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.rst 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/compat.h> 26 #include <linux/fs.h> 27 #include <linux/kernel.h> 28 #include <linux/sched/signal.h> 29 #include <linux/mm.h> 30 #include <linux/init.h> 31 #include <linux/string.h> 32 #include <linux/slab.h> 33 #include <linux/errno.h> 34 #include <linux/mtio.h> 35 #include <linux/cdrom.h> 36 #include <linux/ioctl.h> 37 #include <linux/fcntl.h> 38 #include <linux/spinlock.h> 39 #include <linux/blkdev.h> 40 #include <linux/moduleparam.h> 41 #include <linux/cdev.h> 42 #include <linux/idr.h> 43 #include <linux/delay.h> 44 #include <linux/mutex.h> 45 46 #include <linux/uaccess.h> 47 #include <asm/dma.h> 48 #include <asm/unaligned.h> 49 50 #include <scsi/scsi.h> 51 #include <scsi/scsi_dbg.h> 52 #include <scsi/scsi_device.h> 53 #include <scsi/scsi_driver.h> 54 #include <scsi/scsi_eh.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_ioctl.h> 57 #include <scsi/sg.h> 58 59 60 /* The driver prints some debugging information on the console if DEBUG 61 is defined and non-zero. */ 62 #define DEBUG 1 63 #define NO_DEBUG 0 64 65 #define ST_DEB_MSG KERN_NOTICE 66 #if DEBUG 67 /* The message level for the debug messages is currently set to KERN_NOTICE 68 so that people can easily see the messages. Later when the debugging messages 69 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 70 #define DEB(a) a 71 #define DEBC(a) if (debugging) { a ; } 72 #else 73 #define DEB(a) 74 #define DEBC(a) 75 #endif 76 77 #define ST_KILOBYTE 1024 78 79 #include "st_options.h" 80 #include "st.h" 81 82 static int buffer_kbs; 83 static int max_sg_segs; 84 static int try_direct_io = TRY_DIRECT_IO; 85 static int try_rdio = 1; 86 static int try_wdio = 1; 87 static int debug_flag; 88 89 static struct class st_sysfs_class; 90 static const struct attribute_group *st_dev_groups[]; 91 static const struct attribute_group *st_drv_groups[]; 92 93 MODULE_AUTHOR("Kai Makisara"); 94 MODULE_DESCRIPTION("SCSI tape (st) driver"); 95 MODULE_LICENSE("GPL"); 96 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 97 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 98 99 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 100 * of sysfs parameters (which module_param doesn't yet support). 101 * Sysfs parameters defined explicitly later. 102 */ 103 module_param_named(buffer_kbs, buffer_kbs, int, 0); 104 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 105 module_param_named(max_sg_segs, max_sg_segs, int, 0); 106 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 107 module_param_named(try_direct_io, try_direct_io, int, 0); 108 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 109 module_param_named(debug_flag, debug_flag, int, 0); 110 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 111 112 113 /* Extra parameters for testing */ 114 module_param_named(try_rdio, try_rdio, int, 0); 115 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 116 module_param_named(try_wdio, try_wdio, int, 0); 117 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 118 119 #ifndef MODULE 120 static int write_threshold_kbs; /* retained for compatibility */ 121 static struct st_dev_parm { 122 char *name; 123 int *val; 124 } parms[] __initdata = { 125 { 126 "buffer_kbs", &buffer_kbs 127 }, 128 { /* Retained for compatibility with 2.4 */ 129 "write_threshold_kbs", &write_threshold_kbs 130 }, 131 { 132 "max_sg_segs", NULL 133 }, 134 { 135 "try_direct_io", &try_direct_io 136 }, 137 { 138 "debug_flag", &debug_flag 139 } 140 }; 141 #endif 142 143 /* Restrict the number of modes so that names for all are assigned */ 144 #if ST_NBR_MODES > 16 145 #error "Maximum number of modes is 16" 146 #endif 147 /* Bit reversed order to get same names for same minors with all 148 mode counts */ 149 static const char *st_formats[] = { 150 "", "r", "k", "s", "l", "t", "o", "u", 151 "m", "v", "p", "x", "a", "y", "q", "z"}; 152 153 /* The default definitions have been moved to st_options.h */ 154 155 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 156 157 /* The buffer size should fit into the 24 bits for length in the 158 6-byte SCSI read and write commands. */ 159 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 160 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 161 #endif 162 163 static int debugging = DEBUG; 164 165 #define MAX_RETRIES 0 166 #define MAX_WRITE_RETRIES 0 167 #define MAX_READY_RETRIES 0 168 #define NO_TAPE NOT_READY 169 170 #define ST_TIMEOUT (900 * HZ) 171 #define ST_LONG_TIMEOUT (14000 * HZ) 172 173 /* Remove mode bits and auto-rewind bit (7) */ 174 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 175 (iminor(x) & ((1 << ST_MODE_SHIFT)-1))) 176 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 177 178 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 179 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 180 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 181 182 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 183 24 bits) */ 184 #define SET_DENS_AND_BLK 0x10001 185 186 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 187 static int st_max_sg_segs = ST_MAX_SG; 188 189 static int modes_defined; 190 191 static int enlarge_buffer(struct st_buffer *, int, int); 192 static void clear_buffer(struct st_buffer *); 193 static void normalize_buffer(struct st_buffer *); 194 static int append_to_buffer(const char __user *, struct st_buffer *, int); 195 static int from_buffer(struct st_buffer *, char __user *, int); 196 static void move_buffer_data(struct st_buffer *, int); 197 198 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 199 unsigned long, size_t, int); 200 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 201 202 static int st_probe(struct device *); 203 static int st_remove(struct device *); 204 205 static struct scsi_driver st_template = { 206 .gendrv = { 207 .name = "st", 208 .owner = THIS_MODULE, 209 .probe = st_probe, 210 .remove = st_remove, 211 .groups = st_drv_groups, 212 }, 213 }; 214 215 static int st_compression(struct scsi_tape *, int); 216 217 static int find_partition(struct scsi_tape *); 218 static int switch_partition(struct scsi_tape *); 219 220 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 221 222 static void scsi_tape_release(struct kref *); 223 224 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 225 226 static DEFINE_MUTEX(st_ref_mutex); 227 static DEFINE_SPINLOCK(st_index_lock); 228 static DEFINE_SPINLOCK(st_use_lock); 229 static DEFINE_IDR(st_index_idr); 230 231 232 233 #ifndef SIGS_FROM_OSST 234 #define SIGS_FROM_OSST \ 235 {"OnStream", "SC-", "", "osst"}, \ 236 {"OnStream", "DI-", "", "osst"}, \ 237 {"OnStream", "DP-", "", "osst"}, \ 238 {"OnStream", "USB", "", "osst"}, \ 239 {"OnStream", "FW-", "", "osst"} 240 #endif 241 242 static struct scsi_tape *scsi_tape_get(int dev) 243 { 244 struct scsi_tape *STp = NULL; 245 246 mutex_lock(&st_ref_mutex); 247 spin_lock(&st_index_lock); 248 249 STp = idr_find(&st_index_idr, dev); 250 if (!STp) goto out; 251 252 kref_get(&STp->kref); 253 254 if (!STp->device) 255 goto out_put; 256 257 if (scsi_device_get(STp->device)) 258 goto out_put; 259 260 goto out; 261 262 out_put: 263 kref_put(&STp->kref, scsi_tape_release); 264 STp = NULL; 265 out: 266 spin_unlock(&st_index_lock); 267 mutex_unlock(&st_ref_mutex); 268 return STp; 269 } 270 271 static void scsi_tape_put(struct scsi_tape *STp) 272 { 273 struct scsi_device *sdev = STp->device; 274 275 mutex_lock(&st_ref_mutex); 276 kref_put(&STp->kref, scsi_tape_release); 277 scsi_device_put(sdev); 278 mutex_unlock(&st_ref_mutex); 279 } 280 281 struct st_reject_data { 282 char *vendor; 283 char *model; 284 char *rev; 285 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 286 }; 287 288 static struct st_reject_data reject_list[] = { 289 /* {"XXX", "Yy-", "", NULL}, example */ 290 SIGS_FROM_OSST, 291 {NULL, }}; 292 293 /* If the device signature is on the list of incompatible drives, the 294 function returns a pointer to the name of the correct driver (if known) */ 295 static char * st_incompatible(struct scsi_device* SDp) 296 { 297 struct st_reject_data *rp; 298 299 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 300 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 301 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 302 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 303 if (rp->driver_hint) 304 return rp->driver_hint; 305 else 306 return "unknown"; 307 } 308 return NULL; 309 } 310 311 312 static inline char *tape_name(struct scsi_tape *tape) 313 { 314 return tape->disk->disk_name; 315 } 316 317 #define st_printk(prefix, t, fmt, a...) \ 318 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) 319 #ifdef DEBUG 320 #define DEBC_printk(t, fmt, a...) \ 321 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 322 #else 323 #define DEBC_printk(t, fmt, a...) 324 #endif 325 326 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 327 { 328 const u8 *ucp; 329 const u8 *sense = SRpnt->sense; 330 331 s->have_sense = scsi_normalize_sense(SRpnt->sense, 332 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 333 s->flags = 0; 334 335 if (s->have_sense) { 336 s->deferred = 0; 337 s->remainder_valid = 338 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 339 switch (sense[0] & 0x7f) { 340 case 0x71: 341 s->deferred = 1; 342 fallthrough; 343 case 0x70: 344 s->fixed_format = 1; 345 s->flags = sense[2] & 0xe0; 346 break; 347 case 0x73: 348 s->deferred = 1; 349 fallthrough; 350 case 0x72: 351 s->fixed_format = 0; 352 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 353 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 354 break; 355 } 356 } 357 } 358 359 360 /* Convert the result to success code */ 361 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 362 { 363 int result = SRpnt->result; 364 u8 scode; 365 DEB(const char *stp;) 366 char *name = tape_name(STp); 367 struct st_cmdstatus *cmdstatp; 368 369 if (!result) 370 return 0; 371 372 cmdstatp = &STp->buffer->cmdstat; 373 st_analyze_sense(SRpnt, cmdstatp); 374 375 if (cmdstatp->have_sense) 376 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 377 else 378 scode = 0; 379 380 DEB( 381 if (debugging) { 382 st_printk(ST_DEB_MSG, STp, 383 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 384 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 385 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 386 if (cmdstatp->have_sense) 387 __scsi_print_sense(STp->device, name, 388 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 389 } ) /* end DEB */ 390 if (!debugging) { /* Abnormal conditions for tape */ 391 if (!cmdstatp->have_sense) 392 st_printk(KERN_WARNING, STp, 393 "Error %x (driver bt 0x%x, host bt 0x%x).\n", 394 result, driver_byte(result), host_byte(result)); 395 else if (cmdstatp->have_sense && 396 scode != NO_SENSE && 397 scode != RECOVERED_ERROR && 398 /* scode != UNIT_ATTENTION && */ 399 scode != BLANK_CHECK && 400 scode != VOLUME_OVERFLOW && 401 SRpnt->cmd[0] != MODE_SENSE && 402 SRpnt->cmd[0] != TEST_UNIT_READY) { 403 404 __scsi_print_sense(STp->device, name, 405 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 406 } 407 } 408 409 if (cmdstatp->fixed_format && 410 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 411 if (STp->cln_sense_value) 412 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 413 STp->cln_sense_mask) == STp->cln_sense_value); 414 else 415 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 416 STp->cln_sense_mask) != 0); 417 } 418 if (cmdstatp->have_sense && 419 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 420 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 421 422 STp->pos_unknown |= STp->device->was_reset; 423 424 if (cmdstatp->have_sense && 425 scode == RECOVERED_ERROR 426 #if ST_RECOVERED_WRITE_FATAL 427 && SRpnt->cmd[0] != WRITE_6 428 && SRpnt->cmd[0] != WRITE_FILEMARKS 429 #endif 430 ) { 431 STp->recover_count++; 432 STp->recover_reg++; 433 434 DEB( 435 if (debugging) { 436 if (SRpnt->cmd[0] == READ_6) 437 stp = "read"; 438 else if (SRpnt->cmd[0] == WRITE_6) 439 stp = "write"; 440 else 441 stp = "ioctl"; 442 st_printk(ST_DEB_MSG, STp, 443 "Recovered %s error (%d).\n", 444 stp, STp->recover_count); 445 } ) /* end DEB */ 446 447 if (cmdstatp->flags == 0) 448 return 0; 449 } 450 return (-EIO); 451 } 452 453 static struct st_request *st_allocate_request(struct scsi_tape *stp) 454 { 455 struct st_request *streq; 456 457 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 458 if (streq) 459 streq->stp = stp; 460 else { 461 st_printk(KERN_ERR, stp, 462 "Can't get SCSI request.\n"); 463 if (signal_pending(current)) 464 stp->buffer->syscall_result = -EINTR; 465 else 466 stp->buffer->syscall_result = -EBUSY; 467 } 468 469 return streq; 470 } 471 472 static void st_release_request(struct st_request *streq) 473 { 474 kfree(streq); 475 } 476 477 static void st_do_stats(struct scsi_tape *STp, struct request *req) 478 { 479 ktime_t now; 480 481 now = ktime_get(); 482 if (scsi_req(req)->cmd[0] == WRITE_6) { 483 now = ktime_sub(now, STp->stats->write_time); 484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 485 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 486 atomic64_inc(&STp->stats->write_cnt); 487 if (scsi_req(req)->result) { 488 atomic64_add(atomic_read(&STp->stats->last_write_size) 489 - STp->buffer->cmdstat.residual, 490 &STp->stats->write_byte_cnt); 491 if (STp->buffer->cmdstat.residual > 0) 492 atomic64_inc(&STp->stats->resid_cnt); 493 } else 494 atomic64_add(atomic_read(&STp->stats->last_write_size), 495 &STp->stats->write_byte_cnt); 496 } else if (scsi_req(req)->cmd[0] == READ_6) { 497 now = ktime_sub(now, STp->stats->read_time); 498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 499 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 500 atomic64_inc(&STp->stats->read_cnt); 501 if (scsi_req(req)->result) { 502 atomic64_add(atomic_read(&STp->stats->last_read_size) 503 - STp->buffer->cmdstat.residual, 504 &STp->stats->read_byte_cnt); 505 if (STp->buffer->cmdstat.residual > 0) 506 atomic64_inc(&STp->stats->resid_cnt); 507 } else 508 atomic64_add(atomic_read(&STp->stats->last_read_size), 509 &STp->stats->read_byte_cnt); 510 } else { 511 now = ktime_sub(now, STp->stats->other_time); 512 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 513 atomic64_inc(&STp->stats->other_cnt); 514 } 515 atomic64_dec(&STp->stats->in_flight); 516 } 517 518 static void st_scsi_execute_end(struct request *req, blk_status_t status) 519 { 520 struct st_request *SRpnt = req->end_io_data; 521 struct scsi_request *rq = scsi_req(req); 522 struct scsi_tape *STp = SRpnt->stp; 523 struct bio *tmp; 524 525 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result; 526 STp->buffer->cmdstat.residual = rq->resid_len; 527 528 st_do_stats(STp, req); 529 530 tmp = SRpnt->bio; 531 if (rq->sense_len) 532 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE); 533 if (SRpnt->waiting) 534 complete(SRpnt->waiting); 535 536 blk_rq_unmap_user(tmp); 537 blk_put_request(req); 538 } 539 540 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 541 int data_direction, void *buffer, unsigned bufflen, 542 int timeout, int retries) 543 { 544 struct request *req; 545 struct scsi_request *rq; 546 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 547 int err = 0; 548 struct scsi_tape *STp = SRpnt->stp; 549 550 req = blk_get_request(SRpnt->stp->device->request_queue, 551 data_direction == DMA_TO_DEVICE ? 552 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); 553 if (IS_ERR(req)) 554 return DRIVER_ERROR << 24; 555 rq = scsi_req(req); 556 req->rq_flags |= RQF_QUIET; 557 558 mdata->null_mapped = 1; 559 560 if (bufflen) { 561 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 562 GFP_KERNEL); 563 if (err) { 564 blk_put_request(req); 565 return DRIVER_ERROR << 24; 566 } 567 } 568 569 atomic64_inc(&STp->stats->in_flight); 570 if (cmd[0] == WRITE_6) { 571 atomic_set(&STp->stats->last_write_size, bufflen); 572 STp->stats->write_time = ktime_get(); 573 } else if (cmd[0] == READ_6) { 574 atomic_set(&STp->stats->last_read_size, bufflen); 575 STp->stats->read_time = ktime_get(); 576 } else { 577 STp->stats->other_time = ktime_get(); 578 } 579 580 SRpnt->bio = req->bio; 581 rq->cmd_len = COMMAND_SIZE(cmd[0]); 582 memset(rq->cmd, 0, BLK_MAX_CDB); 583 memcpy(rq->cmd, cmd, rq->cmd_len); 584 req->timeout = timeout; 585 rq->retries = retries; 586 req->end_io_data = SRpnt; 587 588 blk_execute_rq_nowait(NULL, req, 1, st_scsi_execute_end); 589 return 0; 590 } 591 592 /* Do the scsi command. Waits until command performed if do_wait is true. 593 Otherwise write_behind_check() is used to check that the command 594 has finished. */ 595 static struct st_request * 596 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 597 int bytes, int direction, int timeout, int retries, int do_wait) 598 { 599 struct completion *waiting; 600 struct rq_map_data *mdata = &STp->buffer->map_data; 601 int ret; 602 603 /* if async, make sure there's no command outstanding */ 604 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 605 st_printk(KERN_ERR, STp, 606 "Async command already active.\n"); 607 if (signal_pending(current)) 608 (STp->buffer)->syscall_result = (-EINTR); 609 else 610 (STp->buffer)->syscall_result = (-EBUSY); 611 return NULL; 612 } 613 614 if (!SRpnt) { 615 SRpnt = st_allocate_request(STp); 616 if (!SRpnt) 617 return NULL; 618 } 619 620 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 621 which IO is outstanding. It's nulled out when the IO completes. */ 622 if (!do_wait) 623 (STp->buffer)->last_SRpnt = SRpnt; 624 625 waiting = &STp->wait; 626 init_completion(waiting); 627 SRpnt->waiting = waiting; 628 629 if (STp->buffer->do_dio) { 630 mdata->page_order = 0; 631 mdata->nr_entries = STp->buffer->sg_segs; 632 mdata->pages = STp->buffer->mapped_pages; 633 } else { 634 mdata->page_order = STp->buffer->reserved_page_order; 635 mdata->nr_entries = 636 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 637 mdata->pages = STp->buffer->reserved_pages; 638 mdata->offset = 0; 639 } 640 641 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 642 STp->buffer->cmdstat.have_sense = 0; 643 STp->buffer->syscall_result = 0; 644 645 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 646 retries); 647 if (ret) { 648 /* could not allocate the buffer or request was too large */ 649 (STp->buffer)->syscall_result = (-EBUSY); 650 (STp->buffer)->last_SRpnt = NULL; 651 } else if (do_wait) { 652 wait_for_completion(waiting); 653 SRpnt->waiting = NULL; 654 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 655 } 656 657 return SRpnt; 658 } 659 660 661 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 662 write has been correct but EOM early warning reached, -EIO if write ended in 663 error or zero if write successful. Asynchronous writes are used only in 664 variable block mode. */ 665 static int write_behind_check(struct scsi_tape * STp) 666 { 667 int retval = 0; 668 struct st_buffer *STbuffer; 669 struct st_partstat *STps; 670 struct st_cmdstatus *cmdstatp; 671 struct st_request *SRpnt; 672 673 STbuffer = STp->buffer; 674 if (!STbuffer->writing) 675 return 0; 676 677 DEB( 678 if (STp->write_pending) 679 STp->nbr_waits++; 680 else 681 STp->nbr_finished++; 682 ) /* end DEB */ 683 684 wait_for_completion(&(STp->wait)); 685 SRpnt = STbuffer->last_SRpnt; 686 STbuffer->last_SRpnt = NULL; 687 SRpnt->waiting = NULL; 688 689 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 690 st_release_request(SRpnt); 691 692 STbuffer->buffer_bytes -= STbuffer->writing; 693 STps = &(STp->ps[STp->partition]); 694 if (STps->drv_block >= 0) { 695 if (STp->block_size == 0) 696 STps->drv_block++; 697 else 698 STps->drv_block += STbuffer->writing / STp->block_size; 699 } 700 701 cmdstatp = &STbuffer->cmdstat; 702 if (STbuffer->syscall_result) { 703 retval = -EIO; 704 if (cmdstatp->have_sense && !cmdstatp->deferred && 705 (cmdstatp->flags & SENSE_EOM) && 706 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 707 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 708 /* EOM at write-behind, has all data been written? */ 709 if (!cmdstatp->remainder_valid || 710 cmdstatp->uremainder64 == 0) 711 retval = -ENOSPC; 712 } 713 if (retval == -EIO) 714 STps->drv_block = -1; 715 } 716 STbuffer->writing = 0; 717 718 DEB(if (debugging && retval) 719 st_printk(ST_DEB_MSG, STp, 720 "Async write error %x, return value %d.\n", 721 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 722 723 return retval; 724 } 725 726 727 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 728 it messes up the block number). */ 729 static int cross_eof(struct scsi_tape * STp, int forward) 730 { 731 struct st_request *SRpnt; 732 unsigned char cmd[MAX_COMMAND_SIZE]; 733 734 cmd[0] = SPACE; 735 cmd[1] = 0x01; /* Space FileMarks */ 736 if (forward) { 737 cmd[2] = cmd[3] = 0; 738 cmd[4] = 1; 739 } else 740 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 741 cmd[5] = 0; 742 743 DEBC_printk(STp, "Stepping over filemark %s.\n", 744 forward ? "forward" : "backward"); 745 746 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 747 STp->device->request_queue->rq_timeout, 748 MAX_RETRIES, 1); 749 if (!SRpnt) 750 return (STp->buffer)->syscall_result; 751 752 st_release_request(SRpnt); 753 SRpnt = NULL; 754 755 if ((STp->buffer)->cmdstat.midlevel_result != 0) 756 st_printk(KERN_ERR, STp, 757 "Stepping over filemark %s failed.\n", 758 forward ? "forward" : "backward"); 759 760 return (STp->buffer)->syscall_result; 761 } 762 763 764 /* Flush the write buffer (never need to write if variable blocksize). */ 765 static int st_flush_write_buffer(struct scsi_tape * STp) 766 { 767 int transfer, blks; 768 int result; 769 unsigned char cmd[MAX_COMMAND_SIZE]; 770 struct st_request *SRpnt; 771 struct st_partstat *STps; 772 773 result = write_behind_check(STp); 774 if (result) 775 return result; 776 777 result = 0; 778 if (STp->dirty == 1) { 779 780 transfer = STp->buffer->buffer_bytes; 781 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 782 783 memset(cmd, 0, MAX_COMMAND_SIZE); 784 cmd[0] = WRITE_6; 785 cmd[1] = 1; 786 blks = transfer / STp->block_size; 787 cmd[2] = blks >> 16; 788 cmd[3] = blks >> 8; 789 cmd[4] = blks; 790 791 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 792 STp->device->request_queue->rq_timeout, 793 MAX_WRITE_RETRIES, 1); 794 if (!SRpnt) 795 return (STp->buffer)->syscall_result; 796 797 STps = &(STp->ps[STp->partition]); 798 if ((STp->buffer)->syscall_result != 0) { 799 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 800 801 if (cmdstatp->have_sense && !cmdstatp->deferred && 802 (cmdstatp->flags & SENSE_EOM) && 803 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 804 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 805 (!cmdstatp->remainder_valid || 806 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 807 STp->dirty = 0; 808 (STp->buffer)->buffer_bytes = 0; 809 if (STps->drv_block >= 0) 810 STps->drv_block += blks; 811 result = (-ENOSPC); 812 } else { 813 st_printk(KERN_ERR, STp, "Error on flush.\n"); 814 STps->drv_block = (-1); 815 result = (-EIO); 816 } 817 } else { 818 if (STps->drv_block >= 0) 819 STps->drv_block += blks; 820 STp->dirty = 0; 821 (STp->buffer)->buffer_bytes = 0; 822 } 823 st_release_request(SRpnt); 824 SRpnt = NULL; 825 } 826 return result; 827 } 828 829 830 /* Flush the tape buffer. The tape will be positioned correctly unless 831 seek_next is true. */ 832 static int flush_buffer(struct scsi_tape *STp, int seek_next) 833 { 834 int backspace, result; 835 struct st_partstat *STps; 836 837 /* 838 * If there was a bus reset, block further access 839 * to this device. 840 */ 841 if (STp->pos_unknown) 842 return (-EIO); 843 844 if (STp->ready != ST_READY) 845 return 0; 846 STps = &(STp->ps[STp->partition]); 847 if (STps->rw == ST_WRITING) /* Writing */ 848 return st_flush_write_buffer(STp); 849 850 if (STp->block_size == 0) 851 return 0; 852 853 backspace = ((STp->buffer)->buffer_bytes + 854 (STp->buffer)->read_pointer) / STp->block_size - 855 ((STp->buffer)->read_pointer + STp->block_size - 1) / 856 STp->block_size; 857 (STp->buffer)->buffer_bytes = 0; 858 (STp->buffer)->read_pointer = 0; 859 result = 0; 860 if (!seek_next) { 861 if (STps->eof == ST_FM_HIT) { 862 result = cross_eof(STp, 0); /* Back over the EOF hit */ 863 if (!result) 864 STps->eof = ST_NOEOF; 865 else { 866 if (STps->drv_file >= 0) 867 STps->drv_file++; 868 STps->drv_block = 0; 869 } 870 } 871 if (!result && backspace > 0) 872 result = st_int_ioctl(STp, MTBSR, backspace); 873 } else if (STps->eof == ST_FM_HIT) { 874 if (STps->drv_file >= 0) 875 STps->drv_file++; 876 STps->drv_block = 0; 877 STps->eof = ST_NOEOF; 878 } 879 return result; 880 881 } 882 883 /* Set the mode parameters */ 884 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 885 { 886 int set_it = 0; 887 unsigned long arg; 888 889 if (!STp->density_changed && 890 STm->default_density >= 0 && 891 STm->default_density != STp->density) { 892 arg = STm->default_density; 893 set_it = 1; 894 } else 895 arg = STp->density; 896 arg <<= MT_ST_DENSITY_SHIFT; 897 if (!STp->blksize_changed && 898 STm->default_blksize >= 0 && 899 STm->default_blksize != STp->block_size) { 900 arg |= STm->default_blksize; 901 set_it = 1; 902 } else 903 arg |= STp->block_size; 904 if (set_it && 905 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 906 st_printk(KERN_WARNING, STp, 907 "Can't set default block size to %d bytes " 908 "and density %x.\n", 909 STm->default_blksize, STm->default_density); 910 if (modes_defined) 911 return (-EINVAL); 912 } 913 return 0; 914 } 915 916 917 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 918 static int do_door_lock(struct scsi_tape * STp, int do_lock) 919 { 920 int retval; 921 922 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 923 924 retval = scsi_set_medium_removal(STp->device, 925 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 926 if (!retval) 927 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 928 else 929 STp->door_locked = ST_LOCK_FAILS; 930 return retval; 931 } 932 933 934 /* Set the internal state after reset */ 935 static void reset_state(struct scsi_tape *STp) 936 { 937 int i; 938 struct st_partstat *STps; 939 940 STp->pos_unknown = 0; 941 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 942 STps = &(STp->ps[i]); 943 STps->rw = ST_IDLE; 944 STps->eof = ST_NOEOF; 945 STps->at_sm = 0; 946 STps->last_block_valid = 0; 947 STps->drv_block = -1; 948 STps->drv_file = -1; 949 } 950 if (STp->can_partitions) { 951 STp->partition = find_partition(STp); 952 if (STp->partition < 0) 953 STp->partition = 0; 954 STp->new_partition = STp->partition; 955 } 956 } 957 958 /* Test if the drive is ready. Returns either one of the codes below or a negative system 959 error code. */ 960 #define CHKRES_READY 0 961 #define CHKRES_NEW_SESSION 1 962 #define CHKRES_NOT_READY 2 963 #define CHKRES_NO_TAPE 3 964 965 #define MAX_ATTENTIONS 10 966 967 static int test_ready(struct scsi_tape *STp, int do_wait) 968 { 969 int attentions, waits, max_wait, scode; 970 int retval = CHKRES_READY, new_session = 0; 971 unsigned char cmd[MAX_COMMAND_SIZE]; 972 struct st_request *SRpnt = NULL; 973 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 974 975 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 976 977 for (attentions=waits=0; ; ) { 978 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 979 cmd[0] = TEST_UNIT_READY; 980 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 981 STp->long_timeout, MAX_READY_RETRIES, 1); 982 983 if (!SRpnt) { 984 retval = (STp->buffer)->syscall_result; 985 break; 986 } 987 988 if (cmdstatp->have_sense) { 989 990 scode = cmdstatp->sense_hdr.sense_key; 991 992 if (scode == UNIT_ATTENTION) { /* New media? */ 993 new_session = 1; 994 if (attentions < MAX_ATTENTIONS) { 995 attentions++; 996 continue; 997 } 998 else { 999 retval = (-EIO); 1000 break; 1001 } 1002 } 1003 1004 if (scode == NOT_READY) { 1005 if (waits < max_wait) { 1006 if (msleep_interruptible(1000)) { 1007 retval = (-EINTR); 1008 break; 1009 } 1010 waits++; 1011 continue; 1012 } 1013 else { 1014 if ((STp->device)->scsi_level >= SCSI_2 && 1015 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1016 retval = CHKRES_NO_TAPE; 1017 else 1018 retval = CHKRES_NOT_READY; 1019 break; 1020 } 1021 } 1022 } 1023 1024 retval = (STp->buffer)->syscall_result; 1025 if (!retval) 1026 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1027 break; 1028 } 1029 1030 if (SRpnt != NULL) 1031 st_release_request(SRpnt); 1032 return retval; 1033 } 1034 1035 1036 /* See if the drive is ready and gather information about the tape. Return values: 1037 < 0 negative error code from errno.h 1038 0 drive ready 1039 1 drive not ready (possibly no tape) 1040 */ 1041 static int check_tape(struct scsi_tape *STp, struct file *filp) 1042 { 1043 int i, retval, new_session = 0, do_wait; 1044 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1045 unsigned short st_flags = filp->f_flags; 1046 struct st_request *SRpnt = NULL; 1047 struct st_modedef *STm; 1048 struct st_partstat *STps; 1049 struct inode *inode = file_inode(filp); 1050 int mode = TAPE_MODE(inode); 1051 1052 STp->ready = ST_READY; 1053 1054 if (mode != STp->current_mode) { 1055 DEBC_printk(STp, "Mode change from %d to %d.\n", 1056 STp->current_mode, mode); 1057 new_session = 1; 1058 STp->current_mode = mode; 1059 } 1060 STm = &(STp->modes[STp->current_mode]); 1061 1062 saved_cleaning = STp->cleaning_req; 1063 STp->cleaning_req = 0; 1064 1065 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1066 retval = test_ready(STp, do_wait); 1067 1068 if (retval < 0) 1069 goto err_out; 1070 1071 if (retval == CHKRES_NEW_SESSION) { 1072 STp->pos_unknown = 0; 1073 STp->partition = STp->new_partition = 0; 1074 if (STp->can_partitions) 1075 STp->nbr_partitions = 1; /* This guess will be updated later 1076 if necessary */ 1077 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1078 STps = &(STp->ps[i]); 1079 STps->rw = ST_IDLE; 1080 STps->eof = ST_NOEOF; 1081 STps->at_sm = 0; 1082 STps->last_block_valid = 0; 1083 STps->drv_block = 0; 1084 STps->drv_file = 0; 1085 } 1086 new_session = 1; 1087 } 1088 else { 1089 STp->cleaning_req |= saved_cleaning; 1090 1091 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1092 if (retval == CHKRES_NO_TAPE) 1093 STp->ready = ST_NO_TAPE; 1094 else 1095 STp->ready = ST_NOT_READY; 1096 1097 STp->density = 0; /* Clear the erroneous "residue" */ 1098 STp->write_prot = 0; 1099 STp->block_size = 0; 1100 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1101 STp->partition = STp->new_partition = 0; 1102 STp->door_locked = ST_UNLOCKED; 1103 return CHKRES_NOT_READY; 1104 } 1105 } 1106 1107 if (STp->omit_blklims) 1108 STp->min_block = STp->max_block = (-1); 1109 else { 1110 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1111 cmd[0] = READ_BLOCK_LIMITS; 1112 1113 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1114 STp->device->request_queue->rq_timeout, 1115 MAX_READY_RETRIES, 1); 1116 if (!SRpnt) { 1117 retval = (STp->buffer)->syscall_result; 1118 goto err_out; 1119 } 1120 1121 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1122 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1123 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1124 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1125 (STp->buffer)->b_data[5]; 1126 if ( DEB( debugging || ) !STp->inited) 1127 st_printk(KERN_INFO, STp, 1128 "Block limits %d - %d bytes.\n", 1129 STp->min_block, STp->max_block); 1130 } else { 1131 STp->min_block = STp->max_block = (-1); 1132 DEBC_printk(STp, "Can't read block limits.\n"); 1133 } 1134 } 1135 1136 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1137 cmd[0] = MODE_SENSE; 1138 cmd[4] = 12; 1139 1140 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1141 STp->device->request_queue->rq_timeout, 1142 MAX_READY_RETRIES, 1); 1143 if (!SRpnt) { 1144 retval = (STp->buffer)->syscall_result; 1145 goto err_out; 1146 } 1147 1148 if ((STp->buffer)->syscall_result != 0) { 1149 DEBC_printk(STp, "No Mode Sense.\n"); 1150 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1151 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1152 STp->drv_write_prot = 0; 1153 } else { 1154 DEBC_printk(STp,"Mode sense. Length %d, " 1155 "medium %x, WBS %x, BLL %d\n", 1156 (STp->buffer)->b_data[0], 1157 (STp->buffer)->b_data[1], 1158 (STp->buffer)->b_data[2], 1159 (STp->buffer)->b_data[3]); 1160 1161 if ((STp->buffer)->b_data[3] >= 8) { 1162 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1163 STp->density = (STp->buffer)->b_data[4]; 1164 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1165 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1166 DEBC_printk(STp, "Density %x, tape length: %x, " 1167 "drv buffer: %d\n", 1168 STp->density, 1169 (STp->buffer)->b_data[5] * 65536 + 1170 (STp->buffer)->b_data[6] * 256 + 1171 (STp->buffer)->b_data[7], 1172 STp->drv_buffer); 1173 } 1174 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1175 if (!STp->drv_buffer && STp->immediate_filemark) { 1176 st_printk(KERN_WARNING, STp, 1177 "non-buffered tape: disabling " 1178 "writing immediate filemarks\n"); 1179 STp->immediate_filemark = 0; 1180 } 1181 } 1182 st_release_request(SRpnt); 1183 SRpnt = NULL; 1184 STp->inited = 1; 1185 1186 if (STp->block_size > 0) 1187 (STp->buffer)->buffer_blocks = 1188 (STp->buffer)->buffer_size / STp->block_size; 1189 else 1190 (STp->buffer)->buffer_blocks = 1; 1191 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1192 1193 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1194 STp->block_size, (STp->buffer)->buffer_size, 1195 (STp->buffer)->buffer_blocks); 1196 1197 if (STp->drv_write_prot) { 1198 STp->write_prot = 1; 1199 1200 DEBC_printk(STp, "Write protected\n"); 1201 1202 if (do_wait && 1203 ((st_flags & O_ACCMODE) == O_WRONLY || 1204 (st_flags & O_ACCMODE) == O_RDWR)) { 1205 retval = (-EROFS); 1206 goto err_out; 1207 } 1208 } 1209 1210 if (STp->can_partitions && STp->nbr_partitions < 1) { 1211 /* This code is reached when the device is opened for the first time 1212 after the driver has been initialized with tape in the drive and the 1213 partition support has been enabled. */ 1214 DEBC_printk(STp, "Updating partition number in status.\n"); 1215 if ((STp->partition = find_partition(STp)) < 0) { 1216 retval = STp->partition; 1217 goto err_out; 1218 } 1219 STp->new_partition = STp->partition; 1220 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1221 } 1222 1223 if (new_session) { /* Change the drive parameters for the new mode */ 1224 STp->density_changed = STp->blksize_changed = 0; 1225 STp->compression_changed = 0; 1226 if (!(STm->defaults_for_writes) && 1227 (retval = set_mode_densblk(STp, STm)) < 0) 1228 goto err_out; 1229 1230 if (STp->default_drvbuffer != 0xff) { 1231 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1232 st_printk(KERN_WARNING, STp, 1233 "Can't set default drive " 1234 "buffering to %d.\n", 1235 STp->default_drvbuffer); 1236 } 1237 } 1238 1239 return CHKRES_READY; 1240 1241 err_out: 1242 return retval; 1243 } 1244 1245 1246 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1247 module count. */ 1248 static int st_open(struct inode *inode, struct file *filp) 1249 { 1250 int i, retval = (-EIO); 1251 int resumed = 0; 1252 struct scsi_tape *STp; 1253 struct st_partstat *STps; 1254 int dev = TAPE_NR(inode); 1255 1256 /* 1257 * We really want to do nonseekable_open(inode, filp); here, but some 1258 * versions of tar incorrectly call lseek on tapes and bail out if that 1259 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1260 */ 1261 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1262 1263 if (!(STp = scsi_tape_get(dev))) { 1264 return -ENXIO; 1265 } 1266 1267 filp->private_data = STp; 1268 1269 spin_lock(&st_use_lock); 1270 if (STp->in_use) { 1271 spin_unlock(&st_use_lock); 1272 scsi_tape_put(STp); 1273 DEBC_printk(STp, "Device already in use.\n"); 1274 return (-EBUSY); 1275 } 1276 1277 STp->in_use = 1; 1278 spin_unlock(&st_use_lock); 1279 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1280 1281 if (scsi_autopm_get_device(STp->device) < 0) { 1282 retval = -EIO; 1283 goto err_out; 1284 } 1285 resumed = 1; 1286 if (!scsi_block_when_processing_errors(STp->device)) { 1287 retval = (-ENXIO); 1288 goto err_out; 1289 } 1290 1291 /* See that we have at least a one page buffer available */ 1292 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1293 st_printk(KERN_WARNING, STp, 1294 "Can't allocate one page tape buffer.\n"); 1295 retval = (-EOVERFLOW); 1296 goto err_out; 1297 } 1298 1299 (STp->buffer)->cleared = 0; 1300 (STp->buffer)->writing = 0; 1301 (STp->buffer)->syscall_result = 0; 1302 1303 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1304 1305 STp->dirty = 0; 1306 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1307 STps = &(STp->ps[i]); 1308 STps->rw = ST_IDLE; 1309 } 1310 STp->try_dio_now = STp->try_dio; 1311 STp->recover_count = 0; 1312 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1313 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1314 1315 retval = check_tape(STp, filp); 1316 if (retval < 0) 1317 goto err_out; 1318 if ((filp->f_flags & O_NONBLOCK) == 0 && 1319 retval != CHKRES_READY) { 1320 if (STp->ready == NO_TAPE) 1321 retval = (-ENOMEDIUM); 1322 else 1323 retval = (-EIO); 1324 goto err_out; 1325 } 1326 return 0; 1327 1328 err_out: 1329 normalize_buffer(STp->buffer); 1330 spin_lock(&st_use_lock); 1331 STp->in_use = 0; 1332 spin_unlock(&st_use_lock); 1333 if (resumed) 1334 scsi_autopm_put_device(STp->device); 1335 scsi_tape_put(STp); 1336 return retval; 1337 1338 } 1339 1340 1341 /* Flush the tape buffer before close */ 1342 static int st_flush(struct file *filp, fl_owner_t id) 1343 { 1344 int result = 0, result2; 1345 unsigned char cmd[MAX_COMMAND_SIZE]; 1346 struct st_request *SRpnt; 1347 struct scsi_tape *STp = filp->private_data; 1348 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1349 struct st_partstat *STps = &(STp->ps[STp->partition]); 1350 1351 if (file_count(filp) > 1) 1352 return 0; 1353 1354 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1355 result = st_flush_write_buffer(STp); 1356 if (result != 0 && result != (-ENOSPC)) 1357 goto out; 1358 } 1359 1360 if (STp->can_partitions && 1361 (result2 = switch_partition(STp)) < 0) { 1362 DEBC_printk(STp, "switch_partition at close failed.\n"); 1363 if (result == 0) 1364 result = result2; 1365 goto out; 1366 } 1367 1368 DEBC( if (STp->nbr_requests) 1369 st_printk(KERN_DEBUG, STp, 1370 "Number of r/w requests %d, dio used in %d, " 1371 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1372 STp->nbr_pages)); 1373 1374 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1375 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1376 1377 #if DEBUG 1378 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1379 STp->nbr_waits, STp->nbr_finished); 1380 #endif 1381 memset(cmd, 0, MAX_COMMAND_SIZE); 1382 cmd[0] = WRITE_FILEMARKS; 1383 if (STp->immediate_filemark) 1384 cmd[1] = 1; 1385 cmd[4] = 1 + STp->two_fm; 1386 1387 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1388 STp->device->request_queue->rq_timeout, 1389 MAX_WRITE_RETRIES, 1); 1390 if (!SRpnt) { 1391 result = (STp->buffer)->syscall_result; 1392 goto out; 1393 } 1394 1395 if (STp->buffer->syscall_result == 0 || 1396 (cmdstatp->have_sense && !cmdstatp->deferred && 1397 (cmdstatp->flags & SENSE_EOM) && 1398 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1399 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1400 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1401 /* Write successful at EOM */ 1402 st_release_request(SRpnt); 1403 SRpnt = NULL; 1404 if (STps->drv_file >= 0) 1405 STps->drv_file++; 1406 STps->drv_block = 0; 1407 if (STp->two_fm) 1408 cross_eof(STp, 0); 1409 STps->eof = ST_FM; 1410 } 1411 else { /* Write error */ 1412 st_release_request(SRpnt); 1413 SRpnt = NULL; 1414 st_printk(KERN_ERR, STp, 1415 "Error on write filemark.\n"); 1416 if (result == 0) 1417 result = (-EIO); 1418 } 1419 1420 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1421 } else if (!STp->rew_at_close) { 1422 STps = &(STp->ps[STp->partition]); 1423 if (!STm->sysv || STps->rw != ST_READING) { 1424 if (STp->can_bsr) 1425 result = flush_buffer(STp, 0); 1426 else if (STps->eof == ST_FM_HIT) { 1427 result = cross_eof(STp, 0); 1428 if (result) { 1429 if (STps->drv_file >= 0) 1430 STps->drv_file++; 1431 STps->drv_block = 0; 1432 STps->eof = ST_FM; 1433 } else 1434 STps->eof = ST_NOEOF; 1435 } 1436 } else if ((STps->eof == ST_NOEOF && 1437 !(result = cross_eof(STp, 1))) || 1438 STps->eof == ST_FM_HIT) { 1439 if (STps->drv_file >= 0) 1440 STps->drv_file++; 1441 STps->drv_block = 0; 1442 STps->eof = ST_FM; 1443 } 1444 } 1445 1446 out: 1447 if (STp->rew_at_close) { 1448 result2 = st_int_ioctl(STp, MTREW, 1); 1449 if (result == 0) 1450 result = result2; 1451 } 1452 return result; 1453 } 1454 1455 1456 /* Close the device and release it. BKL is not needed: this is the only thread 1457 accessing this tape. */ 1458 static int st_release(struct inode *inode, struct file *filp) 1459 { 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 0; 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 = sign_extend32(get_unaligned_be24(&cmd[2]), 23); 2684 if (direction) 2685 sc = -sc; 2686 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2687 direction ? "backward" : "forward", sc, units); 2688 } 2689 #else 2690 #define ST_DEB_FORWARD 0 2691 #define ST_DEB_BACKWARD 1 2692 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2693 #endif 2694 2695 2696 /* Internal ioctl function */ 2697 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2698 { 2699 int timeout; 2700 long ltmp; 2701 int ioctl_result; 2702 int chg_eof = 1; 2703 unsigned char cmd[MAX_COMMAND_SIZE]; 2704 struct st_request *SRpnt; 2705 struct st_partstat *STps; 2706 int fileno, blkno, at_sm, undone; 2707 int datalen = 0, direction = DMA_NONE; 2708 2709 WARN_ON(STp->buffer->do_dio != 0); 2710 if (STp->ready != ST_READY) { 2711 if (STp->ready == ST_NO_TAPE) 2712 return (-ENOMEDIUM); 2713 else 2714 return (-EIO); 2715 } 2716 timeout = STp->long_timeout; 2717 STps = &(STp->ps[STp->partition]); 2718 fileno = STps->drv_file; 2719 blkno = STps->drv_block; 2720 at_sm = STps->at_sm; 2721 2722 memset(cmd, 0, MAX_COMMAND_SIZE); 2723 switch (cmd_in) { 2724 case MTFSFM: 2725 chg_eof = 0; /* Changed from the FSF after this */ 2726 fallthrough; 2727 case MTFSF: 2728 cmd[0] = SPACE; 2729 cmd[1] = 0x01; /* Space FileMarks */ 2730 cmd[2] = (arg >> 16); 2731 cmd[3] = (arg >> 8); 2732 cmd[4] = arg; 2733 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2734 if (fileno >= 0) 2735 fileno += arg; 2736 blkno = 0; 2737 at_sm &= (arg == 0); 2738 break; 2739 case MTBSFM: 2740 chg_eof = 0; /* Changed from the FSF after this */ 2741 fallthrough; 2742 case MTBSF: 2743 cmd[0] = SPACE; 2744 cmd[1] = 0x01; /* Space FileMarks */ 2745 ltmp = (-arg); 2746 cmd[2] = (ltmp >> 16); 2747 cmd[3] = (ltmp >> 8); 2748 cmd[4] = ltmp; 2749 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2750 if (fileno >= 0) 2751 fileno -= arg; 2752 blkno = (-1); /* We can't know the block number */ 2753 at_sm &= (arg == 0); 2754 break; 2755 case MTFSR: 2756 cmd[0] = SPACE; 2757 cmd[1] = 0x00; /* Space Blocks */ 2758 cmd[2] = (arg >> 16); 2759 cmd[3] = (arg >> 8); 2760 cmd[4] = arg; 2761 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2762 if (blkno >= 0) 2763 blkno += arg; 2764 at_sm &= (arg == 0); 2765 break; 2766 case MTBSR: 2767 cmd[0] = SPACE; 2768 cmd[1] = 0x00; /* Space Blocks */ 2769 ltmp = (-arg); 2770 cmd[2] = (ltmp >> 16); 2771 cmd[3] = (ltmp >> 8); 2772 cmd[4] = ltmp; 2773 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2774 if (blkno >= 0) 2775 blkno -= arg; 2776 at_sm &= (arg == 0); 2777 break; 2778 case MTFSS: 2779 cmd[0] = SPACE; 2780 cmd[1] = 0x04; /* Space Setmarks */ 2781 cmd[2] = (arg >> 16); 2782 cmd[3] = (arg >> 8); 2783 cmd[4] = arg; 2784 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2785 if (arg != 0) { 2786 blkno = fileno = (-1); 2787 at_sm = 1; 2788 } 2789 break; 2790 case MTBSS: 2791 cmd[0] = SPACE; 2792 cmd[1] = 0x04; /* Space Setmarks */ 2793 ltmp = (-arg); 2794 cmd[2] = (ltmp >> 16); 2795 cmd[3] = (ltmp >> 8); 2796 cmd[4] = ltmp; 2797 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2798 if (arg != 0) { 2799 blkno = fileno = (-1); 2800 at_sm = 1; 2801 } 2802 break; 2803 case MTWEOF: 2804 case MTWEOFI: 2805 case MTWSM: 2806 if (STp->write_prot) 2807 return (-EACCES); 2808 cmd[0] = WRITE_FILEMARKS; 2809 if (cmd_in == MTWSM) 2810 cmd[1] = 2; 2811 if (cmd_in == MTWEOFI || 2812 (cmd_in == MTWEOF && STp->immediate_filemark)) 2813 cmd[1] |= 1; 2814 cmd[2] = (arg >> 16); 2815 cmd[3] = (arg >> 8); 2816 cmd[4] = arg; 2817 timeout = STp->device->request_queue->rq_timeout; 2818 DEBC( 2819 if (cmd_in != MTWSM) 2820 st_printk(ST_DEB_MSG, STp, 2821 "Writing %d filemarks.\n", 2822 cmd[2] * 65536 + 2823 cmd[3] * 256 + 2824 cmd[4]); 2825 else 2826 st_printk(ST_DEB_MSG, STp, 2827 "Writing %d setmarks.\n", 2828 cmd[2] * 65536 + 2829 cmd[3] * 256 + 2830 cmd[4]); 2831 ) 2832 if (fileno >= 0) 2833 fileno += arg; 2834 blkno = 0; 2835 at_sm = (cmd_in == MTWSM); 2836 break; 2837 case MTREW: 2838 cmd[0] = REZERO_UNIT; 2839 if (STp->immediate) { 2840 cmd[1] = 1; /* Don't wait for completion */ 2841 timeout = STp->device->request_queue->rq_timeout; 2842 } 2843 DEBC_printk(STp, "Rewinding tape.\n"); 2844 fileno = blkno = at_sm = 0; 2845 break; 2846 case MTNOP: 2847 DEBC_printk(STp, "No op on tape.\n"); 2848 return 0; /* Should do something ? */ 2849 case MTRETEN: 2850 cmd[0] = START_STOP; 2851 if (STp->immediate) { 2852 cmd[1] = 1; /* Don't wait for completion */ 2853 timeout = STp->device->request_queue->rq_timeout; 2854 } 2855 cmd[4] = 3; 2856 DEBC_printk(STp, "Retensioning tape.\n"); 2857 fileno = blkno = at_sm = 0; 2858 break; 2859 case MTEOM: 2860 if (!STp->fast_mteom) { 2861 /* space to the end of tape */ 2862 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2863 fileno = STps->drv_file; 2864 if (STps->eof >= ST_EOD_1) 2865 return 0; 2866 /* The next lines would hide the number of spaced FileMarks 2867 That's why I inserted the previous lines. I had no luck 2868 with detecting EOM with FSF, so we go now to EOM. 2869 Joerg Weule */ 2870 } else 2871 fileno = (-1); 2872 cmd[0] = SPACE; 2873 cmd[1] = 3; 2874 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2875 blkno = -1; 2876 at_sm = 0; 2877 break; 2878 case MTERASE: 2879 if (STp->write_prot) 2880 return (-EACCES); 2881 cmd[0] = ERASE; 2882 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2883 if (STp->immediate) { 2884 cmd[1] |= 2; /* Don't wait for completion */ 2885 timeout = STp->device->request_queue->rq_timeout; 2886 } 2887 else 2888 timeout = STp->long_timeout * 8; 2889 2890 DEBC_printk(STp, "Erasing tape.\n"); 2891 fileno = blkno = at_sm = 0; 2892 break; 2893 case MTSETBLK: /* Set block length */ 2894 case MTSETDENSITY: /* Set tape density */ 2895 case MTSETDRVBUFFER: /* Set drive buffering */ 2896 case SET_DENS_AND_BLK: /* Set density and block size */ 2897 chg_eof = 0; 2898 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2899 return (-EIO); /* Not allowed if data in buffer */ 2900 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2901 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2902 STp->max_block > 0 && 2903 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2904 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2905 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2906 return (-EINVAL); 2907 } 2908 cmd[0] = MODE_SELECT; 2909 if ((STp->use_pf & USE_PF)) 2910 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2911 cmd[4] = datalen = 12; 2912 direction = DMA_TO_DEVICE; 2913 2914 memset((STp->buffer)->b_data, 0, 12); 2915 if (cmd_in == MTSETDRVBUFFER) 2916 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2917 else 2918 (STp->buffer)->b_data[2] = 2919 STp->drv_buffer << 4; 2920 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2921 if (cmd_in == MTSETDENSITY) { 2922 (STp->buffer)->b_data[4] = arg; 2923 STp->density_changed = 1; /* At least we tried ;-) */ 2924 } else if (cmd_in == SET_DENS_AND_BLK) 2925 (STp->buffer)->b_data[4] = arg >> 24; 2926 else 2927 (STp->buffer)->b_data[4] = STp->density; 2928 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2929 ltmp = arg & MT_ST_BLKSIZE_MASK; 2930 if (cmd_in == MTSETBLK) 2931 STp->blksize_changed = 1; /* At least we tried ;-) */ 2932 } else 2933 ltmp = STp->block_size; 2934 (STp->buffer)->b_data[9] = (ltmp >> 16); 2935 (STp->buffer)->b_data[10] = (ltmp >> 8); 2936 (STp->buffer)->b_data[11] = ltmp; 2937 timeout = STp->device->request_queue->rq_timeout; 2938 DEBC( 2939 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2940 st_printk(ST_DEB_MSG, STp, 2941 "Setting block size to %d bytes.\n", 2942 (STp->buffer)->b_data[9] * 65536 + 2943 (STp->buffer)->b_data[10] * 256 + 2944 (STp->buffer)->b_data[11]); 2945 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2946 st_printk(ST_DEB_MSG, STp, 2947 "Setting density code to %x.\n", 2948 (STp->buffer)->b_data[4]); 2949 if (cmd_in == MTSETDRVBUFFER) 2950 st_printk(ST_DEB_MSG, STp, 2951 "Setting drive buffer code to %d.\n", 2952 ((STp->buffer)->b_data[2] >> 4) & 7); 2953 ) 2954 break; 2955 default: 2956 return (-ENOSYS); 2957 } 2958 2959 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2960 timeout, MAX_RETRIES, 1); 2961 if (!SRpnt) 2962 return (STp->buffer)->syscall_result; 2963 2964 ioctl_result = (STp->buffer)->syscall_result; 2965 2966 if (!ioctl_result) { /* SCSI command successful */ 2967 st_release_request(SRpnt); 2968 SRpnt = NULL; 2969 STps->drv_block = blkno; 2970 STps->drv_file = fileno; 2971 STps->at_sm = at_sm; 2972 2973 if (cmd_in == MTBSFM) 2974 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2975 else if (cmd_in == MTFSFM) 2976 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2977 2978 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2979 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2980 if (STp->block_size != 0) { 2981 (STp->buffer)->buffer_blocks = 2982 (STp->buffer)->buffer_size / STp->block_size; 2983 } 2984 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2985 if (cmd_in == SET_DENS_AND_BLK) 2986 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2987 } else if (cmd_in == MTSETDRVBUFFER) 2988 STp->drv_buffer = (arg & 7); 2989 else if (cmd_in == MTSETDENSITY) 2990 STp->density = arg; 2991 2992 if (cmd_in == MTEOM) 2993 STps->eof = ST_EOD; 2994 else if (cmd_in == MTFSF) 2995 STps->eof = ST_FM; 2996 else if (chg_eof) 2997 STps->eof = ST_NOEOF; 2998 2999 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3000 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3001 } else { /* SCSI command was not completely successful. Don't return 3002 from this block without releasing the SCSI command block! */ 3003 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3004 3005 if (cmdstatp->flags & SENSE_EOM) { 3006 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3007 cmd_in != MTBSR && cmd_in != MTBSS) 3008 STps->eof = ST_EOM_OK; 3009 STps->drv_block = 0; 3010 } 3011 3012 if (cmdstatp->remainder_valid) 3013 undone = (int)cmdstatp->uremainder64; 3014 else 3015 undone = 0; 3016 3017 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3018 cmdstatp->have_sense && 3019 (cmdstatp->flags & SENSE_EOM)) { 3020 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3021 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3022 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3023 STps->eof = ST_NOEOF; 3024 } else { /* Writing EOF(s) failed */ 3025 if (fileno >= 0) 3026 fileno -= undone; 3027 if (undone < arg) 3028 STps->eof = ST_NOEOF; 3029 } 3030 STps->drv_file = fileno; 3031 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3032 if (fileno >= 0) 3033 STps->drv_file = fileno - undone; 3034 else 3035 STps->drv_file = fileno; 3036 STps->drv_block = -1; 3037 STps->eof = ST_NOEOF; 3038 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3039 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3040 undone = (-undone); 3041 if (STps->drv_file >= 0) 3042 STps->drv_file = fileno + undone; 3043 STps->drv_block = 0; 3044 STps->eof = ST_NOEOF; 3045 } else if (cmd_in == MTFSR) { 3046 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3047 if (STps->drv_file >= 0) 3048 STps->drv_file++; 3049 STps->drv_block = 0; 3050 STps->eof = ST_FM; 3051 } else { 3052 if (blkno >= undone) 3053 STps->drv_block = blkno - undone; 3054 else 3055 STps->drv_block = (-1); 3056 STps->eof = ST_NOEOF; 3057 } 3058 } else if (cmd_in == MTBSR) { 3059 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3060 STps->drv_file--; 3061 STps->drv_block = (-1); 3062 } else { 3063 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3064 undone = (-undone); 3065 if (STps->drv_block >= 0) 3066 STps->drv_block = blkno + undone; 3067 } 3068 STps->eof = ST_NOEOF; 3069 } else if (cmd_in == MTEOM) { 3070 STps->drv_file = (-1); 3071 STps->drv_block = (-1); 3072 STps->eof = ST_EOD; 3073 } else if (cmd_in == MTSETBLK || 3074 cmd_in == MTSETDENSITY || 3075 cmd_in == MTSETDRVBUFFER || 3076 cmd_in == SET_DENS_AND_BLK) { 3077 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3078 !(STp->use_pf & PF_TESTED)) { 3079 /* Try the other possible state of Page Format if not 3080 already tried */ 3081 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3082 st_release_request(SRpnt); 3083 SRpnt = NULL; 3084 return st_int_ioctl(STp, cmd_in, arg); 3085 } 3086 } else if (chg_eof) 3087 STps->eof = ST_NOEOF; 3088 3089 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3090 STps->eof = ST_EOD; 3091 3092 st_release_request(SRpnt); 3093 SRpnt = NULL; 3094 } 3095 3096 return ioctl_result; 3097 } 3098 3099 3100 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3101 structure. */ 3102 3103 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3104 int logical) 3105 { 3106 int result; 3107 unsigned char scmd[MAX_COMMAND_SIZE]; 3108 struct st_request *SRpnt; 3109 3110 if (STp->ready != ST_READY) 3111 return (-EIO); 3112 3113 memset(scmd, 0, MAX_COMMAND_SIZE); 3114 if ((STp->device)->scsi_level < SCSI_2) { 3115 scmd[0] = QFA_REQUEST_BLOCK; 3116 scmd[4] = 3; 3117 } else { 3118 scmd[0] = READ_POSITION; 3119 if (!logical && !STp->scsi2_logical) 3120 scmd[1] = 1; 3121 } 3122 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3123 STp->device->request_queue->rq_timeout, 3124 MAX_READY_RETRIES, 1); 3125 if (!SRpnt) 3126 return (STp->buffer)->syscall_result; 3127 3128 if ((STp->buffer)->syscall_result != 0 || 3129 (STp->device->scsi_level >= SCSI_2 && 3130 ((STp->buffer)->b_data[0] & 4) != 0)) { 3131 *block = *partition = 0; 3132 DEBC_printk(STp, " Can't read tape position.\n"); 3133 result = (-EIO); 3134 } else { 3135 result = 0; 3136 if ((STp->device)->scsi_level < SCSI_2) { 3137 *block = ((STp->buffer)->b_data[0] << 16) 3138 + ((STp->buffer)->b_data[1] << 8) 3139 + (STp->buffer)->b_data[2]; 3140 *partition = 0; 3141 } else { 3142 *block = ((STp->buffer)->b_data[4] << 24) 3143 + ((STp->buffer)->b_data[5] << 16) 3144 + ((STp->buffer)->b_data[6] << 8) 3145 + (STp->buffer)->b_data[7]; 3146 *partition = (STp->buffer)->b_data[1]; 3147 if (((STp->buffer)->b_data[0] & 0x80) && 3148 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3149 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3150 } 3151 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3152 *block, *partition); 3153 } 3154 st_release_request(SRpnt); 3155 SRpnt = NULL; 3156 3157 return result; 3158 } 3159 3160 3161 /* Set the tape block and partition. Negative partition means that only the 3162 block should be set in vendor specific way. */ 3163 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3164 int logical) 3165 { 3166 struct st_partstat *STps; 3167 int result, p; 3168 unsigned int blk; 3169 int timeout; 3170 unsigned char scmd[MAX_COMMAND_SIZE]; 3171 struct st_request *SRpnt; 3172 3173 if (STp->ready != ST_READY) 3174 return (-EIO); 3175 timeout = STp->long_timeout; 3176 STps = &(STp->ps[STp->partition]); 3177 3178 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3179 block, partition); 3180 DEB(if (partition < 0) 3181 return (-EIO); ) 3182 3183 /* Update the location at the partition we are leaving */ 3184 if ((!STp->can_partitions && partition != 0) || 3185 partition >= ST_NBR_PARTITIONS) 3186 return (-EINVAL); 3187 if (partition != STp->partition) { 3188 if (get_location(STp, &blk, &p, 1)) 3189 STps->last_block_valid = 0; 3190 else { 3191 STps->last_block_valid = 1; 3192 STps->last_block_visited = blk; 3193 DEBC_printk(STp, "Visited block %d for " 3194 "partition %d saved.\n", 3195 blk, STp->partition); 3196 } 3197 } 3198 3199 memset(scmd, 0, MAX_COMMAND_SIZE); 3200 if ((STp->device)->scsi_level < SCSI_2) { 3201 scmd[0] = QFA_SEEK_BLOCK; 3202 scmd[2] = (block >> 16); 3203 scmd[3] = (block >> 8); 3204 scmd[4] = block; 3205 scmd[5] = 0; 3206 } else { 3207 scmd[0] = SEEK_10; 3208 scmd[3] = (block >> 24); 3209 scmd[4] = (block >> 16); 3210 scmd[5] = (block >> 8); 3211 scmd[6] = block; 3212 if (!logical && !STp->scsi2_logical) 3213 scmd[1] = 4; 3214 if (STp->partition != partition) { 3215 scmd[1] |= 2; 3216 scmd[8] = partition; 3217 DEBC_printk(STp, "Trying to change partition " 3218 "from %d to %d\n", STp->partition, 3219 partition); 3220 } 3221 } 3222 if (STp->immediate) { 3223 scmd[1] |= 1; /* Don't wait for completion */ 3224 timeout = STp->device->request_queue->rq_timeout; 3225 } 3226 3227 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3228 timeout, MAX_READY_RETRIES, 1); 3229 if (!SRpnt) 3230 return (STp->buffer)->syscall_result; 3231 3232 STps->drv_block = STps->drv_file = (-1); 3233 STps->eof = ST_NOEOF; 3234 if ((STp->buffer)->syscall_result != 0) { 3235 result = (-EIO); 3236 if (STp->can_partitions && 3237 (STp->device)->scsi_level >= SCSI_2 && 3238 (p = find_partition(STp)) >= 0) 3239 STp->partition = p; 3240 } else { 3241 if (STp->can_partitions) { 3242 STp->partition = partition; 3243 STps = &(STp->ps[partition]); 3244 if (!STps->last_block_valid || 3245 STps->last_block_visited != block) { 3246 STps->at_sm = 0; 3247 STps->rw = ST_IDLE; 3248 } 3249 } else 3250 STps->at_sm = 0; 3251 if (block == 0) 3252 STps->drv_block = STps->drv_file = 0; 3253 result = 0; 3254 } 3255 3256 st_release_request(SRpnt); 3257 SRpnt = NULL; 3258 3259 return result; 3260 } 3261 3262 3263 /* Find the current partition number for the drive status. Called from open and 3264 returns either partition number of negative error code. */ 3265 static int find_partition(struct scsi_tape *STp) 3266 { 3267 int i, partition; 3268 unsigned int block; 3269 3270 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3271 return i; 3272 if (partition >= ST_NBR_PARTITIONS) 3273 return (-EIO); 3274 return partition; 3275 } 3276 3277 3278 /* Change the partition if necessary */ 3279 static int switch_partition(struct scsi_tape *STp) 3280 { 3281 struct st_partstat *STps; 3282 3283 if (STp->partition == STp->new_partition) 3284 return 0; 3285 STps = &(STp->ps[STp->new_partition]); 3286 if (!STps->last_block_valid) 3287 STps->last_block_visited = 0; 3288 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3289 } 3290 3291 /* Functions for reading and writing the medium partition mode page. */ 3292 3293 #define PART_PAGE 0x11 3294 #define PART_PAGE_FIXED_LENGTH 8 3295 3296 #define PP_OFF_MAX_ADD_PARTS 2 3297 #define PP_OFF_NBR_ADD_PARTS 3 3298 #define PP_OFF_FLAGS 4 3299 #define PP_OFF_PART_UNITS 6 3300 #define PP_OFF_RESERVED 7 3301 3302 #define PP_BIT_IDP 0x20 3303 #define PP_BIT_FDP 0x80 3304 #define PP_MSK_PSUM_MB 0x10 3305 #define PP_MSK_PSUM_UNITS 0x18 3306 #define PP_MSK_POFM 0x04 3307 3308 /* Get the number of partitions on the tape. As a side effect reads the 3309 mode page into the tape buffer. */ 3310 static int nbr_partitions(struct scsi_tape *STp) 3311 { 3312 int result; 3313 3314 if (STp->ready != ST_READY) 3315 return (-EIO); 3316 3317 result = read_mode_page(STp, PART_PAGE, 1); 3318 3319 if (result) { 3320 DEBC_printk(STp, "Can't read medium partition page.\n"); 3321 result = (-EIO); 3322 } else { 3323 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3324 PP_OFF_NBR_ADD_PARTS] + 1; 3325 DEBC_printk(STp, "Number of partitions %d.\n", result); 3326 } 3327 3328 return result; 3329 } 3330 3331 3332 static int format_medium(struct scsi_tape *STp, int format) 3333 { 3334 int result = 0; 3335 int timeout = STp->long_timeout; 3336 unsigned char scmd[MAX_COMMAND_SIZE]; 3337 struct st_request *SRpnt; 3338 3339 memset(scmd, 0, MAX_COMMAND_SIZE); 3340 scmd[0] = FORMAT_UNIT; 3341 scmd[2] = format; 3342 if (STp->immediate) { 3343 scmd[1] |= 1; /* Don't wait for completion */ 3344 timeout = STp->device->request_queue->rq_timeout; 3345 } 3346 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3347 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3348 timeout, MAX_RETRIES, 1); 3349 if (!SRpnt) 3350 result = STp->buffer->syscall_result; 3351 return result; 3352 } 3353 3354 3355 /* Partition the tape into two partitions if size > 0 or one partition if 3356 size == 0. 3357 3358 The block descriptors are read and written because Sony SDT-7000 does not 3359 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3360 3361 My HP C1533A drive returns only one partition size field. This is used to 3362 set the size of partition 1. There is no size field for the default partition. 3363 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3364 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3365 The following algorithm is used to accommodate both drives: if the number of 3366 partition size fields is greater than the maximum number of additional partitions 3367 in the mode page, the second field is used. Otherwise the first field is used. 3368 3369 For Seagate DDS drives the page length must be 8 when no partitions is defined 3370 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3371 is acceptable also to some other old drives and enforced if the first partition 3372 size field is used for the first additional partition size. 3373 3374 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3375 */ 3376 static int partition_tape(struct scsi_tape *STp, int size) 3377 { 3378 int result; 3379 int target_partition; 3380 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3381 int pgo, psd_cnt, psdo; 3382 int psum = PP_MSK_PSUM_MB, units = 0; 3383 unsigned char *bp; 3384 3385 result = read_mode_page(STp, PART_PAGE, 0); 3386 if (result) { 3387 DEBC_printk(STp, "Can't read partition mode page.\n"); 3388 return result; 3389 } 3390 target_partition = 1; 3391 if (size < 0) { 3392 target_partition = 0; 3393 size = -size; 3394 } 3395 3396 /* The mode page is in the buffer. Let's modify it and write it. */ 3397 bp = (STp->buffer)->b_data; 3398 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3399 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3400 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3401 3402 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3403 3404 if (scsi3) { 3405 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3406 if (needs_format && size == 0) { 3407 /* No need to write the mode page when clearing 3408 * partitioning 3409 */ 3410 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3411 result = format_medium(STp, 0); 3412 goto out; 3413 } 3414 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3415 psd_cnt = 2; 3416 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3417 /* Use units scaling for large partitions if the device 3418 * suggests it and no precision lost. Required for IBM 3419 * TS1140/50 drives that don't support MB units. 3420 */ 3421 if (size >= 1000 && (size % 1000) == 0) { 3422 size /= 1000; 3423 psum = PP_MSK_PSUM_UNITS; 3424 units = 9; /* GB */ 3425 } 3426 } 3427 /* Try it anyway if too large to specify in MB */ 3428 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3429 size /= 1000; 3430 psum = PP_MSK_PSUM_UNITS; 3431 units = 9; /* GB */ 3432 } 3433 } 3434 3435 if (size >= 65535 || /* Does not fit into two bytes */ 3436 (target_partition == 0 && psd_cnt < 2)) { 3437 result = -EINVAL; 3438 goto out; 3439 } 3440 3441 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3442 /* The second condition is for HP DDS which use only one partition size 3443 * descriptor 3444 */ 3445 if (target_partition > 0 && 3446 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3447 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3448 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3449 psdo += 2; 3450 } 3451 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3452 3453 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3454 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3455 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3456 3457 if (size == 0) { 3458 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3459 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3460 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3461 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3462 } else { 3463 bp[psdo] = (size >> 8) & 0xff; 3464 bp[psdo + 1] = size & 0xff; 3465 if (target_partition == 0) 3466 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3467 bp[pgo + 3] = 1; 3468 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3469 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3470 DEBC_printk(STp, 3471 "Formatting tape with two partitions (%i = %d MB).\n", 3472 target_partition, units > 0 ? size * 1000 : size); 3473 } 3474 bp[pgo + PP_OFF_PART_UNITS] = 0; 3475 bp[pgo + PP_OFF_RESERVED] = 0; 3476 if (size != 1 || units != 0) { 3477 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3478 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3479 bp[pgo + PP_OFF_PART_UNITS] = units; 3480 } else 3481 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3482 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3483 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3484 3485 result = write_mode_page(STp, PART_PAGE, 1); 3486 3487 if (!result && needs_format) 3488 result = format_medium(STp, 1); 3489 3490 if (result) { 3491 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3492 result = (-EIO); 3493 } 3494 3495 out: 3496 return result; 3497 } 3498 3499 3500 3501 /* The ioctl command */ 3502 static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p) 3503 { 3504 int i, cmd_nr, cmd_type, bt; 3505 int retval = 0; 3506 unsigned int blk; 3507 struct scsi_tape *STp = file->private_data; 3508 struct st_modedef *STm; 3509 struct st_partstat *STps; 3510 3511 if (mutex_lock_interruptible(&STp->lock)) 3512 return -ERESTARTSYS; 3513 3514 DEB( 3515 if (debugging && !STp->in_use) { 3516 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3517 retval = (-EIO); 3518 goto out; 3519 } ) /* end DEB */ 3520 3521 STm = &(STp->modes[STp->current_mode]); 3522 STps = &(STp->ps[STp->partition]); 3523 3524 /* 3525 * If we are in the middle of error recovery, don't let anyone 3526 * else try and use this device. Also, if error recovery fails, it 3527 * may try and take the device offline, in which case all further 3528 * access to the device is prohibited. 3529 */ 3530 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3531 file->f_flags & O_NDELAY); 3532 if (retval) 3533 goto out; 3534 3535 cmd_type = _IOC_TYPE(cmd_in); 3536 cmd_nr = _IOC_NR(cmd_in); 3537 3538 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3539 struct mtop mtc; 3540 3541 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3542 retval = (-EINVAL); 3543 goto out; 3544 } 3545 3546 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3547 if (i) { 3548 retval = (-EFAULT); 3549 goto out; 3550 } 3551 3552 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3553 st_printk(KERN_WARNING, STp, 3554 "MTSETDRVBUFFER only allowed for root.\n"); 3555 retval = (-EPERM); 3556 goto out; 3557 } 3558 if (!STm->defined && 3559 (mtc.mt_op != MTSETDRVBUFFER && 3560 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3561 retval = (-ENXIO); 3562 goto out; 3563 } 3564 3565 if (!STp->pos_unknown) { 3566 3567 if (STps->eof == ST_FM_HIT) { 3568 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3569 mtc.mt_op == MTEOM) { 3570 mtc.mt_count -= 1; 3571 if (STps->drv_file >= 0) 3572 STps->drv_file += 1; 3573 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3574 mtc.mt_count += 1; 3575 if (STps->drv_file >= 0) 3576 STps->drv_file += 1; 3577 } 3578 } 3579 3580 if (mtc.mt_op == MTSEEK) { 3581 /* Old position must be restored if partition will be 3582 changed */ 3583 i = !STp->can_partitions || 3584 (STp->new_partition != STp->partition); 3585 } else { 3586 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3587 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3588 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3589 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3590 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3591 mtc.mt_op == MTCOMPRESSION; 3592 } 3593 i = flush_buffer(STp, i); 3594 if (i < 0) { 3595 retval = i; 3596 goto out; 3597 } 3598 if (STps->rw == ST_WRITING && 3599 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3600 mtc.mt_op == MTSEEK || 3601 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3602 i = st_int_ioctl(STp, MTWEOF, 1); 3603 if (i < 0) { 3604 retval = i; 3605 goto out; 3606 } 3607 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3608 mtc.mt_count++; 3609 STps->rw = ST_IDLE; 3610 } 3611 3612 } else { 3613 /* 3614 * If there was a bus reset, block further access 3615 * to this device. If the user wants to rewind the tape, 3616 * then reset the flag and allow access again. 3617 */ 3618 if (mtc.mt_op != MTREW && 3619 mtc.mt_op != MTOFFL && 3620 mtc.mt_op != MTRETEN && 3621 mtc.mt_op != MTERASE && 3622 mtc.mt_op != MTSEEK && 3623 mtc.mt_op != MTEOM) { 3624 retval = (-EIO); 3625 goto out; 3626 } 3627 reset_state(STp); 3628 /* remove this when the midlevel properly clears was_reset */ 3629 STp->device->was_reset = 0; 3630 } 3631 3632 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3633 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3634 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3635 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3636 3637 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3638 do_door_lock(STp, 0); /* Ignore result! */ 3639 3640 if (mtc.mt_op == MTSETDRVBUFFER && 3641 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3642 retval = st_set_options(STp, mtc.mt_count); 3643 goto out; 3644 } 3645 3646 if (mtc.mt_op == MTSETPART) { 3647 if (!STp->can_partitions || 3648 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3649 retval = (-EINVAL); 3650 goto out; 3651 } 3652 if (mtc.mt_count >= STp->nbr_partitions && 3653 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3654 retval = (-EIO); 3655 goto out; 3656 } 3657 if (mtc.mt_count >= STp->nbr_partitions) { 3658 retval = (-EINVAL); 3659 goto out; 3660 } 3661 STp->new_partition = mtc.mt_count; 3662 retval = 0; 3663 goto out; 3664 } 3665 3666 if (mtc.mt_op == MTMKPART) { 3667 if (!STp->can_partitions) { 3668 retval = (-EINVAL); 3669 goto out; 3670 } 3671 i = do_load_unload(STp, file, 1); 3672 if (i < 0) { 3673 retval = i; 3674 goto out; 3675 } 3676 i = partition_tape(STp, mtc.mt_count); 3677 if (i < 0) { 3678 retval = i; 3679 goto out; 3680 } 3681 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3682 STp->ps[i].rw = ST_IDLE; 3683 STp->ps[i].at_sm = 0; 3684 STp->ps[i].last_block_valid = 0; 3685 } 3686 STp->partition = STp->new_partition = 0; 3687 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3688 STps->drv_block = STps->drv_file = 0; 3689 retval = 0; 3690 goto out; 3691 } 3692 3693 if (mtc.mt_op == MTSEEK) { 3694 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3695 if (!STp->can_partitions) 3696 STp->ps[0].rw = ST_IDLE; 3697 retval = i; 3698 goto out; 3699 } 3700 3701 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3702 retval = do_load_unload(STp, file, 0); 3703 goto out; 3704 } 3705 3706 if (mtc.mt_op == MTLOAD) { 3707 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3708 goto out; 3709 } 3710 3711 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3712 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3713 goto out; 3714 } 3715 3716 if (STp->can_partitions && STp->ready == ST_READY && 3717 (i = switch_partition(STp)) < 0) { 3718 retval = i; 3719 goto out; 3720 } 3721 3722 if (mtc.mt_op == MTCOMPRESSION) 3723 retval = st_compression(STp, (mtc.mt_count & 1)); 3724 else 3725 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3726 goto out; 3727 } 3728 if (!STm->defined) { 3729 retval = (-ENXIO); 3730 goto out; 3731 } 3732 3733 if ((i = flush_buffer(STp, 0)) < 0) { 3734 retval = i; 3735 goto out; 3736 } 3737 if (STp->can_partitions && 3738 (i = switch_partition(STp)) < 0) { 3739 retval = i; 3740 goto out; 3741 } 3742 3743 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3744 struct mtget mt_status; 3745 3746 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3747 retval = (-EINVAL); 3748 goto out; 3749 } 3750 3751 mt_status.mt_type = STp->tape_type; 3752 mt_status.mt_dsreg = 3753 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3754 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3755 mt_status.mt_blkno = STps->drv_block; 3756 mt_status.mt_fileno = STps->drv_file; 3757 if (STp->block_size != 0) { 3758 if (STps->rw == ST_WRITING) 3759 mt_status.mt_blkno += 3760 (STp->buffer)->buffer_bytes / STp->block_size; 3761 else if (STps->rw == ST_READING) 3762 mt_status.mt_blkno -= 3763 ((STp->buffer)->buffer_bytes + 3764 STp->block_size - 1) / STp->block_size; 3765 } 3766 3767 mt_status.mt_gstat = 0; 3768 if (STp->drv_write_prot) 3769 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3770 if (mt_status.mt_blkno == 0) { 3771 if (mt_status.mt_fileno == 0) 3772 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3773 else 3774 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3775 } 3776 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3777 mt_status.mt_resid = STp->partition; 3778 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3779 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3780 else if (STps->eof >= ST_EOM_OK) 3781 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3782 if (STp->density == 1) 3783 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3784 else if (STp->density == 2) 3785 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3786 else if (STp->density == 3) 3787 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3788 if (STp->ready == ST_READY) 3789 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3790 if (STp->ready == ST_NO_TAPE) 3791 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3792 if (STps->at_sm) 3793 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3794 if (STm->do_async_writes || 3795 (STm->do_buffer_writes && STp->block_size != 0) || 3796 STp->drv_buffer != 0) 3797 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3798 if (STp->cleaning_req) 3799 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3800 3801 retval = put_user_mtget(p, &mt_status); 3802 if (retval) 3803 goto out; 3804 3805 STp->recover_reg = 0; /* Clear after read */ 3806 goto out; 3807 } /* End of MTIOCGET */ 3808 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3809 struct mtpos mt_pos; 3810 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3811 retval = (-EINVAL); 3812 goto out; 3813 } 3814 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3815 retval = i; 3816 goto out; 3817 } 3818 mt_pos.mt_blkno = blk; 3819 retval = put_user_mtpos(p, &mt_pos); 3820 goto out; 3821 } 3822 mutex_unlock(&STp->lock); 3823 switch (cmd_in) { 3824 case SCSI_IOCTL_STOP_UNIT: 3825 /* unload */ 3826 retval = scsi_ioctl(STp->device, cmd_in, p); 3827 if (!retval) { 3828 STp->rew_at_close = 0; 3829 STp->ready = ST_NO_TAPE; 3830 } 3831 return retval; 3832 3833 case SCSI_IOCTL_GET_IDLUN: 3834 case SCSI_IOCTL_GET_BUS_NUMBER: 3835 break; 3836 3837 default: 3838 if ((cmd_in == SG_IO || 3839 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3840 cmd_in == CDROM_SEND_PACKET) && 3841 !capable(CAP_SYS_RAWIO)) 3842 i = -EPERM; 3843 else 3844 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3845 file->f_mode, cmd_in, p); 3846 if (i != -ENOTTY) 3847 return i; 3848 break; 3849 } 3850 return -ENOTTY; 3851 3852 out: 3853 mutex_unlock(&STp->lock); 3854 return retval; 3855 } 3856 3857 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3858 { 3859 void __user *p = (void __user *)arg; 3860 struct scsi_tape *STp = file->private_data; 3861 int ret; 3862 3863 ret = st_ioctl_common(file, cmd_in, p); 3864 if (ret != -ENOTTY) 3865 return ret; 3866 3867 return scsi_ioctl(STp->device, cmd_in, p); 3868 } 3869 3870 #ifdef CONFIG_COMPAT 3871 static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3872 { 3873 void __user *p = compat_ptr(arg); 3874 struct scsi_tape *STp = file->private_data; 3875 int ret; 3876 3877 /* argument conversion is handled using put_user_mtpos/put_user_mtget */ 3878 switch (cmd_in) { 3879 case MTIOCPOS32: 3880 return st_ioctl_common(file, MTIOCPOS, p); 3881 case MTIOCGET32: 3882 return st_ioctl_common(file, MTIOCGET, p); 3883 } 3884 3885 ret = st_ioctl_common(file, cmd_in, p); 3886 if (ret != -ENOTTY) 3887 return ret; 3888 3889 return scsi_compat_ioctl(STp->device, cmd_in, p); 3890 } 3891 #endif 3892 3893 3894 3895 /* Try to allocate a new tape buffer. Calling function must not hold 3896 dev_arr_lock. */ 3897 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3898 { 3899 struct st_buffer *tb; 3900 3901 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3902 if (!tb) { 3903 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3904 return NULL; 3905 } 3906 tb->frp_segs = 0; 3907 tb->use_sg = max_sg; 3908 tb->dma = need_dma; 3909 tb->buffer_size = 0; 3910 3911 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3912 GFP_KERNEL); 3913 if (!tb->reserved_pages) { 3914 kfree(tb); 3915 return NULL; 3916 } 3917 3918 return tb; 3919 } 3920 3921 3922 /* Try to allocate enough space in the tape buffer */ 3923 #define ST_MAX_ORDER 6 3924 3925 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3926 { 3927 int segs, max_segs, b_size, order, got; 3928 gfp_t priority; 3929 3930 if (new_size <= STbuffer->buffer_size) 3931 return 1; 3932 3933 if (STbuffer->buffer_size <= PAGE_SIZE) 3934 normalize_buffer(STbuffer); /* Avoid extra segment */ 3935 3936 max_segs = STbuffer->use_sg; 3937 3938 priority = GFP_KERNEL | __GFP_NOWARN; 3939 if (need_dma) 3940 priority |= GFP_DMA; 3941 3942 if (STbuffer->cleared) 3943 priority |= __GFP_ZERO; 3944 3945 if (STbuffer->frp_segs) { 3946 order = STbuffer->reserved_page_order; 3947 b_size = PAGE_SIZE << order; 3948 } else { 3949 for (b_size = PAGE_SIZE, order = 0; 3950 order < ST_MAX_ORDER && 3951 max_segs * (PAGE_SIZE << order) < new_size; 3952 order++, b_size *= 2) 3953 ; /* empty */ 3954 STbuffer->reserved_page_order = order; 3955 } 3956 if (max_segs * (PAGE_SIZE << order) < new_size) { 3957 if (order == ST_MAX_ORDER) 3958 return 0; 3959 normalize_buffer(STbuffer); 3960 return enlarge_buffer(STbuffer, new_size, need_dma); 3961 } 3962 3963 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3964 segs < max_segs && got < new_size;) { 3965 struct page *page; 3966 3967 page = alloc_pages(priority, order); 3968 if (!page) { 3969 DEB(STbuffer->buffer_size = got); 3970 normalize_buffer(STbuffer); 3971 return 0; 3972 } 3973 3974 STbuffer->frp_segs += 1; 3975 got += b_size; 3976 STbuffer->buffer_size = got; 3977 STbuffer->reserved_pages[segs] = page; 3978 segs++; 3979 } 3980 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3981 3982 return 1; 3983 } 3984 3985 3986 /* Make sure that no data from previous user is in the internal buffer */ 3987 static void clear_buffer(struct st_buffer * st_bp) 3988 { 3989 int i; 3990 3991 for (i=0; i < st_bp->frp_segs; i++) 3992 memset(page_address(st_bp->reserved_pages[i]), 0, 3993 PAGE_SIZE << st_bp->reserved_page_order); 3994 st_bp->cleared = 1; 3995 } 3996 3997 3998 /* Release the extra buffer */ 3999 static void normalize_buffer(struct st_buffer * STbuffer) 4000 { 4001 int i, order = STbuffer->reserved_page_order; 4002 4003 for (i = 0; i < STbuffer->frp_segs; i++) { 4004 __free_pages(STbuffer->reserved_pages[i], order); 4005 STbuffer->buffer_size -= (PAGE_SIZE << order); 4006 } 4007 STbuffer->frp_segs = 0; 4008 STbuffer->sg_segs = 0; 4009 STbuffer->reserved_page_order = 0; 4010 STbuffer->map_data.offset = 0; 4011 } 4012 4013 4014 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 4015 negative error code. */ 4016 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 4017 { 4018 int i, cnt, res, offset; 4019 int length = PAGE_SIZE << st_bp->reserved_page_order; 4020 4021 for (i = 0, offset = st_bp->buffer_bytes; 4022 i < st_bp->frp_segs && offset >= length; i++) 4023 offset -= length; 4024 if (i == st_bp->frp_segs) { /* Should never happen */ 4025 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4026 return (-EIO); 4027 } 4028 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4029 struct page *page = st_bp->reserved_pages[i]; 4030 cnt = length - offset < do_count ? length - offset : do_count; 4031 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4032 if (res) 4033 return (-EFAULT); 4034 do_count -= cnt; 4035 st_bp->buffer_bytes += cnt; 4036 ubp += cnt; 4037 offset = 0; 4038 } 4039 if (do_count) /* Should never happen */ 4040 return (-EIO); 4041 4042 return 0; 4043 } 4044 4045 4046 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4047 negative error code. */ 4048 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4049 { 4050 int i, cnt, res, offset; 4051 int length = PAGE_SIZE << st_bp->reserved_page_order; 4052 4053 for (i = 0, offset = st_bp->read_pointer; 4054 i < st_bp->frp_segs && offset >= length; i++) 4055 offset -= length; 4056 if (i == st_bp->frp_segs) { /* Should never happen */ 4057 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4058 return (-EIO); 4059 } 4060 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4061 struct page *page = st_bp->reserved_pages[i]; 4062 cnt = length - offset < do_count ? length - offset : do_count; 4063 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4064 if (res) 4065 return (-EFAULT); 4066 do_count -= cnt; 4067 st_bp->buffer_bytes -= cnt; 4068 st_bp->read_pointer += cnt; 4069 ubp += cnt; 4070 offset = 0; 4071 } 4072 if (do_count) /* Should never happen */ 4073 return (-EIO); 4074 4075 return 0; 4076 } 4077 4078 4079 /* Move data towards start of buffer */ 4080 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4081 { 4082 int src_seg, dst_seg, src_offset = 0, dst_offset; 4083 int count, total; 4084 int length = PAGE_SIZE << st_bp->reserved_page_order; 4085 4086 if (offset == 0) 4087 return; 4088 4089 total=st_bp->buffer_bytes - offset; 4090 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4091 src_offset = offset; 4092 if (src_offset < length) 4093 break; 4094 offset -= length; 4095 } 4096 4097 st_bp->buffer_bytes = st_bp->read_pointer = total; 4098 for (dst_seg=dst_offset=0; total > 0; ) { 4099 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4100 struct page *spage = st_bp->reserved_pages[src_seg]; 4101 4102 count = min(length - dst_offset, length - src_offset); 4103 memmove(page_address(dpage) + dst_offset, 4104 page_address(spage) + src_offset, count); 4105 src_offset += count; 4106 if (src_offset >= length) { 4107 src_seg++; 4108 src_offset = 0; 4109 } 4110 dst_offset += count; 4111 if (dst_offset >= length) { 4112 dst_seg++; 4113 dst_offset = 0; 4114 } 4115 total -= count; 4116 } 4117 } 4118 4119 /* Validate the options from command line or module parameters */ 4120 static void validate_options(void) 4121 { 4122 if (buffer_kbs > 0) 4123 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4124 if (max_sg_segs >= ST_FIRST_SG) 4125 st_max_sg_segs = max_sg_segs; 4126 } 4127 4128 #ifndef MODULE 4129 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4130 */ 4131 static int __init st_setup(char *str) 4132 { 4133 int i, len, ints[5]; 4134 char *stp; 4135 4136 stp = get_options(str, ARRAY_SIZE(ints), ints); 4137 4138 if (ints[0] > 0) { 4139 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4140 if (parms[i].val) 4141 *parms[i].val = ints[i + 1]; 4142 } else { 4143 while (stp != NULL) { 4144 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4145 len = strlen(parms[i].name); 4146 if (!strncmp(stp, parms[i].name, len) && 4147 (*(stp + len) == ':' || *(stp + len) == '=')) { 4148 if (parms[i].val) 4149 *parms[i].val = 4150 simple_strtoul(stp + len + 1, NULL, 0); 4151 else 4152 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4153 parms[i].name); 4154 break; 4155 } 4156 } 4157 if (i >= ARRAY_SIZE(parms)) 4158 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4159 stp); 4160 stp = strchr(stp, ','); 4161 if (stp) 4162 stp++; 4163 } 4164 } 4165 4166 validate_options(); 4167 4168 return 1; 4169 } 4170 4171 __setup("st=", st_setup); 4172 4173 #endif 4174 4175 static const struct file_operations st_fops = 4176 { 4177 .owner = THIS_MODULE, 4178 .read = st_read, 4179 .write = st_write, 4180 .unlocked_ioctl = st_ioctl, 4181 #ifdef CONFIG_COMPAT 4182 .compat_ioctl = st_compat_ioctl, 4183 #endif 4184 .open = st_open, 4185 .flush = st_flush, 4186 .release = st_release, 4187 .llseek = noop_llseek, 4188 }; 4189 4190 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4191 { 4192 int i, error; 4193 dev_t cdev_devno; 4194 struct cdev *cdev; 4195 struct device *dev; 4196 struct st_modedef *STm = &(tape->modes[mode]); 4197 char name[10]; 4198 int dev_num = tape->index; 4199 4200 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4201 4202 cdev = cdev_alloc(); 4203 if (!cdev) { 4204 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4205 error = -ENOMEM; 4206 goto out; 4207 } 4208 cdev->owner = THIS_MODULE; 4209 cdev->ops = &st_fops; 4210 STm->cdevs[rew] = cdev; 4211 4212 error = cdev_add(cdev, cdev_devno, 1); 4213 if (error) { 4214 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4215 rew ? "non" : "auto", mode); 4216 pr_err("st%d: Device not attached.\n", dev_num); 4217 goto out_free; 4218 } 4219 4220 i = mode << (4 - ST_NBR_MODE_BITS); 4221 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4222 tape->disk->disk_name, st_formats[i]); 4223 4224 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4225 cdev_devno, &tape->modes[mode], "%s", name); 4226 if (IS_ERR(dev)) { 4227 pr_err("st%d: device_create failed\n", dev_num); 4228 error = PTR_ERR(dev); 4229 goto out_free; 4230 } 4231 4232 STm->devs[rew] = dev; 4233 4234 return 0; 4235 out_free: 4236 cdev_del(STm->cdevs[rew]); 4237 out: 4238 STm->cdevs[rew] = NULL; 4239 STm->devs[rew] = NULL; 4240 return error; 4241 } 4242 4243 static int create_cdevs(struct scsi_tape *tape) 4244 { 4245 int mode, error; 4246 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4247 error = create_one_cdev(tape, mode, 0); 4248 if (error) 4249 return error; 4250 error = create_one_cdev(tape, mode, 1); 4251 if (error) 4252 return error; 4253 } 4254 4255 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4256 &tape->modes[0].devs[0]->kobj, "tape"); 4257 } 4258 4259 static void remove_cdevs(struct scsi_tape *tape) 4260 { 4261 int mode, rew; 4262 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4263 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4264 struct st_modedef *STm = &(tape->modes[mode]); 4265 for (rew = 0; rew < 2; rew++) { 4266 if (STm->cdevs[rew]) 4267 cdev_del(STm->cdevs[rew]); 4268 if (STm->devs[rew]) 4269 device_unregister(STm->devs[rew]); 4270 } 4271 } 4272 } 4273 4274 static int st_probe(struct device *dev) 4275 { 4276 struct scsi_device *SDp = to_scsi_device(dev); 4277 struct gendisk *disk = NULL; 4278 struct scsi_tape *tpnt = NULL; 4279 struct st_modedef *STm; 4280 struct st_partstat *STps; 4281 struct st_buffer *buffer; 4282 int i, error; 4283 char *stp; 4284 4285 if (SDp->type != TYPE_TAPE) 4286 return -ENODEV; 4287 if ((stp = st_incompatible(SDp))) { 4288 sdev_printk(KERN_INFO, SDp, 4289 "OnStream tapes are no longer supported;\n"); 4290 sdev_printk(KERN_INFO, SDp, 4291 "please mail to linux-scsi@vger.kernel.org.\n"); 4292 return -ENODEV; 4293 } 4294 4295 scsi_autopm_get_device(SDp); 4296 i = queue_max_segments(SDp->request_queue); 4297 if (st_max_sg_segs < i) 4298 i = st_max_sg_segs; 4299 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4300 if (buffer == NULL) { 4301 sdev_printk(KERN_ERR, SDp, 4302 "st: Can't allocate new tape buffer. " 4303 "Device not attached.\n"); 4304 goto out; 4305 } 4306 4307 disk = alloc_disk(1); 4308 if (!disk) { 4309 sdev_printk(KERN_ERR, SDp, 4310 "st: out of memory. Device not attached.\n"); 4311 goto out_buffer_free; 4312 } 4313 4314 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4315 if (tpnt == NULL) { 4316 sdev_printk(KERN_ERR, SDp, 4317 "st: Can't allocate device descriptor.\n"); 4318 goto out_put_disk; 4319 } 4320 kref_init(&tpnt->kref); 4321 tpnt->disk = disk; 4322 disk->private_data = &tpnt->driver; 4323 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4324 * take queue reference that release_disk() expects. */ 4325 if (!blk_get_queue(SDp->request_queue)) 4326 goto out_put_disk; 4327 disk->queue = SDp->request_queue; 4328 tpnt->driver = &st_template; 4329 4330 tpnt->device = SDp; 4331 if (SDp->scsi_level <= 2) 4332 tpnt->tape_type = MT_ISSCSI1; 4333 else 4334 tpnt->tape_type = MT_ISSCSI2; 4335 4336 tpnt->buffer = buffer; 4337 tpnt->buffer->last_SRpnt = NULL; 4338 4339 tpnt->inited = 0; 4340 tpnt->dirty = 0; 4341 tpnt->in_use = 0; 4342 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4343 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4344 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4345 tpnt->density = 0; 4346 tpnt->do_auto_lock = ST_AUTO_LOCK; 4347 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4348 tpnt->can_partitions = 0; 4349 tpnt->two_fm = ST_TWO_FM; 4350 tpnt->fast_mteom = ST_FAST_MTEOM; 4351 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4352 tpnt->sili = ST_SILI; 4353 tpnt->immediate = ST_NOWAIT; 4354 tpnt->immediate_filemark = 0; 4355 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4356 tpnt->partition = 0; 4357 tpnt->new_partition = 0; 4358 tpnt->nbr_partitions = 0; 4359 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4360 tpnt->long_timeout = ST_LONG_TIMEOUT; 4361 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4362 4363 for (i = 0; i < ST_NBR_MODES; i++) { 4364 STm = &(tpnt->modes[i]); 4365 STm->defined = 0; 4366 STm->sysv = ST_SYSV; 4367 STm->defaults_for_writes = 0; 4368 STm->do_async_writes = ST_ASYNC_WRITES; 4369 STm->do_buffer_writes = ST_BUFFER_WRITES; 4370 STm->do_read_ahead = ST_READ_AHEAD; 4371 STm->default_compression = ST_DONT_TOUCH; 4372 STm->default_blksize = (-1); /* No forced size */ 4373 STm->default_density = (-1); /* No forced density */ 4374 STm->tape = tpnt; 4375 } 4376 4377 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4378 STps = &(tpnt->ps[i]); 4379 STps->rw = ST_IDLE; 4380 STps->eof = ST_NOEOF; 4381 STps->at_sm = 0; 4382 STps->last_block_valid = 0; 4383 STps->drv_block = (-1); 4384 STps->drv_file = (-1); 4385 } 4386 4387 tpnt->current_mode = 0; 4388 tpnt->modes[0].defined = 1; 4389 4390 tpnt->density_changed = tpnt->compression_changed = 4391 tpnt->blksize_changed = 0; 4392 mutex_init(&tpnt->lock); 4393 4394 idr_preload(GFP_KERNEL); 4395 spin_lock(&st_index_lock); 4396 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4397 spin_unlock(&st_index_lock); 4398 idr_preload_end(); 4399 if (error < 0) { 4400 pr_warn("st: idr allocation failed: %d\n", error); 4401 goto out_put_queue; 4402 } 4403 tpnt->index = error; 4404 sprintf(disk->disk_name, "st%d", tpnt->index); 4405 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4406 if (tpnt->stats == NULL) { 4407 sdev_printk(KERN_ERR, SDp, 4408 "st: Can't allocate statistics.\n"); 4409 goto out_idr_remove; 4410 } 4411 4412 dev_set_drvdata(dev, tpnt); 4413 4414 4415 error = create_cdevs(tpnt); 4416 if (error) 4417 goto out_remove_devs; 4418 scsi_autopm_put_device(SDp); 4419 4420 sdev_printk(KERN_NOTICE, SDp, 4421 "Attached scsi tape %s\n", tape_name(tpnt)); 4422 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4423 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4424 queue_dma_alignment(SDp->request_queue) + 1); 4425 4426 return 0; 4427 4428 out_remove_devs: 4429 remove_cdevs(tpnt); 4430 kfree(tpnt->stats); 4431 out_idr_remove: 4432 spin_lock(&st_index_lock); 4433 idr_remove(&st_index_idr, tpnt->index); 4434 spin_unlock(&st_index_lock); 4435 out_put_queue: 4436 blk_put_queue(disk->queue); 4437 out_put_disk: 4438 put_disk(disk); 4439 kfree(tpnt); 4440 out_buffer_free: 4441 kfree(buffer); 4442 out: 4443 scsi_autopm_put_device(SDp); 4444 return -ENODEV; 4445 }; 4446 4447 4448 static int st_remove(struct device *dev) 4449 { 4450 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4451 int index = tpnt->index; 4452 4453 scsi_autopm_get_device(to_scsi_device(dev)); 4454 remove_cdevs(tpnt); 4455 4456 mutex_lock(&st_ref_mutex); 4457 kref_put(&tpnt->kref, scsi_tape_release); 4458 mutex_unlock(&st_ref_mutex); 4459 spin_lock(&st_index_lock); 4460 idr_remove(&st_index_idr, index); 4461 spin_unlock(&st_index_lock); 4462 return 0; 4463 } 4464 4465 /** 4466 * scsi_tape_release - Called to free the Scsi_Tape structure 4467 * @kref: pointer to embedded kref 4468 * 4469 * st_ref_mutex must be held entering this routine. Because it is 4470 * called on last put, you should always use the scsi_tape_get() 4471 * scsi_tape_put() helpers which manipulate the semaphore directly 4472 * and never do a direct kref_put(). 4473 **/ 4474 static void scsi_tape_release(struct kref *kref) 4475 { 4476 struct scsi_tape *tpnt = to_scsi_tape(kref); 4477 struct gendisk *disk = tpnt->disk; 4478 4479 tpnt->device = NULL; 4480 4481 if (tpnt->buffer) { 4482 normalize_buffer(tpnt->buffer); 4483 kfree(tpnt->buffer->reserved_pages); 4484 kfree(tpnt->buffer); 4485 } 4486 4487 disk->private_data = NULL; 4488 put_disk(disk); 4489 kfree(tpnt->stats); 4490 kfree(tpnt); 4491 return; 4492 } 4493 4494 static struct class st_sysfs_class = { 4495 .name = "scsi_tape", 4496 .dev_groups = st_dev_groups, 4497 }; 4498 4499 static int __init init_st(void) 4500 { 4501 int err; 4502 4503 validate_options(); 4504 4505 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4506 verstr, st_fixed_buffer_size, st_max_sg_segs); 4507 4508 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4509 if (debugging) { 4510 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4511 debugging); 4512 } 4513 4514 err = class_register(&st_sysfs_class); 4515 if (err) { 4516 pr_err("Unable register sysfs class for SCSI tapes\n"); 4517 return err; 4518 } 4519 4520 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4521 ST_MAX_TAPE_ENTRIES, "st"); 4522 if (err) { 4523 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4524 SCSI_TAPE_MAJOR); 4525 goto err_class; 4526 } 4527 4528 err = scsi_register_driver(&st_template.gendrv); 4529 if (err) 4530 goto err_chrdev; 4531 4532 return 0; 4533 4534 err_chrdev: 4535 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4536 ST_MAX_TAPE_ENTRIES); 4537 err_class: 4538 class_unregister(&st_sysfs_class); 4539 return err; 4540 } 4541 4542 static void __exit exit_st(void) 4543 { 4544 scsi_unregister_driver(&st_template.gendrv); 4545 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4546 ST_MAX_TAPE_ENTRIES); 4547 class_unregister(&st_sysfs_class); 4548 idr_destroy(&st_index_idr); 4549 printk(KERN_INFO "st: Unloaded.\n"); 4550 } 4551 4552 module_init(init_st); 4553 module_exit(exit_st); 4554 4555 4556 /* The sysfs driver interface. Read-only at the moment */ 4557 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4558 { 4559 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4560 } 4561 static DRIVER_ATTR_RO(try_direct_io); 4562 4563 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4564 { 4565 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4566 } 4567 static DRIVER_ATTR_RO(fixed_buffer_size); 4568 4569 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4570 { 4571 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4572 } 4573 static DRIVER_ATTR_RO(max_sg_segs); 4574 4575 static ssize_t version_show(struct device_driver *ddd, char *buf) 4576 { 4577 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4578 } 4579 static DRIVER_ATTR_RO(version); 4580 4581 #if DEBUG 4582 static ssize_t debug_flag_store(struct device_driver *ddp, 4583 const char *buf, size_t count) 4584 { 4585 /* We only care what the first byte of the data is the rest is unused. 4586 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4587 * other values have -EINVAL returned if they are passed in. 4588 */ 4589 if (count > 0) { 4590 if (buf[0] == '0') { 4591 debugging = NO_DEBUG; 4592 return count; 4593 } else if (buf[0] == '1') { 4594 debugging = 1; 4595 return count; 4596 } 4597 } 4598 return -EINVAL; 4599 } 4600 4601 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4602 { 4603 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4604 } 4605 static DRIVER_ATTR_RW(debug_flag); 4606 #endif 4607 4608 static struct attribute *st_drv_attrs[] = { 4609 &driver_attr_try_direct_io.attr, 4610 &driver_attr_fixed_buffer_size.attr, 4611 &driver_attr_max_sg_segs.attr, 4612 &driver_attr_version.attr, 4613 #if DEBUG 4614 &driver_attr_debug_flag.attr, 4615 #endif 4616 NULL, 4617 }; 4618 ATTRIBUTE_GROUPS(st_drv); 4619 4620 /* The sysfs simple class interface */ 4621 static ssize_t 4622 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4623 { 4624 struct st_modedef *STm = dev_get_drvdata(dev); 4625 ssize_t l = 0; 4626 4627 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4628 return l; 4629 } 4630 static DEVICE_ATTR_RO(defined); 4631 4632 static ssize_t 4633 default_blksize_show(struct device *dev, struct device_attribute *attr, 4634 char *buf) 4635 { 4636 struct st_modedef *STm = dev_get_drvdata(dev); 4637 ssize_t l = 0; 4638 4639 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4640 return l; 4641 } 4642 static DEVICE_ATTR_RO(default_blksize); 4643 4644 static ssize_t 4645 default_density_show(struct device *dev, struct device_attribute *attr, 4646 char *buf) 4647 { 4648 struct st_modedef *STm = dev_get_drvdata(dev); 4649 ssize_t l = 0; 4650 char *fmt; 4651 4652 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4653 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4654 return l; 4655 } 4656 static DEVICE_ATTR_RO(default_density); 4657 4658 static ssize_t 4659 default_compression_show(struct device *dev, struct device_attribute *attr, 4660 char *buf) 4661 { 4662 struct st_modedef *STm = dev_get_drvdata(dev); 4663 ssize_t l = 0; 4664 4665 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4666 return l; 4667 } 4668 static DEVICE_ATTR_RO(default_compression); 4669 4670 static ssize_t 4671 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4672 { 4673 struct st_modedef *STm = dev_get_drvdata(dev); 4674 struct scsi_tape *STp = STm->tape; 4675 int options; 4676 ssize_t l = 0; 4677 4678 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4679 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4680 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4681 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4682 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4683 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4684 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4685 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4686 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4687 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4688 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4689 options |= STm->sysv ? MT_ST_SYSV : 0; 4690 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4691 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4692 options |= STp->sili ? MT_ST_SILI : 0; 4693 4694 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4695 return l; 4696 } 4697 static DEVICE_ATTR_RO(options); 4698 4699 /* Support for tape stats */ 4700 4701 /** 4702 * read_cnt_show - return read count - count of reads made from tape drive 4703 * @dev: struct device 4704 * @attr: attribute structure 4705 * @buf: buffer to return formatted data in 4706 */ 4707 static ssize_t read_cnt_show(struct device *dev, 4708 struct device_attribute *attr, char *buf) 4709 { 4710 struct st_modedef *STm = dev_get_drvdata(dev); 4711 4712 return sprintf(buf, "%lld", 4713 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4714 } 4715 static DEVICE_ATTR_RO(read_cnt); 4716 4717 /** 4718 * read_byte_cnt_show - return read byte count - tape drives 4719 * may use blocks less than 512 bytes this gives the raw byte count of 4720 * of data read from the tape drive. 4721 * @dev: struct device 4722 * @attr: attribute structure 4723 * @buf: buffer to return formatted data in 4724 */ 4725 static ssize_t read_byte_cnt_show(struct device *dev, 4726 struct device_attribute *attr, char *buf) 4727 { 4728 struct st_modedef *STm = dev_get_drvdata(dev); 4729 4730 return sprintf(buf, "%lld", 4731 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4732 } 4733 static DEVICE_ATTR_RO(read_byte_cnt); 4734 4735 /** 4736 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4737 * @dev: struct device 4738 * @attr: attribute structure 4739 * @buf: buffer to return formatted data in 4740 */ 4741 static ssize_t read_ns_show(struct device *dev, 4742 struct device_attribute *attr, char *buf) 4743 { 4744 struct st_modedef *STm = dev_get_drvdata(dev); 4745 4746 return sprintf(buf, "%lld", 4747 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4748 } 4749 static DEVICE_ATTR_RO(read_ns); 4750 4751 /** 4752 * write_cnt_show - write count - number of user calls 4753 * to write(2) that have written data to tape. 4754 * @dev: struct device 4755 * @attr: attribute structure 4756 * @buf: buffer to return formatted data in 4757 */ 4758 static ssize_t write_cnt_show(struct device *dev, 4759 struct device_attribute *attr, char *buf) 4760 { 4761 struct st_modedef *STm = dev_get_drvdata(dev); 4762 4763 return sprintf(buf, "%lld", 4764 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4765 } 4766 static DEVICE_ATTR_RO(write_cnt); 4767 4768 /** 4769 * write_byte_cnt_show - write byte count - raw count of 4770 * bytes written to tape. 4771 * @dev: struct device 4772 * @attr: attribute structure 4773 * @buf: buffer to return formatted data in 4774 */ 4775 static ssize_t write_byte_cnt_show(struct device *dev, 4776 struct device_attribute *attr, char *buf) 4777 { 4778 struct st_modedef *STm = dev_get_drvdata(dev); 4779 4780 return sprintf(buf, "%lld", 4781 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4782 } 4783 static DEVICE_ATTR_RO(write_byte_cnt); 4784 4785 /** 4786 * write_ns_show - write ns - number of nanoseconds waiting on write 4787 * requests to complete. 4788 * @dev: struct device 4789 * @attr: attribute structure 4790 * @buf: buffer to return formatted data in 4791 */ 4792 static ssize_t write_ns_show(struct device *dev, 4793 struct device_attribute *attr, char *buf) 4794 { 4795 struct st_modedef *STm = dev_get_drvdata(dev); 4796 4797 return sprintf(buf, "%lld", 4798 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4799 } 4800 static DEVICE_ATTR_RO(write_ns); 4801 4802 /** 4803 * in_flight_show - number of I/Os currently in flight - 4804 * in most cases this will be either 0 or 1. It may be higher if someone 4805 * has also issued other SCSI commands such as via an ioctl. 4806 * @dev: struct device 4807 * @attr: attribute structure 4808 * @buf: buffer to return formatted data in 4809 */ 4810 static ssize_t in_flight_show(struct device *dev, 4811 struct device_attribute *attr, char *buf) 4812 { 4813 struct st_modedef *STm = dev_get_drvdata(dev); 4814 4815 return sprintf(buf, "%lld", 4816 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4817 } 4818 static DEVICE_ATTR_RO(in_flight); 4819 4820 /** 4821 * io_ns_show - io wait ns - this is the number of ns spent 4822 * waiting on all I/O to complete. This includes tape movement commands 4823 * such as rewinding, seeking to end of file or tape, it also includes 4824 * read and write. To determine the time spent on tape movement 4825 * subtract the read and write ns from this value. 4826 * @dev: struct device 4827 * @attr: attribute structure 4828 * @buf: buffer to return formatted data in 4829 */ 4830 static ssize_t io_ns_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->tot_io_time)); 4837 } 4838 static DEVICE_ATTR_RO(io_ns); 4839 4840 /** 4841 * other_cnt_show - other io count - this is the number of 4842 * I/O requests other than read and write requests. 4843 * Typically these are tape movement requests but will include driver 4844 * tape movement. This includes only requests issued by the st driver. 4845 * @dev: struct device 4846 * @attr: attribute structure 4847 * @buf: buffer to return formatted data in 4848 */ 4849 static ssize_t other_cnt_show(struct device *dev, 4850 struct device_attribute *attr, char *buf) 4851 { 4852 struct st_modedef *STm = dev_get_drvdata(dev); 4853 4854 return sprintf(buf, "%lld", 4855 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4856 } 4857 static DEVICE_ATTR_RO(other_cnt); 4858 4859 /** 4860 * resid_cnt_show - A count of the number of times we get a residual 4861 * count - this should indicate someone issuing reads larger than the 4862 * block size on tape. 4863 * @dev: struct device 4864 * @attr: attribute structure 4865 * @buf: buffer to return formatted data in 4866 */ 4867 static ssize_t resid_cnt_show(struct device *dev, 4868 struct device_attribute *attr, char *buf) 4869 { 4870 struct st_modedef *STm = dev_get_drvdata(dev); 4871 4872 return sprintf(buf, "%lld", 4873 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4874 } 4875 static DEVICE_ATTR_RO(resid_cnt); 4876 4877 static struct attribute *st_dev_attrs[] = { 4878 &dev_attr_defined.attr, 4879 &dev_attr_default_blksize.attr, 4880 &dev_attr_default_density.attr, 4881 &dev_attr_default_compression.attr, 4882 &dev_attr_options.attr, 4883 NULL, 4884 }; 4885 4886 static struct attribute *st_stats_attrs[] = { 4887 &dev_attr_read_cnt.attr, 4888 &dev_attr_read_byte_cnt.attr, 4889 &dev_attr_read_ns.attr, 4890 &dev_attr_write_cnt.attr, 4891 &dev_attr_write_byte_cnt.attr, 4892 &dev_attr_write_ns.attr, 4893 &dev_attr_in_flight.attr, 4894 &dev_attr_io_ns.attr, 4895 &dev_attr_other_cnt.attr, 4896 &dev_attr_resid_cnt.attr, 4897 NULL, 4898 }; 4899 4900 static struct attribute_group stats_group = { 4901 .name = "stats", 4902 .attrs = st_stats_attrs, 4903 }; 4904 4905 static struct attribute_group st_group = { 4906 .attrs = st_dev_attrs, 4907 }; 4908 4909 static const struct attribute_group *st_dev_groups[] = { 4910 &st_group, 4911 &stats_group, 4912 NULL, 4913 }; 4914 4915 /* The following functions may be useful for a larger audience. */ 4916 static int sgl_map_user_pages(struct st_buffer *STbp, 4917 const unsigned int max_pages, unsigned long uaddr, 4918 size_t count, int rw) 4919 { 4920 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4921 unsigned long start = uaddr >> PAGE_SHIFT; 4922 const int nr_pages = end - start; 4923 int res, i; 4924 struct page **pages; 4925 struct rq_map_data *mdata = &STbp->map_data; 4926 4927 /* User attempted Overflow! */ 4928 if ((uaddr + count) < uaddr) 4929 return -EINVAL; 4930 4931 /* Too big */ 4932 if (nr_pages > max_pages) 4933 return -ENOMEM; 4934 4935 /* Hmm? */ 4936 if (count == 0) 4937 return 0; 4938 4939 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4940 if (pages == NULL) 4941 return -ENOMEM; 4942 4943 /* Try to fault in all of the necessary pages */ 4944 /* rw==READ means read from drive, write into memory area */ 4945 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0, 4946 pages); 4947 4948 /* Errors and no page mapped should return here */ 4949 if (res < nr_pages) 4950 goto out_unmap; 4951 4952 for (i=0; i < nr_pages; i++) { 4953 /* FIXME: flush superflous for rw==READ, 4954 * probably wrong function for rw==WRITE 4955 */ 4956 flush_dcache_page(pages[i]); 4957 } 4958 4959 mdata->offset = uaddr & ~PAGE_MASK; 4960 STbp->mapped_pages = pages; 4961 4962 return nr_pages; 4963 out_unmap: 4964 if (res > 0) { 4965 unpin_user_pages(pages, res); 4966 res = 0; 4967 } 4968 kfree(pages); 4969 return res; 4970 } 4971 4972 4973 /* And unmap them... */ 4974 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4975 const unsigned int nr_pages, int dirtied) 4976 { 4977 /* FIXME: cache flush missing for rw==READ */ 4978 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied); 4979 4980 kfree(STbp->mapped_pages); 4981 STbp->mapped_pages = NULL; 4982 4983 return 0; 4984 } 4985