1 /* 2 * (MPSAFE) 3 * 4 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 5 * 6 * This code is derived from software contributed to The DragonFly Project 7 * by Alex Hornung <ahornung@gmail.com> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 3. Neither the name of The DragonFly Project nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific, prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/time.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/fcntl.h> 42 #include <sys/proc.h> 43 #include <sys/priv.h> 44 #include <sys/signalvar.h> 45 #include <sys/vnode.h> 46 #include <sys/uio.h> 47 #include <sys/mount.h> 48 #include <sys/file.h> 49 #include <sys/fcntl.h> 50 #include <sys/namei.h> 51 #include <sys/dirent.h> 52 #include <sys/malloc.h> 53 #include <sys/stat.h> 54 #include <sys/reg.h> 55 #include <vm/vm_pager.h> 56 #include <vm/vm_zone.h> 57 #include <vm/vm_object.h> 58 #include <sys/filio.h> 59 #include <sys/ttycom.h> 60 #include <sys/tty.h> 61 #include <sys/diskslice.h> 62 #include <sys/sysctl.h> 63 #include <sys/devfs.h> 64 #include <sys/pioctl.h> 65 #include <vfs/fifofs/fifo.h> 66 67 #include <machine/limits.h> 68 69 #include <sys/buf2.h> 70 #include <sys/sysref2.h> 71 #include <sys/mplock2.h> 72 #include <vm/vm_page2.h> 73 74 MALLOC_DECLARE(M_DEVFS); 75 #define DEVFS_BADOP (void *)devfs_vop_badop 76 77 static int devfs_vop_badop(struct vop_generic_args *); 78 static int devfs_vop_access(struct vop_access_args *); 79 static int devfs_vop_inactive(struct vop_inactive_args *); 80 static int devfs_vop_reclaim(struct vop_reclaim_args *); 81 static int devfs_vop_readdir(struct vop_readdir_args *); 82 static int devfs_vop_getattr(struct vop_getattr_args *); 83 static int devfs_vop_setattr(struct vop_setattr_args *); 84 static int devfs_vop_readlink(struct vop_readlink_args *); 85 static int devfs_vop_print(struct vop_print_args *); 86 87 static int devfs_vop_nresolve(struct vop_nresolve_args *); 88 static int devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); 89 static int devfs_vop_nmkdir(struct vop_nmkdir_args *); 90 static int devfs_vop_nsymlink(struct vop_nsymlink_args *); 91 static int devfs_vop_nrmdir(struct vop_nrmdir_args *); 92 static int devfs_vop_nremove(struct vop_nremove_args *); 93 94 static int devfs_spec_open(struct vop_open_args *); 95 static int devfs_spec_close(struct vop_close_args *); 96 static int devfs_spec_fsync(struct vop_fsync_args *); 97 98 static int devfs_spec_read(struct vop_read_args *); 99 static int devfs_spec_write(struct vop_write_args *); 100 static int devfs_spec_ioctl(struct vop_ioctl_args *); 101 static int devfs_spec_kqfilter(struct vop_kqfilter_args *); 102 static int devfs_spec_strategy(struct vop_strategy_args *); 103 static void devfs_spec_strategy_done(struct bio *); 104 static int devfs_spec_freeblks(struct vop_freeblks_args *); 105 static int devfs_spec_bmap(struct vop_bmap_args *); 106 static int devfs_spec_advlock(struct vop_advlock_args *); 107 static void devfs_spec_getpages_iodone(struct bio *); 108 static int devfs_spec_getpages(struct vop_getpages_args *); 109 110 static int devfs_fo_close(struct file *); 111 static int devfs_fo_read(struct file *, struct uio *, struct ucred *, int); 112 static int devfs_fo_write(struct file *, struct uio *, struct ucred *, int); 113 static int devfs_fo_stat(struct file *, struct stat *, struct ucred *); 114 static int devfs_fo_kqfilter(struct file *, struct knote *); 115 static int devfs_fo_ioctl(struct file *, u_long, caddr_t, 116 struct ucred *, struct sysmsg *); 117 static __inline int sequential_heuristic(struct uio *, struct file *); 118 119 extern struct lock devfs_lock; 120 121 /* 122 * devfs vnode operations for regular files. All vnode ops are MPSAFE. 123 */ 124 struct vop_ops devfs_vnode_norm_vops = { 125 .vop_default = vop_defaultop, 126 .vop_access = devfs_vop_access, 127 .vop_advlock = DEVFS_BADOP, 128 .vop_bmap = DEVFS_BADOP, 129 .vop_close = vop_stdclose, 130 .vop_getattr = devfs_vop_getattr, 131 .vop_inactive = devfs_vop_inactive, 132 .vop_ncreate = DEVFS_BADOP, 133 .vop_nresolve = devfs_vop_nresolve, 134 .vop_nlookupdotdot = devfs_vop_nlookupdotdot, 135 .vop_nlink = DEVFS_BADOP, 136 .vop_nmkdir = devfs_vop_nmkdir, 137 .vop_nmknod = DEVFS_BADOP, 138 .vop_nremove = devfs_vop_nremove, 139 .vop_nrename = DEVFS_BADOP, 140 .vop_nrmdir = devfs_vop_nrmdir, 141 .vop_nsymlink = devfs_vop_nsymlink, 142 .vop_open = vop_stdopen, 143 .vop_pathconf = vop_stdpathconf, 144 .vop_print = devfs_vop_print, 145 .vop_read = DEVFS_BADOP, 146 .vop_readdir = devfs_vop_readdir, 147 .vop_readlink = devfs_vop_readlink, 148 .vop_reclaim = devfs_vop_reclaim, 149 .vop_setattr = devfs_vop_setattr, 150 .vop_write = DEVFS_BADOP, 151 .vop_ioctl = DEVFS_BADOP 152 }; 153 154 /* 155 * devfs vnode operations for character devices. All vnode ops are MPSAFE. 156 */ 157 struct vop_ops devfs_vnode_dev_vops = { 158 .vop_default = vop_defaultop, 159 .vop_access = devfs_vop_access, 160 .vop_advlock = devfs_spec_advlock, 161 .vop_bmap = devfs_spec_bmap, 162 .vop_close = devfs_spec_close, 163 .vop_freeblks = devfs_spec_freeblks, 164 .vop_fsync = devfs_spec_fsync, 165 .vop_getattr = devfs_vop_getattr, 166 .vop_getpages = devfs_spec_getpages, 167 .vop_inactive = devfs_vop_inactive, 168 .vop_open = devfs_spec_open, 169 .vop_pathconf = vop_stdpathconf, 170 .vop_print = devfs_vop_print, 171 .vop_kqfilter = devfs_spec_kqfilter, 172 .vop_read = devfs_spec_read, 173 .vop_readdir = DEVFS_BADOP, 174 .vop_readlink = DEVFS_BADOP, 175 .vop_reclaim = devfs_vop_reclaim, 176 .vop_setattr = devfs_vop_setattr, 177 .vop_strategy = devfs_spec_strategy, 178 .vop_write = devfs_spec_write, 179 .vop_ioctl = devfs_spec_ioctl 180 }; 181 182 /* 183 * devfs file pointer operations. All fileops are MPSAFE. 184 */ 185 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops; 186 187 struct fileops devfs_dev_fileops = { 188 .fo_read = devfs_fo_read, 189 .fo_write = devfs_fo_write, 190 .fo_ioctl = devfs_fo_ioctl, 191 .fo_kqfilter = devfs_fo_kqfilter, 192 .fo_stat = devfs_fo_stat, 193 .fo_close = devfs_fo_close, 194 .fo_shutdown = nofo_shutdown 195 }; 196 197 /* 198 * These two functions are possibly temporary hacks for devices (aka 199 * the pty code) which want to control the node attributes themselves. 200 * 201 * XXX we may ultimately desire to simply remove the uid/gid/mode 202 * from the node entirely. 203 * 204 * MPSAFE - sorta. Theoretically the overwrite can compete since they 205 * are loading from the same fields. 206 */ 207 static __inline void 208 node_sync_dev_get(struct devfs_node *node) 209 { 210 cdev_t dev; 211 212 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) { 213 node->uid = dev->si_uid; 214 node->gid = dev->si_gid; 215 node->mode = dev->si_perms; 216 } 217 } 218 219 static __inline void 220 node_sync_dev_set(struct devfs_node *node) 221 { 222 cdev_t dev; 223 224 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) { 225 dev->si_uid = node->uid; 226 dev->si_gid = node->gid; 227 dev->si_perms = node->mode; 228 } 229 } 230 231 /* 232 * generic entry point for unsupported operations 233 */ 234 static int 235 devfs_vop_badop(struct vop_generic_args *ap) 236 { 237 return (EIO); 238 } 239 240 241 static int 242 devfs_vop_access(struct vop_access_args *ap) 243 { 244 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 245 int error; 246 247 if (!devfs_node_is_accessible(node)) 248 return ENOENT; 249 node_sync_dev_get(node); 250 error = vop_helper_access(ap, node->uid, node->gid, 251 node->mode, node->flags); 252 253 return error; 254 } 255 256 257 static int 258 devfs_vop_inactive(struct vop_inactive_args *ap) 259 { 260 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 261 262 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0) 263 vrecycle(ap->a_vp); 264 return 0; 265 } 266 267 268 static int 269 devfs_vop_reclaim(struct vop_reclaim_args *ap) 270 { 271 struct devfs_node *node; 272 struct vnode *vp; 273 int locked; 274 275 /* 276 * Check if it is locked already. if not, we acquire the devfs lock 277 */ 278 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) { 279 lockmgr(&devfs_lock, LK_EXCLUSIVE); 280 locked = 1; 281 } else { 282 locked = 0; 283 } 284 285 /* 286 * Get rid of the devfs_node if it is no longer linked into the 287 * topology. 288 */ 289 vp = ap->a_vp; 290 if ((node = DEVFS_NODE(vp)) != NULL) { 291 node->v_node = NULL; 292 if ((node->flags & DEVFS_NODE_LINKED) == 0) 293 devfs_freep(node); 294 } 295 296 if (locked) 297 lockmgr(&devfs_lock, LK_RELEASE); 298 299 /* 300 * v_rdev needs to be properly released using v_release_rdev 301 * Make sure v_data is NULL as well. 302 */ 303 vp->v_data = NULL; 304 v_release_rdev(vp); 305 return 0; 306 } 307 308 309 static int 310 devfs_vop_readdir(struct vop_readdir_args *ap) 311 { 312 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp); 313 struct devfs_node *node; 314 int cookie_index; 315 int ncookies; 316 int error2; 317 int error; 318 int r; 319 off_t *cookies; 320 off_t saveoff; 321 322 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n"); 323 324 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX) 325 return (EINVAL); 326 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 327 return (error); 328 329 if (!devfs_node_is_accessible(dnode)) { 330 vn_unlock(ap->a_vp); 331 return ENOENT; 332 } 333 334 lockmgr(&devfs_lock, LK_EXCLUSIVE); 335 336 saveoff = ap->a_uio->uio_offset; 337 338 if (ap->a_ncookies) { 339 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */ 340 if (ncookies > 256) 341 ncookies = 256; 342 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK); 343 cookie_index = 0; 344 } else { 345 ncookies = -1; 346 cookies = NULL; 347 cookie_index = 0; 348 } 349 350 nanotime(&dnode->atime); 351 352 if (saveoff == 0) { 353 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino, 354 DT_DIR, 1, "."); 355 if (r) 356 goto done; 357 if (cookies) 358 cookies[cookie_index] = saveoff; 359 saveoff++; 360 cookie_index++; 361 if (cookie_index == ncookies) 362 goto done; 363 } 364 365 if (saveoff == 1) { 366 if (dnode->parent) { 367 r = vop_write_dirent(&error, ap->a_uio, 368 dnode->parent->d_dir.d_ino, 369 DT_DIR, 2, ".."); 370 } else { 371 r = vop_write_dirent(&error, ap->a_uio, 372 dnode->d_dir.d_ino, 373 DT_DIR, 2, ".."); 374 } 375 if (r) 376 goto done; 377 if (cookies) 378 cookies[cookie_index] = saveoff; 379 saveoff++; 380 cookie_index++; 381 if (cookie_index == ncookies) 382 goto done; 383 } 384 385 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 386 if ((node->flags & DEVFS_HIDDEN) || 387 (node->flags & DEVFS_INVISIBLE)) { 388 continue; 389 } 390 391 /* 392 * If the node type is a valid devfs alias, then we make 393 * sure that the target isn't hidden. If it is, we don't 394 * show the link in the directory listing. 395 */ 396 if ((node->node_type == Plink) && (node->link_target != NULL) && 397 (node->link_target->flags & DEVFS_HIDDEN)) 398 continue; 399 400 if (node->cookie < saveoff) 401 continue; 402 403 saveoff = node->cookie; 404 405 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino, 406 node->d_dir.d_type, 407 node->d_dir.d_namlen, 408 node->d_dir.d_name); 409 410 if (error2) 411 break; 412 413 saveoff++; 414 415 if (cookies) 416 cookies[cookie_index] = node->cookie; 417 ++cookie_index; 418 if (cookie_index == ncookies) 419 break; 420 } 421 422 done: 423 lockmgr(&devfs_lock, LK_RELEASE); 424 vn_unlock(ap->a_vp); 425 426 ap->a_uio->uio_offset = saveoff; 427 if (error && cookie_index == 0) { 428 if (cookies) { 429 kfree(cookies, M_TEMP); 430 *ap->a_ncookies = 0; 431 *ap->a_cookies = NULL; 432 } 433 } else { 434 if (cookies) { 435 *ap->a_ncookies = cookie_index; 436 *ap->a_cookies = cookies; 437 } 438 } 439 return (error); 440 } 441 442 443 static int 444 devfs_vop_nresolve(struct vop_nresolve_args *ap) 445 { 446 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 447 struct devfs_node *node, *found = NULL; 448 struct namecache *ncp; 449 struct vnode *vp = NULL; 450 int error = 0; 451 int len; 452 int depth; 453 454 ncp = ap->a_nch->ncp; 455 len = ncp->nc_nlen; 456 457 if (!devfs_node_is_accessible(dnode)) 458 return ENOENT; 459 460 lockmgr(&devfs_lock, LK_EXCLUSIVE); 461 462 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) { 463 error = ENOENT; 464 cache_setvp(ap->a_nch, NULL); 465 goto out; 466 } 467 468 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 469 if (len == node->d_dir.d_namlen) { 470 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) { 471 found = node; 472 break; 473 } 474 } 475 } 476 477 if (found) { 478 depth = 0; 479 while ((found->node_type == Plink) && (found->link_target)) { 480 if (depth >= 8) { 481 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8"); 482 break; 483 } 484 485 found = found->link_target; 486 ++depth; 487 } 488 489 if (!(found->flags & DEVFS_HIDDEN)) 490 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp, found); 491 } 492 493 if (vp == NULL) { 494 error = ENOENT; 495 cache_setvp(ap->a_nch, NULL); 496 goto out; 497 498 } 499 KKASSERT(vp); 500 vn_unlock(vp); 501 cache_setvp(ap->a_nch, vp); 502 vrele(vp); 503 out: 504 lockmgr(&devfs_lock, LK_RELEASE); 505 506 return error; 507 } 508 509 510 static int 511 devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 512 { 513 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 514 515 *ap->a_vpp = NULL; 516 if (!devfs_node_is_accessible(dnode)) 517 return ENOENT; 518 519 lockmgr(&devfs_lock, LK_EXCLUSIVE); 520 if (dnode->parent != NULL) { 521 devfs_allocv(ap->a_vpp, dnode->parent); 522 vn_unlock(*ap->a_vpp); 523 } 524 lockmgr(&devfs_lock, LK_RELEASE); 525 526 return ((*ap->a_vpp == NULL) ? ENOENT : 0); 527 } 528 529 530 static int 531 devfs_vop_getattr(struct vop_getattr_args *ap) 532 { 533 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 534 struct vattr *vap = ap->a_vap; 535 struct partinfo pinfo; 536 int error = 0; 537 538 #if 0 539 if (!devfs_node_is_accessible(node)) 540 return ENOENT; 541 #endif 542 node_sync_dev_get(node); 543 544 lockmgr(&devfs_lock, LK_EXCLUSIVE); 545 546 /* start by zeroing out the attributes */ 547 VATTR_NULL(vap); 548 549 /* next do all the common fields */ 550 vap->va_type = ap->a_vp->v_type; 551 vap->va_mode = node->mode; 552 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ; 553 vap->va_flags = 0; 554 vap->va_blocksize = DEV_BSIZE; 555 vap->va_bytes = vap->va_size = 0; 556 557 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; 558 559 vap->va_atime = node->atime; 560 vap->va_mtime = node->mtime; 561 vap->va_ctime = node->ctime; 562 563 vap->va_nlink = 1; /* number of references to file */ 564 565 vap->va_uid = node->uid; 566 vap->va_gid = node->gid; 567 568 vap->va_rmajor = 0; 569 vap->va_rminor = 0; 570 571 if ((node->node_type == Pdev) && node->d_dev) { 572 reference_dev(node->d_dev); 573 vap->va_rminor = node->d_dev->si_uminor; 574 release_dev(node->d_dev); 575 } 576 577 /* For a softlink the va_size is the length of the softlink */ 578 if (node->symlink_name != 0) { 579 vap->va_bytes = vap->va_size = node->symlink_namelen; 580 } 581 582 /* 583 * For a disk-type device, va_size is the size of the underlying 584 * device, so that lseek() works properly. 585 */ 586 if ((node->d_dev) && (dev_dflags(node->d_dev) & D_DISK)) { 587 bzero(&pinfo, sizeof(pinfo)); 588 error = dev_dioctl(node->d_dev, DIOCGPART, (void *)&pinfo, 589 0, proc0.p_ucred, NULL); 590 if ((error == 0) && (pinfo.media_blksize != 0)) { 591 vap->va_size = pinfo.media_size; 592 } else { 593 vap->va_size = 0; 594 error = 0; 595 } 596 } 597 598 lockmgr(&devfs_lock, LK_RELEASE); 599 600 return (error); 601 } 602 603 604 static int 605 devfs_vop_setattr(struct vop_setattr_args *ap) 606 { 607 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 608 struct vattr *vap; 609 uid_t cur_uid; 610 gid_t cur_gid; 611 mode_t cur_mode; 612 int error = 0; 613 614 if (!devfs_node_is_accessible(node)) 615 return ENOENT; 616 node_sync_dev_get(node); 617 618 lockmgr(&devfs_lock, LK_EXCLUSIVE); 619 620 vap = ap->a_vap; 621 622 if ((vap->va_uid != (uid_t)VNOVAL) || (vap->va_gid != (gid_t)VNOVAL)) { 623 cur_uid = node->uid; 624 cur_gid = node->gid; 625 cur_mode = node->mode; 626 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 627 ap->a_cred, &cur_uid, &cur_gid, &cur_mode); 628 if (error) 629 goto out; 630 631 if (node->uid != cur_uid || node->gid != cur_gid) { 632 node->uid = cur_uid; 633 node->gid = cur_gid; 634 node->mode = cur_mode; 635 } 636 } 637 638 if (vap->va_mode != (mode_t)VNOVAL) { 639 cur_mode = node->mode; 640 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 641 node->uid, node->gid, &cur_mode); 642 if (error == 0 && node->mode != cur_mode) { 643 node->mode = cur_mode; 644 } 645 } 646 647 out: 648 node_sync_dev_set(node); 649 nanotime(&node->ctime); 650 lockmgr(&devfs_lock, LK_RELEASE); 651 652 return error; 653 } 654 655 656 static int 657 devfs_vop_readlink(struct vop_readlink_args *ap) 658 { 659 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 660 int ret; 661 662 if (!devfs_node_is_accessible(node)) 663 return ENOENT; 664 665 lockmgr(&devfs_lock, LK_EXCLUSIVE); 666 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio); 667 lockmgr(&devfs_lock, LK_RELEASE); 668 669 return ret; 670 } 671 672 673 static int 674 devfs_vop_print(struct vop_print_args *ap) 675 { 676 return (0); 677 } 678 679 static int 680 devfs_vop_nmkdir(struct vop_nmkdir_args *ap) 681 { 682 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 683 struct devfs_node *node; 684 685 if (!devfs_node_is_accessible(dnode)) 686 return ENOENT; 687 688 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 689 goto out; 690 691 lockmgr(&devfs_lock, LK_EXCLUSIVE); 692 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Pdir, 693 ap->a_nch->ncp->nc_name, dnode, NULL); 694 695 if (*ap->a_vpp) { 696 node = DEVFS_NODE(*ap->a_vpp); 697 node->flags |= DEVFS_USER_CREATED; 698 cache_setunresolved(ap->a_nch); 699 cache_setvp(ap->a_nch, *ap->a_vpp); 700 } 701 lockmgr(&devfs_lock, LK_RELEASE); 702 out: 703 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 704 } 705 706 static int 707 devfs_vop_nsymlink(struct vop_nsymlink_args *ap) 708 { 709 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 710 struct devfs_node *node; 711 size_t targetlen; 712 713 if (!devfs_node_is_accessible(dnode)) 714 return ENOENT; 715 716 ap->a_vap->va_type = VLNK; 717 718 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 719 goto out; 720 721 lockmgr(&devfs_lock, LK_EXCLUSIVE); 722 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Plink, 723 ap->a_nch->ncp->nc_name, dnode, NULL); 724 725 targetlen = strlen(ap->a_target); 726 if (*ap->a_vpp) { 727 node = DEVFS_NODE(*ap->a_vpp); 728 node->flags |= DEVFS_USER_CREATED; 729 node->symlink_namelen = targetlen; 730 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK); 731 memcpy(node->symlink_name, ap->a_target, targetlen); 732 node->symlink_name[targetlen] = '\0'; 733 cache_setunresolved(ap->a_nch); 734 cache_setvp(ap->a_nch, *ap->a_vpp); 735 } 736 lockmgr(&devfs_lock, LK_RELEASE); 737 out: 738 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 739 } 740 741 static int 742 devfs_vop_nrmdir(struct vop_nrmdir_args *ap) 743 { 744 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 745 struct devfs_node *node; 746 struct namecache *ncp; 747 int error = ENOENT; 748 749 ncp = ap->a_nch->ncp; 750 751 if (!devfs_node_is_accessible(dnode)) 752 return ENOENT; 753 754 lockmgr(&devfs_lock, LK_EXCLUSIVE); 755 756 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 757 goto out; 758 759 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 760 if (ncp->nc_nlen != node->d_dir.d_namlen) 761 continue; 762 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 763 continue; 764 765 /* 766 * only allow removal of user created dirs 767 */ 768 if ((node->flags & DEVFS_USER_CREATED) == 0) { 769 error = EPERM; 770 goto out; 771 } else if (node->node_type != Pdir) { 772 error = ENOTDIR; 773 goto out; 774 } else if (node->nchildren > 2) { 775 error = ENOTEMPTY; 776 goto out; 777 } else { 778 if (node->v_node) 779 cache_inval_vp(node->v_node, CINV_DESTROY); 780 devfs_unlinkp(node); 781 error = 0; 782 break; 783 } 784 } 785 786 cache_setunresolved(ap->a_nch); 787 cache_setvp(ap->a_nch, NULL); 788 789 out: 790 lockmgr(&devfs_lock, LK_RELEASE); 791 return error; 792 } 793 794 static int 795 devfs_vop_nremove(struct vop_nremove_args *ap) 796 { 797 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 798 struct devfs_node *node; 799 struct namecache *ncp; 800 int error = ENOENT; 801 802 ncp = ap->a_nch->ncp; 803 804 if (!devfs_node_is_accessible(dnode)) 805 return ENOENT; 806 807 lockmgr(&devfs_lock, LK_EXCLUSIVE); 808 809 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 810 goto out; 811 812 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 813 if (ncp->nc_nlen != node->d_dir.d_namlen) 814 continue; 815 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 816 continue; 817 818 /* 819 * only allow removal of user created stuff (e.g. symlinks) 820 */ 821 if ((node->flags & DEVFS_USER_CREATED) == 0) { 822 error = EPERM; 823 goto out; 824 } else if (node->node_type == Pdir) { 825 error = EISDIR; 826 goto out; 827 } else { 828 if (node->v_node) 829 cache_inval_vp(node->v_node, CINV_DESTROY); 830 devfs_unlinkp(node); 831 error = 0; 832 break; 833 } 834 } 835 836 cache_setunresolved(ap->a_nch); 837 cache_setvp(ap->a_nch, NULL); 838 839 out: 840 lockmgr(&devfs_lock, LK_RELEASE); 841 return error; 842 } 843 844 845 static int 846 devfs_spec_open(struct vop_open_args *ap) 847 { 848 struct vnode *vp = ap->a_vp; 849 struct vnode *orig_vp = NULL; 850 struct devfs_node *node = DEVFS_NODE(vp); 851 struct devfs_node *newnode; 852 cdev_t dev, ndev = NULL; 853 int error = 0; 854 855 if (node) { 856 if (node->d_dev == NULL) 857 return ENXIO; 858 if (!devfs_node_is_accessible(node)) 859 return ENOENT; 860 } 861 862 if ((dev = vp->v_rdev) == NULL) 863 return ENXIO; 864 865 if (node && ap->a_fp) { 866 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n"); 867 lockmgr(&devfs_lock, LK_EXCLUSIVE); 868 869 ndev = devfs_clone(dev, node->d_dir.d_name, node->d_dir.d_namlen, 870 ap->a_mode, ap->a_cred); 871 if (ndev != NULL) { 872 newnode = devfs_create_device_node( 873 DEVFS_MNTDATA(vp->v_mount)->root_node, 874 ndev, NULL, NULL); 875 /* XXX: possibly destroy device if this happens */ 876 877 if (newnode != NULL) { 878 dev = ndev; 879 devfs_link_dev(dev); 880 881 devfs_debug(DEVFS_DEBUG_DEBUG, 882 "parent here is: %s, node is: |%s|\n", 883 ((node->parent->node_type == Proot) ? 884 "ROOT!" : node->parent->d_dir.d_name), 885 newnode->d_dir.d_name); 886 devfs_debug(DEVFS_DEBUG_DEBUG, 887 "test: %s\n", 888 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name); 889 890 /* 891 * orig_vp is set to the original vp if we cloned. 892 */ 893 /* node->flags |= DEVFS_CLONED; */ 894 devfs_allocv(&vp, newnode); 895 orig_vp = ap->a_vp; 896 ap->a_vp = vp; 897 } 898 } 899 lockmgr(&devfs_lock, LK_RELEASE); 900 } 901 902 devfs_debug(DEVFS_DEBUG_DEBUG, 903 "devfs_spec_open() called on %s! \n", 904 dev->si_name); 905 906 /* 907 * Make this field valid before any I/O in ->d_open 908 */ 909 if (!dev->si_iosize_max) 910 dev->si_iosize_max = DFLTPHYS; 911 912 if (dev_dflags(dev) & D_TTY) 913 vsetflags(vp, VISTTY); 914 915 /* 916 * Open underlying device 917 */ 918 vn_unlock(vp); 919 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred); 920 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 921 922 /* 923 * Clean up any cloned vp if we error out. 924 */ 925 if (error) { 926 if (orig_vp) { 927 vput(vp); 928 ap->a_vp = orig_vp; 929 /* orig_vp = NULL; */ 930 } 931 return error; 932 } 933 934 /* 935 * This checks if the disk device is going to be opened for writing. 936 * It will be only allowed in the cases where securelevel permits it 937 * and it's not mounted R/W. 938 */ 939 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) && 940 (ap->a_cred != FSCRED)) { 941 942 /* Very secure mode. No open for writing allowed */ 943 if (securelevel >= 2) 944 return EPERM; 945 946 /* 947 * If it is mounted R/W, do not allow to open for writing. 948 * In the case it's mounted read-only but securelevel 949 * is >= 1, then do not allow opening for writing either. 950 */ 951 if (vfs_mountedon(vp)) { 952 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY)) 953 return EBUSY; 954 else if (securelevel >= 1) 955 return EPERM; 956 } 957 } 958 959 if (dev_dflags(dev) & D_TTY) { 960 if (dev->si_tty) { 961 struct tty *tp; 962 tp = dev->si_tty; 963 if (!tp->t_stop) { 964 devfs_debug(DEVFS_DEBUG_DEBUG, 965 "devfs: no t_stop\n"); 966 tp->t_stop = nottystop; 967 } 968 } 969 } 970 971 972 if (vn_isdisk(vp, NULL)) { 973 if (!dev->si_bsize_phys) 974 dev->si_bsize_phys = DEV_BSIZE; 975 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1); 976 } 977 978 vop_stdopen(ap); 979 #if 0 980 if (node) 981 nanotime(&node->atime); 982 #endif 983 984 /* 985 * If we replaced the vp the vop_stdopen() call will have loaded 986 * it into fp->f_data and vref()d the vp, giving us two refs. So 987 * instead of just unlocking it here we have to vput() it. 988 */ 989 if (orig_vp) 990 vput(vp); 991 992 /* Ugly pty magic, to make pty devices appear once they are opened */ 993 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) 994 node->flags &= ~DEVFS_INVISIBLE; 995 996 if (ap->a_fp) { 997 KKASSERT(ap->a_fp->f_type == DTYPE_VNODE); 998 KKASSERT((ap->a_fp->f_flag & FMASK) == (ap->a_mode & FMASK)); 999 ap->a_fp->f_ops = &devfs_dev_fileops; 1000 KKASSERT(ap->a_fp->f_data == (void *)vp); 1001 } 1002 1003 return 0; 1004 } 1005 1006 1007 static int 1008 devfs_spec_close(struct vop_close_args *ap) 1009 { 1010 struct devfs_node *node; 1011 struct proc *p = curproc; 1012 struct vnode *vp = ap->a_vp; 1013 cdev_t dev = vp->v_rdev; 1014 int error = 0; 1015 int needrelock; 1016 1017 if (dev) 1018 devfs_debug(DEVFS_DEBUG_DEBUG, 1019 "devfs_spec_close() called on %s! \n", 1020 dev->si_name); 1021 else 1022 devfs_debug(DEVFS_DEBUG_DEBUG, 1023 "devfs_spec_close() called, null vode!\n"); 1024 1025 /* 1026 * A couple of hacks for devices and tty devices. The 1027 * vnode ref count cannot be used to figure out the 1028 * last close, but we can use v_opencount now that 1029 * revoke works properly. 1030 * 1031 * Detect the last close on a controlling terminal and clear 1032 * the session (half-close). 1033 */ 1034 if (dev) 1035 reference_dev(dev); 1036 1037 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) { 1038 p->p_session->s_ttyvp = NULL; 1039 vrele(vp); 1040 } 1041 1042 /* 1043 * Vnodes can be opened and closed multiple times. Do not really 1044 * close the device unless (1) it is being closed forcibly, 1045 * (2) the device wants to track closes, or (3) this is the last 1046 * vnode doing its last close on the device. 1047 * 1048 * XXX the VXLOCK (force close) case can leave vnodes referencing 1049 * a closed device. This might not occur now that our revoke is 1050 * fixed. 1051 */ 1052 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n"); 1053 if (dev && ((vp->v_flag & VRECLAIMED) || 1054 (dev_dflags(dev) & D_TRACKCLOSE) || 1055 (vp->v_opencount == 1))) { 1056 /* 1057 * Ugly pty magic, to make pty devices disappear again once 1058 * they are closed. 1059 */ 1060 node = DEVFS_NODE(ap->a_vp); 1061 if (node && (node->flags & DEVFS_PTY)) 1062 node->flags |= DEVFS_INVISIBLE; 1063 1064 /* 1065 * Unlock around dev_dclose(), unless the vnode is 1066 * undergoing a vgone/reclaim (during umount). 1067 */ 1068 needrelock = 0; 1069 if ((vp->v_flag & VRECLAIMED) == 0 && vn_islocked(vp)) { 1070 needrelock = 1; 1071 vn_unlock(vp); 1072 } 1073 1074 /* 1075 * WARNING! If the device destroys itself the devfs node 1076 * can disappear here. 1077 * 1078 * WARNING! vn_lock() will fail if the vp is in a VRECLAIM, 1079 * which can occur during umount. 1080 */ 1081 error = dev_dclose(dev, ap->a_fflag, S_IFCHR); 1082 /* node is now stale */ 1083 1084 if (needrelock) { 1085 if (vn_lock(vp, LK_EXCLUSIVE | LK_RETRY) != 0) { 1086 panic("devfs_spec_close: vnode %p " 1087 "unexpectedly could not be relocked", 1088 vp); 1089 } 1090 } 1091 } else { 1092 error = 0; 1093 } 1094 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n"); 1095 1096 /* 1097 * Track the actual opens and closes on the vnode. The last close 1098 * disassociates the rdev. If the rdev is already disassociated or 1099 * the opencount is already 0, the vnode might have been revoked 1100 * and no further opencount tracking occurs. 1101 */ 1102 if (dev) 1103 release_dev(dev); 1104 if (vp->v_opencount > 0) 1105 vop_stdclose(ap); 1106 return(error); 1107 1108 } 1109 1110 1111 static int 1112 devfs_fo_close(struct file *fp) 1113 { 1114 struct vnode *vp = (struct vnode *)fp->f_data; 1115 int error; 1116 1117 fp->f_ops = &badfileops; 1118 error = vn_close(vp, fp->f_flag); 1119 1120 return (error); 1121 } 1122 1123 1124 /* 1125 * Device-optimized file table vnode read routine. 1126 * 1127 * This bypasses the VOP table and talks directly to the device. Most 1128 * filesystems just route to specfs and can make this optimization. 1129 * 1130 * MPALMOSTSAFE - acquires mplock 1131 */ 1132 static int 1133 devfs_fo_read(struct file *fp, struct uio *uio, 1134 struct ucred *cred, int flags) 1135 { 1136 struct devfs_node *node; 1137 struct vnode *vp; 1138 int ioflag; 1139 int error; 1140 cdev_t dev; 1141 1142 KASSERT(uio->uio_td == curthread, 1143 ("uio_td %p is not td %p", uio->uio_td, curthread)); 1144 1145 if (uio->uio_resid == 0) 1146 return 0; 1147 1148 vp = (struct vnode *)fp->f_data; 1149 if (vp == NULL || vp->v_type == VBAD) 1150 return EBADF; 1151 1152 node = DEVFS_NODE(vp); 1153 1154 if ((dev = vp->v_rdev) == NULL) 1155 return EBADF; 1156 1157 reference_dev(dev); 1158 1159 if ((flags & O_FOFFSET) == 0) 1160 uio->uio_offset = fp->f_offset; 1161 1162 ioflag = 0; 1163 if (flags & O_FBLOCKING) { 1164 /* ioflag &= ~IO_NDELAY; */ 1165 } else if (flags & O_FNONBLOCKING) { 1166 ioflag |= IO_NDELAY; 1167 } else if (fp->f_flag & FNONBLOCK) { 1168 ioflag |= IO_NDELAY; 1169 } 1170 if (flags & O_FBUFFERED) { 1171 /* ioflag &= ~IO_DIRECT; */ 1172 } else if (flags & O_FUNBUFFERED) { 1173 ioflag |= IO_DIRECT; 1174 } else if (fp->f_flag & O_DIRECT) { 1175 ioflag |= IO_DIRECT; 1176 } 1177 ioflag |= sequential_heuristic(uio, fp); 1178 1179 error = dev_dread(dev, uio, ioflag); 1180 1181 release_dev(dev); 1182 if (node) 1183 nanotime(&node->atime); 1184 if ((flags & O_FOFFSET) == 0) 1185 fp->f_offset = uio->uio_offset; 1186 fp->f_nextoff = uio->uio_offset; 1187 1188 return (error); 1189 } 1190 1191 1192 static int 1193 devfs_fo_write(struct file *fp, struct uio *uio, 1194 struct ucred *cred, int flags) 1195 { 1196 struct devfs_node *node; 1197 struct vnode *vp; 1198 int ioflag; 1199 int error; 1200 cdev_t dev; 1201 1202 KASSERT(uio->uio_td == curthread, 1203 ("uio_td %p is not p %p", uio->uio_td, curthread)); 1204 1205 vp = (struct vnode *)fp->f_data; 1206 if (vp == NULL || vp->v_type == VBAD) 1207 return EBADF; 1208 1209 node = DEVFS_NODE(vp); 1210 1211 if (vp->v_type == VREG) 1212 bwillwrite(uio->uio_resid); 1213 1214 vp = (struct vnode *)fp->f_data; 1215 1216 if ((dev = vp->v_rdev) == NULL) 1217 return EBADF; 1218 1219 reference_dev(dev); 1220 1221 if ((flags & O_FOFFSET) == 0) 1222 uio->uio_offset = fp->f_offset; 1223 1224 ioflag = IO_UNIT; 1225 if (vp->v_type == VREG && 1226 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { 1227 ioflag |= IO_APPEND; 1228 } 1229 1230 if (flags & O_FBLOCKING) { 1231 /* ioflag &= ~IO_NDELAY; */ 1232 } else if (flags & O_FNONBLOCKING) { 1233 ioflag |= IO_NDELAY; 1234 } else if (fp->f_flag & FNONBLOCK) { 1235 ioflag |= IO_NDELAY; 1236 } 1237 if (flags & O_FBUFFERED) { 1238 /* ioflag &= ~IO_DIRECT; */ 1239 } else if (flags & O_FUNBUFFERED) { 1240 ioflag |= IO_DIRECT; 1241 } else if (fp->f_flag & O_DIRECT) { 1242 ioflag |= IO_DIRECT; 1243 } 1244 if (flags & O_FASYNCWRITE) { 1245 /* ioflag &= ~IO_SYNC; */ 1246 } else if (flags & O_FSYNCWRITE) { 1247 ioflag |= IO_SYNC; 1248 } else if (fp->f_flag & O_FSYNC) { 1249 ioflag |= IO_SYNC; 1250 } 1251 1252 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) 1253 ioflag |= IO_SYNC; 1254 ioflag |= sequential_heuristic(uio, fp); 1255 1256 error = dev_dwrite(dev, uio, ioflag); 1257 1258 release_dev(dev); 1259 if (node) { 1260 nanotime(&node->atime); 1261 nanotime(&node->mtime); 1262 } 1263 1264 if ((flags & O_FOFFSET) == 0) 1265 fp->f_offset = uio->uio_offset; 1266 fp->f_nextoff = uio->uio_offset; 1267 1268 return (error); 1269 } 1270 1271 1272 static int 1273 devfs_fo_stat(struct file *fp, struct stat *sb, struct ucred *cred) 1274 { 1275 struct vnode *vp; 1276 struct vattr vattr; 1277 struct vattr *vap; 1278 u_short mode; 1279 cdev_t dev; 1280 int error; 1281 1282 vp = (struct vnode *)fp->f_data; 1283 if (vp == NULL || vp->v_type == VBAD) 1284 return EBADF; 1285 1286 error = vn_stat(vp, sb, cred); 1287 if (error) 1288 return (error); 1289 1290 vap = &vattr; 1291 error = VOP_GETATTR(vp, vap); 1292 if (error) 1293 return (error); 1294 1295 /* 1296 * Zero the spare stat fields 1297 */ 1298 sb->st_lspare = 0; 1299 sb->st_qspare1 = 0; 1300 sb->st_qspare2 = 0; 1301 1302 /* 1303 * Copy from vattr table ... or not in case it's a cloned device 1304 */ 1305 if (vap->va_fsid != VNOVAL) 1306 sb->st_dev = vap->va_fsid; 1307 else 1308 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1309 1310 sb->st_ino = vap->va_fileid; 1311 1312 mode = vap->va_mode; 1313 mode |= S_IFCHR; 1314 sb->st_mode = mode; 1315 1316 if (vap->va_nlink > (nlink_t)-1) 1317 sb->st_nlink = (nlink_t)-1; 1318 else 1319 sb->st_nlink = vap->va_nlink; 1320 1321 sb->st_uid = vap->va_uid; 1322 sb->st_gid = vap->va_gid; 1323 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev); 1324 sb->st_size = vap->va_bytes; 1325 sb->st_atimespec = vap->va_atime; 1326 sb->st_mtimespec = vap->va_mtime; 1327 sb->st_ctimespec = vap->va_ctime; 1328 1329 /* 1330 * A VCHR and VBLK device may track the last access and last modified 1331 * time independantly of the filesystem. This is particularly true 1332 * because device read and write calls may bypass the filesystem. 1333 */ 1334 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1335 dev = vp->v_rdev; 1336 if (dev != NULL) { 1337 if (dev->si_lastread) { 1338 sb->st_atimespec.tv_sec = dev->si_lastread; 1339 sb->st_atimespec.tv_nsec = 0; 1340 } 1341 if (dev->si_lastwrite) { 1342 sb->st_atimespec.tv_sec = dev->si_lastwrite; 1343 sb->st_atimespec.tv_nsec = 0; 1344 } 1345 } 1346 } 1347 1348 /* 1349 * According to www.opengroup.org, the meaning of st_blksize is 1350 * "a filesystem-specific preferred I/O block size for this 1351 * object. In some filesystem types, this may vary from file 1352 * to file" 1353 * Default to PAGE_SIZE after much discussion. 1354 */ 1355 1356 sb->st_blksize = PAGE_SIZE; 1357 1358 sb->st_flags = vap->va_flags; 1359 1360 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0); 1361 if (error) 1362 sb->st_gen = 0; 1363 else 1364 sb->st_gen = (u_int32_t)vap->va_gen; 1365 1366 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1367 1368 return (0); 1369 } 1370 1371 1372 static int 1373 devfs_fo_kqfilter(struct file *fp, struct knote *kn) 1374 { 1375 struct vnode *vp; 1376 int error; 1377 cdev_t dev; 1378 1379 vp = (struct vnode *)fp->f_data; 1380 if (vp == NULL || vp->v_type == VBAD) { 1381 error = EBADF; 1382 goto done; 1383 } 1384 if ((dev = vp->v_rdev) == NULL) { 1385 error = EBADF; 1386 goto done; 1387 } 1388 reference_dev(dev); 1389 1390 error = dev_dkqfilter(dev, kn); 1391 1392 release_dev(dev); 1393 1394 done: 1395 return (error); 1396 } 1397 1398 /* 1399 * MPALMOSTSAFE - acquires mplock 1400 */ 1401 static int 1402 devfs_fo_ioctl(struct file *fp, u_long com, caddr_t data, 1403 struct ucred *ucred, struct sysmsg *msg) 1404 { 1405 struct devfs_node *node; 1406 struct vnode *vp; 1407 struct vnode *ovp; 1408 cdev_t dev; 1409 int error; 1410 struct fiodname_args *name_args; 1411 size_t namlen; 1412 const char *name; 1413 1414 vp = ((struct vnode *)fp->f_data); 1415 1416 if ((dev = vp->v_rdev) == NULL) 1417 return EBADF; /* device was revoked */ 1418 1419 reference_dev(dev); 1420 1421 node = DEVFS_NODE(vp); 1422 1423 devfs_debug(DEVFS_DEBUG_DEBUG, 1424 "devfs_fo_ioctl() called! for dev %s\n", 1425 dev->si_name); 1426 1427 if (com == FIODTYPE) { 1428 *(int *)data = dev_dflags(dev) & D_TYPEMASK; 1429 error = 0; 1430 goto out; 1431 } else if (com == FIODNAME) { 1432 name_args = (struct fiodname_args *)data; 1433 name = dev->si_name; 1434 namlen = strlen(name) + 1; 1435 1436 devfs_debug(DEVFS_DEBUG_DEBUG, 1437 "ioctl, got: FIODNAME for %s\n", name); 1438 1439 if (namlen <= name_args->len) 1440 error = copyout(dev->si_name, name_args->name, namlen); 1441 else 1442 error = EINVAL; 1443 1444 devfs_debug(DEVFS_DEBUG_DEBUG, 1445 "ioctl stuff: error: %d\n", error); 1446 goto out; 1447 } 1448 1449 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg); 1450 1451 #if 0 1452 if (node) { 1453 nanotime(&node->atime); 1454 nanotime(&node->mtime); 1455 } 1456 #endif 1457 if (com == TIOCSCTTY) { 1458 devfs_debug(DEVFS_DEBUG_DEBUG, 1459 "devfs_fo_ioctl: got TIOCSCTTY on %s\n", 1460 dev->si_name); 1461 } 1462 if (error == 0 && com == TIOCSCTTY) { 1463 struct proc *p = curthread->td_proc; 1464 struct session *sess; 1465 1466 devfs_debug(DEVFS_DEBUG_DEBUG, 1467 "devfs_fo_ioctl: dealing with TIOCSCTTY on %s\n", 1468 dev->si_name); 1469 if (p == NULL) { 1470 error = ENOTTY; 1471 goto out; 1472 } 1473 sess = p->p_session; 1474 1475 /* 1476 * Do nothing if reassigning same control tty 1477 */ 1478 if (sess->s_ttyvp == vp) { 1479 error = 0; 1480 goto out; 1481 } 1482 1483 /* 1484 * Get rid of reference to old control tty 1485 */ 1486 ovp = sess->s_ttyvp; 1487 vref(vp); 1488 sess->s_ttyvp = vp; 1489 if (ovp) 1490 vrele(ovp); 1491 } 1492 1493 out: 1494 release_dev(dev); 1495 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_fo_ioctl() finished! \n"); 1496 return (error); 1497 } 1498 1499 1500 static int 1501 devfs_spec_fsync(struct vop_fsync_args *ap) 1502 { 1503 struct vnode *vp = ap->a_vp; 1504 int error; 1505 1506 if (!vn_isdisk(vp, NULL)) 1507 return (0); 1508 1509 /* 1510 * Flush all dirty buffers associated with a block device. 1511 */ 1512 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL); 1513 return (error); 1514 } 1515 1516 static int 1517 devfs_spec_read(struct vop_read_args *ap) 1518 { 1519 struct devfs_node *node; 1520 struct vnode *vp; 1521 struct uio *uio; 1522 cdev_t dev; 1523 int error; 1524 1525 vp = ap->a_vp; 1526 dev = vp->v_rdev; 1527 uio = ap->a_uio; 1528 node = DEVFS_NODE(vp); 1529 1530 if (dev == NULL) /* device was revoked */ 1531 return (EBADF); 1532 if (uio->uio_resid == 0) 1533 return (0); 1534 1535 vn_unlock(vp); 1536 error = dev_dread(dev, uio, ap->a_ioflag); 1537 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1538 1539 if (node) 1540 nanotime(&node->atime); 1541 1542 return (error); 1543 } 1544 1545 /* 1546 * Vnode op for write 1547 * 1548 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1549 * struct ucred *a_cred) 1550 */ 1551 static int 1552 devfs_spec_write(struct vop_write_args *ap) 1553 { 1554 struct devfs_node *node; 1555 struct vnode *vp; 1556 struct uio *uio; 1557 cdev_t dev; 1558 int error; 1559 1560 vp = ap->a_vp; 1561 dev = vp->v_rdev; 1562 uio = ap->a_uio; 1563 node = DEVFS_NODE(vp); 1564 1565 KKASSERT(uio->uio_segflg != UIO_NOCOPY); 1566 1567 if (dev == NULL) /* device was revoked */ 1568 return (EBADF); 1569 1570 vn_unlock(vp); 1571 error = dev_dwrite(dev, uio, ap->a_ioflag); 1572 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1573 1574 if (node) { 1575 nanotime(&node->atime); 1576 nanotime(&node->mtime); 1577 } 1578 1579 return (error); 1580 } 1581 1582 /* 1583 * Device ioctl operation. 1584 * 1585 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, 1586 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg) 1587 */ 1588 static int 1589 devfs_spec_ioctl(struct vop_ioctl_args *ap) 1590 { 1591 struct vnode *vp = ap->a_vp; 1592 struct devfs_node *node; 1593 cdev_t dev; 1594 1595 if ((dev = vp->v_rdev) == NULL) 1596 return (EBADF); /* device was revoked */ 1597 node = DEVFS_NODE(vp); 1598 1599 #if 0 1600 if (node) { 1601 nanotime(&node->atime); 1602 nanotime(&node->mtime); 1603 } 1604 #endif 1605 1606 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag, 1607 ap->a_cred, ap->a_sysmsg)); 1608 } 1609 1610 /* 1611 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn) 1612 */ 1613 /* ARGSUSED */ 1614 static int 1615 devfs_spec_kqfilter(struct vop_kqfilter_args *ap) 1616 { 1617 struct vnode *vp = ap->a_vp; 1618 struct devfs_node *node; 1619 cdev_t dev; 1620 1621 if ((dev = vp->v_rdev) == NULL) 1622 return (EBADF); /* device was revoked (EBADF) */ 1623 node = DEVFS_NODE(vp); 1624 1625 #if 0 1626 if (node) 1627 nanotime(&node->atime); 1628 #endif 1629 1630 return (dev_dkqfilter(dev, ap->a_kn)); 1631 } 1632 1633 /* 1634 * Convert a vnode strategy call into a device strategy call. Vnode strategy 1635 * calls are not limited to device DMA limits so we have to deal with the 1636 * case. 1637 * 1638 * spec_strategy(struct vnode *a_vp, struct bio *a_bio) 1639 */ 1640 static int 1641 devfs_spec_strategy(struct vop_strategy_args *ap) 1642 { 1643 struct bio *bio = ap->a_bio; 1644 struct buf *bp = bio->bio_buf; 1645 struct buf *nbp; 1646 struct vnode *vp; 1647 struct mount *mp; 1648 int chunksize; 1649 int maxiosize; 1650 1651 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL) 1652 buf_start(bp); 1653 1654 /* 1655 * Collect statistics on synchronous and asynchronous read 1656 * and write counts for disks that have associated filesystems. 1657 */ 1658 vp = ap->a_vp; 1659 KKASSERT(vp->v_rdev != NULL); /* XXX */ 1660 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) { 1661 if (bp->b_cmd == BUF_CMD_READ) { 1662 if (bp->b_flags & BIO_SYNC) 1663 mp->mnt_stat.f_syncreads++; 1664 else 1665 mp->mnt_stat.f_asyncreads++; 1666 } else { 1667 if (bp->b_flags & BIO_SYNC) 1668 mp->mnt_stat.f_syncwrites++; 1669 else 1670 mp->mnt_stat.f_asyncwrites++; 1671 } 1672 } 1673 1674 /* 1675 * Device iosize limitations only apply to read and write. Shortcut 1676 * the I/O if it fits. 1677 */ 1678 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) { 1679 devfs_debug(DEVFS_DEBUG_DEBUG, 1680 "%s: si_iosize_max not set!\n", 1681 dev_dname(vp->v_rdev)); 1682 maxiosize = MAXPHYS; 1683 } 1684 #if SPEC_CHAIN_DEBUG & 2 1685 maxiosize = 4096; 1686 #endif 1687 if (bp->b_bcount <= maxiosize || 1688 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) { 1689 dev_dstrategy_chain(vp->v_rdev, bio); 1690 return (0); 1691 } 1692 1693 /* 1694 * Clone the buffer and set up an I/O chain to chunk up the I/O. 1695 */ 1696 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO); 1697 initbufbio(nbp); 1698 buf_dep_init(nbp); 1699 BUF_LOCK(nbp, LK_EXCLUSIVE); 1700 BUF_KERNPROC(nbp); 1701 nbp->b_vp = vp; 1702 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP); 1703 nbp->b_data = bp->b_data; 1704 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1705 nbp->b_bio1.bio_offset = bio->bio_offset; 1706 nbp->b_bio1.bio_caller_info1.ptr = bio; 1707 1708 /* 1709 * Start the first transfer 1710 */ 1711 if (vn_isdisk(vp, NULL)) 1712 chunksize = vp->v_rdev->si_bsize_phys; 1713 else 1714 chunksize = DEV_BSIZE; 1715 chunksize = maxiosize / chunksize * chunksize; 1716 #if SPEC_CHAIN_DEBUG & 1 1717 devfs_debug(DEVFS_DEBUG_DEBUG, 1718 "spec_strategy chained I/O chunksize=%d\n", 1719 chunksize); 1720 #endif 1721 nbp->b_cmd = bp->b_cmd; 1722 nbp->b_bcount = chunksize; 1723 nbp->b_bufsize = chunksize; /* used to detect a short I/O */ 1724 nbp->b_bio1.bio_caller_info2.index = chunksize; 1725 1726 #if SPEC_CHAIN_DEBUG & 1 1727 devfs_debug(DEVFS_DEBUG_DEBUG, 1728 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1729 bp, 0, bp->b_bcount, nbp->b_bcount); 1730 #endif 1731 1732 dev_dstrategy(vp->v_rdev, &nbp->b_bio1); 1733 1734 if (DEVFS_NODE(vp)) { 1735 nanotime(&DEVFS_NODE(vp)->atime); 1736 nanotime(&DEVFS_NODE(vp)->mtime); 1737 } 1738 1739 return (0); 1740 } 1741 1742 /* 1743 * Chunked up transfer completion routine - chain transfers until done 1744 * 1745 * NOTE: MPSAFE callback. 1746 */ 1747 static 1748 void 1749 devfs_spec_strategy_done(struct bio *nbio) 1750 { 1751 struct buf *nbp = nbio->bio_buf; 1752 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */ 1753 struct buf *bp = bio->bio_buf; /* original bp */ 1754 int chunksize = nbio->bio_caller_info2.index; /* chunking */ 1755 int boffset = nbp->b_data - bp->b_data; 1756 1757 if (nbp->b_flags & B_ERROR) { 1758 /* 1759 * An error terminates the chain, propogate the error back 1760 * to the original bp 1761 */ 1762 bp->b_flags |= B_ERROR; 1763 bp->b_error = nbp->b_error; 1764 bp->b_resid = bp->b_bcount - boffset + 1765 (nbp->b_bcount - nbp->b_resid); 1766 #if SPEC_CHAIN_DEBUG & 1 1767 devfs_debug(DEVFS_DEBUG_DEBUG, 1768 "spec_strategy: chain %p error %d bcount %d/%d\n", 1769 bp, bp->b_error, bp->b_bcount, 1770 bp->b_bcount - bp->b_resid); 1771 #endif 1772 } else if (nbp->b_resid) { 1773 /* 1774 * A short read or write terminates the chain 1775 */ 1776 bp->b_error = nbp->b_error; 1777 bp->b_resid = bp->b_bcount - boffset + 1778 (nbp->b_bcount - nbp->b_resid); 1779 #if SPEC_CHAIN_DEBUG & 1 1780 devfs_debug(DEVFS_DEBUG_DEBUG, 1781 "spec_strategy: chain %p short read(1) " 1782 "bcount %d/%d\n", 1783 bp, bp->b_bcount - bp->b_resid, bp->b_bcount); 1784 #endif 1785 } else if (nbp->b_bcount != nbp->b_bufsize) { 1786 /* 1787 * A short read or write can also occur by truncating b_bcount 1788 */ 1789 #if SPEC_CHAIN_DEBUG & 1 1790 devfs_debug(DEVFS_DEBUG_DEBUG, 1791 "spec_strategy: chain %p short read(2) " 1792 "bcount %d/%d\n", 1793 bp, nbp->b_bcount + boffset, bp->b_bcount); 1794 #endif 1795 bp->b_error = 0; 1796 bp->b_bcount = nbp->b_bcount + boffset; 1797 bp->b_resid = nbp->b_resid; 1798 } else if (nbp->b_bcount + boffset == bp->b_bcount) { 1799 /* 1800 * No more data terminates the chain 1801 */ 1802 #if SPEC_CHAIN_DEBUG & 1 1803 devfs_debug(DEVFS_DEBUG_DEBUG, 1804 "spec_strategy: chain %p finished bcount %d\n", 1805 bp, bp->b_bcount); 1806 #endif 1807 bp->b_error = 0; 1808 bp->b_resid = 0; 1809 } else { 1810 /* 1811 * Continue the chain 1812 */ 1813 boffset += nbp->b_bcount; 1814 nbp->b_data = bp->b_data + boffset; 1815 nbp->b_bcount = bp->b_bcount - boffset; 1816 if (nbp->b_bcount > chunksize) 1817 nbp->b_bcount = chunksize; 1818 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1819 nbp->b_bio1.bio_offset = bio->bio_offset + boffset; 1820 1821 #if SPEC_CHAIN_DEBUG & 1 1822 devfs_debug(DEVFS_DEBUG_DEBUG, 1823 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1824 bp, boffset, bp->b_bcount, nbp->b_bcount); 1825 #endif 1826 1827 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1); 1828 return; 1829 } 1830 1831 /* 1832 * Fall through to here on termination. biodone(bp) and 1833 * clean up and free nbp. 1834 */ 1835 biodone(bio); 1836 BUF_UNLOCK(nbp); 1837 uninitbufbio(nbp); 1838 kfree(nbp, M_DEVBUF); 1839 } 1840 1841 /* 1842 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length) 1843 */ 1844 static int 1845 devfs_spec_freeblks(struct vop_freeblks_args *ap) 1846 { 1847 struct buf *bp; 1848 1849 /* 1850 * XXX: This assumes that strategy does the deed right away. 1851 * XXX: this may not be TRTTD. 1852 */ 1853 KKASSERT(ap->a_vp->v_rdev != NULL); 1854 if ((ap->a_vp->v_rdev->si_flags & SI_CANFREE) == 0) 1855 return (0); 1856 bp = geteblk(ap->a_length); 1857 bp->b_cmd = BUF_CMD_FREEBLKS; 1858 bp->b_bio1.bio_offset = ap->a_offset; 1859 bp->b_bcount = ap->a_length; 1860 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1); 1861 return (0); 1862 } 1863 1864 /* 1865 * Implement degenerate case where the block requested is the block 1866 * returned, and assume that the entire device is contiguous in regards 1867 * to the contiguous block range (runp and runb). 1868 * 1869 * spec_bmap(struct vnode *a_vp, off_t a_loffset, 1870 * off_t *a_doffsetp, int *a_runp, int *a_runb) 1871 */ 1872 static int 1873 devfs_spec_bmap(struct vop_bmap_args *ap) 1874 { 1875 if (ap->a_doffsetp != NULL) 1876 *ap->a_doffsetp = ap->a_loffset; 1877 if (ap->a_runp != NULL) 1878 *ap->a_runp = MAXBSIZE; 1879 if (ap->a_runb != NULL) { 1880 if (ap->a_loffset < MAXBSIZE) 1881 *ap->a_runb = (int)ap->a_loffset; 1882 else 1883 *ap->a_runb = MAXBSIZE; 1884 } 1885 return (0); 1886 } 1887 1888 1889 /* 1890 * Special device advisory byte-level locks. 1891 * 1892 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, 1893 * struct flock *a_fl, int a_flags) 1894 */ 1895 /* ARGSUSED */ 1896 static int 1897 devfs_spec_advlock(struct vop_advlock_args *ap) 1898 { 1899 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP); 1900 } 1901 1902 /* 1903 * NOTE: MPSAFE callback. 1904 */ 1905 static void 1906 devfs_spec_getpages_iodone(struct bio *bio) 1907 { 1908 bio->bio_buf->b_cmd = BUF_CMD_DONE; 1909 wakeup(bio->bio_buf); 1910 } 1911 1912 /* 1913 * spec_getpages() - get pages associated with device vnode. 1914 * 1915 * Note that spec_read and spec_write do not use the buffer cache, so we 1916 * must fully implement getpages here. 1917 */ 1918 static int 1919 devfs_spec_getpages(struct vop_getpages_args *ap) 1920 { 1921 vm_offset_t kva; 1922 int error; 1923 int i, pcount, size; 1924 struct buf *bp; 1925 vm_page_t m; 1926 vm_ooffset_t offset; 1927 int toff, nextoff, nread; 1928 struct vnode *vp = ap->a_vp; 1929 int blksiz; 1930 int gotreqpage; 1931 1932 error = 0; 1933 pcount = round_page(ap->a_count) / PAGE_SIZE; 1934 1935 /* 1936 * Calculate the offset of the transfer and do sanity check. 1937 */ 1938 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset; 1939 1940 /* 1941 * Round up physical size for real devices. We cannot round using 1942 * v_mount's block size data because v_mount has nothing to do with 1943 * the device. i.e. it's usually '/dev'. We need the physical block 1944 * size for the device itself. 1945 * 1946 * We can't use v_rdev->si_mountpoint because it only exists when the 1947 * block device is mounted. However, we can use v_rdev. 1948 */ 1949 if (vn_isdisk(vp, NULL)) 1950 blksiz = vp->v_rdev->si_bsize_phys; 1951 else 1952 blksiz = DEV_BSIZE; 1953 1954 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1); 1955 1956 bp = getpbuf_kva(NULL); 1957 kva = (vm_offset_t)bp->b_data; 1958 1959 /* 1960 * Map the pages to be read into the kva. 1961 */ 1962 pmap_qenter(kva, ap->a_m, pcount); 1963 1964 /* Build a minimal buffer header. */ 1965 bp->b_cmd = BUF_CMD_READ; 1966 bp->b_bcount = size; 1967 bp->b_resid = 0; 1968 bsetrunningbufspace(bp, size); 1969 1970 bp->b_bio1.bio_offset = offset; 1971 bp->b_bio1.bio_done = devfs_spec_getpages_iodone; 1972 1973 mycpu->gd_cnt.v_vnodein++; 1974 mycpu->gd_cnt.v_vnodepgsin += pcount; 1975 1976 /* Do the input. */ 1977 vn_strategy(ap->a_vp, &bp->b_bio1); 1978 1979 crit_enter(); 1980 1981 /* We definitely need to be at splbio here. */ 1982 while (bp->b_cmd != BUF_CMD_DONE) 1983 tsleep(bp, 0, "spread", 0); 1984 1985 crit_exit(); 1986 1987 if (bp->b_flags & B_ERROR) { 1988 if (bp->b_error) 1989 error = bp->b_error; 1990 else 1991 error = EIO; 1992 } 1993 1994 /* 1995 * If EOF is encountered we must zero-extend the result in order 1996 * to ensure that the page does not contain garabge. When no 1997 * error occurs, an early EOF is indicated if b_bcount got truncated. 1998 * b_resid is relative to b_bcount and should be 0, but some devices 1999 * might indicate an EOF with b_resid instead of truncating b_bcount. 2000 */ 2001 nread = bp->b_bcount - bp->b_resid; 2002 if (nread < ap->a_count) 2003 bzero((caddr_t)kva + nread, ap->a_count - nread); 2004 pmap_qremove(kva, pcount); 2005 2006 gotreqpage = 0; 2007 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) { 2008 nextoff = toff + PAGE_SIZE; 2009 m = ap->a_m[i]; 2010 2011 m->flags &= ~PG_ZERO; 2012 2013 /* 2014 * NOTE: vm_page_undirty/clear_dirty etc do not clear the 2015 * pmap modified bit. pmap modified bit should have 2016 * already been cleared. 2017 */ 2018 if (nextoff <= nread) { 2019 m->valid = VM_PAGE_BITS_ALL; 2020 vm_page_undirty(m); 2021 } else if (toff < nread) { 2022 /* 2023 * Since this is a VM request, we have to supply the 2024 * unaligned offset to allow vm_page_set_valid() 2025 * to zero sub-DEV_BSIZE'd portions of the page. 2026 */ 2027 vm_page_set_valid(m, 0, nread - toff); 2028 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff); 2029 } else { 2030 m->valid = 0; 2031 vm_page_undirty(m); 2032 } 2033 2034 if (i != ap->a_reqpage) { 2035 /* 2036 * Just in case someone was asking for this page we 2037 * now tell them that it is ok to use. 2038 */ 2039 if (!error || (m->valid == VM_PAGE_BITS_ALL)) { 2040 if (m->valid) { 2041 if (m->flags & PG_REFERENCED) { 2042 vm_page_activate(m); 2043 } else { 2044 vm_page_deactivate(m); 2045 } 2046 vm_page_wakeup(m); 2047 } else { 2048 vm_page_free(m); 2049 } 2050 } else { 2051 vm_page_free(m); 2052 } 2053 } else if (m->valid) { 2054 gotreqpage = 1; 2055 /* 2056 * Since this is a VM request, we need to make the 2057 * entire page presentable by zeroing invalid sections. 2058 */ 2059 if (m->valid != VM_PAGE_BITS_ALL) 2060 vm_page_zero_invalid(m, FALSE); 2061 } 2062 } 2063 if (!gotreqpage) { 2064 m = ap->a_m[ap->a_reqpage]; 2065 devfs_debug(DEVFS_DEBUG_WARNING, 2066 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n", 2067 devtoname(vp->v_rdev), error, bp, bp->b_vp); 2068 devfs_debug(DEVFS_DEBUG_WARNING, 2069 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n", 2070 size, bp->b_resid, ap->a_count, m->valid); 2071 devfs_debug(DEVFS_DEBUG_WARNING, 2072 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n", 2073 nread, ap->a_reqpage, (u_long)m->pindex, pcount); 2074 /* 2075 * Free the buffer header back to the swap buffer pool. 2076 */ 2077 relpbuf(bp, NULL); 2078 return VM_PAGER_ERROR; 2079 } 2080 /* 2081 * Free the buffer header back to the swap buffer pool. 2082 */ 2083 relpbuf(bp, NULL); 2084 if (DEVFS_NODE(ap->a_vp)) 2085 nanotime(&DEVFS_NODE(ap->a_vp)->mtime); 2086 return VM_PAGER_OK; 2087 } 2088 2089 static __inline 2090 int 2091 sequential_heuristic(struct uio *uio, struct file *fp) 2092 { 2093 /* 2094 * Sequential heuristic - detect sequential operation 2095 */ 2096 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || 2097 uio->uio_offset == fp->f_nextoff) { 2098 /* 2099 * XXX we assume that the filesystem block size is 2100 * the default. Not true, but still gives us a pretty 2101 * good indicator of how sequential the read operations 2102 * are. 2103 */ 2104 int tmpseq = fp->f_seqcount; 2105 2106 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE; 2107 if (tmpseq > IO_SEQMAX) 2108 tmpseq = IO_SEQMAX; 2109 fp->f_seqcount = tmpseq; 2110 return(fp->f_seqcount << IO_SEQSHIFT); 2111 } 2112 2113 /* 2114 * Not sequential, quick draw-down of seqcount 2115 */ 2116 if (fp->f_seqcount > 1) 2117 fp->f_seqcount = 1; 2118 else 2119 fp->f_seqcount = 0; 2120 return(0); 2121 } 2122