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_compat.h" 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/systm.h> 53 #include <sys/limits.h> 54 #include <sys/buf.h> 55 #include <sys/capability.h> 56 #include <sys/dirent.h> 57 #include <sys/event.h> 58 #include <sys/eventhandler.h> 59 #include <sys/fcntl.h> 60 #include <sys/file.h> 61 #include <sys/filedesc.h> 62 #include <sys/lock.h> 63 #include <sys/malloc.h> 64 #include <sys/module.h> 65 #include <sys/mount.h> 66 #include <sys/mqueue.h> 67 #include <sys/mutex.h> 68 #include <sys/namei.h> 69 #include <sys/posix4.h> 70 #include <sys/poll.h> 71 #include <sys/priv.h> 72 #include <sys/proc.h> 73 #include <sys/queue.h> 74 #include <sys/sysproto.h> 75 #include <sys/stat.h> 76 #include <sys/syscall.h> 77 #include <sys/syscallsubr.h> 78 #include <sys/sysent.h> 79 #include <sys/sx.h> 80 #include <sys/sysctl.h> 81 #include <sys/taskqueue.h> 82 #include <sys/unistd.h> 83 #include <sys/vnode.h> 84 #include <machine/atomic.h> 85 86 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support"); 87 88 /* 89 * Limits and constants 90 */ 91 #define MQFS_NAMELEN NAME_MAX 92 #define MQFS_DELEN (8 + MQFS_NAMELEN) 93 94 /* node types */ 95 typedef enum { 96 mqfstype_none = 0, 97 mqfstype_root, 98 mqfstype_dir, 99 mqfstype_this, 100 mqfstype_parent, 101 mqfstype_file, 102 mqfstype_symlink, 103 } mqfs_type_t; 104 105 struct mqfs_node; 106 107 /* 108 * mqfs_info: describes a mqfs instance 109 */ 110 struct mqfs_info { 111 struct sx mi_lock; 112 struct mqfs_node *mi_root; 113 struct unrhdr *mi_unrhdr; 114 }; 115 116 struct mqfs_vdata { 117 LIST_ENTRY(mqfs_vdata) mv_link; 118 struct mqfs_node *mv_node; 119 struct vnode *mv_vnode; 120 struct task mv_task; 121 }; 122 123 /* 124 * mqfs_node: describes a node (file or directory) within a mqfs 125 */ 126 struct mqfs_node { 127 char mn_name[MQFS_NAMELEN+1]; 128 struct mqfs_info *mn_info; 129 struct mqfs_node *mn_parent; 130 LIST_HEAD(,mqfs_node) mn_children; 131 LIST_ENTRY(mqfs_node) mn_sibling; 132 LIST_HEAD(,mqfs_vdata) mn_vnodes; 133 int mn_refcount; 134 mqfs_type_t mn_type; 135 int mn_deleted; 136 uint32_t mn_fileno; 137 void *mn_data; 138 struct timespec mn_birth; 139 struct timespec mn_ctime; 140 struct timespec mn_atime; 141 struct timespec mn_mtime; 142 uid_t mn_uid; 143 gid_t mn_gid; 144 int mn_mode; 145 }; 146 147 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node) 148 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data)) 149 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data)) 150 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \ 151 (fp)->f_data)->mn_data)) 152 153 TAILQ_HEAD(msgq, mqueue_msg); 154 155 struct mqueue; 156 157 struct mqueue_notifier { 158 LIST_ENTRY(mqueue_notifier) nt_link; 159 struct sigevent nt_sigev; 160 ksiginfo_t nt_ksi; 161 struct proc *nt_proc; 162 }; 163 164 struct mqueue { 165 struct mtx mq_mutex; 166 int mq_flags; 167 long mq_maxmsg; 168 long mq_msgsize; 169 long mq_curmsgs; 170 long mq_totalbytes; 171 struct msgq mq_msgq; 172 int mq_receivers; 173 int mq_senders; 174 struct selinfo mq_rsel; 175 struct selinfo mq_wsel; 176 struct mqueue_notifier *mq_notifier; 177 }; 178 179 #define MQ_RSEL 0x01 180 #define MQ_WSEL 0x02 181 182 struct mqueue_msg { 183 TAILQ_ENTRY(mqueue_msg) msg_link; 184 unsigned int msg_prio; 185 unsigned int msg_size; 186 /* following real data... */ 187 }; 188 189 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0, 190 "POSIX real time message queue"); 191 192 static int default_maxmsg = 10; 193 static int default_msgsize = 1024; 194 195 static int maxmsg = 100; 196 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW, 197 &maxmsg, 0, "Default maximum messages in queue"); 198 static int maxmsgsize = 16384; 199 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW, 200 &maxmsgsize, 0, "Default maximum message size"); 201 static int maxmq = 100; 202 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW, 203 &maxmq, 0, "maximum message queues"); 204 static int curmq = 0; 205 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW, 206 &curmq, 0, "current message queue number"); 207 static int unloadable = 0; 208 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data"); 209 210 static eventhandler_tag exit_tag; 211 212 /* Only one instance per-system */ 213 static struct mqfs_info mqfs_data; 214 static uma_zone_t mqnode_zone; 215 static uma_zone_t mqueue_zone; 216 static uma_zone_t mvdata_zone; 217 static uma_zone_t mqnoti_zone; 218 static struct vop_vector mqfs_vnodeops; 219 static struct fileops mqueueops; 220 221 /* 222 * Directory structure construction and manipulation 223 */ 224 #ifdef notyet 225 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent, 226 const char *name, int namelen, struct ucred *cred, int mode); 227 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent, 228 const char *name, int namelen, struct ucred *cred, int mode); 229 #endif 230 231 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent, 232 const char *name, int namelen, struct ucred *cred, int mode); 233 static int mqfs_destroy(struct mqfs_node *mn); 234 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn); 235 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn); 236 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn); 237 238 /* 239 * Message queue construction and maniplation 240 */ 241 static struct mqueue *mqueue_alloc(const struct mq_attr *attr); 242 static void mqueue_free(struct mqueue *mq); 243 static int mqueue_send(struct mqueue *mq, const char *msg_ptr, 244 size_t msg_len, unsigned msg_prio, int waitok, 245 const struct timespec *abs_timeout); 246 static int mqueue_receive(struct mqueue *mq, char *msg_ptr, 247 size_t msg_len, unsigned *msg_prio, int waitok, 248 const struct timespec *abs_timeout); 249 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, 250 int timo); 251 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, 252 int timo); 253 static void mqueue_send_notification(struct mqueue *mq); 254 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp); 255 static void mq_proc_exit(void *arg, struct proc *p); 256 257 /* 258 * kqueue filters 259 */ 260 static void filt_mqdetach(struct knote *kn); 261 static int filt_mqread(struct knote *kn, long hint); 262 static int filt_mqwrite(struct knote *kn, long hint); 263 264 struct filterops mq_rfiltops = { 265 .f_isfd = 1, 266 .f_detach = filt_mqdetach, 267 .f_event = filt_mqread, 268 }; 269 struct filterops mq_wfiltops = { 270 .f_isfd = 1, 271 .f_detach = filt_mqdetach, 272 .f_event = filt_mqwrite, 273 }; 274 275 /* 276 * Initialize fileno bitmap 277 */ 278 static void 279 mqfs_fileno_init(struct mqfs_info *mi) 280 { 281 struct unrhdr *up; 282 283 up = new_unrhdr(1, INT_MAX, NULL); 284 mi->mi_unrhdr = up; 285 } 286 287 /* 288 * Tear down fileno bitmap 289 */ 290 static void 291 mqfs_fileno_uninit(struct mqfs_info *mi) 292 { 293 struct unrhdr *up; 294 295 up = mi->mi_unrhdr; 296 mi->mi_unrhdr = NULL; 297 delete_unrhdr(up); 298 } 299 300 /* 301 * Allocate a file number 302 */ 303 static void 304 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn) 305 { 306 /* make sure our parent has a file number */ 307 if (mn->mn_parent && !mn->mn_parent->mn_fileno) 308 mqfs_fileno_alloc(mi, mn->mn_parent); 309 310 switch (mn->mn_type) { 311 case mqfstype_root: 312 case mqfstype_dir: 313 case mqfstype_file: 314 case mqfstype_symlink: 315 mn->mn_fileno = alloc_unr(mi->mi_unrhdr); 316 break; 317 case mqfstype_this: 318 KASSERT(mn->mn_parent != NULL, 319 ("mqfstype_this node has no parent")); 320 mn->mn_fileno = mn->mn_parent->mn_fileno; 321 break; 322 case mqfstype_parent: 323 KASSERT(mn->mn_parent != NULL, 324 ("mqfstype_parent node has no parent")); 325 if (mn->mn_parent == mi->mi_root) { 326 mn->mn_fileno = mn->mn_parent->mn_fileno; 327 break; 328 } 329 KASSERT(mn->mn_parent->mn_parent != NULL, 330 ("mqfstype_parent node has no grandparent")); 331 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno; 332 break; 333 default: 334 KASSERT(0, 335 ("mqfs_fileno_alloc() called for unknown type node: %d", 336 mn->mn_type)); 337 break; 338 } 339 } 340 341 /* 342 * Release a file number 343 */ 344 static void 345 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn) 346 { 347 switch (mn->mn_type) { 348 case mqfstype_root: 349 case mqfstype_dir: 350 case mqfstype_file: 351 case mqfstype_symlink: 352 free_unr(mi->mi_unrhdr, mn->mn_fileno); 353 break; 354 case mqfstype_this: 355 case mqfstype_parent: 356 /* ignore these, as they don't "own" their file number */ 357 break; 358 default: 359 KASSERT(0, 360 ("mqfs_fileno_free() called for unknown type node: %d", 361 mn->mn_type)); 362 break; 363 } 364 } 365 366 static __inline struct mqfs_node * 367 mqnode_alloc(void) 368 { 369 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO); 370 } 371 372 static __inline void 373 mqnode_free(struct mqfs_node *node) 374 { 375 uma_zfree(mqnode_zone, node); 376 } 377 378 static __inline void 379 mqnode_addref(struct mqfs_node *node) 380 { 381 atomic_fetchadd_int(&node->mn_refcount, 1); 382 } 383 384 static __inline void 385 mqnode_release(struct mqfs_node *node) 386 { 387 struct mqfs_info *mqfs; 388 int old, exp; 389 390 mqfs = node->mn_info; 391 old = atomic_fetchadd_int(&node->mn_refcount, -1); 392 if (node->mn_type == mqfstype_dir || 393 node->mn_type == mqfstype_root) 394 exp = 3; /* include . and .. */ 395 else 396 exp = 1; 397 if (old == exp) { 398 int locked = sx_xlocked(&mqfs->mi_lock); 399 if (!locked) 400 sx_xlock(&mqfs->mi_lock); 401 mqfs_destroy(node); 402 if (!locked) 403 sx_xunlock(&mqfs->mi_lock); 404 } 405 } 406 407 /* 408 * Add a node to a directory 409 */ 410 static int 411 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node) 412 { 413 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__)); 414 KASSERT(parent->mn_info != NULL, 415 ("%s(): parent has no mn_info", __func__)); 416 KASSERT(parent->mn_type == mqfstype_dir || 417 parent->mn_type == mqfstype_root, 418 ("%s(): parent is not a directory", __func__)); 419 420 node->mn_info = parent->mn_info; 421 node->mn_parent = parent; 422 LIST_INIT(&node->mn_children); 423 LIST_INIT(&node->mn_vnodes); 424 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling); 425 mqnode_addref(parent); 426 return (0); 427 } 428 429 static struct mqfs_node * 430 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode, 431 int nodetype) 432 { 433 struct mqfs_node *node; 434 435 node = mqnode_alloc(); 436 strncpy(node->mn_name, name, namelen); 437 node->mn_type = nodetype; 438 node->mn_refcount = 1; 439 vfs_timestamp(&node->mn_birth); 440 node->mn_ctime = node->mn_atime = node->mn_mtime 441 = node->mn_birth; 442 node->mn_uid = cred->cr_uid; 443 node->mn_gid = cred->cr_gid; 444 node->mn_mode = mode; 445 return (node); 446 } 447 448 /* 449 * Create a file 450 */ 451 static struct mqfs_node * 452 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen, 453 struct ucred *cred, int mode) 454 { 455 struct mqfs_node *node; 456 457 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file); 458 if (mqfs_add_node(parent, node) != 0) { 459 mqnode_free(node); 460 return (NULL); 461 } 462 return (node); 463 } 464 465 /* 466 * Add . and .. to a directory 467 */ 468 static int 469 mqfs_fixup_dir(struct mqfs_node *parent) 470 { 471 struct mqfs_node *dir; 472 473 dir = mqnode_alloc(); 474 dir->mn_name[0] = '.'; 475 dir->mn_type = mqfstype_this; 476 dir->mn_refcount = 1; 477 if (mqfs_add_node(parent, dir) != 0) { 478 mqnode_free(dir); 479 return (-1); 480 } 481 482 dir = mqnode_alloc(); 483 dir->mn_name[0] = dir->mn_name[1] = '.'; 484 dir->mn_type = mqfstype_parent; 485 dir->mn_refcount = 1; 486 487 if (mqfs_add_node(parent, dir) != 0) { 488 mqnode_free(dir); 489 return (-1); 490 } 491 492 return (0); 493 } 494 495 #ifdef notyet 496 497 /* 498 * Create a directory 499 */ 500 static struct mqfs_node * 501 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen, 502 struct ucred *cred, int mode) 503 { 504 struct mqfs_node *node; 505 506 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir); 507 if (mqfs_add_node(parent, node) != 0) { 508 mqnode_free(node); 509 return (NULL); 510 } 511 512 if (mqfs_fixup_dir(node) != 0) { 513 mqfs_destroy(node); 514 return (NULL); 515 } 516 return (node); 517 } 518 519 /* 520 * Create a symlink 521 */ 522 static struct mqfs_node * 523 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen, 524 struct ucred *cred, int mode) 525 { 526 struct mqfs_node *node; 527 528 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink); 529 if (mqfs_add_node(parent, node) != 0) { 530 mqnode_free(node); 531 return (NULL); 532 } 533 return (node); 534 } 535 536 #endif 537 538 /* 539 * Destroy a node or a tree of nodes 540 */ 541 static int 542 mqfs_destroy(struct mqfs_node *node) 543 { 544 struct mqfs_node *parent; 545 546 KASSERT(node != NULL, 547 ("%s(): node is NULL", __func__)); 548 KASSERT(node->mn_info != NULL, 549 ("%s(): node has no mn_info", __func__)); 550 551 /* destroy children */ 552 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root) 553 while (! LIST_EMPTY(&node->mn_children)) 554 mqfs_destroy(LIST_FIRST(&node->mn_children)); 555 556 /* unlink from parent */ 557 if ((parent = node->mn_parent) != NULL) { 558 KASSERT(parent->mn_info == node->mn_info, 559 ("%s(): parent has different mn_info", __func__)); 560 LIST_REMOVE(node, mn_sibling); 561 } 562 563 if (node->mn_fileno != 0) 564 mqfs_fileno_free(node->mn_info, node); 565 if (node->mn_data != NULL) 566 mqueue_free(node->mn_data); 567 mqnode_free(node); 568 return (0); 569 } 570 571 /* 572 * Mount a mqfs instance 573 */ 574 static int 575 mqfs_mount(struct mount *mp) 576 { 577 struct statfs *sbp; 578 579 if (mp->mnt_flag & MNT_UPDATE) 580 return (EOPNOTSUPP); 581 582 mp->mnt_data = &mqfs_data; 583 MNT_ILOCK(mp); 584 mp->mnt_flag |= MNT_LOCAL; 585 MNT_IUNLOCK(mp); 586 vfs_getnewfsid(mp); 587 588 sbp = &mp->mnt_stat; 589 vfs_mountedfrom(mp, "mqueue"); 590 sbp->f_bsize = PAGE_SIZE; 591 sbp->f_iosize = PAGE_SIZE; 592 sbp->f_blocks = 1; 593 sbp->f_bfree = 0; 594 sbp->f_bavail = 0; 595 sbp->f_files = 1; 596 sbp->f_ffree = 0; 597 return (0); 598 } 599 600 /* 601 * Unmount a mqfs instance 602 */ 603 static int 604 mqfs_unmount(struct mount *mp, int mntflags) 605 { 606 int error; 607 608 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0, 609 curthread); 610 return (error); 611 } 612 613 /* 614 * Return a root vnode 615 */ 616 static int 617 mqfs_root(struct mount *mp, int flags, struct vnode **vpp) 618 { 619 struct mqfs_info *mqfs; 620 int ret; 621 622 mqfs = VFSTOMQFS(mp); 623 ret = mqfs_allocv(mp, vpp, mqfs->mi_root); 624 return (ret); 625 } 626 627 /* 628 * Return filesystem stats 629 */ 630 static int 631 mqfs_statfs(struct mount *mp, struct statfs *sbp) 632 { 633 /* XXX update statistics */ 634 return (0); 635 } 636 637 /* 638 * Initialize a mqfs instance 639 */ 640 static int 641 mqfs_init(struct vfsconf *vfc) 642 { 643 struct mqfs_node *root; 644 struct mqfs_info *mi; 645 646 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node), 647 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 648 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue), 649 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 650 mvdata_zone = uma_zcreate("mvdata", 651 sizeof(struct mqfs_vdata), NULL, NULL, NULL, 652 NULL, UMA_ALIGN_PTR, 0); 653 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier), 654 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 655 mi = &mqfs_data; 656 sx_init(&mi->mi_lock, "mqfs lock"); 657 /* set up the root diretory */ 658 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777, 659 mqfstype_root); 660 root->mn_info = mi; 661 LIST_INIT(&root->mn_children); 662 LIST_INIT(&root->mn_vnodes); 663 mi->mi_root = root; 664 mqfs_fileno_init(mi); 665 mqfs_fileno_alloc(mi, root); 666 mqfs_fixup_dir(root); 667 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL, 668 EVENTHANDLER_PRI_ANY); 669 mq_fdclose = mqueue_fdclose; 670 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); 671 return (0); 672 } 673 674 /* 675 * Destroy a mqfs instance 676 */ 677 static int 678 mqfs_uninit(struct vfsconf *vfc) 679 { 680 struct mqfs_info *mi; 681 682 if (!unloadable) 683 return (EOPNOTSUPP); 684 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 685 mi = &mqfs_data; 686 mqfs_destroy(mi->mi_root); 687 mi->mi_root = NULL; 688 mqfs_fileno_uninit(mi); 689 sx_destroy(&mi->mi_lock); 690 uma_zdestroy(mqnode_zone); 691 uma_zdestroy(mqueue_zone); 692 uma_zdestroy(mvdata_zone); 693 uma_zdestroy(mqnoti_zone); 694 return (0); 695 } 696 697 /* 698 * task routine 699 */ 700 static void 701 do_recycle(void *context, int pending __unused) 702 { 703 struct vnode *vp = (struct vnode *)context; 704 705 vrecycle(vp); 706 vdrop(vp); 707 } 708 709 /* 710 * Allocate a vnode 711 */ 712 static int 713 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn) 714 { 715 struct mqfs_vdata *vd; 716 struct mqfs_info *mqfs; 717 struct vnode *newvpp; 718 int error; 719 720 mqfs = pn->mn_info; 721 *vpp = NULL; 722 sx_xlock(&mqfs->mi_lock); 723 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 724 if (vd->mv_vnode->v_mount == mp) { 725 vhold(vd->mv_vnode); 726 break; 727 } 728 } 729 730 if (vd != NULL) { 731 found: 732 *vpp = vd->mv_vnode; 733 sx_xunlock(&mqfs->mi_lock); 734 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread); 735 vdrop(*vpp); 736 return (error); 737 } 738 sx_xunlock(&mqfs->mi_lock); 739 740 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp); 741 if (error) 742 return (error); 743 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY); 744 error = insmntque(newvpp, mp); 745 if (error != 0) 746 return (error); 747 748 sx_xlock(&mqfs->mi_lock); 749 /* 750 * Check if it has already been allocated 751 * while we were blocked. 752 */ 753 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 754 if (vd->mv_vnode->v_mount == mp) { 755 vhold(vd->mv_vnode); 756 sx_xunlock(&mqfs->mi_lock); 757 758 vgone(newvpp); 759 vput(newvpp); 760 goto found; 761 } 762 } 763 764 *vpp = newvpp; 765 766 vd = uma_zalloc(mvdata_zone, M_WAITOK); 767 (*vpp)->v_data = vd; 768 vd->mv_vnode = *vpp; 769 vd->mv_node = pn; 770 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp); 771 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link); 772 mqnode_addref(pn); 773 switch (pn->mn_type) { 774 case mqfstype_root: 775 (*vpp)->v_vflag = VV_ROOT; 776 /* fall through */ 777 case mqfstype_dir: 778 case mqfstype_this: 779 case mqfstype_parent: 780 (*vpp)->v_type = VDIR; 781 break; 782 case mqfstype_file: 783 (*vpp)->v_type = VREG; 784 break; 785 case mqfstype_symlink: 786 (*vpp)->v_type = VLNK; 787 break; 788 case mqfstype_none: 789 KASSERT(0, ("mqfs_allocf called for null node\n")); 790 default: 791 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type); 792 } 793 sx_xunlock(&mqfs->mi_lock); 794 return (0); 795 } 796 797 /* 798 * Search a directory entry 799 */ 800 static struct mqfs_node * 801 mqfs_search(struct mqfs_node *pd, const char *name, int len) 802 { 803 struct mqfs_node *pn; 804 805 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED); 806 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 807 if (strncmp(pn->mn_name, name, len) == 0 && 808 pn->mn_name[len] == '\0') 809 return (pn); 810 } 811 return (NULL); 812 } 813 814 /* 815 * Look up a file or directory. 816 */ 817 static int 818 mqfs_lookupx(struct vop_cachedlookup_args *ap) 819 { 820 struct componentname *cnp; 821 struct vnode *dvp, **vpp; 822 struct mqfs_node *pd; 823 struct mqfs_node *pn; 824 struct mqfs_info *mqfs; 825 int nameiop, flags, error, namelen; 826 char *pname; 827 struct thread *td; 828 829 cnp = ap->a_cnp; 830 vpp = ap->a_vpp; 831 dvp = ap->a_dvp; 832 pname = cnp->cn_nameptr; 833 namelen = cnp->cn_namelen; 834 td = cnp->cn_thread; 835 flags = cnp->cn_flags; 836 nameiop = cnp->cn_nameiop; 837 pd = VTON(dvp); 838 pn = NULL; 839 mqfs = pd->mn_info; 840 *vpp = NULLVP; 841 842 if (dvp->v_type != VDIR) 843 return (ENOTDIR); 844 845 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 846 if (error) 847 return (error); 848 849 /* shortcut: check if the name is too long */ 850 if (cnp->cn_namelen >= MQFS_NAMELEN) 851 return (ENOENT); 852 853 /* self */ 854 if (namelen == 1 && pname[0] == '.') { 855 if ((flags & ISLASTCN) && nameiop != LOOKUP) 856 return (EINVAL); 857 pn = pd; 858 *vpp = dvp; 859 VREF(dvp); 860 return (0); 861 } 862 863 /* parent */ 864 if (cnp->cn_flags & ISDOTDOT) { 865 if (dvp->v_vflag & VV_ROOT) 866 return (EIO); 867 if ((flags & ISLASTCN) && nameiop != LOOKUP) 868 return (EINVAL); 869 VOP_UNLOCK(dvp, 0); 870 KASSERT(pd->mn_parent, ("non-root directory has no parent")); 871 pn = pd->mn_parent; 872 error = mqfs_allocv(dvp->v_mount, vpp, pn); 873 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 874 return (error); 875 } 876 877 /* named node */ 878 sx_xlock(&mqfs->mi_lock); 879 pn = mqfs_search(pd, pname, namelen); 880 if (pn != NULL) 881 mqnode_addref(pn); 882 sx_xunlock(&mqfs->mi_lock); 883 884 /* found */ 885 if (pn != NULL) { 886 /* DELETE */ 887 if (nameiop == DELETE && (flags & ISLASTCN)) { 888 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 889 if (error) { 890 mqnode_release(pn); 891 return (error); 892 } 893 if (*vpp == dvp) { 894 VREF(dvp); 895 *vpp = dvp; 896 mqnode_release(pn); 897 return (0); 898 } 899 } 900 901 /* allocate vnode */ 902 error = mqfs_allocv(dvp->v_mount, vpp, pn); 903 mqnode_release(pn); 904 if (error == 0 && cnp->cn_flags & MAKEENTRY) 905 cache_enter(dvp, *vpp, cnp); 906 return (error); 907 } 908 909 /* not found */ 910 911 /* will create a new entry in the directory ? */ 912 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT) 913 && (flags & ISLASTCN)) { 914 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 915 if (error) 916 return (error); 917 cnp->cn_flags |= SAVENAME; 918 return (EJUSTRETURN); 919 } 920 return (ENOENT); 921 } 922 923 #if 0 924 struct vop_lookup_args { 925 struct vop_generic_args a_gen; 926 struct vnode *a_dvp; 927 struct vnode **a_vpp; 928 struct componentname *a_cnp; 929 }; 930 #endif 931 932 /* 933 * vnode lookup operation 934 */ 935 static int 936 mqfs_lookup(struct vop_cachedlookup_args *ap) 937 { 938 int rc; 939 940 rc = mqfs_lookupx(ap); 941 return (rc); 942 } 943 944 #if 0 945 struct vop_create_args { 946 struct vnode *a_dvp; 947 struct vnode **a_vpp; 948 struct componentname *a_cnp; 949 struct vattr *a_vap; 950 }; 951 #endif 952 953 /* 954 * vnode creation operation 955 */ 956 static int 957 mqfs_create(struct vop_create_args *ap) 958 { 959 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 960 struct componentname *cnp = ap->a_cnp; 961 struct mqfs_node *pd; 962 struct mqfs_node *pn; 963 struct mqueue *mq; 964 int error; 965 966 pd = VTON(ap->a_dvp); 967 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 968 return (ENOTDIR); 969 mq = mqueue_alloc(NULL); 970 if (mq == NULL) 971 return (EAGAIN); 972 sx_xlock(&mqfs->mi_lock); 973 if ((cnp->cn_flags & HASBUF) == 0) 974 panic("%s: no name", __func__); 975 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen, 976 cnp->cn_cred, ap->a_vap->va_mode); 977 if (pn == NULL) { 978 sx_xunlock(&mqfs->mi_lock); 979 error = ENOSPC; 980 } else { 981 mqnode_addref(pn); 982 sx_xunlock(&mqfs->mi_lock); 983 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 984 mqnode_release(pn); 985 if (error) 986 mqfs_destroy(pn); 987 else 988 pn->mn_data = mq; 989 } 990 if (error) 991 mqueue_free(mq); 992 return (error); 993 } 994 995 /* 996 * Remove an entry 997 */ 998 static 999 int do_unlink(struct mqfs_node *pn, struct ucred *ucred) 1000 { 1001 struct mqfs_node *parent; 1002 struct mqfs_vdata *vd; 1003 int error = 0; 1004 1005 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED); 1006 1007 if (ucred->cr_uid != pn->mn_uid && 1008 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0) 1009 error = EACCES; 1010 else if (!pn->mn_deleted) { 1011 parent = pn->mn_parent; 1012 pn->mn_parent = NULL; 1013 pn->mn_deleted = 1; 1014 LIST_REMOVE(pn, mn_sibling); 1015 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 1016 cache_purge(vd->mv_vnode); 1017 vhold(vd->mv_vnode); 1018 taskqueue_enqueue(taskqueue_thread, &vd->mv_task); 1019 } 1020 mqnode_release(pn); 1021 mqnode_release(parent); 1022 } else 1023 error = ENOENT; 1024 return (error); 1025 } 1026 1027 #if 0 1028 struct vop_remove_args { 1029 struct vnode *a_dvp; 1030 struct vnode *a_vp; 1031 struct componentname *a_cnp; 1032 }; 1033 #endif 1034 1035 /* 1036 * vnode removal operation 1037 */ 1038 static int 1039 mqfs_remove(struct vop_remove_args *ap) 1040 { 1041 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1042 struct mqfs_node *pn; 1043 int error; 1044 1045 if (ap->a_vp->v_type == VDIR) 1046 return (EPERM); 1047 pn = VTON(ap->a_vp); 1048 sx_xlock(&mqfs->mi_lock); 1049 error = do_unlink(pn, ap->a_cnp->cn_cred); 1050 sx_xunlock(&mqfs->mi_lock); 1051 return (error); 1052 } 1053 1054 #if 0 1055 struct vop_inactive_args { 1056 struct vnode *a_vp; 1057 struct thread *a_td; 1058 }; 1059 #endif 1060 1061 static int 1062 mqfs_inactive(struct vop_inactive_args *ap) 1063 { 1064 struct mqfs_node *pn = VTON(ap->a_vp); 1065 1066 if (pn->mn_deleted) 1067 vrecycle(ap->a_vp); 1068 return (0); 1069 } 1070 1071 #if 0 1072 struct vop_reclaim_args { 1073 struct vop_generic_args a_gen; 1074 struct vnode *a_vp; 1075 struct thread *a_td; 1076 }; 1077 #endif 1078 1079 static int 1080 mqfs_reclaim(struct vop_reclaim_args *ap) 1081 { 1082 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount); 1083 struct vnode *vp = ap->a_vp; 1084 struct mqfs_node *pn; 1085 struct mqfs_vdata *vd; 1086 1087 vd = vp->v_data; 1088 pn = vd->mv_node; 1089 sx_xlock(&mqfs->mi_lock); 1090 vp->v_data = NULL; 1091 LIST_REMOVE(vd, mv_link); 1092 uma_zfree(mvdata_zone, vd); 1093 mqnode_release(pn); 1094 sx_xunlock(&mqfs->mi_lock); 1095 return (0); 1096 } 1097 1098 #if 0 1099 struct vop_open_args { 1100 struct vop_generic_args a_gen; 1101 struct vnode *a_vp; 1102 int a_mode; 1103 struct ucred *a_cred; 1104 struct thread *a_td; 1105 struct file *a_fp; 1106 }; 1107 #endif 1108 1109 static int 1110 mqfs_open(struct vop_open_args *ap) 1111 { 1112 return (0); 1113 } 1114 1115 #if 0 1116 struct vop_close_args { 1117 struct vop_generic_args a_gen; 1118 struct vnode *a_vp; 1119 int a_fflag; 1120 struct ucred *a_cred; 1121 struct thread *a_td; 1122 }; 1123 #endif 1124 1125 static int 1126 mqfs_close(struct vop_close_args *ap) 1127 { 1128 return (0); 1129 } 1130 1131 #if 0 1132 struct vop_access_args { 1133 struct vop_generic_args a_gen; 1134 struct vnode *a_vp; 1135 accmode_t a_accmode; 1136 struct ucred *a_cred; 1137 struct thread *a_td; 1138 }; 1139 #endif 1140 1141 /* 1142 * Verify permissions 1143 */ 1144 static int 1145 mqfs_access(struct vop_access_args *ap) 1146 { 1147 struct vnode *vp = ap->a_vp; 1148 struct vattr vattr; 1149 int error; 1150 1151 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 1152 if (error) 1153 return (error); 1154 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid, 1155 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL); 1156 return (error); 1157 } 1158 1159 #if 0 1160 struct vop_getattr_args { 1161 struct vop_generic_args a_gen; 1162 struct vnode *a_vp; 1163 struct vattr *a_vap; 1164 struct ucred *a_cred; 1165 }; 1166 #endif 1167 1168 /* 1169 * Get file attributes 1170 */ 1171 static int 1172 mqfs_getattr(struct vop_getattr_args *ap) 1173 { 1174 struct vnode *vp = ap->a_vp; 1175 struct mqfs_node *pn = VTON(vp); 1176 struct vattr *vap = ap->a_vap; 1177 int error = 0; 1178 1179 vap->va_type = vp->v_type; 1180 vap->va_mode = pn->mn_mode; 1181 vap->va_nlink = 1; 1182 vap->va_uid = pn->mn_uid; 1183 vap->va_gid = pn->mn_gid; 1184 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 1185 vap->va_fileid = pn->mn_fileno; 1186 vap->va_size = 0; 1187 vap->va_blocksize = PAGE_SIZE; 1188 vap->va_bytes = vap->va_size = 0; 1189 vap->va_atime = pn->mn_atime; 1190 vap->va_mtime = pn->mn_mtime; 1191 vap->va_ctime = pn->mn_ctime; 1192 vap->va_birthtime = pn->mn_birth; 1193 vap->va_gen = 0; 1194 vap->va_flags = 0; 1195 vap->va_rdev = NODEV; 1196 vap->va_bytes = 0; 1197 vap->va_filerev = 0; 1198 return (error); 1199 } 1200 1201 #if 0 1202 struct vop_setattr_args { 1203 struct vop_generic_args a_gen; 1204 struct vnode *a_vp; 1205 struct vattr *a_vap; 1206 struct ucred *a_cred; 1207 }; 1208 #endif 1209 /* 1210 * Set attributes 1211 */ 1212 static int 1213 mqfs_setattr(struct vop_setattr_args *ap) 1214 { 1215 struct mqfs_node *pn; 1216 struct vattr *vap; 1217 struct vnode *vp; 1218 struct thread *td; 1219 int c, error; 1220 uid_t uid; 1221 gid_t gid; 1222 1223 td = curthread; 1224 vap = ap->a_vap; 1225 vp = ap->a_vp; 1226 if ((vap->va_type != VNON) || 1227 (vap->va_nlink != VNOVAL) || 1228 (vap->va_fsid != VNOVAL) || 1229 (vap->va_fileid != VNOVAL) || 1230 (vap->va_blocksize != VNOVAL) || 1231 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1232 (vap->va_rdev != VNOVAL) || 1233 ((int)vap->va_bytes != VNOVAL) || 1234 (vap->va_gen != VNOVAL)) { 1235 return (EINVAL); 1236 } 1237 1238 pn = VTON(vp); 1239 1240 error = c = 0; 1241 if (vap->va_uid == (uid_t)VNOVAL) 1242 uid = pn->mn_uid; 1243 else 1244 uid = vap->va_uid; 1245 if (vap->va_gid == (gid_t)VNOVAL) 1246 gid = pn->mn_gid; 1247 else 1248 gid = vap->va_gid; 1249 1250 if (uid != pn->mn_uid || gid != pn->mn_gid) { 1251 /* 1252 * To modify the ownership of a file, must possess VADMIN 1253 * for that file. 1254 */ 1255 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td))) 1256 return (error); 1257 1258 /* 1259 * XXXRW: Why is there a privilege check here: shouldn't the 1260 * check in VOP_ACCESS() be enough? Also, are the group bits 1261 * below definitely right? 1262 */ 1263 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid || 1264 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) && 1265 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0) 1266 return (error); 1267 pn->mn_uid = uid; 1268 pn->mn_gid = gid; 1269 c = 1; 1270 } 1271 1272 if (vap->va_mode != (mode_t)VNOVAL) { 1273 if ((ap->a_cred->cr_uid != pn->mn_uid) && 1274 (error = priv_check(td, PRIV_MQ_ADMIN))) 1275 return (error); 1276 pn->mn_mode = vap->va_mode; 1277 c = 1; 1278 } 1279 1280 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1281 /* See the comment in ufs_vnops::ufs_setattr(). */ 1282 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) && 1283 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1284 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td)))) 1285 return (error); 1286 if (vap->va_atime.tv_sec != VNOVAL) { 1287 pn->mn_atime = vap->va_atime; 1288 } 1289 if (vap->va_mtime.tv_sec != VNOVAL) { 1290 pn->mn_mtime = vap->va_mtime; 1291 } 1292 c = 1; 1293 } 1294 if (c) { 1295 vfs_timestamp(&pn->mn_ctime); 1296 } 1297 return (0); 1298 } 1299 1300 #if 0 1301 struct vop_read_args { 1302 struct vop_generic_args a_gen; 1303 struct vnode *a_vp; 1304 struct uio *a_uio; 1305 int a_ioflag; 1306 struct ucred *a_cred; 1307 }; 1308 #endif 1309 1310 /* 1311 * Read from a file 1312 */ 1313 static int 1314 mqfs_read(struct vop_read_args *ap) 1315 { 1316 char buf[80]; 1317 struct vnode *vp = ap->a_vp; 1318 struct uio *uio = ap->a_uio; 1319 struct mqfs_node *pn; 1320 struct mqueue *mq; 1321 int len, error; 1322 1323 if (vp->v_type != VREG) 1324 return (EINVAL); 1325 1326 pn = VTON(vp); 1327 mq = VTOMQ(vp); 1328 snprintf(buf, sizeof(buf), 1329 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n", 1330 mq->mq_totalbytes, 1331 mq->mq_maxmsg, 1332 mq->mq_curmsgs, 1333 mq->mq_msgsize); 1334 buf[sizeof(buf)-1] = '\0'; 1335 len = strlen(buf); 1336 error = uiomove_frombuf(buf, len, uio); 1337 return (error); 1338 } 1339 1340 #if 0 1341 struct vop_readdir_args { 1342 struct vop_generic_args a_gen; 1343 struct vnode *a_vp; 1344 struct uio *a_uio; 1345 struct ucred *a_cred; 1346 int *a_eofflag; 1347 int *a_ncookies; 1348 u_long **a_cookies; 1349 }; 1350 #endif 1351 1352 /* 1353 * Return directory entries. 1354 */ 1355 static int 1356 mqfs_readdir(struct vop_readdir_args *ap) 1357 { 1358 struct vnode *vp; 1359 struct mqfs_info *mi; 1360 struct mqfs_node *pd; 1361 struct mqfs_node *pn; 1362 struct dirent entry; 1363 struct uio *uio; 1364 int *tmp_ncookies = NULL; 1365 off_t offset; 1366 int error, i; 1367 1368 vp = ap->a_vp; 1369 mi = VFSTOMQFS(vp->v_mount); 1370 pd = VTON(vp); 1371 uio = ap->a_uio; 1372 1373 if (vp->v_type != VDIR) 1374 return (ENOTDIR); 1375 1376 if (uio->uio_offset < 0) 1377 return (EINVAL); 1378 1379 if (ap->a_ncookies != NULL) { 1380 tmp_ncookies = ap->a_ncookies; 1381 *ap->a_ncookies = 0; 1382 ap->a_ncookies = NULL; 1383 } 1384 1385 error = 0; 1386 offset = 0; 1387 1388 sx_xlock(&mi->mi_lock); 1389 1390 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 1391 entry.d_reclen = sizeof(entry); 1392 if (!pn->mn_fileno) 1393 mqfs_fileno_alloc(mi, pn); 1394 entry.d_fileno = pn->mn_fileno; 1395 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i) 1396 entry.d_name[i] = pn->mn_name[i]; 1397 entry.d_name[i] = 0; 1398 entry.d_namlen = i; 1399 switch (pn->mn_type) { 1400 case mqfstype_root: 1401 case mqfstype_dir: 1402 case mqfstype_this: 1403 case mqfstype_parent: 1404 entry.d_type = DT_DIR; 1405 break; 1406 case mqfstype_file: 1407 entry.d_type = DT_REG; 1408 break; 1409 case mqfstype_symlink: 1410 entry.d_type = DT_LNK; 1411 break; 1412 default: 1413 panic("%s has unexpected node type: %d", pn->mn_name, 1414 pn->mn_type); 1415 } 1416 if (entry.d_reclen > uio->uio_resid) 1417 break; 1418 if (offset >= uio->uio_offset) { 1419 error = vfs_read_dirent(ap, &entry, offset); 1420 if (error) 1421 break; 1422 } 1423 offset += entry.d_reclen; 1424 } 1425 sx_xunlock(&mi->mi_lock); 1426 1427 uio->uio_offset = offset; 1428 1429 if (tmp_ncookies != NULL) 1430 ap->a_ncookies = tmp_ncookies; 1431 1432 return (error); 1433 } 1434 1435 #ifdef notyet 1436 1437 #if 0 1438 struct vop_mkdir_args { 1439 struct vnode *a_dvp; 1440 struvt vnode **a_vpp; 1441 struvt componentname *a_cnp; 1442 struct vattr *a_vap; 1443 }; 1444 #endif 1445 1446 /* 1447 * Create a directory. 1448 */ 1449 static int 1450 mqfs_mkdir(struct vop_mkdir_args *ap) 1451 { 1452 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1453 struct componentname *cnp = ap->a_cnp; 1454 struct mqfs_node *pd = VTON(ap->a_dvp); 1455 struct mqfs_node *pn; 1456 int error; 1457 1458 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 1459 return (ENOTDIR); 1460 sx_xlock(&mqfs->mi_lock); 1461 if ((cnp->cn_flags & HASBUF) == 0) 1462 panic("%s: no name", __func__); 1463 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen, 1464 ap->a_vap->cn_cred, ap->a_vap->va_mode); 1465 if (pn != NULL) 1466 mqnode_addref(pn); 1467 sx_xunlock(&mqfs->mi_lock); 1468 if (pn == NULL) { 1469 error = ENOSPC; 1470 } else { 1471 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1472 mqnode_release(pn); 1473 } 1474 return (error); 1475 } 1476 1477 #if 0 1478 struct vop_rmdir_args { 1479 struct vnode *a_dvp; 1480 struct vnode *a_vp; 1481 struct componentname *a_cnp; 1482 }; 1483 #endif 1484 1485 /* 1486 * Remove a directory. 1487 */ 1488 static int 1489 mqfs_rmdir(struct vop_rmdir_args *ap) 1490 { 1491 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1492 struct mqfs_node *pn = VTON(ap->a_vp); 1493 struct mqfs_node *pt; 1494 1495 if (pn->mn_type != mqfstype_dir) 1496 return (ENOTDIR); 1497 1498 sx_xlock(&mqfs->mi_lock); 1499 if (pn->mn_deleted) { 1500 sx_xunlock(&mqfs->mi_lock); 1501 return (ENOENT); 1502 } 1503 1504 pt = LIST_FIRST(&pn->mn_children); 1505 pt = LIST_NEXT(pt, mn_sibling); 1506 pt = LIST_NEXT(pt, mn_sibling); 1507 if (pt != NULL) { 1508 sx_xunlock(&mqfs->mi_lock); 1509 return (ENOTEMPTY); 1510 } 1511 pt = pn->mn_parent; 1512 pn->mn_parent = NULL; 1513 pn->mn_deleted = 1; 1514 LIST_REMOVE(pn, mn_sibling); 1515 mqnode_release(pn); 1516 mqnode_release(pt); 1517 sx_xunlock(&mqfs->mi_lock); 1518 cache_purge(ap->a_vp); 1519 return (0); 1520 } 1521 1522 #endif /* notyet */ 1523 1524 /* 1525 * Allocate a message queue 1526 */ 1527 static struct mqueue * 1528 mqueue_alloc(const struct mq_attr *attr) 1529 { 1530 struct mqueue *mq; 1531 1532 if (curmq >= maxmq) 1533 return (NULL); 1534 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO); 1535 TAILQ_INIT(&mq->mq_msgq); 1536 if (attr != NULL) { 1537 mq->mq_maxmsg = attr->mq_maxmsg; 1538 mq->mq_msgsize = attr->mq_msgsize; 1539 } else { 1540 mq->mq_maxmsg = default_maxmsg; 1541 mq->mq_msgsize = default_msgsize; 1542 } 1543 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF); 1544 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex); 1545 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex); 1546 atomic_add_int(&curmq, 1); 1547 return (mq); 1548 } 1549 1550 /* 1551 * Destroy a message queue 1552 */ 1553 static void 1554 mqueue_free(struct mqueue *mq) 1555 { 1556 struct mqueue_msg *msg; 1557 1558 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) { 1559 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link); 1560 free(msg, M_MQUEUEDATA); 1561 } 1562 1563 mtx_destroy(&mq->mq_mutex); 1564 seldrain(&mq->mq_rsel); 1565 seldrain(&mq->mq_wsel); 1566 knlist_destroy(&mq->mq_rsel.si_note); 1567 knlist_destroy(&mq->mq_wsel.si_note); 1568 uma_zfree(mqueue_zone, mq); 1569 atomic_add_int(&curmq, -1); 1570 } 1571 1572 /* 1573 * Load a message from user space 1574 */ 1575 static struct mqueue_msg * 1576 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio) 1577 { 1578 struct mqueue_msg *msg; 1579 size_t len; 1580 int error; 1581 1582 len = sizeof(struct mqueue_msg) + msg_size; 1583 msg = malloc(len, M_MQUEUEDATA, M_WAITOK); 1584 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg), 1585 msg_size); 1586 if (error) { 1587 free(msg, M_MQUEUEDATA); 1588 msg = NULL; 1589 } else { 1590 msg->msg_size = msg_size; 1591 msg->msg_prio = msg_prio; 1592 } 1593 return (msg); 1594 } 1595 1596 /* 1597 * Save a message to user space 1598 */ 1599 static int 1600 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio) 1601 { 1602 int error; 1603 1604 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr, 1605 msg->msg_size); 1606 if (error == 0 && msg_prio != NULL) 1607 error = copyout(&msg->msg_prio, msg_prio, sizeof(int)); 1608 return (error); 1609 } 1610 1611 /* 1612 * Free a message's memory 1613 */ 1614 static __inline void 1615 mqueue_freemsg(struct mqueue_msg *msg) 1616 { 1617 free(msg, M_MQUEUEDATA); 1618 } 1619 1620 /* 1621 * Send a message. if waitok is false, thread will not be 1622 * blocked if there is no data in queue, otherwise, absolute 1623 * time will be checked. 1624 */ 1625 int 1626 mqueue_send(struct mqueue *mq, const char *msg_ptr, 1627 size_t msg_len, unsigned msg_prio, int waitok, 1628 const struct timespec *abs_timeout) 1629 { 1630 struct mqueue_msg *msg; 1631 struct timespec ts, ts2; 1632 struct timeval tv; 1633 int error; 1634 1635 if (msg_prio >= MQ_PRIO_MAX) 1636 return (EINVAL); 1637 if (msg_len > mq->mq_msgsize) 1638 return (EMSGSIZE); 1639 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio); 1640 if (msg == NULL) 1641 return (EFAULT); 1642 1643 /* O_NONBLOCK case */ 1644 if (!waitok) { 1645 error = _mqueue_send(mq, msg, -1); 1646 if (error) 1647 goto bad; 1648 return (0); 1649 } 1650 1651 /* we allow a null timeout (wait forever) */ 1652 if (abs_timeout == NULL) { 1653 error = _mqueue_send(mq, msg, 0); 1654 if (error) 1655 goto bad; 1656 return (0); 1657 } 1658 1659 /* send it before checking time */ 1660 error = _mqueue_send(mq, msg, -1); 1661 if (error == 0) 1662 return (0); 1663 1664 if (error != EAGAIN) 1665 goto bad; 1666 1667 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1668 error = EINVAL; 1669 goto bad; 1670 } 1671 for (;;) { 1672 ts2 = *abs_timeout; 1673 getnanotime(&ts); 1674 timespecsub(&ts2, &ts); 1675 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1676 error = ETIMEDOUT; 1677 break; 1678 } 1679 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1680 error = _mqueue_send(mq, msg, tvtohz(&tv)); 1681 if (error != ETIMEDOUT) 1682 break; 1683 } 1684 if (error == 0) 1685 return (0); 1686 bad: 1687 mqueue_freemsg(msg); 1688 return (error); 1689 } 1690 1691 /* 1692 * Common routine to send a message 1693 */ 1694 static int 1695 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo) 1696 { 1697 struct mqueue_msg *msg2; 1698 int error = 0; 1699 1700 mtx_lock(&mq->mq_mutex); 1701 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) { 1702 if (timo < 0) { 1703 mtx_unlock(&mq->mq_mutex); 1704 return (EAGAIN); 1705 } 1706 mq->mq_senders++; 1707 error = msleep(&mq->mq_senders, &mq->mq_mutex, 1708 PCATCH, "mqsend", timo); 1709 mq->mq_senders--; 1710 if (error == EAGAIN) 1711 error = ETIMEDOUT; 1712 } 1713 if (mq->mq_curmsgs >= mq->mq_maxmsg) { 1714 mtx_unlock(&mq->mq_mutex); 1715 return (error); 1716 } 1717 error = 0; 1718 if (TAILQ_EMPTY(&mq->mq_msgq)) { 1719 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link); 1720 } else { 1721 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) { 1722 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link); 1723 } else { 1724 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) { 1725 if (msg2->msg_prio < msg->msg_prio) 1726 break; 1727 } 1728 TAILQ_INSERT_BEFORE(msg2, msg, msg_link); 1729 } 1730 } 1731 mq->mq_curmsgs++; 1732 mq->mq_totalbytes += msg->msg_size; 1733 if (mq->mq_receivers) 1734 wakeup_one(&mq->mq_receivers); 1735 else if (mq->mq_notifier != NULL) 1736 mqueue_send_notification(mq); 1737 if (mq->mq_flags & MQ_RSEL) { 1738 mq->mq_flags &= ~MQ_RSEL; 1739 selwakeup(&mq->mq_rsel); 1740 } 1741 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0); 1742 mtx_unlock(&mq->mq_mutex); 1743 return (0); 1744 } 1745 1746 /* 1747 * Send realtime a signal to process which registered itself 1748 * successfully by mq_notify. 1749 */ 1750 static void 1751 mqueue_send_notification(struct mqueue *mq) 1752 { 1753 struct mqueue_notifier *nt; 1754 struct thread *td; 1755 struct proc *p; 1756 int error; 1757 1758 mtx_assert(&mq->mq_mutex, MA_OWNED); 1759 nt = mq->mq_notifier; 1760 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) { 1761 p = nt->nt_proc; 1762 error = sigev_findtd(p, &nt->nt_sigev, &td); 1763 if (error) { 1764 mq->mq_notifier = NULL; 1765 return; 1766 } 1767 if (!KSI_ONQ(&nt->nt_ksi)) { 1768 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev); 1769 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi); 1770 } 1771 PROC_UNLOCK(p); 1772 } 1773 mq->mq_notifier = NULL; 1774 } 1775 1776 /* 1777 * Get a message. if waitok is false, thread will not be 1778 * blocked if there is no data in queue, otherwise, absolute 1779 * time will be checked. 1780 */ 1781 int 1782 mqueue_receive(struct mqueue *mq, char *msg_ptr, 1783 size_t msg_len, unsigned *msg_prio, int waitok, 1784 const struct timespec *abs_timeout) 1785 { 1786 struct mqueue_msg *msg; 1787 struct timespec ts, ts2; 1788 struct timeval tv; 1789 int error; 1790 1791 if (msg_len < mq->mq_msgsize) 1792 return (EMSGSIZE); 1793 1794 /* O_NONBLOCK case */ 1795 if (!waitok) { 1796 error = _mqueue_recv(mq, &msg, -1); 1797 if (error) 1798 return (error); 1799 goto received; 1800 } 1801 1802 /* we allow a null timeout (wait forever). */ 1803 if (abs_timeout == NULL) { 1804 error = _mqueue_recv(mq, &msg, 0); 1805 if (error) 1806 return (error); 1807 goto received; 1808 } 1809 1810 /* try to get a message before checking time */ 1811 error = _mqueue_recv(mq, &msg, -1); 1812 if (error == 0) 1813 goto received; 1814 1815 if (error != EAGAIN) 1816 return (error); 1817 1818 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1819 error = EINVAL; 1820 return (error); 1821 } 1822 1823 for (;;) { 1824 ts2 = *abs_timeout; 1825 getnanotime(&ts); 1826 timespecsub(&ts2, &ts); 1827 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1828 error = ETIMEDOUT; 1829 return (error); 1830 } 1831 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1832 error = _mqueue_recv(mq, &msg, tvtohz(&tv)); 1833 if (error == 0) 1834 break; 1835 if (error != ETIMEDOUT) 1836 return (error); 1837 } 1838 1839 received: 1840 error = mqueue_savemsg(msg, msg_ptr, msg_prio); 1841 if (error == 0) { 1842 curthread->td_retval[0] = msg->msg_size; 1843 curthread->td_retval[1] = 0; 1844 } 1845 mqueue_freemsg(msg); 1846 return (error); 1847 } 1848 1849 /* 1850 * Common routine to receive a message 1851 */ 1852 static int 1853 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo) 1854 { 1855 int error = 0; 1856 1857 mtx_lock(&mq->mq_mutex); 1858 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) { 1859 if (timo < 0) { 1860 mtx_unlock(&mq->mq_mutex); 1861 return (EAGAIN); 1862 } 1863 mq->mq_receivers++; 1864 error = msleep(&mq->mq_receivers, &mq->mq_mutex, 1865 PCATCH, "mqrecv", timo); 1866 mq->mq_receivers--; 1867 if (error == EAGAIN) 1868 error = ETIMEDOUT; 1869 } 1870 if (*msg != NULL) { 1871 error = 0; 1872 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link); 1873 mq->mq_curmsgs--; 1874 mq->mq_totalbytes -= (*msg)->msg_size; 1875 if (mq->mq_senders) 1876 wakeup_one(&mq->mq_senders); 1877 if (mq->mq_flags & MQ_WSEL) { 1878 mq->mq_flags &= ~MQ_WSEL; 1879 selwakeup(&mq->mq_wsel); 1880 } 1881 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0); 1882 } 1883 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 && 1884 !TAILQ_EMPTY(&mq->mq_msgq)) { 1885 mqueue_send_notification(mq); 1886 } 1887 mtx_unlock(&mq->mq_mutex); 1888 return (error); 1889 } 1890 1891 static __inline struct mqueue_notifier * 1892 notifier_alloc(void) 1893 { 1894 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO)); 1895 } 1896 1897 static __inline void 1898 notifier_free(struct mqueue_notifier *p) 1899 { 1900 uma_zfree(mqnoti_zone, p); 1901 } 1902 1903 static struct mqueue_notifier * 1904 notifier_search(struct proc *p, int fd) 1905 { 1906 struct mqueue_notifier *nt; 1907 1908 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) { 1909 if (nt->nt_ksi.ksi_mqd == fd) 1910 break; 1911 } 1912 return (nt); 1913 } 1914 1915 static __inline void 1916 notifier_insert(struct proc *p, struct mqueue_notifier *nt) 1917 { 1918 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link); 1919 } 1920 1921 static __inline void 1922 notifier_delete(struct proc *p, struct mqueue_notifier *nt) 1923 { 1924 LIST_REMOVE(nt, nt_link); 1925 notifier_free(nt); 1926 } 1927 1928 static void 1929 notifier_remove(struct proc *p, struct mqueue *mq, int fd) 1930 { 1931 struct mqueue_notifier *nt; 1932 1933 mtx_assert(&mq->mq_mutex, MA_OWNED); 1934 PROC_LOCK(p); 1935 nt = notifier_search(p, fd); 1936 if (nt != NULL) { 1937 if (mq->mq_notifier == nt) 1938 mq->mq_notifier = NULL; 1939 sigqueue_take(&nt->nt_ksi); 1940 notifier_delete(p, nt); 1941 } 1942 PROC_UNLOCK(p); 1943 } 1944 1945 static int 1946 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode, 1947 const struct mq_attr *attr) 1948 { 1949 char path[MQFS_NAMELEN + 1]; 1950 struct mqfs_node *pn; 1951 struct filedesc *fdp; 1952 struct file *fp; 1953 struct mqueue *mq; 1954 int fd, error, len, cmode; 1955 1956 fdp = td->td_proc->p_fd; 1957 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT); 1958 mq = NULL; 1959 if ((flags & O_CREAT) != 0 && attr != NULL) { 1960 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg) 1961 return (EINVAL); 1962 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize) 1963 return (EINVAL); 1964 } 1965 1966 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL); 1967 if (error) 1968 return (error); 1969 1970 /* 1971 * The first character of name must be a slash (/) character 1972 * and the remaining characters of name cannot include any slash 1973 * characters. 1974 */ 1975 len = strlen(path); 1976 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 1977 return (EINVAL); 1978 1979 error = falloc(td, &fp, &fd, 0); 1980 if (error) 1981 return (error); 1982 1983 sx_xlock(&mqfs_data.mi_lock); 1984 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1); 1985 if (pn == NULL) { 1986 if (!(flags & O_CREAT)) { 1987 error = ENOENT; 1988 } else { 1989 mq = mqueue_alloc(attr); 1990 if (mq == NULL) { 1991 error = ENFILE; 1992 } else { 1993 pn = mqfs_create_file(mqfs_data.mi_root, 1994 path + 1, len - 1, td->td_ucred, 1995 cmode); 1996 if (pn == NULL) { 1997 error = ENOSPC; 1998 mqueue_free(mq); 1999 } 2000 } 2001 } 2002 2003 if (error == 0) { 2004 pn->mn_data = mq; 2005 } 2006 } else { 2007 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) { 2008 error = EEXIST; 2009 } else { 2010 accmode_t accmode = 0; 2011 2012 if (flags & FREAD) 2013 accmode |= VREAD; 2014 if (flags & FWRITE) 2015 accmode |= VWRITE; 2016 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, 2017 pn->mn_gid, accmode, td->td_ucred, NULL); 2018 } 2019 } 2020 2021 if (error) { 2022 sx_xunlock(&mqfs_data.mi_lock); 2023 fdclose(fdp, fp, fd, td); 2024 fdrop(fp, td); 2025 return (error); 2026 } 2027 2028 mqnode_addref(pn); 2029 sx_xunlock(&mqfs_data.mi_lock); 2030 2031 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn, 2032 &mqueueops); 2033 2034 FILEDESC_XLOCK(fdp); 2035 if (fdp->fd_ofiles[fd] == fp) 2036 fdp->fd_ofileflags[fd] |= UF_EXCLOSE; 2037 FILEDESC_XUNLOCK(fdp); 2038 td->td_retval[0] = fd; 2039 fdrop(fp, td); 2040 return (0); 2041 } 2042 2043 /* 2044 * Syscall to open a message queue. 2045 */ 2046 int 2047 sys_kmq_open(struct thread *td, struct kmq_open_args *uap) 2048 { 2049 struct mq_attr attr; 2050 int flags, error; 2051 2052 if ((uap->flags & O_ACCMODE) == O_ACCMODE) 2053 return (EINVAL); 2054 flags = FFLAGS(uap->flags); 2055 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2056 error = copyin(uap->attr, &attr, sizeof(attr)); 2057 if (error) 2058 return (error); 2059 } 2060 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2061 uap->attr != NULL ? &attr : NULL)); 2062 } 2063 2064 /* 2065 * Syscall to unlink a message queue. 2066 */ 2067 int 2068 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap) 2069 { 2070 char path[MQFS_NAMELEN+1]; 2071 struct mqfs_node *pn; 2072 int error, len; 2073 2074 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL); 2075 if (error) 2076 return (error); 2077 2078 len = strlen(path); 2079 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 2080 return (EINVAL); 2081 2082 sx_xlock(&mqfs_data.mi_lock); 2083 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1); 2084 if (pn != NULL) 2085 error = do_unlink(pn, td->td_ucred); 2086 else 2087 error = ENOENT; 2088 sx_xunlock(&mqfs_data.mi_lock); 2089 return (error); 2090 } 2091 2092 typedef int (*_fgetf)(struct thread *, int, cap_rights_t, struct file **); 2093 2094 /* 2095 * Get message queue by giving file slot 2096 */ 2097 static int 2098 _getmq(struct thread *td, int fd, cap_rights_t rights, _fgetf func, 2099 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq) 2100 { 2101 struct mqfs_node *pn; 2102 int error; 2103 2104 error = func(td, fd, rights, fpp); 2105 if (error) 2106 return (error); 2107 if (&mqueueops != (*fpp)->f_ops) { 2108 fdrop(*fpp, td); 2109 return (EBADF); 2110 } 2111 pn = (*fpp)->f_data; 2112 if (ppn) 2113 *ppn = pn; 2114 if (pmq) 2115 *pmq = pn->mn_data; 2116 return (0); 2117 } 2118 2119 static __inline int 2120 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, 2121 struct mqueue **pmq) 2122 { 2123 return _getmq(td, fd, CAP_POLL_EVENT, fget, fpp, ppn, pmq); 2124 } 2125 2126 static __inline int 2127 getmq_read(struct thread *td, int fd, struct file **fpp, 2128 struct mqfs_node **ppn, struct mqueue **pmq) 2129 { 2130 return _getmq(td, fd, CAP_READ, fget_read, fpp, ppn, pmq); 2131 } 2132 2133 static __inline int 2134 getmq_write(struct thread *td, int fd, struct file **fpp, 2135 struct mqfs_node **ppn, struct mqueue **pmq) 2136 { 2137 return _getmq(td, fd, CAP_WRITE, fget_write, fpp, ppn, pmq); 2138 } 2139 2140 static int 2141 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr, 2142 struct mq_attr *oattr) 2143 { 2144 struct mqueue *mq; 2145 struct file *fp; 2146 u_int oflag, flag; 2147 int error; 2148 2149 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0) 2150 return (EINVAL); 2151 error = getmq(td, mqd, &fp, NULL, &mq); 2152 if (error) 2153 return (error); 2154 oattr->mq_maxmsg = mq->mq_maxmsg; 2155 oattr->mq_msgsize = mq->mq_msgsize; 2156 oattr->mq_curmsgs = mq->mq_curmsgs; 2157 if (attr != NULL) { 2158 do { 2159 oflag = flag = fp->f_flag; 2160 flag &= ~O_NONBLOCK; 2161 flag |= (attr->mq_flags & O_NONBLOCK); 2162 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0); 2163 } else 2164 oflag = fp->f_flag; 2165 oattr->mq_flags = (O_NONBLOCK & oflag); 2166 fdrop(fp, td); 2167 return (error); 2168 } 2169 2170 int 2171 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap) 2172 { 2173 struct mq_attr attr, oattr; 2174 int error; 2175 2176 if (uap->attr != NULL) { 2177 error = copyin(uap->attr, &attr, sizeof(attr)); 2178 if (error != 0) 2179 return (error); 2180 } 2181 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2182 &oattr); 2183 if (error != 0) 2184 return (error); 2185 if (uap->oattr != NULL) 2186 error = copyout(&oattr, uap->oattr, sizeof(oattr)); 2187 return (error); 2188 } 2189 2190 int 2191 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap) 2192 { 2193 struct mqueue *mq; 2194 struct file *fp; 2195 struct timespec *abs_timeout, ets; 2196 int error; 2197 int waitok; 2198 2199 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2200 if (error) 2201 return (error); 2202 if (uap->abs_timeout != NULL) { 2203 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2204 if (error != 0) 2205 return (error); 2206 abs_timeout = &ets; 2207 } else 2208 abs_timeout = NULL; 2209 waitok = !(fp->f_flag & O_NONBLOCK); 2210 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2211 uap->msg_prio, waitok, abs_timeout); 2212 fdrop(fp, td); 2213 return (error); 2214 } 2215 2216 int 2217 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap) 2218 { 2219 struct mqueue *mq; 2220 struct file *fp; 2221 struct timespec *abs_timeout, ets; 2222 int error, waitok; 2223 2224 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2225 if (error) 2226 return (error); 2227 if (uap->abs_timeout != NULL) { 2228 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2229 if (error != 0) 2230 return (error); 2231 abs_timeout = &ets; 2232 } else 2233 abs_timeout = NULL; 2234 waitok = !(fp->f_flag & O_NONBLOCK); 2235 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2236 uap->msg_prio, waitok, abs_timeout); 2237 fdrop(fp, td); 2238 return (error); 2239 } 2240 2241 int 2242 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap) 2243 { 2244 struct sigevent ev; 2245 struct filedesc *fdp; 2246 struct proc *p; 2247 struct mqueue *mq; 2248 struct file *fp, *fp2; 2249 struct mqueue_notifier *nt, *newnt = NULL; 2250 int error; 2251 2252 p = td->td_proc; 2253 fdp = td->td_proc->p_fd; 2254 if (uap->sigev) { 2255 error = copyin(uap->sigev, &ev, sizeof(ev)); 2256 if (error) 2257 return (error); 2258 if (ev.sigev_notify != SIGEV_SIGNAL && 2259 ev.sigev_notify != SIGEV_THREAD_ID && 2260 ev.sigev_notify != SIGEV_NONE) 2261 return (EINVAL); 2262 if ((ev.sigev_notify == SIGEV_SIGNAL || 2263 ev.sigev_notify == SIGEV_THREAD_ID) && 2264 !_SIG_VALID(ev.sigev_signo)) 2265 return (EINVAL); 2266 } 2267 error = getmq(td, uap->mqd, &fp, NULL, &mq); 2268 if (error) 2269 return (error); 2270 again: 2271 FILEDESC_SLOCK(fdp); 2272 fp2 = fget_locked(fdp, uap->mqd); 2273 if (fp2 == NULL) { 2274 FILEDESC_SUNLOCK(fdp); 2275 error = EBADF; 2276 goto out; 2277 } 2278 error = cap_funwrap(fp2, CAP_POLL_EVENT, &fp2); 2279 if (error) { 2280 FILEDESC_SUNLOCK(fdp); 2281 goto out; 2282 } 2283 if (fp2 != fp) { 2284 FILEDESC_SUNLOCK(fdp); 2285 error = EBADF; 2286 goto out; 2287 } 2288 mtx_lock(&mq->mq_mutex); 2289 FILEDESC_SUNLOCK(fdp); 2290 if (uap->sigev != NULL) { 2291 if (mq->mq_notifier != NULL) { 2292 error = EBUSY; 2293 } else { 2294 PROC_LOCK(p); 2295 nt = notifier_search(p, uap->mqd); 2296 if (nt == NULL) { 2297 if (newnt == NULL) { 2298 PROC_UNLOCK(p); 2299 mtx_unlock(&mq->mq_mutex); 2300 newnt = notifier_alloc(); 2301 goto again; 2302 } 2303 } 2304 2305 if (nt != NULL) { 2306 sigqueue_take(&nt->nt_ksi); 2307 if (newnt != NULL) { 2308 notifier_free(newnt); 2309 newnt = NULL; 2310 } 2311 } else { 2312 nt = newnt; 2313 newnt = NULL; 2314 ksiginfo_init(&nt->nt_ksi); 2315 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT; 2316 nt->nt_ksi.ksi_code = SI_MESGQ; 2317 nt->nt_proc = p; 2318 nt->nt_ksi.ksi_mqd = uap->mqd; 2319 notifier_insert(p, nt); 2320 } 2321 nt->nt_sigev = ev; 2322 mq->mq_notifier = nt; 2323 PROC_UNLOCK(p); 2324 /* 2325 * if there is no receivers and message queue 2326 * is not empty, we should send notification 2327 * as soon as possible. 2328 */ 2329 if (mq->mq_receivers == 0 && 2330 !TAILQ_EMPTY(&mq->mq_msgq)) 2331 mqueue_send_notification(mq); 2332 } 2333 } else { 2334 notifier_remove(p, mq, uap->mqd); 2335 } 2336 mtx_unlock(&mq->mq_mutex); 2337 2338 out: 2339 fdrop(fp, td); 2340 if (newnt != NULL) 2341 notifier_free(newnt); 2342 return (error); 2343 } 2344 2345 static void 2346 mqueue_fdclose(struct thread *td, int fd, struct file *fp) 2347 { 2348 struct filedesc *fdp; 2349 struct mqueue *mq; 2350 2351 fdp = td->td_proc->p_fd; 2352 FILEDESC_LOCK_ASSERT(fdp); 2353 2354 if (fp->f_ops == &mqueueops) { 2355 mq = FPTOMQ(fp); 2356 mtx_lock(&mq->mq_mutex); 2357 notifier_remove(td->td_proc, mq, fd); 2358 2359 /* have to wakeup thread in same process */ 2360 if (mq->mq_flags & MQ_RSEL) { 2361 mq->mq_flags &= ~MQ_RSEL; 2362 selwakeup(&mq->mq_rsel); 2363 } 2364 if (mq->mq_flags & MQ_WSEL) { 2365 mq->mq_flags &= ~MQ_WSEL; 2366 selwakeup(&mq->mq_wsel); 2367 } 2368 mtx_unlock(&mq->mq_mutex); 2369 } 2370 } 2371 2372 static void 2373 mq_proc_exit(void *arg __unused, struct proc *p) 2374 { 2375 struct filedesc *fdp; 2376 struct file *fp; 2377 struct mqueue *mq; 2378 int i; 2379 2380 fdp = p->p_fd; 2381 FILEDESC_SLOCK(fdp); 2382 for (i = 0; i < fdp->fd_nfiles; ++i) { 2383 fp = fget_locked(fdp, i); 2384 if (fp != NULL && fp->f_ops == &mqueueops) { 2385 mq = FPTOMQ(fp); 2386 mtx_lock(&mq->mq_mutex); 2387 notifier_remove(p, FPTOMQ(fp), i); 2388 mtx_unlock(&mq->mq_mutex); 2389 } 2390 } 2391 FILEDESC_SUNLOCK(fdp); 2392 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left")); 2393 } 2394 2395 static int 2396 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 2397 int flags, struct thread *td) 2398 { 2399 return (EOPNOTSUPP); 2400 } 2401 2402 static int 2403 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 2404 int flags, struct thread *td) 2405 { 2406 return (EOPNOTSUPP); 2407 } 2408 2409 static int 2410 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred, 2411 struct thread *td) 2412 { 2413 2414 return (EINVAL); 2415 } 2416 2417 static int 2418 mqf_ioctl(struct file *fp, u_long cmd, void *data, 2419 struct ucred *active_cred, struct thread *td) 2420 { 2421 return (ENOTTY); 2422 } 2423 2424 static int 2425 mqf_poll(struct file *fp, int events, struct ucred *active_cred, 2426 struct thread *td) 2427 { 2428 struct mqueue *mq = FPTOMQ(fp); 2429 int revents = 0; 2430 2431 mtx_lock(&mq->mq_mutex); 2432 if (events & (POLLIN | POLLRDNORM)) { 2433 if (mq->mq_curmsgs) { 2434 revents |= events & (POLLIN | POLLRDNORM); 2435 } else { 2436 mq->mq_flags |= MQ_RSEL; 2437 selrecord(td, &mq->mq_rsel); 2438 } 2439 } 2440 if (events & POLLOUT) { 2441 if (mq->mq_curmsgs < mq->mq_maxmsg) 2442 revents |= POLLOUT; 2443 else { 2444 mq->mq_flags |= MQ_WSEL; 2445 selrecord(td, &mq->mq_wsel); 2446 } 2447 } 2448 mtx_unlock(&mq->mq_mutex); 2449 return (revents); 2450 } 2451 2452 static int 2453 mqf_close(struct file *fp, struct thread *td) 2454 { 2455 struct mqfs_node *pn; 2456 2457 fp->f_ops = &badfileops; 2458 pn = fp->f_data; 2459 fp->f_data = NULL; 2460 sx_xlock(&mqfs_data.mi_lock); 2461 mqnode_release(pn); 2462 sx_xunlock(&mqfs_data.mi_lock); 2463 return (0); 2464 } 2465 2466 static int 2467 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 2468 struct thread *td) 2469 { 2470 struct mqfs_node *pn = fp->f_data; 2471 2472 bzero(st, sizeof *st); 2473 sx_xlock(&mqfs_data.mi_lock); 2474 st->st_atim = pn->mn_atime; 2475 st->st_mtim = pn->mn_mtime; 2476 st->st_ctim = pn->mn_ctime; 2477 st->st_birthtim = pn->mn_birth; 2478 st->st_uid = pn->mn_uid; 2479 st->st_gid = pn->mn_gid; 2480 st->st_mode = S_IFIFO | pn->mn_mode; 2481 sx_xunlock(&mqfs_data.mi_lock); 2482 return (0); 2483 } 2484 2485 static int 2486 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 2487 struct thread *td) 2488 { 2489 struct mqfs_node *pn; 2490 int error; 2491 2492 error = 0; 2493 pn = fp->f_data; 2494 sx_xlock(&mqfs_data.mi_lock); 2495 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN, 2496 active_cred, NULL); 2497 if (error != 0) 2498 goto out; 2499 pn->mn_mode = mode & ACCESSPERMS; 2500 out: 2501 sx_xunlock(&mqfs_data.mi_lock); 2502 return (error); 2503 } 2504 2505 static int 2506 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 2507 struct thread *td) 2508 { 2509 struct mqfs_node *pn; 2510 int error; 2511 2512 error = 0; 2513 pn = fp->f_data; 2514 sx_xlock(&mqfs_data.mi_lock); 2515 if (uid == (uid_t)-1) 2516 uid = pn->mn_uid; 2517 if (gid == (gid_t)-1) 2518 gid = pn->mn_gid; 2519 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) || 2520 (gid != pn->mn_gid && !groupmember(gid, active_cred))) && 2521 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0))) 2522 goto out; 2523 pn->mn_uid = uid; 2524 pn->mn_gid = gid; 2525 out: 2526 sx_xunlock(&mqfs_data.mi_lock); 2527 return (error); 2528 } 2529 2530 static int 2531 mqf_kqfilter(struct file *fp, struct knote *kn) 2532 { 2533 struct mqueue *mq = FPTOMQ(fp); 2534 int error = 0; 2535 2536 if (kn->kn_filter == EVFILT_READ) { 2537 kn->kn_fop = &mq_rfiltops; 2538 knlist_add(&mq->mq_rsel.si_note, kn, 0); 2539 } else if (kn->kn_filter == EVFILT_WRITE) { 2540 kn->kn_fop = &mq_wfiltops; 2541 knlist_add(&mq->mq_wsel.si_note, kn, 0); 2542 } else 2543 error = EINVAL; 2544 return (error); 2545 } 2546 2547 static void 2548 filt_mqdetach(struct knote *kn) 2549 { 2550 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2551 2552 if (kn->kn_filter == EVFILT_READ) 2553 knlist_remove(&mq->mq_rsel.si_note, kn, 0); 2554 else if (kn->kn_filter == EVFILT_WRITE) 2555 knlist_remove(&mq->mq_wsel.si_note, kn, 0); 2556 else 2557 panic("filt_mqdetach"); 2558 } 2559 2560 static int 2561 filt_mqread(struct knote *kn, long hint) 2562 { 2563 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2564 2565 mtx_assert(&mq->mq_mutex, MA_OWNED); 2566 return (mq->mq_curmsgs != 0); 2567 } 2568 2569 static int 2570 filt_mqwrite(struct knote *kn, long hint) 2571 { 2572 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2573 2574 mtx_assert(&mq->mq_mutex, MA_OWNED); 2575 return (mq->mq_curmsgs < mq->mq_maxmsg); 2576 } 2577 2578 static struct fileops mqueueops = { 2579 .fo_read = mqf_read, 2580 .fo_write = mqf_write, 2581 .fo_truncate = mqf_truncate, 2582 .fo_ioctl = mqf_ioctl, 2583 .fo_poll = mqf_poll, 2584 .fo_kqfilter = mqf_kqfilter, 2585 .fo_stat = mqf_stat, 2586 .fo_chmod = mqf_chmod, 2587 .fo_chown = mqf_chown, 2588 .fo_close = mqf_close 2589 }; 2590 2591 static struct vop_vector mqfs_vnodeops = { 2592 .vop_default = &default_vnodeops, 2593 .vop_access = mqfs_access, 2594 .vop_cachedlookup = mqfs_lookup, 2595 .vop_lookup = vfs_cache_lookup, 2596 .vop_reclaim = mqfs_reclaim, 2597 .vop_create = mqfs_create, 2598 .vop_remove = mqfs_remove, 2599 .vop_inactive = mqfs_inactive, 2600 .vop_open = mqfs_open, 2601 .vop_close = mqfs_close, 2602 .vop_getattr = mqfs_getattr, 2603 .vop_setattr = mqfs_setattr, 2604 .vop_read = mqfs_read, 2605 .vop_write = VOP_EOPNOTSUPP, 2606 .vop_readdir = mqfs_readdir, 2607 .vop_mkdir = VOP_EOPNOTSUPP, 2608 .vop_rmdir = VOP_EOPNOTSUPP 2609 }; 2610 2611 static struct vfsops mqfs_vfsops = { 2612 .vfs_init = mqfs_init, 2613 .vfs_uninit = mqfs_uninit, 2614 .vfs_mount = mqfs_mount, 2615 .vfs_unmount = mqfs_unmount, 2616 .vfs_root = mqfs_root, 2617 .vfs_statfs = mqfs_statfs, 2618 }; 2619 2620 static struct vfsconf mqueuefs_vfsconf = { 2621 .vfc_version = VFS_VERSION, 2622 .vfc_name = "mqueuefs", 2623 .vfc_vfsops = &mqfs_vfsops, 2624 .vfc_typenum = -1, 2625 .vfc_flags = VFCF_SYNTHETIC 2626 }; 2627 2628 static struct syscall_helper_data mq_syscalls[] = { 2629 SYSCALL_INIT_HELPER(kmq_open), 2630 SYSCALL_INIT_HELPER(kmq_setattr), 2631 SYSCALL_INIT_HELPER(kmq_timedsend), 2632 SYSCALL_INIT_HELPER(kmq_timedreceive), 2633 SYSCALL_INIT_HELPER(kmq_notify), 2634 SYSCALL_INIT_HELPER(kmq_unlink), 2635 SYSCALL_INIT_LAST 2636 }; 2637 2638 #ifdef COMPAT_FREEBSD32 2639 #include <compat/freebsd32/freebsd32.h> 2640 #include <compat/freebsd32/freebsd32_proto.h> 2641 #include <compat/freebsd32/freebsd32_syscall.h> 2642 #include <compat/freebsd32/freebsd32_util.h> 2643 2644 static void 2645 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to) 2646 { 2647 2648 to->mq_flags = from->mq_flags; 2649 to->mq_maxmsg = from->mq_maxmsg; 2650 to->mq_msgsize = from->mq_msgsize; 2651 to->mq_curmsgs = from->mq_curmsgs; 2652 } 2653 2654 static void 2655 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to) 2656 { 2657 2658 to->mq_flags = from->mq_flags; 2659 to->mq_maxmsg = from->mq_maxmsg; 2660 to->mq_msgsize = from->mq_msgsize; 2661 to->mq_curmsgs = from->mq_curmsgs; 2662 } 2663 2664 int 2665 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap) 2666 { 2667 struct mq_attr attr; 2668 struct mq_attr32 attr32; 2669 int flags, error; 2670 2671 if ((uap->flags & O_ACCMODE) == O_ACCMODE) 2672 return (EINVAL); 2673 flags = FFLAGS(uap->flags); 2674 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2675 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2676 if (error) 2677 return (error); 2678 mq_attr_from32(&attr32, &attr); 2679 } 2680 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2681 uap->attr != NULL ? &attr : NULL)); 2682 } 2683 2684 int 2685 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap) 2686 { 2687 struct mq_attr attr, oattr; 2688 struct mq_attr32 attr32, oattr32; 2689 int error; 2690 2691 if (uap->attr != NULL) { 2692 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2693 if (error != 0) 2694 return (error); 2695 mq_attr_from32(&attr32, &attr); 2696 } 2697 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2698 &oattr); 2699 if (error != 0) 2700 return (error); 2701 if (uap->oattr != NULL) { 2702 mq_attr_to32(&oattr, &oattr32); 2703 error = copyout(&oattr32, uap->oattr, sizeof(oattr32)); 2704 } 2705 return (error); 2706 } 2707 2708 int 2709 freebsd32_kmq_timedsend(struct thread *td, 2710 struct freebsd32_kmq_timedsend_args *uap) 2711 { 2712 struct mqueue *mq; 2713 struct file *fp; 2714 struct timespec32 ets32; 2715 struct timespec *abs_timeout, ets; 2716 int error; 2717 int waitok; 2718 2719 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2720 if (error) 2721 return (error); 2722 if (uap->abs_timeout != NULL) { 2723 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2724 if (error != 0) 2725 return (error); 2726 CP(ets32, ets, tv_sec); 2727 CP(ets32, ets, tv_nsec); 2728 abs_timeout = &ets; 2729 } else 2730 abs_timeout = NULL; 2731 waitok = !(fp->f_flag & O_NONBLOCK); 2732 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2733 uap->msg_prio, waitok, abs_timeout); 2734 fdrop(fp, td); 2735 return (error); 2736 } 2737 2738 int 2739 freebsd32_kmq_timedreceive(struct thread *td, 2740 struct freebsd32_kmq_timedreceive_args *uap) 2741 { 2742 struct mqueue *mq; 2743 struct file *fp; 2744 struct timespec32 ets32; 2745 struct timespec *abs_timeout, ets; 2746 int error, waitok; 2747 2748 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2749 if (error) 2750 return (error); 2751 if (uap->abs_timeout != NULL) { 2752 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2753 if (error != 0) 2754 return (error); 2755 CP(ets32, ets, tv_sec); 2756 CP(ets32, ets, tv_nsec); 2757 abs_timeout = &ets; 2758 } else 2759 abs_timeout = NULL; 2760 waitok = !(fp->f_flag & O_NONBLOCK); 2761 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2762 uap->msg_prio, waitok, abs_timeout); 2763 fdrop(fp, td); 2764 return (error); 2765 } 2766 2767 static struct syscall_helper_data mq32_syscalls[] = { 2768 SYSCALL32_INIT_HELPER(freebsd32_kmq_open), 2769 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr), 2770 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend), 2771 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive), 2772 SYSCALL32_INIT_HELPER_COMPAT(kmq_notify), 2773 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink), 2774 SYSCALL_INIT_LAST 2775 }; 2776 #endif 2777 2778 static int 2779 mqinit(void) 2780 { 2781 int error; 2782 2783 error = syscall_helper_register(mq_syscalls); 2784 if (error != 0) 2785 return (error); 2786 #ifdef COMPAT_FREEBSD32 2787 error = syscall32_helper_register(mq32_syscalls); 2788 if (error != 0) 2789 return (error); 2790 #endif 2791 return (0); 2792 } 2793 2794 static int 2795 mqunload(void) 2796 { 2797 2798 #ifdef COMPAT_FREEBSD32 2799 syscall32_helper_unregister(mq32_syscalls); 2800 #endif 2801 syscall_helper_unregister(mq_syscalls); 2802 return (0); 2803 } 2804 2805 static int 2806 mq_modload(struct module *module, int cmd, void *arg) 2807 { 2808 int error = 0; 2809 2810 error = vfs_modevent(module, cmd, arg); 2811 if (error != 0) 2812 return (error); 2813 2814 switch (cmd) { 2815 case MOD_LOAD: 2816 error = mqinit(); 2817 if (error != 0) 2818 mqunload(); 2819 break; 2820 case MOD_UNLOAD: 2821 error = mqunload(); 2822 break; 2823 default: 2824 break; 2825 } 2826 return (error); 2827 } 2828 2829 static moduledata_t mqueuefs_mod = { 2830 "mqueuefs", 2831 mq_modload, 2832 &mqueuefs_vfsconf 2833 }; 2834 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE); 2835 MODULE_VERSION(mqueuefs, 1); 2836