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 struct device_attribute st_dev_attrs[]; 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 = filp->f_path.dentry->d_inode; 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 2202 STm = &(STp->modes[STp->current_mode]); 2203 if (!STm->defined) { 2204 cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; 2205 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2206 STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; 2207 modes_defined = 1; 2208 DEBC(printk(ST_DEB_MSG 2209 "%s: Initialized mode %d definition from mode 0\n", 2210 name, STp->current_mode)); 2211 } 2212 2213 code = options & MT_ST_OPTIONS; 2214 if (code == MT_ST_BOOLEANS) { 2215 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2216 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2217 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2218 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2219 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2220 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2221 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2222 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2223 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2224 if ((STp->device)->scsi_level >= SCSI_2) 2225 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2226 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2227 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2228 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2229 STm->sysv = (options & MT_ST_SYSV) != 0; 2230 STp->sili = (options & MT_ST_SILI) != 0; 2231 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2232 st_log_options(STp, STm, name); ) 2233 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2234 value = (code == MT_ST_SETBOOLEANS); 2235 if ((options & MT_ST_BUFFER_WRITES) != 0) 2236 STm->do_buffer_writes = value; 2237 if ((options & MT_ST_ASYNC_WRITES) != 0) 2238 STm->do_async_writes = value; 2239 if ((options & MT_ST_DEF_WRITES) != 0) 2240 STm->defaults_for_writes = value; 2241 if ((options & MT_ST_READ_AHEAD) != 0) 2242 STm->do_read_ahead = value; 2243 if ((options & MT_ST_TWO_FM) != 0) 2244 STp->two_fm = value; 2245 if ((options & MT_ST_FAST_MTEOM) != 0) 2246 STp->fast_mteom = value; 2247 if ((options & MT_ST_AUTO_LOCK) != 0) 2248 STp->do_auto_lock = value; 2249 if ((options & MT_ST_CAN_BSR) != 0) 2250 STp->can_bsr = value; 2251 if ((options & MT_ST_NO_BLKLIMS) != 0) 2252 STp->omit_blklims = value; 2253 if ((STp->device)->scsi_level >= SCSI_2 && 2254 (options & MT_ST_CAN_PARTITIONS) != 0) 2255 STp->can_partitions = value; 2256 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2257 STp->scsi2_logical = value; 2258 if ((options & MT_ST_NOWAIT) != 0) 2259 STp->immediate = value; 2260 if ((options & MT_ST_NOWAIT_EOF) != 0) 2261 STp->immediate_filemark = value; 2262 if ((options & MT_ST_SYSV) != 0) 2263 STm->sysv = value; 2264 if ((options & MT_ST_SILI) != 0) 2265 STp->sili = value; 2266 DEB( 2267 if ((options & MT_ST_DEBUGGING) != 0) 2268 debugging = value; 2269 st_log_options(STp, STm, name); ) 2270 } else if (code == MT_ST_WRITE_THRESHOLD) { 2271 /* Retained for compatibility */ 2272 } else if (code == MT_ST_DEF_BLKSIZE) { 2273 value = (options & ~MT_ST_OPTIONS); 2274 if (value == ~MT_ST_OPTIONS) { 2275 STm->default_blksize = (-1); 2276 DEBC( printk(KERN_INFO "%s: Default block size disabled.\n", name)); 2277 } else { 2278 STm->default_blksize = value; 2279 DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", 2280 name, STm->default_blksize)); 2281 if (STp->ready == ST_READY) { 2282 STp->blksize_changed = 0; 2283 set_mode_densblk(STp, STm); 2284 } 2285 } 2286 } else if (code == MT_ST_TIMEOUTS) { 2287 value = (options & ~MT_ST_OPTIONS); 2288 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2289 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2290 DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, 2291 (value & ~MT_ST_SET_LONG_TIMEOUT))); 2292 } else { 2293 blk_queue_rq_timeout(STp->device->request_queue, 2294 value * HZ); 2295 DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", 2296 name, value) ); 2297 } 2298 } else if (code == MT_ST_SET_CLN) { 2299 value = (options & ~MT_ST_OPTIONS) & 0xff; 2300 if (value != 0 && 2301 (value < EXTENDED_SENSE_START || 2302 value >= SCSI_SENSE_BUFFERSIZE)) 2303 return (-EINVAL); 2304 STp->cln_mode = value; 2305 STp->cln_sense_mask = (options >> 8) & 0xff; 2306 STp->cln_sense_value = (options >> 16) & 0xff; 2307 printk(KERN_INFO 2308 "%s: Cleaning request mode %d, mask %02x, value %02x\n", 2309 name, value, STp->cln_sense_mask, STp->cln_sense_value); 2310 } else if (code == MT_ST_DEF_OPTIONS) { 2311 code = (options & ~MT_ST_CLEAR_DEFAULT); 2312 value = (options & MT_ST_CLEAR_DEFAULT); 2313 if (code == MT_ST_DEF_DENSITY) { 2314 if (value == MT_ST_CLEAR_DEFAULT) { 2315 STm->default_density = (-1); 2316 DEBC( printk(KERN_INFO "%s: Density default disabled.\n", 2317 name)); 2318 } else { 2319 STm->default_density = value & 0xff; 2320 DEBC( printk(KERN_INFO "%s: Density default set to %x\n", 2321 name, STm->default_density)); 2322 if (STp->ready == ST_READY) { 2323 STp->density_changed = 0; 2324 set_mode_densblk(STp, STm); 2325 } 2326 } 2327 } else if (code == MT_ST_DEF_DRVBUFFER) { 2328 if (value == MT_ST_CLEAR_DEFAULT) { 2329 STp->default_drvbuffer = 0xff; 2330 DEBC( printk(KERN_INFO 2331 "%s: Drive buffer default disabled.\n", name)); 2332 } else { 2333 STp->default_drvbuffer = value & 7; 2334 DEBC( printk(KERN_INFO 2335 "%s: Drive buffer default set to %x\n", 2336 name, STp->default_drvbuffer)); 2337 if (STp->ready == ST_READY) 2338 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2339 } 2340 } else if (code == MT_ST_DEF_COMPRESSION) { 2341 if (value == MT_ST_CLEAR_DEFAULT) { 2342 STm->default_compression = ST_DONT_TOUCH; 2343 DEBC( printk(KERN_INFO 2344 "%s: Compression default disabled.\n", name)); 2345 } else { 2346 if ((value & 0xff00) != 0) { 2347 STp->c_algo = (value & 0xff00) >> 8; 2348 DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", 2349 name, STp->c_algo)); 2350 } 2351 if ((value & 0xff) != 0xff) { 2352 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2353 DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", 2354 name, (value & 1))); 2355 if (STp->ready == ST_READY) { 2356 STp->compression_changed = 0; 2357 st_compression(STp, (STm->default_compression == ST_YES)); 2358 } 2359 } 2360 } 2361 } 2362 } else 2363 return (-EIO); 2364 2365 return 0; 2366 } 2367 2368 #define MODE_HEADER_LENGTH 4 2369 2370 /* Mode header and page byte offsets */ 2371 #define MH_OFF_DATA_LENGTH 0 2372 #define MH_OFF_MEDIUM_TYPE 1 2373 #define MH_OFF_DEV_SPECIFIC 2 2374 #define MH_OFF_BDESCS_LENGTH 3 2375 #define MP_OFF_PAGE_NBR 0 2376 #define MP_OFF_PAGE_LENGTH 1 2377 2378 /* Mode header and page bit masks */ 2379 #define MH_BIT_WP 0x80 2380 #define MP_MSK_PAGE_NBR 0x3f 2381 2382 /* Don't return block descriptors */ 2383 #define MODE_SENSE_OMIT_BDESCS 0x08 2384 2385 #define MODE_SELECT_PAGE_FORMAT 0x10 2386 2387 /* Read a mode page into the tape buffer. The block descriptors are included 2388 if incl_block_descs is true. The page control is ored to the page number 2389 parameter, if necessary. */ 2390 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2391 { 2392 unsigned char cmd[MAX_COMMAND_SIZE]; 2393 struct st_request *SRpnt; 2394 2395 memset(cmd, 0, MAX_COMMAND_SIZE); 2396 cmd[0] = MODE_SENSE; 2397 if (omit_block_descs) 2398 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2399 cmd[2] = page; 2400 cmd[4] = 255; 2401 2402 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2403 STp->device->request_queue->rq_timeout, 0, 1); 2404 if (SRpnt == NULL) 2405 return (STp->buffer)->syscall_result; 2406 2407 st_release_request(SRpnt); 2408 2409 return STp->buffer->syscall_result; 2410 } 2411 2412 2413 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2414 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2415 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2416 { 2417 int pgo; 2418 unsigned char cmd[MAX_COMMAND_SIZE]; 2419 struct st_request *SRpnt; 2420 int timeout; 2421 2422 memset(cmd, 0, MAX_COMMAND_SIZE); 2423 cmd[0] = MODE_SELECT; 2424 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2425 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2426 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2427 2428 /* Clear reserved fields */ 2429 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2430 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2431 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2432 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2433 2434 timeout = slow ? 2435 STp->long_timeout : STp->device->request_queue->rq_timeout; 2436 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2437 timeout, 0, 1); 2438 if (SRpnt == NULL) 2439 return (STp->buffer)->syscall_result; 2440 2441 st_release_request(SRpnt); 2442 2443 return STp->buffer->syscall_result; 2444 } 2445 2446 2447 #define COMPRESSION_PAGE 0x0f 2448 #define COMPRESSION_PAGE_LENGTH 16 2449 2450 #define CP_OFF_DCE_DCC 2 2451 #define CP_OFF_C_ALGO 7 2452 2453 #define DCE_MASK 0x80 2454 #define DCC_MASK 0x40 2455 #define RED_MASK 0x60 2456 2457 2458 /* Control the compression with mode page 15. Algorithm not changed if zero. 2459 2460 The block descriptors are read and written because Sony SDT-7000 does not 2461 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2462 Including block descriptors should not cause any harm to other drives. */ 2463 2464 static int st_compression(struct scsi_tape * STp, int state) 2465 { 2466 int retval; 2467 int mpoffs; /* Offset to mode page start */ 2468 unsigned char *b_data = (STp->buffer)->b_data; 2469 DEB( char *name = tape_name(STp); ) 2470 2471 if (STp->ready != ST_READY) 2472 return (-EIO); 2473 2474 /* Read the current page contents */ 2475 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2476 if (retval) { 2477 DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", 2478 name)); 2479 return (-EIO); 2480 } 2481 2482 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2483 DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, 2484 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0))); 2485 2486 /* Check if compression can be changed */ 2487 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2488 DEBC(printk(ST_DEB_MSG "%s: Compression not supported.\n", name)); 2489 return (-EIO); 2490 } 2491 2492 /* Do the change */ 2493 if (state) { 2494 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2495 if (STp->c_algo != 0) 2496 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2497 } 2498 else { 2499 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2500 if (STp->c_algo != 0) 2501 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2502 } 2503 2504 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2505 if (retval) { 2506 DEBC(printk(ST_DEB_MSG "%s: Compression change failed.\n", name)); 2507 return (-EIO); 2508 } 2509 DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", 2510 name, state)); 2511 2512 STp->compression_changed = 1; 2513 return 0; 2514 } 2515 2516 2517 /* Process the load and unload commands (does unload if the load code is zero) */ 2518 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2519 { 2520 int retval = (-EIO), timeout; 2521 DEB( char *name = tape_name(STp); ) 2522 unsigned char cmd[MAX_COMMAND_SIZE]; 2523 struct st_partstat *STps; 2524 struct st_request *SRpnt; 2525 2526 if (STp->ready != ST_READY && !load_code) { 2527 if (STp->ready == ST_NO_TAPE) 2528 return (-ENOMEDIUM); 2529 else 2530 return (-EIO); 2531 } 2532 2533 memset(cmd, 0, MAX_COMMAND_SIZE); 2534 cmd[0] = START_STOP; 2535 if (load_code) 2536 cmd[4] |= 1; 2537 /* 2538 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2539 */ 2540 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2541 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2542 DEBC(printk(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", 2543 name, (cmd[4]) ? "" : "un", 2544 load_code - MT_ST_HPLOADER_OFFSET)); 2545 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2546 } 2547 if (STp->immediate) { 2548 cmd[1] = 1; /* Don't wait for completion */ 2549 timeout = STp->device->request_queue->rq_timeout; 2550 } 2551 else 2552 timeout = STp->long_timeout; 2553 2554 DEBC( 2555 if (!load_code) 2556 printk(ST_DEB_MSG "%s: Unloading tape.\n", name); 2557 else 2558 printk(ST_DEB_MSG "%s: Loading tape.\n", name); 2559 ); 2560 2561 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2562 timeout, MAX_RETRIES, 1); 2563 if (!SRpnt) 2564 return (STp->buffer)->syscall_result; 2565 2566 retval = (STp->buffer)->syscall_result; 2567 st_release_request(SRpnt); 2568 2569 if (!retval) { /* SCSI command successful */ 2570 2571 if (!load_code) { 2572 STp->rew_at_close = 0; 2573 STp->ready = ST_NO_TAPE; 2574 } 2575 else { 2576 STp->rew_at_close = STp->autorew_dev; 2577 retval = check_tape(STp, filp); 2578 if (retval > 0) 2579 retval = 0; 2580 } 2581 } 2582 else { 2583 STps = &(STp->ps[STp->partition]); 2584 STps->drv_file = STps->drv_block = (-1); 2585 } 2586 2587 return retval; 2588 } 2589 2590 #if DEBUG 2591 #define ST_DEB_FORWARD 0 2592 #define ST_DEB_BACKWARD 1 2593 static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd) 2594 { 2595 s32 sc; 2596 2597 sc = cmd[2] & 0x80 ? 0xff000000 : 0; 2598 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; 2599 if (direction) 2600 sc = -sc; 2601 printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, 2602 direction ? "backward" : "forward", sc, units); 2603 } 2604 #endif 2605 2606 2607 /* Internal ioctl function */ 2608 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2609 { 2610 int timeout; 2611 long ltmp; 2612 int ioctl_result; 2613 int chg_eof = 1; 2614 unsigned char cmd[MAX_COMMAND_SIZE]; 2615 struct st_request *SRpnt; 2616 struct st_partstat *STps; 2617 int fileno, blkno, at_sm, undone; 2618 int datalen = 0, direction = DMA_NONE; 2619 char *name = tape_name(STp); 2620 2621 WARN_ON(STp->buffer->do_dio != 0); 2622 if (STp->ready != ST_READY) { 2623 if (STp->ready == ST_NO_TAPE) 2624 return (-ENOMEDIUM); 2625 else 2626 return (-EIO); 2627 } 2628 timeout = STp->long_timeout; 2629 STps = &(STp->ps[STp->partition]); 2630 fileno = STps->drv_file; 2631 blkno = STps->drv_block; 2632 at_sm = STps->at_sm; 2633 2634 memset(cmd, 0, MAX_COMMAND_SIZE); 2635 switch (cmd_in) { 2636 case MTFSFM: 2637 chg_eof = 0; /* Changed from the FSF after this */ 2638 case MTFSF: 2639 cmd[0] = SPACE; 2640 cmd[1] = 0x01; /* Space FileMarks */ 2641 cmd[2] = (arg >> 16); 2642 cmd[3] = (arg >> 8); 2643 cmd[4] = arg; 2644 DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);) 2645 if (fileno >= 0) 2646 fileno += arg; 2647 blkno = 0; 2648 at_sm &= (arg == 0); 2649 break; 2650 case MTBSFM: 2651 chg_eof = 0; /* Changed from the FSF after this */ 2652 case MTBSF: 2653 cmd[0] = SPACE; 2654 cmd[1] = 0x01; /* Space FileMarks */ 2655 ltmp = (-arg); 2656 cmd[2] = (ltmp >> 16); 2657 cmd[3] = (ltmp >> 8); 2658 cmd[4] = ltmp; 2659 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);) 2660 if (fileno >= 0) 2661 fileno -= arg; 2662 blkno = (-1); /* We can't know the block number */ 2663 at_sm &= (arg == 0); 2664 break; 2665 case MTFSR: 2666 cmd[0] = SPACE; 2667 cmd[1] = 0x00; /* Space Blocks */ 2668 cmd[2] = (arg >> 16); 2669 cmd[3] = (arg >> 8); 2670 cmd[4] = arg; 2671 DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);) 2672 if (blkno >= 0) 2673 blkno += arg; 2674 at_sm &= (arg == 0); 2675 break; 2676 case MTBSR: 2677 cmd[0] = SPACE; 2678 cmd[1] = 0x00; /* Space Blocks */ 2679 ltmp = (-arg); 2680 cmd[2] = (ltmp >> 16); 2681 cmd[3] = (ltmp >> 8); 2682 cmd[4] = ltmp; 2683 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);) 2684 if (blkno >= 0) 2685 blkno -= arg; 2686 at_sm &= (arg == 0); 2687 break; 2688 case MTFSS: 2689 cmd[0] = SPACE; 2690 cmd[1] = 0x04; /* Space Setmarks */ 2691 cmd[2] = (arg >> 16); 2692 cmd[3] = (arg >> 8); 2693 cmd[4] = arg; 2694 DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);) 2695 if (arg != 0) { 2696 blkno = fileno = (-1); 2697 at_sm = 1; 2698 } 2699 break; 2700 case MTBSS: 2701 cmd[0] = SPACE; 2702 cmd[1] = 0x04; /* Space Setmarks */ 2703 ltmp = (-arg); 2704 cmd[2] = (ltmp >> 16); 2705 cmd[3] = (ltmp >> 8); 2706 cmd[4] = ltmp; 2707 DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) 2708 if (arg != 0) { 2709 blkno = fileno = (-1); 2710 at_sm = 1; 2711 } 2712 break; 2713 case MTWEOF: 2714 case MTWEOFI: 2715 case MTWSM: 2716 if (STp->write_prot) 2717 return (-EACCES); 2718 cmd[0] = WRITE_FILEMARKS; 2719 if (cmd_in == MTWSM) 2720 cmd[1] = 2; 2721 if (cmd_in == MTWEOFI || 2722 (cmd_in == MTWEOF && STp->immediate_filemark)) 2723 cmd[1] |= 1; 2724 cmd[2] = (arg >> 16); 2725 cmd[3] = (arg >> 8); 2726 cmd[4] = arg; 2727 timeout = STp->device->request_queue->rq_timeout; 2728 DEBC( 2729 if (cmd_in != MTWSM) 2730 printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, 2731 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); 2732 else 2733 printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, 2734 cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); 2735 ) 2736 if (fileno >= 0) 2737 fileno += arg; 2738 blkno = 0; 2739 at_sm = (cmd_in == MTWSM); 2740 break; 2741 case MTREW: 2742 cmd[0] = REZERO_UNIT; 2743 if (STp->immediate) { 2744 cmd[1] = 1; /* Don't wait for completion */ 2745 timeout = STp->device->request_queue->rq_timeout; 2746 } 2747 DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); 2748 fileno = blkno = at_sm = 0; 2749 break; 2750 case MTNOP: 2751 DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); 2752 return 0; /* Should do something ? */ 2753 break; 2754 case MTRETEN: 2755 cmd[0] = START_STOP; 2756 if (STp->immediate) { 2757 cmd[1] = 1; /* Don't wait for completion */ 2758 timeout = STp->device->request_queue->rq_timeout; 2759 } 2760 cmd[4] = 3; 2761 DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); 2762 fileno = blkno = at_sm = 0; 2763 break; 2764 case MTEOM: 2765 if (!STp->fast_mteom) { 2766 /* space to the end of tape */ 2767 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2768 fileno = STps->drv_file; 2769 if (STps->eof >= ST_EOD_1) 2770 return 0; 2771 /* The next lines would hide the number of spaced FileMarks 2772 That's why I inserted the previous lines. I had no luck 2773 with detecting EOM with FSF, so we go now to EOM. 2774 Joerg Weule */ 2775 } else 2776 fileno = (-1); 2777 cmd[0] = SPACE; 2778 cmd[1] = 3; 2779 DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", 2780 name)); 2781 blkno = -1; 2782 at_sm = 0; 2783 break; 2784 case MTERASE: 2785 if (STp->write_prot) 2786 return (-EACCES); 2787 cmd[0] = ERASE; 2788 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2789 if (STp->immediate) { 2790 cmd[1] |= 2; /* Don't wait for completion */ 2791 timeout = STp->device->request_queue->rq_timeout; 2792 } 2793 else 2794 timeout = STp->long_timeout * 8; 2795 2796 DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); 2797 fileno = blkno = at_sm = 0; 2798 break; 2799 case MTSETBLK: /* Set block length */ 2800 case MTSETDENSITY: /* Set tape density */ 2801 case MTSETDRVBUFFER: /* Set drive buffering */ 2802 case SET_DENS_AND_BLK: /* Set density and block size */ 2803 chg_eof = 0; 2804 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2805 return (-EIO); /* Not allowed if data in buffer */ 2806 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2807 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2808 STp->max_block > 0 && 2809 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2810 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2811 printk(KERN_WARNING "%s: Illegal block size.\n", name); 2812 return (-EINVAL); 2813 } 2814 cmd[0] = MODE_SELECT; 2815 if ((STp->use_pf & USE_PF)) 2816 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2817 cmd[4] = datalen = 12; 2818 direction = DMA_TO_DEVICE; 2819 2820 memset((STp->buffer)->b_data, 0, 12); 2821 if (cmd_in == MTSETDRVBUFFER) 2822 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2823 else 2824 (STp->buffer)->b_data[2] = 2825 STp->drv_buffer << 4; 2826 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2827 if (cmd_in == MTSETDENSITY) { 2828 (STp->buffer)->b_data[4] = arg; 2829 STp->density_changed = 1; /* At least we tried ;-) */ 2830 } else if (cmd_in == SET_DENS_AND_BLK) 2831 (STp->buffer)->b_data[4] = arg >> 24; 2832 else 2833 (STp->buffer)->b_data[4] = STp->density; 2834 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2835 ltmp = arg & MT_ST_BLKSIZE_MASK; 2836 if (cmd_in == MTSETBLK) 2837 STp->blksize_changed = 1; /* At least we tried ;-) */ 2838 } else 2839 ltmp = STp->block_size; 2840 (STp->buffer)->b_data[9] = (ltmp >> 16); 2841 (STp->buffer)->b_data[10] = (ltmp >> 8); 2842 (STp->buffer)->b_data[11] = ltmp; 2843 timeout = STp->device->request_queue->rq_timeout; 2844 DEBC( 2845 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2846 printk(ST_DEB_MSG 2847 "%s: Setting block size to %d bytes.\n", name, 2848 (STp->buffer)->b_data[9] * 65536 + 2849 (STp->buffer)->b_data[10] * 256 + 2850 (STp->buffer)->b_data[11]); 2851 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2852 printk(ST_DEB_MSG 2853 "%s: Setting density code to %x.\n", name, 2854 (STp->buffer)->b_data[4]); 2855 if (cmd_in == MTSETDRVBUFFER) 2856 printk(ST_DEB_MSG 2857 "%s: Setting drive buffer code to %d.\n", name, 2858 ((STp->buffer)->b_data[2] >> 4) & 7); 2859 ) 2860 break; 2861 default: 2862 return (-ENOSYS); 2863 } 2864 2865 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2866 timeout, MAX_RETRIES, 1); 2867 if (!SRpnt) 2868 return (STp->buffer)->syscall_result; 2869 2870 ioctl_result = (STp->buffer)->syscall_result; 2871 2872 if (!ioctl_result) { /* SCSI command successful */ 2873 st_release_request(SRpnt); 2874 SRpnt = NULL; 2875 STps->drv_block = blkno; 2876 STps->drv_file = fileno; 2877 STps->at_sm = at_sm; 2878 2879 if (cmd_in == MTBSFM) 2880 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2881 else if (cmd_in == MTFSFM) 2882 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2883 2884 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2885 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2886 if (STp->block_size != 0) { 2887 (STp->buffer)->buffer_blocks = 2888 (STp->buffer)->buffer_size / STp->block_size; 2889 } 2890 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2891 if (cmd_in == SET_DENS_AND_BLK) 2892 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2893 } else if (cmd_in == MTSETDRVBUFFER) 2894 STp->drv_buffer = (arg & 7); 2895 else if (cmd_in == MTSETDENSITY) 2896 STp->density = arg; 2897 2898 if (cmd_in == MTEOM) 2899 STps->eof = ST_EOD; 2900 else if (cmd_in == MTFSF) 2901 STps->eof = ST_FM; 2902 else if (chg_eof) 2903 STps->eof = ST_NOEOF; 2904 2905 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 2906 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 2907 } else { /* SCSI command was not completely successful. Don't return 2908 from this block without releasing the SCSI command block! */ 2909 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 2910 2911 if (cmdstatp->flags & SENSE_EOM) { 2912 if (cmd_in != MTBSF && cmd_in != MTBSFM && 2913 cmd_in != MTBSR && cmd_in != MTBSS) 2914 STps->eof = ST_EOM_OK; 2915 STps->drv_block = 0; 2916 } 2917 2918 if (cmdstatp->remainder_valid) 2919 undone = (int)cmdstatp->uremainder64; 2920 else 2921 undone = 0; 2922 2923 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 2924 cmdstatp->have_sense && 2925 (cmdstatp->flags & SENSE_EOM)) { 2926 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 2927 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 2928 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 2929 STps->eof = ST_NOEOF; 2930 } else { /* Writing EOF(s) failed */ 2931 if (fileno >= 0) 2932 fileno -= undone; 2933 if (undone < arg) 2934 STps->eof = ST_NOEOF; 2935 } 2936 STps->drv_file = fileno; 2937 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 2938 if (fileno >= 0) 2939 STps->drv_file = fileno - undone; 2940 else 2941 STps->drv_file = fileno; 2942 STps->drv_block = -1; 2943 STps->eof = ST_NOEOF; 2944 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 2945 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 2946 undone = (-undone); 2947 if (STps->drv_file >= 0) 2948 STps->drv_file = fileno + undone; 2949 STps->drv_block = 0; 2950 STps->eof = ST_NOEOF; 2951 } else if (cmd_in == MTFSR) { 2952 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 2953 if (STps->drv_file >= 0) 2954 STps->drv_file++; 2955 STps->drv_block = 0; 2956 STps->eof = ST_FM; 2957 } else { 2958 if (blkno >= undone) 2959 STps->drv_block = blkno - undone; 2960 else 2961 STps->drv_block = (-1); 2962 STps->eof = ST_NOEOF; 2963 } 2964 } else if (cmd_in == MTBSR) { 2965 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 2966 STps->drv_file--; 2967 STps->drv_block = (-1); 2968 } else { 2969 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 2970 undone = (-undone); 2971 if (STps->drv_block >= 0) 2972 STps->drv_block = blkno + undone; 2973 } 2974 STps->eof = ST_NOEOF; 2975 } else if (cmd_in == MTEOM) { 2976 STps->drv_file = (-1); 2977 STps->drv_block = (-1); 2978 STps->eof = ST_EOD; 2979 } else if (cmd_in == MTSETBLK || 2980 cmd_in == MTSETDENSITY || 2981 cmd_in == MTSETDRVBUFFER || 2982 cmd_in == SET_DENS_AND_BLK) { 2983 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 2984 !(STp->use_pf & PF_TESTED)) { 2985 /* Try the other possible state of Page Format if not 2986 already tried */ 2987 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 2988 st_release_request(SRpnt); 2989 SRpnt = NULL; 2990 return st_int_ioctl(STp, cmd_in, arg); 2991 } 2992 } else if (chg_eof) 2993 STps->eof = ST_NOEOF; 2994 2995 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 2996 STps->eof = ST_EOD; 2997 2998 st_release_request(SRpnt); 2999 SRpnt = NULL; 3000 } 3001 3002 return ioctl_result; 3003 } 3004 3005 3006 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3007 structure. */ 3008 3009 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3010 int logical) 3011 { 3012 int result; 3013 unsigned char scmd[MAX_COMMAND_SIZE]; 3014 struct st_request *SRpnt; 3015 DEB( char *name = tape_name(STp); ) 3016 3017 if (STp->ready != ST_READY) 3018 return (-EIO); 3019 3020 memset(scmd, 0, MAX_COMMAND_SIZE); 3021 if ((STp->device)->scsi_level < SCSI_2) { 3022 scmd[0] = QFA_REQUEST_BLOCK; 3023 scmd[4] = 3; 3024 } else { 3025 scmd[0] = READ_POSITION; 3026 if (!logical && !STp->scsi2_logical) 3027 scmd[1] = 1; 3028 } 3029 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3030 STp->device->request_queue->rq_timeout, 3031 MAX_READY_RETRIES, 1); 3032 if (!SRpnt) 3033 return (STp->buffer)->syscall_result; 3034 3035 if ((STp->buffer)->syscall_result != 0 || 3036 (STp->device->scsi_level >= SCSI_2 && 3037 ((STp->buffer)->b_data[0] & 4) != 0)) { 3038 *block = *partition = 0; 3039 DEBC(printk(ST_DEB_MSG "%s: Can't read tape position.\n", name)); 3040 result = (-EIO); 3041 } else { 3042 result = 0; 3043 if ((STp->device)->scsi_level < SCSI_2) { 3044 *block = ((STp->buffer)->b_data[0] << 16) 3045 + ((STp->buffer)->b_data[1] << 8) 3046 + (STp->buffer)->b_data[2]; 3047 *partition = 0; 3048 } else { 3049 *block = ((STp->buffer)->b_data[4] << 24) 3050 + ((STp->buffer)->b_data[5] << 16) 3051 + ((STp->buffer)->b_data[6] << 8) 3052 + (STp->buffer)->b_data[7]; 3053 *partition = (STp->buffer)->b_data[1]; 3054 if (((STp->buffer)->b_data[0] & 0x80) && 3055 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3056 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3057 } 3058 DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, 3059 *block, *partition)); 3060 } 3061 st_release_request(SRpnt); 3062 SRpnt = NULL; 3063 3064 return result; 3065 } 3066 3067 3068 /* Set the tape block and partition. Negative partition means that only the 3069 block should be set in vendor specific way. */ 3070 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3071 int logical) 3072 { 3073 struct st_partstat *STps; 3074 int result, p; 3075 unsigned int blk; 3076 int timeout; 3077 unsigned char scmd[MAX_COMMAND_SIZE]; 3078 struct st_request *SRpnt; 3079 DEB( char *name = tape_name(STp); ) 3080 3081 if (STp->ready != ST_READY) 3082 return (-EIO); 3083 timeout = STp->long_timeout; 3084 STps = &(STp->ps[STp->partition]); 3085 3086 DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", 3087 name, block, partition)); 3088 DEB(if (partition < 0) 3089 return (-EIO); ) 3090 3091 /* Update the location at the partition we are leaving */ 3092 if ((!STp->can_partitions && partition != 0) || 3093 partition >= ST_NBR_PARTITIONS) 3094 return (-EINVAL); 3095 if (partition != STp->partition) { 3096 if (get_location(STp, &blk, &p, 1)) 3097 STps->last_block_valid = 0; 3098 else { 3099 STps->last_block_valid = 1; 3100 STps->last_block_visited = blk; 3101 DEBC(printk(ST_DEB_MSG 3102 "%s: Visited block %d for partition %d saved.\n", 3103 name, blk, STp->partition)); 3104 } 3105 } 3106 3107 memset(scmd, 0, MAX_COMMAND_SIZE); 3108 if ((STp->device)->scsi_level < SCSI_2) { 3109 scmd[0] = QFA_SEEK_BLOCK; 3110 scmd[2] = (block >> 16); 3111 scmd[3] = (block >> 8); 3112 scmd[4] = block; 3113 scmd[5] = 0; 3114 } else { 3115 scmd[0] = SEEK_10; 3116 scmd[3] = (block >> 24); 3117 scmd[4] = (block >> 16); 3118 scmd[5] = (block >> 8); 3119 scmd[6] = block; 3120 if (!logical && !STp->scsi2_logical) 3121 scmd[1] = 4; 3122 if (STp->partition != partition) { 3123 scmd[1] |= 2; 3124 scmd[8] = partition; 3125 DEBC(printk(ST_DEB_MSG 3126 "%s: Trying to change partition from %d to %d\n", 3127 name, STp->partition, partition)); 3128 } 3129 } 3130 if (STp->immediate) { 3131 scmd[1] |= 1; /* Don't wait for completion */ 3132 timeout = STp->device->request_queue->rq_timeout; 3133 } 3134 3135 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3136 timeout, MAX_READY_RETRIES, 1); 3137 if (!SRpnt) 3138 return (STp->buffer)->syscall_result; 3139 3140 STps->drv_block = STps->drv_file = (-1); 3141 STps->eof = ST_NOEOF; 3142 if ((STp->buffer)->syscall_result != 0) { 3143 result = (-EIO); 3144 if (STp->can_partitions && 3145 (STp->device)->scsi_level >= SCSI_2 && 3146 (p = find_partition(STp)) >= 0) 3147 STp->partition = p; 3148 } else { 3149 if (STp->can_partitions) { 3150 STp->partition = partition; 3151 STps = &(STp->ps[partition]); 3152 if (!STps->last_block_valid || 3153 STps->last_block_visited != block) { 3154 STps->at_sm = 0; 3155 STps->rw = ST_IDLE; 3156 } 3157 } else 3158 STps->at_sm = 0; 3159 if (block == 0) 3160 STps->drv_block = STps->drv_file = 0; 3161 result = 0; 3162 } 3163 3164 st_release_request(SRpnt); 3165 SRpnt = NULL; 3166 3167 return result; 3168 } 3169 3170 3171 /* Find the current partition number for the drive status. Called from open and 3172 returns either partition number of negative error code. */ 3173 static int find_partition(struct scsi_tape *STp) 3174 { 3175 int i, partition; 3176 unsigned int block; 3177 3178 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3179 return i; 3180 if (partition >= ST_NBR_PARTITIONS) 3181 return (-EIO); 3182 return partition; 3183 } 3184 3185 3186 /* Change the partition if necessary */ 3187 static int switch_partition(struct scsi_tape *STp) 3188 { 3189 struct st_partstat *STps; 3190 3191 if (STp->partition == STp->new_partition) 3192 return 0; 3193 STps = &(STp->ps[STp->new_partition]); 3194 if (!STps->last_block_valid) 3195 STps->last_block_visited = 0; 3196 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3197 } 3198 3199 /* Functions for reading and writing the medium partition mode page. */ 3200 3201 #define PART_PAGE 0x11 3202 #define PART_PAGE_FIXED_LENGTH 8 3203 3204 #define PP_OFF_MAX_ADD_PARTS 2 3205 #define PP_OFF_NBR_ADD_PARTS 3 3206 #define PP_OFF_FLAGS 4 3207 #define PP_OFF_PART_UNITS 6 3208 #define PP_OFF_RESERVED 7 3209 3210 #define PP_BIT_IDP 0x20 3211 #define PP_MSK_PSUM_MB 0x10 3212 3213 /* Get the number of partitions on the tape. As a side effect reads the 3214 mode page into the tape buffer. */ 3215 static int nbr_partitions(struct scsi_tape *STp) 3216 { 3217 int result; 3218 DEB( char *name = tape_name(STp); ) 3219 3220 if (STp->ready != ST_READY) 3221 return (-EIO); 3222 3223 result = read_mode_page(STp, PART_PAGE, 1); 3224 3225 if (result) { 3226 DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", 3227 name)); 3228 result = (-EIO); 3229 } else { 3230 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3231 PP_OFF_NBR_ADD_PARTS] + 1; 3232 DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, result)); 3233 } 3234 3235 return result; 3236 } 3237 3238 3239 /* Partition the tape into two partitions if size > 0 or one partition if 3240 size == 0. 3241 3242 The block descriptors are read and written because Sony SDT-7000 does not 3243 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3244 3245 My HP C1533A drive returns only one partition size field. This is used to 3246 set the size of partition 1. There is no size field for the default partition. 3247 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3248 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3249 The following algorithm is used to accommodate both drives: if the number of 3250 partition size fields is greater than the maximum number of additional partitions 3251 in the mode page, the second field is used. Otherwise the first field is used. 3252 3253 For Seagate DDS drives the page length must be 8 when no partitions is defined 3254 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3255 is acceptable also to some other old drives and enforced if the first partition 3256 size field is used for the first additional partition size. 3257 */ 3258 static int partition_tape(struct scsi_tape *STp, int size) 3259 { 3260 char *name = tape_name(STp); 3261 int result; 3262 int pgo, psd_cnt, psdo; 3263 unsigned char *bp; 3264 3265 result = read_mode_page(STp, PART_PAGE, 0); 3266 if (result) { 3267 DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); 3268 return result; 3269 } 3270 /* The mode page is in the buffer. Let's modify it and write it. */ 3271 bp = (STp->buffer)->b_data; 3272 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3273 DEBC(printk(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", 3274 name, bp[pgo + MP_OFF_PAGE_LENGTH] + 2)); 3275 3276 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3277 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3278 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { 3279 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ 3280 psdo += 2; 3281 } 3282 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3283 3284 DEBC(printk("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, 3285 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3286 bp[pgo + PP_OFF_NBR_ADD_PARTS])); 3287 3288 if (size <= 0) { 3289 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3290 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3291 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3292 DEBC(printk(ST_DEB_MSG "%s: Formatting tape with one partition.\n", 3293 name)); 3294 } else { 3295 bp[psdo] = (size >> 8) & 0xff; 3296 bp[psdo + 1] = size & 0xff; 3297 bp[pgo + 3] = 1; 3298 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3299 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3300 DEBC(printk(ST_DEB_MSG 3301 "%s: Formatting tape with two partitions (1 = %d MB).\n", 3302 name, size)); 3303 } 3304 bp[pgo + PP_OFF_PART_UNITS] = 0; 3305 bp[pgo + PP_OFF_RESERVED] = 0; 3306 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; 3307 3308 result = write_mode_page(STp, PART_PAGE, 1); 3309 if (result) { 3310 printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); 3311 result = (-EIO); 3312 } 3313 3314 return result; 3315 } 3316 3317 3318 3319 /* The ioctl command */ 3320 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3321 { 3322 int i, cmd_nr, cmd_type, bt; 3323 int retval = 0; 3324 unsigned int blk; 3325 struct scsi_tape *STp = file->private_data; 3326 struct st_modedef *STm; 3327 struct st_partstat *STps; 3328 char *name = tape_name(STp); 3329 void __user *p = (void __user *)arg; 3330 3331 if (mutex_lock_interruptible(&STp->lock)) 3332 return -ERESTARTSYS; 3333 3334 DEB( 3335 if (debugging && !STp->in_use) { 3336 printk(ST_DEB_MSG "%s: Incorrect device.\n", name); 3337 retval = (-EIO); 3338 goto out; 3339 } ) /* end DEB */ 3340 3341 STm = &(STp->modes[STp->current_mode]); 3342 STps = &(STp->ps[STp->partition]); 3343 3344 /* 3345 * If we are in the middle of error recovery, don't let anyone 3346 * else try and use this device. Also, if error recovery fails, it 3347 * may try and take the device offline, in which case all further 3348 * access to the device is prohibited. 3349 */ 3350 retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, 3351 file->f_flags & O_NDELAY); 3352 if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) 3353 goto out; 3354 retval = 0; 3355 3356 cmd_type = _IOC_TYPE(cmd_in); 3357 cmd_nr = _IOC_NR(cmd_in); 3358 3359 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3360 struct mtop mtc; 3361 3362 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3363 retval = (-EINVAL); 3364 goto out; 3365 } 3366 3367 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3368 if (i) { 3369 retval = (-EFAULT); 3370 goto out; 3371 } 3372 3373 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3374 printk(KERN_WARNING 3375 "%s: MTSETDRVBUFFER only allowed for root.\n", name); 3376 retval = (-EPERM); 3377 goto out; 3378 } 3379 if (!STm->defined && 3380 (mtc.mt_op != MTSETDRVBUFFER && 3381 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3382 retval = (-ENXIO); 3383 goto out; 3384 } 3385 3386 if (!STp->pos_unknown) { 3387 3388 if (STps->eof == ST_FM_HIT) { 3389 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3390 mtc.mt_op == MTEOM) { 3391 mtc.mt_count -= 1; 3392 if (STps->drv_file >= 0) 3393 STps->drv_file += 1; 3394 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3395 mtc.mt_count += 1; 3396 if (STps->drv_file >= 0) 3397 STps->drv_file += 1; 3398 } 3399 } 3400 3401 if (mtc.mt_op == MTSEEK) { 3402 /* Old position must be restored if partition will be 3403 changed */ 3404 i = !STp->can_partitions || 3405 (STp->new_partition != STp->partition); 3406 } else { 3407 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3408 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3409 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3410 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3411 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3412 mtc.mt_op == MTCOMPRESSION; 3413 } 3414 i = flush_buffer(STp, i); 3415 if (i < 0) { 3416 retval = i; 3417 goto out; 3418 } 3419 if (STps->rw == ST_WRITING && 3420 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3421 mtc.mt_op == MTSEEK || 3422 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3423 i = st_int_ioctl(STp, MTWEOF, 1); 3424 if (i < 0) { 3425 retval = i; 3426 goto out; 3427 } 3428 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3429 mtc.mt_count++; 3430 STps->rw = ST_IDLE; 3431 } 3432 3433 } else { 3434 /* 3435 * If there was a bus reset, block further access 3436 * to this device. If the user wants to rewind the tape, 3437 * then reset the flag and allow access again. 3438 */ 3439 if (mtc.mt_op != MTREW && 3440 mtc.mt_op != MTOFFL && 3441 mtc.mt_op != MTRETEN && 3442 mtc.mt_op != MTERASE && 3443 mtc.mt_op != MTSEEK && 3444 mtc.mt_op != MTEOM) { 3445 retval = (-EIO); 3446 goto out; 3447 } 3448 reset_state(STp); 3449 /* remove this when the midlevel properly clears was_reset */ 3450 STp->device->was_reset = 0; 3451 } 3452 3453 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3454 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3455 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3456 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3457 3458 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3459 do_door_lock(STp, 0); /* Ignore result! */ 3460 3461 if (mtc.mt_op == MTSETDRVBUFFER && 3462 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3463 retval = st_set_options(STp, mtc.mt_count); 3464 goto out; 3465 } 3466 3467 if (mtc.mt_op == MTSETPART) { 3468 if (!STp->can_partitions || 3469 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3470 retval = (-EINVAL); 3471 goto out; 3472 } 3473 if (mtc.mt_count >= STp->nbr_partitions && 3474 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3475 retval = (-EIO); 3476 goto out; 3477 } 3478 if (mtc.mt_count >= STp->nbr_partitions) { 3479 retval = (-EINVAL); 3480 goto out; 3481 } 3482 STp->new_partition = mtc.mt_count; 3483 retval = 0; 3484 goto out; 3485 } 3486 3487 if (mtc.mt_op == MTMKPART) { 3488 if (!STp->can_partitions) { 3489 retval = (-EINVAL); 3490 goto out; 3491 } 3492 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || 3493 (i = partition_tape(STp, mtc.mt_count)) < 0) { 3494 retval = i; 3495 goto out; 3496 } 3497 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3498 STp->ps[i].rw = ST_IDLE; 3499 STp->ps[i].at_sm = 0; 3500 STp->ps[i].last_block_valid = 0; 3501 } 3502 STp->partition = STp->new_partition = 0; 3503 STp->nbr_partitions = 1; /* Bad guess ?-) */ 3504 STps->drv_block = STps->drv_file = 0; 3505 retval = 0; 3506 goto out; 3507 } 3508 3509 if (mtc.mt_op == MTSEEK) { 3510 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3511 if (!STp->can_partitions) 3512 STp->ps[0].rw = ST_IDLE; 3513 retval = i; 3514 goto out; 3515 } 3516 3517 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3518 retval = do_load_unload(STp, file, 0); 3519 goto out; 3520 } 3521 3522 if (mtc.mt_op == MTLOAD) { 3523 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3524 goto out; 3525 } 3526 3527 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3528 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3529 goto out; 3530 } 3531 3532 if (STp->can_partitions && STp->ready == ST_READY && 3533 (i = switch_partition(STp)) < 0) { 3534 retval = i; 3535 goto out; 3536 } 3537 3538 if (mtc.mt_op == MTCOMPRESSION) 3539 retval = st_compression(STp, (mtc.mt_count & 1)); 3540 else 3541 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3542 goto out; 3543 } 3544 if (!STm->defined) { 3545 retval = (-ENXIO); 3546 goto out; 3547 } 3548 3549 if ((i = flush_buffer(STp, 0)) < 0) { 3550 retval = i; 3551 goto out; 3552 } 3553 if (STp->can_partitions && 3554 (i = switch_partition(STp)) < 0) { 3555 retval = i; 3556 goto out; 3557 } 3558 3559 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3560 struct mtget mt_status; 3561 3562 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3563 retval = (-EINVAL); 3564 goto out; 3565 } 3566 3567 mt_status.mt_type = STp->tape_type; 3568 mt_status.mt_dsreg = 3569 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3570 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3571 mt_status.mt_blkno = STps->drv_block; 3572 mt_status.mt_fileno = STps->drv_file; 3573 if (STp->block_size != 0) { 3574 if (STps->rw == ST_WRITING) 3575 mt_status.mt_blkno += 3576 (STp->buffer)->buffer_bytes / STp->block_size; 3577 else if (STps->rw == ST_READING) 3578 mt_status.mt_blkno -= 3579 ((STp->buffer)->buffer_bytes + 3580 STp->block_size - 1) / STp->block_size; 3581 } 3582 3583 mt_status.mt_gstat = 0; 3584 if (STp->drv_write_prot) 3585 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3586 if (mt_status.mt_blkno == 0) { 3587 if (mt_status.mt_fileno == 0) 3588 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3589 else 3590 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3591 } 3592 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3593 mt_status.mt_resid = STp->partition; 3594 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3595 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3596 else if (STps->eof >= ST_EOM_OK) 3597 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3598 if (STp->density == 1) 3599 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3600 else if (STp->density == 2) 3601 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3602 else if (STp->density == 3) 3603 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3604 if (STp->ready == ST_READY) 3605 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3606 if (STp->ready == ST_NO_TAPE) 3607 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3608 if (STps->at_sm) 3609 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3610 if (STm->do_async_writes || 3611 (STm->do_buffer_writes && STp->block_size != 0) || 3612 STp->drv_buffer != 0) 3613 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3614 if (STp->cleaning_req) 3615 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3616 3617 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3618 if (i) { 3619 retval = (-EFAULT); 3620 goto out; 3621 } 3622 3623 STp->recover_reg = 0; /* Clear after read */ 3624 retval = 0; 3625 goto out; 3626 } /* End of MTIOCGET */ 3627 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3628 struct mtpos mt_pos; 3629 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3630 retval = (-EINVAL); 3631 goto out; 3632 } 3633 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3634 retval = i; 3635 goto out; 3636 } 3637 mt_pos.mt_blkno = blk; 3638 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3639 if (i) 3640 retval = (-EFAULT); 3641 goto out; 3642 } 3643 mutex_unlock(&STp->lock); 3644 switch (cmd_in) { 3645 case SCSI_IOCTL_GET_IDLUN: 3646 case SCSI_IOCTL_GET_BUS_NUMBER: 3647 break; 3648 default: 3649 if ((cmd_in == SG_IO || 3650 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3651 cmd_in == CDROM_SEND_PACKET) && 3652 !capable(CAP_SYS_RAWIO)) 3653 i = -EPERM; 3654 else 3655 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3656 file->f_mode, cmd_in, p); 3657 if (i != -ENOTTY) 3658 return i; 3659 break; 3660 } 3661 retval = scsi_ioctl(STp->device, cmd_in, p); 3662 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3663 STp->rew_at_close = 0; 3664 STp->ready = ST_NO_TAPE; 3665 } 3666 return retval; 3667 3668 out: 3669 mutex_unlock(&STp->lock); 3670 return retval; 3671 } 3672 3673 #ifdef CONFIG_COMPAT 3674 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3675 { 3676 struct scsi_tape *STp = file->private_data; 3677 struct scsi_device *sdev = STp->device; 3678 int ret = -ENOIOCTLCMD; 3679 if (sdev->host->hostt->compat_ioctl) { 3680 3681 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3682 3683 } 3684 return ret; 3685 } 3686 #endif 3687 3688 3689 3690 /* Try to allocate a new tape buffer. Calling function must not hold 3691 dev_arr_lock. */ 3692 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3693 { 3694 struct st_buffer *tb; 3695 3696 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); 3697 if (!tb) { 3698 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3699 return NULL; 3700 } 3701 tb->frp_segs = 0; 3702 tb->use_sg = max_sg; 3703 tb->dma = need_dma; 3704 tb->buffer_size = 0; 3705 3706 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), 3707 GFP_ATOMIC); 3708 if (!tb->reserved_pages) { 3709 kfree(tb); 3710 return NULL; 3711 } 3712 3713 return tb; 3714 } 3715 3716 3717 /* Try to allocate enough space in the tape buffer */ 3718 #define ST_MAX_ORDER 6 3719 3720 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3721 { 3722 int segs, nbr, max_segs, b_size, order, got; 3723 gfp_t priority; 3724 3725 if (new_size <= STbuffer->buffer_size) 3726 return 1; 3727 3728 if (STbuffer->buffer_size <= PAGE_SIZE) 3729 normalize_buffer(STbuffer); /* Avoid extra segment */ 3730 3731 max_segs = STbuffer->use_sg; 3732 nbr = max_segs - STbuffer->frp_segs; 3733 if (nbr <= 0) 3734 return 0; 3735 3736 priority = GFP_KERNEL | __GFP_NOWARN; 3737 if (need_dma) 3738 priority |= GFP_DMA; 3739 3740 if (STbuffer->cleared) 3741 priority |= __GFP_ZERO; 3742 3743 if (STbuffer->frp_segs) { 3744 order = STbuffer->reserved_page_order; 3745 b_size = PAGE_SIZE << order; 3746 } else { 3747 for (b_size = PAGE_SIZE, order = 0; 3748 order < ST_MAX_ORDER && 3749 max_segs * (PAGE_SIZE << order) < new_size; 3750 order++, b_size *= 2) 3751 ; /* empty */ 3752 STbuffer->reserved_page_order = order; 3753 } 3754 if (max_segs * (PAGE_SIZE << order) < new_size) { 3755 if (order == ST_MAX_ORDER) 3756 return 0; 3757 normalize_buffer(STbuffer); 3758 return enlarge_buffer(STbuffer, new_size, need_dma); 3759 } 3760 3761 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3762 segs < max_segs && got < new_size;) { 3763 struct page *page; 3764 3765 page = alloc_pages(priority, order); 3766 if (!page) { 3767 DEB(STbuffer->buffer_size = got); 3768 normalize_buffer(STbuffer); 3769 return 0; 3770 } 3771 3772 STbuffer->frp_segs += 1; 3773 got += b_size; 3774 STbuffer->buffer_size = got; 3775 STbuffer->reserved_pages[segs] = page; 3776 segs++; 3777 } 3778 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3779 3780 return 1; 3781 } 3782 3783 3784 /* Make sure that no data from previous user is in the internal buffer */ 3785 static void clear_buffer(struct st_buffer * st_bp) 3786 { 3787 int i; 3788 3789 for (i=0; i < st_bp->frp_segs; i++) 3790 memset(page_address(st_bp->reserved_pages[i]), 0, 3791 PAGE_SIZE << st_bp->reserved_page_order); 3792 st_bp->cleared = 1; 3793 } 3794 3795 3796 /* Release the extra buffer */ 3797 static void normalize_buffer(struct st_buffer * STbuffer) 3798 { 3799 int i, order = STbuffer->reserved_page_order; 3800 3801 for (i = 0; i < STbuffer->frp_segs; i++) { 3802 __free_pages(STbuffer->reserved_pages[i], order); 3803 STbuffer->buffer_size -= (PAGE_SIZE << order); 3804 } 3805 STbuffer->frp_segs = 0; 3806 STbuffer->sg_segs = 0; 3807 STbuffer->reserved_page_order = 0; 3808 STbuffer->map_data.offset = 0; 3809 } 3810 3811 3812 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3813 negative error code. */ 3814 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3815 { 3816 int i, cnt, res, offset; 3817 int length = PAGE_SIZE << st_bp->reserved_page_order; 3818 3819 for (i = 0, offset = st_bp->buffer_bytes; 3820 i < st_bp->frp_segs && offset >= length; i++) 3821 offset -= length; 3822 if (i == st_bp->frp_segs) { /* Should never happen */ 3823 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 3824 return (-EIO); 3825 } 3826 for (; i < st_bp->frp_segs && do_count > 0; i++) { 3827 struct page *page = st_bp->reserved_pages[i]; 3828 cnt = length - offset < do_count ? length - offset : do_count; 3829 res = copy_from_user(page_address(page) + offset, ubp, cnt); 3830 if (res) 3831 return (-EFAULT); 3832 do_count -= cnt; 3833 st_bp->buffer_bytes += cnt; 3834 ubp += cnt; 3835 offset = 0; 3836 } 3837 if (do_count) /* Should never happen */ 3838 return (-EIO); 3839 3840 return 0; 3841 } 3842 3843 3844 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 3845 negative error code. */ 3846 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 3847 { 3848 int i, cnt, res, offset; 3849 int length = PAGE_SIZE << st_bp->reserved_page_order; 3850 3851 for (i = 0, offset = st_bp->read_pointer; 3852 i < st_bp->frp_segs && offset >= length; i++) 3853 offset -= length; 3854 if (i == st_bp->frp_segs) { /* Should never happen */ 3855 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 3856 return (-EIO); 3857 } 3858 for (; i < st_bp->frp_segs && do_count > 0; i++) { 3859 struct page *page = st_bp->reserved_pages[i]; 3860 cnt = length - offset < do_count ? length - offset : do_count; 3861 res = copy_to_user(ubp, page_address(page) + offset, cnt); 3862 if (res) 3863 return (-EFAULT); 3864 do_count -= cnt; 3865 st_bp->buffer_bytes -= cnt; 3866 st_bp->read_pointer += cnt; 3867 ubp += cnt; 3868 offset = 0; 3869 } 3870 if (do_count) /* Should never happen */ 3871 return (-EIO); 3872 3873 return 0; 3874 } 3875 3876 3877 /* Move data towards start of buffer */ 3878 static void move_buffer_data(struct st_buffer * st_bp, int offset) 3879 { 3880 int src_seg, dst_seg, src_offset = 0, dst_offset; 3881 int count, total; 3882 int length = PAGE_SIZE << st_bp->reserved_page_order; 3883 3884 if (offset == 0) 3885 return; 3886 3887 total=st_bp->buffer_bytes - offset; 3888 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 3889 src_offset = offset; 3890 if (src_offset < length) 3891 break; 3892 offset -= length; 3893 } 3894 3895 st_bp->buffer_bytes = st_bp->read_pointer = total; 3896 for (dst_seg=dst_offset=0; total > 0; ) { 3897 struct page *dpage = st_bp->reserved_pages[dst_seg]; 3898 struct page *spage = st_bp->reserved_pages[src_seg]; 3899 3900 count = min(length - dst_offset, length - src_offset); 3901 memmove(page_address(dpage) + dst_offset, 3902 page_address(spage) + src_offset, count); 3903 src_offset += count; 3904 if (src_offset >= length) { 3905 src_seg++; 3906 src_offset = 0; 3907 } 3908 dst_offset += count; 3909 if (dst_offset >= length) { 3910 dst_seg++; 3911 dst_offset = 0; 3912 } 3913 total -= count; 3914 } 3915 } 3916 3917 /* Validate the options from command line or module parameters */ 3918 static void validate_options(void) 3919 { 3920 if (buffer_kbs > 0) 3921 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 3922 if (max_sg_segs >= ST_FIRST_SG) 3923 st_max_sg_segs = max_sg_segs; 3924 } 3925 3926 #ifndef MODULE 3927 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 3928 */ 3929 static int __init st_setup(char *str) 3930 { 3931 int i, len, ints[5]; 3932 char *stp; 3933 3934 stp = get_options(str, ARRAY_SIZE(ints), ints); 3935 3936 if (ints[0] > 0) { 3937 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 3938 if (parms[i].val) 3939 *parms[i].val = ints[i + 1]; 3940 } else { 3941 while (stp != NULL) { 3942 for (i = 0; i < ARRAY_SIZE(parms); i++) { 3943 len = strlen(parms[i].name); 3944 if (!strncmp(stp, parms[i].name, len) && 3945 (*(stp + len) == ':' || *(stp + len) == '=')) { 3946 if (parms[i].val) 3947 *parms[i].val = 3948 simple_strtoul(stp + len + 1, NULL, 0); 3949 else 3950 printk(KERN_WARNING "st: Obsolete parameter %s\n", 3951 parms[i].name); 3952 break; 3953 } 3954 } 3955 if (i >= ARRAY_SIZE(parms)) 3956 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 3957 stp); 3958 stp = strchr(stp, ','); 3959 if (stp) 3960 stp++; 3961 } 3962 } 3963 3964 validate_options(); 3965 3966 return 1; 3967 } 3968 3969 __setup("st=", st_setup); 3970 3971 #endif 3972 3973 static const struct file_operations st_fops = 3974 { 3975 .owner = THIS_MODULE, 3976 .read = st_read, 3977 .write = st_write, 3978 .unlocked_ioctl = st_ioctl, 3979 #ifdef CONFIG_COMPAT 3980 .compat_ioctl = st_compat_ioctl, 3981 #endif 3982 .open = st_open, 3983 .flush = st_flush, 3984 .release = st_release, 3985 .llseek = noop_llseek, 3986 }; 3987 3988 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 3989 { 3990 int i, error; 3991 dev_t cdev_devno; 3992 struct cdev *cdev; 3993 struct device *dev; 3994 struct st_modedef *STm = &(tape->modes[mode]); 3995 char name[10]; 3996 int dev_num = tape->index; 3997 3998 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 3999 4000 cdev = cdev_alloc(); 4001 if (!cdev) { 4002 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4003 error = -ENOMEM; 4004 goto out; 4005 } 4006 cdev->owner = THIS_MODULE; 4007 cdev->ops = &st_fops; 4008 4009 error = cdev_add(cdev, cdev_devno, 1); 4010 if (error) { 4011 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4012 rew ? "non" : "auto", mode); 4013 pr_err("st%d: Device not attached.\n", dev_num); 4014 goto out_free; 4015 } 4016 STm->cdevs[rew] = cdev; 4017 4018 i = mode << (4 - ST_NBR_MODE_BITS); 4019 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4020 tape->disk->disk_name, st_formats[i]); 4021 4022 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4023 cdev_devno, &tape->modes[mode], "%s", name); 4024 if (IS_ERR(dev)) { 4025 pr_err("st%d: device_create failed\n", dev_num); 4026 error = PTR_ERR(dev); 4027 goto out_free; 4028 } 4029 4030 STm->devs[rew] = dev; 4031 4032 return 0; 4033 out_free: 4034 cdev_del(STm->cdevs[rew]); 4035 STm->cdevs[rew] = NULL; 4036 out: 4037 return error; 4038 } 4039 4040 static int create_cdevs(struct scsi_tape *tape) 4041 { 4042 int mode, error; 4043 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4044 error = create_one_cdev(tape, mode, 0); 4045 if (error) 4046 return error; 4047 error = create_one_cdev(tape, mode, 1); 4048 if (error) 4049 return error; 4050 } 4051 4052 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4053 &tape->modes[0].devs[0]->kobj, "tape"); 4054 } 4055 4056 static void remove_cdevs(struct scsi_tape *tape) 4057 { 4058 int mode, rew; 4059 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4060 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4061 struct st_modedef *STm = &(tape->modes[mode]); 4062 for (rew = 0; rew < 2; rew++) { 4063 if (STm->cdevs[rew]) 4064 cdev_del(STm->cdevs[rew]); 4065 if (STm->devs[rew]) 4066 device_unregister(STm->devs[rew]); 4067 } 4068 } 4069 } 4070 4071 static int st_probe(struct device *dev) 4072 { 4073 struct scsi_device *SDp = to_scsi_device(dev); 4074 struct gendisk *disk = NULL; 4075 struct scsi_tape *tpnt = NULL; 4076 struct st_modedef *STm; 4077 struct st_partstat *STps; 4078 struct st_buffer *buffer; 4079 int i, dev_num, error; 4080 char *stp; 4081 4082 if (SDp->type != TYPE_TAPE) 4083 return -ENODEV; 4084 if ((stp = st_incompatible(SDp))) { 4085 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4086 printk(KERN_INFO "st: The suggested driver is %s.\n", stp); 4087 return -ENODEV; 4088 } 4089 4090 i = queue_max_segments(SDp->request_queue); 4091 if (st_max_sg_segs < i) 4092 i = st_max_sg_segs; 4093 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4094 if (buffer == NULL) { 4095 printk(KERN_ERR 4096 "st: Can't allocate new tape buffer. Device not attached.\n"); 4097 goto out; 4098 } 4099 4100 disk = alloc_disk(1); 4101 if (!disk) { 4102 printk(KERN_ERR "st: out of memory. Device not attached.\n"); 4103 goto out_buffer_free; 4104 } 4105 4106 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); 4107 if (tpnt == NULL) { 4108 printk(KERN_ERR "st: Can't allocate device descriptor.\n"); 4109 goto out_put_disk; 4110 } 4111 kref_init(&tpnt->kref); 4112 tpnt->disk = disk; 4113 disk->private_data = &tpnt->driver; 4114 disk->queue = SDp->request_queue; 4115 tpnt->driver = &st_template; 4116 4117 tpnt->device = SDp; 4118 if (SDp->scsi_level <= 2) 4119 tpnt->tape_type = MT_ISSCSI1; 4120 else 4121 tpnt->tape_type = MT_ISSCSI2; 4122 4123 tpnt->buffer = buffer; 4124 tpnt->buffer->last_SRpnt = NULL; 4125 4126 tpnt->inited = 0; 4127 tpnt->dirty = 0; 4128 tpnt->in_use = 0; 4129 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4130 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4131 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4132 tpnt->density = 0; 4133 tpnt->do_auto_lock = ST_AUTO_LOCK; 4134 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4135 tpnt->can_partitions = 0; 4136 tpnt->two_fm = ST_TWO_FM; 4137 tpnt->fast_mteom = ST_FAST_MTEOM; 4138 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4139 tpnt->sili = ST_SILI; 4140 tpnt->immediate = ST_NOWAIT; 4141 tpnt->immediate_filemark = 0; 4142 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4143 tpnt->partition = 0; 4144 tpnt->new_partition = 0; 4145 tpnt->nbr_partitions = 0; 4146 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4147 tpnt->long_timeout = ST_LONG_TIMEOUT; 4148 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4149 4150 for (i = 0; i < ST_NBR_MODES; i++) { 4151 STm = &(tpnt->modes[i]); 4152 STm->defined = 0; 4153 STm->sysv = ST_SYSV; 4154 STm->defaults_for_writes = 0; 4155 STm->do_async_writes = ST_ASYNC_WRITES; 4156 STm->do_buffer_writes = ST_BUFFER_WRITES; 4157 STm->do_read_ahead = ST_READ_AHEAD; 4158 STm->default_compression = ST_DONT_TOUCH; 4159 STm->default_blksize = (-1); /* No forced size */ 4160 STm->default_density = (-1); /* No forced density */ 4161 STm->tape = tpnt; 4162 } 4163 4164 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4165 STps = &(tpnt->ps[i]); 4166 STps->rw = ST_IDLE; 4167 STps->eof = ST_NOEOF; 4168 STps->at_sm = 0; 4169 STps->last_block_valid = 0; 4170 STps->drv_block = (-1); 4171 STps->drv_file = (-1); 4172 } 4173 4174 tpnt->current_mode = 0; 4175 tpnt->modes[0].defined = 1; 4176 4177 tpnt->density_changed = tpnt->compression_changed = 4178 tpnt->blksize_changed = 0; 4179 mutex_init(&tpnt->lock); 4180 4181 if (!idr_pre_get(&st_index_idr, GFP_KERNEL)) { 4182 pr_warn("st: idr expansion failed\n"); 4183 error = -ENOMEM; 4184 goto out_put_disk; 4185 } 4186 4187 spin_lock(&st_index_lock); 4188 error = idr_get_new(&st_index_idr, tpnt, &dev_num); 4189 spin_unlock(&st_index_lock); 4190 if (error) { 4191 pr_warn("st: idr allocation failed: %d\n", error); 4192 goto out_put_disk; 4193 } 4194 4195 if (dev_num > ST_MAX_TAPES) { 4196 pr_err("st: Too many tape devices (max. %d).\n", ST_MAX_TAPES); 4197 goto out_put_index; 4198 } 4199 4200 tpnt->index = dev_num; 4201 sprintf(disk->disk_name, "st%d", dev_num); 4202 4203 dev_set_drvdata(dev, tpnt); 4204 4205 4206 error = create_cdevs(tpnt); 4207 if (error) 4208 goto out_remove_devs; 4209 scsi_autopm_put_device(SDp); 4210 4211 sdev_printk(KERN_NOTICE, SDp, 4212 "Attached scsi tape %s\n", tape_name(tpnt)); 4213 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4214 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4215 queue_dma_alignment(SDp->request_queue) + 1); 4216 4217 return 0; 4218 4219 out_remove_devs: 4220 remove_cdevs(tpnt); 4221 out_put_index: 4222 spin_lock(&st_index_lock); 4223 idr_remove(&st_index_idr, dev_num); 4224 spin_unlock(&st_index_lock); 4225 out_put_disk: 4226 put_disk(disk); 4227 kfree(tpnt); 4228 out_buffer_free: 4229 kfree(buffer); 4230 out: 4231 return -ENODEV; 4232 }; 4233 4234 4235 static int st_remove(struct device *dev) 4236 { 4237 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4238 int index = tpnt->index; 4239 4240 scsi_autopm_get_device(to_scsi_device(dev)); 4241 remove_cdevs(tpnt); 4242 4243 mutex_lock(&st_ref_mutex); 4244 kref_put(&tpnt->kref, scsi_tape_release); 4245 mutex_unlock(&st_ref_mutex); 4246 spin_lock(&st_index_lock); 4247 idr_remove(&st_index_idr, index); 4248 spin_unlock(&st_index_lock); 4249 return 0; 4250 } 4251 4252 /** 4253 * scsi_tape_release - Called to free the Scsi_Tape structure 4254 * @kref: pointer to embedded kref 4255 * 4256 * st_ref_mutex must be held entering this routine. Because it is 4257 * called on last put, you should always use the scsi_tape_get() 4258 * scsi_tape_put() helpers which manipulate the semaphore directly 4259 * and never do a direct kref_put(). 4260 **/ 4261 static void scsi_tape_release(struct kref *kref) 4262 { 4263 struct scsi_tape *tpnt = to_scsi_tape(kref); 4264 struct gendisk *disk = tpnt->disk; 4265 4266 tpnt->device = NULL; 4267 4268 if (tpnt->buffer) { 4269 normalize_buffer(tpnt->buffer); 4270 kfree(tpnt->buffer->reserved_pages); 4271 kfree(tpnt->buffer); 4272 } 4273 4274 disk->private_data = NULL; 4275 put_disk(disk); 4276 kfree(tpnt); 4277 return; 4278 } 4279 4280 static struct class st_sysfs_class = { 4281 .name = "scsi_tape", 4282 .dev_attrs = st_dev_attrs, 4283 }; 4284 4285 static int __init init_st(void) 4286 { 4287 int err; 4288 4289 validate_options(); 4290 4291 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4292 verstr, st_fixed_buffer_size, st_max_sg_segs); 4293 4294 err = class_register(&st_sysfs_class); 4295 if (err) { 4296 pr_err("Unable register sysfs class for SCSI tapes\n"); 4297 return err; 4298 } 4299 4300 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4301 ST_MAX_TAPE_ENTRIES, "st"); 4302 if (err) { 4303 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4304 SCSI_TAPE_MAJOR); 4305 goto err_class; 4306 } 4307 4308 err = scsi_register_driver(&st_template.gendrv); 4309 if (err) 4310 goto err_chrdev; 4311 4312 err = do_create_sysfs_files(); 4313 if (err) 4314 goto err_scsidrv; 4315 4316 return 0; 4317 4318 err_scsidrv: 4319 scsi_unregister_driver(&st_template.gendrv); 4320 err_chrdev: 4321 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4322 ST_MAX_TAPE_ENTRIES); 4323 err_class: 4324 class_unregister(&st_sysfs_class); 4325 return err; 4326 } 4327 4328 static void __exit exit_st(void) 4329 { 4330 do_remove_sysfs_files(); 4331 scsi_unregister_driver(&st_template.gendrv); 4332 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4333 ST_MAX_TAPE_ENTRIES); 4334 class_unregister(&st_sysfs_class); 4335 printk(KERN_INFO "st: Unloaded.\n"); 4336 } 4337 4338 module_init(init_st); 4339 module_exit(exit_st); 4340 4341 4342 /* The sysfs driver interface. Read-only at the moment */ 4343 static ssize_t st_try_direct_io_show(struct device_driver *ddp, char *buf) 4344 { 4345 return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4346 } 4347 static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); 4348 4349 static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4350 { 4351 return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4352 } 4353 static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); 4354 4355 static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) 4356 { 4357 return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4358 } 4359 static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); 4360 4361 static ssize_t st_version_show(struct device_driver *ddd, char *buf) 4362 { 4363 return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4364 } 4365 static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); 4366 4367 static int do_create_sysfs_files(void) 4368 { 4369 struct device_driver *sysfs = &st_template.gendrv; 4370 int err; 4371 4372 err = driver_create_file(sysfs, &driver_attr_try_direct_io); 4373 if (err) 4374 return err; 4375 err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); 4376 if (err) 4377 goto err_try_direct_io; 4378 err = driver_create_file(sysfs, &driver_attr_max_sg_segs); 4379 if (err) 4380 goto err_attr_fixed_buf; 4381 err = driver_create_file(sysfs, &driver_attr_version); 4382 if (err) 4383 goto err_attr_max_sg; 4384 4385 return 0; 4386 4387 err_attr_max_sg: 4388 driver_remove_file(sysfs, &driver_attr_max_sg_segs); 4389 err_attr_fixed_buf: 4390 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); 4391 err_try_direct_io: 4392 driver_remove_file(sysfs, &driver_attr_try_direct_io); 4393 return err; 4394 } 4395 4396 static void do_remove_sysfs_files(void) 4397 { 4398 struct device_driver *sysfs = &st_template.gendrv; 4399 4400 driver_remove_file(sysfs, &driver_attr_version); 4401 driver_remove_file(sysfs, &driver_attr_max_sg_segs); 4402 driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); 4403 driver_remove_file(sysfs, &driver_attr_try_direct_io); 4404 } 4405 4406 /* The sysfs simple class interface */ 4407 static ssize_t 4408 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4409 { 4410 struct st_modedef *STm = dev_get_drvdata(dev); 4411 ssize_t l = 0; 4412 4413 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4414 return l; 4415 } 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 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 4442 static ssize_t 4443 default_compression_show(struct device *dev, struct device_attribute *attr, 4444 char *buf) 4445 { 4446 struct st_modedef *STm = dev_get_drvdata(dev); 4447 ssize_t l = 0; 4448 4449 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4450 return l; 4451 } 4452 4453 static ssize_t 4454 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4455 { 4456 struct st_modedef *STm = dev_get_drvdata(dev); 4457 struct scsi_tape *STp = STm->tape; 4458 int options; 4459 ssize_t l = 0; 4460 4461 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4462 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4463 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4464 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4465 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4466 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4467 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4468 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4469 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4470 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4471 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4472 options |= STm->sysv ? MT_ST_SYSV : 0; 4473 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4474 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4475 options |= STp->sili ? MT_ST_SILI : 0; 4476 4477 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4478 return l; 4479 } 4480 4481 static struct device_attribute st_dev_attrs[] = { 4482 __ATTR_RO(defined), 4483 __ATTR_RO(default_blksize), 4484 __ATTR_RO(default_density), 4485 __ATTR_RO(default_compression), 4486 __ATTR_RO(options), 4487 __ATTR_NULL, 4488 }; 4489 4490 /* The following functions may be useful for a larger audience. */ 4491 static int sgl_map_user_pages(struct st_buffer *STbp, 4492 const unsigned int max_pages, unsigned long uaddr, 4493 size_t count, int rw) 4494 { 4495 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4496 unsigned long start = uaddr >> PAGE_SHIFT; 4497 const int nr_pages = end - start; 4498 int res, i, j; 4499 struct page **pages; 4500 struct rq_map_data *mdata = &STbp->map_data; 4501 4502 /* User attempted Overflow! */ 4503 if ((uaddr + count) < uaddr) 4504 return -EINVAL; 4505 4506 /* Too big */ 4507 if (nr_pages > max_pages) 4508 return -ENOMEM; 4509 4510 /* Hmm? */ 4511 if (count == 0) 4512 return 0; 4513 4514 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) 4515 return -ENOMEM; 4516 4517 /* Try to fault in all of the necessary pages */ 4518 down_read(¤t->mm->mmap_sem); 4519 /* rw==READ means read from drive, write into memory area */ 4520 res = get_user_pages( 4521 current, 4522 current->mm, 4523 uaddr, 4524 nr_pages, 4525 rw == READ, 4526 0, /* don't force */ 4527 pages, 4528 NULL); 4529 up_read(¤t->mm->mmap_sem); 4530 4531 /* Errors and no page mapped should return here */ 4532 if (res < nr_pages) 4533 goto out_unmap; 4534 4535 for (i=0; i < nr_pages; i++) { 4536 /* FIXME: flush superflous for rw==READ, 4537 * probably wrong function for rw==WRITE 4538 */ 4539 flush_dcache_page(pages[i]); 4540 } 4541 4542 mdata->offset = uaddr & ~PAGE_MASK; 4543 STbp->mapped_pages = pages; 4544 4545 return nr_pages; 4546 out_unmap: 4547 if (res > 0) { 4548 for (j=0; j < res; j++) 4549 page_cache_release(pages[j]); 4550 res = 0; 4551 } 4552 kfree(pages); 4553 return res; 4554 } 4555 4556 4557 /* And unmap them... */ 4558 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4559 const unsigned int nr_pages, int dirtied) 4560 { 4561 int i; 4562 4563 for (i=0; i < nr_pages; i++) { 4564 struct page *page = STbp->mapped_pages[i]; 4565 4566 if (dirtied) 4567 SetPageDirty(page); 4568 /* FIXME: cache flush missing for rw==READ 4569 * FIXME: call the correct reference counting function 4570 */ 4571 page_cache_release(page); 4572 } 4573 kfree(STbp->mapped_pages); 4574 STbp->mapped_pages = NULL; 4575 4576 return 0; 4577 } 4578