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/namei.h> 50 #include <sys/dirent.h> 51 #include <sys/malloc.h> 52 #include <sys/stat.h> 53 #include <sys/reg.h> 54 #include <vm/vm_pager.h> 55 #include <vm/vm_zone.h> 56 #include <vm/vm_object.h> 57 #include <sys/filio.h> 58 #include <sys/ttycom.h> 59 #include <sys/tty.h> 60 #include <sys/diskslice.h> 61 #include <sys/sysctl.h> 62 #include <sys/devfs.h> 63 #include <sys/pioctl.h> 64 #include <vfs/fifofs/fifo.h> 65 66 #include <machine/limits.h> 67 68 #include <sys/buf2.h> 69 #include <sys/sysref2.h> 70 #include <sys/mplock2.h> 71 #include <vm/vm_page2.h> 72 73 #ifndef SPEC_CHAIN_DEBUG 74 #define SPEC_CHAIN_DEBUG 0 75 #endif 76 77 MALLOC_DECLARE(M_DEVFS); 78 #define DEVFS_BADOP (void *)devfs_vop_badop 79 80 static int devfs_vop_badop(struct vop_generic_args *); 81 static int devfs_vop_access(struct vop_access_args *); 82 static int devfs_vop_inactive(struct vop_inactive_args *); 83 static int devfs_vop_reclaim(struct vop_reclaim_args *); 84 static int devfs_vop_readdir(struct vop_readdir_args *); 85 static int devfs_vop_getattr(struct vop_getattr_args *); 86 static int devfs_vop_setattr(struct vop_setattr_args *); 87 static int devfs_vop_readlink(struct vop_readlink_args *); 88 static int devfs_vop_print(struct vop_print_args *); 89 90 static int devfs_vop_nresolve(struct vop_nresolve_args *); 91 static int devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); 92 static int devfs_vop_nmkdir(struct vop_nmkdir_args *); 93 static int devfs_vop_nsymlink(struct vop_nsymlink_args *); 94 static int devfs_vop_nrmdir(struct vop_nrmdir_args *); 95 static int devfs_vop_nremove(struct vop_nremove_args *); 96 97 static int devfs_spec_open(struct vop_open_args *); 98 static int devfs_spec_close(struct vop_close_args *); 99 static int devfs_spec_fsync(struct vop_fsync_args *); 100 101 static int devfs_spec_read(struct vop_read_args *); 102 static int devfs_spec_write(struct vop_write_args *); 103 static int devfs_spec_ioctl(struct vop_ioctl_args *); 104 static int devfs_spec_kqfilter(struct vop_kqfilter_args *); 105 static int devfs_spec_strategy(struct vop_strategy_args *); 106 static void devfs_spec_strategy_done(struct bio *); 107 static int devfs_spec_freeblks(struct vop_freeblks_args *); 108 static int devfs_spec_bmap(struct vop_bmap_args *); 109 static int devfs_spec_advlock(struct vop_advlock_args *); 110 static void devfs_spec_getpages_iodone(struct bio *); 111 static int devfs_spec_getpages(struct vop_getpages_args *); 112 113 static int devfs_fo_close(struct file *); 114 static int devfs_fo_read(struct file *, struct uio *, struct ucred *, int); 115 static int devfs_fo_write(struct file *, struct uio *, struct ucred *, int); 116 static int devfs_fo_stat(struct file *, struct stat *, struct ucred *); 117 static int devfs_fo_kqfilter(struct file *, struct knote *); 118 static int devfs_fo_ioctl(struct file *, u_long, caddr_t, 119 struct ucred *, struct sysmsg *); 120 static __inline int sequential_heuristic(struct uio *, struct file *); 121 122 extern struct lock devfs_lock; 123 124 /* 125 * devfs vnode operations for regular files. All vnode ops are MPSAFE. 126 */ 127 struct vop_ops devfs_vnode_norm_vops = { 128 .vop_default = vop_defaultop, 129 .vop_access = devfs_vop_access, 130 .vop_advlock = DEVFS_BADOP, 131 .vop_bmap = DEVFS_BADOP, 132 .vop_close = vop_stdclose, 133 .vop_getattr = devfs_vop_getattr, 134 .vop_inactive = devfs_vop_inactive, 135 .vop_ncreate = DEVFS_BADOP, 136 .vop_nresolve = devfs_vop_nresolve, 137 .vop_nlookupdotdot = devfs_vop_nlookupdotdot, 138 .vop_nlink = DEVFS_BADOP, 139 .vop_nmkdir = devfs_vop_nmkdir, 140 .vop_nmknod = DEVFS_BADOP, 141 .vop_nremove = devfs_vop_nremove, 142 .vop_nrename = DEVFS_BADOP, 143 .vop_nrmdir = devfs_vop_nrmdir, 144 .vop_nsymlink = devfs_vop_nsymlink, 145 .vop_open = vop_stdopen, 146 .vop_pathconf = vop_stdpathconf, 147 .vop_print = devfs_vop_print, 148 .vop_read = DEVFS_BADOP, 149 .vop_readdir = devfs_vop_readdir, 150 .vop_readlink = devfs_vop_readlink, 151 .vop_reclaim = devfs_vop_reclaim, 152 .vop_setattr = devfs_vop_setattr, 153 .vop_write = DEVFS_BADOP, 154 .vop_ioctl = DEVFS_BADOP 155 }; 156 157 /* 158 * devfs vnode operations for character devices. All vnode ops are MPSAFE. 159 */ 160 struct vop_ops devfs_vnode_dev_vops = { 161 .vop_default = vop_defaultop, 162 .vop_access = devfs_vop_access, 163 .vop_advlock = devfs_spec_advlock, 164 .vop_bmap = devfs_spec_bmap, 165 .vop_close = devfs_spec_close, 166 .vop_freeblks = devfs_spec_freeblks, 167 .vop_fsync = devfs_spec_fsync, 168 .vop_getattr = devfs_vop_getattr, 169 .vop_getpages = devfs_spec_getpages, 170 .vop_inactive = devfs_vop_inactive, 171 .vop_open = devfs_spec_open, 172 .vop_pathconf = vop_stdpathconf, 173 .vop_print = devfs_vop_print, 174 .vop_kqfilter = devfs_spec_kqfilter, 175 .vop_read = devfs_spec_read, 176 .vop_readdir = DEVFS_BADOP, 177 .vop_readlink = DEVFS_BADOP, 178 .vop_reclaim = devfs_vop_reclaim, 179 .vop_setattr = devfs_vop_setattr, 180 .vop_strategy = devfs_spec_strategy, 181 .vop_write = devfs_spec_write, 182 .vop_ioctl = devfs_spec_ioctl 183 }; 184 185 /* 186 * devfs file pointer operations. All fileops are MPSAFE. 187 */ 188 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops; 189 190 struct fileops devfs_dev_fileops = { 191 .fo_read = devfs_fo_read, 192 .fo_write = devfs_fo_write, 193 .fo_ioctl = devfs_fo_ioctl, 194 .fo_kqfilter = devfs_fo_kqfilter, 195 .fo_stat = devfs_fo_stat, 196 .fo_close = devfs_fo_close, 197 .fo_shutdown = nofo_shutdown 198 }; 199 200 /* 201 * These two functions are possibly temporary hacks for devices (aka 202 * the pty code) which want to control the node attributes themselves. 203 * 204 * XXX we may ultimately desire to simply remove the uid/gid/mode 205 * from the node entirely. 206 * 207 * MPSAFE - sorta. Theoretically the overwrite can compete since they 208 * are loading from the same fields. 209 */ 210 static __inline void 211 node_sync_dev_get(struct devfs_node *node) 212 { 213 cdev_t dev; 214 215 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) { 216 node->uid = dev->si_uid; 217 node->gid = dev->si_gid; 218 node->mode = dev->si_perms; 219 } 220 } 221 222 static __inline void 223 node_sync_dev_set(struct devfs_node *node) 224 { 225 cdev_t dev; 226 227 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) { 228 dev->si_uid = node->uid; 229 dev->si_gid = node->gid; 230 dev->si_perms = node->mode; 231 } 232 } 233 234 /* 235 * generic entry point for unsupported operations 236 */ 237 static int 238 devfs_vop_badop(struct vop_generic_args *ap) 239 { 240 return (EIO); 241 } 242 243 244 static int 245 devfs_vop_access(struct vop_access_args *ap) 246 { 247 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 248 int error; 249 250 if (!devfs_node_is_accessible(node)) 251 return ENOENT; 252 node_sync_dev_get(node); 253 error = vop_helper_access(ap, node->uid, node->gid, 254 node->mode, node->flags); 255 256 return error; 257 } 258 259 260 static int 261 devfs_vop_inactive(struct vop_inactive_args *ap) 262 { 263 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 264 265 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0) 266 vrecycle(ap->a_vp); 267 return 0; 268 } 269 270 271 static int 272 devfs_vop_reclaim(struct vop_reclaim_args *ap) 273 { 274 struct devfs_node *node; 275 struct vnode *vp; 276 int locked; 277 278 /* 279 * Check if it is locked already. if not, we acquire the devfs lock 280 */ 281 if ((lockstatus(&devfs_lock, curthread)) != LK_EXCLUSIVE) { 282 lockmgr(&devfs_lock, LK_EXCLUSIVE); 283 locked = 1; 284 } else { 285 locked = 0; 286 } 287 288 /* 289 * Get rid of the devfs_node if it is no longer linked into the 290 * topology. 291 */ 292 vp = ap->a_vp; 293 if ((node = DEVFS_NODE(vp)) != NULL) { 294 node->v_node = NULL; 295 if ((node->flags & DEVFS_NODE_LINKED) == 0) 296 devfs_freep(node); 297 } 298 299 if (locked) 300 lockmgr(&devfs_lock, LK_RELEASE); 301 302 /* 303 * v_rdev needs to be properly released using v_release_rdev 304 * Make sure v_data is NULL as well. 305 */ 306 vp->v_data = NULL; 307 v_release_rdev(vp); 308 return 0; 309 } 310 311 312 static int 313 devfs_vop_readdir(struct vop_readdir_args *ap) 314 { 315 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp); 316 struct devfs_node *node; 317 int cookie_index; 318 int ncookies; 319 int error2; 320 int error; 321 int r; 322 off_t *cookies; 323 off_t saveoff; 324 325 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n"); 326 327 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX) 328 return (EINVAL); 329 error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM); 330 if (error) 331 return (error); 332 333 if (!devfs_node_is_accessible(dnode)) { 334 vn_unlock(ap->a_vp); 335 return ENOENT; 336 } 337 338 lockmgr(&devfs_lock, LK_EXCLUSIVE); 339 340 saveoff = ap->a_uio->uio_offset; 341 342 if (ap->a_ncookies) { 343 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */ 344 if (ncookies > 256) 345 ncookies = 256; 346 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK); 347 cookie_index = 0; 348 } else { 349 ncookies = -1; 350 cookies = NULL; 351 cookie_index = 0; 352 } 353 354 nanotime(&dnode->atime); 355 356 if (saveoff == 0) { 357 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino, 358 DT_DIR, 1, "."); 359 if (r) 360 goto done; 361 if (cookies) 362 cookies[cookie_index] = saveoff; 363 saveoff++; 364 cookie_index++; 365 if (cookie_index == ncookies) 366 goto done; 367 } 368 369 if (saveoff == 1) { 370 if (dnode->parent) { 371 r = vop_write_dirent(&error, ap->a_uio, 372 dnode->parent->d_dir.d_ino, 373 DT_DIR, 2, ".."); 374 } else { 375 r = vop_write_dirent(&error, ap->a_uio, 376 dnode->d_dir.d_ino, 377 DT_DIR, 2, ".."); 378 } 379 if (r) 380 goto done; 381 if (cookies) 382 cookies[cookie_index] = saveoff; 383 saveoff++; 384 cookie_index++; 385 if (cookie_index == ncookies) 386 goto done; 387 } 388 389 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 390 if ((node->flags & DEVFS_HIDDEN) || 391 (node->flags & DEVFS_INVISIBLE)) { 392 continue; 393 } 394 395 /* 396 * If the node type is a valid devfs alias, then we make 397 * sure that the target isn't hidden. If it is, we don't 398 * show the link in the directory listing. 399 */ 400 if ((node->node_type == Nlink) && (node->link_target != NULL) && 401 (node->link_target->flags & DEVFS_HIDDEN)) 402 continue; 403 404 if (node->cookie < saveoff) 405 continue; 406 407 saveoff = node->cookie; 408 409 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino, 410 node->d_dir.d_type, 411 node->d_dir.d_namlen, 412 node->d_dir.d_name); 413 414 if (error2) 415 break; 416 417 saveoff++; 418 419 if (cookies) 420 cookies[cookie_index] = node->cookie; 421 ++cookie_index; 422 if (cookie_index == ncookies) 423 break; 424 } 425 426 done: 427 lockmgr(&devfs_lock, LK_RELEASE); 428 vn_unlock(ap->a_vp); 429 430 ap->a_uio->uio_offset = saveoff; 431 if (error && cookie_index == 0) { 432 if (cookies) { 433 kfree(cookies, M_TEMP); 434 *ap->a_ncookies = 0; 435 *ap->a_cookies = NULL; 436 } 437 } else { 438 if (cookies) { 439 *ap->a_ncookies = cookie_index; 440 *ap->a_cookies = cookies; 441 } 442 } 443 return (error); 444 } 445 446 447 static int 448 devfs_vop_nresolve(struct vop_nresolve_args *ap) 449 { 450 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 451 struct devfs_node *node, *found = NULL; 452 struct namecache *ncp; 453 struct vnode *vp = NULL; 454 int error = 0; 455 int len; 456 int depth; 457 458 ncp = ap->a_nch->ncp; 459 len = ncp->nc_nlen; 460 461 if (!devfs_node_is_accessible(dnode)) 462 return ENOENT; 463 464 lockmgr(&devfs_lock, LK_EXCLUSIVE); 465 466 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) { 467 error = ENOENT; 468 cache_setvp(ap->a_nch, NULL); 469 goto out; 470 } 471 472 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 473 if (len == node->d_dir.d_namlen) { 474 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) { 475 found = node; 476 break; 477 } 478 } 479 } 480 481 if (found) { 482 depth = 0; 483 while ((found->node_type == Nlink) && (found->link_target)) { 484 if (depth >= 8) { 485 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8"); 486 break; 487 } 488 489 found = found->link_target; 490 ++depth; 491 } 492 493 if (!(found->flags & DEVFS_HIDDEN)) 494 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp, found); 495 } 496 497 if (vp == NULL) { 498 error = ENOENT; 499 cache_setvp(ap->a_nch, NULL); 500 goto out; 501 502 } 503 KKASSERT(vp); 504 vn_unlock(vp); 505 cache_setvp(ap->a_nch, vp); 506 vrele(vp); 507 out: 508 lockmgr(&devfs_lock, LK_RELEASE); 509 510 return error; 511 } 512 513 514 static int 515 devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 516 { 517 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 518 519 *ap->a_vpp = NULL; 520 if (!devfs_node_is_accessible(dnode)) 521 return ENOENT; 522 523 lockmgr(&devfs_lock, LK_EXCLUSIVE); 524 if (dnode->parent != NULL) { 525 devfs_allocv(ap->a_vpp, dnode->parent); 526 vn_unlock(*ap->a_vpp); 527 } 528 lockmgr(&devfs_lock, LK_RELEASE); 529 530 return ((*ap->a_vpp == NULL) ? ENOENT : 0); 531 } 532 533 534 static int 535 devfs_vop_getattr(struct vop_getattr_args *ap) 536 { 537 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 538 struct vattr *vap = ap->a_vap; 539 struct partinfo pinfo; 540 int error = 0; 541 542 #if 0 543 if (!devfs_node_is_accessible(node)) 544 return ENOENT; 545 #endif 546 node_sync_dev_get(node); 547 548 lockmgr(&devfs_lock, LK_EXCLUSIVE); 549 550 /* start by zeroing out the attributes */ 551 VATTR_NULL(vap); 552 553 /* next do all the common fields */ 554 vap->va_type = ap->a_vp->v_type; 555 vap->va_mode = node->mode; 556 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ; 557 vap->va_flags = 0; 558 vap->va_blocksize = DEV_BSIZE; 559 vap->va_bytes = vap->va_size = 0; 560 561 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; 562 563 vap->va_atime = node->atime; 564 vap->va_mtime = node->mtime; 565 vap->va_ctime = node->ctime; 566 567 vap->va_nlink = 1; /* number of references to file */ 568 569 vap->va_uid = node->uid; 570 vap->va_gid = node->gid; 571 572 vap->va_rmajor = 0; 573 vap->va_rminor = 0; 574 575 if ((node->node_type == Ndev) && node->d_dev) { 576 reference_dev(node->d_dev); 577 vap->va_rminor = node->d_dev->si_uminor; 578 release_dev(node->d_dev); 579 } 580 581 /* For a softlink the va_size is the length of the softlink */ 582 if (node->symlink_name != 0) { 583 vap->va_bytes = vap->va_size = node->symlink_namelen; 584 } 585 586 /* 587 * For a disk-type device, va_size is the size of the underlying 588 * device, so that lseek() works properly. 589 */ 590 if ((node->d_dev) && (dev_dflags(node->d_dev) & D_DISK)) { 591 bzero(&pinfo, sizeof(pinfo)); 592 error = dev_dioctl(node->d_dev, DIOCGPART, (void *)&pinfo, 593 0, proc0.p_ucred, NULL, NULL); 594 if ((error == 0) && (pinfo.media_blksize != 0)) { 595 vap->va_size = pinfo.media_size; 596 } else { 597 vap->va_size = 0; 598 error = 0; 599 } 600 } 601 602 lockmgr(&devfs_lock, LK_RELEASE); 603 604 return (error); 605 } 606 607 608 static int 609 devfs_vop_setattr(struct vop_setattr_args *ap) 610 { 611 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 612 struct vattr *vap; 613 uid_t cur_uid; 614 gid_t cur_gid; 615 mode_t cur_mode; 616 int error = 0; 617 618 if (!devfs_node_is_accessible(node)) 619 return ENOENT; 620 node_sync_dev_get(node); 621 622 lockmgr(&devfs_lock, LK_EXCLUSIVE); 623 624 vap = ap->a_vap; 625 626 if ((vap->va_uid != (uid_t)VNOVAL) || (vap->va_gid != (gid_t)VNOVAL)) { 627 cur_uid = node->uid; 628 cur_gid = node->gid; 629 cur_mode = node->mode; 630 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 631 ap->a_cred, &cur_uid, &cur_gid, &cur_mode); 632 if (error) 633 goto out; 634 635 if (node->uid != cur_uid || node->gid != cur_gid) { 636 node->uid = cur_uid; 637 node->gid = cur_gid; 638 node->mode = cur_mode; 639 } 640 } 641 642 if (vap->va_mode != (mode_t)VNOVAL) { 643 cur_mode = node->mode; 644 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 645 node->uid, node->gid, &cur_mode); 646 if (error == 0 && node->mode != cur_mode) { 647 node->mode = cur_mode; 648 } 649 } 650 651 out: 652 node_sync_dev_set(node); 653 nanotime(&node->ctime); 654 lockmgr(&devfs_lock, LK_RELEASE); 655 656 return error; 657 } 658 659 660 static int 661 devfs_vop_readlink(struct vop_readlink_args *ap) 662 { 663 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 664 int ret; 665 666 if (!devfs_node_is_accessible(node)) 667 return ENOENT; 668 669 lockmgr(&devfs_lock, LK_EXCLUSIVE); 670 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio); 671 lockmgr(&devfs_lock, LK_RELEASE); 672 673 return ret; 674 } 675 676 677 static int 678 devfs_vop_print(struct vop_print_args *ap) 679 { 680 return (0); 681 } 682 683 static int 684 devfs_vop_nmkdir(struct vop_nmkdir_args *ap) 685 { 686 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 687 struct devfs_node *node; 688 689 if (!devfs_node_is_accessible(dnode)) 690 return ENOENT; 691 692 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 693 goto out; 694 695 lockmgr(&devfs_lock, LK_EXCLUSIVE); 696 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Ndir, 697 ap->a_nch->ncp->nc_name, dnode, NULL); 698 699 if (*ap->a_vpp) { 700 node = DEVFS_NODE(*ap->a_vpp); 701 node->flags |= DEVFS_USER_CREATED; 702 cache_setunresolved(ap->a_nch); 703 cache_setvp(ap->a_nch, *ap->a_vpp); 704 } 705 lockmgr(&devfs_lock, LK_RELEASE); 706 out: 707 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 708 } 709 710 static int 711 devfs_vop_nsymlink(struct vop_nsymlink_args *ap) 712 { 713 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 714 struct devfs_node *node; 715 size_t targetlen; 716 717 if (!devfs_node_is_accessible(dnode)) 718 return ENOENT; 719 720 ap->a_vap->va_type = VLNK; 721 722 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 723 goto out; 724 725 lockmgr(&devfs_lock, LK_EXCLUSIVE); 726 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Nlink, 727 ap->a_nch->ncp->nc_name, dnode, NULL); 728 729 targetlen = strlen(ap->a_target); 730 if (*ap->a_vpp) { 731 node = DEVFS_NODE(*ap->a_vpp); 732 node->flags |= DEVFS_USER_CREATED; 733 node->symlink_namelen = targetlen; 734 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK); 735 memcpy(node->symlink_name, ap->a_target, targetlen); 736 node->symlink_name[targetlen] = '\0'; 737 cache_setunresolved(ap->a_nch); 738 cache_setvp(ap->a_nch, *ap->a_vpp); 739 } 740 lockmgr(&devfs_lock, LK_RELEASE); 741 out: 742 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 743 } 744 745 static int 746 devfs_vop_nrmdir(struct vop_nrmdir_args *ap) 747 { 748 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 749 struct devfs_node *node; 750 struct namecache *ncp; 751 int error = ENOENT; 752 753 ncp = ap->a_nch->ncp; 754 755 if (!devfs_node_is_accessible(dnode)) 756 return ENOENT; 757 758 lockmgr(&devfs_lock, LK_EXCLUSIVE); 759 760 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 761 goto out; 762 763 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 764 if (ncp->nc_nlen != node->d_dir.d_namlen) 765 continue; 766 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 767 continue; 768 769 /* 770 * only allow removal of user created dirs 771 */ 772 if ((node->flags & DEVFS_USER_CREATED) == 0) { 773 error = EPERM; 774 goto out; 775 } else if (node->node_type != Ndir) { 776 error = ENOTDIR; 777 goto out; 778 } else if (node->nchildren > 2) { 779 error = ENOTEMPTY; 780 goto out; 781 } else { 782 if (node->v_node) 783 cache_inval_vp(node->v_node, CINV_DESTROY); 784 devfs_unlinkp(node); 785 error = 0; 786 break; 787 } 788 } 789 790 cache_unlink(ap->a_nch); 791 out: 792 lockmgr(&devfs_lock, LK_RELEASE); 793 return error; 794 } 795 796 static int 797 devfs_vop_nremove(struct vop_nremove_args *ap) 798 { 799 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 800 struct devfs_node *node; 801 struct namecache *ncp; 802 int error = ENOENT; 803 804 ncp = ap->a_nch->ncp; 805 806 if (!devfs_node_is_accessible(dnode)) 807 return ENOENT; 808 809 lockmgr(&devfs_lock, LK_EXCLUSIVE); 810 811 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 812 goto out; 813 814 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 815 if (ncp->nc_nlen != node->d_dir.d_namlen) 816 continue; 817 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 818 continue; 819 820 /* 821 * only allow removal of user created stuff (e.g. symlinks) 822 */ 823 if ((node->flags & DEVFS_USER_CREATED) == 0) { 824 error = EPERM; 825 goto out; 826 } else if (node->node_type == Ndir) { 827 error = EISDIR; 828 goto out; 829 } else { 830 if (node->v_node) 831 cache_inval_vp(node->v_node, CINV_DESTROY); 832 devfs_unlinkp(node); 833 error = 0; 834 break; 835 } 836 } 837 838 cache_unlink(ap->a_nch); 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 vn_lock(vp, LK_UPGRADE | LK_RETRY); 866 867 if (node && ap->a_fp) { 868 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n"); 869 lockmgr(&devfs_lock, LK_EXCLUSIVE); 870 871 ndev = devfs_clone(dev, node->d_dir.d_name, 872 node->d_dir.d_namlen, 873 ap->a_mode, ap->a_cred); 874 if (ndev != NULL) { 875 newnode = devfs_create_device_node( 876 DEVFS_MNTDATA(vp->v_mount)->root_node, 877 ndev, NULL, NULL); 878 /* XXX: possibly destroy device if this happens */ 879 880 if (newnode != NULL) { 881 dev = ndev; 882 devfs_link_dev(dev); 883 884 devfs_debug(DEVFS_DEBUG_DEBUG, 885 "parent here is: %s, node is: |%s|\n", 886 ((node->parent->node_type == Nroot) ? 887 "ROOT!" : node->parent->d_dir.d_name), 888 newnode->d_dir.d_name); 889 devfs_debug(DEVFS_DEBUG_DEBUG, 890 "test: %s\n", 891 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name); 892 893 /* 894 * orig_vp is set to the original vp if we cloned. 895 */ 896 /* node->flags |= DEVFS_CLONED; */ 897 devfs_allocv(&vp, newnode); 898 orig_vp = ap->a_vp; 899 ap->a_vp = vp; 900 } 901 } 902 lockmgr(&devfs_lock, LK_RELEASE); 903 /* 904 * Synchronize devfs here to make sure that, if the cloned device 905 * creates other device nodes in addition to the cloned one, 906 * all of them are created by the time we return from opening 907 * the cloned one. 908 */ 909 if (ndev) 910 devfs_config(); 911 } 912 913 devfs_debug(DEVFS_DEBUG_DEBUG, 914 "devfs_spec_open() called on %s! \n", 915 dev->si_name); 916 917 /* 918 * Make this field valid before any I/O in ->d_open 919 */ 920 if (!dev->si_iosize_max) 921 /* XXX: old DFLTPHYS == 64KB dependency */ 922 dev->si_iosize_max = min(MAXPHYS,64*1024); 923 924 if (dev_dflags(dev) & D_TTY) 925 vsetflags(vp, VISTTY); 926 927 /* 928 * Open underlying device 929 */ 930 vn_unlock(vp); 931 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred, ap->a_fp); 932 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 933 934 /* 935 * Clean up any cloned vp if we error out. 936 */ 937 if (error) { 938 if (orig_vp) { 939 vput(vp); 940 ap->a_vp = orig_vp; 941 /* orig_vp = NULL; */ 942 } 943 return error; 944 } 945 946 /* 947 * This checks if the disk device is going to be opened for writing. 948 * It will be only allowed in the cases where securelevel permits it 949 * and it's not mounted R/W. 950 */ 951 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) && 952 (ap->a_cred != FSCRED)) { 953 954 /* Very secure mode. No open for writing allowed */ 955 if (securelevel >= 2) 956 return EPERM; 957 958 /* 959 * If it is mounted R/W, do not allow to open for writing. 960 * In the case it's mounted read-only but securelevel 961 * is >= 1, then do not allow opening for writing either. 962 */ 963 if (vfs_mountedon(vp)) { 964 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY)) 965 return EBUSY; 966 else if (securelevel >= 1) 967 return EPERM; 968 } 969 } 970 971 if (dev_dflags(dev) & D_TTY) { 972 if (dev->si_tty) { 973 struct tty *tp; 974 tp = dev->si_tty; 975 if (!tp->t_stop) { 976 devfs_debug(DEVFS_DEBUG_DEBUG, 977 "devfs: no t_stop\n"); 978 tp->t_stop = nottystop; 979 } 980 } 981 } 982 983 984 if (vn_isdisk(vp, NULL)) { 985 if (!dev->si_bsize_phys) 986 dev->si_bsize_phys = DEV_BSIZE; 987 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1); 988 } 989 990 vop_stdopen(ap); 991 #if 0 992 if (node) 993 nanotime(&node->atime); 994 #endif 995 996 /* 997 * If we replaced the vp the vop_stdopen() call will have loaded 998 * it into fp->f_data and vref()d the vp, giving us two refs. So 999 * instead of just unlocking it here we have to vput() it. 1000 */ 1001 if (orig_vp) 1002 vput(vp); 1003 1004 /* Ugly pty magic, to make pty devices appear once they are opened */ 1005 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) 1006 node->flags &= ~DEVFS_INVISIBLE; 1007 1008 if (ap->a_fp) { 1009 KKASSERT(ap->a_fp->f_type == DTYPE_VNODE); 1010 KKASSERT((ap->a_fp->f_flag & FMASK) == (ap->a_mode & FMASK)); 1011 ap->a_fp->f_ops = &devfs_dev_fileops; 1012 KKASSERT(ap->a_fp->f_data == (void *)vp); 1013 } 1014 1015 return 0; 1016 } 1017 1018 static int 1019 devfs_spec_close(struct vop_close_args *ap) 1020 { 1021 struct devfs_node *node; 1022 struct proc *p = curproc; 1023 struct vnode *vp = ap->a_vp; 1024 cdev_t dev = vp->v_rdev; 1025 int error = 0; 1026 int needrelock; 1027 int opencount; 1028 1029 /* 1030 * We do special tests on the opencount so unfortunately we need 1031 * an exclusive lock. 1032 */ 1033 vn_lock(vp, LK_UPGRADE | LK_RETRY); 1034 1035 if (dev) 1036 devfs_debug(DEVFS_DEBUG_DEBUG, 1037 "devfs_spec_close() called on %s! \n", 1038 dev->si_name); 1039 else 1040 devfs_debug(DEVFS_DEBUG_DEBUG, 1041 "devfs_spec_close() called, null vode!\n"); 1042 1043 /* 1044 * A couple of hacks for devices and tty devices. The 1045 * vnode ref count cannot be used to figure out the 1046 * last close, but we can use v_opencount now that 1047 * revoke works properly. 1048 * 1049 * Detect the last close on a controlling terminal and clear 1050 * the session (half-close). 1051 * 1052 * XXX opencount is not SMP safe. The vnode is locked but there 1053 * may be multiple vnodes referencing the same device. 1054 */ 1055 if (dev) { 1056 /* 1057 * NOTE: Try to avoid global tokens when testing opencount 1058 * XXX hack, fixme. needs a struct lock and opencount in 1059 * struct cdev itself. 1060 */ 1061 reference_dev(dev); 1062 opencount = vp->v_opencount; 1063 if (opencount <= 1) 1064 opencount = count_dev(dev); /* XXX NOT SMP SAFE */ 1065 } else { 1066 opencount = 0; 1067 } 1068 1069 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) { 1070 p->p_session->s_ttyvp = NULL; 1071 vrele(vp); 1072 } 1073 1074 /* 1075 * Vnodes can be opened and closed multiple times. Do not really 1076 * close the device unless (1) it is being closed forcibly, 1077 * (2) the device wants to track closes, or (3) this is the last 1078 * vnode doing its last close on the device. 1079 * 1080 * XXX the VXLOCK (force close) case can leave vnodes referencing 1081 * a closed device. This might not occur now that our revoke is 1082 * fixed. 1083 */ 1084 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n"); 1085 if (dev && ((vp->v_flag & VRECLAIMED) || 1086 (dev_dflags(dev) & D_TRACKCLOSE) || 1087 (opencount == 1))) { 1088 /* 1089 * Ugly pty magic, to make pty devices disappear again once 1090 * they are closed. 1091 */ 1092 node = DEVFS_NODE(ap->a_vp); 1093 if (node && (node->flags & DEVFS_PTY)) 1094 node->flags |= DEVFS_INVISIBLE; 1095 1096 /* 1097 * Unlock around dev_dclose(), unless the vnode is 1098 * undergoing a vgone/reclaim (during umount). 1099 */ 1100 needrelock = 0; 1101 if ((vp->v_flag & VRECLAIMED) == 0 && vn_islocked(vp)) { 1102 needrelock = 1; 1103 vn_unlock(vp); 1104 } 1105 1106 /* 1107 * WARNING! If the device destroys itself the devfs node 1108 * can disappear here. 1109 * 1110 * WARNING! vn_lock() will fail if the vp is in a VRECLAIM, 1111 * which can occur during umount. 1112 */ 1113 error = dev_dclose(dev, ap->a_fflag, S_IFCHR, ap->a_fp); 1114 /* node is now stale */ 1115 1116 if (needrelock) { 1117 if (vn_lock(vp, LK_EXCLUSIVE | 1118 LK_RETRY | 1119 LK_FAILRECLAIM) != 0) { 1120 panic("devfs_spec_close: vnode %p " 1121 "unexpectedly could not be relocked", 1122 vp); 1123 } 1124 } 1125 } else { 1126 error = 0; 1127 } 1128 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n"); 1129 1130 /* 1131 * Track the actual opens and closes on the vnode. The last close 1132 * disassociates the rdev. If the rdev is already disassociated or 1133 * the opencount is already 0, the vnode might have been revoked 1134 * and no further opencount tracking occurs. 1135 */ 1136 if (dev) 1137 release_dev(dev); 1138 if (vp->v_opencount > 0) 1139 vop_stdclose(ap); 1140 return(error); 1141 1142 } 1143 1144 1145 static int 1146 devfs_fo_close(struct file *fp) 1147 { 1148 struct vnode *vp = (struct vnode *)fp->f_data; 1149 int error; 1150 1151 fp->f_ops = &badfileops; 1152 error = vn_close(vp, fp->f_flag, fp); 1153 devfs_clear_cdevpriv(fp); 1154 1155 return (error); 1156 } 1157 1158 1159 /* 1160 * Device-optimized file table vnode read routine. 1161 * 1162 * This bypasses the VOP table and talks directly to the device. Most 1163 * filesystems just route to specfs and can make this optimization. 1164 * 1165 * MPALMOSTSAFE - acquires mplock 1166 */ 1167 static int 1168 devfs_fo_read(struct file *fp, struct uio *uio, 1169 struct ucred *cred, int flags) 1170 { 1171 struct devfs_node *node; 1172 struct vnode *vp; 1173 int ioflag; 1174 int error; 1175 cdev_t dev; 1176 1177 KASSERT(uio->uio_td == curthread, 1178 ("uio_td %p is not td %p", uio->uio_td, curthread)); 1179 1180 if (uio->uio_resid == 0) 1181 return 0; 1182 1183 vp = (struct vnode *)fp->f_data; 1184 if (vp == NULL || vp->v_type == VBAD) 1185 return EBADF; 1186 1187 node = DEVFS_NODE(vp); 1188 1189 if ((dev = vp->v_rdev) == NULL) 1190 return EBADF; 1191 1192 reference_dev(dev); 1193 1194 if ((flags & O_FOFFSET) == 0) 1195 uio->uio_offset = fp->f_offset; 1196 1197 ioflag = 0; 1198 if (flags & O_FBLOCKING) { 1199 /* ioflag &= ~IO_NDELAY; */ 1200 } else if (flags & O_FNONBLOCKING) { 1201 ioflag |= IO_NDELAY; 1202 } else if (fp->f_flag & FNONBLOCK) { 1203 ioflag |= IO_NDELAY; 1204 } 1205 if (flags & O_FBUFFERED) { 1206 /* ioflag &= ~IO_DIRECT; */ 1207 } else if (flags & O_FUNBUFFERED) { 1208 ioflag |= IO_DIRECT; 1209 } else if (fp->f_flag & O_DIRECT) { 1210 ioflag |= IO_DIRECT; 1211 } 1212 ioflag |= sequential_heuristic(uio, fp); 1213 1214 error = dev_dread(dev, uio, ioflag, fp); 1215 1216 release_dev(dev); 1217 if (node) 1218 nanotime(&node->atime); 1219 if ((flags & O_FOFFSET) == 0) 1220 fp->f_offset = uio->uio_offset; 1221 fp->f_nextoff = uio->uio_offset; 1222 1223 return (error); 1224 } 1225 1226 1227 static int 1228 devfs_fo_write(struct file *fp, struct uio *uio, 1229 struct ucred *cred, int flags) 1230 { 1231 struct devfs_node *node; 1232 struct vnode *vp; 1233 int ioflag; 1234 int error; 1235 cdev_t dev; 1236 1237 KASSERT(uio->uio_td == curthread, 1238 ("uio_td %p is not p %p", uio->uio_td, curthread)); 1239 1240 vp = (struct vnode *)fp->f_data; 1241 if (vp == NULL || vp->v_type == VBAD) 1242 return EBADF; 1243 1244 node = DEVFS_NODE(vp); 1245 1246 if (vp->v_type == VREG) 1247 bwillwrite(uio->uio_resid); 1248 1249 vp = (struct vnode *)fp->f_data; 1250 1251 if ((dev = vp->v_rdev) == NULL) 1252 return EBADF; 1253 1254 reference_dev(dev); 1255 1256 if ((flags & O_FOFFSET) == 0) 1257 uio->uio_offset = fp->f_offset; 1258 1259 ioflag = IO_UNIT; 1260 if (vp->v_type == VREG && 1261 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { 1262 ioflag |= IO_APPEND; 1263 } 1264 1265 if (flags & O_FBLOCKING) { 1266 /* ioflag &= ~IO_NDELAY; */ 1267 } else if (flags & O_FNONBLOCKING) { 1268 ioflag |= IO_NDELAY; 1269 } else if (fp->f_flag & FNONBLOCK) { 1270 ioflag |= IO_NDELAY; 1271 } 1272 if (flags & O_FBUFFERED) { 1273 /* ioflag &= ~IO_DIRECT; */ 1274 } else if (flags & O_FUNBUFFERED) { 1275 ioflag |= IO_DIRECT; 1276 } else if (fp->f_flag & O_DIRECT) { 1277 ioflag |= IO_DIRECT; 1278 } 1279 if (flags & O_FASYNCWRITE) { 1280 /* ioflag &= ~IO_SYNC; */ 1281 } else if (flags & O_FSYNCWRITE) { 1282 ioflag |= IO_SYNC; 1283 } else if (fp->f_flag & O_FSYNC) { 1284 ioflag |= IO_SYNC; 1285 } 1286 1287 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) 1288 ioflag |= IO_SYNC; 1289 ioflag |= sequential_heuristic(uio, fp); 1290 1291 error = dev_dwrite(dev, uio, ioflag, fp); 1292 1293 release_dev(dev); 1294 if (node) { 1295 nanotime(&node->atime); 1296 nanotime(&node->mtime); 1297 } 1298 1299 if ((flags & O_FOFFSET) == 0) 1300 fp->f_offset = uio->uio_offset; 1301 fp->f_nextoff = uio->uio_offset; 1302 1303 return (error); 1304 } 1305 1306 1307 static int 1308 devfs_fo_stat(struct file *fp, struct stat *sb, struct ucred *cred) 1309 { 1310 struct vnode *vp; 1311 struct vattr vattr; 1312 struct vattr *vap; 1313 u_short mode; 1314 cdev_t dev; 1315 int error; 1316 1317 vp = (struct vnode *)fp->f_data; 1318 if (vp == NULL || vp->v_type == VBAD) 1319 return EBADF; 1320 1321 error = vn_stat(vp, sb, cred); 1322 if (error) 1323 return (error); 1324 1325 vap = &vattr; 1326 error = VOP_GETATTR(vp, vap); 1327 if (error) 1328 return (error); 1329 1330 /* 1331 * Zero the spare stat fields 1332 */ 1333 sb->st_lspare = 0; 1334 sb->st_qspare1 = 0; 1335 sb->st_qspare2 = 0; 1336 1337 /* 1338 * Copy from vattr table ... or not in case it's a cloned device 1339 */ 1340 if (vap->va_fsid != VNOVAL) 1341 sb->st_dev = vap->va_fsid; 1342 else 1343 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1344 1345 sb->st_ino = vap->va_fileid; 1346 1347 mode = vap->va_mode; 1348 mode |= S_IFCHR; 1349 sb->st_mode = mode; 1350 1351 if (vap->va_nlink > (nlink_t)-1) 1352 sb->st_nlink = (nlink_t)-1; 1353 else 1354 sb->st_nlink = vap->va_nlink; 1355 1356 sb->st_uid = vap->va_uid; 1357 sb->st_gid = vap->va_gid; 1358 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev); 1359 sb->st_size = vap->va_bytes; 1360 sb->st_atimespec = vap->va_atime; 1361 sb->st_mtimespec = vap->va_mtime; 1362 sb->st_ctimespec = vap->va_ctime; 1363 1364 /* 1365 * A VCHR and VBLK device may track the last access and last modified 1366 * time independantly of the filesystem. This is particularly true 1367 * because device read and write calls may bypass the filesystem. 1368 */ 1369 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1370 dev = vp->v_rdev; 1371 if (dev != NULL) { 1372 if (dev->si_lastread) { 1373 sb->st_atimespec.tv_sec = time_second + 1374 (time_uptime - 1375 dev->si_lastread); 1376 sb->st_atimespec.tv_nsec = 0; 1377 } 1378 if (dev->si_lastwrite) { 1379 sb->st_atimespec.tv_sec = time_second + 1380 (time_uptime - 1381 dev->si_lastwrite); 1382 sb->st_atimespec.tv_nsec = 0; 1383 } 1384 } 1385 } 1386 1387 /* 1388 * According to www.opengroup.org, the meaning of st_blksize is 1389 * "a filesystem-specific preferred I/O block size for this 1390 * object. In some filesystem types, this may vary from file 1391 * to file" 1392 * Default to PAGE_SIZE after much discussion. 1393 */ 1394 1395 sb->st_blksize = PAGE_SIZE; 1396 1397 sb->st_flags = vap->va_flags; 1398 1399 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0); 1400 if (error) 1401 sb->st_gen = 0; 1402 else 1403 sb->st_gen = (u_int32_t)vap->va_gen; 1404 1405 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1406 1407 return (0); 1408 } 1409 1410 1411 static int 1412 devfs_fo_kqfilter(struct file *fp, struct knote *kn) 1413 { 1414 struct vnode *vp; 1415 int error; 1416 cdev_t dev; 1417 1418 vp = (struct vnode *)fp->f_data; 1419 if (vp == NULL || vp->v_type == VBAD) { 1420 error = EBADF; 1421 goto done; 1422 } 1423 if ((dev = vp->v_rdev) == NULL) { 1424 error = EBADF; 1425 goto done; 1426 } 1427 reference_dev(dev); 1428 1429 error = dev_dkqfilter(dev, kn, fp); 1430 1431 release_dev(dev); 1432 1433 done: 1434 return (error); 1435 } 1436 1437 /* 1438 * MPALMOSTSAFE - acquires mplock 1439 */ 1440 static int 1441 devfs_fo_ioctl(struct file *fp, u_long com, caddr_t data, 1442 struct ucred *ucred, struct sysmsg *msg) 1443 { 1444 #if 0 1445 struct devfs_node *node; 1446 #endif 1447 struct vnode *vp; 1448 struct vnode *ovp; 1449 cdev_t dev; 1450 int error; 1451 struct fiodname_args *name_args; 1452 size_t namlen; 1453 const char *name; 1454 1455 vp = ((struct vnode *)fp->f_data); 1456 1457 if ((dev = vp->v_rdev) == NULL) 1458 return EBADF; /* device was revoked */ 1459 1460 reference_dev(dev); 1461 1462 #if 0 1463 node = DEVFS_NODE(vp); 1464 #endif 1465 1466 devfs_debug(DEVFS_DEBUG_DEBUG, 1467 "devfs_fo_ioctl() called! for dev %s\n", 1468 dev->si_name); 1469 1470 if (com == FIODTYPE) { 1471 *(int *)data = dev_dflags(dev) & D_TYPEMASK; 1472 error = 0; 1473 goto out; 1474 } else if (com == FIODNAME) { 1475 name_args = (struct fiodname_args *)data; 1476 name = dev->si_name; 1477 namlen = strlen(name) + 1; 1478 1479 devfs_debug(DEVFS_DEBUG_DEBUG, 1480 "ioctl, got: FIODNAME for %s\n", name); 1481 1482 if (namlen <= name_args->len) 1483 error = copyout(dev->si_name, name_args->name, namlen); 1484 else 1485 error = EINVAL; 1486 1487 devfs_debug(DEVFS_DEBUG_DEBUG, 1488 "ioctl stuff: error: %d\n", error); 1489 goto out; 1490 } 1491 1492 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg, fp); 1493 1494 #if 0 1495 if (node) { 1496 nanotime(&node->atime); 1497 nanotime(&node->mtime); 1498 } 1499 #endif 1500 if (com == TIOCSCTTY) { 1501 devfs_debug(DEVFS_DEBUG_DEBUG, 1502 "devfs_fo_ioctl: got TIOCSCTTY on %s\n", 1503 dev->si_name); 1504 } 1505 if (error == 0 && com == TIOCSCTTY) { 1506 struct proc *p = curthread->td_proc; 1507 struct session *sess; 1508 1509 devfs_debug(DEVFS_DEBUG_DEBUG, 1510 "devfs_fo_ioctl: dealing with TIOCSCTTY on %s\n", 1511 dev->si_name); 1512 if (p == NULL) { 1513 error = ENOTTY; 1514 goto out; 1515 } 1516 sess = p->p_session; 1517 1518 /* 1519 * Do nothing if reassigning same control tty 1520 */ 1521 if (sess->s_ttyvp == vp) { 1522 error = 0; 1523 goto out; 1524 } 1525 1526 /* 1527 * Get rid of reference to old control tty 1528 */ 1529 ovp = sess->s_ttyvp; 1530 vref(vp); 1531 sess->s_ttyvp = vp; 1532 if (ovp) 1533 vrele(ovp); 1534 } 1535 1536 out: 1537 release_dev(dev); 1538 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_fo_ioctl() finished! \n"); 1539 return (error); 1540 } 1541 1542 1543 static int 1544 devfs_spec_fsync(struct vop_fsync_args *ap) 1545 { 1546 struct vnode *vp = ap->a_vp; 1547 int error; 1548 1549 if (!vn_isdisk(vp, NULL)) 1550 return (0); 1551 1552 /* 1553 * Flush all dirty buffers associated with a block device. 1554 */ 1555 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL); 1556 return (error); 1557 } 1558 1559 static int 1560 devfs_spec_read(struct vop_read_args *ap) 1561 { 1562 struct devfs_node *node; 1563 struct vnode *vp; 1564 struct uio *uio; 1565 cdev_t dev; 1566 int error; 1567 1568 vp = ap->a_vp; 1569 dev = vp->v_rdev; 1570 uio = ap->a_uio; 1571 node = DEVFS_NODE(vp); 1572 1573 if (dev == NULL) /* device was revoked */ 1574 return (EBADF); 1575 if (uio->uio_resid == 0) 1576 return (0); 1577 1578 vn_unlock(vp); 1579 error = dev_dread(dev, uio, ap->a_ioflag, NULL); 1580 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1581 1582 if (node) 1583 nanotime(&node->atime); 1584 1585 return (error); 1586 } 1587 1588 /* 1589 * Vnode op for write 1590 * 1591 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1592 * struct ucred *a_cred) 1593 */ 1594 static int 1595 devfs_spec_write(struct vop_write_args *ap) 1596 { 1597 struct devfs_node *node; 1598 struct vnode *vp; 1599 struct uio *uio; 1600 cdev_t dev; 1601 int error; 1602 1603 vp = ap->a_vp; 1604 dev = vp->v_rdev; 1605 uio = ap->a_uio; 1606 node = DEVFS_NODE(vp); 1607 1608 KKASSERT(uio->uio_segflg != UIO_NOCOPY); 1609 1610 if (dev == NULL) /* device was revoked */ 1611 return (EBADF); 1612 1613 vn_unlock(vp); 1614 error = dev_dwrite(dev, uio, ap->a_ioflag, NULL); 1615 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1616 1617 if (node) { 1618 nanotime(&node->atime); 1619 nanotime(&node->mtime); 1620 } 1621 1622 return (error); 1623 } 1624 1625 /* 1626 * Device ioctl operation. 1627 * 1628 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, 1629 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg) 1630 */ 1631 static int 1632 devfs_spec_ioctl(struct vop_ioctl_args *ap) 1633 { 1634 struct vnode *vp = ap->a_vp; 1635 #if 0 1636 struct devfs_node *node; 1637 #endif 1638 cdev_t dev; 1639 1640 if ((dev = vp->v_rdev) == NULL) 1641 return (EBADF); /* device was revoked */ 1642 #if 0 1643 node = DEVFS_NODE(vp); 1644 1645 if (node) { 1646 nanotime(&node->atime); 1647 nanotime(&node->mtime); 1648 } 1649 #endif 1650 1651 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag, 1652 ap->a_cred, ap->a_sysmsg, NULL)); 1653 } 1654 1655 /* 1656 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn) 1657 */ 1658 /* ARGSUSED */ 1659 static int 1660 devfs_spec_kqfilter(struct vop_kqfilter_args *ap) 1661 { 1662 struct vnode *vp = ap->a_vp; 1663 #if 0 1664 struct devfs_node *node; 1665 #endif 1666 cdev_t dev; 1667 1668 if ((dev = vp->v_rdev) == NULL) 1669 return (EBADF); /* device was revoked (EBADF) */ 1670 #if 0 1671 node = DEVFS_NODE(vp); 1672 1673 if (node) 1674 nanotime(&node->atime); 1675 #endif 1676 1677 return (dev_dkqfilter(dev, ap->a_kn, NULL)); 1678 } 1679 1680 /* 1681 * Convert a vnode strategy call into a device strategy call. Vnode strategy 1682 * calls are not limited to device DMA limits so we have to deal with the 1683 * case. 1684 * 1685 * spec_strategy(struct vnode *a_vp, struct bio *a_bio) 1686 */ 1687 static int 1688 devfs_spec_strategy(struct vop_strategy_args *ap) 1689 { 1690 struct bio *bio = ap->a_bio; 1691 struct buf *bp = bio->bio_buf; 1692 struct buf *nbp; 1693 struct vnode *vp; 1694 struct mount *mp; 1695 int chunksize; 1696 int maxiosize; 1697 1698 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL) 1699 buf_start(bp); 1700 1701 /* 1702 * Collect statistics on synchronous and asynchronous read 1703 * and write counts for disks that have associated filesystems. 1704 */ 1705 vp = ap->a_vp; 1706 KKASSERT(vp->v_rdev != NULL); /* XXX */ 1707 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) { 1708 if (bp->b_cmd == BUF_CMD_READ) { 1709 if (bp->b_flags & BIO_SYNC) 1710 mp->mnt_stat.f_syncreads++; 1711 else 1712 mp->mnt_stat.f_asyncreads++; 1713 } else { 1714 if (bp->b_flags & BIO_SYNC) 1715 mp->mnt_stat.f_syncwrites++; 1716 else 1717 mp->mnt_stat.f_asyncwrites++; 1718 } 1719 } 1720 1721 /* 1722 * Device iosize limitations only apply to read and write. Shortcut 1723 * the I/O if it fits. 1724 */ 1725 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) { 1726 devfs_debug(DEVFS_DEBUG_DEBUG, 1727 "%s: si_iosize_max not set!\n", 1728 dev_dname(vp->v_rdev)); 1729 maxiosize = MAXPHYS; 1730 } 1731 #if SPEC_CHAIN_DEBUG & 2 1732 maxiosize = 4096; 1733 #endif 1734 if (bp->b_bcount <= maxiosize || 1735 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) { 1736 dev_dstrategy_chain(vp->v_rdev, bio); 1737 return (0); 1738 } 1739 1740 /* 1741 * Clone the buffer and set up an I/O chain to chunk up the I/O. 1742 */ 1743 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO); 1744 initbufbio(nbp); 1745 buf_dep_init(nbp); 1746 BUF_LOCK(nbp, LK_EXCLUSIVE); 1747 BUF_KERNPROC(nbp); 1748 nbp->b_vp = vp; 1749 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP); 1750 nbp->b_data = bp->b_data; 1751 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1752 nbp->b_bio1.bio_offset = bio->bio_offset; 1753 nbp->b_bio1.bio_caller_info1.ptr = bio; 1754 1755 /* 1756 * Start the first transfer 1757 */ 1758 if (vn_isdisk(vp, NULL)) 1759 chunksize = vp->v_rdev->si_bsize_phys; 1760 else 1761 chunksize = DEV_BSIZE; 1762 chunksize = maxiosize / chunksize * chunksize; 1763 #if SPEC_CHAIN_DEBUG & 1 1764 devfs_debug(DEVFS_DEBUG_DEBUG, 1765 "spec_strategy chained I/O chunksize=%d\n", 1766 chunksize); 1767 #endif 1768 nbp->b_cmd = bp->b_cmd; 1769 nbp->b_bcount = chunksize; 1770 nbp->b_bufsize = chunksize; /* used to detect a short I/O */ 1771 nbp->b_bio1.bio_caller_info2.index = chunksize; 1772 1773 #if SPEC_CHAIN_DEBUG & 1 1774 devfs_debug(DEVFS_DEBUG_DEBUG, 1775 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1776 bp, 0, bp->b_bcount, nbp->b_bcount); 1777 #endif 1778 1779 dev_dstrategy(vp->v_rdev, &nbp->b_bio1); 1780 1781 if (DEVFS_NODE(vp)) { 1782 nanotime(&DEVFS_NODE(vp)->atime); 1783 nanotime(&DEVFS_NODE(vp)->mtime); 1784 } 1785 1786 return (0); 1787 } 1788 1789 /* 1790 * Chunked up transfer completion routine - chain transfers until done 1791 * 1792 * NOTE: MPSAFE callback. 1793 */ 1794 static 1795 void 1796 devfs_spec_strategy_done(struct bio *nbio) 1797 { 1798 struct buf *nbp = nbio->bio_buf; 1799 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */ 1800 struct buf *bp = bio->bio_buf; /* original bp */ 1801 int chunksize = nbio->bio_caller_info2.index; /* chunking */ 1802 int boffset = nbp->b_data - bp->b_data; 1803 1804 if (nbp->b_flags & B_ERROR) { 1805 /* 1806 * An error terminates the chain, propogate the error back 1807 * to the original bp 1808 */ 1809 bp->b_flags |= B_ERROR; 1810 bp->b_error = nbp->b_error; 1811 bp->b_resid = bp->b_bcount - boffset + 1812 (nbp->b_bcount - nbp->b_resid); 1813 #if SPEC_CHAIN_DEBUG & 1 1814 devfs_debug(DEVFS_DEBUG_DEBUG, 1815 "spec_strategy: chain %p error %d bcount %d/%d\n", 1816 bp, bp->b_error, bp->b_bcount, 1817 bp->b_bcount - bp->b_resid); 1818 #endif 1819 } else if (nbp->b_resid) { 1820 /* 1821 * A short read or write terminates the chain 1822 */ 1823 bp->b_error = nbp->b_error; 1824 bp->b_resid = bp->b_bcount - boffset + 1825 (nbp->b_bcount - nbp->b_resid); 1826 #if SPEC_CHAIN_DEBUG & 1 1827 devfs_debug(DEVFS_DEBUG_DEBUG, 1828 "spec_strategy: chain %p short read(1) " 1829 "bcount %d/%d\n", 1830 bp, bp->b_bcount - bp->b_resid, bp->b_bcount); 1831 #endif 1832 } else if (nbp->b_bcount != nbp->b_bufsize) { 1833 /* 1834 * A short read or write can also occur by truncating b_bcount 1835 */ 1836 #if SPEC_CHAIN_DEBUG & 1 1837 devfs_debug(DEVFS_DEBUG_DEBUG, 1838 "spec_strategy: chain %p short read(2) " 1839 "bcount %d/%d\n", 1840 bp, nbp->b_bcount + boffset, bp->b_bcount); 1841 #endif 1842 bp->b_error = 0; 1843 bp->b_bcount = nbp->b_bcount + boffset; 1844 bp->b_resid = nbp->b_resid; 1845 } else if (nbp->b_bcount + boffset == bp->b_bcount) { 1846 /* 1847 * No more data terminates the chain 1848 */ 1849 #if SPEC_CHAIN_DEBUG & 1 1850 devfs_debug(DEVFS_DEBUG_DEBUG, 1851 "spec_strategy: chain %p finished bcount %d\n", 1852 bp, bp->b_bcount); 1853 #endif 1854 bp->b_error = 0; 1855 bp->b_resid = 0; 1856 } else { 1857 /* 1858 * Continue the chain 1859 */ 1860 boffset += nbp->b_bcount; 1861 nbp->b_data = bp->b_data + boffset; 1862 nbp->b_bcount = bp->b_bcount - boffset; 1863 if (nbp->b_bcount > chunksize) 1864 nbp->b_bcount = chunksize; 1865 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1866 nbp->b_bio1.bio_offset = bio->bio_offset + boffset; 1867 1868 #if SPEC_CHAIN_DEBUG & 1 1869 devfs_debug(DEVFS_DEBUG_DEBUG, 1870 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1871 bp, boffset, bp->b_bcount, nbp->b_bcount); 1872 #endif 1873 1874 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1); 1875 return; 1876 } 1877 1878 /* 1879 * Fall through to here on termination. biodone(bp) and 1880 * clean up and free nbp. 1881 */ 1882 biodone(bio); 1883 BUF_UNLOCK(nbp); 1884 uninitbufbio(nbp); 1885 kfree(nbp, M_DEVBUF); 1886 } 1887 1888 /* 1889 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length) 1890 */ 1891 static int 1892 devfs_spec_freeblks(struct vop_freeblks_args *ap) 1893 { 1894 struct buf *bp; 1895 1896 /* 1897 * XXX: This assumes that strategy does the deed right away. 1898 * XXX: this may not be TRTTD. 1899 */ 1900 KKASSERT(ap->a_vp->v_rdev != NULL); 1901 if ((ap->a_vp->v_rdev->si_flags & SI_CANFREE) == 0) 1902 return (0); 1903 bp = geteblk(ap->a_length); 1904 bp->b_cmd = BUF_CMD_FREEBLKS; 1905 bp->b_bio1.bio_offset = ap->a_offset; 1906 bp->b_bcount = ap->a_length; 1907 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1); 1908 return (0); 1909 } 1910 1911 /* 1912 * Implement degenerate case where the block requested is the block 1913 * returned, and assume that the entire device is contiguous in regards 1914 * to the contiguous block range (runp and runb). 1915 * 1916 * spec_bmap(struct vnode *a_vp, off_t a_loffset, 1917 * off_t *a_doffsetp, int *a_runp, int *a_runb) 1918 */ 1919 static int 1920 devfs_spec_bmap(struct vop_bmap_args *ap) 1921 { 1922 if (ap->a_doffsetp != NULL) 1923 *ap->a_doffsetp = ap->a_loffset; 1924 if (ap->a_runp != NULL) 1925 *ap->a_runp = MAXBSIZE; 1926 if (ap->a_runb != NULL) { 1927 if (ap->a_loffset < MAXBSIZE) 1928 *ap->a_runb = (int)ap->a_loffset; 1929 else 1930 *ap->a_runb = MAXBSIZE; 1931 } 1932 return (0); 1933 } 1934 1935 1936 /* 1937 * Special device advisory byte-level locks. 1938 * 1939 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, 1940 * struct flock *a_fl, int a_flags) 1941 */ 1942 /* ARGSUSED */ 1943 static int 1944 devfs_spec_advlock(struct vop_advlock_args *ap) 1945 { 1946 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP); 1947 } 1948 1949 /* 1950 * NOTE: MPSAFE callback. 1951 */ 1952 static void 1953 devfs_spec_getpages_iodone(struct bio *bio) 1954 { 1955 bio->bio_buf->b_cmd = BUF_CMD_DONE; 1956 wakeup(bio->bio_buf); 1957 } 1958 1959 /* 1960 * spec_getpages() - get pages associated with device vnode. 1961 * 1962 * Note that spec_read and spec_write do not use the buffer cache, so we 1963 * must fully implement getpages here. 1964 */ 1965 static int 1966 devfs_spec_getpages(struct vop_getpages_args *ap) 1967 { 1968 vm_offset_t kva; 1969 int error; 1970 int i, pcount, size; 1971 struct buf *bp; 1972 vm_page_t m; 1973 vm_ooffset_t offset; 1974 int toff, nextoff, nread; 1975 struct vnode *vp = ap->a_vp; 1976 int blksiz; 1977 int gotreqpage; 1978 1979 error = 0; 1980 pcount = round_page(ap->a_count) / PAGE_SIZE; 1981 1982 /* 1983 * Calculate the offset of the transfer and do sanity check. 1984 */ 1985 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset; 1986 1987 /* 1988 * Round up physical size for real devices. We cannot round using 1989 * v_mount's block size data because v_mount has nothing to do with 1990 * the device. i.e. it's usually '/dev'. We need the physical block 1991 * size for the device itself. 1992 * 1993 * We can't use v_rdev->si_mountpoint because it only exists when the 1994 * block device is mounted. However, we can use v_rdev. 1995 */ 1996 if (vn_isdisk(vp, NULL)) 1997 blksiz = vp->v_rdev->si_bsize_phys; 1998 else 1999 blksiz = DEV_BSIZE; 2000 2001 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1); 2002 2003 bp = getpbuf_kva(NULL); 2004 kva = (vm_offset_t)bp->b_data; 2005 2006 /* 2007 * Map the pages to be read into the kva. 2008 */ 2009 pmap_qenter(kva, ap->a_m, pcount); 2010 2011 /* Build a minimal buffer header. */ 2012 bp->b_cmd = BUF_CMD_READ; 2013 bp->b_bcount = size; 2014 bp->b_resid = 0; 2015 bsetrunningbufspace(bp, size); 2016 2017 bp->b_bio1.bio_offset = offset; 2018 bp->b_bio1.bio_done = devfs_spec_getpages_iodone; 2019 2020 mycpu->gd_cnt.v_vnodein++; 2021 mycpu->gd_cnt.v_vnodepgsin += pcount; 2022 2023 /* Do the input. */ 2024 vn_strategy(ap->a_vp, &bp->b_bio1); 2025 2026 crit_enter(); 2027 2028 /* We definitely need to be at splbio here. */ 2029 while (bp->b_cmd != BUF_CMD_DONE) 2030 tsleep(bp, 0, "spread", 0); 2031 2032 crit_exit(); 2033 2034 if (bp->b_flags & B_ERROR) { 2035 if (bp->b_error) 2036 error = bp->b_error; 2037 else 2038 error = EIO; 2039 } 2040 2041 /* 2042 * If EOF is encountered we must zero-extend the result in order 2043 * to ensure that the page does not contain garabge. When no 2044 * error occurs, an early EOF is indicated if b_bcount got truncated. 2045 * b_resid is relative to b_bcount and should be 0, but some devices 2046 * might indicate an EOF with b_resid instead of truncating b_bcount. 2047 */ 2048 nread = bp->b_bcount - bp->b_resid; 2049 if (nread < ap->a_count) 2050 bzero((caddr_t)kva + nread, ap->a_count - nread); 2051 pmap_qremove(kva, pcount); 2052 2053 gotreqpage = 0; 2054 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) { 2055 nextoff = toff + PAGE_SIZE; 2056 m = ap->a_m[i]; 2057 2058 m->flags &= ~PG_ZERO; 2059 2060 /* 2061 * NOTE: vm_page_undirty/clear_dirty etc do not clear the 2062 * pmap modified bit. pmap modified bit should have 2063 * already been cleared. 2064 */ 2065 if (nextoff <= nread) { 2066 m->valid = VM_PAGE_BITS_ALL; 2067 vm_page_undirty(m); 2068 } else if (toff < nread) { 2069 /* 2070 * Since this is a VM request, we have to supply the 2071 * unaligned offset to allow vm_page_set_valid() 2072 * to zero sub-DEV_BSIZE'd portions of the page. 2073 */ 2074 vm_page_set_valid(m, 0, nread - toff); 2075 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff); 2076 } else { 2077 m->valid = 0; 2078 vm_page_undirty(m); 2079 } 2080 2081 if (i != ap->a_reqpage) { 2082 /* 2083 * Just in case someone was asking for this page we 2084 * now tell them that it is ok to use. 2085 */ 2086 if (!error || (m->valid == VM_PAGE_BITS_ALL)) { 2087 if (m->valid) { 2088 if (m->flags & PG_REFERENCED) { 2089 vm_page_activate(m); 2090 } else { 2091 vm_page_deactivate(m); 2092 } 2093 vm_page_wakeup(m); 2094 } else { 2095 vm_page_free(m); 2096 } 2097 } else { 2098 vm_page_free(m); 2099 } 2100 } else if (m->valid) { 2101 gotreqpage = 1; 2102 /* 2103 * Since this is a VM request, we need to make the 2104 * entire page presentable by zeroing invalid sections. 2105 */ 2106 if (m->valid != VM_PAGE_BITS_ALL) 2107 vm_page_zero_invalid(m, FALSE); 2108 } 2109 } 2110 if (!gotreqpage) { 2111 m = ap->a_m[ap->a_reqpage]; 2112 devfs_debug(DEVFS_DEBUG_WARNING, 2113 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n", 2114 devtoname(vp->v_rdev), error, bp, bp->b_vp); 2115 devfs_debug(DEVFS_DEBUG_WARNING, 2116 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n", 2117 size, bp->b_resid, ap->a_count, m->valid); 2118 devfs_debug(DEVFS_DEBUG_WARNING, 2119 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n", 2120 nread, ap->a_reqpage, (u_long)m->pindex, pcount); 2121 /* 2122 * Free the buffer header back to the swap buffer pool. 2123 */ 2124 relpbuf(bp, NULL); 2125 return VM_PAGER_ERROR; 2126 } 2127 /* 2128 * Free the buffer header back to the swap buffer pool. 2129 */ 2130 relpbuf(bp, NULL); 2131 if (DEVFS_NODE(ap->a_vp)) 2132 nanotime(&DEVFS_NODE(ap->a_vp)->mtime); 2133 return VM_PAGER_OK; 2134 } 2135 2136 static __inline 2137 int 2138 sequential_heuristic(struct uio *uio, struct file *fp) 2139 { 2140 /* 2141 * Sequential heuristic - detect sequential operation 2142 */ 2143 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || 2144 uio->uio_offset == fp->f_nextoff) { 2145 /* 2146 * XXX we assume that the filesystem block size is 2147 * the default. Not true, but still gives us a pretty 2148 * good indicator of how sequential the read operations 2149 * are. 2150 */ 2151 int tmpseq = fp->f_seqcount; 2152 2153 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE; 2154 if (tmpseq > IO_SEQMAX) 2155 tmpseq = IO_SEQMAX; 2156 fp->f_seqcount = tmpseq; 2157 return(fp->f_seqcount << IO_SEQSHIFT); 2158 } 2159 2160 /* 2161 * Not sequential, quick draw-down of seqcount 2162 */ 2163 if (fp->f_seqcount > 1) 2164 fp->f_seqcount = 1; 2165 else 2166 fp->f_seqcount = 0; 2167 return(0); 2168 } 2169