1/* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2014 Douglas Gilbert 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 */ 18 19static int sg_version_num = 30536; /* 2 digits for each component */ 20#define SG_VERSION_STR "3.5.36" 21 22/* 23 * D. P. Gilbert (dgilbert@interlog.com), notes: 24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 26 * (otherwise the macros compile to empty statements). 27 * 28 */ 29#include <linux/module.h> 30 31#include <linux/fs.h> 32#include <linux/kernel.h> 33#include <linux/sched.h> 34#include <linux/string.h> 35#include <linux/mm.h> 36#include <linux/aio.h> 37#include <linux/errno.h> 38#include <linux/mtio.h> 39#include <linux/ioctl.h> 40#include <linux/slab.h> 41#include <linux/fcntl.h> 42#include <linux/init.h> 43#include <linux/poll.h> 44#include <linux/moduleparam.h> 45#include <linux/cdev.h> 46#include <linux/idr.h> 47#include <linux/seq_file.h> 48#include <linux/blkdev.h> 49#include <linux/delay.h> 50#include <linux/blktrace_api.h> 51#include <linux/mutex.h> 52#include <linux/atomic.h> 53#include <linux/ratelimit.h> 54 55#include "scsi.h" 56#include <scsi/scsi_dbg.h> 57#include <scsi/scsi_host.h> 58#include <scsi/scsi_driver.h> 59#include <scsi/scsi_ioctl.h> 60#include <scsi/sg.h> 61 62#include "scsi_logging.h" 63 64#ifdef CONFIG_SCSI_PROC_FS 65#include <linux/proc_fs.h> 66static char *sg_version_date = "20140603"; 67 68static int sg_proc_init(void); 69static void sg_proc_cleanup(void); 70#endif 71 72#define SG_ALLOW_DIO_DEF 0 73 74#define SG_MAX_DEVS 32768 75 76/* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type 77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater 78 * than 16 bytes are "variable length" whose length is a multiple of 4 79 */ 80#define SG_MAX_CDB_SIZE 252 81 82/* 83 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 84 * Then when using 32 bit integers x * m may overflow during the calculation. 85 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 86 * calculates the same, but prevents the overflow when both m and d 87 * are "small" numbers (like HZ and USER_HZ). 88 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 89 * in 32 bits. 90 */ 91#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 92 93#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 94 95int sg_big_buff = SG_DEF_RESERVED_SIZE; 96/* N.B. This variable is readable and writeable via 97 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 98 of this size (or less if there is not enough memory) will be reserved 99 for use by this file descriptor. [Deprecated usage: this variable is also 100 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 101 the kernel (i.e. it is not a module).] */ 102static int def_reserved_size = -1; /* picks up init parameter */ 103static int sg_allow_dio = SG_ALLOW_DIO_DEF; 104 105static int scatter_elem_sz = SG_SCATTER_SZ; 106static int scatter_elem_sz_prev = SG_SCATTER_SZ; 107 108#define SG_SECTOR_SZ 512 109 110static int sg_add_device(struct device *, struct class_interface *); 111static void sg_remove_device(struct device *, struct class_interface *); 112 113static DEFINE_IDR(sg_index_idr); 114static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 115 file descriptor list for device */ 116 117static struct class_interface sg_interface = { 118 .add_dev = sg_add_device, 119 .remove_dev = sg_remove_device, 120}; 121 122typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 123 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 124 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 125 unsigned bufflen; /* Size of (aggregate) data buffer */ 126 struct page **pages; 127 int page_order; 128 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 129 unsigned char cmd_opcode; /* first byte of command */ 130} Sg_scatter_hold; 131 132struct sg_device; /* forward declarations */ 133struct sg_fd; 134 135typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 136 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 137 struct sg_fd *parentfp; /* NULL -> not in use */ 138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 140 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 142 char orphan; /* 1 -> drop on sight, 0 -> normal */ 143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 144 /* done protected by rq_list_lock */ 145 char done; /* 0->before bh, 1->before read, 2->read */ 146 struct request *rq; 147 struct bio *bio; 148 struct execute_work ew; 149} Sg_request; 150 151typedef struct sg_fd { /* holds the state of a file descriptor */ 152 struct list_head sfd_siblings; /* protected by device's sfd_lock */ 153 struct sg_device *parentdp; /* owning device */ 154 wait_queue_head_t read_wait; /* queue read until command done */ 155 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 156 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 157 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 158 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 159 unsigned save_scat_len; /* original length of trunc. scat. element */ 160 Sg_request *headrp; /* head of request slist, NULL->empty */ 161 struct fasync_struct *async_qp; /* used by asynchronous notification */ 162 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 163 char low_dma; /* as in parent but possibly overridden to 1 */ 164 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 165 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 166 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ 167 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 168 char mmap_called; /* 0 -> mmap() never called on this fd */ 169 struct kref f_ref; 170 struct execute_work ew; 171} Sg_fd; 172 173typedef struct sg_device { /* holds the state of each scsi generic device */ 174 struct scsi_device *device; 175 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ 176 struct mutex open_rel_lock; /* held when in open() or release() */ 177 int sg_tablesize; /* adapter's max scatter-gather table size */ 178 u32 index; /* device index number */ 179 struct list_head sfds; 180 rwlock_t sfd_lock; /* protect access to sfd list */ 181 atomic_t detaching; /* 0->device usable, 1->device detaching */ 182 bool exclude; /* 1->open(O_EXCL) succeeded and is active */ 183 int open_cnt; /* count of opens (perhaps < num(sfds) ) */ 184 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 185 struct gendisk *disk; 186 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 187 struct kref d_ref; 188} Sg_device; 189 190/* tasklet or soft irq callback */ 191static void sg_rq_end_io(struct request *rq, int uptodate); 192static int sg_start_req(Sg_request *srp, unsigned char *cmd); 193static int sg_finish_rem_req(Sg_request * srp); 194static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 195static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 196 Sg_request * srp); 197static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 198 const char __user *buf, size_t count, int blocking, 199 int read_only, int sg_io_owned, Sg_request **o_srp); 200static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 201 unsigned char *cmnd, int timeout, int blocking); 202static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 203static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); 204static void sg_build_reserve(Sg_fd * sfp, int req_size); 205static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 206static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 207static Sg_fd *sg_add_sfp(Sg_device * sdp); 208static void sg_remove_sfp(struct kref *); 209static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 210static Sg_request *sg_add_request(Sg_fd * sfp); 211static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 212static int sg_res_in_use(Sg_fd * sfp); 213static Sg_device *sg_get_dev(int dev); 214static void sg_device_destroy(struct kref *kref); 215 216#define SZ_SG_HEADER sizeof(struct sg_header) 217#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 218#define SZ_SG_IOVEC sizeof(sg_iovec_t) 219#define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 220 221#define sg_printk(prefix, sdp, fmt, a...) \ 222 sdev_printk(prefix, (sdp)->device, "[%s] " fmt, \ 223 (sdp)->disk->disk_name, ##a) 224 225static int sg_allow_access(struct file *filp, unsigned char *cmd) 226{ 227 struct sg_fd *sfp = filp->private_data; 228 229 if (sfp->parentdp->device->type == TYPE_SCANNER) 230 return 0; 231 232 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 233} 234 235static int 236open_wait(Sg_device *sdp, int flags) 237{ 238 int retval = 0; 239 240 if (flags & O_EXCL) { 241 while (sdp->open_cnt > 0) { 242 mutex_unlock(&sdp->open_rel_lock); 243 retval = wait_event_interruptible(sdp->open_wait, 244 (atomic_read(&sdp->detaching) || 245 !sdp->open_cnt)); 246 mutex_lock(&sdp->open_rel_lock); 247 248 if (retval) /* -ERESTARTSYS */ 249 return retval; 250 if (atomic_read(&sdp->detaching)) 251 return -ENODEV; 252 } 253 } else { 254 while (sdp->exclude) { 255 mutex_unlock(&sdp->open_rel_lock); 256 retval = wait_event_interruptible(sdp->open_wait, 257 (atomic_read(&sdp->detaching) || 258 !sdp->exclude)); 259 mutex_lock(&sdp->open_rel_lock); 260 261 if (retval) /* -ERESTARTSYS */ 262 return retval; 263 if (atomic_read(&sdp->detaching)) 264 return -ENODEV; 265 } 266 } 267 268 return retval; 269} 270 271/* Returns 0 on success, else a negated errno value */ 272static int 273sg_open(struct inode *inode, struct file *filp) 274{ 275 int dev = iminor(inode); 276 int flags = filp->f_flags; 277 struct request_queue *q; 278 Sg_device *sdp; 279 Sg_fd *sfp; 280 int retval; 281 282 nonseekable_open(inode, filp); 283 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) 284 return -EPERM; /* Can't lock it with read only access */ 285 sdp = sg_get_dev(dev); 286 if (IS_ERR(sdp)) 287 return PTR_ERR(sdp); 288 289 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 290 "sg_open: flags=0x%x\n", flags)); 291 292 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 293 /* Prevent the device driver from vanishing while we sleep */ 294 retval = scsi_device_get(sdp->device); 295 if (retval) 296 goto sg_put; 297 298 retval = scsi_autopm_get_device(sdp->device); 299 if (retval) 300 goto sdp_put; 301 302 /* scsi_block_when_processing_errors() may block so bypass 303 * check if O_NONBLOCK. Permits SCSI commands to be issued 304 * during error recovery. Tread carefully. */ 305 if (!((flags & O_NONBLOCK) || 306 scsi_block_when_processing_errors(sdp->device))) { 307 retval = -ENXIO; 308 /* we are in error recovery for this device */ 309 goto error_out; 310 } 311 312 mutex_lock(&sdp->open_rel_lock); 313 if (flags & O_NONBLOCK) { 314 if (flags & O_EXCL) { 315 if (sdp->open_cnt > 0) { 316 retval = -EBUSY; 317 goto error_mutex_locked; 318 } 319 } else { 320 if (sdp->exclude) { 321 retval = -EBUSY; 322 goto error_mutex_locked; 323 } 324 } 325 } else { 326 retval = open_wait(sdp, flags); 327 if (retval) /* -ERESTARTSYS or -ENODEV */ 328 goto error_mutex_locked; 329 } 330 331 /* N.B. at this point we are holding the open_rel_lock */ 332 if (flags & O_EXCL) 333 sdp->exclude = true; 334 335 if (sdp->open_cnt < 1) { /* no existing opens */ 336 sdp->sgdebug = 0; 337 q = sdp->device->request_queue; 338 sdp->sg_tablesize = queue_max_segments(q); 339 } 340 sfp = sg_add_sfp(sdp); 341 if (IS_ERR(sfp)) { 342 retval = PTR_ERR(sfp); 343 goto out_undo; 344 } 345 346 filp->private_data = sfp; 347 sdp->open_cnt++; 348 mutex_unlock(&sdp->open_rel_lock); 349 350 retval = 0; 351sg_put: 352 kref_put(&sdp->d_ref, sg_device_destroy); 353 return retval; 354 355out_undo: 356 if (flags & O_EXCL) { 357 sdp->exclude = false; /* undo if error */ 358 wake_up_interruptible(&sdp->open_wait); 359 } 360error_mutex_locked: 361 mutex_unlock(&sdp->open_rel_lock); 362error_out: 363 scsi_autopm_put_device(sdp->device); 364sdp_put: 365 scsi_device_put(sdp->device); 366 goto sg_put; 367} 368 369/* Release resources associated with a successful sg_open() 370 * Returns 0 on success, else a negated errno value */ 371static int 372sg_release(struct inode *inode, struct file *filp) 373{ 374 Sg_device *sdp; 375 Sg_fd *sfp; 376 377 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 378 return -ENXIO; 379 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); 380 381 mutex_lock(&sdp->open_rel_lock); 382 scsi_autopm_put_device(sdp->device); 383 kref_put(&sfp->f_ref, sg_remove_sfp); 384 sdp->open_cnt--; 385 386 /* possibly many open()s waiting on exlude clearing, start many; 387 * only open(O_EXCL)s wait on 0==open_cnt so only start one */ 388 if (sdp->exclude) { 389 sdp->exclude = false; 390 wake_up_interruptible_all(&sdp->open_wait); 391 } else if (0 == sdp->open_cnt) { 392 wake_up_interruptible(&sdp->open_wait); 393 } 394 mutex_unlock(&sdp->open_rel_lock); 395 return 0; 396} 397 398static ssize_t 399sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 400{ 401 Sg_device *sdp; 402 Sg_fd *sfp; 403 Sg_request *srp; 404 int req_pack_id = -1; 405 sg_io_hdr_t *hp; 406 struct sg_header *old_hdr = NULL; 407 int retval = 0; 408 409 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 410 return -ENXIO; 411 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 412 "sg_read: count=%d\n", (int) count)); 413 414 if (!access_ok(VERIFY_WRITE, buf, count)) 415 return -EFAULT; 416 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 417 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 418 if (!old_hdr) 419 return -ENOMEM; 420 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 421 retval = -EFAULT; 422 goto free_old_hdr; 423 } 424 if (old_hdr->reply_len < 0) { 425 if (count >= SZ_SG_IO_HDR) { 426 sg_io_hdr_t *new_hdr; 427 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 428 if (!new_hdr) { 429 retval = -ENOMEM; 430 goto free_old_hdr; 431 } 432 retval =__copy_from_user 433 (new_hdr, buf, SZ_SG_IO_HDR); 434 req_pack_id = new_hdr->pack_id; 435 kfree(new_hdr); 436 if (retval) { 437 retval = -EFAULT; 438 goto free_old_hdr; 439 } 440 } 441 } else 442 req_pack_id = old_hdr->pack_id; 443 } 444 srp = sg_get_rq_mark(sfp, req_pack_id); 445 if (!srp) { /* now wait on packet to arrive */ 446 if (atomic_read(&sdp->detaching)) { 447 retval = -ENODEV; 448 goto free_old_hdr; 449 } 450 if (filp->f_flags & O_NONBLOCK) { 451 retval = -EAGAIN; 452 goto free_old_hdr; 453 } 454 retval = wait_event_interruptible(sfp->read_wait, 455 (atomic_read(&sdp->detaching) || 456 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 457 if (atomic_read(&sdp->detaching)) { 458 retval = -ENODEV; 459 goto free_old_hdr; 460 } 461 if (retval) { 462 /* -ERESTARTSYS as signal hit process */ 463 goto free_old_hdr; 464 } 465 } 466 if (srp->header.interface_id != '\0') { 467 retval = sg_new_read(sfp, buf, count, srp); 468 goto free_old_hdr; 469 } 470 471 hp = &srp->header; 472 if (old_hdr == NULL) { 473 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 474 if (! old_hdr) { 475 retval = -ENOMEM; 476 goto free_old_hdr; 477 } 478 } 479 memset(old_hdr, 0, SZ_SG_HEADER); 480 old_hdr->reply_len = (int) hp->timeout; 481 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 482 old_hdr->pack_id = hp->pack_id; 483 old_hdr->twelve_byte = 484 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 485 old_hdr->target_status = hp->masked_status; 486 old_hdr->host_status = hp->host_status; 487 old_hdr->driver_status = hp->driver_status; 488 if ((CHECK_CONDITION & hp->masked_status) || 489 (DRIVER_SENSE & hp->driver_status)) 490 memcpy(old_hdr->sense_buffer, srp->sense_b, 491 sizeof (old_hdr->sense_buffer)); 492 switch (hp->host_status) { 493 /* This setup of 'result' is for backward compatibility and is best 494 ignored by the user who should use target, host + driver status */ 495 case DID_OK: 496 case DID_PASSTHROUGH: 497 case DID_SOFT_ERROR: 498 old_hdr->result = 0; 499 break; 500 case DID_NO_CONNECT: 501 case DID_BUS_BUSY: 502 case DID_TIME_OUT: 503 old_hdr->result = EBUSY; 504 break; 505 case DID_BAD_TARGET: 506 case DID_ABORT: 507 case DID_PARITY: 508 case DID_RESET: 509 case DID_BAD_INTR: 510 old_hdr->result = EIO; 511 break; 512 case DID_ERROR: 513 old_hdr->result = (srp->sense_b[0] == 0 && 514 hp->masked_status == GOOD) ? 0 : EIO; 515 break; 516 default: 517 old_hdr->result = EIO; 518 break; 519 } 520 521 /* Now copy the result back to the user buffer. */ 522 if (count >= SZ_SG_HEADER) { 523 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 524 retval = -EFAULT; 525 goto free_old_hdr; 526 } 527 buf += SZ_SG_HEADER; 528 if (count > old_hdr->reply_len) 529 count = old_hdr->reply_len; 530 if (count > SZ_SG_HEADER) { 531 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 532 retval = -EFAULT; 533 goto free_old_hdr; 534 } 535 } 536 } else 537 count = (old_hdr->result == 0) ? 0 : -EIO; 538 sg_finish_rem_req(srp); 539 retval = count; 540free_old_hdr: 541 kfree(old_hdr); 542 return retval; 543} 544 545static ssize_t 546sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 547{ 548 sg_io_hdr_t *hp = &srp->header; 549 int err = 0; 550 int len; 551 552 if (count < SZ_SG_IO_HDR) { 553 err = -EINVAL; 554 goto err_out; 555 } 556 hp->sb_len_wr = 0; 557 if ((hp->mx_sb_len > 0) && hp->sbp) { 558 if ((CHECK_CONDITION & hp->masked_status) || 559 (DRIVER_SENSE & hp->driver_status)) { 560 int sb_len = SCSI_SENSE_BUFFERSIZE; 561 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 562 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 563 len = (len > sb_len) ? sb_len : len; 564 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 565 err = -EFAULT; 566 goto err_out; 567 } 568 hp->sb_len_wr = len; 569 } 570 } 571 if (hp->masked_status || hp->host_status || hp->driver_status) 572 hp->info |= SG_INFO_CHECK; 573 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 574 err = -EFAULT; 575 goto err_out; 576 } 577err_out: 578 err = sg_finish_rem_req(srp); 579 return (0 == err) ? count : err; 580} 581 582static ssize_t 583sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 584{ 585 int mxsize, cmd_size, k; 586 int input_size, blocking; 587 unsigned char opcode; 588 Sg_device *sdp; 589 Sg_fd *sfp; 590 Sg_request *srp; 591 struct sg_header old_hdr; 592 sg_io_hdr_t *hp; 593 unsigned char cmnd[SG_MAX_CDB_SIZE]; 594 595 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 596 return -ENXIO; 597 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 598 "sg_write: count=%d\n", (int) count)); 599 if (atomic_read(&sdp->detaching)) 600 return -ENODEV; 601 if (!((filp->f_flags & O_NONBLOCK) || 602 scsi_block_when_processing_errors(sdp->device))) 603 return -ENXIO; 604 605 if (!access_ok(VERIFY_READ, buf, count)) 606 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 607 if (count < SZ_SG_HEADER) 608 return -EIO; 609 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 610 return -EFAULT; 611 blocking = !(filp->f_flags & O_NONBLOCK); 612 if (old_hdr.reply_len < 0) 613 return sg_new_write(sfp, filp, buf, count, 614 blocking, 0, 0, NULL); 615 if (count < (SZ_SG_HEADER + 6)) 616 return -EIO; /* The minimum scsi command length is 6 bytes. */ 617 618 if (!(srp = sg_add_request(sfp))) { 619 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, 620 "sg_write: queue full\n")); 621 return -EDOM; 622 } 623 buf += SZ_SG_HEADER; 624 __get_user(opcode, buf); 625 if (sfp->next_cmd_len > 0) { 626 cmd_size = sfp->next_cmd_len; 627 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 628 } else { 629 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 630 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 631 cmd_size = 12; 632 } 633 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, 634 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 635/* Determine buffer size. */ 636 input_size = count - cmd_size; 637 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 638 mxsize -= SZ_SG_HEADER; 639 input_size -= SZ_SG_HEADER; 640 if (input_size < 0) { 641 sg_remove_request(sfp, srp); 642 return -EIO; /* User did not pass enough bytes for this command. */ 643 } 644 hp = &srp->header; 645 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 646 hp->cmd_len = (unsigned char) cmd_size; 647 hp->iovec_count = 0; 648 hp->mx_sb_len = 0; 649 if (input_size > 0) 650 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 651 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 652 else 653 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 654 hp->dxfer_len = mxsize; 655 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 656 hp->dxferp = (char __user *)buf + cmd_size; 657 else 658 hp->dxferp = NULL; 659 hp->sbp = NULL; 660 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 661 hp->flags = input_size; /* structure abuse ... */ 662 hp->pack_id = old_hdr.pack_id; 663 hp->usr_ptr = NULL; 664 if (__copy_from_user(cmnd, buf, cmd_size)) 665 return -EFAULT; 666 /* 667 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 668 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 669 * is a non-zero input_size, so emit a warning. 670 */ 671 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 672 static char cmd[TASK_COMM_LEN]; 673 if (strcmp(current->comm, cmd)) { 674 printk_ratelimited(KERN_WARNING 675 "sg_write: data in/out %d/%d bytes " 676 "for SCSI command 0x%x-- guessing " 677 "data in;\n program %s not setting " 678 "count and/or reply_len properly\n", 679 old_hdr.reply_len - (int)SZ_SG_HEADER, 680 input_size, (unsigned int) cmnd[0], 681 current->comm); 682 strcpy(cmd, current->comm); 683 } 684 } 685 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 686 return (k < 0) ? k : count; 687} 688 689static ssize_t 690sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 691 size_t count, int blocking, int read_only, int sg_io_owned, 692 Sg_request **o_srp) 693{ 694 int k; 695 Sg_request *srp; 696 sg_io_hdr_t *hp; 697 unsigned char cmnd[SG_MAX_CDB_SIZE]; 698 int timeout; 699 unsigned long ul_timeout; 700 701 if (count < SZ_SG_IO_HDR) 702 return -EINVAL; 703 if (!access_ok(VERIFY_READ, buf, count)) 704 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 705 706 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 707 if (!(srp = sg_add_request(sfp))) { 708 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 709 "sg_new_write: queue full\n")); 710 return -EDOM; 711 } 712 srp->sg_io_owned = sg_io_owned; 713 hp = &srp->header; 714 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 715 sg_remove_request(sfp, srp); 716 return -EFAULT; 717 } 718 if (hp->interface_id != 'S') { 719 sg_remove_request(sfp, srp); 720 return -ENOSYS; 721 } 722 if (hp->flags & SG_FLAG_MMAP_IO) { 723 if (hp->dxfer_len > sfp->reserve.bufflen) { 724 sg_remove_request(sfp, srp); 725 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 726 } 727 if (hp->flags & SG_FLAG_DIRECT_IO) { 728 sg_remove_request(sfp, srp); 729 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 730 } 731 if (sg_res_in_use(sfp)) { 732 sg_remove_request(sfp, srp); 733 return -EBUSY; /* reserve buffer already being used */ 734 } 735 } 736 ul_timeout = msecs_to_jiffies(srp->header.timeout); 737 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 738 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 739 sg_remove_request(sfp, srp); 740 return -EMSGSIZE; 741 } 742 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 743 sg_remove_request(sfp, srp); 744 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 745 } 746 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 747 sg_remove_request(sfp, srp); 748 return -EFAULT; 749 } 750 if (read_only && sg_allow_access(file, cmnd)) { 751 sg_remove_request(sfp, srp); 752 return -EPERM; 753 } 754 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 755 if (k < 0) 756 return k; 757 if (o_srp) 758 *o_srp = srp; 759 return count; 760} 761 762static int 763sg_common_write(Sg_fd * sfp, Sg_request * srp, 764 unsigned char *cmnd, int timeout, int blocking) 765{ 766 int k, data_dir, at_head; 767 Sg_device *sdp = sfp->parentdp; 768 sg_io_hdr_t *hp = &srp->header; 769 770 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 771 hp->status = 0; 772 hp->masked_status = 0; 773 hp->msg_status = 0; 774 hp->info = 0; 775 hp->host_status = 0; 776 hp->driver_status = 0; 777 hp->resid = 0; 778 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 779 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 780 (int) cmnd[0], (int) hp->cmd_len)); 781 782 k = sg_start_req(srp, cmnd); 783 if (k) { 784 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 785 "sg_common_write: start_req err=%d\n", k)); 786 sg_finish_rem_req(srp); 787 return k; /* probably out of space --> ENOMEM */ 788 } 789 if (atomic_read(&sdp->detaching)) { 790 if (srp->bio) 791 blk_end_request_all(srp->rq, -EIO); 792 sg_finish_rem_req(srp); 793 return -ENODEV; 794 } 795 796 switch (hp->dxfer_direction) { 797 case SG_DXFER_TO_FROM_DEV: 798 case SG_DXFER_FROM_DEV: 799 data_dir = DMA_FROM_DEVICE; 800 break; 801 case SG_DXFER_TO_DEV: 802 data_dir = DMA_TO_DEVICE; 803 break; 804 case SG_DXFER_UNKNOWN: 805 data_dir = DMA_BIDIRECTIONAL; 806 break; 807 default: 808 data_dir = DMA_NONE; 809 break; 810 } 811 hp->duration = jiffies_to_msecs(jiffies); 812 if (hp->interface_id != '\0' && /* v3 (or later) interface */ 813 (SG_FLAG_Q_AT_TAIL & hp->flags)) 814 at_head = 0; 815 else 816 at_head = 1; 817 818 srp->rq->timeout = timeout; 819 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 820 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 821 srp->rq, at_head, sg_rq_end_io); 822 return 0; 823} 824 825static int srp_done(Sg_fd *sfp, Sg_request *srp) 826{ 827 unsigned long flags; 828 int ret; 829 830 read_lock_irqsave(&sfp->rq_list_lock, flags); 831 ret = srp->done; 832 read_unlock_irqrestore(&sfp->rq_list_lock, flags); 833 return ret; 834} 835 836static int max_sectors_bytes(struct request_queue *q) 837{ 838 unsigned int max_sectors = queue_max_sectors(q); 839 840 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); 841 842 return max_sectors << 9; 843} 844 845static long 846sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 847{ 848 void __user *p = (void __user *)arg; 849 int __user *ip = p; 850 int result, val, read_only; 851 Sg_device *sdp; 852 Sg_fd *sfp; 853 Sg_request *srp; 854 unsigned long iflags; 855 856 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 857 return -ENXIO; 858 859 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 860 "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); 861 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 862 863 switch (cmd_in) { 864 case SG_IO: 865 if (atomic_read(&sdp->detaching)) 866 return -ENODEV; 867 if (!scsi_block_when_processing_errors(sdp->device)) 868 return -ENXIO; 869 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 870 return -EFAULT; 871 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 872 1, read_only, 1, &srp); 873 if (result < 0) 874 return result; 875 result = wait_event_interruptible(sfp->read_wait, 876 (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); 877 if (atomic_read(&sdp->detaching)) 878 return -ENODEV; 879 write_lock_irq(&sfp->rq_list_lock); 880 if (srp->done) { 881 srp->done = 2; 882 write_unlock_irq(&sfp->rq_list_lock); 883 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 884 return (result < 0) ? result : 0; 885 } 886 srp->orphan = 1; 887 write_unlock_irq(&sfp->rq_list_lock); 888 return result; /* -ERESTARTSYS because signal hit process */ 889 case SG_SET_TIMEOUT: 890 result = get_user(val, ip); 891 if (result) 892 return result; 893 if (val < 0) 894 return -EIO; 895 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 896 val = MULDIV (INT_MAX, USER_HZ, HZ); 897 sfp->timeout_user = val; 898 sfp->timeout = MULDIV (val, HZ, USER_HZ); 899 900 return 0; 901 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 902 /* strange ..., for backward compatibility */ 903 return sfp->timeout_user; 904 case SG_SET_FORCE_LOW_DMA: 905 result = get_user(val, ip); 906 if (result) 907 return result; 908 if (val) { 909 sfp->low_dma = 1; 910 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 911 val = (int) sfp->reserve.bufflen; 912 sg_remove_scat(sfp, &sfp->reserve); 913 sg_build_reserve(sfp, val); 914 } 915 } else { 916 if (atomic_read(&sdp->detaching)) 917 return -ENODEV; 918 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 919 } 920 return 0; 921 case SG_GET_LOW_DMA: 922 return put_user((int) sfp->low_dma, ip); 923 case SG_GET_SCSI_ID: 924 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 925 return -EFAULT; 926 else { 927 sg_scsi_id_t __user *sg_idp = p; 928 929 if (atomic_read(&sdp->detaching)) 930 return -ENODEV; 931 __put_user((int) sdp->device->host->host_no, 932 &sg_idp->host_no); 933 __put_user((int) sdp->device->channel, 934 &sg_idp->channel); 935 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 936 __put_user((int) sdp->device->lun, &sg_idp->lun); 937 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 938 __put_user((short) sdp->device->host->cmd_per_lun, 939 &sg_idp->h_cmd_per_lun); 940 __put_user((short) sdp->device->queue_depth, 941 &sg_idp->d_queue_depth); 942 __put_user(0, &sg_idp->unused[0]); 943 __put_user(0, &sg_idp->unused[1]); 944 return 0; 945 } 946 case SG_SET_FORCE_PACK_ID: 947 result = get_user(val, ip); 948 if (result) 949 return result; 950 sfp->force_packid = val ? 1 : 0; 951 return 0; 952 case SG_GET_PACK_ID: 953 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 954 return -EFAULT; 955 read_lock_irqsave(&sfp->rq_list_lock, iflags); 956 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 957 if ((1 == srp->done) && (!srp->sg_io_owned)) { 958 read_unlock_irqrestore(&sfp->rq_list_lock, 959 iflags); 960 __put_user(srp->header.pack_id, ip); 961 return 0; 962 } 963 } 964 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 965 __put_user(-1, ip); 966 return 0; 967 case SG_GET_NUM_WAITING: 968 read_lock_irqsave(&sfp->rq_list_lock, iflags); 969 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 970 if ((1 == srp->done) && (!srp->sg_io_owned)) 971 ++val; 972 } 973 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 974 return put_user(val, ip); 975 case SG_GET_SG_TABLESIZE: 976 return put_user(sdp->sg_tablesize, ip); 977 case SG_SET_RESERVED_SIZE: 978 result = get_user(val, ip); 979 if (result) 980 return result; 981 if (val < 0) 982 return -EINVAL; 983 val = min_t(int, val, 984 max_sectors_bytes(sdp->device->request_queue)); 985 if (val != sfp->reserve.bufflen) { 986 if (sg_res_in_use(sfp) || sfp->mmap_called) 987 return -EBUSY; 988 sg_remove_scat(sfp, &sfp->reserve); 989 sg_build_reserve(sfp, val); 990 } 991 return 0; 992 case SG_GET_RESERVED_SIZE: 993 val = min_t(int, sfp->reserve.bufflen, 994 max_sectors_bytes(sdp->device->request_queue)); 995 return put_user(val, ip); 996 case SG_SET_COMMAND_Q: 997 result = get_user(val, ip); 998 if (result) 999 return result; 1000 sfp->cmd_q = val ? 1 : 0; 1001 return 0; 1002 case SG_GET_COMMAND_Q: 1003 return put_user((int) sfp->cmd_q, ip); 1004 case SG_SET_KEEP_ORPHAN: 1005 result = get_user(val, ip); 1006 if (result) 1007 return result; 1008 sfp->keep_orphan = val; 1009 return 0; 1010 case SG_GET_KEEP_ORPHAN: 1011 return put_user((int) sfp->keep_orphan, ip); 1012 case SG_NEXT_CMD_LEN: 1013 result = get_user(val, ip); 1014 if (result) 1015 return result; 1016 sfp->next_cmd_len = (val > 0) ? val : 0; 1017 return 0; 1018 case SG_GET_VERSION_NUM: 1019 return put_user(sg_version_num, ip); 1020 case SG_GET_ACCESS_COUNT: 1021 /* faked - we don't have a real access count anymore */ 1022 val = (sdp->device ? 1 : 0); 1023 return put_user(val, ip); 1024 case SG_GET_REQUEST_TABLE: 1025 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 1026 return -EFAULT; 1027 else { 1028 sg_req_info_t *rinfo; 1029 unsigned int ms; 1030 1031 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 1032 GFP_KERNEL); 1033 if (!rinfo) 1034 return -ENOMEM; 1035 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1036 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 1037 ++val, srp = srp ? srp->nextrp : srp) { 1038 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 1039 if (srp) { 1040 rinfo[val].req_state = srp->done + 1; 1041 rinfo[val].problem = 1042 srp->header.masked_status & 1043 srp->header.host_status & 1044 srp->header.driver_status; 1045 if (srp->done) 1046 rinfo[val].duration = 1047 srp->header.duration; 1048 else { 1049 ms = jiffies_to_msecs(jiffies); 1050 rinfo[val].duration = 1051 (ms > srp->header.duration) ? 1052 (ms - srp->header.duration) : 0; 1053 } 1054 rinfo[val].orphan = srp->orphan; 1055 rinfo[val].sg_io_owned = 1056 srp->sg_io_owned; 1057 rinfo[val].pack_id = 1058 srp->header.pack_id; 1059 rinfo[val].usr_ptr = 1060 srp->header.usr_ptr; 1061 } 1062 } 1063 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1064 result = __copy_to_user(p, rinfo, 1065 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1066 result = result ? -EFAULT : 0; 1067 kfree(rinfo); 1068 return result; 1069 } 1070 case SG_EMULATED_HOST: 1071 if (atomic_read(&sdp->detaching)) 1072 return -ENODEV; 1073 return put_user(sdp->device->host->hostt->emulated, ip); 1074 case SG_SCSI_RESET: 1075 if (atomic_read(&sdp->detaching)) 1076 return -ENODEV; 1077 if (filp->f_flags & O_NONBLOCK) { 1078 if (scsi_host_in_recovery(sdp->device->host)) 1079 return -EBUSY; 1080 } else if (!scsi_block_when_processing_errors(sdp->device)) 1081 return -EBUSY; 1082 result = get_user(val, ip); 1083 if (result) 1084 return result; 1085 if (SG_SCSI_RESET_NOTHING == val) 1086 return 0; 1087 switch (val) { 1088 case SG_SCSI_RESET_DEVICE: 1089 val = SCSI_TRY_RESET_DEVICE; 1090 break; 1091 case SG_SCSI_RESET_TARGET: 1092 val = SCSI_TRY_RESET_TARGET; 1093 break; 1094 case SG_SCSI_RESET_BUS: 1095 val = SCSI_TRY_RESET_BUS; 1096 break; 1097 case SG_SCSI_RESET_HOST: 1098 val = SCSI_TRY_RESET_HOST; 1099 break; 1100 default: 1101 return -EINVAL; 1102 } 1103 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1104 return -EACCES; 1105 return (scsi_reset_provider(sdp->device, val) == 1106 SUCCESS) ? 0 : -EIO; 1107 case SCSI_IOCTL_SEND_COMMAND: 1108 if (atomic_read(&sdp->detaching)) 1109 return -ENODEV; 1110 if (read_only) { 1111 unsigned char opcode = WRITE_6; 1112 Scsi_Ioctl_Command __user *siocp = p; 1113 1114 if (copy_from_user(&opcode, siocp->data, 1)) 1115 return -EFAULT; 1116 if (sg_allow_access(filp, &opcode)) 1117 return -EPERM; 1118 } 1119 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1120 case SG_SET_DEBUG: 1121 result = get_user(val, ip); 1122 if (result) 1123 return result; 1124 sdp->sgdebug = (char) val; 1125 return 0; 1126 case SCSI_IOCTL_GET_IDLUN: 1127 case SCSI_IOCTL_GET_BUS_NUMBER: 1128 case SCSI_IOCTL_PROBE_HOST: 1129 case SG_GET_TRANSFORM: 1130 if (atomic_read(&sdp->detaching)) 1131 return -ENODEV; 1132 return scsi_ioctl(sdp->device, cmd_in, p); 1133 case BLKSECTGET: 1134 return put_user(max_sectors_bytes(sdp->device->request_queue), 1135 ip); 1136 case BLKTRACESETUP: 1137 return blk_trace_setup(sdp->device->request_queue, 1138 sdp->disk->disk_name, 1139 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1140 NULL, 1141 (char *)arg); 1142 case BLKTRACESTART: 1143 return blk_trace_startstop(sdp->device->request_queue, 1); 1144 case BLKTRACESTOP: 1145 return blk_trace_startstop(sdp->device->request_queue, 0); 1146 case BLKTRACETEARDOWN: 1147 return blk_trace_remove(sdp->device->request_queue); 1148 default: 1149 if (read_only) 1150 return -EPERM; /* don't know so take safe approach */ 1151 return scsi_ioctl(sdp->device, cmd_in, p); 1152 } 1153} 1154 1155#ifdef CONFIG_COMPAT 1156static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1157{ 1158 Sg_device *sdp; 1159 Sg_fd *sfp; 1160 struct scsi_device *sdev; 1161 1162 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1163 return -ENXIO; 1164 1165 sdev = sdp->device; 1166 if (sdev->host->hostt->compat_ioctl) { 1167 int ret; 1168 1169 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1170 1171 return ret; 1172 } 1173 1174 return -ENOIOCTLCMD; 1175} 1176#endif 1177 1178static unsigned int 1179sg_poll(struct file *filp, poll_table * wait) 1180{ 1181 unsigned int res = 0; 1182 Sg_device *sdp; 1183 Sg_fd *sfp; 1184 Sg_request *srp; 1185 int count = 0; 1186 unsigned long iflags; 1187 1188 sfp = filp->private_data; 1189 if (!sfp) 1190 return POLLERR; 1191 sdp = sfp->parentdp; 1192 if (!sdp) 1193 return POLLERR; 1194 poll_wait(filp, &sfp->read_wait, wait); 1195 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1196 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1197 /* if any read waiting, flag it */ 1198 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1199 res = POLLIN | POLLRDNORM; 1200 ++count; 1201 } 1202 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1203 1204 if (atomic_read(&sdp->detaching)) 1205 res |= POLLHUP; 1206 else if (!sfp->cmd_q) { 1207 if (0 == count) 1208 res |= POLLOUT | POLLWRNORM; 1209 } else if (count < SG_MAX_QUEUE) 1210 res |= POLLOUT | POLLWRNORM; 1211 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1212 "sg_poll: res=0x%x\n", (int) res)); 1213 return res; 1214} 1215 1216static int 1217sg_fasync(int fd, struct file *filp, int mode) 1218{ 1219 Sg_device *sdp; 1220 Sg_fd *sfp; 1221 1222 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1223 return -ENXIO; 1224 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1225 "sg_fasync: mode=%d\n", mode)); 1226 1227 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1228} 1229 1230static int 1231sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1232{ 1233 Sg_fd *sfp; 1234 unsigned long offset, len, sa; 1235 Sg_scatter_hold *rsv_schp; 1236 int k, length; 1237 1238 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1239 return VM_FAULT_SIGBUS; 1240 rsv_schp = &sfp->reserve; 1241 offset = vmf->pgoff << PAGE_SHIFT; 1242 if (offset >= rsv_schp->bufflen) 1243 return VM_FAULT_SIGBUS; 1244 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, 1245 "sg_vma_fault: offset=%lu, scatg=%d\n", 1246 offset, rsv_schp->k_use_sg)); 1247 sa = vma->vm_start; 1248 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1249 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1250 len = vma->vm_end - sa; 1251 len = (len < length) ? len : length; 1252 if (offset < len) { 1253 struct page *page = nth_page(rsv_schp->pages[k], 1254 offset >> PAGE_SHIFT); 1255 get_page(page); /* increment page count */ 1256 vmf->page = page; 1257 return 0; /* success */ 1258 } 1259 sa += len; 1260 offset -= len; 1261 } 1262 1263 return VM_FAULT_SIGBUS; 1264} 1265 1266static const struct vm_operations_struct sg_mmap_vm_ops = { 1267 .fault = sg_vma_fault, 1268}; 1269 1270static int 1271sg_mmap(struct file *filp, struct vm_area_struct *vma) 1272{ 1273 Sg_fd *sfp; 1274 unsigned long req_sz, len, sa; 1275 Sg_scatter_hold *rsv_schp; 1276 int k, length; 1277 1278 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1279 return -ENXIO; 1280 req_sz = vma->vm_end - vma->vm_start; 1281 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, 1282 "sg_mmap starting, vm_start=%p, len=%d\n", 1283 (void *) vma->vm_start, (int) req_sz)); 1284 if (vma->vm_pgoff) 1285 return -EINVAL; /* want no offset */ 1286 rsv_schp = &sfp->reserve; 1287 if (req_sz > rsv_schp->bufflen) 1288 return -ENOMEM; /* cannot map more than reserved buffer */ 1289 1290 sa = vma->vm_start; 1291 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1292 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1293 len = vma->vm_end - sa; 1294 len = (len < length) ? len : length; 1295 sa += len; 1296 } 1297 1298 sfp->mmap_called = 1; 1299 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 1300 vma->vm_private_data = sfp; 1301 vma->vm_ops = &sg_mmap_vm_ops; 1302 return 0; 1303} 1304 1305static void 1306sg_rq_end_io_usercontext(struct work_struct *work) 1307{ 1308 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1309 struct sg_fd *sfp = srp->parentfp; 1310 1311 sg_finish_rem_req(srp); 1312 kref_put(&sfp->f_ref, sg_remove_sfp); 1313} 1314 1315/* 1316 * This function is a "bottom half" handler that is called by the mid 1317 * level when a command is completed (or has failed). 1318 */ 1319static void 1320sg_rq_end_io(struct request *rq, int uptodate) 1321{ 1322 struct sg_request *srp = rq->end_io_data; 1323 Sg_device *sdp; 1324 Sg_fd *sfp; 1325 unsigned long iflags; 1326 unsigned int ms; 1327 char *sense; 1328 int result, resid, done = 1; 1329 1330 if (WARN_ON(srp->done != 0)) 1331 return; 1332 1333 sfp = srp->parentfp; 1334 if (WARN_ON(sfp == NULL)) 1335 return; 1336 1337 sdp = sfp->parentdp; 1338 if (unlikely(atomic_read(&sdp->detaching))) 1339 pr_info("%s: device detaching\n", __func__); 1340 1341 sense = rq->sense; 1342 result = rq->errors; 1343 resid = rq->resid_len; 1344 1345 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, 1346 "sg_cmd_done: pack_id=%d, res=0x%x\n", 1347 srp->header.pack_id, result)); 1348 srp->header.resid = resid; 1349 ms = jiffies_to_msecs(jiffies); 1350 srp->header.duration = (ms > srp->header.duration) ? 1351 (ms - srp->header.duration) : 0; 1352 if (0 != result) { 1353 struct scsi_sense_hdr sshdr; 1354 1355 srp->header.status = 0xff & result; 1356 srp->header.masked_status = status_byte(result); 1357 srp->header.msg_status = msg_byte(result); 1358 srp->header.host_status = host_byte(result); 1359 srp->header.driver_status = driver_byte(result); 1360 if ((sdp->sgdebug > 0) && 1361 ((CHECK_CONDITION == srp->header.masked_status) || 1362 (COMMAND_TERMINATED == srp->header.masked_status))) 1363 __scsi_print_sense(__func__, sense, 1364 SCSI_SENSE_BUFFERSIZE); 1365 1366 /* Following if statement is a patch supplied by Eric Youngdale */ 1367 if (driver_byte(result) != 0 1368 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1369 && !scsi_sense_is_deferred(&sshdr) 1370 && sshdr.sense_key == UNIT_ATTENTION 1371 && sdp->device->removable) { 1372 /* Detected possible disc change. Set the bit - this */ 1373 /* may be used if there are filesystems using this device */ 1374 sdp->device->changed = 1; 1375 } 1376 } 1377 /* Rely on write phase to clean out srp status values, so no "else" */ 1378 1379 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1380 if (unlikely(srp->orphan)) { 1381 if (sfp->keep_orphan) 1382 srp->sg_io_owned = 0; 1383 else 1384 done = 0; 1385 } 1386 srp->done = done; 1387 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1388 1389 if (likely(done)) { 1390 /* Now wake up any sg_read() that is waiting for this 1391 * packet. 1392 */ 1393 wake_up_interruptible(&sfp->read_wait); 1394 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1395 kref_put(&sfp->f_ref, sg_remove_sfp); 1396 } else { 1397 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1398 schedule_work(&srp->ew.work); 1399 } 1400} 1401 1402static const struct file_operations sg_fops = { 1403 .owner = THIS_MODULE, 1404 .read = sg_read, 1405 .write = sg_write, 1406 .poll = sg_poll, 1407 .unlocked_ioctl = sg_ioctl, 1408#ifdef CONFIG_COMPAT 1409 .compat_ioctl = sg_compat_ioctl, 1410#endif 1411 .open = sg_open, 1412 .mmap = sg_mmap, 1413 .release = sg_release, 1414 .fasync = sg_fasync, 1415 .llseek = no_llseek, 1416}; 1417 1418static struct class *sg_sysfs_class; 1419 1420static int sg_sysfs_valid = 0; 1421 1422static Sg_device * 1423sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1424{ 1425 struct request_queue *q = scsidp->request_queue; 1426 Sg_device *sdp; 1427 unsigned long iflags; 1428 int error; 1429 u32 k; 1430 1431 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1432 if (!sdp) { 1433 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " 1434 "failure\n", __func__); 1435 return ERR_PTR(-ENOMEM); 1436 } 1437 1438 idr_preload(GFP_KERNEL); 1439 write_lock_irqsave(&sg_index_lock, iflags); 1440 1441 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); 1442 if (error < 0) { 1443 if (error == -ENOSPC) { 1444 sdev_printk(KERN_WARNING, scsidp, 1445 "Unable to attach sg device type=%d, minor number exceeds %d\n", 1446 scsidp->type, SG_MAX_DEVS - 1); 1447 error = -ENODEV; 1448 } else { 1449 sdev_printk(KERN_WARNING, scsidp, "%s: idr " 1450 "allocation Sg_device failure: %d\n", 1451 __func__, error); 1452 } 1453 goto out_unlock; 1454 } 1455 k = error; 1456 1457 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, 1458 "sg_alloc: dev=%d \n", k)); 1459 sprintf(disk->disk_name, "sg%d", k); 1460 disk->first_minor = k; 1461 sdp->disk = disk; 1462 sdp->device = scsidp; 1463 mutex_init(&sdp->open_rel_lock); 1464 INIT_LIST_HEAD(&sdp->sfds); 1465 init_waitqueue_head(&sdp->open_wait); 1466 atomic_set(&sdp->detaching, 0); 1467 rwlock_init(&sdp->sfd_lock); 1468 sdp->sg_tablesize = queue_max_segments(q); 1469 sdp->index = k; 1470 kref_init(&sdp->d_ref); 1471 error = 0; 1472 1473out_unlock: 1474 write_unlock_irqrestore(&sg_index_lock, iflags); 1475 idr_preload_end(); 1476 1477 if (error) { 1478 kfree(sdp); 1479 return ERR_PTR(error); 1480 } 1481 return sdp; 1482} 1483 1484static int 1485sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) 1486{ 1487 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1488 struct gendisk *disk; 1489 Sg_device *sdp = NULL; 1490 struct cdev * cdev = NULL; 1491 int error; 1492 unsigned long iflags; 1493 1494 disk = alloc_disk(1); 1495 if (!disk) { 1496 pr_warn("%s: alloc_disk failed\n", __func__); 1497 return -ENOMEM; 1498 } 1499 disk->major = SCSI_GENERIC_MAJOR; 1500 1501 error = -ENOMEM; 1502 cdev = cdev_alloc(); 1503 if (!cdev) { 1504 pr_warn("%s: cdev_alloc failed\n", __func__); 1505 goto out; 1506 } 1507 cdev->owner = THIS_MODULE; 1508 cdev->ops = &sg_fops; 1509 1510 sdp = sg_alloc(disk, scsidp); 1511 if (IS_ERR(sdp)) { 1512 pr_warn("%s: sg_alloc failed\n", __func__); 1513 error = PTR_ERR(sdp); 1514 goto out; 1515 } 1516 1517 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1518 if (error) 1519 goto cdev_add_err; 1520 1521 sdp->cdev = cdev; 1522 if (sg_sysfs_valid) { 1523 struct device *sg_class_member; 1524 1525 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1526 MKDEV(SCSI_GENERIC_MAJOR, 1527 sdp->index), 1528 sdp, "%s", disk->disk_name); 1529 if (IS_ERR(sg_class_member)) { 1530 pr_err("%s: device_create failed\n", __func__); 1531 error = PTR_ERR(sg_class_member); 1532 goto cdev_add_err; 1533 } 1534 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1535 &sg_class_member->kobj, "generic"); 1536 if (error) 1537 pr_err("%s: unable to make symlink 'generic' back " 1538 "to sg%d\n", __func__, sdp->index); 1539 } else 1540 pr_warn("%s: sg_sys Invalid\n", __func__); 1541 1542 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " 1543 "type %d\n", sdp->index, scsidp->type); 1544 1545 dev_set_drvdata(cl_dev, sdp); 1546 1547 return 0; 1548 1549cdev_add_err: 1550 write_lock_irqsave(&sg_index_lock, iflags); 1551 idr_remove(&sg_index_idr, sdp->index); 1552 write_unlock_irqrestore(&sg_index_lock, iflags); 1553 kfree(sdp); 1554 1555out: 1556 put_disk(disk); 1557 if (cdev) 1558 cdev_del(cdev); 1559 return error; 1560} 1561 1562static void 1563sg_device_destroy(struct kref *kref) 1564{ 1565 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1566 unsigned long flags; 1567 1568 /* CAUTION! Note that the device can still be found via idr_find() 1569 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1570 * any other cleanup. 1571 */ 1572 1573 write_lock_irqsave(&sg_index_lock, flags); 1574 idr_remove(&sg_index_idr, sdp->index); 1575 write_unlock_irqrestore(&sg_index_lock, flags); 1576 1577 SCSI_LOG_TIMEOUT(3, 1578 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); 1579 1580 put_disk(sdp->disk); 1581 kfree(sdp); 1582} 1583 1584static void 1585sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) 1586{ 1587 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1588 Sg_device *sdp = dev_get_drvdata(cl_dev); 1589 unsigned long iflags; 1590 Sg_fd *sfp; 1591 int val; 1592 1593 if (!sdp) 1594 return; 1595 /* want sdp->detaching non-zero as soon as possible */ 1596 val = atomic_inc_return(&sdp->detaching); 1597 if (val > 1) 1598 return; /* only want to do following once per device */ 1599 1600 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1601 "%s\n", __func__)); 1602 1603 read_lock_irqsave(&sdp->sfd_lock, iflags); 1604 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1605 wake_up_interruptible_all(&sfp->read_wait); 1606 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1607 } 1608 wake_up_interruptible_all(&sdp->open_wait); 1609 read_unlock_irqrestore(&sdp->sfd_lock, iflags); 1610 1611 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1612 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1613 cdev_del(sdp->cdev); 1614 sdp->cdev = NULL; 1615 1616 kref_put(&sdp->d_ref, sg_device_destroy); 1617} 1618 1619module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1620module_param_named(def_reserved_size, def_reserved_size, int, 1621 S_IRUGO | S_IWUSR); 1622module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1623 1624MODULE_AUTHOR("Douglas Gilbert"); 1625MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1626MODULE_LICENSE("GPL"); 1627MODULE_VERSION(SG_VERSION_STR); 1628MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1629 1630MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1631 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1632MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1633MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1634 1635static int __init 1636init_sg(void) 1637{ 1638 int rc; 1639 1640 if (scatter_elem_sz < PAGE_SIZE) { 1641 scatter_elem_sz = PAGE_SIZE; 1642 scatter_elem_sz_prev = scatter_elem_sz; 1643 } 1644 if (def_reserved_size >= 0) 1645 sg_big_buff = def_reserved_size; 1646 else 1647 def_reserved_size = sg_big_buff; 1648 1649 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1650 SG_MAX_DEVS, "sg"); 1651 if (rc) 1652 return rc; 1653 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1654 if ( IS_ERR(sg_sysfs_class) ) { 1655 rc = PTR_ERR(sg_sysfs_class); 1656 goto err_out; 1657 } 1658 sg_sysfs_valid = 1; 1659 rc = scsi_register_interface(&sg_interface); 1660 if (0 == rc) { 1661#ifdef CONFIG_SCSI_PROC_FS 1662 sg_proc_init(); 1663#endif /* CONFIG_SCSI_PROC_FS */ 1664 return 0; 1665 } 1666 class_destroy(sg_sysfs_class); 1667err_out: 1668 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1669 return rc; 1670} 1671 1672static void __exit 1673exit_sg(void) 1674{ 1675#ifdef CONFIG_SCSI_PROC_FS 1676 sg_proc_cleanup(); 1677#endif /* CONFIG_SCSI_PROC_FS */ 1678 scsi_unregister_interface(&sg_interface); 1679 class_destroy(sg_sysfs_class); 1680 sg_sysfs_valid = 0; 1681 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1682 SG_MAX_DEVS); 1683 idr_destroy(&sg_index_idr); 1684} 1685 1686static int 1687sg_start_req(Sg_request *srp, unsigned char *cmd) 1688{ 1689 int res; 1690 struct request *rq; 1691 Sg_fd *sfp = srp->parentfp; 1692 sg_io_hdr_t *hp = &srp->header; 1693 int dxfer_len = (int) hp->dxfer_len; 1694 int dxfer_dir = hp->dxfer_direction; 1695 unsigned int iov_count = hp->iovec_count; 1696 Sg_scatter_hold *req_schp = &srp->data; 1697 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1698 struct request_queue *q = sfp->parentdp->device->request_queue; 1699 struct rq_map_data *md, map_data; 1700 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1701 unsigned char *long_cmdp = NULL; 1702 1703 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1704 "sg_start_req: dxfer_len=%d\n", 1705 dxfer_len)); 1706 1707 if (hp->cmd_len > BLK_MAX_CDB) { 1708 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); 1709 if (!long_cmdp) 1710 return -ENOMEM; 1711 } 1712 1713 rq = blk_get_request(q, rw, GFP_ATOMIC); 1714 if (IS_ERR(rq)) { 1715 kfree(long_cmdp); 1716 return PTR_ERR(rq); 1717 } 1718 1719 blk_rq_set_block_pc(rq); 1720 1721 if (hp->cmd_len > BLK_MAX_CDB) 1722 rq->cmd = long_cmdp; 1723 memcpy(rq->cmd, cmd, hp->cmd_len); 1724 rq->cmd_len = hp->cmd_len; 1725 1726 srp->rq = rq; 1727 rq->end_io_data = srp; 1728 rq->sense = srp->sense_b; 1729 rq->retries = SG_DEFAULT_RETRIES; 1730 1731 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1732 return 0; 1733 1734 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1735 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1736 !sfp->parentdp->device->host->unchecked_isa_dma && 1737 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1738 md = NULL; 1739 else 1740 md = &map_data; 1741 1742 if (md) { 1743 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1744 sg_link_reserve(sfp, srp, dxfer_len); 1745 else { 1746 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1747 if (res) 1748 return res; 1749 } 1750 1751 md->pages = req_schp->pages; 1752 md->page_order = req_schp->page_order; 1753 md->nr_entries = req_schp->k_use_sg; 1754 md->offset = 0; 1755 md->null_mapped = hp->dxferp ? 0 : 1; 1756 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1757 md->from_user = 1; 1758 else 1759 md->from_user = 0; 1760 } 1761 1762 if (iov_count) { 1763 int len, size = sizeof(struct sg_iovec) * iov_count; 1764 struct iovec *iov; 1765 1766 iov = memdup_user(hp->dxferp, size); 1767 if (IS_ERR(iov)) 1768 return PTR_ERR(iov); 1769 1770 len = iov_length(iov, iov_count); 1771 if (hp->dxfer_len < len) { 1772 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1773 len = hp->dxfer_len; 1774 } 1775 1776 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1777 iov_count, 1778 len, GFP_ATOMIC); 1779 kfree(iov); 1780 } else 1781 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1782 hp->dxfer_len, GFP_ATOMIC); 1783 1784 if (!res) { 1785 srp->bio = rq->bio; 1786 1787 if (!md) { 1788 req_schp->dio_in_use = 1; 1789 hp->info |= SG_INFO_DIRECT_IO; 1790 } 1791 } 1792 return res; 1793} 1794 1795static int 1796sg_finish_rem_req(Sg_request *srp) 1797{ 1798 int ret = 0; 1799 1800 Sg_fd *sfp = srp->parentfp; 1801 Sg_scatter_hold *req_schp = &srp->data; 1802 1803 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1804 "sg_finish_rem_req: res_used=%d\n", 1805 (int) srp->res_used)); 1806 if (srp->rq) { 1807 if (srp->bio) 1808 ret = blk_rq_unmap_user(srp->bio); 1809 1810 if (srp->rq->cmd != srp->rq->__cmd) 1811 kfree(srp->rq->cmd); 1812 blk_put_request(srp->rq); 1813 } 1814 1815 if (srp->res_used) 1816 sg_unlink_reserve(sfp, srp); 1817 else 1818 sg_remove_scat(sfp, req_schp); 1819 1820 sg_remove_request(sfp, srp); 1821 1822 return ret; 1823} 1824 1825static int 1826sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1827{ 1828 int sg_bufflen = tablesize * sizeof(struct page *); 1829 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1830 1831 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1832 if (!schp->pages) 1833 return -ENOMEM; 1834 schp->sglist_len = sg_bufflen; 1835 return tablesize; /* number of scat_gath elements allocated */ 1836} 1837 1838static int 1839sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1840{ 1841 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1842 int sg_tablesize = sfp->parentdp->sg_tablesize; 1843 int blk_size = buff_size, order; 1844 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1845 1846 if (blk_size < 0) 1847 return -EFAULT; 1848 if (0 == blk_size) 1849 ++blk_size; /* don't know why */ 1850 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1851 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1852 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1853 "sg_build_indirect: buff_size=%d, blk_size=%d\n", 1854 buff_size, blk_size)); 1855 1856 /* N.B. ret_sz carried into this block ... */ 1857 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1858 if (mx_sc_elems < 0) 1859 return mx_sc_elems; /* most likely -ENOMEM */ 1860 1861 num = scatter_elem_sz; 1862 if (unlikely(num != scatter_elem_sz_prev)) { 1863 if (num < PAGE_SIZE) { 1864 scatter_elem_sz = PAGE_SIZE; 1865 scatter_elem_sz_prev = PAGE_SIZE; 1866 } else 1867 scatter_elem_sz_prev = num; 1868 } 1869 1870 if (sfp->low_dma) 1871 gfp_mask |= GFP_DMA; 1872 1873 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1874 gfp_mask |= __GFP_ZERO; 1875 1876 order = get_order(num); 1877retry: 1878 ret_sz = 1 << (PAGE_SHIFT + order); 1879 1880 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1881 k++, rem_sz -= ret_sz) { 1882 1883 num = (rem_sz > scatter_elem_sz_prev) ? 1884 scatter_elem_sz_prev : rem_sz; 1885 1886 schp->pages[k] = alloc_pages(gfp_mask, order); 1887 if (!schp->pages[k]) 1888 goto out; 1889 1890 if (num == scatter_elem_sz_prev) { 1891 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1892 scatter_elem_sz = ret_sz; 1893 scatter_elem_sz_prev = ret_sz; 1894 } 1895 } 1896 1897 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, 1898 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", 1899 k, num, ret_sz)); 1900 } /* end of for loop */ 1901 1902 schp->page_order = order; 1903 schp->k_use_sg = k; 1904 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, 1905 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", 1906 k, rem_sz)); 1907 1908 schp->bufflen = blk_size; 1909 if (rem_sz > 0) /* must have failed */ 1910 return -ENOMEM; 1911 return 0; 1912out: 1913 for (i = 0; i < k; i++) 1914 __free_pages(schp->pages[i], order); 1915 1916 if (--order >= 0) 1917 goto retry; 1918 1919 return -ENOMEM; 1920} 1921 1922static void 1923sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) 1924{ 1925 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1926 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1927 if (schp->pages && schp->sglist_len > 0) { 1928 if (!schp->dio_in_use) { 1929 int k; 1930 1931 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1932 SCSI_LOG_TIMEOUT(5, 1933 sg_printk(KERN_INFO, sfp->parentdp, 1934 "sg_remove_scat: k=%d, pg=0x%p\n", 1935 k, schp->pages[k])); 1936 __free_pages(schp->pages[k], schp->page_order); 1937 } 1938 1939 kfree(schp->pages); 1940 } 1941 } 1942 memset(schp, 0, sizeof (*schp)); 1943} 1944 1945static int 1946sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1947{ 1948 Sg_scatter_hold *schp = &srp->data; 1949 int k, num; 1950 1951 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, 1952 "sg_read_oxfer: num_read_xfer=%d\n", 1953 num_read_xfer)); 1954 if ((!outp) || (num_read_xfer <= 0)) 1955 return 0; 1956 1957 num = 1 << (PAGE_SHIFT + schp->page_order); 1958 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1959 if (num > num_read_xfer) { 1960 if (__copy_to_user(outp, page_address(schp->pages[k]), 1961 num_read_xfer)) 1962 return -EFAULT; 1963 break; 1964 } else { 1965 if (__copy_to_user(outp, page_address(schp->pages[k]), 1966 num)) 1967 return -EFAULT; 1968 num_read_xfer -= num; 1969 if (num_read_xfer <= 0) 1970 break; 1971 outp += num; 1972 } 1973 } 1974 1975 return 0; 1976} 1977 1978static void 1979sg_build_reserve(Sg_fd * sfp, int req_size) 1980{ 1981 Sg_scatter_hold *schp = &sfp->reserve; 1982 1983 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1984 "sg_build_reserve: req_size=%d\n", req_size)); 1985 do { 1986 if (req_size < PAGE_SIZE) 1987 req_size = PAGE_SIZE; 1988 if (0 == sg_build_indirect(schp, sfp, req_size)) 1989 return; 1990 else 1991 sg_remove_scat(sfp, schp); 1992 req_size >>= 1; /* divide by 2 */ 1993 } while (req_size > (PAGE_SIZE / 2)); 1994} 1995 1996static void 1997sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1998{ 1999 Sg_scatter_hold *req_schp = &srp->data; 2000 Sg_scatter_hold *rsv_schp = &sfp->reserve; 2001 int k, num, rem; 2002 2003 srp->res_used = 1; 2004 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 2005 "sg_link_reserve: size=%d\n", size)); 2006 rem = size; 2007 2008 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 2009 for (k = 0; k < rsv_schp->k_use_sg; k++) { 2010 if (rem <= num) { 2011 req_schp->k_use_sg = k + 1; 2012 req_schp->sglist_len = rsv_schp->sglist_len; 2013 req_schp->pages = rsv_schp->pages; 2014 2015 req_schp->bufflen = size; 2016 req_schp->page_order = rsv_schp->page_order; 2017 break; 2018 } else 2019 rem -= num; 2020 } 2021 2022 if (k >= rsv_schp->k_use_sg) 2023 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 2024 "sg_link_reserve: BAD size\n")); 2025} 2026 2027static void 2028sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2029{ 2030 Sg_scatter_hold *req_schp = &srp->data; 2031 2032 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, 2033 "sg_unlink_reserve: req->k_use_sg=%d\n", 2034 (int) req_schp->k_use_sg)); 2035 req_schp->k_use_sg = 0; 2036 req_schp->bufflen = 0; 2037 req_schp->pages = NULL; 2038 req_schp->page_order = 0; 2039 req_schp->sglist_len = 0; 2040 sfp->save_scat_len = 0; 2041 srp->res_used = 0; 2042} 2043 2044static Sg_request * 2045sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2046{ 2047 Sg_request *resp; 2048 unsigned long iflags; 2049 2050 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2051 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2052 /* look for requests that are ready + not SG_IO owned */ 2053 if ((1 == resp->done) && (!resp->sg_io_owned) && 2054 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2055 resp->done = 2; /* guard against other readers */ 2056 break; 2057 } 2058 } 2059 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2060 return resp; 2061} 2062 2063/* always adds to end of list */ 2064static Sg_request * 2065sg_add_request(Sg_fd * sfp) 2066{ 2067 int k; 2068 unsigned long iflags; 2069 Sg_request *resp; 2070 Sg_request *rp = sfp->req_arr; 2071 2072 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2073 resp = sfp->headrp; 2074 if (!resp) { 2075 memset(rp, 0, sizeof (Sg_request)); 2076 rp->parentfp = sfp; 2077 resp = rp; 2078 sfp->headrp = resp; 2079 } else { 2080 if (0 == sfp->cmd_q) 2081 resp = NULL; /* command queuing disallowed */ 2082 else { 2083 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2084 if (!rp->parentfp) 2085 break; 2086 } 2087 if (k < SG_MAX_QUEUE) { 2088 memset(rp, 0, sizeof (Sg_request)); 2089 rp->parentfp = sfp; 2090 while (resp->nextrp) 2091 resp = resp->nextrp; 2092 resp->nextrp = rp; 2093 resp = rp; 2094 } else 2095 resp = NULL; 2096 } 2097 } 2098 if (resp) { 2099 resp->nextrp = NULL; 2100 resp->header.duration = jiffies_to_msecs(jiffies); 2101 } 2102 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2103 return resp; 2104} 2105 2106/* Return of 1 for found; 0 for not found */ 2107static int 2108sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2109{ 2110 Sg_request *prev_rp; 2111 Sg_request *rp; 2112 unsigned long iflags; 2113 int res = 0; 2114 2115 if ((!sfp) || (!srp) || (!sfp->headrp)) 2116 return res; 2117 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2118 prev_rp = sfp->headrp; 2119 if (srp == prev_rp) { 2120 sfp->headrp = prev_rp->nextrp; 2121 prev_rp->parentfp = NULL; 2122 res = 1; 2123 } else { 2124 while ((rp = prev_rp->nextrp)) { 2125 if (srp == rp) { 2126 prev_rp->nextrp = rp->nextrp; 2127 rp->parentfp = NULL; 2128 res = 1; 2129 break; 2130 } 2131 prev_rp = rp; 2132 } 2133 } 2134 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2135 return res; 2136} 2137 2138static Sg_fd * 2139sg_add_sfp(Sg_device * sdp) 2140{ 2141 Sg_fd *sfp; 2142 unsigned long iflags; 2143 int bufflen; 2144 2145 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2146 if (!sfp) 2147 return ERR_PTR(-ENOMEM); 2148 2149 init_waitqueue_head(&sfp->read_wait); 2150 rwlock_init(&sfp->rq_list_lock); 2151 2152 kref_init(&sfp->f_ref); 2153 sfp->timeout = SG_DEFAULT_TIMEOUT; 2154 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2155 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2156 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2157 sdp->device->host->unchecked_isa_dma : 1; 2158 sfp->cmd_q = SG_DEF_COMMAND_Q; 2159 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2160 sfp->parentdp = sdp; 2161 write_lock_irqsave(&sdp->sfd_lock, iflags); 2162 if (atomic_read(&sdp->detaching)) { 2163 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2164 return ERR_PTR(-ENODEV); 2165 } 2166 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2167 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2168 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 2169 "sg_add_sfp: sfp=0x%p\n", sfp)); 2170 if (unlikely(sg_big_buff != def_reserved_size)) 2171 sg_big_buff = def_reserved_size; 2172 2173 bufflen = min_t(int, sg_big_buff, 2174 max_sectors_bytes(sdp->device->request_queue)); 2175 sg_build_reserve(sfp, bufflen); 2176 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 2177 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2178 sfp->reserve.bufflen, 2179 sfp->reserve.k_use_sg)); 2180 2181 kref_get(&sdp->d_ref); 2182 __module_get(THIS_MODULE); 2183 return sfp; 2184} 2185 2186static void 2187sg_remove_sfp_usercontext(struct work_struct *work) 2188{ 2189 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2190 struct sg_device *sdp = sfp->parentdp; 2191 2192 /* Cleanup any responses which were never read(). */ 2193 while (sfp->headrp) 2194 sg_finish_rem_req(sfp->headrp); 2195 2196 if (sfp->reserve.bufflen > 0) { 2197 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, 2198 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2199 (int) sfp->reserve.bufflen, 2200 (int) sfp->reserve.k_use_sg)); 2201 sg_remove_scat(sfp, &sfp->reserve); 2202 } 2203 2204 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, 2205 "sg_remove_sfp: sfp=0x%p\n", sfp)); 2206 kfree(sfp); 2207 2208 scsi_device_put(sdp->device); 2209 kref_put(&sdp->d_ref, sg_device_destroy); 2210 module_put(THIS_MODULE); 2211} 2212 2213static void 2214sg_remove_sfp(struct kref *kref) 2215{ 2216 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2217 struct sg_device *sdp = sfp->parentdp; 2218 unsigned long iflags; 2219 2220 write_lock_irqsave(&sdp->sfd_lock, iflags); 2221 list_del(&sfp->sfd_siblings); 2222 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2223 2224 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2225 schedule_work(&sfp->ew.work); 2226} 2227 2228static int 2229sg_res_in_use(Sg_fd * sfp) 2230{ 2231 const Sg_request *srp; 2232 unsigned long iflags; 2233 2234 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2235 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2236 if (srp->res_used) 2237 break; 2238 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2239 return srp ? 1 : 0; 2240} 2241 2242#ifdef CONFIG_SCSI_PROC_FS 2243static int 2244sg_idr_max_id(int id, void *p, void *data) 2245{ 2246 int *k = data; 2247 2248 if (*k < id) 2249 *k = id; 2250 2251 return 0; 2252} 2253 2254static int 2255sg_last_dev(void) 2256{ 2257 int k = -1; 2258 unsigned long iflags; 2259 2260 read_lock_irqsave(&sg_index_lock, iflags); 2261 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2262 read_unlock_irqrestore(&sg_index_lock, iflags); 2263 return k + 1; /* origin 1 */ 2264} 2265#endif 2266 2267/* must be called with sg_index_lock held */ 2268static Sg_device *sg_lookup_dev(int dev) 2269{ 2270 return idr_find(&sg_index_idr, dev); 2271} 2272 2273static Sg_device * 2274sg_get_dev(int dev) 2275{ 2276 struct sg_device *sdp; 2277 unsigned long flags; 2278 2279 read_lock_irqsave(&sg_index_lock, flags); 2280 sdp = sg_lookup_dev(dev); 2281 if (!sdp) 2282 sdp = ERR_PTR(-ENXIO); 2283 else if (atomic_read(&sdp->detaching)) { 2284 /* If sdp->detaching, then the refcount may already be 0, in 2285 * which case it would be a bug to do kref_get(). 2286 */ 2287 sdp = ERR_PTR(-ENODEV); 2288 } else 2289 kref_get(&sdp->d_ref); 2290 read_unlock_irqrestore(&sg_index_lock, flags); 2291 2292 return sdp; 2293} 2294 2295#ifdef CONFIG_SCSI_PROC_FS 2296 2297static struct proc_dir_entry *sg_proc_sgp = NULL; 2298 2299static char sg_proc_sg_dirname[] = "scsi/sg"; 2300 2301static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2302 2303static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2304static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2305 size_t count, loff_t *off); 2306static const struct file_operations adio_fops = { 2307 .owner = THIS_MODULE, 2308 .open = sg_proc_single_open_adio, 2309 .read = seq_read, 2310 .llseek = seq_lseek, 2311 .write = sg_proc_write_adio, 2312 .release = single_release, 2313}; 2314 2315static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2316static ssize_t sg_proc_write_dressz(struct file *filp, 2317 const char __user *buffer, size_t count, loff_t *off); 2318static const struct file_operations dressz_fops = { 2319 .owner = THIS_MODULE, 2320 .open = sg_proc_single_open_dressz, 2321 .read = seq_read, 2322 .llseek = seq_lseek, 2323 .write = sg_proc_write_dressz, 2324 .release = single_release, 2325}; 2326 2327static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2328static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2329static const struct file_operations version_fops = { 2330 .owner = THIS_MODULE, 2331 .open = sg_proc_single_open_version, 2332 .read = seq_read, 2333 .llseek = seq_lseek, 2334 .release = single_release, 2335}; 2336 2337static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2338static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2339static const struct file_operations devhdr_fops = { 2340 .owner = THIS_MODULE, 2341 .open = sg_proc_single_open_devhdr, 2342 .read = seq_read, 2343 .llseek = seq_lseek, 2344 .release = single_release, 2345}; 2346 2347static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2348static int sg_proc_open_dev(struct inode *inode, struct file *file); 2349static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2350static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2351static void dev_seq_stop(struct seq_file *s, void *v); 2352static const struct file_operations dev_fops = { 2353 .owner = THIS_MODULE, 2354 .open = sg_proc_open_dev, 2355 .read = seq_read, 2356 .llseek = seq_lseek, 2357 .release = seq_release, 2358}; 2359static const struct seq_operations dev_seq_ops = { 2360 .start = dev_seq_start, 2361 .next = dev_seq_next, 2362 .stop = dev_seq_stop, 2363 .show = sg_proc_seq_show_dev, 2364}; 2365 2366static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2367static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2368static const struct file_operations devstrs_fops = { 2369 .owner = THIS_MODULE, 2370 .open = sg_proc_open_devstrs, 2371 .read = seq_read, 2372 .llseek = seq_lseek, 2373 .release = seq_release, 2374}; 2375static const struct seq_operations devstrs_seq_ops = { 2376 .start = dev_seq_start, 2377 .next = dev_seq_next, 2378 .stop = dev_seq_stop, 2379 .show = sg_proc_seq_show_devstrs, 2380}; 2381 2382static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2383static int sg_proc_open_debug(struct inode *inode, struct file *file); 2384static const struct file_operations debug_fops = { 2385 .owner = THIS_MODULE, 2386 .open = sg_proc_open_debug, 2387 .read = seq_read, 2388 .llseek = seq_lseek, 2389 .release = seq_release, 2390}; 2391static const struct seq_operations debug_seq_ops = { 2392 .start = dev_seq_start, 2393 .next = dev_seq_next, 2394 .stop = dev_seq_stop, 2395 .show = sg_proc_seq_show_debug, 2396}; 2397 2398 2399struct sg_proc_leaf { 2400 const char * name; 2401 const struct file_operations * fops; 2402}; 2403 2404static const struct sg_proc_leaf sg_proc_leaf_arr[] = { 2405 {"allow_dio", &adio_fops}, 2406 {"debug", &debug_fops}, 2407 {"def_reserved_size", &dressz_fops}, 2408 {"device_hdr", &devhdr_fops}, 2409 {"devices", &dev_fops}, 2410 {"device_strs", &devstrs_fops}, 2411 {"version", &version_fops} 2412}; 2413 2414static int 2415sg_proc_init(void) 2416{ 2417 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2418 int k; 2419 2420 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2421 if (!sg_proc_sgp) 2422 return 1; 2423 for (k = 0; k < num_leaves; ++k) { 2424 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2425 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2426 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2427 } 2428 return 0; 2429} 2430 2431static void 2432sg_proc_cleanup(void) 2433{ 2434 int k; 2435 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2436 2437 if (!sg_proc_sgp) 2438 return; 2439 for (k = 0; k < num_leaves; ++k) 2440 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2441 remove_proc_entry(sg_proc_sg_dirname, NULL); 2442} 2443 2444 2445static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2446{ 2447 seq_printf(s, "%d\n", *((int *)s->private)); 2448 return 0; 2449} 2450 2451static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2452{ 2453 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2454} 2455 2456static ssize_t 2457sg_proc_write_adio(struct file *filp, const char __user *buffer, 2458 size_t count, loff_t *off) 2459{ 2460 int err; 2461 unsigned long num; 2462 2463 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2464 return -EACCES; 2465 err = kstrtoul_from_user(buffer, count, 0, &num); 2466 if (err) 2467 return err; 2468 sg_allow_dio = num ? 1 : 0; 2469 return count; 2470} 2471 2472static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2473{ 2474 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2475} 2476 2477static ssize_t 2478sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2479 size_t count, loff_t *off) 2480{ 2481 int err; 2482 unsigned long k = ULONG_MAX; 2483 2484 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2485 return -EACCES; 2486 2487 err = kstrtoul_from_user(buffer, count, 0, &k); 2488 if (err) 2489 return err; 2490 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2491 sg_big_buff = k; 2492 return count; 2493 } 2494 return -ERANGE; 2495} 2496 2497static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2498{ 2499 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2500 sg_version_date); 2501 return 0; 2502} 2503 2504static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2505{ 2506 return single_open(file, sg_proc_seq_show_version, NULL); 2507} 2508 2509static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2510{ 2511 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); 2512 return 0; 2513} 2514 2515static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2516{ 2517 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2518} 2519 2520struct sg_proc_deviter { 2521 loff_t index; 2522 size_t max; 2523}; 2524 2525static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2526{ 2527 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2528 2529 s->private = it; 2530 if (! it) 2531 return NULL; 2532 2533 it->index = *pos; 2534 it->max = sg_last_dev(); 2535 if (it->index >= it->max) 2536 return NULL; 2537 return it; 2538} 2539 2540static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2541{ 2542 struct sg_proc_deviter * it = s->private; 2543 2544 *pos = ++it->index; 2545 return (it->index < it->max) ? it : NULL; 2546} 2547 2548static void dev_seq_stop(struct seq_file *s, void *v) 2549{ 2550 kfree(s->private); 2551} 2552 2553static int sg_proc_open_dev(struct inode *inode, struct file *file) 2554{ 2555 return seq_open(file, &dev_seq_ops); 2556} 2557 2558static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2559{ 2560 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2561 Sg_device *sdp; 2562 struct scsi_device *scsidp; 2563 unsigned long iflags; 2564 2565 read_lock_irqsave(&sg_index_lock, iflags); 2566 sdp = it ? sg_lookup_dev(it->index) : NULL; 2567 if ((NULL == sdp) || (NULL == sdp->device) || 2568 (atomic_read(&sdp->detaching))) 2569 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2570 else { 2571 scsidp = sdp->device; 2572 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", 2573 scsidp->host->host_no, scsidp->channel, 2574 scsidp->id, scsidp->lun, (int) scsidp->type, 2575 1, 2576 (int) scsidp->queue_depth, 2577 (int) atomic_read(&scsidp->device_busy), 2578 (int) scsi_device_online(scsidp)); 2579 } 2580 read_unlock_irqrestore(&sg_index_lock, iflags); 2581 return 0; 2582} 2583 2584static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2585{ 2586 return seq_open(file, &devstrs_seq_ops); 2587} 2588 2589static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2590{ 2591 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2592 Sg_device *sdp; 2593 struct scsi_device *scsidp; 2594 unsigned long iflags; 2595 2596 read_lock_irqsave(&sg_index_lock, iflags); 2597 sdp = it ? sg_lookup_dev(it->index) : NULL; 2598 scsidp = sdp ? sdp->device : NULL; 2599 if (sdp && scsidp && (!atomic_read(&sdp->detaching))) 2600 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2601 scsidp->vendor, scsidp->model, scsidp->rev); 2602 else 2603 seq_puts(s, "<no active device>\n"); 2604 read_unlock_irqrestore(&sg_index_lock, iflags); 2605 return 0; 2606} 2607 2608/* must be called while holding sg_index_lock */ 2609static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2610{ 2611 int k, m, new_interface, blen, usg; 2612 Sg_request *srp; 2613 Sg_fd *fp; 2614 const sg_io_hdr_t *hp; 2615 const char * cp; 2616 unsigned int ms; 2617 2618 k = 0; 2619 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2620 k++; 2621 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2622 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2623 "(res)sgat=%d low_dma=%d\n", k, 2624 jiffies_to_msecs(fp->timeout), 2625 fp->reserve.bufflen, 2626 (int) fp->reserve.k_use_sg, 2627 (int) fp->low_dma); 2628 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", 2629 (int) fp->cmd_q, (int) fp->force_packid, 2630 (int) fp->keep_orphan); 2631 for (m = 0, srp = fp->headrp; 2632 srp != NULL; 2633 ++m, srp = srp->nextrp) { 2634 hp = &srp->header; 2635 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2636 if (srp->res_used) { 2637 if (new_interface && 2638 (SG_FLAG_MMAP_IO & hp->flags)) 2639 cp = " mmap>> "; 2640 else 2641 cp = " rb>> "; 2642 } else { 2643 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2644 cp = " dio>> "; 2645 else 2646 cp = " "; 2647 } 2648 seq_puts(s, cp); 2649 blen = srp->data.bufflen; 2650 usg = srp->data.k_use_sg; 2651 seq_puts(s, srp->done ? 2652 ((1 == srp->done) ? "rcv:" : "fin:") 2653 : "act:"); 2654 seq_printf(s, " id=%d blen=%d", 2655 srp->header.pack_id, blen); 2656 if (srp->done) 2657 seq_printf(s, " dur=%d", hp->duration); 2658 else { 2659 ms = jiffies_to_msecs(jiffies); 2660 seq_printf(s, " t_o/elap=%d/%d", 2661 (new_interface ? hp->timeout : 2662 jiffies_to_msecs(fp->timeout)), 2663 (ms > hp->duration ? ms - hp->duration : 0)); 2664 } 2665 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2666 (int) srp->data.cmd_opcode); 2667 } 2668 if (0 == m) 2669 seq_puts(s, " No requests active\n"); 2670 read_unlock(&fp->rq_list_lock); 2671 } 2672} 2673 2674static int sg_proc_open_debug(struct inode *inode, struct file *file) 2675{ 2676 return seq_open(file, &debug_seq_ops); 2677} 2678 2679static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2680{ 2681 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2682 Sg_device *sdp; 2683 unsigned long iflags; 2684 2685 if (it && (0 == it->index)) 2686 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", 2687 (int)it->max, sg_big_buff); 2688 2689 read_lock_irqsave(&sg_index_lock, iflags); 2690 sdp = it ? sg_lookup_dev(it->index) : NULL; 2691 if (NULL == sdp) 2692 goto skip; 2693 read_lock(&sdp->sfd_lock); 2694 if (!list_empty(&sdp->sfds)) { 2695 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2696 if (atomic_read(&sdp->detaching)) 2697 seq_puts(s, "detaching pending close "); 2698 else if (sdp->device) { 2699 struct scsi_device *scsidp = sdp->device; 2700 2701 seq_printf(s, "%d:%d:%d:%llu em=%d", 2702 scsidp->host->host_no, 2703 scsidp->channel, scsidp->id, 2704 scsidp->lun, 2705 scsidp->host->hostt->emulated); 2706 } 2707 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", 2708 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); 2709 sg_proc_debug_helper(s, sdp); 2710 } 2711 read_unlock(&sdp->sfd_lock); 2712skip: 2713 read_unlock_irqrestore(&sg_index_lock, iflags); 2714 return 0; 2715} 2716 2717#endif /* CONFIG_SCSI_PROC_FS */ 2718 2719module_init(init_sg); 2720module_exit(exit_sg); 2721