1 /*- 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 /* 29 * POSIX message queue implementation. 30 * 31 * 1) A mqueue filesystem can be mounted, each message queue appears 32 * in mounted directory, user can change queue's permission and 33 * ownership, or remove a queue. Manually creating a file in the 34 * directory causes a message queue to be created in the kernel with 35 * default message queue attributes applied and same name used, this 36 * method is not advocated since mq_open syscall allows user to specify 37 * different attributes. Also the file system can be mounted multiple 38 * times at different mount points but shows same contents. 39 * 40 * 2) Standard POSIX message queue API. The syscalls do not use vfs layer, 41 * but directly operate on internal data structure, this allows user to 42 * use the IPC facility without having to mount mqueue file system. 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include "opt_capsicum.h" 49 #include "opt_compat.h" 50 51 #include <sys/param.h> 52 #include <sys/kernel.h> 53 #include <sys/systm.h> 54 #include <sys/limits.h> 55 #include <sys/buf.h> 56 #include <sys/capability.h> 57 #include <sys/dirent.h> 58 #include <sys/event.h> 59 #include <sys/eventhandler.h> 60 #include <sys/fcntl.h> 61 #include <sys/file.h> 62 #include <sys/filedesc.h> 63 #include <sys/lock.h> 64 #include <sys/malloc.h> 65 #include <sys/module.h> 66 #include <sys/mount.h> 67 #include <sys/mqueue.h> 68 #include <sys/mutex.h> 69 #include <sys/namei.h> 70 #include <sys/posix4.h> 71 #include <sys/poll.h> 72 #include <sys/priv.h> 73 #include <sys/proc.h> 74 #include <sys/queue.h> 75 #include <sys/sysproto.h> 76 #include <sys/stat.h> 77 #include <sys/syscall.h> 78 #include <sys/syscallsubr.h> 79 #include <sys/sysent.h> 80 #include <sys/sx.h> 81 #include <sys/sysctl.h> 82 #include <sys/taskqueue.h> 83 #include <sys/unistd.h> 84 #include <sys/vnode.h> 85 #include <machine/atomic.h> 86 87 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support"); 88 89 /* 90 * Limits and constants 91 */ 92 #define MQFS_NAMELEN NAME_MAX 93 #define MQFS_DELEN (8 + MQFS_NAMELEN) 94 95 /* node types */ 96 typedef enum { 97 mqfstype_none = 0, 98 mqfstype_root, 99 mqfstype_dir, 100 mqfstype_this, 101 mqfstype_parent, 102 mqfstype_file, 103 mqfstype_symlink, 104 } mqfs_type_t; 105 106 struct mqfs_node; 107 108 /* 109 * mqfs_info: describes a mqfs instance 110 */ 111 struct mqfs_info { 112 struct sx mi_lock; 113 struct mqfs_node *mi_root; 114 struct unrhdr *mi_unrhdr; 115 }; 116 117 struct mqfs_vdata { 118 LIST_ENTRY(mqfs_vdata) mv_link; 119 struct mqfs_node *mv_node; 120 struct vnode *mv_vnode; 121 struct task mv_task; 122 }; 123 124 /* 125 * mqfs_node: describes a node (file or directory) within a mqfs 126 */ 127 struct mqfs_node { 128 char mn_name[MQFS_NAMELEN+1]; 129 struct mqfs_info *mn_info; 130 struct mqfs_node *mn_parent; 131 LIST_HEAD(,mqfs_node) mn_children; 132 LIST_ENTRY(mqfs_node) mn_sibling; 133 LIST_HEAD(,mqfs_vdata) mn_vnodes; 134 int mn_refcount; 135 mqfs_type_t mn_type; 136 int mn_deleted; 137 uint32_t mn_fileno; 138 void *mn_data; 139 struct timespec mn_birth; 140 struct timespec mn_ctime; 141 struct timespec mn_atime; 142 struct timespec mn_mtime; 143 uid_t mn_uid; 144 gid_t mn_gid; 145 int mn_mode; 146 }; 147 148 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node) 149 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data)) 150 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data)) 151 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \ 152 (fp)->f_data)->mn_data)) 153 154 TAILQ_HEAD(msgq, mqueue_msg); 155 156 struct mqueue; 157 158 struct mqueue_notifier { 159 LIST_ENTRY(mqueue_notifier) nt_link; 160 struct sigevent nt_sigev; 161 ksiginfo_t nt_ksi; 162 struct proc *nt_proc; 163 }; 164 165 struct mqueue { 166 struct mtx mq_mutex; 167 int mq_flags; 168 long mq_maxmsg; 169 long mq_msgsize; 170 long mq_curmsgs; 171 long mq_totalbytes; 172 struct msgq mq_msgq; 173 int mq_receivers; 174 int mq_senders; 175 struct selinfo mq_rsel; 176 struct selinfo mq_wsel; 177 struct mqueue_notifier *mq_notifier; 178 }; 179 180 #define MQ_RSEL 0x01 181 #define MQ_WSEL 0x02 182 183 struct mqueue_msg { 184 TAILQ_ENTRY(mqueue_msg) msg_link; 185 unsigned int msg_prio; 186 unsigned int msg_size; 187 /* following real data... */ 188 }; 189 190 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0, 191 "POSIX real time message queue"); 192 193 static int default_maxmsg = 10; 194 static int default_msgsize = 1024; 195 196 static int maxmsg = 100; 197 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW, 198 &maxmsg, 0, "Default maximum messages in queue"); 199 static int maxmsgsize = 16384; 200 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW, 201 &maxmsgsize, 0, "Default maximum message size"); 202 static int maxmq = 100; 203 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW, 204 &maxmq, 0, "maximum message queues"); 205 static int curmq = 0; 206 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW, 207 &curmq, 0, "current message queue number"); 208 static int unloadable = 0; 209 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data"); 210 211 static eventhandler_tag exit_tag; 212 213 /* Only one instance per-system */ 214 static struct mqfs_info mqfs_data; 215 static uma_zone_t mqnode_zone; 216 static uma_zone_t mqueue_zone; 217 static uma_zone_t mvdata_zone; 218 static uma_zone_t mqnoti_zone; 219 static struct vop_vector mqfs_vnodeops; 220 static struct fileops mqueueops; 221 222 /* 223 * Directory structure construction and manipulation 224 */ 225 #ifdef notyet 226 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent, 227 const char *name, int namelen, struct ucred *cred, int mode); 228 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent, 229 const char *name, int namelen, struct ucred *cred, int mode); 230 #endif 231 232 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent, 233 const char *name, int namelen, struct ucred *cred, int mode); 234 static int mqfs_destroy(struct mqfs_node *mn); 235 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn); 236 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn); 237 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn); 238 239 /* 240 * Message queue construction and maniplation 241 */ 242 static struct mqueue *mqueue_alloc(const struct mq_attr *attr); 243 static void mqueue_free(struct mqueue *mq); 244 static int mqueue_send(struct mqueue *mq, const char *msg_ptr, 245 size_t msg_len, unsigned msg_prio, int waitok, 246 const struct timespec *abs_timeout); 247 static int mqueue_receive(struct mqueue *mq, char *msg_ptr, 248 size_t msg_len, unsigned *msg_prio, int waitok, 249 const struct timespec *abs_timeout); 250 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, 251 int timo); 252 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, 253 int timo); 254 static void mqueue_send_notification(struct mqueue *mq); 255 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp); 256 static void mq_proc_exit(void *arg, struct proc *p); 257 258 /* 259 * kqueue filters 260 */ 261 static void filt_mqdetach(struct knote *kn); 262 static int filt_mqread(struct knote *kn, long hint); 263 static int filt_mqwrite(struct knote *kn, long hint); 264 265 struct filterops mq_rfiltops = { 266 .f_isfd = 1, 267 .f_detach = filt_mqdetach, 268 .f_event = filt_mqread, 269 }; 270 struct filterops mq_wfiltops = { 271 .f_isfd = 1, 272 .f_detach = filt_mqdetach, 273 .f_event = filt_mqwrite, 274 }; 275 276 /* 277 * Initialize fileno bitmap 278 */ 279 static void 280 mqfs_fileno_init(struct mqfs_info *mi) 281 { 282 struct unrhdr *up; 283 284 up = new_unrhdr(1, INT_MAX, NULL); 285 mi->mi_unrhdr = up; 286 } 287 288 /* 289 * Tear down fileno bitmap 290 */ 291 static void 292 mqfs_fileno_uninit(struct mqfs_info *mi) 293 { 294 struct unrhdr *up; 295 296 up = mi->mi_unrhdr; 297 mi->mi_unrhdr = NULL; 298 delete_unrhdr(up); 299 } 300 301 /* 302 * Allocate a file number 303 */ 304 static void 305 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn) 306 { 307 /* make sure our parent has a file number */ 308 if (mn->mn_parent && !mn->mn_parent->mn_fileno) 309 mqfs_fileno_alloc(mi, mn->mn_parent); 310 311 switch (mn->mn_type) { 312 case mqfstype_root: 313 case mqfstype_dir: 314 case mqfstype_file: 315 case mqfstype_symlink: 316 mn->mn_fileno = alloc_unr(mi->mi_unrhdr); 317 break; 318 case mqfstype_this: 319 KASSERT(mn->mn_parent != NULL, 320 ("mqfstype_this node has no parent")); 321 mn->mn_fileno = mn->mn_parent->mn_fileno; 322 break; 323 case mqfstype_parent: 324 KASSERT(mn->mn_parent != NULL, 325 ("mqfstype_parent node has no parent")); 326 if (mn->mn_parent == mi->mi_root) { 327 mn->mn_fileno = mn->mn_parent->mn_fileno; 328 break; 329 } 330 KASSERT(mn->mn_parent->mn_parent != NULL, 331 ("mqfstype_parent node has no grandparent")); 332 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno; 333 break; 334 default: 335 KASSERT(0, 336 ("mqfs_fileno_alloc() called for unknown type node: %d", 337 mn->mn_type)); 338 break; 339 } 340 } 341 342 /* 343 * Release a file number 344 */ 345 static void 346 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn) 347 { 348 switch (mn->mn_type) { 349 case mqfstype_root: 350 case mqfstype_dir: 351 case mqfstype_file: 352 case mqfstype_symlink: 353 free_unr(mi->mi_unrhdr, mn->mn_fileno); 354 break; 355 case mqfstype_this: 356 case mqfstype_parent: 357 /* ignore these, as they don't "own" their file number */ 358 break; 359 default: 360 KASSERT(0, 361 ("mqfs_fileno_free() called for unknown type node: %d", 362 mn->mn_type)); 363 break; 364 } 365 } 366 367 static __inline struct mqfs_node * 368 mqnode_alloc(void) 369 { 370 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO); 371 } 372 373 static __inline void 374 mqnode_free(struct mqfs_node *node) 375 { 376 uma_zfree(mqnode_zone, node); 377 } 378 379 static __inline void 380 mqnode_addref(struct mqfs_node *node) 381 { 382 atomic_fetchadd_int(&node->mn_refcount, 1); 383 } 384 385 static __inline void 386 mqnode_release(struct mqfs_node *node) 387 { 388 struct mqfs_info *mqfs; 389 int old, exp; 390 391 mqfs = node->mn_info; 392 old = atomic_fetchadd_int(&node->mn_refcount, -1); 393 if (node->mn_type == mqfstype_dir || 394 node->mn_type == mqfstype_root) 395 exp = 3; /* include . and .. */ 396 else 397 exp = 1; 398 if (old == exp) { 399 int locked = sx_xlocked(&mqfs->mi_lock); 400 if (!locked) 401 sx_xlock(&mqfs->mi_lock); 402 mqfs_destroy(node); 403 if (!locked) 404 sx_xunlock(&mqfs->mi_lock); 405 } 406 } 407 408 /* 409 * Add a node to a directory 410 */ 411 static int 412 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node) 413 { 414 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__)); 415 KASSERT(parent->mn_info != NULL, 416 ("%s(): parent has no mn_info", __func__)); 417 KASSERT(parent->mn_type == mqfstype_dir || 418 parent->mn_type == mqfstype_root, 419 ("%s(): parent is not a directory", __func__)); 420 421 node->mn_info = parent->mn_info; 422 node->mn_parent = parent; 423 LIST_INIT(&node->mn_children); 424 LIST_INIT(&node->mn_vnodes); 425 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling); 426 mqnode_addref(parent); 427 return (0); 428 } 429 430 static struct mqfs_node * 431 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode, 432 int nodetype) 433 { 434 struct mqfs_node *node; 435 436 node = mqnode_alloc(); 437 strncpy(node->mn_name, name, namelen); 438 node->mn_type = nodetype; 439 node->mn_refcount = 1; 440 vfs_timestamp(&node->mn_birth); 441 node->mn_ctime = node->mn_atime = node->mn_mtime 442 = node->mn_birth; 443 node->mn_uid = cred->cr_uid; 444 node->mn_gid = cred->cr_gid; 445 node->mn_mode = mode; 446 return (node); 447 } 448 449 /* 450 * Create a file 451 */ 452 static struct mqfs_node * 453 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen, 454 struct ucred *cred, int mode) 455 { 456 struct mqfs_node *node; 457 458 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file); 459 if (mqfs_add_node(parent, node) != 0) { 460 mqnode_free(node); 461 return (NULL); 462 } 463 return (node); 464 } 465 466 /* 467 * Add . and .. to a directory 468 */ 469 static int 470 mqfs_fixup_dir(struct mqfs_node *parent) 471 { 472 struct mqfs_node *dir; 473 474 dir = mqnode_alloc(); 475 dir->mn_name[0] = '.'; 476 dir->mn_type = mqfstype_this; 477 dir->mn_refcount = 1; 478 if (mqfs_add_node(parent, dir) != 0) { 479 mqnode_free(dir); 480 return (-1); 481 } 482 483 dir = mqnode_alloc(); 484 dir->mn_name[0] = dir->mn_name[1] = '.'; 485 dir->mn_type = mqfstype_parent; 486 dir->mn_refcount = 1; 487 488 if (mqfs_add_node(parent, dir) != 0) { 489 mqnode_free(dir); 490 return (-1); 491 } 492 493 return (0); 494 } 495 496 #ifdef notyet 497 498 /* 499 * Create a directory 500 */ 501 static struct mqfs_node * 502 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen, 503 struct ucred *cred, int mode) 504 { 505 struct mqfs_node *node; 506 507 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir); 508 if (mqfs_add_node(parent, node) != 0) { 509 mqnode_free(node); 510 return (NULL); 511 } 512 513 if (mqfs_fixup_dir(node) != 0) { 514 mqfs_destroy(node); 515 return (NULL); 516 } 517 return (node); 518 } 519 520 /* 521 * Create a symlink 522 */ 523 static struct mqfs_node * 524 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen, 525 struct ucred *cred, int mode) 526 { 527 struct mqfs_node *node; 528 529 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink); 530 if (mqfs_add_node(parent, node) != 0) { 531 mqnode_free(node); 532 return (NULL); 533 } 534 return (node); 535 } 536 537 #endif 538 539 /* 540 * Destroy a node or a tree of nodes 541 */ 542 static int 543 mqfs_destroy(struct mqfs_node *node) 544 { 545 struct mqfs_node *parent; 546 547 KASSERT(node != NULL, 548 ("%s(): node is NULL", __func__)); 549 KASSERT(node->mn_info != NULL, 550 ("%s(): node has no mn_info", __func__)); 551 552 /* destroy children */ 553 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root) 554 while (! LIST_EMPTY(&node->mn_children)) 555 mqfs_destroy(LIST_FIRST(&node->mn_children)); 556 557 /* unlink from parent */ 558 if ((parent = node->mn_parent) != NULL) { 559 KASSERT(parent->mn_info == node->mn_info, 560 ("%s(): parent has different mn_info", __func__)); 561 LIST_REMOVE(node, mn_sibling); 562 } 563 564 if (node->mn_fileno != 0) 565 mqfs_fileno_free(node->mn_info, node); 566 if (node->mn_data != NULL) 567 mqueue_free(node->mn_data); 568 mqnode_free(node); 569 return (0); 570 } 571 572 /* 573 * Mount a mqfs instance 574 */ 575 static int 576 mqfs_mount(struct mount *mp) 577 { 578 struct statfs *sbp; 579 580 if (mp->mnt_flag & MNT_UPDATE) 581 return (EOPNOTSUPP); 582 583 mp->mnt_data = &mqfs_data; 584 MNT_ILOCK(mp); 585 mp->mnt_flag |= MNT_LOCAL; 586 MNT_IUNLOCK(mp); 587 vfs_getnewfsid(mp); 588 589 sbp = &mp->mnt_stat; 590 vfs_mountedfrom(mp, "mqueue"); 591 sbp->f_bsize = PAGE_SIZE; 592 sbp->f_iosize = PAGE_SIZE; 593 sbp->f_blocks = 1; 594 sbp->f_bfree = 0; 595 sbp->f_bavail = 0; 596 sbp->f_files = 1; 597 sbp->f_ffree = 0; 598 return (0); 599 } 600 601 /* 602 * Unmount a mqfs instance 603 */ 604 static int 605 mqfs_unmount(struct mount *mp, int mntflags) 606 { 607 int error; 608 609 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0, 610 curthread); 611 return (error); 612 } 613 614 /* 615 * Return a root vnode 616 */ 617 static int 618 mqfs_root(struct mount *mp, int flags, struct vnode **vpp) 619 { 620 struct mqfs_info *mqfs; 621 int ret; 622 623 mqfs = VFSTOMQFS(mp); 624 ret = mqfs_allocv(mp, vpp, mqfs->mi_root); 625 return (ret); 626 } 627 628 /* 629 * Return filesystem stats 630 */ 631 static int 632 mqfs_statfs(struct mount *mp, struct statfs *sbp) 633 { 634 /* XXX update statistics */ 635 return (0); 636 } 637 638 /* 639 * Initialize a mqfs instance 640 */ 641 static int 642 mqfs_init(struct vfsconf *vfc) 643 { 644 struct mqfs_node *root; 645 struct mqfs_info *mi; 646 647 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node), 648 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 649 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue), 650 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 651 mvdata_zone = uma_zcreate("mvdata", 652 sizeof(struct mqfs_vdata), NULL, NULL, NULL, 653 NULL, UMA_ALIGN_PTR, 0); 654 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier), 655 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 656 mi = &mqfs_data; 657 sx_init(&mi->mi_lock, "mqfs lock"); 658 /* set up the root diretory */ 659 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777, 660 mqfstype_root); 661 root->mn_info = mi; 662 LIST_INIT(&root->mn_children); 663 LIST_INIT(&root->mn_vnodes); 664 mi->mi_root = root; 665 mqfs_fileno_init(mi); 666 mqfs_fileno_alloc(mi, root); 667 mqfs_fixup_dir(root); 668 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL, 669 EVENTHANDLER_PRI_ANY); 670 mq_fdclose = mqueue_fdclose; 671 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); 672 return (0); 673 } 674 675 /* 676 * Destroy a mqfs instance 677 */ 678 static int 679 mqfs_uninit(struct vfsconf *vfc) 680 { 681 struct mqfs_info *mi; 682 683 if (!unloadable) 684 return (EOPNOTSUPP); 685 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 686 mi = &mqfs_data; 687 mqfs_destroy(mi->mi_root); 688 mi->mi_root = NULL; 689 mqfs_fileno_uninit(mi); 690 sx_destroy(&mi->mi_lock); 691 uma_zdestroy(mqnode_zone); 692 uma_zdestroy(mqueue_zone); 693 uma_zdestroy(mvdata_zone); 694 uma_zdestroy(mqnoti_zone); 695 return (0); 696 } 697 698 /* 699 * task routine 700 */ 701 static void 702 do_recycle(void *context, int pending __unused) 703 { 704 struct vnode *vp = (struct vnode *)context; 705 706 vrecycle(vp); 707 vdrop(vp); 708 } 709 710 /* 711 * Allocate a vnode 712 */ 713 static int 714 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn) 715 { 716 struct mqfs_vdata *vd; 717 struct mqfs_info *mqfs; 718 struct vnode *newvpp; 719 int error; 720 721 mqfs = pn->mn_info; 722 *vpp = NULL; 723 sx_xlock(&mqfs->mi_lock); 724 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 725 if (vd->mv_vnode->v_mount == mp) { 726 vhold(vd->mv_vnode); 727 break; 728 } 729 } 730 731 if (vd != NULL) { 732 found: 733 *vpp = vd->mv_vnode; 734 sx_xunlock(&mqfs->mi_lock); 735 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread); 736 vdrop(*vpp); 737 return (error); 738 } 739 sx_xunlock(&mqfs->mi_lock); 740 741 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp); 742 if (error) 743 return (error); 744 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY); 745 error = insmntque(newvpp, mp); 746 if (error != 0) 747 return (error); 748 749 sx_xlock(&mqfs->mi_lock); 750 /* 751 * Check if it has already been allocated 752 * while we were blocked. 753 */ 754 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 755 if (vd->mv_vnode->v_mount == mp) { 756 vhold(vd->mv_vnode); 757 sx_xunlock(&mqfs->mi_lock); 758 759 vgone(newvpp); 760 vput(newvpp); 761 goto found; 762 } 763 } 764 765 *vpp = newvpp; 766 767 vd = uma_zalloc(mvdata_zone, M_WAITOK); 768 (*vpp)->v_data = vd; 769 vd->mv_vnode = *vpp; 770 vd->mv_node = pn; 771 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp); 772 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link); 773 mqnode_addref(pn); 774 switch (pn->mn_type) { 775 case mqfstype_root: 776 (*vpp)->v_vflag = VV_ROOT; 777 /* fall through */ 778 case mqfstype_dir: 779 case mqfstype_this: 780 case mqfstype_parent: 781 (*vpp)->v_type = VDIR; 782 break; 783 case mqfstype_file: 784 (*vpp)->v_type = VREG; 785 break; 786 case mqfstype_symlink: 787 (*vpp)->v_type = VLNK; 788 break; 789 case mqfstype_none: 790 KASSERT(0, ("mqfs_allocf called for null node\n")); 791 default: 792 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type); 793 } 794 sx_xunlock(&mqfs->mi_lock); 795 return (0); 796 } 797 798 /* 799 * Search a directory entry 800 */ 801 static struct mqfs_node * 802 mqfs_search(struct mqfs_node *pd, const char *name, int len) 803 { 804 struct mqfs_node *pn; 805 806 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED); 807 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 808 if (strncmp(pn->mn_name, name, len) == 0 && 809 pn->mn_name[len] == '\0') 810 return (pn); 811 } 812 return (NULL); 813 } 814 815 /* 816 * Look up a file or directory. 817 */ 818 static int 819 mqfs_lookupx(struct vop_cachedlookup_args *ap) 820 { 821 struct componentname *cnp; 822 struct vnode *dvp, **vpp; 823 struct mqfs_node *pd; 824 struct mqfs_node *pn; 825 struct mqfs_info *mqfs; 826 int nameiop, flags, error, namelen; 827 char *pname; 828 struct thread *td; 829 830 cnp = ap->a_cnp; 831 vpp = ap->a_vpp; 832 dvp = ap->a_dvp; 833 pname = cnp->cn_nameptr; 834 namelen = cnp->cn_namelen; 835 td = cnp->cn_thread; 836 flags = cnp->cn_flags; 837 nameiop = cnp->cn_nameiop; 838 pd = VTON(dvp); 839 pn = NULL; 840 mqfs = pd->mn_info; 841 *vpp = NULLVP; 842 843 if (dvp->v_type != VDIR) 844 return (ENOTDIR); 845 846 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 847 if (error) 848 return (error); 849 850 /* shortcut: check if the name is too long */ 851 if (cnp->cn_namelen >= MQFS_NAMELEN) 852 return (ENOENT); 853 854 /* self */ 855 if (namelen == 1 && pname[0] == '.') { 856 if ((flags & ISLASTCN) && nameiop != LOOKUP) 857 return (EINVAL); 858 pn = pd; 859 *vpp = dvp; 860 VREF(dvp); 861 return (0); 862 } 863 864 /* parent */ 865 if (cnp->cn_flags & ISDOTDOT) { 866 if (dvp->v_vflag & VV_ROOT) 867 return (EIO); 868 if ((flags & ISLASTCN) && nameiop != LOOKUP) 869 return (EINVAL); 870 VOP_UNLOCK(dvp, 0); 871 KASSERT(pd->mn_parent, ("non-root directory has no parent")); 872 pn = pd->mn_parent; 873 error = mqfs_allocv(dvp->v_mount, vpp, pn); 874 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 875 return (error); 876 } 877 878 /* named node */ 879 sx_xlock(&mqfs->mi_lock); 880 pn = mqfs_search(pd, pname, namelen); 881 if (pn != NULL) 882 mqnode_addref(pn); 883 sx_xunlock(&mqfs->mi_lock); 884 885 /* found */ 886 if (pn != NULL) { 887 /* DELETE */ 888 if (nameiop == DELETE && (flags & ISLASTCN)) { 889 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 890 if (error) { 891 mqnode_release(pn); 892 return (error); 893 } 894 if (*vpp == dvp) { 895 VREF(dvp); 896 *vpp = dvp; 897 mqnode_release(pn); 898 return (0); 899 } 900 } 901 902 /* allocate vnode */ 903 error = mqfs_allocv(dvp->v_mount, vpp, pn); 904 mqnode_release(pn); 905 if (error == 0 && cnp->cn_flags & MAKEENTRY) 906 cache_enter(dvp, *vpp, cnp); 907 return (error); 908 } 909 910 /* not found */ 911 912 /* will create a new entry in the directory ? */ 913 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT) 914 && (flags & ISLASTCN)) { 915 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 916 if (error) 917 return (error); 918 cnp->cn_flags |= SAVENAME; 919 return (EJUSTRETURN); 920 } 921 return (ENOENT); 922 } 923 924 #if 0 925 struct vop_lookup_args { 926 struct vop_generic_args a_gen; 927 struct vnode *a_dvp; 928 struct vnode **a_vpp; 929 struct componentname *a_cnp; 930 }; 931 #endif 932 933 /* 934 * vnode lookup operation 935 */ 936 static int 937 mqfs_lookup(struct vop_cachedlookup_args *ap) 938 { 939 int rc; 940 941 rc = mqfs_lookupx(ap); 942 return (rc); 943 } 944 945 #if 0 946 struct vop_create_args { 947 struct vnode *a_dvp; 948 struct vnode **a_vpp; 949 struct componentname *a_cnp; 950 struct vattr *a_vap; 951 }; 952 #endif 953 954 /* 955 * vnode creation operation 956 */ 957 static int 958 mqfs_create(struct vop_create_args *ap) 959 { 960 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 961 struct componentname *cnp = ap->a_cnp; 962 struct mqfs_node *pd; 963 struct mqfs_node *pn; 964 struct mqueue *mq; 965 int error; 966 967 pd = VTON(ap->a_dvp); 968 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 969 return (ENOTDIR); 970 mq = mqueue_alloc(NULL); 971 if (mq == NULL) 972 return (EAGAIN); 973 sx_xlock(&mqfs->mi_lock); 974 if ((cnp->cn_flags & HASBUF) == 0) 975 panic("%s: no name", __func__); 976 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen, 977 cnp->cn_cred, ap->a_vap->va_mode); 978 if (pn == NULL) { 979 sx_xunlock(&mqfs->mi_lock); 980 error = ENOSPC; 981 } else { 982 mqnode_addref(pn); 983 sx_xunlock(&mqfs->mi_lock); 984 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 985 mqnode_release(pn); 986 if (error) 987 mqfs_destroy(pn); 988 else 989 pn->mn_data = mq; 990 } 991 if (error) 992 mqueue_free(mq); 993 return (error); 994 } 995 996 /* 997 * Remove an entry 998 */ 999 static 1000 int do_unlink(struct mqfs_node *pn, struct ucred *ucred) 1001 { 1002 struct mqfs_node *parent; 1003 struct mqfs_vdata *vd; 1004 int error = 0; 1005 1006 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED); 1007 1008 if (ucred->cr_uid != pn->mn_uid && 1009 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0) 1010 error = EACCES; 1011 else if (!pn->mn_deleted) { 1012 parent = pn->mn_parent; 1013 pn->mn_parent = NULL; 1014 pn->mn_deleted = 1; 1015 LIST_REMOVE(pn, mn_sibling); 1016 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 1017 cache_purge(vd->mv_vnode); 1018 vhold(vd->mv_vnode); 1019 taskqueue_enqueue(taskqueue_thread, &vd->mv_task); 1020 } 1021 mqnode_release(pn); 1022 mqnode_release(parent); 1023 } else 1024 error = ENOENT; 1025 return (error); 1026 } 1027 1028 #if 0 1029 struct vop_remove_args { 1030 struct vnode *a_dvp; 1031 struct vnode *a_vp; 1032 struct componentname *a_cnp; 1033 }; 1034 #endif 1035 1036 /* 1037 * vnode removal operation 1038 */ 1039 static int 1040 mqfs_remove(struct vop_remove_args *ap) 1041 { 1042 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1043 struct mqfs_node *pn; 1044 int error; 1045 1046 if (ap->a_vp->v_type == VDIR) 1047 return (EPERM); 1048 pn = VTON(ap->a_vp); 1049 sx_xlock(&mqfs->mi_lock); 1050 error = do_unlink(pn, ap->a_cnp->cn_cred); 1051 sx_xunlock(&mqfs->mi_lock); 1052 return (error); 1053 } 1054 1055 #if 0 1056 struct vop_inactive_args { 1057 struct vnode *a_vp; 1058 struct thread *a_td; 1059 }; 1060 #endif 1061 1062 static int 1063 mqfs_inactive(struct vop_inactive_args *ap) 1064 { 1065 struct mqfs_node *pn = VTON(ap->a_vp); 1066 1067 if (pn->mn_deleted) 1068 vrecycle(ap->a_vp); 1069 return (0); 1070 } 1071 1072 #if 0 1073 struct vop_reclaim_args { 1074 struct vop_generic_args a_gen; 1075 struct vnode *a_vp; 1076 struct thread *a_td; 1077 }; 1078 #endif 1079 1080 static int 1081 mqfs_reclaim(struct vop_reclaim_args *ap) 1082 { 1083 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount); 1084 struct vnode *vp = ap->a_vp; 1085 struct mqfs_node *pn; 1086 struct mqfs_vdata *vd; 1087 1088 vd = vp->v_data; 1089 pn = vd->mv_node; 1090 sx_xlock(&mqfs->mi_lock); 1091 vp->v_data = NULL; 1092 LIST_REMOVE(vd, mv_link); 1093 uma_zfree(mvdata_zone, vd); 1094 mqnode_release(pn); 1095 sx_xunlock(&mqfs->mi_lock); 1096 return (0); 1097 } 1098 1099 #if 0 1100 struct vop_open_args { 1101 struct vop_generic_args a_gen; 1102 struct vnode *a_vp; 1103 int a_mode; 1104 struct ucred *a_cred; 1105 struct thread *a_td; 1106 struct file *a_fp; 1107 }; 1108 #endif 1109 1110 static int 1111 mqfs_open(struct vop_open_args *ap) 1112 { 1113 return (0); 1114 } 1115 1116 #if 0 1117 struct vop_close_args { 1118 struct vop_generic_args a_gen; 1119 struct vnode *a_vp; 1120 int a_fflag; 1121 struct ucred *a_cred; 1122 struct thread *a_td; 1123 }; 1124 #endif 1125 1126 static int 1127 mqfs_close(struct vop_close_args *ap) 1128 { 1129 return (0); 1130 } 1131 1132 #if 0 1133 struct vop_access_args { 1134 struct vop_generic_args a_gen; 1135 struct vnode *a_vp; 1136 accmode_t a_accmode; 1137 struct ucred *a_cred; 1138 struct thread *a_td; 1139 }; 1140 #endif 1141 1142 /* 1143 * Verify permissions 1144 */ 1145 static int 1146 mqfs_access(struct vop_access_args *ap) 1147 { 1148 struct vnode *vp = ap->a_vp; 1149 struct vattr vattr; 1150 int error; 1151 1152 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 1153 if (error) 1154 return (error); 1155 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid, 1156 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL); 1157 return (error); 1158 } 1159 1160 #if 0 1161 struct vop_getattr_args { 1162 struct vop_generic_args a_gen; 1163 struct vnode *a_vp; 1164 struct vattr *a_vap; 1165 struct ucred *a_cred; 1166 }; 1167 #endif 1168 1169 /* 1170 * Get file attributes 1171 */ 1172 static int 1173 mqfs_getattr(struct vop_getattr_args *ap) 1174 { 1175 struct vnode *vp = ap->a_vp; 1176 struct mqfs_node *pn = VTON(vp); 1177 struct vattr *vap = ap->a_vap; 1178 int error = 0; 1179 1180 vap->va_type = vp->v_type; 1181 vap->va_mode = pn->mn_mode; 1182 vap->va_nlink = 1; 1183 vap->va_uid = pn->mn_uid; 1184 vap->va_gid = pn->mn_gid; 1185 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 1186 vap->va_fileid = pn->mn_fileno; 1187 vap->va_size = 0; 1188 vap->va_blocksize = PAGE_SIZE; 1189 vap->va_bytes = vap->va_size = 0; 1190 vap->va_atime = pn->mn_atime; 1191 vap->va_mtime = pn->mn_mtime; 1192 vap->va_ctime = pn->mn_ctime; 1193 vap->va_birthtime = pn->mn_birth; 1194 vap->va_gen = 0; 1195 vap->va_flags = 0; 1196 vap->va_rdev = NODEV; 1197 vap->va_bytes = 0; 1198 vap->va_filerev = 0; 1199 return (error); 1200 } 1201 1202 #if 0 1203 struct vop_setattr_args { 1204 struct vop_generic_args a_gen; 1205 struct vnode *a_vp; 1206 struct vattr *a_vap; 1207 struct ucred *a_cred; 1208 }; 1209 #endif 1210 /* 1211 * Set attributes 1212 */ 1213 static int 1214 mqfs_setattr(struct vop_setattr_args *ap) 1215 { 1216 struct mqfs_node *pn; 1217 struct vattr *vap; 1218 struct vnode *vp; 1219 struct thread *td; 1220 int c, error; 1221 uid_t uid; 1222 gid_t gid; 1223 1224 td = curthread; 1225 vap = ap->a_vap; 1226 vp = ap->a_vp; 1227 if ((vap->va_type != VNON) || 1228 (vap->va_nlink != VNOVAL) || 1229 (vap->va_fsid != VNOVAL) || 1230 (vap->va_fileid != VNOVAL) || 1231 (vap->va_blocksize != VNOVAL) || 1232 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1233 (vap->va_rdev != VNOVAL) || 1234 ((int)vap->va_bytes != VNOVAL) || 1235 (vap->va_gen != VNOVAL)) { 1236 return (EINVAL); 1237 } 1238 1239 pn = VTON(vp); 1240 1241 error = c = 0; 1242 if (vap->va_uid == (uid_t)VNOVAL) 1243 uid = pn->mn_uid; 1244 else 1245 uid = vap->va_uid; 1246 if (vap->va_gid == (gid_t)VNOVAL) 1247 gid = pn->mn_gid; 1248 else 1249 gid = vap->va_gid; 1250 1251 if (uid != pn->mn_uid || gid != pn->mn_gid) { 1252 /* 1253 * To modify the ownership of a file, must possess VADMIN 1254 * for that file. 1255 */ 1256 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td))) 1257 return (error); 1258 1259 /* 1260 * XXXRW: Why is there a privilege check here: shouldn't the 1261 * check in VOP_ACCESS() be enough? Also, are the group bits 1262 * below definitely right? 1263 */ 1264 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid || 1265 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) && 1266 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0) 1267 return (error); 1268 pn->mn_uid = uid; 1269 pn->mn_gid = gid; 1270 c = 1; 1271 } 1272 1273 if (vap->va_mode != (mode_t)VNOVAL) { 1274 if ((ap->a_cred->cr_uid != pn->mn_uid) && 1275 (error = priv_check(td, PRIV_MQ_ADMIN))) 1276 return (error); 1277 pn->mn_mode = vap->va_mode; 1278 c = 1; 1279 } 1280 1281 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1282 /* See the comment in ufs_vnops::ufs_setattr(). */ 1283 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) && 1284 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1285 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td)))) 1286 return (error); 1287 if (vap->va_atime.tv_sec != VNOVAL) { 1288 pn->mn_atime = vap->va_atime; 1289 } 1290 if (vap->va_mtime.tv_sec != VNOVAL) { 1291 pn->mn_mtime = vap->va_mtime; 1292 } 1293 c = 1; 1294 } 1295 if (c) { 1296 vfs_timestamp(&pn->mn_ctime); 1297 } 1298 return (0); 1299 } 1300 1301 #if 0 1302 struct vop_read_args { 1303 struct vop_generic_args a_gen; 1304 struct vnode *a_vp; 1305 struct uio *a_uio; 1306 int a_ioflag; 1307 struct ucred *a_cred; 1308 }; 1309 #endif 1310 1311 /* 1312 * Read from a file 1313 */ 1314 static int 1315 mqfs_read(struct vop_read_args *ap) 1316 { 1317 char buf[80]; 1318 struct vnode *vp = ap->a_vp; 1319 struct uio *uio = ap->a_uio; 1320 struct mqfs_node *pn; 1321 struct mqueue *mq; 1322 int len, error; 1323 1324 if (vp->v_type != VREG) 1325 return (EINVAL); 1326 1327 pn = VTON(vp); 1328 mq = VTOMQ(vp); 1329 snprintf(buf, sizeof(buf), 1330 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n", 1331 mq->mq_totalbytes, 1332 mq->mq_maxmsg, 1333 mq->mq_curmsgs, 1334 mq->mq_msgsize); 1335 buf[sizeof(buf)-1] = '\0'; 1336 len = strlen(buf); 1337 error = uiomove_frombuf(buf, len, uio); 1338 return (error); 1339 } 1340 1341 #if 0 1342 struct vop_readdir_args { 1343 struct vop_generic_args a_gen; 1344 struct vnode *a_vp; 1345 struct uio *a_uio; 1346 struct ucred *a_cred; 1347 int *a_eofflag; 1348 int *a_ncookies; 1349 u_long **a_cookies; 1350 }; 1351 #endif 1352 1353 /* 1354 * Return directory entries. 1355 */ 1356 static int 1357 mqfs_readdir(struct vop_readdir_args *ap) 1358 { 1359 struct vnode *vp; 1360 struct mqfs_info *mi; 1361 struct mqfs_node *pd; 1362 struct mqfs_node *pn; 1363 struct dirent entry; 1364 struct uio *uio; 1365 int *tmp_ncookies = NULL; 1366 off_t offset; 1367 int error, i; 1368 1369 vp = ap->a_vp; 1370 mi = VFSTOMQFS(vp->v_mount); 1371 pd = VTON(vp); 1372 uio = ap->a_uio; 1373 1374 if (vp->v_type != VDIR) 1375 return (ENOTDIR); 1376 1377 if (uio->uio_offset < 0) 1378 return (EINVAL); 1379 1380 if (ap->a_ncookies != NULL) { 1381 tmp_ncookies = ap->a_ncookies; 1382 *ap->a_ncookies = 0; 1383 ap->a_ncookies = NULL; 1384 } 1385 1386 error = 0; 1387 offset = 0; 1388 1389 sx_xlock(&mi->mi_lock); 1390 1391 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 1392 entry.d_reclen = sizeof(entry); 1393 if (!pn->mn_fileno) 1394 mqfs_fileno_alloc(mi, pn); 1395 entry.d_fileno = pn->mn_fileno; 1396 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i) 1397 entry.d_name[i] = pn->mn_name[i]; 1398 entry.d_name[i] = 0; 1399 entry.d_namlen = i; 1400 switch (pn->mn_type) { 1401 case mqfstype_root: 1402 case mqfstype_dir: 1403 case mqfstype_this: 1404 case mqfstype_parent: 1405 entry.d_type = DT_DIR; 1406 break; 1407 case mqfstype_file: 1408 entry.d_type = DT_REG; 1409 break; 1410 case mqfstype_symlink: 1411 entry.d_type = DT_LNK; 1412 break; 1413 default: 1414 panic("%s has unexpected node type: %d", pn->mn_name, 1415 pn->mn_type); 1416 } 1417 if (entry.d_reclen > uio->uio_resid) 1418 break; 1419 if (offset >= uio->uio_offset) { 1420 error = vfs_read_dirent(ap, &entry, offset); 1421 if (error) 1422 break; 1423 } 1424 offset += entry.d_reclen; 1425 } 1426 sx_xunlock(&mi->mi_lock); 1427 1428 uio->uio_offset = offset; 1429 1430 if (tmp_ncookies != NULL) 1431 ap->a_ncookies = tmp_ncookies; 1432 1433 return (error); 1434 } 1435 1436 #ifdef notyet 1437 1438 #if 0 1439 struct vop_mkdir_args { 1440 struct vnode *a_dvp; 1441 struvt vnode **a_vpp; 1442 struvt componentname *a_cnp; 1443 struct vattr *a_vap; 1444 }; 1445 #endif 1446 1447 /* 1448 * Create a directory. 1449 */ 1450 static int 1451 mqfs_mkdir(struct vop_mkdir_args *ap) 1452 { 1453 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1454 struct componentname *cnp = ap->a_cnp; 1455 struct mqfs_node *pd = VTON(ap->a_dvp); 1456 struct mqfs_node *pn; 1457 int error; 1458 1459 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 1460 return (ENOTDIR); 1461 sx_xlock(&mqfs->mi_lock); 1462 if ((cnp->cn_flags & HASBUF) == 0) 1463 panic("%s: no name", __func__); 1464 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen, 1465 ap->a_vap->cn_cred, ap->a_vap->va_mode); 1466 if (pn != NULL) 1467 mqnode_addref(pn); 1468 sx_xunlock(&mqfs->mi_lock); 1469 if (pn == NULL) { 1470 error = ENOSPC; 1471 } else { 1472 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1473 mqnode_release(pn); 1474 } 1475 return (error); 1476 } 1477 1478 #if 0 1479 struct vop_rmdir_args { 1480 struct vnode *a_dvp; 1481 struct vnode *a_vp; 1482 struct componentname *a_cnp; 1483 }; 1484 #endif 1485 1486 /* 1487 * Remove a directory. 1488 */ 1489 static int 1490 mqfs_rmdir(struct vop_rmdir_args *ap) 1491 { 1492 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1493 struct mqfs_node *pn = VTON(ap->a_vp); 1494 struct mqfs_node *pt; 1495 1496 if (pn->mn_type != mqfstype_dir) 1497 return (ENOTDIR); 1498 1499 sx_xlock(&mqfs->mi_lock); 1500 if (pn->mn_deleted) { 1501 sx_xunlock(&mqfs->mi_lock); 1502 return (ENOENT); 1503 } 1504 1505 pt = LIST_FIRST(&pn->mn_children); 1506 pt = LIST_NEXT(pt, mn_sibling); 1507 pt = LIST_NEXT(pt, mn_sibling); 1508 if (pt != NULL) { 1509 sx_xunlock(&mqfs->mi_lock); 1510 return (ENOTEMPTY); 1511 } 1512 pt = pn->mn_parent; 1513 pn->mn_parent = NULL; 1514 pn->mn_deleted = 1; 1515 LIST_REMOVE(pn, mn_sibling); 1516 mqnode_release(pn); 1517 mqnode_release(pt); 1518 sx_xunlock(&mqfs->mi_lock); 1519 cache_purge(ap->a_vp); 1520 return (0); 1521 } 1522 1523 #endif /* notyet */ 1524 1525 /* 1526 * Allocate a message queue 1527 */ 1528 static struct mqueue * 1529 mqueue_alloc(const struct mq_attr *attr) 1530 { 1531 struct mqueue *mq; 1532 1533 if (curmq >= maxmq) 1534 return (NULL); 1535 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO); 1536 TAILQ_INIT(&mq->mq_msgq); 1537 if (attr != NULL) { 1538 mq->mq_maxmsg = attr->mq_maxmsg; 1539 mq->mq_msgsize = attr->mq_msgsize; 1540 } else { 1541 mq->mq_maxmsg = default_maxmsg; 1542 mq->mq_msgsize = default_msgsize; 1543 } 1544 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF); 1545 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex); 1546 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex); 1547 atomic_add_int(&curmq, 1); 1548 return (mq); 1549 } 1550 1551 /* 1552 * Destroy a message queue 1553 */ 1554 static void 1555 mqueue_free(struct mqueue *mq) 1556 { 1557 struct mqueue_msg *msg; 1558 1559 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) { 1560 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link); 1561 free(msg, M_MQUEUEDATA); 1562 } 1563 1564 mtx_destroy(&mq->mq_mutex); 1565 seldrain(&mq->mq_rsel); 1566 seldrain(&mq->mq_wsel); 1567 knlist_destroy(&mq->mq_rsel.si_note); 1568 knlist_destroy(&mq->mq_wsel.si_note); 1569 uma_zfree(mqueue_zone, mq); 1570 atomic_add_int(&curmq, -1); 1571 } 1572 1573 /* 1574 * Load a message from user space 1575 */ 1576 static struct mqueue_msg * 1577 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio) 1578 { 1579 struct mqueue_msg *msg; 1580 size_t len; 1581 int error; 1582 1583 len = sizeof(struct mqueue_msg) + msg_size; 1584 msg = malloc(len, M_MQUEUEDATA, M_WAITOK); 1585 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg), 1586 msg_size); 1587 if (error) { 1588 free(msg, M_MQUEUEDATA); 1589 msg = NULL; 1590 } else { 1591 msg->msg_size = msg_size; 1592 msg->msg_prio = msg_prio; 1593 } 1594 return (msg); 1595 } 1596 1597 /* 1598 * Save a message to user space 1599 */ 1600 static int 1601 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio) 1602 { 1603 int error; 1604 1605 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr, 1606 msg->msg_size); 1607 if (error == 0 && msg_prio != NULL) 1608 error = copyout(&msg->msg_prio, msg_prio, sizeof(int)); 1609 return (error); 1610 } 1611 1612 /* 1613 * Free a message's memory 1614 */ 1615 static __inline void 1616 mqueue_freemsg(struct mqueue_msg *msg) 1617 { 1618 free(msg, M_MQUEUEDATA); 1619 } 1620 1621 /* 1622 * Send a message. if waitok is false, thread will not be 1623 * blocked if there is no data in queue, otherwise, absolute 1624 * time will be checked. 1625 */ 1626 int 1627 mqueue_send(struct mqueue *mq, const char *msg_ptr, 1628 size_t msg_len, unsigned msg_prio, int waitok, 1629 const struct timespec *abs_timeout) 1630 { 1631 struct mqueue_msg *msg; 1632 struct timespec ts, ts2; 1633 struct timeval tv; 1634 int error; 1635 1636 if (msg_prio >= MQ_PRIO_MAX) 1637 return (EINVAL); 1638 if (msg_len > mq->mq_msgsize) 1639 return (EMSGSIZE); 1640 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio); 1641 if (msg == NULL) 1642 return (EFAULT); 1643 1644 /* O_NONBLOCK case */ 1645 if (!waitok) { 1646 error = _mqueue_send(mq, msg, -1); 1647 if (error) 1648 goto bad; 1649 return (0); 1650 } 1651 1652 /* we allow a null timeout (wait forever) */ 1653 if (abs_timeout == NULL) { 1654 error = _mqueue_send(mq, msg, 0); 1655 if (error) 1656 goto bad; 1657 return (0); 1658 } 1659 1660 /* send it before checking time */ 1661 error = _mqueue_send(mq, msg, -1); 1662 if (error == 0) 1663 return (0); 1664 1665 if (error != EAGAIN) 1666 goto bad; 1667 1668 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1669 error = EINVAL; 1670 goto bad; 1671 } 1672 for (;;) { 1673 ts2 = *abs_timeout; 1674 getnanotime(&ts); 1675 timespecsub(&ts2, &ts); 1676 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1677 error = ETIMEDOUT; 1678 break; 1679 } 1680 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1681 error = _mqueue_send(mq, msg, tvtohz(&tv)); 1682 if (error != ETIMEDOUT) 1683 break; 1684 } 1685 if (error == 0) 1686 return (0); 1687 bad: 1688 mqueue_freemsg(msg); 1689 return (error); 1690 } 1691 1692 /* 1693 * Common routine to send a message 1694 */ 1695 static int 1696 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo) 1697 { 1698 struct mqueue_msg *msg2; 1699 int error = 0; 1700 1701 mtx_lock(&mq->mq_mutex); 1702 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) { 1703 if (timo < 0) { 1704 mtx_unlock(&mq->mq_mutex); 1705 return (EAGAIN); 1706 } 1707 mq->mq_senders++; 1708 error = msleep(&mq->mq_senders, &mq->mq_mutex, 1709 PCATCH, "mqsend", timo); 1710 mq->mq_senders--; 1711 if (error == EAGAIN) 1712 error = ETIMEDOUT; 1713 } 1714 if (mq->mq_curmsgs >= mq->mq_maxmsg) { 1715 mtx_unlock(&mq->mq_mutex); 1716 return (error); 1717 } 1718 error = 0; 1719 if (TAILQ_EMPTY(&mq->mq_msgq)) { 1720 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link); 1721 } else { 1722 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) { 1723 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link); 1724 } else { 1725 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) { 1726 if (msg2->msg_prio < msg->msg_prio) 1727 break; 1728 } 1729 TAILQ_INSERT_BEFORE(msg2, msg, msg_link); 1730 } 1731 } 1732 mq->mq_curmsgs++; 1733 mq->mq_totalbytes += msg->msg_size; 1734 if (mq->mq_receivers) 1735 wakeup_one(&mq->mq_receivers); 1736 else if (mq->mq_notifier != NULL) 1737 mqueue_send_notification(mq); 1738 if (mq->mq_flags & MQ_RSEL) { 1739 mq->mq_flags &= ~MQ_RSEL; 1740 selwakeup(&mq->mq_rsel); 1741 } 1742 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0); 1743 mtx_unlock(&mq->mq_mutex); 1744 return (0); 1745 } 1746 1747 /* 1748 * Send realtime a signal to process which registered itself 1749 * successfully by mq_notify. 1750 */ 1751 static void 1752 mqueue_send_notification(struct mqueue *mq) 1753 { 1754 struct mqueue_notifier *nt; 1755 struct thread *td; 1756 struct proc *p; 1757 int error; 1758 1759 mtx_assert(&mq->mq_mutex, MA_OWNED); 1760 nt = mq->mq_notifier; 1761 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) { 1762 p = nt->nt_proc; 1763 error = sigev_findtd(p, &nt->nt_sigev, &td); 1764 if (error) { 1765 mq->mq_notifier = NULL; 1766 return; 1767 } 1768 if (!KSI_ONQ(&nt->nt_ksi)) { 1769 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev); 1770 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi); 1771 } 1772 PROC_UNLOCK(p); 1773 } 1774 mq->mq_notifier = NULL; 1775 } 1776 1777 /* 1778 * Get a message. if waitok is false, thread will not be 1779 * blocked if there is no data in queue, otherwise, absolute 1780 * time will be checked. 1781 */ 1782 int 1783 mqueue_receive(struct mqueue *mq, char *msg_ptr, 1784 size_t msg_len, unsigned *msg_prio, int waitok, 1785 const struct timespec *abs_timeout) 1786 { 1787 struct mqueue_msg *msg; 1788 struct timespec ts, ts2; 1789 struct timeval tv; 1790 int error; 1791 1792 if (msg_len < mq->mq_msgsize) 1793 return (EMSGSIZE); 1794 1795 /* O_NONBLOCK case */ 1796 if (!waitok) { 1797 error = _mqueue_recv(mq, &msg, -1); 1798 if (error) 1799 return (error); 1800 goto received; 1801 } 1802 1803 /* we allow a null timeout (wait forever). */ 1804 if (abs_timeout == NULL) { 1805 error = _mqueue_recv(mq, &msg, 0); 1806 if (error) 1807 return (error); 1808 goto received; 1809 } 1810 1811 /* try to get a message before checking time */ 1812 error = _mqueue_recv(mq, &msg, -1); 1813 if (error == 0) 1814 goto received; 1815 1816 if (error != EAGAIN) 1817 return (error); 1818 1819 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1820 error = EINVAL; 1821 return (error); 1822 } 1823 1824 for (;;) { 1825 ts2 = *abs_timeout; 1826 getnanotime(&ts); 1827 timespecsub(&ts2, &ts); 1828 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1829 error = ETIMEDOUT; 1830 return (error); 1831 } 1832 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1833 error = _mqueue_recv(mq, &msg, tvtohz(&tv)); 1834 if (error == 0) 1835 break; 1836 if (error != ETIMEDOUT) 1837 return (error); 1838 } 1839 1840 received: 1841 error = mqueue_savemsg(msg, msg_ptr, msg_prio); 1842 if (error == 0) { 1843 curthread->td_retval[0] = msg->msg_size; 1844 curthread->td_retval[1] = 0; 1845 } 1846 mqueue_freemsg(msg); 1847 return (error); 1848 } 1849 1850 /* 1851 * Common routine to receive a message 1852 */ 1853 static int 1854 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo) 1855 { 1856 int error = 0; 1857 1858 mtx_lock(&mq->mq_mutex); 1859 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) { 1860 if (timo < 0) { 1861 mtx_unlock(&mq->mq_mutex); 1862 return (EAGAIN); 1863 } 1864 mq->mq_receivers++; 1865 error = msleep(&mq->mq_receivers, &mq->mq_mutex, 1866 PCATCH, "mqrecv", timo); 1867 mq->mq_receivers--; 1868 if (error == EAGAIN) 1869 error = ETIMEDOUT; 1870 } 1871 if (*msg != NULL) { 1872 error = 0; 1873 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link); 1874 mq->mq_curmsgs--; 1875 mq->mq_totalbytes -= (*msg)->msg_size; 1876 if (mq->mq_senders) 1877 wakeup_one(&mq->mq_senders); 1878 if (mq->mq_flags & MQ_WSEL) { 1879 mq->mq_flags &= ~MQ_WSEL; 1880 selwakeup(&mq->mq_wsel); 1881 } 1882 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0); 1883 } 1884 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 && 1885 !TAILQ_EMPTY(&mq->mq_msgq)) { 1886 mqueue_send_notification(mq); 1887 } 1888 mtx_unlock(&mq->mq_mutex); 1889 return (error); 1890 } 1891 1892 static __inline struct mqueue_notifier * 1893 notifier_alloc(void) 1894 { 1895 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO)); 1896 } 1897 1898 static __inline void 1899 notifier_free(struct mqueue_notifier *p) 1900 { 1901 uma_zfree(mqnoti_zone, p); 1902 } 1903 1904 static struct mqueue_notifier * 1905 notifier_search(struct proc *p, int fd) 1906 { 1907 struct mqueue_notifier *nt; 1908 1909 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) { 1910 if (nt->nt_ksi.ksi_mqd == fd) 1911 break; 1912 } 1913 return (nt); 1914 } 1915 1916 static __inline void 1917 notifier_insert(struct proc *p, struct mqueue_notifier *nt) 1918 { 1919 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link); 1920 } 1921 1922 static __inline void 1923 notifier_delete(struct proc *p, struct mqueue_notifier *nt) 1924 { 1925 LIST_REMOVE(nt, nt_link); 1926 notifier_free(nt); 1927 } 1928 1929 static void 1930 notifier_remove(struct proc *p, struct mqueue *mq, int fd) 1931 { 1932 struct mqueue_notifier *nt; 1933 1934 mtx_assert(&mq->mq_mutex, MA_OWNED); 1935 PROC_LOCK(p); 1936 nt = notifier_search(p, fd); 1937 if (nt != NULL) { 1938 if (mq->mq_notifier == nt) 1939 mq->mq_notifier = NULL; 1940 sigqueue_take(&nt->nt_ksi); 1941 notifier_delete(p, nt); 1942 } 1943 PROC_UNLOCK(p); 1944 } 1945 1946 static int 1947 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode, 1948 const struct mq_attr *attr) 1949 { 1950 char path[MQFS_NAMELEN + 1]; 1951 struct mqfs_node *pn; 1952 struct filedesc *fdp; 1953 struct file *fp; 1954 struct mqueue *mq; 1955 int fd, error, len, cmode; 1956 1957 fdp = td->td_proc->p_fd; 1958 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT); 1959 mq = NULL; 1960 if ((flags & O_CREAT) != 0 && attr != NULL) { 1961 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg) 1962 return (EINVAL); 1963 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize) 1964 return (EINVAL); 1965 } 1966 1967 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL); 1968 if (error) 1969 return (error); 1970 1971 /* 1972 * The first character of name must be a slash (/) character 1973 * and the remaining characters of name cannot include any slash 1974 * characters. 1975 */ 1976 len = strlen(path); 1977 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 1978 return (EINVAL); 1979 1980 error = falloc(td, &fp, &fd, O_CLOEXEC); 1981 if (error) 1982 return (error); 1983 1984 sx_xlock(&mqfs_data.mi_lock); 1985 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1); 1986 if (pn == NULL) { 1987 if (!(flags & O_CREAT)) { 1988 error = ENOENT; 1989 } else { 1990 mq = mqueue_alloc(attr); 1991 if (mq == NULL) { 1992 error = ENFILE; 1993 } else { 1994 pn = mqfs_create_file(mqfs_data.mi_root, 1995 path + 1, len - 1, td->td_ucred, 1996 cmode); 1997 if (pn == NULL) { 1998 error = ENOSPC; 1999 mqueue_free(mq); 2000 } 2001 } 2002 } 2003 2004 if (error == 0) { 2005 pn->mn_data = mq; 2006 } 2007 } else { 2008 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) { 2009 error = EEXIST; 2010 } else { 2011 accmode_t accmode = 0; 2012 2013 if (flags & FREAD) 2014 accmode |= VREAD; 2015 if (flags & FWRITE) 2016 accmode |= VWRITE; 2017 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, 2018 pn->mn_gid, accmode, td->td_ucred, NULL); 2019 } 2020 } 2021 2022 if (error) { 2023 sx_xunlock(&mqfs_data.mi_lock); 2024 fdclose(fdp, fp, fd, td); 2025 fdrop(fp, td); 2026 return (error); 2027 } 2028 2029 mqnode_addref(pn); 2030 sx_xunlock(&mqfs_data.mi_lock); 2031 2032 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn, 2033 &mqueueops); 2034 2035 td->td_retval[0] = fd; 2036 fdrop(fp, td); 2037 return (0); 2038 } 2039 2040 /* 2041 * Syscall to open a message queue. 2042 */ 2043 int 2044 sys_kmq_open(struct thread *td, struct kmq_open_args *uap) 2045 { 2046 struct mq_attr attr; 2047 int flags, error; 2048 2049 if ((uap->flags & O_ACCMODE) == O_ACCMODE) 2050 return (EINVAL); 2051 flags = FFLAGS(uap->flags); 2052 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2053 error = copyin(uap->attr, &attr, sizeof(attr)); 2054 if (error) 2055 return (error); 2056 } 2057 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2058 uap->attr != NULL ? &attr : NULL)); 2059 } 2060 2061 /* 2062 * Syscall to unlink a message queue. 2063 */ 2064 int 2065 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap) 2066 { 2067 char path[MQFS_NAMELEN+1]; 2068 struct mqfs_node *pn; 2069 int error, len; 2070 2071 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL); 2072 if (error) 2073 return (error); 2074 2075 len = strlen(path); 2076 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 2077 return (EINVAL); 2078 2079 sx_xlock(&mqfs_data.mi_lock); 2080 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1); 2081 if (pn != NULL) 2082 error = do_unlink(pn, td->td_ucred); 2083 else 2084 error = ENOENT; 2085 sx_xunlock(&mqfs_data.mi_lock); 2086 return (error); 2087 } 2088 2089 typedef int (*_fgetf)(struct thread *, int, cap_rights_t, struct file **); 2090 2091 /* 2092 * Get message queue by giving file slot 2093 */ 2094 static int 2095 _getmq(struct thread *td, int fd, cap_rights_t rights, _fgetf func, 2096 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq) 2097 { 2098 struct mqfs_node *pn; 2099 int error; 2100 2101 error = func(td, fd, rights, fpp); 2102 if (error) 2103 return (error); 2104 if (&mqueueops != (*fpp)->f_ops) { 2105 fdrop(*fpp, td); 2106 return (EBADF); 2107 } 2108 pn = (*fpp)->f_data; 2109 if (ppn) 2110 *ppn = pn; 2111 if (pmq) 2112 *pmq = pn->mn_data; 2113 return (0); 2114 } 2115 2116 static __inline int 2117 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, 2118 struct mqueue **pmq) 2119 { 2120 return _getmq(td, fd, CAP_POLL_EVENT, fget, fpp, ppn, pmq); 2121 } 2122 2123 static __inline int 2124 getmq_read(struct thread *td, int fd, struct file **fpp, 2125 struct mqfs_node **ppn, struct mqueue **pmq) 2126 { 2127 return _getmq(td, fd, CAP_READ, fget_read, fpp, ppn, pmq); 2128 } 2129 2130 static __inline int 2131 getmq_write(struct thread *td, int fd, struct file **fpp, 2132 struct mqfs_node **ppn, struct mqueue **pmq) 2133 { 2134 return _getmq(td, fd, CAP_WRITE, fget_write, fpp, ppn, pmq); 2135 } 2136 2137 static int 2138 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr, 2139 struct mq_attr *oattr) 2140 { 2141 struct mqueue *mq; 2142 struct file *fp; 2143 u_int oflag, flag; 2144 int error; 2145 2146 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0) 2147 return (EINVAL); 2148 error = getmq(td, mqd, &fp, NULL, &mq); 2149 if (error) 2150 return (error); 2151 oattr->mq_maxmsg = mq->mq_maxmsg; 2152 oattr->mq_msgsize = mq->mq_msgsize; 2153 oattr->mq_curmsgs = mq->mq_curmsgs; 2154 if (attr != NULL) { 2155 do { 2156 oflag = flag = fp->f_flag; 2157 flag &= ~O_NONBLOCK; 2158 flag |= (attr->mq_flags & O_NONBLOCK); 2159 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0); 2160 } else 2161 oflag = fp->f_flag; 2162 oattr->mq_flags = (O_NONBLOCK & oflag); 2163 fdrop(fp, td); 2164 return (error); 2165 } 2166 2167 int 2168 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap) 2169 { 2170 struct mq_attr attr, oattr; 2171 int error; 2172 2173 if (uap->attr != NULL) { 2174 error = copyin(uap->attr, &attr, sizeof(attr)); 2175 if (error != 0) 2176 return (error); 2177 } 2178 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2179 &oattr); 2180 if (error != 0) 2181 return (error); 2182 if (uap->oattr != NULL) 2183 error = copyout(&oattr, uap->oattr, sizeof(oattr)); 2184 return (error); 2185 } 2186 2187 int 2188 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap) 2189 { 2190 struct mqueue *mq; 2191 struct file *fp; 2192 struct timespec *abs_timeout, ets; 2193 int error; 2194 int waitok; 2195 2196 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2197 if (error) 2198 return (error); 2199 if (uap->abs_timeout != NULL) { 2200 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2201 if (error != 0) 2202 return (error); 2203 abs_timeout = &ets; 2204 } else 2205 abs_timeout = NULL; 2206 waitok = !(fp->f_flag & O_NONBLOCK); 2207 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2208 uap->msg_prio, waitok, abs_timeout); 2209 fdrop(fp, td); 2210 return (error); 2211 } 2212 2213 int 2214 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap) 2215 { 2216 struct mqueue *mq; 2217 struct file *fp; 2218 struct timespec *abs_timeout, ets; 2219 int error, waitok; 2220 2221 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2222 if (error) 2223 return (error); 2224 if (uap->abs_timeout != NULL) { 2225 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2226 if (error != 0) 2227 return (error); 2228 abs_timeout = &ets; 2229 } else 2230 abs_timeout = NULL; 2231 waitok = !(fp->f_flag & O_NONBLOCK); 2232 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2233 uap->msg_prio, waitok, abs_timeout); 2234 fdrop(fp, td); 2235 return (error); 2236 } 2237 2238 int 2239 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap) 2240 { 2241 struct sigevent ev; 2242 struct filedesc *fdp; 2243 struct proc *p; 2244 struct mqueue *mq; 2245 struct file *fp, *fp2; 2246 struct mqueue_notifier *nt, *newnt = NULL; 2247 int error; 2248 2249 p = td->td_proc; 2250 fdp = td->td_proc->p_fd; 2251 if (uap->sigev) { 2252 error = copyin(uap->sigev, &ev, sizeof(ev)); 2253 if (error) 2254 return (error); 2255 if (ev.sigev_notify != SIGEV_SIGNAL && 2256 ev.sigev_notify != SIGEV_THREAD_ID && 2257 ev.sigev_notify != SIGEV_NONE) 2258 return (EINVAL); 2259 if ((ev.sigev_notify == SIGEV_SIGNAL || 2260 ev.sigev_notify == SIGEV_THREAD_ID) && 2261 !_SIG_VALID(ev.sigev_signo)) 2262 return (EINVAL); 2263 } 2264 error = getmq(td, uap->mqd, &fp, NULL, &mq); 2265 if (error) 2266 return (error); 2267 again: 2268 FILEDESC_SLOCK(fdp); 2269 fp2 = fget_locked(fdp, uap->mqd); 2270 if (fp2 == NULL) { 2271 FILEDESC_SUNLOCK(fdp); 2272 error = EBADF; 2273 goto out; 2274 } 2275 #ifdef CAPABILITIES 2276 error = cap_check(cap_rights(fdp, uap->mqd), CAP_POLL_EVENT); 2277 if (error) { 2278 FILEDESC_SUNLOCK(fdp); 2279 goto out; 2280 } 2281 #endif 2282 if (fp2 != fp) { 2283 FILEDESC_SUNLOCK(fdp); 2284 error = EBADF; 2285 goto out; 2286 } 2287 mtx_lock(&mq->mq_mutex); 2288 FILEDESC_SUNLOCK(fdp); 2289 if (uap->sigev != NULL) { 2290 if (mq->mq_notifier != NULL) { 2291 error = EBUSY; 2292 } else { 2293 PROC_LOCK(p); 2294 nt = notifier_search(p, uap->mqd); 2295 if (nt == NULL) { 2296 if (newnt == NULL) { 2297 PROC_UNLOCK(p); 2298 mtx_unlock(&mq->mq_mutex); 2299 newnt = notifier_alloc(); 2300 goto again; 2301 } 2302 } 2303 2304 if (nt != NULL) { 2305 sigqueue_take(&nt->nt_ksi); 2306 if (newnt != NULL) { 2307 notifier_free(newnt); 2308 newnt = NULL; 2309 } 2310 } else { 2311 nt = newnt; 2312 newnt = NULL; 2313 ksiginfo_init(&nt->nt_ksi); 2314 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT; 2315 nt->nt_ksi.ksi_code = SI_MESGQ; 2316 nt->nt_proc = p; 2317 nt->nt_ksi.ksi_mqd = uap->mqd; 2318 notifier_insert(p, nt); 2319 } 2320 nt->nt_sigev = ev; 2321 mq->mq_notifier = nt; 2322 PROC_UNLOCK(p); 2323 /* 2324 * if there is no receivers and message queue 2325 * is not empty, we should send notification 2326 * as soon as possible. 2327 */ 2328 if (mq->mq_receivers == 0 && 2329 !TAILQ_EMPTY(&mq->mq_msgq)) 2330 mqueue_send_notification(mq); 2331 } 2332 } else { 2333 notifier_remove(p, mq, uap->mqd); 2334 } 2335 mtx_unlock(&mq->mq_mutex); 2336 2337 out: 2338 fdrop(fp, td); 2339 if (newnt != NULL) 2340 notifier_free(newnt); 2341 return (error); 2342 } 2343 2344 static void 2345 mqueue_fdclose(struct thread *td, int fd, struct file *fp) 2346 { 2347 struct filedesc *fdp; 2348 struct mqueue *mq; 2349 2350 fdp = td->td_proc->p_fd; 2351 FILEDESC_LOCK_ASSERT(fdp); 2352 2353 if (fp->f_ops == &mqueueops) { 2354 mq = FPTOMQ(fp); 2355 mtx_lock(&mq->mq_mutex); 2356 notifier_remove(td->td_proc, mq, fd); 2357 2358 /* have to wakeup thread in same process */ 2359 if (mq->mq_flags & MQ_RSEL) { 2360 mq->mq_flags &= ~MQ_RSEL; 2361 selwakeup(&mq->mq_rsel); 2362 } 2363 if (mq->mq_flags & MQ_WSEL) { 2364 mq->mq_flags &= ~MQ_WSEL; 2365 selwakeup(&mq->mq_wsel); 2366 } 2367 mtx_unlock(&mq->mq_mutex); 2368 } 2369 } 2370 2371 static void 2372 mq_proc_exit(void *arg __unused, struct proc *p) 2373 { 2374 struct filedesc *fdp; 2375 struct file *fp; 2376 struct mqueue *mq; 2377 int i; 2378 2379 fdp = p->p_fd; 2380 FILEDESC_SLOCK(fdp); 2381 for (i = 0; i < fdp->fd_nfiles; ++i) { 2382 fp = fget_locked(fdp, i); 2383 if (fp != NULL && fp->f_ops == &mqueueops) { 2384 mq = FPTOMQ(fp); 2385 mtx_lock(&mq->mq_mutex); 2386 notifier_remove(p, FPTOMQ(fp), i); 2387 mtx_unlock(&mq->mq_mutex); 2388 } 2389 } 2390 FILEDESC_SUNLOCK(fdp); 2391 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left")); 2392 } 2393 2394 static int 2395 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 2396 int flags, struct thread *td) 2397 { 2398 return (EOPNOTSUPP); 2399 } 2400 2401 static int 2402 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 2403 int flags, struct thread *td) 2404 { 2405 return (EOPNOTSUPP); 2406 } 2407 2408 static int 2409 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred, 2410 struct thread *td) 2411 { 2412 2413 return (EINVAL); 2414 } 2415 2416 static int 2417 mqf_ioctl(struct file *fp, u_long cmd, void *data, 2418 struct ucred *active_cred, struct thread *td) 2419 { 2420 return (ENOTTY); 2421 } 2422 2423 static int 2424 mqf_poll(struct file *fp, int events, struct ucred *active_cred, 2425 struct thread *td) 2426 { 2427 struct mqueue *mq = FPTOMQ(fp); 2428 int revents = 0; 2429 2430 mtx_lock(&mq->mq_mutex); 2431 if (events & (POLLIN | POLLRDNORM)) { 2432 if (mq->mq_curmsgs) { 2433 revents |= events & (POLLIN | POLLRDNORM); 2434 } else { 2435 mq->mq_flags |= MQ_RSEL; 2436 selrecord(td, &mq->mq_rsel); 2437 } 2438 } 2439 if (events & POLLOUT) { 2440 if (mq->mq_curmsgs < mq->mq_maxmsg) 2441 revents |= POLLOUT; 2442 else { 2443 mq->mq_flags |= MQ_WSEL; 2444 selrecord(td, &mq->mq_wsel); 2445 } 2446 } 2447 mtx_unlock(&mq->mq_mutex); 2448 return (revents); 2449 } 2450 2451 static int 2452 mqf_close(struct file *fp, struct thread *td) 2453 { 2454 struct mqfs_node *pn; 2455 2456 fp->f_ops = &badfileops; 2457 pn = fp->f_data; 2458 fp->f_data = NULL; 2459 sx_xlock(&mqfs_data.mi_lock); 2460 mqnode_release(pn); 2461 sx_xunlock(&mqfs_data.mi_lock); 2462 return (0); 2463 } 2464 2465 static int 2466 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 2467 struct thread *td) 2468 { 2469 struct mqfs_node *pn = fp->f_data; 2470 2471 bzero(st, sizeof *st); 2472 sx_xlock(&mqfs_data.mi_lock); 2473 st->st_atim = pn->mn_atime; 2474 st->st_mtim = pn->mn_mtime; 2475 st->st_ctim = pn->mn_ctime; 2476 st->st_birthtim = pn->mn_birth; 2477 st->st_uid = pn->mn_uid; 2478 st->st_gid = pn->mn_gid; 2479 st->st_mode = S_IFIFO | pn->mn_mode; 2480 sx_xunlock(&mqfs_data.mi_lock); 2481 return (0); 2482 } 2483 2484 static int 2485 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 2486 struct thread *td) 2487 { 2488 struct mqfs_node *pn; 2489 int error; 2490 2491 error = 0; 2492 pn = fp->f_data; 2493 sx_xlock(&mqfs_data.mi_lock); 2494 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN, 2495 active_cred, NULL); 2496 if (error != 0) 2497 goto out; 2498 pn->mn_mode = mode & ACCESSPERMS; 2499 out: 2500 sx_xunlock(&mqfs_data.mi_lock); 2501 return (error); 2502 } 2503 2504 static int 2505 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 2506 struct thread *td) 2507 { 2508 struct mqfs_node *pn; 2509 int error; 2510 2511 error = 0; 2512 pn = fp->f_data; 2513 sx_xlock(&mqfs_data.mi_lock); 2514 if (uid == (uid_t)-1) 2515 uid = pn->mn_uid; 2516 if (gid == (gid_t)-1) 2517 gid = pn->mn_gid; 2518 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) || 2519 (gid != pn->mn_gid && !groupmember(gid, active_cred))) && 2520 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0))) 2521 goto out; 2522 pn->mn_uid = uid; 2523 pn->mn_gid = gid; 2524 out: 2525 sx_xunlock(&mqfs_data.mi_lock); 2526 return (error); 2527 } 2528 2529 static int 2530 mqf_kqfilter(struct file *fp, struct knote *kn) 2531 { 2532 struct mqueue *mq = FPTOMQ(fp); 2533 int error = 0; 2534 2535 if (kn->kn_filter == EVFILT_READ) { 2536 kn->kn_fop = &mq_rfiltops; 2537 knlist_add(&mq->mq_rsel.si_note, kn, 0); 2538 } else if (kn->kn_filter == EVFILT_WRITE) { 2539 kn->kn_fop = &mq_wfiltops; 2540 knlist_add(&mq->mq_wsel.si_note, kn, 0); 2541 } else 2542 error = EINVAL; 2543 return (error); 2544 } 2545 2546 static void 2547 filt_mqdetach(struct knote *kn) 2548 { 2549 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2550 2551 if (kn->kn_filter == EVFILT_READ) 2552 knlist_remove(&mq->mq_rsel.si_note, kn, 0); 2553 else if (kn->kn_filter == EVFILT_WRITE) 2554 knlist_remove(&mq->mq_wsel.si_note, kn, 0); 2555 else 2556 panic("filt_mqdetach"); 2557 } 2558 2559 static int 2560 filt_mqread(struct knote *kn, long hint) 2561 { 2562 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2563 2564 mtx_assert(&mq->mq_mutex, MA_OWNED); 2565 return (mq->mq_curmsgs != 0); 2566 } 2567 2568 static int 2569 filt_mqwrite(struct knote *kn, long hint) 2570 { 2571 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2572 2573 mtx_assert(&mq->mq_mutex, MA_OWNED); 2574 return (mq->mq_curmsgs < mq->mq_maxmsg); 2575 } 2576 2577 static struct fileops mqueueops = { 2578 .fo_read = mqf_read, 2579 .fo_write = mqf_write, 2580 .fo_truncate = mqf_truncate, 2581 .fo_ioctl = mqf_ioctl, 2582 .fo_poll = mqf_poll, 2583 .fo_kqfilter = mqf_kqfilter, 2584 .fo_stat = mqf_stat, 2585 .fo_chmod = mqf_chmod, 2586 .fo_chown = mqf_chown, 2587 .fo_close = mqf_close 2588 }; 2589 2590 static struct vop_vector mqfs_vnodeops = { 2591 .vop_default = &default_vnodeops, 2592 .vop_access = mqfs_access, 2593 .vop_cachedlookup = mqfs_lookup, 2594 .vop_lookup = vfs_cache_lookup, 2595 .vop_reclaim = mqfs_reclaim, 2596 .vop_create = mqfs_create, 2597 .vop_remove = mqfs_remove, 2598 .vop_inactive = mqfs_inactive, 2599 .vop_open = mqfs_open, 2600 .vop_close = mqfs_close, 2601 .vop_getattr = mqfs_getattr, 2602 .vop_setattr = mqfs_setattr, 2603 .vop_read = mqfs_read, 2604 .vop_write = VOP_EOPNOTSUPP, 2605 .vop_readdir = mqfs_readdir, 2606 .vop_mkdir = VOP_EOPNOTSUPP, 2607 .vop_rmdir = VOP_EOPNOTSUPP 2608 }; 2609 2610 static struct vfsops mqfs_vfsops = { 2611 .vfs_init = mqfs_init, 2612 .vfs_uninit = mqfs_uninit, 2613 .vfs_mount = mqfs_mount, 2614 .vfs_unmount = mqfs_unmount, 2615 .vfs_root = mqfs_root, 2616 .vfs_statfs = mqfs_statfs, 2617 }; 2618 2619 static struct vfsconf mqueuefs_vfsconf = { 2620 .vfc_version = VFS_VERSION, 2621 .vfc_name = "mqueuefs", 2622 .vfc_vfsops = &mqfs_vfsops, 2623 .vfc_typenum = -1, 2624 .vfc_flags = VFCF_SYNTHETIC 2625 }; 2626 2627 static struct syscall_helper_data mq_syscalls[] = { 2628 SYSCALL_INIT_HELPER(kmq_open), 2629 SYSCALL_INIT_HELPER(kmq_setattr), 2630 SYSCALL_INIT_HELPER(kmq_timedsend), 2631 SYSCALL_INIT_HELPER(kmq_timedreceive), 2632 SYSCALL_INIT_HELPER(kmq_notify), 2633 SYSCALL_INIT_HELPER(kmq_unlink), 2634 SYSCALL_INIT_LAST 2635 }; 2636 2637 #ifdef COMPAT_FREEBSD32 2638 #include <compat/freebsd32/freebsd32.h> 2639 #include <compat/freebsd32/freebsd32_proto.h> 2640 #include <compat/freebsd32/freebsd32_syscall.h> 2641 #include <compat/freebsd32/freebsd32_util.h> 2642 2643 static void 2644 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to) 2645 { 2646 2647 to->mq_flags = from->mq_flags; 2648 to->mq_maxmsg = from->mq_maxmsg; 2649 to->mq_msgsize = from->mq_msgsize; 2650 to->mq_curmsgs = from->mq_curmsgs; 2651 } 2652 2653 static void 2654 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to) 2655 { 2656 2657 to->mq_flags = from->mq_flags; 2658 to->mq_maxmsg = from->mq_maxmsg; 2659 to->mq_msgsize = from->mq_msgsize; 2660 to->mq_curmsgs = from->mq_curmsgs; 2661 } 2662 2663 int 2664 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap) 2665 { 2666 struct mq_attr attr; 2667 struct mq_attr32 attr32; 2668 int flags, error; 2669 2670 if ((uap->flags & O_ACCMODE) == O_ACCMODE) 2671 return (EINVAL); 2672 flags = FFLAGS(uap->flags); 2673 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2674 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2675 if (error) 2676 return (error); 2677 mq_attr_from32(&attr32, &attr); 2678 } 2679 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2680 uap->attr != NULL ? &attr : NULL)); 2681 } 2682 2683 int 2684 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap) 2685 { 2686 struct mq_attr attr, oattr; 2687 struct mq_attr32 attr32, oattr32; 2688 int error; 2689 2690 if (uap->attr != NULL) { 2691 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2692 if (error != 0) 2693 return (error); 2694 mq_attr_from32(&attr32, &attr); 2695 } 2696 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2697 &oattr); 2698 if (error != 0) 2699 return (error); 2700 if (uap->oattr != NULL) { 2701 mq_attr_to32(&oattr, &oattr32); 2702 error = copyout(&oattr32, uap->oattr, sizeof(oattr32)); 2703 } 2704 return (error); 2705 } 2706 2707 int 2708 freebsd32_kmq_timedsend(struct thread *td, 2709 struct freebsd32_kmq_timedsend_args *uap) 2710 { 2711 struct mqueue *mq; 2712 struct file *fp; 2713 struct timespec32 ets32; 2714 struct timespec *abs_timeout, ets; 2715 int error; 2716 int waitok; 2717 2718 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2719 if (error) 2720 return (error); 2721 if (uap->abs_timeout != NULL) { 2722 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2723 if (error != 0) 2724 return (error); 2725 CP(ets32, ets, tv_sec); 2726 CP(ets32, ets, tv_nsec); 2727 abs_timeout = &ets; 2728 } else 2729 abs_timeout = NULL; 2730 waitok = !(fp->f_flag & O_NONBLOCK); 2731 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2732 uap->msg_prio, waitok, abs_timeout); 2733 fdrop(fp, td); 2734 return (error); 2735 } 2736 2737 int 2738 freebsd32_kmq_timedreceive(struct thread *td, 2739 struct freebsd32_kmq_timedreceive_args *uap) 2740 { 2741 struct mqueue *mq; 2742 struct file *fp; 2743 struct timespec32 ets32; 2744 struct timespec *abs_timeout, ets; 2745 int error, waitok; 2746 2747 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2748 if (error) 2749 return (error); 2750 if (uap->abs_timeout != NULL) { 2751 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2752 if (error != 0) 2753 return (error); 2754 CP(ets32, ets, tv_sec); 2755 CP(ets32, ets, tv_nsec); 2756 abs_timeout = &ets; 2757 } else 2758 abs_timeout = NULL; 2759 waitok = !(fp->f_flag & O_NONBLOCK); 2760 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2761 uap->msg_prio, waitok, abs_timeout); 2762 fdrop(fp, td); 2763 return (error); 2764 } 2765 2766 static struct syscall_helper_data mq32_syscalls[] = { 2767 SYSCALL32_INIT_HELPER(freebsd32_kmq_open), 2768 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr), 2769 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend), 2770 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive), 2771 SYSCALL32_INIT_HELPER_COMPAT(kmq_notify), 2772 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink), 2773 SYSCALL_INIT_LAST 2774 }; 2775 #endif 2776 2777 static int 2778 mqinit(void) 2779 { 2780 int error; 2781 2782 error = syscall_helper_register(mq_syscalls); 2783 if (error != 0) 2784 return (error); 2785 #ifdef COMPAT_FREEBSD32 2786 error = syscall32_helper_register(mq32_syscalls); 2787 if (error != 0) 2788 return (error); 2789 #endif 2790 return (0); 2791 } 2792 2793 static int 2794 mqunload(void) 2795 { 2796 2797 #ifdef COMPAT_FREEBSD32 2798 syscall32_helper_unregister(mq32_syscalls); 2799 #endif 2800 syscall_helper_unregister(mq_syscalls); 2801 return (0); 2802 } 2803 2804 static int 2805 mq_modload(struct module *module, int cmd, void *arg) 2806 { 2807 int error = 0; 2808 2809 error = vfs_modevent(module, cmd, arg); 2810 if (error != 0) 2811 return (error); 2812 2813 switch (cmd) { 2814 case MOD_LOAD: 2815 error = mqinit(); 2816 if (error != 0) 2817 mqunload(); 2818 break; 2819 case MOD_UNLOAD: 2820 error = mqunload(); 2821 break; 2822 default: 2823 break; 2824 } 2825 return (error); 2826 } 2827 2828 static moduledata_t mqueuefs_mod = { 2829 "mqueuefs", 2830 mq_modload, 2831 &mqueuefs_vfsconf 2832 }; 2833 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE); 2834 MODULE_VERSION(mqueuefs, 1); 2835