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(req->q, 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 break; 2850 case MTRETEN: 2851 cmd[0] = START_STOP; 2852 if (STp->immediate) { 2853 cmd[1] = 1; /* Don't wait for completion */ 2854 timeout = STp->device->request_queue->rq_timeout; 2855 } 2856 cmd[4] = 3; 2857 DEBC_printk(STp, "Retensioning tape.\n"); 2858 fileno = blkno = at_sm = 0; 2859 break; 2860 case MTEOM: 2861 if (!STp->fast_mteom) { 2862 /* space to the end of tape */ 2863 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2864 fileno = STps->drv_file; 2865 if (STps->eof >= ST_EOD_1) 2866 return 0; 2867 /* The next lines would hide the number of spaced FileMarks 2868 That's why I inserted the previous lines. I had no luck 2869 with detecting EOM with FSF, so we go now to EOM. 2870 Joerg Weule */ 2871 } else 2872 fileno = (-1); 2873 cmd[0] = SPACE; 2874 cmd[1] = 3; 2875 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2876 blkno = -1; 2877 at_sm = 0; 2878 break; 2879 case MTERASE: 2880 if (STp->write_prot) 2881 return (-EACCES); 2882 cmd[0] = ERASE; 2883 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2884 if (STp->immediate) { 2885 cmd[1] |= 2; /* Don't wait for completion */ 2886 timeout = STp->device->request_queue->rq_timeout; 2887 } 2888 else 2889 timeout = STp->long_timeout * 8; 2890 2891 DEBC_printk(STp, "Erasing tape.\n"); 2892 fileno = blkno = at_sm = 0; 2893 break; 2894 case MTSETBLK: /* Set block length */ 2895 case MTSETDENSITY: /* Set tape density */ 2896 case MTSETDRVBUFFER: /* Set drive buffering */ 2897 case SET_DENS_AND_BLK: /* Set density and block size */ 2898 chg_eof = 0; 2899 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2900 return (-EIO); /* Not allowed if data in buffer */ 2901 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2902 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2903 STp->max_block > 0 && 2904 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2905 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2906 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2907 return (-EINVAL); 2908 } 2909 cmd[0] = MODE_SELECT; 2910 if ((STp->use_pf & USE_PF)) 2911 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2912 cmd[4] = datalen = 12; 2913 direction = DMA_TO_DEVICE; 2914 2915 memset((STp->buffer)->b_data, 0, 12); 2916 if (cmd_in == MTSETDRVBUFFER) 2917 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2918 else 2919 (STp->buffer)->b_data[2] = 2920 STp->drv_buffer << 4; 2921 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2922 if (cmd_in == MTSETDENSITY) { 2923 (STp->buffer)->b_data[4] = arg; 2924 STp->density_changed = 1; /* At least we tried ;-) */ 2925 } else if (cmd_in == SET_DENS_AND_BLK) 2926 (STp->buffer)->b_data[4] = arg >> 24; 2927 else 2928 (STp->buffer)->b_data[4] = STp->density; 2929 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2930 ltmp = arg & MT_ST_BLKSIZE_MASK; 2931 if (cmd_in == MTSETBLK) 2932 STp->blksize_changed = 1; /* At least we tried ;-) */ 2933 } else 2934 ltmp = STp->block_size; 2935 (STp->buffer)->b_data[9] = (ltmp >> 16); 2936 (STp->buffer)->b_data[10] = (ltmp >> 8); 2937 (STp->buffer)->b_data[11] = ltmp; 2938 timeout = STp->device->request_queue->rq_timeout; 2939 DEBC( 2940 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2941 st_printk(ST_DEB_MSG, STp, 2942 "Setting block size to %d bytes.\n", 2943 (STp->buffer)->b_data[9] * 65536 + 2944 (STp->buffer)->b_data[10] * 256 + 2945 (STp->buffer)->b_data[11]); 2946 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2947 st_printk(ST_DEB_MSG, STp, 2948 "Setting density code to %x.\n", 2949 (STp->buffer)->b_data[4]); 2950 if (cmd_in == MTSETDRVBUFFER) 2951 st_printk(ST_DEB_MSG, STp, 2952 "Setting drive buffer code to %d.\n", 2953 ((STp->buffer)->b_data[2] >> 4) & 7); 2954 ) 2955 break; 2956 default: 2957 return (-ENOSYS); 2958 } 2959 2960 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2961 timeout, MAX_RETRIES, 1); 2962 if (!SRpnt) 2963 return (STp->buffer)->syscall_result; 2964 2965 ioctl_result = (STp->buffer)->syscall_result; 2966 2967 if (!ioctl_result) { /* SCSI command successful */ 2968 st_release_request(SRpnt); 2969 SRpnt = NULL; 2970 STps->drv_block = blkno; 2971 STps->drv_file = fileno; 2972 STps->at_sm = at_sm; 2973 2974 if (cmd_in == MTBSFM) 2975 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2976 else if (cmd_in == MTFSFM) 2977 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2978 2979 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2980 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2981 if (STp->block_size != 0) { 2982 (STp->buffer)->buffer_blocks = 2983 (STp->buffer)->buffer_size / STp->block_size; 2984 } 2985 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2986 if (cmd_in == SET_DENS_AND_BLK) 2987 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2988 } else if (cmd_in == MTSETDRVBUFFER) 2989 STp->drv_buffer = (arg & 7); 2990 else if (cmd_in == MTSETDENSITY) 2991 STp->density = arg; 2992 2993 if (cmd_in == MTEOM) 2994 STps->eof = ST_EOD; 2995 else if (cmd_in == MTFSF) 2996 STps->eof = ST_FM; 2997 else if (chg_eof) 2998 STps->eof = ST_NOEOF; 2999 3000 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3001 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3002 } else { /* SCSI command was not completely successful. Don't return 3003 from this block without releasing the SCSI command block! */ 3004 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3005 3006 if (cmdstatp->flags & SENSE_EOM) { 3007 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3008 cmd_in != MTBSR && cmd_in != MTBSS) 3009 STps->eof = ST_EOM_OK; 3010 STps->drv_block = 0; 3011 } 3012 3013 if (cmdstatp->remainder_valid) 3014 undone = (int)cmdstatp->uremainder64; 3015 else 3016 undone = 0; 3017 3018 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3019 cmdstatp->have_sense && 3020 (cmdstatp->flags & SENSE_EOM)) { 3021 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3022 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3023 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3024 STps->eof = ST_NOEOF; 3025 } else { /* Writing EOF(s) failed */ 3026 if (fileno >= 0) 3027 fileno -= undone; 3028 if (undone < arg) 3029 STps->eof = ST_NOEOF; 3030 } 3031 STps->drv_file = fileno; 3032 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3033 if (fileno >= 0) 3034 STps->drv_file = fileno - undone; 3035 else 3036 STps->drv_file = fileno; 3037 STps->drv_block = -1; 3038 STps->eof = ST_NOEOF; 3039 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3040 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3041 undone = (-undone); 3042 if (STps->drv_file >= 0) 3043 STps->drv_file = fileno + undone; 3044 STps->drv_block = 0; 3045 STps->eof = ST_NOEOF; 3046 } else if (cmd_in == MTFSR) { 3047 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3048 if (STps->drv_file >= 0) 3049 STps->drv_file++; 3050 STps->drv_block = 0; 3051 STps->eof = ST_FM; 3052 } else { 3053 if (blkno >= undone) 3054 STps->drv_block = blkno - undone; 3055 else 3056 STps->drv_block = (-1); 3057 STps->eof = ST_NOEOF; 3058 } 3059 } else if (cmd_in == MTBSR) { 3060 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3061 STps->drv_file--; 3062 STps->drv_block = (-1); 3063 } else { 3064 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3065 undone = (-undone); 3066 if (STps->drv_block >= 0) 3067 STps->drv_block = blkno + undone; 3068 } 3069 STps->eof = ST_NOEOF; 3070 } else if (cmd_in == MTEOM) { 3071 STps->drv_file = (-1); 3072 STps->drv_block = (-1); 3073 STps->eof = ST_EOD; 3074 } else if (cmd_in == MTSETBLK || 3075 cmd_in == MTSETDENSITY || 3076 cmd_in == MTSETDRVBUFFER || 3077 cmd_in == SET_DENS_AND_BLK) { 3078 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3079 !(STp->use_pf & PF_TESTED)) { 3080 /* Try the other possible state of Page Format if not 3081 already tried */ 3082 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3083 st_release_request(SRpnt); 3084 SRpnt = NULL; 3085 return st_int_ioctl(STp, cmd_in, arg); 3086 } 3087 } else if (chg_eof) 3088 STps->eof = ST_NOEOF; 3089 3090 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3091 STps->eof = ST_EOD; 3092 3093 st_release_request(SRpnt); 3094 SRpnt = NULL; 3095 } 3096 3097 return ioctl_result; 3098 } 3099 3100 3101 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3102 structure. */ 3103 3104 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3105 int logical) 3106 { 3107 int result; 3108 unsigned char scmd[MAX_COMMAND_SIZE]; 3109 struct st_request *SRpnt; 3110 3111 if (STp->ready != ST_READY) 3112 return (-EIO); 3113 3114 memset(scmd, 0, MAX_COMMAND_SIZE); 3115 if ((STp->device)->scsi_level < SCSI_2) { 3116 scmd[0] = QFA_REQUEST_BLOCK; 3117 scmd[4] = 3; 3118 } else { 3119 scmd[0] = READ_POSITION; 3120 if (!logical && !STp->scsi2_logical) 3121 scmd[1] = 1; 3122 } 3123 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3124 STp->device->request_queue->rq_timeout, 3125 MAX_READY_RETRIES, 1); 3126 if (!SRpnt) 3127 return (STp->buffer)->syscall_result; 3128 3129 if ((STp->buffer)->syscall_result != 0 || 3130 (STp->device->scsi_level >= SCSI_2 && 3131 ((STp->buffer)->b_data[0] & 4) != 0)) { 3132 *block = *partition = 0; 3133 DEBC_printk(STp, " Can't read tape position.\n"); 3134 result = (-EIO); 3135 } else { 3136 result = 0; 3137 if ((STp->device)->scsi_level < SCSI_2) { 3138 *block = ((STp->buffer)->b_data[0] << 16) 3139 + ((STp->buffer)->b_data[1] << 8) 3140 + (STp->buffer)->b_data[2]; 3141 *partition = 0; 3142 } else { 3143 *block = ((STp->buffer)->b_data[4] << 24) 3144 + ((STp->buffer)->b_data[5] << 16) 3145 + ((STp->buffer)->b_data[6] << 8) 3146 + (STp->buffer)->b_data[7]; 3147 *partition = (STp->buffer)->b_data[1]; 3148 if (((STp->buffer)->b_data[0] & 0x80) && 3149 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3150 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3151 } 3152 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3153 *block, *partition); 3154 } 3155 st_release_request(SRpnt); 3156 SRpnt = NULL; 3157 3158 return result; 3159 } 3160 3161 3162 /* Set the tape block and partition. Negative partition means that only the 3163 block should be set in vendor specific way. */ 3164 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3165 int logical) 3166 { 3167 struct st_partstat *STps; 3168 int result, p; 3169 unsigned int blk; 3170 int timeout; 3171 unsigned char scmd[MAX_COMMAND_SIZE]; 3172 struct st_request *SRpnt; 3173 3174 if (STp->ready != ST_READY) 3175 return (-EIO); 3176 timeout = STp->long_timeout; 3177 STps = &(STp->ps[STp->partition]); 3178 3179 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3180 block, partition); 3181 DEB(if (partition < 0) 3182 return (-EIO); ) 3183 3184 /* Update the location at the partition we are leaving */ 3185 if ((!STp->can_partitions && partition != 0) || 3186 partition >= ST_NBR_PARTITIONS) 3187 return (-EINVAL); 3188 if (partition != STp->partition) { 3189 if (get_location(STp, &blk, &p, 1)) 3190 STps->last_block_valid = 0; 3191 else { 3192 STps->last_block_valid = 1; 3193 STps->last_block_visited = blk; 3194 DEBC_printk(STp, "Visited block %d for " 3195 "partition %d saved.\n", 3196 blk, STp->partition); 3197 } 3198 } 3199 3200 memset(scmd, 0, MAX_COMMAND_SIZE); 3201 if ((STp->device)->scsi_level < SCSI_2) { 3202 scmd[0] = QFA_SEEK_BLOCK; 3203 scmd[2] = (block >> 16); 3204 scmd[3] = (block >> 8); 3205 scmd[4] = block; 3206 scmd[5] = 0; 3207 } else { 3208 scmd[0] = SEEK_10; 3209 scmd[3] = (block >> 24); 3210 scmd[4] = (block >> 16); 3211 scmd[5] = (block >> 8); 3212 scmd[6] = block; 3213 if (!logical && !STp->scsi2_logical) 3214 scmd[1] = 4; 3215 if (STp->partition != partition) { 3216 scmd[1] |= 2; 3217 scmd[8] = partition; 3218 DEBC_printk(STp, "Trying to change partition " 3219 "from %d to %d\n", STp->partition, 3220 partition); 3221 } 3222 } 3223 if (STp->immediate) { 3224 scmd[1] |= 1; /* Don't wait for completion */ 3225 timeout = STp->device->request_queue->rq_timeout; 3226 } 3227 3228 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3229 timeout, MAX_READY_RETRIES, 1); 3230 if (!SRpnt) 3231 return (STp->buffer)->syscall_result; 3232 3233 STps->drv_block = STps->drv_file = (-1); 3234 STps->eof = ST_NOEOF; 3235 if ((STp->buffer)->syscall_result != 0) { 3236 result = (-EIO); 3237 if (STp->can_partitions && 3238 (STp->device)->scsi_level >= SCSI_2 && 3239 (p = find_partition(STp)) >= 0) 3240 STp->partition = p; 3241 } else { 3242 if (STp->can_partitions) { 3243 STp->partition = partition; 3244 STps = &(STp->ps[partition]); 3245 if (!STps->last_block_valid || 3246 STps->last_block_visited != block) { 3247 STps->at_sm = 0; 3248 STps->rw = ST_IDLE; 3249 } 3250 } else 3251 STps->at_sm = 0; 3252 if (block == 0) 3253 STps->drv_block = STps->drv_file = 0; 3254 result = 0; 3255 } 3256 3257 st_release_request(SRpnt); 3258 SRpnt = NULL; 3259 3260 return result; 3261 } 3262 3263 3264 /* Find the current partition number for the drive status. Called from open and 3265 returns either partition number of negative error code. */ 3266 static int find_partition(struct scsi_tape *STp) 3267 { 3268 int i, partition; 3269 unsigned int block; 3270 3271 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3272 return i; 3273 if (partition >= ST_NBR_PARTITIONS) 3274 return (-EIO); 3275 return partition; 3276 } 3277 3278 3279 /* Change the partition if necessary */ 3280 static int switch_partition(struct scsi_tape *STp) 3281 { 3282 struct st_partstat *STps; 3283 3284 if (STp->partition == STp->new_partition) 3285 return 0; 3286 STps = &(STp->ps[STp->new_partition]); 3287 if (!STps->last_block_valid) 3288 STps->last_block_visited = 0; 3289 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3290 } 3291 3292 /* Functions for reading and writing the medium partition mode page. */ 3293 3294 #define PART_PAGE 0x11 3295 #define PART_PAGE_FIXED_LENGTH 8 3296 3297 #define PP_OFF_MAX_ADD_PARTS 2 3298 #define PP_OFF_NBR_ADD_PARTS 3 3299 #define PP_OFF_FLAGS 4 3300 #define PP_OFF_PART_UNITS 6 3301 #define PP_OFF_RESERVED 7 3302 3303 #define PP_BIT_IDP 0x20 3304 #define PP_BIT_FDP 0x80 3305 #define PP_MSK_PSUM_MB 0x10 3306 #define PP_MSK_PSUM_UNITS 0x18 3307 #define PP_MSK_POFM 0x04 3308 3309 /* Get the number of partitions on the tape. As a side effect reads the 3310 mode page into the tape buffer. */ 3311 static int nbr_partitions(struct scsi_tape *STp) 3312 { 3313 int result; 3314 3315 if (STp->ready != ST_READY) 3316 return (-EIO); 3317 3318 result = read_mode_page(STp, PART_PAGE, 1); 3319 3320 if (result) { 3321 DEBC_printk(STp, "Can't read medium partition page.\n"); 3322 result = (-EIO); 3323 } else { 3324 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3325 PP_OFF_NBR_ADD_PARTS] + 1; 3326 DEBC_printk(STp, "Number of partitions %d.\n", result); 3327 } 3328 3329 return result; 3330 } 3331 3332 3333 static int format_medium(struct scsi_tape *STp, int format) 3334 { 3335 int result = 0; 3336 int timeout = STp->long_timeout; 3337 unsigned char scmd[MAX_COMMAND_SIZE]; 3338 struct st_request *SRpnt; 3339 3340 memset(scmd, 0, MAX_COMMAND_SIZE); 3341 scmd[0] = FORMAT_UNIT; 3342 scmd[2] = format; 3343 if (STp->immediate) { 3344 scmd[1] |= 1; /* Don't wait for completion */ 3345 timeout = STp->device->request_queue->rq_timeout; 3346 } 3347 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3348 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3349 timeout, MAX_RETRIES, 1); 3350 if (!SRpnt) 3351 result = STp->buffer->syscall_result; 3352 return result; 3353 } 3354 3355 3356 /* Partition the tape into two partitions if size > 0 or one partition if 3357 size == 0. 3358 3359 The block descriptors are read and written because Sony SDT-7000 does not 3360 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3361 3362 My HP C1533A drive returns only one partition size field. This is used to 3363 set the size of partition 1. There is no size field for the default partition. 3364 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3365 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3366 The following algorithm is used to accommodate both drives: if the number of 3367 partition size fields is greater than the maximum number of additional partitions 3368 in the mode page, the second field is used. Otherwise the first field is used. 3369 3370 For Seagate DDS drives the page length must be 8 when no partitions is defined 3371 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3372 is acceptable also to some other old drives and enforced if the first partition 3373 size field is used for the first additional partition size. 3374 3375 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3376 */ 3377 static int partition_tape(struct scsi_tape *STp, int size) 3378 { 3379 int result; 3380 int target_partition; 3381 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3382 int pgo, psd_cnt, psdo; 3383 int psum = PP_MSK_PSUM_MB, units = 0; 3384 unsigned char *bp; 3385 3386 result = read_mode_page(STp, PART_PAGE, 0); 3387 if (result) { 3388 DEBC_printk(STp, "Can't read partition mode page.\n"); 3389 return result; 3390 } 3391 target_partition = 1; 3392 if (size < 0) { 3393 target_partition = 0; 3394 size = -size; 3395 } 3396 3397 /* The mode page is in the buffer. Let's modify it and write it. */ 3398 bp = (STp->buffer)->b_data; 3399 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3400 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3401 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3402 3403 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3404 3405 if (scsi3) { 3406 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3407 if (needs_format && size == 0) { 3408 /* No need to write the mode page when clearing 3409 * partitioning 3410 */ 3411 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3412 result = format_medium(STp, 0); 3413 goto out; 3414 } 3415 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3416 psd_cnt = 2; 3417 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3418 /* Use units scaling for large partitions if the device 3419 * suggests it and no precision lost. Required for IBM 3420 * TS1140/50 drives that don't support MB units. 3421 */ 3422 if (size >= 1000 && (size % 1000) == 0) { 3423 size /= 1000; 3424 psum = PP_MSK_PSUM_UNITS; 3425 units = 9; /* GB */ 3426 } 3427 } 3428 /* Try it anyway if too large to specify in MB */ 3429 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3430 size /= 1000; 3431 psum = PP_MSK_PSUM_UNITS; 3432 units = 9; /* GB */ 3433 } 3434 } 3435 3436 if (size >= 65535 || /* Does not fit into two bytes */ 3437 (target_partition == 0 && psd_cnt < 2)) { 3438 result = -EINVAL; 3439 goto out; 3440 } 3441 3442 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3443 /* The second condition is for HP DDS which use only one partition size 3444 * descriptor 3445 */ 3446 if (target_partition > 0 && 3447 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3448 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3449 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3450 psdo += 2; 3451 } 3452 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3453 3454 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3455 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3456 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3457 3458 if (size == 0) { 3459 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3460 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3461 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3462 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3463 } else { 3464 bp[psdo] = (size >> 8) & 0xff; 3465 bp[psdo + 1] = size & 0xff; 3466 if (target_partition == 0) 3467 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3468 bp[pgo + 3] = 1; 3469 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3470 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3471 DEBC_printk(STp, 3472 "Formatting tape with two partitions (%i = %d MB).\n", 3473 target_partition, units > 0 ? size * 1000 : size); 3474 } 3475 bp[pgo + PP_OFF_PART_UNITS] = 0; 3476 bp[pgo + PP_OFF_RESERVED] = 0; 3477 if (size != 1 || units != 0) { 3478 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3479 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3480 bp[pgo + PP_OFF_PART_UNITS] = units; 3481 } else 3482 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3483 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3484 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3485 3486 result = write_mode_page(STp, PART_PAGE, 1); 3487 3488 if (!result && needs_format) 3489 result = format_medium(STp, 1); 3490 3491 if (result) { 3492 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3493 result = (-EIO); 3494 } 3495 3496 out: 3497 return result; 3498 } 3499 3500 3501 3502 /* The ioctl command */ 3503 static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p) 3504 { 3505 int i, cmd_nr, cmd_type, bt; 3506 int retval = 0; 3507 unsigned int blk; 3508 struct scsi_tape *STp = file->private_data; 3509 struct st_modedef *STm; 3510 struct st_partstat *STps; 3511 3512 if (mutex_lock_interruptible(&STp->lock)) 3513 return -ERESTARTSYS; 3514 3515 DEB( 3516 if (debugging && !STp->in_use) { 3517 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3518 retval = (-EIO); 3519 goto out; 3520 } ) /* end DEB */ 3521 3522 STm = &(STp->modes[STp->current_mode]); 3523 STps = &(STp->ps[STp->partition]); 3524 3525 /* 3526 * If we are in the middle of error recovery, don't let anyone 3527 * else try and use this device. Also, if error recovery fails, it 3528 * may try and take the device offline, in which case all further 3529 * access to the device is prohibited. 3530 */ 3531 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3532 file->f_flags & O_NDELAY); 3533 if (retval) 3534 goto out; 3535 3536 cmd_type = _IOC_TYPE(cmd_in); 3537 cmd_nr = _IOC_NR(cmd_in); 3538 3539 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3540 struct mtop mtc; 3541 3542 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3543 retval = (-EINVAL); 3544 goto out; 3545 } 3546 3547 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3548 if (i) { 3549 retval = (-EFAULT); 3550 goto out; 3551 } 3552 3553 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3554 st_printk(KERN_WARNING, STp, 3555 "MTSETDRVBUFFER only allowed for root.\n"); 3556 retval = (-EPERM); 3557 goto out; 3558 } 3559 if (!STm->defined && 3560 (mtc.mt_op != MTSETDRVBUFFER && 3561 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3562 retval = (-ENXIO); 3563 goto out; 3564 } 3565 3566 if (!STp->pos_unknown) { 3567 3568 if (STps->eof == ST_FM_HIT) { 3569 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3570 mtc.mt_op == MTEOM) { 3571 mtc.mt_count -= 1; 3572 if (STps->drv_file >= 0) 3573 STps->drv_file += 1; 3574 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3575 mtc.mt_count += 1; 3576 if (STps->drv_file >= 0) 3577 STps->drv_file += 1; 3578 } 3579 } 3580 3581 if (mtc.mt_op == MTSEEK) { 3582 /* Old position must be restored if partition will be 3583 changed */ 3584 i = !STp->can_partitions || 3585 (STp->new_partition != STp->partition); 3586 } else { 3587 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3588 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3589 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3590 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3591 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3592 mtc.mt_op == MTCOMPRESSION; 3593 } 3594 i = flush_buffer(STp, i); 3595 if (i < 0) { 3596 retval = i; 3597 goto out; 3598 } 3599 if (STps->rw == ST_WRITING && 3600 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3601 mtc.mt_op == MTSEEK || 3602 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3603 i = st_int_ioctl(STp, MTWEOF, 1); 3604 if (i < 0) { 3605 retval = i; 3606 goto out; 3607 } 3608 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3609 mtc.mt_count++; 3610 STps->rw = ST_IDLE; 3611 } 3612 3613 } else { 3614 /* 3615 * If there was a bus reset, block further access 3616 * to this device. If the user wants to rewind the tape, 3617 * then reset the flag and allow access again. 3618 */ 3619 if (mtc.mt_op != MTREW && 3620 mtc.mt_op != MTOFFL && 3621 mtc.mt_op != MTRETEN && 3622 mtc.mt_op != MTERASE && 3623 mtc.mt_op != MTSEEK && 3624 mtc.mt_op != MTEOM) { 3625 retval = (-EIO); 3626 goto out; 3627 } 3628 reset_state(STp); 3629 /* remove this when the midlevel properly clears was_reset */ 3630 STp->device->was_reset = 0; 3631 } 3632 3633 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3634 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3635 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3636 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3637 3638 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3639 do_door_lock(STp, 0); /* Ignore result! */ 3640 3641 if (mtc.mt_op == MTSETDRVBUFFER && 3642 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3643 retval = st_set_options(STp, mtc.mt_count); 3644 goto out; 3645 } 3646 3647 if (mtc.mt_op == MTSETPART) { 3648 if (!STp->can_partitions || 3649 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3650 retval = (-EINVAL); 3651 goto out; 3652 } 3653 if (mtc.mt_count >= STp->nbr_partitions && 3654 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3655 retval = (-EIO); 3656 goto out; 3657 } 3658 if (mtc.mt_count >= STp->nbr_partitions) { 3659 retval = (-EINVAL); 3660 goto out; 3661 } 3662 STp->new_partition = mtc.mt_count; 3663 retval = 0; 3664 goto out; 3665 } 3666 3667 if (mtc.mt_op == MTMKPART) { 3668 if (!STp->can_partitions) { 3669 retval = (-EINVAL); 3670 goto out; 3671 } 3672 i = do_load_unload(STp, file, 1); 3673 if (i < 0) { 3674 retval = i; 3675 goto out; 3676 } 3677 i = partition_tape(STp, mtc.mt_count); 3678 if (i < 0) { 3679 retval = i; 3680 goto out; 3681 } 3682 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3683 STp->ps[i].rw = ST_IDLE; 3684 STp->ps[i].at_sm = 0; 3685 STp->ps[i].last_block_valid = 0; 3686 } 3687 STp->partition = STp->new_partition = 0; 3688 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3689 STps->drv_block = STps->drv_file = 0; 3690 retval = 0; 3691 goto out; 3692 } 3693 3694 if (mtc.mt_op == MTSEEK) { 3695 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3696 if (!STp->can_partitions) 3697 STp->ps[0].rw = ST_IDLE; 3698 retval = i; 3699 goto out; 3700 } 3701 3702 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3703 retval = do_load_unload(STp, file, 0); 3704 goto out; 3705 } 3706 3707 if (mtc.mt_op == MTLOAD) { 3708 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3709 goto out; 3710 } 3711 3712 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3713 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3714 goto out; 3715 } 3716 3717 if (STp->can_partitions && STp->ready == ST_READY && 3718 (i = switch_partition(STp)) < 0) { 3719 retval = i; 3720 goto out; 3721 } 3722 3723 if (mtc.mt_op == MTCOMPRESSION) 3724 retval = st_compression(STp, (mtc.mt_count & 1)); 3725 else 3726 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3727 goto out; 3728 } 3729 if (!STm->defined) { 3730 retval = (-ENXIO); 3731 goto out; 3732 } 3733 3734 if ((i = flush_buffer(STp, 0)) < 0) { 3735 retval = i; 3736 goto out; 3737 } 3738 if (STp->can_partitions && 3739 (i = switch_partition(STp)) < 0) { 3740 retval = i; 3741 goto out; 3742 } 3743 3744 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3745 struct mtget mt_status; 3746 3747 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3748 retval = (-EINVAL); 3749 goto out; 3750 } 3751 3752 mt_status.mt_type = STp->tape_type; 3753 mt_status.mt_dsreg = 3754 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3755 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3756 mt_status.mt_blkno = STps->drv_block; 3757 mt_status.mt_fileno = STps->drv_file; 3758 if (STp->block_size != 0) { 3759 if (STps->rw == ST_WRITING) 3760 mt_status.mt_blkno += 3761 (STp->buffer)->buffer_bytes / STp->block_size; 3762 else if (STps->rw == ST_READING) 3763 mt_status.mt_blkno -= 3764 ((STp->buffer)->buffer_bytes + 3765 STp->block_size - 1) / STp->block_size; 3766 } 3767 3768 mt_status.mt_gstat = 0; 3769 if (STp->drv_write_prot) 3770 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3771 if (mt_status.mt_blkno == 0) { 3772 if (mt_status.mt_fileno == 0) 3773 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3774 else 3775 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3776 } 3777 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3778 mt_status.mt_resid = STp->partition; 3779 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3780 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3781 else if (STps->eof >= ST_EOM_OK) 3782 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3783 if (STp->density == 1) 3784 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3785 else if (STp->density == 2) 3786 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3787 else if (STp->density == 3) 3788 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3789 if (STp->ready == ST_READY) 3790 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3791 if (STp->ready == ST_NO_TAPE) 3792 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3793 if (STps->at_sm) 3794 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3795 if (STm->do_async_writes || 3796 (STm->do_buffer_writes && STp->block_size != 0) || 3797 STp->drv_buffer != 0) 3798 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3799 if (STp->cleaning_req) 3800 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3801 3802 retval = put_user_mtget(p, &mt_status); 3803 if (retval) 3804 goto out; 3805 3806 STp->recover_reg = 0; /* Clear after read */ 3807 goto out; 3808 } /* End of MTIOCGET */ 3809 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3810 struct mtpos mt_pos; 3811 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3812 retval = (-EINVAL); 3813 goto out; 3814 } 3815 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3816 retval = i; 3817 goto out; 3818 } 3819 mt_pos.mt_blkno = blk; 3820 retval = put_user_mtpos(p, &mt_pos); 3821 goto out; 3822 } 3823 mutex_unlock(&STp->lock); 3824 switch (cmd_in) { 3825 case SCSI_IOCTL_STOP_UNIT: 3826 /* unload */ 3827 retval = scsi_ioctl(STp->device, cmd_in, p); 3828 if (!retval) { 3829 STp->rew_at_close = 0; 3830 STp->ready = ST_NO_TAPE; 3831 } 3832 return retval; 3833 3834 case SCSI_IOCTL_GET_IDLUN: 3835 case SCSI_IOCTL_GET_BUS_NUMBER: 3836 break; 3837 3838 default: 3839 if ((cmd_in == SG_IO || 3840 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3841 cmd_in == CDROM_SEND_PACKET) && 3842 !capable(CAP_SYS_RAWIO)) 3843 i = -EPERM; 3844 else 3845 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3846 file->f_mode, cmd_in, p); 3847 if (i != -ENOTTY) 3848 return i; 3849 break; 3850 } 3851 return -ENOTTY; 3852 3853 out: 3854 mutex_unlock(&STp->lock); 3855 return retval; 3856 } 3857 3858 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3859 { 3860 void __user *p = (void __user *)arg; 3861 struct scsi_tape *STp = file->private_data; 3862 int ret; 3863 3864 ret = st_ioctl_common(file, cmd_in, p); 3865 if (ret != -ENOTTY) 3866 return ret; 3867 3868 return scsi_ioctl(STp->device, cmd_in, p); 3869 } 3870 3871 #ifdef CONFIG_COMPAT 3872 static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3873 { 3874 void __user *p = compat_ptr(arg); 3875 struct scsi_tape *STp = file->private_data; 3876 int ret; 3877 3878 /* argument conversion is handled using put_user_mtpos/put_user_mtget */ 3879 switch (cmd_in) { 3880 case MTIOCPOS32: 3881 return st_ioctl_common(file, MTIOCPOS, p); 3882 case MTIOCGET32: 3883 return st_ioctl_common(file, MTIOCGET, p); 3884 } 3885 3886 ret = st_ioctl_common(file, cmd_in, p); 3887 if (ret != -ENOTTY) 3888 return ret; 3889 3890 return scsi_compat_ioctl(STp->device, cmd_in, p); 3891 } 3892 #endif 3893 3894 3895 3896 /* Try to allocate a new tape buffer. Calling function must not hold 3897 dev_arr_lock. */ 3898 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3899 { 3900 struct st_buffer *tb; 3901 3902 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3903 if (!tb) { 3904 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3905 return NULL; 3906 } 3907 tb->frp_segs = 0; 3908 tb->use_sg = max_sg; 3909 tb->dma = need_dma; 3910 tb->buffer_size = 0; 3911 3912 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3913 GFP_KERNEL); 3914 if (!tb->reserved_pages) { 3915 kfree(tb); 3916 return NULL; 3917 } 3918 3919 return tb; 3920 } 3921 3922 3923 /* Try to allocate enough space in the tape buffer */ 3924 #define ST_MAX_ORDER 6 3925 3926 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3927 { 3928 int segs, max_segs, b_size, order, got; 3929 gfp_t priority; 3930 3931 if (new_size <= STbuffer->buffer_size) 3932 return 1; 3933 3934 if (STbuffer->buffer_size <= PAGE_SIZE) 3935 normalize_buffer(STbuffer); /* Avoid extra segment */ 3936 3937 max_segs = STbuffer->use_sg; 3938 3939 priority = GFP_KERNEL | __GFP_NOWARN; 3940 if (need_dma) 3941 priority |= GFP_DMA; 3942 3943 if (STbuffer->cleared) 3944 priority |= __GFP_ZERO; 3945 3946 if (STbuffer->frp_segs) { 3947 order = STbuffer->reserved_page_order; 3948 b_size = PAGE_SIZE << order; 3949 } else { 3950 for (b_size = PAGE_SIZE, order = 0; 3951 order < ST_MAX_ORDER && 3952 max_segs * (PAGE_SIZE << order) < new_size; 3953 order++, b_size *= 2) 3954 ; /* empty */ 3955 STbuffer->reserved_page_order = order; 3956 } 3957 if (max_segs * (PAGE_SIZE << order) < new_size) { 3958 if (order == ST_MAX_ORDER) 3959 return 0; 3960 normalize_buffer(STbuffer); 3961 return enlarge_buffer(STbuffer, new_size, need_dma); 3962 } 3963 3964 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3965 segs < max_segs && got < new_size;) { 3966 struct page *page; 3967 3968 page = alloc_pages(priority, order); 3969 if (!page) { 3970 DEB(STbuffer->buffer_size = got); 3971 normalize_buffer(STbuffer); 3972 return 0; 3973 } 3974 3975 STbuffer->frp_segs += 1; 3976 got += b_size; 3977 STbuffer->buffer_size = got; 3978 STbuffer->reserved_pages[segs] = page; 3979 segs++; 3980 } 3981 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3982 3983 return 1; 3984 } 3985 3986 3987 /* Make sure that no data from previous user is in the internal buffer */ 3988 static void clear_buffer(struct st_buffer * st_bp) 3989 { 3990 int i; 3991 3992 for (i=0; i < st_bp->frp_segs; i++) 3993 memset(page_address(st_bp->reserved_pages[i]), 0, 3994 PAGE_SIZE << st_bp->reserved_page_order); 3995 st_bp->cleared = 1; 3996 } 3997 3998 3999 /* Release the extra buffer */ 4000 static void normalize_buffer(struct st_buffer * STbuffer) 4001 { 4002 int i, order = STbuffer->reserved_page_order; 4003 4004 for (i = 0; i < STbuffer->frp_segs; i++) { 4005 __free_pages(STbuffer->reserved_pages[i], order); 4006 STbuffer->buffer_size -= (PAGE_SIZE << order); 4007 } 4008 STbuffer->frp_segs = 0; 4009 STbuffer->sg_segs = 0; 4010 STbuffer->reserved_page_order = 0; 4011 STbuffer->map_data.offset = 0; 4012 } 4013 4014 4015 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 4016 negative error code. */ 4017 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 4018 { 4019 int i, cnt, res, offset; 4020 int length = PAGE_SIZE << st_bp->reserved_page_order; 4021 4022 for (i = 0, offset = st_bp->buffer_bytes; 4023 i < st_bp->frp_segs && offset >= length; i++) 4024 offset -= length; 4025 if (i == st_bp->frp_segs) { /* Should never happen */ 4026 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4027 return (-EIO); 4028 } 4029 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4030 struct page *page = st_bp->reserved_pages[i]; 4031 cnt = length - offset < do_count ? length - offset : do_count; 4032 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4033 if (res) 4034 return (-EFAULT); 4035 do_count -= cnt; 4036 st_bp->buffer_bytes += cnt; 4037 ubp += cnt; 4038 offset = 0; 4039 } 4040 if (do_count) /* Should never happen */ 4041 return (-EIO); 4042 4043 return 0; 4044 } 4045 4046 4047 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4048 negative error code. */ 4049 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4050 { 4051 int i, cnt, res, offset; 4052 int length = PAGE_SIZE << st_bp->reserved_page_order; 4053 4054 for (i = 0, offset = st_bp->read_pointer; 4055 i < st_bp->frp_segs && offset >= length; i++) 4056 offset -= length; 4057 if (i == st_bp->frp_segs) { /* Should never happen */ 4058 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4059 return (-EIO); 4060 } 4061 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4062 struct page *page = st_bp->reserved_pages[i]; 4063 cnt = length - offset < do_count ? length - offset : do_count; 4064 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4065 if (res) 4066 return (-EFAULT); 4067 do_count -= cnt; 4068 st_bp->buffer_bytes -= cnt; 4069 st_bp->read_pointer += cnt; 4070 ubp += cnt; 4071 offset = 0; 4072 } 4073 if (do_count) /* Should never happen */ 4074 return (-EIO); 4075 4076 return 0; 4077 } 4078 4079 4080 /* Move data towards start of buffer */ 4081 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4082 { 4083 int src_seg, dst_seg, src_offset = 0, dst_offset; 4084 int count, total; 4085 int length = PAGE_SIZE << st_bp->reserved_page_order; 4086 4087 if (offset == 0) 4088 return; 4089 4090 total=st_bp->buffer_bytes - offset; 4091 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4092 src_offset = offset; 4093 if (src_offset < length) 4094 break; 4095 offset -= length; 4096 } 4097 4098 st_bp->buffer_bytes = st_bp->read_pointer = total; 4099 for (dst_seg=dst_offset=0; total > 0; ) { 4100 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4101 struct page *spage = st_bp->reserved_pages[src_seg]; 4102 4103 count = min(length - dst_offset, length - src_offset); 4104 memmove(page_address(dpage) + dst_offset, 4105 page_address(spage) + src_offset, count); 4106 src_offset += count; 4107 if (src_offset >= length) { 4108 src_seg++; 4109 src_offset = 0; 4110 } 4111 dst_offset += count; 4112 if (dst_offset >= length) { 4113 dst_seg++; 4114 dst_offset = 0; 4115 } 4116 total -= count; 4117 } 4118 } 4119 4120 /* Validate the options from command line or module parameters */ 4121 static void validate_options(void) 4122 { 4123 if (buffer_kbs > 0) 4124 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4125 if (max_sg_segs >= ST_FIRST_SG) 4126 st_max_sg_segs = max_sg_segs; 4127 } 4128 4129 #ifndef MODULE 4130 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4131 */ 4132 static int __init st_setup(char *str) 4133 { 4134 int i, len, ints[5]; 4135 char *stp; 4136 4137 stp = get_options(str, ARRAY_SIZE(ints), ints); 4138 4139 if (ints[0] > 0) { 4140 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4141 if (parms[i].val) 4142 *parms[i].val = ints[i + 1]; 4143 } else { 4144 while (stp != NULL) { 4145 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4146 len = strlen(parms[i].name); 4147 if (!strncmp(stp, parms[i].name, len) && 4148 (*(stp + len) == ':' || *(stp + len) == '=')) { 4149 if (parms[i].val) 4150 *parms[i].val = 4151 simple_strtoul(stp + len + 1, NULL, 0); 4152 else 4153 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4154 parms[i].name); 4155 break; 4156 } 4157 } 4158 if (i >= ARRAY_SIZE(parms)) 4159 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4160 stp); 4161 stp = strchr(stp, ','); 4162 if (stp) 4163 stp++; 4164 } 4165 } 4166 4167 validate_options(); 4168 4169 return 1; 4170 } 4171 4172 __setup("st=", st_setup); 4173 4174 #endif 4175 4176 static const struct file_operations st_fops = 4177 { 4178 .owner = THIS_MODULE, 4179 .read = st_read, 4180 .write = st_write, 4181 .unlocked_ioctl = st_ioctl, 4182 #ifdef CONFIG_COMPAT 4183 .compat_ioctl = st_compat_ioctl, 4184 #endif 4185 .open = st_open, 4186 .flush = st_flush, 4187 .release = st_release, 4188 .llseek = noop_llseek, 4189 }; 4190 4191 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4192 { 4193 int i, error; 4194 dev_t cdev_devno; 4195 struct cdev *cdev; 4196 struct device *dev; 4197 struct st_modedef *STm = &(tape->modes[mode]); 4198 char name[10]; 4199 int dev_num = tape->index; 4200 4201 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4202 4203 cdev = cdev_alloc(); 4204 if (!cdev) { 4205 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4206 error = -ENOMEM; 4207 goto out; 4208 } 4209 cdev->owner = THIS_MODULE; 4210 cdev->ops = &st_fops; 4211 STm->cdevs[rew] = cdev; 4212 4213 error = cdev_add(cdev, cdev_devno, 1); 4214 if (error) { 4215 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4216 rew ? "non" : "auto", mode); 4217 pr_err("st%d: Device not attached.\n", dev_num); 4218 goto out_free; 4219 } 4220 4221 i = mode << (4 - ST_NBR_MODE_BITS); 4222 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4223 tape->disk->disk_name, st_formats[i]); 4224 4225 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4226 cdev_devno, &tape->modes[mode], "%s", name); 4227 if (IS_ERR(dev)) { 4228 pr_err("st%d: device_create failed\n", dev_num); 4229 error = PTR_ERR(dev); 4230 goto out_free; 4231 } 4232 4233 STm->devs[rew] = dev; 4234 4235 return 0; 4236 out_free: 4237 cdev_del(STm->cdevs[rew]); 4238 out: 4239 STm->cdevs[rew] = NULL; 4240 STm->devs[rew] = NULL; 4241 return error; 4242 } 4243 4244 static int create_cdevs(struct scsi_tape *tape) 4245 { 4246 int mode, error; 4247 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4248 error = create_one_cdev(tape, mode, 0); 4249 if (error) 4250 return error; 4251 error = create_one_cdev(tape, mode, 1); 4252 if (error) 4253 return error; 4254 } 4255 4256 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4257 &tape->modes[0].devs[0]->kobj, "tape"); 4258 } 4259 4260 static void remove_cdevs(struct scsi_tape *tape) 4261 { 4262 int mode, rew; 4263 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4264 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4265 struct st_modedef *STm = &(tape->modes[mode]); 4266 for (rew = 0; rew < 2; rew++) { 4267 if (STm->cdevs[rew]) 4268 cdev_del(STm->cdevs[rew]); 4269 if (STm->devs[rew]) 4270 device_unregister(STm->devs[rew]); 4271 } 4272 } 4273 } 4274 4275 static int st_probe(struct device *dev) 4276 { 4277 struct scsi_device *SDp = to_scsi_device(dev); 4278 struct gendisk *disk = NULL; 4279 struct scsi_tape *tpnt = NULL; 4280 struct st_modedef *STm; 4281 struct st_partstat *STps; 4282 struct st_buffer *buffer; 4283 int i, error; 4284 char *stp; 4285 4286 if (SDp->type != TYPE_TAPE) 4287 return -ENODEV; 4288 if ((stp = st_incompatible(SDp))) { 4289 sdev_printk(KERN_INFO, SDp, 4290 "OnStream tapes are no longer supported;\n"); 4291 sdev_printk(KERN_INFO, SDp, 4292 "please mail to linux-scsi@vger.kernel.org.\n"); 4293 return -ENODEV; 4294 } 4295 4296 scsi_autopm_get_device(SDp); 4297 i = queue_max_segments(SDp->request_queue); 4298 if (st_max_sg_segs < i) 4299 i = st_max_sg_segs; 4300 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4301 if (buffer == NULL) { 4302 sdev_printk(KERN_ERR, SDp, 4303 "st: Can't allocate new tape buffer. " 4304 "Device not attached.\n"); 4305 goto out; 4306 } 4307 4308 disk = alloc_disk(1); 4309 if (!disk) { 4310 sdev_printk(KERN_ERR, SDp, 4311 "st: out of memory. Device not attached.\n"); 4312 goto out_buffer_free; 4313 } 4314 4315 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4316 if (tpnt == NULL) { 4317 sdev_printk(KERN_ERR, SDp, 4318 "st: Can't allocate device descriptor.\n"); 4319 goto out_put_disk; 4320 } 4321 kref_init(&tpnt->kref); 4322 tpnt->disk = disk; 4323 disk->private_data = &tpnt->driver; 4324 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4325 * take queue reference that release_disk() expects. */ 4326 if (!blk_get_queue(SDp->request_queue)) 4327 goto out_put_disk; 4328 disk->queue = SDp->request_queue; 4329 tpnt->driver = &st_template; 4330 4331 tpnt->device = SDp; 4332 if (SDp->scsi_level <= 2) 4333 tpnt->tape_type = MT_ISSCSI1; 4334 else 4335 tpnt->tape_type = MT_ISSCSI2; 4336 4337 tpnt->buffer = buffer; 4338 tpnt->buffer->last_SRpnt = NULL; 4339 4340 tpnt->inited = 0; 4341 tpnt->dirty = 0; 4342 tpnt->in_use = 0; 4343 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4344 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4345 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4346 tpnt->density = 0; 4347 tpnt->do_auto_lock = ST_AUTO_LOCK; 4348 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4349 tpnt->can_partitions = 0; 4350 tpnt->two_fm = ST_TWO_FM; 4351 tpnt->fast_mteom = ST_FAST_MTEOM; 4352 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4353 tpnt->sili = ST_SILI; 4354 tpnt->immediate = ST_NOWAIT; 4355 tpnt->immediate_filemark = 0; 4356 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4357 tpnt->partition = 0; 4358 tpnt->new_partition = 0; 4359 tpnt->nbr_partitions = 0; 4360 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4361 tpnt->long_timeout = ST_LONG_TIMEOUT; 4362 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4363 4364 for (i = 0; i < ST_NBR_MODES; i++) { 4365 STm = &(tpnt->modes[i]); 4366 STm->defined = 0; 4367 STm->sysv = ST_SYSV; 4368 STm->defaults_for_writes = 0; 4369 STm->do_async_writes = ST_ASYNC_WRITES; 4370 STm->do_buffer_writes = ST_BUFFER_WRITES; 4371 STm->do_read_ahead = ST_READ_AHEAD; 4372 STm->default_compression = ST_DONT_TOUCH; 4373 STm->default_blksize = (-1); /* No forced size */ 4374 STm->default_density = (-1); /* No forced density */ 4375 STm->tape = tpnt; 4376 } 4377 4378 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4379 STps = &(tpnt->ps[i]); 4380 STps->rw = ST_IDLE; 4381 STps->eof = ST_NOEOF; 4382 STps->at_sm = 0; 4383 STps->last_block_valid = 0; 4384 STps->drv_block = (-1); 4385 STps->drv_file = (-1); 4386 } 4387 4388 tpnt->current_mode = 0; 4389 tpnt->modes[0].defined = 1; 4390 4391 tpnt->density_changed = tpnt->compression_changed = 4392 tpnt->blksize_changed = 0; 4393 mutex_init(&tpnt->lock); 4394 4395 idr_preload(GFP_KERNEL); 4396 spin_lock(&st_index_lock); 4397 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4398 spin_unlock(&st_index_lock); 4399 idr_preload_end(); 4400 if (error < 0) { 4401 pr_warn("st: idr allocation failed: %d\n", error); 4402 goto out_put_queue; 4403 } 4404 tpnt->index = error; 4405 sprintf(disk->disk_name, "st%d", tpnt->index); 4406 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4407 if (tpnt->stats == NULL) { 4408 sdev_printk(KERN_ERR, SDp, 4409 "st: Can't allocate statistics.\n"); 4410 goto out_idr_remove; 4411 } 4412 4413 dev_set_drvdata(dev, tpnt); 4414 4415 4416 error = create_cdevs(tpnt); 4417 if (error) 4418 goto out_remove_devs; 4419 scsi_autopm_put_device(SDp); 4420 4421 sdev_printk(KERN_NOTICE, SDp, 4422 "Attached scsi tape %s\n", tape_name(tpnt)); 4423 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4424 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4425 queue_dma_alignment(SDp->request_queue) + 1); 4426 4427 return 0; 4428 4429 out_remove_devs: 4430 remove_cdevs(tpnt); 4431 kfree(tpnt->stats); 4432 out_idr_remove: 4433 spin_lock(&st_index_lock); 4434 idr_remove(&st_index_idr, tpnt->index); 4435 spin_unlock(&st_index_lock); 4436 out_put_queue: 4437 blk_put_queue(disk->queue); 4438 out_put_disk: 4439 put_disk(disk); 4440 kfree(tpnt); 4441 out_buffer_free: 4442 kfree(buffer); 4443 out: 4444 scsi_autopm_put_device(SDp); 4445 return -ENODEV; 4446 }; 4447 4448 4449 static int st_remove(struct device *dev) 4450 { 4451 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4452 int index = tpnt->index; 4453 4454 scsi_autopm_get_device(to_scsi_device(dev)); 4455 remove_cdevs(tpnt); 4456 4457 mutex_lock(&st_ref_mutex); 4458 kref_put(&tpnt->kref, scsi_tape_release); 4459 mutex_unlock(&st_ref_mutex); 4460 spin_lock(&st_index_lock); 4461 idr_remove(&st_index_idr, index); 4462 spin_unlock(&st_index_lock); 4463 return 0; 4464 } 4465 4466 /** 4467 * scsi_tape_release - Called to free the Scsi_Tape structure 4468 * @kref: pointer to embedded kref 4469 * 4470 * st_ref_mutex must be held entering this routine. Because it is 4471 * called on last put, you should always use the scsi_tape_get() 4472 * scsi_tape_put() helpers which manipulate the semaphore directly 4473 * and never do a direct kref_put(). 4474 **/ 4475 static void scsi_tape_release(struct kref *kref) 4476 { 4477 struct scsi_tape *tpnt = to_scsi_tape(kref); 4478 struct gendisk *disk = tpnt->disk; 4479 4480 tpnt->device = NULL; 4481 4482 if (tpnt->buffer) { 4483 normalize_buffer(tpnt->buffer); 4484 kfree(tpnt->buffer->reserved_pages); 4485 kfree(tpnt->buffer); 4486 } 4487 4488 disk->private_data = NULL; 4489 put_disk(disk); 4490 kfree(tpnt->stats); 4491 kfree(tpnt); 4492 return; 4493 } 4494 4495 static struct class st_sysfs_class = { 4496 .name = "scsi_tape", 4497 .dev_groups = st_dev_groups, 4498 }; 4499 4500 static int __init init_st(void) 4501 { 4502 int err; 4503 4504 validate_options(); 4505 4506 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4507 verstr, st_fixed_buffer_size, st_max_sg_segs); 4508 4509 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4510 if (debugging) { 4511 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4512 debugging); 4513 } 4514 4515 err = class_register(&st_sysfs_class); 4516 if (err) { 4517 pr_err("Unable register sysfs class for SCSI tapes\n"); 4518 return err; 4519 } 4520 4521 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4522 ST_MAX_TAPE_ENTRIES, "st"); 4523 if (err) { 4524 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4525 SCSI_TAPE_MAJOR); 4526 goto err_class; 4527 } 4528 4529 err = scsi_register_driver(&st_template.gendrv); 4530 if (err) 4531 goto err_chrdev; 4532 4533 return 0; 4534 4535 err_chrdev: 4536 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4537 ST_MAX_TAPE_ENTRIES); 4538 err_class: 4539 class_unregister(&st_sysfs_class); 4540 return err; 4541 } 4542 4543 static void __exit exit_st(void) 4544 { 4545 scsi_unregister_driver(&st_template.gendrv); 4546 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4547 ST_MAX_TAPE_ENTRIES); 4548 class_unregister(&st_sysfs_class); 4549 idr_destroy(&st_index_idr); 4550 printk(KERN_INFO "st: Unloaded.\n"); 4551 } 4552 4553 module_init(init_st); 4554 module_exit(exit_st); 4555 4556 4557 /* The sysfs driver interface. Read-only at the moment */ 4558 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4559 { 4560 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4561 } 4562 static DRIVER_ATTR_RO(try_direct_io); 4563 4564 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4565 { 4566 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4567 } 4568 static DRIVER_ATTR_RO(fixed_buffer_size); 4569 4570 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4571 { 4572 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4573 } 4574 static DRIVER_ATTR_RO(max_sg_segs); 4575 4576 static ssize_t version_show(struct device_driver *ddd, char *buf) 4577 { 4578 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4579 } 4580 static DRIVER_ATTR_RO(version); 4581 4582 #if DEBUG 4583 static ssize_t debug_flag_store(struct device_driver *ddp, 4584 const char *buf, size_t count) 4585 { 4586 /* We only care what the first byte of the data is the rest is unused. 4587 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4588 * other values have -EINVAL returned if they are passed in. 4589 */ 4590 if (count > 0) { 4591 if (buf[0] == '0') { 4592 debugging = NO_DEBUG; 4593 return count; 4594 } else if (buf[0] == '1') { 4595 debugging = 1; 4596 return count; 4597 } 4598 } 4599 return -EINVAL; 4600 } 4601 4602 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4603 { 4604 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4605 } 4606 static DRIVER_ATTR_RW(debug_flag); 4607 #endif 4608 4609 static struct attribute *st_drv_attrs[] = { 4610 &driver_attr_try_direct_io.attr, 4611 &driver_attr_fixed_buffer_size.attr, 4612 &driver_attr_max_sg_segs.attr, 4613 &driver_attr_version.attr, 4614 #if DEBUG 4615 &driver_attr_debug_flag.attr, 4616 #endif 4617 NULL, 4618 }; 4619 ATTRIBUTE_GROUPS(st_drv); 4620 4621 /* The sysfs simple class interface */ 4622 static ssize_t 4623 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4624 { 4625 struct st_modedef *STm = dev_get_drvdata(dev); 4626 ssize_t l = 0; 4627 4628 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4629 return l; 4630 } 4631 static DEVICE_ATTR_RO(defined); 4632 4633 static ssize_t 4634 default_blksize_show(struct device *dev, struct device_attribute *attr, 4635 char *buf) 4636 { 4637 struct st_modedef *STm = dev_get_drvdata(dev); 4638 ssize_t l = 0; 4639 4640 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4641 return l; 4642 } 4643 static DEVICE_ATTR_RO(default_blksize); 4644 4645 static ssize_t 4646 default_density_show(struct device *dev, struct device_attribute *attr, 4647 char *buf) 4648 { 4649 struct st_modedef *STm = dev_get_drvdata(dev); 4650 ssize_t l = 0; 4651 char *fmt; 4652 4653 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4654 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4655 return l; 4656 } 4657 static DEVICE_ATTR_RO(default_density); 4658 4659 static ssize_t 4660 default_compression_show(struct device *dev, struct device_attribute *attr, 4661 char *buf) 4662 { 4663 struct st_modedef *STm = dev_get_drvdata(dev); 4664 ssize_t l = 0; 4665 4666 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4667 return l; 4668 } 4669 static DEVICE_ATTR_RO(default_compression); 4670 4671 static ssize_t 4672 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4673 { 4674 struct st_modedef *STm = dev_get_drvdata(dev); 4675 struct scsi_tape *STp = STm->tape; 4676 int options; 4677 ssize_t l = 0; 4678 4679 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4680 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4681 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4682 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4683 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4684 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4685 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4686 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4687 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4688 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4689 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4690 options |= STm->sysv ? MT_ST_SYSV : 0; 4691 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4692 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4693 options |= STp->sili ? MT_ST_SILI : 0; 4694 4695 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4696 return l; 4697 } 4698 static DEVICE_ATTR_RO(options); 4699 4700 /* Support for tape stats */ 4701 4702 /** 4703 * read_cnt_show - return read count - count of reads made from tape drive 4704 * @dev: struct device 4705 * @attr: attribute structure 4706 * @buf: buffer to return formatted data in 4707 */ 4708 static ssize_t read_cnt_show(struct device *dev, 4709 struct device_attribute *attr, char *buf) 4710 { 4711 struct st_modedef *STm = dev_get_drvdata(dev); 4712 4713 return sprintf(buf, "%lld", 4714 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4715 } 4716 static DEVICE_ATTR_RO(read_cnt); 4717 4718 /** 4719 * read_byte_cnt_show - return read byte count - tape drives 4720 * may use blocks less than 512 bytes this gives the raw byte count of 4721 * of data read from the tape drive. 4722 * @dev: struct device 4723 * @attr: attribute structure 4724 * @buf: buffer to return formatted data in 4725 */ 4726 static ssize_t read_byte_cnt_show(struct device *dev, 4727 struct device_attribute *attr, char *buf) 4728 { 4729 struct st_modedef *STm = dev_get_drvdata(dev); 4730 4731 return sprintf(buf, "%lld", 4732 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4733 } 4734 static DEVICE_ATTR_RO(read_byte_cnt); 4735 4736 /** 4737 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4738 * @dev: struct device 4739 * @attr: attribute structure 4740 * @buf: buffer to return formatted data in 4741 */ 4742 static ssize_t read_ns_show(struct device *dev, 4743 struct device_attribute *attr, char *buf) 4744 { 4745 struct st_modedef *STm = dev_get_drvdata(dev); 4746 4747 return sprintf(buf, "%lld", 4748 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4749 } 4750 static DEVICE_ATTR_RO(read_ns); 4751 4752 /** 4753 * write_cnt_show - write count - number of user calls 4754 * to write(2) that have written data to tape. 4755 * @dev: struct device 4756 * @attr: attribute structure 4757 * @buf: buffer to return formatted data in 4758 */ 4759 static ssize_t write_cnt_show(struct device *dev, 4760 struct device_attribute *attr, char *buf) 4761 { 4762 struct st_modedef *STm = dev_get_drvdata(dev); 4763 4764 return sprintf(buf, "%lld", 4765 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4766 } 4767 static DEVICE_ATTR_RO(write_cnt); 4768 4769 /** 4770 * write_byte_cnt_show - write byte count - raw count of 4771 * bytes written to tape. 4772 * @dev: struct device 4773 * @attr: attribute structure 4774 * @buf: buffer to return formatted data in 4775 */ 4776 static ssize_t write_byte_cnt_show(struct device *dev, 4777 struct device_attribute *attr, char *buf) 4778 { 4779 struct st_modedef *STm = dev_get_drvdata(dev); 4780 4781 return sprintf(buf, "%lld", 4782 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4783 } 4784 static DEVICE_ATTR_RO(write_byte_cnt); 4785 4786 /** 4787 * write_ns_show - write ns - number of nanoseconds waiting on write 4788 * requests to complete. 4789 * @dev: struct device 4790 * @attr: attribute structure 4791 * @buf: buffer to return formatted data in 4792 */ 4793 static ssize_t write_ns_show(struct device *dev, 4794 struct device_attribute *attr, char *buf) 4795 { 4796 struct st_modedef *STm = dev_get_drvdata(dev); 4797 4798 return sprintf(buf, "%lld", 4799 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4800 } 4801 static DEVICE_ATTR_RO(write_ns); 4802 4803 /** 4804 * in_flight_show - number of I/Os currently in flight - 4805 * in most cases this will be either 0 or 1. It may be higher if someone 4806 * has also issued other SCSI commands such as via an ioctl. 4807 * @dev: struct device 4808 * @attr: attribute structure 4809 * @buf: buffer to return formatted data in 4810 */ 4811 static ssize_t in_flight_show(struct device *dev, 4812 struct device_attribute *attr, char *buf) 4813 { 4814 struct st_modedef *STm = dev_get_drvdata(dev); 4815 4816 return sprintf(buf, "%lld", 4817 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4818 } 4819 static DEVICE_ATTR_RO(in_flight); 4820 4821 /** 4822 * io_ns_show - io wait ns - this is the number of ns spent 4823 * waiting on all I/O to complete. This includes tape movement commands 4824 * such as rewinding, seeking to end of file or tape, it also includes 4825 * read and write. To determine the time spent on tape movement 4826 * subtract the read and write ns from this value. 4827 * @dev: struct device 4828 * @attr: attribute structure 4829 * @buf: buffer to return formatted data in 4830 */ 4831 static ssize_t io_ns_show(struct device *dev, 4832 struct device_attribute *attr, char *buf) 4833 { 4834 struct st_modedef *STm = dev_get_drvdata(dev); 4835 4836 return sprintf(buf, "%lld", 4837 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4838 } 4839 static DEVICE_ATTR_RO(io_ns); 4840 4841 /** 4842 * other_cnt_show - other io count - this is the number of 4843 * I/O requests other than read and write requests. 4844 * Typically these are tape movement requests but will include driver 4845 * tape movement. This includes only requests issued by the st driver. 4846 * @dev: struct device 4847 * @attr: attribute structure 4848 * @buf: buffer to return formatted data in 4849 */ 4850 static ssize_t other_cnt_show(struct device *dev, 4851 struct device_attribute *attr, char *buf) 4852 { 4853 struct st_modedef *STm = dev_get_drvdata(dev); 4854 4855 return sprintf(buf, "%lld", 4856 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4857 } 4858 static DEVICE_ATTR_RO(other_cnt); 4859 4860 /** 4861 * resid_cnt_show - A count of the number of times we get a residual 4862 * count - this should indicate someone issuing reads larger than the 4863 * block size on tape. 4864 * @dev: struct device 4865 * @attr: attribute structure 4866 * @buf: buffer to return formatted data in 4867 */ 4868 static ssize_t resid_cnt_show(struct device *dev, 4869 struct device_attribute *attr, char *buf) 4870 { 4871 struct st_modedef *STm = dev_get_drvdata(dev); 4872 4873 return sprintf(buf, "%lld", 4874 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4875 } 4876 static DEVICE_ATTR_RO(resid_cnt); 4877 4878 static struct attribute *st_dev_attrs[] = { 4879 &dev_attr_defined.attr, 4880 &dev_attr_default_blksize.attr, 4881 &dev_attr_default_density.attr, 4882 &dev_attr_default_compression.attr, 4883 &dev_attr_options.attr, 4884 NULL, 4885 }; 4886 4887 static struct attribute *st_stats_attrs[] = { 4888 &dev_attr_read_cnt.attr, 4889 &dev_attr_read_byte_cnt.attr, 4890 &dev_attr_read_ns.attr, 4891 &dev_attr_write_cnt.attr, 4892 &dev_attr_write_byte_cnt.attr, 4893 &dev_attr_write_ns.attr, 4894 &dev_attr_in_flight.attr, 4895 &dev_attr_io_ns.attr, 4896 &dev_attr_other_cnt.attr, 4897 &dev_attr_resid_cnt.attr, 4898 NULL, 4899 }; 4900 4901 static struct attribute_group stats_group = { 4902 .name = "stats", 4903 .attrs = st_stats_attrs, 4904 }; 4905 4906 static struct attribute_group st_group = { 4907 .attrs = st_dev_attrs, 4908 }; 4909 4910 static const struct attribute_group *st_dev_groups[] = { 4911 &st_group, 4912 &stats_group, 4913 NULL, 4914 }; 4915 4916 /* The following functions may be useful for a larger audience. */ 4917 static int sgl_map_user_pages(struct st_buffer *STbp, 4918 const unsigned int max_pages, unsigned long uaddr, 4919 size_t count, int rw) 4920 { 4921 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4922 unsigned long start = uaddr >> PAGE_SHIFT; 4923 const int nr_pages = end - start; 4924 int res, i; 4925 struct page **pages; 4926 struct rq_map_data *mdata = &STbp->map_data; 4927 4928 /* User attempted Overflow! */ 4929 if ((uaddr + count) < uaddr) 4930 return -EINVAL; 4931 4932 /* Too big */ 4933 if (nr_pages > max_pages) 4934 return -ENOMEM; 4935 4936 /* Hmm? */ 4937 if (count == 0) 4938 return 0; 4939 4940 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4941 if (pages == NULL) 4942 return -ENOMEM; 4943 4944 /* Try to fault in all of the necessary pages */ 4945 /* rw==READ means read from drive, write into memory area */ 4946 res = pin_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0, 4947 pages); 4948 4949 /* Errors and no page mapped should return here */ 4950 if (res < nr_pages) 4951 goto out_unmap; 4952 4953 for (i=0; i < nr_pages; i++) { 4954 /* FIXME: flush superflous for rw==READ, 4955 * probably wrong function for rw==WRITE 4956 */ 4957 flush_dcache_page(pages[i]); 4958 } 4959 4960 mdata->offset = uaddr & ~PAGE_MASK; 4961 STbp->mapped_pages = pages; 4962 4963 return nr_pages; 4964 out_unmap: 4965 if (res > 0) { 4966 unpin_user_pages(pages, res); 4967 res = 0; 4968 } 4969 kfree(pages); 4970 return res; 4971 } 4972 4973 4974 /* And unmap them... */ 4975 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4976 const unsigned int nr_pages, int dirtied) 4977 { 4978 /* FIXME: cache flush missing for rw==READ */ 4979 unpin_user_pages_dirty_lock(STbp->mapped_pages, nr_pages, dirtied); 4980 4981 kfree(STbp->mapped_pages); 4982 STbp->mapped_pages = NULL; 4983 4984 return 0; 4985 } 4986