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 == Nlink) && (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 != Nroot) && (dnode->node_type != Ndir)) { 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 == Nlink) && (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 == Ndev) && 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 != Nroot) && (dnode->node_type != Ndir)) 689 goto out; 690 691 lockmgr(&devfs_lock, LK_EXCLUSIVE); 692 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Ndir, 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 != Nroot) && (dnode->node_type != Ndir)) 719 goto out; 720 721 lockmgr(&devfs_lock, LK_EXCLUSIVE); 722 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Nlink, 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 != Nroot) && (dnode->node_type != Ndir)) 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 != Ndir) { 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_unlink(ap->a_nch); 787 out: 788 lockmgr(&devfs_lock, LK_RELEASE); 789 return error; 790 } 791 792 static int 793 devfs_vop_nremove(struct vop_nremove_args *ap) 794 { 795 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 796 struct devfs_node *node; 797 struct namecache *ncp; 798 int error = ENOENT; 799 800 ncp = ap->a_nch->ncp; 801 802 if (!devfs_node_is_accessible(dnode)) 803 return ENOENT; 804 805 lockmgr(&devfs_lock, LK_EXCLUSIVE); 806 807 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 808 goto out; 809 810 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 811 if (ncp->nc_nlen != node->d_dir.d_namlen) 812 continue; 813 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 814 continue; 815 816 /* 817 * only allow removal of user created stuff (e.g. symlinks) 818 */ 819 if ((node->flags & DEVFS_USER_CREATED) == 0) { 820 error = EPERM; 821 goto out; 822 } else if (node->node_type == Ndir) { 823 error = EISDIR; 824 goto out; 825 } else { 826 if (node->v_node) 827 cache_inval_vp(node->v_node, CINV_DESTROY); 828 devfs_unlinkp(node); 829 error = 0; 830 break; 831 } 832 } 833 834 cache_unlink(ap->a_nch); 835 out: 836 lockmgr(&devfs_lock, LK_RELEASE); 837 return error; 838 } 839 840 841 static int 842 devfs_spec_open(struct vop_open_args *ap) 843 { 844 struct vnode *vp = ap->a_vp; 845 struct vnode *orig_vp = NULL; 846 struct devfs_node *node = DEVFS_NODE(vp); 847 struct devfs_node *newnode; 848 cdev_t dev, ndev = NULL; 849 int error = 0; 850 851 if (node) { 852 if (node->d_dev == NULL) 853 return ENXIO; 854 if (!devfs_node_is_accessible(node)) 855 return ENOENT; 856 } 857 858 if ((dev = vp->v_rdev) == NULL) 859 return ENXIO; 860 861 if (node && ap->a_fp) { 862 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n"); 863 lockmgr(&devfs_lock, LK_EXCLUSIVE); 864 865 ndev = devfs_clone(dev, node->d_dir.d_name, node->d_dir.d_namlen, 866 ap->a_mode, ap->a_cred); 867 if (ndev != NULL) { 868 newnode = devfs_create_device_node( 869 DEVFS_MNTDATA(vp->v_mount)->root_node, 870 ndev, NULL, NULL); 871 /* XXX: possibly destroy device if this happens */ 872 873 if (newnode != NULL) { 874 dev = ndev; 875 devfs_link_dev(dev); 876 877 devfs_debug(DEVFS_DEBUG_DEBUG, 878 "parent here is: %s, node is: |%s|\n", 879 ((node->parent->node_type == Nroot) ? 880 "ROOT!" : node->parent->d_dir.d_name), 881 newnode->d_dir.d_name); 882 devfs_debug(DEVFS_DEBUG_DEBUG, 883 "test: %s\n", 884 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name); 885 886 /* 887 * orig_vp is set to the original vp if we cloned. 888 */ 889 /* node->flags |= DEVFS_CLONED; */ 890 devfs_allocv(&vp, newnode); 891 orig_vp = ap->a_vp; 892 ap->a_vp = vp; 893 } 894 } 895 lockmgr(&devfs_lock, LK_RELEASE); 896 } 897 898 devfs_debug(DEVFS_DEBUG_DEBUG, 899 "devfs_spec_open() called on %s! \n", 900 dev->si_name); 901 902 /* 903 * Make this field valid before any I/O in ->d_open 904 */ 905 if (!dev->si_iosize_max) 906 /* XXX: old DFLTPHYS == 64KB dependency */ 907 dev->si_iosize_max = min(MAXPHYS,64*1024); 908 909 if (dev_dflags(dev) & D_TTY) 910 vsetflags(vp, VISTTY); 911 912 /* 913 * Open underlying device 914 */ 915 vn_unlock(vp); 916 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred); 917 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 918 919 /* 920 * Clean up any cloned vp if we error out. 921 */ 922 if (error) { 923 if (orig_vp) { 924 vput(vp); 925 ap->a_vp = orig_vp; 926 /* orig_vp = NULL; */ 927 } 928 return error; 929 } 930 931 /* 932 * This checks if the disk device is going to be opened for writing. 933 * It will be only allowed in the cases where securelevel permits it 934 * and it's not mounted R/W. 935 */ 936 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) && 937 (ap->a_cred != FSCRED)) { 938 939 /* Very secure mode. No open for writing allowed */ 940 if (securelevel >= 2) 941 return EPERM; 942 943 /* 944 * If it is mounted R/W, do not allow to open for writing. 945 * In the case it's mounted read-only but securelevel 946 * is >= 1, then do not allow opening for writing either. 947 */ 948 if (vfs_mountedon(vp)) { 949 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY)) 950 return EBUSY; 951 else if (securelevel >= 1) 952 return EPERM; 953 } 954 } 955 956 if (dev_dflags(dev) & D_TTY) { 957 if (dev->si_tty) { 958 struct tty *tp; 959 tp = dev->si_tty; 960 if (!tp->t_stop) { 961 devfs_debug(DEVFS_DEBUG_DEBUG, 962 "devfs: no t_stop\n"); 963 tp->t_stop = nottystop; 964 } 965 } 966 } 967 968 969 if (vn_isdisk(vp, NULL)) { 970 if (!dev->si_bsize_phys) 971 dev->si_bsize_phys = DEV_BSIZE; 972 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1); 973 } 974 975 vop_stdopen(ap); 976 #if 0 977 if (node) 978 nanotime(&node->atime); 979 #endif 980 981 /* 982 * If we replaced the vp the vop_stdopen() call will have loaded 983 * it into fp->f_data and vref()d the vp, giving us two refs. So 984 * instead of just unlocking it here we have to vput() it. 985 */ 986 if (orig_vp) 987 vput(vp); 988 989 /* Ugly pty magic, to make pty devices appear once they are opened */ 990 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) 991 node->flags &= ~DEVFS_INVISIBLE; 992 993 if (ap->a_fp) { 994 KKASSERT(ap->a_fp->f_type == DTYPE_VNODE); 995 KKASSERT((ap->a_fp->f_flag & FMASK) == (ap->a_mode & FMASK)); 996 ap->a_fp->f_ops = &devfs_dev_fileops; 997 KKASSERT(ap->a_fp->f_data == (void *)vp); 998 } 999 1000 return 0; 1001 } 1002 1003 1004 static int 1005 devfs_spec_close(struct vop_close_args *ap) 1006 { 1007 struct devfs_node *node; 1008 struct proc *p = curproc; 1009 struct vnode *vp = ap->a_vp; 1010 cdev_t dev = vp->v_rdev; 1011 int error = 0; 1012 int needrelock; 1013 1014 if (dev) 1015 devfs_debug(DEVFS_DEBUG_DEBUG, 1016 "devfs_spec_close() called on %s! \n", 1017 dev->si_name); 1018 else 1019 devfs_debug(DEVFS_DEBUG_DEBUG, 1020 "devfs_spec_close() called, null vode!\n"); 1021 1022 /* 1023 * A couple of hacks for devices and tty devices. The 1024 * vnode ref count cannot be used to figure out the 1025 * last close, but we can use v_opencount now that 1026 * revoke works properly. 1027 * 1028 * Detect the last close on a controlling terminal and clear 1029 * the session (half-close). 1030 */ 1031 if (dev) 1032 reference_dev(dev); 1033 1034 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) { 1035 p->p_session->s_ttyvp = NULL; 1036 vrele(vp); 1037 } 1038 1039 /* 1040 * Vnodes can be opened and closed multiple times. Do not really 1041 * close the device unless (1) it is being closed forcibly, 1042 * (2) the device wants to track closes, or (3) this is the last 1043 * vnode doing its last close on the device. 1044 * 1045 * XXX the VXLOCK (force close) case can leave vnodes referencing 1046 * a closed device. This might not occur now that our revoke is 1047 * fixed. 1048 */ 1049 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n"); 1050 if (dev && ((vp->v_flag & VRECLAIMED) || 1051 (dev_dflags(dev) & D_TRACKCLOSE) || 1052 (vp->v_opencount == 1))) { 1053 /* 1054 * Ugly pty magic, to make pty devices disappear again once 1055 * they are closed. 1056 */ 1057 node = DEVFS_NODE(ap->a_vp); 1058 if (node && (node->flags & DEVFS_PTY)) 1059 node->flags |= DEVFS_INVISIBLE; 1060 1061 /* 1062 * Unlock around dev_dclose(), unless the vnode is 1063 * undergoing a vgone/reclaim (during umount). 1064 */ 1065 needrelock = 0; 1066 if ((vp->v_flag & VRECLAIMED) == 0 && vn_islocked(vp)) { 1067 needrelock = 1; 1068 vn_unlock(vp); 1069 } 1070 1071 /* 1072 * WARNING! If the device destroys itself the devfs node 1073 * can disappear here. 1074 * 1075 * WARNING! vn_lock() will fail if the vp is in a VRECLAIM, 1076 * which can occur during umount. 1077 */ 1078 error = dev_dclose(dev, ap->a_fflag, S_IFCHR); 1079 /* node is now stale */ 1080 1081 if (needrelock) { 1082 if (vn_lock(vp, LK_EXCLUSIVE | LK_RETRY) != 0) { 1083 panic("devfs_spec_close: vnode %p " 1084 "unexpectedly could not be relocked", 1085 vp); 1086 } 1087 } 1088 } else { 1089 error = 0; 1090 } 1091 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n"); 1092 1093 /* 1094 * Track the actual opens and closes on the vnode. The last close 1095 * disassociates the rdev. If the rdev is already disassociated or 1096 * the opencount is already 0, the vnode might have been revoked 1097 * and no further opencount tracking occurs. 1098 */ 1099 if (dev) 1100 release_dev(dev); 1101 if (vp->v_opencount > 0) 1102 vop_stdclose(ap); 1103 return(error); 1104 1105 } 1106 1107 1108 static int 1109 devfs_fo_close(struct file *fp) 1110 { 1111 struct vnode *vp = (struct vnode *)fp->f_data; 1112 int error; 1113 1114 fp->f_ops = &badfileops; 1115 error = vn_close(vp, fp->f_flag); 1116 1117 return (error); 1118 } 1119 1120 1121 /* 1122 * Device-optimized file table vnode read routine. 1123 * 1124 * This bypasses the VOP table and talks directly to the device. Most 1125 * filesystems just route to specfs and can make this optimization. 1126 * 1127 * MPALMOSTSAFE - acquires mplock 1128 */ 1129 static int 1130 devfs_fo_read(struct file *fp, struct uio *uio, 1131 struct ucred *cred, int flags) 1132 { 1133 struct devfs_node *node; 1134 struct vnode *vp; 1135 int ioflag; 1136 int error; 1137 cdev_t dev; 1138 1139 KASSERT(uio->uio_td == curthread, 1140 ("uio_td %p is not td %p", uio->uio_td, curthread)); 1141 1142 if (uio->uio_resid == 0) 1143 return 0; 1144 1145 vp = (struct vnode *)fp->f_data; 1146 if (vp == NULL || vp->v_type == VBAD) 1147 return EBADF; 1148 1149 node = DEVFS_NODE(vp); 1150 1151 if ((dev = vp->v_rdev) == NULL) 1152 return EBADF; 1153 1154 reference_dev(dev); 1155 1156 if ((flags & O_FOFFSET) == 0) 1157 uio->uio_offset = fp->f_offset; 1158 1159 ioflag = 0; 1160 if (flags & O_FBLOCKING) { 1161 /* ioflag &= ~IO_NDELAY; */ 1162 } else if (flags & O_FNONBLOCKING) { 1163 ioflag |= IO_NDELAY; 1164 } else if (fp->f_flag & FNONBLOCK) { 1165 ioflag |= IO_NDELAY; 1166 } 1167 if (flags & O_FBUFFERED) { 1168 /* ioflag &= ~IO_DIRECT; */ 1169 } else if (flags & O_FUNBUFFERED) { 1170 ioflag |= IO_DIRECT; 1171 } else if (fp->f_flag & O_DIRECT) { 1172 ioflag |= IO_DIRECT; 1173 } 1174 ioflag |= sequential_heuristic(uio, fp); 1175 1176 error = dev_dread(dev, uio, ioflag); 1177 1178 release_dev(dev); 1179 if (node) 1180 nanotime(&node->atime); 1181 if ((flags & O_FOFFSET) == 0) 1182 fp->f_offset = uio->uio_offset; 1183 fp->f_nextoff = uio->uio_offset; 1184 1185 return (error); 1186 } 1187 1188 1189 static int 1190 devfs_fo_write(struct file *fp, struct uio *uio, 1191 struct ucred *cred, int flags) 1192 { 1193 struct devfs_node *node; 1194 struct vnode *vp; 1195 int ioflag; 1196 int error; 1197 cdev_t dev; 1198 1199 KASSERT(uio->uio_td == curthread, 1200 ("uio_td %p is not p %p", uio->uio_td, curthread)); 1201 1202 vp = (struct vnode *)fp->f_data; 1203 if (vp == NULL || vp->v_type == VBAD) 1204 return EBADF; 1205 1206 node = DEVFS_NODE(vp); 1207 1208 if (vp->v_type == VREG) 1209 bwillwrite(uio->uio_resid); 1210 1211 vp = (struct vnode *)fp->f_data; 1212 1213 if ((dev = vp->v_rdev) == NULL) 1214 return EBADF; 1215 1216 reference_dev(dev); 1217 1218 if ((flags & O_FOFFSET) == 0) 1219 uio->uio_offset = fp->f_offset; 1220 1221 ioflag = IO_UNIT; 1222 if (vp->v_type == VREG && 1223 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { 1224 ioflag |= IO_APPEND; 1225 } 1226 1227 if (flags & O_FBLOCKING) { 1228 /* ioflag &= ~IO_NDELAY; */ 1229 } else if (flags & O_FNONBLOCKING) { 1230 ioflag |= IO_NDELAY; 1231 } else if (fp->f_flag & FNONBLOCK) { 1232 ioflag |= IO_NDELAY; 1233 } 1234 if (flags & O_FBUFFERED) { 1235 /* ioflag &= ~IO_DIRECT; */ 1236 } else if (flags & O_FUNBUFFERED) { 1237 ioflag |= IO_DIRECT; 1238 } else if (fp->f_flag & O_DIRECT) { 1239 ioflag |= IO_DIRECT; 1240 } 1241 if (flags & O_FASYNCWRITE) { 1242 /* ioflag &= ~IO_SYNC; */ 1243 } else if (flags & O_FSYNCWRITE) { 1244 ioflag |= IO_SYNC; 1245 } else if (fp->f_flag & O_FSYNC) { 1246 ioflag |= IO_SYNC; 1247 } 1248 1249 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) 1250 ioflag |= IO_SYNC; 1251 ioflag |= sequential_heuristic(uio, fp); 1252 1253 error = dev_dwrite(dev, uio, ioflag); 1254 1255 release_dev(dev); 1256 if (node) { 1257 nanotime(&node->atime); 1258 nanotime(&node->mtime); 1259 } 1260 1261 if ((flags & O_FOFFSET) == 0) 1262 fp->f_offset = uio->uio_offset; 1263 fp->f_nextoff = uio->uio_offset; 1264 1265 return (error); 1266 } 1267 1268 1269 static int 1270 devfs_fo_stat(struct file *fp, struct stat *sb, struct ucred *cred) 1271 { 1272 struct vnode *vp; 1273 struct vattr vattr; 1274 struct vattr *vap; 1275 u_short mode; 1276 cdev_t dev; 1277 int error; 1278 1279 vp = (struct vnode *)fp->f_data; 1280 if (vp == NULL || vp->v_type == VBAD) 1281 return EBADF; 1282 1283 error = vn_stat(vp, sb, cred); 1284 if (error) 1285 return (error); 1286 1287 vap = &vattr; 1288 error = VOP_GETATTR(vp, vap); 1289 if (error) 1290 return (error); 1291 1292 /* 1293 * Zero the spare stat fields 1294 */ 1295 sb->st_lspare = 0; 1296 sb->st_qspare1 = 0; 1297 sb->st_qspare2 = 0; 1298 1299 /* 1300 * Copy from vattr table ... or not in case it's a cloned device 1301 */ 1302 if (vap->va_fsid != VNOVAL) 1303 sb->st_dev = vap->va_fsid; 1304 else 1305 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1306 1307 sb->st_ino = vap->va_fileid; 1308 1309 mode = vap->va_mode; 1310 mode |= S_IFCHR; 1311 sb->st_mode = mode; 1312 1313 if (vap->va_nlink > (nlink_t)-1) 1314 sb->st_nlink = (nlink_t)-1; 1315 else 1316 sb->st_nlink = vap->va_nlink; 1317 1318 sb->st_uid = vap->va_uid; 1319 sb->st_gid = vap->va_gid; 1320 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev); 1321 sb->st_size = vap->va_bytes; 1322 sb->st_atimespec = vap->va_atime; 1323 sb->st_mtimespec = vap->va_mtime; 1324 sb->st_ctimespec = vap->va_ctime; 1325 1326 /* 1327 * A VCHR and VBLK device may track the last access and last modified 1328 * time independantly of the filesystem. This is particularly true 1329 * because device read and write calls may bypass the filesystem. 1330 */ 1331 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1332 dev = vp->v_rdev; 1333 if (dev != NULL) { 1334 if (dev->si_lastread) { 1335 sb->st_atimespec.tv_sec = dev->si_lastread; 1336 sb->st_atimespec.tv_nsec = 0; 1337 } 1338 if (dev->si_lastwrite) { 1339 sb->st_atimespec.tv_sec = dev->si_lastwrite; 1340 sb->st_atimespec.tv_nsec = 0; 1341 } 1342 } 1343 } 1344 1345 /* 1346 * According to www.opengroup.org, the meaning of st_blksize is 1347 * "a filesystem-specific preferred I/O block size for this 1348 * object. In some filesystem types, this may vary from file 1349 * to file" 1350 * Default to PAGE_SIZE after much discussion. 1351 */ 1352 1353 sb->st_blksize = PAGE_SIZE; 1354 1355 sb->st_flags = vap->va_flags; 1356 1357 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0); 1358 if (error) 1359 sb->st_gen = 0; 1360 else 1361 sb->st_gen = (u_int32_t)vap->va_gen; 1362 1363 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1364 1365 return (0); 1366 } 1367 1368 1369 static int 1370 devfs_fo_kqfilter(struct file *fp, struct knote *kn) 1371 { 1372 struct vnode *vp; 1373 int error; 1374 cdev_t dev; 1375 1376 vp = (struct vnode *)fp->f_data; 1377 if (vp == NULL || vp->v_type == VBAD) { 1378 error = EBADF; 1379 goto done; 1380 } 1381 if ((dev = vp->v_rdev) == NULL) { 1382 error = EBADF; 1383 goto done; 1384 } 1385 reference_dev(dev); 1386 1387 error = dev_dkqfilter(dev, kn); 1388 1389 release_dev(dev); 1390 1391 done: 1392 return (error); 1393 } 1394 1395 /* 1396 * MPALMOSTSAFE - acquires mplock 1397 */ 1398 static int 1399 devfs_fo_ioctl(struct file *fp, u_long com, caddr_t data, 1400 struct ucred *ucred, struct sysmsg *msg) 1401 { 1402 struct devfs_node *node; 1403 struct vnode *vp; 1404 struct vnode *ovp; 1405 cdev_t dev; 1406 int error; 1407 struct fiodname_args *name_args; 1408 size_t namlen; 1409 const char *name; 1410 1411 vp = ((struct vnode *)fp->f_data); 1412 1413 if ((dev = vp->v_rdev) == NULL) 1414 return EBADF; /* device was revoked */ 1415 1416 reference_dev(dev); 1417 1418 node = DEVFS_NODE(vp); 1419 1420 devfs_debug(DEVFS_DEBUG_DEBUG, 1421 "devfs_fo_ioctl() called! for dev %s\n", 1422 dev->si_name); 1423 1424 if (com == FIODTYPE) { 1425 *(int *)data = dev_dflags(dev) & D_TYPEMASK; 1426 error = 0; 1427 goto out; 1428 } else if (com == FIODNAME) { 1429 name_args = (struct fiodname_args *)data; 1430 name = dev->si_name; 1431 namlen = strlen(name) + 1; 1432 1433 devfs_debug(DEVFS_DEBUG_DEBUG, 1434 "ioctl, got: FIODNAME for %s\n", name); 1435 1436 if (namlen <= name_args->len) 1437 error = copyout(dev->si_name, name_args->name, namlen); 1438 else 1439 error = EINVAL; 1440 1441 devfs_debug(DEVFS_DEBUG_DEBUG, 1442 "ioctl stuff: error: %d\n", error); 1443 goto out; 1444 } 1445 1446 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg); 1447 1448 #if 0 1449 if (node) { 1450 nanotime(&node->atime); 1451 nanotime(&node->mtime); 1452 } 1453 #endif 1454 if (com == TIOCSCTTY) { 1455 devfs_debug(DEVFS_DEBUG_DEBUG, 1456 "devfs_fo_ioctl: got TIOCSCTTY on %s\n", 1457 dev->si_name); 1458 } 1459 if (error == 0 && com == TIOCSCTTY) { 1460 struct proc *p = curthread->td_proc; 1461 struct session *sess; 1462 1463 devfs_debug(DEVFS_DEBUG_DEBUG, 1464 "devfs_fo_ioctl: dealing with TIOCSCTTY on %s\n", 1465 dev->si_name); 1466 if (p == NULL) { 1467 error = ENOTTY; 1468 goto out; 1469 } 1470 sess = p->p_session; 1471 1472 /* 1473 * Do nothing if reassigning same control tty 1474 */ 1475 if (sess->s_ttyvp == vp) { 1476 error = 0; 1477 goto out; 1478 } 1479 1480 /* 1481 * Get rid of reference to old control tty 1482 */ 1483 ovp = sess->s_ttyvp; 1484 vref(vp); 1485 sess->s_ttyvp = vp; 1486 if (ovp) 1487 vrele(ovp); 1488 } 1489 1490 out: 1491 release_dev(dev); 1492 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_fo_ioctl() finished! \n"); 1493 return (error); 1494 } 1495 1496 1497 static int 1498 devfs_spec_fsync(struct vop_fsync_args *ap) 1499 { 1500 struct vnode *vp = ap->a_vp; 1501 int error; 1502 1503 if (!vn_isdisk(vp, NULL)) 1504 return (0); 1505 1506 /* 1507 * Flush all dirty buffers associated with a block device. 1508 */ 1509 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL); 1510 return (error); 1511 } 1512 1513 static int 1514 devfs_spec_read(struct vop_read_args *ap) 1515 { 1516 struct devfs_node *node; 1517 struct vnode *vp; 1518 struct uio *uio; 1519 cdev_t dev; 1520 int error; 1521 1522 vp = ap->a_vp; 1523 dev = vp->v_rdev; 1524 uio = ap->a_uio; 1525 node = DEVFS_NODE(vp); 1526 1527 if (dev == NULL) /* device was revoked */ 1528 return (EBADF); 1529 if (uio->uio_resid == 0) 1530 return (0); 1531 1532 vn_unlock(vp); 1533 error = dev_dread(dev, uio, ap->a_ioflag); 1534 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1535 1536 if (node) 1537 nanotime(&node->atime); 1538 1539 return (error); 1540 } 1541 1542 /* 1543 * Vnode op for write 1544 * 1545 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1546 * struct ucred *a_cred) 1547 */ 1548 static int 1549 devfs_spec_write(struct vop_write_args *ap) 1550 { 1551 struct devfs_node *node; 1552 struct vnode *vp; 1553 struct uio *uio; 1554 cdev_t dev; 1555 int error; 1556 1557 vp = ap->a_vp; 1558 dev = vp->v_rdev; 1559 uio = ap->a_uio; 1560 node = DEVFS_NODE(vp); 1561 1562 KKASSERT(uio->uio_segflg != UIO_NOCOPY); 1563 1564 if (dev == NULL) /* device was revoked */ 1565 return (EBADF); 1566 1567 vn_unlock(vp); 1568 error = dev_dwrite(dev, uio, ap->a_ioflag); 1569 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1570 1571 if (node) { 1572 nanotime(&node->atime); 1573 nanotime(&node->mtime); 1574 } 1575 1576 return (error); 1577 } 1578 1579 /* 1580 * Device ioctl operation. 1581 * 1582 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, 1583 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg) 1584 */ 1585 static int 1586 devfs_spec_ioctl(struct vop_ioctl_args *ap) 1587 { 1588 struct vnode *vp = ap->a_vp; 1589 struct devfs_node *node; 1590 cdev_t dev; 1591 1592 if ((dev = vp->v_rdev) == NULL) 1593 return (EBADF); /* device was revoked */ 1594 node = DEVFS_NODE(vp); 1595 1596 #if 0 1597 if (node) { 1598 nanotime(&node->atime); 1599 nanotime(&node->mtime); 1600 } 1601 #endif 1602 1603 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag, 1604 ap->a_cred, ap->a_sysmsg)); 1605 } 1606 1607 /* 1608 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn) 1609 */ 1610 /* ARGSUSED */ 1611 static int 1612 devfs_spec_kqfilter(struct vop_kqfilter_args *ap) 1613 { 1614 struct vnode *vp = ap->a_vp; 1615 struct devfs_node *node; 1616 cdev_t dev; 1617 1618 if ((dev = vp->v_rdev) == NULL) 1619 return (EBADF); /* device was revoked (EBADF) */ 1620 node = DEVFS_NODE(vp); 1621 1622 #if 0 1623 if (node) 1624 nanotime(&node->atime); 1625 #endif 1626 1627 return (dev_dkqfilter(dev, ap->a_kn)); 1628 } 1629 1630 /* 1631 * Convert a vnode strategy call into a device strategy call. Vnode strategy 1632 * calls are not limited to device DMA limits so we have to deal with the 1633 * case. 1634 * 1635 * spec_strategy(struct vnode *a_vp, struct bio *a_bio) 1636 */ 1637 static int 1638 devfs_spec_strategy(struct vop_strategy_args *ap) 1639 { 1640 struct bio *bio = ap->a_bio; 1641 struct buf *bp = bio->bio_buf; 1642 struct buf *nbp; 1643 struct vnode *vp; 1644 struct mount *mp; 1645 int chunksize; 1646 int maxiosize; 1647 1648 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL) 1649 buf_start(bp); 1650 1651 /* 1652 * Collect statistics on synchronous and asynchronous read 1653 * and write counts for disks that have associated filesystems. 1654 */ 1655 vp = ap->a_vp; 1656 KKASSERT(vp->v_rdev != NULL); /* XXX */ 1657 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) { 1658 if (bp->b_cmd == BUF_CMD_READ) { 1659 if (bp->b_flags & BIO_SYNC) 1660 mp->mnt_stat.f_syncreads++; 1661 else 1662 mp->mnt_stat.f_asyncreads++; 1663 } else { 1664 if (bp->b_flags & BIO_SYNC) 1665 mp->mnt_stat.f_syncwrites++; 1666 else 1667 mp->mnt_stat.f_asyncwrites++; 1668 } 1669 } 1670 1671 /* 1672 * Device iosize limitations only apply to read and write. Shortcut 1673 * the I/O if it fits. 1674 */ 1675 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) { 1676 devfs_debug(DEVFS_DEBUG_DEBUG, 1677 "%s: si_iosize_max not set!\n", 1678 dev_dname(vp->v_rdev)); 1679 maxiosize = MAXPHYS; 1680 } 1681 #if SPEC_CHAIN_DEBUG & 2 1682 maxiosize = 4096; 1683 #endif 1684 if (bp->b_bcount <= maxiosize || 1685 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) { 1686 dev_dstrategy_chain(vp->v_rdev, bio); 1687 return (0); 1688 } 1689 1690 /* 1691 * Clone the buffer and set up an I/O chain to chunk up the I/O. 1692 */ 1693 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO); 1694 initbufbio(nbp); 1695 buf_dep_init(nbp); 1696 BUF_LOCK(nbp, LK_EXCLUSIVE); 1697 BUF_KERNPROC(nbp); 1698 nbp->b_vp = vp; 1699 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP); 1700 nbp->b_data = bp->b_data; 1701 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1702 nbp->b_bio1.bio_offset = bio->bio_offset; 1703 nbp->b_bio1.bio_caller_info1.ptr = bio; 1704 1705 /* 1706 * Start the first transfer 1707 */ 1708 if (vn_isdisk(vp, NULL)) 1709 chunksize = vp->v_rdev->si_bsize_phys; 1710 else 1711 chunksize = DEV_BSIZE; 1712 chunksize = maxiosize / chunksize * chunksize; 1713 #if SPEC_CHAIN_DEBUG & 1 1714 devfs_debug(DEVFS_DEBUG_DEBUG, 1715 "spec_strategy chained I/O chunksize=%d\n", 1716 chunksize); 1717 #endif 1718 nbp->b_cmd = bp->b_cmd; 1719 nbp->b_bcount = chunksize; 1720 nbp->b_bufsize = chunksize; /* used to detect a short I/O */ 1721 nbp->b_bio1.bio_caller_info2.index = chunksize; 1722 1723 #if SPEC_CHAIN_DEBUG & 1 1724 devfs_debug(DEVFS_DEBUG_DEBUG, 1725 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1726 bp, 0, bp->b_bcount, nbp->b_bcount); 1727 #endif 1728 1729 dev_dstrategy(vp->v_rdev, &nbp->b_bio1); 1730 1731 if (DEVFS_NODE(vp)) { 1732 nanotime(&DEVFS_NODE(vp)->atime); 1733 nanotime(&DEVFS_NODE(vp)->mtime); 1734 } 1735 1736 return (0); 1737 } 1738 1739 /* 1740 * Chunked up transfer completion routine - chain transfers until done 1741 * 1742 * NOTE: MPSAFE callback. 1743 */ 1744 static 1745 void 1746 devfs_spec_strategy_done(struct bio *nbio) 1747 { 1748 struct buf *nbp = nbio->bio_buf; 1749 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */ 1750 struct buf *bp = bio->bio_buf; /* original bp */ 1751 int chunksize = nbio->bio_caller_info2.index; /* chunking */ 1752 int boffset = nbp->b_data - bp->b_data; 1753 1754 if (nbp->b_flags & B_ERROR) { 1755 /* 1756 * An error terminates the chain, propogate the error back 1757 * to the original bp 1758 */ 1759 bp->b_flags |= B_ERROR; 1760 bp->b_error = nbp->b_error; 1761 bp->b_resid = bp->b_bcount - boffset + 1762 (nbp->b_bcount - nbp->b_resid); 1763 #if SPEC_CHAIN_DEBUG & 1 1764 devfs_debug(DEVFS_DEBUG_DEBUG, 1765 "spec_strategy: chain %p error %d bcount %d/%d\n", 1766 bp, bp->b_error, bp->b_bcount, 1767 bp->b_bcount - bp->b_resid); 1768 #endif 1769 } else if (nbp->b_resid) { 1770 /* 1771 * A short read or write terminates the chain 1772 */ 1773 bp->b_error = nbp->b_error; 1774 bp->b_resid = bp->b_bcount - boffset + 1775 (nbp->b_bcount - nbp->b_resid); 1776 #if SPEC_CHAIN_DEBUG & 1 1777 devfs_debug(DEVFS_DEBUG_DEBUG, 1778 "spec_strategy: chain %p short read(1) " 1779 "bcount %d/%d\n", 1780 bp, bp->b_bcount - bp->b_resid, bp->b_bcount); 1781 #endif 1782 } else if (nbp->b_bcount != nbp->b_bufsize) { 1783 /* 1784 * A short read or write can also occur by truncating b_bcount 1785 */ 1786 #if SPEC_CHAIN_DEBUG & 1 1787 devfs_debug(DEVFS_DEBUG_DEBUG, 1788 "spec_strategy: chain %p short read(2) " 1789 "bcount %d/%d\n", 1790 bp, nbp->b_bcount + boffset, bp->b_bcount); 1791 #endif 1792 bp->b_error = 0; 1793 bp->b_bcount = nbp->b_bcount + boffset; 1794 bp->b_resid = nbp->b_resid; 1795 } else if (nbp->b_bcount + boffset == bp->b_bcount) { 1796 /* 1797 * No more data terminates the chain 1798 */ 1799 #if SPEC_CHAIN_DEBUG & 1 1800 devfs_debug(DEVFS_DEBUG_DEBUG, 1801 "spec_strategy: chain %p finished bcount %d\n", 1802 bp, bp->b_bcount); 1803 #endif 1804 bp->b_error = 0; 1805 bp->b_resid = 0; 1806 } else { 1807 /* 1808 * Continue the chain 1809 */ 1810 boffset += nbp->b_bcount; 1811 nbp->b_data = bp->b_data + boffset; 1812 nbp->b_bcount = bp->b_bcount - boffset; 1813 if (nbp->b_bcount > chunksize) 1814 nbp->b_bcount = chunksize; 1815 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1816 nbp->b_bio1.bio_offset = bio->bio_offset + boffset; 1817 1818 #if SPEC_CHAIN_DEBUG & 1 1819 devfs_debug(DEVFS_DEBUG_DEBUG, 1820 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1821 bp, boffset, bp->b_bcount, nbp->b_bcount); 1822 #endif 1823 1824 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1); 1825 return; 1826 } 1827 1828 /* 1829 * Fall through to here on termination. biodone(bp) and 1830 * clean up and free nbp. 1831 */ 1832 biodone(bio); 1833 BUF_UNLOCK(nbp); 1834 uninitbufbio(nbp); 1835 kfree(nbp, M_DEVBUF); 1836 } 1837 1838 /* 1839 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length) 1840 */ 1841 static int 1842 devfs_spec_freeblks(struct vop_freeblks_args *ap) 1843 { 1844 struct buf *bp; 1845 1846 /* 1847 * XXX: This assumes that strategy does the deed right away. 1848 * XXX: this may not be TRTTD. 1849 */ 1850 KKASSERT(ap->a_vp->v_rdev != NULL); 1851 if ((ap->a_vp->v_rdev->si_flags & SI_CANFREE) == 0) 1852 return (0); 1853 bp = geteblk(ap->a_length); 1854 bp->b_cmd = BUF_CMD_FREEBLKS; 1855 bp->b_bio1.bio_offset = ap->a_offset; 1856 bp->b_bcount = ap->a_length; 1857 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1); 1858 return (0); 1859 } 1860 1861 /* 1862 * Implement degenerate case where the block requested is the block 1863 * returned, and assume that the entire device is contiguous in regards 1864 * to the contiguous block range (runp and runb). 1865 * 1866 * spec_bmap(struct vnode *a_vp, off_t a_loffset, 1867 * off_t *a_doffsetp, int *a_runp, int *a_runb) 1868 */ 1869 static int 1870 devfs_spec_bmap(struct vop_bmap_args *ap) 1871 { 1872 if (ap->a_doffsetp != NULL) 1873 *ap->a_doffsetp = ap->a_loffset; 1874 if (ap->a_runp != NULL) 1875 *ap->a_runp = MAXBSIZE; 1876 if (ap->a_runb != NULL) { 1877 if (ap->a_loffset < MAXBSIZE) 1878 *ap->a_runb = (int)ap->a_loffset; 1879 else 1880 *ap->a_runb = MAXBSIZE; 1881 } 1882 return (0); 1883 } 1884 1885 1886 /* 1887 * Special device advisory byte-level locks. 1888 * 1889 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, 1890 * struct flock *a_fl, int a_flags) 1891 */ 1892 /* ARGSUSED */ 1893 static int 1894 devfs_spec_advlock(struct vop_advlock_args *ap) 1895 { 1896 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP); 1897 } 1898 1899 /* 1900 * NOTE: MPSAFE callback. 1901 */ 1902 static void 1903 devfs_spec_getpages_iodone(struct bio *bio) 1904 { 1905 bio->bio_buf->b_cmd = BUF_CMD_DONE; 1906 wakeup(bio->bio_buf); 1907 } 1908 1909 /* 1910 * spec_getpages() - get pages associated with device vnode. 1911 * 1912 * Note that spec_read and spec_write do not use the buffer cache, so we 1913 * must fully implement getpages here. 1914 */ 1915 static int 1916 devfs_spec_getpages(struct vop_getpages_args *ap) 1917 { 1918 vm_offset_t kva; 1919 int error; 1920 int i, pcount, size; 1921 struct buf *bp; 1922 vm_page_t m; 1923 vm_ooffset_t offset; 1924 int toff, nextoff, nread; 1925 struct vnode *vp = ap->a_vp; 1926 int blksiz; 1927 int gotreqpage; 1928 1929 error = 0; 1930 pcount = round_page(ap->a_count) / PAGE_SIZE; 1931 1932 /* 1933 * Calculate the offset of the transfer and do sanity check. 1934 */ 1935 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset; 1936 1937 /* 1938 * Round up physical size for real devices. We cannot round using 1939 * v_mount's block size data because v_mount has nothing to do with 1940 * the device. i.e. it's usually '/dev'. We need the physical block 1941 * size for the device itself. 1942 * 1943 * We can't use v_rdev->si_mountpoint because it only exists when the 1944 * block device is mounted. However, we can use v_rdev. 1945 */ 1946 if (vn_isdisk(vp, NULL)) 1947 blksiz = vp->v_rdev->si_bsize_phys; 1948 else 1949 blksiz = DEV_BSIZE; 1950 1951 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1); 1952 1953 bp = getpbuf_kva(NULL); 1954 kva = (vm_offset_t)bp->b_data; 1955 1956 /* 1957 * Map the pages to be read into the kva. 1958 */ 1959 pmap_qenter(kva, ap->a_m, pcount); 1960 1961 /* Build a minimal buffer header. */ 1962 bp->b_cmd = BUF_CMD_READ; 1963 bp->b_bcount = size; 1964 bp->b_resid = 0; 1965 bsetrunningbufspace(bp, size); 1966 1967 bp->b_bio1.bio_offset = offset; 1968 bp->b_bio1.bio_done = devfs_spec_getpages_iodone; 1969 1970 mycpu->gd_cnt.v_vnodein++; 1971 mycpu->gd_cnt.v_vnodepgsin += pcount; 1972 1973 /* Do the input. */ 1974 vn_strategy(ap->a_vp, &bp->b_bio1); 1975 1976 crit_enter(); 1977 1978 /* We definitely need to be at splbio here. */ 1979 while (bp->b_cmd != BUF_CMD_DONE) 1980 tsleep(bp, 0, "spread", 0); 1981 1982 crit_exit(); 1983 1984 if (bp->b_flags & B_ERROR) { 1985 if (bp->b_error) 1986 error = bp->b_error; 1987 else 1988 error = EIO; 1989 } 1990 1991 /* 1992 * If EOF is encountered we must zero-extend the result in order 1993 * to ensure that the page does not contain garabge. When no 1994 * error occurs, an early EOF is indicated if b_bcount got truncated. 1995 * b_resid is relative to b_bcount and should be 0, but some devices 1996 * might indicate an EOF with b_resid instead of truncating b_bcount. 1997 */ 1998 nread = bp->b_bcount - bp->b_resid; 1999 if (nread < ap->a_count) 2000 bzero((caddr_t)kva + nread, ap->a_count - nread); 2001 pmap_qremove(kva, pcount); 2002 2003 gotreqpage = 0; 2004 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) { 2005 nextoff = toff + PAGE_SIZE; 2006 m = ap->a_m[i]; 2007 2008 m->flags &= ~PG_ZERO; 2009 2010 /* 2011 * NOTE: vm_page_undirty/clear_dirty etc do not clear the 2012 * pmap modified bit. pmap modified bit should have 2013 * already been cleared. 2014 */ 2015 if (nextoff <= nread) { 2016 m->valid = VM_PAGE_BITS_ALL; 2017 vm_page_undirty(m); 2018 } else if (toff < nread) { 2019 /* 2020 * Since this is a VM request, we have to supply the 2021 * unaligned offset to allow vm_page_set_valid() 2022 * to zero sub-DEV_BSIZE'd portions of the page. 2023 */ 2024 vm_page_set_valid(m, 0, nread - toff); 2025 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff); 2026 } else { 2027 m->valid = 0; 2028 vm_page_undirty(m); 2029 } 2030 2031 if (i != ap->a_reqpage) { 2032 /* 2033 * Just in case someone was asking for this page we 2034 * now tell them that it is ok to use. 2035 */ 2036 if (!error || (m->valid == VM_PAGE_BITS_ALL)) { 2037 if (m->valid) { 2038 if (m->flags & PG_REFERENCED) { 2039 vm_page_activate(m); 2040 } else { 2041 vm_page_deactivate(m); 2042 } 2043 vm_page_wakeup(m); 2044 } else { 2045 vm_page_free(m); 2046 } 2047 } else { 2048 vm_page_free(m); 2049 } 2050 } else if (m->valid) { 2051 gotreqpage = 1; 2052 /* 2053 * Since this is a VM request, we need to make the 2054 * entire page presentable by zeroing invalid sections. 2055 */ 2056 if (m->valid != VM_PAGE_BITS_ALL) 2057 vm_page_zero_invalid(m, FALSE); 2058 } 2059 } 2060 if (!gotreqpage) { 2061 m = ap->a_m[ap->a_reqpage]; 2062 devfs_debug(DEVFS_DEBUG_WARNING, 2063 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n", 2064 devtoname(vp->v_rdev), error, bp, bp->b_vp); 2065 devfs_debug(DEVFS_DEBUG_WARNING, 2066 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n", 2067 size, bp->b_resid, ap->a_count, m->valid); 2068 devfs_debug(DEVFS_DEBUG_WARNING, 2069 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n", 2070 nread, ap->a_reqpage, (u_long)m->pindex, pcount); 2071 /* 2072 * Free the buffer header back to the swap buffer pool. 2073 */ 2074 relpbuf(bp, NULL); 2075 return VM_PAGER_ERROR; 2076 } 2077 /* 2078 * Free the buffer header back to the swap buffer pool. 2079 */ 2080 relpbuf(bp, NULL); 2081 if (DEVFS_NODE(ap->a_vp)) 2082 nanotime(&DEVFS_NODE(ap->a_vp)->mtime); 2083 return VM_PAGER_OK; 2084 } 2085 2086 static __inline 2087 int 2088 sequential_heuristic(struct uio *uio, struct file *fp) 2089 { 2090 /* 2091 * Sequential heuristic - detect sequential operation 2092 */ 2093 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || 2094 uio->uio_offset == fp->f_nextoff) { 2095 /* 2096 * XXX we assume that the filesystem block size is 2097 * the default. Not true, but still gives us a pretty 2098 * good indicator of how sequential the read operations 2099 * are. 2100 */ 2101 int tmpseq = fp->f_seqcount; 2102 2103 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE; 2104 if (tmpseq > IO_SEQMAX) 2105 tmpseq = IO_SEQMAX; 2106 fp->f_seqcount = tmpseq; 2107 return(fp->f_seqcount << IO_SEQSHIFT); 2108 } 2109 2110 /* 2111 * Not sequential, quick draw-down of seqcount 2112 */ 2113 if (fp->f_seqcount > 1) 2114 fp->f_seqcount = 1; 2115 else 2116 fp->f_seqcount = 0; 2117 return(0); 2118 } 2119