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 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30534; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.34" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/errno.h> 39 #include <linux/mtio.h> 40 #include <linux/ioctl.h> 41 #include <linux/slab.h> 42 #include <linux/fcntl.h> 43 #include <linux/init.h> 44 #include <linux/poll.h> 45 #include <linux/moduleparam.h> 46 #include <linux/cdev.h> 47 #include <linux/idr.h> 48 #include <linux/seq_file.h> 49 #include <linux/blkdev.h> 50 #include <linux/delay.h> 51 #include <linux/blktrace_api.h> 52 #include <linux/mutex.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> 66 static char *sg_version_date = "20061027"; 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 /* 77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 78 * Then when using 32 bit integers x * m may overflow during the calculation. 79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 80 * calculates the same, but prevents the overflow when both m and d 81 * are "small" numbers (like HZ and USER_HZ). 82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 83 * in 32 bits. 84 */ 85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 86 87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 88 89 int sg_big_buff = SG_DEF_RESERVED_SIZE; 90 /* N.B. This variable is readable and writeable via 91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 92 of this size (or less if there is not enough memory) will be reserved 93 for use by this file descriptor. [Deprecated usage: this variable is also 94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 95 the kernel (i.e. it is not a module).] */ 96 static int def_reserved_size = -1; /* picks up init parameter */ 97 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 98 99 static int scatter_elem_sz = SG_SCATTER_SZ; 100 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 101 102 #define SG_SECTOR_SZ 512 103 104 static int sg_add(struct device *, struct class_interface *); 105 static void sg_remove(struct device *, struct class_interface *); 106 107 static DEFINE_SPINLOCK(sg_open_exclusive_lock); 108 109 static DEFINE_IDR(sg_index_idr); 110 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 111 file descriptor list for device */ 112 113 static struct class_interface sg_interface = { 114 .add_dev = sg_add, 115 .remove_dev = sg_remove, 116 }; 117 118 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 119 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 120 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 121 unsigned bufflen; /* Size of (aggregate) data buffer */ 122 struct page **pages; 123 int page_order; 124 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 125 unsigned char cmd_opcode; /* first byte of command */ 126 } Sg_scatter_hold; 127 128 struct sg_device; /* forward declarations */ 129 struct sg_fd; 130 131 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 132 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 133 struct sg_fd *parentfp; /* NULL -> not in use */ 134 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 135 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 136 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 137 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 138 char orphan; /* 1 -> drop on sight, 0 -> normal */ 139 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 140 /* done protected by rq_list_lock */ 141 char done; /* 0->before bh, 1->before read, 2->read */ 142 struct request *rq; 143 struct bio *bio; 144 struct execute_work ew; 145 } Sg_request; 146 147 typedef struct sg_fd { /* holds the state of a file descriptor */ 148 /* sfd_siblings is protected by sg_index_lock */ 149 struct list_head sfd_siblings; 150 struct sg_device *parentdp; /* owning device */ 151 wait_queue_head_t read_wait; /* queue read until command done */ 152 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 153 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 154 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 155 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 156 unsigned save_scat_len; /* original length of trunc. scat. element */ 157 Sg_request *headrp; /* head of request slist, NULL->empty */ 158 struct fasync_struct *async_qp; /* used by asynchronous notification */ 159 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 160 char low_dma; /* as in parent but possibly overridden to 1 */ 161 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 162 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 163 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 164 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 165 char mmap_called; /* 0 -> mmap() never called on this fd */ 166 struct kref f_ref; 167 struct execute_work ew; 168 } Sg_fd; 169 170 typedef struct sg_device { /* holds the state of each scsi generic device */ 171 struct scsi_device *device; 172 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 173 int sg_tablesize; /* adapter's max scatter-gather table size */ 174 u32 index; /* device index number */ 175 /* sfds is protected by sg_index_lock */ 176 struct list_head sfds; 177 volatile char detached; /* 0->attached, 1->detached pending removal */ 178 /* exclude protected by sg_open_exclusive_lock */ 179 char exclude; /* opened for exclusive access */ 180 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 181 struct gendisk *disk; 182 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 183 struct kref d_ref; 184 } Sg_device; 185 186 /* tasklet or soft irq callback */ 187 static void sg_rq_end_io(struct request *rq, int uptodate); 188 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 189 static int sg_finish_rem_req(Sg_request * srp); 190 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 191 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 192 Sg_request * srp); 193 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 194 const char __user *buf, size_t count, int blocking, 195 int read_only, int sg_io_owned, Sg_request **o_srp); 196 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 197 unsigned char *cmnd, int timeout, int blocking); 198 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 199 static void sg_remove_scat(Sg_scatter_hold * schp); 200 static void sg_build_reserve(Sg_fd * sfp, int req_size); 201 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 202 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 203 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 204 static void sg_remove_sfp(struct kref *); 205 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 206 static Sg_request *sg_add_request(Sg_fd * sfp); 207 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 208 static int sg_res_in_use(Sg_fd * sfp); 209 static Sg_device *sg_get_dev(int dev); 210 static void sg_put_dev(Sg_device *sdp); 211 212 #define SZ_SG_HEADER sizeof(struct sg_header) 213 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 214 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 215 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 216 217 static int sg_allow_access(struct file *filp, unsigned char *cmd) 218 { 219 struct sg_fd *sfp = filp->private_data; 220 221 if (sfp->parentdp->device->type == TYPE_SCANNER) 222 return 0; 223 224 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 225 } 226 227 static int get_exclude(Sg_device *sdp) 228 { 229 unsigned long flags; 230 int ret; 231 232 spin_lock_irqsave(&sg_open_exclusive_lock, flags); 233 ret = sdp->exclude; 234 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags); 235 return ret; 236 } 237 238 static int set_exclude(Sg_device *sdp, char val) 239 { 240 unsigned long flags; 241 242 spin_lock_irqsave(&sg_open_exclusive_lock, flags); 243 sdp->exclude = val; 244 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags); 245 return val; 246 } 247 248 static int sfds_list_empty(Sg_device *sdp) 249 { 250 unsigned long flags; 251 int ret; 252 253 read_lock_irqsave(&sg_index_lock, flags); 254 ret = list_empty(&sdp->sfds); 255 read_unlock_irqrestore(&sg_index_lock, flags); 256 return ret; 257 } 258 259 static int 260 sg_open(struct inode *inode, struct file *filp) 261 { 262 int dev = iminor(inode); 263 int flags = filp->f_flags; 264 struct request_queue *q; 265 Sg_device *sdp; 266 Sg_fd *sfp; 267 int res; 268 int retval; 269 270 nonseekable_open(inode, filp); 271 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 272 sdp = sg_get_dev(dev); 273 if (IS_ERR(sdp)) { 274 retval = PTR_ERR(sdp); 275 sdp = NULL; 276 goto sg_put; 277 } 278 279 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 280 /* Prevent the device driver from vanishing while we sleep */ 281 retval = scsi_device_get(sdp->device); 282 if (retval) 283 goto sg_put; 284 285 retval = scsi_autopm_get_device(sdp->device); 286 if (retval) 287 goto sdp_put; 288 289 if (!((flags & O_NONBLOCK) || 290 scsi_block_when_processing_errors(sdp->device))) { 291 retval = -ENXIO; 292 /* we are in error recovery for this device */ 293 goto error_out; 294 } 295 296 if (flags & O_EXCL) { 297 if (O_RDONLY == (flags & O_ACCMODE)) { 298 retval = -EPERM; /* Can't lock it with read only access */ 299 goto error_out; 300 } 301 if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) { 302 retval = -EBUSY; 303 goto error_out; 304 } 305 res = wait_event_interruptible(sdp->o_excl_wait, 306 ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1))); 307 if (res) { 308 retval = res; /* -ERESTARTSYS because signal hit process */ 309 goto error_out; 310 } 311 } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */ 312 if (flags & O_NONBLOCK) { 313 retval = -EBUSY; 314 goto error_out; 315 } 316 res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp)); 317 if (res) { 318 retval = res; /* -ERESTARTSYS because signal hit process */ 319 goto error_out; 320 } 321 } 322 if (sdp->detached) { 323 retval = -ENODEV; 324 goto error_out; 325 } 326 if (sfds_list_empty(sdp)) { /* no existing opens on this device */ 327 sdp->sgdebug = 0; 328 q = sdp->device->request_queue; 329 sdp->sg_tablesize = queue_max_segments(q); 330 } 331 if ((sfp = sg_add_sfp(sdp, dev))) 332 filp->private_data = sfp; 333 else { 334 if (flags & O_EXCL) { 335 set_exclude(sdp, 0); /* undo if error */ 336 wake_up_interruptible(&sdp->o_excl_wait); 337 } 338 retval = -ENOMEM; 339 goto error_out; 340 } 341 retval = 0; 342 error_out: 343 if (retval) { 344 scsi_autopm_put_device(sdp->device); 345 sdp_put: 346 scsi_device_put(sdp->device); 347 } 348 sg_put: 349 if (sdp) 350 sg_put_dev(sdp); 351 return retval; 352 } 353 354 /* Following function was formerly called 'sg_close' */ 355 static int 356 sg_release(struct inode *inode, struct file *filp) 357 { 358 Sg_device *sdp; 359 Sg_fd *sfp; 360 361 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 362 return -ENXIO; 363 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 364 365 set_exclude(sdp, 0); 366 wake_up_interruptible(&sdp->o_excl_wait); 367 368 scsi_autopm_put_device(sdp->device); 369 kref_put(&sfp->f_ref, sg_remove_sfp); 370 return 0; 371 } 372 373 static ssize_t 374 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 375 { 376 Sg_device *sdp; 377 Sg_fd *sfp; 378 Sg_request *srp; 379 int req_pack_id = -1; 380 sg_io_hdr_t *hp; 381 struct sg_header *old_hdr = NULL; 382 int retval = 0; 383 384 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 385 return -ENXIO; 386 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 387 sdp->disk->disk_name, (int) count)); 388 389 if (!access_ok(VERIFY_WRITE, buf, count)) 390 return -EFAULT; 391 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 392 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 393 if (!old_hdr) 394 return -ENOMEM; 395 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 396 retval = -EFAULT; 397 goto free_old_hdr; 398 } 399 if (old_hdr->reply_len < 0) { 400 if (count >= SZ_SG_IO_HDR) { 401 sg_io_hdr_t *new_hdr; 402 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 403 if (!new_hdr) { 404 retval = -ENOMEM; 405 goto free_old_hdr; 406 } 407 retval =__copy_from_user 408 (new_hdr, buf, SZ_SG_IO_HDR); 409 req_pack_id = new_hdr->pack_id; 410 kfree(new_hdr); 411 if (retval) { 412 retval = -EFAULT; 413 goto free_old_hdr; 414 } 415 } 416 } else 417 req_pack_id = old_hdr->pack_id; 418 } 419 srp = sg_get_rq_mark(sfp, req_pack_id); 420 if (!srp) { /* now wait on packet to arrive */ 421 if (sdp->detached) { 422 retval = -ENODEV; 423 goto free_old_hdr; 424 } 425 if (filp->f_flags & O_NONBLOCK) { 426 retval = -EAGAIN; 427 goto free_old_hdr; 428 } 429 retval = wait_event_interruptible(sfp->read_wait, 430 (sdp->detached || 431 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 432 if (sdp->detached) { 433 retval = -ENODEV; 434 goto free_old_hdr; 435 } 436 if (retval) { 437 /* -ERESTARTSYS as signal hit process */ 438 goto free_old_hdr; 439 } 440 } 441 if (srp->header.interface_id != '\0') { 442 retval = sg_new_read(sfp, buf, count, srp); 443 goto free_old_hdr; 444 } 445 446 hp = &srp->header; 447 if (old_hdr == NULL) { 448 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 449 if (! old_hdr) { 450 retval = -ENOMEM; 451 goto free_old_hdr; 452 } 453 } 454 memset(old_hdr, 0, SZ_SG_HEADER); 455 old_hdr->reply_len = (int) hp->timeout; 456 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 457 old_hdr->pack_id = hp->pack_id; 458 old_hdr->twelve_byte = 459 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 460 old_hdr->target_status = hp->masked_status; 461 old_hdr->host_status = hp->host_status; 462 old_hdr->driver_status = hp->driver_status; 463 if ((CHECK_CONDITION & hp->masked_status) || 464 (DRIVER_SENSE & hp->driver_status)) 465 memcpy(old_hdr->sense_buffer, srp->sense_b, 466 sizeof (old_hdr->sense_buffer)); 467 switch (hp->host_status) { 468 /* This setup of 'result' is for backward compatibility and is best 469 ignored by the user who should use target, host + driver status */ 470 case DID_OK: 471 case DID_PASSTHROUGH: 472 case DID_SOFT_ERROR: 473 old_hdr->result = 0; 474 break; 475 case DID_NO_CONNECT: 476 case DID_BUS_BUSY: 477 case DID_TIME_OUT: 478 old_hdr->result = EBUSY; 479 break; 480 case DID_BAD_TARGET: 481 case DID_ABORT: 482 case DID_PARITY: 483 case DID_RESET: 484 case DID_BAD_INTR: 485 old_hdr->result = EIO; 486 break; 487 case DID_ERROR: 488 old_hdr->result = (srp->sense_b[0] == 0 && 489 hp->masked_status == GOOD) ? 0 : EIO; 490 break; 491 default: 492 old_hdr->result = EIO; 493 break; 494 } 495 496 /* Now copy the result back to the user buffer. */ 497 if (count >= SZ_SG_HEADER) { 498 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 499 retval = -EFAULT; 500 goto free_old_hdr; 501 } 502 buf += SZ_SG_HEADER; 503 if (count > old_hdr->reply_len) 504 count = old_hdr->reply_len; 505 if (count > SZ_SG_HEADER) { 506 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 507 retval = -EFAULT; 508 goto free_old_hdr; 509 } 510 } 511 } else 512 count = (old_hdr->result == 0) ? 0 : -EIO; 513 sg_finish_rem_req(srp); 514 retval = count; 515 free_old_hdr: 516 kfree(old_hdr); 517 return retval; 518 } 519 520 static ssize_t 521 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 522 { 523 sg_io_hdr_t *hp = &srp->header; 524 int err = 0; 525 int len; 526 527 if (count < SZ_SG_IO_HDR) { 528 err = -EINVAL; 529 goto err_out; 530 } 531 hp->sb_len_wr = 0; 532 if ((hp->mx_sb_len > 0) && hp->sbp) { 533 if ((CHECK_CONDITION & hp->masked_status) || 534 (DRIVER_SENSE & hp->driver_status)) { 535 int sb_len = SCSI_SENSE_BUFFERSIZE; 536 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 537 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 538 len = (len > sb_len) ? sb_len : len; 539 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 540 err = -EFAULT; 541 goto err_out; 542 } 543 hp->sb_len_wr = len; 544 } 545 } 546 if (hp->masked_status || hp->host_status || hp->driver_status) 547 hp->info |= SG_INFO_CHECK; 548 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 549 err = -EFAULT; 550 goto err_out; 551 } 552 err_out: 553 err = sg_finish_rem_req(srp); 554 return (0 == err) ? count : err; 555 } 556 557 static ssize_t 558 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 559 { 560 int mxsize, cmd_size, k; 561 int input_size, blocking; 562 unsigned char opcode; 563 Sg_device *sdp; 564 Sg_fd *sfp; 565 Sg_request *srp; 566 struct sg_header old_hdr; 567 sg_io_hdr_t *hp; 568 unsigned char cmnd[MAX_COMMAND_SIZE]; 569 570 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 571 return -ENXIO; 572 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 573 sdp->disk->disk_name, (int) count)); 574 if (sdp->detached) 575 return -ENODEV; 576 if (!((filp->f_flags & O_NONBLOCK) || 577 scsi_block_when_processing_errors(sdp->device))) 578 return -ENXIO; 579 580 if (!access_ok(VERIFY_READ, buf, count)) 581 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 582 if (count < SZ_SG_HEADER) 583 return -EIO; 584 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 585 return -EFAULT; 586 blocking = !(filp->f_flags & O_NONBLOCK); 587 if (old_hdr.reply_len < 0) 588 return sg_new_write(sfp, filp, buf, count, 589 blocking, 0, 0, NULL); 590 if (count < (SZ_SG_HEADER + 6)) 591 return -EIO; /* The minimum scsi command length is 6 bytes. */ 592 593 if (!(srp = sg_add_request(sfp))) { 594 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 595 return -EDOM; 596 } 597 buf += SZ_SG_HEADER; 598 __get_user(opcode, buf); 599 if (sfp->next_cmd_len > 0) { 600 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 601 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 602 sfp->next_cmd_len = 0; 603 sg_remove_request(sfp, srp); 604 return -EIO; 605 } 606 cmd_size = sfp->next_cmd_len; 607 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 608 } else { 609 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 610 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 611 cmd_size = 12; 612 } 613 SCSI_LOG_TIMEOUT(4, printk( 614 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 615 /* Determine buffer size. */ 616 input_size = count - cmd_size; 617 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 618 mxsize -= SZ_SG_HEADER; 619 input_size -= SZ_SG_HEADER; 620 if (input_size < 0) { 621 sg_remove_request(sfp, srp); 622 return -EIO; /* User did not pass enough bytes for this command. */ 623 } 624 hp = &srp->header; 625 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 626 hp->cmd_len = (unsigned char) cmd_size; 627 hp->iovec_count = 0; 628 hp->mx_sb_len = 0; 629 if (input_size > 0) 630 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 631 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 632 else 633 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 634 hp->dxfer_len = mxsize; 635 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 636 hp->dxferp = (char __user *)buf + cmd_size; 637 else 638 hp->dxferp = NULL; 639 hp->sbp = NULL; 640 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 641 hp->flags = input_size; /* structure abuse ... */ 642 hp->pack_id = old_hdr.pack_id; 643 hp->usr_ptr = NULL; 644 if (__copy_from_user(cmnd, buf, cmd_size)) 645 return -EFAULT; 646 /* 647 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 648 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 649 * is a non-zero input_size, so emit a warning. 650 */ 651 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 652 static char cmd[TASK_COMM_LEN]; 653 if (strcmp(current->comm, cmd)) { 654 printk_ratelimited(KERN_WARNING 655 "sg_write: data in/out %d/%d bytes " 656 "for SCSI command 0x%x-- guessing " 657 "data in;\n program %s not setting " 658 "count and/or reply_len properly\n", 659 old_hdr.reply_len - (int)SZ_SG_HEADER, 660 input_size, (unsigned int) cmnd[0], 661 current->comm); 662 strcpy(cmd, current->comm); 663 } 664 } 665 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 666 return (k < 0) ? k : count; 667 } 668 669 static ssize_t 670 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 671 size_t count, int blocking, int read_only, int sg_io_owned, 672 Sg_request **o_srp) 673 { 674 int k; 675 Sg_request *srp; 676 sg_io_hdr_t *hp; 677 unsigned char cmnd[MAX_COMMAND_SIZE]; 678 int timeout; 679 unsigned long ul_timeout; 680 681 if (count < SZ_SG_IO_HDR) 682 return -EINVAL; 683 if (!access_ok(VERIFY_READ, buf, count)) 684 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 685 686 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 687 if (!(srp = sg_add_request(sfp))) { 688 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 689 return -EDOM; 690 } 691 srp->sg_io_owned = sg_io_owned; 692 hp = &srp->header; 693 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 694 sg_remove_request(sfp, srp); 695 return -EFAULT; 696 } 697 if (hp->interface_id != 'S') { 698 sg_remove_request(sfp, srp); 699 return -ENOSYS; 700 } 701 if (hp->flags & SG_FLAG_MMAP_IO) { 702 if (hp->dxfer_len > sfp->reserve.bufflen) { 703 sg_remove_request(sfp, srp); 704 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 705 } 706 if (hp->flags & SG_FLAG_DIRECT_IO) { 707 sg_remove_request(sfp, srp); 708 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 709 } 710 if (sg_res_in_use(sfp)) { 711 sg_remove_request(sfp, srp); 712 return -EBUSY; /* reserve buffer already being used */ 713 } 714 } 715 ul_timeout = msecs_to_jiffies(srp->header.timeout); 716 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 717 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 718 sg_remove_request(sfp, srp); 719 return -EMSGSIZE; 720 } 721 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 722 sg_remove_request(sfp, srp); 723 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 724 } 725 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 726 sg_remove_request(sfp, srp); 727 return -EFAULT; 728 } 729 if (read_only && sg_allow_access(file, cmnd)) { 730 sg_remove_request(sfp, srp); 731 return -EPERM; 732 } 733 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 734 if (k < 0) 735 return k; 736 if (o_srp) 737 *o_srp = srp; 738 return count; 739 } 740 741 static int 742 sg_common_write(Sg_fd * sfp, Sg_request * srp, 743 unsigned char *cmnd, int timeout, int blocking) 744 { 745 int k, data_dir; 746 Sg_device *sdp = sfp->parentdp; 747 sg_io_hdr_t *hp = &srp->header; 748 749 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 750 hp->status = 0; 751 hp->masked_status = 0; 752 hp->msg_status = 0; 753 hp->info = 0; 754 hp->host_status = 0; 755 hp->driver_status = 0; 756 hp->resid = 0; 757 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 758 (int) cmnd[0], (int) hp->cmd_len)); 759 760 k = sg_start_req(srp, cmnd); 761 if (k) { 762 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 763 sg_finish_rem_req(srp); 764 return k; /* probably out of space --> ENOMEM */ 765 } 766 if (sdp->detached) { 767 if (srp->bio) 768 blk_end_request_all(srp->rq, -EIO); 769 sg_finish_rem_req(srp); 770 return -ENODEV; 771 } 772 773 switch (hp->dxfer_direction) { 774 case SG_DXFER_TO_FROM_DEV: 775 case SG_DXFER_FROM_DEV: 776 data_dir = DMA_FROM_DEVICE; 777 break; 778 case SG_DXFER_TO_DEV: 779 data_dir = DMA_TO_DEVICE; 780 break; 781 case SG_DXFER_UNKNOWN: 782 data_dir = DMA_BIDIRECTIONAL; 783 break; 784 default: 785 data_dir = DMA_NONE; 786 break; 787 } 788 hp->duration = jiffies_to_msecs(jiffies); 789 790 srp->rq->timeout = timeout; 791 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 792 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 793 srp->rq, 1, sg_rq_end_io); 794 return 0; 795 } 796 797 static int srp_done(Sg_fd *sfp, Sg_request *srp) 798 { 799 unsigned long flags; 800 int ret; 801 802 read_lock_irqsave(&sfp->rq_list_lock, flags); 803 ret = srp->done; 804 read_unlock_irqrestore(&sfp->rq_list_lock, flags); 805 return ret; 806 } 807 808 static long 809 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 810 { 811 void __user *p = (void __user *)arg; 812 int __user *ip = p; 813 int result, val, read_only; 814 Sg_device *sdp; 815 Sg_fd *sfp; 816 Sg_request *srp; 817 unsigned long iflags; 818 819 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 820 return -ENXIO; 821 822 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 823 sdp->disk->disk_name, (int) cmd_in)); 824 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 825 826 switch (cmd_in) { 827 case SG_IO: 828 if (sdp->detached) 829 return -ENODEV; 830 if (!scsi_block_when_processing_errors(sdp->device)) 831 return -ENXIO; 832 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 833 return -EFAULT; 834 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 835 1, read_only, 1, &srp); 836 if (result < 0) 837 return result; 838 result = wait_event_interruptible(sfp->read_wait, 839 (srp_done(sfp, srp) || sdp->detached)); 840 if (sdp->detached) 841 return -ENODEV; 842 write_lock_irq(&sfp->rq_list_lock); 843 if (srp->done) { 844 srp->done = 2; 845 write_unlock_irq(&sfp->rq_list_lock); 846 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 847 return (result < 0) ? result : 0; 848 } 849 srp->orphan = 1; 850 write_unlock_irq(&sfp->rq_list_lock); 851 return result; /* -ERESTARTSYS because signal hit process */ 852 case SG_SET_TIMEOUT: 853 result = get_user(val, ip); 854 if (result) 855 return result; 856 if (val < 0) 857 return -EIO; 858 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 859 val = MULDIV (INT_MAX, USER_HZ, HZ); 860 sfp->timeout_user = val; 861 sfp->timeout = MULDIV (val, HZ, USER_HZ); 862 863 return 0; 864 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 865 /* strange ..., for backward compatibility */ 866 return sfp->timeout_user; 867 case SG_SET_FORCE_LOW_DMA: 868 result = get_user(val, ip); 869 if (result) 870 return result; 871 if (val) { 872 sfp->low_dma = 1; 873 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 874 val = (int) sfp->reserve.bufflen; 875 sg_remove_scat(&sfp->reserve); 876 sg_build_reserve(sfp, val); 877 } 878 } else { 879 if (sdp->detached) 880 return -ENODEV; 881 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 882 } 883 return 0; 884 case SG_GET_LOW_DMA: 885 return put_user((int) sfp->low_dma, ip); 886 case SG_GET_SCSI_ID: 887 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 888 return -EFAULT; 889 else { 890 sg_scsi_id_t __user *sg_idp = p; 891 892 if (sdp->detached) 893 return -ENODEV; 894 __put_user((int) sdp->device->host->host_no, 895 &sg_idp->host_no); 896 __put_user((int) sdp->device->channel, 897 &sg_idp->channel); 898 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 899 __put_user((int) sdp->device->lun, &sg_idp->lun); 900 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 901 __put_user((short) sdp->device->host->cmd_per_lun, 902 &sg_idp->h_cmd_per_lun); 903 __put_user((short) sdp->device->queue_depth, 904 &sg_idp->d_queue_depth); 905 __put_user(0, &sg_idp->unused[0]); 906 __put_user(0, &sg_idp->unused[1]); 907 return 0; 908 } 909 case SG_SET_FORCE_PACK_ID: 910 result = get_user(val, ip); 911 if (result) 912 return result; 913 sfp->force_packid = val ? 1 : 0; 914 return 0; 915 case SG_GET_PACK_ID: 916 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 917 return -EFAULT; 918 read_lock_irqsave(&sfp->rq_list_lock, iflags); 919 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 920 if ((1 == srp->done) && (!srp->sg_io_owned)) { 921 read_unlock_irqrestore(&sfp->rq_list_lock, 922 iflags); 923 __put_user(srp->header.pack_id, ip); 924 return 0; 925 } 926 } 927 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 928 __put_user(-1, ip); 929 return 0; 930 case SG_GET_NUM_WAITING: 931 read_lock_irqsave(&sfp->rq_list_lock, iflags); 932 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 933 if ((1 == srp->done) && (!srp->sg_io_owned)) 934 ++val; 935 } 936 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 937 return put_user(val, ip); 938 case SG_GET_SG_TABLESIZE: 939 return put_user(sdp->sg_tablesize, ip); 940 case SG_SET_RESERVED_SIZE: 941 result = get_user(val, ip); 942 if (result) 943 return result; 944 if (val < 0) 945 return -EINVAL; 946 val = min_t(int, val, 947 queue_max_sectors(sdp->device->request_queue) * 512); 948 if (val != sfp->reserve.bufflen) { 949 if (sg_res_in_use(sfp) || sfp->mmap_called) 950 return -EBUSY; 951 sg_remove_scat(&sfp->reserve); 952 sg_build_reserve(sfp, val); 953 } 954 return 0; 955 case SG_GET_RESERVED_SIZE: 956 val = min_t(int, sfp->reserve.bufflen, 957 queue_max_sectors(sdp->device->request_queue) * 512); 958 return put_user(val, ip); 959 case SG_SET_COMMAND_Q: 960 result = get_user(val, ip); 961 if (result) 962 return result; 963 sfp->cmd_q = val ? 1 : 0; 964 return 0; 965 case SG_GET_COMMAND_Q: 966 return put_user((int) sfp->cmd_q, ip); 967 case SG_SET_KEEP_ORPHAN: 968 result = get_user(val, ip); 969 if (result) 970 return result; 971 sfp->keep_orphan = val; 972 return 0; 973 case SG_GET_KEEP_ORPHAN: 974 return put_user((int) sfp->keep_orphan, ip); 975 case SG_NEXT_CMD_LEN: 976 result = get_user(val, ip); 977 if (result) 978 return result; 979 sfp->next_cmd_len = (val > 0) ? val : 0; 980 return 0; 981 case SG_GET_VERSION_NUM: 982 return put_user(sg_version_num, ip); 983 case SG_GET_ACCESS_COUNT: 984 /* faked - we don't have a real access count anymore */ 985 val = (sdp->device ? 1 : 0); 986 return put_user(val, ip); 987 case SG_GET_REQUEST_TABLE: 988 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 989 return -EFAULT; 990 else { 991 sg_req_info_t *rinfo; 992 unsigned int ms; 993 994 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 995 GFP_KERNEL); 996 if (!rinfo) 997 return -ENOMEM; 998 read_lock_irqsave(&sfp->rq_list_lock, iflags); 999 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 1000 ++val, srp = srp ? srp->nextrp : srp) { 1001 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 1002 if (srp) { 1003 rinfo[val].req_state = srp->done + 1; 1004 rinfo[val].problem = 1005 srp->header.masked_status & 1006 srp->header.host_status & 1007 srp->header.driver_status; 1008 if (srp->done) 1009 rinfo[val].duration = 1010 srp->header.duration; 1011 else { 1012 ms = jiffies_to_msecs(jiffies); 1013 rinfo[val].duration = 1014 (ms > srp->header.duration) ? 1015 (ms - srp->header.duration) : 0; 1016 } 1017 rinfo[val].orphan = srp->orphan; 1018 rinfo[val].sg_io_owned = 1019 srp->sg_io_owned; 1020 rinfo[val].pack_id = 1021 srp->header.pack_id; 1022 rinfo[val].usr_ptr = 1023 srp->header.usr_ptr; 1024 } 1025 } 1026 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1027 result = __copy_to_user(p, rinfo, 1028 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1029 result = result ? -EFAULT : 0; 1030 kfree(rinfo); 1031 return result; 1032 } 1033 case SG_EMULATED_HOST: 1034 if (sdp->detached) 1035 return -ENODEV; 1036 return put_user(sdp->device->host->hostt->emulated, ip); 1037 case SG_SCSI_RESET: 1038 if (sdp->detached) 1039 return -ENODEV; 1040 if (filp->f_flags & O_NONBLOCK) { 1041 if (scsi_host_in_recovery(sdp->device->host)) 1042 return -EBUSY; 1043 } else if (!scsi_block_when_processing_errors(sdp->device)) 1044 return -EBUSY; 1045 result = get_user(val, ip); 1046 if (result) 1047 return result; 1048 if (SG_SCSI_RESET_NOTHING == val) 1049 return 0; 1050 switch (val) { 1051 case SG_SCSI_RESET_DEVICE: 1052 val = SCSI_TRY_RESET_DEVICE; 1053 break; 1054 case SG_SCSI_RESET_TARGET: 1055 val = SCSI_TRY_RESET_TARGET; 1056 break; 1057 case SG_SCSI_RESET_BUS: 1058 val = SCSI_TRY_RESET_BUS; 1059 break; 1060 case SG_SCSI_RESET_HOST: 1061 val = SCSI_TRY_RESET_HOST; 1062 break; 1063 default: 1064 return -EINVAL; 1065 } 1066 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1067 return -EACCES; 1068 return (scsi_reset_provider(sdp->device, val) == 1069 SUCCESS) ? 0 : -EIO; 1070 case SCSI_IOCTL_SEND_COMMAND: 1071 if (sdp->detached) 1072 return -ENODEV; 1073 if (read_only) { 1074 unsigned char opcode = WRITE_6; 1075 Scsi_Ioctl_Command __user *siocp = p; 1076 1077 if (copy_from_user(&opcode, siocp->data, 1)) 1078 return -EFAULT; 1079 if (sg_allow_access(filp, &opcode)) 1080 return -EPERM; 1081 } 1082 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1083 case SG_SET_DEBUG: 1084 result = get_user(val, ip); 1085 if (result) 1086 return result; 1087 sdp->sgdebug = (char) val; 1088 return 0; 1089 case SCSI_IOCTL_GET_IDLUN: 1090 case SCSI_IOCTL_GET_BUS_NUMBER: 1091 case SCSI_IOCTL_PROBE_HOST: 1092 case SG_GET_TRANSFORM: 1093 if (sdp->detached) 1094 return -ENODEV; 1095 return scsi_ioctl(sdp->device, cmd_in, p); 1096 case BLKSECTGET: 1097 return put_user(queue_max_sectors(sdp->device->request_queue) * 512, 1098 ip); 1099 case BLKTRACESETUP: 1100 return blk_trace_setup(sdp->device->request_queue, 1101 sdp->disk->disk_name, 1102 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1103 NULL, 1104 (char *)arg); 1105 case BLKTRACESTART: 1106 return blk_trace_startstop(sdp->device->request_queue, 1); 1107 case BLKTRACESTOP: 1108 return blk_trace_startstop(sdp->device->request_queue, 0); 1109 case BLKTRACETEARDOWN: 1110 return blk_trace_remove(sdp->device->request_queue); 1111 default: 1112 if (read_only) 1113 return -EPERM; /* don't know so take safe approach */ 1114 return scsi_ioctl(sdp->device, cmd_in, p); 1115 } 1116 } 1117 1118 #ifdef CONFIG_COMPAT 1119 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1120 { 1121 Sg_device *sdp; 1122 Sg_fd *sfp; 1123 struct scsi_device *sdev; 1124 1125 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1126 return -ENXIO; 1127 1128 sdev = sdp->device; 1129 if (sdev->host->hostt->compat_ioctl) { 1130 int ret; 1131 1132 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1133 1134 return ret; 1135 } 1136 1137 return -ENOIOCTLCMD; 1138 } 1139 #endif 1140 1141 static unsigned int 1142 sg_poll(struct file *filp, poll_table * wait) 1143 { 1144 unsigned int res = 0; 1145 Sg_device *sdp; 1146 Sg_fd *sfp; 1147 Sg_request *srp; 1148 int count = 0; 1149 unsigned long iflags; 1150 1151 sfp = filp->private_data; 1152 if (!sfp) 1153 return POLLERR; 1154 sdp = sfp->parentdp; 1155 if (!sdp) 1156 return POLLERR; 1157 poll_wait(filp, &sfp->read_wait, wait); 1158 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1159 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1160 /* if any read waiting, flag it */ 1161 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1162 res = POLLIN | POLLRDNORM; 1163 ++count; 1164 } 1165 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1166 1167 if (sdp->detached) 1168 res |= POLLHUP; 1169 else if (!sfp->cmd_q) { 1170 if (0 == count) 1171 res |= POLLOUT | POLLWRNORM; 1172 } else if (count < SG_MAX_QUEUE) 1173 res |= POLLOUT | POLLWRNORM; 1174 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1175 sdp->disk->disk_name, (int) res)); 1176 return res; 1177 } 1178 1179 static int 1180 sg_fasync(int fd, struct file *filp, int mode) 1181 { 1182 Sg_device *sdp; 1183 Sg_fd *sfp; 1184 1185 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1186 return -ENXIO; 1187 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1188 sdp->disk->disk_name, mode)); 1189 1190 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1191 } 1192 1193 static int 1194 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1195 { 1196 Sg_fd *sfp; 1197 unsigned long offset, len, sa; 1198 Sg_scatter_hold *rsv_schp; 1199 int k, length; 1200 1201 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1202 return VM_FAULT_SIGBUS; 1203 rsv_schp = &sfp->reserve; 1204 offset = vmf->pgoff << PAGE_SHIFT; 1205 if (offset >= rsv_schp->bufflen) 1206 return VM_FAULT_SIGBUS; 1207 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1208 offset, rsv_schp->k_use_sg)); 1209 sa = vma->vm_start; 1210 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1211 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1212 len = vma->vm_end - sa; 1213 len = (len < length) ? len : length; 1214 if (offset < len) { 1215 struct page *page = nth_page(rsv_schp->pages[k], 1216 offset >> PAGE_SHIFT); 1217 get_page(page); /* increment page count */ 1218 vmf->page = page; 1219 return 0; /* success */ 1220 } 1221 sa += len; 1222 offset -= len; 1223 } 1224 1225 return VM_FAULT_SIGBUS; 1226 } 1227 1228 static const struct vm_operations_struct sg_mmap_vm_ops = { 1229 .fault = sg_vma_fault, 1230 }; 1231 1232 static int 1233 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1234 { 1235 Sg_fd *sfp; 1236 unsigned long req_sz, len, sa; 1237 Sg_scatter_hold *rsv_schp; 1238 int k, length; 1239 1240 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1241 return -ENXIO; 1242 req_sz = vma->vm_end - vma->vm_start; 1243 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1244 (void *) vma->vm_start, (int) req_sz)); 1245 if (vma->vm_pgoff) 1246 return -EINVAL; /* want no offset */ 1247 rsv_schp = &sfp->reserve; 1248 if (req_sz > rsv_schp->bufflen) 1249 return -ENOMEM; /* cannot map more than reserved buffer */ 1250 1251 sa = vma->vm_start; 1252 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1253 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1254 len = vma->vm_end - sa; 1255 len = (len < length) ? len : length; 1256 sa += len; 1257 } 1258 1259 sfp->mmap_called = 1; 1260 vma->vm_flags |= VM_RESERVED; 1261 vma->vm_private_data = sfp; 1262 vma->vm_ops = &sg_mmap_vm_ops; 1263 return 0; 1264 } 1265 1266 static void sg_rq_end_io_usercontext(struct work_struct *work) 1267 { 1268 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1269 struct sg_fd *sfp = srp->parentfp; 1270 1271 sg_finish_rem_req(srp); 1272 kref_put(&sfp->f_ref, sg_remove_sfp); 1273 } 1274 1275 /* 1276 * This function is a "bottom half" handler that is called by the mid 1277 * level when a command is completed (or has failed). 1278 */ 1279 static void 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(sdp->detached)) 1298 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1299 1300 sense = rq->sense; 1301 result = rq->errors; 1302 resid = rq->resid_len; 1303 1304 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1305 sdp->disk->disk_name, srp->header.pack_id, result)); 1306 srp->header.resid = resid; 1307 ms = jiffies_to_msecs(jiffies); 1308 srp->header.duration = (ms > srp->header.duration) ? 1309 (ms - srp->header.duration) : 0; 1310 if (0 != result) { 1311 struct scsi_sense_hdr sshdr; 1312 1313 srp->header.status = 0xff & result; 1314 srp->header.masked_status = status_byte(result); 1315 srp->header.msg_status = msg_byte(result); 1316 srp->header.host_status = host_byte(result); 1317 srp->header.driver_status = driver_byte(result); 1318 if ((sdp->sgdebug > 0) && 1319 ((CHECK_CONDITION == srp->header.masked_status) || 1320 (COMMAND_TERMINATED == srp->header.masked_status))) 1321 __scsi_print_sense("sg_cmd_done", sense, 1322 SCSI_SENSE_BUFFERSIZE); 1323 1324 /* Following if statement is a patch supplied by Eric Youngdale */ 1325 if (driver_byte(result) != 0 1326 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1327 && !scsi_sense_is_deferred(&sshdr) 1328 && sshdr.sense_key == UNIT_ATTENTION 1329 && sdp->device->removable) { 1330 /* Detected possible disc change. Set the bit - this */ 1331 /* may be used if there are filesystems using this device */ 1332 sdp->device->changed = 1; 1333 } 1334 } 1335 /* Rely on write phase to clean out srp status values, so no "else" */ 1336 1337 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1338 if (unlikely(srp->orphan)) { 1339 if (sfp->keep_orphan) 1340 srp->sg_io_owned = 0; 1341 else 1342 done = 0; 1343 } 1344 srp->done = done; 1345 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1346 1347 if (likely(done)) { 1348 /* Now wake up any sg_read() that is waiting for this 1349 * packet. 1350 */ 1351 wake_up_interruptible(&sfp->read_wait); 1352 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1353 kref_put(&sfp->f_ref, sg_remove_sfp); 1354 } else { 1355 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1356 schedule_work(&srp->ew.work); 1357 } 1358 } 1359 1360 static const struct file_operations sg_fops = { 1361 .owner = THIS_MODULE, 1362 .read = sg_read, 1363 .write = sg_write, 1364 .poll = sg_poll, 1365 .unlocked_ioctl = sg_ioctl, 1366 #ifdef CONFIG_COMPAT 1367 .compat_ioctl = sg_compat_ioctl, 1368 #endif 1369 .open = sg_open, 1370 .mmap = sg_mmap, 1371 .release = sg_release, 1372 .fasync = sg_fasync, 1373 .llseek = no_llseek, 1374 }; 1375 1376 static struct class *sg_sysfs_class; 1377 1378 static int sg_sysfs_valid = 0; 1379 1380 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1381 { 1382 struct request_queue *q = scsidp->request_queue; 1383 Sg_device *sdp; 1384 unsigned long iflags; 1385 int error; 1386 u32 k; 1387 1388 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1389 if (!sdp) { 1390 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1391 return ERR_PTR(-ENOMEM); 1392 } 1393 1394 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1395 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1396 error = -ENOMEM; 1397 goto out; 1398 } 1399 1400 write_lock_irqsave(&sg_index_lock, iflags); 1401 1402 error = idr_get_new(&sg_index_idr, sdp, &k); 1403 if (error) { 1404 write_unlock_irqrestore(&sg_index_lock, iflags); 1405 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1406 error); 1407 goto out; 1408 } 1409 1410 if (unlikely(k >= SG_MAX_DEVS)) 1411 goto overflow; 1412 1413 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1414 sprintf(disk->disk_name, "sg%d", k); 1415 disk->first_minor = k; 1416 sdp->disk = disk; 1417 sdp->device = scsidp; 1418 INIT_LIST_HEAD(&sdp->sfds); 1419 init_waitqueue_head(&sdp->o_excl_wait); 1420 sdp->sg_tablesize = queue_max_segments(q); 1421 sdp->index = k; 1422 kref_init(&sdp->d_ref); 1423 1424 write_unlock_irqrestore(&sg_index_lock, iflags); 1425 1426 error = 0; 1427 out: 1428 if (error) { 1429 kfree(sdp); 1430 return ERR_PTR(error); 1431 } 1432 return sdp; 1433 1434 overflow: 1435 idr_remove(&sg_index_idr, k); 1436 write_unlock_irqrestore(&sg_index_lock, iflags); 1437 sdev_printk(KERN_WARNING, scsidp, 1438 "Unable to attach sg device type=%d, minor " 1439 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1440 error = -ENODEV; 1441 goto out; 1442 } 1443 1444 static int 1445 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1446 { 1447 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1448 struct gendisk *disk; 1449 Sg_device *sdp = NULL; 1450 struct cdev * cdev = NULL; 1451 int error; 1452 unsigned long iflags; 1453 1454 disk = alloc_disk(1); 1455 if (!disk) { 1456 printk(KERN_WARNING "alloc_disk failed\n"); 1457 return -ENOMEM; 1458 } 1459 disk->major = SCSI_GENERIC_MAJOR; 1460 1461 error = -ENOMEM; 1462 cdev = cdev_alloc(); 1463 if (!cdev) { 1464 printk(KERN_WARNING "cdev_alloc failed\n"); 1465 goto out; 1466 } 1467 cdev->owner = THIS_MODULE; 1468 cdev->ops = &sg_fops; 1469 1470 sdp = sg_alloc(disk, scsidp); 1471 if (IS_ERR(sdp)) { 1472 printk(KERN_WARNING "sg_alloc failed\n"); 1473 error = PTR_ERR(sdp); 1474 goto out; 1475 } 1476 1477 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1478 if (error) 1479 goto cdev_add_err; 1480 1481 sdp->cdev = cdev; 1482 if (sg_sysfs_valid) { 1483 struct device *sg_class_member; 1484 1485 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1486 MKDEV(SCSI_GENERIC_MAJOR, 1487 sdp->index), 1488 sdp, "%s", disk->disk_name); 1489 if (IS_ERR(sg_class_member)) { 1490 printk(KERN_ERR "sg_add: " 1491 "device_create failed\n"); 1492 error = PTR_ERR(sg_class_member); 1493 goto cdev_add_err; 1494 } 1495 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1496 &sg_class_member->kobj, "generic"); 1497 if (error) 1498 printk(KERN_ERR "sg_add: unable to make symlink " 1499 "'generic' back to sg%d\n", sdp->index); 1500 } else 1501 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1502 1503 sdev_printk(KERN_NOTICE, scsidp, 1504 "Attached scsi generic sg%d type %d\n", sdp->index, 1505 scsidp->type); 1506 1507 dev_set_drvdata(cl_dev, sdp); 1508 1509 return 0; 1510 1511 cdev_add_err: 1512 write_lock_irqsave(&sg_index_lock, iflags); 1513 idr_remove(&sg_index_idr, sdp->index); 1514 write_unlock_irqrestore(&sg_index_lock, iflags); 1515 kfree(sdp); 1516 1517 out: 1518 put_disk(disk); 1519 if (cdev) 1520 cdev_del(cdev); 1521 return error; 1522 } 1523 1524 static void sg_device_destroy(struct kref *kref) 1525 { 1526 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1527 unsigned long flags; 1528 1529 /* CAUTION! Note that the device can still be found via idr_find() 1530 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1531 * any other cleanup. 1532 */ 1533 1534 write_lock_irqsave(&sg_index_lock, flags); 1535 idr_remove(&sg_index_idr, sdp->index); 1536 write_unlock_irqrestore(&sg_index_lock, flags); 1537 1538 SCSI_LOG_TIMEOUT(3, 1539 printk("sg_device_destroy: %s\n", 1540 sdp->disk->disk_name)); 1541 1542 put_disk(sdp->disk); 1543 kfree(sdp); 1544 } 1545 1546 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1547 { 1548 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1549 Sg_device *sdp = dev_get_drvdata(cl_dev); 1550 unsigned long iflags; 1551 Sg_fd *sfp; 1552 1553 if (!sdp || sdp->detached) 1554 return; 1555 1556 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1557 1558 /* Need a write lock to set sdp->detached. */ 1559 write_lock_irqsave(&sg_index_lock, iflags); 1560 sdp->detached = 1; 1561 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1562 wake_up_interruptible(&sfp->read_wait); 1563 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1564 } 1565 write_unlock_irqrestore(&sg_index_lock, iflags); 1566 1567 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1568 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1569 cdev_del(sdp->cdev); 1570 sdp->cdev = NULL; 1571 1572 sg_put_dev(sdp); 1573 } 1574 1575 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1576 module_param_named(def_reserved_size, def_reserved_size, int, 1577 S_IRUGO | S_IWUSR); 1578 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1579 1580 MODULE_AUTHOR("Douglas Gilbert"); 1581 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1582 MODULE_LICENSE("GPL"); 1583 MODULE_VERSION(SG_VERSION_STR); 1584 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1585 1586 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1587 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1588 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1589 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1590 1591 static int __init 1592 init_sg(void) 1593 { 1594 int rc; 1595 1596 if (scatter_elem_sz < PAGE_SIZE) { 1597 scatter_elem_sz = PAGE_SIZE; 1598 scatter_elem_sz_prev = scatter_elem_sz; 1599 } 1600 if (def_reserved_size >= 0) 1601 sg_big_buff = def_reserved_size; 1602 else 1603 def_reserved_size = sg_big_buff; 1604 1605 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1606 SG_MAX_DEVS, "sg"); 1607 if (rc) 1608 return rc; 1609 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1610 if ( IS_ERR(sg_sysfs_class) ) { 1611 rc = PTR_ERR(sg_sysfs_class); 1612 goto err_out; 1613 } 1614 sg_sysfs_valid = 1; 1615 rc = scsi_register_interface(&sg_interface); 1616 if (0 == rc) { 1617 #ifdef CONFIG_SCSI_PROC_FS 1618 sg_proc_init(); 1619 #endif /* CONFIG_SCSI_PROC_FS */ 1620 return 0; 1621 } 1622 class_destroy(sg_sysfs_class); 1623 err_out: 1624 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1625 return rc; 1626 } 1627 1628 static void __exit 1629 exit_sg(void) 1630 { 1631 #ifdef CONFIG_SCSI_PROC_FS 1632 sg_proc_cleanup(); 1633 #endif /* CONFIG_SCSI_PROC_FS */ 1634 scsi_unregister_interface(&sg_interface); 1635 class_destroy(sg_sysfs_class); 1636 sg_sysfs_valid = 0; 1637 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1638 SG_MAX_DEVS); 1639 idr_destroy(&sg_index_idr); 1640 } 1641 1642 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1643 { 1644 int res; 1645 struct request *rq; 1646 Sg_fd *sfp = srp->parentfp; 1647 sg_io_hdr_t *hp = &srp->header; 1648 int dxfer_len = (int) hp->dxfer_len; 1649 int dxfer_dir = hp->dxfer_direction; 1650 unsigned int iov_count = hp->iovec_count; 1651 Sg_scatter_hold *req_schp = &srp->data; 1652 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1653 struct request_queue *q = sfp->parentdp->device->request_queue; 1654 struct rq_map_data *md, map_data; 1655 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1656 1657 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1658 dxfer_len)); 1659 1660 rq = blk_get_request(q, rw, GFP_ATOMIC); 1661 if (!rq) 1662 return -ENOMEM; 1663 1664 memcpy(rq->cmd, cmd, hp->cmd_len); 1665 1666 rq->cmd_len = hp->cmd_len; 1667 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1668 1669 srp->rq = rq; 1670 rq->end_io_data = srp; 1671 rq->sense = srp->sense_b; 1672 rq->retries = SG_DEFAULT_RETRIES; 1673 1674 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1675 return 0; 1676 1677 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1678 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1679 !sfp->parentdp->device->host->unchecked_isa_dma && 1680 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1681 md = NULL; 1682 else 1683 md = &map_data; 1684 1685 if (md) { 1686 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1687 sg_link_reserve(sfp, srp, dxfer_len); 1688 else { 1689 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1690 if (res) 1691 return res; 1692 } 1693 1694 md->pages = req_schp->pages; 1695 md->page_order = req_schp->page_order; 1696 md->nr_entries = req_schp->k_use_sg; 1697 md->offset = 0; 1698 md->null_mapped = hp->dxferp ? 0 : 1; 1699 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1700 md->from_user = 1; 1701 else 1702 md->from_user = 0; 1703 } 1704 1705 if (iov_count) { 1706 int len, size = sizeof(struct sg_iovec) * iov_count; 1707 struct iovec *iov; 1708 1709 iov = memdup_user(hp->dxferp, size); 1710 if (IS_ERR(iov)) 1711 return PTR_ERR(iov); 1712 1713 len = iov_length(iov, iov_count); 1714 if (hp->dxfer_len < len) { 1715 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1716 len = hp->dxfer_len; 1717 } 1718 1719 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1720 iov_count, 1721 len, GFP_ATOMIC); 1722 kfree(iov); 1723 } else 1724 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1725 hp->dxfer_len, GFP_ATOMIC); 1726 1727 if (!res) { 1728 srp->bio = rq->bio; 1729 1730 if (!md) { 1731 req_schp->dio_in_use = 1; 1732 hp->info |= SG_INFO_DIRECT_IO; 1733 } 1734 } 1735 return res; 1736 } 1737 1738 static int sg_finish_rem_req(Sg_request * srp) 1739 { 1740 int ret = 0; 1741 1742 Sg_fd *sfp = srp->parentfp; 1743 Sg_scatter_hold *req_schp = &srp->data; 1744 1745 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1746 if (srp->rq) { 1747 if (srp->bio) 1748 ret = blk_rq_unmap_user(srp->bio); 1749 1750 blk_put_request(srp->rq); 1751 } 1752 1753 if (srp->res_used) 1754 sg_unlink_reserve(sfp, srp); 1755 else 1756 sg_remove_scat(req_schp); 1757 1758 sg_remove_request(sfp, srp); 1759 1760 return ret; 1761 } 1762 1763 static int 1764 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1765 { 1766 int sg_bufflen = tablesize * sizeof(struct page *); 1767 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1768 1769 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1770 if (!schp->pages) 1771 return -ENOMEM; 1772 schp->sglist_len = sg_bufflen; 1773 return tablesize; /* number of scat_gath elements allocated */ 1774 } 1775 1776 static int 1777 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1778 { 1779 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1780 int sg_tablesize = sfp->parentdp->sg_tablesize; 1781 int blk_size = buff_size, order; 1782 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1783 1784 if (blk_size < 0) 1785 return -EFAULT; 1786 if (0 == blk_size) 1787 ++blk_size; /* don't know why */ 1788 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1789 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1790 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1791 buff_size, blk_size)); 1792 1793 /* N.B. ret_sz carried into this block ... */ 1794 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1795 if (mx_sc_elems < 0) 1796 return mx_sc_elems; /* most likely -ENOMEM */ 1797 1798 num = scatter_elem_sz; 1799 if (unlikely(num != scatter_elem_sz_prev)) { 1800 if (num < PAGE_SIZE) { 1801 scatter_elem_sz = PAGE_SIZE; 1802 scatter_elem_sz_prev = PAGE_SIZE; 1803 } else 1804 scatter_elem_sz_prev = num; 1805 } 1806 1807 if (sfp->low_dma) 1808 gfp_mask |= GFP_DMA; 1809 1810 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1811 gfp_mask |= __GFP_ZERO; 1812 1813 order = get_order(num); 1814 retry: 1815 ret_sz = 1 << (PAGE_SHIFT + order); 1816 1817 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1818 k++, rem_sz -= ret_sz) { 1819 1820 num = (rem_sz > scatter_elem_sz_prev) ? 1821 scatter_elem_sz_prev : rem_sz; 1822 1823 schp->pages[k] = alloc_pages(gfp_mask, order); 1824 if (!schp->pages[k]) 1825 goto out; 1826 1827 if (num == scatter_elem_sz_prev) { 1828 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1829 scatter_elem_sz = ret_sz; 1830 scatter_elem_sz_prev = ret_sz; 1831 } 1832 } 1833 1834 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1835 "ret_sz=%d\n", k, num, ret_sz)); 1836 } /* end of for loop */ 1837 1838 schp->page_order = order; 1839 schp->k_use_sg = k; 1840 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1841 "rem_sz=%d\n", k, rem_sz)); 1842 1843 schp->bufflen = blk_size; 1844 if (rem_sz > 0) /* must have failed */ 1845 return -ENOMEM; 1846 return 0; 1847 out: 1848 for (i = 0; i < k; i++) 1849 __free_pages(schp->pages[i], order); 1850 1851 if (--order >= 0) 1852 goto retry; 1853 1854 return -ENOMEM; 1855 } 1856 1857 static void 1858 sg_remove_scat(Sg_scatter_hold * schp) 1859 { 1860 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1861 if (schp->pages && schp->sglist_len > 0) { 1862 if (!schp->dio_in_use) { 1863 int k; 1864 1865 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1866 SCSI_LOG_TIMEOUT(5, printk( 1867 "sg_remove_scat: k=%d, pg=0x%p\n", 1868 k, schp->pages[k])); 1869 __free_pages(schp->pages[k], schp->page_order); 1870 } 1871 1872 kfree(schp->pages); 1873 } 1874 } 1875 memset(schp, 0, sizeof (*schp)); 1876 } 1877 1878 static int 1879 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1880 { 1881 Sg_scatter_hold *schp = &srp->data; 1882 int k, num; 1883 1884 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1885 num_read_xfer)); 1886 if ((!outp) || (num_read_xfer <= 0)) 1887 return 0; 1888 1889 num = 1 << (PAGE_SHIFT + schp->page_order); 1890 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1891 if (num > num_read_xfer) { 1892 if (__copy_to_user(outp, page_address(schp->pages[k]), 1893 num_read_xfer)) 1894 return -EFAULT; 1895 break; 1896 } else { 1897 if (__copy_to_user(outp, page_address(schp->pages[k]), 1898 num)) 1899 return -EFAULT; 1900 num_read_xfer -= num; 1901 if (num_read_xfer <= 0) 1902 break; 1903 outp += num; 1904 } 1905 } 1906 1907 return 0; 1908 } 1909 1910 static void 1911 sg_build_reserve(Sg_fd * sfp, int req_size) 1912 { 1913 Sg_scatter_hold *schp = &sfp->reserve; 1914 1915 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1916 do { 1917 if (req_size < PAGE_SIZE) 1918 req_size = PAGE_SIZE; 1919 if (0 == sg_build_indirect(schp, sfp, req_size)) 1920 return; 1921 else 1922 sg_remove_scat(schp); 1923 req_size >>= 1; /* divide by 2 */ 1924 } while (req_size > (PAGE_SIZE / 2)); 1925 } 1926 1927 static void 1928 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1929 { 1930 Sg_scatter_hold *req_schp = &srp->data; 1931 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1932 int k, num, rem; 1933 1934 srp->res_used = 1; 1935 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1936 rem = size; 1937 1938 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1939 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1940 if (rem <= num) { 1941 req_schp->k_use_sg = k + 1; 1942 req_schp->sglist_len = rsv_schp->sglist_len; 1943 req_schp->pages = rsv_schp->pages; 1944 1945 req_schp->bufflen = size; 1946 req_schp->page_order = rsv_schp->page_order; 1947 break; 1948 } else 1949 rem -= num; 1950 } 1951 1952 if (k >= rsv_schp->k_use_sg) 1953 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1954 } 1955 1956 static void 1957 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1958 { 1959 Sg_scatter_hold *req_schp = &srp->data; 1960 1961 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1962 (int) req_schp->k_use_sg)); 1963 req_schp->k_use_sg = 0; 1964 req_schp->bufflen = 0; 1965 req_schp->pages = NULL; 1966 req_schp->page_order = 0; 1967 req_schp->sglist_len = 0; 1968 sfp->save_scat_len = 0; 1969 srp->res_used = 0; 1970 } 1971 1972 static Sg_request * 1973 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1974 { 1975 Sg_request *resp; 1976 unsigned long iflags; 1977 1978 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1979 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1980 /* look for requests that are ready + not SG_IO owned */ 1981 if ((1 == resp->done) && (!resp->sg_io_owned) && 1982 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1983 resp->done = 2; /* guard against other readers */ 1984 break; 1985 } 1986 } 1987 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1988 return resp; 1989 } 1990 1991 /* always adds to end of list */ 1992 static Sg_request * 1993 sg_add_request(Sg_fd * sfp) 1994 { 1995 int k; 1996 unsigned long iflags; 1997 Sg_request *resp; 1998 Sg_request *rp = sfp->req_arr; 1999 2000 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2001 resp = sfp->headrp; 2002 if (!resp) { 2003 memset(rp, 0, sizeof (Sg_request)); 2004 rp->parentfp = sfp; 2005 resp = rp; 2006 sfp->headrp = resp; 2007 } else { 2008 if (0 == sfp->cmd_q) 2009 resp = NULL; /* command queuing disallowed */ 2010 else { 2011 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2012 if (!rp->parentfp) 2013 break; 2014 } 2015 if (k < SG_MAX_QUEUE) { 2016 memset(rp, 0, sizeof (Sg_request)); 2017 rp->parentfp = sfp; 2018 while (resp->nextrp) 2019 resp = resp->nextrp; 2020 resp->nextrp = rp; 2021 resp = rp; 2022 } else 2023 resp = NULL; 2024 } 2025 } 2026 if (resp) { 2027 resp->nextrp = NULL; 2028 resp->header.duration = jiffies_to_msecs(jiffies); 2029 } 2030 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2031 return resp; 2032 } 2033 2034 /* Return of 1 for found; 0 for not found */ 2035 static int 2036 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2037 { 2038 Sg_request *prev_rp; 2039 Sg_request *rp; 2040 unsigned long iflags; 2041 int res = 0; 2042 2043 if ((!sfp) || (!srp) || (!sfp->headrp)) 2044 return res; 2045 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2046 prev_rp = sfp->headrp; 2047 if (srp == prev_rp) { 2048 sfp->headrp = prev_rp->nextrp; 2049 prev_rp->parentfp = NULL; 2050 res = 1; 2051 } else { 2052 while ((rp = prev_rp->nextrp)) { 2053 if (srp == rp) { 2054 prev_rp->nextrp = rp->nextrp; 2055 rp->parentfp = NULL; 2056 res = 1; 2057 break; 2058 } 2059 prev_rp = rp; 2060 } 2061 } 2062 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2063 return res; 2064 } 2065 2066 static Sg_fd * 2067 sg_add_sfp(Sg_device * sdp, int dev) 2068 { 2069 Sg_fd *sfp; 2070 unsigned long iflags; 2071 int bufflen; 2072 2073 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2074 if (!sfp) 2075 return NULL; 2076 2077 init_waitqueue_head(&sfp->read_wait); 2078 rwlock_init(&sfp->rq_list_lock); 2079 2080 kref_init(&sfp->f_ref); 2081 sfp->timeout = SG_DEFAULT_TIMEOUT; 2082 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2083 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2084 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2085 sdp->device->host->unchecked_isa_dma : 1; 2086 sfp->cmd_q = SG_DEF_COMMAND_Q; 2087 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2088 sfp->parentdp = sdp; 2089 write_lock_irqsave(&sg_index_lock, iflags); 2090 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2091 write_unlock_irqrestore(&sg_index_lock, iflags); 2092 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2093 if (unlikely(sg_big_buff != def_reserved_size)) 2094 sg_big_buff = def_reserved_size; 2095 2096 bufflen = min_t(int, sg_big_buff, 2097 queue_max_sectors(sdp->device->request_queue) * 512); 2098 sg_build_reserve(sfp, bufflen); 2099 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2100 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2101 2102 kref_get(&sdp->d_ref); 2103 __module_get(THIS_MODULE); 2104 return sfp; 2105 } 2106 2107 static void sg_remove_sfp_usercontext(struct work_struct *work) 2108 { 2109 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2110 struct sg_device *sdp = sfp->parentdp; 2111 2112 /* Cleanup any responses which were never read(). */ 2113 while (sfp->headrp) 2114 sg_finish_rem_req(sfp->headrp); 2115 2116 if (sfp->reserve.bufflen > 0) { 2117 SCSI_LOG_TIMEOUT(6, 2118 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2119 (int) sfp->reserve.bufflen, 2120 (int) sfp->reserve.k_use_sg)); 2121 sg_remove_scat(&sfp->reserve); 2122 } 2123 2124 SCSI_LOG_TIMEOUT(6, 2125 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2126 sdp->disk->disk_name, 2127 sfp)); 2128 kfree(sfp); 2129 2130 scsi_device_put(sdp->device); 2131 sg_put_dev(sdp); 2132 module_put(THIS_MODULE); 2133 } 2134 2135 static void sg_remove_sfp(struct kref *kref) 2136 { 2137 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2138 struct sg_device *sdp = sfp->parentdp; 2139 unsigned long iflags; 2140 2141 write_lock_irqsave(&sg_index_lock, iflags); 2142 list_del(&sfp->sfd_siblings); 2143 write_unlock_irqrestore(&sg_index_lock, iflags); 2144 wake_up_interruptible(&sdp->o_excl_wait); 2145 2146 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2147 schedule_work(&sfp->ew.work); 2148 } 2149 2150 static int 2151 sg_res_in_use(Sg_fd * sfp) 2152 { 2153 const Sg_request *srp; 2154 unsigned long iflags; 2155 2156 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2157 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2158 if (srp->res_used) 2159 break; 2160 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2161 return srp ? 1 : 0; 2162 } 2163 2164 #ifdef CONFIG_SCSI_PROC_FS 2165 static int 2166 sg_idr_max_id(int id, void *p, void *data) 2167 { 2168 int *k = data; 2169 2170 if (*k < id) 2171 *k = id; 2172 2173 return 0; 2174 } 2175 2176 static int 2177 sg_last_dev(void) 2178 { 2179 int k = -1; 2180 unsigned long iflags; 2181 2182 read_lock_irqsave(&sg_index_lock, iflags); 2183 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2184 read_unlock_irqrestore(&sg_index_lock, iflags); 2185 return k + 1; /* origin 1 */ 2186 } 2187 #endif 2188 2189 /* must be called with sg_index_lock held */ 2190 static Sg_device *sg_lookup_dev(int dev) 2191 { 2192 return idr_find(&sg_index_idr, dev); 2193 } 2194 2195 static Sg_device *sg_get_dev(int dev) 2196 { 2197 struct sg_device *sdp; 2198 unsigned long flags; 2199 2200 read_lock_irqsave(&sg_index_lock, flags); 2201 sdp = sg_lookup_dev(dev); 2202 if (!sdp) 2203 sdp = ERR_PTR(-ENXIO); 2204 else if (sdp->detached) { 2205 /* If sdp->detached, then the refcount may already be 0, in 2206 * which case it would be a bug to do kref_get(). 2207 */ 2208 sdp = ERR_PTR(-ENODEV); 2209 } else 2210 kref_get(&sdp->d_ref); 2211 read_unlock_irqrestore(&sg_index_lock, flags); 2212 2213 return sdp; 2214 } 2215 2216 static void sg_put_dev(struct sg_device *sdp) 2217 { 2218 kref_put(&sdp->d_ref, sg_device_destroy); 2219 } 2220 2221 #ifdef CONFIG_SCSI_PROC_FS 2222 2223 static struct proc_dir_entry *sg_proc_sgp = NULL; 2224 2225 static char sg_proc_sg_dirname[] = "scsi/sg"; 2226 2227 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2228 2229 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2230 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2231 size_t count, loff_t *off); 2232 static const struct file_operations adio_fops = { 2233 .owner = THIS_MODULE, 2234 .open = sg_proc_single_open_adio, 2235 .read = seq_read, 2236 .llseek = seq_lseek, 2237 .write = sg_proc_write_adio, 2238 .release = single_release, 2239 }; 2240 2241 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2242 static ssize_t sg_proc_write_dressz(struct file *filp, 2243 const char __user *buffer, size_t count, loff_t *off); 2244 static const struct file_operations dressz_fops = { 2245 .owner = THIS_MODULE, 2246 .open = sg_proc_single_open_dressz, 2247 .read = seq_read, 2248 .llseek = seq_lseek, 2249 .write = sg_proc_write_dressz, 2250 .release = single_release, 2251 }; 2252 2253 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2254 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2255 static const struct file_operations version_fops = { 2256 .owner = THIS_MODULE, 2257 .open = sg_proc_single_open_version, 2258 .read = seq_read, 2259 .llseek = seq_lseek, 2260 .release = single_release, 2261 }; 2262 2263 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2264 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2265 static const struct file_operations devhdr_fops = { 2266 .owner = THIS_MODULE, 2267 .open = sg_proc_single_open_devhdr, 2268 .read = seq_read, 2269 .llseek = seq_lseek, 2270 .release = single_release, 2271 }; 2272 2273 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2274 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2275 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2276 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2277 static void dev_seq_stop(struct seq_file *s, void *v); 2278 static const struct file_operations dev_fops = { 2279 .owner = THIS_MODULE, 2280 .open = sg_proc_open_dev, 2281 .read = seq_read, 2282 .llseek = seq_lseek, 2283 .release = seq_release, 2284 }; 2285 static const struct seq_operations dev_seq_ops = { 2286 .start = dev_seq_start, 2287 .next = dev_seq_next, 2288 .stop = dev_seq_stop, 2289 .show = sg_proc_seq_show_dev, 2290 }; 2291 2292 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2293 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2294 static const struct file_operations devstrs_fops = { 2295 .owner = THIS_MODULE, 2296 .open = sg_proc_open_devstrs, 2297 .read = seq_read, 2298 .llseek = seq_lseek, 2299 .release = seq_release, 2300 }; 2301 static const struct seq_operations devstrs_seq_ops = { 2302 .start = dev_seq_start, 2303 .next = dev_seq_next, 2304 .stop = dev_seq_stop, 2305 .show = sg_proc_seq_show_devstrs, 2306 }; 2307 2308 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2309 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2310 static const struct file_operations debug_fops = { 2311 .owner = THIS_MODULE, 2312 .open = sg_proc_open_debug, 2313 .read = seq_read, 2314 .llseek = seq_lseek, 2315 .release = seq_release, 2316 }; 2317 static const struct seq_operations debug_seq_ops = { 2318 .start = dev_seq_start, 2319 .next = dev_seq_next, 2320 .stop = dev_seq_stop, 2321 .show = sg_proc_seq_show_debug, 2322 }; 2323 2324 2325 struct sg_proc_leaf { 2326 const char * name; 2327 const struct file_operations * fops; 2328 }; 2329 2330 static const struct sg_proc_leaf sg_proc_leaf_arr[] = { 2331 {"allow_dio", &adio_fops}, 2332 {"debug", &debug_fops}, 2333 {"def_reserved_size", &dressz_fops}, 2334 {"device_hdr", &devhdr_fops}, 2335 {"devices", &dev_fops}, 2336 {"device_strs", &devstrs_fops}, 2337 {"version", &version_fops} 2338 }; 2339 2340 static int 2341 sg_proc_init(void) 2342 { 2343 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2344 int k; 2345 2346 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2347 if (!sg_proc_sgp) 2348 return 1; 2349 for (k = 0; k < num_leaves; ++k) { 2350 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2351 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2352 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2353 } 2354 return 0; 2355 } 2356 2357 static void 2358 sg_proc_cleanup(void) 2359 { 2360 int k; 2361 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2362 2363 if (!sg_proc_sgp) 2364 return; 2365 for (k = 0; k < num_leaves; ++k) 2366 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2367 remove_proc_entry(sg_proc_sg_dirname, NULL); 2368 } 2369 2370 2371 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2372 { 2373 seq_printf(s, "%d\n", *((int *)s->private)); 2374 return 0; 2375 } 2376 2377 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2378 { 2379 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2380 } 2381 2382 static ssize_t 2383 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2384 size_t count, loff_t *off) 2385 { 2386 int err; 2387 unsigned long num; 2388 2389 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2390 return -EACCES; 2391 err = kstrtoul_from_user(buffer, count, 0, &num); 2392 if (err) 2393 return err; 2394 sg_allow_dio = num ? 1 : 0; 2395 return count; 2396 } 2397 2398 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2399 { 2400 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2401 } 2402 2403 static ssize_t 2404 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2405 size_t count, loff_t *off) 2406 { 2407 int err; 2408 unsigned long k = ULONG_MAX; 2409 2410 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2411 return -EACCES; 2412 2413 err = kstrtoul_from_user(buffer, count, 0, &k); 2414 if (err) 2415 return err; 2416 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2417 sg_big_buff = k; 2418 return count; 2419 } 2420 return -ERANGE; 2421 } 2422 2423 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2424 { 2425 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2426 sg_version_date); 2427 return 0; 2428 } 2429 2430 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2431 { 2432 return single_open(file, sg_proc_seq_show_version, NULL); 2433 } 2434 2435 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2436 { 2437 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2438 "online\n"); 2439 return 0; 2440 } 2441 2442 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2443 { 2444 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2445 } 2446 2447 struct sg_proc_deviter { 2448 loff_t index; 2449 size_t max; 2450 }; 2451 2452 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2453 { 2454 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2455 2456 s->private = it; 2457 if (! it) 2458 return NULL; 2459 2460 it->index = *pos; 2461 it->max = sg_last_dev(); 2462 if (it->index >= it->max) 2463 return NULL; 2464 return it; 2465 } 2466 2467 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2468 { 2469 struct sg_proc_deviter * it = s->private; 2470 2471 *pos = ++it->index; 2472 return (it->index < it->max) ? it : NULL; 2473 } 2474 2475 static void dev_seq_stop(struct seq_file *s, void *v) 2476 { 2477 kfree(s->private); 2478 } 2479 2480 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2481 { 2482 return seq_open(file, &dev_seq_ops); 2483 } 2484 2485 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2486 { 2487 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2488 Sg_device *sdp; 2489 struct scsi_device *scsidp; 2490 unsigned long iflags; 2491 2492 read_lock_irqsave(&sg_index_lock, iflags); 2493 sdp = it ? sg_lookup_dev(it->index) : NULL; 2494 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2495 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2496 scsidp->host->host_no, scsidp->channel, 2497 scsidp->id, scsidp->lun, (int) scsidp->type, 2498 1, 2499 (int) scsidp->queue_depth, 2500 (int) scsidp->device_busy, 2501 (int) scsi_device_online(scsidp)); 2502 else 2503 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2504 read_unlock_irqrestore(&sg_index_lock, iflags); 2505 return 0; 2506 } 2507 2508 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2509 { 2510 return seq_open(file, &devstrs_seq_ops); 2511 } 2512 2513 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2514 { 2515 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2516 Sg_device *sdp; 2517 struct scsi_device *scsidp; 2518 unsigned long iflags; 2519 2520 read_lock_irqsave(&sg_index_lock, iflags); 2521 sdp = it ? sg_lookup_dev(it->index) : NULL; 2522 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2523 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2524 scsidp->vendor, scsidp->model, scsidp->rev); 2525 else 2526 seq_printf(s, "<no active device>\n"); 2527 read_unlock_irqrestore(&sg_index_lock, iflags); 2528 return 0; 2529 } 2530 2531 /* must be called while holding sg_index_lock */ 2532 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2533 { 2534 int k, m, new_interface, blen, usg; 2535 Sg_request *srp; 2536 Sg_fd *fp; 2537 const sg_io_hdr_t *hp; 2538 const char * cp; 2539 unsigned int ms; 2540 2541 k = 0; 2542 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2543 k++; 2544 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2545 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2546 "(res)sgat=%d low_dma=%d\n", k, 2547 jiffies_to_msecs(fp->timeout), 2548 fp->reserve.bufflen, 2549 (int) fp->reserve.k_use_sg, 2550 (int) fp->low_dma); 2551 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", 2552 (int) fp->cmd_q, (int) fp->force_packid, 2553 (int) fp->keep_orphan); 2554 for (m = 0, srp = fp->headrp; 2555 srp != NULL; 2556 ++m, srp = srp->nextrp) { 2557 hp = &srp->header; 2558 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2559 if (srp->res_used) { 2560 if (new_interface && 2561 (SG_FLAG_MMAP_IO & hp->flags)) 2562 cp = " mmap>> "; 2563 else 2564 cp = " rb>> "; 2565 } else { 2566 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2567 cp = " dio>> "; 2568 else 2569 cp = " "; 2570 } 2571 seq_printf(s, cp); 2572 blen = srp->data.bufflen; 2573 usg = srp->data.k_use_sg; 2574 seq_printf(s, srp->done ? 2575 ((1 == srp->done) ? "rcv:" : "fin:") 2576 : "act:"); 2577 seq_printf(s, " id=%d blen=%d", 2578 srp->header.pack_id, blen); 2579 if (srp->done) 2580 seq_printf(s, " dur=%d", hp->duration); 2581 else { 2582 ms = jiffies_to_msecs(jiffies); 2583 seq_printf(s, " t_o/elap=%d/%d", 2584 (new_interface ? hp->timeout : 2585 jiffies_to_msecs(fp->timeout)), 2586 (ms > hp->duration ? ms - hp->duration : 0)); 2587 } 2588 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2589 (int) srp->data.cmd_opcode); 2590 } 2591 if (0 == m) 2592 seq_printf(s, " No requests active\n"); 2593 read_unlock(&fp->rq_list_lock); 2594 } 2595 } 2596 2597 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2598 { 2599 return seq_open(file, &debug_seq_ops); 2600 } 2601 2602 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2603 { 2604 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2605 Sg_device *sdp; 2606 unsigned long iflags; 2607 2608 if (it && (0 == it->index)) { 2609 seq_printf(s, "max_active_device=%d(origin 1)\n", 2610 (int)it->max); 2611 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2612 } 2613 2614 read_lock_irqsave(&sg_index_lock, iflags); 2615 sdp = it ? sg_lookup_dev(it->index) : NULL; 2616 if (sdp && !list_empty(&sdp->sfds)) { 2617 struct scsi_device *scsidp = sdp->device; 2618 2619 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2620 if (sdp->detached) 2621 seq_printf(s, "detached pending close "); 2622 else 2623 seq_printf 2624 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2625 scsidp->host->host_no, 2626 scsidp->channel, scsidp->id, 2627 scsidp->lun, 2628 scsidp->host->hostt->emulated); 2629 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2630 sdp->sg_tablesize, get_exclude(sdp)); 2631 sg_proc_debug_helper(s, sdp); 2632 } 2633 read_unlock_irqrestore(&sg_index_lock, iflags); 2634 return 0; 2635 } 2636 2637 #endif /* CONFIG_SCSI_PROC_FS */ 2638 2639 module_init(init_sg); 2640 module_exit(exit_sg); 2641