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 <vm/vm_page2.h> 70 71 #ifndef SPEC_CHAIN_DEBUG 72 #define SPEC_CHAIN_DEBUG 0 73 #endif 74 75 MALLOC_DECLARE(M_DEVFS); 76 #define DEVFS_BADOP (void *)devfs_vop_badop 77 78 static int devfs_vop_badop(struct vop_generic_args *); 79 static int devfs_vop_access(struct vop_access_args *); 80 static int devfs_vop_inactive(struct vop_inactive_args *); 81 static int devfs_vop_reclaim(struct vop_reclaim_args *); 82 static int devfs_vop_readdir(struct vop_readdir_args *); 83 static int devfs_vop_getattr(struct vop_getattr_args *); 84 static int devfs_vop_setattr(struct vop_setattr_args *); 85 static int devfs_vop_readlink(struct vop_readlink_args *); 86 static int devfs_vop_print(struct vop_print_args *); 87 88 static int devfs_vop_nresolve(struct vop_nresolve_args *); 89 static int devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); 90 static int devfs_vop_nmkdir(struct vop_nmkdir_args *); 91 static int devfs_vop_nsymlink(struct vop_nsymlink_args *); 92 static int devfs_vop_nrmdir(struct vop_nrmdir_args *); 93 static int devfs_vop_nremove(struct vop_nremove_args *); 94 95 static int devfs_spec_open(struct vop_open_args *); 96 static int devfs_spec_close(struct vop_close_args *); 97 static int devfs_spec_fsync(struct vop_fsync_args *); 98 99 static int devfs_spec_read(struct vop_read_args *); 100 static int devfs_spec_write(struct vop_write_args *); 101 static int devfs_spec_ioctl(struct vop_ioctl_args *); 102 static int devfs_spec_kqfilter(struct vop_kqfilter_args *); 103 static int devfs_spec_strategy(struct vop_strategy_args *); 104 static void devfs_spec_strategy_done(struct bio *); 105 static int devfs_spec_freeblks(struct vop_freeblks_args *); 106 static int devfs_spec_bmap(struct vop_bmap_args *); 107 static int devfs_spec_advlock(struct vop_advlock_args *); 108 static void devfs_spec_getpages_iodone(struct bio *); 109 static int devfs_spec_getpages(struct vop_getpages_args *); 110 111 static int devfs_fo_close(struct file *); 112 static int devfs_fo_read(struct file *, struct uio *, struct ucred *, int); 113 static int devfs_fo_write(struct file *, struct uio *, struct ucred *, int); 114 static int devfs_fo_stat(struct file *, struct stat *, struct ucred *); 115 static int devfs_fo_kqfilter(struct file *, struct knote *); 116 static int devfs_fo_ioctl(struct file *, u_long, caddr_t, 117 struct ucred *, struct sysmsg *); 118 static __inline int sequential_heuristic(struct uio *, struct file *); 119 120 extern struct lock devfs_lock; 121 122 /* 123 * devfs vnode operations for regular files. All vnode ops are MPSAFE. 124 */ 125 struct vop_ops devfs_vnode_norm_vops = { 126 .vop_default = vop_defaultop, 127 .vop_access = devfs_vop_access, 128 .vop_advlock = DEVFS_BADOP, 129 .vop_bmap = DEVFS_BADOP, 130 .vop_close = vop_stdclose, 131 .vop_getattr = devfs_vop_getattr, 132 .vop_inactive = devfs_vop_inactive, 133 .vop_ncreate = DEVFS_BADOP, 134 .vop_nresolve = devfs_vop_nresolve, 135 .vop_nlookupdotdot = devfs_vop_nlookupdotdot, 136 .vop_nlink = DEVFS_BADOP, 137 .vop_nmkdir = devfs_vop_nmkdir, 138 .vop_nmknod = DEVFS_BADOP, 139 .vop_nremove = devfs_vop_nremove, 140 .vop_nrename = DEVFS_BADOP, 141 .vop_nrmdir = devfs_vop_nrmdir, 142 .vop_nsymlink = devfs_vop_nsymlink, 143 .vop_open = vop_stdopen, 144 .vop_pathconf = vop_stdpathconf, 145 .vop_print = devfs_vop_print, 146 .vop_read = DEVFS_BADOP, 147 .vop_readdir = devfs_vop_readdir, 148 .vop_readlink = devfs_vop_readlink, 149 .vop_reallocblks = DEVFS_BADOP, 150 .vop_reclaim = devfs_vop_reclaim, 151 .vop_setattr = devfs_vop_setattr, 152 .vop_write = DEVFS_BADOP, 153 .vop_ioctl = DEVFS_BADOP 154 }; 155 156 /* 157 * devfs vnode operations for character devices. All vnode ops are MPSAFE. 158 */ 159 struct vop_ops devfs_vnode_dev_vops = { 160 .vop_default = vop_defaultop, 161 .vop_access = devfs_vop_access, 162 .vop_advlock = devfs_spec_advlock, 163 .vop_bmap = devfs_spec_bmap, 164 .vop_close = devfs_spec_close, 165 .vop_freeblks = devfs_spec_freeblks, 166 .vop_fsync = devfs_spec_fsync, 167 .vop_getattr = devfs_vop_getattr, 168 .vop_getpages = devfs_spec_getpages, 169 .vop_inactive = devfs_vop_inactive, 170 .vop_open = devfs_spec_open, 171 .vop_pathconf = vop_stdpathconf, 172 .vop_print = devfs_vop_print, 173 .vop_kqfilter = devfs_spec_kqfilter, 174 .vop_read = devfs_spec_read, 175 .vop_readdir = DEVFS_BADOP, 176 .vop_readlink = DEVFS_BADOP, 177 .vop_reallocblks = 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 /* 535 * getattr() - Does not need a lock since the vp is refd 536 */ 537 static int 538 devfs_vop_getattr(struct vop_getattr_args *ap) 539 { 540 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 541 struct vattr *vap = ap->a_vap; 542 struct partinfo pinfo; 543 int error = 0; 544 545 #if 0 546 if (!devfs_node_is_accessible(node)) 547 return ENOENT; 548 #endif 549 550 /* 551 * XXX This is a temporary hack to prevent crashes when the device is 552 * being destroyed (and so the underlying node will be gone) while 553 * a userland program is blocked in a read(). 554 */ 555 if (node == NULL) 556 return EIO; 557 558 node_sync_dev_get(node); 559 560 /* start by zeroing out the attributes */ 561 VATTR_NULL(vap); 562 563 /* next do all the common fields */ 564 vap->va_type = ap->a_vp->v_type; 565 vap->va_mode = node->mode; 566 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ; 567 vap->va_flags = 0; 568 vap->va_blocksize = DEV_BSIZE; 569 vap->va_bytes = vap->va_size = 0; 570 571 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; 572 573 vap->va_atime = node->atime; 574 vap->va_mtime = node->mtime; 575 vap->va_ctime = node->ctime; 576 577 vap->va_nlink = 1; /* number of references to file */ 578 579 vap->va_uid = node->uid; 580 vap->va_gid = node->gid; 581 582 vap->va_rmajor = 0; 583 vap->va_rminor = 0; 584 585 if ((node->node_type == Ndev) && node->d_dev) { 586 reference_dev(node->d_dev); 587 vap->va_rminor = node->d_dev->si_uminor; 588 release_dev(node->d_dev); 589 } 590 591 /* For a softlink the va_size is the length of the softlink */ 592 if (node->symlink_name != 0) { 593 vap->va_bytes = vap->va_size = node->symlink_namelen; 594 } 595 596 /* 597 * For a disk-type device, va_size is the size of the underlying 598 * device, so that lseek() works properly. 599 */ 600 if ((node->d_dev) && (dev_dflags(node->d_dev) & D_DISK)) { 601 bzero(&pinfo, sizeof(pinfo)); 602 error = dev_dioctl(node->d_dev, DIOCGPART, (void *)&pinfo, 603 0, proc0.p_ucred, NULL, NULL); 604 if ((error == 0) && (pinfo.media_blksize != 0)) { 605 vap->va_size = pinfo.media_size; 606 } else { 607 vap->va_size = 0; 608 error = 0; 609 } 610 } 611 612 return (error); 613 } 614 615 static int 616 devfs_vop_setattr(struct vop_setattr_args *ap) 617 { 618 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 619 struct vattr *vap; 620 uid_t cur_uid; 621 gid_t cur_gid; 622 mode_t cur_mode; 623 int error = 0; 624 625 if (!devfs_node_is_accessible(node)) 626 return ENOENT; 627 node_sync_dev_get(node); 628 629 lockmgr(&devfs_lock, LK_EXCLUSIVE); 630 631 vap = ap->a_vap; 632 633 if ((vap->va_uid != (uid_t)VNOVAL) || (vap->va_gid != (gid_t)VNOVAL)) { 634 cur_uid = node->uid; 635 cur_gid = node->gid; 636 cur_mode = node->mode; 637 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, 638 ap->a_cred, &cur_uid, &cur_gid, &cur_mode); 639 if (error) 640 goto out; 641 642 if (node->uid != cur_uid || node->gid != cur_gid) { 643 node->uid = cur_uid; 644 node->gid = cur_gid; 645 node->mode = cur_mode; 646 } 647 } 648 649 if (vap->va_mode != (mode_t)VNOVAL) { 650 cur_mode = node->mode; 651 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, 652 node->uid, node->gid, &cur_mode); 653 if (error == 0 && node->mode != cur_mode) { 654 node->mode = cur_mode; 655 } 656 } 657 658 out: 659 node_sync_dev_set(node); 660 nanotime(&node->ctime); 661 lockmgr(&devfs_lock, LK_RELEASE); 662 663 return error; 664 } 665 666 667 static int 668 devfs_vop_readlink(struct vop_readlink_args *ap) 669 { 670 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 671 int ret; 672 673 if (!devfs_node_is_accessible(node)) 674 return ENOENT; 675 676 lockmgr(&devfs_lock, LK_SHARED); 677 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio); 678 lockmgr(&devfs_lock, LK_RELEASE); 679 680 return ret; 681 } 682 683 684 static int 685 devfs_vop_print(struct vop_print_args *ap) 686 { 687 return (0); 688 } 689 690 static int 691 devfs_vop_nmkdir(struct vop_nmkdir_args *ap) 692 { 693 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 694 struct devfs_node *node; 695 696 if (!devfs_node_is_accessible(dnode)) 697 return ENOENT; 698 699 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 700 goto out; 701 702 lockmgr(&devfs_lock, LK_EXCLUSIVE); 703 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Ndir, 704 ap->a_nch->ncp->nc_name, dnode, NULL); 705 706 if (*ap->a_vpp) { 707 node = DEVFS_NODE(*ap->a_vpp); 708 node->flags |= DEVFS_USER_CREATED; 709 cache_setunresolved(ap->a_nch); 710 cache_setvp(ap->a_nch, *ap->a_vpp); 711 } 712 lockmgr(&devfs_lock, LK_RELEASE); 713 out: 714 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 715 } 716 717 static int 718 devfs_vop_nsymlink(struct vop_nsymlink_args *ap) 719 { 720 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 721 struct devfs_node *node; 722 size_t targetlen; 723 724 if (!devfs_node_is_accessible(dnode)) 725 return ENOENT; 726 727 ap->a_vap->va_type = VLNK; 728 729 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 730 goto out; 731 732 lockmgr(&devfs_lock, LK_EXCLUSIVE); 733 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Nlink, 734 ap->a_nch->ncp->nc_name, dnode, NULL); 735 736 targetlen = strlen(ap->a_target); 737 if (*ap->a_vpp) { 738 node = DEVFS_NODE(*ap->a_vpp); 739 node->flags |= DEVFS_USER_CREATED; 740 node->symlink_namelen = targetlen; 741 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK); 742 memcpy(node->symlink_name, ap->a_target, targetlen); 743 node->symlink_name[targetlen] = '\0'; 744 cache_setunresolved(ap->a_nch); 745 cache_setvp(ap->a_nch, *ap->a_vpp); 746 } 747 lockmgr(&devfs_lock, LK_RELEASE); 748 out: 749 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 750 } 751 752 static int 753 devfs_vop_nrmdir(struct vop_nrmdir_args *ap) 754 { 755 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 756 struct devfs_node *node; 757 struct namecache *ncp; 758 int error = ENOENT; 759 760 ncp = ap->a_nch->ncp; 761 762 if (!devfs_node_is_accessible(dnode)) 763 return ENOENT; 764 765 lockmgr(&devfs_lock, LK_EXCLUSIVE); 766 767 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 768 goto out; 769 770 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 771 if (ncp->nc_nlen != node->d_dir.d_namlen) 772 continue; 773 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 774 continue; 775 776 /* 777 * only allow removal of user created dirs 778 */ 779 if ((node->flags & DEVFS_USER_CREATED) == 0) { 780 error = EPERM; 781 goto out; 782 } else if (node->node_type != Ndir) { 783 error = ENOTDIR; 784 goto out; 785 } else if (node->nchildren > 2) { 786 error = ENOTEMPTY; 787 goto out; 788 } else { 789 if (node->v_node) 790 cache_inval_vp(node->v_node, CINV_DESTROY); 791 devfs_unlinkp(node); 792 error = 0; 793 break; 794 } 795 } 796 797 cache_unlink(ap->a_nch); 798 out: 799 lockmgr(&devfs_lock, LK_RELEASE); 800 return error; 801 } 802 803 static int 804 devfs_vop_nremove(struct vop_nremove_args *ap) 805 { 806 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 807 struct devfs_node *node; 808 struct namecache *ncp; 809 int error = ENOENT; 810 811 ncp = ap->a_nch->ncp; 812 813 if (!devfs_node_is_accessible(dnode)) 814 return ENOENT; 815 816 lockmgr(&devfs_lock, LK_EXCLUSIVE); 817 818 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) 819 goto out; 820 821 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 822 if (ncp->nc_nlen != node->d_dir.d_namlen) 823 continue; 824 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 825 continue; 826 827 /* 828 * only allow removal of user created stuff (e.g. symlinks) 829 */ 830 if ((node->flags & DEVFS_USER_CREATED) == 0) { 831 error = EPERM; 832 goto out; 833 } else if (node->node_type == Ndir) { 834 error = EISDIR; 835 goto out; 836 } else { 837 if (node->v_node) 838 cache_inval_vp(node->v_node, CINV_DESTROY); 839 devfs_unlinkp(node); 840 error = 0; 841 break; 842 } 843 } 844 845 cache_unlink(ap->a_nch); 846 out: 847 lockmgr(&devfs_lock, LK_RELEASE); 848 return error; 849 } 850 851 852 static int 853 devfs_spec_open(struct vop_open_args *ap) 854 { 855 struct vnode *vp = ap->a_vp; 856 struct vnode *orig_vp = NULL; 857 struct devfs_node *node = DEVFS_NODE(vp); 858 struct devfs_node *newnode; 859 cdev_t dev, ndev = NULL; 860 int error = 0; 861 862 if (node) { 863 if (node->d_dev == NULL) 864 return ENXIO; 865 if (!devfs_node_is_accessible(node)) 866 return ENOENT; 867 } 868 869 if ((dev = vp->v_rdev) == NULL) 870 return ENXIO; 871 872 /* 873 * Simple devices that don't care. Retain the shared lock. 874 */ 875 if (dev_dflags(dev) & D_QUICK) { 876 vn_unlock(vp); 877 error = dev_dopen(dev, ap->a_mode, S_IFCHR, 878 ap->a_cred, ap->a_fp); 879 vn_lock(vp, LK_SHARED | LK_RETRY); 880 vop_stdopen(ap); 881 goto skip; 882 } 883 884 /* 885 * Slow code 886 */ 887 vn_lock(vp, LK_UPGRADE | LK_RETRY); 888 if (node && ap->a_fp) { 889 int exists; 890 891 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n"); 892 lockmgr(&devfs_lock, LK_EXCLUSIVE); 893 894 ndev = devfs_clone(dev, node->d_dir.d_name, 895 node->d_dir.d_namlen, 896 ap->a_mode, ap->a_cred); 897 if (ndev != NULL) { 898 newnode = devfs_create_device_node( 899 DEVFS_MNTDATA(vp->v_mount)->root_node, 900 ndev, &exists, NULL, NULL); 901 /* XXX: possibly destroy device if this happens */ 902 903 if (newnode != NULL) { 904 dev = ndev; 905 if (exists == 0) 906 devfs_link_dev(dev); 907 908 devfs_debug(DEVFS_DEBUG_DEBUG, 909 "parent here is: %s, node is: |%s|\n", 910 ((node->parent->node_type == Nroot) ? 911 "ROOT!" : node->parent->d_dir.d_name), 912 newnode->d_dir.d_name); 913 devfs_debug(DEVFS_DEBUG_DEBUG, 914 "test: %s\n", 915 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name); 916 917 /* 918 * orig_vp is set to the original vp if we 919 * cloned. 920 */ 921 /* node->flags |= DEVFS_CLONED; */ 922 devfs_allocv(&vp, newnode); 923 orig_vp = ap->a_vp; 924 ap->a_vp = vp; 925 } 926 } 927 lockmgr(&devfs_lock, LK_RELEASE); 928 929 /* 930 * Synchronize devfs here to make sure that, if the cloned 931 * device creates other device nodes in addition to the 932 * cloned one, all of them are created by the time we return 933 * from opening the cloned one. 934 */ 935 if (ndev) 936 devfs_config(); 937 } 938 939 devfs_debug(DEVFS_DEBUG_DEBUG, 940 "devfs_spec_open() called on %s! \n", 941 dev->si_name); 942 943 /* 944 * Make this field valid before any I/O in ->d_open 945 * 946 * NOTE: Shared vnode lock probably held, but its ok as long 947 * as assignments are consistent. 948 */ 949 if (!dev->si_iosize_max) 950 /* XXX: old DFLTPHYS == 64KB dependency */ 951 dev->si_iosize_max = min(MAXPHYS,64*1024); 952 953 if (dev_dflags(dev) & D_TTY) 954 vsetflags(vp, VISTTY); 955 956 /* 957 * Open the underlying device 958 */ 959 vn_unlock(vp); 960 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred, ap->a_fp); 961 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 962 963 /* 964 * Clean up any cloned vp if we error out. 965 */ 966 if (error) { 967 if (orig_vp) { 968 vput(vp); 969 ap->a_vp = orig_vp; 970 /* orig_vp = NULL; */ 971 } 972 return error; 973 } 974 975 /* 976 * This checks if the disk device is going to be opened for writing. 977 * It will be only allowed in the cases where securelevel permits it 978 * and it's not mounted R/W. 979 */ 980 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) && 981 (ap->a_cred != FSCRED)) { 982 983 /* Very secure mode. No open for writing allowed */ 984 if (securelevel >= 2) 985 return EPERM; 986 987 /* 988 * If it is mounted R/W, do not allow to open for writing. 989 * In the case it's mounted read-only but securelevel 990 * is >= 1, then do not allow opening for writing either. 991 */ 992 if (vfs_mountedon(vp)) { 993 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY)) 994 return EBUSY; 995 else if (securelevel >= 1) 996 return EPERM; 997 } 998 } 999 1000 /* 1001 * NOTE: vnode is still locked shared. t_stop assignment should 1002 * remain consistent so we should be ok. 1003 */ 1004 if (dev_dflags(dev) & D_TTY) { 1005 if (dev->si_tty) { 1006 struct tty *tp; 1007 tp = dev->si_tty; 1008 if (!tp->t_stop) { 1009 devfs_debug(DEVFS_DEBUG_DEBUG, 1010 "devfs: no t_stop\n"); 1011 tp->t_stop = nottystop; 1012 } 1013 } 1014 } 1015 1016 /* 1017 * NOTE: vnode is still locked shared. assignments should 1018 * remain consistent so we should be ok. However, 1019 * upgrade to exclusive if we need a VM object. 1020 */ 1021 if (vn_isdisk(vp, NULL)) { 1022 if (!dev->si_bsize_phys) 1023 dev->si_bsize_phys = DEV_BSIZE; 1024 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1); 1025 } 1026 1027 vop_stdopen(ap); 1028 #if 0 1029 if (node) 1030 nanotime(&node->atime); 1031 #endif 1032 /* 1033 * If we replaced the vp the vop_stdopen() call will have loaded 1034 * it into fp->f_data and vref()d the vp, giving us two refs. So 1035 * instead of just unlocking it here we have to vput() it. 1036 */ 1037 if (orig_vp) 1038 vput(vp); 1039 1040 /* Ugly pty magic, to make pty devices appear once they are opened */ 1041 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) { 1042 if (node->flags & DEVFS_INVISIBLE) 1043 node->flags &= ~DEVFS_INVISIBLE; 1044 } 1045 1046 skip: 1047 if (ap->a_fp) { 1048 KKASSERT(ap->a_fp->f_type == DTYPE_VNODE); 1049 KKASSERT((ap->a_fp->f_flag & FMASK) == (ap->a_mode & FMASK)); 1050 ap->a_fp->f_ops = &devfs_dev_fileops; 1051 KKASSERT(ap->a_fp->f_data == (void *)vp); 1052 } 1053 1054 return 0; 1055 } 1056 1057 static int 1058 devfs_spec_close(struct vop_close_args *ap) 1059 { 1060 struct devfs_node *node; 1061 struct proc *p = curproc; 1062 struct vnode *vp = ap->a_vp; 1063 cdev_t dev = vp->v_rdev; 1064 int error = 0; 1065 int needrelock; 1066 int opencount; 1067 1068 /* 1069 * Devices flagged D_QUICK require no special handling. 1070 */ 1071 if (dev && dev_dflags(dev) & D_QUICK) { 1072 opencount = vp->v_opencount; 1073 if (opencount <= 1) 1074 opencount = count_dev(dev); /* XXX NOT SMP SAFE */ 1075 if (((vp->v_flag & VRECLAIMED) || 1076 (dev_dflags(dev) & D_TRACKCLOSE) || 1077 (opencount == 1))) { 1078 vn_unlock(vp); 1079 error = dev_dclose(dev, ap->a_fflag, S_IFCHR, ap->a_fp); 1080 vn_lock(vp, LK_SHARED | LK_RETRY); 1081 } 1082 goto skip; 1083 } 1084 1085 /* 1086 * We do special tests on the opencount so unfortunately we need 1087 * an exclusive lock. 1088 */ 1089 vn_lock(vp, LK_UPGRADE | LK_RETRY); 1090 1091 if (dev) 1092 devfs_debug(DEVFS_DEBUG_DEBUG, 1093 "devfs_spec_close() called on %s! \n", 1094 dev->si_name); 1095 else 1096 devfs_debug(DEVFS_DEBUG_DEBUG, 1097 "devfs_spec_close() called, null vode!\n"); 1098 1099 /* 1100 * A couple of hacks for devices and tty devices. The 1101 * vnode ref count cannot be used to figure out the 1102 * last close, but we can use v_opencount now that 1103 * revoke works properly. 1104 * 1105 * Detect the last close on a controlling terminal and clear 1106 * the session (half-close). 1107 * 1108 * XXX opencount is not SMP safe. The vnode is locked but there 1109 * may be multiple vnodes referencing the same device. 1110 */ 1111 if (dev) { 1112 /* 1113 * NOTE: Try to avoid global tokens when testing opencount 1114 * XXX hack, fixme. needs a struct lock and opencount in 1115 * struct cdev itself. 1116 */ 1117 reference_dev(dev); 1118 opencount = vp->v_opencount; 1119 if (opencount <= 1) 1120 opencount = count_dev(dev); /* XXX NOT SMP SAFE */ 1121 } else { 1122 opencount = 0; 1123 } 1124 1125 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) { 1126 p->p_session->s_ttyvp = NULL; 1127 vrele(vp); 1128 } 1129 1130 /* 1131 * Vnodes can be opened and closed multiple times. Do not really 1132 * close the device unless (1) it is being closed forcibly, 1133 * (2) the device wants to track closes, or (3) this is the last 1134 * vnode doing its last close on the device. 1135 * 1136 * XXX the VXLOCK (force close) case can leave vnodes referencing 1137 * a closed device. This might not occur now that our revoke is 1138 * fixed. 1139 */ 1140 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n"); 1141 if (dev && ((vp->v_flag & VRECLAIMED) || 1142 (dev_dflags(dev) & D_TRACKCLOSE) || 1143 (opencount == 1))) { 1144 /* 1145 * Ugly pty magic, to make pty devices disappear again once 1146 * they are closed. 1147 */ 1148 node = DEVFS_NODE(ap->a_vp); 1149 if (node && (node->flags & DEVFS_PTY)) 1150 node->flags |= DEVFS_INVISIBLE; 1151 1152 /* 1153 * Unlock around dev_dclose(), unless the vnode is 1154 * undergoing a vgone/reclaim (during umount). 1155 */ 1156 needrelock = 0; 1157 if ((vp->v_flag & VRECLAIMED) == 0 && vn_islocked(vp)) { 1158 needrelock = 1; 1159 vn_unlock(vp); 1160 } 1161 1162 /* 1163 * WARNING! If the device destroys itself the devfs node 1164 * can disappear here. 1165 * 1166 * WARNING! vn_lock() will fail if the vp is in a VRECLAIM, 1167 * which can occur during umount. 1168 */ 1169 error = dev_dclose(dev, ap->a_fflag, S_IFCHR, ap->a_fp); 1170 /* node is now stale */ 1171 1172 if (needrelock) { 1173 if (vn_lock(vp, LK_EXCLUSIVE | 1174 LK_RETRY | 1175 LK_FAILRECLAIM) != 0) { 1176 panic("devfs_spec_close: vnode %p " 1177 "unexpectedly could not be relocked", 1178 vp); 1179 } 1180 } 1181 } else { 1182 error = 0; 1183 } 1184 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n"); 1185 1186 /* 1187 * Track the actual opens and closes on the vnode. The last close 1188 * disassociates the rdev. If the rdev is already disassociated or 1189 * the opencount is already 0, the vnode might have been revoked 1190 * and no further opencount tracking occurs. 1191 */ 1192 if (dev) 1193 release_dev(dev); 1194 skip: 1195 if (vp->v_opencount > 0) 1196 vop_stdclose(ap); 1197 return(error); 1198 1199 } 1200 1201 1202 static int 1203 devfs_fo_close(struct file *fp) 1204 { 1205 struct vnode *vp = (struct vnode *)fp->f_data; 1206 int error; 1207 1208 fp->f_ops = &badfileops; 1209 error = vn_close(vp, fp->f_flag, fp); 1210 devfs_clear_cdevpriv(fp); 1211 1212 return (error); 1213 } 1214 1215 1216 /* 1217 * Device-optimized file table vnode read routine. 1218 * 1219 * This bypasses the VOP table and talks directly to the device. Most 1220 * filesystems just route to specfs and can make this optimization. 1221 */ 1222 static int 1223 devfs_fo_read(struct file *fp, struct uio *uio, 1224 struct ucred *cred, int flags) 1225 { 1226 struct devfs_node *node; 1227 struct vnode *vp; 1228 int ioflag; 1229 int error; 1230 cdev_t dev; 1231 1232 KASSERT(uio->uio_td == curthread, 1233 ("uio_td %p is not td %p", uio->uio_td, curthread)); 1234 1235 if (uio->uio_resid == 0) 1236 return 0; 1237 1238 vp = (struct vnode *)fp->f_data; 1239 if (vp == NULL || vp->v_type == VBAD) 1240 return EBADF; 1241 1242 node = DEVFS_NODE(vp); 1243 1244 if ((dev = vp->v_rdev) == NULL) 1245 return EBADF; 1246 1247 reference_dev(dev); 1248 1249 if ((flags & O_FOFFSET) == 0) 1250 uio->uio_offset = fp->f_offset; 1251 1252 ioflag = 0; 1253 if (flags & O_FBLOCKING) { 1254 /* ioflag &= ~IO_NDELAY; */ 1255 } else if (flags & O_FNONBLOCKING) { 1256 ioflag |= IO_NDELAY; 1257 } else if (fp->f_flag & FNONBLOCK) { 1258 ioflag |= IO_NDELAY; 1259 } 1260 if (fp->f_flag & O_DIRECT) { 1261 ioflag |= IO_DIRECT; 1262 } 1263 ioflag |= sequential_heuristic(uio, fp); 1264 1265 error = dev_dread(dev, uio, ioflag, fp); 1266 1267 release_dev(dev); 1268 if (node) 1269 nanotime(&node->atime); 1270 if ((flags & O_FOFFSET) == 0) 1271 fp->f_offset = uio->uio_offset; 1272 fp->f_nextoff = uio->uio_offset; 1273 1274 return (error); 1275 } 1276 1277 1278 static int 1279 devfs_fo_write(struct file *fp, struct uio *uio, 1280 struct ucred *cred, int flags) 1281 { 1282 struct devfs_node *node; 1283 struct vnode *vp; 1284 int ioflag; 1285 int error; 1286 cdev_t dev; 1287 1288 KASSERT(uio->uio_td == curthread, 1289 ("uio_td %p is not p %p", uio->uio_td, curthread)); 1290 1291 vp = (struct vnode *)fp->f_data; 1292 if (vp == NULL || vp->v_type == VBAD) 1293 return EBADF; 1294 1295 node = DEVFS_NODE(vp); 1296 1297 if (vp->v_type == VREG) 1298 bwillwrite(uio->uio_resid); 1299 1300 vp = (struct vnode *)fp->f_data; 1301 1302 if ((dev = vp->v_rdev) == NULL) 1303 return EBADF; 1304 1305 reference_dev(dev); 1306 1307 if ((flags & O_FOFFSET) == 0) 1308 uio->uio_offset = fp->f_offset; 1309 1310 ioflag = IO_UNIT; 1311 if (vp->v_type == VREG && 1312 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { 1313 ioflag |= IO_APPEND; 1314 } 1315 1316 if (flags & O_FBLOCKING) { 1317 /* ioflag &= ~IO_NDELAY; */ 1318 } else if (flags & O_FNONBLOCKING) { 1319 ioflag |= IO_NDELAY; 1320 } else if (fp->f_flag & FNONBLOCK) { 1321 ioflag |= IO_NDELAY; 1322 } 1323 if (fp->f_flag & O_DIRECT) { 1324 ioflag |= IO_DIRECT; 1325 } 1326 if (flags & O_FASYNCWRITE) { 1327 /* ioflag &= ~IO_SYNC; */ 1328 } else if (flags & O_FSYNCWRITE) { 1329 ioflag |= IO_SYNC; 1330 } else if (fp->f_flag & O_FSYNC) { 1331 ioflag |= IO_SYNC; 1332 } 1333 1334 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) 1335 ioflag |= IO_SYNC; 1336 ioflag |= sequential_heuristic(uio, fp); 1337 1338 error = dev_dwrite(dev, uio, ioflag, fp); 1339 1340 release_dev(dev); 1341 if (node) { 1342 nanotime(&node->atime); 1343 nanotime(&node->mtime); 1344 } 1345 1346 if ((flags & O_FOFFSET) == 0) 1347 fp->f_offset = uio->uio_offset; 1348 fp->f_nextoff = uio->uio_offset; 1349 1350 return (error); 1351 } 1352 1353 1354 static int 1355 devfs_fo_stat(struct file *fp, struct stat *sb, struct ucred *cred) 1356 { 1357 struct vnode *vp; 1358 struct vattr vattr; 1359 struct vattr *vap; 1360 u_short mode; 1361 cdev_t dev; 1362 int error; 1363 1364 vp = (struct vnode *)fp->f_data; 1365 if (vp == NULL || vp->v_type == VBAD) 1366 return EBADF; 1367 1368 error = vn_stat(vp, sb, cred); 1369 if (error) 1370 return (error); 1371 1372 vap = &vattr; 1373 error = VOP_GETATTR(vp, vap); 1374 if (error) 1375 return (error); 1376 1377 /* 1378 * Zero the spare stat fields 1379 */ 1380 sb->st_lspare = 0; 1381 sb->st_qspare1 = 0; 1382 sb->st_qspare2 = 0; 1383 1384 /* 1385 * Copy from vattr table ... or not in case it's a cloned device 1386 */ 1387 if (vap->va_fsid != VNOVAL) 1388 sb->st_dev = vap->va_fsid; 1389 else 1390 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1391 1392 sb->st_ino = vap->va_fileid; 1393 1394 mode = vap->va_mode; 1395 mode |= S_IFCHR; 1396 sb->st_mode = mode; 1397 1398 if (vap->va_nlink > (nlink_t)-1) 1399 sb->st_nlink = (nlink_t)-1; 1400 else 1401 sb->st_nlink = vap->va_nlink; 1402 1403 sb->st_uid = vap->va_uid; 1404 sb->st_gid = vap->va_gid; 1405 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev); 1406 sb->st_size = vap->va_bytes; 1407 sb->st_atimespec = vap->va_atime; 1408 sb->st_mtimespec = vap->va_mtime; 1409 sb->st_ctimespec = vap->va_ctime; 1410 1411 /* 1412 * A VCHR and VBLK device may track the last access and last modified 1413 * time independantly of the filesystem. This is particularly true 1414 * because device read and write calls may bypass the filesystem. 1415 */ 1416 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1417 dev = vp->v_rdev; 1418 if (dev != NULL) { 1419 if (dev->si_lastread) { 1420 sb->st_atimespec.tv_sec = time_second + 1421 (time_uptime - 1422 dev->si_lastread); 1423 sb->st_atimespec.tv_nsec = 0; 1424 } 1425 if (dev->si_lastwrite) { 1426 sb->st_atimespec.tv_sec = time_second + 1427 (time_uptime - 1428 dev->si_lastwrite); 1429 sb->st_atimespec.tv_nsec = 0; 1430 } 1431 } 1432 } 1433 1434 /* 1435 * According to www.opengroup.org, the meaning of st_blksize is 1436 * "a filesystem-specific preferred I/O block size for this 1437 * object. In some filesystem types, this may vary from file 1438 * to file" 1439 * Default to PAGE_SIZE after much discussion. 1440 */ 1441 1442 sb->st_blksize = PAGE_SIZE; 1443 1444 sb->st_flags = vap->va_flags; 1445 1446 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0); 1447 if (error) 1448 sb->st_gen = 0; 1449 else 1450 sb->st_gen = (u_int32_t)vap->va_gen; 1451 1452 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1453 1454 return (0); 1455 } 1456 1457 1458 static int 1459 devfs_fo_kqfilter(struct file *fp, struct knote *kn) 1460 { 1461 struct vnode *vp; 1462 int error; 1463 cdev_t dev; 1464 1465 vp = (struct vnode *)fp->f_data; 1466 if (vp == NULL || vp->v_type == VBAD) { 1467 error = EBADF; 1468 goto done; 1469 } 1470 if ((dev = vp->v_rdev) == NULL) { 1471 error = EBADF; 1472 goto done; 1473 } 1474 reference_dev(dev); 1475 1476 error = dev_dkqfilter(dev, kn, fp); 1477 1478 release_dev(dev); 1479 1480 done: 1481 return (error); 1482 } 1483 1484 static int 1485 devfs_fo_ioctl(struct file *fp, u_long com, caddr_t data, 1486 struct ucred *ucred, struct sysmsg *msg) 1487 { 1488 #if 0 1489 struct devfs_node *node; 1490 #endif 1491 struct vnode *vp; 1492 struct vnode *ovp; 1493 cdev_t dev; 1494 int error; 1495 struct fiodname_args *name_args; 1496 size_t namlen; 1497 const char *name; 1498 1499 vp = ((struct vnode *)fp->f_data); 1500 1501 if ((dev = vp->v_rdev) == NULL) 1502 return EBADF; /* device was revoked */ 1503 1504 reference_dev(dev); 1505 1506 #if 0 1507 node = DEVFS_NODE(vp); 1508 #endif 1509 1510 devfs_debug(DEVFS_DEBUG_DEBUG, 1511 "devfs_fo_ioctl() called! for dev %s\n", 1512 dev->si_name); 1513 1514 if (com == FIODTYPE) { 1515 *(int *)data = dev_dflags(dev) & D_TYPEMASK; 1516 error = 0; 1517 goto out; 1518 } else if (com == FIODNAME) { 1519 name_args = (struct fiodname_args *)data; 1520 name = dev->si_name; 1521 namlen = strlen(name) + 1; 1522 1523 devfs_debug(DEVFS_DEBUG_DEBUG, 1524 "ioctl, got: FIODNAME for %s\n", name); 1525 1526 if (namlen <= name_args->len) 1527 error = copyout(dev->si_name, name_args->name, namlen); 1528 else 1529 error = EINVAL; 1530 1531 devfs_debug(DEVFS_DEBUG_DEBUG, 1532 "ioctl stuff: error: %d\n", error); 1533 goto out; 1534 } 1535 1536 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg, fp); 1537 1538 #if 0 1539 if (node) { 1540 nanotime(&node->atime); 1541 nanotime(&node->mtime); 1542 } 1543 #endif 1544 if (com == TIOCSCTTY) { 1545 devfs_debug(DEVFS_DEBUG_DEBUG, 1546 "devfs_fo_ioctl: got TIOCSCTTY on %s\n", 1547 dev->si_name); 1548 } 1549 if (error == 0 && com == TIOCSCTTY) { 1550 struct proc *p = curthread->td_proc; 1551 struct session *sess; 1552 1553 devfs_debug(DEVFS_DEBUG_DEBUG, 1554 "devfs_fo_ioctl: dealing with TIOCSCTTY on %s\n", 1555 dev->si_name); 1556 if (p == NULL) { 1557 error = ENOTTY; 1558 goto out; 1559 } 1560 sess = p->p_session; 1561 1562 /* 1563 * Do nothing if reassigning same control tty 1564 */ 1565 if (sess->s_ttyvp == vp) { 1566 error = 0; 1567 goto out; 1568 } 1569 1570 /* 1571 * Get rid of reference to old control tty 1572 */ 1573 ovp = sess->s_ttyvp; 1574 vref(vp); 1575 sess->s_ttyvp = vp; 1576 if (ovp) 1577 vrele(ovp); 1578 } 1579 1580 out: 1581 release_dev(dev); 1582 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_fo_ioctl() finished! \n"); 1583 return (error); 1584 } 1585 1586 1587 static int 1588 devfs_spec_fsync(struct vop_fsync_args *ap) 1589 { 1590 struct vnode *vp = ap->a_vp; 1591 int error; 1592 1593 if (!vn_isdisk(vp, NULL)) 1594 return (0); 1595 1596 /* 1597 * Flush all dirty buffers associated with a block device. 1598 */ 1599 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL); 1600 return (error); 1601 } 1602 1603 static int 1604 devfs_spec_read(struct vop_read_args *ap) 1605 { 1606 struct devfs_node *node; 1607 struct vnode *vp; 1608 struct uio *uio; 1609 cdev_t dev; 1610 int error; 1611 1612 vp = ap->a_vp; 1613 dev = vp->v_rdev; 1614 uio = ap->a_uio; 1615 node = DEVFS_NODE(vp); 1616 1617 if (dev == NULL) /* device was revoked */ 1618 return (EBADF); 1619 if (uio->uio_resid == 0) 1620 return (0); 1621 1622 vn_unlock(vp); 1623 error = dev_dread(dev, uio, ap->a_ioflag, NULL); 1624 vn_lock(vp, LK_SHARED | LK_RETRY); 1625 1626 if (node) 1627 nanotime(&node->atime); 1628 1629 return (error); 1630 } 1631 1632 /* 1633 * Vnode op for write 1634 * 1635 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1636 * struct ucred *a_cred) 1637 */ 1638 static int 1639 devfs_spec_write(struct vop_write_args *ap) 1640 { 1641 struct devfs_node *node; 1642 struct vnode *vp; 1643 struct uio *uio; 1644 cdev_t dev; 1645 int error; 1646 1647 vp = ap->a_vp; 1648 dev = vp->v_rdev; 1649 uio = ap->a_uio; 1650 node = DEVFS_NODE(vp); 1651 1652 KKASSERT(uio->uio_segflg != UIO_NOCOPY); 1653 1654 if (dev == NULL) /* device was revoked */ 1655 return (EBADF); 1656 1657 vn_unlock(vp); 1658 error = dev_dwrite(dev, uio, ap->a_ioflag, NULL); 1659 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1660 1661 if (node) { 1662 nanotime(&node->atime); 1663 nanotime(&node->mtime); 1664 } 1665 1666 return (error); 1667 } 1668 1669 /* 1670 * Device ioctl operation. 1671 * 1672 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, 1673 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg) 1674 */ 1675 static int 1676 devfs_spec_ioctl(struct vop_ioctl_args *ap) 1677 { 1678 struct vnode *vp = ap->a_vp; 1679 #if 0 1680 struct devfs_node *node; 1681 #endif 1682 cdev_t dev; 1683 1684 if ((dev = vp->v_rdev) == NULL) 1685 return (EBADF); /* device was revoked */ 1686 #if 0 1687 node = DEVFS_NODE(vp); 1688 1689 if (node) { 1690 nanotime(&node->atime); 1691 nanotime(&node->mtime); 1692 } 1693 #endif 1694 1695 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag, 1696 ap->a_cred, ap->a_sysmsg, NULL)); 1697 } 1698 1699 /* 1700 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn) 1701 */ 1702 /* ARGSUSED */ 1703 static int 1704 devfs_spec_kqfilter(struct vop_kqfilter_args *ap) 1705 { 1706 struct vnode *vp = ap->a_vp; 1707 #if 0 1708 struct devfs_node *node; 1709 #endif 1710 cdev_t dev; 1711 1712 if ((dev = vp->v_rdev) == NULL) 1713 return (EBADF); /* device was revoked (EBADF) */ 1714 #if 0 1715 node = DEVFS_NODE(vp); 1716 1717 if (node) 1718 nanotime(&node->atime); 1719 #endif 1720 1721 return (dev_dkqfilter(dev, ap->a_kn, NULL)); 1722 } 1723 1724 /* 1725 * Convert a vnode strategy call into a device strategy call. Vnode strategy 1726 * calls are not limited to device DMA limits so we have to deal with the 1727 * case. 1728 * 1729 * spec_strategy(struct vnode *a_vp, struct bio *a_bio) 1730 */ 1731 static int 1732 devfs_spec_strategy(struct vop_strategy_args *ap) 1733 { 1734 struct bio *bio = ap->a_bio; 1735 struct buf *bp = bio->bio_buf; 1736 struct buf *nbp; 1737 struct vnode *vp; 1738 struct mount *mp; 1739 int chunksize; 1740 int maxiosize; 1741 1742 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL) 1743 buf_start(bp); 1744 1745 /* 1746 * Collect statistics on synchronous and asynchronous read 1747 * and write counts for disks that have associated filesystems. 1748 */ 1749 vp = ap->a_vp; 1750 KKASSERT(vp->v_rdev != NULL); /* XXX */ 1751 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) { 1752 if (bp->b_cmd == BUF_CMD_READ) { 1753 if (bp->b_flags & BIO_SYNC) 1754 mp->mnt_stat.f_syncreads++; 1755 else 1756 mp->mnt_stat.f_asyncreads++; 1757 } else { 1758 if (bp->b_flags & BIO_SYNC) 1759 mp->mnt_stat.f_syncwrites++; 1760 else 1761 mp->mnt_stat.f_asyncwrites++; 1762 } 1763 } 1764 1765 /* 1766 * Device iosize limitations only apply to read and write. Shortcut 1767 * the I/O if it fits. 1768 */ 1769 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) { 1770 devfs_debug(DEVFS_DEBUG_DEBUG, 1771 "%s: si_iosize_max not set!\n", 1772 dev_dname(vp->v_rdev)); 1773 maxiosize = MAXPHYS; 1774 } 1775 #if SPEC_CHAIN_DEBUG & 2 1776 maxiosize = 4096; 1777 #endif 1778 if (bp->b_bcount <= maxiosize || 1779 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) { 1780 dev_dstrategy_chain(vp->v_rdev, bio); 1781 return (0); 1782 } 1783 1784 /* 1785 * Clone the buffer and set up an I/O chain to chunk up the I/O. 1786 */ 1787 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO); 1788 initbufbio(nbp); 1789 buf_dep_init(nbp); 1790 BUF_LOCK(nbp, LK_EXCLUSIVE); 1791 BUF_KERNPROC(nbp); 1792 nbp->b_vp = vp; 1793 nbp->b_flags = B_PAGING | B_KVABIO | (bp->b_flags & B_BNOCLIP); 1794 nbp->b_cpumask = bp->b_cpumask; 1795 nbp->b_data = bp->b_data; 1796 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1797 nbp->b_bio1.bio_offset = bio->bio_offset; 1798 nbp->b_bio1.bio_caller_info1.ptr = bio; 1799 1800 /* 1801 * Start the first transfer 1802 */ 1803 if (vn_isdisk(vp, NULL)) 1804 chunksize = vp->v_rdev->si_bsize_phys; 1805 else 1806 chunksize = DEV_BSIZE; 1807 chunksize = maxiosize / chunksize * chunksize; 1808 #if SPEC_CHAIN_DEBUG & 1 1809 devfs_debug(DEVFS_DEBUG_DEBUG, 1810 "spec_strategy chained I/O chunksize=%d\n", 1811 chunksize); 1812 #endif 1813 nbp->b_cmd = bp->b_cmd; 1814 nbp->b_bcount = chunksize; 1815 nbp->b_bufsize = chunksize; /* used to detect a short I/O */ 1816 nbp->b_bio1.bio_caller_info2.index = chunksize; 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, 0, bp->b_bcount, nbp->b_bcount); 1822 #endif 1823 1824 dev_dstrategy(vp->v_rdev, &nbp->b_bio1); 1825 1826 if (DEVFS_NODE(vp)) { 1827 nanotime(&DEVFS_NODE(vp)->atime); 1828 nanotime(&DEVFS_NODE(vp)->mtime); 1829 } 1830 1831 return (0); 1832 } 1833 1834 /* 1835 * Chunked up transfer completion routine - chain transfers until done 1836 * 1837 * NOTE: MPSAFE callback. 1838 */ 1839 static 1840 void 1841 devfs_spec_strategy_done(struct bio *nbio) 1842 { 1843 struct buf *nbp = nbio->bio_buf; 1844 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */ 1845 struct buf *bp = bio->bio_buf; /* original bp */ 1846 int chunksize = nbio->bio_caller_info2.index; /* chunking */ 1847 int boffset = nbp->b_data - bp->b_data; 1848 1849 if (nbp->b_flags & B_ERROR) { 1850 /* 1851 * An error terminates the chain, propogate the error back 1852 * to the original bp 1853 */ 1854 bp->b_flags |= B_ERROR; 1855 bp->b_error = nbp->b_error; 1856 bp->b_resid = bp->b_bcount - boffset + 1857 (nbp->b_bcount - nbp->b_resid); 1858 #if SPEC_CHAIN_DEBUG & 1 1859 devfs_debug(DEVFS_DEBUG_DEBUG, 1860 "spec_strategy: chain %p error %d bcount %d/%d\n", 1861 bp, bp->b_error, bp->b_bcount, 1862 bp->b_bcount - bp->b_resid); 1863 #endif 1864 } else if (nbp->b_resid) { 1865 /* 1866 * A short read or write terminates the chain 1867 */ 1868 bp->b_error = nbp->b_error; 1869 bp->b_resid = bp->b_bcount - boffset + 1870 (nbp->b_bcount - nbp->b_resid); 1871 #if SPEC_CHAIN_DEBUG & 1 1872 devfs_debug(DEVFS_DEBUG_DEBUG, 1873 "spec_strategy: chain %p short read(1) " 1874 "bcount %d/%d\n", 1875 bp, bp->b_bcount - bp->b_resid, bp->b_bcount); 1876 #endif 1877 } else if (nbp->b_bcount != nbp->b_bufsize) { 1878 /* 1879 * A short read or write can also occur by truncating b_bcount 1880 */ 1881 #if SPEC_CHAIN_DEBUG & 1 1882 devfs_debug(DEVFS_DEBUG_DEBUG, 1883 "spec_strategy: chain %p short read(2) " 1884 "bcount %d/%d\n", 1885 bp, nbp->b_bcount + boffset, bp->b_bcount); 1886 #endif 1887 bp->b_error = 0; 1888 bp->b_bcount = nbp->b_bcount + boffset; 1889 bp->b_resid = nbp->b_resid; 1890 } else if (nbp->b_bcount + boffset == bp->b_bcount) { 1891 /* 1892 * No more data terminates the chain 1893 */ 1894 #if SPEC_CHAIN_DEBUG & 1 1895 devfs_debug(DEVFS_DEBUG_DEBUG, 1896 "spec_strategy: chain %p finished bcount %d\n", 1897 bp, bp->b_bcount); 1898 #endif 1899 bp->b_error = 0; 1900 bp->b_resid = 0; 1901 } else { 1902 /* 1903 * Continue the chain 1904 */ 1905 boffset += nbp->b_bcount; 1906 nbp->b_data = bp->b_data + boffset; 1907 nbp->b_bcount = bp->b_bcount - boffset; 1908 if (nbp->b_bcount > chunksize) 1909 nbp->b_bcount = chunksize; 1910 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1911 nbp->b_bio1.bio_offset = bio->bio_offset + boffset; 1912 1913 #if SPEC_CHAIN_DEBUG & 1 1914 devfs_debug(DEVFS_DEBUG_DEBUG, 1915 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1916 bp, boffset, bp->b_bcount, nbp->b_bcount); 1917 #endif 1918 1919 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1); 1920 return; 1921 } 1922 1923 /* 1924 * Fall through to here on termination. biodone(bp) and 1925 * clean up and free nbp. 1926 */ 1927 biodone(bio); 1928 BUF_UNLOCK(nbp); 1929 uninitbufbio(nbp); 1930 kfree(nbp, M_DEVBUF); 1931 } 1932 1933 /* 1934 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length) 1935 */ 1936 static int 1937 devfs_spec_freeblks(struct vop_freeblks_args *ap) 1938 { 1939 struct buf *bp; 1940 1941 /* 1942 * Must be a synchronous operation 1943 */ 1944 KKASSERT(ap->a_vp->v_rdev != NULL); 1945 if ((ap->a_vp->v_rdev->si_flags & SI_CANFREE) == 0) 1946 return (0); 1947 bp = getpbuf(NULL); 1948 bp->b_cmd = BUF_CMD_FREEBLKS; 1949 bp->b_bio1.bio_flags |= BIO_SYNC; 1950 bp->b_bio1.bio_offset = ap->a_offset; 1951 bp->b_bio1.bio_done = biodone_sync; 1952 bp->b_bcount = ap->a_length; 1953 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1); 1954 biowait(&bp->b_bio1, "TRIM"); 1955 relpbuf(bp, NULL); 1956 1957 return (0); 1958 } 1959 1960 /* 1961 * Implement degenerate case where the block requested is the block 1962 * returned, and assume that the entire device is contiguous in regards 1963 * to the contiguous block range (runp and runb). 1964 * 1965 * spec_bmap(struct vnode *a_vp, off_t a_loffset, 1966 * off_t *a_doffsetp, int *a_runp, int *a_runb) 1967 */ 1968 static int 1969 devfs_spec_bmap(struct vop_bmap_args *ap) 1970 { 1971 if (ap->a_doffsetp != NULL) 1972 *ap->a_doffsetp = ap->a_loffset; 1973 if (ap->a_runp != NULL) 1974 *ap->a_runp = MAXBSIZE; 1975 if (ap->a_runb != NULL) { 1976 if (ap->a_loffset < MAXBSIZE) 1977 *ap->a_runb = (int)ap->a_loffset; 1978 else 1979 *ap->a_runb = MAXBSIZE; 1980 } 1981 return (0); 1982 } 1983 1984 1985 /* 1986 * Special device advisory byte-level locks. 1987 * 1988 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, 1989 * struct flock *a_fl, int a_flags) 1990 */ 1991 /* ARGSUSED */ 1992 static int 1993 devfs_spec_advlock(struct vop_advlock_args *ap) 1994 { 1995 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP); 1996 } 1997 1998 /* 1999 * NOTE: MPSAFE callback. 2000 */ 2001 static void 2002 devfs_spec_getpages_iodone(struct bio *bio) 2003 { 2004 bio->bio_buf->b_cmd = BUF_CMD_DONE; 2005 wakeup(bio->bio_buf); 2006 } 2007 2008 /* 2009 * spec_getpages() - get pages associated with device vnode. 2010 * 2011 * Note that spec_read and spec_write do not use the buffer cache, so we 2012 * must fully implement getpages here. 2013 */ 2014 static int 2015 devfs_spec_getpages(struct vop_getpages_args *ap) 2016 { 2017 vm_offset_t kva; 2018 int error; 2019 int i, pcount, size; 2020 struct buf *bp; 2021 vm_page_t m; 2022 vm_ooffset_t offset; 2023 int toff, nextoff, nread; 2024 struct vnode *vp = ap->a_vp; 2025 int blksiz; 2026 int gotreqpage; 2027 2028 error = 0; 2029 pcount = round_page(ap->a_count) / PAGE_SIZE; 2030 2031 /* 2032 * Calculate the offset of the transfer and do sanity check. 2033 */ 2034 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset; 2035 2036 /* 2037 * Round up physical size for real devices. We cannot round using 2038 * v_mount's block size data because v_mount has nothing to do with 2039 * the device. i.e. it's usually '/dev'. We need the physical block 2040 * size for the device itself. 2041 * 2042 * We can't use v_rdev->si_mountpoint because it only exists when the 2043 * block device is mounted. However, we can use v_rdev. 2044 */ 2045 if (vn_isdisk(vp, NULL)) 2046 blksiz = vp->v_rdev->si_bsize_phys; 2047 else 2048 blksiz = DEV_BSIZE; 2049 2050 size = roundup2(ap->a_count, blksiz); 2051 2052 bp = getpbuf_kva(NULL); 2053 kva = (vm_offset_t)bp->b_data; 2054 2055 /* 2056 * Map the pages to be read into the kva. 2057 */ 2058 pmap_qenter_noinval(kva, ap->a_m, pcount); 2059 2060 /* Build a minimal buffer header. */ 2061 bp->b_cmd = BUF_CMD_READ; 2062 bp->b_flags |= B_KVABIO; 2063 bp->b_bcount = size; 2064 bp->b_resid = 0; 2065 bsetrunningbufspace(bp, size); 2066 2067 bp->b_bio1.bio_offset = offset; 2068 bp->b_bio1.bio_done = devfs_spec_getpages_iodone; 2069 2070 mycpu->gd_cnt.v_vnodein++; 2071 mycpu->gd_cnt.v_vnodepgsin += pcount; 2072 2073 /* Do the input. */ 2074 vn_strategy(ap->a_vp, &bp->b_bio1); 2075 2076 crit_enter(); 2077 2078 /* We definitely need to be at splbio here. */ 2079 while (bp->b_cmd != BUF_CMD_DONE) 2080 tsleep(bp, 0, "spread", 0); 2081 2082 crit_exit(); 2083 2084 if (bp->b_flags & B_ERROR) { 2085 if (bp->b_error) 2086 error = bp->b_error; 2087 else 2088 error = EIO; 2089 } 2090 2091 /* 2092 * If EOF is encountered we must zero-extend the result in order 2093 * to ensure that the page does not contain garabge. When no 2094 * error occurs, an early EOF is indicated if b_bcount got truncated. 2095 * b_resid is relative to b_bcount and should be 0, but some devices 2096 * might indicate an EOF with b_resid instead of truncating b_bcount. 2097 */ 2098 nread = bp->b_bcount - bp->b_resid; 2099 if (nread < ap->a_count) { 2100 bkvasync(bp); 2101 bzero((caddr_t)kva + nread, ap->a_count - nread); 2102 } 2103 pmap_qremove_noinval(kva, pcount); 2104 2105 gotreqpage = 0; 2106 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) { 2107 nextoff = toff + PAGE_SIZE; 2108 m = ap->a_m[i]; 2109 2110 /* 2111 * NOTE: vm_page_undirty/clear_dirty etc do not clear the 2112 * pmap modified bit. pmap modified bit should have 2113 * already been cleared. 2114 */ 2115 if (nextoff <= nread) { 2116 m->valid = VM_PAGE_BITS_ALL; 2117 vm_page_undirty(m); 2118 } else if (toff < nread) { 2119 /* 2120 * Since this is a VM request, we have to supply the 2121 * unaligned offset to allow vm_page_set_valid() 2122 * to zero sub-DEV_BSIZE'd portions of the page. 2123 */ 2124 vm_page_set_valid(m, 0, nread - toff); 2125 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff); 2126 } else { 2127 m->valid = 0; 2128 vm_page_undirty(m); 2129 } 2130 2131 if (i != ap->a_reqpage) { 2132 /* 2133 * Just in case someone was asking for this page we 2134 * now tell them that it is ok to use. 2135 */ 2136 if (!error || (m->valid == VM_PAGE_BITS_ALL)) { 2137 if (m->valid) { 2138 if (m->flags & PG_REFERENCED) { 2139 vm_page_activate(m); 2140 } else { 2141 vm_page_deactivate(m); 2142 } 2143 vm_page_wakeup(m); 2144 } else { 2145 vm_page_free(m); 2146 } 2147 } else { 2148 vm_page_free(m); 2149 } 2150 } else if (m->valid) { 2151 gotreqpage = 1; 2152 /* 2153 * Since this is a VM request, we need to make the 2154 * entire page presentable by zeroing invalid sections. 2155 */ 2156 if (m->valid != VM_PAGE_BITS_ALL) 2157 vm_page_zero_invalid(m, FALSE); 2158 } 2159 } 2160 if (!gotreqpage) { 2161 m = ap->a_m[ap->a_reqpage]; 2162 devfs_debug(DEVFS_DEBUG_WARNING, 2163 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n", 2164 devtoname(vp->v_rdev), error, bp, bp->b_vp); 2165 devfs_debug(DEVFS_DEBUG_WARNING, 2166 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n", 2167 size, bp->b_resid, ap->a_count, m->valid); 2168 devfs_debug(DEVFS_DEBUG_WARNING, 2169 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n", 2170 nread, ap->a_reqpage, (u_long)m->pindex, pcount); 2171 /* 2172 * Free the buffer header back to the swap buffer pool. 2173 */ 2174 relpbuf(bp, NULL); 2175 return VM_PAGER_ERROR; 2176 } 2177 /* 2178 * Free the buffer header back to the swap buffer pool. 2179 */ 2180 relpbuf(bp, NULL); 2181 if (DEVFS_NODE(ap->a_vp)) 2182 nanotime(&DEVFS_NODE(ap->a_vp)->mtime); 2183 return VM_PAGER_OK; 2184 } 2185 2186 static __inline 2187 int 2188 sequential_heuristic(struct uio *uio, struct file *fp) 2189 { 2190 /* 2191 * Sequential heuristic - detect sequential operation 2192 */ 2193 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || 2194 uio->uio_offset == fp->f_nextoff) { 2195 /* 2196 * XXX we assume that the filesystem block size is 2197 * the default. Not true, but still gives us a pretty 2198 * good indicator of how sequential the read operations 2199 * are. 2200 */ 2201 int tmpseq = fp->f_seqcount; 2202 2203 tmpseq += (uio->uio_resid + MAXBSIZE - 1) / MAXBSIZE; 2204 if (tmpseq > IO_SEQMAX) 2205 tmpseq = IO_SEQMAX; 2206 fp->f_seqcount = tmpseq; 2207 return(fp->f_seqcount << IO_SEQSHIFT); 2208 } 2209 2210 /* 2211 * Not sequential, quick draw-down of seqcount 2212 */ 2213 if (fp->f_seqcount > 1) 2214 fp->f_seqcount = 1; 2215 else 2216 fp->f_seqcount = 0; 2217 return(0); 2218 } 2219