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 1 60 #define NO_DEBUG 0 61 62 #define ST_DEB_MSG KERN_NOTICE 63 #if DEBUG 64 /* The message level for the debug messages is currently set to KERN_NOTICE 65 so that people can easily see the messages. Later when the debugging messages 66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 67 #define DEB(a) a 68 #define DEBC(a) if (debugging) { a ; } 69 #else 70 #define DEB(a) 71 #define DEBC(a) 72 #endif 73 74 #define ST_KILOBYTE 1024 75 76 #include "st_options.h" 77 #include "st.h" 78 79 static int buffer_kbs; 80 static int max_sg_segs; 81 static int try_direct_io = TRY_DIRECT_IO; 82 static int try_rdio = 1; 83 static int try_wdio = 1; 84 static int debug_flag; 85 86 static struct class st_sysfs_class; 87 static const struct attribute_group *st_dev_groups[]; 88 static const struct attribute_group *st_drv_groups[]; 89 90 MODULE_AUTHOR("Kai Makisara"); 91 MODULE_DESCRIPTION("SCSI tape (st) driver"); 92 MODULE_LICENSE("GPL"); 93 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 94 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 95 96 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 97 * of sysfs parameters (which module_param doesn't yet support). 98 * Sysfs parameters defined explicitly later. 99 */ 100 module_param_named(buffer_kbs, buffer_kbs, int, 0); 101 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 102 module_param_named(max_sg_segs, max_sg_segs, int, 0); 103 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 104 module_param_named(try_direct_io, try_direct_io, int, 0); 105 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 106 module_param_named(debug_flag, debug_flag, int, 0); 107 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 108 109 110 /* Extra parameters for testing */ 111 module_param_named(try_rdio, try_rdio, int, 0); 112 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 113 module_param_named(try_wdio, try_wdio, int, 0); 114 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 115 116 #ifndef MODULE 117 static int write_threshold_kbs; /* retained for compatibility */ 118 static struct st_dev_parm { 119 char *name; 120 int *val; 121 } parms[] __initdata = { 122 { 123 "buffer_kbs", &buffer_kbs 124 }, 125 { /* Retained for compatibility with 2.4 */ 126 "write_threshold_kbs", &write_threshold_kbs 127 }, 128 { 129 "max_sg_segs", NULL 130 }, 131 { 132 "try_direct_io", &try_direct_io 133 }, 134 { 135 "debug_flag", &debug_flag 136 } 137 }; 138 #endif 139 140 /* Restrict the number of modes so that names for all are assigned */ 141 #if ST_NBR_MODES > 16 142 #error "Maximum number of modes is 16" 143 #endif 144 /* Bit reversed order to get same names for same minors with all 145 mode counts */ 146 static const char *st_formats[] = { 147 "", "r", "k", "s", "l", "t", "o", "u", 148 "m", "v", "p", "x", "a", "y", "q", "z"}; 149 150 /* The default definitions have been moved to st_options.h */ 151 152 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 153 154 /* The buffer size should fit into the 24 bits for length in the 155 6-byte SCSI read and write commands. */ 156 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 157 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 158 #endif 159 160 static int debugging = DEBUG; 161 162 #define MAX_RETRIES 0 163 #define MAX_WRITE_RETRIES 0 164 #define MAX_READY_RETRIES 0 165 #define NO_TAPE NOT_READY 166 167 #define ST_TIMEOUT (900 * HZ) 168 #define ST_LONG_TIMEOUT (14000 * HZ) 169 170 /* Remove mode bits and auto-rewind bit (7) */ 171 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) 173 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 174 175 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 176 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 178 179 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 180 24 bits) */ 181 #define SET_DENS_AND_BLK 0x10001 182 183 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 184 static int st_max_sg_segs = ST_MAX_SG; 185 186 static int modes_defined; 187 188 static int enlarge_buffer(struct st_buffer *, int, int); 189 static void clear_buffer(struct st_buffer *); 190 static void normalize_buffer(struct st_buffer *); 191 static int append_to_buffer(const char __user *, struct st_buffer *, int); 192 static int from_buffer(struct st_buffer *, char __user *, int); 193 static void move_buffer_data(struct st_buffer *, int); 194 195 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 196 unsigned long, size_t, int); 197 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 198 199 static int st_probe(struct device *); 200 static int st_remove(struct device *); 201 202 static struct scsi_driver st_template = { 203 .gendrv = { 204 .name = "st", 205 .owner = THIS_MODULE, 206 .probe = st_probe, 207 .remove = st_remove, 208 .groups = st_drv_groups, 209 }, 210 }; 211 212 static int st_compression(struct scsi_tape *, int); 213 214 static int find_partition(struct scsi_tape *); 215 static int switch_partition(struct scsi_tape *); 216 217 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 218 219 static void scsi_tape_release(struct kref *); 220 221 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 222 223 static DEFINE_MUTEX(st_ref_mutex); 224 static DEFINE_SPINLOCK(st_index_lock); 225 static DEFINE_SPINLOCK(st_use_lock); 226 static DEFINE_IDR(st_index_idr); 227 228 229 230 #include "osst_detect.h" 231 #ifndef SIGS_FROM_OSST 232 #define SIGS_FROM_OSST \ 233 {"OnStream", "SC-", "", "osst"}, \ 234 {"OnStream", "DI-", "", "osst"}, \ 235 {"OnStream", "DP-", "", "osst"}, \ 236 {"OnStream", "USB", "", "osst"}, \ 237 {"OnStream", "FW-", "", "osst"} 238 #endif 239 240 static struct scsi_tape *scsi_tape_get(int dev) 241 { 242 struct scsi_tape *STp = NULL; 243 244 mutex_lock(&st_ref_mutex); 245 spin_lock(&st_index_lock); 246 247 STp = idr_find(&st_index_idr, dev); 248 if (!STp) goto out; 249 250 kref_get(&STp->kref); 251 252 if (!STp->device) 253 goto out_put; 254 255 if (scsi_device_get(STp->device)) 256 goto out_put; 257 258 goto out; 259 260 out_put: 261 kref_put(&STp->kref, scsi_tape_release); 262 STp = NULL; 263 out: 264 spin_unlock(&st_index_lock); 265 mutex_unlock(&st_ref_mutex); 266 return STp; 267 } 268 269 static void scsi_tape_put(struct scsi_tape *STp) 270 { 271 struct scsi_device *sdev = STp->device; 272 273 mutex_lock(&st_ref_mutex); 274 kref_put(&STp->kref, scsi_tape_release); 275 scsi_device_put(sdev); 276 mutex_unlock(&st_ref_mutex); 277 } 278 279 struct st_reject_data { 280 char *vendor; 281 char *model; 282 char *rev; 283 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 284 }; 285 286 static struct st_reject_data reject_list[] = { 287 /* {"XXX", "Yy-", "", NULL}, example */ 288 SIGS_FROM_OSST, 289 {NULL, }}; 290 291 /* If the device signature is on the list of incompatible drives, the 292 function returns a pointer to the name of the correct driver (if known) */ 293 static char * st_incompatible(struct scsi_device* SDp) 294 { 295 struct st_reject_data *rp; 296 297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 299 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 301 if (rp->driver_hint) 302 return rp->driver_hint; 303 else 304 return "unknown"; 305 } 306 return NULL; 307 } 308 309 310 static inline char *tape_name(struct scsi_tape *tape) 311 { 312 return tape->disk->disk_name; 313 } 314 315 #define st_printk(prefix, t, fmt, a...) \ 316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) 317 #ifdef DEBUG 318 #define DEBC_printk(t, fmt, a...) \ 319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 320 #else 321 #define DEBC_printk(t, fmt, a...) 322 #endif 323 324 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 325 { 326 const u8 *ucp; 327 const u8 *sense = SRpnt->sense; 328 329 s->have_sense = scsi_normalize_sense(SRpnt->sense, 330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 331 s->flags = 0; 332 333 if (s->have_sense) { 334 s->deferred = 0; 335 s->remainder_valid = 336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 337 switch (sense[0] & 0x7f) { 338 case 0x71: 339 s->deferred = 1; 340 case 0x70: 341 s->fixed_format = 1; 342 s->flags = sense[2] & 0xe0; 343 break; 344 case 0x73: 345 s->deferred = 1; 346 case 0x72: 347 s->fixed_format = 0; 348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 349 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 350 break; 351 } 352 } 353 } 354 355 356 /* Convert the result to success code */ 357 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 358 { 359 int result = SRpnt->result; 360 u8 scode; 361 DEB(const char *stp;) 362 char *name = tape_name(STp); 363 struct st_cmdstatus *cmdstatp; 364 365 if (!result) 366 return 0; 367 368 cmdstatp = &STp->buffer->cmdstat; 369 st_analyze_sense(SRpnt, cmdstatp); 370 371 if (cmdstatp->have_sense) 372 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 373 else 374 scode = 0; 375 376 DEB( 377 if (debugging) { 378 st_printk(ST_DEB_MSG, STp, 379 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 382 if (cmdstatp->have_sense) 383 __scsi_print_sense(STp->device, name, 384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 385 } ) /* end DEB */ 386 if (!debugging) { /* Abnormal conditions for tape */ 387 if (!cmdstatp->have_sense) 388 st_printk(KERN_WARNING, STp, 389 "Error %x (driver bt 0x%x, host bt 0x%x).\n", 390 result, driver_byte(result), host_byte(result)); 391 else if (cmdstatp->have_sense && 392 scode != NO_SENSE && 393 scode != RECOVERED_ERROR && 394 /* scode != UNIT_ATTENTION && */ 395 scode != BLANK_CHECK && 396 scode != VOLUME_OVERFLOW && 397 SRpnt->cmd[0] != MODE_SENSE && 398 SRpnt->cmd[0] != TEST_UNIT_READY) { 399 400 __scsi_print_sense(STp->device, name, 401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 402 } 403 } 404 405 if (cmdstatp->fixed_format && 406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 407 if (STp->cln_sense_value) 408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 409 STp->cln_sense_mask) == STp->cln_sense_value); 410 else 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 412 STp->cln_sense_mask) != 0); 413 } 414 if (cmdstatp->have_sense && 415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 417 418 STp->pos_unknown |= STp->device->was_reset; 419 420 if (cmdstatp->have_sense && 421 scode == RECOVERED_ERROR 422 #if ST_RECOVERED_WRITE_FATAL 423 && SRpnt->cmd[0] != WRITE_6 424 && SRpnt->cmd[0] != WRITE_FILEMARKS 425 #endif 426 ) { 427 STp->recover_count++; 428 STp->recover_reg++; 429 430 DEB( 431 if (debugging) { 432 if (SRpnt->cmd[0] == READ_6) 433 stp = "read"; 434 else if (SRpnt->cmd[0] == WRITE_6) 435 stp = "write"; 436 else 437 stp = "ioctl"; 438 st_printk(ST_DEB_MSG, STp, 439 "Recovered %s error (%d).\n", 440 stp, STp->recover_count); 441 } ) /* end DEB */ 442 443 if (cmdstatp->flags == 0) 444 return 0; 445 } 446 return (-EIO); 447 } 448 449 static struct st_request *st_allocate_request(struct scsi_tape *stp) 450 { 451 struct st_request *streq; 452 453 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 454 if (streq) 455 streq->stp = stp; 456 else { 457 st_printk(KERN_ERR, stp, 458 "Can't get SCSI request.\n"); 459 if (signal_pending(current)) 460 stp->buffer->syscall_result = -EINTR; 461 else 462 stp->buffer->syscall_result = -EBUSY; 463 } 464 465 return streq; 466 } 467 468 static void st_release_request(struct st_request *streq) 469 { 470 kfree(streq); 471 } 472 473 static void st_do_stats(struct scsi_tape *STp, struct request *req) 474 { 475 ktime_t now; 476 477 now = ktime_get(); 478 if (req->cmd[0] == WRITE_6) { 479 now = ktime_sub(now, STp->stats->write_time); 480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 482 atomic64_inc(&STp->stats->write_cnt); 483 if (req->errors) { 484 atomic64_add(atomic_read(&STp->stats->last_write_size) 485 - STp->buffer->cmdstat.residual, 486 &STp->stats->write_byte_cnt); 487 if (STp->buffer->cmdstat.residual > 0) 488 atomic64_inc(&STp->stats->resid_cnt); 489 } else 490 atomic64_add(atomic_read(&STp->stats->last_write_size), 491 &STp->stats->write_byte_cnt); 492 } else if (req->cmd[0] == READ_6) { 493 now = ktime_sub(now, STp->stats->read_time); 494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 496 atomic64_inc(&STp->stats->read_cnt); 497 if (req->errors) { 498 atomic64_add(atomic_read(&STp->stats->last_read_size) 499 - STp->buffer->cmdstat.residual, 500 &STp->stats->read_byte_cnt); 501 if (STp->buffer->cmdstat.residual > 0) 502 atomic64_inc(&STp->stats->resid_cnt); 503 } else 504 atomic64_add(atomic_read(&STp->stats->last_read_size), 505 &STp->stats->read_byte_cnt); 506 } else { 507 now = ktime_sub(now, STp->stats->other_time); 508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 509 atomic64_inc(&STp->stats->other_cnt); 510 } 511 atomic64_dec(&STp->stats->in_flight); 512 } 513 514 static void st_scsi_execute_end(struct request *req, int uptodate) 515 { 516 struct st_request *SRpnt = req->end_io_data; 517 struct scsi_tape *STp = SRpnt->stp; 518 struct bio *tmp; 519 520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; 521 STp->buffer->cmdstat.residual = req->resid_len; 522 523 st_do_stats(STp, req); 524 525 tmp = SRpnt->bio; 526 if (SRpnt->waiting) 527 complete(SRpnt->waiting); 528 529 blk_rq_unmap_user(tmp); 530 __blk_put_request(req->q, req); 531 } 532 533 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 534 int data_direction, void *buffer, unsigned bufflen, 535 int timeout, int retries) 536 { 537 struct request *req; 538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 539 int err = 0; 540 int write = (data_direction == DMA_TO_DEVICE); 541 struct scsi_tape *STp = SRpnt->stp; 542 543 req = blk_get_request(SRpnt->stp->device->request_queue, write, 544 GFP_KERNEL); 545 if (IS_ERR(req)) 546 return DRIVER_ERROR << 24; 547 548 blk_rq_set_block_pc(req); 549 req->cmd_flags |= REQ_QUIET; 550 551 mdata->null_mapped = 1; 552 553 if (bufflen) { 554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 555 GFP_KERNEL); 556 if (err) { 557 blk_put_request(req); 558 return DRIVER_ERROR << 24; 559 } 560 } 561 562 atomic64_inc(&STp->stats->in_flight); 563 if (cmd[0] == WRITE_6) { 564 atomic_set(&STp->stats->last_write_size, bufflen); 565 STp->stats->write_time = ktime_get(); 566 } else if (cmd[0] == READ_6) { 567 atomic_set(&STp->stats->last_read_size, bufflen); 568 STp->stats->read_time = ktime_get(); 569 } else { 570 STp->stats->other_time = ktime_get(); 571 } 572 573 SRpnt->bio = req->bio; 574 req->cmd_len = COMMAND_SIZE(cmd[0]); 575 memset(req->cmd, 0, BLK_MAX_CDB); 576 memcpy(req->cmd, cmd, req->cmd_len); 577 req->sense = SRpnt->sense; 578 req->sense_len = 0; 579 req->timeout = timeout; 580 req->retries = retries; 581 req->end_io_data = SRpnt; 582 583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); 584 return 0; 585 } 586 587 /* Do the scsi command. Waits until command performed if do_wait is true. 588 Otherwise write_behind_check() is used to check that the command 589 has finished. */ 590 static struct st_request * 591 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 592 int bytes, int direction, int timeout, int retries, int do_wait) 593 { 594 struct completion *waiting; 595 struct rq_map_data *mdata = &STp->buffer->map_data; 596 int ret; 597 598 /* if async, make sure there's no command outstanding */ 599 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 600 st_printk(KERN_ERR, STp, 601 "Async command already active.\n"); 602 if (signal_pending(current)) 603 (STp->buffer)->syscall_result = (-EINTR); 604 else 605 (STp->buffer)->syscall_result = (-EBUSY); 606 return NULL; 607 } 608 609 if (!SRpnt) { 610 SRpnt = st_allocate_request(STp); 611 if (!SRpnt) 612 return NULL; 613 } 614 615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 616 which IO is outstanding. It's nulled out when the IO completes. */ 617 if (!do_wait) 618 (STp->buffer)->last_SRpnt = SRpnt; 619 620 waiting = &STp->wait; 621 init_completion(waiting); 622 SRpnt->waiting = waiting; 623 624 if (STp->buffer->do_dio) { 625 mdata->page_order = 0; 626 mdata->nr_entries = STp->buffer->sg_segs; 627 mdata->pages = STp->buffer->mapped_pages; 628 } else { 629 mdata->page_order = STp->buffer->reserved_page_order; 630 mdata->nr_entries = 631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 632 mdata->pages = STp->buffer->reserved_pages; 633 mdata->offset = 0; 634 } 635 636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 637 STp->buffer->cmdstat.have_sense = 0; 638 STp->buffer->syscall_result = 0; 639 640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 641 retries); 642 if (ret) { 643 /* could not allocate the buffer or request was too large */ 644 (STp->buffer)->syscall_result = (-EBUSY); 645 (STp->buffer)->last_SRpnt = NULL; 646 } else if (do_wait) { 647 wait_for_completion(waiting); 648 SRpnt->waiting = NULL; 649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 650 } 651 652 return SRpnt; 653 } 654 655 656 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 657 write has been correct but EOM early warning reached, -EIO if write ended in 658 error or zero if write successful. Asynchronous writes are used only in 659 variable block mode. */ 660 static int write_behind_check(struct scsi_tape * STp) 661 { 662 int retval = 0; 663 struct st_buffer *STbuffer; 664 struct st_partstat *STps; 665 struct st_cmdstatus *cmdstatp; 666 struct st_request *SRpnt; 667 668 STbuffer = STp->buffer; 669 if (!STbuffer->writing) 670 return 0; 671 672 DEB( 673 if (STp->write_pending) 674 STp->nbr_waits++; 675 else 676 STp->nbr_finished++; 677 ) /* end DEB */ 678 679 wait_for_completion(&(STp->wait)); 680 SRpnt = STbuffer->last_SRpnt; 681 STbuffer->last_SRpnt = NULL; 682 SRpnt->waiting = NULL; 683 684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 685 st_release_request(SRpnt); 686 687 STbuffer->buffer_bytes -= STbuffer->writing; 688 STps = &(STp->ps[STp->partition]); 689 if (STps->drv_block >= 0) { 690 if (STp->block_size == 0) 691 STps->drv_block++; 692 else 693 STps->drv_block += STbuffer->writing / STp->block_size; 694 } 695 696 cmdstatp = &STbuffer->cmdstat; 697 if (STbuffer->syscall_result) { 698 retval = -EIO; 699 if (cmdstatp->have_sense && !cmdstatp->deferred && 700 (cmdstatp->flags & SENSE_EOM) && 701 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 703 /* EOM at write-behind, has all data been written? */ 704 if (!cmdstatp->remainder_valid || 705 cmdstatp->uremainder64 == 0) 706 retval = -ENOSPC; 707 } 708 if (retval == -EIO) 709 STps->drv_block = -1; 710 } 711 STbuffer->writing = 0; 712 713 DEB(if (debugging && retval) 714 st_printk(ST_DEB_MSG, STp, 715 "Async write error %x, return value %d.\n", 716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 717 718 return retval; 719 } 720 721 722 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 723 it messes up the block number). */ 724 static int cross_eof(struct scsi_tape * STp, int forward) 725 { 726 struct st_request *SRpnt; 727 unsigned char cmd[MAX_COMMAND_SIZE]; 728 729 cmd[0] = SPACE; 730 cmd[1] = 0x01; /* Space FileMarks */ 731 if (forward) { 732 cmd[2] = cmd[3] = 0; 733 cmd[4] = 1; 734 } else 735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 736 cmd[5] = 0; 737 738 DEBC_printk(STp, "Stepping over filemark %s.\n", 739 forward ? "forward" : "backward"); 740 741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 742 STp->device->request_queue->rq_timeout, 743 MAX_RETRIES, 1); 744 if (!SRpnt) 745 return (STp->buffer)->syscall_result; 746 747 st_release_request(SRpnt); 748 SRpnt = NULL; 749 750 if ((STp->buffer)->cmdstat.midlevel_result != 0) 751 st_printk(KERN_ERR, STp, 752 "Stepping over filemark %s failed.\n", 753 forward ? "forward" : "backward"); 754 755 return (STp->buffer)->syscall_result; 756 } 757 758 759 /* Flush the write buffer (never need to write if variable blocksize). */ 760 static int st_flush_write_buffer(struct scsi_tape * STp) 761 { 762 int transfer, blks; 763 int result; 764 unsigned char cmd[MAX_COMMAND_SIZE]; 765 struct st_request *SRpnt; 766 struct st_partstat *STps; 767 768 result = write_behind_check(STp); 769 if (result) 770 return result; 771 772 result = 0; 773 if (STp->dirty == 1) { 774 775 transfer = STp->buffer->buffer_bytes; 776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 777 778 memset(cmd, 0, MAX_COMMAND_SIZE); 779 cmd[0] = WRITE_6; 780 cmd[1] = 1; 781 blks = transfer / STp->block_size; 782 cmd[2] = blks >> 16; 783 cmd[3] = blks >> 8; 784 cmd[4] = blks; 785 786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 787 STp->device->request_queue->rq_timeout, 788 MAX_WRITE_RETRIES, 1); 789 if (!SRpnt) 790 return (STp->buffer)->syscall_result; 791 792 STps = &(STp->ps[STp->partition]); 793 if ((STp->buffer)->syscall_result != 0) { 794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 795 796 if (cmdstatp->have_sense && !cmdstatp->deferred && 797 (cmdstatp->flags & SENSE_EOM) && 798 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 800 (!cmdstatp->remainder_valid || 801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 802 STp->dirty = 0; 803 (STp->buffer)->buffer_bytes = 0; 804 if (STps->drv_block >= 0) 805 STps->drv_block += blks; 806 result = (-ENOSPC); 807 } else { 808 st_printk(KERN_ERR, STp, "Error on flush.\n"); 809 STps->drv_block = (-1); 810 result = (-EIO); 811 } 812 } else { 813 if (STps->drv_block >= 0) 814 STps->drv_block += blks; 815 STp->dirty = 0; 816 (STp->buffer)->buffer_bytes = 0; 817 } 818 st_release_request(SRpnt); 819 SRpnt = NULL; 820 } 821 return result; 822 } 823 824 825 /* Flush the tape buffer. The tape will be positioned correctly unless 826 seek_next is true. */ 827 static int flush_buffer(struct scsi_tape *STp, int seek_next) 828 { 829 int backspace, result; 830 struct st_buffer *STbuffer; 831 struct st_partstat *STps; 832 833 STbuffer = STp->buffer; 834 835 /* 836 * If there was a bus reset, block further access 837 * to this device. 838 */ 839 if (STp->pos_unknown) 840 return (-EIO); 841 842 if (STp->ready != ST_READY) 843 return 0; 844 STps = &(STp->ps[STp->partition]); 845 if (STps->rw == ST_WRITING) /* Writing */ 846 return st_flush_write_buffer(STp); 847 848 if (STp->block_size == 0) 849 return 0; 850 851 backspace = ((STp->buffer)->buffer_bytes + 852 (STp->buffer)->read_pointer) / STp->block_size - 853 ((STp->buffer)->read_pointer + STp->block_size - 1) / 854 STp->block_size; 855 (STp->buffer)->buffer_bytes = 0; 856 (STp->buffer)->read_pointer = 0; 857 result = 0; 858 if (!seek_next) { 859 if (STps->eof == ST_FM_HIT) { 860 result = cross_eof(STp, 0); /* Back over the EOF hit */ 861 if (!result) 862 STps->eof = ST_NOEOF; 863 else { 864 if (STps->drv_file >= 0) 865 STps->drv_file++; 866 STps->drv_block = 0; 867 } 868 } 869 if (!result && backspace > 0) 870 result = st_int_ioctl(STp, MTBSR, backspace); 871 } else if (STps->eof == ST_FM_HIT) { 872 if (STps->drv_file >= 0) 873 STps->drv_file++; 874 STps->drv_block = 0; 875 STps->eof = ST_NOEOF; 876 } 877 return result; 878 879 } 880 881 /* Set the mode parameters */ 882 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 883 { 884 int set_it = 0; 885 unsigned long arg; 886 887 if (!STp->density_changed && 888 STm->default_density >= 0 && 889 STm->default_density != STp->density) { 890 arg = STm->default_density; 891 set_it = 1; 892 } else 893 arg = STp->density; 894 arg <<= MT_ST_DENSITY_SHIFT; 895 if (!STp->blksize_changed && 896 STm->default_blksize >= 0 && 897 STm->default_blksize != STp->block_size) { 898 arg |= STm->default_blksize; 899 set_it = 1; 900 } else 901 arg |= STp->block_size; 902 if (set_it && 903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 904 st_printk(KERN_WARNING, STp, 905 "Can't set default block size to %d bytes " 906 "and density %x.\n", 907 STm->default_blksize, STm->default_density); 908 if (modes_defined) 909 return (-EINVAL); 910 } 911 return 0; 912 } 913 914 915 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 916 static int do_door_lock(struct scsi_tape * STp, int do_lock) 917 { 918 int retval; 919 920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 921 922 retval = scsi_set_medium_removal(STp->device, 923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 924 if (!retval) 925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 926 else 927 STp->door_locked = ST_LOCK_FAILS; 928 return retval; 929 } 930 931 932 /* Set the internal state after reset */ 933 static void reset_state(struct scsi_tape *STp) 934 { 935 int i; 936 struct st_partstat *STps; 937 938 STp->pos_unknown = 0; 939 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 940 STps = &(STp->ps[i]); 941 STps->rw = ST_IDLE; 942 STps->eof = ST_NOEOF; 943 STps->at_sm = 0; 944 STps->last_block_valid = 0; 945 STps->drv_block = -1; 946 STps->drv_file = -1; 947 } 948 if (STp->can_partitions) { 949 STp->partition = find_partition(STp); 950 if (STp->partition < 0) 951 STp->partition = 0; 952 STp->new_partition = STp->partition; 953 } 954 } 955 956 /* Test if the drive is ready. Returns either one of the codes below or a negative system 957 error code. */ 958 #define CHKRES_READY 0 959 #define CHKRES_NEW_SESSION 1 960 #define CHKRES_NOT_READY 2 961 #define CHKRES_NO_TAPE 3 962 963 #define MAX_ATTENTIONS 10 964 965 static int test_ready(struct scsi_tape *STp, int do_wait) 966 { 967 int attentions, waits, max_wait, scode; 968 int retval = CHKRES_READY, new_session = 0; 969 unsigned char cmd[MAX_COMMAND_SIZE]; 970 struct st_request *SRpnt = NULL; 971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 972 973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 974 975 for (attentions=waits=0; ; ) { 976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 977 cmd[0] = TEST_UNIT_READY; 978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 979 STp->long_timeout, MAX_READY_RETRIES, 1); 980 981 if (!SRpnt) { 982 retval = (STp->buffer)->syscall_result; 983 break; 984 } 985 986 if (cmdstatp->have_sense) { 987 988 scode = cmdstatp->sense_hdr.sense_key; 989 990 if (scode == UNIT_ATTENTION) { /* New media? */ 991 new_session = 1; 992 if (attentions < MAX_ATTENTIONS) { 993 attentions++; 994 continue; 995 } 996 else { 997 retval = (-EIO); 998 break; 999 } 1000 } 1001 1002 if (scode == NOT_READY) { 1003 if (waits < max_wait) { 1004 if (msleep_interruptible(1000)) { 1005 retval = (-EINTR); 1006 break; 1007 } 1008 waits++; 1009 continue; 1010 } 1011 else { 1012 if ((STp->device)->scsi_level >= SCSI_2 && 1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1014 retval = CHKRES_NO_TAPE; 1015 else 1016 retval = CHKRES_NOT_READY; 1017 break; 1018 } 1019 } 1020 } 1021 1022 retval = (STp->buffer)->syscall_result; 1023 if (!retval) 1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1025 break; 1026 } 1027 1028 if (SRpnt != NULL) 1029 st_release_request(SRpnt); 1030 return retval; 1031 } 1032 1033 1034 /* See if the drive is ready and gather information about the tape. Return values: 1035 < 0 negative error code from errno.h 1036 0 drive ready 1037 1 drive not ready (possibly no tape) 1038 */ 1039 static int check_tape(struct scsi_tape *STp, struct file *filp) 1040 { 1041 int i, retval, new_session = 0, do_wait; 1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1043 unsigned short st_flags = filp->f_flags; 1044 struct st_request *SRpnt = NULL; 1045 struct st_modedef *STm; 1046 struct st_partstat *STps; 1047 struct inode *inode = file_inode(filp); 1048 int mode = TAPE_MODE(inode); 1049 1050 STp->ready = ST_READY; 1051 1052 if (mode != STp->current_mode) { 1053 DEBC_printk(STp, "Mode change from %d to %d.\n", 1054 STp->current_mode, mode); 1055 new_session = 1; 1056 STp->current_mode = mode; 1057 } 1058 STm = &(STp->modes[STp->current_mode]); 1059 1060 saved_cleaning = STp->cleaning_req; 1061 STp->cleaning_req = 0; 1062 1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1064 retval = test_ready(STp, do_wait); 1065 1066 if (retval < 0) 1067 goto err_out; 1068 1069 if (retval == CHKRES_NEW_SESSION) { 1070 STp->pos_unknown = 0; 1071 STp->partition = STp->new_partition = 0; 1072 if (STp->can_partitions) 1073 STp->nbr_partitions = 1; /* This guess will be updated later 1074 if necessary */ 1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1076 STps = &(STp->ps[i]); 1077 STps->rw = ST_IDLE; 1078 STps->eof = ST_NOEOF; 1079 STps->at_sm = 0; 1080 STps->last_block_valid = 0; 1081 STps->drv_block = 0; 1082 STps->drv_file = 0; 1083 } 1084 new_session = 1; 1085 } 1086 else { 1087 STp->cleaning_req |= saved_cleaning; 1088 1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1090 if (retval == CHKRES_NO_TAPE) 1091 STp->ready = ST_NO_TAPE; 1092 else 1093 STp->ready = ST_NOT_READY; 1094 1095 STp->density = 0; /* Clear the erroneous "residue" */ 1096 STp->write_prot = 0; 1097 STp->block_size = 0; 1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1099 STp->partition = STp->new_partition = 0; 1100 STp->door_locked = ST_UNLOCKED; 1101 return CHKRES_NOT_READY; 1102 } 1103 } 1104 1105 if (STp->omit_blklims) 1106 STp->min_block = STp->max_block = (-1); 1107 else { 1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1109 cmd[0] = READ_BLOCK_LIMITS; 1110 1111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1112 STp->device->request_queue->rq_timeout, 1113 MAX_READY_RETRIES, 1); 1114 if (!SRpnt) { 1115 retval = (STp->buffer)->syscall_result; 1116 goto err_out; 1117 } 1118 1119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1120 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1123 (STp->buffer)->b_data[5]; 1124 if ( DEB( debugging || ) !STp->inited) 1125 st_printk(KERN_INFO, STp, 1126 "Block limits %d - %d bytes.\n", 1127 STp->min_block, STp->max_block); 1128 } else { 1129 STp->min_block = STp->max_block = (-1); 1130 DEBC_printk(STp, "Can't read block limits.\n"); 1131 } 1132 } 1133 1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1135 cmd[0] = MODE_SENSE; 1136 cmd[4] = 12; 1137 1138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1139 STp->device->request_queue->rq_timeout, 1140 MAX_READY_RETRIES, 1); 1141 if (!SRpnt) { 1142 retval = (STp->buffer)->syscall_result; 1143 goto err_out; 1144 } 1145 1146 if ((STp->buffer)->syscall_result != 0) { 1147 DEBC_printk(STp, "No Mode Sense.\n"); 1148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1150 STp->drv_write_prot = 0; 1151 } else { 1152 DEBC_printk(STp,"Mode sense. Length %d, " 1153 "medium %x, WBS %x, BLL %d\n", 1154 (STp->buffer)->b_data[0], 1155 (STp->buffer)->b_data[1], 1156 (STp->buffer)->b_data[2], 1157 (STp->buffer)->b_data[3]); 1158 1159 if ((STp->buffer)->b_data[3] >= 8) { 1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1161 STp->density = (STp->buffer)->b_data[4]; 1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1164 DEBC_printk(STp, "Density %x, tape length: %x, " 1165 "drv buffer: %d\n", 1166 STp->density, 1167 (STp->buffer)->b_data[5] * 65536 + 1168 (STp->buffer)->b_data[6] * 256 + 1169 (STp->buffer)->b_data[7], 1170 STp->drv_buffer); 1171 } 1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1173 if (!STp->drv_buffer && STp->immediate_filemark) { 1174 st_printk(KERN_WARNING, STp, 1175 "non-buffered tape: disabling " 1176 "writing immediate filemarks\n"); 1177 STp->immediate_filemark = 0; 1178 } 1179 } 1180 st_release_request(SRpnt); 1181 SRpnt = NULL; 1182 STp->inited = 1; 1183 1184 if (STp->block_size > 0) 1185 (STp->buffer)->buffer_blocks = 1186 (STp->buffer)->buffer_size / STp->block_size; 1187 else 1188 (STp->buffer)->buffer_blocks = 1; 1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1190 1191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1192 STp->block_size, (STp->buffer)->buffer_size, 1193 (STp->buffer)->buffer_blocks); 1194 1195 if (STp->drv_write_prot) { 1196 STp->write_prot = 1; 1197 1198 DEBC_printk(STp, "Write protected\n"); 1199 1200 if (do_wait && 1201 ((st_flags & O_ACCMODE) == O_WRONLY || 1202 (st_flags & O_ACCMODE) == O_RDWR)) { 1203 retval = (-EROFS); 1204 goto err_out; 1205 } 1206 } 1207 1208 if (STp->can_partitions && STp->nbr_partitions < 1) { 1209 /* This code is reached when the device is opened for the first time 1210 after the driver has been initialized with tape in the drive and the 1211 partition support has been enabled. */ 1212 DEBC_printk(STp, "Updating partition number in status.\n"); 1213 if ((STp->partition = find_partition(STp)) < 0) { 1214 retval = STp->partition; 1215 goto err_out; 1216 } 1217 STp->new_partition = STp->partition; 1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1219 } 1220 1221 if (new_session) { /* Change the drive parameters for the new mode */ 1222 STp->density_changed = STp->blksize_changed = 0; 1223 STp->compression_changed = 0; 1224 if (!(STm->defaults_for_writes) && 1225 (retval = set_mode_densblk(STp, STm)) < 0) 1226 goto err_out; 1227 1228 if (STp->default_drvbuffer != 0xff) { 1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1230 st_printk(KERN_WARNING, STp, 1231 "Can't set default drive " 1232 "buffering to %d.\n", 1233 STp->default_drvbuffer); 1234 } 1235 } 1236 1237 return CHKRES_READY; 1238 1239 err_out: 1240 return retval; 1241 } 1242 1243 1244 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1245 module count. */ 1246 static int st_open(struct inode *inode, struct file *filp) 1247 { 1248 int i, retval = (-EIO); 1249 int resumed = 0; 1250 struct scsi_tape *STp; 1251 struct st_partstat *STps; 1252 int dev = TAPE_NR(inode); 1253 1254 /* 1255 * We really want to do nonseekable_open(inode, filp); here, but some 1256 * versions of tar incorrectly call lseek on tapes and bail out if that 1257 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1258 */ 1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1260 1261 if (!(STp = scsi_tape_get(dev))) { 1262 return -ENXIO; 1263 } 1264 1265 filp->private_data = STp; 1266 1267 spin_lock(&st_use_lock); 1268 if (STp->in_use) { 1269 spin_unlock(&st_use_lock); 1270 scsi_tape_put(STp); 1271 DEBC_printk(STp, "Device already in use.\n"); 1272 return (-EBUSY); 1273 } 1274 1275 STp->in_use = 1; 1276 spin_unlock(&st_use_lock); 1277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1278 1279 if (scsi_autopm_get_device(STp->device) < 0) { 1280 retval = -EIO; 1281 goto err_out; 1282 } 1283 resumed = 1; 1284 if (!scsi_block_when_processing_errors(STp->device)) { 1285 retval = (-ENXIO); 1286 goto err_out; 1287 } 1288 1289 /* See that we have at least a one page buffer available */ 1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1291 st_printk(KERN_WARNING, STp, 1292 "Can't allocate one page tape buffer.\n"); 1293 retval = (-EOVERFLOW); 1294 goto err_out; 1295 } 1296 1297 (STp->buffer)->cleared = 0; 1298 (STp->buffer)->writing = 0; 1299 (STp->buffer)->syscall_result = 0; 1300 1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1302 1303 STp->dirty = 0; 1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1305 STps = &(STp->ps[i]); 1306 STps->rw = ST_IDLE; 1307 } 1308 STp->try_dio_now = STp->try_dio; 1309 STp->recover_count = 0; 1310 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1312 1313 retval = check_tape(STp, filp); 1314 if (retval < 0) 1315 goto err_out; 1316 if ((filp->f_flags & O_NONBLOCK) == 0 && 1317 retval != CHKRES_READY) { 1318 if (STp->ready == NO_TAPE) 1319 retval = (-ENOMEDIUM); 1320 else 1321 retval = (-EIO); 1322 goto err_out; 1323 } 1324 return 0; 1325 1326 err_out: 1327 normalize_buffer(STp->buffer); 1328 spin_lock(&st_use_lock); 1329 STp->in_use = 0; 1330 spin_unlock(&st_use_lock); 1331 if (resumed) 1332 scsi_autopm_put_device(STp->device); 1333 scsi_tape_put(STp); 1334 return retval; 1335 1336 } 1337 1338 1339 /* Flush the tape buffer before close */ 1340 static int st_flush(struct file *filp, fl_owner_t id) 1341 { 1342 int result = 0, result2; 1343 unsigned char cmd[MAX_COMMAND_SIZE]; 1344 struct st_request *SRpnt; 1345 struct scsi_tape *STp = filp->private_data; 1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1347 struct st_partstat *STps = &(STp->ps[STp->partition]); 1348 1349 if (file_count(filp) > 1) 1350 return 0; 1351 1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1353 result = st_flush_write_buffer(STp); 1354 if (result != 0 && result != (-ENOSPC)) 1355 goto out; 1356 } 1357 1358 if (STp->can_partitions && 1359 (result2 = switch_partition(STp)) < 0) { 1360 DEBC_printk(STp, "switch_partition at close failed.\n"); 1361 if (result == 0) 1362 result = result2; 1363 goto out; 1364 } 1365 1366 DEBC( if (STp->nbr_requests) 1367 st_printk(KERN_DEBUG, STp, 1368 "Number of r/w requests %d, dio used in %d, " 1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1370 STp->nbr_pages)); 1371 1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1374 1375 #if DEBUG 1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1377 STp->nbr_waits, STp->nbr_finished); 1378 #endif 1379 memset(cmd, 0, MAX_COMMAND_SIZE); 1380 cmd[0] = WRITE_FILEMARKS; 1381 if (STp->immediate_filemark) 1382 cmd[1] = 1; 1383 cmd[4] = 1 + STp->two_fm; 1384 1385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1386 STp->device->request_queue->rq_timeout, 1387 MAX_WRITE_RETRIES, 1); 1388 if (!SRpnt) { 1389 result = (STp->buffer)->syscall_result; 1390 goto out; 1391 } 1392 1393 if (STp->buffer->syscall_result == 0 || 1394 (cmdstatp->have_sense && !cmdstatp->deferred && 1395 (cmdstatp->flags & SENSE_EOM) && 1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1399 /* Write successful at EOM */ 1400 st_release_request(SRpnt); 1401 SRpnt = NULL; 1402 if (STps->drv_file >= 0) 1403 STps->drv_file++; 1404 STps->drv_block = 0; 1405 if (STp->two_fm) 1406 cross_eof(STp, 0); 1407 STps->eof = ST_FM; 1408 } 1409 else { /* Write error */ 1410 st_release_request(SRpnt); 1411 SRpnt = NULL; 1412 st_printk(KERN_ERR, STp, 1413 "Error on write filemark.\n"); 1414 if (result == 0) 1415 result = (-EIO); 1416 } 1417 1418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1419 } else if (!STp->rew_at_close) { 1420 STps = &(STp->ps[STp->partition]); 1421 if (!STm->sysv || STps->rw != ST_READING) { 1422 if (STp->can_bsr) 1423 result = flush_buffer(STp, 0); 1424 else if (STps->eof == ST_FM_HIT) { 1425 result = cross_eof(STp, 0); 1426 if (result) { 1427 if (STps->drv_file >= 0) 1428 STps->drv_file++; 1429 STps->drv_block = 0; 1430 STps->eof = ST_FM; 1431 } else 1432 STps->eof = ST_NOEOF; 1433 } 1434 } else if ((STps->eof == ST_NOEOF && 1435 !(result = cross_eof(STp, 1))) || 1436 STps->eof == ST_FM_HIT) { 1437 if (STps->drv_file >= 0) 1438 STps->drv_file++; 1439 STps->drv_block = 0; 1440 STps->eof = ST_FM; 1441 } 1442 } 1443 1444 out: 1445 if (STp->rew_at_close) { 1446 result2 = st_int_ioctl(STp, MTREW, 1); 1447 if (result == 0) 1448 result = result2; 1449 } 1450 return result; 1451 } 1452 1453 1454 /* Close the device and release it. BKL is not needed: this is the only thread 1455 accessing this tape. */ 1456 static int st_release(struct inode *inode, struct file *filp) 1457 { 1458 int result = 0; 1459 struct scsi_tape *STp = filp->private_data; 1460 1461 if (STp->door_locked == ST_LOCKED_AUTO) 1462 do_door_lock(STp, 0); 1463 1464 normalize_buffer(STp->buffer); 1465 spin_lock(&st_use_lock); 1466 STp->in_use = 0; 1467 spin_unlock(&st_use_lock); 1468 scsi_autopm_put_device(STp->device); 1469 scsi_tape_put(STp); 1470 1471 return result; 1472 } 1473 1474 /* The checks common to both reading and writing */ 1475 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1476 { 1477 ssize_t retval = 0; 1478 1479 /* 1480 * If we are in the middle of error recovery, don't let anyone 1481 * else try and use this device. Also, if error recovery fails, it 1482 * may try and take the device offline, in which case all further 1483 * access to the device is prohibited. 1484 */ 1485 if (!scsi_block_when_processing_errors(STp->device)) { 1486 retval = (-ENXIO); 1487 goto out; 1488 } 1489 1490 if (STp->ready != ST_READY) { 1491 if (STp->ready == ST_NO_TAPE) 1492 retval = (-ENOMEDIUM); 1493 else 1494 retval = (-EIO); 1495 goto out; 1496 } 1497 1498 if (! STp->modes[STp->current_mode].defined) { 1499 retval = (-ENXIO); 1500 goto out; 1501 } 1502 1503 1504 /* 1505 * If there was a bus reset, block further access 1506 * to this device. 1507 */ 1508 if (STp->pos_unknown) { 1509 retval = (-EIO); 1510 goto out; 1511 } 1512 1513 if (count == 0) 1514 goto out; 1515 1516 DEB( 1517 if (!STp->in_use) { 1518 st_printk(ST_DEB_MSG, STp, 1519 "Incorrect device.\n"); 1520 retval = (-EIO); 1521 goto out; 1522 } ) /* end DEB */ 1523 1524 if (STp->can_partitions && 1525 (retval = switch_partition(STp)) < 0) 1526 goto out; 1527 1528 if (STp->block_size == 0 && STp->max_block > 0 && 1529 (count < STp->min_block || count > STp->max_block)) { 1530 retval = (-EINVAL); 1531 goto out; 1532 } 1533 1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1535 !do_door_lock(STp, 1)) 1536 STp->door_locked = ST_LOCKED_AUTO; 1537 1538 out: 1539 return retval; 1540 } 1541 1542 1543 static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1544 size_t count, int is_read) 1545 { 1546 int i, bufsize, retval = 0; 1547 struct st_buffer *STbp = STp->buffer; 1548 1549 if (is_read) 1550 i = STp->try_dio_now && try_rdio; 1551 else 1552 i = STp->try_dio_now && try_wdio; 1553 1554 if (i && ((unsigned long)buf & queue_dma_alignment( 1555 STp->device->request_queue)) == 0) { 1556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1557 count, (is_read ? READ : WRITE)); 1558 if (i > 0) { 1559 STbp->do_dio = i; 1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1561 } 1562 else 1563 STbp->do_dio = 0; /* fall back to buffering with any error */ 1564 STbp->sg_segs = STbp->do_dio; 1565 DEB( 1566 if (STbp->do_dio) { 1567 STp->nbr_dio++; 1568 STp->nbr_pages += STbp->do_dio; 1569 } 1570 ) 1571 } else 1572 STbp->do_dio = 0; 1573 DEB( STp->nbr_requests++; ) 1574 1575 if (!STbp->do_dio) { 1576 if (STp->block_size) 1577 bufsize = STp->block_size > st_fixed_buffer_size ? 1578 STp->block_size : st_fixed_buffer_size; 1579 else { 1580 bufsize = count; 1581 /* Make sure that data from previous user is not leaked even if 1582 HBA does not return correct residual */ 1583 if (is_read && STp->sili && !STbp->cleared) 1584 clear_buffer(STbp); 1585 } 1586 1587 if (bufsize > STbp->buffer_size && 1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { 1589 st_printk(KERN_WARNING, STp, 1590 "Can't allocate %d byte tape buffer.\n", 1591 bufsize); 1592 retval = (-EOVERFLOW); 1593 goto out; 1594 } 1595 if (STp->block_size) 1596 STbp->buffer_blocks = bufsize / STp->block_size; 1597 } 1598 1599 out: 1600 return retval; 1601 } 1602 1603 1604 /* Can be called more than once after each setup_buffer() */ 1605 static void release_buffering(struct scsi_tape *STp, int is_read) 1606 { 1607 struct st_buffer *STbp; 1608 1609 STbp = STp->buffer; 1610 if (STbp->do_dio) { 1611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1612 STbp->do_dio = 0; 1613 STbp->sg_segs = 0; 1614 } 1615 } 1616 1617 1618 /* Write command */ 1619 static ssize_t 1620 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1621 { 1622 ssize_t total; 1623 ssize_t i, do_count, blks, transfer; 1624 ssize_t retval; 1625 int undone, retry_eot = 0, scode; 1626 int async_write; 1627 unsigned char cmd[MAX_COMMAND_SIZE]; 1628 const char __user *b_point; 1629 struct st_request *SRpnt = NULL; 1630 struct scsi_tape *STp = filp->private_data; 1631 struct st_modedef *STm; 1632 struct st_partstat *STps; 1633 struct st_buffer *STbp; 1634 1635 if (mutex_lock_interruptible(&STp->lock)) 1636 return -ERESTARTSYS; 1637 1638 retval = rw_checks(STp, filp, count); 1639 if (retval || count == 0) 1640 goto out; 1641 1642 /* Write must be integral number of blocks */ 1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1644 st_printk(KERN_WARNING, STp, 1645 "Write not multiple of tape block size.\n"); 1646 retval = (-EINVAL); 1647 goto out; 1648 } 1649 1650 STm = &(STp->modes[STp->current_mode]); 1651 STps = &(STp->ps[STp->partition]); 1652 1653 if (STp->write_prot) { 1654 retval = (-EACCES); 1655 goto out; 1656 } 1657 1658 1659 if (STps->rw == ST_READING) { 1660 retval = flush_buffer(STp, 0); 1661 if (retval) 1662 goto out; 1663 STps->rw = ST_WRITING; 1664 } else if (STps->rw != ST_WRITING && 1665 STps->drv_file == 0 && STps->drv_block == 0) { 1666 if ((retval = set_mode_densblk(STp, STm)) < 0) 1667 goto out; 1668 if (STm->default_compression != ST_DONT_TOUCH && 1669 !(STp->compression_changed)) { 1670 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1671 st_printk(KERN_WARNING, STp, 1672 "Can't set default compression.\n"); 1673 if (modes_defined) { 1674 retval = (-EINVAL); 1675 goto out; 1676 } 1677 } 1678 } 1679 } 1680 1681 STbp = STp->buffer; 1682 i = write_behind_check(STp); 1683 if (i) { 1684 if (i == -ENOSPC) 1685 STps->eof = ST_EOM_OK; 1686 else 1687 STps->eof = ST_EOM_ERROR; 1688 } 1689 1690 if (STps->eof == ST_EOM_OK) { 1691 STps->eof = ST_EOD_1; /* allow next write */ 1692 retval = (-ENOSPC); 1693 goto out; 1694 } 1695 else if (STps->eof == ST_EOM_ERROR) { 1696 retval = (-EIO); 1697 goto out; 1698 } 1699 1700 /* Check the buffer readability in cases where copy_user might catch 1701 the problems after some tape movement. */ 1702 if (STp->block_size != 0 && 1703 !STbp->do_dio && 1704 (copy_from_user(&i, buf, 1) != 0 || 1705 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1706 retval = (-EFAULT); 1707 goto out; 1708 } 1709 1710 retval = setup_buffering(STp, buf, count, 0); 1711 if (retval) 1712 goto out; 1713 1714 total = count; 1715 1716 memset(cmd, 0, MAX_COMMAND_SIZE); 1717 cmd[0] = WRITE_6; 1718 cmd[1] = (STp->block_size != 0); 1719 1720 STps->rw = ST_WRITING; 1721 1722 b_point = buf; 1723 while (count > 0 && !retry_eot) { 1724 1725 if (STbp->do_dio) { 1726 do_count = count; 1727 } 1728 else { 1729 if (STp->block_size == 0) 1730 do_count = count; 1731 else { 1732 do_count = STbp->buffer_blocks * STp->block_size - 1733 STbp->buffer_bytes; 1734 if (do_count > count) 1735 do_count = count; 1736 } 1737 1738 i = append_to_buffer(b_point, STbp, do_count); 1739 if (i) { 1740 retval = i; 1741 goto out; 1742 } 1743 } 1744 count -= do_count; 1745 b_point += do_count; 1746 1747 async_write = STp->block_size == 0 && !STbp->do_dio && 1748 STm->do_async_writes && STps->eof < ST_EOM_OK; 1749 1750 if (STp->block_size != 0 && STm->do_buffer_writes && 1751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1752 STbp->buffer_bytes < STbp->buffer_size) { 1753 STp->dirty = 1; 1754 /* Don't write a buffer that is not full enough. */ 1755 if (!async_write && count == 0) 1756 break; 1757 } 1758 1759 retry_write: 1760 if (STp->block_size == 0) 1761 blks = transfer = do_count; 1762 else { 1763 if (!STbp->do_dio) 1764 blks = STbp->buffer_bytes; 1765 else 1766 blks = do_count; 1767 blks /= STp->block_size; 1768 transfer = blks * STp->block_size; 1769 } 1770 cmd[2] = blks >> 16; 1771 cmd[3] = blks >> 8; 1772 cmd[4] = blks; 1773 1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1775 STp->device->request_queue->rq_timeout, 1776 MAX_WRITE_RETRIES, !async_write); 1777 if (!SRpnt) { 1778 retval = STbp->syscall_result; 1779 goto out; 1780 } 1781 if (async_write && !STbp->syscall_result) { 1782 STbp->writing = transfer; 1783 STp->dirty = !(STbp->writing == 1784 STbp->buffer_bytes); 1785 SRpnt = NULL; /* Prevent releasing this request! */ 1786 DEB( STp->write_pending = 1; ) 1787 break; 1788 } 1789 1790 if (STbp->syscall_result != 0) { 1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1792 1793 DEBC_printk(STp, "Error on write:\n"); 1794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1795 scode = cmdstatp->sense_hdr.sense_key; 1796 if (cmdstatp->remainder_valid) 1797 undone = (int)cmdstatp->uremainder64; 1798 else if (STp->block_size == 0 && 1799 scode == VOLUME_OVERFLOW) 1800 undone = transfer; 1801 else 1802 undone = 0; 1803 if (STp->block_size != 0) 1804 undone *= STp->block_size; 1805 if (undone <= do_count) { 1806 /* Only data from this write is not written */ 1807 count += undone; 1808 b_point -= undone; 1809 do_count -= undone; 1810 if (STp->block_size) 1811 blks = (transfer - undone) / STp->block_size; 1812 STps->eof = ST_EOM_OK; 1813 /* Continue in fixed block mode if all written 1814 in this request but still something left to write 1815 (retval left to zero) 1816 */ 1817 if (STp->block_size == 0 || 1818 undone > 0 || count == 0) 1819 retval = (-ENOSPC); /* EOM within current request */ 1820 DEBC_printk(STp, "EOM with %d " 1821 "bytes unwritten.\n", 1822 (int)count); 1823 } else { 1824 /* EOT within data buffered earlier (possible only 1825 in fixed block mode without direct i/o) */ 1826 if (!retry_eot && !cmdstatp->deferred && 1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1828 move_buffer_data(STp->buffer, transfer - undone); 1829 retry_eot = 1; 1830 if (STps->drv_block >= 0) { 1831 STps->drv_block += (transfer - undone) / 1832 STp->block_size; 1833 } 1834 STps->eof = ST_EOM_OK; 1835 DEBC_printk(STp, "Retry " 1836 "write of %d " 1837 "bytes at EOM.\n", 1838 STp->buffer->buffer_bytes); 1839 goto retry_write; 1840 } 1841 else { 1842 /* Either error within data buffered by driver or 1843 failed retry */ 1844 count -= do_count; 1845 blks = do_count = 0; 1846 STps->eof = ST_EOM_ERROR; 1847 STps->drv_block = (-1); /* Too cautious? */ 1848 retval = (-EIO); /* EOM for old data */ 1849 DEBC_printk(STp, "EOM with " 1850 "lost data.\n"); 1851 } 1852 } 1853 } else { 1854 count += do_count; 1855 STps->drv_block = (-1); /* Too cautious? */ 1856 retval = STbp->syscall_result; 1857 } 1858 1859 } 1860 1861 if (STps->drv_block >= 0) { 1862 if (STp->block_size == 0) 1863 STps->drv_block += (do_count > 0); 1864 else 1865 STps->drv_block += blks; 1866 } 1867 1868 STbp->buffer_bytes = 0; 1869 STp->dirty = 0; 1870 1871 if (retval || retry_eot) { 1872 if (count < total) 1873 retval = total - count; 1874 goto out; 1875 } 1876 } 1877 1878 if (STps->eof == ST_EOD_1) 1879 STps->eof = ST_EOM_OK; 1880 else if (STps->eof != ST_EOM_OK) 1881 STps->eof = ST_NOEOF; 1882 retval = total - count; 1883 1884 out: 1885 if (SRpnt != NULL) 1886 st_release_request(SRpnt); 1887 release_buffering(STp, 0); 1888 mutex_unlock(&STp->lock); 1889 1890 return retval; 1891 } 1892 1893 /* Read data from the tape. Returns zero in the normal case, one if the 1894 eof status has changed, and the negative error code in case of a 1895 fatal error. Otherwise updates the buffer and the eof state. 1896 1897 Does release user buffer mapping if it is set. 1898 */ 1899 static long read_tape(struct scsi_tape *STp, long count, 1900 struct st_request ** aSRpnt) 1901 { 1902 int transfer, blks, bytes; 1903 unsigned char cmd[MAX_COMMAND_SIZE]; 1904 struct st_request *SRpnt; 1905 struct st_modedef *STm; 1906 struct st_partstat *STps; 1907 struct st_buffer *STbp; 1908 int retval = 0; 1909 1910 if (count == 0) 1911 return 0; 1912 1913 STm = &(STp->modes[STp->current_mode]); 1914 STps = &(STp->ps[STp->partition]); 1915 if (STps->eof == ST_FM_HIT) 1916 return 1; 1917 STbp = STp->buffer; 1918 1919 if (STp->block_size == 0) 1920 blks = bytes = count; 1921 else { 1922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1923 blks = (STp->buffer)->buffer_blocks; 1924 bytes = blks * STp->block_size; 1925 } else { 1926 bytes = count; 1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1928 bytes = (STp->buffer)->buffer_size; 1929 blks = bytes / STp->block_size; 1930 bytes = blks * STp->block_size; 1931 } 1932 } 1933 1934 memset(cmd, 0, MAX_COMMAND_SIZE); 1935 cmd[0] = READ_6; 1936 cmd[1] = (STp->block_size != 0); 1937 if (!cmd[1] && STp->sili) 1938 cmd[1] |= 2; 1939 cmd[2] = blks >> 16; 1940 cmd[3] = blks >> 8; 1941 cmd[4] = blks; 1942 1943 SRpnt = *aSRpnt; 1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1945 STp->device->request_queue->rq_timeout, 1946 MAX_RETRIES, 1); 1947 release_buffering(STp, 1); 1948 *aSRpnt = SRpnt; 1949 if (!SRpnt) 1950 return STbp->syscall_result; 1951 1952 STbp->read_pointer = 0; 1953 STps->at_sm = 0; 1954 1955 /* Something to check */ 1956 if (STbp->syscall_result) { 1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1958 1959 retval = 1; 1960 DEBC_printk(STp, 1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1962 SRpnt->sense[0], SRpnt->sense[1], 1963 SRpnt->sense[2], SRpnt->sense[3], 1964 SRpnt->sense[4], SRpnt->sense[5], 1965 SRpnt->sense[6], SRpnt->sense[7]); 1966 if (cmdstatp->have_sense) { 1967 1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1970 1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1972 /* Compute the residual count */ 1973 if (cmdstatp->remainder_valid) 1974 transfer = (int)cmdstatp->uremainder64; 1975 else 1976 transfer = 0; 1977 if (STp->block_size == 0 && 1978 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) 1979 transfer = bytes; 1980 1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1982 if (STp->block_size == 0 && 1983 transfer < 0) { 1984 st_printk(KERN_NOTICE, STp, 1985 "Failed to read %d " 1986 "byte block with %d " 1987 "byte transfer.\n", 1988 bytes - transfer, 1989 bytes); 1990 if (STps->drv_block >= 0) 1991 STps->drv_block += 1; 1992 STbp->buffer_bytes = 0; 1993 return (-ENOMEM); 1994 } else if (STp->block_size == 0) { 1995 STbp->buffer_bytes = bytes - transfer; 1996 } else { 1997 st_release_request(SRpnt); 1998 SRpnt = *aSRpnt = NULL; 1999 if (transfer == blks) { /* We did not get anything, error */ 2000 st_printk(KERN_NOTICE, STp, 2001 "Incorrect " 2002 "block size.\n"); 2003 if (STps->drv_block >= 0) 2004 STps->drv_block += blks - transfer + 1; 2005 st_int_ioctl(STp, MTBSR, 1); 2006 return (-EIO); 2007 } 2008 /* We have some data, deliver it */ 2009 STbp->buffer_bytes = (blks - transfer) * 2010 STp->block_size; 2011 DEBC_printk(STp, "ILI but " 2012 "enough data " 2013 "received %ld " 2014 "%d.\n", count, 2015 STbp->buffer_bytes); 2016 if (STps->drv_block >= 0) 2017 STps->drv_block += 1; 2018 if (st_int_ioctl(STp, MTBSR, 1)) 2019 return (-EIO); 2020 } 2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 2022 if (STps->eof != ST_FM_HIT) 2023 STps->eof = ST_FM_HIT; 2024 else 2025 STps->eof = ST_EOD_2; 2026 if (STp->block_size == 0) 2027 STbp->buffer_bytes = 0; 2028 else 2029 STbp->buffer_bytes = 2030 bytes - transfer * STp->block_size; 2031 DEBC_printk(STp, "EOF detected (%d " 2032 "bytes read).\n", 2033 STbp->buffer_bytes); 2034 } else if (cmdstatp->flags & SENSE_EOM) { 2035 if (STps->eof == ST_FM) 2036 STps->eof = ST_EOD_1; 2037 else 2038 STps->eof = ST_EOM_OK; 2039 if (STp->block_size == 0) 2040 STbp->buffer_bytes = bytes - transfer; 2041 else 2042 STbp->buffer_bytes = 2043 bytes - transfer * STp->block_size; 2044 2045 DEBC_printk(STp, "EOM detected (%d " 2046 "bytes read).\n", 2047 STbp->buffer_bytes); 2048 } 2049 } 2050 /* end of EOF, EOM, ILI test */ 2051 else { /* nonzero sense key */ 2052 DEBC_printk(STp, "Tape error while reading.\n"); 2053 STps->drv_block = (-1); 2054 if (STps->eof == ST_FM && 2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 2056 DEBC_printk(STp, "Zero returned for " 2057 "first BLANK CHECK " 2058 "after EOF.\n"); 2059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 2060 } else /* Some other extended sense code */ 2061 retval = (-EIO); 2062 } 2063 2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 2065 STbp->buffer_bytes = 0; 2066 } 2067 /* End of extended sense test */ 2068 else { /* Non-extended sense */ 2069 retval = STbp->syscall_result; 2070 } 2071 2072 } 2073 /* End of error handling */ 2074 else { /* Read successful */ 2075 STbp->buffer_bytes = bytes; 2076 if (STp->sili) /* In fixed block mode residual is always zero here */ 2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2078 } 2079 2080 if (STps->drv_block >= 0) { 2081 if (STp->block_size == 0) 2082 STps->drv_block++; 2083 else 2084 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2085 } 2086 return retval; 2087 } 2088 2089 2090 /* Read command */ 2091 static ssize_t 2092 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2093 { 2094 ssize_t total; 2095 ssize_t retval = 0; 2096 ssize_t i, transfer; 2097 int special, do_dio = 0; 2098 struct st_request *SRpnt = NULL; 2099 struct scsi_tape *STp = filp->private_data; 2100 struct st_modedef *STm; 2101 struct st_partstat *STps; 2102 struct st_buffer *STbp = STp->buffer; 2103 2104 if (mutex_lock_interruptible(&STp->lock)) 2105 return -ERESTARTSYS; 2106 2107 retval = rw_checks(STp, filp, count); 2108 if (retval || count == 0) 2109 goto out; 2110 2111 STm = &(STp->modes[STp->current_mode]); 2112 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2113 if (!STm->do_read_ahead) { 2114 retval = (-EINVAL); /* Read must be integral number of blocks */ 2115 goto out; 2116 } 2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2118 } 2119 2120 STps = &(STp->ps[STp->partition]); 2121 if (STps->rw == ST_WRITING) { 2122 retval = flush_buffer(STp, 0); 2123 if (retval) 2124 goto out; 2125 STps->rw = ST_READING; 2126 } 2127 DEB( 2128 if (debugging && STps->eof != ST_NOEOF) 2129 st_printk(ST_DEB_MSG, STp, 2130 "EOF/EOM flag up (%d). Bytes %d\n", 2131 STps->eof, STbp->buffer_bytes); 2132 ) /* end DEB */ 2133 2134 retval = setup_buffering(STp, buf, count, 1); 2135 if (retval) 2136 goto out; 2137 do_dio = STbp->do_dio; 2138 2139 if (STbp->buffer_bytes == 0 && 2140 STps->eof >= ST_EOD_1) { 2141 if (STps->eof < ST_EOD) { 2142 STps->eof += 1; 2143 retval = 0; 2144 goto out; 2145 } 2146 retval = (-EIO); /* EOM or Blank Check */ 2147 goto out; 2148 } 2149 2150 if (do_dio) { 2151 /* Check the buffer writability before any tape movement. Don't alter 2152 buffer data. */ 2153 if (copy_from_user(&i, buf, 1) != 0 || 2154 copy_to_user(buf, &i, 1) != 0 || 2155 copy_from_user(&i, buf + count - 1, 1) != 0 || 2156 copy_to_user(buf + count - 1, &i, 1) != 0) { 2157 retval = (-EFAULT); 2158 goto out; 2159 } 2160 } 2161 2162 STps->rw = ST_READING; 2163 2164 2165 /* Loop until enough data in buffer or a special condition found */ 2166 for (total = 0, special = 0; total < count && !special;) { 2167 2168 /* Get new data if the buffer is empty */ 2169 if (STbp->buffer_bytes == 0) { 2170 special = read_tape(STp, count - total, &SRpnt); 2171 if (special < 0) { /* No need to continue read */ 2172 retval = special; 2173 goto out; 2174 } 2175 } 2176 2177 /* Move the data from driver buffer to user buffer */ 2178 if (STbp->buffer_bytes > 0) { 2179 DEB( 2180 if (debugging && STps->eof != ST_NOEOF) 2181 st_printk(ST_DEB_MSG, STp, 2182 "EOF up (%d). Left %d, needed %d.\n", 2183 STps->eof, STbp->buffer_bytes, 2184 (int)(count - total)); 2185 ) /* end DEB */ 2186 transfer = STbp->buffer_bytes < count - total ? 2187 STbp->buffer_bytes : count - total; 2188 if (!do_dio) { 2189 i = from_buffer(STbp, buf, transfer); 2190 if (i) { 2191 retval = i; 2192 goto out; 2193 } 2194 } 2195 buf += transfer; 2196 total += transfer; 2197 } 2198 2199 if (STp->block_size == 0) 2200 break; /* Read only one variable length block */ 2201 2202 } /* for (total = 0, special = 0; 2203 total < count && !special; ) */ 2204 2205 /* Change the eof state if no data from tape or buffer */ 2206 if (total == 0) { 2207 if (STps->eof == ST_FM_HIT) { 2208 STps->eof = ST_FM; 2209 STps->drv_block = 0; 2210 if (STps->drv_file >= 0) 2211 STps->drv_file++; 2212 } else if (STps->eof == ST_EOD_1) { 2213 STps->eof = ST_EOD_2; 2214 STps->drv_block = 0; 2215 if (STps->drv_file >= 0) 2216 STps->drv_file++; 2217 } else if (STps->eof == ST_EOD_2) 2218 STps->eof = ST_EOD; 2219 } else if (STps->eof == ST_FM) 2220 STps->eof = ST_NOEOF; 2221 retval = total; 2222 2223 out: 2224 if (SRpnt != NULL) { 2225 st_release_request(SRpnt); 2226 SRpnt = NULL; 2227 } 2228 if (do_dio) { 2229 release_buffering(STp, 1); 2230 STbp->buffer_bytes = 0; 2231 } 2232 mutex_unlock(&STp->lock); 2233 2234 return retval; 2235 } 2236 2237 2238 2239 DEB( 2240 /* Set the driver options */ 2241 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) 2242 { 2243 if (debugging) { 2244 st_printk(KERN_INFO, STp, 2245 "Mode %d options: buffer writes: %d, " 2246 "async writes: %d, read ahead: %d\n", 2247 STp->current_mode, STm->do_buffer_writes, 2248 STm->do_async_writes, STm->do_read_ahead); 2249 st_printk(KERN_INFO, STp, 2250 " can bsr: %d, two FMs: %d, " 2251 "fast mteom: %d, auto lock: %d,\n", 2252 STp->can_bsr, STp->two_fm, STp->fast_mteom, 2253 STp->do_auto_lock); 2254 st_printk(KERN_INFO, STp, 2255 " defs for wr: %d, no block limits: %d, " 2256 "partitions: %d, s2 log: %d\n", 2257 STm->defaults_for_writes, STp->omit_blklims, 2258 STp->can_partitions, STp->scsi2_logical); 2259 st_printk(KERN_INFO, STp, 2260 " sysv: %d nowait: %d sili: %d " 2261 "nowait_filemark: %d\n", 2262 STm->sysv, STp->immediate, STp->sili, 2263 STp->immediate_filemark); 2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); 2265 } 2266 } 2267 ) 2268 2269 2270 static int st_set_options(struct scsi_tape *STp, long options) 2271 { 2272 int value; 2273 long code; 2274 struct st_modedef *STm; 2275 struct cdev *cd0, *cd1; 2276 struct device *d0, *d1; 2277 2278 STm = &(STp->modes[STp->current_mode]); 2279 if (!STm->defined) { 2280 cd0 = STm->cdevs[0]; 2281 cd1 = STm->cdevs[1]; 2282 d0 = STm->devs[0]; 2283 d1 = STm->devs[1]; 2284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2285 STm->cdevs[0] = cd0; 2286 STm->cdevs[1] = cd1; 2287 STm->devs[0] = d0; 2288 STm->devs[1] = d1; 2289 modes_defined = 1; 2290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", 2291 STp->current_mode); 2292 } 2293 2294 code = options & MT_ST_OPTIONS; 2295 if (code == MT_ST_BOOLEANS) { 2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2305 if ((STp->device)->scsi_level >= SCSI_2) 2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2308 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2310 STm->sysv = (options & MT_ST_SYSV) != 0; 2311 STp->sili = (options & MT_ST_SILI) != 0; 2312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2313 st_log_options(STp, STm); ) 2314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2315 value = (code == MT_ST_SETBOOLEANS); 2316 if ((options & MT_ST_BUFFER_WRITES) != 0) 2317 STm->do_buffer_writes = value; 2318 if ((options & MT_ST_ASYNC_WRITES) != 0) 2319 STm->do_async_writes = value; 2320 if ((options & MT_ST_DEF_WRITES) != 0) 2321 STm->defaults_for_writes = value; 2322 if ((options & MT_ST_READ_AHEAD) != 0) 2323 STm->do_read_ahead = value; 2324 if ((options & MT_ST_TWO_FM) != 0) 2325 STp->two_fm = value; 2326 if ((options & MT_ST_FAST_MTEOM) != 0) 2327 STp->fast_mteom = value; 2328 if ((options & MT_ST_AUTO_LOCK) != 0) 2329 STp->do_auto_lock = value; 2330 if ((options & MT_ST_CAN_BSR) != 0) 2331 STp->can_bsr = value; 2332 if ((options & MT_ST_NO_BLKLIMS) != 0) 2333 STp->omit_blklims = value; 2334 if ((STp->device)->scsi_level >= SCSI_2 && 2335 (options & MT_ST_CAN_PARTITIONS) != 0) 2336 STp->can_partitions = value; 2337 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2338 STp->scsi2_logical = value; 2339 if ((options & MT_ST_NOWAIT) != 0) 2340 STp->immediate = value; 2341 if ((options & MT_ST_NOWAIT_EOF) != 0) 2342 STp->immediate_filemark = value; 2343 if ((options & MT_ST_SYSV) != 0) 2344 STm->sysv = value; 2345 if ((options & MT_ST_SILI) != 0) 2346 STp->sili = value; 2347 DEB( 2348 if ((options & MT_ST_DEBUGGING) != 0) 2349 debugging = value; 2350 st_log_options(STp, STm); ) 2351 } else if (code == MT_ST_WRITE_THRESHOLD) { 2352 /* Retained for compatibility */ 2353 } else if (code == MT_ST_DEF_BLKSIZE) { 2354 value = (options & ~MT_ST_OPTIONS); 2355 if (value == ~MT_ST_OPTIONS) { 2356 STm->default_blksize = (-1); 2357 DEBC_printk(STp, "Default block size disabled.\n"); 2358 } else { 2359 STm->default_blksize = value; 2360 DEBC_printk(STp,"Default block size set to " 2361 "%d bytes.\n", STm->default_blksize); 2362 if (STp->ready == ST_READY) { 2363 STp->blksize_changed = 0; 2364 set_mode_densblk(STp, STm); 2365 } 2366 } 2367 } else if (code == MT_ST_TIMEOUTS) { 2368 value = (options & ~MT_ST_OPTIONS); 2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2371 DEBC_printk(STp, "Long timeout set to %d seconds.\n", 2372 (value & ~MT_ST_SET_LONG_TIMEOUT)); 2373 } else { 2374 blk_queue_rq_timeout(STp->device->request_queue, 2375 value * HZ); 2376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n", 2377 value); 2378 } 2379 } else if (code == MT_ST_SET_CLN) { 2380 value = (options & ~MT_ST_OPTIONS) & 0xff; 2381 if (value != 0 && 2382 (value < EXTENDED_SENSE_START || 2383 value >= SCSI_SENSE_BUFFERSIZE)) 2384 return (-EINVAL); 2385 STp->cln_mode = value; 2386 STp->cln_sense_mask = (options >> 8) & 0xff; 2387 STp->cln_sense_value = (options >> 16) & 0xff; 2388 st_printk(KERN_INFO, STp, 2389 "Cleaning request mode %d, mask %02x, value %02x\n", 2390 value, STp->cln_sense_mask, STp->cln_sense_value); 2391 } else if (code == MT_ST_DEF_OPTIONS) { 2392 code = (options & ~MT_ST_CLEAR_DEFAULT); 2393 value = (options & MT_ST_CLEAR_DEFAULT); 2394 if (code == MT_ST_DEF_DENSITY) { 2395 if (value == MT_ST_CLEAR_DEFAULT) { 2396 STm->default_density = (-1); 2397 DEBC_printk(STp, 2398 "Density default disabled.\n"); 2399 } else { 2400 STm->default_density = value & 0xff; 2401 DEBC_printk(STp, "Density default set to %x\n", 2402 STm->default_density); 2403 if (STp->ready == ST_READY) { 2404 STp->density_changed = 0; 2405 set_mode_densblk(STp, STm); 2406 } 2407 } 2408 } else if (code == MT_ST_DEF_DRVBUFFER) { 2409 if (value == MT_ST_CLEAR_DEFAULT) { 2410 STp->default_drvbuffer = 0xff; 2411 DEBC_printk(STp, 2412 "Drive buffer default disabled.\n"); 2413 } else { 2414 STp->default_drvbuffer = value & 7; 2415 DEBC_printk(STp, 2416 "Drive buffer default set to %x\n", 2417 STp->default_drvbuffer); 2418 if (STp->ready == ST_READY) 2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2420 } 2421 } else if (code == MT_ST_DEF_COMPRESSION) { 2422 if (value == MT_ST_CLEAR_DEFAULT) { 2423 STm->default_compression = ST_DONT_TOUCH; 2424 DEBC_printk(STp, 2425 "Compression default disabled.\n"); 2426 } else { 2427 if ((value & 0xff00) != 0) { 2428 STp->c_algo = (value & 0xff00) >> 8; 2429 DEBC_printk(STp, "Compression " 2430 "algorithm set to 0x%x.\n", 2431 STp->c_algo); 2432 } 2433 if ((value & 0xff) != 0xff) { 2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2435 DEBC_printk(STp, "Compression default " 2436 "set to %x\n", 2437 (value & 1)); 2438 if (STp->ready == ST_READY) { 2439 STp->compression_changed = 0; 2440 st_compression(STp, (STm->default_compression == ST_YES)); 2441 } 2442 } 2443 } 2444 } 2445 } else 2446 return (-EIO); 2447 2448 return 0; 2449 } 2450 2451 #define MODE_HEADER_LENGTH 4 2452 2453 /* Mode header and page byte offsets */ 2454 #define MH_OFF_DATA_LENGTH 0 2455 #define MH_OFF_MEDIUM_TYPE 1 2456 #define MH_OFF_DEV_SPECIFIC 2 2457 #define MH_OFF_BDESCS_LENGTH 3 2458 #define MP_OFF_PAGE_NBR 0 2459 #define MP_OFF_PAGE_LENGTH 1 2460 2461 /* Mode header and page bit masks */ 2462 #define MH_BIT_WP 0x80 2463 #define MP_MSK_PAGE_NBR 0x3f 2464 2465 /* Don't return block descriptors */ 2466 #define MODE_SENSE_OMIT_BDESCS 0x08 2467 2468 #define MODE_SELECT_PAGE_FORMAT 0x10 2469 2470 /* Read a mode page into the tape buffer. The block descriptors are included 2471 if incl_block_descs is true. The page control is ored to the page number 2472 parameter, if necessary. */ 2473 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2474 { 2475 unsigned char cmd[MAX_COMMAND_SIZE]; 2476 struct st_request *SRpnt; 2477 2478 memset(cmd, 0, MAX_COMMAND_SIZE); 2479 cmd[0] = MODE_SENSE; 2480 if (omit_block_descs) 2481 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2482 cmd[2] = page; 2483 cmd[4] = 255; 2484 2485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2486 STp->device->request_queue->rq_timeout, 0, 1); 2487 if (SRpnt == NULL) 2488 return (STp->buffer)->syscall_result; 2489 2490 st_release_request(SRpnt); 2491 2492 return STp->buffer->syscall_result; 2493 } 2494 2495 2496 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2498 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2499 { 2500 int pgo; 2501 unsigned char cmd[MAX_COMMAND_SIZE]; 2502 struct st_request *SRpnt; 2503 int timeout; 2504 2505 memset(cmd, 0, MAX_COMMAND_SIZE); 2506 cmd[0] = MODE_SELECT; 2507 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2510 2511 /* Clear reserved fields */ 2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2516 2517 timeout = slow ? 2518 STp->long_timeout : STp->device->request_queue->rq_timeout; 2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2520 timeout, 0, 1); 2521 if (SRpnt == NULL) 2522 return (STp->buffer)->syscall_result; 2523 2524 st_release_request(SRpnt); 2525 2526 return STp->buffer->syscall_result; 2527 } 2528 2529 2530 #define COMPRESSION_PAGE 0x0f 2531 #define COMPRESSION_PAGE_LENGTH 16 2532 2533 #define CP_OFF_DCE_DCC 2 2534 #define CP_OFF_C_ALGO 7 2535 2536 #define DCE_MASK 0x80 2537 #define DCC_MASK 0x40 2538 #define RED_MASK 0x60 2539 2540 2541 /* Control the compression with mode page 15. Algorithm not changed if zero. 2542 2543 The block descriptors are read and written because Sony SDT-7000 does not 2544 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2545 Including block descriptors should not cause any harm to other drives. */ 2546 2547 static int st_compression(struct scsi_tape * STp, int state) 2548 { 2549 int retval; 2550 int mpoffs; /* Offset to mode page start */ 2551 unsigned char *b_data = (STp->buffer)->b_data; 2552 2553 if (STp->ready != ST_READY) 2554 return (-EIO); 2555 2556 /* Read the current page contents */ 2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2558 if (retval) { 2559 DEBC_printk(STp, "Compression mode page not supported.\n"); 2560 return (-EIO); 2561 } 2562 2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2564 DEBC_printk(STp, "Compression state is %d.\n", 2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); 2566 2567 /* Check if compression can be changed */ 2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2569 DEBC_printk(STp, "Compression not supported.\n"); 2570 return (-EIO); 2571 } 2572 2573 /* Do the change */ 2574 if (state) { 2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2576 if (STp->c_algo != 0) 2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2578 } 2579 else { 2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2581 if (STp->c_algo != 0) 2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2583 } 2584 2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2586 if (retval) { 2587 DEBC_printk(STp, "Compression change failed.\n"); 2588 return (-EIO); 2589 } 2590 DEBC_printk(STp, "Compression state changed to %d.\n", state); 2591 2592 STp->compression_changed = 1; 2593 return 0; 2594 } 2595 2596 2597 /* Process the load and unload commands (does unload if the load code is zero) */ 2598 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2599 { 2600 int retval = (-EIO), timeout; 2601 unsigned char cmd[MAX_COMMAND_SIZE]; 2602 struct st_partstat *STps; 2603 struct st_request *SRpnt; 2604 2605 if (STp->ready != ST_READY && !load_code) { 2606 if (STp->ready == ST_NO_TAPE) 2607 return (-ENOMEDIUM); 2608 else 2609 return (-EIO); 2610 } 2611 2612 memset(cmd, 0, MAX_COMMAND_SIZE); 2613 cmd[0] = START_STOP; 2614 if (load_code) 2615 cmd[4] |= 1; 2616 /* 2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2618 */ 2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n", 2622 (cmd[4]) ? "" : "un", 2623 load_code - MT_ST_HPLOADER_OFFSET); 2624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2625 } 2626 if (STp->immediate) { 2627 cmd[1] = 1; /* Don't wait for completion */ 2628 timeout = STp->device->request_queue->rq_timeout; 2629 } 2630 else 2631 timeout = STp->long_timeout; 2632 2633 DEBC( 2634 if (!load_code) 2635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); 2636 else 2637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); 2638 ); 2639 2640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2641 timeout, MAX_RETRIES, 1); 2642 if (!SRpnt) 2643 return (STp->buffer)->syscall_result; 2644 2645 retval = (STp->buffer)->syscall_result; 2646 st_release_request(SRpnt); 2647 2648 if (!retval) { /* SCSI command successful */ 2649 2650 if (!load_code) { 2651 STp->rew_at_close = 0; 2652 STp->ready = ST_NO_TAPE; 2653 } 2654 else { 2655 STp->rew_at_close = STp->autorew_dev; 2656 retval = check_tape(STp, filp); 2657 if (retval > 0) 2658 retval = 0; 2659 } 2660 } 2661 else { 2662 STps = &(STp->ps[STp->partition]); 2663 STps->drv_file = STps->drv_block = (-1); 2664 } 2665 2666 return retval; 2667 } 2668 2669 #if DEBUG 2670 #define ST_DEB_FORWARD 0 2671 #define ST_DEB_BACKWARD 1 2672 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) 2673 { 2674 s32 sc; 2675 2676 if (!debugging) 2677 return; 2678 2679 sc = cmd[2] & 0x80 ? 0xff000000 : 0; 2680 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; 2681 if (direction) 2682 sc = -sc; 2683 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2684 direction ? "backward" : "forward", sc, units); 2685 } 2686 #else 2687 #define ST_DEB_FORWARD 0 2688 #define ST_DEB_BACKWARD 1 2689 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2690 #endif 2691 2692 2693 /* Internal ioctl function */ 2694 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2695 { 2696 int timeout; 2697 long ltmp; 2698 int ioctl_result; 2699 int chg_eof = 1; 2700 unsigned char cmd[MAX_COMMAND_SIZE]; 2701 struct st_request *SRpnt; 2702 struct st_partstat *STps; 2703 int fileno, blkno, at_sm, undone; 2704 int datalen = 0, direction = DMA_NONE; 2705 2706 WARN_ON(STp->buffer->do_dio != 0); 2707 if (STp->ready != ST_READY) { 2708 if (STp->ready == ST_NO_TAPE) 2709 return (-ENOMEDIUM); 2710 else 2711 return (-EIO); 2712 } 2713 timeout = STp->long_timeout; 2714 STps = &(STp->ps[STp->partition]); 2715 fileno = STps->drv_file; 2716 blkno = STps->drv_block; 2717 at_sm = STps->at_sm; 2718 2719 memset(cmd, 0, MAX_COMMAND_SIZE); 2720 switch (cmd_in) { 2721 case MTFSFM: 2722 chg_eof = 0; /* Changed from the FSF after this */ 2723 case MTFSF: 2724 cmd[0] = SPACE; 2725 cmd[1] = 0x01; /* Space FileMarks */ 2726 cmd[2] = (arg >> 16); 2727 cmd[3] = (arg >> 8); 2728 cmd[4] = arg; 2729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2730 if (fileno >= 0) 2731 fileno += arg; 2732 blkno = 0; 2733 at_sm &= (arg == 0); 2734 break; 2735 case MTBSFM: 2736 chg_eof = 0; /* Changed from the FSF after this */ 2737 case MTBSF: 2738 cmd[0] = SPACE; 2739 cmd[1] = 0x01; /* Space FileMarks */ 2740 ltmp = (-arg); 2741 cmd[2] = (ltmp >> 16); 2742 cmd[3] = (ltmp >> 8); 2743 cmd[4] = ltmp; 2744 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2745 if (fileno >= 0) 2746 fileno -= arg; 2747 blkno = (-1); /* We can't know the block number */ 2748 at_sm &= (arg == 0); 2749 break; 2750 case MTFSR: 2751 cmd[0] = SPACE; 2752 cmd[1] = 0x00; /* Space Blocks */ 2753 cmd[2] = (arg >> 16); 2754 cmd[3] = (arg >> 8); 2755 cmd[4] = arg; 2756 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2757 if (blkno >= 0) 2758 blkno += arg; 2759 at_sm &= (arg == 0); 2760 break; 2761 case MTBSR: 2762 cmd[0] = SPACE; 2763 cmd[1] = 0x00; /* Space Blocks */ 2764 ltmp = (-arg); 2765 cmd[2] = (ltmp >> 16); 2766 cmd[3] = (ltmp >> 8); 2767 cmd[4] = ltmp; 2768 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2769 if (blkno >= 0) 2770 blkno -= arg; 2771 at_sm &= (arg == 0); 2772 break; 2773 case MTFSS: 2774 cmd[0] = SPACE; 2775 cmd[1] = 0x04; /* Space Setmarks */ 2776 cmd[2] = (arg >> 16); 2777 cmd[3] = (arg >> 8); 2778 cmd[4] = arg; 2779 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2780 if (arg != 0) { 2781 blkno = fileno = (-1); 2782 at_sm = 1; 2783 } 2784 break; 2785 case MTBSS: 2786 cmd[0] = SPACE; 2787 cmd[1] = 0x04; /* Space Setmarks */ 2788 ltmp = (-arg); 2789 cmd[2] = (ltmp >> 16); 2790 cmd[3] = (ltmp >> 8); 2791 cmd[4] = ltmp; 2792 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2793 if (arg != 0) { 2794 blkno = fileno = (-1); 2795 at_sm = 1; 2796 } 2797 break; 2798 case MTWEOF: 2799 case MTWEOFI: 2800 case MTWSM: 2801 if (STp->write_prot) 2802 return (-EACCES); 2803 cmd[0] = WRITE_FILEMARKS; 2804 if (cmd_in == MTWSM) 2805 cmd[1] = 2; 2806 if (cmd_in == MTWEOFI || 2807 (cmd_in == MTWEOF && STp->immediate_filemark)) 2808 cmd[1] |= 1; 2809 cmd[2] = (arg >> 16); 2810 cmd[3] = (arg >> 8); 2811 cmd[4] = arg; 2812 timeout = STp->device->request_queue->rq_timeout; 2813 DEBC( 2814 if (cmd_in != MTWSM) 2815 st_printk(ST_DEB_MSG, STp, 2816 "Writing %d filemarks.\n", 2817 cmd[2] * 65536 + 2818 cmd[3] * 256 + 2819 cmd[4]); 2820 else 2821 st_printk(ST_DEB_MSG, STp, 2822 "Writing %d setmarks.\n", 2823 cmd[2] * 65536 + 2824 cmd[3] * 256 + 2825 cmd[4]); 2826 ) 2827 if (fileno >= 0) 2828 fileno += arg; 2829 blkno = 0; 2830 at_sm = (cmd_in == MTWSM); 2831 break; 2832 case MTREW: 2833 cmd[0] = REZERO_UNIT; 2834 if (STp->immediate) { 2835 cmd[1] = 1; /* Don't wait for completion */ 2836 timeout = STp->device->request_queue->rq_timeout; 2837 } 2838 DEBC_printk(STp, "Rewinding tape.\n"); 2839 fileno = blkno = at_sm = 0; 2840 break; 2841 case MTNOP: 2842 DEBC_printk(STp, "No op on tape.\n"); 2843 return 0; /* Should do something ? */ 2844 break; 2845 case MTRETEN: 2846 cmd[0] = START_STOP; 2847 if (STp->immediate) { 2848 cmd[1] = 1; /* Don't wait for completion */ 2849 timeout = STp->device->request_queue->rq_timeout; 2850 } 2851 cmd[4] = 3; 2852 DEBC_printk(STp, "Retensioning tape.\n"); 2853 fileno = blkno = at_sm = 0; 2854 break; 2855 case MTEOM: 2856 if (!STp->fast_mteom) { 2857 /* space to the end of tape */ 2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2859 fileno = STps->drv_file; 2860 if (STps->eof >= ST_EOD_1) 2861 return 0; 2862 /* The next lines would hide the number of spaced FileMarks 2863 That's why I inserted the previous lines. I had no luck 2864 with detecting EOM with FSF, so we go now to EOM. 2865 Joerg Weule */ 2866 } else 2867 fileno = (-1); 2868 cmd[0] = SPACE; 2869 cmd[1] = 3; 2870 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2871 blkno = -1; 2872 at_sm = 0; 2873 break; 2874 case MTERASE: 2875 if (STp->write_prot) 2876 return (-EACCES); 2877 cmd[0] = ERASE; 2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2879 if (STp->immediate) { 2880 cmd[1] |= 2; /* Don't wait for completion */ 2881 timeout = STp->device->request_queue->rq_timeout; 2882 } 2883 else 2884 timeout = STp->long_timeout * 8; 2885 2886 DEBC_printk(STp, "Erasing tape.\n"); 2887 fileno = blkno = at_sm = 0; 2888 break; 2889 case MTSETBLK: /* Set block length */ 2890 case MTSETDENSITY: /* Set tape density */ 2891 case MTSETDRVBUFFER: /* Set drive buffering */ 2892 case SET_DENS_AND_BLK: /* Set density and block size */ 2893 chg_eof = 0; 2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2895 return (-EIO); /* Not allowed if data in buffer */ 2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2897 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2898 STp->max_block > 0 && 2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2901 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2902 return (-EINVAL); 2903 } 2904 cmd[0] = MODE_SELECT; 2905 if ((STp->use_pf & USE_PF)) 2906 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2907 cmd[4] = datalen = 12; 2908 direction = DMA_TO_DEVICE; 2909 2910 memset((STp->buffer)->b_data, 0, 12); 2911 if (cmd_in == MTSETDRVBUFFER) 2912 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2913 else 2914 (STp->buffer)->b_data[2] = 2915 STp->drv_buffer << 4; 2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2917 if (cmd_in == MTSETDENSITY) { 2918 (STp->buffer)->b_data[4] = arg; 2919 STp->density_changed = 1; /* At least we tried ;-) */ 2920 } else if (cmd_in == SET_DENS_AND_BLK) 2921 (STp->buffer)->b_data[4] = arg >> 24; 2922 else 2923 (STp->buffer)->b_data[4] = STp->density; 2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2925 ltmp = arg & MT_ST_BLKSIZE_MASK; 2926 if (cmd_in == MTSETBLK) 2927 STp->blksize_changed = 1; /* At least we tried ;-) */ 2928 } else 2929 ltmp = STp->block_size; 2930 (STp->buffer)->b_data[9] = (ltmp >> 16); 2931 (STp->buffer)->b_data[10] = (ltmp >> 8); 2932 (STp->buffer)->b_data[11] = ltmp; 2933 timeout = STp->device->request_queue->rq_timeout; 2934 DEBC( 2935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2936 st_printk(ST_DEB_MSG, STp, 2937 "Setting block size to %d bytes.\n", 2938 (STp->buffer)->b_data[9] * 65536 + 2939 (STp->buffer)->b_data[10] * 256 + 2940 (STp->buffer)->b_data[11]); 2941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2942 st_printk(ST_DEB_MSG, STp, 2943 "Setting density code to %x.\n", 2944 (STp->buffer)->b_data[4]); 2945 if (cmd_in == MTSETDRVBUFFER) 2946 st_printk(ST_DEB_MSG, STp, 2947 "Setting drive buffer code to %d.\n", 2948 ((STp->buffer)->b_data[2] >> 4) & 7); 2949 ) 2950 break; 2951 default: 2952 return (-ENOSYS); 2953 } 2954 2955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2956 timeout, MAX_RETRIES, 1); 2957 if (!SRpnt) 2958 return (STp->buffer)->syscall_result; 2959 2960 ioctl_result = (STp->buffer)->syscall_result; 2961 2962 if (!ioctl_result) { /* SCSI command successful */ 2963 st_release_request(SRpnt); 2964 SRpnt = NULL; 2965 STps->drv_block = blkno; 2966 STps->drv_file = fileno; 2967 STps->at_sm = at_sm; 2968 2969 if (cmd_in == MTBSFM) 2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2971 else if (cmd_in == MTFSFM) 2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2973 2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2975 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2976 if (STp->block_size != 0) { 2977 (STp->buffer)->buffer_blocks = 2978 (STp->buffer)->buffer_size / STp->block_size; 2979 } 2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2981 if (cmd_in == SET_DENS_AND_BLK) 2982 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2983 } else if (cmd_in == MTSETDRVBUFFER) 2984 STp->drv_buffer = (arg & 7); 2985 else if (cmd_in == MTSETDENSITY) 2986 STp->density = arg; 2987 2988 if (cmd_in == MTEOM) 2989 STps->eof = ST_EOD; 2990 else if (cmd_in == MTFSF) 2991 STps->eof = ST_FM; 2992 else if (chg_eof) 2993 STps->eof = ST_NOEOF; 2994 2995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 2997 } else { /* SCSI command was not completely successful. Don't return 2998 from this block without releasing the SCSI command block! */ 2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3000 3001 if (cmdstatp->flags & SENSE_EOM) { 3002 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3003 cmd_in != MTBSR && cmd_in != MTBSS) 3004 STps->eof = ST_EOM_OK; 3005 STps->drv_block = 0; 3006 } 3007 3008 if (cmdstatp->remainder_valid) 3009 undone = (int)cmdstatp->uremainder64; 3010 else 3011 undone = 0; 3012 3013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3014 cmdstatp->have_sense && 3015 (cmdstatp->flags & SENSE_EOM)) { 3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3019 STps->eof = ST_NOEOF; 3020 } else { /* Writing EOF(s) failed */ 3021 if (fileno >= 0) 3022 fileno -= undone; 3023 if (undone < arg) 3024 STps->eof = ST_NOEOF; 3025 } 3026 STps->drv_file = fileno; 3027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3028 if (fileno >= 0) 3029 STps->drv_file = fileno - undone; 3030 else 3031 STps->drv_file = fileno; 3032 STps->drv_block = -1; 3033 STps->eof = ST_NOEOF; 3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3036 undone = (-undone); 3037 if (STps->drv_file >= 0) 3038 STps->drv_file = fileno + undone; 3039 STps->drv_block = 0; 3040 STps->eof = ST_NOEOF; 3041 } else if (cmd_in == MTFSR) { 3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3043 if (STps->drv_file >= 0) 3044 STps->drv_file++; 3045 STps->drv_block = 0; 3046 STps->eof = ST_FM; 3047 } else { 3048 if (blkno >= undone) 3049 STps->drv_block = blkno - undone; 3050 else 3051 STps->drv_block = (-1); 3052 STps->eof = ST_NOEOF; 3053 } 3054 } else if (cmd_in == MTBSR) { 3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3056 STps->drv_file--; 3057 STps->drv_block = (-1); 3058 } else { 3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3060 undone = (-undone); 3061 if (STps->drv_block >= 0) 3062 STps->drv_block = blkno + undone; 3063 } 3064 STps->eof = ST_NOEOF; 3065 } else if (cmd_in == MTEOM) { 3066 STps->drv_file = (-1); 3067 STps->drv_block = (-1); 3068 STps->eof = ST_EOD; 3069 } else if (cmd_in == MTSETBLK || 3070 cmd_in == MTSETDENSITY || 3071 cmd_in == MTSETDRVBUFFER || 3072 cmd_in == SET_DENS_AND_BLK) { 3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3074 !(STp->use_pf & PF_TESTED)) { 3075 /* Try the other possible state of Page Format if not 3076 already tried */ 3077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3078 st_release_request(SRpnt); 3079 SRpnt = NULL; 3080 return st_int_ioctl(STp, cmd_in, arg); 3081 } 3082 } else if (chg_eof) 3083 STps->eof = ST_NOEOF; 3084 3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3086 STps->eof = ST_EOD; 3087 3088 st_release_request(SRpnt); 3089 SRpnt = NULL; 3090 } 3091 3092 return ioctl_result; 3093 } 3094 3095 3096 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3097 structure. */ 3098 3099 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3100 int logical) 3101 { 3102 int result; 3103 unsigned char scmd[MAX_COMMAND_SIZE]; 3104 struct st_request *SRpnt; 3105 3106 if (STp->ready != ST_READY) 3107 return (-EIO); 3108 3109 memset(scmd, 0, MAX_COMMAND_SIZE); 3110 if ((STp->device)->scsi_level < SCSI_2) { 3111 scmd[0] = QFA_REQUEST_BLOCK; 3112 scmd[4] = 3; 3113 } else { 3114 scmd[0] = READ_POSITION; 3115 if (!logical && !STp->scsi2_logical) 3116 scmd[1] = 1; 3117 } 3118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3119 STp->device->request_queue->rq_timeout, 3120 MAX_READY_RETRIES, 1); 3121 if (!SRpnt) 3122 return (STp->buffer)->syscall_result; 3123 3124 if ((STp->buffer)->syscall_result != 0 || 3125 (STp->device->scsi_level >= SCSI_2 && 3126 ((STp->buffer)->b_data[0] & 4) != 0)) { 3127 *block = *partition = 0; 3128 DEBC_printk(STp, " Can't read tape position.\n"); 3129 result = (-EIO); 3130 } else { 3131 result = 0; 3132 if ((STp->device)->scsi_level < SCSI_2) { 3133 *block = ((STp->buffer)->b_data[0] << 16) 3134 + ((STp->buffer)->b_data[1] << 8) 3135 + (STp->buffer)->b_data[2]; 3136 *partition = 0; 3137 } else { 3138 *block = ((STp->buffer)->b_data[4] << 24) 3139 + ((STp->buffer)->b_data[5] << 16) 3140 + ((STp->buffer)->b_data[6] << 8) 3141 + (STp->buffer)->b_data[7]; 3142 *partition = (STp->buffer)->b_data[1]; 3143 if (((STp->buffer)->b_data[0] & 0x80) && 3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3146 } 3147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3148 *block, *partition); 3149 } 3150 st_release_request(SRpnt); 3151 SRpnt = NULL; 3152 3153 return result; 3154 } 3155 3156 3157 /* Set the tape block and partition. Negative partition means that only the 3158 block should be set in vendor specific way. */ 3159 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3160 int logical) 3161 { 3162 struct st_partstat *STps; 3163 int result, p; 3164 unsigned int blk; 3165 int timeout; 3166 unsigned char scmd[MAX_COMMAND_SIZE]; 3167 struct st_request *SRpnt; 3168 3169 if (STp->ready != ST_READY) 3170 return (-EIO); 3171 timeout = STp->long_timeout; 3172 STps = &(STp->ps[STp->partition]); 3173 3174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3175 block, partition); 3176 DEB(if (partition < 0) 3177 return (-EIO); ) 3178 3179 /* Update the location at the partition we are leaving */ 3180 if ((!STp->can_partitions && partition != 0) || 3181 partition >= ST_NBR_PARTITIONS) 3182 return (-EINVAL); 3183 if (partition != STp->partition) { 3184 if (get_location(STp, &blk, &p, 1)) 3185 STps->last_block_valid = 0; 3186 else { 3187 STps->last_block_valid = 1; 3188 STps->last_block_visited = blk; 3189 DEBC_printk(STp, "Visited block %d for " 3190 "partition %d saved.\n", 3191 blk, STp->partition); 3192 } 3193 } 3194 3195 memset(scmd, 0, MAX_COMMAND_SIZE); 3196 if ((STp->device)->scsi_level < SCSI_2) { 3197 scmd[0] = QFA_SEEK_BLOCK; 3198 scmd[2] = (block >> 16); 3199 scmd[3] = (block >> 8); 3200 scmd[4] = block; 3201 scmd[5] = 0; 3202 } else { 3203 scmd[0] = SEEK_10; 3204 scmd[3] = (block >> 24); 3205 scmd[4] = (block >> 16); 3206 scmd[5] = (block >> 8); 3207 scmd[6] = block; 3208 if (!logical && !STp->scsi2_logical) 3209 scmd[1] = 4; 3210 if (STp->partition != partition) { 3211 scmd[1] |= 2; 3212 scmd[8] = partition; 3213 DEBC_printk(STp, "Trying to change partition " 3214 "from %d to %d\n", STp->partition, 3215 partition); 3216 } 3217 } 3218 if (STp->immediate) { 3219 scmd[1] |= 1; /* Don't wait for completion */ 3220 timeout = STp->device->request_queue->rq_timeout; 3221 } 3222 3223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3224 timeout, MAX_READY_RETRIES, 1); 3225 if (!SRpnt) 3226 return (STp->buffer)->syscall_result; 3227 3228 STps->drv_block = STps->drv_file = (-1); 3229 STps->eof = ST_NOEOF; 3230 if ((STp->buffer)->syscall_result != 0) { 3231 result = (-EIO); 3232 if (STp->can_partitions && 3233 (STp->device)->scsi_level >= SCSI_2 && 3234 (p = find_partition(STp)) >= 0) 3235 STp->partition = p; 3236 } else { 3237 if (STp->can_partitions) { 3238 STp->partition = partition; 3239 STps = &(STp->ps[partition]); 3240 if (!STps->last_block_valid || 3241 STps->last_block_visited != block) { 3242 STps->at_sm = 0; 3243 STps->rw = ST_IDLE; 3244 } 3245 } else 3246 STps->at_sm = 0; 3247 if (block == 0) 3248 STps->drv_block = STps->drv_file = 0; 3249 result = 0; 3250 } 3251 3252 st_release_request(SRpnt); 3253 SRpnt = NULL; 3254 3255 return result; 3256 } 3257 3258 3259 /* Find the current partition number for the drive status. Called from open and 3260 returns either partition number of negative error code. */ 3261 static int find_partition(struct scsi_tape *STp) 3262 { 3263 int i, partition; 3264 unsigned int block; 3265 3266 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3267 return i; 3268 if (partition >= ST_NBR_PARTITIONS) 3269 return (-EIO); 3270 return partition; 3271 } 3272 3273 3274 /* Change the partition if necessary */ 3275 static int switch_partition(struct scsi_tape *STp) 3276 { 3277 struct st_partstat *STps; 3278 3279 if (STp->partition == STp->new_partition) 3280 return 0; 3281 STps = &(STp->ps[STp->new_partition]); 3282 if (!STps->last_block_valid) 3283 STps->last_block_visited = 0; 3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3285 } 3286 3287 /* Functions for reading and writing the medium partition mode page. */ 3288 3289 #define PART_PAGE 0x11 3290 #define PART_PAGE_FIXED_LENGTH 8 3291 3292 #define PP_OFF_MAX_ADD_PARTS 2 3293 #define PP_OFF_NBR_ADD_PARTS 3 3294 #define PP_OFF_FLAGS 4 3295 #define PP_OFF_PART_UNITS 6 3296 #define PP_OFF_RESERVED 7 3297 3298 #define PP_BIT_IDP 0x20 3299 #define PP_MSK_PSUM_MB 0x10 3300 3301 /* Get the number of partitions on the tape. As a side effect reads the 3302 mode page into the tape buffer. */ 3303 static int nbr_partitions(struct scsi_tape *STp) 3304 { 3305 int result; 3306 3307 if (STp->ready != ST_READY) 3308 return (-EIO); 3309 3310 result = read_mode_page(STp, PART_PAGE, 1); 3311 3312 if (result) { 3313 DEBC_printk(STp, "Can't read medium partition page.\n"); 3314 result = (-EIO); 3315 } else { 3316 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3317 PP_OFF_NBR_ADD_PARTS] + 1; 3318 DEBC_printk(STp, "Number of partitions %d.\n", result); 3319 } 3320 3321 return result; 3322 } 3323 3324 3325 /* Partition the tape into two partitions if size > 0 or one partition if 3326 size == 0. 3327 3328 The block descriptors are read and written because Sony SDT-7000 does not 3329 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3330 3331 My HP C1533A drive returns only one partition size field. This is used to 3332 set the size of partition 1. There is no size field for the default partition. 3333 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3334 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3335 The following algorithm is used to accommodate both drives: if the number of 3336 partition size fields is greater than the maximum number of additional partitions 3337 in the mode page, the second field is used. Otherwise the first field is used. 3338 3339 For Seagate DDS drives the page length must be 8 when no partitions is defined 3340 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3341 is acceptable also to some other old drives and enforced if the first partition 3342 size field is used for the first additional partition size. 3343 */ 3344 static int partition_tape(struct scsi_tape *STp, int size) 3345 { 3346 int result; 3347 int pgo, psd_cnt, psdo; 3348 unsigned char *bp; 3349 3350 result = read_mode_page(STp, PART_PAGE, 0); 3351 if (result) { 3352 DEBC_printk(STp, "Can't read partition mode page.\n"); 3353 return result; 3354 } 3355 /* The mode page is in the buffer. Let's modify it and write it. */ 3356 bp = (STp->buffer)->b_data; 3357 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3358 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3359 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3360 3361 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3362 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3363 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { 3364 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ 3365 psdo += 2; 3366 } 3367 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3368 3369 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3370 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3371 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3372 3373 if (size <= 0) { 3374 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3375 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3376 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3377 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3378 } else { 3379 bp[psdo] = (size >> 8) & 0xff; 3380 bp[psdo + 1] = size & 0xff; 3381 bp[pgo + 3] = 1; 3382 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3383 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3384 DEBC_printk(STp, "Formatting tape with two partitions " 3385 "(1 = %d MB).\n", size); 3386 } 3387 bp[pgo + PP_OFF_PART_UNITS] = 0; 3388 bp[pgo + PP_OFF_RESERVED] = 0; 3389 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; 3390 3391 result = write_mode_page(STp, PART_PAGE, 1); 3392 if (result) { 3393 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3394 result = (-EIO); 3395 } 3396 3397 return result; 3398 } 3399 3400 3401 3402 /* The ioctl command */ 3403 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3404 { 3405 int i, cmd_nr, cmd_type, bt; 3406 int retval = 0; 3407 unsigned int blk; 3408 struct scsi_tape *STp = file->private_data; 3409 struct st_modedef *STm; 3410 struct st_partstat *STps; 3411 void __user *p = (void __user *)arg; 3412 3413 if (mutex_lock_interruptible(&STp->lock)) 3414 return -ERESTARTSYS; 3415 3416 DEB( 3417 if (debugging && !STp->in_use) { 3418 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3419 retval = (-EIO); 3420 goto out; 3421 } ) /* end DEB */ 3422 3423 STm = &(STp->modes[STp->current_mode]); 3424 STps = &(STp->ps[STp->partition]); 3425 3426 /* 3427 * If we are in the middle of error recovery, don't let anyone 3428 * else try and use this device. Also, if error recovery fails, it 3429 * may try and take the device offline, in which case all further 3430 * access to the device is prohibited. 3431 */ 3432 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3433 file->f_flags & O_NDELAY); 3434 if (retval) 3435 goto out; 3436 3437 cmd_type = _IOC_TYPE(cmd_in); 3438 cmd_nr = _IOC_NR(cmd_in); 3439 3440 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3441 struct mtop mtc; 3442 3443 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3444 retval = (-EINVAL); 3445 goto out; 3446 } 3447 3448 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3449 if (i) { 3450 retval = (-EFAULT); 3451 goto out; 3452 } 3453 3454 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3455 st_printk(KERN_WARNING, STp, 3456 "MTSETDRVBUFFER only allowed for root.\n"); 3457 retval = (-EPERM); 3458 goto out; 3459 } 3460 if (!STm->defined && 3461 (mtc.mt_op != MTSETDRVBUFFER && 3462 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3463 retval = (-ENXIO); 3464 goto out; 3465 } 3466 3467 if (!STp->pos_unknown) { 3468 3469 if (STps->eof == ST_FM_HIT) { 3470 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3471 mtc.mt_op == MTEOM) { 3472 mtc.mt_count -= 1; 3473 if (STps->drv_file >= 0) 3474 STps->drv_file += 1; 3475 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3476 mtc.mt_count += 1; 3477 if (STps->drv_file >= 0) 3478 STps->drv_file += 1; 3479 } 3480 } 3481 3482 if (mtc.mt_op == MTSEEK) { 3483 /* Old position must be restored if partition will be 3484 changed */ 3485 i = !STp->can_partitions || 3486 (STp->new_partition != STp->partition); 3487 } else { 3488 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3489 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3490 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3491 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3492 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3493 mtc.mt_op == MTCOMPRESSION; 3494 } 3495 i = flush_buffer(STp, i); 3496 if (i < 0) { 3497 retval = i; 3498 goto out; 3499 } 3500 if (STps->rw == ST_WRITING && 3501 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3502 mtc.mt_op == MTSEEK || 3503 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3504 i = st_int_ioctl(STp, MTWEOF, 1); 3505 if (i < 0) { 3506 retval = i; 3507 goto out; 3508 } 3509 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3510 mtc.mt_count++; 3511 STps->rw = ST_IDLE; 3512 } 3513 3514 } else { 3515 /* 3516 * If there was a bus reset, block further access 3517 * to this device. If the user wants to rewind the tape, 3518 * then reset the flag and allow access again. 3519 */ 3520 if (mtc.mt_op != MTREW && 3521 mtc.mt_op != MTOFFL && 3522 mtc.mt_op != MTRETEN && 3523 mtc.mt_op != MTERASE && 3524 mtc.mt_op != MTSEEK && 3525 mtc.mt_op != MTEOM) { 3526 retval = (-EIO); 3527 goto out; 3528 } 3529 reset_state(STp); 3530 /* remove this when the midlevel properly clears was_reset */ 3531 STp->device->was_reset = 0; 3532 } 3533 3534 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3535 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3536 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3537 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3538 3539 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3540 do_door_lock(STp, 0); /* Ignore result! */ 3541 3542 if (mtc.mt_op == MTSETDRVBUFFER && 3543 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3544 retval = st_set_options(STp, mtc.mt_count); 3545 goto out; 3546 } 3547 3548 if (mtc.mt_op == MTSETPART) { 3549 if (!STp->can_partitions || 3550 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3551 retval = (-EINVAL); 3552 goto out; 3553 } 3554 if (mtc.mt_count >= STp->nbr_partitions && 3555 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3556 retval = (-EIO); 3557 goto out; 3558 } 3559 if (mtc.mt_count >= STp->nbr_partitions) { 3560 retval = (-EINVAL); 3561 goto out; 3562 } 3563 STp->new_partition = mtc.mt_count; 3564 retval = 0; 3565 goto out; 3566 } 3567 3568 if (mtc.mt_op == MTMKPART) { 3569 if (!STp->can_partitions) { 3570 retval = (-EINVAL); 3571 goto out; 3572 } 3573 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || 3574 (i = partition_tape(STp, mtc.mt_count)) < 0) { 3575 retval = i; 3576 goto out; 3577 } 3578 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3579 STp->ps[i].rw = ST_IDLE; 3580 STp->ps[i].at_sm = 0; 3581 STp->ps[i].last_block_valid = 0; 3582 } 3583 STp->partition = STp->new_partition = 0; 3584 STp->nbr_partitions = 1; /* Bad guess ?-) */ 3585 STps->drv_block = STps->drv_file = 0; 3586 retval = 0; 3587 goto out; 3588 } 3589 3590 if (mtc.mt_op == MTSEEK) { 3591 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3592 if (!STp->can_partitions) 3593 STp->ps[0].rw = ST_IDLE; 3594 retval = i; 3595 goto out; 3596 } 3597 3598 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3599 retval = do_load_unload(STp, file, 0); 3600 goto out; 3601 } 3602 3603 if (mtc.mt_op == MTLOAD) { 3604 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3605 goto out; 3606 } 3607 3608 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3609 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3610 goto out; 3611 } 3612 3613 if (STp->can_partitions && STp->ready == ST_READY && 3614 (i = switch_partition(STp)) < 0) { 3615 retval = i; 3616 goto out; 3617 } 3618 3619 if (mtc.mt_op == MTCOMPRESSION) 3620 retval = st_compression(STp, (mtc.mt_count & 1)); 3621 else 3622 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3623 goto out; 3624 } 3625 if (!STm->defined) { 3626 retval = (-ENXIO); 3627 goto out; 3628 } 3629 3630 if ((i = flush_buffer(STp, 0)) < 0) { 3631 retval = i; 3632 goto out; 3633 } 3634 if (STp->can_partitions && 3635 (i = switch_partition(STp)) < 0) { 3636 retval = i; 3637 goto out; 3638 } 3639 3640 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3641 struct mtget mt_status; 3642 3643 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3644 retval = (-EINVAL); 3645 goto out; 3646 } 3647 3648 mt_status.mt_type = STp->tape_type; 3649 mt_status.mt_dsreg = 3650 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3651 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3652 mt_status.mt_blkno = STps->drv_block; 3653 mt_status.mt_fileno = STps->drv_file; 3654 if (STp->block_size != 0) { 3655 if (STps->rw == ST_WRITING) 3656 mt_status.mt_blkno += 3657 (STp->buffer)->buffer_bytes / STp->block_size; 3658 else if (STps->rw == ST_READING) 3659 mt_status.mt_blkno -= 3660 ((STp->buffer)->buffer_bytes + 3661 STp->block_size - 1) / STp->block_size; 3662 } 3663 3664 mt_status.mt_gstat = 0; 3665 if (STp->drv_write_prot) 3666 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3667 if (mt_status.mt_blkno == 0) { 3668 if (mt_status.mt_fileno == 0) 3669 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3670 else 3671 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3672 } 3673 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3674 mt_status.mt_resid = STp->partition; 3675 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3676 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3677 else if (STps->eof >= ST_EOM_OK) 3678 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3679 if (STp->density == 1) 3680 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3681 else if (STp->density == 2) 3682 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3683 else if (STp->density == 3) 3684 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3685 if (STp->ready == ST_READY) 3686 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3687 if (STp->ready == ST_NO_TAPE) 3688 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3689 if (STps->at_sm) 3690 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3691 if (STm->do_async_writes || 3692 (STm->do_buffer_writes && STp->block_size != 0) || 3693 STp->drv_buffer != 0) 3694 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3695 if (STp->cleaning_req) 3696 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3697 3698 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3699 if (i) { 3700 retval = (-EFAULT); 3701 goto out; 3702 } 3703 3704 STp->recover_reg = 0; /* Clear after read */ 3705 retval = 0; 3706 goto out; 3707 } /* End of MTIOCGET */ 3708 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3709 struct mtpos mt_pos; 3710 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3711 retval = (-EINVAL); 3712 goto out; 3713 } 3714 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3715 retval = i; 3716 goto out; 3717 } 3718 mt_pos.mt_blkno = blk; 3719 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3720 if (i) 3721 retval = (-EFAULT); 3722 goto out; 3723 } 3724 mutex_unlock(&STp->lock); 3725 switch (cmd_in) { 3726 case SCSI_IOCTL_GET_IDLUN: 3727 case SCSI_IOCTL_GET_BUS_NUMBER: 3728 break; 3729 default: 3730 if ((cmd_in == SG_IO || 3731 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3732 cmd_in == CDROM_SEND_PACKET) && 3733 !capable(CAP_SYS_RAWIO)) 3734 i = -EPERM; 3735 else 3736 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3737 file->f_mode, cmd_in, p); 3738 if (i != -ENOTTY) 3739 return i; 3740 break; 3741 } 3742 retval = scsi_ioctl(STp->device, cmd_in, p); 3743 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3744 STp->rew_at_close = 0; 3745 STp->ready = ST_NO_TAPE; 3746 } 3747 return retval; 3748 3749 out: 3750 mutex_unlock(&STp->lock); 3751 return retval; 3752 } 3753 3754 #ifdef CONFIG_COMPAT 3755 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3756 { 3757 struct scsi_tape *STp = file->private_data; 3758 struct scsi_device *sdev = STp->device; 3759 int ret = -ENOIOCTLCMD; 3760 if (sdev->host->hostt->compat_ioctl) { 3761 3762 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3763 3764 } 3765 return ret; 3766 } 3767 #endif 3768 3769 3770 3771 /* Try to allocate a new tape buffer. Calling function must not hold 3772 dev_arr_lock. */ 3773 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3774 { 3775 struct st_buffer *tb; 3776 3777 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC); 3778 if (!tb) { 3779 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3780 return NULL; 3781 } 3782 tb->frp_segs = 0; 3783 tb->use_sg = max_sg; 3784 tb->dma = need_dma; 3785 tb->buffer_size = 0; 3786 3787 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), 3788 GFP_ATOMIC); 3789 if (!tb->reserved_pages) { 3790 kfree(tb); 3791 return NULL; 3792 } 3793 3794 return tb; 3795 } 3796 3797 3798 /* Try to allocate enough space in the tape buffer */ 3799 #define ST_MAX_ORDER 6 3800 3801 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3802 { 3803 int segs, max_segs, b_size, order, got; 3804 gfp_t priority; 3805 3806 if (new_size <= STbuffer->buffer_size) 3807 return 1; 3808 3809 if (STbuffer->buffer_size <= PAGE_SIZE) 3810 normalize_buffer(STbuffer); /* Avoid extra segment */ 3811 3812 max_segs = STbuffer->use_sg; 3813 3814 priority = GFP_KERNEL | __GFP_NOWARN; 3815 if (need_dma) 3816 priority |= GFP_DMA; 3817 3818 if (STbuffer->cleared) 3819 priority |= __GFP_ZERO; 3820 3821 if (STbuffer->frp_segs) { 3822 order = STbuffer->reserved_page_order; 3823 b_size = PAGE_SIZE << order; 3824 } else { 3825 for (b_size = PAGE_SIZE, order = 0; 3826 order < ST_MAX_ORDER && 3827 max_segs * (PAGE_SIZE << order) < new_size; 3828 order++, b_size *= 2) 3829 ; /* empty */ 3830 STbuffer->reserved_page_order = order; 3831 } 3832 if (max_segs * (PAGE_SIZE << order) < new_size) { 3833 if (order == ST_MAX_ORDER) 3834 return 0; 3835 normalize_buffer(STbuffer); 3836 return enlarge_buffer(STbuffer, new_size, need_dma); 3837 } 3838 3839 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3840 segs < max_segs && got < new_size;) { 3841 struct page *page; 3842 3843 page = alloc_pages(priority, order); 3844 if (!page) { 3845 DEB(STbuffer->buffer_size = got); 3846 normalize_buffer(STbuffer); 3847 return 0; 3848 } 3849 3850 STbuffer->frp_segs += 1; 3851 got += b_size; 3852 STbuffer->buffer_size = got; 3853 STbuffer->reserved_pages[segs] = page; 3854 segs++; 3855 } 3856 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3857 3858 return 1; 3859 } 3860 3861 3862 /* Make sure that no data from previous user is in the internal buffer */ 3863 static void clear_buffer(struct st_buffer * st_bp) 3864 { 3865 int i; 3866 3867 for (i=0; i < st_bp->frp_segs; i++) 3868 memset(page_address(st_bp->reserved_pages[i]), 0, 3869 PAGE_SIZE << st_bp->reserved_page_order); 3870 st_bp->cleared = 1; 3871 } 3872 3873 3874 /* Release the extra buffer */ 3875 static void normalize_buffer(struct st_buffer * STbuffer) 3876 { 3877 int i, order = STbuffer->reserved_page_order; 3878 3879 for (i = 0; i < STbuffer->frp_segs; i++) { 3880 __free_pages(STbuffer->reserved_pages[i], order); 3881 STbuffer->buffer_size -= (PAGE_SIZE << order); 3882 } 3883 STbuffer->frp_segs = 0; 3884 STbuffer->sg_segs = 0; 3885 STbuffer->reserved_page_order = 0; 3886 STbuffer->map_data.offset = 0; 3887 } 3888 3889 3890 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3891 negative error code. */ 3892 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3893 { 3894 int i, cnt, res, offset; 3895 int length = PAGE_SIZE << st_bp->reserved_page_order; 3896 3897 for (i = 0, offset = st_bp->buffer_bytes; 3898 i < st_bp->frp_segs && offset >= length; i++) 3899 offset -= length; 3900 if (i == st_bp->frp_segs) { /* Should never happen */ 3901 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 3902 return (-EIO); 3903 } 3904 for (; i < st_bp->frp_segs && do_count > 0; i++) { 3905 struct page *page = st_bp->reserved_pages[i]; 3906 cnt = length - offset < do_count ? length - offset : do_count; 3907 res = copy_from_user(page_address(page) + offset, ubp, cnt); 3908 if (res) 3909 return (-EFAULT); 3910 do_count -= cnt; 3911 st_bp->buffer_bytes += cnt; 3912 ubp += cnt; 3913 offset = 0; 3914 } 3915 if (do_count) /* Should never happen */ 3916 return (-EIO); 3917 3918 return 0; 3919 } 3920 3921 3922 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 3923 negative error code. */ 3924 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 3925 { 3926 int i, cnt, res, offset; 3927 int length = PAGE_SIZE << st_bp->reserved_page_order; 3928 3929 for (i = 0, offset = st_bp->read_pointer; 3930 i < st_bp->frp_segs && offset >= length; i++) 3931 offset -= length; 3932 if (i == st_bp->frp_segs) { /* Should never happen */ 3933 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 3934 return (-EIO); 3935 } 3936 for (; i < st_bp->frp_segs && do_count > 0; i++) { 3937 struct page *page = st_bp->reserved_pages[i]; 3938 cnt = length - offset < do_count ? length - offset : do_count; 3939 res = copy_to_user(ubp, page_address(page) + offset, cnt); 3940 if (res) 3941 return (-EFAULT); 3942 do_count -= cnt; 3943 st_bp->buffer_bytes -= cnt; 3944 st_bp->read_pointer += cnt; 3945 ubp += cnt; 3946 offset = 0; 3947 } 3948 if (do_count) /* Should never happen */ 3949 return (-EIO); 3950 3951 return 0; 3952 } 3953 3954 3955 /* Move data towards start of buffer */ 3956 static void move_buffer_data(struct st_buffer * st_bp, int offset) 3957 { 3958 int src_seg, dst_seg, src_offset = 0, dst_offset; 3959 int count, total; 3960 int length = PAGE_SIZE << st_bp->reserved_page_order; 3961 3962 if (offset == 0) 3963 return; 3964 3965 total=st_bp->buffer_bytes - offset; 3966 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 3967 src_offset = offset; 3968 if (src_offset < length) 3969 break; 3970 offset -= length; 3971 } 3972 3973 st_bp->buffer_bytes = st_bp->read_pointer = total; 3974 for (dst_seg=dst_offset=0; total > 0; ) { 3975 struct page *dpage = st_bp->reserved_pages[dst_seg]; 3976 struct page *spage = st_bp->reserved_pages[src_seg]; 3977 3978 count = min(length - dst_offset, length - src_offset); 3979 memmove(page_address(dpage) + dst_offset, 3980 page_address(spage) + src_offset, count); 3981 src_offset += count; 3982 if (src_offset >= length) { 3983 src_seg++; 3984 src_offset = 0; 3985 } 3986 dst_offset += count; 3987 if (dst_offset >= length) { 3988 dst_seg++; 3989 dst_offset = 0; 3990 } 3991 total -= count; 3992 } 3993 } 3994 3995 /* Validate the options from command line or module parameters */ 3996 static void validate_options(void) 3997 { 3998 if (buffer_kbs > 0) 3999 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4000 if (max_sg_segs >= ST_FIRST_SG) 4001 st_max_sg_segs = max_sg_segs; 4002 } 4003 4004 #ifndef MODULE 4005 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4006 */ 4007 static int __init st_setup(char *str) 4008 { 4009 int i, len, ints[5]; 4010 char *stp; 4011 4012 stp = get_options(str, ARRAY_SIZE(ints), ints); 4013 4014 if (ints[0] > 0) { 4015 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4016 if (parms[i].val) 4017 *parms[i].val = ints[i + 1]; 4018 } else { 4019 while (stp != NULL) { 4020 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4021 len = strlen(parms[i].name); 4022 if (!strncmp(stp, parms[i].name, len) && 4023 (*(stp + len) == ':' || *(stp + len) == '=')) { 4024 if (parms[i].val) 4025 *parms[i].val = 4026 simple_strtoul(stp + len + 1, NULL, 0); 4027 else 4028 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4029 parms[i].name); 4030 break; 4031 } 4032 } 4033 if (i >= ARRAY_SIZE(parms)) 4034 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4035 stp); 4036 stp = strchr(stp, ','); 4037 if (stp) 4038 stp++; 4039 } 4040 } 4041 4042 validate_options(); 4043 4044 return 1; 4045 } 4046 4047 __setup("st=", st_setup); 4048 4049 #endif 4050 4051 static const struct file_operations st_fops = 4052 { 4053 .owner = THIS_MODULE, 4054 .read = st_read, 4055 .write = st_write, 4056 .unlocked_ioctl = st_ioctl, 4057 #ifdef CONFIG_COMPAT 4058 .compat_ioctl = st_compat_ioctl, 4059 #endif 4060 .open = st_open, 4061 .flush = st_flush, 4062 .release = st_release, 4063 .llseek = noop_llseek, 4064 }; 4065 4066 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4067 { 4068 int i, error; 4069 dev_t cdev_devno; 4070 struct cdev *cdev; 4071 struct device *dev; 4072 struct st_modedef *STm = &(tape->modes[mode]); 4073 char name[10]; 4074 int dev_num = tape->index; 4075 4076 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4077 4078 cdev = cdev_alloc(); 4079 if (!cdev) { 4080 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4081 error = -ENOMEM; 4082 goto out; 4083 } 4084 cdev->owner = THIS_MODULE; 4085 cdev->ops = &st_fops; 4086 4087 error = cdev_add(cdev, cdev_devno, 1); 4088 if (error) { 4089 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4090 rew ? "non" : "auto", mode); 4091 pr_err("st%d: Device not attached.\n", dev_num); 4092 goto out_free; 4093 } 4094 STm->cdevs[rew] = cdev; 4095 4096 i = mode << (4 - ST_NBR_MODE_BITS); 4097 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4098 tape->disk->disk_name, st_formats[i]); 4099 4100 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4101 cdev_devno, &tape->modes[mode], "%s", name); 4102 if (IS_ERR(dev)) { 4103 pr_err("st%d: device_create failed\n", dev_num); 4104 error = PTR_ERR(dev); 4105 goto out_free; 4106 } 4107 4108 STm->devs[rew] = dev; 4109 4110 return 0; 4111 out_free: 4112 cdev_del(STm->cdevs[rew]); 4113 STm->cdevs[rew] = NULL; 4114 out: 4115 return error; 4116 } 4117 4118 static int create_cdevs(struct scsi_tape *tape) 4119 { 4120 int mode, error; 4121 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4122 error = create_one_cdev(tape, mode, 0); 4123 if (error) 4124 return error; 4125 error = create_one_cdev(tape, mode, 1); 4126 if (error) 4127 return error; 4128 } 4129 4130 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4131 &tape->modes[0].devs[0]->kobj, "tape"); 4132 } 4133 4134 static void remove_cdevs(struct scsi_tape *tape) 4135 { 4136 int mode, rew; 4137 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4138 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4139 struct st_modedef *STm = &(tape->modes[mode]); 4140 for (rew = 0; rew < 2; rew++) { 4141 if (STm->cdevs[rew]) 4142 cdev_del(STm->cdevs[rew]); 4143 if (STm->devs[rew]) 4144 device_unregister(STm->devs[rew]); 4145 } 4146 } 4147 } 4148 4149 static int st_probe(struct device *dev) 4150 { 4151 struct scsi_device *SDp = to_scsi_device(dev); 4152 struct gendisk *disk = NULL; 4153 struct scsi_tape *tpnt = NULL; 4154 struct st_modedef *STm; 4155 struct st_partstat *STps; 4156 struct st_buffer *buffer; 4157 int i, error; 4158 char *stp; 4159 4160 if (SDp->type != TYPE_TAPE) 4161 return -ENODEV; 4162 if ((stp = st_incompatible(SDp))) { 4163 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4164 sdev_printk(KERN_INFO, SDp, 4165 "st: The suggested driver is %s.\n", stp); 4166 return -ENODEV; 4167 } 4168 4169 scsi_autopm_get_device(SDp); 4170 i = queue_max_segments(SDp->request_queue); 4171 if (st_max_sg_segs < i) 4172 i = st_max_sg_segs; 4173 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4174 if (buffer == NULL) { 4175 sdev_printk(KERN_ERR, SDp, 4176 "st: Can't allocate new tape buffer. " 4177 "Device not attached.\n"); 4178 goto out; 4179 } 4180 4181 disk = alloc_disk(1); 4182 if (!disk) { 4183 sdev_printk(KERN_ERR, SDp, 4184 "st: out of memory. Device not attached.\n"); 4185 goto out_buffer_free; 4186 } 4187 4188 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC); 4189 if (tpnt == NULL) { 4190 sdev_printk(KERN_ERR, SDp, 4191 "st: Can't allocate device descriptor.\n"); 4192 goto out_put_disk; 4193 } 4194 kref_init(&tpnt->kref); 4195 tpnt->disk = disk; 4196 disk->private_data = &tpnt->driver; 4197 disk->queue = SDp->request_queue; 4198 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4199 * take queue reference that release_disk() expects. */ 4200 if (!blk_get_queue(disk->queue)) 4201 goto out_put_disk; 4202 tpnt->driver = &st_template; 4203 4204 tpnt->device = SDp; 4205 if (SDp->scsi_level <= 2) 4206 tpnt->tape_type = MT_ISSCSI1; 4207 else 4208 tpnt->tape_type = MT_ISSCSI2; 4209 4210 tpnt->buffer = buffer; 4211 tpnt->buffer->last_SRpnt = NULL; 4212 4213 tpnt->inited = 0; 4214 tpnt->dirty = 0; 4215 tpnt->in_use = 0; 4216 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4217 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4218 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4219 tpnt->density = 0; 4220 tpnt->do_auto_lock = ST_AUTO_LOCK; 4221 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4222 tpnt->can_partitions = 0; 4223 tpnt->two_fm = ST_TWO_FM; 4224 tpnt->fast_mteom = ST_FAST_MTEOM; 4225 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4226 tpnt->sili = ST_SILI; 4227 tpnt->immediate = ST_NOWAIT; 4228 tpnt->immediate_filemark = 0; 4229 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4230 tpnt->partition = 0; 4231 tpnt->new_partition = 0; 4232 tpnt->nbr_partitions = 0; 4233 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4234 tpnt->long_timeout = ST_LONG_TIMEOUT; 4235 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4236 4237 for (i = 0; i < ST_NBR_MODES; i++) { 4238 STm = &(tpnt->modes[i]); 4239 STm->defined = 0; 4240 STm->sysv = ST_SYSV; 4241 STm->defaults_for_writes = 0; 4242 STm->do_async_writes = ST_ASYNC_WRITES; 4243 STm->do_buffer_writes = ST_BUFFER_WRITES; 4244 STm->do_read_ahead = ST_READ_AHEAD; 4245 STm->default_compression = ST_DONT_TOUCH; 4246 STm->default_blksize = (-1); /* No forced size */ 4247 STm->default_density = (-1); /* No forced density */ 4248 STm->tape = tpnt; 4249 } 4250 4251 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4252 STps = &(tpnt->ps[i]); 4253 STps->rw = ST_IDLE; 4254 STps->eof = ST_NOEOF; 4255 STps->at_sm = 0; 4256 STps->last_block_valid = 0; 4257 STps->drv_block = (-1); 4258 STps->drv_file = (-1); 4259 } 4260 4261 tpnt->current_mode = 0; 4262 tpnt->modes[0].defined = 1; 4263 4264 tpnt->density_changed = tpnt->compression_changed = 4265 tpnt->blksize_changed = 0; 4266 mutex_init(&tpnt->lock); 4267 4268 idr_preload(GFP_KERNEL); 4269 spin_lock(&st_index_lock); 4270 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4271 spin_unlock(&st_index_lock); 4272 idr_preload_end(); 4273 if (error < 0) { 4274 pr_warn("st: idr allocation failed: %d\n", error); 4275 goto out_put_queue; 4276 } 4277 tpnt->index = error; 4278 sprintf(disk->disk_name, "st%d", tpnt->index); 4279 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4280 if (tpnt->stats == NULL) { 4281 sdev_printk(KERN_ERR, SDp, 4282 "st: Can't allocate statistics.\n"); 4283 goto out_idr_remove; 4284 } 4285 4286 dev_set_drvdata(dev, tpnt); 4287 4288 4289 error = create_cdevs(tpnt); 4290 if (error) 4291 goto out_remove_devs; 4292 scsi_autopm_put_device(SDp); 4293 4294 sdev_printk(KERN_NOTICE, SDp, 4295 "Attached scsi tape %s\n", tape_name(tpnt)); 4296 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4297 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4298 queue_dma_alignment(SDp->request_queue) + 1); 4299 4300 return 0; 4301 4302 out_remove_devs: 4303 remove_cdevs(tpnt); 4304 kfree(tpnt->stats); 4305 out_idr_remove: 4306 spin_lock(&st_index_lock); 4307 idr_remove(&st_index_idr, tpnt->index); 4308 spin_unlock(&st_index_lock); 4309 out_put_queue: 4310 blk_put_queue(disk->queue); 4311 out_put_disk: 4312 put_disk(disk); 4313 kfree(tpnt); 4314 out_buffer_free: 4315 kfree(buffer); 4316 out: 4317 scsi_autopm_put_device(SDp); 4318 return -ENODEV; 4319 }; 4320 4321 4322 static int st_remove(struct device *dev) 4323 { 4324 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4325 int index = tpnt->index; 4326 4327 scsi_autopm_get_device(to_scsi_device(dev)); 4328 remove_cdevs(tpnt); 4329 4330 mutex_lock(&st_ref_mutex); 4331 kref_put(&tpnt->kref, scsi_tape_release); 4332 mutex_unlock(&st_ref_mutex); 4333 spin_lock(&st_index_lock); 4334 idr_remove(&st_index_idr, index); 4335 spin_unlock(&st_index_lock); 4336 return 0; 4337 } 4338 4339 /** 4340 * scsi_tape_release - Called to free the Scsi_Tape structure 4341 * @kref: pointer to embedded kref 4342 * 4343 * st_ref_mutex must be held entering this routine. Because it is 4344 * called on last put, you should always use the scsi_tape_get() 4345 * scsi_tape_put() helpers which manipulate the semaphore directly 4346 * and never do a direct kref_put(). 4347 **/ 4348 static void scsi_tape_release(struct kref *kref) 4349 { 4350 struct scsi_tape *tpnt = to_scsi_tape(kref); 4351 struct gendisk *disk = tpnt->disk; 4352 4353 tpnt->device = NULL; 4354 4355 if (tpnt->buffer) { 4356 normalize_buffer(tpnt->buffer); 4357 kfree(tpnt->buffer->reserved_pages); 4358 kfree(tpnt->buffer); 4359 } 4360 4361 disk->private_data = NULL; 4362 put_disk(disk); 4363 kfree(tpnt->stats); 4364 kfree(tpnt); 4365 return; 4366 } 4367 4368 static struct class st_sysfs_class = { 4369 .name = "scsi_tape", 4370 .dev_groups = st_dev_groups, 4371 }; 4372 4373 static int __init init_st(void) 4374 { 4375 int err; 4376 4377 validate_options(); 4378 4379 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4380 verstr, st_fixed_buffer_size, st_max_sg_segs); 4381 4382 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4383 if (debugging) { 4384 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4385 debugging); 4386 } 4387 4388 err = class_register(&st_sysfs_class); 4389 if (err) { 4390 pr_err("Unable register sysfs class for SCSI tapes\n"); 4391 return err; 4392 } 4393 4394 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4395 ST_MAX_TAPE_ENTRIES, "st"); 4396 if (err) { 4397 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4398 SCSI_TAPE_MAJOR); 4399 goto err_class; 4400 } 4401 4402 err = scsi_register_driver(&st_template.gendrv); 4403 if (err) 4404 goto err_chrdev; 4405 4406 return 0; 4407 4408 err_chrdev: 4409 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4410 ST_MAX_TAPE_ENTRIES); 4411 err_class: 4412 class_unregister(&st_sysfs_class); 4413 return err; 4414 } 4415 4416 static void __exit exit_st(void) 4417 { 4418 scsi_unregister_driver(&st_template.gendrv); 4419 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4420 ST_MAX_TAPE_ENTRIES); 4421 class_unregister(&st_sysfs_class); 4422 idr_destroy(&st_index_idr); 4423 printk(KERN_INFO "st: Unloaded.\n"); 4424 } 4425 4426 module_init(init_st); 4427 module_exit(exit_st); 4428 4429 4430 /* The sysfs driver interface. Read-only at the moment */ 4431 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4432 { 4433 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4434 } 4435 static DRIVER_ATTR_RO(try_direct_io); 4436 4437 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4438 { 4439 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4440 } 4441 static DRIVER_ATTR_RO(fixed_buffer_size); 4442 4443 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4444 { 4445 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4446 } 4447 static DRIVER_ATTR_RO(max_sg_segs); 4448 4449 static ssize_t version_show(struct device_driver *ddd, char *buf) 4450 { 4451 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4452 } 4453 static DRIVER_ATTR_RO(version); 4454 4455 static struct attribute *st_drv_attrs[] = { 4456 &driver_attr_try_direct_io.attr, 4457 &driver_attr_fixed_buffer_size.attr, 4458 &driver_attr_max_sg_segs.attr, 4459 &driver_attr_version.attr, 4460 NULL, 4461 }; 4462 ATTRIBUTE_GROUPS(st_drv); 4463 4464 /* The sysfs simple class interface */ 4465 static ssize_t 4466 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4467 { 4468 struct st_modedef *STm = dev_get_drvdata(dev); 4469 ssize_t l = 0; 4470 4471 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4472 return l; 4473 } 4474 static DEVICE_ATTR_RO(defined); 4475 4476 static ssize_t 4477 default_blksize_show(struct device *dev, struct device_attribute *attr, 4478 char *buf) 4479 { 4480 struct st_modedef *STm = dev_get_drvdata(dev); 4481 ssize_t l = 0; 4482 4483 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4484 return l; 4485 } 4486 static DEVICE_ATTR_RO(default_blksize); 4487 4488 static ssize_t 4489 default_density_show(struct device *dev, struct device_attribute *attr, 4490 char *buf) 4491 { 4492 struct st_modedef *STm = dev_get_drvdata(dev); 4493 ssize_t l = 0; 4494 char *fmt; 4495 4496 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4497 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4498 return l; 4499 } 4500 static DEVICE_ATTR_RO(default_density); 4501 4502 static ssize_t 4503 default_compression_show(struct device *dev, struct device_attribute *attr, 4504 char *buf) 4505 { 4506 struct st_modedef *STm = dev_get_drvdata(dev); 4507 ssize_t l = 0; 4508 4509 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4510 return l; 4511 } 4512 static DEVICE_ATTR_RO(default_compression); 4513 4514 static ssize_t 4515 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4516 { 4517 struct st_modedef *STm = dev_get_drvdata(dev); 4518 struct scsi_tape *STp = STm->tape; 4519 int options; 4520 ssize_t l = 0; 4521 4522 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4523 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4524 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4525 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4526 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4527 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4528 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4529 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4530 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4531 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4532 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4533 options |= STm->sysv ? MT_ST_SYSV : 0; 4534 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4535 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4536 options |= STp->sili ? MT_ST_SILI : 0; 4537 4538 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4539 return l; 4540 } 4541 static DEVICE_ATTR_RO(options); 4542 4543 /* Support for tape stats */ 4544 4545 /** 4546 * read_cnt_show - return read count - count of reads made from tape drive 4547 * @dev: struct device 4548 * @attr: attribute structure 4549 * @buf: buffer to return formatted data in 4550 */ 4551 static ssize_t read_cnt_show(struct device *dev, 4552 struct device_attribute *attr, char *buf) 4553 { 4554 struct st_modedef *STm = dev_get_drvdata(dev); 4555 4556 return sprintf(buf, "%lld", 4557 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4558 } 4559 static DEVICE_ATTR_RO(read_cnt); 4560 4561 /** 4562 * read_byte_cnt_show - return read byte count - tape drives 4563 * may use blocks less than 512 bytes this gives the raw byte count of 4564 * of data read from the tape drive. 4565 * @dev: struct device 4566 * @attr: attribute structure 4567 * @buf: buffer to return formatted data in 4568 */ 4569 static ssize_t read_byte_cnt_show(struct device *dev, 4570 struct device_attribute *attr, char *buf) 4571 { 4572 struct st_modedef *STm = dev_get_drvdata(dev); 4573 4574 return sprintf(buf, "%lld", 4575 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4576 } 4577 static DEVICE_ATTR_RO(read_byte_cnt); 4578 4579 /** 4580 * read_us_show - return read us - overall time spent waiting on reads in ns. 4581 * @dev: struct device 4582 * @attr: attribute structure 4583 * @buf: buffer to return formatted data in 4584 */ 4585 static ssize_t read_ns_show(struct device *dev, 4586 struct device_attribute *attr, char *buf) 4587 { 4588 struct st_modedef *STm = dev_get_drvdata(dev); 4589 4590 return sprintf(buf, "%lld", 4591 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4592 } 4593 static DEVICE_ATTR_RO(read_ns); 4594 4595 /** 4596 * write_cnt_show - write count - number of user calls 4597 * to write(2) that have written data to tape. 4598 * @dev: struct device 4599 * @attr: attribute structure 4600 * @buf: buffer to return formatted data in 4601 */ 4602 static ssize_t write_cnt_show(struct device *dev, 4603 struct device_attribute *attr, char *buf) 4604 { 4605 struct st_modedef *STm = dev_get_drvdata(dev); 4606 4607 return sprintf(buf, "%lld", 4608 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4609 } 4610 static DEVICE_ATTR_RO(write_cnt); 4611 4612 /** 4613 * write_byte_cnt_show - write byte count - raw count of 4614 * bytes written to tape. 4615 * @dev: struct device 4616 * @attr: attribute structure 4617 * @buf: buffer to return formatted data in 4618 */ 4619 static ssize_t write_byte_cnt_show(struct device *dev, 4620 struct device_attribute *attr, char *buf) 4621 { 4622 struct st_modedef *STm = dev_get_drvdata(dev); 4623 4624 return sprintf(buf, "%lld", 4625 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4626 } 4627 static DEVICE_ATTR_RO(write_byte_cnt); 4628 4629 /** 4630 * write_ns_show - write ns - number of nanoseconds waiting on write 4631 * requests to complete. 4632 * @dev: struct device 4633 * @attr: attribute structure 4634 * @buf: buffer to return formatted data in 4635 */ 4636 static ssize_t write_ns_show(struct device *dev, 4637 struct device_attribute *attr, char *buf) 4638 { 4639 struct st_modedef *STm = dev_get_drvdata(dev); 4640 4641 return sprintf(buf, "%lld", 4642 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4643 } 4644 static DEVICE_ATTR_RO(write_ns); 4645 4646 /** 4647 * in_flight_show - number of I/Os currently in flight - 4648 * in most cases this will be either 0 or 1. It may be higher if someone 4649 * has also issued other SCSI commands such as via an ioctl. 4650 * @dev: struct device 4651 * @attr: attribute structure 4652 * @buf: buffer to return formatted data in 4653 */ 4654 static ssize_t in_flight_show(struct device *dev, 4655 struct device_attribute *attr, char *buf) 4656 { 4657 struct st_modedef *STm = dev_get_drvdata(dev); 4658 4659 return sprintf(buf, "%lld", 4660 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4661 } 4662 static DEVICE_ATTR_RO(in_flight); 4663 4664 /** 4665 * io_ns_show - io wait ns - this is the number of ns spent 4666 * waiting on all I/O to complete. This includes tape movement commands 4667 * such as rewinding, seeking to end of file or tape, it also includes 4668 * read and write. To determine the time spent on tape movement 4669 * subtract the read and write ns from this value. 4670 * @dev: struct device 4671 * @attr: attribute structure 4672 * @buf: buffer to return formatted data in 4673 */ 4674 static ssize_t io_ns_show(struct device *dev, 4675 struct device_attribute *attr, char *buf) 4676 { 4677 struct st_modedef *STm = dev_get_drvdata(dev); 4678 4679 return sprintf(buf, "%lld", 4680 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4681 } 4682 static DEVICE_ATTR_RO(io_ns); 4683 4684 /** 4685 * other_cnt_show - other io count - this is the number of 4686 * I/O requests other than read and write requests. 4687 * Typically these are tape movement requests but will include driver 4688 * tape movement. This includes only requests issued by the st driver. 4689 * @dev: struct device 4690 * @attr: attribute structure 4691 * @buf: buffer to return formatted data in 4692 */ 4693 static ssize_t other_cnt_show(struct device *dev, 4694 struct device_attribute *attr, char *buf) 4695 { 4696 struct st_modedef *STm = dev_get_drvdata(dev); 4697 4698 return sprintf(buf, "%lld", 4699 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4700 } 4701 static DEVICE_ATTR_RO(other_cnt); 4702 4703 /** 4704 * resid_cnt_show - A count of the number of times we get a residual 4705 * count - this should indicate someone issuing reads larger than the 4706 * block size on tape. 4707 * @dev: struct device 4708 * @attr: attribute structure 4709 * @buf: buffer to return formatted data in 4710 */ 4711 static ssize_t resid_cnt_show(struct device *dev, 4712 struct device_attribute *attr, char *buf) 4713 { 4714 struct st_modedef *STm = dev_get_drvdata(dev); 4715 4716 return sprintf(buf, "%lld", 4717 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4718 } 4719 static DEVICE_ATTR_RO(resid_cnt); 4720 4721 static struct attribute *st_dev_attrs[] = { 4722 &dev_attr_defined.attr, 4723 &dev_attr_default_blksize.attr, 4724 &dev_attr_default_density.attr, 4725 &dev_attr_default_compression.attr, 4726 &dev_attr_options.attr, 4727 NULL, 4728 }; 4729 4730 static struct attribute *st_stats_attrs[] = { 4731 &dev_attr_read_cnt.attr, 4732 &dev_attr_read_byte_cnt.attr, 4733 &dev_attr_read_ns.attr, 4734 &dev_attr_write_cnt.attr, 4735 &dev_attr_write_byte_cnt.attr, 4736 &dev_attr_write_ns.attr, 4737 &dev_attr_in_flight.attr, 4738 &dev_attr_io_ns.attr, 4739 &dev_attr_other_cnt.attr, 4740 &dev_attr_resid_cnt.attr, 4741 NULL, 4742 }; 4743 4744 static struct attribute_group stats_group = { 4745 .name = "stats", 4746 .attrs = st_stats_attrs, 4747 }; 4748 4749 static struct attribute_group st_group = { 4750 .attrs = st_dev_attrs, 4751 }; 4752 4753 static const struct attribute_group *st_dev_groups[] = { 4754 &st_group, 4755 &stats_group, 4756 NULL, 4757 }; 4758 4759 /* The following functions may be useful for a larger audience. */ 4760 static int sgl_map_user_pages(struct st_buffer *STbp, 4761 const unsigned int max_pages, unsigned long uaddr, 4762 size_t count, int rw) 4763 { 4764 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4765 unsigned long start = uaddr >> PAGE_SHIFT; 4766 const int nr_pages = end - start; 4767 int res, i, j; 4768 struct page **pages; 4769 struct rq_map_data *mdata = &STbp->map_data; 4770 4771 /* User attempted Overflow! */ 4772 if ((uaddr + count) < uaddr) 4773 return -EINVAL; 4774 4775 /* Too big */ 4776 if (nr_pages > max_pages) 4777 return -ENOMEM; 4778 4779 /* Hmm? */ 4780 if (count == 0) 4781 return 0; 4782 4783 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL) 4784 return -ENOMEM; 4785 4786 /* Try to fault in all of the necessary pages */ 4787 /* rw==READ means read from drive, write into memory area */ 4788 res = get_user_pages_unlocked( 4789 current, 4790 current->mm, 4791 uaddr, 4792 nr_pages, 4793 rw == READ, 4794 0, /* don't force */ 4795 pages); 4796 4797 /* Errors and no page mapped should return here */ 4798 if (res < nr_pages) 4799 goto out_unmap; 4800 4801 for (i=0; i < nr_pages; i++) { 4802 /* FIXME: flush superflous for rw==READ, 4803 * probably wrong function for rw==WRITE 4804 */ 4805 flush_dcache_page(pages[i]); 4806 } 4807 4808 mdata->offset = uaddr & ~PAGE_MASK; 4809 STbp->mapped_pages = pages; 4810 4811 return nr_pages; 4812 out_unmap: 4813 if (res > 0) { 4814 for (j=0; j < res; j++) 4815 page_cache_release(pages[j]); 4816 res = 0; 4817 } 4818 kfree(pages); 4819 return res; 4820 } 4821 4822 4823 /* And unmap them... */ 4824 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4825 const unsigned int nr_pages, int dirtied) 4826 { 4827 int i; 4828 4829 for (i=0; i < nr_pages; i++) { 4830 struct page *page = STbp->mapped_pages[i]; 4831 4832 if (dirtied) 4833 SetPageDirty(page); 4834 /* FIXME: cache flush missing for rw==READ 4835 * FIXME: call the correct reference counting function 4836 */ 4837 page_cache_release(page); 4838 } 4839 kfree(STbp->mapped_pages); 4840 STbp->mapped_pages = NULL; 4841 4842 return 0; 4843 } 4844