1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying 4 file Documentation/scsi/st.txt for more information. 5 6 History: 7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. 8 Contribution and ideas from several people including (in alphabetical 9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, 10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, 11 Michael Schaefer, J"org Weule, and Eric Youngdale. 12 13 Copyright 1992 - 2016 Kai Makisara 14 email Kai.Makisara@kolumbus.fi 15 16 Some small formal changes - aeb, 950809 17 18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 19 */ 20 21 static const char *verstr = "20160209"; 22 23 #include <linux/module.h> 24 25 #include <linux/fs.h> 26 #include <linux/kernel.h> 27 #include <linux/sched/signal.h> 28 #include <linux/mm.h> 29 #include <linux/init.h> 30 #include <linux/string.h> 31 #include <linux/slab.h> 32 #include <linux/errno.h> 33 #include <linux/mtio.h> 34 #include <linux/cdrom.h> 35 #include <linux/ioctl.h> 36 #include <linux/fcntl.h> 37 #include <linux/spinlock.h> 38 #include <linux/blkdev.h> 39 #include <linux/moduleparam.h> 40 #include <linux/cdev.h> 41 #include <linux/idr.h> 42 #include <linux/delay.h> 43 #include <linux/mutex.h> 44 45 #include <linux/uaccess.h> 46 #include <asm/dma.h> 47 48 #include <scsi/scsi.h> 49 #include <scsi/scsi_dbg.h> 50 #include <scsi/scsi_device.h> 51 #include <scsi/scsi_driver.h> 52 #include <scsi/scsi_eh.h> 53 #include <scsi/scsi_host.h> 54 #include <scsi/scsi_ioctl.h> 55 #include <scsi/sg.h> 56 57 58 /* The driver prints some debugging information on the console if DEBUG 59 is defined and non-zero. */ 60 #define DEBUG 1 61 #define NO_DEBUG 0 62 63 #define ST_DEB_MSG KERN_NOTICE 64 #if DEBUG 65 /* The message level for the debug messages is currently set to KERN_NOTICE 66 so that people can easily see the messages. Later when the debugging messages 67 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 68 #define DEB(a) a 69 #define DEBC(a) if (debugging) { a ; } 70 #else 71 #define DEB(a) 72 #define DEBC(a) 73 #endif 74 75 #define ST_KILOBYTE 1024 76 77 #include "st_options.h" 78 #include "st.h" 79 80 static int buffer_kbs; 81 static int max_sg_segs; 82 static int try_direct_io = TRY_DIRECT_IO; 83 static int try_rdio = 1; 84 static int try_wdio = 1; 85 static int debug_flag; 86 87 static struct class st_sysfs_class; 88 static const struct attribute_group *st_dev_groups[]; 89 static const struct attribute_group *st_drv_groups[]; 90 91 MODULE_AUTHOR("Kai Makisara"); 92 MODULE_DESCRIPTION("SCSI tape (st) driver"); 93 MODULE_LICENSE("GPL"); 94 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 95 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 96 97 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 98 * of sysfs parameters (which module_param doesn't yet support). 99 * Sysfs parameters defined explicitly later. 100 */ 101 module_param_named(buffer_kbs, buffer_kbs, int, 0); 102 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 103 module_param_named(max_sg_segs, max_sg_segs, int, 0); 104 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 105 module_param_named(try_direct_io, try_direct_io, int, 0); 106 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 107 module_param_named(debug_flag, debug_flag, int, 0); 108 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 109 110 111 /* Extra parameters for testing */ 112 module_param_named(try_rdio, try_rdio, int, 0); 113 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 114 module_param_named(try_wdio, try_wdio, int, 0); 115 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 116 117 #ifndef MODULE 118 static int write_threshold_kbs; /* retained for compatibility */ 119 static struct st_dev_parm { 120 char *name; 121 int *val; 122 } parms[] __initdata = { 123 { 124 "buffer_kbs", &buffer_kbs 125 }, 126 { /* Retained for compatibility with 2.4 */ 127 "write_threshold_kbs", &write_threshold_kbs 128 }, 129 { 130 "max_sg_segs", NULL 131 }, 132 { 133 "try_direct_io", &try_direct_io 134 }, 135 { 136 "debug_flag", &debug_flag 137 } 138 }; 139 #endif 140 141 /* Restrict the number of modes so that names for all are assigned */ 142 #if ST_NBR_MODES > 16 143 #error "Maximum number of modes is 16" 144 #endif 145 /* Bit reversed order to get same names for same minors with all 146 mode counts */ 147 static const char *st_formats[] = { 148 "", "r", "k", "s", "l", "t", "o", "u", 149 "m", "v", "p", "x", "a", "y", "q", "z"}; 150 151 /* The default definitions have been moved to st_options.h */ 152 153 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 154 155 /* The buffer size should fit into the 24 bits for length in the 156 6-byte SCSI read and write commands. */ 157 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 158 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 159 #endif 160 161 static int debugging = DEBUG; 162 163 #define MAX_RETRIES 0 164 #define MAX_WRITE_RETRIES 0 165 #define MAX_READY_RETRIES 0 166 #define NO_TAPE NOT_READY 167 168 #define ST_TIMEOUT (900 * HZ) 169 #define ST_LONG_TIMEOUT (14000 * HZ) 170 171 /* Remove mode bits and auto-rewind bit (7) */ 172 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 173 (iminor(x) & ((1 << ST_MODE_SHIFT)-1))) 174 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 175 176 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 177 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 178 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 179 180 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 181 24 bits) */ 182 #define SET_DENS_AND_BLK 0x10001 183 184 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 185 static int st_max_sg_segs = ST_MAX_SG; 186 187 static int modes_defined; 188 189 static int enlarge_buffer(struct st_buffer *, int, int); 190 static void clear_buffer(struct st_buffer *); 191 static void normalize_buffer(struct st_buffer *); 192 static int append_to_buffer(const char __user *, struct st_buffer *, int); 193 static int from_buffer(struct st_buffer *, char __user *, int); 194 static void move_buffer_data(struct st_buffer *, int); 195 196 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 197 unsigned long, size_t, int); 198 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 199 200 static int st_probe(struct device *); 201 static int st_remove(struct device *); 202 203 static struct scsi_driver st_template = { 204 .gendrv = { 205 .name = "st", 206 .owner = THIS_MODULE, 207 .probe = st_probe, 208 .remove = st_remove, 209 .groups = st_drv_groups, 210 }, 211 }; 212 213 static int st_compression(struct scsi_tape *, int); 214 215 static int find_partition(struct scsi_tape *); 216 static int switch_partition(struct scsi_tape *); 217 218 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 219 220 static void scsi_tape_release(struct kref *); 221 222 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 223 224 static DEFINE_MUTEX(st_ref_mutex); 225 static DEFINE_SPINLOCK(st_index_lock); 226 static DEFINE_SPINLOCK(st_use_lock); 227 static DEFINE_IDR(st_index_idr); 228 229 230 231 #include "osst_detect.h" 232 #ifndef SIGS_FROM_OSST 233 #define SIGS_FROM_OSST \ 234 {"OnStream", "SC-", "", "osst"}, \ 235 {"OnStream", "DI-", "", "osst"}, \ 236 {"OnStream", "DP-", "", "osst"}, \ 237 {"OnStream", "USB", "", "osst"}, \ 238 {"OnStream", "FW-", "", "osst"} 239 #endif 240 241 static struct scsi_tape *scsi_tape_get(int dev) 242 { 243 struct scsi_tape *STp = NULL; 244 245 mutex_lock(&st_ref_mutex); 246 spin_lock(&st_index_lock); 247 248 STp = idr_find(&st_index_idr, dev); 249 if (!STp) goto out; 250 251 kref_get(&STp->kref); 252 253 if (!STp->device) 254 goto out_put; 255 256 if (scsi_device_get(STp->device)) 257 goto out_put; 258 259 goto out; 260 261 out_put: 262 kref_put(&STp->kref, scsi_tape_release); 263 STp = NULL; 264 out: 265 spin_unlock(&st_index_lock); 266 mutex_unlock(&st_ref_mutex); 267 return STp; 268 } 269 270 static void scsi_tape_put(struct scsi_tape *STp) 271 { 272 struct scsi_device *sdev = STp->device; 273 274 mutex_lock(&st_ref_mutex); 275 kref_put(&STp->kref, scsi_tape_release); 276 scsi_device_put(sdev); 277 mutex_unlock(&st_ref_mutex); 278 } 279 280 struct st_reject_data { 281 char *vendor; 282 char *model; 283 char *rev; 284 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 285 }; 286 287 static struct st_reject_data reject_list[] = { 288 /* {"XXX", "Yy-", "", NULL}, example */ 289 SIGS_FROM_OSST, 290 {NULL, }}; 291 292 /* If the device signature is on the list of incompatible drives, the 293 function returns a pointer to the name of the correct driver (if known) */ 294 static char * st_incompatible(struct scsi_device* SDp) 295 { 296 struct st_reject_data *rp; 297 298 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 299 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 300 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 301 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 302 if (rp->driver_hint) 303 return rp->driver_hint; 304 else 305 return "unknown"; 306 } 307 return NULL; 308 } 309 310 311 static inline char *tape_name(struct scsi_tape *tape) 312 { 313 return tape->disk->disk_name; 314 } 315 316 #define st_printk(prefix, t, fmt, a...) \ 317 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) 318 #ifdef DEBUG 319 #define DEBC_printk(t, fmt, a...) \ 320 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 321 #else 322 #define DEBC_printk(t, fmt, a...) 323 #endif 324 325 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 326 { 327 const u8 *ucp; 328 const u8 *sense = SRpnt->sense; 329 330 s->have_sense = scsi_normalize_sense(SRpnt->sense, 331 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 332 s->flags = 0; 333 334 if (s->have_sense) { 335 s->deferred = 0; 336 s->remainder_valid = 337 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 338 switch (sense[0] & 0x7f) { 339 case 0x71: 340 s->deferred = 1; 341 /* fall through */ 342 case 0x70: 343 s->fixed_format = 1; 344 s->flags = sense[2] & 0xe0; 345 break; 346 case 0x73: 347 s->deferred = 1; 348 /* fall through */ 349 case 0x72: 350 s->fixed_format = 0; 351 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 352 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 353 break; 354 } 355 } 356 } 357 358 359 /* Convert the result to success code */ 360 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 361 { 362 int result = SRpnt->result; 363 u8 scode; 364 DEB(const char *stp;) 365 char *name = tape_name(STp); 366 struct st_cmdstatus *cmdstatp; 367 368 if (!result) 369 return 0; 370 371 cmdstatp = &STp->buffer->cmdstat; 372 st_analyze_sense(SRpnt, cmdstatp); 373 374 if (cmdstatp->have_sense) 375 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 376 else 377 scode = 0; 378 379 DEB( 380 if (debugging) { 381 st_printk(ST_DEB_MSG, STp, 382 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 383 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 384 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 385 if (cmdstatp->have_sense) 386 __scsi_print_sense(STp->device, name, 387 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 388 } ) /* end DEB */ 389 if (!debugging) { /* Abnormal conditions for tape */ 390 if (!cmdstatp->have_sense) 391 st_printk(KERN_WARNING, STp, 392 "Error %x (driver bt 0x%x, host bt 0x%x).\n", 393 result, driver_byte(result), host_byte(result)); 394 else if (cmdstatp->have_sense && 395 scode != NO_SENSE && 396 scode != RECOVERED_ERROR && 397 /* scode != UNIT_ATTENTION && */ 398 scode != BLANK_CHECK && 399 scode != VOLUME_OVERFLOW && 400 SRpnt->cmd[0] != MODE_SENSE && 401 SRpnt->cmd[0] != TEST_UNIT_READY) { 402 403 __scsi_print_sense(STp->device, name, 404 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 405 } 406 } 407 408 if (cmdstatp->fixed_format && 409 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 410 if (STp->cln_sense_value) 411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 412 STp->cln_sense_mask) == STp->cln_sense_value); 413 else 414 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 415 STp->cln_sense_mask) != 0); 416 } 417 if (cmdstatp->have_sense && 418 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 419 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 420 421 STp->pos_unknown |= STp->device->was_reset; 422 423 if (cmdstatp->have_sense && 424 scode == RECOVERED_ERROR 425 #if ST_RECOVERED_WRITE_FATAL 426 && SRpnt->cmd[0] != WRITE_6 427 && SRpnt->cmd[0] != WRITE_FILEMARKS 428 #endif 429 ) { 430 STp->recover_count++; 431 STp->recover_reg++; 432 433 DEB( 434 if (debugging) { 435 if (SRpnt->cmd[0] == READ_6) 436 stp = "read"; 437 else if (SRpnt->cmd[0] == WRITE_6) 438 stp = "write"; 439 else 440 stp = "ioctl"; 441 st_printk(ST_DEB_MSG, STp, 442 "Recovered %s error (%d).\n", 443 stp, STp->recover_count); 444 } ) /* end DEB */ 445 446 if (cmdstatp->flags == 0) 447 return 0; 448 } 449 return (-EIO); 450 } 451 452 static struct st_request *st_allocate_request(struct scsi_tape *stp) 453 { 454 struct st_request *streq; 455 456 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 457 if (streq) 458 streq->stp = stp; 459 else { 460 st_printk(KERN_ERR, stp, 461 "Can't get SCSI request.\n"); 462 if (signal_pending(current)) 463 stp->buffer->syscall_result = -EINTR; 464 else 465 stp->buffer->syscall_result = -EBUSY; 466 } 467 468 return streq; 469 } 470 471 static void st_release_request(struct st_request *streq) 472 { 473 kfree(streq); 474 } 475 476 static void st_do_stats(struct scsi_tape *STp, struct request *req) 477 { 478 ktime_t now; 479 480 now = ktime_get(); 481 if (scsi_req(req)->cmd[0] == WRITE_6) { 482 now = ktime_sub(now, STp->stats->write_time); 483 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 485 atomic64_inc(&STp->stats->write_cnt); 486 if (scsi_req(req)->result) { 487 atomic64_add(atomic_read(&STp->stats->last_write_size) 488 - STp->buffer->cmdstat.residual, 489 &STp->stats->write_byte_cnt); 490 if (STp->buffer->cmdstat.residual > 0) 491 atomic64_inc(&STp->stats->resid_cnt); 492 } else 493 atomic64_add(atomic_read(&STp->stats->last_write_size), 494 &STp->stats->write_byte_cnt); 495 } else if (scsi_req(req)->cmd[0] == READ_6) { 496 now = ktime_sub(now, STp->stats->read_time); 497 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 499 atomic64_inc(&STp->stats->read_cnt); 500 if (scsi_req(req)->result) { 501 atomic64_add(atomic_read(&STp->stats->last_read_size) 502 - STp->buffer->cmdstat.residual, 503 &STp->stats->read_byte_cnt); 504 if (STp->buffer->cmdstat.residual > 0) 505 atomic64_inc(&STp->stats->resid_cnt); 506 } else 507 atomic64_add(atomic_read(&STp->stats->last_read_size), 508 &STp->stats->read_byte_cnt); 509 } else { 510 now = ktime_sub(now, STp->stats->other_time); 511 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 512 atomic64_inc(&STp->stats->other_cnt); 513 } 514 atomic64_dec(&STp->stats->in_flight); 515 } 516 517 static void st_scsi_execute_end(struct request *req, blk_status_t status) 518 { 519 struct st_request *SRpnt = req->end_io_data; 520 struct scsi_request *rq = scsi_req(req); 521 struct scsi_tape *STp = SRpnt->stp; 522 struct bio *tmp; 523 524 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result; 525 STp->buffer->cmdstat.residual = rq->resid_len; 526 527 st_do_stats(STp, req); 528 529 tmp = SRpnt->bio; 530 if (rq->sense_len) 531 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE); 532 if (SRpnt->waiting) 533 complete(SRpnt->waiting); 534 535 blk_rq_unmap_user(tmp); 536 blk_put_request(req); 537 } 538 539 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 540 int data_direction, void *buffer, unsigned bufflen, 541 int timeout, int retries) 542 { 543 struct request *req; 544 struct scsi_request *rq; 545 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 546 int err = 0; 547 struct scsi_tape *STp = SRpnt->stp; 548 549 req = blk_get_request(SRpnt->stp->device->request_queue, 550 data_direction == DMA_TO_DEVICE ? 551 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); 552 if (IS_ERR(req)) 553 return DRIVER_ERROR << 24; 554 rq = scsi_req(req); 555 req->rq_flags |= RQF_QUIET; 556 557 mdata->null_mapped = 1; 558 559 if (bufflen) { 560 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 561 GFP_KERNEL); 562 if (err) { 563 blk_put_request(req); 564 return DRIVER_ERROR << 24; 565 } 566 } 567 568 atomic64_inc(&STp->stats->in_flight); 569 if (cmd[0] == WRITE_6) { 570 atomic_set(&STp->stats->last_write_size, bufflen); 571 STp->stats->write_time = ktime_get(); 572 } else if (cmd[0] == READ_6) { 573 atomic_set(&STp->stats->last_read_size, bufflen); 574 STp->stats->read_time = ktime_get(); 575 } else { 576 STp->stats->other_time = ktime_get(); 577 } 578 579 SRpnt->bio = req->bio; 580 rq->cmd_len = COMMAND_SIZE(cmd[0]); 581 memset(rq->cmd, 0, BLK_MAX_CDB); 582 memcpy(rq->cmd, cmd, rq->cmd_len); 583 req->timeout = timeout; 584 rq->retries = retries; 585 req->end_io_data = SRpnt; 586 587 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); 588 return 0; 589 } 590 591 /* Do the scsi command. Waits until command performed if do_wait is true. 592 Otherwise write_behind_check() is used to check that the command 593 has finished. */ 594 static struct st_request * 595 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 596 int bytes, int direction, int timeout, int retries, int do_wait) 597 { 598 struct completion *waiting; 599 struct rq_map_data *mdata = &STp->buffer->map_data; 600 int ret; 601 602 /* if async, make sure there's no command outstanding */ 603 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 604 st_printk(KERN_ERR, STp, 605 "Async command already active.\n"); 606 if (signal_pending(current)) 607 (STp->buffer)->syscall_result = (-EINTR); 608 else 609 (STp->buffer)->syscall_result = (-EBUSY); 610 return NULL; 611 } 612 613 if (!SRpnt) { 614 SRpnt = st_allocate_request(STp); 615 if (!SRpnt) 616 return NULL; 617 } 618 619 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 620 which IO is outstanding. It's nulled out when the IO completes. */ 621 if (!do_wait) 622 (STp->buffer)->last_SRpnt = SRpnt; 623 624 waiting = &STp->wait; 625 init_completion(waiting); 626 SRpnt->waiting = waiting; 627 628 if (STp->buffer->do_dio) { 629 mdata->page_order = 0; 630 mdata->nr_entries = STp->buffer->sg_segs; 631 mdata->pages = STp->buffer->mapped_pages; 632 } else { 633 mdata->page_order = STp->buffer->reserved_page_order; 634 mdata->nr_entries = 635 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 636 mdata->pages = STp->buffer->reserved_pages; 637 mdata->offset = 0; 638 } 639 640 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 641 STp->buffer->cmdstat.have_sense = 0; 642 STp->buffer->syscall_result = 0; 643 644 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 645 retries); 646 if (ret) { 647 /* could not allocate the buffer or request was too large */ 648 (STp->buffer)->syscall_result = (-EBUSY); 649 (STp->buffer)->last_SRpnt = NULL; 650 } else if (do_wait) { 651 wait_for_completion(waiting); 652 SRpnt->waiting = NULL; 653 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 654 } 655 656 return SRpnt; 657 } 658 659 660 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 661 write has been correct but EOM early warning reached, -EIO if write ended in 662 error or zero if write successful. Asynchronous writes are used only in 663 variable block mode. */ 664 static int write_behind_check(struct scsi_tape * STp) 665 { 666 int retval = 0; 667 struct st_buffer *STbuffer; 668 struct st_partstat *STps; 669 struct st_cmdstatus *cmdstatp; 670 struct st_request *SRpnt; 671 672 STbuffer = STp->buffer; 673 if (!STbuffer->writing) 674 return 0; 675 676 DEB( 677 if (STp->write_pending) 678 STp->nbr_waits++; 679 else 680 STp->nbr_finished++; 681 ) /* end DEB */ 682 683 wait_for_completion(&(STp->wait)); 684 SRpnt = STbuffer->last_SRpnt; 685 STbuffer->last_SRpnt = NULL; 686 SRpnt->waiting = NULL; 687 688 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 689 st_release_request(SRpnt); 690 691 STbuffer->buffer_bytes -= STbuffer->writing; 692 STps = &(STp->ps[STp->partition]); 693 if (STps->drv_block >= 0) { 694 if (STp->block_size == 0) 695 STps->drv_block++; 696 else 697 STps->drv_block += STbuffer->writing / STp->block_size; 698 } 699 700 cmdstatp = &STbuffer->cmdstat; 701 if (STbuffer->syscall_result) { 702 retval = -EIO; 703 if (cmdstatp->have_sense && !cmdstatp->deferred && 704 (cmdstatp->flags & SENSE_EOM) && 705 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 706 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 707 /* EOM at write-behind, has all data been written? */ 708 if (!cmdstatp->remainder_valid || 709 cmdstatp->uremainder64 == 0) 710 retval = -ENOSPC; 711 } 712 if (retval == -EIO) 713 STps->drv_block = -1; 714 } 715 STbuffer->writing = 0; 716 717 DEB(if (debugging && retval) 718 st_printk(ST_DEB_MSG, STp, 719 "Async write error %x, return value %d.\n", 720 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 721 722 return retval; 723 } 724 725 726 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 727 it messes up the block number). */ 728 static int cross_eof(struct scsi_tape * STp, int forward) 729 { 730 struct st_request *SRpnt; 731 unsigned char cmd[MAX_COMMAND_SIZE]; 732 733 cmd[0] = SPACE; 734 cmd[1] = 0x01; /* Space FileMarks */ 735 if (forward) { 736 cmd[2] = cmd[3] = 0; 737 cmd[4] = 1; 738 } else 739 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 740 cmd[5] = 0; 741 742 DEBC_printk(STp, "Stepping over filemark %s.\n", 743 forward ? "forward" : "backward"); 744 745 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 746 STp->device->request_queue->rq_timeout, 747 MAX_RETRIES, 1); 748 if (!SRpnt) 749 return (STp->buffer)->syscall_result; 750 751 st_release_request(SRpnt); 752 SRpnt = NULL; 753 754 if ((STp->buffer)->cmdstat.midlevel_result != 0) 755 st_printk(KERN_ERR, STp, 756 "Stepping over filemark %s failed.\n", 757 forward ? "forward" : "backward"); 758 759 return (STp->buffer)->syscall_result; 760 } 761 762 763 /* Flush the write buffer (never need to write if variable blocksize). */ 764 static int st_flush_write_buffer(struct scsi_tape * STp) 765 { 766 int transfer, blks; 767 int result; 768 unsigned char cmd[MAX_COMMAND_SIZE]; 769 struct st_request *SRpnt; 770 struct st_partstat *STps; 771 772 result = write_behind_check(STp); 773 if (result) 774 return result; 775 776 result = 0; 777 if (STp->dirty == 1) { 778 779 transfer = STp->buffer->buffer_bytes; 780 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 781 782 memset(cmd, 0, MAX_COMMAND_SIZE); 783 cmd[0] = WRITE_6; 784 cmd[1] = 1; 785 blks = transfer / STp->block_size; 786 cmd[2] = blks >> 16; 787 cmd[3] = blks >> 8; 788 cmd[4] = blks; 789 790 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 791 STp->device->request_queue->rq_timeout, 792 MAX_WRITE_RETRIES, 1); 793 if (!SRpnt) 794 return (STp->buffer)->syscall_result; 795 796 STps = &(STp->ps[STp->partition]); 797 if ((STp->buffer)->syscall_result != 0) { 798 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 799 800 if (cmdstatp->have_sense && !cmdstatp->deferred && 801 (cmdstatp->flags & SENSE_EOM) && 802 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 803 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 804 (!cmdstatp->remainder_valid || 805 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 806 STp->dirty = 0; 807 (STp->buffer)->buffer_bytes = 0; 808 if (STps->drv_block >= 0) 809 STps->drv_block += blks; 810 result = (-ENOSPC); 811 } else { 812 st_printk(KERN_ERR, STp, "Error on flush.\n"); 813 STps->drv_block = (-1); 814 result = (-EIO); 815 } 816 } else { 817 if (STps->drv_block >= 0) 818 STps->drv_block += blks; 819 STp->dirty = 0; 820 (STp->buffer)->buffer_bytes = 0; 821 } 822 st_release_request(SRpnt); 823 SRpnt = NULL; 824 } 825 return result; 826 } 827 828 829 /* Flush the tape buffer. The tape will be positioned correctly unless 830 seek_next is true. */ 831 static int flush_buffer(struct scsi_tape *STp, int seek_next) 832 { 833 int backspace, result; 834 struct st_partstat *STps; 835 836 /* 837 * If there was a bus reset, block further access 838 * to this device. 839 */ 840 if (STp->pos_unknown) 841 return (-EIO); 842 843 if (STp->ready != ST_READY) 844 return 0; 845 STps = &(STp->ps[STp->partition]); 846 if (STps->rw == ST_WRITING) /* Writing */ 847 return st_flush_write_buffer(STp); 848 849 if (STp->block_size == 0) 850 return 0; 851 852 backspace = ((STp->buffer)->buffer_bytes + 853 (STp->buffer)->read_pointer) / STp->block_size - 854 ((STp->buffer)->read_pointer + STp->block_size - 1) / 855 STp->block_size; 856 (STp->buffer)->buffer_bytes = 0; 857 (STp->buffer)->read_pointer = 0; 858 result = 0; 859 if (!seek_next) { 860 if (STps->eof == ST_FM_HIT) { 861 result = cross_eof(STp, 0); /* Back over the EOF hit */ 862 if (!result) 863 STps->eof = ST_NOEOF; 864 else { 865 if (STps->drv_file >= 0) 866 STps->drv_file++; 867 STps->drv_block = 0; 868 } 869 } 870 if (!result && backspace > 0) 871 result = st_int_ioctl(STp, MTBSR, backspace); 872 } else if (STps->eof == ST_FM_HIT) { 873 if (STps->drv_file >= 0) 874 STps->drv_file++; 875 STps->drv_block = 0; 876 STps->eof = ST_NOEOF; 877 } 878 return result; 879 880 } 881 882 /* Set the mode parameters */ 883 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 884 { 885 int set_it = 0; 886 unsigned long arg; 887 888 if (!STp->density_changed && 889 STm->default_density >= 0 && 890 STm->default_density != STp->density) { 891 arg = STm->default_density; 892 set_it = 1; 893 } else 894 arg = STp->density; 895 arg <<= MT_ST_DENSITY_SHIFT; 896 if (!STp->blksize_changed && 897 STm->default_blksize >= 0 && 898 STm->default_blksize != STp->block_size) { 899 arg |= STm->default_blksize; 900 set_it = 1; 901 } else 902 arg |= STp->block_size; 903 if (set_it && 904 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 905 st_printk(KERN_WARNING, STp, 906 "Can't set default block size to %d bytes " 907 "and density %x.\n", 908 STm->default_blksize, STm->default_density); 909 if (modes_defined) 910 return (-EINVAL); 911 } 912 return 0; 913 } 914 915 916 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 917 static int do_door_lock(struct scsi_tape * STp, int do_lock) 918 { 919 int retval; 920 921 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 922 923 retval = scsi_set_medium_removal(STp->device, 924 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 925 if (!retval) 926 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 927 else 928 STp->door_locked = ST_LOCK_FAILS; 929 return retval; 930 } 931 932 933 /* Set the internal state after reset */ 934 static void reset_state(struct scsi_tape *STp) 935 { 936 int i; 937 struct st_partstat *STps; 938 939 STp->pos_unknown = 0; 940 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 941 STps = &(STp->ps[i]); 942 STps->rw = ST_IDLE; 943 STps->eof = ST_NOEOF; 944 STps->at_sm = 0; 945 STps->last_block_valid = 0; 946 STps->drv_block = -1; 947 STps->drv_file = -1; 948 } 949 if (STp->can_partitions) { 950 STp->partition = find_partition(STp); 951 if (STp->partition < 0) 952 STp->partition = 0; 953 STp->new_partition = STp->partition; 954 } 955 } 956 957 /* Test if the drive is ready. Returns either one of the codes below or a negative system 958 error code. */ 959 #define CHKRES_READY 0 960 #define CHKRES_NEW_SESSION 1 961 #define CHKRES_NOT_READY 2 962 #define CHKRES_NO_TAPE 3 963 964 #define MAX_ATTENTIONS 10 965 966 static int test_ready(struct scsi_tape *STp, int do_wait) 967 { 968 int attentions, waits, max_wait, scode; 969 int retval = CHKRES_READY, new_session = 0; 970 unsigned char cmd[MAX_COMMAND_SIZE]; 971 struct st_request *SRpnt = NULL; 972 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 973 974 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 975 976 for (attentions=waits=0; ; ) { 977 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 978 cmd[0] = TEST_UNIT_READY; 979 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 980 STp->long_timeout, MAX_READY_RETRIES, 1); 981 982 if (!SRpnt) { 983 retval = (STp->buffer)->syscall_result; 984 break; 985 } 986 987 if (cmdstatp->have_sense) { 988 989 scode = cmdstatp->sense_hdr.sense_key; 990 991 if (scode == UNIT_ATTENTION) { /* New media? */ 992 new_session = 1; 993 if (attentions < MAX_ATTENTIONS) { 994 attentions++; 995 continue; 996 } 997 else { 998 retval = (-EIO); 999 break; 1000 } 1001 } 1002 1003 if (scode == NOT_READY) { 1004 if (waits < max_wait) { 1005 if (msleep_interruptible(1000)) { 1006 retval = (-EINTR); 1007 break; 1008 } 1009 waits++; 1010 continue; 1011 } 1012 else { 1013 if ((STp->device)->scsi_level >= SCSI_2 && 1014 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1015 retval = CHKRES_NO_TAPE; 1016 else 1017 retval = CHKRES_NOT_READY; 1018 break; 1019 } 1020 } 1021 } 1022 1023 retval = (STp->buffer)->syscall_result; 1024 if (!retval) 1025 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1026 break; 1027 } 1028 1029 if (SRpnt != NULL) 1030 st_release_request(SRpnt); 1031 return retval; 1032 } 1033 1034 1035 /* See if the drive is ready and gather information about the tape. Return values: 1036 < 0 negative error code from errno.h 1037 0 drive ready 1038 1 drive not ready (possibly no tape) 1039 */ 1040 static int check_tape(struct scsi_tape *STp, struct file *filp) 1041 { 1042 int i, retval, new_session = 0, do_wait; 1043 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1044 unsigned short st_flags = filp->f_flags; 1045 struct st_request *SRpnt = NULL; 1046 struct st_modedef *STm; 1047 struct st_partstat *STps; 1048 struct inode *inode = file_inode(filp); 1049 int mode = TAPE_MODE(inode); 1050 1051 STp->ready = ST_READY; 1052 1053 if (mode != STp->current_mode) { 1054 DEBC_printk(STp, "Mode change from %d to %d.\n", 1055 STp->current_mode, mode); 1056 new_session = 1; 1057 STp->current_mode = mode; 1058 } 1059 STm = &(STp->modes[STp->current_mode]); 1060 1061 saved_cleaning = STp->cleaning_req; 1062 STp->cleaning_req = 0; 1063 1064 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1065 retval = test_ready(STp, do_wait); 1066 1067 if (retval < 0) 1068 goto err_out; 1069 1070 if (retval == CHKRES_NEW_SESSION) { 1071 STp->pos_unknown = 0; 1072 STp->partition = STp->new_partition = 0; 1073 if (STp->can_partitions) 1074 STp->nbr_partitions = 1; /* This guess will be updated later 1075 if necessary */ 1076 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1077 STps = &(STp->ps[i]); 1078 STps->rw = ST_IDLE; 1079 STps->eof = ST_NOEOF; 1080 STps->at_sm = 0; 1081 STps->last_block_valid = 0; 1082 STps->drv_block = 0; 1083 STps->drv_file = 0; 1084 } 1085 new_session = 1; 1086 } 1087 else { 1088 STp->cleaning_req |= saved_cleaning; 1089 1090 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1091 if (retval == CHKRES_NO_TAPE) 1092 STp->ready = ST_NO_TAPE; 1093 else 1094 STp->ready = ST_NOT_READY; 1095 1096 STp->density = 0; /* Clear the erroneous "residue" */ 1097 STp->write_prot = 0; 1098 STp->block_size = 0; 1099 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1100 STp->partition = STp->new_partition = 0; 1101 STp->door_locked = ST_UNLOCKED; 1102 return CHKRES_NOT_READY; 1103 } 1104 } 1105 1106 if (STp->omit_blklims) 1107 STp->min_block = STp->max_block = (-1); 1108 else { 1109 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1110 cmd[0] = READ_BLOCK_LIMITS; 1111 1112 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1113 STp->device->request_queue->rq_timeout, 1114 MAX_READY_RETRIES, 1); 1115 if (!SRpnt) { 1116 retval = (STp->buffer)->syscall_result; 1117 goto err_out; 1118 } 1119 1120 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1121 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1122 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1123 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1124 (STp->buffer)->b_data[5]; 1125 if ( DEB( debugging || ) !STp->inited) 1126 st_printk(KERN_INFO, STp, 1127 "Block limits %d - %d bytes.\n", 1128 STp->min_block, STp->max_block); 1129 } else { 1130 STp->min_block = STp->max_block = (-1); 1131 DEBC_printk(STp, "Can't read block limits.\n"); 1132 } 1133 } 1134 1135 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1136 cmd[0] = MODE_SENSE; 1137 cmd[4] = 12; 1138 1139 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1140 STp->device->request_queue->rq_timeout, 1141 MAX_READY_RETRIES, 1); 1142 if (!SRpnt) { 1143 retval = (STp->buffer)->syscall_result; 1144 goto err_out; 1145 } 1146 1147 if ((STp->buffer)->syscall_result != 0) { 1148 DEBC_printk(STp, "No Mode Sense.\n"); 1149 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1150 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1151 STp->drv_write_prot = 0; 1152 } else { 1153 DEBC_printk(STp,"Mode sense. Length %d, " 1154 "medium %x, WBS %x, BLL %d\n", 1155 (STp->buffer)->b_data[0], 1156 (STp->buffer)->b_data[1], 1157 (STp->buffer)->b_data[2], 1158 (STp->buffer)->b_data[3]); 1159 1160 if ((STp->buffer)->b_data[3] >= 8) { 1161 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1162 STp->density = (STp->buffer)->b_data[4]; 1163 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1164 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1165 DEBC_printk(STp, "Density %x, tape length: %x, " 1166 "drv buffer: %d\n", 1167 STp->density, 1168 (STp->buffer)->b_data[5] * 65536 + 1169 (STp->buffer)->b_data[6] * 256 + 1170 (STp->buffer)->b_data[7], 1171 STp->drv_buffer); 1172 } 1173 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1174 if (!STp->drv_buffer && STp->immediate_filemark) { 1175 st_printk(KERN_WARNING, STp, 1176 "non-buffered tape: disabling " 1177 "writing immediate filemarks\n"); 1178 STp->immediate_filemark = 0; 1179 } 1180 } 1181 st_release_request(SRpnt); 1182 SRpnt = NULL; 1183 STp->inited = 1; 1184 1185 if (STp->block_size > 0) 1186 (STp->buffer)->buffer_blocks = 1187 (STp->buffer)->buffer_size / STp->block_size; 1188 else 1189 (STp->buffer)->buffer_blocks = 1; 1190 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1191 1192 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1193 STp->block_size, (STp->buffer)->buffer_size, 1194 (STp->buffer)->buffer_blocks); 1195 1196 if (STp->drv_write_prot) { 1197 STp->write_prot = 1; 1198 1199 DEBC_printk(STp, "Write protected\n"); 1200 1201 if (do_wait && 1202 ((st_flags & O_ACCMODE) == O_WRONLY || 1203 (st_flags & O_ACCMODE) == O_RDWR)) { 1204 retval = (-EROFS); 1205 goto err_out; 1206 } 1207 } 1208 1209 if (STp->can_partitions && STp->nbr_partitions < 1) { 1210 /* This code is reached when the device is opened for the first time 1211 after the driver has been initialized with tape in the drive and the 1212 partition support has been enabled. */ 1213 DEBC_printk(STp, "Updating partition number in status.\n"); 1214 if ((STp->partition = find_partition(STp)) < 0) { 1215 retval = STp->partition; 1216 goto err_out; 1217 } 1218 STp->new_partition = STp->partition; 1219 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1220 } 1221 1222 if (new_session) { /* Change the drive parameters for the new mode */ 1223 STp->density_changed = STp->blksize_changed = 0; 1224 STp->compression_changed = 0; 1225 if (!(STm->defaults_for_writes) && 1226 (retval = set_mode_densblk(STp, STm)) < 0) 1227 goto err_out; 1228 1229 if (STp->default_drvbuffer != 0xff) { 1230 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1231 st_printk(KERN_WARNING, STp, 1232 "Can't set default drive " 1233 "buffering to %d.\n", 1234 STp->default_drvbuffer); 1235 } 1236 } 1237 1238 return CHKRES_READY; 1239 1240 err_out: 1241 return retval; 1242 } 1243 1244 1245 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1246 module count. */ 1247 static int st_open(struct inode *inode, struct file *filp) 1248 { 1249 int i, retval = (-EIO); 1250 int resumed = 0; 1251 struct scsi_tape *STp; 1252 struct st_partstat *STps; 1253 int dev = TAPE_NR(inode); 1254 1255 /* 1256 * We really want to do nonseekable_open(inode, filp); here, but some 1257 * versions of tar incorrectly call lseek on tapes and bail out if that 1258 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1259 */ 1260 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1261 1262 if (!(STp = scsi_tape_get(dev))) { 1263 return -ENXIO; 1264 } 1265 1266 filp->private_data = STp; 1267 1268 spin_lock(&st_use_lock); 1269 if (STp->in_use) { 1270 spin_unlock(&st_use_lock); 1271 scsi_tape_put(STp); 1272 DEBC_printk(STp, "Device already in use.\n"); 1273 return (-EBUSY); 1274 } 1275 1276 STp->in_use = 1; 1277 spin_unlock(&st_use_lock); 1278 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1279 1280 if (scsi_autopm_get_device(STp->device) < 0) { 1281 retval = -EIO; 1282 goto err_out; 1283 } 1284 resumed = 1; 1285 if (!scsi_block_when_processing_errors(STp->device)) { 1286 retval = (-ENXIO); 1287 goto err_out; 1288 } 1289 1290 /* See that we have at least a one page buffer available */ 1291 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1292 st_printk(KERN_WARNING, STp, 1293 "Can't allocate one page tape buffer.\n"); 1294 retval = (-EOVERFLOW); 1295 goto err_out; 1296 } 1297 1298 (STp->buffer)->cleared = 0; 1299 (STp->buffer)->writing = 0; 1300 (STp->buffer)->syscall_result = 0; 1301 1302 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1303 1304 STp->dirty = 0; 1305 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1306 STps = &(STp->ps[i]); 1307 STps->rw = ST_IDLE; 1308 } 1309 STp->try_dio_now = STp->try_dio; 1310 STp->recover_count = 0; 1311 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1312 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1313 1314 retval = check_tape(STp, filp); 1315 if (retval < 0) 1316 goto err_out; 1317 if ((filp->f_flags & O_NONBLOCK) == 0 && 1318 retval != CHKRES_READY) { 1319 if (STp->ready == NO_TAPE) 1320 retval = (-ENOMEDIUM); 1321 else 1322 retval = (-EIO); 1323 goto err_out; 1324 } 1325 return 0; 1326 1327 err_out: 1328 normalize_buffer(STp->buffer); 1329 spin_lock(&st_use_lock); 1330 STp->in_use = 0; 1331 spin_unlock(&st_use_lock); 1332 if (resumed) 1333 scsi_autopm_put_device(STp->device); 1334 scsi_tape_put(STp); 1335 return retval; 1336 1337 } 1338 1339 1340 /* Flush the tape buffer before close */ 1341 static int st_flush(struct file *filp, fl_owner_t id) 1342 { 1343 int result = 0, result2; 1344 unsigned char cmd[MAX_COMMAND_SIZE]; 1345 struct st_request *SRpnt; 1346 struct scsi_tape *STp = filp->private_data; 1347 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1348 struct st_partstat *STps = &(STp->ps[STp->partition]); 1349 1350 if (file_count(filp) > 1) 1351 return 0; 1352 1353 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1354 result = st_flush_write_buffer(STp); 1355 if (result != 0 && result != (-ENOSPC)) 1356 goto out; 1357 } 1358 1359 if (STp->can_partitions && 1360 (result2 = switch_partition(STp)) < 0) { 1361 DEBC_printk(STp, "switch_partition at close failed.\n"); 1362 if (result == 0) 1363 result = result2; 1364 goto out; 1365 } 1366 1367 DEBC( if (STp->nbr_requests) 1368 st_printk(KERN_DEBUG, STp, 1369 "Number of r/w requests %d, dio used in %d, " 1370 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1371 STp->nbr_pages)); 1372 1373 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1374 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1375 1376 #if DEBUG 1377 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1378 STp->nbr_waits, STp->nbr_finished); 1379 #endif 1380 memset(cmd, 0, MAX_COMMAND_SIZE); 1381 cmd[0] = WRITE_FILEMARKS; 1382 if (STp->immediate_filemark) 1383 cmd[1] = 1; 1384 cmd[4] = 1 + STp->two_fm; 1385 1386 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1387 STp->device->request_queue->rq_timeout, 1388 MAX_WRITE_RETRIES, 1); 1389 if (!SRpnt) { 1390 result = (STp->buffer)->syscall_result; 1391 goto out; 1392 } 1393 1394 if (STp->buffer->syscall_result == 0 || 1395 (cmdstatp->have_sense && !cmdstatp->deferred && 1396 (cmdstatp->flags & SENSE_EOM) && 1397 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1398 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1399 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1400 /* Write successful at EOM */ 1401 st_release_request(SRpnt); 1402 SRpnt = NULL; 1403 if (STps->drv_file >= 0) 1404 STps->drv_file++; 1405 STps->drv_block = 0; 1406 if (STp->two_fm) 1407 cross_eof(STp, 0); 1408 STps->eof = ST_FM; 1409 } 1410 else { /* Write error */ 1411 st_release_request(SRpnt); 1412 SRpnt = NULL; 1413 st_printk(KERN_ERR, STp, 1414 "Error on write filemark.\n"); 1415 if (result == 0) 1416 result = (-EIO); 1417 } 1418 1419 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1420 } else if (!STp->rew_at_close) { 1421 STps = &(STp->ps[STp->partition]); 1422 if (!STm->sysv || STps->rw != ST_READING) { 1423 if (STp->can_bsr) 1424 result = flush_buffer(STp, 0); 1425 else if (STps->eof == ST_FM_HIT) { 1426 result = cross_eof(STp, 0); 1427 if (result) { 1428 if (STps->drv_file >= 0) 1429 STps->drv_file++; 1430 STps->drv_block = 0; 1431 STps->eof = ST_FM; 1432 } else 1433 STps->eof = ST_NOEOF; 1434 } 1435 } else if ((STps->eof == ST_NOEOF && 1436 !(result = cross_eof(STp, 1))) || 1437 STps->eof == ST_FM_HIT) { 1438 if (STps->drv_file >= 0) 1439 STps->drv_file++; 1440 STps->drv_block = 0; 1441 STps->eof = ST_FM; 1442 } 1443 } 1444 1445 out: 1446 if (STp->rew_at_close) { 1447 result2 = st_int_ioctl(STp, MTREW, 1); 1448 if (result == 0) 1449 result = result2; 1450 } 1451 return result; 1452 } 1453 1454 1455 /* Close the device and release it. BKL is not needed: this is the only thread 1456 accessing this tape. */ 1457 static int st_release(struct inode *inode, struct file *filp) 1458 { 1459 int result = 0; 1460 struct scsi_tape *STp = filp->private_data; 1461 1462 if (STp->door_locked == ST_LOCKED_AUTO) 1463 do_door_lock(STp, 0); 1464 1465 normalize_buffer(STp->buffer); 1466 spin_lock(&st_use_lock); 1467 STp->in_use = 0; 1468 spin_unlock(&st_use_lock); 1469 scsi_autopm_put_device(STp->device); 1470 scsi_tape_put(STp); 1471 1472 return result; 1473 } 1474 1475 /* The checks common to both reading and writing */ 1476 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1477 { 1478 ssize_t retval = 0; 1479 1480 /* 1481 * If we are in the middle of error recovery, don't let anyone 1482 * else try and use this device. Also, if error recovery fails, it 1483 * may try and take the device offline, in which case all further 1484 * access to the device is prohibited. 1485 */ 1486 if (!scsi_block_when_processing_errors(STp->device)) { 1487 retval = (-ENXIO); 1488 goto out; 1489 } 1490 1491 if (STp->ready != ST_READY) { 1492 if (STp->ready == ST_NO_TAPE) 1493 retval = (-ENOMEDIUM); 1494 else 1495 retval = (-EIO); 1496 goto out; 1497 } 1498 1499 if (! STp->modes[STp->current_mode].defined) { 1500 retval = (-ENXIO); 1501 goto out; 1502 } 1503 1504 1505 /* 1506 * If there was a bus reset, block further access 1507 * to this device. 1508 */ 1509 if (STp->pos_unknown) { 1510 retval = (-EIO); 1511 goto out; 1512 } 1513 1514 if (count == 0) 1515 goto out; 1516 1517 DEB( 1518 if (!STp->in_use) { 1519 st_printk(ST_DEB_MSG, STp, 1520 "Incorrect device.\n"); 1521 retval = (-EIO); 1522 goto out; 1523 } ) /* end DEB */ 1524 1525 if (STp->can_partitions && 1526 (retval = switch_partition(STp)) < 0) 1527 goto out; 1528 1529 if (STp->block_size == 0 && STp->max_block > 0 && 1530 (count < STp->min_block || count > STp->max_block)) { 1531 retval = (-EINVAL); 1532 goto out; 1533 } 1534 1535 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1536 !do_door_lock(STp, 1)) 1537 STp->door_locked = ST_LOCKED_AUTO; 1538 1539 out: 1540 return retval; 1541 } 1542 1543 1544 static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1545 size_t count, int is_read) 1546 { 1547 int i, bufsize, retval = 0; 1548 struct st_buffer *STbp = STp->buffer; 1549 1550 if (is_read) 1551 i = STp->try_dio_now && try_rdio; 1552 else 1553 i = STp->try_dio_now && try_wdio; 1554 1555 if (i && ((unsigned long)buf & queue_dma_alignment( 1556 STp->device->request_queue)) == 0) { 1557 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1558 count, (is_read ? READ : WRITE)); 1559 if (i > 0) { 1560 STbp->do_dio = i; 1561 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1562 } 1563 else 1564 STbp->do_dio = 0; /* fall back to buffering with any error */ 1565 STbp->sg_segs = STbp->do_dio; 1566 DEB( 1567 if (STbp->do_dio) { 1568 STp->nbr_dio++; 1569 STp->nbr_pages += STbp->do_dio; 1570 } 1571 ) 1572 } else 1573 STbp->do_dio = 0; 1574 DEB( STp->nbr_requests++; ) 1575 1576 if (!STbp->do_dio) { 1577 if (STp->block_size) 1578 bufsize = STp->block_size > st_fixed_buffer_size ? 1579 STp->block_size : st_fixed_buffer_size; 1580 else { 1581 bufsize = count; 1582 /* Make sure that data from previous user is not leaked even if 1583 HBA does not return correct residual */ 1584 if (is_read && STp->sili && !STbp->cleared) 1585 clear_buffer(STbp); 1586 } 1587 1588 if (bufsize > STbp->buffer_size && 1589 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { 1590 st_printk(KERN_WARNING, STp, 1591 "Can't allocate %d byte tape buffer.\n", 1592 bufsize); 1593 retval = (-EOVERFLOW); 1594 goto out; 1595 } 1596 if (STp->block_size) 1597 STbp->buffer_blocks = bufsize / STp->block_size; 1598 } 1599 1600 out: 1601 return retval; 1602 } 1603 1604 1605 /* Can be called more than once after each setup_buffer() */ 1606 static void release_buffering(struct scsi_tape *STp, int is_read) 1607 { 1608 struct st_buffer *STbp; 1609 1610 STbp = STp->buffer; 1611 if (STbp->do_dio) { 1612 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1613 STbp->do_dio = 0; 1614 STbp->sg_segs = 0; 1615 } 1616 } 1617 1618 1619 /* Write command */ 1620 static ssize_t 1621 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1622 { 1623 ssize_t total; 1624 ssize_t i, do_count, blks, transfer; 1625 ssize_t retval; 1626 int undone, retry_eot = 0, scode; 1627 int async_write; 1628 unsigned char cmd[MAX_COMMAND_SIZE]; 1629 const char __user *b_point; 1630 struct st_request *SRpnt = NULL; 1631 struct scsi_tape *STp = filp->private_data; 1632 struct st_modedef *STm; 1633 struct st_partstat *STps; 1634 struct st_buffer *STbp; 1635 1636 if (mutex_lock_interruptible(&STp->lock)) 1637 return -ERESTARTSYS; 1638 1639 retval = rw_checks(STp, filp, count); 1640 if (retval || count == 0) 1641 goto out; 1642 1643 /* Write must be integral number of blocks */ 1644 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1645 st_printk(KERN_WARNING, STp, 1646 "Write not multiple of tape block size.\n"); 1647 retval = (-EINVAL); 1648 goto out; 1649 } 1650 1651 STm = &(STp->modes[STp->current_mode]); 1652 STps = &(STp->ps[STp->partition]); 1653 1654 if (STp->write_prot) { 1655 retval = (-EACCES); 1656 goto out; 1657 } 1658 1659 1660 if (STps->rw == ST_READING) { 1661 retval = flush_buffer(STp, 0); 1662 if (retval) 1663 goto out; 1664 STps->rw = ST_WRITING; 1665 } else if (STps->rw != ST_WRITING && 1666 STps->drv_file == 0 && STps->drv_block == 0) { 1667 if ((retval = set_mode_densblk(STp, STm)) < 0) 1668 goto out; 1669 if (STm->default_compression != ST_DONT_TOUCH && 1670 !(STp->compression_changed)) { 1671 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1672 st_printk(KERN_WARNING, STp, 1673 "Can't set default compression.\n"); 1674 if (modes_defined) { 1675 retval = (-EINVAL); 1676 goto out; 1677 } 1678 } 1679 } 1680 } 1681 1682 STbp = STp->buffer; 1683 i = write_behind_check(STp); 1684 if (i) { 1685 if (i == -ENOSPC) 1686 STps->eof = ST_EOM_OK; 1687 else 1688 STps->eof = ST_EOM_ERROR; 1689 } 1690 1691 if (STps->eof == ST_EOM_OK) { 1692 STps->eof = ST_EOD_1; /* allow next write */ 1693 retval = (-ENOSPC); 1694 goto out; 1695 } 1696 else if (STps->eof == ST_EOM_ERROR) { 1697 retval = (-EIO); 1698 goto out; 1699 } 1700 1701 /* Check the buffer readability in cases where copy_user might catch 1702 the problems after some tape movement. */ 1703 if (STp->block_size != 0 && 1704 !STbp->do_dio && 1705 (copy_from_user(&i, buf, 1) != 0 || 1706 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1707 retval = (-EFAULT); 1708 goto out; 1709 } 1710 1711 retval = setup_buffering(STp, buf, count, 0); 1712 if (retval) 1713 goto out; 1714 1715 total = count; 1716 1717 memset(cmd, 0, MAX_COMMAND_SIZE); 1718 cmd[0] = WRITE_6; 1719 cmd[1] = (STp->block_size != 0); 1720 1721 STps->rw = ST_WRITING; 1722 1723 b_point = buf; 1724 while (count > 0 && !retry_eot) { 1725 1726 if (STbp->do_dio) { 1727 do_count = count; 1728 } 1729 else { 1730 if (STp->block_size == 0) 1731 do_count = count; 1732 else { 1733 do_count = STbp->buffer_blocks * STp->block_size - 1734 STbp->buffer_bytes; 1735 if (do_count > count) 1736 do_count = count; 1737 } 1738 1739 i = append_to_buffer(b_point, STbp, do_count); 1740 if (i) { 1741 retval = i; 1742 goto out; 1743 } 1744 } 1745 count -= do_count; 1746 b_point += do_count; 1747 1748 async_write = STp->block_size == 0 && !STbp->do_dio && 1749 STm->do_async_writes && STps->eof < ST_EOM_OK; 1750 1751 if (STp->block_size != 0 && STm->do_buffer_writes && 1752 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1753 STbp->buffer_bytes < STbp->buffer_size) { 1754 STp->dirty = 1; 1755 /* Don't write a buffer that is not full enough. */ 1756 if (!async_write && count == 0) 1757 break; 1758 } 1759 1760 retry_write: 1761 if (STp->block_size == 0) 1762 blks = transfer = do_count; 1763 else { 1764 if (!STbp->do_dio) 1765 blks = STbp->buffer_bytes; 1766 else 1767 blks = do_count; 1768 blks /= STp->block_size; 1769 transfer = blks * STp->block_size; 1770 } 1771 cmd[2] = blks >> 16; 1772 cmd[3] = blks >> 8; 1773 cmd[4] = blks; 1774 1775 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1776 STp->device->request_queue->rq_timeout, 1777 MAX_WRITE_RETRIES, !async_write); 1778 if (!SRpnt) { 1779 retval = STbp->syscall_result; 1780 goto out; 1781 } 1782 if (async_write && !STbp->syscall_result) { 1783 STbp->writing = transfer; 1784 STp->dirty = !(STbp->writing == 1785 STbp->buffer_bytes); 1786 SRpnt = NULL; /* Prevent releasing this request! */ 1787 DEB( STp->write_pending = 1; ) 1788 break; 1789 } 1790 1791 if (STbp->syscall_result != 0) { 1792 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1793 1794 DEBC_printk(STp, "Error on write:\n"); 1795 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1796 scode = cmdstatp->sense_hdr.sense_key; 1797 if (cmdstatp->remainder_valid) 1798 undone = (int)cmdstatp->uremainder64; 1799 else if (STp->block_size == 0 && 1800 scode == VOLUME_OVERFLOW) 1801 undone = transfer; 1802 else 1803 undone = 0; 1804 if (STp->block_size != 0) 1805 undone *= STp->block_size; 1806 if (undone <= do_count) { 1807 /* Only data from this write is not written */ 1808 count += undone; 1809 b_point -= undone; 1810 do_count -= undone; 1811 if (STp->block_size) 1812 blks = (transfer - undone) / STp->block_size; 1813 STps->eof = ST_EOM_OK; 1814 /* Continue in fixed block mode if all written 1815 in this request but still something left to write 1816 (retval left to zero) 1817 */ 1818 if (STp->block_size == 0 || 1819 undone > 0 || count == 0) 1820 retval = (-ENOSPC); /* EOM within current request */ 1821 DEBC_printk(STp, "EOM with %d " 1822 "bytes unwritten.\n", 1823 (int)count); 1824 } else { 1825 /* EOT within data buffered earlier (possible only 1826 in fixed block mode without direct i/o) */ 1827 if (!retry_eot && !cmdstatp->deferred && 1828 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1829 move_buffer_data(STp->buffer, transfer - undone); 1830 retry_eot = 1; 1831 if (STps->drv_block >= 0) { 1832 STps->drv_block += (transfer - undone) / 1833 STp->block_size; 1834 } 1835 STps->eof = ST_EOM_OK; 1836 DEBC_printk(STp, "Retry " 1837 "write of %d " 1838 "bytes at EOM.\n", 1839 STp->buffer->buffer_bytes); 1840 goto retry_write; 1841 } 1842 else { 1843 /* Either error within data buffered by driver or 1844 failed retry */ 1845 count -= do_count; 1846 blks = do_count = 0; 1847 STps->eof = ST_EOM_ERROR; 1848 STps->drv_block = (-1); /* Too cautious? */ 1849 retval = (-EIO); /* EOM for old data */ 1850 DEBC_printk(STp, "EOM with " 1851 "lost data.\n"); 1852 } 1853 } 1854 } else { 1855 count += do_count; 1856 STps->drv_block = (-1); /* Too cautious? */ 1857 retval = STbp->syscall_result; 1858 } 1859 1860 } 1861 1862 if (STps->drv_block >= 0) { 1863 if (STp->block_size == 0) 1864 STps->drv_block += (do_count > 0); 1865 else 1866 STps->drv_block += blks; 1867 } 1868 1869 STbp->buffer_bytes = 0; 1870 STp->dirty = 0; 1871 1872 if (retval || retry_eot) { 1873 if (count < total) 1874 retval = total - count; 1875 goto out; 1876 } 1877 } 1878 1879 if (STps->eof == ST_EOD_1) 1880 STps->eof = ST_EOM_OK; 1881 else if (STps->eof != ST_EOM_OK) 1882 STps->eof = ST_NOEOF; 1883 retval = total - count; 1884 1885 out: 1886 if (SRpnt != NULL) 1887 st_release_request(SRpnt); 1888 release_buffering(STp, 0); 1889 mutex_unlock(&STp->lock); 1890 1891 return retval; 1892 } 1893 1894 /* Read data from the tape. Returns zero in the normal case, one if the 1895 eof status has changed, and the negative error code in case of a 1896 fatal error. Otherwise updates the buffer and the eof state. 1897 1898 Does release user buffer mapping if it is set. 1899 */ 1900 static long read_tape(struct scsi_tape *STp, long count, 1901 struct st_request ** aSRpnt) 1902 { 1903 int transfer, blks, bytes; 1904 unsigned char cmd[MAX_COMMAND_SIZE]; 1905 struct st_request *SRpnt; 1906 struct st_modedef *STm; 1907 struct st_partstat *STps; 1908 struct st_buffer *STbp; 1909 int retval = 0; 1910 1911 if (count == 0) 1912 return 0; 1913 1914 STm = &(STp->modes[STp->current_mode]); 1915 STps = &(STp->ps[STp->partition]); 1916 if (STps->eof == ST_FM_HIT) 1917 return 1; 1918 STbp = STp->buffer; 1919 1920 if (STp->block_size == 0) 1921 blks = bytes = count; 1922 else { 1923 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1924 blks = (STp->buffer)->buffer_blocks; 1925 bytes = blks * STp->block_size; 1926 } else { 1927 bytes = count; 1928 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1929 bytes = (STp->buffer)->buffer_size; 1930 blks = bytes / STp->block_size; 1931 bytes = blks * STp->block_size; 1932 } 1933 } 1934 1935 memset(cmd, 0, MAX_COMMAND_SIZE); 1936 cmd[0] = READ_6; 1937 cmd[1] = (STp->block_size != 0); 1938 if (!cmd[1] && STp->sili) 1939 cmd[1] |= 2; 1940 cmd[2] = blks >> 16; 1941 cmd[3] = blks >> 8; 1942 cmd[4] = blks; 1943 1944 SRpnt = *aSRpnt; 1945 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1946 STp->device->request_queue->rq_timeout, 1947 MAX_RETRIES, 1); 1948 release_buffering(STp, 1); 1949 *aSRpnt = SRpnt; 1950 if (!SRpnt) 1951 return STbp->syscall_result; 1952 1953 STbp->read_pointer = 0; 1954 STps->at_sm = 0; 1955 1956 /* Something to check */ 1957 if (STbp->syscall_result) { 1958 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1959 1960 retval = 1; 1961 DEBC_printk(STp, 1962 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1963 SRpnt->sense[0], SRpnt->sense[1], 1964 SRpnt->sense[2], SRpnt->sense[3], 1965 SRpnt->sense[4], SRpnt->sense[5], 1966 SRpnt->sense[6], SRpnt->sense[7]); 1967 if (cmdstatp->have_sense) { 1968 1969 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1970 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1971 1972 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1973 /* Compute the residual count */ 1974 if (cmdstatp->remainder_valid) 1975 transfer = (int)cmdstatp->uremainder64; 1976 else 1977 transfer = 0; 1978 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) { 1979 if (STp->block_size == 0) 1980 transfer = bytes; 1981 /* Some drives set ILI with MEDIUM ERROR */ 1982 cmdstatp->flags &= ~SENSE_ILI; 1983 } 1984 1985 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1986 if (STp->block_size == 0 && 1987 transfer < 0) { 1988 st_printk(KERN_NOTICE, STp, 1989 "Failed to read %d " 1990 "byte block with %d " 1991 "byte transfer.\n", 1992 bytes - transfer, 1993 bytes); 1994 if (STps->drv_block >= 0) 1995 STps->drv_block += 1; 1996 STbp->buffer_bytes = 0; 1997 return (-ENOMEM); 1998 } else if (STp->block_size == 0) { 1999 STbp->buffer_bytes = bytes - transfer; 2000 } else { 2001 st_release_request(SRpnt); 2002 SRpnt = *aSRpnt = NULL; 2003 if (transfer == blks) { /* We did not get anything, error */ 2004 st_printk(KERN_NOTICE, STp, 2005 "Incorrect " 2006 "block size.\n"); 2007 if (STps->drv_block >= 0) 2008 STps->drv_block += blks - transfer + 1; 2009 st_int_ioctl(STp, MTBSR, 1); 2010 return (-EIO); 2011 } 2012 /* We have some data, deliver it */ 2013 STbp->buffer_bytes = (blks - transfer) * 2014 STp->block_size; 2015 DEBC_printk(STp, "ILI but " 2016 "enough data " 2017 "received %ld " 2018 "%d.\n", count, 2019 STbp->buffer_bytes); 2020 if (STps->drv_block >= 0) 2021 STps->drv_block += 1; 2022 if (st_int_ioctl(STp, MTBSR, 1)) 2023 return (-EIO); 2024 } 2025 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 2026 if (STps->eof != ST_FM_HIT) 2027 STps->eof = ST_FM_HIT; 2028 else 2029 STps->eof = ST_EOD_2; 2030 if (STp->block_size == 0) 2031 STbp->buffer_bytes = 0; 2032 else 2033 STbp->buffer_bytes = 2034 bytes - transfer * STp->block_size; 2035 DEBC_printk(STp, "EOF detected (%d " 2036 "bytes read).\n", 2037 STbp->buffer_bytes); 2038 } else if (cmdstatp->flags & SENSE_EOM) { 2039 if (STps->eof == ST_FM) 2040 STps->eof = ST_EOD_1; 2041 else 2042 STps->eof = ST_EOM_OK; 2043 if (STp->block_size == 0) 2044 STbp->buffer_bytes = bytes - transfer; 2045 else 2046 STbp->buffer_bytes = 2047 bytes - transfer * STp->block_size; 2048 2049 DEBC_printk(STp, "EOM detected (%d " 2050 "bytes read).\n", 2051 STbp->buffer_bytes); 2052 } 2053 } 2054 /* end of EOF, EOM, ILI test */ 2055 else { /* nonzero sense key */ 2056 DEBC_printk(STp, "Tape error while reading.\n"); 2057 STps->drv_block = (-1); 2058 if (STps->eof == ST_FM && 2059 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 2060 DEBC_printk(STp, "Zero returned for " 2061 "first BLANK CHECK " 2062 "after EOF.\n"); 2063 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 2064 } else /* Some other extended sense code */ 2065 retval = (-EIO); 2066 } 2067 2068 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 2069 STbp->buffer_bytes = 0; 2070 } 2071 /* End of extended sense test */ 2072 else { /* Non-extended sense */ 2073 retval = STbp->syscall_result; 2074 } 2075 2076 } 2077 /* End of error handling */ 2078 else { /* Read successful */ 2079 STbp->buffer_bytes = bytes; 2080 if (STp->sili) /* In fixed block mode residual is always zero here */ 2081 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2082 } 2083 2084 if (STps->drv_block >= 0) { 2085 if (STp->block_size == 0) 2086 STps->drv_block++; 2087 else 2088 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2089 } 2090 return retval; 2091 } 2092 2093 2094 /* Read command */ 2095 static ssize_t 2096 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2097 { 2098 ssize_t total; 2099 ssize_t retval = 0; 2100 ssize_t i, transfer; 2101 int special, do_dio = 0; 2102 struct st_request *SRpnt = NULL; 2103 struct scsi_tape *STp = filp->private_data; 2104 struct st_modedef *STm; 2105 struct st_partstat *STps; 2106 struct st_buffer *STbp = STp->buffer; 2107 2108 if (mutex_lock_interruptible(&STp->lock)) 2109 return -ERESTARTSYS; 2110 2111 retval = rw_checks(STp, filp, count); 2112 if (retval || count == 0) 2113 goto out; 2114 2115 STm = &(STp->modes[STp->current_mode]); 2116 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2117 if (!STm->do_read_ahead) { 2118 retval = (-EINVAL); /* Read must be integral number of blocks */ 2119 goto out; 2120 } 2121 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2122 } 2123 2124 STps = &(STp->ps[STp->partition]); 2125 if (STps->rw == ST_WRITING) { 2126 retval = flush_buffer(STp, 0); 2127 if (retval) 2128 goto out; 2129 STps->rw = ST_READING; 2130 } 2131 DEB( 2132 if (debugging && STps->eof != ST_NOEOF) 2133 st_printk(ST_DEB_MSG, STp, 2134 "EOF/EOM flag up (%d). Bytes %d\n", 2135 STps->eof, STbp->buffer_bytes); 2136 ) /* end DEB */ 2137 2138 retval = setup_buffering(STp, buf, count, 1); 2139 if (retval) 2140 goto out; 2141 do_dio = STbp->do_dio; 2142 2143 if (STbp->buffer_bytes == 0 && 2144 STps->eof >= ST_EOD_1) { 2145 if (STps->eof < ST_EOD) { 2146 STps->eof += 1; 2147 retval = 0; 2148 goto out; 2149 } 2150 retval = (-EIO); /* EOM or Blank Check */ 2151 goto out; 2152 } 2153 2154 if (do_dio) { 2155 /* Check the buffer writability before any tape movement. Don't alter 2156 buffer data. */ 2157 if (copy_from_user(&i, buf, 1) != 0 || 2158 copy_to_user(buf, &i, 1) != 0 || 2159 copy_from_user(&i, buf + count - 1, 1) != 0 || 2160 copy_to_user(buf + count - 1, &i, 1) != 0) { 2161 retval = (-EFAULT); 2162 goto out; 2163 } 2164 } 2165 2166 STps->rw = ST_READING; 2167 2168 2169 /* Loop until enough data in buffer or a special condition found */ 2170 for (total = 0, special = 0; total < count && !special;) { 2171 2172 /* Get new data if the buffer is empty */ 2173 if (STbp->buffer_bytes == 0) { 2174 special = read_tape(STp, count - total, &SRpnt); 2175 if (special < 0) { /* No need to continue read */ 2176 retval = special; 2177 goto out; 2178 } 2179 } 2180 2181 /* Move the data from driver buffer to user buffer */ 2182 if (STbp->buffer_bytes > 0) { 2183 DEB( 2184 if (debugging && STps->eof != ST_NOEOF) 2185 st_printk(ST_DEB_MSG, STp, 2186 "EOF up (%d). Left %d, needed %d.\n", 2187 STps->eof, STbp->buffer_bytes, 2188 (int)(count - total)); 2189 ) /* end DEB */ 2190 transfer = STbp->buffer_bytes < count - total ? 2191 STbp->buffer_bytes : count - total; 2192 if (!do_dio) { 2193 i = from_buffer(STbp, buf, transfer); 2194 if (i) { 2195 retval = i; 2196 goto out; 2197 } 2198 } 2199 buf += transfer; 2200 total += transfer; 2201 } 2202 2203 if (STp->block_size == 0) 2204 break; /* Read only one variable length block */ 2205 2206 } /* for (total = 0, special = 0; 2207 total < count && !special; ) */ 2208 2209 /* Change the eof state if no data from tape or buffer */ 2210 if (total == 0) { 2211 if (STps->eof == ST_FM_HIT) { 2212 STps->eof = ST_FM; 2213 STps->drv_block = 0; 2214 if (STps->drv_file >= 0) 2215 STps->drv_file++; 2216 } else if (STps->eof == ST_EOD_1) { 2217 STps->eof = ST_EOD_2; 2218 STps->drv_block = 0; 2219 if (STps->drv_file >= 0) 2220 STps->drv_file++; 2221 } else if (STps->eof == ST_EOD_2) 2222 STps->eof = ST_EOD; 2223 } else if (STps->eof == ST_FM) 2224 STps->eof = ST_NOEOF; 2225 retval = total; 2226 2227 out: 2228 if (SRpnt != NULL) { 2229 st_release_request(SRpnt); 2230 SRpnt = NULL; 2231 } 2232 if (do_dio) { 2233 release_buffering(STp, 1); 2234 STbp->buffer_bytes = 0; 2235 } 2236 mutex_unlock(&STp->lock); 2237 2238 return retval; 2239 } 2240 2241 2242 2243 DEB( 2244 /* Set the driver options */ 2245 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) 2246 { 2247 if (debugging) { 2248 st_printk(KERN_INFO, STp, 2249 "Mode %d options: buffer writes: %d, " 2250 "async writes: %d, read ahead: %d\n", 2251 STp->current_mode, STm->do_buffer_writes, 2252 STm->do_async_writes, STm->do_read_ahead); 2253 st_printk(KERN_INFO, STp, 2254 " can bsr: %d, two FMs: %d, " 2255 "fast mteom: %d, auto lock: %d,\n", 2256 STp->can_bsr, STp->two_fm, STp->fast_mteom, 2257 STp->do_auto_lock); 2258 st_printk(KERN_INFO, STp, 2259 " defs for wr: %d, no block limits: %d, " 2260 "partitions: %d, s2 log: %d\n", 2261 STm->defaults_for_writes, STp->omit_blklims, 2262 STp->can_partitions, STp->scsi2_logical); 2263 st_printk(KERN_INFO, STp, 2264 " sysv: %d nowait: %d sili: %d " 2265 "nowait_filemark: %d\n", 2266 STm->sysv, STp->immediate, STp->sili, 2267 STp->immediate_filemark); 2268 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); 2269 } 2270 } 2271 ) 2272 2273 2274 static int st_set_options(struct scsi_tape *STp, long options) 2275 { 2276 int value; 2277 long code; 2278 struct st_modedef *STm; 2279 struct cdev *cd0, *cd1; 2280 struct device *d0, *d1; 2281 2282 STm = &(STp->modes[STp->current_mode]); 2283 if (!STm->defined) { 2284 cd0 = STm->cdevs[0]; 2285 cd1 = STm->cdevs[1]; 2286 d0 = STm->devs[0]; 2287 d1 = STm->devs[1]; 2288 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2289 STm->cdevs[0] = cd0; 2290 STm->cdevs[1] = cd1; 2291 STm->devs[0] = d0; 2292 STm->devs[1] = d1; 2293 modes_defined = 1; 2294 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", 2295 STp->current_mode); 2296 } 2297 2298 code = options & MT_ST_OPTIONS; 2299 if (code == MT_ST_BOOLEANS) { 2300 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2301 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2302 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2303 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2304 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2305 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2306 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2307 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2308 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2309 if ((STp->device)->scsi_level >= SCSI_2) 2310 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2311 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2312 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2313 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2314 STm->sysv = (options & MT_ST_SYSV) != 0; 2315 STp->sili = (options & MT_ST_SILI) != 0; 2316 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2317 st_log_options(STp, STm); ) 2318 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2319 value = (code == MT_ST_SETBOOLEANS); 2320 if ((options & MT_ST_BUFFER_WRITES) != 0) 2321 STm->do_buffer_writes = value; 2322 if ((options & MT_ST_ASYNC_WRITES) != 0) 2323 STm->do_async_writes = value; 2324 if ((options & MT_ST_DEF_WRITES) != 0) 2325 STm->defaults_for_writes = value; 2326 if ((options & MT_ST_READ_AHEAD) != 0) 2327 STm->do_read_ahead = value; 2328 if ((options & MT_ST_TWO_FM) != 0) 2329 STp->two_fm = value; 2330 if ((options & MT_ST_FAST_MTEOM) != 0) 2331 STp->fast_mteom = value; 2332 if ((options & MT_ST_AUTO_LOCK) != 0) 2333 STp->do_auto_lock = value; 2334 if ((options & MT_ST_CAN_BSR) != 0) 2335 STp->can_bsr = value; 2336 if ((options & MT_ST_NO_BLKLIMS) != 0) 2337 STp->omit_blklims = value; 2338 if ((STp->device)->scsi_level >= SCSI_2 && 2339 (options & MT_ST_CAN_PARTITIONS) != 0) 2340 STp->can_partitions = value; 2341 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2342 STp->scsi2_logical = value; 2343 if ((options & MT_ST_NOWAIT) != 0) 2344 STp->immediate = value; 2345 if ((options & MT_ST_NOWAIT_EOF) != 0) 2346 STp->immediate_filemark = value; 2347 if ((options & MT_ST_SYSV) != 0) 2348 STm->sysv = value; 2349 if ((options & MT_ST_SILI) != 0) 2350 STp->sili = value; 2351 DEB( 2352 if ((options & MT_ST_DEBUGGING) != 0) 2353 debugging = value; 2354 st_log_options(STp, STm); ) 2355 } else if (code == MT_ST_WRITE_THRESHOLD) { 2356 /* Retained for compatibility */ 2357 } else if (code == MT_ST_DEF_BLKSIZE) { 2358 value = (options & ~MT_ST_OPTIONS); 2359 if (value == ~MT_ST_OPTIONS) { 2360 STm->default_blksize = (-1); 2361 DEBC_printk(STp, "Default block size disabled.\n"); 2362 } else { 2363 STm->default_blksize = value; 2364 DEBC_printk(STp,"Default block size set to " 2365 "%d bytes.\n", STm->default_blksize); 2366 if (STp->ready == ST_READY) { 2367 STp->blksize_changed = 0; 2368 set_mode_densblk(STp, STm); 2369 } 2370 } 2371 } else if (code == MT_ST_TIMEOUTS) { 2372 value = (options & ~MT_ST_OPTIONS); 2373 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2374 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2375 DEBC_printk(STp, "Long timeout set to %d seconds.\n", 2376 (value & ~MT_ST_SET_LONG_TIMEOUT)); 2377 } else { 2378 blk_queue_rq_timeout(STp->device->request_queue, 2379 value * HZ); 2380 DEBC_printk(STp, "Normal timeout set to %d seconds.\n", 2381 value); 2382 } 2383 } else if (code == MT_ST_SET_CLN) { 2384 value = (options & ~MT_ST_OPTIONS) & 0xff; 2385 if (value != 0 && 2386 (value < EXTENDED_SENSE_START || 2387 value >= SCSI_SENSE_BUFFERSIZE)) 2388 return (-EINVAL); 2389 STp->cln_mode = value; 2390 STp->cln_sense_mask = (options >> 8) & 0xff; 2391 STp->cln_sense_value = (options >> 16) & 0xff; 2392 st_printk(KERN_INFO, STp, 2393 "Cleaning request mode %d, mask %02x, value %02x\n", 2394 value, STp->cln_sense_mask, STp->cln_sense_value); 2395 } else if (code == MT_ST_DEF_OPTIONS) { 2396 code = (options & ~MT_ST_CLEAR_DEFAULT); 2397 value = (options & MT_ST_CLEAR_DEFAULT); 2398 if (code == MT_ST_DEF_DENSITY) { 2399 if (value == MT_ST_CLEAR_DEFAULT) { 2400 STm->default_density = (-1); 2401 DEBC_printk(STp, 2402 "Density default disabled.\n"); 2403 } else { 2404 STm->default_density = value & 0xff; 2405 DEBC_printk(STp, "Density default set to %x\n", 2406 STm->default_density); 2407 if (STp->ready == ST_READY) { 2408 STp->density_changed = 0; 2409 set_mode_densblk(STp, STm); 2410 } 2411 } 2412 } else if (code == MT_ST_DEF_DRVBUFFER) { 2413 if (value == MT_ST_CLEAR_DEFAULT) { 2414 STp->default_drvbuffer = 0xff; 2415 DEBC_printk(STp, 2416 "Drive buffer default disabled.\n"); 2417 } else { 2418 STp->default_drvbuffer = value & 7; 2419 DEBC_printk(STp, 2420 "Drive buffer default set to %x\n", 2421 STp->default_drvbuffer); 2422 if (STp->ready == ST_READY) 2423 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2424 } 2425 } else if (code == MT_ST_DEF_COMPRESSION) { 2426 if (value == MT_ST_CLEAR_DEFAULT) { 2427 STm->default_compression = ST_DONT_TOUCH; 2428 DEBC_printk(STp, 2429 "Compression default disabled.\n"); 2430 } else { 2431 if ((value & 0xff00) != 0) { 2432 STp->c_algo = (value & 0xff00) >> 8; 2433 DEBC_printk(STp, "Compression " 2434 "algorithm set to 0x%x.\n", 2435 STp->c_algo); 2436 } 2437 if ((value & 0xff) != 0xff) { 2438 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2439 DEBC_printk(STp, "Compression default " 2440 "set to %x\n", 2441 (value & 1)); 2442 if (STp->ready == ST_READY) { 2443 STp->compression_changed = 0; 2444 st_compression(STp, (STm->default_compression == ST_YES)); 2445 } 2446 } 2447 } 2448 } 2449 } else 2450 return (-EIO); 2451 2452 return 0; 2453 } 2454 2455 #define MODE_HEADER_LENGTH 4 2456 2457 /* Mode header and page byte offsets */ 2458 #define MH_OFF_DATA_LENGTH 0 2459 #define MH_OFF_MEDIUM_TYPE 1 2460 #define MH_OFF_DEV_SPECIFIC 2 2461 #define MH_OFF_BDESCS_LENGTH 3 2462 #define MP_OFF_PAGE_NBR 0 2463 #define MP_OFF_PAGE_LENGTH 1 2464 2465 /* Mode header and page bit masks */ 2466 #define MH_BIT_WP 0x80 2467 #define MP_MSK_PAGE_NBR 0x3f 2468 2469 /* Don't return block descriptors */ 2470 #define MODE_SENSE_OMIT_BDESCS 0x08 2471 2472 #define MODE_SELECT_PAGE_FORMAT 0x10 2473 2474 /* Read a mode page into the tape buffer. The block descriptors are included 2475 if incl_block_descs is true. The page control is ored to the page number 2476 parameter, if necessary. */ 2477 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2478 { 2479 unsigned char cmd[MAX_COMMAND_SIZE]; 2480 struct st_request *SRpnt; 2481 2482 memset(cmd, 0, MAX_COMMAND_SIZE); 2483 cmd[0] = MODE_SENSE; 2484 if (omit_block_descs) 2485 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2486 cmd[2] = page; 2487 cmd[4] = 255; 2488 2489 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2490 STp->device->request_queue->rq_timeout, 0, 1); 2491 if (SRpnt == NULL) 2492 return (STp->buffer)->syscall_result; 2493 2494 st_release_request(SRpnt); 2495 2496 return STp->buffer->syscall_result; 2497 } 2498 2499 2500 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2501 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2502 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2503 { 2504 int pgo; 2505 unsigned char cmd[MAX_COMMAND_SIZE]; 2506 struct st_request *SRpnt; 2507 int timeout; 2508 2509 memset(cmd, 0, MAX_COMMAND_SIZE); 2510 cmd[0] = MODE_SELECT; 2511 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2512 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2513 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2514 2515 /* Clear reserved fields */ 2516 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2517 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2518 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2519 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2520 2521 timeout = slow ? 2522 STp->long_timeout : STp->device->request_queue->rq_timeout; 2523 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2524 timeout, 0, 1); 2525 if (SRpnt == NULL) 2526 return (STp->buffer)->syscall_result; 2527 2528 st_release_request(SRpnt); 2529 2530 return STp->buffer->syscall_result; 2531 } 2532 2533 2534 #define COMPRESSION_PAGE 0x0f 2535 #define COMPRESSION_PAGE_LENGTH 16 2536 2537 #define CP_OFF_DCE_DCC 2 2538 #define CP_OFF_C_ALGO 7 2539 2540 #define DCE_MASK 0x80 2541 #define DCC_MASK 0x40 2542 #define RED_MASK 0x60 2543 2544 2545 /* Control the compression with mode page 15. Algorithm not changed if zero. 2546 2547 The block descriptors are read and written because Sony SDT-7000 does not 2548 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2549 Including block descriptors should not cause any harm to other drives. */ 2550 2551 static int st_compression(struct scsi_tape * STp, int state) 2552 { 2553 int retval; 2554 int mpoffs; /* Offset to mode page start */ 2555 unsigned char *b_data = (STp->buffer)->b_data; 2556 2557 if (STp->ready != ST_READY) 2558 return (-EIO); 2559 2560 /* Read the current page contents */ 2561 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2562 if (retval) { 2563 DEBC_printk(STp, "Compression mode page not supported.\n"); 2564 return (-EIO); 2565 } 2566 2567 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2568 DEBC_printk(STp, "Compression state is %d.\n", 2569 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); 2570 2571 /* Check if compression can be changed */ 2572 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2573 DEBC_printk(STp, "Compression not supported.\n"); 2574 return (-EIO); 2575 } 2576 2577 /* Do the change */ 2578 if (state) { 2579 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2580 if (STp->c_algo != 0) 2581 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2582 } 2583 else { 2584 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2585 if (STp->c_algo != 0) 2586 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2587 } 2588 2589 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2590 if (retval) { 2591 DEBC_printk(STp, "Compression change failed.\n"); 2592 return (-EIO); 2593 } 2594 DEBC_printk(STp, "Compression state changed to %d.\n", state); 2595 2596 STp->compression_changed = 1; 2597 return 0; 2598 } 2599 2600 2601 /* Process the load and unload commands (does unload if the load code is zero) */ 2602 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2603 { 2604 int retval = (-EIO), timeout; 2605 unsigned char cmd[MAX_COMMAND_SIZE]; 2606 struct st_partstat *STps; 2607 struct st_request *SRpnt; 2608 2609 if (STp->ready != ST_READY && !load_code) { 2610 if (STp->ready == ST_NO_TAPE) 2611 return (-ENOMEDIUM); 2612 else 2613 return (-EIO); 2614 } 2615 2616 memset(cmd, 0, MAX_COMMAND_SIZE); 2617 cmd[0] = START_STOP; 2618 if (load_code) 2619 cmd[4] |= 1; 2620 /* 2621 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2622 */ 2623 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2624 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2625 DEBC_printk(STp, " Enhanced %sload slot %2d.\n", 2626 (cmd[4]) ? "" : "un", 2627 load_code - MT_ST_HPLOADER_OFFSET); 2628 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2629 } 2630 if (STp->immediate) { 2631 cmd[1] = 1; /* Don't wait for completion */ 2632 timeout = STp->device->request_queue->rq_timeout; 2633 } 2634 else 2635 timeout = STp->long_timeout; 2636 2637 DEBC( 2638 if (!load_code) 2639 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); 2640 else 2641 st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); 2642 ); 2643 2644 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2645 timeout, MAX_RETRIES, 1); 2646 if (!SRpnt) 2647 return (STp->buffer)->syscall_result; 2648 2649 retval = (STp->buffer)->syscall_result; 2650 st_release_request(SRpnt); 2651 2652 if (!retval) { /* SCSI command successful */ 2653 2654 if (!load_code) { 2655 STp->rew_at_close = 0; 2656 STp->ready = ST_NO_TAPE; 2657 } 2658 else { 2659 STp->rew_at_close = STp->autorew_dev; 2660 retval = check_tape(STp, filp); 2661 if (retval > 0) 2662 retval = 0; 2663 } 2664 } 2665 else { 2666 STps = &(STp->ps[STp->partition]); 2667 STps->drv_file = STps->drv_block = (-1); 2668 } 2669 2670 return retval; 2671 } 2672 2673 #if DEBUG 2674 #define ST_DEB_FORWARD 0 2675 #define ST_DEB_BACKWARD 1 2676 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) 2677 { 2678 s32 sc; 2679 2680 if (!debugging) 2681 return; 2682 2683 sc = cmd[2] & 0x80 ? 0xff000000 : 0; 2684 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; 2685 if (direction) 2686 sc = -sc; 2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2688 direction ? "backward" : "forward", sc, units); 2689 } 2690 #else 2691 #define ST_DEB_FORWARD 0 2692 #define ST_DEB_BACKWARD 1 2693 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2694 #endif 2695 2696 2697 /* Internal ioctl function */ 2698 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2699 { 2700 int timeout; 2701 long ltmp; 2702 int ioctl_result; 2703 int chg_eof = 1; 2704 unsigned char cmd[MAX_COMMAND_SIZE]; 2705 struct st_request *SRpnt; 2706 struct st_partstat *STps; 2707 int fileno, blkno, at_sm, undone; 2708 int datalen = 0, direction = DMA_NONE; 2709 2710 WARN_ON(STp->buffer->do_dio != 0); 2711 if (STp->ready != ST_READY) { 2712 if (STp->ready == ST_NO_TAPE) 2713 return (-ENOMEDIUM); 2714 else 2715 return (-EIO); 2716 } 2717 timeout = STp->long_timeout; 2718 STps = &(STp->ps[STp->partition]); 2719 fileno = STps->drv_file; 2720 blkno = STps->drv_block; 2721 at_sm = STps->at_sm; 2722 2723 memset(cmd, 0, MAX_COMMAND_SIZE); 2724 switch (cmd_in) { 2725 case MTFSFM: 2726 chg_eof = 0; /* Changed from the FSF after this */ 2727 /* fall through */ 2728 case MTFSF: 2729 cmd[0] = SPACE; 2730 cmd[1] = 0x01; /* Space FileMarks */ 2731 cmd[2] = (arg >> 16); 2732 cmd[3] = (arg >> 8); 2733 cmd[4] = arg; 2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2735 if (fileno >= 0) 2736 fileno += arg; 2737 blkno = 0; 2738 at_sm &= (arg == 0); 2739 break; 2740 case MTBSFM: 2741 chg_eof = 0; /* Changed from the FSF after this */ 2742 /* fall through */ 2743 case MTBSF: 2744 cmd[0] = SPACE; 2745 cmd[1] = 0x01; /* Space FileMarks */ 2746 ltmp = (-arg); 2747 cmd[2] = (ltmp >> 16); 2748 cmd[3] = (ltmp >> 8); 2749 cmd[4] = ltmp; 2750 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2751 if (fileno >= 0) 2752 fileno -= arg; 2753 blkno = (-1); /* We can't know the block number */ 2754 at_sm &= (arg == 0); 2755 break; 2756 case MTFSR: 2757 cmd[0] = SPACE; 2758 cmd[1] = 0x00; /* Space Blocks */ 2759 cmd[2] = (arg >> 16); 2760 cmd[3] = (arg >> 8); 2761 cmd[4] = arg; 2762 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2763 if (blkno >= 0) 2764 blkno += arg; 2765 at_sm &= (arg == 0); 2766 break; 2767 case MTBSR: 2768 cmd[0] = SPACE; 2769 cmd[1] = 0x00; /* Space Blocks */ 2770 ltmp = (-arg); 2771 cmd[2] = (ltmp >> 16); 2772 cmd[3] = (ltmp >> 8); 2773 cmd[4] = ltmp; 2774 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2775 if (blkno >= 0) 2776 blkno -= arg; 2777 at_sm &= (arg == 0); 2778 break; 2779 case MTFSS: 2780 cmd[0] = SPACE; 2781 cmd[1] = 0x04; /* Space Setmarks */ 2782 cmd[2] = (arg >> 16); 2783 cmd[3] = (arg >> 8); 2784 cmd[4] = arg; 2785 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2786 if (arg != 0) { 2787 blkno = fileno = (-1); 2788 at_sm = 1; 2789 } 2790 break; 2791 case MTBSS: 2792 cmd[0] = SPACE; 2793 cmd[1] = 0x04; /* Space Setmarks */ 2794 ltmp = (-arg); 2795 cmd[2] = (ltmp >> 16); 2796 cmd[3] = (ltmp >> 8); 2797 cmd[4] = ltmp; 2798 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2799 if (arg != 0) { 2800 blkno = fileno = (-1); 2801 at_sm = 1; 2802 } 2803 break; 2804 case MTWEOF: 2805 case MTWEOFI: 2806 case MTWSM: 2807 if (STp->write_prot) 2808 return (-EACCES); 2809 cmd[0] = WRITE_FILEMARKS; 2810 if (cmd_in == MTWSM) 2811 cmd[1] = 2; 2812 if (cmd_in == MTWEOFI || 2813 (cmd_in == MTWEOF && STp->immediate_filemark)) 2814 cmd[1] |= 1; 2815 cmd[2] = (arg >> 16); 2816 cmd[3] = (arg >> 8); 2817 cmd[4] = arg; 2818 timeout = STp->device->request_queue->rq_timeout; 2819 DEBC( 2820 if (cmd_in != MTWSM) 2821 st_printk(ST_DEB_MSG, STp, 2822 "Writing %d filemarks.\n", 2823 cmd[2] * 65536 + 2824 cmd[3] * 256 + 2825 cmd[4]); 2826 else 2827 st_printk(ST_DEB_MSG, STp, 2828 "Writing %d setmarks.\n", 2829 cmd[2] * 65536 + 2830 cmd[3] * 256 + 2831 cmd[4]); 2832 ) 2833 if (fileno >= 0) 2834 fileno += arg; 2835 blkno = 0; 2836 at_sm = (cmd_in == MTWSM); 2837 break; 2838 case MTREW: 2839 cmd[0] = REZERO_UNIT; 2840 if (STp->immediate) { 2841 cmd[1] = 1; /* Don't wait for completion */ 2842 timeout = STp->device->request_queue->rq_timeout; 2843 } 2844 DEBC_printk(STp, "Rewinding tape.\n"); 2845 fileno = blkno = at_sm = 0; 2846 break; 2847 case MTNOP: 2848 DEBC_printk(STp, "No op on tape.\n"); 2849 return 0; /* Should do something ? */ 2850 break; 2851 case MTRETEN: 2852 cmd[0] = START_STOP; 2853 if (STp->immediate) { 2854 cmd[1] = 1; /* Don't wait for completion */ 2855 timeout = STp->device->request_queue->rq_timeout; 2856 } 2857 cmd[4] = 3; 2858 DEBC_printk(STp, "Retensioning tape.\n"); 2859 fileno = blkno = at_sm = 0; 2860 break; 2861 case MTEOM: 2862 if (!STp->fast_mteom) { 2863 /* space to the end of tape */ 2864 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2865 fileno = STps->drv_file; 2866 if (STps->eof >= ST_EOD_1) 2867 return 0; 2868 /* The next lines would hide the number of spaced FileMarks 2869 That's why I inserted the previous lines. I had no luck 2870 with detecting EOM with FSF, so we go now to EOM. 2871 Joerg Weule */ 2872 } else 2873 fileno = (-1); 2874 cmd[0] = SPACE; 2875 cmd[1] = 3; 2876 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2877 blkno = -1; 2878 at_sm = 0; 2879 break; 2880 case MTERASE: 2881 if (STp->write_prot) 2882 return (-EACCES); 2883 cmd[0] = ERASE; 2884 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2885 if (STp->immediate) { 2886 cmd[1] |= 2; /* Don't wait for completion */ 2887 timeout = STp->device->request_queue->rq_timeout; 2888 } 2889 else 2890 timeout = STp->long_timeout * 8; 2891 2892 DEBC_printk(STp, "Erasing tape.\n"); 2893 fileno = blkno = at_sm = 0; 2894 break; 2895 case MTSETBLK: /* Set block length */ 2896 case MTSETDENSITY: /* Set tape density */ 2897 case MTSETDRVBUFFER: /* Set drive buffering */ 2898 case SET_DENS_AND_BLK: /* Set density and block size */ 2899 chg_eof = 0; 2900 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2901 return (-EIO); /* Not allowed if data in buffer */ 2902 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2903 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2904 STp->max_block > 0 && 2905 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2906 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2907 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2908 return (-EINVAL); 2909 } 2910 cmd[0] = MODE_SELECT; 2911 if ((STp->use_pf & USE_PF)) 2912 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2913 cmd[4] = datalen = 12; 2914 direction = DMA_TO_DEVICE; 2915 2916 memset((STp->buffer)->b_data, 0, 12); 2917 if (cmd_in == MTSETDRVBUFFER) 2918 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2919 else 2920 (STp->buffer)->b_data[2] = 2921 STp->drv_buffer << 4; 2922 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2923 if (cmd_in == MTSETDENSITY) { 2924 (STp->buffer)->b_data[4] = arg; 2925 STp->density_changed = 1; /* At least we tried ;-) */ 2926 } else if (cmd_in == SET_DENS_AND_BLK) 2927 (STp->buffer)->b_data[4] = arg >> 24; 2928 else 2929 (STp->buffer)->b_data[4] = STp->density; 2930 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2931 ltmp = arg & MT_ST_BLKSIZE_MASK; 2932 if (cmd_in == MTSETBLK) 2933 STp->blksize_changed = 1; /* At least we tried ;-) */ 2934 } else 2935 ltmp = STp->block_size; 2936 (STp->buffer)->b_data[9] = (ltmp >> 16); 2937 (STp->buffer)->b_data[10] = (ltmp >> 8); 2938 (STp->buffer)->b_data[11] = ltmp; 2939 timeout = STp->device->request_queue->rq_timeout; 2940 DEBC( 2941 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2942 st_printk(ST_DEB_MSG, STp, 2943 "Setting block size to %d bytes.\n", 2944 (STp->buffer)->b_data[9] * 65536 + 2945 (STp->buffer)->b_data[10] * 256 + 2946 (STp->buffer)->b_data[11]); 2947 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2948 st_printk(ST_DEB_MSG, STp, 2949 "Setting density code to %x.\n", 2950 (STp->buffer)->b_data[4]); 2951 if (cmd_in == MTSETDRVBUFFER) 2952 st_printk(ST_DEB_MSG, STp, 2953 "Setting drive buffer code to %d.\n", 2954 ((STp->buffer)->b_data[2] >> 4) & 7); 2955 ) 2956 break; 2957 default: 2958 return (-ENOSYS); 2959 } 2960 2961 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2962 timeout, MAX_RETRIES, 1); 2963 if (!SRpnt) 2964 return (STp->buffer)->syscall_result; 2965 2966 ioctl_result = (STp->buffer)->syscall_result; 2967 2968 if (!ioctl_result) { /* SCSI command successful */ 2969 st_release_request(SRpnt); 2970 SRpnt = NULL; 2971 STps->drv_block = blkno; 2972 STps->drv_file = fileno; 2973 STps->at_sm = at_sm; 2974 2975 if (cmd_in == MTBSFM) 2976 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2977 else if (cmd_in == MTFSFM) 2978 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2979 2980 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2981 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2982 if (STp->block_size != 0) { 2983 (STp->buffer)->buffer_blocks = 2984 (STp->buffer)->buffer_size / STp->block_size; 2985 } 2986 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2987 if (cmd_in == SET_DENS_AND_BLK) 2988 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2989 } else if (cmd_in == MTSETDRVBUFFER) 2990 STp->drv_buffer = (arg & 7); 2991 else if (cmd_in == MTSETDENSITY) 2992 STp->density = arg; 2993 2994 if (cmd_in == MTEOM) 2995 STps->eof = ST_EOD; 2996 else if (cmd_in == MTFSF) 2997 STps->eof = ST_FM; 2998 else if (chg_eof) 2999 STps->eof = ST_NOEOF; 3000 3001 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3002 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3003 } else { /* SCSI command was not completely successful. Don't return 3004 from this block without releasing the SCSI command block! */ 3005 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3006 3007 if (cmdstatp->flags & SENSE_EOM) { 3008 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3009 cmd_in != MTBSR && cmd_in != MTBSS) 3010 STps->eof = ST_EOM_OK; 3011 STps->drv_block = 0; 3012 } 3013 3014 if (cmdstatp->remainder_valid) 3015 undone = (int)cmdstatp->uremainder64; 3016 else 3017 undone = 0; 3018 3019 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3020 cmdstatp->have_sense && 3021 (cmdstatp->flags & SENSE_EOM)) { 3022 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3023 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3024 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3025 STps->eof = ST_NOEOF; 3026 } else { /* Writing EOF(s) failed */ 3027 if (fileno >= 0) 3028 fileno -= undone; 3029 if (undone < arg) 3030 STps->eof = ST_NOEOF; 3031 } 3032 STps->drv_file = fileno; 3033 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3034 if (fileno >= 0) 3035 STps->drv_file = fileno - undone; 3036 else 3037 STps->drv_file = fileno; 3038 STps->drv_block = -1; 3039 STps->eof = ST_NOEOF; 3040 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3041 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3042 undone = (-undone); 3043 if (STps->drv_file >= 0) 3044 STps->drv_file = fileno + undone; 3045 STps->drv_block = 0; 3046 STps->eof = ST_NOEOF; 3047 } else if (cmd_in == MTFSR) { 3048 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3049 if (STps->drv_file >= 0) 3050 STps->drv_file++; 3051 STps->drv_block = 0; 3052 STps->eof = ST_FM; 3053 } else { 3054 if (blkno >= undone) 3055 STps->drv_block = blkno - undone; 3056 else 3057 STps->drv_block = (-1); 3058 STps->eof = ST_NOEOF; 3059 } 3060 } else if (cmd_in == MTBSR) { 3061 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3062 STps->drv_file--; 3063 STps->drv_block = (-1); 3064 } else { 3065 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3066 undone = (-undone); 3067 if (STps->drv_block >= 0) 3068 STps->drv_block = blkno + undone; 3069 } 3070 STps->eof = ST_NOEOF; 3071 } else if (cmd_in == MTEOM) { 3072 STps->drv_file = (-1); 3073 STps->drv_block = (-1); 3074 STps->eof = ST_EOD; 3075 } else if (cmd_in == MTSETBLK || 3076 cmd_in == MTSETDENSITY || 3077 cmd_in == MTSETDRVBUFFER || 3078 cmd_in == SET_DENS_AND_BLK) { 3079 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3080 !(STp->use_pf & PF_TESTED)) { 3081 /* Try the other possible state of Page Format if not 3082 already tried */ 3083 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3084 st_release_request(SRpnt); 3085 SRpnt = NULL; 3086 return st_int_ioctl(STp, cmd_in, arg); 3087 } 3088 } else if (chg_eof) 3089 STps->eof = ST_NOEOF; 3090 3091 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3092 STps->eof = ST_EOD; 3093 3094 st_release_request(SRpnt); 3095 SRpnt = NULL; 3096 } 3097 3098 return ioctl_result; 3099 } 3100 3101 3102 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3103 structure. */ 3104 3105 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3106 int logical) 3107 { 3108 int result; 3109 unsigned char scmd[MAX_COMMAND_SIZE]; 3110 struct st_request *SRpnt; 3111 3112 if (STp->ready != ST_READY) 3113 return (-EIO); 3114 3115 memset(scmd, 0, MAX_COMMAND_SIZE); 3116 if ((STp->device)->scsi_level < SCSI_2) { 3117 scmd[0] = QFA_REQUEST_BLOCK; 3118 scmd[4] = 3; 3119 } else { 3120 scmd[0] = READ_POSITION; 3121 if (!logical && !STp->scsi2_logical) 3122 scmd[1] = 1; 3123 } 3124 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3125 STp->device->request_queue->rq_timeout, 3126 MAX_READY_RETRIES, 1); 3127 if (!SRpnt) 3128 return (STp->buffer)->syscall_result; 3129 3130 if ((STp->buffer)->syscall_result != 0 || 3131 (STp->device->scsi_level >= SCSI_2 && 3132 ((STp->buffer)->b_data[0] & 4) != 0)) { 3133 *block = *partition = 0; 3134 DEBC_printk(STp, " Can't read tape position.\n"); 3135 result = (-EIO); 3136 } else { 3137 result = 0; 3138 if ((STp->device)->scsi_level < SCSI_2) { 3139 *block = ((STp->buffer)->b_data[0] << 16) 3140 + ((STp->buffer)->b_data[1] << 8) 3141 + (STp->buffer)->b_data[2]; 3142 *partition = 0; 3143 } else { 3144 *block = ((STp->buffer)->b_data[4] << 24) 3145 + ((STp->buffer)->b_data[5] << 16) 3146 + ((STp->buffer)->b_data[6] << 8) 3147 + (STp->buffer)->b_data[7]; 3148 *partition = (STp->buffer)->b_data[1]; 3149 if (((STp->buffer)->b_data[0] & 0x80) && 3150 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3151 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3152 } 3153 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3154 *block, *partition); 3155 } 3156 st_release_request(SRpnt); 3157 SRpnt = NULL; 3158 3159 return result; 3160 } 3161 3162 3163 /* Set the tape block and partition. Negative partition means that only the 3164 block should be set in vendor specific way. */ 3165 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3166 int logical) 3167 { 3168 struct st_partstat *STps; 3169 int result, p; 3170 unsigned int blk; 3171 int timeout; 3172 unsigned char scmd[MAX_COMMAND_SIZE]; 3173 struct st_request *SRpnt; 3174 3175 if (STp->ready != ST_READY) 3176 return (-EIO); 3177 timeout = STp->long_timeout; 3178 STps = &(STp->ps[STp->partition]); 3179 3180 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3181 block, partition); 3182 DEB(if (partition < 0) 3183 return (-EIO); ) 3184 3185 /* Update the location at the partition we are leaving */ 3186 if ((!STp->can_partitions && partition != 0) || 3187 partition >= ST_NBR_PARTITIONS) 3188 return (-EINVAL); 3189 if (partition != STp->partition) { 3190 if (get_location(STp, &blk, &p, 1)) 3191 STps->last_block_valid = 0; 3192 else { 3193 STps->last_block_valid = 1; 3194 STps->last_block_visited = blk; 3195 DEBC_printk(STp, "Visited block %d for " 3196 "partition %d saved.\n", 3197 blk, STp->partition); 3198 } 3199 } 3200 3201 memset(scmd, 0, MAX_COMMAND_SIZE); 3202 if ((STp->device)->scsi_level < SCSI_2) { 3203 scmd[0] = QFA_SEEK_BLOCK; 3204 scmd[2] = (block >> 16); 3205 scmd[3] = (block >> 8); 3206 scmd[4] = block; 3207 scmd[5] = 0; 3208 } else { 3209 scmd[0] = SEEK_10; 3210 scmd[3] = (block >> 24); 3211 scmd[4] = (block >> 16); 3212 scmd[5] = (block >> 8); 3213 scmd[6] = block; 3214 if (!logical && !STp->scsi2_logical) 3215 scmd[1] = 4; 3216 if (STp->partition != partition) { 3217 scmd[1] |= 2; 3218 scmd[8] = partition; 3219 DEBC_printk(STp, "Trying to change partition " 3220 "from %d to %d\n", STp->partition, 3221 partition); 3222 } 3223 } 3224 if (STp->immediate) { 3225 scmd[1] |= 1; /* Don't wait for completion */ 3226 timeout = STp->device->request_queue->rq_timeout; 3227 } 3228 3229 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3230 timeout, MAX_READY_RETRIES, 1); 3231 if (!SRpnt) 3232 return (STp->buffer)->syscall_result; 3233 3234 STps->drv_block = STps->drv_file = (-1); 3235 STps->eof = ST_NOEOF; 3236 if ((STp->buffer)->syscall_result != 0) { 3237 result = (-EIO); 3238 if (STp->can_partitions && 3239 (STp->device)->scsi_level >= SCSI_2 && 3240 (p = find_partition(STp)) >= 0) 3241 STp->partition = p; 3242 } else { 3243 if (STp->can_partitions) { 3244 STp->partition = partition; 3245 STps = &(STp->ps[partition]); 3246 if (!STps->last_block_valid || 3247 STps->last_block_visited != block) { 3248 STps->at_sm = 0; 3249 STps->rw = ST_IDLE; 3250 } 3251 } else 3252 STps->at_sm = 0; 3253 if (block == 0) 3254 STps->drv_block = STps->drv_file = 0; 3255 result = 0; 3256 } 3257 3258 st_release_request(SRpnt); 3259 SRpnt = NULL; 3260 3261 return result; 3262 } 3263 3264 3265 /* Find the current partition number for the drive status. Called from open and 3266 returns either partition number of negative error code. */ 3267 static int find_partition(struct scsi_tape *STp) 3268 { 3269 int i, partition; 3270 unsigned int block; 3271 3272 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3273 return i; 3274 if (partition >= ST_NBR_PARTITIONS) 3275 return (-EIO); 3276 return partition; 3277 } 3278 3279 3280 /* Change the partition if necessary */ 3281 static int switch_partition(struct scsi_tape *STp) 3282 { 3283 struct st_partstat *STps; 3284 3285 if (STp->partition == STp->new_partition) 3286 return 0; 3287 STps = &(STp->ps[STp->new_partition]); 3288 if (!STps->last_block_valid) 3289 STps->last_block_visited = 0; 3290 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3291 } 3292 3293 /* Functions for reading and writing the medium partition mode page. */ 3294 3295 #define PART_PAGE 0x11 3296 #define PART_PAGE_FIXED_LENGTH 8 3297 3298 #define PP_OFF_MAX_ADD_PARTS 2 3299 #define PP_OFF_NBR_ADD_PARTS 3 3300 #define PP_OFF_FLAGS 4 3301 #define PP_OFF_PART_UNITS 6 3302 #define PP_OFF_RESERVED 7 3303 3304 #define PP_BIT_IDP 0x20 3305 #define PP_BIT_FDP 0x80 3306 #define PP_MSK_PSUM_MB 0x10 3307 #define PP_MSK_PSUM_UNITS 0x18 3308 #define PP_MSK_POFM 0x04 3309 3310 /* Get the number of partitions on the tape. As a side effect reads the 3311 mode page into the tape buffer. */ 3312 static int nbr_partitions(struct scsi_tape *STp) 3313 { 3314 int result; 3315 3316 if (STp->ready != ST_READY) 3317 return (-EIO); 3318 3319 result = read_mode_page(STp, PART_PAGE, 1); 3320 3321 if (result) { 3322 DEBC_printk(STp, "Can't read medium partition page.\n"); 3323 result = (-EIO); 3324 } else { 3325 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3326 PP_OFF_NBR_ADD_PARTS] + 1; 3327 DEBC_printk(STp, "Number of partitions %d.\n", result); 3328 } 3329 3330 return result; 3331 } 3332 3333 3334 static int format_medium(struct scsi_tape *STp, int format) 3335 { 3336 int result = 0; 3337 int timeout = STp->long_timeout; 3338 unsigned char scmd[MAX_COMMAND_SIZE]; 3339 struct st_request *SRpnt; 3340 3341 memset(scmd, 0, MAX_COMMAND_SIZE); 3342 scmd[0] = FORMAT_UNIT; 3343 scmd[2] = format; 3344 if (STp->immediate) { 3345 scmd[1] |= 1; /* Don't wait for completion */ 3346 timeout = STp->device->request_queue->rq_timeout; 3347 } 3348 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3349 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3350 timeout, MAX_RETRIES, 1); 3351 if (!SRpnt) 3352 result = STp->buffer->syscall_result; 3353 return result; 3354 } 3355 3356 3357 /* Partition the tape into two partitions if size > 0 or one partition if 3358 size == 0. 3359 3360 The block descriptors are read and written because Sony SDT-7000 does not 3361 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3362 3363 My HP C1533A drive returns only one partition size field. This is used to 3364 set the size of partition 1. There is no size field for the default partition. 3365 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3366 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3367 The following algorithm is used to accommodate both drives: if the number of 3368 partition size fields is greater than the maximum number of additional partitions 3369 in the mode page, the second field is used. Otherwise the first field is used. 3370 3371 For Seagate DDS drives the page length must be 8 when no partitions is defined 3372 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3373 is acceptable also to some other old drives and enforced if the first partition 3374 size field is used for the first additional partition size. 3375 3376 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3377 */ 3378 static int partition_tape(struct scsi_tape *STp, int size) 3379 { 3380 int result; 3381 int target_partition; 3382 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3383 int pgo, psd_cnt, psdo; 3384 int psum = PP_MSK_PSUM_MB, units = 0; 3385 unsigned char *bp; 3386 3387 result = read_mode_page(STp, PART_PAGE, 0); 3388 if (result) { 3389 DEBC_printk(STp, "Can't read partition mode page.\n"); 3390 return result; 3391 } 3392 target_partition = 1; 3393 if (size < 0) { 3394 target_partition = 0; 3395 size = -size; 3396 } 3397 3398 /* The mode page is in the buffer. Let's modify it and write it. */ 3399 bp = (STp->buffer)->b_data; 3400 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3401 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3402 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3403 3404 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3405 3406 if (scsi3) { 3407 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3408 if (needs_format && size == 0) { 3409 /* No need to write the mode page when clearing 3410 * partitioning 3411 */ 3412 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3413 result = format_medium(STp, 0); 3414 goto out; 3415 } 3416 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3417 psd_cnt = 2; 3418 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3419 /* Use units scaling for large partitions if the device 3420 * suggests it and no precision lost. Required for IBM 3421 * TS1140/50 drives that don't support MB units. 3422 */ 3423 if (size >= 1000 && (size % 1000) == 0) { 3424 size /= 1000; 3425 psum = PP_MSK_PSUM_UNITS; 3426 units = 9; /* GB */ 3427 } 3428 } 3429 /* Try it anyway if too large to specify in MB */ 3430 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3431 size /= 1000; 3432 psum = PP_MSK_PSUM_UNITS; 3433 units = 9; /* GB */ 3434 } 3435 } 3436 3437 if (size >= 65535 || /* Does not fit into two bytes */ 3438 (target_partition == 0 && psd_cnt < 2)) { 3439 result = -EINVAL; 3440 goto out; 3441 } 3442 3443 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3444 /* The second condition is for HP DDS which use only one partition size 3445 * descriptor 3446 */ 3447 if (target_partition > 0 && 3448 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3449 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3450 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3451 psdo += 2; 3452 } 3453 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3454 3455 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3456 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3457 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3458 3459 if (size == 0) { 3460 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3461 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3462 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3463 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3464 } else { 3465 bp[psdo] = (size >> 8) & 0xff; 3466 bp[psdo + 1] = size & 0xff; 3467 if (target_partition == 0) 3468 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3469 bp[pgo + 3] = 1; 3470 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3471 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3472 DEBC_printk(STp, 3473 "Formatting tape with two partitions (%i = %d MB).\n", 3474 target_partition, units > 0 ? size * 1000 : size); 3475 } 3476 bp[pgo + PP_OFF_PART_UNITS] = 0; 3477 bp[pgo + PP_OFF_RESERVED] = 0; 3478 if (size != 1 || units != 0) { 3479 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3480 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3481 bp[pgo + PP_OFF_PART_UNITS] = units; 3482 } else 3483 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3484 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3485 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3486 3487 result = write_mode_page(STp, PART_PAGE, 1); 3488 3489 if (!result && needs_format) 3490 result = format_medium(STp, 1); 3491 3492 if (result) { 3493 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3494 result = (-EIO); 3495 } 3496 3497 out: 3498 return result; 3499 } 3500 3501 3502 3503 /* The ioctl command */ 3504 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3505 { 3506 int i, cmd_nr, cmd_type, bt; 3507 int retval = 0; 3508 unsigned int blk; 3509 struct scsi_tape *STp = file->private_data; 3510 struct st_modedef *STm; 3511 struct st_partstat *STps; 3512 void __user *p = (void __user *)arg; 3513 3514 if (mutex_lock_interruptible(&STp->lock)) 3515 return -ERESTARTSYS; 3516 3517 DEB( 3518 if (debugging && !STp->in_use) { 3519 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3520 retval = (-EIO); 3521 goto out; 3522 } ) /* end DEB */ 3523 3524 STm = &(STp->modes[STp->current_mode]); 3525 STps = &(STp->ps[STp->partition]); 3526 3527 /* 3528 * If we are in the middle of error recovery, don't let anyone 3529 * else try and use this device. Also, if error recovery fails, it 3530 * may try and take the device offline, in which case all further 3531 * access to the device is prohibited. 3532 */ 3533 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3534 file->f_flags & O_NDELAY); 3535 if (retval) 3536 goto out; 3537 3538 cmd_type = _IOC_TYPE(cmd_in); 3539 cmd_nr = _IOC_NR(cmd_in); 3540 3541 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3542 struct mtop mtc; 3543 3544 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3545 retval = (-EINVAL); 3546 goto out; 3547 } 3548 3549 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3550 if (i) { 3551 retval = (-EFAULT); 3552 goto out; 3553 } 3554 3555 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3556 st_printk(KERN_WARNING, STp, 3557 "MTSETDRVBUFFER only allowed for root.\n"); 3558 retval = (-EPERM); 3559 goto out; 3560 } 3561 if (!STm->defined && 3562 (mtc.mt_op != MTSETDRVBUFFER && 3563 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3564 retval = (-ENXIO); 3565 goto out; 3566 } 3567 3568 if (!STp->pos_unknown) { 3569 3570 if (STps->eof == ST_FM_HIT) { 3571 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3572 mtc.mt_op == MTEOM) { 3573 mtc.mt_count -= 1; 3574 if (STps->drv_file >= 0) 3575 STps->drv_file += 1; 3576 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3577 mtc.mt_count += 1; 3578 if (STps->drv_file >= 0) 3579 STps->drv_file += 1; 3580 } 3581 } 3582 3583 if (mtc.mt_op == MTSEEK) { 3584 /* Old position must be restored if partition will be 3585 changed */ 3586 i = !STp->can_partitions || 3587 (STp->new_partition != STp->partition); 3588 } else { 3589 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3590 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3591 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3592 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3593 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3594 mtc.mt_op == MTCOMPRESSION; 3595 } 3596 i = flush_buffer(STp, i); 3597 if (i < 0) { 3598 retval = i; 3599 goto out; 3600 } 3601 if (STps->rw == ST_WRITING && 3602 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3603 mtc.mt_op == MTSEEK || 3604 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3605 i = st_int_ioctl(STp, MTWEOF, 1); 3606 if (i < 0) { 3607 retval = i; 3608 goto out; 3609 } 3610 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3611 mtc.mt_count++; 3612 STps->rw = ST_IDLE; 3613 } 3614 3615 } else { 3616 /* 3617 * If there was a bus reset, block further access 3618 * to this device. If the user wants to rewind the tape, 3619 * then reset the flag and allow access again. 3620 */ 3621 if (mtc.mt_op != MTREW && 3622 mtc.mt_op != MTOFFL && 3623 mtc.mt_op != MTRETEN && 3624 mtc.mt_op != MTERASE && 3625 mtc.mt_op != MTSEEK && 3626 mtc.mt_op != MTEOM) { 3627 retval = (-EIO); 3628 goto out; 3629 } 3630 reset_state(STp); 3631 /* remove this when the midlevel properly clears was_reset */ 3632 STp->device->was_reset = 0; 3633 } 3634 3635 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3636 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3637 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3638 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3639 3640 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3641 do_door_lock(STp, 0); /* Ignore result! */ 3642 3643 if (mtc.mt_op == MTSETDRVBUFFER && 3644 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3645 retval = st_set_options(STp, mtc.mt_count); 3646 goto out; 3647 } 3648 3649 if (mtc.mt_op == MTSETPART) { 3650 if (!STp->can_partitions || 3651 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3652 retval = (-EINVAL); 3653 goto out; 3654 } 3655 if (mtc.mt_count >= STp->nbr_partitions && 3656 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3657 retval = (-EIO); 3658 goto out; 3659 } 3660 if (mtc.mt_count >= STp->nbr_partitions) { 3661 retval = (-EINVAL); 3662 goto out; 3663 } 3664 STp->new_partition = mtc.mt_count; 3665 retval = 0; 3666 goto out; 3667 } 3668 3669 if (mtc.mt_op == MTMKPART) { 3670 if (!STp->can_partitions) { 3671 retval = (-EINVAL); 3672 goto out; 3673 } 3674 i = do_load_unload(STp, file, 1); 3675 if (i < 0) { 3676 retval = i; 3677 goto out; 3678 } 3679 i = partition_tape(STp, mtc.mt_count); 3680 if (i < 0) { 3681 retval = i; 3682 goto out; 3683 } 3684 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3685 STp->ps[i].rw = ST_IDLE; 3686 STp->ps[i].at_sm = 0; 3687 STp->ps[i].last_block_valid = 0; 3688 } 3689 STp->partition = STp->new_partition = 0; 3690 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3691 STps->drv_block = STps->drv_file = 0; 3692 retval = 0; 3693 goto out; 3694 } 3695 3696 if (mtc.mt_op == MTSEEK) { 3697 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3698 if (!STp->can_partitions) 3699 STp->ps[0].rw = ST_IDLE; 3700 retval = i; 3701 goto out; 3702 } 3703 3704 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3705 retval = do_load_unload(STp, file, 0); 3706 goto out; 3707 } 3708 3709 if (mtc.mt_op == MTLOAD) { 3710 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3711 goto out; 3712 } 3713 3714 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3715 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3716 goto out; 3717 } 3718 3719 if (STp->can_partitions && STp->ready == ST_READY && 3720 (i = switch_partition(STp)) < 0) { 3721 retval = i; 3722 goto out; 3723 } 3724 3725 if (mtc.mt_op == MTCOMPRESSION) 3726 retval = st_compression(STp, (mtc.mt_count & 1)); 3727 else 3728 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3729 goto out; 3730 } 3731 if (!STm->defined) { 3732 retval = (-ENXIO); 3733 goto out; 3734 } 3735 3736 if ((i = flush_buffer(STp, 0)) < 0) { 3737 retval = i; 3738 goto out; 3739 } 3740 if (STp->can_partitions && 3741 (i = switch_partition(STp)) < 0) { 3742 retval = i; 3743 goto out; 3744 } 3745 3746 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3747 struct mtget mt_status; 3748 3749 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3750 retval = (-EINVAL); 3751 goto out; 3752 } 3753 3754 mt_status.mt_type = STp->tape_type; 3755 mt_status.mt_dsreg = 3756 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3757 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3758 mt_status.mt_blkno = STps->drv_block; 3759 mt_status.mt_fileno = STps->drv_file; 3760 if (STp->block_size != 0) { 3761 if (STps->rw == ST_WRITING) 3762 mt_status.mt_blkno += 3763 (STp->buffer)->buffer_bytes / STp->block_size; 3764 else if (STps->rw == ST_READING) 3765 mt_status.mt_blkno -= 3766 ((STp->buffer)->buffer_bytes + 3767 STp->block_size - 1) / STp->block_size; 3768 } 3769 3770 mt_status.mt_gstat = 0; 3771 if (STp->drv_write_prot) 3772 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3773 if (mt_status.mt_blkno == 0) { 3774 if (mt_status.mt_fileno == 0) 3775 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3776 else 3777 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3778 } 3779 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3780 mt_status.mt_resid = STp->partition; 3781 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3782 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3783 else if (STps->eof >= ST_EOM_OK) 3784 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3785 if (STp->density == 1) 3786 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3787 else if (STp->density == 2) 3788 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3789 else if (STp->density == 3) 3790 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3791 if (STp->ready == ST_READY) 3792 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3793 if (STp->ready == ST_NO_TAPE) 3794 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3795 if (STps->at_sm) 3796 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3797 if (STm->do_async_writes || 3798 (STm->do_buffer_writes && STp->block_size != 0) || 3799 STp->drv_buffer != 0) 3800 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3801 if (STp->cleaning_req) 3802 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3803 3804 i = copy_to_user(p, &mt_status, sizeof(struct mtget)); 3805 if (i) { 3806 retval = (-EFAULT); 3807 goto out; 3808 } 3809 3810 STp->recover_reg = 0; /* Clear after read */ 3811 retval = 0; 3812 goto out; 3813 } /* End of MTIOCGET */ 3814 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3815 struct mtpos mt_pos; 3816 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3817 retval = (-EINVAL); 3818 goto out; 3819 } 3820 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3821 retval = i; 3822 goto out; 3823 } 3824 mt_pos.mt_blkno = blk; 3825 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); 3826 if (i) 3827 retval = (-EFAULT); 3828 goto out; 3829 } 3830 mutex_unlock(&STp->lock); 3831 switch (cmd_in) { 3832 case SCSI_IOCTL_GET_IDLUN: 3833 case SCSI_IOCTL_GET_BUS_NUMBER: 3834 break; 3835 default: 3836 if ((cmd_in == SG_IO || 3837 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3838 cmd_in == CDROM_SEND_PACKET) && 3839 !capable(CAP_SYS_RAWIO)) 3840 i = -EPERM; 3841 else 3842 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3843 file->f_mode, cmd_in, p); 3844 if (i != -ENOTTY) 3845 return i; 3846 break; 3847 } 3848 retval = scsi_ioctl(STp->device, cmd_in, p); 3849 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ 3850 STp->rew_at_close = 0; 3851 STp->ready = ST_NO_TAPE; 3852 } 3853 return retval; 3854 3855 out: 3856 mutex_unlock(&STp->lock); 3857 return retval; 3858 } 3859 3860 #ifdef CONFIG_COMPAT 3861 static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 3862 { 3863 struct scsi_tape *STp = file->private_data; 3864 struct scsi_device *sdev = STp->device; 3865 int ret = -ENOIOCTLCMD; 3866 if (sdev->host->hostt->compat_ioctl) { 3867 3868 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 3869 3870 } 3871 return ret; 3872 } 3873 #endif 3874 3875 3876 3877 /* Try to allocate a new tape buffer. Calling function must not hold 3878 dev_arr_lock. */ 3879 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3880 { 3881 struct st_buffer *tb; 3882 3883 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3884 if (!tb) { 3885 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3886 return NULL; 3887 } 3888 tb->frp_segs = 0; 3889 tb->use_sg = max_sg; 3890 tb->dma = need_dma; 3891 tb->buffer_size = 0; 3892 3893 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3894 GFP_KERNEL); 3895 if (!tb->reserved_pages) { 3896 kfree(tb); 3897 return NULL; 3898 } 3899 3900 return tb; 3901 } 3902 3903 3904 /* Try to allocate enough space in the tape buffer */ 3905 #define ST_MAX_ORDER 6 3906 3907 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3908 { 3909 int segs, max_segs, b_size, order, got; 3910 gfp_t priority; 3911 3912 if (new_size <= STbuffer->buffer_size) 3913 return 1; 3914 3915 if (STbuffer->buffer_size <= PAGE_SIZE) 3916 normalize_buffer(STbuffer); /* Avoid extra segment */ 3917 3918 max_segs = STbuffer->use_sg; 3919 3920 priority = GFP_KERNEL | __GFP_NOWARN; 3921 if (need_dma) 3922 priority |= GFP_DMA; 3923 3924 if (STbuffer->cleared) 3925 priority |= __GFP_ZERO; 3926 3927 if (STbuffer->frp_segs) { 3928 order = STbuffer->reserved_page_order; 3929 b_size = PAGE_SIZE << order; 3930 } else { 3931 for (b_size = PAGE_SIZE, order = 0; 3932 order < ST_MAX_ORDER && 3933 max_segs * (PAGE_SIZE << order) < new_size; 3934 order++, b_size *= 2) 3935 ; /* empty */ 3936 STbuffer->reserved_page_order = order; 3937 } 3938 if (max_segs * (PAGE_SIZE << order) < new_size) { 3939 if (order == ST_MAX_ORDER) 3940 return 0; 3941 normalize_buffer(STbuffer); 3942 return enlarge_buffer(STbuffer, new_size, need_dma); 3943 } 3944 3945 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3946 segs < max_segs && got < new_size;) { 3947 struct page *page; 3948 3949 page = alloc_pages(priority, order); 3950 if (!page) { 3951 DEB(STbuffer->buffer_size = got); 3952 normalize_buffer(STbuffer); 3953 return 0; 3954 } 3955 3956 STbuffer->frp_segs += 1; 3957 got += b_size; 3958 STbuffer->buffer_size = got; 3959 STbuffer->reserved_pages[segs] = page; 3960 segs++; 3961 } 3962 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3963 3964 return 1; 3965 } 3966 3967 3968 /* Make sure that no data from previous user is in the internal buffer */ 3969 static void clear_buffer(struct st_buffer * st_bp) 3970 { 3971 int i; 3972 3973 for (i=0; i < st_bp->frp_segs; i++) 3974 memset(page_address(st_bp->reserved_pages[i]), 0, 3975 PAGE_SIZE << st_bp->reserved_page_order); 3976 st_bp->cleared = 1; 3977 } 3978 3979 3980 /* Release the extra buffer */ 3981 static void normalize_buffer(struct st_buffer * STbuffer) 3982 { 3983 int i, order = STbuffer->reserved_page_order; 3984 3985 for (i = 0; i < STbuffer->frp_segs; i++) { 3986 __free_pages(STbuffer->reserved_pages[i], order); 3987 STbuffer->buffer_size -= (PAGE_SIZE << order); 3988 } 3989 STbuffer->frp_segs = 0; 3990 STbuffer->sg_segs = 0; 3991 STbuffer->reserved_page_order = 0; 3992 STbuffer->map_data.offset = 0; 3993 } 3994 3995 3996 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 3997 negative error code. */ 3998 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 3999 { 4000 int i, cnt, res, offset; 4001 int length = PAGE_SIZE << st_bp->reserved_page_order; 4002 4003 for (i = 0, offset = st_bp->buffer_bytes; 4004 i < st_bp->frp_segs && offset >= length; i++) 4005 offset -= length; 4006 if (i == st_bp->frp_segs) { /* Should never happen */ 4007 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4008 return (-EIO); 4009 } 4010 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4011 struct page *page = st_bp->reserved_pages[i]; 4012 cnt = length - offset < do_count ? length - offset : do_count; 4013 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4014 if (res) 4015 return (-EFAULT); 4016 do_count -= cnt; 4017 st_bp->buffer_bytes += cnt; 4018 ubp += cnt; 4019 offset = 0; 4020 } 4021 if (do_count) /* Should never happen */ 4022 return (-EIO); 4023 4024 return 0; 4025 } 4026 4027 4028 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4029 negative error code. */ 4030 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4031 { 4032 int i, cnt, res, offset; 4033 int length = PAGE_SIZE << st_bp->reserved_page_order; 4034 4035 for (i = 0, offset = st_bp->read_pointer; 4036 i < st_bp->frp_segs && offset >= length; i++) 4037 offset -= length; 4038 if (i == st_bp->frp_segs) { /* Should never happen */ 4039 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4040 return (-EIO); 4041 } 4042 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4043 struct page *page = st_bp->reserved_pages[i]; 4044 cnt = length - offset < do_count ? length - offset : do_count; 4045 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4046 if (res) 4047 return (-EFAULT); 4048 do_count -= cnt; 4049 st_bp->buffer_bytes -= cnt; 4050 st_bp->read_pointer += cnt; 4051 ubp += cnt; 4052 offset = 0; 4053 } 4054 if (do_count) /* Should never happen */ 4055 return (-EIO); 4056 4057 return 0; 4058 } 4059 4060 4061 /* Move data towards start of buffer */ 4062 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4063 { 4064 int src_seg, dst_seg, src_offset = 0, dst_offset; 4065 int count, total; 4066 int length = PAGE_SIZE << st_bp->reserved_page_order; 4067 4068 if (offset == 0) 4069 return; 4070 4071 total=st_bp->buffer_bytes - offset; 4072 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4073 src_offset = offset; 4074 if (src_offset < length) 4075 break; 4076 offset -= length; 4077 } 4078 4079 st_bp->buffer_bytes = st_bp->read_pointer = total; 4080 for (dst_seg=dst_offset=0; total > 0; ) { 4081 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4082 struct page *spage = st_bp->reserved_pages[src_seg]; 4083 4084 count = min(length - dst_offset, length - src_offset); 4085 memmove(page_address(dpage) + dst_offset, 4086 page_address(spage) + src_offset, count); 4087 src_offset += count; 4088 if (src_offset >= length) { 4089 src_seg++; 4090 src_offset = 0; 4091 } 4092 dst_offset += count; 4093 if (dst_offset >= length) { 4094 dst_seg++; 4095 dst_offset = 0; 4096 } 4097 total -= count; 4098 } 4099 } 4100 4101 /* Validate the options from command line or module parameters */ 4102 static void validate_options(void) 4103 { 4104 if (buffer_kbs > 0) 4105 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4106 if (max_sg_segs >= ST_FIRST_SG) 4107 st_max_sg_segs = max_sg_segs; 4108 } 4109 4110 #ifndef MODULE 4111 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4112 */ 4113 static int __init st_setup(char *str) 4114 { 4115 int i, len, ints[5]; 4116 char *stp; 4117 4118 stp = get_options(str, ARRAY_SIZE(ints), ints); 4119 4120 if (ints[0] > 0) { 4121 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4122 if (parms[i].val) 4123 *parms[i].val = ints[i + 1]; 4124 } else { 4125 while (stp != NULL) { 4126 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4127 len = strlen(parms[i].name); 4128 if (!strncmp(stp, parms[i].name, len) && 4129 (*(stp + len) == ':' || *(stp + len) == '=')) { 4130 if (parms[i].val) 4131 *parms[i].val = 4132 simple_strtoul(stp + len + 1, NULL, 0); 4133 else 4134 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4135 parms[i].name); 4136 break; 4137 } 4138 } 4139 if (i >= ARRAY_SIZE(parms)) 4140 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4141 stp); 4142 stp = strchr(stp, ','); 4143 if (stp) 4144 stp++; 4145 } 4146 } 4147 4148 validate_options(); 4149 4150 return 1; 4151 } 4152 4153 __setup("st=", st_setup); 4154 4155 #endif 4156 4157 static const struct file_operations st_fops = 4158 { 4159 .owner = THIS_MODULE, 4160 .read = st_read, 4161 .write = st_write, 4162 .unlocked_ioctl = st_ioctl, 4163 #ifdef CONFIG_COMPAT 4164 .compat_ioctl = st_compat_ioctl, 4165 #endif 4166 .open = st_open, 4167 .flush = st_flush, 4168 .release = st_release, 4169 .llseek = noop_llseek, 4170 }; 4171 4172 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4173 { 4174 int i, error; 4175 dev_t cdev_devno; 4176 struct cdev *cdev; 4177 struct device *dev; 4178 struct st_modedef *STm = &(tape->modes[mode]); 4179 char name[10]; 4180 int dev_num = tape->index; 4181 4182 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4183 4184 cdev = cdev_alloc(); 4185 if (!cdev) { 4186 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4187 error = -ENOMEM; 4188 goto out; 4189 } 4190 cdev->owner = THIS_MODULE; 4191 cdev->ops = &st_fops; 4192 STm->cdevs[rew] = cdev; 4193 4194 error = cdev_add(cdev, cdev_devno, 1); 4195 if (error) { 4196 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4197 rew ? "non" : "auto", mode); 4198 pr_err("st%d: Device not attached.\n", dev_num); 4199 goto out_free; 4200 } 4201 4202 i = mode << (4 - ST_NBR_MODE_BITS); 4203 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4204 tape->disk->disk_name, st_formats[i]); 4205 4206 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4207 cdev_devno, &tape->modes[mode], "%s", name); 4208 if (IS_ERR(dev)) { 4209 pr_err("st%d: device_create failed\n", dev_num); 4210 error = PTR_ERR(dev); 4211 goto out_free; 4212 } 4213 4214 STm->devs[rew] = dev; 4215 4216 return 0; 4217 out_free: 4218 cdev_del(STm->cdevs[rew]); 4219 out: 4220 STm->cdevs[rew] = NULL; 4221 STm->devs[rew] = NULL; 4222 return error; 4223 } 4224 4225 static int create_cdevs(struct scsi_tape *tape) 4226 { 4227 int mode, error; 4228 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4229 error = create_one_cdev(tape, mode, 0); 4230 if (error) 4231 return error; 4232 error = create_one_cdev(tape, mode, 1); 4233 if (error) 4234 return error; 4235 } 4236 4237 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4238 &tape->modes[0].devs[0]->kobj, "tape"); 4239 } 4240 4241 static void remove_cdevs(struct scsi_tape *tape) 4242 { 4243 int mode, rew; 4244 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4245 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4246 struct st_modedef *STm = &(tape->modes[mode]); 4247 for (rew = 0; rew < 2; rew++) { 4248 if (STm->cdevs[rew]) 4249 cdev_del(STm->cdevs[rew]); 4250 if (STm->devs[rew]) 4251 device_unregister(STm->devs[rew]); 4252 } 4253 } 4254 } 4255 4256 static int st_probe(struct device *dev) 4257 { 4258 struct scsi_device *SDp = to_scsi_device(dev); 4259 struct gendisk *disk = NULL; 4260 struct scsi_tape *tpnt = NULL; 4261 struct st_modedef *STm; 4262 struct st_partstat *STps; 4263 struct st_buffer *buffer; 4264 int i, error; 4265 char *stp; 4266 4267 if (SDp->type != TYPE_TAPE) 4268 return -ENODEV; 4269 if ((stp = st_incompatible(SDp))) { 4270 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n"); 4271 sdev_printk(KERN_INFO, SDp, 4272 "st: The suggested driver is %s.\n", stp); 4273 return -ENODEV; 4274 } 4275 4276 scsi_autopm_get_device(SDp); 4277 i = queue_max_segments(SDp->request_queue); 4278 if (st_max_sg_segs < i) 4279 i = st_max_sg_segs; 4280 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4281 if (buffer == NULL) { 4282 sdev_printk(KERN_ERR, SDp, 4283 "st: Can't allocate new tape buffer. " 4284 "Device not attached.\n"); 4285 goto out; 4286 } 4287 4288 disk = alloc_disk(1); 4289 if (!disk) { 4290 sdev_printk(KERN_ERR, SDp, 4291 "st: out of memory. Device not attached.\n"); 4292 goto out_buffer_free; 4293 } 4294 4295 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4296 if (tpnt == NULL) { 4297 sdev_printk(KERN_ERR, SDp, 4298 "st: Can't allocate device descriptor.\n"); 4299 goto out_put_disk; 4300 } 4301 kref_init(&tpnt->kref); 4302 tpnt->disk = disk; 4303 disk->private_data = &tpnt->driver; 4304 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4305 * take queue reference that release_disk() expects. */ 4306 if (!blk_get_queue(SDp->request_queue)) 4307 goto out_put_disk; 4308 disk->queue = SDp->request_queue; 4309 tpnt->driver = &st_template; 4310 4311 tpnt->device = SDp; 4312 if (SDp->scsi_level <= 2) 4313 tpnt->tape_type = MT_ISSCSI1; 4314 else 4315 tpnt->tape_type = MT_ISSCSI2; 4316 4317 tpnt->buffer = buffer; 4318 tpnt->buffer->last_SRpnt = NULL; 4319 4320 tpnt->inited = 0; 4321 tpnt->dirty = 0; 4322 tpnt->in_use = 0; 4323 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4324 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4325 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4326 tpnt->density = 0; 4327 tpnt->do_auto_lock = ST_AUTO_LOCK; 4328 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4329 tpnt->can_partitions = 0; 4330 tpnt->two_fm = ST_TWO_FM; 4331 tpnt->fast_mteom = ST_FAST_MTEOM; 4332 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4333 tpnt->sili = ST_SILI; 4334 tpnt->immediate = ST_NOWAIT; 4335 tpnt->immediate_filemark = 0; 4336 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4337 tpnt->partition = 0; 4338 tpnt->new_partition = 0; 4339 tpnt->nbr_partitions = 0; 4340 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4341 tpnt->long_timeout = ST_LONG_TIMEOUT; 4342 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4343 4344 for (i = 0; i < ST_NBR_MODES; i++) { 4345 STm = &(tpnt->modes[i]); 4346 STm->defined = 0; 4347 STm->sysv = ST_SYSV; 4348 STm->defaults_for_writes = 0; 4349 STm->do_async_writes = ST_ASYNC_WRITES; 4350 STm->do_buffer_writes = ST_BUFFER_WRITES; 4351 STm->do_read_ahead = ST_READ_AHEAD; 4352 STm->default_compression = ST_DONT_TOUCH; 4353 STm->default_blksize = (-1); /* No forced size */ 4354 STm->default_density = (-1); /* No forced density */ 4355 STm->tape = tpnt; 4356 } 4357 4358 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4359 STps = &(tpnt->ps[i]); 4360 STps->rw = ST_IDLE; 4361 STps->eof = ST_NOEOF; 4362 STps->at_sm = 0; 4363 STps->last_block_valid = 0; 4364 STps->drv_block = (-1); 4365 STps->drv_file = (-1); 4366 } 4367 4368 tpnt->current_mode = 0; 4369 tpnt->modes[0].defined = 1; 4370 4371 tpnt->density_changed = tpnt->compression_changed = 4372 tpnt->blksize_changed = 0; 4373 mutex_init(&tpnt->lock); 4374 4375 idr_preload(GFP_KERNEL); 4376 spin_lock(&st_index_lock); 4377 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4378 spin_unlock(&st_index_lock); 4379 idr_preload_end(); 4380 if (error < 0) { 4381 pr_warn("st: idr allocation failed: %d\n", error); 4382 goto out_put_queue; 4383 } 4384 tpnt->index = error; 4385 sprintf(disk->disk_name, "st%d", tpnt->index); 4386 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4387 if (tpnt->stats == NULL) { 4388 sdev_printk(KERN_ERR, SDp, 4389 "st: Can't allocate statistics.\n"); 4390 goto out_idr_remove; 4391 } 4392 4393 dev_set_drvdata(dev, tpnt); 4394 4395 4396 error = create_cdevs(tpnt); 4397 if (error) 4398 goto out_remove_devs; 4399 scsi_autopm_put_device(SDp); 4400 4401 sdev_printk(KERN_NOTICE, SDp, 4402 "Attached scsi tape %s\n", tape_name(tpnt)); 4403 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4404 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4405 queue_dma_alignment(SDp->request_queue) + 1); 4406 4407 return 0; 4408 4409 out_remove_devs: 4410 remove_cdevs(tpnt); 4411 kfree(tpnt->stats); 4412 out_idr_remove: 4413 spin_lock(&st_index_lock); 4414 idr_remove(&st_index_idr, tpnt->index); 4415 spin_unlock(&st_index_lock); 4416 out_put_queue: 4417 blk_put_queue(disk->queue); 4418 out_put_disk: 4419 put_disk(disk); 4420 kfree(tpnt); 4421 out_buffer_free: 4422 kfree(buffer); 4423 out: 4424 scsi_autopm_put_device(SDp); 4425 return -ENODEV; 4426 }; 4427 4428 4429 static int st_remove(struct device *dev) 4430 { 4431 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4432 int index = tpnt->index; 4433 4434 scsi_autopm_get_device(to_scsi_device(dev)); 4435 remove_cdevs(tpnt); 4436 4437 mutex_lock(&st_ref_mutex); 4438 kref_put(&tpnt->kref, scsi_tape_release); 4439 mutex_unlock(&st_ref_mutex); 4440 spin_lock(&st_index_lock); 4441 idr_remove(&st_index_idr, index); 4442 spin_unlock(&st_index_lock); 4443 return 0; 4444 } 4445 4446 /** 4447 * scsi_tape_release - Called to free the Scsi_Tape structure 4448 * @kref: pointer to embedded kref 4449 * 4450 * st_ref_mutex must be held entering this routine. Because it is 4451 * called on last put, you should always use the scsi_tape_get() 4452 * scsi_tape_put() helpers which manipulate the semaphore directly 4453 * and never do a direct kref_put(). 4454 **/ 4455 static void scsi_tape_release(struct kref *kref) 4456 { 4457 struct scsi_tape *tpnt = to_scsi_tape(kref); 4458 struct gendisk *disk = tpnt->disk; 4459 4460 tpnt->device = NULL; 4461 4462 if (tpnt->buffer) { 4463 normalize_buffer(tpnt->buffer); 4464 kfree(tpnt->buffer->reserved_pages); 4465 kfree(tpnt->buffer); 4466 } 4467 4468 disk->private_data = NULL; 4469 put_disk(disk); 4470 kfree(tpnt->stats); 4471 kfree(tpnt); 4472 return; 4473 } 4474 4475 static struct class st_sysfs_class = { 4476 .name = "scsi_tape", 4477 .dev_groups = st_dev_groups, 4478 }; 4479 4480 static int __init init_st(void) 4481 { 4482 int err; 4483 4484 validate_options(); 4485 4486 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4487 verstr, st_fixed_buffer_size, st_max_sg_segs); 4488 4489 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4490 if (debugging) { 4491 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4492 debugging); 4493 } 4494 4495 err = class_register(&st_sysfs_class); 4496 if (err) { 4497 pr_err("Unable register sysfs class for SCSI tapes\n"); 4498 return err; 4499 } 4500 4501 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4502 ST_MAX_TAPE_ENTRIES, "st"); 4503 if (err) { 4504 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4505 SCSI_TAPE_MAJOR); 4506 goto err_class; 4507 } 4508 4509 err = scsi_register_driver(&st_template.gendrv); 4510 if (err) 4511 goto err_chrdev; 4512 4513 return 0; 4514 4515 err_chrdev: 4516 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4517 ST_MAX_TAPE_ENTRIES); 4518 err_class: 4519 class_unregister(&st_sysfs_class); 4520 return err; 4521 } 4522 4523 static void __exit exit_st(void) 4524 { 4525 scsi_unregister_driver(&st_template.gendrv); 4526 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4527 ST_MAX_TAPE_ENTRIES); 4528 class_unregister(&st_sysfs_class); 4529 idr_destroy(&st_index_idr); 4530 printk(KERN_INFO "st: Unloaded.\n"); 4531 } 4532 4533 module_init(init_st); 4534 module_exit(exit_st); 4535 4536 4537 /* The sysfs driver interface. Read-only at the moment */ 4538 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4539 { 4540 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4541 } 4542 static DRIVER_ATTR_RO(try_direct_io); 4543 4544 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4545 { 4546 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4547 } 4548 static DRIVER_ATTR_RO(fixed_buffer_size); 4549 4550 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4551 { 4552 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4553 } 4554 static DRIVER_ATTR_RO(max_sg_segs); 4555 4556 static ssize_t version_show(struct device_driver *ddd, char *buf) 4557 { 4558 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4559 } 4560 static DRIVER_ATTR_RO(version); 4561 4562 #if DEBUG 4563 static ssize_t debug_flag_store(struct device_driver *ddp, 4564 const char *buf, size_t count) 4565 { 4566 /* We only care what the first byte of the data is the rest is unused. 4567 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4568 * other values have -EINVAL returned if they are passed in. 4569 */ 4570 if (count > 0) { 4571 if (buf[0] == '0') { 4572 debugging = NO_DEBUG; 4573 return count; 4574 } else if (buf[0] == '1') { 4575 debugging = 1; 4576 return count; 4577 } 4578 } 4579 return -EINVAL; 4580 } 4581 4582 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4583 { 4584 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4585 } 4586 static DRIVER_ATTR_RW(debug_flag); 4587 #endif 4588 4589 static struct attribute *st_drv_attrs[] = { 4590 &driver_attr_try_direct_io.attr, 4591 &driver_attr_fixed_buffer_size.attr, 4592 &driver_attr_max_sg_segs.attr, 4593 &driver_attr_version.attr, 4594 #if DEBUG 4595 &driver_attr_debug_flag.attr, 4596 #endif 4597 NULL, 4598 }; 4599 ATTRIBUTE_GROUPS(st_drv); 4600 4601 /* The sysfs simple class interface */ 4602 static ssize_t 4603 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4604 { 4605 struct st_modedef *STm = dev_get_drvdata(dev); 4606 ssize_t l = 0; 4607 4608 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4609 return l; 4610 } 4611 static DEVICE_ATTR_RO(defined); 4612 4613 static ssize_t 4614 default_blksize_show(struct device *dev, struct device_attribute *attr, 4615 char *buf) 4616 { 4617 struct st_modedef *STm = dev_get_drvdata(dev); 4618 ssize_t l = 0; 4619 4620 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4621 return l; 4622 } 4623 static DEVICE_ATTR_RO(default_blksize); 4624 4625 static ssize_t 4626 default_density_show(struct device *dev, struct device_attribute *attr, 4627 char *buf) 4628 { 4629 struct st_modedef *STm = dev_get_drvdata(dev); 4630 ssize_t l = 0; 4631 char *fmt; 4632 4633 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4634 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4635 return l; 4636 } 4637 static DEVICE_ATTR_RO(default_density); 4638 4639 static ssize_t 4640 default_compression_show(struct device *dev, struct device_attribute *attr, 4641 char *buf) 4642 { 4643 struct st_modedef *STm = dev_get_drvdata(dev); 4644 ssize_t l = 0; 4645 4646 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4647 return l; 4648 } 4649 static DEVICE_ATTR_RO(default_compression); 4650 4651 static ssize_t 4652 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4653 { 4654 struct st_modedef *STm = dev_get_drvdata(dev); 4655 struct scsi_tape *STp = STm->tape; 4656 int options; 4657 ssize_t l = 0; 4658 4659 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4660 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4661 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4662 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4663 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4664 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4665 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4666 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4667 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4668 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4669 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4670 options |= STm->sysv ? MT_ST_SYSV : 0; 4671 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4672 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4673 options |= STp->sili ? MT_ST_SILI : 0; 4674 4675 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4676 return l; 4677 } 4678 static DEVICE_ATTR_RO(options); 4679 4680 /* Support for tape stats */ 4681 4682 /** 4683 * read_cnt_show - return read count - count of reads made from tape drive 4684 * @dev: struct device 4685 * @attr: attribute structure 4686 * @buf: buffer to return formatted data in 4687 */ 4688 static ssize_t read_cnt_show(struct device *dev, 4689 struct device_attribute *attr, char *buf) 4690 { 4691 struct st_modedef *STm = dev_get_drvdata(dev); 4692 4693 return sprintf(buf, "%lld", 4694 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4695 } 4696 static DEVICE_ATTR_RO(read_cnt); 4697 4698 /** 4699 * read_byte_cnt_show - return read byte count - tape drives 4700 * may use blocks less than 512 bytes this gives the raw byte count of 4701 * of data read from the tape drive. 4702 * @dev: struct device 4703 * @attr: attribute structure 4704 * @buf: buffer to return formatted data in 4705 */ 4706 static ssize_t read_byte_cnt_show(struct device *dev, 4707 struct device_attribute *attr, char *buf) 4708 { 4709 struct st_modedef *STm = dev_get_drvdata(dev); 4710 4711 return sprintf(buf, "%lld", 4712 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4713 } 4714 static DEVICE_ATTR_RO(read_byte_cnt); 4715 4716 /** 4717 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4718 * @dev: struct device 4719 * @attr: attribute structure 4720 * @buf: buffer to return formatted data in 4721 */ 4722 static ssize_t read_ns_show(struct device *dev, 4723 struct device_attribute *attr, char *buf) 4724 { 4725 struct st_modedef *STm = dev_get_drvdata(dev); 4726 4727 return sprintf(buf, "%lld", 4728 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4729 } 4730 static DEVICE_ATTR_RO(read_ns); 4731 4732 /** 4733 * write_cnt_show - write count - number of user calls 4734 * to write(2) that have written data to tape. 4735 * @dev: struct device 4736 * @attr: attribute structure 4737 * @buf: buffer to return formatted data in 4738 */ 4739 static ssize_t write_cnt_show(struct device *dev, 4740 struct device_attribute *attr, char *buf) 4741 { 4742 struct st_modedef *STm = dev_get_drvdata(dev); 4743 4744 return sprintf(buf, "%lld", 4745 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4746 } 4747 static DEVICE_ATTR_RO(write_cnt); 4748 4749 /** 4750 * write_byte_cnt_show - write byte count - raw count of 4751 * bytes written to tape. 4752 * @dev: struct device 4753 * @attr: attribute structure 4754 * @buf: buffer to return formatted data in 4755 */ 4756 static ssize_t write_byte_cnt_show(struct device *dev, 4757 struct device_attribute *attr, char *buf) 4758 { 4759 struct st_modedef *STm = dev_get_drvdata(dev); 4760 4761 return sprintf(buf, "%lld", 4762 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4763 } 4764 static DEVICE_ATTR_RO(write_byte_cnt); 4765 4766 /** 4767 * write_ns_show - write ns - number of nanoseconds waiting on write 4768 * requests to complete. 4769 * @dev: struct device 4770 * @attr: attribute structure 4771 * @buf: buffer to return formatted data in 4772 */ 4773 static ssize_t write_ns_show(struct device *dev, 4774 struct device_attribute *attr, char *buf) 4775 { 4776 struct st_modedef *STm = dev_get_drvdata(dev); 4777 4778 return sprintf(buf, "%lld", 4779 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4780 } 4781 static DEVICE_ATTR_RO(write_ns); 4782 4783 /** 4784 * in_flight_show - number of I/Os currently in flight - 4785 * in most cases this will be either 0 or 1. It may be higher if someone 4786 * has also issued other SCSI commands such as via an ioctl. 4787 * @dev: struct device 4788 * @attr: attribute structure 4789 * @buf: buffer to return formatted data in 4790 */ 4791 static ssize_t in_flight_show(struct device *dev, 4792 struct device_attribute *attr, char *buf) 4793 { 4794 struct st_modedef *STm = dev_get_drvdata(dev); 4795 4796 return sprintf(buf, "%lld", 4797 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4798 } 4799 static DEVICE_ATTR_RO(in_flight); 4800 4801 /** 4802 * io_ns_show - io wait ns - this is the number of ns spent 4803 * waiting on all I/O to complete. This includes tape movement commands 4804 * such as rewinding, seeking to end of file or tape, it also includes 4805 * read and write. To determine the time spent on tape movement 4806 * subtract the read and write ns from this value. 4807 * @dev: struct device 4808 * @attr: attribute structure 4809 * @buf: buffer to return formatted data in 4810 */ 4811 static ssize_t io_ns_show(struct device *dev, 4812 struct device_attribute *attr, char *buf) 4813 { 4814 struct st_modedef *STm = dev_get_drvdata(dev); 4815 4816 return sprintf(buf, "%lld", 4817 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4818 } 4819 static DEVICE_ATTR_RO(io_ns); 4820 4821 /** 4822 * other_cnt_show - other io count - this is the number of 4823 * I/O requests other than read and write requests. 4824 * Typically these are tape movement requests but will include driver 4825 * tape movement. This includes only requests issued by the st driver. 4826 * @dev: struct device 4827 * @attr: attribute structure 4828 * @buf: buffer to return formatted data in 4829 */ 4830 static ssize_t other_cnt_show(struct device *dev, 4831 struct device_attribute *attr, char *buf) 4832 { 4833 struct st_modedef *STm = dev_get_drvdata(dev); 4834 4835 return sprintf(buf, "%lld", 4836 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4837 } 4838 static DEVICE_ATTR_RO(other_cnt); 4839 4840 /** 4841 * resid_cnt_show - A count of the number of times we get a residual 4842 * count - this should indicate someone issuing reads larger than the 4843 * block size on tape. 4844 * @dev: struct device 4845 * @attr: attribute structure 4846 * @buf: buffer to return formatted data in 4847 */ 4848 static ssize_t resid_cnt_show(struct device *dev, 4849 struct device_attribute *attr, char *buf) 4850 { 4851 struct st_modedef *STm = dev_get_drvdata(dev); 4852 4853 return sprintf(buf, "%lld", 4854 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4855 } 4856 static DEVICE_ATTR_RO(resid_cnt); 4857 4858 static struct attribute *st_dev_attrs[] = { 4859 &dev_attr_defined.attr, 4860 &dev_attr_default_blksize.attr, 4861 &dev_attr_default_density.attr, 4862 &dev_attr_default_compression.attr, 4863 &dev_attr_options.attr, 4864 NULL, 4865 }; 4866 4867 static struct attribute *st_stats_attrs[] = { 4868 &dev_attr_read_cnt.attr, 4869 &dev_attr_read_byte_cnt.attr, 4870 &dev_attr_read_ns.attr, 4871 &dev_attr_write_cnt.attr, 4872 &dev_attr_write_byte_cnt.attr, 4873 &dev_attr_write_ns.attr, 4874 &dev_attr_in_flight.attr, 4875 &dev_attr_io_ns.attr, 4876 &dev_attr_other_cnt.attr, 4877 &dev_attr_resid_cnt.attr, 4878 NULL, 4879 }; 4880 4881 static struct attribute_group stats_group = { 4882 .name = "stats", 4883 .attrs = st_stats_attrs, 4884 }; 4885 4886 static struct attribute_group st_group = { 4887 .attrs = st_dev_attrs, 4888 }; 4889 4890 static const struct attribute_group *st_dev_groups[] = { 4891 &st_group, 4892 &stats_group, 4893 NULL, 4894 }; 4895 4896 /* The following functions may be useful for a larger audience. */ 4897 static int sgl_map_user_pages(struct st_buffer *STbp, 4898 const unsigned int max_pages, unsigned long uaddr, 4899 size_t count, int rw) 4900 { 4901 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4902 unsigned long start = uaddr >> PAGE_SHIFT; 4903 const int nr_pages = end - start; 4904 int res, i, j; 4905 struct page **pages; 4906 struct rq_map_data *mdata = &STbp->map_data; 4907 4908 /* User attempted Overflow! */ 4909 if ((uaddr + count) < uaddr) 4910 return -EINVAL; 4911 4912 /* Too big */ 4913 if (nr_pages > max_pages) 4914 return -ENOMEM; 4915 4916 /* Hmm? */ 4917 if (count == 0) 4918 return 0; 4919 4920 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4921 if (pages == NULL) 4922 return -ENOMEM; 4923 4924 /* Try to fault in all of the necessary pages */ 4925 /* rw==READ means read from drive, write into memory area */ 4926 res = get_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0, 4927 pages); 4928 4929 /* Errors and no page mapped should return here */ 4930 if (res < nr_pages) 4931 goto out_unmap; 4932 4933 for (i=0; i < nr_pages; i++) { 4934 /* FIXME: flush superflous for rw==READ, 4935 * probably wrong function for rw==WRITE 4936 */ 4937 flush_dcache_page(pages[i]); 4938 } 4939 4940 mdata->offset = uaddr & ~PAGE_MASK; 4941 STbp->mapped_pages = pages; 4942 4943 return nr_pages; 4944 out_unmap: 4945 if (res > 0) { 4946 for (j=0; j < res; j++) 4947 put_page(pages[j]); 4948 res = 0; 4949 } 4950 kfree(pages); 4951 return res; 4952 } 4953 4954 4955 /* And unmap them... */ 4956 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4957 const unsigned int nr_pages, int dirtied) 4958 { 4959 int i; 4960 4961 for (i=0; i < nr_pages; i++) { 4962 struct page *page = STbp->mapped_pages[i]; 4963 4964 if (dirtied) 4965 SetPageDirty(page); 4966 /* FIXME: cache flush missing for rw==READ 4967 * FIXME: call the correct reference counting function 4968 */ 4969 put_page(page); 4970 } 4971 kfree(STbp->mapped_pages); 4972 STbp->mapped_pages = NULL; 4973 4974 return 0; 4975 } 4976