ptyfs_vnops.c revision 1.11
1 /* $NetBSD: ptyfs_vnops.c,v 1.11 2005/11/02 12:38:58 yamt 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 1.11 2005/11/02 12:38:58 yamt 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_bwrite genfs_eopnotsupp 150 #define ptyfs_putpages genfs_null_putpages 151 152 static int ptyfs_update(struct vnode *, const struct timespec *, 153 const struct timespec *, int); 154 static int ptyfs_chown(struct vnode *, uid_t, gid_t, struct ucred *, 155 struct proc *); 156 static int ptyfs_chmod(struct vnode *, mode_t, struct ucred *, struct proc *); 157 static int atoi(const char *, size_t); 158 159 extern const struct cdevsw pts_cdevsw, ptc_cdevsw; 160 161 /* 162 * ptyfs vnode operations. 163 */ 164 int (**ptyfs_vnodeop_p)(void *); 165 const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = { 166 { &vop_default_desc, vn_default_error }, 167 { &vop_lookup_desc, ptyfs_lookup }, /* lookup */ 168 { &vop_create_desc, ptyfs_create }, /* create */ 169 { &vop_mknod_desc, ptyfs_mknod }, /* mknod */ 170 { &vop_open_desc, ptyfs_open }, /* open */ 171 { &vop_close_desc, ptyfs_close }, /* close */ 172 { &vop_access_desc, ptyfs_access }, /* access */ 173 { &vop_getattr_desc, ptyfs_getattr }, /* getattr */ 174 { &vop_setattr_desc, ptyfs_setattr }, /* setattr */ 175 { &vop_read_desc, ptyfs_read }, /* read */ 176 { &vop_write_desc, ptyfs_write }, /* write */ 177 { &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */ 178 { &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */ 179 { &vop_poll_desc, ptyfs_poll }, /* poll */ 180 { &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */ 181 { &vop_revoke_desc, ptyfs_revoke }, /* revoke */ 182 { &vop_mmap_desc, ptyfs_mmap }, /* mmap */ 183 { &vop_fsync_desc, ptyfs_fsync }, /* fsync */ 184 { &vop_seek_desc, ptyfs_seek }, /* seek */ 185 { &vop_remove_desc, ptyfs_remove }, /* remove */ 186 { &vop_link_desc, ptyfs_link }, /* link */ 187 { &vop_rename_desc, ptyfs_rename }, /* rename */ 188 { &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */ 189 { &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */ 190 { &vop_symlink_desc, ptyfs_symlink }, /* symlink */ 191 { &vop_readdir_desc, ptyfs_readdir }, /* readdir */ 192 { &vop_readlink_desc, ptyfs_readlink }, /* readlink */ 193 { &vop_abortop_desc, ptyfs_abortop }, /* abortop */ 194 { &vop_inactive_desc, spec_inactive }, /* inactive */ 195 { &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */ 196 { &vop_lock_desc, ptyfs_lock }, /* lock */ 197 { &vop_unlock_desc, ptyfs_unlock }, /* unlock */ 198 { &vop_bmap_desc, ptyfs_bmap }, /* bmap */ 199 { &vop_strategy_desc, ptyfs_strategy }, /* strategy */ 200 { &vop_print_desc, ptyfs_print }, /* print */ 201 { &vop_islocked_desc, ptyfs_islocked }, /* islocked */ 202 { &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */ 203 { &vop_advlock_desc, ptyfs_advlock }, /* advlock */ 204 { &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */ 205 { &vop_putpages_desc, ptyfs_putpages }, /* putpages */ 206 { NULL, NULL } 207 }; 208 const struct vnodeopv_desc ptyfs_vnodeop_opv_desc = 209 { &ptyfs_vnodeop_p, ptyfs_vnodeop_entries }; 210 211 /* 212 * _reclaim is called when getnewvnode() 213 * wants to make use of an entry on the vnode 214 * free list. at this time the filesystem needs 215 * to free any private data and remove the node 216 * from any private lists. 217 */ 218 int 219 ptyfs_reclaim(void *v) 220 { 221 struct vop_reclaim_args /* { 222 struct vnode *a_vp; 223 } */ *ap = v; 224 return ptyfs_freevp(ap->a_vp); 225 } 226 227 /* 228 * Return POSIX pathconf information applicable to special devices. 229 */ 230 int 231 ptyfs_pathconf(void *v) 232 { 233 struct vop_pathconf_args /* { 234 struct vnode *a_vp; 235 int a_name; 236 register_t *a_retval; 237 } */ *ap = v; 238 239 switch (ap->a_name) { 240 case _PC_LINK_MAX: 241 *ap->a_retval = LINK_MAX; 242 return 0; 243 case _PC_MAX_CANON: 244 *ap->a_retval = MAX_CANON; 245 return 0; 246 case _PC_MAX_INPUT: 247 *ap->a_retval = MAX_INPUT; 248 return 0; 249 case _PC_PIPE_BUF: 250 *ap->a_retval = PIPE_BUF; 251 return 0; 252 case _PC_CHOWN_RESTRICTED: 253 *ap->a_retval = 1; 254 return 0; 255 case _PC_VDISABLE: 256 *ap->a_retval = _POSIX_VDISABLE; 257 return 0; 258 case _PC_SYNC_IO: 259 *ap->a_retval = 1; 260 return 0; 261 default: 262 return EINVAL; 263 } 264 } 265 266 /* 267 * _print is used for debugging. 268 * just print a readable description 269 * of (vp). 270 */ 271 int 272 ptyfs_print(void *v) 273 { 274 struct vop_print_args /* { 275 struct vnode *a_vp; 276 } */ *ap = v; 277 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 278 279 printf("tag VT_PTYFS, type %d, pty %d\n", 280 ptyfs->ptyfs_type, ptyfs->ptyfs_pty); 281 return 0; 282 } 283 284 /* 285 * Invent attributes for ptyfsnode (vp) and store 286 * them in (vap). 287 * Directories lengths are returned as zero since 288 * any real length would require the genuine size 289 * to be computed, and nothing cares anyway. 290 * 291 * this is relatively minimal for ptyfs. 292 */ 293 int 294 ptyfs_getattr(void *v) 295 { 296 struct vop_getattr_args /* { 297 struct vnode *a_vp; 298 struct vattr *a_vap; 299 struct ucred *a_cred; 300 struct proc *a_p; 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 struct ucred *a_cred; 357 struct proc *a_p; 358 } */ *ap = v; 359 struct vnode *vp = ap->a_vp; 360 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 361 struct vattr *vap = ap->a_vap; 362 struct ucred *cred = ap->a_cred; 363 struct proc *p = ap->a_p; 364 int error; 365 366 if (vap->va_size != VNOVAL) { 367 switch (ptyfs->ptyfs_type) { 368 case PTYFSroot: 369 return EISDIR; 370 case PTYFSpts: 371 case PTYFSptc: 372 break; 373 default: 374 return EINVAL; 375 } 376 } 377 378 if (vap->va_flags != VNOVAL) { 379 if (vp->v_mount->mnt_flag & MNT_RDONLY) 380 return EROFS; 381 if (cred->cr_uid != ptyfs->ptyfs_uid && 382 (error = suser(cred, &p->p_acflag)) != 0) 383 return error; 384 if (cred->cr_uid == 0) { 385 if ((ptyfs->ptyfs_flags & (SF_IMMUTABLE | SF_APPEND)) && 386 securelevel > 0) 387 return EPERM; 388 /* Snapshot flag cannot be set or cleared */ 389 if ((vap->va_flags & SF_SNAPSHOT) != 390 (ptyfs->ptyfs_flags & SF_SNAPSHOT)) 391 return EPERM; 392 ptyfs->ptyfs_flags = vap->va_flags; 393 } else { 394 if ((ptyfs->ptyfs_flags & (SF_IMMUTABLE | SF_APPEND)) || 395 (vap->va_flags & UF_SETTABLE) != vap->va_flags) 396 return EPERM; 397 if ((ptyfs->ptyfs_flags & SF_SETTABLE) != 398 (vap->va_flags & SF_SETTABLE)) 399 return EPERM; 400 ptyfs->ptyfs_flags &= SF_SETTABLE; 401 ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); 402 } 403 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 404 if (vap->va_flags & (IMMUTABLE | APPEND)) 405 return 0; 406 } 407 if (ptyfs->ptyfs_flags & (IMMUTABLE | APPEND)) 408 return EPERM; 409 /* 410 * Go through the fields and update iff not VNOVAL. 411 */ 412 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 413 if (vp->v_mount->mnt_flag & MNT_RDONLY) 414 return EROFS; 415 if (ptyfs->ptyfs_type == PTYFSroot) 416 return EPERM; 417 error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, p); 418 if (error) 419 return error; 420 } 421 422 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || 423 vap->va_birthtime.tv_sec != VNOVAL) { 424 if (vp->v_mount->mnt_flag & MNT_RDONLY) 425 return EROFS; 426 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) 427 return EPERM; 428 if (cred->cr_uid != ptyfs->ptyfs_uid && 429 (error = suser(cred, &p->p_acflag)) && 430 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 431 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)) 432 return (error); 433 if (vap->va_atime.tv_sec != VNOVAL) 434 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 435 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 436 if (vap->va_mtime.tv_sec != VNOVAL) 437 ptyfs->ptyfs_flag |= PTYFS_CHANGE | PTYFS_MODIFY; 438 if (vap->va_birthtime.tv_sec != VNOVAL) 439 ptyfs->ptyfs_birthtime = vap->va_birthtime; 440 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 441 error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); 442 if (error) 443 return error; 444 } 445 if (vap->va_mode != (mode_t)VNOVAL) { 446 if (vp->v_mount->mnt_flag & MNT_RDONLY) 447 return EROFS; 448 if (ptyfs->ptyfs_type == PTYFSroot) 449 return EPERM; 450 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 451 (vap->va_mode & 452 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 453 return EPERM; 454 error = ptyfs_chmod(vp, vap->va_mode, cred, p); 455 if (error) 456 return error; 457 } 458 VN_KNOTE(vp, NOTE_ATTRIB); 459 return 0; 460 } 461 462 /* 463 * Change the mode on a file. 464 * Inode must be locked before calling. 465 */ 466 static int 467 ptyfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct proc *p) 468 { 469 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 470 int error; 471 472 if (cred->cr_uid != ptyfs->ptyfs_uid && 473 (error = suser(cred, &p->p_acflag)) != 0) 474 return error; 475 ptyfs->ptyfs_mode &= ~ALLPERMS; 476 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 477 return 0; 478 } 479 480 /* 481 * Perform chown operation on inode ip; 482 * inode must be locked prior to call. 483 */ 484 static int 485 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred, 486 struct proc *p) 487 { 488 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 489 int error; 490 491 if (uid == (uid_t)VNOVAL) 492 uid = ptyfs->ptyfs_uid; 493 if (gid == (gid_t)VNOVAL) 494 gid = ptyfs->ptyfs_gid; 495 /* 496 * If we don't own the file, are trying to change the owner 497 * of the file, or are not a member of the target group, 498 * the caller's credentials must imply super-user privilege 499 * or the call fails. 500 */ 501 if ((cred->cr_uid != ptyfs->ptyfs_uid || uid != ptyfs->ptyfs_uid || 502 (gid != ptyfs->ptyfs_gid && 503 !(cred->cr_gid == gid || groupmember((gid_t)gid, cred)))) && 504 ((error = suser(cred, &p->p_acflag)) != 0)) 505 return error; 506 507 ptyfs->ptyfs_gid = gid; 508 ptyfs->ptyfs_uid = uid; 509 return 0; 510 } 511 512 /* 513 * implement access checking. 514 * 515 * actually, the check for super-user is slightly 516 * broken since it will allow read access to write-only 517 * objects. this doesn't cause any particular trouble 518 * but does mean that the i/o entry points need to check 519 * that the operation really does make sense. 520 */ 521 int 522 ptyfs_access(void *v) 523 { 524 struct vop_access_args /* { 525 struct vnode *a_vp; 526 int a_mode; 527 struct ucred *a_cred; 528 struct proc *a_p; 529 } */ *ap = v; 530 struct vattr va; 531 int error; 532 533 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred, ap->a_p)) != 0) 534 return error; 535 536 return vaccess(va.va_type, va.va_mode, 537 va.va_uid, va.va_gid, ap->a_mode, ap->a_cred); 538 } 539 540 /* 541 * lookup. this is incredibly complicated in the 542 * general case, however for most pseudo-filesystems 543 * very little needs to be done. 544 * 545 * Locking isn't hard here, just poorly documented. 546 * 547 * If we're looking up ".", just vref the parent & return it. 548 * 549 * If we're looking up "..", unlock the parent, and lock "..". If everything 550 * went ok, and we're on the last component and the caller requested the 551 * parent locked, try to re-lock the parent. We do this to prevent lock 552 * races. 553 * 554 * For anything else, get the needed node. Then unlock the parent if not 555 * the last component or not LOCKPARENT (i.e. if we wouldn't re-lock the 556 * parent in the .. case). 557 * 558 * We try to exit with the parent locked in error cases. 559 */ 560 int 561 ptyfs_lookup(void *v) 562 { 563 struct vop_lookup_args /* { 564 struct vnode * a_dvp; 565 struct vnode ** a_vpp; 566 struct componentname * a_cnp; 567 } */ *ap = v; 568 struct componentname *cnp = ap->a_cnp; 569 struct vnode **vpp = ap->a_vpp; 570 struct vnode *dvp = ap->a_dvp; 571 const char *pname = cnp->cn_nameptr; 572 struct ptyfsnode *ptyfs; 573 int pty, error, wantpunlock; 574 575 *vpp = NULL; 576 cnp->cn_flags &= ~PDIRUNLOCK; 577 578 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 579 return EROFS; 580 581 if (cnp->cn_namelen == 1 && *pname == '.') { 582 *vpp = dvp; 583 VREF(dvp); 584 return 0; 585 } 586 587 wantpunlock = ~cnp->cn_flags & (LOCKPARENT | ISLASTCN); 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 curproc); 604 if (error == 0 && wantpunlock) { 605 VOP_UNLOCK(dvp, 0); 606 cnp->cn_flags |= PDIRUNLOCK; 607 } 608 return error; 609 610 default: 611 return ENOTDIR; 612 } 613 614 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 615 } 616 617 /* 618 * readdir returns directory entries from ptyfsnode (vp). 619 * 620 * the strategy here with ptyfs is to generate a single 621 * directory entry at a time (struct dirent) and then 622 * copy that out to userland using uiomove. a more efficent 623 * though more complex implementation, would try to minimize 624 * the number of calls to uiomove(). for ptyfs, this is 625 * hardly worth the added code complexity. 626 * 627 * this should just be done through read() 628 */ 629 int 630 ptyfs_readdir(void *v) 631 { 632 struct vop_readdir_args /* { 633 struct vnode *a_vp; 634 struct uio *a_uio; 635 struct ucred *a_cred; 636 int *a_eofflag; 637 off_t **a_cookies; 638 int *a_ncookies; 639 } */ *ap = v; 640 struct uio *uio = ap->a_uio; 641 struct dirent d; 642 struct ptyfsnode *ptyfs; 643 off_t i; 644 int error; 645 off_t *cookies = NULL; 646 int ncookies; 647 struct vnode *vp; 648 int nc = 0; 649 650 vp = ap->a_vp; 651 ptyfs = VTOPTYFS(vp); 652 653 if (uio->uio_resid < UIO_MX) 654 return EINVAL; 655 if (uio->uio_offset < 0) 656 return EINVAL; 657 658 error = 0; 659 i = uio->uio_offset; 660 (void)memset(&d, 0, sizeof(d)); 661 d.d_reclen = UIO_MX; 662 ncookies = uio->uio_resid / UIO_MX; 663 664 switch (ptyfs->ptyfs_type) { 665 case PTYFSroot: /* root */ 666 667 if (i >= npty) 668 return 0; 669 670 if (ap->a_ncookies) { 671 ncookies = min(ncookies, (npty + 2 - i)); 672 cookies = malloc(ncookies * sizeof (off_t), 673 M_TEMP, M_WAITOK); 674 *ap->a_cookies = cookies; 675 } 676 677 for (; i < 2; i++) { 678 switch (i) { 679 case 0: /* `.' */ 680 case 1: /* `..' */ 681 d.d_fileno = PTYFS_FILENO(0, PTYFSroot); 682 d.d_namlen = i + 1; 683 (void)memcpy(d.d_name, "..", d.d_namlen); 684 d.d_name[i + 1] = '\0'; 685 d.d_type = DT_DIR; 686 break; 687 } 688 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 689 break; 690 if (cookies) 691 *cookies++ = i + 1; 692 nc++; 693 } 694 if (error) { 695 ncookies = nc; 696 break; 697 } 698 for (; uio->uio_resid >= UIO_MX && i < npty; i++) { 699 /* check for used ptys */ 700 if (pty_isfree(i - 2, 1)) 701 continue; 702 703 d.d_fileno = PTYFS_FILENO(i - 2, PTYFSpts); 704 d.d_namlen = snprintf(d.d_name, sizeof(d.d_name), 705 "%lld", (long long)(i - 2)); 706 d.d_type = DT_CHR; 707 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 708 break; 709 if (cookies) 710 *cookies++ = i + 1; 711 nc++; 712 } 713 ncookies = nc; 714 break; 715 716 default: 717 error = ENOTDIR; 718 break; 719 } 720 721 if (ap->a_ncookies) { 722 if (error) { 723 if (cookies) 724 free(*ap->a_cookies, M_TEMP); 725 *ap->a_ncookies = 0; 726 *ap->a_cookies = NULL; 727 } else 728 *ap->a_ncookies = ncookies; 729 } 730 uio->uio_offset = i; 731 return error; 732 } 733 734 int 735 ptyfs_open(void *v) 736 { 737 struct vop_open_args /* { 738 struct vnode *a_vp; 739 int a_mode; 740 struct ucred *a_cred; 741 struct proc *a_p; 742 } */ *ap = v; 743 struct vnode *vp = ap->a_vp; 744 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 745 746 ptyfs->ptyfs_flag |= PTYFS_CHANGE|PTYFS_ACCESS; 747 switch (ptyfs->ptyfs_type) { 748 case PTYFSpts: 749 case PTYFSptc: 750 return spec_open(v); 751 case PTYFSroot: 752 return 0; 753 default: 754 return EINVAL; 755 } 756 } 757 758 int 759 ptyfs_close(void *v) 760 { 761 struct vop_close_args /* { 762 struct vnode *a_vp; 763 int a_fflag; 764 struct ucred *a_cred; 765 struct proc *a_p; 766 } */ *ap = v; 767 struct vnode *vp = ap->a_vp; 768 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 769 770 simple_lock(&vp->v_interlock); 771 if (vp->v_usecount > 1) 772 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 773 simple_unlock(&vp->v_interlock); 774 775 switch (ptyfs->ptyfs_type) { 776 case PTYFSpts: 777 case PTYFSptc: 778 return spec_close(v); 779 case PTYFSroot: 780 return 0; 781 default: 782 return EINVAL; 783 } 784 } 785 786 int 787 ptyfs_read(void *v) 788 { 789 struct vop_read_args /* { 790 struct vnode *a_vp; 791 struct uio *a_uio; 792 int a_ioflag; 793 struct ucred *a_cred; 794 } */ *ap = v; 795 struct timespec ts; 796 struct vnode *vp = ap->a_vp; 797 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 798 int error; 799 800 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 801 /* hardclock() resolution is good enough for ptyfs */ 802 TIMEVAL_TO_TIMESPEC(&time, &ts); 803 (void)ptyfs_update(vp, &ts, &ts, 0); 804 805 switch (ptyfs->ptyfs_type) { 806 case PTYFSpts: 807 VOP_UNLOCK(vp, 0); 808 error = (*pts_cdevsw.d_read)(vp->v_rdev, ap->a_uio, 809 ap->a_ioflag); 810 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 811 return error; 812 case PTYFSptc: 813 VOP_UNLOCK(vp, 0); 814 error = (*ptc_cdevsw.d_read)(vp->v_rdev, ap->a_uio, 815 ap->a_ioflag); 816 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 817 return error; 818 default: 819 return EOPNOTSUPP; 820 } 821 } 822 823 int 824 ptyfs_write(void *v) 825 { 826 struct vop_write_args /* { 827 struct vnode *a_vp; 828 struct uio *a_uio; 829 int a_ioflag; 830 struct ucred *a_cred; 831 } */ *ap = v; 832 struct timespec ts; 833 struct vnode *vp = ap->a_vp; 834 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 835 int error; 836 837 ptyfs->ptyfs_flag |= PTYFS_MODIFY; 838 /* hardclock() resolution is good enough for ptyfs */ 839 TIMEVAL_TO_TIMESPEC(&time, &ts); 840 (void)ptyfs_update(vp, &ts, &ts, 0); 841 842 switch (ptyfs->ptyfs_type) { 843 case PTYFSpts: 844 VOP_UNLOCK(vp, 0); 845 error = (*pts_cdevsw.d_write)(vp->v_rdev, ap->a_uio, 846 ap->a_ioflag); 847 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 848 return error; 849 case PTYFSptc: 850 VOP_UNLOCK(vp, 0); 851 error = (*ptc_cdevsw.d_write)(vp->v_rdev, ap->a_uio, 852 ap->a_ioflag); 853 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 854 return error; 855 default: 856 return EOPNOTSUPP; 857 } 858 } 859 860 int 861 ptyfs_ioctl(void *v) 862 { 863 struct vop_ioctl_args /* { 864 struct vnode *a_vp; 865 u_long a_command; 866 void *a_data; 867 int a_fflag; 868 struct ucred *a_cred; 869 struct proc *a_p; 870 } */ *ap = v; 871 struct vnode *vp = ap->a_vp; 872 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 873 874 switch (ptyfs->ptyfs_type) { 875 case PTYFSpts: 876 return (*pts_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command, 877 ap->a_data, ap->a_fflag, ap->a_p); 878 case PTYFSptc: 879 return (*ptc_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command, 880 ap->a_data, ap->a_fflag, ap->a_p); 881 default: 882 return EOPNOTSUPP; 883 } 884 } 885 886 int 887 ptyfs_poll(void *v) 888 { 889 struct vop_poll_args /* { 890 struct vnode *a_vp; 891 int a_events; 892 struct proc *a_p; 893 } */ *ap = v; 894 struct vnode *vp = ap->a_vp; 895 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 896 897 switch (ptyfs->ptyfs_type) { 898 case PTYFSpts: 899 return (*pts_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_p); 900 case PTYFSptc: 901 return (*ptc_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_p); 902 default: 903 return genfs_poll(v); 904 } 905 } 906 907 int 908 ptyfs_kqfilter(void *v) 909 { 910 struct vop_kqfilter_args /* { 911 struct vnode *a_vp; 912 struct knote *a_kn; 913 } */ *ap = v; 914 struct vnode *vp = ap->a_vp; 915 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 916 917 switch (ptyfs->ptyfs_type) { 918 case PTYFSpts: 919 return (*pts_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn); 920 case PTYFSptc: 921 return (*ptc_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn); 922 default: 923 return genfs_kqfilter(v); 924 } 925 } 926 927 static int 928 ptyfs_update(struct vnode *vp, const struct timespec *acc, 929 const struct timespec *mod, int flags) 930 { 931 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 932 933 if (vp->v_mount->mnt_flag & MNT_RDONLY) 934 return 0; 935 936 PTYFS_ITIMES(ptyfs, acc, mod, NULL); 937 return 0; 938 } 939 940 void 941 ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, 942 const struct timespec *mod, const struct timespec *cre) 943 { 944 struct timespec *ts = NULL, tsb; 945 946 KASSERT(ptyfs->ptyfs_flag & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); 947 if (ptyfs->ptyfs_flag & (PTYFS_ACCESS|PTYFS_MODIFY)) { 948 if (acc == NULL) 949 acc = ts == NULL ? (ts = nanotime(&tsb)) : ts; 950 ptyfs->ptyfs_atime = *acc; 951 } 952 if (ptyfs->ptyfs_flag & PTYFS_MODIFY) { 953 if (mod == NULL) 954 mod = ts == NULL ? (ts = nanotime(&tsb)) : ts; 955 ptyfs->ptyfs_mtime = *mod; 956 } 957 if (ptyfs->ptyfs_flag & PTYFS_CHANGE) { 958 if (cre == NULL) 959 cre = ts == NULL ? (ts = nanotime(&tsb)) : ts; 960 ptyfs->ptyfs_ctime = *cre; 961 } 962 ptyfs->ptyfs_flag &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); 963 } 964 965 /* 966 * convert decimal ascii to int 967 */ 968 static int 969 atoi(const char *b, size_t len) 970 { 971 int p = 0; 972 973 while (len--) { 974 char c = *b++; 975 if (c < '0' || c > '9') 976 return -1; 977 p = 10 * p + (c - '0'); 978 } 979 980 return p; 981 } 982
Indexes created Sat Sep 27 22:09:54 GMT 2025