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 163 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) 164 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 165 166 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 167 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 168 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 169 170 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 171 24 bits) */ 172 #define SET_DENS_AND_BLK 0x10001 173 174 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 175 static int st_max_sg_segs = ST_MAX_SG; 176 177 static int modes_defined; 178 179 static int enlarge_buffer(struct st_buffer *, int, int); 180 static void clear_buffer(struct st_buffer *); 181 static void normalize_buffer(struct st_buffer *); 182 static int append_to_buffer(const char __user *, struct st_buffer *, int); 183 static int from_buffer(struct st_buffer *, char __user *, int); 184 static void move_buffer_data(struct st_buffer *, int); 185 186 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 187 unsigned long, size_t, int); 188 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 189 190 static int st_probe(struct device *); 191 static int st_remove(struct device *); 192 193 static int do_create_sysfs_files(void); 194 static void do_remove_sysfs_files(void); 195 196 static struct scsi_driver st_template = { 197 .owner = THIS_MODULE, 198 .gendrv = { 199 .name = "st", 200 .probe = st_probe, 201 .remove = st_remove, 202 }, 203 }; 204 205 static int st_compression(struct scsi_tape *, int); 206 207 static int find_partition(struct scsi_tape *); 208 static int switch_partition(struct scsi_tape *); 209 210 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 211 212 static void scsi_tape_release(struct kref *); 213 214 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 215 216 static DEFINE_MUTEX(st_ref_mutex); 217 static DEFINE_SPINLOCK(st_index_lock); 218 static DEFINE_SPINLOCK(st_use_lock); 219 static DEFINE_IDR(st_index_idr); 220 221 222 223 #include "osst_detect.h" 224 #ifndef SIGS_FROM_OSST 225 #define SIGS_FROM_OSST \ 226 {"OnStream", "SC-", "", "osst"}, \ 227 {"OnStream", "DI-", "", "osst"}, \ 228 {"OnStream", "DP-", "", "osst"}, \ 229 {"OnStream", "USB", "", "osst"}, \ 230 {"OnStream", "FW-", "", "osst"} 231 #endif 232 233 static struct scsi_tape *scsi_tape_get(int dev) 234 { 235 struct scsi_tape *STp = NULL; 236 237 mutex_lock(&st_ref_mutex); 238 spin_lock(&st_index_lock); 239 240 STp = idr_find(&st_index_idr, dev); 241 if (!STp) goto out; 242 243 kref_get(&STp->kref); 244 245 if (!STp->device) 246 goto out_put; 247 248 if (scsi_device_get(STp->device)) 249 goto out_put; 250 251 goto out; 252 253 out_put: 254 kref_put(&STp->kref, scsi_tape_release); 255 STp = NULL; 256 out: 257 spin_unlock(&st_index_lock); 258 mutex_unlock(&st_ref_mutex); 259 return STp; 260 } 261 262 static void scsi_tape_put(struct scsi_tape *STp) 263 { 264 struct scsi_device *sdev = STp->device; 265 266 mutex_lock(&st_ref_mutex); 267 kref_put(&STp->kref, scsi_tape_release); 268 scsi_device_put(sdev); 269 mutex_unlock(&st_ref_mutex); 270 } 271 272 struct st_reject_data { 273 char *vendor; 274 char *model; 275 char *rev; 276 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 277 }; 278 279 static struct st_reject_data reject_list[] = { 280 /* {"XXX", "Yy-", "", NULL}, example */ 281 SIGS_FROM_OSST, 282 {NULL, }}; 283 284 /* If the device signature is on the list of incompatible drives, the 285 function returns a pointer to the name of the correct driver (if known) */ 286 static char * st_incompatible(struct scsi_device* SDp) 287 { 288 struct st_reject_data *rp; 289 290 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 291 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 292 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 293 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 294 if (rp->driver_hint) 295 return rp->driver_hint; 296 else 297 return "unknown"; 298 } 299 return NULL; 300 } 301 302 303 static inline char *tape_name(struct scsi_tape *tape) 304 { 305 return tape->disk->disk_name; 306 } 307 308 309 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 310 { 311 const u8 *ucp; 312 const u8 *sense = SRpnt->sense; 313 314 s->have_sense = scsi_normalize_sense(SRpnt->sense, 315 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 316 s->flags = 0; 317 318 if (s->have_sense) { 319 s->deferred = 0; 320 s->remainder_valid = 321 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 322 switch (sense[0] & 0x7f) { 323 case 0x71: 324 s->deferred = 1; 325 case 0x70: 326 s->fixed_format = 1; 327 s->flags = sense[2] & 0xe0; 328 break; 329 case 0x73: 330 s->deferred = 1; 331 case 0x72: 332 s->fixed_format = 0; 333 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 334 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 335 break; 336 } 337 } 338 } 339 340 341 /* Convert the result to success code */ 342 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 343 { 344 int result = SRpnt->result; 345 u8 scode; 346 DEB(const char *stp;) 347 char *name = tape_name(STp); 348 struct st_cmdstatus *cmdstatp; 349 350 if (!result) 351 return 0; 352 353 cmdstatp = &STp->buffer->cmdstat; 354 st_analyze_sense(SRpnt, cmdstatp); 355 356 if (cmdstatp->have_sense) 357 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 358 else 359 scode = 0; 360 361 DEB( 362 if (debugging) { 363 printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n", 364 name, result, 365 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 366 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 367 if (cmdstatp->have_sense) 368 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 369 } ) /* end DEB */ 370 if (!debugging) { /* Abnormal conditions for tape */ 371 if (!cmdstatp->have_sense) 372 printk(KERN_WARNING 373 "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n", 374 name, result, driver_byte(result), 375 host_byte(result)); 376 else if (cmdstatp->have_sense && 377 scode != NO_SENSE && 378 scode != RECOVERED_ERROR && 379 /* scode != UNIT_ATTENTION && */ 380 scode != BLANK_CHECK && 381 scode != VOLUME_OVERFLOW && 382 SRpnt->cmd[0] != MODE_SENSE && 383 SRpnt->cmd[0] != TEST_UNIT_READY) { 384 385 __scsi_print_sense(name, SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 386 } 387 } 388 389 if (cmdstatp->fixed_format && 390 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 391 if (STp->cln_sense_value) 392 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 393 STp->cln_sense_mask) == STp->cln_sense_value); 394 else 395 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 396 STp->cln_sense_mask) != 0); 397 } 398 if (cmdstatp->have_sense && 399 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 400 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 401 402 STp->pos_unknown |= STp->device->was_reset; 403 404 if (cmdstatp->have_sense && 405 scode == RECOVERED_ERROR 406 #if ST_RECOVERED_WRITE_FATAL 407 && SRpnt->cmd[0] != WRITE_6 408 && SRpnt->cmd[0] != WRITE_FILEMARKS 409 #endif 410 ) { 411 STp->recover_count++; 412 STp->recover_reg++; 413 414 DEB( 415 if (debugging) { 416 if (SRpnt->cmd[0] == READ_6) 417 stp = "read"; 418 else if (SRpnt->cmd[0] == WRITE_6) 419 stp = "write"; 420 else 421 stp = "ioctl"; 422 printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, 423 STp->recover_count); 424 } ) /* end DEB */ 425 426 if (cmdstatp->flags == 0) 427 return 0; 428 } 429 return (-EIO); 430 } 431 432 static struct st_request *st_allocate_request(struct scsi_tape *stp) 433 { 434 struct st_request *streq; 435 436 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 437 if (streq) 438 streq->stp = stp; 439 else { 440 DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n", 441 tape_name(stp));); 442 if (signal_pending(current)) 443 stp->buffer->syscall_result = -EINTR; 444 else 445 stp->buffer->syscall_result = -EBUSY; 446 } 447 448 return streq; 449 } 450 451 static void st_release_request(struct st_request *streq) 452 { 453 kfree(streq); 454 } 455 456 static void st_scsi_execute_end(struct request *req, int uptodate) 457 { 458 struct st_request *SRpnt = req->end_io_data; 459 struct scsi_tape *STp = SRpnt->stp; 460 struct bio *tmp; 461 462 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; 463 STp->buffer->cmdstat.residual = req->resid_len; 464 465 tmp = SRpnt->bio; 466 if (SRpnt->waiting) 467 complete(SRpnt->waiting); 468 469 blk_rq_unmap_user(tmp); 470 __blk_put_request(req->q, req); 471 } 472 473 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 474 int data_direction, void *buffer, unsigned bufflen, 475 int timeout, int retries) 476 { 477 struct request *req; 478 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 479 int err = 0; 480 int write = (data_direction == DMA_TO_DEVICE); 481 482 req = blk_get_request(SRpnt->stp->device->request_queue, write, 483 GFP_KERNEL); 484 if (!req) 485 return DRIVER_ERROR << 24; 486 487 req->cmd_type = REQ_TYPE_BLOCK_PC; 488 req->cmd_flags |= REQ_QUIET; 489 490 mdata->null_mapped = 1; 491 492 if (bufflen) { 493 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 494 GFP_KERNEL); 495 if (err) { 496 blk_put_request(req); 497 return DRIVER_ERROR << 24; 498 } 499 } 500 501 SRpnt->bio = req->bio; 502 req->cmd_len = COMMAND_SIZE(cmd[0]); 503 memset(req->cmd, 0, BLK_MAX_CDB); 504 memcpy(req->cmd, cmd, req->cmd_len); 505 req->sense = SRpnt->sense; 506 req->sense_len = 0; 507 req->timeout = timeout; 508 req->retries = retries; 509 req->end_io_data = SRpnt; 510 511 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); 512 return 0; 513 } 514 515 /* Do the scsi command. Waits until command performed if do_wait is true. 516 Otherwise write_behind_check() is used to check that the command 517 has finished. */ 518 static struct st_request * 519 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 520 int bytes, int direction, int timeout, int retries, int do_wait) 521 { 522 struct completion *waiting; 523 struct rq_map_data *mdata = &STp->buffer->map_data; 524 int ret; 525 526 /* if async, make sure there's no command outstanding */ 527 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 528 printk(KERN_ERR "%s: Async command already active.\n", 529 tape_name(STp)); 530 if (signal_pending(current)) 531 (STp->buffer)->syscall_result = (-EINTR); 532 else 533 (STp->buffer)->syscall_result = (-EBUSY); 534 return NULL; 535 } 536 537 if (!SRpnt) { 538 SRpnt = st_allocate_request(STp); 539 if (!SRpnt) 540 return NULL; 541 } 542 543 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 544 which IO is outstanding. It's nulled out when the IO completes. */ 545 if (!do_wait) 546 (STp->buffer)->last_SRpnt = SRpnt; 547 548 waiting = &STp->wait; 549 init_completion(waiting); 550 SRpnt->waiting = waiting; 551 552 if (STp->buffer->do_dio) { 553 mdata->page_order = 0; 554 mdata->nr_entries = STp->buffer->sg_segs; 555 mdata->pages = STp->buffer->mapped_pages; 556 } else { 557 mdata->page_order = STp->buffer->reserved_page_order; 558 mdata->nr_entries = 559 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 560 mdata->pages = STp->buffer->reserved_pages; 561 mdata->offset = 0; 562 } 563 564 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 565 STp->buffer->cmdstat.have_sense = 0; 566 STp->buffer->syscall_result = 0; 567 568 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 569 retries); 570 if (ret) { 571 /* could not allocate the buffer or request was too large */ 572 (STp->buffer)->syscall_result = (-EBUSY); 573 (STp->buffer)->last_SRpnt = NULL; 574 } else if (do_wait) { 575 wait_for_completion(waiting); 576 SRpnt->waiting = NULL; 577 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 578 } 579 580 return SRpnt; 581 } 582 583 584 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 585 write has been correct but EOM early warning reached, -EIO if write ended in 586 error or zero if write successful. Asynchronous writes are used only in 587 variable block mode. */ 588 static int write_behind_check(struct scsi_tape * STp) 589 { 590 int retval = 0; 591 struct st_buffer *STbuffer; 592 struct st_partstat *STps; 593 struct st_cmdstatus *cmdstatp; 594 struct st_request *SRpnt; 595 596 STbuffer = STp->buffer; 597 if (!STbuffer->writing) 598 return 0; 599 600 DEB( 601 if (STp->write_pending) 602 STp->nbr_waits++; 603 else 604 STp->nbr_finished++; 605 ) /* end DEB */ 606 607 wait_for_completion(&(STp->wait)); 608 SRpnt = STbuffer->last_SRpnt; 609 STbuffer->last_SRpnt = NULL; 610 SRpnt->waiting = NULL; 611 612 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 613 st_release_request(SRpnt); 614 615 STbuffer->buffer_bytes -= STbuffer->writing; 616 STps = &(STp->ps[STp->partition]); 617 if (STps->drv_block >= 0) { 618 if (STp->block_size == 0) 619 STps->drv_block++; 620 else 621 STps->drv_block += STbuffer->writing / STp->block_size; 622 } 623 624 cmdstatp = &STbuffer->cmdstat; 625 if (STbuffer->syscall_result) { 626 retval = -EIO; 627 if (cmdstatp->have_sense && !cmdstatp->deferred && 628 (cmdstatp->flags & SENSE_EOM) && 629 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 630 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 631 /* EOM at write-behind, has all data been written? */ 632 if (!cmdstatp->remainder_valid || 633 cmdstatp->uremainder64 == 0) 634 retval = -ENOSPC; 635 } 636 if (retval == -EIO) 637 STps->drv_block = -1; 638 } 639 STbuffer->writing = 0; 640 641 DEB(if (debugging && retval) 642 printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", 643 tape_name(STp), STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 644 645 return retval; 646 } 647 648 649 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 650 it messes up the block number). */ 651 static int cross_eof(struct scsi_tape * STp, int forward) 652 { 653 struct st_request *SRpnt; 654 unsigned char cmd[MAX_COMMAND_SIZE]; 655 656 cmd[0] = SPACE; 657 cmd[1] = 0x01; /* Space FileMarks */ 658 if (forward) { 659 cmd[2] = cmd[3] = 0; 660 cmd[4] = 1; 661 } else 662 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 663 cmd[5] = 0; 664 665 DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n", 666 tape_name(STp), forward ? "forward" : "backward")); 667 668 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 669 STp->device->request_queue->rq_timeout, 670 MAX_RETRIES, 1); 671 if (!SRpnt) 672 return (STp->buffer)->syscall_result; 673 674 st_release_request(SRpnt); 675 SRpnt = NULL; 676 677 if ((STp->buffer)->cmdstat.midlevel_result != 0) 678 printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", 679 tape_name(STp), forward ? "forward" : "backward"); 680 681 return (STp->buffer)->syscall_result; 682 } 683 684 685 /* Flush the write buffer (never need to write if variable blocksize). */ 686 static int st_flush_write_buffer(struct scsi_tape * STp) 687 { 688 int transfer, blks; 689 int result; 690 unsigned char cmd[MAX_COMMAND_SIZE]; 691 struct st_request *SRpnt; 692 struct st_partstat *STps; 693 694 result = write_behind_check(STp); 695 if (result) 696 return result; 697 698 result = 0; 699 if (STp->dirty == 1) { 700 701 transfer = STp->buffer->buffer_bytes; 702 DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", 703 tape_name(STp), transfer)); 704 705 memset(cmd, 0, MAX_COMMAND_SIZE); 706 cmd[0] = WRITE_6; 707 cmd[1] = 1; 708 blks = transfer / STp->block_size; 709 cmd[2] = blks >> 16; 710 cmd[3] = blks >> 8; 711 cmd[4] = blks; 712 713 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 714 STp->device->request_queue->rq_timeout, 715 MAX_WRITE_RETRIES, 1); 716 if (!SRpnt) 717 return (STp->buffer)->syscall_result; 718 719 STps = &(STp->ps[STp->partition]); 720 if ((STp->buffer)->syscall_result != 0) { 721 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 722 723 if (cmdstatp->have_sense && !cmdstatp->deferred && 724 (cmdstatp->flags & SENSE_EOM) && 725 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 726 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 727 (!cmdstatp->remainder_valid || 728 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 729 STp->dirty = 0; 730 (STp->buffer)->buffer_bytes = 0; 731 if (STps->drv_block >= 0) 732 STps->drv_block += blks; 733 result = (-ENOSPC); 734 } else { 735 printk(KERN_ERR "%s: Error on flush.\n", 736 tape_name(STp)); 737 STps->drv_block = (-1); 738 result = (-EIO); 739 } 740 } else { 741 if (STps->drv_block >= 0) 742 STps->drv_block += blks; 743 STp->dirty = 0; 744 (STp->buffer)->buffer_bytes = 0; 745 } 746 st_release_request(SRpnt); 747 SRpnt = NULL; 748 } 749 return result; 750 } 751 752 753 /* Flush the tape buffer. The tape will be positioned correctly unless 754 seek_next is true. */ 755 static int flush_buffer(struct scsi_tape *STp, int seek_next) 756 { 757 int backspace, result; 758 struct st_buffer *STbuffer; 759 struct st_partstat *STps; 760 761 STbuffer = STp->buffer; 762 763 /* 764 * If there was a bus reset, block further access 765 * to this device. 766 */ 767 if (STp->pos_unknown) 768 return (-EIO); 769 770 if (STp->ready != ST_READY) 771 return 0; 772 STps = &(STp->ps[STp->partition]); 773 if (STps->rw == ST_WRITING) /* Writing */ 774 return st_flush_write_buffer(STp); 775 776 if (STp->block_size == 0) 777 return 0; 778 779 backspace = ((STp->buffer)->buffer_bytes + 780 (STp->buffer)->read_pointer) / STp->block_size - 781 ((STp->buffer)->read_pointer + STp->block_size - 1) / 782 STp->block_size; 783 (STp->buffer)->buffer_bytes = 0; 784 (STp->buffer)->read_pointer = 0; 785 result = 0; 786 if (!seek_next) { 787 if (STps->eof == ST_FM_HIT) { 788 result = cross_eof(STp, 0); /* Back over the EOF hit */ 789 if (!result) 790 STps->eof = ST_NOEOF; 791 else { 792 if (STps->drv_file >= 0) 793 STps->drv_file++; 794 STps->drv_block = 0; 795 } 796 } 797 if (!result && backspace > 0) 798 result = st_int_ioctl(STp, MTBSR, backspace); 799 } else if (STps->eof == ST_FM_HIT) { 800 if (STps->drv_file >= 0) 801 STps->drv_file++; 802 STps->drv_block = 0; 803 STps->eof = ST_NOEOF; 804 } 805 return result; 806 807 } 808 809 /* Set the mode parameters */ 810 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 811 { 812 int set_it = 0; 813 unsigned long arg; 814 char *name = tape_name(STp); 815 816 if (!STp->density_changed && 817 STm->default_density >= 0 && 818 STm->default_density != STp->density) { 819 arg = STm->default_density; 820 set_it = 1; 821 } else 822 arg = STp->density; 823 arg <<= MT_ST_DENSITY_SHIFT; 824 if (!STp->blksize_changed && 825 STm->default_blksize >= 0 && 826 STm->default_blksize != STp->block_size) { 827 arg |= STm->default_blksize; 828 set_it = 1; 829 } else 830 arg |= STp->block_size; 831 if (set_it && 832 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 833 printk(KERN_WARNING 834 "%s: Can't set default block size to %d bytes and density %x.\n", 835 name, STm->default_blksize, STm->default_density); 836 if (modes_defined) 837 return (-EINVAL); 838 } 839 return 0; 840 } 841 842 843 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 844 static int do_door_lock(struct scsi_tape * STp, int do_lock) 845 { 846 int retval, cmd; 847 DEB(char *name = tape_name(STp);) 848 849 850 cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; 851 DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, 852 do_lock ? "L" : "Unl")); 853 retval = scsi_ioctl(STp->device, cmd, NULL); 854 if (!retval) { 855 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 856 } 857 else { 858 STp->door_locked = ST_LOCK_FAILS; 859 } 860 return retval; 861 } 862 863 864 /* Set the internal state after reset */ 865 static void reset_state(struct scsi_tape *STp) 866 { 867 int i; 868 struct st_partstat *STps; 869 870 STp->pos_unknown = 0; 871 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 872 STps = &(STp->ps[i]); 873 STps->rw = ST_IDLE; 874 STps->eof = ST_NOEOF; 875 STps->at_sm = 0; 876 STps->last_block_valid = 0; 877 STps->drv_block = -1; 878 STps->drv_file = -1; 879 } 880 if (STp->can_partitions) { 881 STp->partition = find_partition(STp); 882 if (STp->partition < 0) 883 STp->partition = 0; 884 STp->new_partition = STp->partition; 885 } 886 } 887 888 /* Test if the drive is ready. Returns either one of the codes below or a negative system 889 error code. */ 890 #define CHKRES_READY 0 891 #define CHKRES_NEW_SESSION 1 892 #define CHKRES_NOT_READY 2 893 #define CHKRES_NO_TAPE 3 894 895 #define MAX_ATTENTIONS 10 896 897 static int test_ready(struct scsi_tape *STp, int do_wait) 898 { 899 int attentions, waits, max_wait, scode; 900 int retval = CHKRES_READY, new_session = 0; 901 unsigned char cmd[MAX_COMMAND_SIZE]; 902 struct st_request *SRpnt = NULL; 903 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 904 905 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 906 907 for (attentions=waits=0; ; ) { 908 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 909 cmd[0] = TEST_UNIT_READY; 910 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 911 STp->long_timeout, MAX_READY_RETRIES, 1); 912 913 if (!SRpnt) { 914 retval = (STp->buffer)->syscall_result; 915 break; 916 } 917 918 if (cmdstatp->have_sense) { 919 920 scode = cmdstatp->sense_hdr.sense_key; 921 922 if (scode == UNIT_ATTENTION) { /* New media? */ 923 new_session = 1; 924 if (attentions < MAX_ATTENTIONS) { 925 attentions++; 926 continue; 927 } 928 else { 929 retval = (-EIO); 930 break; 931 } 932 } 933 934 if (scode == NOT_READY) { 935 if (waits < max_wait) { 936 if (msleep_interruptible(1000)) { 937 retval = (-EINTR); 938 break; 939 } 940 waits++; 941 continue; 942 } 943 else { 944 if ((STp->device)->scsi_level >= SCSI_2 && 945 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 946 retval = CHKRES_NO_TAPE; 947 else 948 retval = CHKRES_NOT_READY; 949 break; 950 } 951 } 952 } 953 954 retval = (STp->buffer)->syscall_result; 955 if (!retval) 956 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 957 break; 958 } 959 960 if (SRpnt != NULL) 961 st_release_request(SRpnt); 962 return retval; 963 } 964 965 966 /* See if the drive is ready and gather information about the tape. Return values: 967 < 0 negative error code from errno.h 968 0 drive ready 969 1 drive not ready (possibly no tape) 970 */ 971 static int check_tape(struct scsi_tape *STp, struct file *filp) 972 { 973 int i, retval, new_session = 0, do_wait; 974 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 975 unsigned short st_flags = filp->f_flags; 976 struct st_request *SRpnt = NULL; 977 struct st_modedef *STm; 978 struct st_partstat *STps; 979 char *name = tape_name(STp); 980 struct inode *inode = file_inode(filp); 981 int mode = TAPE_MODE(inode); 982 983 STp->ready = ST_READY; 984 985 if (mode != STp->current_mode) { 986 DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", 987 name, STp->current_mode, mode)); 988 new_session = 1; 989 STp->current_mode = mode; 990 } 991 STm = &(STp->modes[STp->current_mode]); 992 993 saved_cleaning = STp->cleaning_req; 994 STp->cleaning_req = 0; 995 996 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 997 retval = test_ready(STp, do_wait); 998 999 if (retval < 0) 1000 goto err_out; 1001 1002 if (retval == CHKRES_NEW_SESSION) { 1003 STp->pos_unknown = 0; 1004 STp->partition = STp->new_partition = 0; 1005 if (STp->can_partitions) 1006 STp->nbr_partitions = 1; /* This guess will be updated later 1007 if necessary */ 1008 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1009 STps = &(STp->ps[i]); 1010 STps->rw = ST_IDLE; 1011 STps->eof = ST_NOEOF; 1012 STps->at_sm = 0; 1013 STps->last_block_valid = 0; 1014 STps->drv_block = 0; 1015 STps->drv_file = 0; 1016 } 1017 new_session = 1; 1018 } 1019 else { 1020 STp->cleaning_req |= saved_cleaning; 1021 1022 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1023 if (retval == CHKRES_NO_TAPE) 1024 STp->ready = ST_NO_TAPE; 1025 else 1026 STp->ready = ST_NOT_READY; 1027 1028 STp->density = 0; /* Clear the erroneous "residue" */ 1029 STp->write_prot = 0; 1030 STp->block_size = 0; 1031 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1032 STp->partition = STp->new_partition = 0; 1033 STp->door_locked = ST_UNLOCKED; 1034 return CHKRES_NOT_READY; 1035 } 1036 } 1037 1038 if (STp->omit_blklims) 1039 STp->min_block = STp->max_block = (-1); 1040 else { 1041 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1042 cmd[0] = READ_BLOCK_LIMITS; 1043 1044 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1045 STp->device->request_queue->rq_timeout, 1046 MAX_READY_RETRIES, 1); 1047 if (!SRpnt) { 1048 retval = (STp->buffer)->syscall_result; 1049 goto err_out; 1050 } 1051 1052 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1053 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1054 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1055 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1056 (STp->buffer)->b_data[5]; 1057 if ( DEB( debugging || ) !STp->inited) 1058 printk(KERN_INFO 1059 "%s: Block limits %d - %d bytes.\n", name, 1060 STp->min_block, STp->max_block); 1061 } else { 1062 STp->min_block = STp->max_block = (-1); 1063 DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", 1064 name)); 1065 } 1066 } 1067 1068 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1069 cmd[0] = MODE_SENSE; 1070 cmd[4] = 12; 1071 1072 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1073 STp->device->request_queue->rq_timeout, 1074 MAX_READY_RETRIES, 1); 1075 if (!SRpnt) { 1076 retval = (STp->buffer)->syscall_result; 1077 goto err_out; 1078 } 1079 1080 if ((STp->buffer)->syscall_result != 0) { 1081 DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); 1082 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1083 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1084 STp->drv_write_prot = 0; 1085 } else { 1086 DEBC(printk(ST_DEB_MSG 1087 "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", 1088 name, 1089 (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], 1090 (STp->buffer)->b_data[2], (STp->buffer)->b_data[3])); 1091 1092 if ((STp->buffer)->b_data[3] >= 8) { 1093 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1094 STp->density = (STp->buffer)->b_data[4]; 1095 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1096 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1097 DEBC(printk(ST_DEB_MSG 1098 "%s: Density %x, tape length: %x, drv buffer: %d\n", 1099 name, STp->density, (STp->buffer)->b_data[5] * 65536 + 1100 (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], 1101 STp->drv_buffer)); 1102 } 1103 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1104 if (!STp->drv_buffer && STp->immediate_filemark) { 1105 printk(KERN_WARNING 1106 "%s: non-buffered tape: disabling writing immediate filemarks\n", 1107 name); 1108 STp->immediate_filemark = 0; 1109 } 1110 } 1111 st_release_request(SRpnt); 1112 SRpnt = NULL; 1113 STp->inited = 1; 1114 1115 if (STp->block_size > 0) 1116 (STp->buffer)->buffer_blocks = 1117 (STp->buffer)->buffer_size / STp->block_size; 1118 else 1119 (STp->buffer)->buffer_blocks = 1; 1120 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1121 1122 DEBC(printk(ST_DEB_MSG 1123 "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, 1124 STp->block_size, (STp->buffer)->buffer_size, 1125 (STp->buffer)->buffer_blocks)); 1126 1127 if (STp->drv_write_prot) { 1128 STp->write_prot = 1; 1129 1130 DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); 1131 1132 if (do_wait && 1133 ((st_flags & O_ACCMODE) == O_WRONLY || 1134 (st_flags & O_ACCMODE) == O_RDWR)) { 1135 retval = (-EROFS); 1136 goto err_out; 1137 } 1138 } 1139 1140 if (STp->can_partitions && STp->nbr_partitions < 1) { 1141 /* This code is reached when the device is opened for the first time 1142 after the driver has been initialized with tape in the drive and the 1143 partition support has been enabled. */ 1144 DEBC(printk(ST_DEB_MSG 1145 "%s: Updating partition number in status.\n", name)); 1146 if ((STp->partition = find_partition(STp)) < 0) { 1147 retval = STp->partition; 1148 goto err_out; 1149 } 1150 STp->new_partition = STp->partition; 1151 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1152 } 1153 1154 if (new_session) { /* Change the drive parameters for the new mode */ 1155 STp->density_changed = STp->blksize_changed = 0; 1156 STp->compression_changed = 0; 1157 if (!(STm->defaults_for_writes) && 1158 (retval = set_mode_densblk(STp, STm)) < 0) 1159 goto err_out; 1160 1161 if (STp->default_drvbuffer != 0xff) { 1162 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1163 printk(KERN_WARNING 1164 "%s: Can't set default drive buffering to %d.\n", 1165 name, STp->default_drvbuffer); 1166 } 1167 } 1168 1169 return CHKRES_READY; 1170 1171 err_out: 1172 return retval; 1173 } 1174 1175 1176 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1177 module count. */ 1178 static int st_open(struct inode *inode, struct file *filp) 1179 { 1180 int i, retval = (-EIO); 1181 int resumed = 0; 1182 struct scsi_tape *STp; 1183 struct st_partstat *STps; 1184 int dev = TAPE_NR(inode); 1185 char *name; 1186 1187 /* 1188 * We really want to do nonseekable_open(inode, filp); here, but some 1189 * versions of tar incorrectly call lseek on tapes and bail out if that 1190 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1191 */ 1192 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1193 1194 if (!(STp = scsi_tape_get(dev))) { 1195 return -ENXIO; 1196 } 1197 1198 filp->private_data = STp; 1199 name = tape_name(STp); 1200 1201 spin_lock(&st_use_lock); 1202 if (STp->in_use) { 1203 spin_unlock(&st_use_lock); 1204 scsi_tape_put(STp); 1205 DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) 1206 return (-EBUSY); 1207 } 1208 1209 STp->in_use = 1; 1210 spin_unlock(&st_use_lock); 1211 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1212 1213 if (scsi_autopm_get_device(STp->device) < 0) { 1214 retval = -EIO; 1215 goto err_out; 1216 } 1217 resumed = 1; 1218 if (!scsi_block_when_processing_errors(STp->device)) { 1219 retval = (-ENXIO); 1220 goto err_out; 1221 } 1222 1223 /* See that we have at least a one page buffer available */ 1224 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1225 printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", 1226 name); 1227 retval = (-EOVERFLOW); 1228 goto err_out; 1229 } 1230 1231 (STp->buffer)->cleared = 0; 1232 (STp->buffer)->writing = 0; 1233 (STp->buffer)->syscall_result = 0; 1234 1235 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1236 1237 STp->dirty = 0; 1238 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1239 STps = &(STp->ps[i]); 1240 STps->rw = ST_IDLE; 1241 } 1242 STp->try_dio_now = STp->try_dio; 1243 STp->recover_count = 0; 1244 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1245 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1246 1247 retval = check_tape(STp, filp); 1248 if (retval < 0) 1249 goto err_out; 1250 if ((filp->f_flags & O_NONBLOCK) == 0 && 1251 retval != CHKRES_READY) { 1252 if (STp->ready == NO_TAPE) 1253 retval = (-ENOMEDIUM); 1254 else 1255 retval = (-EIO); 1256 goto err_out; 1257 } 1258 return 0; 1259 1260 err_out: 1261 normalize_buffer(STp->buffer); 1262 spin_lock(&st_use_lock); 1263 STp->in_use = 0; 1264 spin_unlock(&st_use_lock); 1265 scsi_tape_put(STp); 1266 if (resumed) 1267 scsi_autopm_put_device(STp->device); 1268 return retval; 1269 1270 } 1271 1272 1273 /* Flush the tape buffer before close */ 1274 static int st_flush(struct file *filp, fl_owner_t id) 1275 { 1276 int result = 0, result2; 1277 unsigned char cmd[MAX_COMMAND_SIZE]; 1278 struct st_request *SRpnt; 1279 struct scsi_tape *STp = filp->private_data; 1280 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1281 struct st_partstat *STps = &(STp->ps[STp->partition]); 1282 char *name = tape_name(STp); 1283 1284 if (file_count(filp) > 1) 1285 return 0; 1286 1287 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1288 result = st_flush_write_buffer(STp); 1289 if (result != 0 && result != (-ENOSPC)) 1290 goto out; 1291 } 1292 1293 if (STp->can_partitions && 1294 (result2 = switch_partition(STp)) < 0) { 1295 DEBC(printk(ST_DEB_MSG 1296 "%s: switch_partition at close failed.\n", name)); 1297 if (result == 0) 1298 result = result2; 1299 goto out; 1300 } 1301 1302 DEBC( if (STp->nbr_requests) 1303 printk(KERN_DEBUG "%s: Number of r/w requests %d, dio used in %d, pages %d.\n", 1304 name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages)); 1305 1306 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1307 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1308 1309 DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", 1310 name, STp->nbr_waits, STp->nbr_finished); 1311 ) 1312 1313 memset(cmd, 0, MAX_COMMAND_SIZE); 1314 cmd[0] = WRITE_FILEMARKS; 1315 if (STp->immediate_filemark) 1316 cmd[1] = 1; 1317 cmd[4] = 1 + STp->two_fm; 1318 1319 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1320 STp->device->request_queue->rq_timeout, 1321 MAX_WRITE_RETRIES, 1); 1322 if (!SRpnt) { 1323 result = (STp->buffer)->syscall_result; 1324 goto out; 1325 } 1326 1327 if (STp->buffer->syscall_result == 0 || 1328 (cmdstatp->have_sense && !cmdstatp->deferred && 1329 (cmdstatp->flags & SENSE_EOM) && 1330 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1331 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1332 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1333 /* Write successful at EOM */ 1334 st_release_request(SRpnt); 1335 SRpnt = NULL; 1336 if (STps->drv_file >= 0) 1337 STps->drv_file++; 1338 STps->drv_block = 0; 1339 if (STp->two_fm) 1340 cross_eof(STp, 0); 1341 STps->eof = ST_FM; 1342 } 1343 else { /* Write error */ 1344 st_release_request(SRpnt); 1345 SRpnt = NULL; 1346 printk(KERN_ERR "%s: Error on write filemark.\n", name); 1347 if (result == 0) 1348 result = (-EIO); 1349 } 1350 1351 DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", 1352 name, cmd[4])); 1353 } else if (!STp->rew_at_close) { 1354 STps = &(STp->ps[STp->partition]); 1355 if (!STm->sysv || STps->rw != ST_READING) { 1356 if (STp->can_bsr) 1357 result = flush_buffer(STp, 0); 1358 else if (STps->eof == ST_FM_HIT) { 1359 result = cross_eof(STp, 0); 1360 if (result) { 1361 if (STps->drv_file >= 0) 1362 STps->drv_file++; 1363 STps->drv_block = 0; 1364 STps->eof = ST_FM; 1365 } else 1366 STps->eof = ST_NOEOF; 1367 } 1368 } else if ((STps->eof == ST_NOEOF && 1369 !(result = cross_eof(STp, 1))) || 1370 STps->eof == ST_FM_HIT) { 1371 if (STps->drv_file >= 0) 1372 STps->drv_file++; 1373 STps->drv_block = 0; 1374 STps->eof = ST_FM; 1375 } 1376 } 1377 1378 out: 1379 if (STp->rew_at_close) { 1380 result2 = st_int_ioctl(STp, MTREW, 1); 1381 if (result == 0) 1382 result = result2; 1383 } 1384 return result; 1385 } 1386 1387 1388 /* Close the device and release it. BKL is not needed: this is the only thread 1389 accessing this tape. */ 1390 static int st_release(struct inode *inode, struct file *filp) 1391 { 1392 int result = 0; 1393 struct scsi_tape *STp = filp->private_data; 1394 1395 if (STp->door_locked == ST_LOCKED_AUTO) 1396 do_door_lock(STp, 0); 1397 1398 normalize_buffer(STp->buffer); 1399 spin_lock(&st_use_lock); 1400 STp->in_use = 0; 1401 spin_unlock(&st_use_lock); 1402 scsi_autopm_put_device(STp->device); 1403 scsi_tape_put(STp); 1404 1405 return result; 1406 } 1407 1408 /* The checks common to both reading and writing */ 1409 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1410 { 1411 ssize_t retval = 0; 1412 1413 /* 1414 * If we are in the middle of error recovery, don't let anyone 1415 * else try and use this device. Also, if error recovery fails, it 1416 * may try and take the device offline, in which case all further 1417 * access to the device is prohibited. 1418 */ 1419 if (!scsi_block_when_processing_errors(STp->device)) { 1420 retval = (-ENXIO); 1421 goto out; 1422 } 1423 1424 if (STp->ready != ST_READY) { 1425 if (STp->ready == ST_NO_TAPE) 1426 retval = (-ENOMEDIUM); 1427 else 1428 retval = (-EIO); 1429 goto out; 1430 } 1431 1432 if (! STp->modes[STp->current_mode].defined) { 1433 retval = (-ENXIO); 1434 goto out; 1435 } 1436 1437 1438 /* 1439 * If there was a bus reset, block further access 1440 * to this device. 1441 */ 1442 if (STp->pos_unknown) { 1443 retval = (-EIO); 1444 goto out; 1445 } 1446 1447 if (count == 0) 1448 goto out; 1449 1450 DEB( 1451 if (!STp->in_use) { 1452 printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); 1453 retval = (-EIO); 1454 goto out; 1455 } ) /* end DEB */ 1456 1457 if (STp->can_partitions && 1458 (retval = switch_partition(STp)) < 0) 1459 goto out; 1460 1461 if (STp->block_size == 0 && STp->max_block > 0 && 1462 (count < STp->min_block || count > STp->max_block)) { 1463 retval = (-EINVAL); 1464 goto out; 1465 } 1466 1467 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1468 !do_door_lock(STp, 1)) 1469 STp->door_locked = ST_LOCKED_AUTO; 1470 1471 out: 1472 return retval; 1473 } 1474 1475 1476 static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1477 size_t count, int is_read) 1478 { 1479 int i, bufsize, retval = 0; 1480 struct st_buffer *STbp = STp->buffer; 1481 1482 if (is_read) 1483 i = STp->try_dio_now && try_rdio; 1484 else 1485 i = STp->try_dio_now && try_wdio; 1486 1487 if (i && ((unsigned long)buf & queue_dma_alignment( 1488 STp->device->request_queue)) == 0) { 1489 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1490 count, (is_read ? READ : WRITE)); 1491 if (i > 0) { 1492 STbp->do_dio = i; 1493 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1494 } 1495 else 1496 STbp->do_dio = 0; /* fall back to buffering with any error */ 1497 STbp->sg_segs = STbp->do_dio; 1498 DEB( 1499 if (STbp->do_dio) { 1500 STp->nbr_dio++; 1501 STp->nbr_pages += STbp->do_dio; 1502 } 1503 ) 1504 } else 1505 STbp->do_dio = 0; 1506 DEB( STp->nbr_requests++; ) 1507 1508 if (!STbp->do_dio) { 1509 if (STp->block_size) 1510 bufsize = STp->block_size > st_fixed_buffer_size ? 1511 STp->block_size : st_fixed_buffer_size; 1512 else { 1513 bufsize = count; 1514 /* Make sure that data from previous user is not leaked even if 1515 HBA does not return correct residual */ 1516 if (is_read && STp->sili && !STbp->cleared) 1517 clear_buffer(STbp); 1518 } 1519 1520 if (bufsize > STbp->buffer_size && 1521 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { 1522 printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", 1523 tape_name(STp), bufsize); 1524 retval = (-EOVERFLOW); 1525 goto out; 1526 } 1527 if (STp->block_size) 1528 STbp->buffer_blocks = bufsize / STp->block_size; 1529 } 1530 1531 out: 1532 return retval; 1533 } 1534 1535 1536 /* Can be called more than once after each setup_buffer() */ 1537 static void release_buffering(struct scsi_tape *STp, int is_read) 1538 { 1539 struct st_buffer *STbp; 1540 1541 STbp = STp->buffer; 1542 if (STbp->do_dio) { 1543 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1544 STbp->do_dio = 0; 1545 STbp->sg_segs = 0; 1546 } 1547 } 1548 1549 1550 /* Write command */ 1551 static ssize_t 1552 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1553 { 1554 ssize_t total; 1555 ssize_t i, do_count, blks, transfer; 1556 ssize_t retval; 1557 int undone, retry_eot = 0, scode; 1558 int async_write; 1559 unsigned char cmd[MAX_COMMAND_SIZE]; 1560 const char __user *b_point; 1561 struct st_request *SRpnt = NULL; 1562 struct scsi_tape *STp = filp->private_data; 1563 struct st_modedef *STm; 1564 struct st_partstat *STps; 1565 struct st_buffer *STbp; 1566 char *name = tape_name(STp); 1567 1568 if (mutex_lock_interruptible(&STp->lock)) 1569 return -ERESTARTSYS; 1570 1571 retval = rw_checks(STp, filp, count); 1572 if (retval || count == 0) 1573 goto out; 1574 1575 /* Write must be integral number of blocks */ 1576 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1577 printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", 1578 name); 1579 retval = (-EINVAL); 1580 goto out; 1581 } 1582 1583 STm = &(STp->modes[STp->current_mode]); 1584 STps = &(STp->ps[STp->partition]); 1585 1586 if (STp->write_prot) { 1587 retval = (-EACCES); 1588 goto out; 1589 } 1590 1591 1592 if (STps->rw == ST_READING) { 1593 retval = flush_buffer(STp, 0); 1594 if (retval) 1595 goto out; 1596 STps->rw = ST_WRITING; 1597 } else if (STps->rw != ST_WRITING && 1598 STps->drv_file == 0 && STps->drv_block == 0) { 1599 if ((retval = set_mode_densblk(STp, STm)) < 0) 1600 goto out; 1601 if (STm->default_compression != ST_DONT_TOUCH && 1602 !(STp->compression_changed)) { 1603 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1604 printk(KERN_WARNING "%s: Can't set default compression.\n", 1605 name); 1606 if (modes_defined) { 1607 retval = (-EINVAL); 1608 goto out; 1609 } 1610 } 1611 } 1612 } 1613 1614 STbp = STp->buffer; 1615 i = write_behind_check(STp); 1616 if (i) { 1617 if (i == -ENOSPC) 1618 STps->eof = ST_EOM_OK; 1619 else 1620 STps->eof = ST_EOM_ERROR; 1621 } 1622 1623 if (STps->eof == ST_EOM_OK) { 1624 STps->eof = ST_EOD_1; /* allow next write */ 1625 retval = (-ENOSPC); 1626 goto out; 1627 } 1628 else if (STps->eof == ST_EOM_ERROR) { 1629 retval = (-EIO); 1630 goto out; 1631 } 1632 1633 /* Check the buffer readability in cases where copy_user might catch 1634 the problems after some tape movement. */ 1635 if (STp->block_size != 0 && 1636 !STbp->do_dio && 1637 (copy_from_user(&i, buf, 1) != 0 || 1638 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1639 retval = (-EFAULT); 1640 goto out; 1641 } 1642 1643 retval = setup_buffering(STp, buf, count, 0); 1644 if (retval) 1645 goto out; 1646 1647 total = count; 1648 1649 memset(cmd, 0, MAX_COMMAND_SIZE); 1650 cmd[0] = WRITE_6; 1651 cmd[1] = (STp->block_size != 0); 1652 1653 STps->rw = ST_WRITING; 1654 1655 b_point = buf; 1656 while (count > 0 && !retry_eot) { 1657 1658 if (STbp->do_dio) { 1659 do_count = count; 1660 } 1661 else { 1662 if (STp->block_size == 0) 1663 do_count = count; 1664 else { 1665 do_count = STbp->buffer_blocks * STp->block_size - 1666 STbp->buffer_bytes; 1667 if (do_count > count) 1668 do_count = count; 1669 } 1670 1671 i = append_to_buffer(b_point, STbp, do_count); 1672 if (i) { 1673 retval = i; 1674 goto out; 1675 } 1676 } 1677 count -= do_count; 1678 b_point += do_count; 1679 1680 async_write = STp->block_size == 0 && !STbp->do_dio && 1681 STm->do_async_writes && STps->eof < ST_EOM_OK; 1682 1683 if (STp->block_size != 0 && STm->do_buffer_writes && 1684 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1685 STbp->buffer_bytes < STbp->buffer_size) { 1686 STp->dirty = 1; 1687 /* Don't write a buffer that is not full enough. */ 1688 if (!async_write && count == 0) 1689 break; 1690 } 1691 1692 retry_write: 1693 if (STp->block_size == 0) 1694 blks = transfer = do_count; 1695 else { 1696 if (!STbp->do_dio) 1697 blks = STbp->buffer_bytes; 1698 else 1699 blks = do_count; 1700 blks /= STp->block_size; 1701 transfer = blks * STp->block_size; 1702 } 1703 cmd[2] = blks >> 16; 1704 cmd[3] = blks >> 8; 1705 cmd[4] = blks; 1706 1707 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1708 STp->device->request_queue->rq_timeout, 1709 MAX_WRITE_RETRIES, !async_write); 1710 if (!SRpnt) { 1711 retval = STbp->syscall_result; 1712 goto out; 1713 } 1714 if (async_write && !STbp->syscall_result) { 1715 STbp->writing = transfer; 1716 STp->dirty = !(STbp->writing == 1717 STbp->buffer_bytes); 1718 SRpnt = NULL; /* Prevent releasing this request! */ 1719 DEB( STp->write_pending = 1; ) 1720 break; 1721 } 1722 1723 if (STbp->syscall_result != 0) { 1724 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1725 1726 DEBC(printk(ST_DEB_MSG "%s: Error on write:\n", name)); 1727 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1728 scode = cmdstatp->sense_hdr.sense_key; 1729 if (cmdstatp->remainder_valid) 1730 undone = (int)cmdstatp->uremainder64; 1731 else if (STp->block_size == 0 && 1732 scode == VOLUME_OVERFLOW) 1733 undone = transfer; 1734 else 1735 undone = 0; 1736 if (STp->block_size != 0) 1737 undone *= STp->block_size; 1738 if (undone <= do_count) { 1739 /* Only data from this write is not written */ 1740 count += undone; 1741 b_point -= undone; 1742 do_count -= undone; 1743 if (STp->block_size) 1744 blks = (transfer - undone) / STp->block_size; 1745 STps->eof = ST_EOM_OK; 1746 /* Continue in fixed block mode if all written 1747 in this request but still something left to write 1748 (retval left to zero) 1749 */ 1750 if (STp->block_size == 0 || 1751 undone > 0 || count == 0) 1752 retval = (-ENOSPC); /* EOM within current request */ 1753 DEBC(printk(ST_DEB_MSG 1754 "%s: EOM with %d bytes unwritten.\n", 1755 name, (int)count)); 1756 } else { 1757 /* EOT within data buffered earlier (possible only 1758 in fixed block mode without direct i/o) */ 1759 if (!retry_eot && !cmdstatp->deferred && 1760 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1761 move_buffer_data(STp->buffer, transfer - undone); 1762 retry_eot = 1; 1763 if (STps->drv_block >= 0) { 1764 STps->drv_block += (transfer - undone) / 1765 STp->block_size; 1766 } 1767 STps->eof = ST_EOM_OK; 1768 DEBC(printk(ST_DEB_MSG 1769 "%s: Retry write of %d bytes at EOM.\n", 1770 name, STp->buffer->buffer_bytes)); 1771 goto retry_write; 1772 } 1773 else { 1774 /* Either error within data buffered by driver or 1775 failed retry */ 1776 count -= do_count; 1777 blks = do_count = 0; 1778 STps->eof = ST_EOM_ERROR; 1779 STps->drv_block = (-1); /* Too cautious? */ 1780 retval = (-EIO); /* EOM for old data */ 1781 DEBC(printk(ST_DEB_MSG 1782 "%s: EOM with lost data.\n", 1783 name)); 1784 } 1785 } 1786 } else { 1787 count += do_count; 1788 STps->drv_block = (-1); /* Too cautious? */ 1789 retval = STbp->syscall_result; 1790 } 1791 1792 } 1793 1794 if (STps->drv_block >= 0) { 1795 if (STp->block_size == 0) 1796 STps->drv_block += (do_count > 0); 1797 else 1798 STps->drv_block += blks; 1799 } 1800 1801 STbp->buffer_bytes = 0; 1802 STp->dirty = 0; 1803 1804 if (retval || retry_eot) { 1805 if (count < total) 1806 retval = total - count; 1807 goto out; 1808 } 1809 } 1810 1811 if (STps->eof == ST_EOD_1) 1812 STps->eof = ST_EOM_OK; 1813 else if (STps->eof != ST_EOM_OK) 1814 STps->eof = ST_NOEOF; 1815 retval = total - count; 1816 1817 out: 1818 if (SRpnt != NULL) 1819 st_release_request(SRpnt); 1820 release_buffering(STp, 0); 1821 mutex_unlock(&STp->lock); 1822 1823 return retval; 1824 } 1825 1826 /* Read data from the tape. Returns zero in the normal case, one if the 1827 eof status has changed, and the negative error code in case of a 1828 fatal error. Otherwise updates the buffer and the eof state. 1829 1830 Does release user buffer mapping if it is set. 1831 */ 1832 static long read_tape(struct scsi_tape *STp, long count, 1833 struct st_request ** aSRpnt) 1834 { 1835 int transfer, blks, bytes; 1836 unsigned char cmd[MAX_COMMAND_SIZE]; 1837 struct st_request *SRpnt; 1838 struct st_modedef *STm; 1839 struct st_partstat *STps; 1840 struct st_buffer *STbp; 1841 int retval = 0; 1842 char *name = tape_name(STp); 1843 1844 if (count == 0) 1845 return 0; 1846 1847 STm = &(STp->modes[STp->current_mode]); 1848 STps = &(STp->ps[STp->partition]); 1849 if (STps->eof == ST_FM_HIT) 1850 return 1; 1851 STbp = STp->buffer; 1852 1853 if (STp->block_size == 0) 1854 blks = bytes = count; 1855 else { 1856 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1857 blks = (STp->buffer)->buffer_blocks; 1858 bytes = blks * STp->block_size; 1859 } else { 1860 bytes = count; 1861 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1862 bytes = (STp->buffer)->buffer_size; 1863 blks = bytes / STp->block_size; 1864 bytes = blks * STp->block_size; 1865 } 1866 } 1867 1868 memset(cmd, 0, MAX_COMMAND_SIZE); 1869 cmd[0] = READ_6; 1870 cmd[1] = (STp->block_size != 0); 1871 if (!cmd[1] && STp->sili) 1872 cmd[1] |= 2; 1873 cmd[2] = blks >> 16; 1874 cmd[3] = blks >> 8; 1875 cmd[4] = blks; 1876 1877 SRpnt = *aSRpnt; 1878 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1879 STp->device->request_queue->rq_timeout, 1880 MAX_RETRIES, 1); 1881 release_buffering(STp, 1); 1882 *aSRpnt = SRpnt; 1883 if (!SRpnt) 1884 return STbp->syscall_result; 1885 1886 STbp->read_pointer = 0; 1887 STps->at_sm = 0; 1888 1889 /* Something to check */ 1890 if (STbp->syscall_result) { 1891 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1892 1893 retval = 1; 1894 DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1895 name, 1896 SRpnt->sense[0], SRpnt->sense[1], 1897 SRpnt->sense[2], SRpnt->sense[3], 1898 SRpnt->sense[4], SRpnt->sense[5], 1899 SRpnt->sense[6], SRpnt->sense[7])); 1900 if (cmdstatp->have_sense) { 1901 1902 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1903 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1904 1905 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1906 /* Compute the residual count */ 1907 if (cmdstatp->remainder_valid) 1908 transfer = (int)cmdstatp->uremainder64; 1909 else 1910 transfer = 0; 1911 if (STp->block_size == 0 && 1912 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) 1913 transfer = bytes; 1914 1915 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1916 if (STp->block_size == 0) { 1917 if (transfer <= 0) { 1918 if (transfer < 0) 1919 printk(KERN_NOTICE 1920 "%s: Failed to read %d byte block with %d byte transfer.\n", 1921 name, bytes - transfer, bytes); 1922 if (STps->drv_block >= 0) 1923 STps->drv_block += 1; 1924 STbp->buffer_bytes = 0; 1925 return (-ENOMEM); 1926 } 1927 STbp->buffer_bytes = bytes - transfer; 1928 } else { 1929 st_release_request(SRpnt); 1930 SRpnt = *aSRpnt = NULL; 1931 if (transfer == blks) { /* We did not get anything, error */ 1932 printk(KERN_NOTICE "%s: Incorrect block size.\n", name); 1933 if (STps->drv_block >= 0) 1934 STps->drv_block += blks - transfer + 1; 1935 st_int_ioctl(STp, MTBSR, 1); 1936 return (-EIO); 1937 } 1938 /* We have some data, deliver it */ 1939 STbp->buffer_bytes = (blks - transfer) * 1940 STp->block_size; 1941 DEBC(printk(ST_DEB_MSG 1942 "%s: ILI but enough data received %ld %d.\n", 1943 name, count, STbp->buffer_bytes)); 1944 if (STps->drv_block >= 0) 1945 STps->drv_block += 1; 1946 if (st_int_ioctl(STp, MTBSR, 1)) 1947 return (-EIO); 1948 } 1949 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 1950 if (STps->eof != ST_FM_HIT) 1951 STps->eof = ST_FM_HIT; 1952 else 1953 STps->eof = ST_EOD_2; 1954 if (STp->block_size == 0) 1955 STbp->buffer_bytes = 0; 1956 else 1957 STbp->buffer_bytes = 1958 bytes - transfer * STp->block_size; 1959 DEBC(printk(ST_DEB_MSG 1960 "%s: EOF detected (%d bytes read).\n", 1961 name, STbp->buffer_bytes)); 1962 } else if (cmdstatp->flags & SENSE_EOM) { 1963 if (STps->eof == ST_FM) 1964 STps->eof = ST_EOD_1; 1965 else 1966 STps->eof = ST_EOM_OK; 1967 if (STp->block_size == 0) 1968 STbp->buffer_bytes = bytes - transfer; 1969 else 1970 STbp->buffer_bytes = 1971 bytes - transfer * STp->block_size; 1972 1973 DEBC(printk(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", 1974 name, STbp->buffer_bytes)); 1975 } 1976 } 1977 /* end of EOF, EOM, ILI test */ 1978 else { /* nonzero sense key */ 1979 DEBC(printk(ST_DEB_MSG 1980 "%s: Tape error while reading.\n", name)); 1981 STps->drv_block = (-1); 1982 if (STps->eof == ST_FM && 1983 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 1984 DEBC(printk(ST_DEB_MSG 1985 "%s: Zero returned for first BLANK CHECK after EOF.\n", 1986 name)); 1987 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 1988 } else /* Some other extended sense code */ 1989 retval = (-EIO); 1990 } 1991 1992 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 1993 STbp->buffer_bytes = 0; 1994 } 1995 /* End of extended sense test */ 1996 else { /* Non-extended sense */ 1997 retval = STbp->syscall_result; 1998 } 1999 2000 } 2001 /* End of error handling */ 2002 else { /* Read successful */ 2003 STbp->buffer_bytes = bytes; 2004 if (STp->sili) /* In fixed block mode residual is always zero here */ 2005 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2006 } 2007 2008 if (STps->drv_block >= 0) { 2009 if (STp->block_size == 0) 2010 STps->drv_block++; 2011 else 2012 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2013 } 2014 return retval; 2015 } 2016 2017 2018 /* Read command */ 2019 static ssize_t 2020 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2021 { 2022 ssize_t total; 2023 ssize_t retval = 0; 2024 ssize_t i, transfer; 2025 int special, do_dio = 0; 2026 struct st_request *SRpnt = NULL; 2027 struct scsi_tape *STp = filp->private_data; 2028 struct st_modedef *STm; 2029 struct st_partstat *STps; 2030 struct st_buffer *STbp = STp->buffer; 2031 DEB( char *name = tape_name(STp); ) 2032 2033 if (mutex_lock_interruptible(&STp->lock)) 2034 return -ERESTARTSYS; 2035 2036 retval = rw_checks(STp, filp, count); 2037 if (retval || count == 0) 2038 goto out; 2039 2040 STm = &(STp->modes[STp->current_mode]); 2041 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2042 if (!STm->do_read_ahead) { 2043 retval = (-EINVAL); /* Read must be integral number of blocks */ 2044 goto out; 2045 } 2046 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2047 } 2048 2049 STps = &(STp->ps[STp->partition]); 2050 if (STps->rw == ST_WRITING) { 2051 retval = flush_buffer(STp, 0); 2052 if (retval) 2053 goto out; 2054 STps->rw = ST_READING; 2055 } 2056 DEB( 2057 if (debugging && STps->eof != ST_NOEOF) 2058 printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, 2059 STps->eof, STbp->buffer_bytes); 2060 ) /* end DEB */ 2061 2062 retval = setup_buffering(STp, buf, count, 1); 2063 if (retval) 2064 goto out; 2065 do_dio = STbp->do_dio; 2066 2067 if (STbp->buffer_bytes == 0 && 2068 STps->eof >= ST_EOD_1) { 2069 if (STps->eof < ST_EOD) { 2070 STps->eof += 1; 2071 retval = 0; 2072 goto out; 2073 } 2074 retval = (-EIO); /* EOM or Blank Check */ 2075 goto out; 2076 } 2077 2078 if (do_dio) { 2079 /* Check the buffer writability before any tape movement. Don't alter 2080 buffer data. */ 2081 if (copy_from_user(&i, buf, 1) != 0 || 2082 copy_to_user(buf, &i, 1) != 0 || 2083 copy_from_user(&i, buf + count - 1, 1) != 0 || 2084 copy_to_user(buf + count - 1, &i, 1) != 0) { 2085 retval = (-EFAULT); 2086 goto out; 2087 } 2088 } 2089 2090 STps->rw = ST_READING; 2091 2092 2093 /* Loop until enough data in buffer or a special condition found */ 2094 for (total = 0, special = 0; total < count && !special;) { 2095 2096 /* Get new data if the buffer is empty */ 2097 if (STbp->buffer_bytes == 0) { 2098 special = read_tape(STp, count - total, &SRpnt); 2099 if (special < 0) { /* No need to continue read */ 2100 retval = special; 2101 goto out; 2102 } 2103 } 2104 2105 /* Move the data from driver buffer to user buffer */ 2106 if (STbp->buffer_bytes > 0) { 2107 DEB( 2108 if (debugging && STps->eof != ST_NOEOF) 2109 printk(ST_DEB_MSG 2110 "%s: EOF up (%d). Left %d, needed %d.\n", name, 2111 STps->eof, STbp->buffer_bytes, 2112 (int)(count - total)); 2113 ) /* end DEB */ 2114 transfer = STbp->buffer_bytes < count - total ? 2115 STbp->buffer_bytes : count - total; 2116 if (!do_dio) { 2117 i = from_buffer(STbp, buf, transfer); 2118 if (i) { 2119 retval = i; 2120 goto out; 2121 } 2122 } 2123 buf += transfer; 2124 total += transfer; 2125 } 2126 2127 if (STp->block_size == 0) 2128 break; /* Read only one variable length block */ 2129 2130 } /* for (total = 0, special = 0; 2131 total < count && !special; ) */ 2132 2133 /* Change the eof state if no data from tape or buffer */ 2134 if (total == 0) { 2135 if (STps->eof == ST_FM_HIT) { 2136 STps->eof = ST_FM; 2137 STps->drv_block = 0; 2138 if (STps->drv_file >= 0) 2139 STps->drv_file++; 2140 } else if (STps->eof == ST_EOD_1) { 2141 STps->eof = ST_EOD_2; 2142 STps->drv_block = 0; 2143 if (STps->drv_file >= 0) 2144 STps->drv_file++; 2145 } else if (STps->eof == ST_EOD_2) 2146 STps->eof = ST_EOD; 2147 } else if (STps->eof == ST_FM) 2148 STps->eof = ST_NOEOF; 2149 retval = total; 2150 2151 out: 2152 if (SRpnt != NULL) { 2153 st_release_request(SRpnt); 2154 SRpnt = NULL; 2155 } 2156 if (do_dio) { 2157 release_buffering(STp, 1); 2158 STbp->buffer_bytes = 0; 2159 } 2160 mutex_unlock(&STp->lock); 2161 2162 return retval; 2163 } 2164 2165 2166 2167 DEB( 2168 /* Set the driver options */ 2169 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) 2170 { 2171 if (debugging) { 2172 printk(KERN_INFO 2173 "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", 2174 name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, 2175 STm->do_read_ahead); 2176 printk(KERN_INFO 2177 "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", 2178 name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); 2179 printk(KERN_INFO 2180 "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", 2181 name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, 2182 STp->scsi2_logical); 2183 printk(KERN_INFO 2184 "%s: sysv: %d nowait: %d sili: %d nowait_filemark: %d\n", 2185 name, STm->sysv, STp->immediate, STp->sili, 2186 STp->immediate_filemark); 2187 printk(KERN_INFO "%s: debugging: %d\n", 2188 name, debugging); 2189 } 2190 } 2191 ) 2192 2193 2194 static int st_set_options(struct scsi_tape *STp, long options) 2195 { 2196 int value; 2197 long code; 2198 struct st_modedef *STm; 2199 char *name = tape_name(STp); 2200 struct cdev *cd0, *cd1; 2201 struct device *d0, *d1; 2202 2203 STm = &(STp->modes[STp->current_mode]); 2204 if (!STm->defined) { 2205 cd0 = STm->cdevs[0]; 2206 cd1 = STm->cdevs[1]; 2207 d0 = STm->devs[0]; 2208 d1 = STm->devs[1]; 2209 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2210 STm->cdevs[0] = cd0; 2211 STm->cdevs[1] = cd1; 2212 STm->devs[0] = d0; 2213 STm->devs[1] = d1; 2214 modes_defined = 1; 2215 DEBC(printk(ST_DEB_MSG 2216 "%s: Initialized mode %d definition from mode 0\n", 2217 name, STp->current_mode)); 2218 } 2219 2220 code = options & MT_ST_OPTIONS; 2221 if (code == MT_ST_BOOLEANS) { 2222 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2223 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2224 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2225 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2226 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2227 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2228 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2229 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2230 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2231 if ((STp->device)->scsi_level >= SCSI_2) 2232 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2233 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2234 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2235 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2236 STm->sysv = (options & MT_ST_SYSV) != 0; 2237 STp->sili = (options & MT_ST_SILI) != 0; 2238 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2239 st_log_options(STp, STm, name); ) 2240 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2241 value = (code == MT_ST_SETBOOLEANS); 2242 if ((options & MT_ST_BUFFER_WRITES) != 0) 2243 STm->do_buffer_writes = value; 2244 if ((options & MT_ST_ASYNC_WRITES) != 0) 2245 STm->do_async_writes = value; 2246 if ((options & MT_ST_DEF_WRITES) != 0) 2247 STm->defaults_for_writes = value; 2248 if ((options & MT_ST_READ_AHEAD) != 0) 2249 STm->do_read_ahead = value; 2250 if ((options & MT_ST_TWO_FM) != 0) 2251 STp->two_fm = value; 2252 if ((options & MT_ST_FAST_MTEOM) != 0) 2253 STp->fast_mteom = value; 2254 if ((options & MT_ST_AUTO_LOCK) != 0) 2255 STp->do_auto_lock = value; 2256 if ((options & MT_ST_CAN_BSR) != 0) 2257 STp->can_bsr = value; 2258 if ((options & MT_ST_NO_BLKLIMS) != 0) 2259 STp->omit_blklims = value; 2260 if ((STp->device)->scsi_level >= SCSI_2 && 2261 (options & MT_ST_CAN_PARTITIONS) != 0) 2262 STp->can_partitions = value; 2263 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2264 STp->scsi2_logical = value; 2265 if ((options & MT_ST_NOWAIT) != 0) 2266 STp->immediate = value; 2267 if ((options & MT_ST_NOWAIT_EOF) != 0) 2268 STp->immediate_filemark = value; 2269 if ((options & MT_ST_SYSV) != 0) 2270 STm->sysv = value; 2271 if ((options & MT_ST_SILI) != 0) 2272 STp->sili = value; 2273 DEB( 2274 if ((options & MT_ST_DEBUGGING) != 0) 2275 debugging = value; 2276 st_log_options(STp, STm, name); ) 2277 } else if (code == MT_ST_WRITE_THRESHOLD) { 2278 /* Retained for compatibility */ 2279 } else if (code == MT_ST_DEF_BLKSIZE) { 2280 value = (options & ~MT_ST_OPTIONS); 2281 if (value == ~MT_ST_OPTIONS) { 2282 STm->default_blksize = (-1); 2283 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); 2284 } else { 2285 STm->default_blksize = value; 2286 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", 2287 name, STm->default_blksize)); 2288 if (STp->ready == ST_READY) { 2289 STp->blksize_changed = 0; 2290 set_mode_densblk(STp, STm); 2291 } 2292 } 2293 } else if (code == MT_ST_TIMEOUTS) { 2294 value = (options & ~MT_ST_OPTIONS); 2295 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2296 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2297 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, 2298 (value & ~MT_ST_SET_LONG_TIMEOUT))); 2299 } else { 2300 blk_queue_rq_timeout(STp->device->request_queue, 2301 value * HZ); 2302 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", 2303 name, value) ); 2304 } 2305 } else if (code == MT_ST_SET_CLN) { 2306 value = (options & ~MT_ST_OPTIONS) & 0xff; 2307 if (value != 0 && 2308 (value < EXTENDED_SENSE_START || 2309 value >= SCSI_SENSE_BUFFERSIZE)) 2310 return (-EINVAL); 2311 STp->cln_mode = value; 2312 STp->cln_sense_mask = (options >> 8) & 0xff; 2313 STp->cln_sense_value = (options >> 16) & 0xff; 2314 printk(KERN_INFO 2315 "%s: Cleaning request mode %d, mask %02x, value %02x\n", 2316 name, value, STp->cln_sense_mask, STp->cln_sense_value); 2317 } else if (code == MT_ST_DEF_OPTIONS) { 2318 code = (options & ~MT_ST_CLEAR_DEFAULT); 2319 value = (options & MT_ST_CLEAR_DEFAULT); 2320 if (code == MT_ST_DEF_DENSITY) { 2321 if (value == MT_ST_CLEAR_DEFAULT) { 2322 STm->default_density = (-1); 2323 DEBC( printk(KERN_INFO "%s: Density default disabled.\n", 2324 name)); 2325 } else { 2326 STm->default_density = value & 0xff; 2327 DEBC( printk(KERN_INFO "%s: Density default set to %x\n", 2328 name, STm->default_density)); 2329 if (STp->ready == ST_READY) { 2330 STp->density_changed = 0; 2331 set_mode_densblk(STp, STm); 2332 } 2333 } 2334 } else if (code == MT_ST_DEF_DRVBUFFER) { 2335 if (value == MT_ST_CLEAR_DEFAULT) { 2336 STp->default_drvbuffer = 0xff; 2337 DEBC( printk(KERN_INFO 2338 "%s: Drive buffer default disabled.\n", name)); 2339 } else { 2340 STp->default_drvbuffer = value & 7; 2341 DEBC( printk(KERN_INFO 2342 "%s: Drive buffer default set to %x\n", 2343 name, STp->default_drvbuffer)); 2344 if (STp->ready == ST_READY) 2345 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2346 } 2347 } else if (code == MT_ST_DEF_COMPRESSION) { 2348 if (value == MT_ST_CLEAR_DEFAULT) { 2349 STm->default_compression = ST_DONT_TOUCH; 2350 DEBC( printk(KERN_INFO 2351 "%s: Compression default disabled.\n", name)); 2352 } else { 2353 if ((value & 0xff00) != 0) { 2354 STp->c_algo = (value & 0xff00) >> 8; 2355 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", 2356 name, STp->c_algo)); 2357 } 2358 if ((value & 0xff) != 0xff) { 2359 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2360 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", 2361 name, (value & 1))); 2362 if (STp->ready == ST_READY) { 2363 STp->compression_changed = 0; 2364 st_compression(STp, (STm->default_compression == ST_YES)); 2365 } 2366 } 2367 } 2368 } 2369 } else 2370 return (-EIO); 2371 2372 return 0; 2373 } 2374 2375 #define MODE_HEADER_LENGTH 4 2376 2377 /* Mode header and page byte offsets */ 2378 #define MH_OFF_DATA_LENGTH 0 2379 #define MH_OFF_MEDIUM_TYPE 1 2380 #define MH_OFF_DEV_SPECIFIC 2 2381 #define MH_OFF_BDESCS_LENGTH 3 2382 #define MP_OFF_PAGE_NBR 0 2383 #define MP_OFF_PAGE_LENGTH 1 2384 2385 /* Mode header and page bit masks */ 2386 #define MH_BIT_WP 0x80 2387 #define MP_MSK_PAGE_NBR 0x3f 2388 2389 /* Don't return block descriptors */ 2390 #define MODE_SENSE_OMIT_BDESCS 0x08 2391 2392 #define MODE_SELECT_PAGE_FORMAT 0x10 2393 2394 /* Read a mode page into the tape buffer. The block descriptors are included 2395 if incl_block_descs is true. The page control is ored to the page number 2396 parameter, if necessary. */ 2397 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2398 { 2399 unsigned char cmd[MAX_COMMAND_SIZE]; 2400 struct st_request *SRpnt; 2401 2402 memset(cmd, 0, MAX_COMMAND_SIZE); 2403 cmd[0] = MODE_SENSE; 2404 if (omit_block_descs) 2405 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2406 cmd[2] = page; 2407 cmd[4] = 255; 2408 2409 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2410 STp->device->request_queue->rq_timeout, 0, 1); 2411 if (SRpnt == NULL) 2412 return (STp->buffer)->syscall_result; 2413 2414 st_release_request(SRpnt); 2415 2416 return STp->buffer->syscall_result; 2417 } 2418 2419 2420 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2421 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2422 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2423 { 2424 int pgo; 2425 unsigned char cmd[MAX_COMMAND_SIZE]; 2426 struct st_request *SRpnt; 2427 int timeout; 2428 2429 memset(cmd, 0, MAX_COMMAND_SIZE); 2430 cmd[0] = MODE_SELECT; 2431 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2432 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2433 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2434 2435 /* Clear reserved fields */ 2436 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2437 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2438 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2439 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2440 2441 timeout = slow ? 2442 STp->long_timeout : STp->device->request_queue->rq_timeout; 2443 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2444 timeout, 0, 1); 2445 if (SRpnt == NULL) 2446 return (STp->buffer)->syscall_result; 2447 2448 st_release_request(SRpnt); 2449 2450 return STp->buffer->syscall_result; 2451 } 2452 2453 2454 #define COMPRESSION_PAGE 0x0f 2455 #define COMPRESSION_PAGE_LENGTH 16 2456 2457 #define CP_OFF_DCE_DCC 2 2458 #define CP_OFF_C_ALGO 7 2459 2460 #define DCE_MASK 0x80 2461 #define DCC_MASK 0x40 2462 #define RED_MASK 0x60 2463 2464 2465 /* Control the compression with mode page 15. Algorithm not changed if zero. 2466 2467 The block descriptors are read and written because Sony SDT-7000 does not 2468 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2469 Including block descriptors should not cause any harm to other drives. */ 2470 2471 static int st_compression(struct scsi_tape * STp, int state) 2472 { 2473 int retval; 2474 int mpoffs; /* Offset to mode page start */ 2475 unsigned char *b_data = (STp->buffer)->b_data; 2476 DEB( char *name = tape_name(STp); ) 2477 2478 if (STp->ready != ST_READY) 2479 return (-EIO); 2480 2481 /* Read the current page contents */ 2482 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2483 if (retval) { 2484 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", 2485 name)); 2486 return (-EIO); 2487 } 2488 2489 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2490 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, 2491 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); 2492 2493 /* Check if compression can be changed */ 2494 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2495 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); 2496 return (-EIO); 2497 } 2498 2499 /* Do the change */ 2500 if (state) { 2501 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2502 if (STp->c_algo != 0) 2503 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2504 } 2505 else { 2506 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2507 if (STp->c_algo != 0) 2508 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2509 } 2510 2511 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2512 if (retval) { 2513 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); 2514 return (-EIO); 2515 } 2516 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", 2517 name, state)); 2518 2519 STp->compression_changed = 1; 2520 return 0; 2521 } 2522 2523 2524 /* Process the load and unload commands (does unload if the load code is zero) */ 2525 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2526 { 2527 int retval = (-EIO), timeout; 2528 DEB( char *name = tape_name(STp); ) 2529 unsigned char cmd[MAX_COMMAND_SIZE]; 2530 struct st_partstat *STps; 2531 struct st_request *SRpnt; 2532 2533 if (STp->ready != ST_READY && !load_code) { 2534 if (STp->ready == ST_NO_TAPE) 2535 return (-ENOMEDIUM); 2536 else 2537 return (-EIO); 2538 } 2539 2540 memset(cmd, 0, MAX_COMMAND_SIZE); 2541 cmd[0] = START_STOP; 2542 if (load_code) 2543 cmd[4] |= 1; 2544 /* 2545 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2546 */ 2547 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2548 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2549 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", 2550 name, (cmd[4]) ? "" : "un", 2551 load_code - MT_ST_HPLOADER_OFFSET)); 2552 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2553 } 2554 if (STp->immediate) { 2555 cmd[1] = 1; /* Don't wait for completion */ 2556 timeout = STp->device->request_queue->rq_timeout; 2557 } 2558 else 2559 timeout = STp->long_timeout; 2560 2561 DEBC( 2562 if (!load_code) 2563 printk(ST_DEB_MSG "%s: Unloading tape.\n", name); 2564 else 2565 printk(ST_DEB_MSG "%s: Loading tape.\n", name); 2566 ); 2567 2568 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2569 timeout, MAX_RETRIES, 1); 2570 if (!SRpnt) 2571 return (STp->buffer)->syscall_result; 2572 2573 retval = (STp->buffer)->syscall_result; 2574 st_release_request(SRpnt); 2575 2576 if (!retval) { /* SCSI command successful */ 2577 2578 if (!load_code) { 2579 STp->rew_at_close = 0; 2580 STp->ready = ST_NO_TAPE; 2581 } 2582 else { 2583 STp->rew_at_close = STp->autorew_dev; 2584 retval = check_tape(STp, filp); 2585 if (retval > 0) 2586 retval = 0; 2587 } 2588 } 2589 else { 2590 STps = &(STp->ps[STp->partition]); 2591 STps->drv_file = STps->drv_block = (-1); 2592 } 2593 2594 return retval; 2595 } 2596 2597 #if DEBUG 2598 #define ST_DEB_FORWARD 0 2599 #define ST_DEB_BACKWARD 1 2600 static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) 2601 { 2602 s32 sc; 2603 2604 sc = cmd[2] & 0x80 ? 0xff000000 : 0; 2605 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; 2606 if (direction) 2607 sc = -sc; 2608 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, 2609 direction ? "backward" : "forward", sc, units); 2610 } 2611 #endif 2612 2613 2614 /* Internal ioctl function */ 2615 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2616 { 2617 int timeout; 2618 long ltmp; 2619 int ioctl_result; 2620 int chg_eof = 1; 2621 unsigned char cmd[MAX_COMMAND_SIZE]; 2622 struct st_request *SRpnt; 2623 struct st_partstat *STps; 2624 int fileno, blkno, at_sm, undone; 2625 int datalen = 0, direction = DMA_NONE; 2626 char *name = tape_name(STp); 2627 2628 WARN_ON(STp->buffer->do_dio != 0); 2629 if (STp->ready != ST_READY) { 2630 if (STp->ready == ST_NO_TAPE) 2631 return (-ENOMEDIUM); 2632 else 2633 return (-EIO); 2634 } 2635 timeout = STp->long_timeout; 2636 STps = &(STp->ps[STp->partition]); 2637 fileno = STps->drv_file; 2638 blkno = STps->drv_block; 2639 at_sm = STps->at_sm; 2640 2641 memset(cmd, 0, MAX_COMMAND_SIZE); 2642 switch (cmd_in) { 2643 case MTFSFM: 2644 chg_eof = 0; /* Changed from the FSF after this */ 2645 case MTFSF: 2646 cmd[0] = SPACE; 2647 cmd[1] = 0x01; /* Space FileMarks */ 2648 cmd[2] = (arg >> 16); 2649 cmd[3] = (arg >> 8); 2650 cmd[4] = arg; 2651 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) 2652 if (fileno >= 0) 2653 fileno += arg; 2654 blkno = 0; 2655 at_sm &= (arg == 0); 2656 break; 2657 case MTBSFM: 2658 chg_eof = 0; /* Changed from the FSF after this */ 2659 case MTBSF: 2660 cmd[0] = SPACE; 2661 cmd[1] = 0x01; /* Space FileMarks */ 2662 ltmp = (-arg); 2663 cmd[2] = (ltmp >> 16); 2664 cmd[3] = (ltmp >> 8); 2665 cmd[4] = ltmp; 2666 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) 2667 if (fileno >= 0) 2668 fileno -= arg; 2669 blkno = (-1); /* We can't know the block number */ 2670 at_sm &= (arg == 0); 2671 break; 2672 case MTFSR: 2673 cmd[0] = SPACE; 2674 cmd[1] = 0x00; /* Space Blocks */ 2675 cmd[2] = (arg >> 16); 2676 cmd[3] = (arg >> 8); 2677 cmd[4] = arg; 2678 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) 2679 if (blkno >= 0) 2680 blkno += arg; 2681 at_sm &= (arg == 0); 2682 break; 2683 case MTBSR: 2684 cmd[0] = SPACE; 2685 cmd[1] = 0x00; /* Space Blocks */ 2686 ltmp = (-arg); 2687 cmd[2] = (ltmp >> 16); 2688 cmd[3] = (ltmp >> 8); 2689 cmd[4] = ltmp; 2690 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) 2691 if (blkno >= 0) 2692 blkno -= arg; 2693 at_sm &= (arg == 0); 2694 break; 2695 case MTFSS: 2696 cmd[0] = SPACE; 2697 cmd[1] = 0x04; /* Space Setmarks */ 2698 cmd[2] = (arg >> 16); 2699 cmd[3] = (arg >> 8); 2700 cmd[4] = arg; 2701 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) 2702 if (arg != 0) { 2703 blkno = fileno = (-1); 2704 at_sm = 1; 2705 } 2706 break; 2707 case MTBSS: 2708 cmd[0] = SPACE; 2709 cmd[1] = 0x04; /* Space Setmarks */ 2710 ltmp = (-arg); 2711 cmd[2] = (ltmp >> 16); 2712 cmd[3] = (ltmp >> 8); 2713 cmd[4] = ltmp; 2714 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) 2715 if (arg != 0) { 2716 blkno = fileno = (-1); 2717 at_sm = 1; 2718 } 2719 break; 2720 case MTWEOF: 2721 case MTWEOFI: 2722 case MTWSM: 2723 if (STp->write_prot) 2724 return (-EACCES); 2725 cmd[0] = WRITE_FILEMARKS; 2726 if (cmd_in == MTWSM) 2727 cmd[1] = 2; 2728 if (cmd_in == MTWEOFI || 2729 (cmd_in == MTWEOF && STp->immediate_filemark)) 2730 cmd[1] |= 1; 2731 cmd[2] = (arg >> 16); 2732 cmd[3] = (arg >> 8); 2733 cmd[4] = arg; 2734 timeout = STp->device->request_queue->rq_timeout; 2735 DEBC( 2736 if (cmd_in != MTWSM) 2737 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, 2738 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); 2739 else 2740 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, 2741 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); 2742 ) 2743 if (fileno >= 0) 2744 fileno += arg; 2745 blkno = 0; 2746 at_sm = (cmd_in == MTWSM); 2747 break; 2748 case MTREW: 2749 cmd[0] = REZERO_UNIT; 2750 if (STp->immediate) { 2751 cmd[1] = 1; /* Don't wait for completion */ 2752 timeout = STp->device->request_queue->rq_timeout; 2753 } 2754 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); 2755 fileno = blkno = at_sm = 0; 2756 break; 2757 case MTNOP: 2758 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); 2759 return 0; /* Should do something ? */ 2760 break; 2761 case MTRETEN: 2762 cmd[0] = START_STOP; 2763 if (STp->immediate) { 2764 cmd[1] = 1; /* Don't wait for completion */ 2765 timeout = STp->device->request_queue->rq_timeout; 2766 } 2767 cmd[4] = 3; 2768 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); 2769 fileno = blkno = at_sm = 0; 2770 break; 2771 case MTEOM: 2772 if (!STp->fast_mteom) { 2773 /* space to the end of tape */ 2774 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2775 fileno = STps->drv_file; 2776 if (STps->eof >= ST_EOD_1) 2777 return 0; 2778 /* The next lines would hide the number of spaced FileMarks 2779 That's why I inserted the previous lines. I had no luck 2780 with detecting EOM with FSF, so we go now to EOM. 2781 Joerg Weule */ 2782 } else 2783 fileno = (-1); 2784 cmd[0] = SPACE; 2785 cmd[1] = 3; 2786 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", 2787 name)); 2788 blkno = -1; 2789 at_sm = 0; 2790 break; 2791 case MTERASE: 2792 if (STp->write_prot) 2793 return (-EACCES); 2794 cmd[0] = ERASE; 2795 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2796 if (STp->immediate) { 2797 cmd[1] |= 2; /* Don't wait for completion */ 2798 timeout = STp->device->request_queue->rq_timeout; 2799 } 2800 else 2801 timeout = STp->long_timeout * 8; 2802 2803 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); 2804 fileno = blkno = at_sm = 0; 2805 break; 2806 case MTSETBLK: /* Set block length */ 2807 case MTSETDENSITY: /* Set tape density */ 2808 case MTSETDRVBUFFER: /* Set drive buffering */ 2809 case SET_DENS_AND_BLK: /* Set density and block size */ 2810 chg_eof = 0; 2811 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2812 return (-EIO); /* Not allowed if data in buffer */ 2813 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2814 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2815 STp->max_block > 0 && 2816 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2817 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2818 printk(KERN_WARNING "%s: Illegal block size.\n", name); 2819 return (-EINVAL); 2820 } 2821 cmd[0] = MODE_SELECT; 2822 if ((STp->use_pf & USE_PF)) 2823 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2824 cmd[4] = datalen = 12; 2825 direction = DMA_TO_DEVICE; 2826 2827 memset((STp->buffer)->b_data, 0, 12); 2828 if (cmd_in == MTSETDRVBUFFER) 2829 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2830 else 2831 (STp->buffer)->b_data[2] = 2832 STp->drv_buffer << 4; 2833 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2834 if (cmd_in == MTSETDENSITY) { 2835 (STp->buffer)->b_data[4] = arg; 2836 STp->density_changed = 1; /* At least we tried ;-) */ 2837 } else if (cmd_in == SET_DENS_AND_BLK) 2838 (STp->buffer)->b_data[4] = arg >> 24; 2839 else 2840 (STp->buffer)->b_data[4] = STp->density; 2841 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2842 ltmp = arg & MT_ST_BLKSIZE_MASK; 2843 if (cmd_in == MTSETBLK) 2844 STp->blksize_changed = 1; /* At least we tried ;-) */ 2845 } else 2846 ltmp = STp->block_size; 2847 (STp->buffer)->b_data[9] = (ltmp >> 16); 2848 (STp->buffer)->b_data[10] = (ltmp >> 8); 2849 (STp->buffer)->b_data[11] = ltmp; 2850 timeout = STp->device->request_queue->rq_timeout; 2851 DEBC( 2852 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2853 printk(ST_DEB_MSG 2854 "%s: Setting block size to %d bytes.\n", name, 2855 (STp->buffer)->b_data[9] * 65536 + 2856 (STp->buffer)->b_data[10] * 256 + 2857 (STp->buffer)->b_data[11]); 2858 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2859 printk(ST_DEB_MSG 2860 "%s: Setting density code to %x.\n", name, 2861 (STp->buffer)->b_data[4]); 2862 if (cmd_in == MTSETDRVBUFFER) 2863 printk(ST_DEB_MSG 2864 "%s: Setting drive buffer code to %d.\n", name, 2865 ((STp->buffer)->b_data[2] >> 4) & 7); 2866 ) 2867 break; 2868 default: 2869 return (-ENOSYS); 2870 } 2871 2872 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2873 timeout, MAX_RETRIES, 1); 2874 if (!SRpnt) 2875 return (STp->buffer)->syscall_result; 2876 2877 ioctl_result = (STp->buffer)->syscall_result; 2878 2879 if (!ioctl_result) { /* SCSI command successful */ 2880 st_release_request(SRpnt); 2881 SRpnt = NULL; 2882 STps->drv_block = blkno; 2883 STps->drv_file = fileno; 2884 STps->at_sm = at_sm; 2885 2886 if (cmd_in == MTBSFM) 2887 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2888 else if (cmd_in == MTFSFM) 2889 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2890 2891 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2892 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2893 if (STp->block_size != 0) { 2894 (STp->buffer)->buffer_blocks = 2895 (STp->buffer)->buffer_size / STp->block_size; 2896 } 2897 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2898 if (cmd_in == SET_DENS_AND_BLK) 2899 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2900 } else if (cmd_in == MTSETDRVBUFFER) 2901 STp->drv_buffer = (arg & 7); 2902 else if (cmd_in == MTSETDENSITY) 2903 STp->density = arg; 2904 2905 if (cmd_in == MTEOM) 2906 STps->eof = ST_EOD; 2907 else if (cmd_in == MTFSF) 2908 STps->eof = ST_FM; 2909 else if (chg_eof) 2910 STps->eof = ST_NOEOF; 2911 2912 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 2913 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 2914 } else { /* SCSI command was not completely successful. Don't return 2915 from this block without releasing the SCSI command block! */ 2916 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 2917 2918 if (cmdstatp->flags & SENSE_EOM) { 2919 if (cmd_in != MTBSF && cmd_in != MTBSFM && 2920 cmd_in != MTBSR && cmd_in != MTBSS) 2921 STps->eof = ST_EOM_OK; 2922 STps->drv_block = 0; 2923 } 2924 2925 if (cmdstatp->remainder_valid) 2926 undone = (int)cmdstatp->uremainder64; 2927 else 2928 undone = 0; 2929 2930 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 2931 cmdstatp->have_sense && 2932 (cmdstatp->flags & SENSE_EOM)) { 2933 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 2934 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 2935 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 2936 STps->eof = ST_NOEOF; 2937 } else { /* Writing EOF(s) failed */ 2938 if (fileno >= 0) 2939 fileno -= undone; 2940 if (undone < arg) 2941 STps->eof = ST_NOEOF; 2942 } 2943 STps->drv_file = fileno; 2944 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 2945 if (fileno >= 0) 2946 STps->drv_file = fileno - undone; 2947 else 2948 STps->drv_file = fileno; 2949 STps->drv_block = -1; 2950 STps->eof = ST_NOEOF; 2951 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 2952 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 2953 undone = (-undone); 2954 if (STps->drv_file >= 0) 2955 STps->drv_file = fileno + undone; 2956 STps->drv_block = 0; 2957 STps->eof = ST_NOEOF; 2958 } else if (cmd_in == MTFSR) { 2959 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 2960 if (STps->drv_file >= 0) 2961 STps->drv_file++; 2962 STps->drv_block = 0; 2963 STps->eof = ST_FM; 2964 } else { 2965 if (blkno >= undone) 2966 STps->drv_block = blkno - undone; 2967 else 2968 STps->drv_block = (-1); 2969 STps->eof = ST_NOEOF; 2970 } 2971 } else if (cmd_in == MTBSR) { 2972 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 2973 STps->drv_file--; 2974 STps->drv_block = (-1); 2975 } else { 2976 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 2977 undone = (-undone); 2978 if (STps->drv_block >= 0) 2979 STps->drv_block = blkno + undone; 2980 } 2981 STps->eof = ST_NOEOF; 2982 } else if (cmd_in == MTEOM) { 2983 STps->drv_file = (-1); 2984 STps->drv_block = (-1); 2985 STps->eof = ST_EOD; 2986 } else if (cmd_in == MTSETBLK || 2987 cmd_in == MTSETDENSITY || 2988 cmd_in == MTSETDRVBUFFER || 2989 cmd_in == SET_DENS_AND_BLK) { 2990 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 2991 !(STp->use_pf & PF_TESTED)) { 2992 /* Try the other possible state of Page Format if not 2993 already tried */ 2994 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 2995 st_release_request(SRpnt); 2996 SRpnt = NULL; 2997 return st_int_ioctl(STp, cmd_in, arg); 2998 } 2999 } else if (chg_eof) 3000 STps->eof = ST_NOEOF; 3001 3002 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3003 STps->eof = ST_EOD; 3004 3005 st_release_request(SRpnt); 3006 SRpnt = NULL; 3007 } 3008 3009 return ioctl_result; 3010 } 3011 3012 3013 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3014 structure. */ 3015 3016 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3017 int logical) 3018 { 3019 int result; 3020 unsigned char scmd[MAX_COMMAND_SIZE]; 3021 struct st_request *SRpnt; 3022 DEB( char *name = tape_name(STp); ) 3023 3024 if (STp->ready != ST_READY) 3025 return (-EIO); 3026 3027 memset(scmd, 0, MAX_COMMAND_SIZE); 3028 if ((STp->device)->scsi_level < SCSI_2) { 3029 scmd[0] = QFA_REQUEST_BLOCK; 3030 scmd[4] = 3; 3031 } else { 3032 scmd[0] = READ_POSITION; 3033 if (!logical && !STp->scsi2_logical) 3034 scmd[1] = 1; 3035 } 3036 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3037 STp->device->request_queue->rq_timeout, 3038 MAX_READY_RETRIES, 1); 3039 if (!SRpnt) 3040 return (STp->buffer)->syscall_result; 3041 3042 if ((STp->buffer)->syscall_result != 0 || 3043 (STp->device->scsi_level >= SCSI_2 && 3044 ((STp->buffer)->b_data[0] & 4) != 0)) { 3045 *block = *partition = 0; 3046 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); 3047 result = (-EIO); 3048 } else { 3049 result = 0; 3050 if ((STp->device)->scsi_level < SCSI_2) { 3051 *block = ((STp->buffer)->b_data[0] << 16) 3052 + ((STp->buffer)->b_data[1] << 8) 3053 + (STp->buffer)->b_data[2]; 3054 *partition = 0; 3055 } else { 3056 *block = ((STp->buffer)->b_data[4] << 24) 3057 + ((STp->buffer)->b_data[5] << 16) 3058 + ((STp->buffer)->b_data[6] << 8) 3059 + (STp->buffer)->b_data[7]; 3060 *partition = (STp->buffer)->b_data[1]; 3061 if (((STp->buffer)->b_data[0] & 0x80) && 3062 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3063 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3064 } 3065 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, 3066 *block, *partition)); 3067 } 3068 st_release_request(SRpnt); 3069 SRpnt = NULL; 3070 3071 return result; 3072 } 3073 3074 3075 /* Set the tape block and partition. Negative partition means that only the 3076 block should be set in vendor specific way. */ 3077 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3078 int logical) 3079 { 3080 struct st_partstat *STps; 3081 int result, p; 3082 unsigned int blk; 3083 int timeout; 3084 unsigned char scmd[MAX_COMMAND_SIZE]; 3085 struct st_request *SRpnt; 3086 DEB( char *name = tape_name(STp); ) 3087 3088 if (STp->ready != ST_READY) 3089 return (-EIO); 3090 timeout = STp->long_timeout; 3091 STps = &(STp->ps[STp->partition]); 3092 3093 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", 3094 name, block, partition)); 3095 DEB(if (partition < 0) 3096 return (-EIO); ) 3097 3098 /* Update the location at the partition we are leaving */ 3099 if ((!STp->can_partitions && partition != 0) || 3100 partition >= ST_NBR_PARTITIONS) 3101 return (-EINVAL); 3102 if (partition != STp->partition) { 3103 if (get_location(STp, &blk, &p, 1)) 3104 STps->last_block_valid = 0; 3105 else { 3106 STps->last_block_valid = 1; 3107 STps->last_block_visited = blk; 3108 DEBC(printk(ST_DEB_MSG 3109 "%s: Visited block %d for partition %d saved.\n", 3110 name, blk, STp->partition)); 3111 } 3112 } 3113 3114 memset(scmd, 0, MAX_COMMAND_SIZE); 3115 if ((STp->device)->scsi_level < SCSI_2) { 3116 scmd[0] = QFA_SEEK_BLOCK; 3117 scmd[2] = (block >> 16); 3118 scmd[3] = (block >> 8); 3119 scmd[4] = block; 3120 scmd[5] = 0; 3121 } else { 3122 scmd[0] = SEEK_10; 3123 scmd[3] = (block >> 24); 3124 scmd[4] = (block >> 16); 3125 scmd[5] = (block >> 8); 3126 scmd[6] = block; 3127 if (!logical && !STp->scsi2_logical) 3128 scmd[1] = 4; 3129 if (STp->partition != partition) { 3130 scmd[1] |= 2; 3131 scmd[8] = partition; 3132 DEBC(printk(ST_DEB_MSG 3133 "%s: Trying to change partition from %d to %d\n", 3134 name, STp->partition, partition)); 3135 } 3136 } 3137 if (STp->immediate) { 3138 scmd[1] |= 1; /* Don't wait for completion */ 3139 timeout = STp->device->request_queue->rq_timeout; 3140 } 3141 3142 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3143 timeout, MAX_READY_RETRIES, 1); 3144 if (!SRpnt) 3145 return (STp->buffer)->syscall_result; 3146 3147 STps->drv_block = STps->drv_file = (-1); 3148 STps->eof = ST_NOEOF; 3149 if ((STp->buffer)->syscall_result != 0) { 3150 result = (-EIO); 3151 if (STp->can_partitions && 3152 (STp->device)->scsi_level >= SCSI_2 && 3153 (p = find_partition(STp)) >= 0) 3154 STp->partition = p; 3155 } else { 3156 if (STp->can_partitions) { 3157 STp->partition = partition; 3158 STps = &(STp->ps[partition]); 3159 if (!STps->last_block_valid || 3160 STps->last_block_visited != block) { 3161 STps->at_sm = 0; 3162 STps->rw = ST_IDLE; 3163 } 3164 } else 3165 STps->at_sm = 0; 3166 if (block == 0) 3167 STps->drv_block = STps->drv_file = 0; 3168 result = 0; 3169 } 3170 3171 st_release_request(SRpnt); 3172 SRpnt = NULL; 3173 3174 return result; 3175 } 3176 3177 3178 /* Find the current partition number for the drive status. Called from open and 3179 returns either partition number of negative error code. */ 3180 static int find_partition(struct scsi_tape *STp) 3181 { 3182 int i, partition; 3183 unsigned int block; 3184 3185 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3186 return i; 3187 if (partition >= ST_NBR_PARTITIONS) 3188 return (-EIO); 3189 return partition; 3190 } 3191 3192 3193 /* Change the partition if necessary */ 3194 static int switch_partition(struct scsi_tape *STp) 3195 { 3196 struct st_partstat *STps; 3197 3198 if (STp->partition == STp->new_partition) 3199 return 0; 3200 STps = &(STp->ps[STp->new_partition]); 3201 if (!STps->last_block_valid) 3202 STps->last_block_visited = 0; 3203 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3204 } 3205 3206 /* Functions for reading and writing the medium partition mode page. */ 3207 3208 #define PART_PAGE 0x11 3209 #define PART_PAGE_FIXED_LENGTH 8 3210 3211 #define PP_OFF_MAX_ADD_PARTS 2 3212 #define PP_OFF_NBR_ADD_PARTS 3 3213 #define PP_OFF_FLAGS 4 3214 #define PP_OFF_PART_UNITS 6 3215 #define PP_OFF_RESERVED 7 3216 3217 #define PP_BIT_IDP 0x20 3218 #define PP_MSK_PSUM_MB 0x10 3219 3220 /* Get the number of partitions on the tape. As a side effect reads the 3221 mode page into the tape buffer. */ 3222 static int nbr_partitions(struct scsi_tape *STp) 3223 { 3224 int result; 3225 DEB( char *name = tape_name(STp); ) 3226 3227 if (STp->ready != ST_READY) 3228 return (-EIO); 3229 3230 result = read_mode_page(STp, PART_PAGE, 1); 3231 3232 if (result) { 3233 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", 3234 name)); 3235 result = (-EIO); 3236 } else { 3237 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3238 PP_OFF_NBR_ADD_PARTS] + 1; 3239 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); 3240 } 3241 3242 return result; 3243 } 3244 3245 3246 /* Partition the tape into two partitions if size > 0 or one partition if 3247 size == 0. 3248 3249 The block descriptors are read and written because Sony SDT-7000 does not 3250 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3251 3252 My HP C1533A drive returns only one partition size field. This is used to 3253 set the size of partition 1. There is no size field for the default partition. 3254 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3255 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3256 The following algorithm is used to accommodate both drives: if the number of 3257 partition size fields is greater than the maximum number of additional partitions 3258 in the mode page, the second field is used. Otherwise the first field is used. 3259 3260 For Seagate DDS drives the page length must be 8 when no partitions is defined 3261 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3262 is acceptable also to some other old drives and enforced if the first partition 3263 size field is used for the first additional partition size. 3264 */ 3265 static int partition_tape(struct scsi_tape *STp, int size) 3266 { 3267 char *name = tape_name(STp); 3268 int result; 3269 int pgo, psd_cnt, psdo; 3270 unsigned char *bp; 3271 3272 result = read_mode_page(STp, PART_PAGE, 0); 3273 if (result) { 3274 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); 3275 return result; 3276 } 3277 /* The mode page is in the buffer. Let's modify it and write it. */ 3278 bp = (STp->buffer)->b_data; 3279 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3280 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", 3281 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); 3282 3283 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3284 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3285 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { 3286 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ 3287 psdo += 2; 3288 } 3289 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3290 3291 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, 3292 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3293 bp[pgo + PP_OFF_NBR_ADD_PARTS])); 3294 3295 if (size <= 0) { 3296 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3297 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3298 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3299 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", 3300 name)); 3301 } else { 3302 bp[psdo] = (size >> 8) & 0xff; 3303 bp[psdo + 1] = size & 0xff; 3304 bp[pgo + 3] = 1; 3305 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3306 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3307 DEBC(printk(ST_DEB_MSG 3308 "%s: Formatting tape with two partitions (1 = %d MB).\n", 3309 name, size)); 3310 } 3311 bp[pgo + PP_OFF_PART_UNITS] = 0; 3312 bp[pgo + PP_OFF_RESERVED] = 0; 3313 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; 3314 3315 result = write_mode_page(STp, PART_PAGE, 1); 3316 if (result) { 3317 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); 3318 result = (-EIO); 3319 } 3320 3321 return result; 3322 } 3323 3324 3325 3326 /* The ioctl command */ 3327 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3328 { 3329 int i, cmd_nr, cmd_type, bt; 3330 int retval = 0; 3331 unsigned int blk; 3332 struct scsi_tape *STp = file->private_data; 3333 struct st_modedef *STm; 3334 struct st_partstat *STps; 3335 char *name = tape_name(STp); 3336 void __user *p = (void __user *)arg; 3337 3338 if (mutex_lock_interruptible(&STp->lock)) 3339 return -ERESTARTSYS; 3340 3341 DEB( 3342 if (debugging && !STp->in_use) { 3343 printk(ST_DEB_MSG "%s: Incorrect device.\n", name); 3344 retval = (-EIO); 3345 goto out; 3346 } ) /* end DEB */ 3347 3348 STm = &(STp->modes[STp->current_mode]); 3349 STps = &(STp->ps[STp->partition]); 3350 3351 /* 3352 * If we are in the middle of error recovery, don't let anyone 3353 * else try and use this device. Also, if error recovery fails, it 3354 * may try and take the device offline, in which case all further 3355 * access to the device is prohibited. 3356 */ 3357 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, 3358 file->f_flags & O_NDELAY); 3359 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) 3360 goto out; 3361 retval = 0; 3362 3363 cmd_type = _IOC_TYPE(cmd_in); 3364 cmd_nr = _IOC_NR(cmd_in); 3365 3366 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3367 struct mtop mtc; 3368 3369 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3370 retval = (-EINVAL); 3371 goto out; 3372 } 3373 3374 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3375 if (i) { 3376 retval = (-EFAULT); 3377 goto out; 3378 } 3379 3380 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3381 printk(KERN_WARNING 3382 "%s: MTSETDRVBUFFER only allowed for root.\n", name); 3383 retval = (-EPERM); 3384 goto out; 3385 } 3386 if (!STm->defined && 3387 (mtc.mt_op != MTSETDRVBUFFER && 3388 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3389 retval = (-ENXIO); 3390 goto out; 3391 } 3392 3393 if (!STp->pos_unknown) { 3394 3395 if (STps->eof == ST_FM_HIT) { 3396 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3397 mtc.mt_op == MTEOM) { 3398 mtc.mt_count -= 1; 3399 if (STps->drv_file >= 0) 3400 STps->drv_file += 1; 3401 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3402 mtc.mt_count += 1; 3403 if (STps->drv_file >= 0) 3404 STps->drv_file += 1; 3405 } 3406 } 3407 3408 if (mtc.mt_op == MTSEEK) { 3409 /* Old position must be restored if partition will be 3410 changed */ 3411 i = !STp->can_partitions || 3412 (STp->new_partition != STp->partition); 3413 } else { 3414 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3415 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3416 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3417 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3418 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3419 mtc.mt_op == MTCOMPRESSION; 3420 } 3421 i = flush_buffer(STp, i); 3422 if (i < 0) { 3423 retval = i; 3424 goto out; 3425 } 3426 if (STps->rw == ST_WRITING && 3427 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3428 mtc.mt_op == MTSEEK || 3429 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3430 i = st_int_ioctl(STp, MTWEOF, 1); 3431 if (i < 0) { 3432 retval = i; 3433 goto out; 3434 } 3435 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3436 mtc.mt_count++; 3437 STps->rw = ST_IDLE; 3438 } 3439 3440 } else { 3441 /* 3442 * If there was a bus reset, block further access 3443 * to this device. If the user wants to rewind the tape, 3444 * then reset the flag and allow access again. 3445 */ 3446 if (mtc.mt_op != MTREW && 3447 mtc.mt_op != MTOFFL && 3448 mtc.mt_op != MTRETEN && 3449 mtc.mt_op != MTERASE && 3450 mtc.mt_op != MTSEEK && 3451 mtc.mt_op != MTEOM) { 3452 retval = (-EIO); 3453 goto out; 3454 } 3455 reset_state(STp); 3456 /* remove this when the midlevel properly clears was_reset */ 3457 STp->device->was_reset = 0; 3458 } 3459 3460 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3461 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3462 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3463 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3464 3465 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3466 do_door_lock(STp, 0); /* Ignore result! */ 3467 3468 if (mtc.mt_op == MTSETDRVBUFFER && 3469 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3470 retval = st_set_options(STp, mtc.mt_count); 3471 goto out; 3472 } 3473 3474 if (mtc.mt_op == MTSETPART) { 3475 if (!STp->can_partitions || 3476 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3477 retval = (-EINVAL); 3478 goto out; 3479 } 3480 if (mtc.mt_count >= STp->nbr_partitions && 3481 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3482 retval = (-EIO); 3483 goto out; 3484 } 3485 if (mtc.mt_count >= STp->nbr_partitions) { 3486 retval = (-EINVAL); 3487 goto out; 3488 } 3489 STp->new_partition = mtc.mt_count; 3490 retval = 0; 3491 goto out; 3492 } 3493 3494 if (mtc.mt_op == MTMKPART) { 3495 if (!STp->can_partitions) { 3496 retval = (-EINVAL); 3497 goto out; 3498 } 3499 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || 3500 (i = partition_tape(STp, mtc.mt_count)) < 0) { 3501 retval = i; 3502 goto out; 3503 } 3504 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3505 STp->ps[i].rw = ST_IDLE; 3506 STp->ps[i].at_sm = 0; 3507 STp->ps[i].last_block_valid = 0; 3508 } 3509 STp->partition = STp->new_partition = 0; 3510 STp->nbr_partitions = 1; /* Bad guess ?-) */ 3511 STps->drv_block = STps->drv_file = 0; 3512 retval = 0; 3513 goto out; 3514 } 3515 3516 if (mtc.mt_op == MTSEEK) { 3517 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3518 if (!STp->can_partitions) 3519 STp->ps[0].rw = ST_IDLE; 3520 retval = i; 3521 goto out; 3522 } 3523 3524 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3525 retval = do_load_unload(STp, file, 0); 3526 goto out; 3527 } 3528 3529 if (mtc.mt_op == MTLOAD) { 3530 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3531 goto out; 3532 } 3533 3534 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3535 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3536 goto out; 3537 } 3538 3539 if (STp->can_partitions && STp->ready == ST_READY && 3540 (i = switch_partition(STp)) < 0) { 3541 retval = i; 3542 goto out; 3543 } 3544 3545 if (mtc.mt_op == MTCOMPRESSION) 3546 retval = st_compression(STp, (mtc.mt_count & 1)); 3547 else 3548 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3549 goto out; 3550 } 3551 if (!STm->defined) { 3552 retval = (-ENXIO); 3553 goto out; 3554 } 3555 3556 if ((i = flush_buffer(STp, 0)) < 0) { 3557 retval = i; 3558 goto out; 3559 } 3560 if (STp->can_partitions && 3561 (i = switch_partition(STp)) < 0) { 3562 retval = i; 3563 goto out; 3564 } 3565 3566 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3567 struct mtget mt_status; 3568 3569 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3570 retval = (-EINVAL); 3571 goto out; 3572 } 3573 3574 mt_status.mt_type = STp->tape_type; 3575 mt_status.mt_dsreg = 3576 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3577 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3578 mt_status.mt_blkno = STps->drv_block; 3579 mt_status.mt_fileno = STps->drv_file; 3580 if (STp->block_size != 0) { 3581 if (STps->rw == ST_WRITING) 3582 mt_status.mt_blkno += 3583 (STp->buffer)->buffer_bytes / STp->block_size; 3584 else if (STps->rw == ST_READING) 3585 mt_status.mt_blkno -= 3586 ((STp->buffer)->buffer_bytes + 3587 STp->block_size - 1) / STp->block_size; 3588 } 3589 3590 mt_status.mt_gstat = 0; 3591 if (STp->drv_write_prot) 3592 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3593 if (mt_status.mt_blkno == 0) { 3594 if (mt_status.mt_fileno == 0) 3595 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3596 else 3597 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3598 } 3599 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3600 mt_status.mt_resid = STp->partition; 3601 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3602 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3603 else if (STps->eof >= ST_EOM_OK) 3604 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3605 if (STp->density == 1) 3606 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3607 else if (STp->density == 2) 3608 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3609 else if (STp->density == 3) 3610 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3611 if (STp->ready == ST_READY) 3612 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3613 if (STp->ready == ST_NO_TAPE) 3614 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3615 if (STps->at_sm) 3616 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3617 if (STm->do_async_writes || 3618 (STm->do_buffer_writes && STp->block_size != 0) || 3619 STp->drv_buffer != 0) 3620 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3621 if (STp->cleaning_req) 3622 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3623 3624 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3625 if (i) { 3626 retval = (-EFAULT); 3627 goto out; 3628 } 3629 3630 STp->recover_reg = 0; /* Clear after read */ 3631 retval = 0; 3632 goto out; 3633 } /* End of MTIOCGET */ 3634 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3635 struct mtpos mt_pos; 3636 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3637 retval = (-EINVAL); 3638 goto out; 3639 } 3640 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3641 retval = i; 3642 goto out; 3643 } 3644 mt_pos.mt_blkno = blk; 3645 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3646 if (i) 3647 retval = (-EFAULT); 3648 goto out; 3649 } 3650 mutex_unlock(&STp->lock); 3651 switch (cmd_in) { 3652 case SCSI_IOCTL_GET_IDLUN: 3653 case SCSI_IOCTL_GET_BUS_NUMBER: 3654 break; 3655 default: 3656 if ((cmd_in == SG_IO || 3657 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3658 cmd_in == CDROM_SEND_PACKET) && 3659 !capable(CAP_SYS_RAWIO)) 3660 i = -EPERM; 3661 else 3662 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3663 file->f_mode, cmd_in, p); 3664 if (i != -ENOTTY) 3665 return i; 3666 break; 3667 } 3668 retval = scsi_ioctl(STp->device, cmd_in, p); 3669 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3670 STp->rew_at_close = 0; 3671 STp->ready = ST_NO_TAPE; 3672 } 3673 return retval; 3674 3675 out: 3676 mutex_unlock(&STp->lock); 3677 return retval; 3678 } 3679 3680 #ifdef CONFIG_COMPAT 3681 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3682 { 3683 struct scsi_tape *STp = file->private_data; 3684 struct scsi_device *sdev = STp->device; 3685 int ret = -ENOIOCTLCMD; 3686 if (sdev->host->hostt->compat_ioctl) { 3687 3688 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3689 3690 } 3691 return ret; 3692 } 3693 #endif 3694 3695 3696 3697 /* Try to allocate a new tape buffer. Calling function must not hold 3698 dev_arr_lock. */ 3699 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3700 { 3701 struct st_buffer *tb; 3702 3703 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); 3704 if (!tb) { 3705 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3706 return NULL; 3707 } 3708 tb->frp_segs = 0; 3709 tb->use_sg = max_sg; 3710 tb->dma = need_dma; 3711 tb->buffer_size = 0; 3712 3713 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), 3714 GFP_ATOMIC); 3715 if (!tb->reserved_pages) { 3716 kfree(tb); 3717 return NULL; 3718 } 3719 3720 return tb; 3721 } 3722 3723 3724 /* Try to allocate enough space in the tape buffer */ 3725 #define ST_MAX_ORDER 6 3726 3727 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3728 { 3729 int segs, max_segs, b_size, order, got; 3730 gfp_t priority; 3731 3732 if (new_size <= STbuffer->buffer_size) 3733 return 1; 3734 3735 if (STbuffer->buffer_size <= PAGE_SIZE) 3736 normalize_buffer(STbuffer); /* Avoid extra segment */ 3737 3738 max_segs = STbuffer->use_sg; 3739 3740 priority = GFP_KERNEL | __GFP_NOWARN; 3741 if (need_dma) 3742 priority |= GFP_DMA; 3743 3744 if (STbuffer->cleared) 3745 priority |= __GFP_ZERO; 3746 3747 if (STbuffer->frp_segs) { 3748 order = STbuffer->reserved_page_order; 3749 b_size = PAGE_SIZE << order; 3750 } else { 3751 for (b_size = PAGE_SIZE, order = 0; 3752 order < ST_MAX_ORDER && 3753 max_segs * (PAGE_SIZE << order) < new_size; 3754 order++, b_size *= 2) 3755 ; /* empty */ 3756 STbuffer->reserved_page_order = order; 3757 } 3758 if (max_segs * (PAGE_SIZE << order) < new_size) { 3759 if (order == ST_MAX_ORDER) 3760 return 0; 3761 normalize_buffer(STbuffer); 3762 return enlarge_buffer(STbuffer, new_size, need_dma); 3763 } 3764 3765 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3766 segs < max_segs && got < new_size;) { 3767 struct page *page; 3768 3769 page = alloc_pages(priority, order); 3770 if (!page) { 3771 DEB(STbuffer->buffer_size = got); 3772 normalize_buffer(STbuffer); 3773 return 0; 3774 } 3775 3776 STbuffer->frp_segs += 1; 3777 got += b_size; 3778 STbuffer->buffer_size = got; 3779 STbuffer->reserved_pages[segs] = page; 3780 segs++; 3781 } 3782 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3783 3784 return 1; 3785 } 3786 3787 3788 /* Make sure that no data from previous user is in the internal buffer */ 3789 static void clear_buffer(struct st_buffer * st_bp) 3790 { 3791 int i; 3792 3793 for (i=0; i < st_bp->frp_segs; i++) 3794 memset(page_address(st_bp->reserved_pages[i]), 0, 3795 PAGE_SIZE << st_bp->reserved_page_order); 3796 st_bp->cleared = 1; 3797 } 3798 3799 3800 /* Release the extra buffer */ 3801 static void normalize_buffer(struct st_buffer * STbuffer) 3802 { 3803 int i, order = STbuffer->reserved_page_order; 3804 3805 for (i = 0; i < STbuffer->frp_segs; i++) { 3806 __free_pages(STbuffer->reserved_pages[i], order); 3807 STbuffer->buffer_size -= (PAGE_SIZE << order); 3808 } 3809 STbuffer->frp_segs = 0; 3810 STbuffer->sg_segs = 0; 3811 STbuffer->reserved_page_order = 0; 3812 STbuffer->map_data.offset = 0; 3813 } 3814 3815 3816 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3817 negative error code. */ 3818 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3819 { 3820 int i, cnt, res, offset; 3821 int length = PAGE_SIZE << st_bp->reserved_page_order; 3822 3823 for (i = 0, offset = st_bp->buffer_bytes; 3824 i < st_bp->frp_segs && offset >= length; i++) 3825 offset -= length; 3826 if (i == st_bp->frp_segs) { /* Should never happen */ 3827 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 3828 return (-EIO); 3829 } 3830 for (; i < st_bp->frp_segs && do_count > 0; i++) { 3831 struct page *page = st_bp->reserved_pages[i]; 3832 cnt = length - offset < do_count ? length - offset : do_count; 3833 res = copy_from_user(page_address(page) + offset, ubp, cnt); 3834 if (res) 3835 return (-EFAULT); 3836 do_count -= cnt; 3837 st_bp->buffer_bytes += cnt; 3838 ubp += cnt; 3839 offset = 0; 3840 } 3841 if (do_count) /* Should never happen */ 3842 return (-EIO); 3843 3844 return 0; 3845 } 3846 3847 3848 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 3849 negative error code. */ 3850 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 3851 { 3852 int i, cnt, res, offset; 3853 int length = PAGE_SIZE << st_bp->reserved_page_order; 3854 3855 for (i = 0, offset = st_bp->read_pointer; 3856 i < st_bp->frp_segs && offset >= length; i++) 3857 offset -= length; 3858 if (i == st_bp->frp_segs) { /* Should never happen */ 3859 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 3860 return (-EIO); 3861 } 3862 for (; i < st_bp->frp_segs && do_count > 0; i++) { 3863 struct page *page = st_bp->reserved_pages[i]; 3864 cnt = length - offset < do_count ? length - offset : do_count; 3865 res = copy_to_user(ubp, page_address(page) + offset, cnt); 3866 if (res) 3867 return (-EFAULT); 3868 do_count -= cnt; 3869 st_bp->buffer_bytes -= cnt; 3870 st_bp->read_pointer += cnt; 3871 ubp += cnt; 3872 offset = 0; 3873 } 3874 if (do_count) /* Should never happen */ 3875 return (-EIO); 3876 3877 return 0; 3878 } 3879 3880 3881 /* Move data towards start of buffer */ 3882 static void move_buffer_data(struct st_buffer * st_bp, int offset) 3883 { 3884 int src_seg, dst_seg, src_offset = 0, dst_offset; 3885 int count, total; 3886 int length = PAGE_SIZE << st_bp->reserved_page_order; 3887 3888 if (offset == 0) 3889 return; 3890 3891 total=st_bp->buffer_bytes - offset; 3892 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 3893 src_offset = offset; 3894 if (src_offset < length) 3895 break; 3896 offset -= length; 3897 } 3898 3899 st_bp->buffer_bytes = st_bp->read_pointer = total; 3900 for (dst_seg=dst_offset=0; total > 0; ) { 3901 struct page *dpage = st_bp->reserved_pages[dst_seg]; 3902 struct page *spage = st_bp->reserved_pages[src_seg]; 3903 3904 count = min(length - dst_offset, length - src_offset); 3905 memmove(page_address(dpage) + dst_offset, 3906 page_address(spage) + src_offset, count); 3907 src_offset += count; 3908 if (src_offset >= length) { 3909 src_seg++; 3910 src_offset = 0; 3911 } 3912 dst_offset += count; 3913 if (dst_offset >= length) { 3914 dst_seg++; 3915 dst_offset = 0; 3916 } 3917 total -= count; 3918 } 3919 } 3920 3921 /* Validate the options from command line or module parameters */ 3922 static void validate_options(void) 3923 { 3924 if (buffer_kbs > 0) 3925 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 3926 if (max_sg_segs >= ST_FIRST_SG) 3927 st_max_sg_segs = max_sg_segs; 3928 } 3929 3930 #ifndef MODULE 3931 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 3932 */ 3933 static int __init st_setup(char *str) 3934 { 3935 int i, len, ints[5]; 3936 char *stp; 3937 3938 stp = get_options(str, ARRAY_SIZE(ints), ints); 3939 3940 if (ints[0] > 0) { 3941 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 3942 if (parms[i].val) 3943 *parms[i].val = ints[i + 1]; 3944 } else { 3945 while (stp != NULL) { 3946 for (i = 0; i < ARRAY_SIZE(parms); i++) { 3947 len = strlen(parms[i].name); 3948 if (!strncmp(stp, parms[i].name, len) && 3949 (*(stp + len) == ':' || *(stp + len) == '=')) { 3950 if (parms[i].val) 3951 *parms[i].val = 3952 simple_strtoul(stp + len + 1, NULL, 0); 3953 else 3954 printk(KERN_WARNING "st: Obsolete parameter %s\n", 3955 parms[i].name); 3956 break; 3957 } 3958 } 3959 if (i >= ARRAY_SIZE(parms)) 3960 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 3961 stp); 3962 stp = strchr(stp, ','); 3963 if (stp) 3964 stp++; 3965 } 3966 } 3967 3968 validate_options(); 3969 3970 return 1; 3971 } 3972 3973 __setup("st=", st_setup); 3974 3975 #endif 3976 3977 static const struct file_operations st_fops = 3978 { 3979 .owner = THIS_MODULE, 3980 .read = st_read, 3981 .write = st_write, 3982 .unlocked_ioctl = st_ioctl, 3983 #ifdef CONFIG_COMPAT 3984 .compat_ioctl = st_compat_ioctl, 3985 #endif 3986 .open = st_open, 3987 .flush = st_flush, 3988 .release = st_release, 3989 .llseek = noop_llseek, 3990 }; 3991 3992 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 3993 { 3994 int i, error; 3995 dev_t cdev_devno; 3996 struct cdev *cdev; 3997 struct device *dev; 3998 struct st_modedef *STm = &(tape->modes[mode]); 3999 char name[10]; 4000 int dev_num = tape->index; 4001 4002 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4003 4004 cdev = cdev_alloc(); 4005 if (!cdev) { 4006 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4007 error = -ENOMEM; 4008 goto out; 4009 } 4010 cdev->owner = THIS_MODULE; 4011 cdev->ops = &st_fops; 4012 4013 error = cdev_add(cdev, cdev_devno, 1); 4014 if (error) { 4015 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4016 rew ? "non" : "auto", mode); 4017 pr_err("st%d: Device not attached.\n", dev_num); 4018 goto out_free; 4019 } 4020 STm->cdevs[rew] = cdev; 4021 4022 i = mode << (4 - ST_NBR_MODE_BITS); 4023 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4024 tape->disk->disk_name, st_formats[i]); 4025 4026 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4027 cdev_devno, &tape->modes[mode], "%s", name); 4028 if (IS_ERR(dev)) { 4029 pr_err("st%d: device_create failed\n", dev_num); 4030 error = PTR_ERR(dev); 4031 goto out_free; 4032 } 4033 4034 STm->devs[rew] = dev; 4035 4036 return 0; 4037 out_free: 4038 cdev_del(STm->cdevs[rew]); 4039 STm->cdevs[rew] = NULL; 4040 out: 4041 return error; 4042 } 4043 4044 static int create_cdevs(struct scsi_tape *tape) 4045 { 4046 int mode, error; 4047 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4048 error = create_one_cdev(tape, mode, 0); 4049 if (error) 4050 return error; 4051 error = create_one_cdev(tape, mode, 1); 4052 if (error) 4053 return error; 4054 } 4055 4056 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4057 &tape->modes[0].devs[0]->kobj, "tape"); 4058 } 4059 4060 static void remove_cdevs(struct scsi_tape *tape) 4061 { 4062 int mode, rew; 4063 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4064 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4065 struct st_modedef *STm = &(tape->modes[mode]); 4066 for (rew = 0; rew < 2; rew++) { 4067 if (STm->cdevs[rew]) 4068 cdev_del(STm->cdevs[rew]); 4069 if (STm->devs[rew]) 4070 device_unregister(STm->devs[rew]); 4071 } 4072 } 4073 } 4074 4075 static int st_probe(struct device *dev) 4076 { 4077 struct scsi_device *SDp = to_scsi_device(dev); 4078 struct gendisk *disk = NULL; 4079 struct scsi_tape *tpnt = NULL; 4080 struct st_modedef *STm; 4081 struct st_partstat *STps; 4082 struct st_buffer *buffer; 4083 int i, error; 4084 char *stp; 4085 4086 if (SDp->type != TYPE_TAPE) 4087 return -ENODEV; 4088 if ((stp = st_incompatible(SDp))) { 4089 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4090 printk(KERN_INFO "st: The suggested driver is %s.\n", stp); 4091 return -ENODEV; 4092 } 4093 4094 i = queue_max_segments(SDp->request_queue); 4095 if (st_max_sg_segs < i) 4096 i = st_max_sg_segs; 4097 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4098 if (buffer == NULL) { 4099 printk(KERN_ERR 4100 "st: Can't allocate new tape buffer. Device not attached.\n"); 4101 goto out; 4102 } 4103 4104 disk = alloc_disk(1); 4105 if (!disk) { 4106 printk(KERN_ERR "st: out of memory. Device not attached.\n"); 4107 goto out_buffer_free; 4108 } 4109 4110 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); 4111 if (tpnt == NULL) { 4112 printk(KERN_ERR "st: Can't allocate device descriptor.\n"); 4113 goto out_put_disk; 4114 } 4115 kref_init(&tpnt->kref); 4116 tpnt->disk = disk; 4117 disk->private_data = &tpnt->driver; 4118 disk->queue = SDp->request_queue; 4119 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4120 * take queue reference that release_disk() expects. */ 4121 if (!blk_get_queue(disk->queue)) 4122 goto out_put_disk; 4123 tpnt->driver = &st_template; 4124 4125 tpnt->device = SDp; 4126 if (SDp->scsi_level <= 2) 4127 tpnt->tape_type = MT_ISSCSI1; 4128 else 4129 tpnt->tape_type = MT_ISSCSI2; 4130 4131 tpnt->buffer = buffer; 4132 tpnt->buffer->last_SRpnt = NULL; 4133 4134 tpnt->inited = 0; 4135 tpnt->dirty = 0; 4136 tpnt->in_use = 0; 4137 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4138 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4139 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4140 tpnt->density = 0; 4141 tpnt->do_auto_lock = ST_AUTO_LOCK; 4142 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4143 tpnt->can_partitions = 0; 4144 tpnt->two_fm = ST_TWO_FM; 4145 tpnt->fast_mteom = ST_FAST_MTEOM; 4146 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4147 tpnt->sili = ST_SILI; 4148 tpnt->immediate = ST_NOWAIT; 4149 tpnt->immediate_filemark = 0; 4150 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4151 tpnt->partition = 0; 4152 tpnt->new_partition = 0; 4153 tpnt->nbr_partitions = 0; 4154 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4155 tpnt->long_timeout = ST_LONG_TIMEOUT; 4156 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4157 4158 for (i = 0; i < ST_NBR_MODES; i++) { 4159 STm = &(tpnt->modes[i]); 4160 STm->defined = 0; 4161 STm->sysv = ST_SYSV; 4162 STm->defaults_for_writes = 0; 4163 STm->do_async_writes = ST_ASYNC_WRITES; 4164 STm->do_buffer_writes = ST_BUFFER_WRITES; 4165 STm->do_read_ahead = ST_READ_AHEAD; 4166 STm->default_compression = ST_DONT_TOUCH; 4167 STm->default_blksize = (-1); /* No forced size */ 4168 STm->default_density = (-1); /* No forced density */ 4169 STm->tape = tpnt; 4170 } 4171 4172 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4173 STps = &(tpnt->ps[i]); 4174 STps->rw = ST_IDLE; 4175 STps->eof = ST_NOEOF; 4176 STps->at_sm = 0; 4177 STps->last_block_valid = 0; 4178 STps->drv_block = (-1); 4179 STps->drv_file = (-1); 4180 } 4181 4182 tpnt->current_mode = 0; 4183 tpnt->modes[0].defined = 1; 4184 4185 tpnt->density_changed = tpnt->compression_changed = 4186 tpnt->blksize_changed = 0; 4187 mutex_init(&tpnt->lock); 4188 4189 idr_preload(GFP_KERNEL); 4190 spin_lock(&st_index_lock); 4191 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4192 spin_unlock(&st_index_lock); 4193 idr_preload_end(); 4194 if (error < 0) { 4195 pr_warn("st: idr allocation failed: %d\n", error); 4196 goto out_put_queue; 4197 } 4198 tpnt->index = error; 4199 sprintf(disk->disk_name, "st%d", tpnt->index); 4200 4201 dev_set_drvdata(dev, tpnt); 4202 4203 4204 error = create_cdevs(tpnt); 4205 if (error) 4206 goto out_remove_devs; 4207 scsi_autopm_put_device(SDp); 4208 4209 sdev_printk(KERN_NOTICE, SDp, 4210 "Attached scsi tape %s\n", tape_name(tpnt)); 4211 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4212 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4213 queue_dma_alignment(SDp->request_queue) + 1); 4214 4215 return 0; 4216 4217 out_remove_devs: 4218 remove_cdevs(tpnt); 4219 spin_lock(&st_index_lock); 4220 idr_remove(&st_index_idr, tpnt->index); 4221 spin_unlock(&st_index_lock); 4222 out_put_queue: 4223 blk_put_queue(disk->queue); 4224 out_put_disk: 4225 put_disk(disk); 4226 kfree(tpnt); 4227 out_buffer_free: 4228 kfree(buffer); 4229 out: 4230 return -ENODEV; 4231 }; 4232 4233 4234 static int st_remove(struct device *dev) 4235 { 4236 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4237 int index = tpnt->index; 4238 4239 scsi_autopm_get_device(to_scsi_device(dev)); 4240 remove_cdevs(tpnt); 4241 4242 mutex_lock(&st_ref_mutex); 4243 kref_put(&tpnt->kref, scsi_tape_release); 4244 mutex_unlock(&st_ref_mutex); 4245 spin_lock(&st_index_lock); 4246 idr_remove(&st_index_idr, index); 4247 spin_unlock(&st_index_lock); 4248 return 0; 4249 } 4250 4251 /** 4252 * scsi_tape_release - Called to free the Scsi_Tape structure 4253 * @kref: pointer to embedded kref 4254 * 4255 * st_ref_mutex must be held entering this routine. Because it is 4256 * called on last put, you should always use the scsi_tape_get() 4257 * scsi_tape_put() helpers which manipulate the semaphore directly 4258 * and never do a direct kref_put(). 4259 **/ 4260 static void scsi_tape_release(struct kref *kref) 4261 { 4262 struct scsi_tape *tpnt = to_scsi_tape(kref); 4263 struct gendisk *disk = tpnt->disk; 4264 4265 tpnt->device = NULL; 4266 4267 if (tpnt->buffer) { 4268 normalize_buffer(tpnt->buffer); 4269 kfree(tpnt->buffer->reserved_pages); 4270 kfree(tpnt->buffer); 4271 } 4272 4273 disk->private_data = NULL; 4274 put_disk(disk); 4275 kfree(tpnt); 4276 return; 4277 } 4278 4279 static struct class st_sysfs_class = { 4280 .name = "scsi_tape", 4281 .dev_groups = st_dev_groups, 4282 }; 4283 4284 static int __init init_st(void) 4285 { 4286 int err; 4287 4288 validate_options(); 4289 4290 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4291 verstr, st_fixed_buffer_size, st_max_sg_segs); 4292 4293 err = class_register(&st_sysfs_class); 4294 if (err) { 4295 pr_err("Unable register sysfs class for SCSI tapes\n"); 4296 return err; 4297 } 4298 4299 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4300 ST_MAX_TAPE_ENTRIES, "st"); 4301 if (err) { 4302 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4303 SCSI_TAPE_MAJOR); 4304 goto err_class; 4305 } 4306 4307 err = scsi_register_driver(&st_template.gendrv); 4308 if (err) 4309 goto err_chrdev; 4310 4311 err = do_create_sysfs_files(); 4312 if (err) 4313 goto err_scsidrv; 4314 4315 return 0; 4316 4317 err_scsidrv: 4318 scsi_unregister_driver(&st_template.gendrv); 4319 err_chrdev: 4320 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4321 ST_MAX_TAPE_ENTRIES); 4322 err_class: 4323 class_unregister(&st_sysfs_class); 4324 return err; 4325 } 4326 4327 static void __exit exit_st(void) 4328 { 4329 do_remove_sysfs_files(); 4330 scsi_unregister_driver(&st_template.gendrv); 4331 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4332 ST_MAX_TAPE_ENTRIES); 4333 class_unregister(&st_sysfs_class); 4334 printk(KERN_INFO "st: Unloaded.\n"); 4335 } 4336 4337 module_init(init_st); 4338 module_exit(exit_st); 4339 4340 4341 /* The sysfs driver interface. Read-only at the moment */ 4342 static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) 4343 { 4344 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4345 } 4346 static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); 4347 4348 static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4349 { 4350 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4351 } 4352 static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); 4353 4354 static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) 4355 { 4356 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4357 } 4358 static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); 4359 4360 static ssize_t st_version_show(struct device_driver *ddd, char *buf) 4361 { 4362 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4363 } 4364 static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); 4365 4366 static int do_create_sysfs_files(void) 4367 { 4368 struct device_driver *sysfs = &st_template.gendrv; 4369 int err; 4370 4371 err = driver_create_file(sysfs, &driver_attr_try_direct_io); 4372 if (err) 4373 return err; 4374 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); 4375 if (err) 4376 goto err_try_direct_io; 4377 err = driver_create_file(sysfs, &driver_attr_max_sg_segs); 4378 if (err) 4379 goto err_attr_fixed_buf; 4380 err = driver_create_file(sysfs, &driver_attr_version); 4381 if (err) 4382 goto err_attr_max_sg; 4383 4384 return 0; 4385 4386 err_attr_max_sg: 4387 driver_remove_file(sysfs, &driver_attr_max_sg_segs); 4388 err_attr_fixed_buf: 4389 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); 4390 err_try_direct_io: 4391 driver_remove_file(sysfs, &driver_attr_try_direct_io); 4392 return err; 4393 } 4394 4395 static void do_remove_sysfs_files(void) 4396 { 4397 struct device_driver *sysfs = &st_template.gendrv; 4398 4399 driver_remove_file(sysfs, &driver_attr_version); 4400 driver_remove_file(sysfs, &driver_attr_max_sg_segs); 4401 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); 4402 driver_remove_file(sysfs, &driver_attr_try_direct_io); 4403 } 4404 4405 /* The sysfs simple class interface */ 4406 static ssize_t 4407 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4408 { 4409 struct st_modedef *STm = dev_get_drvdata(dev); 4410 ssize_t l = 0; 4411 4412 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4413 return l; 4414 } 4415 static DEVICE_ATTR_RO(defined); 4416 4417 static ssize_t 4418 default_blksize_show(struct device *dev, struct device_attribute *attr, 4419 char *buf) 4420 { 4421 struct st_modedef *STm = dev_get_drvdata(dev); 4422 ssize_t l = 0; 4423 4424 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4425 return l; 4426 } 4427 static DEVICE_ATTR_RO(default_blksize); 4428 4429 static ssize_t 4430 default_density_show(struct device *dev, struct device_attribute *attr, 4431 char *buf) 4432 { 4433 struct st_modedef *STm = dev_get_drvdata(dev); 4434 ssize_t l = 0; 4435 char *fmt; 4436 4437 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4438 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4439 return l; 4440 } 4441 static DEVICE_ATTR_RO(default_density); 4442 4443 static ssize_t 4444 default_compression_show(struct device *dev, struct device_attribute *attr, 4445 char *buf) 4446 { 4447 struct st_modedef *STm = dev_get_drvdata(dev); 4448 ssize_t l = 0; 4449 4450 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4451 return l; 4452 } 4453 static DEVICE_ATTR_RO(default_compression); 4454 4455 static ssize_t 4456 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4457 { 4458 struct st_modedef *STm = dev_get_drvdata(dev); 4459 struct scsi_tape *STp = STm->tape; 4460 int options; 4461 ssize_t l = 0; 4462 4463 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4464 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4465 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4466 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4467 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4468 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4469 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4470 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4471 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4472 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4473 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4474 options |= STm->sysv ? MT_ST_SYSV : 0; 4475 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4476 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4477 options |= STp->sili ? MT_ST_SILI : 0; 4478 4479 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4480 return l; 4481 } 4482 static DEVICE_ATTR_RO(options); 4483 4484 static struct attribute *st_dev_attrs[] = { 4485 &dev_attr_defined.attr, 4486 &dev_attr_default_blksize.attr, 4487 &dev_attr_default_density.attr, 4488 &dev_attr_default_compression.attr, 4489 &dev_attr_options.attr, 4490 NULL, 4491 }; 4492 ATTRIBUTE_GROUPS(st_dev); 4493 4494 /* The following functions may be useful for a larger audience. */ 4495 static int sgl_map_user_pages(struct st_buffer *STbp, 4496 const unsigned int max_pages, unsigned long uaddr, 4497 size_t count, int rw) 4498 { 4499 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4500 unsigned long start = uaddr >> PAGE_SHIFT; 4501 const int nr_pages = end - start; 4502 int res, i, j; 4503 struct page **pages; 4504 struct rq_map_data *mdata = &STbp->map_data; 4505 4506 /* User attempted Overflow! */ 4507 if ((uaddr + count) < uaddr) 4508 return -EINVAL; 4509 4510 /* Too big */ 4511 if (nr_pages > max_pages) 4512 return -ENOMEM; 4513 4514 /* Hmm? */ 4515 if (count == 0) 4516 return 0; 4517 4518 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) 4519 return -ENOMEM; 4520 4521 /* Try to fault in all of the necessary pages */ 4522 down_read(¤t->mm->mmap_sem); 4523 /* rw==READ means read from drive, write into memory area */ 4524 res = get_user_pages( 4525 current, 4526 current->mm, 4527 uaddr, 4528 nr_pages, 4529 rw == READ, 4530 0, /* don't force */ 4531 pages, 4532 NULL); 4533 up_read(¤t->mm->mmap_sem); 4534 4535 /* Errors and no page mapped should return here */ 4536 if (res < nr_pages) 4537 goto out_unmap; 4538 4539 for (i=0; i < nr_pages; i++) { 4540 /* FIXME: flush superflous for rw==READ, 4541 * probably wrong function for rw==WRITE 4542 */ 4543 flush_dcache_page(pages[i]); 4544 } 4545 4546 mdata->offset = uaddr & ~PAGE_MASK; 4547 STbp->mapped_pages = pages; 4548 4549 return nr_pages; 4550 out_unmap: 4551 if (res > 0) { 4552 for (j=0; j < res; j++) 4553 page_cache_release(pages[j]); 4554 res = 0; 4555 } 4556 kfree(pages); 4557 return res; 4558 } 4559 4560 4561 /* And unmap them... */ 4562 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4563 const unsigned int nr_pages, int dirtied) 4564 { 4565 int i; 4566 4567 for (i=0; i < nr_pages; i++) { 4568 struct page *page = STbp->mapped_pages[i]; 4569 4570 if (dirtied) 4571 SetPageDirty(page); 4572 /* FIXME: cache flush missing for rw==READ 4573 * FIXME: call the correct reference counting function 4574 */ 4575 page_cache_release(page); 4576 } 4577 kfree(STbp->mapped_pages); 4578 STbp->mapped_pages = NULL; 4579 4580 return 0; 4581 } 4582