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 19 static 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/errno.h> 37 #include <linux/mtio.h> 38 #include <linux/ioctl.h> 39 #include <linux/slab.h> 40 #include <linux/fcntl.h> 41 #include <linux/init.h> 42 #include <linux/poll.h> 43 #include <linux/moduleparam.h> 44 #include <linux/cdev.h> 45 #include <linux/idr.h> 46 #include <linux/seq_file.h> 47 #include <linux/blkdev.h> 48 #include <linux/delay.h> 49 #include <linux/blktrace_api.h> 50 #include <linux/mutex.h> 51 #include <linux/atomic.h> 52 #include <linux/ratelimit.h> 53 #include <linux/uio.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> 66 static char *sg_version_date = "20140603"; 67 68 static int sg_proc_init(void); 69 static 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 #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 83 84 int sg_big_buff = SG_DEF_RESERVED_SIZE; 85 /* N.B. This variable is readable and writeable via 86 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 87 of this size (or less if there is not enough memory) will be reserved 88 for use by this file descriptor. [Deprecated usage: this variable is also 89 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 90 the kernel (i.e. it is not a module).] */ 91 static int def_reserved_size = -1; /* picks up init parameter */ 92 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 93 94 static int scatter_elem_sz = SG_SCATTER_SZ; 95 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 96 97 #define SG_SECTOR_SZ 512 98 99 static int sg_add_device(struct device *, struct class_interface *); 100 static void sg_remove_device(struct device *, struct class_interface *); 101 102 static DEFINE_IDR(sg_index_idr); 103 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 104 file descriptor list for device */ 105 106 static struct class_interface sg_interface = { 107 .add_dev = sg_add_device, 108 .remove_dev = sg_remove_device, 109 }; 110 111 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 112 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 113 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 114 unsigned bufflen; /* Size of (aggregate) data buffer */ 115 struct page **pages; 116 int page_order; 117 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 118 unsigned char cmd_opcode; /* first byte of command */ 119 } Sg_scatter_hold; 120 121 struct sg_device; /* forward declarations */ 122 struct sg_fd; 123 124 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 125 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 126 struct sg_fd *parentfp; /* NULL -> not in use */ 127 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 128 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 129 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 130 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 131 char orphan; /* 1 -> drop on sight, 0 -> normal */ 132 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 133 /* done protected by rq_list_lock */ 134 char done; /* 0->before bh, 1->before read, 2->read */ 135 struct request *rq; 136 struct bio *bio; 137 struct execute_work ew; 138 } Sg_request; 139 140 typedef struct sg_fd { /* holds the state of a file descriptor */ 141 struct list_head sfd_siblings; /* protected by device's sfd_lock */ 142 struct sg_device *parentdp; /* owning device */ 143 wait_queue_head_t read_wait; /* queue read until command done */ 144 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 148 unsigned save_scat_len; /* original length of trunc. scat. element */ 149 Sg_request *headrp; /* head of request slist, NULL->empty */ 150 struct fasync_struct *async_qp; /* used by asynchronous notification */ 151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 152 char low_dma; /* as in parent but possibly overridden to 1 */ 153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 154 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 155 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ 156 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 157 char mmap_called; /* 0 -> mmap() never called on this fd */ 158 struct kref f_ref; 159 struct execute_work ew; 160 } Sg_fd; 161 162 typedef struct sg_device { /* holds the state of each scsi generic device */ 163 struct scsi_device *device; 164 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ 165 struct mutex open_rel_lock; /* held when in open() or release() */ 166 int sg_tablesize; /* adapter's max scatter-gather table size */ 167 u32 index; /* device index number */ 168 struct list_head sfds; 169 rwlock_t sfd_lock; /* protect access to sfd list */ 170 atomic_t detaching; /* 0->device usable, 1->device detaching */ 171 bool exclude; /* 1->open(O_EXCL) succeeded and is active */ 172 int open_cnt; /* count of opens (perhaps < num(sfds) ) */ 173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 174 struct gendisk *disk; 175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 176 struct kref d_ref; 177 } Sg_device; 178 179 /* tasklet or soft irq callback */ 180 static void sg_rq_end_io(struct request *rq, int uptodate); 181 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 182 static int sg_finish_rem_req(Sg_request * srp); 183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 185 Sg_request * srp); 186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 187 const char __user *buf, size_t count, int blocking, 188 int read_only, int sg_io_owned, Sg_request **o_srp); 189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 190 unsigned char *cmnd, int timeout, int blocking); 191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 192 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); 193 static void sg_build_reserve(Sg_fd * sfp, int req_size); 194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 196 static Sg_fd *sg_add_sfp(Sg_device * sdp); 197 static void sg_remove_sfp(struct kref *); 198 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 199 static Sg_request *sg_add_request(Sg_fd * sfp); 200 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 201 static int sg_res_in_use(Sg_fd * sfp); 202 static Sg_device *sg_get_dev(int dev); 203 static void sg_device_destroy(struct kref *kref); 204 205 #define SZ_SG_HEADER sizeof(struct sg_header) 206 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 207 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 208 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 209 210 #define sg_printk(prefix, sdp, fmt, a...) \ 211 sdev_prefix_printk(prefix, (sdp)->device, \ 212 (sdp)->disk->disk_name, fmt, ##a) 213 214 static int sg_allow_access(struct file *filp, unsigned char *cmd) 215 { 216 struct sg_fd *sfp = filp->private_data; 217 218 if (sfp->parentdp->device->type == TYPE_SCANNER) 219 return 0; 220 221 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 222 } 223 224 static int 225 open_wait(Sg_device *sdp, int flags) 226 { 227 int retval = 0; 228 229 if (flags & O_EXCL) { 230 while (sdp->open_cnt > 0) { 231 mutex_unlock(&sdp->open_rel_lock); 232 retval = wait_event_interruptible(sdp->open_wait, 233 (atomic_read(&sdp->detaching) || 234 !sdp->open_cnt)); 235 mutex_lock(&sdp->open_rel_lock); 236 237 if (retval) /* -ERESTARTSYS */ 238 return retval; 239 if (atomic_read(&sdp->detaching)) 240 return -ENODEV; 241 } 242 } else { 243 while (sdp->exclude) { 244 mutex_unlock(&sdp->open_rel_lock); 245 retval = wait_event_interruptible(sdp->open_wait, 246 (atomic_read(&sdp->detaching) || 247 !sdp->exclude)); 248 mutex_lock(&sdp->open_rel_lock); 249 250 if (retval) /* -ERESTARTSYS */ 251 return retval; 252 if (atomic_read(&sdp->detaching)) 253 return -ENODEV; 254 } 255 } 256 257 return retval; 258 } 259 260 /* Returns 0 on success, else a negated errno value */ 261 static int 262 sg_open(struct inode *inode, struct file *filp) 263 { 264 int dev = iminor(inode); 265 int flags = filp->f_flags; 266 struct request_queue *q; 267 Sg_device *sdp; 268 Sg_fd *sfp; 269 int retval; 270 271 nonseekable_open(inode, filp); 272 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) 273 return -EPERM; /* Can't lock it with read only access */ 274 sdp = sg_get_dev(dev); 275 if (IS_ERR(sdp)) 276 return PTR_ERR(sdp); 277 278 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 279 "sg_open: flags=0x%x\n", flags)); 280 281 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 282 /* Prevent the device driver from vanishing while we sleep */ 283 retval = scsi_device_get(sdp->device); 284 if (retval) 285 goto sg_put; 286 287 retval = scsi_autopm_get_device(sdp->device); 288 if (retval) 289 goto sdp_put; 290 291 /* scsi_block_when_processing_errors() may block so bypass 292 * check if O_NONBLOCK. Permits SCSI commands to be issued 293 * during error recovery. Tread carefully. */ 294 if (!((flags & O_NONBLOCK) || 295 scsi_block_when_processing_errors(sdp->device))) { 296 retval = -ENXIO; 297 /* we are in error recovery for this device */ 298 goto error_out; 299 } 300 301 mutex_lock(&sdp->open_rel_lock); 302 if (flags & O_NONBLOCK) { 303 if (flags & O_EXCL) { 304 if (sdp->open_cnt > 0) { 305 retval = -EBUSY; 306 goto error_mutex_locked; 307 } 308 } else { 309 if (sdp->exclude) { 310 retval = -EBUSY; 311 goto error_mutex_locked; 312 } 313 } 314 } else { 315 retval = open_wait(sdp, flags); 316 if (retval) /* -ERESTARTSYS or -ENODEV */ 317 goto error_mutex_locked; 318 } 319 320 /* N.B. at this point we are holding the open_rel_lock */ 321 if (flags & O_EXCL) 322 sdp->exclude = true; 323 324 if (sdp->open_cnt < 1) { /* no existing opens */ 325 sdp->sgdebug = 0; 326 q = sdp->device->request_queue; 327 sdp->sg_tablesize = queue_max_segments(q); 328 } 329 sfp = sg_add_sfp(sdp); 330 if (IS_ERR(sfp)) { 331 retval = PTR_ERR(sfp); 332 goto out_undo; 333 } 334 335 filp->private_data = sfp; 336 sdp->open_cnt++; 337 mutex_unlock(&sdp->open_rel_lock); 338 339 retval = 0; 340 sg_put: 341 kref_put(&sdp->d_ref, sg_device_destroy); 342 return retval; 343 344 out_undo: 345 if (flags & O_EXCL) { 346 sdp->exclude = false; /* undo if error */ 347 wake_up_interruptible(&sdp->open_wait); 348 } 349 error_mutex_locked: 350 mutex_unlock(&sdp->open_rel_lock); 351 error_out: 352 scsi_autopm_put_device(sdp->device); 353 sdp_put: 354 scsi_device_put(sdp->device); 355 goto sg_put; 356 } 357 358 /* Release resources associated with a successful sg_open() 359 * Returns 0 on success, else a negated errno value */ 360 static int 361 sg_release(struct inode *inode, struct file *filp) 362 { 363 Sg_device *sdp; 364 Sg_fd *sfp; 365 366 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 367 return -ENXIO; 368 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); 369 370 mutex_lock(&sdp->open_rel_lock); 371 scsi_autopm_put_device(sdp->device); 372 kref_put(&sfp->f_ref, sg_remove_sfp); 373 sdp->open_cnt--; 374 375 /* possibly many open()s waiting on exlude clearing, start many; 376 * only open(O_EXCL)s wait on 0==open_cnt so only start one */ 377 if (sdp->exclude) { 378 sdp->exclude = false; 379 wake_up_interruptible_all(&sdp->open_wait); 380 } else if (0 == sdp->open_cnt) { 381 wake_up_interruptible(&sdp->open_wait); 382 } 383 mutex_unlock(&sdp->open_rel_lock); 384 return 0; 385 } 386 387 static ssize_t 388 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 389 { 390 Sg_device *sdp; 391 Sg_fd *sfp; 392 Sg_request *srp; 393 int req_pack_id = -1; 394 sg_io_hdr_t *hp; 395 struct sg_header *old_hdr = NULL; 396 int retval = 0; 397 398 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 399 return -ENXIO; 400 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 401 "sg_read: count=%d\n", (int) count)); 402 403 if (!access_ok(VERIFY_WRITE, buf, count)) 404 return -EFAULT; 405 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 406 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 407 if (!old_hdr) 408 return -ENOMEM; 409 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 410 retval = -EFAULT; 411 goto free_old_hdr; 412 } 413 if (old_hdr->reply_len < 0) { 414 if (count >= SZ_SG_IO_HDR) { 415 sg_io_hdr_t *new_hdr; 416 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 417 if (!new_hdr) { 418 retval = -ENOMEM; 419 goto free_old_hdr; 420 } 421 retval =__copy_from_user 422 (new_hdr, buf, SZ_SG_IO_HDR); 423 req_pack_id = new_hdr->pack_id; 424 kfree(new_hdr); 425 if (retval) { 426 retval = -EFAULT; 427 goto free_old_hdr; 428 } 429 } 430 } else 431 req_pack_id = old_hdr->pack_id; 432 } 433 srp = sg_get_rq_mark(sfp, req_pack_id); 434 if (!srp) { /* now wait on packet to arrive */ 435 if (atomic_read(&sdp->detaching)) { 436 retval = -ENODEV; 437 goto free_old_hdr; 438 } 439 if (filp->f_flags & O_NONBLOCK) { 440 retval = -EAGAIN; 441 goto free_old_hdr; 442 } 443 retval = wait_event_interruptible(sfp->read_wait, 444 (atomic_read(&sdp->detaching) || 445 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 446 if (atomic_read(&sdp->detaching)) { 447 retval = -ENODEV; 448 goto free_old_hdr; 449 } 450 if (retval) { 451 /* -ERESTARTSYS as signal hit process */ 452 goto free_old_hdr; 453 } 454 } 455 if (srp->header.interface_id != '\0') { 456 retval = sg_new_read(sfp, buf, count, srp); 457 goto free_old_hdr; 458 } 459 460 hp = &srp->header; 461 if (old_hdr == NULL) { 462 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 463 if (! old_hdr) { 464 retval = -ENOMEM; 465 goto free_old_hdr; 466 } 467 } 468 memset(old_hdr, 0, SZ_SG_HEADER); 469 old_hdr->reply_len = (int) hp->timeout; 470 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 471 old_hdr->pack_id = hp->pack_id; 472 old_hdr->twelve_byte = 473 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 474 old_hdr->target_status = hp->masked_status; 475 old_hdr->host_status = hp->host_status; 476 old_hdr->driver_status = hp->driver_status; 477 if ((CHECK_CONDITION & hp->masked_status) || 478 (DRIVER_SENSE & hp->driver_status)) 479 memcpy(old_hdr->sense_buffer, srp->sense_b, 480 sizeof (old_hdr->sense_buffer)); 481 switch (hp->host_status) { 482 /* This setup of 'result' is for backward compatibility and is best 483 ignored by the user who should use target, host + driver status */ 484 case DID_OK: 485 case DID_PASSTHROUGH: 486 case DID_SOFT_ERROR: 487 old_hdr->result = 0; 488 break; 489 case DID_NO_CONNECT: 490 case DID_BUS_BUSY: 491 case DID_TIME_OUT: 492 old_hdr->result = EBUSY; 493 break; 494 case DID_BAD_TARGET: 495 case DID_ABORT: 496 case DID_PARITY: 497 case DID_RESET: 498 case DID_BAD_INTR: 499 old_hdr->result = EIO; 500 break; 501 case DID_ERROR: 502 old_hdr->result = (srp->sense_b[0] == 0 && 503 hp->masked_status == GOOD) ? 0 : EIO; 504 break; 505 default: 506 old_hdr->result = EIO; 507 break; 508 } 509 510 /* Now copy the result back to the user buffer. */ 511 if (count >= SZ_SG_HEADER) { 512 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 513 retval = -EFAULT; 514 goto free_old_hdr; 515 } 516 buf += SZ_SG_HEADER; 517 if (count > old_hdr->reply_len) 518 count = old_hdr->reply_len; 519 if (count > SZ_SG_HEADER) { 520 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 521 retval = -EFAULT; 522 goto free_old_hdr; 523 } 524 } 525 } else 526 count = (old_hdr->result == 0) ? 0 : -EIO; 527 sg_finish_rem_req(srp); 528 retval = count; 529 free_old_hdr: 530 kfree(old_hdr); 531 return retval; 532 } 533 534 static ssize_t 535 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 536 { 537 sg_io_hdr_t *hp = &srp->header; 538 int err = 0, err2; 539 int len; 540 541 if (count < SZ_SG_IO_HDR) { 542 err = -EINVAL; 543 goto err_out; 544 } 545 hp->sb_len_wr = 0; 546 if ((hp->mx_sb_len > 0) && hp->sbp) { 547 if ((CHECK_CONDITION & hp->masked_status) || 548 (DRIVER_SENSE & hp->driver_status)) { 549 int sb_len = SCSI_SENSE_BUFFERSIZE; 550 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 551 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 552 len = (len > sb_len) ? sb_len : len; 553 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 554 err = -EFAULT; 555 goto err_out; 556 } 557 hp->sb_len_wr = len; 558 } 559 } 560 if (hp->masked_status || hp->host_status || hp->driver_status) 561 hp->info |= SG_INFO_CHECK; 562 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 563 err = -EFAULT; 564 goto err_out; 565 } 566 err_out: 567 err2 = sg_finish_rem_req(srp); 568 return err ? : err2 ? : count; 569 } 570 571 static ssize_t 572 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 573 { 574 int mxsize, cmd_size, k; 575 int input_size, blocking; 576 unsigned char opcode; 577 Sg_device *sdp; 578 Sg_fd *sfp; 579 Sg_request *srp; 580 struct sg_header old_hdr; 581 sg_io_hdr_t *hp; 582 unsigned char cmnd[SG_MAX_CDB_SIZE]; 583 584 if (unlikely(segment_eq(get_fs(), KERNEL_DS))) 585 return -EINVAL; 586 587 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 588 return -ENXIO; 589 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 590 "sg_write: count=%d\n", (int) count)); 591 if (atomic_read(&sdp->detaching)) 592 return -ENODEV; 593 if (!((filp->f_flags & O_NONBLOCK) || 594 scsi_block_when_processing_errors(sdp->device))) 595 return -ENXIO; 596 597 if (!access_ok(VERIFY_READ, buf, count)) 598 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 599 if (count < SZ_SG_HEADER) 600 return -EIO; 601 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 602 return -EFAULT; 603 blocking = !(filp->f_flags & O_NONBLOCK); 604 if (old_hdr.reply_len < 0) 605 return sg_new_write(sfp, filp, buf, count, 606 blocking, 0, 0, NULL); 607 if (count < (SZ_SG_HEADER + 6)) 608 return -EIO; /* The minimum scsi command length is 6 bytes. */ 609 610 if (!(srp = sg_add_request(sfp))) { 611 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, 612 "sg_write: queue full\n")); 613 return -EDOM; 614 } 615 buf += SZ_SG_HEADER; 616 __get_user(opcode, buf); 617 if (sfp->next_cmd_len > 0) { 618 cmd_size = sfp->next_cmd_len; 619 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 620 } else { 621 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 622 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 623 cmd_size = 12; 624 } 625 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, 626 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 627 /* Determine buffer size. */ 628 input_size = count - cmd_size; 629 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 630 mxsize -= SZ_SG_HEADER; 631 input_size -= SZ_SG_HEADER; 632 if (input_size < 0) { 633 sg_remove_request(sfp, srp); 634 return -EIO; /* User did not pass enough bytes for this command. */ 635 } 636 hp = &srp->header; 637 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 638 hp->cmd_len = (unsigned char) cmd_size; 639 hp->iovec_count = 0; 640 hp->mx_sb_len = 0; 641 if (input_size > 0) 642 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 643 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 644 else 645 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 646 hp->dxfer_len = mxsize; 647 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) || 648 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)) 649 hp->dxferp = (char __user *)buf + cmd_size; 650 else 651 hp->dxferp = NULL; 652 hp->sbp = NULL; 653 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 654 hp->flags = input_size; /* structure abuse ... */ 655 hp->pack_id = old_hdr.pack_id; 656 hp->usr_ptr = NULL; 657 if (__copy_from_user(cmnd, buf, cmd_size)) 658 return -EFAULT; 659 /* 660 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 661 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 662 * is a non-zero input_size, so emit a warning. 663 */ 664 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 665 static char cmd[TASK_COMM_LEN]; 666 if (strcmp(current->comm, cmd)) { 667 printk_ratelimited(KERN_WARNING 668 "sg_write: data in/out %d/%d bytes " 669 "for SCSI command 0x%x-- guessing " 670 "data in;\n program %s not setting " 671 "count and/or reply_len properly\n", 672 old_hdr.reply_len - (int)SZ_SG_HEADER, 673 input_size, (unsigned int) cmnd[0], 674 current->comm); 675 strcpy(cmd, current->comm); 676 } 677 } 678 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 679 return (k < 0) ? k : count; 680 } 681 682 static ssize_t 683 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 684 size_t count, int blocking, int read_only, int sg_io_owned, 685 Sg_request **o_srp) 686 { 687 int k; 688 Sg_request *srp; 689 sg_io_hdr_t *hp; 690 unsigned char cmnd[SG_MAX_CDB_SIZE]; 691 int timeout; 692 unsigned long ul_timeout; 693 694 if (count < SZ_SG_IO_HDR) 695 return -EINVAL; 696 if (!access_ok(VERIFY_READ, buf, count)) 697 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 698 699 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 700 if (!(srp = sg_add_request(sfp))) { 701 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 702 "sg_new_write: queue full\n")); 703 return -EDOM; 704 } 705 srp->sg_io_owned = sg_io_owned; 706 hp = &srp->header; 707 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 708 sg_remove_request(sfp, srp); 709 return -EFAULT; 710 } 711 if (hp->interface_id != 'S') { 712 sg_remove_request(sfp, srp); 713 return -ENOSYS; 714 } 715 if (hp->flags & SG_FLAG_MMAP_IO) { 716 if (hp->dxfer_len > sfp->reserve.bufflen) { 717 sg_remove_request(sfp, srp); 718 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 719 } 720 if (hp->flags & SG_FLAG_DIRECT_IO) { 721 sg_remove_request(sfp, srp); 722 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 723 } 724 if (sg_res_in_use(sfp)) { 725 sg_remove_request(sfp, srp); 726 return -EBUSY; /* reserve buffer already being used */ 727 } 728 } 729 ul_timeout = msecs_to_jiffies(srp->header.timeout); 730 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 731 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 732 sg_remove_request(sfp, srp); 733 return -EMSGSIZE; 734 } 735 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 736 sg_remove_request(sfp, srp); 737 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 738 } 739 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 740 sg_remove_request(sfp, srp); 741 return -EFAULT; 742 } 743 if (read_only && sg_allow_access(file, cmnd)) { 744 sg_remove_request(sfp, srp); 745 return -EPERM; 746 } 747 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 748 if (k < 0) 749 return k; 750 if (o_srp) 751 *o_srp = srp; 752 return count; 753 } 754 755 static int 756 sg_common_write(Sg_fd * sfp, Sg_request * srp, 757 unsigned char *cmnd, int timeout, int blocking) 758 { 759 int k, at_head; 760 Sg_device *sdp = sfp->parentdp; 761 sg_io_hdr_t *hp = &srp->header; 762 763 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 764 hp->status = 0; 765 hp->masked_status = 0; 766 hp->msg_status = 0; 767 hp->info = 0; 768 hp->host_status = 0; 769 hp->driver_status = 0; 770 hp->resid = 0; 771 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 772 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 773 (int) cmnd[0], (int) hp->cmd_len)); 774 775 k = sg_start_req(srp, cmnd); 776 if (k) { 777 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 778 "sg_common_write: start_req err=%d\n", k)); 779 sg_finish_rem_req(srp); 780 return k; /* probably out of space --> ENOMEM */ 781 } 782 if (atomic_read(&sdp->detaching)) { 783 if (srp->bio) { 784 if (srp->rq->cmd != srp->rq->__cmd) 785 kfree(srp->rq->cmd); 786 787 blk_end_request_all(srp->rq, -EIO); 788 srp->rq = NULL; 789 } 790 791 sg_finish_rem_req(srp); 792 return -ENODEV; 793 } 794 795 hp->duration = jiffies_to_msecs(jiffies); 796 if (hp->interface_id != '\0' && /* v3 (or later) interface */ 797 (SG_FLAG_Q_AT_TAIL & hp->flags)) 798 at_head = 0; 799 else 800 at_head = 1; 801 802 srp->rq->timeout = timeout; 803 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 804 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 805 srp->rq, at_head, sg_rq_end_io); 806 return 0; 807 } 808 809 static int srp_done(Sg_fd *sfp, Sg_request *srp) 810 { 811 unsigned long flags; 812 int ret; 813 814 read_lock_irqsave(&sfp->rq_list_lock, flags); 815 ret = srp->done; 816 read_unlock_irqrestore(&sfp->rq_list_lock, flags); 817 return ret; 818 } 819 820 static int max_sectors_bytes(struct request_queue *q) 821 { 822 unsigned int max_sectors = queue_max_sectors(q); 823 824 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); 825 826 return max_sectors << 9; 827 } 828 829 static long 830 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 831 { 832 void __user *p = (void __user *)arg; 833 int __user *ip = p; 834 int result, val, read_only; 835 Sg_device *sdp; 836 Sg_fd *sfp; 837 Sg_request *srp; 838 unsigned long iflags; 839 840 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 841 return -ENXIO; 842 843 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 844 "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); 845 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 846 847 switch (cmd_in) { 848 case SG_IO: 849 if (atomic_read(&sdp->detaching)) 850 return -ENODEV; 851 if (!scsi_block_when_processing_errors(sdp->device)) 852 return -ENXIO; 853 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 854 return -EFAULT; 855 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 856 1, read_only, 1, &srp); 857 if (result < 0) 858 return result; 859 result = wait_event_interruptible(sfp->read_wait, 860 (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); 861 if (atomic_read(&sdp->detaching)) 862 return -ENODEV; 863 write_lock_irq(&sfp->rq_list_lock); 864 if (srp->done) { 865 srp->done = 2; 866 write_unlock_irq(&sfp->rq_list_lock); 867 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 868 return (result < 0) ? result : 0; 869 } 870 srp->orphan = 1; 871 write_unlock_irq(&sfp->rq_list_lock); 872 return result; /* -ERESTARTSYS because signal hit process */ 873 case SG_SET_TIMEOUT: 874 result = get_user(val, ip); 875 if (result) 876 return result; 877 if (val < 0) 878 return -EIO; 879 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) 880 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ), 881 INT_MAX); 882 sfp->timeout_user = val; 883 sfp->timeout = mult_frac(val, HZ, USER_HZ); 884 885 return 0; 886 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 887 /* strange ..., for backward compatibility */ 888 return sfp->timeout_user; 889 case SG_SET_FORCE_LOW_DMA: 890 result = get_user(val, ip); 891 if (result) 892 return result; 893 if (val) { 894 sfp->low_dma = 1; 895 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 896 val = (int) sfp->reserve.bufflen; 897 sg_remove_scat(sfp, &sfp->reserve); 898 sg_build_reserve(sfp, val); 899 } 900 } else { 901 if (atomic_read(&sdp->detaching)) 902 return -ENODEV; 903 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 904 } 905 return 0; 906 case SG_GET_LOW_DMA: 907 return put_user((int) sfp->low_dma, ip); 908 case SG_GET_SCSI_ID: 909 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 910 return -EFAULT; 911 else { 912 sg_scsi_id_t __user *sg_idp = p; 913 914 if (atomic_read(&sdp->detaching)) 915 return -ENODEV; 916 __put_user((int) sdp->device->host->host_no, 917 &sg_idp->host_no); 918 __put_user((int) sdp->device->channel, 919 &sg_idp->channel); 920 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 921 __put_user((int) sdp->device->lun, &sg_idp->lun); 922 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 923 __put_user((short) sdp->device->host->cmd_per_lun, 924 &sg_idp->h_cmd_per_lun); 925 __put_user((short) sdp->device->queue_depth, 926 &sg_idp->d_queue_depth); 927 __put_user(0, &sg_idp->unused[0]); 928 __put_user(0, &sg_idp->unused[1]); 929 return 0; 930 } 931 case SG_SET_FORCE_PACK_ID: 932 result = get_user(val, ip); 933 if (result) 934 return result; 935 sfp->force_packid = val ? 1 : 0; 936 return 0; 937 case SG_GET_PACK_ID: 938 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 939 return -EFAULT; 940 read_lock_irqsave(&sfp->rq_list_lock, iflags); 941 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 942 if ((1 == srp->done) && (!srp->sg_io_owned)) { 943 read_unlock_irqrestore(&sfp->rq_list_lock, 944 iflags); 945 __put_user(srp->header.pack_id, ip); 946 return 0; 947 } 948 } 949 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 950 __put_user(-1, ip); 951 return 0; 952 case SG_GET_NUM_WAITING: 953 read_lock_irqsave(&sfp->rq_list_lock, iflags); 954 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 955 if ((1 == srp->done) && (!srp->sg_io_owned)) 956 ++val; 957 } 958 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 959 return put_user(val, ip); 960 case SG_GET_SG_TABLESIZE: 961 return put_user(sdp->sg_tablesize, ip); 962 case SG_SET_RESERVED_SIZE: 963 result = get_user(val, ip); 964 if (result) 965 return result; 966 if (val < 0) 967 return -EINVAL; 968 val = min_t(int, val, 969 max_sectors_bytes(sdp->device->request_queue)); 970 if (val != sfp->reserve.bufflen) { 971 if (sg_res_in_use(sfp) || sfp->mmap_called) 972 return -EBUSY; 973 sg_remove_scat(sfp, &sfp->reserve); 974 sg_build_reserve(sfp, val); 975 } 976 return 0; 977 case SG_GET_RESERVED_SIZE: 978 val = min_t(int, sfp->reserve.bufflen, 979 max_sectors_bytes(sdp->device->request_queue)); 980 return put_user(val, ip); 981 case SG_SET_COMMAND_Q: 982 result = get_user(val, ip); 983 if (result) 984 return result; 985 sfp->cmd_q = val ? 1 : 0; 986 return 0; 987 case SG_GET_COMMAND_Q: 988 return put_user((int) sfp->cmd_q, ip); 989 case SG_SET_KEEP_ORPHAN: 990 result = get_user(val, ip); 991 if (result) 992 return result; 993 sfp->keep_orphan = val; 994 return 0; 995 case SG_GET_KEEP_ORPHAN: 996 return put_user((int) sfp->keep_orphan, ip); 997 case SG_NEXT_CMD_LEN: 998 result = get_user(val, ip); 999 if (result) 1000 return result; 1001 sfp->next_cmd_len = (val > 0) ? val : 0; 1002 return 0; 1003 case SG_GET_VERSION_NUM: 1004 return put_user(sg_version_num, ip); 1005 case SG_GET_ACCESS_COUNT: 1006 /* faked - we don't have a real access count anymore */ 1007 val = (sdp->device ? 1 : 0); 1008 return put_user(val, ip); 1009 case SG_GET_REQUEST_TABLE: 1010 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 1011 return -EFAULT; 1012 else { 1013 sg_req_info_t *rinfo; 1014 unsigned int ms; 1015 1016 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 1017 GFP_KERNEL); 1018 if (!rinfo) 1019 return -ENOMEM; 1020 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1021 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 1022 ++val, srp = srp ? srp->nextrp : srp) { 1023 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 1024 if (srp) { 1025 rinfo[val].req_state = srp->done + 1; 1026 rinfo[val].problem = 1027 srp->header.masked_status & 1028 srp->header.host_status & 1029 srp->header.driver_status; 1030 if (srp->done) 1031 rinfo[val].duration = 1032 srp->header.duration; 1033 else { 1034 ms = jiffies_to_msecs(jiffies); 1035 rinfo[val].duration = 1036 (ms > srp->header.duration) ? 1037 (ms - srp->header.duration) : 0; 1038 } 1039 rinfo[val].orphan = srp->orphan; 1040 rinfo[val].sg_io_owned = 1041 srp->sg_io_owned; 1042 rinfo[val].pack_id = 1043 srp->header.pack_id; 1044 rinfo[val].usr_ptr = 1045 srp->header.usr_ptr; 1046 } 1047 } 1048 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1049 result = __copy_to_user(p, rinfo, 1050 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1051 result = result ? -EFAULT : 0; 1052 kfree(rinfo); 1053 return result; 1054 } 1055 case SG_EMULATED_HOST: 1056 if (atomic_read(&sdp->detaching)) 1057 return -ENODEV; 1058 return put_user(sdp->device->host->hostt->emulated, ip); 1059 case SCSI_IOCTL_SEND_COMMAND: 1060 if (atomic_read(&sdp->detaching)) 1061 return -ENODEV; 1062 if (read_only) { 1063 unsigned char opcode = WRITE_6; 1064 Scsi_Ioctl_Command __user *siocp = p; 1065 1066 if (copy_from_user(&opcode, siocp->data, 1)) 1067 return -EFAULT; 1068 if (sg_allow_access(filp, &opcode)) 1069 return -EPERM; 1070 } 1071 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1072 case SG_SET_DEBUG: 1073 result = get_user(val, ip); 1074 if (result) 1075 return result; 1076 sdp->sgdebug = (char) val; 1077 return 0; 1078 case BLKSECTGET: 1079 return put_user(max_sectors_bytes(sdp->device->request_queue), 1080 ip); 1081 case BLKTRACESETUP: 1082 return blk_trace_setup(sdp->device->request_queue, 1083 sdp->disk->disk_name, 1084 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1085 NULL, 1086 (char *)arg); 1087 case BLKTRACESTART: 1088 return blk_trace_startstop(sdp->device->request_queue, 1); 1089 case BLKTRACESTOP: 1090 return blk_trace_startstop(sdp->device->request_queue, 0); 1091 case BLKTRACETEARDOWN: 1092 return blk_trace_remove(sdp->device->request_queue); 1093 case SCSI_IOCTL_GET_IDLUN: 1094 case SCSI_IOCTL_GET_BUS_NUMBER: 1095 case SCSI_IOCTL_PROBE_HOST: 1096 case SG_GET_TRANSFORM: 1097 case SG_SCSI_RESET: 1098 if (atomic_read(&sdp->detaching)) 1099 return -ENODEV; 1100 break; 1101 default: 1102 if (read_only) 1103 return -EPERM; /* don't know so take safe approach */ 1104 break; 1105 } 1106 1107 result = scsi_ioctl_block_when_processing_errors(sdp->device, 1108 cmd_in, filp->f_flags & O_NDELAY); 1109 if (result) 1110 return result; 1111 return scsi_ioctl(sdp->device, cmd_in, p); 1112 } 1113 1114 #ifdef CONFIG_COMPAT 1115 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1116 { 1117 Sg_device *sdp; 1118 Sg_fd *sfp; 1119 struct scsi_device *sdev; 1120 1121 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1122 return -ENXIO; 1123 1124 sdev = sdp->device; 1125 if (sdev->host->hostt->compat_ioctl) { 1126 int ret; 1127 1128 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1129 1130 return ret; 1131 } 1132 1133 return -ENOIOCTLCMD; 1134 } 1135 #endif 1136 1137 static unsigned int 1138 sg_poll(struct file *filp, poll_table * wait) 1139 { 1140 unsigned int res = 0; 1141 Sg_device *sdp; 1142 Sg_fd *sfp; 1143 Sg_request *srp; 1144 int count = 0; 1145 unsigned long iflags; 1146 1147 sfp = filp->private_data; 1148 if (!sfp) 1149 return POLLERR; 1150 sdp = sfp->parentdp; 1151 if (!sdp) 1152 return POLLERR; 1153 poll_wait(filp, &sfp->read_wait, wait); 1154 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1155 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1156 /* if any read waiting, flag it */ 1157 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1158 res = POLLIN | POLLRDNORM; 1159 ++count; 1160 } 1161 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1162 1163 if (atomic_read(&sdp->detaching)) 1164 res |= POLLHUP; 1165 else if (!sfp->cmd_q) { 1166 if (0 == count) 1167 res |= POLLOUT | POLLWRNORM; 1168 } else if (count < SG_MAX_QUEUE) 1169 res |= POLLOUT | POLLWRNORM; 1170 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1171 "sg_poll: res=0x%x\n", (int) res)); 1172 return res; 1173 } 1174 1175 static int 1176 sg_fasync(int fd, struct file *filp, int mode) 1177 { 1178 Sg_device *sdp; 1179 Sg_fd *sfp; 1180 1181 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1182 return -ENXIO; 1183 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1184 "sg_fasync: mode=%d\n", mode)); 1185 1186 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1187 } 1188 1189 static int 1190 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1191 { 1192 Sg_fd *sfp; 1193 unsigned long offset, len, sa; 1194 Sg_scatter_hold *rsv_schp; 1195 int k, length; 1196 1197 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1198 return VM_FAULT_SIGBUS; 1199 rsv_schp = &sfp->reserve; 1200 offset = vmf->pgoff << PAGE_SHIFT; 1201 if (offset >= rsv_schp->bufflen) 1202 return VM_FAULT_SIGBUS; 1203 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, 1204 "sg_vma_fault: offset=%lu, scatg=%d\n", 1205 offset, rsv_schp->k_use_sg)); 1206 sa = vma->vm_start; 1207 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1208 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1209 len = vma->vm_end - sa; 1210 len = (len < length) ? len : length; 1211 if (offset < len) { 1212 struct page *page = nth_page(rsv_schp->pages[k], 1213 offset >> PAGE_SHIFT); 1214 get_page(page); /* increment page count */ 1215 vmf->page = page; 1216 return 0; /* success */ 1217 } 1218 sa += len; 1219 offset -= len; 1220 } 1221 1222 return VM_FAULT_SIGBUS; 1223 } 1224 1225 static const struct vm_operations_struct sg_mmap_vm_ops = { 1226 .fault = sg_vma_fault, 1227 }; 1228 1229 static int 1230 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1231 { 1232 Sg_fd *sfp; 1233 unsigned long req_sz, len, sa; 1234 Sg_scatter_hold *rsv_schp; 1235 int k, length; 1236 1237 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1238 return -ENXIO; 1239 req_sz = vma->vm_end - vma->vm_start; 1240 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, 1241 "sg_mmap starting, vm_start=%p, len=%d\n", 1242 (void *) vma->vm_start, (int) req_sz)); 1243 if (vma->vm_pgoff) 1244 return -EINVAL; /* want no offset */ 1245 rsv_schp = &sfp->reserve; 1246 if (req_sz > rsv_schp->bufflen) 1247 return -ENOMEM; /* cannot map more than reserved buffer */ 1248 1249 sa = vma->vm_start; 1250 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1251 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1252 len = vma->vm_end - sa; 1253 len = (len < length) ? len : length; 1254 sa += len; 1255 } 1256 1257 sfp->mmap_called = 1; 1258 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 1259 vma->vm_private_data = sfp; 1260 vma->vm_ops = &sg_mmap_vm_ops; 1261 return 0; 1262 } 1263 1264 static void 1265 sg_rq_end_io_usercontext(struct work_struct *work) 1266 { 1267 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1268 struct sg_fd *sfp = srp->parentfp; 1269 1270 sg_finish_rem_req(srp); 1271 kref_put(&sfp->f_ref, sg_remove_sfp); 1272 } 1273 1274 /* 1275 * This function is a "bottom half" handler that is called by the mid 1276 * level when a command is completed (or has failed). 1277 */ 1278 static void 1279 sg_rq_end_io(struct request *rq, int uptodate) 1280 { 1281 struct sg_request *srp = rq->end_io_data; 1282 Sg_device *sdp; 1283 Sg_fd *sfp; 1284 unsigned long iflags; 1285 unsigned int ms; 1286 char *sense; 1287 int result, resid, done = 1; 1288 1289 if (WARN_ON(srp->done != 0)) 1290 return; 1291 1292 sfp = srp->parentfp; 1293 if (WARN_ON(sfp == NULL)) 1294 return; 1295 1296 sdp = sfp->parentdp; 1297 if (unlikely(atomic_read(&sdp->detaching))) 1298 pr_info("%s: device detaching\n", __func__); 1299 1300 sense = rq->sense; 1301 result = rq->errors; 1302 resid = rq->resid_len; 1303 1304 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, 1305 "sg_cmd_done: pack_id=%d, res=0x%x\n", 1306 srp->header.pack_id, result)); 1307 srp->header.resid = resid; 1308 ms = jiffies_to_msecs(jiffies); 1309 srp->header.duration = (ms > srp->header.duration) ? 1310 (ms - srp->header.duration) : 0; 1311 if (0 != result) { 1312 struct scsi_sense_hdr sshdr; 1313 1314 srp->header.status = 0xff & result; 1315 srp->header.masked_status = status_byte(result); 1316 srp->header.msg_status = msg_byte(result); 1317 srp->header.host_status = host_byte(result); 1318 srp->header.driver_status = driver_byte(result); 1319 if ((sdp->sgdebug > 0) && 1320 ((CHECK_CONDITION == srp->header.masked_status) || 1321 (COMMAND_TERMINATED == srp->header.masked_status))) 1322 __scsi_print_sense(sdp->device, __func__, sense, 1323 SCSI_SENSE_BUFFERSIZE); 1324 1325 /* Following if statement is a patch supplied by Eric Youngdale */ 1326 if (driver_byte(result) != 0 1327 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1328 && !scsi_sense_is_deferred(&sshdr) 1329 && sshdr.sense_key == UNIT_ATTENTION 1330 && sdp->device->removable) { 1331 /* Detected possible disc change. Set the bit - this */ 1332 /* may be used if there are filesystems using this device */ 1333 sdp->device->changed = 1; 1334 } 1335 } 1336 /* Rely on write phase to clean out srp status values, so no "else" */ 1337 1338 /* 1339 * Free the request as soon as it is complete so that its resources 1340 * can be reused without waiting for userspace to read() the 1341 * result. But keep the associated bio (if any) around until 1342 * blk_rq_unmap_user() can be called from user context. 1343 */ 1344 srp->rq = NULL; 1345 if (rq->cmd != rq->__cmd) 1346 kfree(rq->cmd); 1347 __blk_put_request(rq->q, rq); 1348 1349 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1350 if (unlikely(srp->orphan)) { 1351 if (sfp->keep_orphan) 1352 srp->sg_io_owned = 0; 1353 else 1354 done = 0; 1355 } 1356 srp->done = done; 1357 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1358 1359 if (likely(done)) { 1360 /* Now wake up any sg_read() that is waiting for this 1361 * packet. 1362 */ 1363 wake_up_interruptible(&sfp->read_wait); 1364 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1365 kref_put(&sfp->f_ref, sg_remove_sfp); 1366 } else { 1367 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1368 schedule_work(&srp->ew.work); 1369 } 1370 } 1371 1372 static const struct file_operations sg_fops = { 1373 .owner = THIS_MODULE, 1374 .read = sg_read, 1375 .write = sg_write, 1376 .poll = sg_poll, 1377 .unlocked_ioctl = sg_ioctl, 1378 #ifdef CONFIG_COMPAT 1379 .compat_ioctl = sg_compat_ioctl, 1380 #endif 1381 .open = sg_open, 1382 .mmap = sg_mmap, 1383 .release = sg_release, 1384 .fasync = sg_fasync, 1385 .llseek = no_llseek, 1386 }; 1387 1388 static struct class *sg_sysfs_class; 1389 1390 static int sg_sysfs_valid = 0; 1391 1392 static Sg_device * 1393 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1394 { 1395 struct request_queue *q = scsidp->request_queue; 1396 Sg_device *sdp; 1397 unsigned long iflags; 1398 int error; 1399 u32 k; 1400 1401 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1402 if (!sdp) { 1403 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " 1404 "failure\n", __func__); 1405 return ERR_PTR(-ENOMEM); 1406 } 1407 1408 idr_preload(GFP_KERNEL); 1409 write_lock_irqsave(&sg_index_lock, iflags); 1410 1411 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); 1412 if (error < 0) { 1413 if (error == -ENOSPC) { 1414 sdev_printk(KERN_WARNING, scsidp, 1415 "Unable to attach sg device type=%d, minor number exceeds %d\n", 1416 scsidp->type, SG_MAX_DEVS - 1); 1417 error = -ENODEV; 1418 } else { 1419 sdev_printk(KERN_WARNING, scsidp, "%s: idr " 1420 "allocation Sg_device failure: %d\n", 1421 __func__, error); 1422 } 1423 goto out_unlock; 1424 } 1425 k = error; 1426 1427 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, 1428 "sg_alloc: dev=%d \n", k)); 1429 sprintf(disk->disk_name, "sg%d", k); 1430 disk->first_minor = k; 1431 sdp->disk = disk; 1432 sdp->device = scsidp; 1433 mutex_init(&sdp->open_rel_lock); 1434 INIT_LIST_HEAD(&sdp->sfds); 1435 init_waitqueue_head(&sdp->open_wait); 1436 atomic_set(&sdp->detaching, 0); 1437 rwlock_init(&sdp->sfd_lock); 1438 sdp->sg_tablesize = queue_max_segments(q); 1439 sdp->index = k; 1440 kref_init(&sdp->d_ref); 1441 error = 0; 1442 1443 out_unlock: 1444 write_unlock_irqrestore(&sg_index_lock, iflags); 1445 idr_preload_end(); 1446 1447 if (error) { 1448 kfree(sdp); 1449 return ERR_PTR(error); 1450 } 1451 return sdp; 1452 } 1453 1454 static int 1455 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) 1456 { 1457 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1458 struct gendisk *disk; 1459 Sg_device *sdp = NULL; 1460 struct cdev * cdev = NULL; 1461 int error; 1462 unsigned long iflags; 1463 1464 disk = alloc_disk(1); 1465 if (!disk) { 1466 pr_warn("%s: alloc_disk failed\n", __func__); 1467 return -ENOMEM; 1468 } 1469 disk->major = SCSI_GENERIC_MAJOR; 1470 1471 error = -ENOMEM; 1472 cdev = cdev_alloc(); 1473 if (!cdev) { 1474 pr_warn("%s: cdev_alloc failed\n", __func__); 1475 goto out; 1476 } 1477 cdev->owner = THIS_MODULE; 1478 cdev->ops = &sg_fops; 1479 1480 sdp = sg_alloc(disk, scsidp); 1481 if (IS_ERR(sdp)) { 1482 pr_warn("%s: sg_alloc failed\n", __func__); 1483 error = PTR_ERR(sdp); 1484 goto out; 1485 } 1486 1487 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1488 if (error) 1489 goto cdev_add_err; 1490 1491 sdp->cdev = cdev; 1492 if (sg_sysfs_valid) { 1493 struct device *sg_class_member; 1494 1495 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1496 MKDEV(SCSI_GENERIC_MAJOR, 1497 sdp->index), 1498 sdp, "%s", disk->disk_name); 1499 if (IS_ERR(sg_class_member)) { 1500 pr_err("%s: device_create failed\n", __func__); 1501 error = PTR_ERR(sg_class_member); 1502 goto cdev_add_err; 1503 } 1504 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1505 &sg_class_member->kobj, "generic"); 1506 if (error) 1507 pr_err("%s: unable to make symlink 'generic' back " 1508 "to sg%d\n", __func__, sdp->index); 1509 } else 1510 pr_warn("%s: sg_sys Invalid\n", __func__); 1511 1512 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " 1513 "type %d\n", sdp->index, scsidp->type); 1514 1515 dev_set_drvdata(cl_dev, sdp); 1516 1517 return 0; 1518 1519 cdev_add_err: 1520 write_lock_irqsave(&sg_index_lock, iflags); 1521 idr_remove(&sg_index_idr, sdp->index); 1522 write_unlock_irqrestore(&sg_index_lock, iflags); 1523 kfree(sdp); 1524 1525 out: 1526 put_disk(disk); 1527 if (cdev) 1528 cdev_del(cdev); 1529 return error; 1530 } 1531 1532 static void 1533 sg_device_destroy(struct kref *kref) 1534 { 1535 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1536 unsigned long flags; 1537 1538 /* CAUTION! Note that the device can still be found via idr_find() 1539 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1540 * any other cleanup. 1541 */ 1542 1543 write_lock_irqsave(&sg_index_lock, flags); 1544 idr_remove(&sg_index_idr, sdp->index); 1545 write_unlock_irqrestore(&sg_index_lock, flags); 1546 1547 SCSI_LOG_TIMEOUT(3, 1548 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); 1549 1550 put_disk(sdp->disk); 1551 kfree(sdp); 1552 } 1553 1554 static void 1555 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) 1556 { 1557 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1558 Sg_device *sdp = dev_get_drvdata(cl_dev); 1559 unsigned long iflags; 1560 Sg_fd *sfp; 1561 int val; 1562 1563 if (!sdp) 1564 return; 1565 /* want sdp->detaching non-zero as soon as possible */ 1566 val = atomic_inc_return(&sdp->detaching); 1567 if (val > 1) 1568 return; /* only want to do following once per device */ 1569 1570 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1571 "%s\n", __func__)); 1572 1573 read_lock_irqsave(&sdp->sfd_lock, iflags); 1574 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1575 wake_up_interruptible_all(&sfp->read_wait); 1576 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1577 } 1578 wake_up_interruptible_all(&sdp->open_wait); 1579 read_unlock_irqrestore(&sdp->sfd_lock, iflags); 1580 1581 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1582 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1583 cdev_del(sdp->cdev); 1584 sdp->cdev = NULL; 1585 1586 kref_put(&sdp->d_ref, sg_device_destroy); 1587 } 1588 1589 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1590 module_param_named(def_reserved_size, def_reserved_size, int, 1591 S_IRUGO | S_IWUSR); 1592 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1593 1594 MODULE_AUTHOR("Douglas Gilbert"); 1595 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1596 MODULE_LICENSE("GPL"); 1597 MODULE_VERSION(SG_VERSION_STR); 1598 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1599 1600 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1601 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1602 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1603 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1604 1605 static int __init 1606 init_sg(void) 1607 { 1608 int rc; 1609 1610 if (scatter_elem_sz < PAGE_SIZE) { 1611 scatter_elem_sz = PAGE_SIZE; 1612 scatter_elem_sz_prev = scatter_elem_sz; 1613 } 1614 if (def_reserved_size >= 0) 1615 sg_big_buff = def_reserved_size; 1616 else 1617 def_reserved_size = sg_big_buff; 1618 1619 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1620 SG_MAX_DEVS, "sg"); 1621 if (rc) 1622 return rc; 1623 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1624 if ( IS_ERR(sg_sysfs_class) ) { 1625 rc = PTR_ERR(sg_sysfs_class); 1626 goto err_out; 1627 } 1628 sg_sysfs_valid = 1; 1629 rc = scsi_register_interface(&sg_interface); 1630 if (0 == rc) { 1631 #ifdef CONFIG_SCSI_PROC_FS 1632 sg_proc_init(); 1633 #endif /* CONFIG_SCSI_PROC_FS */ 1634 return 0; 1635 } 1636 class_destroy(sg_sysfs_class); 1637 err_out: 1638 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1639 return rc; 1640 } 1641 1642 static void __exit 1643 exit_sg(void) 1644 { 1645 #ifdef CONFIG_SCSI_PROC_FS 1646 sg_proc_cleanup(); 1647 #endif /* CONFIG_SCSI_PROC_FS */ 1648 scsi_unregister_interface(&sg_interface); 1649 class_destroy(sg_sysfs_class); 1650 sg_sysfs_valid = 0; 1651 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1652 SG_MAX_DEVS); 1653 idr_destroy(&sg_index_idr); 1654 } 1655 1656 static int 1657 sg_start_req(Sg_request *srp, unsigned char *cmd) 1658 { 1659 int res; 1660 struct request *rq; 1661 Sg_fd *sfp = srp->parentfp; 1662 sg_io_hdr_t *hp = &srp->header; 1663 int dxfer_len = (int) hp->dxfer_len; 1664 int dxfer_dir = hp->dxfer_direction; 1665 unsigned int iov_count = hp->iovec_count; 1666 Sg_scatter_hold *req_schp = &srp->data; 1667 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1668 struct request_queue *q = sfp->parentdp->device->request_queue; 1669 struct rq_map_data *md, map_data; 1670 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1671 unsigned char *long_cmdp = NULL; 1672 1673 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1674 "sg_start_req: dxfer_len=%d\n", 1675 dxfer_len)); 1676 1677 if (hp->cmd_len > BLK_MAX_CDB) { 1678 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); 1679 if (!long_cmdp) 1680 return -ENOMEM; 1681 } 1682 1683 /* 1684 * NOTE 1685 * 1686 * With scsi-mq enabled, there are a fixed number of preallocated 1687 * requests equal in number to shost->can_queue. If all of the 1688 * preallocated requests are already in use, then using GFP_ATOMIC with 1689 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL 1690 * will cause blk_get_request() to sleep until an active command 1691 * completes, freeing up a request. Neither option is ideal, but 1692 * GFP_KERNEL is the better choice to prevent userspace from getting an 1693 * unexpected EWOULDBLOCK. 1694 * 1695 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually 1696 * does not sleep except under memory pressure. 1697 */ 1698 rq = blk_get_request(q, rw, GFP_KERNEL); 1699 if (IS_ERR(rq)) { 1700 kfree(long_cmdp); 1701 return PTR_ERR(rq); 1702 } 1703 1704 blk_rq_set_block_pc(rq); 1705 1706 if (hp->cmd_len > BLK_MAX_CDB) 1707 rq->cmd = long_cmdp; 1708 memcpy(rq->cmd, cmd, hp->cmd_len); 1709 rq->cmd_len = hp->cmd_len; 1710 1711 srp->rq = rq; 1712 rq->end_io_data = srp; 1713 rq->sense = srp->sense_b; 1714 rq->retries = SG_DEFAULT_RETRIES; 1715 1716 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1717 return 0; 1718 1719 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1720 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1721 !sfp->parentdp->device->host->unchecked_isa_dma && 1722 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1723 md = NULL; 1724 else 1725 md = &map_data; 1726 1727 if (md) { 1728 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1729 sg_link_reserve(sfp, srp, dxfer_len); 1730 else { 1731 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1732 if (res) 1733 return res; 1734 } 1735 1736 md->pages = req_schp->pages; 1737 md->page_order = req_schp->page_order; 1738 md->nr_entries = req_schp->k_use_sg; 1739 md->offset = 0; 1740 md->null_mapped = hp->dxferp ? 0 : 1; 1741 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1742 md->from_user = 1; 1743 else 1744 md->from_user = 0; 1745 } 1746 1747 if (iov_count) { 1748 struct iovec *iov = NULL; 1749 struct iov_iter i; 1750 1751 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); 1752 if (res < 0) 1753 return res; 1754 1755 iov_iter_truncate(&i, hp->dxfer_len); 1756 if (!iov_iter_count(&i)) { 1757 kfree(iov); 1758 return -EINVAL; 1759 } 1760 1761 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC); 1762 kfree(iov); 1763 } else 1764 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1765 hp->dxfer_len, GFP_ATOMIC); 1766 1767 if (!res) { 1768 srp->bio = rq->bio; 1769 1770 if (!md) { 1771 req_schp->dio_in_use = 1; 1772 hp->info |= SG_INFO_DIRECT_IO; 1773 } 1774 } 1775 return res; 1776 } 1777 1778 static int 1779 sg_finish_rem_req(Sg_request *srp) 1780 { 1781 int ret = 0; 1782 1783 Sg_fd *sfp = srp->parentfp; 1784 Sg_scatter_hold *req_schp = &srp->data; 1785 1786 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1787 "sg_finish_rem_req: res_used=%d\n", 1788 (int) srp->res_used)); 1789 if (srp->bio) 1790 ret = blk_rq_unmap_user(srp->bio); 1791 1792 if (srp->rq) { 1793 if (srp->rq->cmd != srp->rq->__cmd) 1794 kfree(srp->rq->cmd); 1795 blk_put_request(srp->rq); 1796 } 1797 1798 if (srp->res_used) 1799 sg_unlink_reserve(sfp, srp); 1800 else 1801 sg_remove_scat(sfp, req_schp); 1802 1803 sg_remove_request(sfp, srp); 1804 1805 return ret; 1806 } 1807 1808 static int 1809 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1810 { 1811 int sg_bufflen = tablesize * sizeof(struct page *); 1812 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1813 1814 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1815 if (!schp->pages) 1816 return -ENOMEM; 1817 schp->sglist_len = sg_bufflen; 1818 return tablesize; /* number of scat_gath elements allocated */ 1819 } 1820 1821 static int 1822 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1823 { 1824 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1825 int sg_tablesize = sfp->parentdp->sg_tablesize; 1826 int blk_size = buff_size, order; 1827 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1828 1829 if (blk_size < 0) 1830 return -EFAULT; 1831 if (0 == blk_size) 1832 ++blk_size; /* don't know why */ 1833 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1834 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1835 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1836 "sg_build_indirect: buff_size=%d, blk_size=%d\n", 1837 buff_size, blk_size)); 1838 1839 /* N.B. ret_sz carried into this block ... */ 1840 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1841 if (mx_sc_elems < 0) 1842 return mx_sc_elems; /* most likely -ENOMEM */ 1843 1844 num = scatter_elem_sz; 1845 if (unlikely(num != scatter_elem_sz_prev)) { 1846 if (num < PAGE_SIZE) { 1847 scatter_elem_sz = PAGE_SIZE; 1848 scatter_elem_sz_prev = PAGE_SIZE; 1849 } else 1850 scatter_elem_sz_prev = num; 1851 } 1852 1853 if (sfp->low_dma) 1854 gfp_mask |= GFP_DMA; 1855 1856 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1857 gfp_mask |= __GFP_ZERO; 1858 1859 order = get_order(num); 1860 retry: 1861 ret_sz = 1 << (PAGE_SHIFT + order); 1862 1863 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1864 k++, rem_sz -= ret_sz) { 1865 1866 num = (rem_sz > scatter_elem_sz_prev) ? 1867 scatter_elem_sz_prev : rem_sz; 1868 1869 schp->pages[k] = alloc_pages(gfp_mask, order); 1870 if (!schp->pages[k]) 1871 goto out; 1872 1873 if (num == scatter_elem_sz_prev) { 1874 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1875 scatter_elem_sz = ret_sz; 1876 scatter_elem_sz_prev = ret_sz; 1877 } 1878 } 1879 1880 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, 1881 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", 1882 k, num, ret_sz)); 1883 } /* end of for loop */ 1884 1885 schp->page_order = order; 1886 schp->k_use_sg = k; 1887 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, 1888 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", 1889 k, rem_sz)); 1890 1891 schp->bufflen = blk_size; 1892 if (rem_sz > 0) /* must have failed */ 1893 return -ENOMEM; 1894 return 0; 1895 out: 1896 for (i = 0; i < k; i++) 1897 __free_pages(schp->pages[i], order); 1898 1899 if (--order >= 0) 1900 goto retry; 1901 1902 return -ENOMEM; 1903 } 1904 1905 static void 1906 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) 1907 { 1908 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1909 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1910 if (schp->pages && schp->sglist_len > 0) { 1911 if (!schp->dio_in_use) { 1912 int k; 1913 1914 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1915 SCSI_LOG_TIMEOUT(5, 1916 sg_printk(KERN_INFO, sfp->parentdp, 1917 "sg_remove_scat: k=%d, pg=0x%p\n", 1918 k, schp->pages[k])); 1919 __free_pages(schp->pages[k], schp->page_order); 1920 } 1921 1922 kfree(schp->pages); 1923 } 1924 } 1925 memset(schp, 0, sizeof (*schp)); 1926 } 1927 1928 static int 1929 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1930 { 1931 Sg_scatter_hold *schp = &srp->data; 1932 int k, num; 1933 1934 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, 1935 "sg_read_oxfer: num_read_xfer=%d\n", 1936 num_read_xfer)); 1937 if ((!outp) || (num_read_xfer <= 0)) 1938 return 0; 1939 1940 num = 1 << (PAGE_SHIFT + schp->page_order); 1941 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1942 if (num > num_read_xfer) { 1943 if (__copy_to_user(outp, page_address(schp->pages[k]), 1944 num_read_xfer)) 1945 return -EFAULT; 1946 break; 1947 } else { 1948 if (__copy_to_user(outp, page_address(schp->pages[k]), 1949 num)) 1950 return -EFAULT; 1951 num_read_xfer -= num; 1952 if (num_read_xfer <= 0) 1953 break; 1954 outp += num; 1955 } 1956 } 1957 1958 return 0; 1959 } 1960 1961 static void 1962 sg_build_reserve(Sg_fd * sfp, int req_size) 1963 { 1964 Sg_scatter_hold *schp = &sfp->reserve; 1965 1966 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1967 "sg_build_reserve: req_size=%d\n", req_size)); 1968 do { 1969 if (req_size < PAGE_SIZE) 1970 req_size = PAGE_SIZE; 1971 if (0 == sg_build_indirect(schp, sfp, req_size)) 1972 return; 1973 else 1974 sg_remove_scat(sfp, schp); 1975 req_size >>= 1; /* divide by 2 */ 1976 } while (req_size > (PAGE_SIZE / 2)); 1977 } 1978 1979 static void 1980 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1981 { 1982 Sg_scatter_hold *req_schp = &srp->data; 1983 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1984 int k, num, rem; 1985 1986 srp->res_used = 1; 1987 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1988 "sg_link_reserve: size=%d\n", size)); 1989 rem = size; 1990 1991 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1992 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1993 if (rem <= num) { 1994 req_schp->k_use_sg = k + 1; 1995 req_schp->sglist_len = rsv_schp->sglist_len; 1996 req_schp->pages = rsv_schp->pages; 1997 1998 req_schp->bufflen = size; 1999 req_schp->page_order = rsv_schp->page_order; 2000 break; 2001 } else 2002 rem -= num; 2003 } 2004 2005 if (k >= rsv_schp->k_use_sg) 2006 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 2007 "sg_link_reserve: BAD size\n")); 2008 } 2009 2010 static void 2011 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2012 { 2013 Sg_scatter_hold *req_schp = &srp->data; 2014 2015 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, 2016 "sg_unlink_reserve: req->k_use_sg=%d\n", 2017 (int) req_schp->k_use_sg)); 2018 req_schp->k_use_sg = 0; 2019 req_schp->bufflen = 0; 2020 req_schp->pages = NULL; 2021 req_schp->page_order = 0; 2022 req_schp->sglist_len = 0; 2023 sfp->save_scat_len = 0; 2024 srp->res_used = 0; 2025 } 2026 2027 static Sg_request * 2028 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2029 { 2030 Sg_request *resp; 2031 unsigned long iflags; 2032 2033 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2034 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2035 /* look for requests that are ready + not SG_IO owned */ 2036 if ((1 == resp->done) && (!resp->sg_io_owned) && 2037 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2038 resp->done = 2; /* guard against other readers */ 2039 break; 2040 } 2041 } 2042 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2043 return resp; 2044 } 2045 2046 /* always adds to end of list */ 2047 static Sg_request * 2048 sg_add_request(Sg_fd * sfp) 2049 { 2050 int k; 2051 unsigned long iflags; 2052 Sg_request *resp; 2053 Sg_request *rp = sfp->req_arr; 2054 2055 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2056 resp = sfp->headrp; 2057 if (!resp) { 2058 memset(rp, 0, sizeof (Sg_request)); 2059 rp->parentfp = sfp; 2060 resp = rp; 2061 sfp->headrp = resp; 2062 } else { 2063 if (0 == sfp->cmd_q) 2064 resp = NULL; /* command queuing disallowed */ 2065 else { 2066 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2067 if (!rp->parentfp) 2068 break; 2069 } 2070 if (k < SG_MAX_QUEUE) { 2071 memset(rp, 0, sizeof (Sg_request)); 2072 rp->parentfp = sfp; 2073 while (resp->nextrp) 2074 resp = resp->nextrp; 2075 resp->nextrp = rp; 2076 resp = rp; 2077 } else 2078 resp = NULL; 2079 } 2080 } 2081 if (resp) { 2082 resp->nextrp = NULL; 2083 resp->header.duration = jiffies_to_msecs(jiffies); 2084 } 2085 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2086 return resp; 2087 } 2088 2089 /* Return of 1 for found; 0 for not found */ 2090 static int 2091 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2092 { 2093 Sg_request *prev_rp; 2094 Sg_request *rp; 2095 unsigned long iflags; 2096 int res = 0; 2097 2098 if ((!sfp) || (!srp) || (!sfp->headrp)) 2099 return res; 2100 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2101 prev_rp = sfp->headrp; 2102 if (srp == prev_rp) { 2103 sfp->headrp = prev_rp->nextrp; 2104 prev_rp->parentfp = NULL; 2105 res = 1; 2106 } else { 2107 while ((rp = prev_rp->nextrp)) { 2108 if (srp == rp) { 2109 prev_rp->nextrp = rp->nextrp; 2110 rp->parentfp = NULL; 2111 res = 1; 2112 break; 2113 } 2114 prev_rp = rp; 2115 } 2116 } 2117 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2118 return res; 2119 } 2120 2121 static Sg_fd * 2122 sg_add_sfp(Sg_device * sdp) 2123 { 2124 Sg_fd *sfp; 2125 unsigned long iflags; 2126 int bufflen; 2127 2128 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2129 if (!sfp) 2130 return ERR_PTR(-ENOMEM); 2131 2132 init_waitqueue_head(&sfp->read_wait); 2133 rwlock_init(&sfp->rq_list_lock); 2134 2135 kref_init(&sfp->f_ref); 2136 sfp->timeout = SG_DEFAULT_TIMEOUT; 2137 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2138 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2139 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2140 sdp->device->host->unchecked_isa_dma : 1; 2141 sfp->cmd_q = SG_DEF_COMMAND_Q; 2142 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2143 sfp->parentdp = sdp; 2144 write_lock_irqsave(&sdp->sfd_lock, iflags); 2145 if (atomic_read(&sdp->detaching)) { 2146 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2147 return ERR_PTR(-ENODEV); 2148 } 2149 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2150 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2151 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 2152 "sg_add_sfp: sfp=0x%p\n", sfp)); 2153 if (unlikely(sg_big_buff != def_reserved_size)) 2154 sg_big_buff = def_reserved_size; 2155 2156 bufflen = min_t(int, sg_big_buff, 2157 max_sectors_bytes(sdp->device->request_queue)); 2158 sg_build_reserve(sfp, bufflen); 2159 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 2160 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2161 sfp->reserve.bufflen, 2162 sfp->reserve.k_use_sg)); 2163 2164 kref_get(&sdp->d_ref); 2165 __module_get(THIS_MODULE); 2166 return sfp; 2167 } 2168 2169 static void 2170 sg_remove_sfp_usercontext(struct work_struct *work) 2171 { 2172 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2173 struct sg_device *sdp = sfp->parentdp; 2174 2175 /* Cleanup any responses which were never read(). */ 2176 while (sfp->headrp) 2177 sg_finish_rem_req(sfp->headrp); 2178 2179 if (sfp->reserve.bufflen > 0) { 2180 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, 2181 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2182 (int) sfp->reserve.bufflen, 2183 (int) sfp->reserve.k_use_sg)); 2184 sg_remove_scat(sfp, &sfp->reserve); 2185 } 2186 2187 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, 2188 "sg_remove_sfp: sfp=0x%p\n", sfp)); 2189 kfree(sfp); 2190 2191 scsi_device_put(sdp->device); 2192 kref_put(&sdp->d_ref, sg_device_destroy); 2193 module_put(THIS_MODULE); 2194 } 2195 2196 static void 2197 sg_remove_sfp(struct kref *kref) 2198 { 2199 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2200 struct sg_device *sdp = sfp->parentdp; 2201 unsigned long iflags; 2202 2203 write_lock_irqsave(&sdp->sfd_lock, iflags); 2204 list_del(&sfp->sfd_siblings); 2205 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2206 2207 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2208 schedule_work(&sfp->ew.work); 2209 } 2210 2211 static int 2212 sg_res_in_use(Sg_fd * sfp) 2213 { 2214 const Sg_request *srp; 2215 unsigned long iflags; 2216 2217 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2218 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2219 if (srp->res_used) 2220 break; 2221 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2222 return srp ? 1 : 0; 2223 } 2224 2225 #ifdef CONFIG_SCSI_PROC_FS 2226 static int 2227 sg_idr_max_id(int id, void *p, void *data) 2228 { 2229 int *k = data; 2230 2231 if (*k < id) 2232 *k = id; 2233 2234 return 0; 2235 } 2236 2237 static int 2238 sg_last_dev(void) 2239 { 2240 int k = -1; 2241 unsigned long iflags; 2242 2243 read_lock_irqsave(&sg_index_lock, iflags); 2244 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2245 read_unlock_irqrestore(&sg_index_lock, iflags); 2246 return k + 1; /* origin 1 */ 2247 } 2248 #endif 2249 2250 /* must be called with sg_index_lock held */ 2251 static Sg_device *sg_lookup_dev(int dev) 2252 { 2253 return idr_find(&sg_index_idr, dev); 2254 } 2255 2256 static Sg_device * 2257 sg_get_dev(int dev) 2258 { 2259 struct sg_device *sdp; 2260 unsigned long flags; 2261 2262 read_lock_irqsave(&sg_index_lock, flags); 2263 sdp = sg_lookup_dev(dev); 2264 if (!sdp) 2265 sdp = ERR_PTR(-ENXIO); 2266 else if (atomic_read(&sdp->detaching)) { 2267 /* If sdp->detaching, then the refcount may already be 0, in 2268 * which case it would be a bug to do kref_get(). 2269 */ 2270 sdp = ERR_PTR(-ENODEV); 2271 } else 2272 kref_get(&sdp->d_ref); 2273 read_unlock_irqrestore(&sg_index_lock, flags); 2274 2275 return sdp; 2276 } 2277 2278 #ifdef CONFIG_SCSI_PROC_FS 2279 2280 static struct proc_dir_entry *sg_proc_sgp = NULL; 2281 2282 static char sg_proc_sg_dirname[] = "scsi/sg"; 2283 2284 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2285 2286 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2287 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2288 size_t count, loff_t *off); 2289 static const struct file_operations adio_fops = { 2290 .owner = THIS_MODULE, 2291 .open = sg_proc_single_open_adio, 2292 .read = seq_read, 2293 .llseek = seq_lseek, 2294 .write = sg_proc_write_adio, 2295 .release = single_release, 2296 }; 2297 2298 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2299 static ssize_t sg_proc_write_dressz(struct file *filp, 2300 const char __user *buffer, size_t count, loff_t *off); 2301 static const struct file_operations dressz_fops = { 2302 .owner = THIS_MODULE, 2303 .open = sg_proc_single_open_dressz, 2304 .read = seq_read, 2305 .llseek = seq_lseek, 2306 .write = sg_proc_write_dressz, 2307 .release = single_release, 2308 }; 2309 2310 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2311 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2312 static const struct file_operations version_fops = { 2313 .owner = THIS_MODULE, 2314 .open = sg_proc_single_open_version, 2315 .read = seq_read, 2316 .llseek = seq_lseek, 2317 .release = single_release, 2318 }; 2319 2320 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2321 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2322 static const struct file_operations devhdr_fops = { 2323 .owner = THIS_MODULE, 2324 .open = sg_proc_single_open_devhdr, 2325 .read = seq_read, 2326 .llseek = seq_lseek, 2327 .release = single_release, 2328 }; 2329 2330 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2331 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2332 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2333 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2334 static void dev_seq_stop(struct seq_file *s, void *v); 2335 static const struct file_operations dev_fops = { 2336 .owner = THIS_MODULE, 2337 .open = sg_proc_open_dev, 2338 .read = seq_read, 2339 .llseek = seq_lseek, 2340 .release = seq_release, 2341 }; 2342 static const struct seq_operations dev_seq_ops = { 2343 .start = dev_seq_start, 2344 .next = dev_seq_next, 2345 .stop = dev_seq_stop, 2346 .show = sg_proc_seq_show_dev, 2347 }; 2348 2349 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2350 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2351 static const struct file_operations devstrs_fops = { 2352 .owner = THIS_MODULE, 2353 .open = sg_proc_open_devstrs, 2354 .read = seq_read, 2355 .llseek = seq_lseek, 2356 .release = seq_release, 2357 }; 2358 static const struct seq_operations devstrs_seq_ops = { 2359 .start = dev_seq_start, 2360 .next = dev_seq_next, 2361 .stop = dev_seq_stop, 2362 .show = sg_proc_seq_show_devstrs, 2363 }; 2364 2365 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2366 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2367 static const struct file_operations debug_fops = { 2368 .owner = THIS_MODULE, 2369 .open = sg_proc_open_debug, 2370 .read = seq_read, 2371 .llseek = seq_lseek, 2372 .release = seq_release, 2373 }; 2374 static const struct seq_operations debug_seq_ops = { 2375 .start = dev_seq_start, 2376 .next = dev_seq_next, 2377 .stop = dev_seq_stop, 2378 .show = sg_proc_seq_show_debug, 2379 }; 2380 2381 2382 struct sg_proc_leaf { 2383 const char * name; 2384 const struct file_operations * fops; 2385 }; 2386 2387 static const struct sg_proc_leaf sg_proc_leaf_arr[] = { 2388 {"allow_dio", &adio_fops}, 2389 {"debug", &debug_fops}, 2390 {"def_reserved_size", &dressz_fops}, 2391 {"device_hdr", &devhdr_fops}, 2392 {"devices", &dev_fops}, 2393 {"device_strs", &devstrs_fops}, 2394 {"version", &version_fops} 2395 }; 2396 2397 static int 2398 sg_proc_init(void) 2399 { 2400 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2401 int k; 2402 2403 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2404 if (!sg_proc_sgp) 2405 return 1; 2406 for (k = 0; k < num_leaves; ++k) { 2407 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2408 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2409 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2410 } 2411 return 0; 2412 } 2413 2414 static void 2415 sg_proc_cleanup(void) 2416 { 2417 int k; 2418 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2419 2420 if (!sg_proc_sgp) 2421 return; 2422 for (k = 0; k < num_leaves; ++k) 2423 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2424 remove_proc_entry(sg_proc_sg_dirname, NULL); 2425 } 2426 2427 2428 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2429 { 2430 seq_printf(s, "%d\n", *((int *)s->private)); 2431 return 0; 2432 } 2433 2434 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2435 { 2436 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2437 } 2438 2439 static ssize_t 2440 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2441 size_t count, loff_t *off) 2442 { 2443 int err; 2444 unsigned long num; 2445 2446 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2447 return -EACCES; 2448 err = kstrtoul_from_user(buffer, count, 0, &num); 2449 if (err) 2450 return err; 2451 sg_allow_dio = num ? 1 : 0; 2452 return count; 2453 } 2454 2455 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2456 { 2457 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2458 } 2459 2460 static ssize_t 2461 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2462 size_t count, loff_t *off) 2463 { 2464 int err; 2465 unsigned long k = ULONG_MAX; 2466 2467 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2468 return -EACCES; 2469 2470 err = kstrtoul_from_user(buffer, count, 0, &k); 2471 if (err) 2472 return err; 2473 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2474 sg_big_buff = k; 2475 return count; 2476 } 2477 return -ERANGE; 2478 } 2479 2480 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2481 { 2482 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2483 sg_version_date); 2484 return 0; 2485 } 2486 2487 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2488 { 2489 return single_open(file, sg_proc_seq_show_version, NULL); 2490 } 2491 2492 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2493 { 2494 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); 2495 return 0; 2496 } 2497 2498 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2499 { 2500 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2501 } 2502 2503 struct sg_proc_deviter { 2504 loff_t index; 2505 size_t max; 2506 }; 2507 2508 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2509 { 2510 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2511 2512 s->private = it; 2513 if (! it) 2514 return NULL; 2515 2516 it->index = *pos; 2517 it->max = sg_last_dev(); 2518 if (it->index >= it->max) 2519 return NULL; 2520 return it; 2521 } 2522 2523 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2524 { 2525 struct sg_proc_deviter * it = s->private; 2526 2527 *pos = ++it->index; 2528 return (it->index < it->max) ? it : NULL; 2529 } 2530 2531 static void dev_seq_stop(struct seq_file *s, void *v) 2532 { 2533 kfree(s->private); 2534 } 2535 2536 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2537 { 2538 return seq_open(file, &dev_seq_ops); 2539 } 2540 2541 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2542 { 2543 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2544 Sg_device *sdp; 2545 struct scsi_device *scsidp; 2546 unsigned long iflags; 2547 2548 read_lock_irqsave(&sg_index_lock, iflags); 2549 sdp = it ? sg_lookup_dev(it->index) : NULL; 2550 if ((NULL == sdp) || (NULL == sdp->device) || 2551 (atomic_read(&sdp->detaching))) 2552 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2553 else { 2554 scsidp = sdp->device; 2555 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", 2556 scsidp->host->host_no, scsidp->channel, 2557 scsidp->id, scsidp->lun, (int) scsidp->type, 2558 1, 2559 (int) scsidp->queue_depth, 2560 (int) atomic_read(&scsidp->device_busy), 2561 (int) scsi_device_online(scsidp)); 2562 } 2563 read_unlock_irqrestore(&sg_index_lock, iflags); 2564 return 0; 2565 } 2566 2567 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2568 { 2569 return seq_open(file, &devstrs_seq_ops); 2570 } 2571 2572 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2573 { 2574 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2575 Sg_device *sdp; 2576 struct scsi_device *scsidp; 2577 unsigned long iflags; 2578 2579 read_lock_irqsave(&sg_index_lock, iflags); 2580 sdp = it ? sg_lookup_dev(it->index) : NULL; 2581 scsidp = sdp ? sdp->device : NULL; 2582 if (sdp && scsidp && (!atomic_read(&sdp->detaching))) 2583 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2584 scsidp->vendor, scsidp->model, scsidp->rev); 2585 else 2586 seq_puts(s, "<no active device>\n"); 2587 read_unlock_irqrestore(&sg_index_lock, iflags); 2588 return 0; 2589 } 2590 2591 /* must be called while holding sg_index_lock */ 2592 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2593 { 2594 int k, m, new_interface, blen, usg; 2595 Sg_request *srp; 2596 Sg_fd *fp; 2597 const sg_io_hdr_t *hp; 2598 const char * cp; 2599 unsigned int ms; 2600 2601 k = 0; 2602 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2603 k++; 2604 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2605 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2606 "(res)sgat=%d low_dma=%d\n", k, 2607 jiffies_to_msecs(fp->timeout), 2608 fp->reserve.bufflen, 2609 (int) fp->reserve.k_use_sg, 2610 (int) fp->low_dma); 2611 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", 2612 (int) fp->cmd_q, (int) fp->force_packid, 2613 (int) fp->keep_orphan); 2614 for (m = 0, srp = fp->headrp; 2615 srp != NULL; 2616 ++m, srp = srp->nextrp) { 2617 hp = &srp->header; 2618 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2619 if (srp->res_used) { 2620 if (new_interface && 2621 (SG_FLAG_MMAP_IO & hp->flags)) 2622 cp = " mmap>> "; 2623 else 2624 cp = " rb>> "; 2625 } else { 2626 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2627 cp = " dio>> "; 2628 else 2629 cp = " "; 2630 } 2631 seq_puts(s, cp); 2632 blen = srp->data.bufflen; 2633 usg = srp->data.k_use_sg; 2634 seq_puts(s, srp->done ? 2635 ((1 == srp->done) ? "rcv:" : "fin:") 2636 : "act:"); 2637 seq_printf(s, " id=%d blen=%d", 2638 srp->header.pack_id, blen); 2639 if (srp->done) 2640 seq_printf(s, " dur=%d", hp->duration); 2641 else { 2642 ms = jiffies_to_msecs(jiffies); 2643 seq_printf(s, " t_o/elap=%d/%d", 2644 (new_interface ? hp->timeout : 2645 jiffies_to_msecs(fp->timeout)), 2646 (ms > hp->duration ? ms - hp->duration : 0)); 2647 } 2648 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2649 (int) srp->data.cmd_opcode); 2650 } 2651 if (0 == m) 2652 seq_puts(s, " No requests active\n"); 2653 read_unlock(&fp->rq_list_lock); 2654 } 2655 } 2656 2657 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2658 { 2659 return seq_open(file, &debug_seq_ops); 2660 } 2661 2662 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2663 { 2664 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2665 Sg_device *sdp; 2666 unsigned long iflags; 2667 2668 if (it && (0 == it->index)) 2669 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", 2670 (int)it->max, sg_big_buff); 2671 2672 read_lock_irqsave(&sg_index_lock, iflags); 2673 sdp = it ? sg_lookup_dev(it->index) : NULL; 2674 if (NULL == sdp) 2675 goto skip; 2676 read_lock(&sdp->sfd_lock); 2677 if (!list_empty(&sdp->sfds)) { 2678 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2679 if (atomic_read(&sdp->detaching)) 2680 seq_puts(s, "detaching pending close "); 2681 else if (sdp->device) { 2682 struct scsi_device *scsidp = sdp->device; 2683 2684 seq_printf(s, "%d:%d:%d:%llu em=%d", 2685 scsidp->host->host_no, 2686 scsidp->channel, scsidp->id, 2687 scsidp->lun, 2688 scsidp->host->hostt->emulated); 2689 } 2690 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", 2691 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); 2692 sg_proc_debug_helper(s, sdp); 2693 } 2694 read_unlock(&sdp->sfd_lock); 2695 skip: 2696 read_unlock_irqrestore(&sg_index_lock, iflags); 2697 return 0; 2698 } 2699 2700 #endif /* CONFIG_SCSI_PROC_FS */ 2701 2702 module_init(init_sg); 2703 module_exit(exit_sg); 2704