ptyfs_vnops.c revision 1.41
1 /* $NetBSD: ptyfs_vnops.c,v 1.41 2013/03/18 19:35:38 plunky Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 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 the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 35 */ 36 37 /* 38 * Copyright (c) 1993 Jan-Simon Pendry 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Jan-Simon Pendry. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 72 */ 73 74 /* 75 * ptyfs vnode interface 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.41 2013/03/18 19:35:38 plunky Exp $"); 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/file.h> 86 #include <sys/filedesc.h> 87 #include <sys/proc.h> 88 #include <sys/vnode.h> 89 #include <sys/namei.h> 90 #include <sys/malloc.h> 91 #include <sys/mount.h> 92 #include <sys/select.h> 93 #include <sys/dirent.h> 94 #include <sys/resourcevar.h> 95 #include <sys/stat.h> 96 #include <sys/conf.h> 97 #include <sys/tty.h> 98 #include <sys/pty.h> 99 #include <sys/kauth.h> 100 101 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 102 103 #include <machine/reg.h> 104 105 #include <fs/ptyfs/ptyfs.h> 106 #include <miscfs/genfs/genfs.h> 107 #include <miscfs/specfs/specdev.h> 108 109 MALLOC_DECLARE(M_PTYFSTMP); 110 111 /* 112 * Vnode Operations. 113 * 114 */ 115 116 int ptyfs_lookup (void *); 117 #define ptyfs_create genfs_eopnotsupp 118 #define ptyfs_mknod genfs_eopnotsupp 119 int ptyfs_open (void *); 120 int ptyfs_close (void *); 121 int ptyfs_access (void *); 122 int ptyfs_getattr (void *); 123 int ptyfs_setattr (void *); 124 int ptyfs_read (void *); 125 int ptyfs_write (void *); 126 #define ptyfs_fcntl genfs_fcntl 127 int ptyfs_ioctl (void *); 128 int ptyfs_poll (void *); 129 int ptyfs_kqfilter (void *); 130 #define ptyfs_revoke genfs_revoke 131 #define ptyfs_mmap genfs_eopnotsupp 132 #define ptyfs_fsync genfs_nullop 133 #define ptyfs_seek genfs_nullop 134 #define ptyfs_remove genfs_eopnotsupp 135 #define ptyfs_link genfs_abortop 136 #define ptyfs_rename genfs_eopnotsupp 137 #define ptyfs_mkdir genfs_eopnotsupp 138 #define ptyfs_rmdir genfs_eopnotsupp 139 #define ptyfs_symlink genfs_abortop 140 int ptyfs_readdir (void *); 141 #define ptyfs_readlink genfs_eopnotsupp 142 #define ptyfs_abortop genfs_abortop 143 int ptyfs_reclaim (void *); 144 #define ptyfs_lock genfs_lock 145 #define ptyfs_unlock genfs_unlock 146 #define ptyfs_bmap genfs_badop 147 #define ptyfs_strategy genfs_badop 148 int ptyfs_print (void *); 149 int ptyfs_pathconf (void *); 150 #define ptyfs_islocked genfs_islocked 151 #define ptyfs_advlock genfs_einval 152 #define ptyfs_bwrite genfs_eopnotsupp 153 #define ptyfs_putpages genfs_null_putpages 154 155 static int ptyfs_update(struct vnode *, const struct timespec *, 156 const struct timespec *, int); 157 static int ptyfs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 158 struct lwp *); 159 static int ptyfs_chmod(struct vnode *, mode_t, kauth_cred_t, struct lwp *); 160 static int atoi(const char *, size_t); 161 162 /* 163 * ptyfs vnode operations. 164 */ 165 int (**ptyfs_vnodeop_p)(void *); 166 const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = { 167 { &vop_default_desc, vn_default_error }, 168 { &vop_lookup_desc, ptyfs_lookup }, /* lookup */ 169 { &vop_create_desc, ptyfs_create }, /* create */ 170 { &vop_mknod_desc, ptyfs_mknod }, /* mknod */ 171 { &vop_open_desc, ptyfs_open }, /* open */ 172 { &vop_close_desc, ptyfs_close }, /* close */ 173 { &vop_access_desc, ptyfs_access }, /* access */ 174 { &vop_getattr_desc, ptyfs_getattr }, /* getattr */ 175 { &vop_setattr_desc, ptyfs_setattr }, /* setattr */ 176 { &vop_read_desc, ptyfs_read }, /* read */ 177 { &vop_write_desc, ptyfs_write }, /* write */ 178 { &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */ 179 { &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */ 180 { &vop_poll_desc, ptyfs_poll }, /* poll */ 181 { &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */ 182 { &vop_revoke_desc, ptyfs_revoke }, /* revoke */ 183 { &vop_mmap_desc, ptyfs_mmap }, /* mmap */ 184 { &vop_fsync_desc, ptyfs_fsync }, /* fsync */ 185 { &vop_seek_desc, ptyfs_seek }, /* seek */ 186 { &vop_remove_desc, ptyfs_remove }, /* remove */ 187 { &vop_link_desc, ptyfs_link }, /* link */ 188 { &vop_rename_desc, ptyfs_rename }, /* rename */ 189 { &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */ 190 { &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */ 191 { &vop_symlink_desc, ptyfs_symlink }, /* symlink */ 192 { &vop_readdir_desc, ptyfs_readdir }, /* readdir */ 193 { &vop_readlink_desc, ptyfs_readlink }, /* readlink */ 194 { &vop_abortop_desc, ptyfs_abortop }, /* abortop */ 195 { &vop_inactive_desc, spec_inactive }, /* inactive */ 196 { &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */ 197 { &vop_lock_desc, ptyfs_lock }, /* lock */ 198 { &vop_unlock_desc, ptyfs_unlock }, /* unlock */ 199 { &vop_bmap_desc, ptyfs_bmap }, /* bmap */ 200 { &vop_strategy_desc, ptyfs_strategy }, /* strategy */ 201 { &vop_print_desc, ptyfs_print }, /* print */ 202 { &vop_islocked_desc, ptyfs_islocked }, /* islocked */ 203 { &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */ 204 { &vop_advlock_desc, ptyfs_advlock }, /* advlock */ 205 { &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */ 206 { &vop_putpages_desc, ptyfs_putpages }, /* putpages */ 207 { NULL, NULL } 208 }; 209 const struct vnodeopv_desc ptyfs_vnodeop_opv_desc = 210 { &ptyfs_vnodeop_p, ptyfs_vnodeop_entries }; 211 212 /* 213 * _reclaim is called when getnewvnode() 214 * wants to make use of an entry on the vnode 215 * free list. at this time the filesystem needs 216 * to free any private data and remove the node 217 * from any private lists. 218 */ 219 int 220 ptyfs_reclaim(void *v) 221 { 222 struct vop_reclaim_args /* { 223 struct vnode *a_vp; 224 } */ *ap = v; 225 return ptyfs_freevp(ap->a_vp); 226 } 227 228 /* 229 * Return POSIX pathconf information applicable to special devices. 230 */ 231 int 232 ptyfs_pathconf(void *v) 233 { 234 struct vop_pathconf_args /* { 235 struct vnode *a_vp; 236 int a_name; 237 register_t *a_retval; 238 } */ *ap = v; 239 240 switch (ap->a_name) { 241 case _PC_LINK_MAX: 242 *ap->a_retval = LINK_MAX; 243 return 0; 244 case _PC_MAX_CANON: 245 *ap->a_retval = MAX_CANON; 246 return 0; 247 case _PC_MAX_INPUT: 248 *ap->a_retval = MAX_INPUT; 249 return 0; 250 case _PC_PIPE_BUF: 251 *ap->a_retval = PIPE_BUF; 252 return 0; 253 case _PC_CHOWN_RESTRICTED: 254 *ap->a_retval = 1; 255 return 0; 256 case _PC_VDISABLE: 257 *ap->a_retval = _POSIX_VDISABLE; 258 return 0; 259 case _PC_SYNC_IO: 260 *ap->a_retval = 1; 261 return 0; 262 default: 263 return EINVAL; 264 } 265 } 266 267 /* 268 * _print is used for debugging. 269 * just print a readable description 270 * of (vp). 271 */ 272 int 273 ptyfs_print(void *v) 274 { 275 struct vop_print_args /* { 276 struct vnode *a_vp; 277 } */ *ap = v; 278 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 279 280 printf("tag VT_PTYFS, type %d, pty %d\n", 281 ptyfs->ptyfs_type, ptyfs->ptyfs_pty); 282 return 0; 283 } 284 285 /* 286 * Invent attributes for ptyfsnode (vp) and store 287 * them in (vap). 288 * Directories lengths are returned as zero since 289 * any real length would require the genuine size 290 * to be computed, and nothing cares anyway. 291 * 292 * this is relatively minimal for ptyfs. 293 */ 294 int 295 ptyfs_getattr(void *v) 296 { 297 struct vop_getattr_args /* { 298 struct vnode *a_vp; 299 struct vattr *a_vap; 300 kauth_cred_t a_cred; 301 } */ *ap = v; 302 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 303 struct vattr *vap = ap->a_vap; 304 305 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 306 307 /* start by zeroing out the attributes */ 308 vattr_null(vap); 309 310 /* next do all the common fields */ 311 vap->va_type = ap->a_vp->v_type; 312 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 313 vap->va_fileid = ptyfs->ptyfs_fileno; 314 vap->va_gen = 0; 315 vap->va_flags = 0; 316 vap->va_nlink = 1; 317 vap->va_blocksize = PAGE_SIZE; 318 319 vap->va_atime = ptyfs->ptyfs_atime; 320 vap->va_mtime = ptyfs->ptyfs_mtime; 321 vap->va_ctime = ptyfs->ptyfs_ctime; 322 vap->va_birthtime = ptyfs->ptyfs_birthtime; 323 vap->va_mode = ptyfs->ptyfs_mode; 324 vap->va_flags = ptyfs->ptyfs_flags; 325 vap->va_uid = ptyfs->ptyfs_uid; 326 vap->va_gid = ptyfs->ptyfs_gid; 327 328 switch (ptyfs->ptyfs_type) { 329 case PTYFSpts: 330 case PTYFSptc: 331 if (pty_isfree(ptyfs->ptyfs_pty, 1)) 332 return ENOENT; 333 vap->va_bytes = vap->va_size = 0; 334 vap->va_rdev = ap->a_vp->v_rdev; 335 break; 336 case PTYFSroot: 337 vap->va_rdev = 0; 338 vap->va_bytes = vap->va_size = DEV_BSIZE; 339 break; 340 341 default: 342 return EOPNOTSUPP; 343 } 344 345 return 0; 346 } 347 348 /*ARGSUSED*/ 349 int 350 ptyfs_setattr(void *v) 351 { 352 struct vop_setattr_args /* { 353 struct vnodeop_desc *a_desc; 354 struct vnode *a_vp; 355 struct vattr *a_vap; 356 kauth_cred_t a_cred; 357 } */ *ap = v; 358 struct vnode *vp = ap->a_vp; 359 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 360 struct vattr *vap = ap->a_vap; 361 kauth_cred_t cred = ap->a_cred; 362 struct lwp *l = curlwp; 363 int error; 364 kauth_action_t action = KAUTH_VNODE_WRITE_FLAGS; 365 bool changing_sysflags = false; 366 367 if (vap->va_size != VNOVAL) { 368 switch (ptyfs->ptyfs_type) { 369 case PTYFSroot: 370 return EISDIR; 371 case PTYFSpts: 372 case PTYFSptc: 373 break; 374 default: 375 return EINVAL; 376 } 377 } 378 379 if (vap->va_flags != VNOVAL) { 380 if (vp->v_mount->mnt_flag & MNT_RDONLY) 381 return EROFS; 382 383 /* Immutable and append-only flags are not supported on ptyfs. */ 384 if (vap->va_flags & (IMMUTABLE | APPEND)) 385 return EINVAL; 386 387 /* Snapshot flag cannot be set or cleared */ 388 if ((vap->va_flags & SF_SNAPSHOT) != (ptyfs->ptyfs_flags & SF_SNAPSHOT)) 389 return EPERM; 390 391 if ((ptyfs->ptyfs_flags & SF_SETTABLE) != (vap->va_flags & SF_SETTABLE)) { 392 changing_sysflags = true; 393 action |= KAUTH_VNODE_WRITE_SYSFLAGS; 394 } 395 396 error = kauth_authorize_vnode(cred, action, vp, NULL, 397 genfs_can_chflags(cred, vp->v_type, ptyfs->ptyfs_uid, 398 changing_sysflags)); 399 if (error) 400 return error; 401 402 if (changing_sysflags) { 403 ptyfs->ptyfs_flags = vap->va_flags; 404 } else { 405 ptyfs->ptyfs_flags &= SF_SETTABLE; 406 ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); 407 } 408 ptyfs->ptyfs_status |= PTYFS_CHANGE; 409 } 410 411 /* 412 * Go through the fields and update iff not VNOVAL. 413 */ 414 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 415 if (vp->v_mount->mnt_flag & MNT_RDONLY) 416 return EROFS; 417 if (ptyfs->ptyfs_type == PTYFSroot) 418 return EPERM; 419 error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 420 if (error) 421 return error; 422 } 423 424 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || 425 vap->va_birthtime.tv_sec != VNOVAL) { 426 if (vp->v_mount->mnt_flag & MNT_RDONLY) 427 return EROFS; 428 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) 429 return EPERM; 430 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, 431 NULL, genfs_can_chtimes(vp, vap->va_vaflags, 432 ptyfs->ptyfs_uid, cred)); 433 if (error) 434 return (error); 435 if (vap->va_atime.tv_sec != VNOVAL) 436 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 437 ptyfs->ptyfs_status |= PTYFS_ACCESS; 438 if (vap->va_mtime.tv_sec != VNOVAL) { 439 ptyfs->ptyfs_status |= PTYFS_CHANGE | PTYFS_MODIFY; 440 if (vp->v_mount->mnt_flag & MNT_RELATIME) 441 ptyfs->ptyfs_status |= PTYFS_ACCESS; 442 } 443 if (vap->va_birthtime.tv_sec != VNOVAL) 444 ptyfs->ptyfs_birthtime = vap->va_birthtime; 445 ptyfs->ptyfs_status |= PTYFS_CHANGE; 446 error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); 447 if (error) 448 return error; 449 } 450 if (vap->va_mode != (mode_t)VNOVAL) { 451 if (vp->v_mount->mnt_flag & MNT_RDONLY) 452 return EROFS; 453 if (ptyfs->ptyfs_type == PTYFSroot) 454 return EPERM; 455 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 456 (vap->va_mode & 457 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 458 return EPERM; 459 error = ptyfs_chmod(vp, vap->va_mode, cred, l); 460 if (error) 461 return error; 462 } 463 VN_KNOTE(vp, NOTE_ATTRIB); 464 return 0; 465 } 466 467 /* 468 * Change the mode on a file. 469 * Inode must be locked before calling. 470 */ 471 static int 472 ptyfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) 473 { 474 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 475 int error; 476 477 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, vp, 478 NULL, genfs_can_chmod(vp->v_type, cred, ptyfs->ptyfs_uid, 479 ptyfs->ptyfs_gid, mode)); 480 if (error) 481 return (error); 482 483 ptyfs->ptyfs_mode &= ~ALLPERMS; 484 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 485 return 0; 486 } 487 488 /* 489 * Perform chown operation on inode ip; 490 * inode must be locked prior to call. 491 */ 492 static int 493 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 494 struct lwp *l) 495 { 496 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 497 int error; 498 499 if (uid == (uid_t)VNOVAL) 500 uid = ptyfs->ptyfs_uid; 501 if (gid == (gid_t)VNOVAL) 502 gid = ptyfs->ptyfs_gid; 503 504 error = kauth_authorize_vnode(cred, KAUTH_VNODE_CHANGE_OWNERSHIP, vp, 505 NULL, genfs_can_chown(cred, ptyfs->ptyfs_uid, ptyfs->ptyfs_gid, 506 uid, gid)); 507 if (error) 508 return (error); 509 510 ptyfs->ptyfs_gid = gid; 511 ptyfs->ptyfs_uid = uid; 512 return 0; 513 } 514 515 /* 516 * implement access checking. 517 * 518 * actually, the check for super-user is slightly 519 * broken since it will allow read access to write-only 520 * objects. this doesn't cause any particular trouble 521 * but does mean that the i/o entry points need to check 522 * that the operation really does make sense. 523 */ 524 int 525 ptyfs_access(void *v) 526 { 527 struct vop_access_args /* { 528 struct vnode *a_vp; 529 int a_mode; 530 kauth_cred_t a_cred; 531 } */ *ap = v; 532 struct vattr va; 533 int error; 534 535 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred)) != 0) 536 return error; 537 538 return kauth_authorize_vnode(ap->a_cred, 539 KAUTH_ACCESS_ACTION(ap->a_mode, ap->a_vp->v_type, va.va_mode), 540 ap->a_vp, NULL, genfs_can_access(va.va_type, va.va_mode, va.va_uid, 541 va.va_gid, ap->a_mode, ap->a_cred)); 542 543 return error; 544 } 545 546 /* 547 * lookup. this is incredibly complicated in the 548 * general case, however for most pseudo-filesystems 549 * very little needs to be done. 550 * 551 * Locking isn't hard here, just poorly documented. 552 * 553 * If we're looking up ".", just vref the parent & return it. 554 * 555 * If we're looking up "..", unlock the parent, and lock "..". If everything 556 * went ok, try to re-lock the parent. We do this to prevent lock races. 557 * 558 * For anything else, get the needed node. 559 * 560 * We try to exit with the parent locked in error cases. 561 */ 562 int 563 ptyfs_lookup(void *v) 564 { 565 struct vop_lookup_args /* { 566 struct vnode * a_dvp; 567 struct vnode ** a_vpp; 568 struct componentname * a_cnp; 569 } */ *ap = v; 570 struct componentname *cnp = ap->a_cnp; 571 struct vnode **vpp = ap->a_vpp; 572 struct vnode *dvp = ap->a_dvp; 573 const char *pname = cnp->cn_nameptr; 574 struct ptyfsnode *ptyfs; 575 int pty, error; 576 577 *vpp = NULL; 578 579 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 580 return EROFS; 581 582 if (cnp->cn_namelen == 1 && *pname == '.') { 583 *vpp = dvp; 584 vref(dvp); 585 return 0; 586 } 587 588 ptyfs = VTOPTYFS(dvp); 589 switch (ptyfs->ptyfs_type) { 590 case PTYFSroot: 591 /* 592 * Shouldn't get here with .. in the root node. 593 */ 594 if (cnp->cn_flags & ISDOTDOT) 595 return EIO; 596 597 pty = atoi(pname, cnp->cn_namelen); 598 599 if (pty < 0 || pty >= npty || pty_isfree(pty, 1)) 600 break; 601 602 error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty, 603 curlwp); 604 return error; 605 606 default: 607 return ENOTDIR; 608 } 609 610 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 611 } 612 613 /* 614 * readdir returns directory entries from ptyfsnode (vp). 615 * 616 * the strategy here with ptyfs is to generate a single 617 * directory entry at a time (struct dirent) and then 618 * copy that out to userland using uiomove. a more efficent 619 * though more complex implementation, would try to minimize 620 * the number of calls to uiomove(). for ptyfs, this is 621 * hardly worth the added code complexity. 622 * 623 * this should just be done through read() 624 */ 625 int 626 ptyfs_readdir(void *v) 627 { 628 struct vop_readdir_args /* { 629 struct vnode *a_vp; 630 struct uio *a_uio; 631 kauth_cred_t a_cred; 632 int *a_eofflag; 633 off_t **a_cookies; 634 int *a_ncookies; 635 } */ *ap = v; 636 struct uio *uio = ap->a_uio; 637 struct dirent *dp; 638 struct ptyfsnode *ptyfs; 639 off_t i; 640 int error; 641 off_t *cookies = NULL; 642 int ncookies; 643 struct vnode *vp; 644 int nc = 0; 645 646 vp = ap->a_vp; 647 ptyfs = VTOPTYFS(vp); 648 649 if (uio->uio_resid < UIO_MX) 650 return EINVAL; 651 if (uio->uio_offset < 0) 652 return EINVAL; 653 654 dp = malloc(sizeof(struct dirent), M_PTYFSTMP, M_WAITOK | M_ZERO); 655 656 error = 0; 657 i = uio->uio_offset; 658 dp->d_reclen = UIO_MX; 659 ncookies = uio->uio_resid / UIO_MX; 660 661 if (ptyfs->ptyfs_type != PTYFSroot) { 662 error = ENOTDIR; 663 goto out; 664 } 665 666 if (i >= npty) 667 goto out; 668 669 if (ap->a_ncookies) { 670 ncookies = min(ncookies, (npty + 2 - i)); 671 cookies = malloc(ncookies * sizeof (off_t), 672 M_TEMP, M_WAITOK); 673 *ap->a_cookies = cookies; 674 } 675 676 for (; i < 2; i++) { 677 /* `.' and/or `..' */ 678 dp->d_fileno = PTYFS_FILENO(0, PTYFSroot); 679 dp->d_namlen = i + 1; 680 (void)memcpy(dp->d_name, "..", dp->d_namlen); 681 dp->d_name[i + 1] = '\0'; 682 dp->d_type = DT_DIR; 683 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 684 goto out; 685 if (cookies) 686 *cookies++ = i + 1; 687 nc++; 688 } 689 for (; uio->uio_resid >= UIO_MX && i < npty; i++) { 690 /* check for used ptys */ 691 if (pty_isfree(i - 2, 1)) 692 continue; 693 694 dp->d_fileno = PTYFS_FILENO(i - 2, PTYFSpts); 695 dp->d_namlen = snprintf(dp->d_name, sizeof(dp->d_name), 696 "%lld", (long long)(i - 2)); 697 dp->d_type = DT_CHR; 698 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 699 goto out; 700 if (cookies) 701 *cookies++ = i + 1; 702 nc++; 703 } 704 705 out: 706 /* not pertinent in error cases */ 707 ncookies = nc; 708 709 if (ap->a_ncookies) { 710 if (error) { 711 if (cookies) 712 free(*ap->a_cookies, M_TEMP); 713 *ap->a_ncookies = 0; 714 *ap->a_cookies = NULL; 715 } else 716 *ap->a_ncookies = ncookies; 717 } 718 uio->uio_offset = i; 719 free(dp, M_PTYFSTMP); 720 return error; 721 } 722 723 int 724 ptyfs_open(void *v) 725 { 726 struct vop_open_args /* { 727 struct vnode *a_vp; 728 int a_mode; 729 kauth_cred_t a_cred; 730 } */ *ap = v; 731 struct vnode *vp = ap->a_vp; 732 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 733 734 switch (ptyfs->ptyfs_type) { 735 case PTYFSpts: 736 case PTYFSptc: 737 return spec_open(v); 738 case PTYFSroot: 739 return 0; 740 default: 741 return EINVAL; 742 } 743 } 744 745 int 746 ptyfs_close(void *v) 747 { 748 struct vop_close_args /* { 749 struct vnode *a_vp; 750 int a_fflag; 751 kauth_cred_t a_cred; 752 } */ *ap = v; 753 struct vnode *vp = ap->a_vp; 754 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 755 756 mutex_enter(vp->v_interlock); 757 if (vp->v_usecount > 1) 758 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 759 mutex_exit(vp->v_interlock); 760 761 switch (ptyfs->ptyfs_type) { 762 case PTYFSpts: 763 case PTYFSptc: 764 return spec_close(v); 765 case PTYFSroot: 766 return 0; 767 default: 768 return EINVAL; 769 } 770 } 771 772 int 773 ptyfs_read(void *v) 774 { 775 struct vop_read_args /* { 776 struct vnode *a_vp; 777 struct uio *a_uio; 778 int a_ioflag; 779 kauth_cred_t a_cred; 780 } */ *ap = v; 781 struct timespec ts; 782 struct vnode *vp = ap->a_vp; 783 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 784 int error; 785 786 if (vp->v_type == VDIR) 787 return EISDIR; 788 789 ptyfs->ptyfs_status |= PTYFS_ACCESS; 790 /* hardclock() resolution is good enough for ptyfs */ 791 getnanotime(&ts); 792 (void)ptyfs_update(vp, &ts, &ts, 0); 793 794 switch (ptyfs->ptyfs_type) { 795 case PTYFSpts: 796 case PTYFSptc: 797 VOP_UNLOCK(vp); 798 error = cdev_read(vp->v_rdev, ap->a_uio, ap->a_ioflag); 799 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 800 return error; 801 default: 802 return EOPNOTSUPP; 803 } 804 } 805 806 int 807 ptyfs_write(void *v) 808 { 809 struct vop_write_args /* { 810 struct vnode *a_vp; 811 struct uio *a_uio; 812 int a_ioflag; 813 kauth_cred_t a_cred; 814 } */ *ap = v; 815 struct timespec ts; 816 struct vnode *vp = ap->a_vp; 817 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 818 int error; 819 820 ptyfs->ptyfs_status |= PTYFS_MODIFY; 821 getnanotime(&ts); 822 (void)ptyfs_update(vp, &ts, &ts, 0); 823 824 switch (ptyfs->ptyfs_type) { 825 case PTYFSpts: 826 case PTYFSptc: 827 VOP_UNLOCK(vp); 828 error = cdev_write(vp->v_rdev, ap->a_uio, ap->a_ioflag); 829 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 830 return error; 831 default: 832 return EOPNOTSUPP; 833 } 834 } 835 836 int 837 ptyfs_ioctl(void *v) 838 { 839 struct vop_ioctl_args /* { 840 struct vnode *a_vp; 841 u_long a_command; 842 void *a_data; 843 int a_fflag; 844 kauth_cred_t a_cred; 845 } */ *ap = v; 846 struct vnode *vp = ap->a_vp; 847 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 848 849 switch (ptyfs->ptyfs_type) { 850 case PTYFSpts: 851 case PTYFSptc: 852 return cdev_ioctl(vp->v_rdev, ap->a_command, 853 ap->a_data, ap->a_fflag, curlwp); 854 default: 855 return EOPNOTSUPP; 856 } 857 } 858 859 int 860 ptyfs_poll(void *v) 861 { 862 struct vop_poll_args /* { 863 struct vnode *a_vp; 864 int a_events; 865 } */ *ap = v; 866 struct vnode *vp = ap->a_vp; 867 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 868 869 switch (ptyfs->ptyfs_type) { 870 case PTYFSpts: 871 case PTYFSptc: 872 return cdev_poll(vp->v_rdev, ap->a_events, curlwp); 873 default: 874 return genfs_poll(v); 875 } 876 } 877 878 int 879 ptyfs_kqfilter(void *v) 880 { 881 struct vop_kqfilter_args /* { 882 struct vnode *a_vp; 883 struct knote *a_kn; 884 } */ *ap = v; 885 struct vnode *vp = ap->a_vp; 886 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 887 888 switch (ptyfs->ptyfs_type) { 889 case PTYFSpts: 890 case PTYFSptc: 891 return cdev_kqfilter(vp->v_rdev, ap->a_kn); 892 default: 893 return genfs_kqfilter(v); 894 } 895 } 896 897 static int 898 ptyfs_update(struct vnode *vp, const struct timespec *acc, 899 const struct timespec *mod, int flags) 900 { 901 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 902 903 if (vp->v_mount->mnt_flag & MNT_RDONLY) 904 return 0; 905 906 PTYFS_ITIMES(ptyfs, acc, mod, NULL); 907 return 0; 908 } 909 910 void 911 ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, 912 const struct timespec *mod, const struct timespec *cre) 913 { 914 struct timespec now; 915 916 KASSERT(ptyfs->ptyfs_status & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); 917 918 getnanotime(&now); 919 if (ptyfs->ptyfs_status & PTYFS_ACCESS) { 920 if (acc == NULL) 921 acc = &now; 922 ptyfs->ptyfs_atime = *acc; 923 } 924 if (ptyfs->ptyfs_status & PTYFS_MODIFY) { 925 if (mod == NULL) 926 mod = &now; 927 ptyfs->ptyfs_mtime = *mod; 928 } 929 if (ptyfs->ptyfs_status & PTYFS_CHANGE) { 930 if (cre == NULL) 931 cre = &now; 932 ptyfs->ptyfs_ctime = *cre; 933 } 934 ptyfs->ptyfs_status &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); 935 } 936 937 /* 938 * convert decimal ascii to int 939 */ 940 static int 941 atoi(const char *b, size_t len) 942 { 943 int p = 0; 944 945 while (len--) { 946 char c = *b++; 947 if (c < '0' || c > '9') 948 return -1; 949 p = 10 * p + (c - '0'); 950 } 951 952 return p; 953 } 954
Indexes created Thu Sep 25 16:09:42 GMT 2025