ptyfs_vnops.c revision 1.7
1 /* $NetBSD: ptyfs_vnops.c,v 1.7 2005/02/26 22:58:55 perry 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 1.7 2005/02/26 22:58:55 perry 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> 99 100 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 101 102 #include <machine/reg.h> 103 104 #include <fs/ptyfs/ptyfs.h> 105 #include <miscfs/genfs/genfs.h> 106 #include <miscfs/specfs/specdev.h> 107 108 /* 109 * Vnode Operations. 110 * 111 */ 112 113 int ptyfs_lookup (void *); 114 #define ptyfs_create genfs_eopnotsupp 115 #define ptyfs_mknod genfs_eopnotsupp 116 int ptyfs_open (void *); 117 int ptyfs_close (void *); 118 int ptyfs_access (void *); 119 int ptyfs_getattr (void *); 120 int ptyfs_setattr (void *); 121 int ptyfs_read (void *); 122 int ptyfs_write (void *); 123 #define ptyfs_fcntl genfs_fcntl 124 int ptyfs_ioctl (void *); 125 int ptyfs_poll (void *); 126 int ptyfs_kqfilter (void *); 127 #define ptyfs_revoke genfs_revoke 128 #define ptyfs_mmap genfs_eopnotsupp 129 #define ptyfs_fsync genfs_nullop 130 #define ptyfs_seek genfs_nullop 131 #define ptyfs_remove genfs_eopnotsupp 132 #define ptyfs_link genfs_abortop 133 #define ptyfs_rename genfs_eopnotsupp 134 #define ptyfs_mkdir genfs_eopnotsupp 135 #define ptyfs_rmdir genfs_eopnotsupp 136 #define ptyfs_symlink genfs_abortop 137 int ptyfs_readdir (void *); 138 #define ptyfs_readlink genfs_eopnotsupp 139 #define ptyfs_abortop genfs_abortop 140 int ptyfs_reclaim (void *); 141 #define ptyfs_lock genfs_lock 142 #define ptyfs_unlock genfs_unlock 143 #define ptyfs_bmap genfs_badop 144 #define ptyfs_strategy genfs_badop 145 int ptyfs_print (void *); 146 int ptyfs_pathconf (void *); 147 #define ptyfs_islocked genfs_islocked 148 #define ptyfs_advlock genfs_einval 149 #define ptyfs_blkatoff genfs_eopnotsupp 150 #define ptyfs_valloc genfs_eopnotsupp 151 #define ptyfs_vfree genfs_nullop 152 #define ptyfs_truncate genfs_eopnotsupp 153 int ptyfs_update (void *); 154 #define ptyfs_bwrite genfs_eopnotsupp 155 #define ptyfs_putpages genfs_null_putpages 156 157 static int ptyfs_chown(struct vnode *, uid_t, gid_t, struct ucred *, 158 struct proc *); 159 static int ptyfs_chmod(struct vnode *, mode_t, struct ucred *, struct proc *); 160 static void ptyfs_time(struct ptyfsnode *, struct timespec *, 161 struct timespec *); 162 static int atoi(const char *, size_t); 163 164 extern const struct cdevsw pts_cdevsw, ptc_cdevsw; 165 166 /* 167 * ptyfs vnode operations. 168 */ 169 int (**ptyfs_vnodeop_p)(void *); 170 const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = { 171 { &vop_default_desc, vn_default_error }, 172 { &vop_lookup_desc, ptyfs_lookup }, /* lookup */ 173 { &vop_create_desc, ptyfs_create }, /* create */ 174 { &vop_mknod_desc, ptyfs_mknod }, /* mknod */ 175 { &vop_open_desc, ptyfs_open }, /* open */ 176 { &vop_close_desc, ptyfs_close }, /* close */ 177 { &vop_access_desc, ptyfs_access }, /* access */ 178 { &vop_getattr_desc, ptyfs_getattr }, /* getattr */ 179 { &vop_setattr_desc, ptyfs_setattr }, /* setattr */ 180 { &vop_read_desc, ptyfs_read }, /* read */ 181 { &vop_write_desc, ptyfs_write }, /* write */ 182 { &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */ 183 { &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */ 184 { &vop_poll_desc, ptyfs_poll }, /* poll */ 185 { &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */ 186 { &vop_revoke_desc, ptyfs_revoke }, /* revoke */ 187 { &vop_mmap_desc, ptyfs_mmap }, /* mmap */ 188 { &vop_fsync_desc, ptyfs_fsync }, /* fsync */ 189 { &vop_seek_desc, ptyfs_seek }, /* seek */ 190 { &vop_remove_desc, ptyfs_remove }, /* remove */ 191 { &vop_link_desc, ptyfs_link }, /* link */ 192 { &vop_rename_desc, ptyfs_rename }, /* rename */ 193 { &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */ 194 { &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */ 195 { &vop_symlink_desc, ptyfs_symlink }, /* symlink */ 196 { &vop_readdir_desc, ptyfs_readdir }, /* readdir */ 197 { &vop_readlink_desc, ptyfs_readlink }, /* readlink */ 198 { &vop_abortop_desc, ptyfs_abortop }, /* abortop */ 199 { &vop_inactive_desc, spec_inactive }, /* inactive */ 200 { &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */ 201 { &vop_lock_desc, ptyfs_lock }, /* lock */ 202 { &vop_unlock_desc, ptyfs_unlock }, /* unlock */ 203 { &vop_bmap_desc, ptyfs_bmap }, /* bmap */ 204 { &vop_strategy_desc, ptyfs_strategy }, /* strategy */ 205 { &vop_print_desc, ptyfs_print }, /* print */ 206 { &vop_islocked_desc, ptyfs_islocked }, /* islocked */ 207 { &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */ 208 { &vop_advlock_desc, ptyfs_advlock }, /* advlock */ 209 { &vop_blkatoff_desc, ptyfs_blkatoff }, /* blkatoff */ 210 { &vop_valloc_desc, ptyfs_valloc }, /* valloc */ 211 { &vop_vfree_desc, ptyfs_vfree }, /* vfree */ 212 { &vop_truncate_desc, ptyfs_truncate }, /* truncate */ 213 { &vop_update_desc, ptyfs_update }, /* update */ 214 { &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */ 215 { &vop_putpages_desc, ptyfs_putpages }, /* putpages */ 216 { NULL, NULL } 217 }; 218 const struct vnodeopv_desc ptyfs_vnodeop_opv_desc = 219 { &ptyfs_vnodeop_p, ptyfs_vnodeop_entries }; 220 221 /* 222 * _reclaim is called when getnewvnode() 223 * wants to make use of an entry on the vnode 224 * free list. at this time the filesystem needs 225 * to free any private data and remove the node 226 * from any private lists. 227 */ 228 int 229 ptyfs_reclaim(void *v) 230 { 231 struct vop_reclaim_args /* { 232 struct vnode *a_vp; 233 } */ *ap = v; 234 return ptyfs_freevp(ap->a_vp); 235 } 236 237 /* 238 * Return POSIX pathconf information applicable to special devices. 239 */ 240 int 241 ptyfs_pathconf(void *v) 242 { 243 struct vop_pathconf_args /* { 244 struct vnode *a_vp; 245 int a_name; 246 register_t *a_retval; 247 } */ *ap = v; 248 249 switch (ap->a_name) { 250 case _PC_LINK_MAX: 251 *ap->a_retval = LINK_MAX; 252 return 0; 253 case _PC_MAX_CANON: 254 *ap->a_retval = MAX_CANON; 255 return 0; 256 case _PC_MAX_INPUT: 257 *ap->a_retval = MAX_INPUT; 258 return 0; 259 case _PC_PIPE_BUF: 260 *ap->a_retval = PIPE_BUF; 261 return 0; 262 case _PC_CHOWN_RESTRICTED: 263 *ap->a_retval = 1; 264 return 0; 265 case _PC_VDISABLE: 266 *ap->a_retval = _POSIX_VDISABLE; 267 return 0; 268 case _PC_SYNC_IO: 269 *ap->a_retval = 1; 270 return 0; 271 default: 272 return EINVAL; 273 } 274 } 275 276 /* 277 * _print is used for debugging. 278 * just print a readable description 279 * of (vp). 280 */ 281 int 282 ptyfs_print(void *v) 283 { 284 struct vop_print_args /* { 285 struct vnode *a_vp; 286 } */ *ap = v; 287 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 288 289 printf("tag VT_PTYFS, type %d, pty %d\n", 290 ptyfs->ptyfs_type, ptyfs->ptyfs_pty); 291 return 0; 292 } 293 294 /* 295 * Invent attributes for ptyfsnode (vp) and store 296 * them in (vap). 297 * Directories lengths are returned as zero since 298 * any real length would require the genuine size 299 * to be computed, and nothing cares anyway. 300 * 301 * this is relatively minimal for ptyfs. 302 */ 303 int 304 ptyfs_getattr(void *v) 305 { 306 struct vop_getattr_args /* { 307 struct vnode *a_vp; 308 struct vattr *a_vap; 309 struct ucred *a_cred; 310 struct proc *a_p; 311 } */ *ap = v; 312 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 313 struct vattr *vap = ap->a_vap; 314 struct timespec ts; 315 316 TIMEVAL_TO_TIMESPEC(&time, &ts); 317 ptyfs_time(ptyfs, &ts, &ts); 318 319 /* start by zeroing out the attributes */ 320 VATTR_NULL(vap); 321 322 /* next do all the common fields */ 323 vap->va_type = ap->a_vp->v_type; 324 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 325 vap->va_fileid = ptyfs->ptyfs_fileno; 326 vap->va_gen = 0; 327 vap->va_flags = 0; 328 vap->va_nlink = 1; 329 vap->va_blocksize = PAGE_SIZE; 330 331 vap->va_atime = ptyfs->ptyfs_atime; 332 vap->va_mtime = ptyfs->ptyfs_mtime; 333 vap->va_ctime = ptyfs->ptyfs_ctime; 334 vap->va_birthtime = ptyfs->ptyfs_birthtime; 335 vap->va_mode = ptyfs->ptyfs_mode; 336 vap->va_flags = ptyfs->ptyfs_flags; 337 vap->va_uid = ptyfs->ptyfs_uid; 338 vap->va_gid = ptyfs->ptyfs_gid; 339 340 switch (ptyfs->ptyfs_type) { 341 case PTYFSpts: 342 case PTYFSptc: 343 if (pty_isfree(ptyfs->ptyfs_pty, 1)) 344 return ENOENT; 345 vap->va_bytes = vap->va_size = 0; 346 vap->va_rdev = ap->a_vp->v_rdev; 347 break; 348 case PTYFSroot: 349 vap->va_rdev = 0; 350 vap->va_bytes = vap->va_size = DEV_BSIZE; 351 break; 352 353 default: 354 return EOPNOTSUPP; 355 } 356 357 return 0; 358 } 359 360 /*ARGSUSED*/ 361 int 362 ptyfs_setattr(void *v) 363 { 364 struct vop_setattr_args /* { 365 struct vnodeop_desc *a_desc; 366 struct vnode *a_vp; 367 struct vattr *a_vap; 368 struct ucred *a_cred; 369 struct proc *a_p; 370 } */ *ap = v; 371 struct vnode *vp = ap->a_vp; 372 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 373 struct vattr *vap = ap->a_vap; 374 struct ucred *cred = ap->a_cred; 375 struct proc *p = ap->a_p; 376 int error; 377 378 if (vap->va_size != VNOVAL) { 379 switch (ptyfs->ptyfs_type) { 380 case PTYFSroot: 381 return EISDIR; 382 case PTYFSpts: 383 case PTYFSptc: 384 break; 385 default: 386 return EINVAL; 387 } 388 } 389 390 if (vap->va_flags != VNOVAL) { 391 if (vp->v_mount->mnt_flag & MNT_RDONLY) 392 return EROFS; 393 if (cred->cr_uid != ptyfs->ptyfs_uid && 394 (error = suser(cred, &p->p_acflag)) != 0) 395 return error; 396 if (cred->cr_uid == 0) { 397 if ((ptyfs->ptyfs_flags & (SF_IMMUTABLE | SF_APPEND)) && 398 securelevel > 0) 399 return EPERM; 400 /* Snapshot flag cannot be set or cleared */ 401 if ((vap->va_flags & SF_SNAPSHOT) != 402 (ptyfs->ptyfs_flags & SF_SNAPSHOT)) 403 return EPERM; 404 ptyfs->ptyfs_flags = vap->va_flags; 405 } else { 406 if ((ptyfs->ptyfs_flags & (SF_IMMUTABLE | SF_APPEND)) || 407 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 408 return EPERM; 409 if ((ptyfs->ptyfs_flags & SF_SETTABLE) != 410 (vap->va_flags & SF_SETTABLE)) 411 return EPERM; 412 ptyfs->ptyfs_flags &= SF_SETTABLE; 413 ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); 414 } 415 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 416 if (vap->va_flags & (IMMUTABLE | APPEND)) 417 return 0; 418 } 419 if (ptyfs->ptyfs_flags & (IMMUTABLE | APPEND)) 420 return EPERM; 421 /* 422 * Go through the fields and update iff not VNOVAL. 423 */ 424 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 425 if (vp->v_mount->mnt_flag & MNT_RDONLY) 426 return EROFS; 427 if (ptyfs->ptyfs_type == PTYFSroot) 428 return EPERM; 429 error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 430 if (error) 431 return error; 432 } 433 434 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || 435 vap->va_birthtime.tv_sec != VNOVAL) { 436 if (vp->v_mount->mnt_flag & MNT_RDONLY) 437 return EROFS; 438 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) 439 return EPERM; 440 if (cred->cr_uid != ptyfs->ptyfs_uid && 441 (error = suser(cred, &p->p_acflag)) && 442 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 443 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)) 444 return (error); 445 if (vap->va_atime.tv_sec != VNOVAL) 446 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 447 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 448 if (vap->va_mtime.tv_sec != VNOVAL) 449 ptyfs->ptyfs_flag |= PTYFS_CHANGE | PTYFS_MODIFY; 450 if (vap->va_birthtime.tv_sec != VNOVAL) 451 ptyfs->ptyfs_birthtime = vap->va_birthtime; 452 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 453 error = VOP_UPDATE(vp, &vap->va_atime, &vap->va_mtime, 0); 454 if (error) 455 return error; 456 } 457 if (vap->va_mode != (mode_t)VNOVAL) { 458 if (vp->v_mount->mnt_flag & MNT_RDONLY) 459 return EROFS; 460 if (ptyfs->ptyfs_type == PTYFSroot) 461 return EPERM; 462 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 463 (vap->va_mode & 464 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 465 return EPERM; 466 error = ptyfs_chmod(vp, vap->va_mode, cred, p); 467 if (error) 468 return error; 469 } 470 VN_KNOTE(vp, NOTE_ATTRIB); 471 return 0; 472 } 473 474 /* 475 * Change the mode on a file. 476 * Inode must be locked before calling. 477 */ 478 static int 479 ptyfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct proc *p) 480 { 481 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 482 int error; 483 484 if (cred->cr_uid != ptyfs->ptyfs_uid && 485 (error = suser(cred, &p->p_acflag)) != 0) 486 return error; 487 ptyfs->ptyfs_mode &= ~ALLPERMS; 488 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 489 return 0; 490 } 491 492 /* 493 * Perform chown operation on inode ip; 494 * inode must be locked prior to call. 495 */ 496 static int 497 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 498 struct proc *p) 499 { 500 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 501 int error; 502 503 if (uid == (uid_t)VNOVAL) 504 uid = ptyfs->ptyfs_uid; 505 if (gid == (gid_t)VNOVAL) 506 gid = ptyfs->ptyfs_gid; 507 /* 508 * If we don't own the file, are trying to change the owner 509 * of the file, or are not a member of the target group, 510 * the caller's credentials must imply super-user privilege 511 * or the call fails. 512 */ 513 if ((cred->cr_uid != ptyfs->ptyfs_uid || uid != ptyfs->ptyfs_uid || 514 (gid != ptyfs->ptyfs_gid && 515 !(cred->cr_gid == gid || groupmember((gid_t)gid, cred)))) && 516 ((error = suser(cred, &p->p_acflag)) != 0)) 517 return error; 518 519 ptyfs->ptyfs_gid = gid; 520 ptyfs->ptyfs_uid = uid; 521 return 0; 522 } 523 524 /* 525 * implement access checking. 526 * 527 * actually, the check for super-user is slightly 528 * broken since it will allow read access to write-only 529 * objects. this doesn't cause any particular trouble 530 * but does mean that the i/o entry points need to check 531 * that the operation really does make sense. 532 */ 533 int 534 ptyfs_access(void *v) 535 { 536 struct vop_access_args /* { 537 struct vnode *a_vp; 538 int a_mode; 539 struct ucred *a_cred; 540 struct proc *a_p; 541 } */ *ap = v; 542 struct vattr va; 543 int error; 544 545 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred, ap->a_p)) != 0) 546 return error; 547 548 return vaccess(va.va_type, va.va_mode, 549 va.va_uid, va.va_gid, ap->a_mode, ap->a_cred); 550 } 551 552 /* 553 * lookup. this is incredibly complicated in the 554 * general case, however for most pseudo-filesystems 555 * very little needs to be done. 556 * 557 * Locking isn't hard here, just poorly documented. 558 * 559 * If we're looking up ".", just vref the parent & return it. 560 * 561 * If we're looking up "..", unlock the parent, and lock "..". If everything 562 * went ok, and we're on the last component and the caller requested the 563 * parent locked, try to re-lock the parent. We do this to prevent lock 564 * races. 565 * 566 * For anything else, get the needed node. Then unlock the parent if not 567 * the last component or not LOCKPARENT (i.e. if we wouldn't re-lock the 568 * parent in the .. case). 569 * 570 * We try to exit with the parent locked in error cases. 571 */ 572 int 573 ptyfs_lookup(void *v) 574 { 575 struct vop_lookup_args /* { 576 struct vnode * a_dvp; 577 struct vnode ** a_vpp; 578 struct componentname * a_cnp; 579 } */ *ap = v; 580 struct componentname *cnp = ap->a_cnp; 581 struct vnode **vpp = ap->a_vpp; 582 struct vnode *dvp = ap->a_dvp; 583 const char *pname = cnp->cn_nameptr; 584 struct ptyfsnode *ptyfs; 585 int pty, error, wantpunlock; 586 587 *vpp = NULL; 588 cnp->cn_flags &= ~PDIRUNLOCK; 589 590 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 591 return EROFS; 592 593 if (cnp->cn_namelen == 1 && *pname == '.') { 594 *vpp = dvp; 595 VREF(dvp); 596 return 0; 597 } 598 599 wantpunlock = ~cnp->cn_flags & (LOCKPARENT | ISLASTCN); 600 ptyfs = VTOPTYFS(dvp); 601 switch (ptyfs->ptyfs_type) { 602 case PTYFSroot: 603 /* 604 * Shouldn't get here with .. in the root node. 605 */ 606 if (cnp->cn_flags & ISDOTDOT) 607 return EIO; 608 609 pty = atoi(pname, cnp->cn_namelen); 610 611 if (pty < 0 || pty >= npty || pty_isfree(pty, 1)) 612 break; 613 614 error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty, 615 curproc); 616 if (error == 0 && wantpunlock) { 617 VOP_UNLOCK(dvp, 0); 618 cnp->cn_flags |= PDIRUNLOCK; 619 } 620 return error; 621 622 default: 623 return ENOTDIR; 624 } 625 626 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 627 } 628 629 /* 630 * readdir returns directory entries from ptyfsnode (vp). 631 * 632 * the strategy here with ptyfs is to generate a single 633 * directory entry at a time (struct dirent) and then 634 * copy that out to userland using uiomove. a more efficent 635 * though more complex implementation, would try to minimize 636 * the number of calls to uiomove(). for ptyfs, this is 637 * hardly worth the added code complexity. 638 * 639 * this should just be done through read() 640 */ 641 int 642 ptyfs_readdir(void *v) 643 { 644 struct vop_readdir_args /* { 645 struct vnode *a_vp; 646 struct uio *a_uio; 647 struct ucred *a_cred; 648 int *a_eofflag; 649 off_t **a_cookies; 650 int *a_ncookies; 651 } */ *ap = v; 652 struct uio *uio = ap->a_uio; 653 struct dirent d; 654 struct ptyfsnode *ptyfs; 655 off_t i; 656 int error; 657 off_t *cookies = NULL; 658 int ncookies; 659 struct vnode *vp; 660 int nc = 0; 661 662 vp = ap->a_vp; 663 ptyfs = VTOPTYFS(vp); 664 665 if (uio->uio_resid < UIO_MX) 666 return EINVAL; 667 if (uio->uio_offset < 0) 668 return EINVAL; 669 670 error = 0; 671 i = uio->uio_offset; 672 (void)memset(&d, 0, sizeof(d)); 673 d.d_reclen = UIO_MX; 674 ncookies = uio->uio_resid / UIO_MX; 675 676 switch (ptyfs->ptyfs_type) { 677 case PTYFSroot: /* root */ 678 679 if (i >= npty) 680 return 0; 681 682 if (ap->a_ncookies) { 683 ncookies = min(ncookies, (npty + 2 - i)); 684 cookies = malloc(ncookies * sizeof (off_t), 685 M_TEMP, M_WAITOK); 686 *ap->a_cookies = cookies; 687 } 688 689 for (; i < 2; i++) { 690 switch (i) { 691 case 0: /* `.' */ 692 case 1: /* `..' */ 693 d.d_fileno = PTYFS_FILENO(0, PTYFSroot); 694 d.d_namlen = i + 1; 695 (void)memcpy(d.d_name, "..", d.d_namlen); 696 d.d_name[i + 1] = '\0'; 697 d.d_type = DT_DIR; 698 break; 699 } 700 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 701 break; 702 if (cookies) 703 *cookies++ = i + 1; 704 nc++; 705 } 706 if (error) { 707 ncookies = nc; 708 break; 709 } 710 for (; uio->uio_resid >= UIO_MX && i < npty; i++) { 711 /* check for used ptys */ 712 if (pty_isfree(i - 2, 1)) 713 continue; 714 715 d.d_fileno = PTYFS_FILENO(i - 2, PTYFSpts); 716 d.d_namlen = snprintf(d.d_name, sizeof(d.d_name), 717 "%lld", (long long)(i - 2)); 718 d.d_type = DT_CHR; 719 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 720 break; 721 if (cookies) 722 *cookies++ = i + 1; 723 nc++; 724 } 725 ncookies = nc; 726 break; 727 728 default: 729 error = ENOTDIR; 730 break; 731 } 732 733 if (ap->a_ncookies) { 734 if (error) { 735 if (cookies) 736 free(*ap->a_cookies, M_TEMP); 737 *ap->a_ncookies = 0; 738 *ap->a_cookies = NULL; 739 } else 740 *ap->a_ncookies = ncookies; 741 } 742 uio->uio_offset = i; 743 return error; 744 } 745 746 int 747 ptyfs_open(void *v) 748 { 749 struct vop_open_args /* { 750 struct vnode *a_vp; 751 int a_mode; 752 struct ucred *a_cred; 753 struct proc *a_p; 754 } */ *ap = v; 755 struct vnode *vp = ap->a_vp; 756 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 757 758 ptyfs->ptyfs_flag |= PTYFS_CHANGE|PTYFS_ACCESS; 759 switch (ptyfs->ptyfs_type) { 760 case PTYFSpts: 761 case PTYFSptc: 762 return spec_open(v); 763 case PTYFSroot: 764 return 0; 765 default: 766 return EINVAL; 767 } 768 } 769 770 int 771 ptyfs_close(void *v) 772 { 773 struct vop_close_args /* { 774 struct vnode *a_vp; 775 int a_fflag; 776 struct ucred *a_cred; 777 struct proc *a_p; 778 } */ *ap = v; 779 struct vnode *vp = ap->a_vp; 780 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 781 struct timespec ts; 782 783 simple_lock(&vp->v_interlock); 784 if (vp->v_usecount > 1) { 785 TIMEVAL_TO_TIMESPEC(&time, &ts); 786 ptyfs_time(ptyfs, &ts, &ts); 787 } 788 simple_unlock(&vp->v_interlock); 789 790 switch (ptyfs->ptyfs_type) { 791 case PTYFSpts: 792 case PTYFSptc: 793 return spec_close(v); 794 case PTYFSroot: 795 return 0; 796 default: 797 return EINVAL; 798 } 799 } 800 801 int 802 ptyfs_read(void *v) 803 { 804 struct vop_read_args /* { 805 struct vnode *a_vp; 806 struct uio *a_uio; 807 int a_ioflag; 808 struct ucred *a_cred; 809 } */ *ap = v; 810 struct vnode *vp = ap->a_vp; 811 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 812 int error; 813 814 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 815 switch (ptyfs->ptyfs_type) { 816 case PTYFSpts: 817 VOP_UNLOCK(vp, 0); 818 error = (*pts_cdevsw.d_read)(vp->v_rdev, ap->a_uio, 819 ap->a_ioflag); 820 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 821 return error; 822 case PTYFSptc: 823 VOP_UNLOCK(vp, 0); 824 error = (*ptc_cdevsw.d_read)(vp->v_rdev, ap->a_uio, 825 ap->a_ioflag); 826 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 827 return error; 828 default: 829 return EOPNOTSUPP; 830 } 831 } 832 833 int 834 ptyfs_write(void *v) 835 { 836 struct vop_write_args /* { 837 struct vnode *a_vp; 838 struct uio *a_uio; 839 int a_ioflag; 840 struct ucred *a_cred; 841 } */ *ap = v; 842 int error; 843 struct vnode *vp = ap->a_vp; 844 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 845 846 ptyfs->ptyfs_flag |= PTYFS_MODIFY; 847 switch (ptyfs->ptyfs_type) { 848 case PTYFSpts: 849 VOP_UNLOCK(vp, 0); 850 error = (*pts_cdevsw.d_write)(vp->v_rdev, ap->a_uio, 851 ap->a_ioflag); 852 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 853 return error; 854 case PTYFSptc: 855 VOP_UNLOCK(vp, 0); 856 error = (*ptc_cdevsw.d_write)(vp->v_rdev, ap->a_uio, 857 ap->a_ioflag); 858 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 859 return error; 860 default: 861 return EOPNOTSUPP; 862 } 863 } 864 865 int 866 ptyfs_ioctl(void *v) 867 { 868 struct vop_ioctl_args /* { 869 struct vnode *a_vp; 870 u_long a_command; 871 void *a_data; 872 int a_fflag; 873 struct ucred *a_cred; 874 struct proc *a_p; 875 } */ *ap = v; 876 struct vnode *vp = ap->a_vp; 877 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 878 879 switch (ptyfs->ptyfs_type) { 880 case PTYFSpts: 881 return (*pts_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command, 882 ap->a_data, ap->a_fflag, ap->a_p); 883 case PTYFSptc: 884 return (*ptc_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command, 885 ap->a_data, ap->a_fflag, ap->a_p); 886 default: 887 return EOPNOTSUPP; 888 } 889 } 890 891 int 892 ptyfs_poll(void *v) 893 { 894 struct vop_poll_args /* { 895 struct vnode *a_vp; 896 int a_events; 897 struct proc *a_p; 898 } */ *ap = v; 899 struct vnode *vp = ap->a_vp; 900 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 901 902 switch (ptyfs->ptyfs_type) { 903 case PTYFSpts: 904 return (*pts_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_p); 905 case PTYFSptc: 906 return (*ptc_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_p); 907 default: 908 return genfs_poll(v); 909 } 910 } 911 912 int 913 ptyfs_kqfilter(void *v) 914 { 915 struct vop_kqfilter_args /* { 916 struct vnode *a_vp; 917 struct knote *a_kn; 918 } */ *ap = v; 919 struct vnode *vp = ap->a_vp; 920 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 921 922 switch (ptyfs->ptyfs_type) { 923 case PTYFSpts: 924 return (*pts_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn); 925 case PTYFSptc: 926 return (*ptc_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn); 927 default: 928 return genfs_kqfilter(v); 929 } 930 } 931 932 int 933 ptyfs_update(v) 934 void *v; 935 { 936 struct vop_update_args /* { 937 struct vnode *a_vp; 938 struct timespec *a_access; 939 struct timespec *a_modify; 940 int a_flags; 941 } */ *ap = v; 942 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 943 struct timespec ts; 944 945 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 946 return 0; 947 948 TIMEVAL_TO_TIMESPEC(&time, &ts); 949 if (ap->a_access == NULL) 950 ap->a_access = &ts; 951 if (ap->a_modify == NULL) 952 ap->a_modify = &ts; 953 ptyfs_time(ptyfs, ap->a_access, ap->a_modify); 954 return 0; 955 } 956 957 static void 958 ptyfs_time(struct ptyfsnode *ptyfs, struct timespec *atime, 959 struct timespec *mtime) 960 { 961 if (ptyfs->ptyfs_flag & PTYFS_MODIFY) { 962 ptyfs->ptyfs_mtime = *mtime; 963 ptyfs->ptyfs_atime = *atime; 964 } else if (ptyfs->ptyfs_flag & PTYFS_ACCESS) 965 ptyfs->ptyfs_atime = *atime; 966 if (ptyfs->ptyfs_flag & PTYFS_CHANGE) 967 ptyfs->ptyfs_ctime = *atime; 968 ptyfs->ptyfs_flag = 0; 969 } 970 971 /* 972 * convert decimal ascii to int 973 */ 974 static int 975 atoi(const char *b, size_t len) 976 { 977 int p = 0; 978 979 while (len--) { 980 char c = *b++; 981 if (c < '0' || c > '9') 982 return -1; 983 p = 10 * p + (c - '0'); 984 } 985 986 return p; 987 } 988
Indexes created Fri Sep 26 20:09:58 GMT 2025