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/malloc.h> 56 #include <sys/buf.h> 57 #include <sys/capsicum.h> 58 #include <sys/dirent.h> 59 #include <sys/event.h> 60 #include <sys/eventhandler.h> 61 #include <sys/fcntl.h> 62 #include <sys/file.h> 63 #include <sys/filedesc.h> 64 #include <sys/jail.h> 65 #include <sys/lock.h> 66 #include <sys/module.h> 67 #include <sys/mount.h> 68 #include <sys/mqueue.h> 69 #include <sys/mutex.h> 70 #include <sys/namei.h> 71 #include <sys/posix4.h> 72 #include <sys/poll.h> 73 #include <sys/priv.h> 74 #include <sys/proc.h> 75 #include <sys/queue.h> 76 #include <sys/sysproto.h> 77 #include <sys/stat.h> 78 #include <sys/syscall.h> 79 #include <sys/syscallsubr.h> 80 #include <sys/sysent.h> 81 #include <sys/sx.h> 82 #include <sys/sysctl.h> 83 #include <sys/taskqueue.h> 84 #include <sys/unistd.h> 85 #include <sys/user.h> 86 #include <sys/vnode.h> 87 #include <machine/atomic.h> 88 89 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support"); 90 91 /* 92 * Limits and constants 93 */ 94 #define MQFS_NAMELEN NAME_MAX 95 #define MQFS_DELEN (8 + MQFS_NAMELEN) 96 97 /* node types */ 98 typedef enum { 99 mqfstype_none = 0, 100 mqfstype_root, 101 mqfstype_dir, 102 mqfstype_this, 103 mqfstype_parent, 104 mqfstype_file, 105 mqfstype_symlink, 106 } mqfs_type_t; 107 108 struct mqfs_node; 109 110 /* 111 * mqfs_info: describes a mqfs instance 112 */ 113 struct mqfs_info { 114 struct sx mi_lock; 115 struct mqfs_node *mi_root; 116 struct unrhdr *mi_unrhdr; 117 }; 118 119 struct mqfs_vdata { 120 LIST_ENTRY(mqfs_vdata) mv_link; 121 struct mqfs_node *mv_node; 122 struct vnode *mv_vnode; 123 struct task mv_task; 124 }; 125 126 /* 127 * mqfs_node: describes a node (file or directory) within a mqfs 128 */ 129 struct mqfs_node { 130 char mn_name[MQFS_NAMELEN+1]; 131 struct mqfs_info *mn_info; 132 struct mqfs_node *mn_parent; 133 LIST_HEAD(,mqfs_node) mn_children; 134 LIST_ENTRY(mqfs_node) mn_sibling; 135 LIST_HEAD(,mqfs_vdata) mn_vnodes; 136 const void *mn_pr_root; 137 int mn_refcount; 138 mqfs_type_t mn_type; 139 int mn_deleted; 140 uint32_t mn_fileno; 141 void *mn_data; 142 struct timespec mn_birth; 143 struct timespec mn_ctime; 144 struct timespec mn_atime; 145 struct timespec mn_mtime; 146 uid_t mn_uid; 147 gid_t mn_gid; 148 int mn_mode; 149 }; 150 151 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node) 152 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data)) 153 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data)) 154 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \ 155 (fp)->f_data)->mn_data)) 156 157 TAILQ_HEAD(msgq, mqueue_msg); 158 159 struct mqueue; 160 161 struct mqueue_notifier { 162 LIST_ENTRY(mqueue_notifier) nt_link; 163 struct sigevent nt_sigev; 164 ksiginfo_t nt_ksi; 165 struct proc *nt_proc; 166 }; 167 168 struct mqueue { 169 struct mtx mq_mutex; 170 int mq_flags; 171 long mq_maxmsg; 172 long mq_msgsize; 173 long mq_curmsgs; 174 long mq_totalbytes; 175 struct msgq mq_msgq; 176 int mq_receivers; 177 int mq_senders; 178 struct selinfo mq_rsel; 179 struct selinfo mq_wsel; 180 struct mqueue_notifier *mq_notifier; 181 }; 182 183 #define MQ_RSEL 0x01 184 #define MQ_WSEL 0x02 185 186 struct mqueue_msg { 187 TAILQ_ENTRY(mqueue_msg) msg_link; 188 unsigned int msg_prio; 189 unsigned int msg_size; 190 /* following real data... */ 191 }; 192 193 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0, 194 "POSIX real time message queue"); 195 196 static int default_maxmsg = 10; 197 static int default_msgsize = 1024; 198 199 static int maxmsg = 100; 200 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW, 201 &maxmsg, 0, "Default maximum messages in queue"); 202 static int maxmsgsize = 16384; 203 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW, 204 &maxmsgsize, 0, "Default maximum message size"); 205 static int maxmq = 100; 206 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW, 207 &maxmq, 0, "maximum message queues"); 208 static int curmq = 0; 209 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW, 210 &curmq, 0, "current message queue number"); 211 static int unloadable = 0; 212 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data"); 213 214 static eventhandler_tag exit_tag; 215 216 /* Only one instance per-system */ 217 static struct mqfs_info mqfs_data; 218 static uma_zone_t mqnode_zone; 219 static uma_zone_t mqueue_zone; 220 static uma_zone_t mvdata_zone; 221 static uma_zone_t mqnoti_zone; 222 static struct vop_vector mqfs_vnodeops; 223 static struct fileops mqueueops; 224 static unsigned mqfs_osd_jail_slot; 225 226 /* 227 * Directory structure construction and manipulation 228 */ 229 #ifdef notyet 230 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent, 231 const char *name, int namelen, struct ucred *cred, int mode); 232 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent, 233 const char *name, int namelen, struct ucred *cred, int mode); 234 #endif 235 236 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent, 237 const char *name, int namelen, struct ucred *cred, int mode); 238 static int mqfs_destroy(struct mqfs_node *mn); 239 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn); 240 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn); 241 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn); 242 static int mqfs_prison_remove(void *obj, void *data); 243 244 /* 245 * Message queue construction and maniplation 246 */ 247 static struct mqueue *mqueue_alloc(const struct mq_attr *attr); 248 static void mqueue_free(struct mqueue *mq); 249 static int mqueue_send(struct mqueue *mq, const char *msg_ptr, 250 size_t msg_len, unsigned msg_prio, int waitok, 251 const struct timespec *abs_timeout); 252 static int mqueue_receive(struct mqueue *mq, char *msg_ptr, 253 size_t msg_len, unsigned *msg_prio, int waitok, 254 const struct timespec *abs_timeout); 255 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, 256 int timo); 257 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, 258 int timo); 259 static void mqueue_send_notification(struct mqueue *mq); 260 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp); 261 static void mq_proc_exit(void *arg, struct proc *p); 262 263 /* 264 * kqueue filters 265 */ 266 static void filt_mqdetach(struct knote *kn); 267 static int filt_mqread(struct knote *kn, long hint); 268 static int filt_mqwrite(struct knote *kn, long hint); 269 270 struct filterops mq_rfiltops = { 271 .f_isfd = 1, 272 .f_detach = filt_mqdetach, 273 .f_event = filt_mqread, 274 }; 275 struct filterops mq_wfiltops = { 276 .f_isfd = 1, 277 .f_detach = filt_mqdetach, 278 .f_event = filt_mqwrite, 279 }; 280 281 /* 282 * Initialize fileno bitmap 283 */ 284 static void 285 mqfs_fileno_init(struct mqfs_info *mi) 286 { 287 struct unrhdr *up; 288 289 up = new_unrhdr(1, INT_MAX, NULL); 290 mi->mi_unrhdr = up; 291 } 292 293 /* 294 * Tear down fileno bitmap 295 */ 296 static void 297 mqfs_fileno_uninit(struct mqfs_info *mi) 298 { 299 struct unrhdr *up; 300 301 up = mi->mi_unrhdr; 302 mi->mi_unrhdr = NULL; 303 delete_unrhdr(up); 304 } 305 306 /* 307 * Allocate a file number 308 */ 309 static void 310 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn) 311 { 312 /* make sure our parent has a file number */ 313 if (mn->mn_parent && !mn->mn_parent->mn_fileno) 314 mqfs_fileno_alloc(mi, mn->mn_parent); 315 316 switch (mn->mn_type) { 317 case mqfstype_root: 318 case mqfstype_dir: 319 case mqfstype_file: 320 case mqfstype_symlink: 321 mn->mn_fileno = alloc_unr(mi->mi_unrhdr); 322 break; 323 case mqfstype_this: 324 KASSERT(mn->mn_parent != NULL, 325 ("mqfstype_this node has no parent")); 326 mn->mn_fileno = mn->mn_parent->mn_fileno; 327 break; 328 case mqfstype_parent: 329 KASSERT(mn->mn_parent != NULL, 330 ("mqfstype_parent node has no parent")); 331 if (mn->mn_parent == mi->mi_root) { 332 mn->mn_fileno = mn->mn_parent->mn_fileno; 333 break; 334 } 335 KASSERT(mn->mn_parent->mn_parent != NULL, 336 ("mqfstype_parent node has no grandparent")); 337 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno; 338 break; 339 default: 340 KASSERT(0, 341 ("mqfs_fileno_alloc() called for unknown type node: %d", 342 mn->mn_type)); 343 break; 344 } 345 } 346 347 /* 348 * Release a file number 349 */ 350 static void 351 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn) 352 { 353 switch (mn->mn_type) { 354 case mqfstype_root: 355 case mqfstype_dir: 356 case mqfstype_file: 357 case mqfstype_symlink: 358 free_unr(mi->mi_unrhdr, mn->mn_fileno); 359 break; 360 case mqfstype_this: 361 case mqfstype_parent: 362 /* ignore these, as they don't "own" their file number */ 363 break; 364 default: 365 KASSERT(0, 366 ("mqfs_fileno_free() called for unknown type node: %d", 367 mn->mn_type)); 368 break; 369 } 370 } 371 372 static __inline struct mqfs_node * 373 mqnode_alloc(void) 374 { 375 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO); 376 } 377 378 static __inline void 379 mqnode_free(struct mqfs_node *node) 380 { 381 uma_zfree(mqnode_zone, node); 382 } 383 384 static __inline void 385 mqnode_addref(struct mqfs_node *node) 386 { 387 atomic_fetchadd_int(&node->mn_refcount, 1); 388 } 389 390 static __inline void 391 mqnode_release(struct mqfs_node *node) 392 { 393 struct mqfs_info *mqfs; 394 int old, exp; 395 396 mqfs = node->mn_info; 397 old = atomic_fetchadd_int(&node->mn_refcount, -1); 398 if (node->mn_type == mqfstype_dir || 399 node->mn_type == mqfstype_root) 400 exp = 3; /* include . and .. */ 401 else 402 exp = 1; 403 if (old == exp) { 404 int locked = sx_xlocked(&mqfs->mi_lock); 405 if (!locked) 406 sx_xlock(&mqfs->mi_lock); 407 mqfs_destroy(node); 408 if (!locked) 409 sx_xunlock(&mqfs->mi_lock); 410 } 411 } 412 413 /* 414 * Add a node to a directory 415 */ 416 static int 417 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node) 418 { 419 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__)); 420 KASSERT(parent->mn_info != NULL, 421 ("%s(): parent has no mn_info", __func__)); 422 KASSERT(parent->mn_type == mqfstype_dir || 423 parent->mn_type == mqfstype_root, 424 ("%s(): parent is not a directory", __func__)); 425 426 node->mn_info = parent->mn_info; 427 node->mn_parent = parent; 428 LIST_INIT(&node->mn_children); 429 LIST_INIT(&node->mn_vnodes); 430 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling); 431 mqnode_addref(parent); 432 return (0); 433 } 434 435 static struct mqfs_node * 436 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode, 437 int nodetype) 438 { 439 struct mqfs_node *node; 440 441 node = mqnode_alloc(); 442 strncpy(node->mn_name, name, namelen); 443 node->mn_pr_root = cred->cr_prison->pr_root; 444 node->mn_type = nodetype; 445 node->mn_refcount = 1; 446 vfs_timestamp(&node->mn_birth); 447 node->mn_ctime = node->mn_atime = node->mn_mtime 448 = node->mn_birth; 449 node->mn_uid = cred->cr_uid; 450 node->mn_gid = cred->cr_gid; 451 node->mn_mode = mode; 452 return (node); 453 } 454 455 /* 456 * Create a file 457 */ 458 static struct mqfs_node * 459 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen, 460 struct ucred *cred, int mode) 461 { 462 struct mqfs_node *node; 463 464 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file); 465 if (mqfs_add_node(parent, node) != 0) { 466 mqnode_free(node); 467 return (NULL); 468 } 469 return (node); 470 } 471 472 /* 473 * Add . and .. to a directory 474 */ 475 static int 476 mqfs_fixup_dir(struct mqfs_node *parent) 477 { 478 struct mqfs_node *dir; 479 480 dir = mqnode_alloc(); 481 dir->mn_name[0] = '.'; 482 dir->mn_type = mqfstype_this; 483 dir->mn_refcount = 1; 484 if (mqfs_add_node(parent, dir) != 0) { 485 mqnode_free(dir); 486 return (-1); 487 } 488 489 dir = mqnode_alloc(); 490 dir->mn_name[0] = dir->mn_name[1] = '.'; 491 dir->mn_type = mqfstype_parent; 492 dir->mn_refcount = 1; 493 494 if (mqfs_add_node(parent, dir) != 0) { 495 mqnode_free(dir); 496 return (-1); 497 } 498 499 return (0); 500 } 501 502 #ifdef notyet 503 504 /* 505 * Create a directory 506 */ 507 static struct mqfs_node * 508 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen, 509 struct ucred *cred, int mode) 510 { 511 struct mqfs_node *node; 512 513 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir); 514 if (mqfs_add_node(parent, node) != 0) { 515 mqnode_free(node); 516 return (NULL); 517 } 518 519 if (mqfs_fixup_dir(node) != 0) { 520 mqfs_destroy(node); 521 return (NULL); 522 } 523 return (node); 524 } 525 526 /* 527 * Create a symlink 528 */ 529 static struct mqfs_node * 530 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen, 531 struct ucred *cred, int mode) 532 { 533 struct mqfs_node *node; 534 535 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink); 536 if (mqfs_add_node(parent, node) != 0) { 537 mqnode_free(node); 538 return (NULL); 539 } 540 return (node); 541 } 542 543 #endif 544 545 /* 546 * Destroy a node or a tree of nodes 547 */ 548 static int 549 mqfs_destroy(struct mqfs_node *node) 550 { 551 struct mqfs_node *parent; 552 553 KASSERT(node != NULL, 554 ("%s(): node is NULL", __func__)); 555 KASSERT(node->mn_info != NULL, 556 ("%s(): node has no mn_info", __func__)); 557 558 /* destroy children */ 559 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root) 560 while (! LIST_EMPTY(&node->mn_children)) 561 mqfs_destroy(LIST_FIRST(&node->mn_children)); 562 563 /* unlink from parent */ 564 if ((parent = node->mn_parent) != NULL) { 565 KASSERT(parent->mn_info == node->mn_info, 566 ("%s(): parent has different mn_info", __func__)); 567 LIST_REMOVE(node, mn_sibling); 568 } 569 570 if (node->mn_fileno != 0) 571 mqfs_fileno_free(node->mn_info, node); 572 if (node->mn_data != NULL) 573 mqueue_free(node->mn_data); 574 mqnode_free(node); 575 return (0); 576 } 577 578 /* 579 * Mount a mqfs instance 580 */ 581 static int 582 mqfs_mount(struct mount *mp) 583 { 584 struct statfs *sbp; 585 586 if (mp->mnt_flag & MNT_UPDATE) 587 return (EOPNOTSUPP); 588 589 mp->mnt_data = &mqfs_data; 590 MNT_ILOCK(mp); 591 mp->mnt_flag |= MNT_LOCAL; 592 MNT_IUNLOCK(mp); 593 vfs_getnewfsid(mp); 594 595 sbp = &mp->mnt_stat; 596 vfs_mountedfrom(mp, "mqueue"); 597 sbp->f_bsize = PAGE_SIZE; 598 sbp->f_iosize = PAGE_SIZE; 599 sbp->f_blocks = 1; 600 sbp->f_bfree = 0; 601 sbp->f_bavail = 0; 602 sbp->f_files = 1; 603 sbp->f_ffree = 0; 604 return (0); 605 } 606 607 /* 608 * Unmount a mqfs instance 609 */ 610 static int 611 mqfs_unmount(struct mount *mp, int mntflags) 612 { 613 int error; 614 615 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0, 616 curthread); 617 return (error); 618 } 619 620 /* 621 * Return a root vnode 622 */ 623 static int 624 mqfs_root(struct mount *mp, int flags, struct vnode **vpp) 625 { 626 struct mqfs_info *mqfs; 627 int ret; 628 629 mqfs = VFSTOMQFS(mp); 630 ret = mqfs_allocv(mp, vpp, mqfs->mi_root); 631 return (ret); 632 } 633 634 /* 635 * Return filesystem stats 636 */ 637 static int 638 mqfs_statfs(struct mount *mp, struct statfs *sbp) 639 { 640 /* XXX update statistics */ 641 return (0); 642 } 643 644 /* 645 * Initialize a mqfs instance 646 */ 647 static int 648 mqfs_init(struct vfsconf *vfc) 649 { 650 struct mqfs_node *root; 651 struct mqfs_info *mi; 652 osd_method_t methods[PR_MAXMETHOD] = { 653 [PR_METHOD_REMOVE] = mqfs_prison_remove, 654 }; 655 656 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node), 657 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 658 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue), 659 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 660 mvdata_zone = uma_zcreate("mvdata", 661 sizeof(struct mqfs_vdata), NULL, NULL, NULL, 662 NULL, UMA_ALIGN_PTR, 0); 663 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier), 664 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 665 mi = &mqfs_data; 666 sx_init(&mi->mi_lock, "mqfs lock"); 667 /* set up the root diretory */ 668 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777, 669 mqfstype_root); 670 root->mn_info = mi; 671 LIST_INIT(&root->mn_children); 672 LIST_INIT(&root->mn_vnodes); 673 mi->mi_root = root; 674 mqfs_fileno_init(mi); 675 mqfs_fileno_alloc(mi, root); 676 mqfs_fixup_dir(root); 677 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL, 678 EVENTHANDLER_PRI_ANY); 679 mq_fdclose = mqueue_fdclose; 680 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); 681 mqfs_osd_jail_slot = osd_jail_register(NULL, methods); 682 return (0); 683 } 684 685 /* 686 * Destroy a mqfs instance 687 */ 688 static int 689 mqfs_uninit(struct vfsconf *vfc) 690 { 691 struct mqfs_info *mi; 692 693 if (!unloadable) 694 return (EOPNOTSUPP); 695 osd_jail_deregister(mqfs_osd_jail_slot); 696 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 697 mi = &mqfs_data; 698 mqfs_destroy(mi->mi_root); 699 mi->mi_root = NULL; 700 mqfs_fileno_uninit(mi); 701 sx_destroy(&mi->mi_lock); 702 uma_zdestroy(mqnode_zone); 703 uma_zdestroy(mqueue_zone); 704 uma_zdestroy(mvdata_zone); 705 uma_zdestroy(mqnoti_zone); 706 return (0); 707 } 708 709 /* 710 * task routine 711 */ 712 static void 713 do_recycle(void *context, int pending __unused) 714 { 715 struct vnode *vp = (struct vnode *)context; 716 717 vrecycle(vp); 718 vdrop(vp); 719 } 720 721 /* 722 * Allocate a vnode 723 */ 724 static int 725 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn) 726 { 727 struct mqfs_vdata *vd; 728 struct mqfs_info *mqfs; 729 struct vnode *newvpp; 730 int error; 731 732 mqfs = pn->mn_info; 733 *vpp = NULL; 734 sx_xlock(&mqfs->mi_lock); 735 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 736 if (vd->mv_vnode->v_mount == mp) { 737 vhold(vd->mv_vnode); 738 break; 739 } 740 } 741 742 if (vd != NULL) { 743 found: 744 *vpp = vd->mv_vnode; 745 sx_xunlock(&mqfs->mi_lock); 746 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread); 747 vdrop(*vpp); 748 return (error); 749 } 750 sx_xunlock(&mqfs->mi_lock); 751 752 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp); 753 if (error) 754 return (error); 755 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY); 756 error = insmntque(newvpp, mp); 757 if (error != 0) 758 return (error); 759 760 sx_xlock(&mqfs->mi_lock); 761 /* 762 * Check if it has already been allocated 763 * while we were blocked. 764 */ 765 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 766 if (vd->mv_vnode->v_mount == mp) { 767 vhold(vd->mv_vnode); 768 sx_xunlock(&mqfs->mi_lock); 769 770 vgone(newvpp); 771 vput(newvpp); 772 goto found; 773 } 774 } 775 776 *vpp = newvpp; 777 778 vd = uma_zalloc(mvdata_zone, M_WAITOK); 779 (*vpp)->v_data = vd; 780 vd->mv_vnode = *vpp; 781 vd->mv_node = pn; 782 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp); 783 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link); 784 mqnode_addref(pn); 785 switch (pn->mn_type) { 786 case mqfstype_root: 787 (*vpp)->v_vflag = VV_ROOT; 788 /* fall through */ 789 case mqfstype_dir: 790 case mqfstype_this: 791 case mqfstype_parent: 792 (*vpp)->v_type = VDIR; 793 break; 794 case mqfstype_file: 795 (*vpp)->v_type = VREG; 796 break; 797 case mqfstype_symlink: 798 (*vpp)->v_type = VLNK; 799 break; 800 case mqfstype_none: 801 KASSERT(0, ("mqfs_allocf called for null node\n")); 802 default: 803 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type); 804 } 805 sx_xunlock(&mqfs->mi_lock); 806 return (0); 807 } 808 809 /* 810 * Search a directory entry 811 */ 812 static struct mqfs_node * 813 mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred) 814 { 815 struct mqfs_node *pn; 816 const void *pr_root; 817 818 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED); 819 pr_root = cred->cr_prison->pr_root; 820 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 821 /* Only match names within the same prison root directory */ 822 if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) && 823 strncmp(pn->mn_name, name, len) == 0 && 824 pn->mn_name[len] == '\0') 825 return (pn); 826 } 827 return (NULL); 828 } 829 830 /* 831 * Look up a file or directory. 832 */ 833 static int 834 mqfs_lookupx(struct vop_cachedlookup_args *ap) 835 { 836 struct componentname *cnp; 837 struct vnode *dvp, **vpp; 838 struct mqfs_node *pd; 839 struct mqfs_node *pn; 840 struct mqfs_info *mqfs; 841 int nameiop, flags, error, namelen; 842 char *pname; 843 struct thread *td; 844 845 cnp = ap->a_cnp; 846 vpp = ap->a_vpp; 847 dvp = ap->a_dvp; 848 pname = cnp->cn_nameptr; 849 namelen = cnp->cn_namelen; 850 td = cnp->cn_thread; 851 flags = cnp->cn_flags; 852 nameiop = cnp->cn_nameiop; 853 pd = VTON(dvp); 854 pn = NULL; 855 mqfs = pd->mn_info; 856 *vpp = NULLVP; 857 858 if (dvp->v_type != VDIR) 859 return (ENOTDIR); 860 861 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 862 if (error) 863 return (error); 864 865 /* shortcut: check if the name is too long */ 866 if (cnp->cn_namelen >= MQFS_NAMELEN) 867 return (ENOENT); 868 869 /* self */ 870 if (namelen == 1 && pname[0] == '.') { 871 if ((flags & ISLASTCN) && nameiop != LOOKUP) 872 return (EINVAL); 873 pn = pd; 874 *vpp = dvp; 875 VREF(dvp); 876 return (0); 877 } 878 879 /* parent */ 880 if (cnp->cn_flags & ISDOTDOT) { 881 if (dvp->v_vflag & VV_ROOT) 882 return (EIO); 883 if ((flags & ISLASTCN) && nameiop != LOOKUP) 884 return (EINVAL); 885 VOP_UNLOCK(dvp, 0); 886 KASSERT(pd->mn_parent, ("non-root directory has no parent")); 887 pn = pd->mn_parent; 888 error = mqfs_allocv(dvp->v_mount, vpp, pn); 889 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 890 return (error); 891 } 892 893 /* named node */ 894 sx_xlock(&mqfs->mi_lock); 895 pn = mqfs_search(pd, pname, namelen, cnp->cn_cred); 896 if (pn != NULL) 897 mqnode_addref(pn); 898 sx_xunlock(&mqfs->mi_lock); 899 900 /* found */ 901 if (pn != NULL) { 902 /* DELETE */ 903 if (nameiop == DELETE && (flags & ISLASTCN)) { 904 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 905 if (error) { 906 mqnode_release(pn); 907 return (error); 908 } 909 if (*vpp == dvp) { 910 VREF(dvp); 911 *vpp = dvp; 912 mqnode_release(pn); 913 return (0); 914 } 915 } 916 917 /* allocate vnode */ 918 error = mqfs_allocv(dvp->v_mount, vpp, pn); 919 mqnode_release(pn); 920 if (error == 0 && cnp->cn_flags & MAKEENTRY) 921 cache_enter(dvp, *vpp, cnp); 922 return (error); 923 } 924 925 /* not found */ 926 927 /* will create a new entry in the directory ? */ 928 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT) 929 && (flags & ISLASTCN)) { 930 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 931 if (error) 932 return (error); 933 cnp->cn_flags |= SAVENAME; 934 return (EJUSTRETURN); 935 } 936 return (ENOENT); 937 } 938 939 #if 0 940 struct vop_lookup_args { 941 struct vop_generic_args a_gen; 942 struct vnode *a_dvp; 943 struct vnode **a_vpp; 944 struct componentname *a_cnp; 945 }; 946 #endif 947 948 /* 949 * vnode lookup operation 950 */ 951 static int 952 mqfs_lookup(struct vop_cachedlookup_args *ap) 953 { 954 int rc; 955 956 rc = mqfs_lookupx(ap); 957 return (rc); 958 } 959 960 #if 0 961 struct vop_create_args { 962 struct vnode *a_dvp; 963 struct vnode **a_vpp; 964 struct componentname *a_cnp; 965 struct vattr *a_vap; 966 }; 967 #endif 968 969 /* 970 * vnode creation operation 971 */ 972 static int 973 mqfs_create(struct vop_create_args *ap) 974 { 975 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 976 struct componentname *cnp = ap->a_cnp; 977 struct mqfs_node *pd; 978 struct mqfs_node *pn; 979 struct mqueue *mq; 980 int error; 981 982 pd = VTON(ap->a_dvp); 983 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 984 return (ENOTDIR); 985 mq = mqueue_alloc(NULL); 986 if (mq == NULL) 987 return (EAGAIN); 988 sx_xlock(&mqfs->mi_lock); 989 if ((cnp->cn_flags & HASBUF) == 0) 990 panic("%s: no name", __func__); 991 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen, 992 cnp->cn_cred, ap->a_vap->va_mode); 993 if (pn == NULL) { 994 sx_xunlock(&mqfs->mi_lock); 995 error = ENOSPC; 996 } else { 997 mqnode_addref(pn); 998 sx_xunlock(&mqfs->mi_lock); 999 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1000 mqnode_release(pn); 1001 if (error) 1002 mqfs_destroy(pn); 1003 else 1004 pn->mn_data = mq; 1005 } 1006 if (error) 1007 mqueue_free(mq); 1008 return (error); 1009 } 1010 1011 /* 1012 * Remove an entry 1013 */ 1014 static 1015 int do_unlink(struct mqfs_node *pn, struct ucred *ucred) 1016 { 1017 struct mqfs_node *parent; 1018 struct mqfs_vdata *vd; 1019 int error = 0; 1020 1021 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED); 1022 1023 if (ucred->cr_uid != pn->mn_uid && 1024 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0) 1025 error = EACCES; 1026 else if (!pn->mn_deleted) { 1027 parent = pn->mn_parent; 1028 pn->mn_parent = NULL; 1029 pn->mn_deleted = 1; 1030 LIST_REMOVE(pn, mn_sibling); 1031 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 1032 cache_purge(vd->mv_vnode); 1033 vhold(vd->mv_vnode); 1034 taskqueue_enqueue(taskqueue_thread, &vd->mv_task); 1035 } 1036 mqnode_release(pn); 1037 mqnode_release(parent); 1038 } else 1039 error = ENOENT; 1040 return (error); 1041 } 1042 1043 #if 0 1044 struct vop_remove_args { 1045 struct vnode *a_dvp; 1046 struct vnode *a_vp; 1047 struct componentname *a_cnp; 1048 }; 1049 #endif 1050 1051 /* 1052 * vnode removal operation 1053 */ 1054 static int 1055 mqfs_remove(struct vop_remove_args *ap) 1056 { 1057 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1058 struct mqfs_node *pn; 1059 int error; 1060 1061 if (ap->a_vp->v_type == VDIR) 1062 return (EPERM); 1063 pn = VTON(ap->a_vp); 1064 sx_xlock(&mqfs->mi_lock); 1065 error = do_unlink(pn, ap->a_cnp->cn_cred); 1066 sx_xunlock(&mqfs->mi_lock); 1067 return (error); 1068 } 1069 1070 #if 0 1071 struct vop_inactive_args { 1072 struct vnode *a_vp; 1073 struct thread *a_td; 1074 }; 1075 #endif 1076 1077 static int 1078 mqfs_inactive(struct vop_inactive_args *ap) 1079 { 1080 struct mqfs_node *pn = VTON(ap->a_vp); 1081 1082 if (pn->mn_deleted) 1083 vrecycle(ap->a_vp); 1084 return (0); 1085 } 1086 1087 #if 0 1088 struct vop_reclaim_args { 1089 struct vop_generic_args a_gen; 1090 struct vnode *a_vp; 1091 struct thread *a_td; 1092 }; 1093 #endif 1094 1095 static int 1096 mqfs_reclaim(struct vop_reclaim_args *ap) 1097 { 1098 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount); 1099 struct vnode *vp = ap->a_vp; 1100 struct mqfs_node *pn; 1101 struct mqfs_vdata *vd; 1102 1103 vd = vp->v_data; 1104 pn = vd->mv_node; 1105 sx_xlock(&mqfs->mi_lock); 1106 vp->v_data = NULL; 1107 LIST_REMOVE(vd, mv_link); 1108 uma_zfree(mvdata_zone, vd); 1109 mqnode_release(pn); 1110 sx_xunlock(&mqfs->mi_lock); 1111 return (0); 1112 } 1113 1114 #if 0 1115 struct vop_open_args { 1116 struct vop_generic_args a_gen; 1117 struct vnode *a_vp; 1118 int a_mode; 1119 struct ucred *a_cred; 1120 struct thread *a_td; 1121 struct file *a_fp; 1122 }; 1123 #endif 1124 1125 static int 1126 mqfs_open(struct vop_open_args *ap) 1127 { 1128 return (0); 1129 } 1130 1131 #if 0 1132 struct vop_close_args { 1133 struct vop_generic_args a_gen; 1134 struct vnode *a_vp; 1135 int a_fflag; 1136 struct ucred *a_cred; 1137 struct thread *a_td; 1138 }; 1139 #endif 1140 1141 static int 1142 mqfs_close(struct vop_close_args *ap) 1143 { 1144 return (0); 1145 } 1146 1147 #if 0 1148 struct vop_access_args { 1149 struct vop_generic_args a_gen; 1150 struct vnode *a_vp; 1151 accmode_t a_accmode; 1152 struct ucred *a_cred; 1153 struct thread *a_td; 1154 }; 1155 #endif 1156 1157 /* 1158 * Verify permissions 1159 */ 1160 static int 1161 mqfs_access(struct vop_access_args *ap) 1162 { 1163 struct vnode *vp = ap->a_vp; 1164 struct vattr vattr; 1165 int error; 1166 1167 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 1168 if (error) 1169 return (error); 1170 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid, 1171 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL); 1172 return (error); 1173 } 1174 1175 #if 0 1176 struct vop_getattr_args { 1177 struct vop_generic_args a_gen; 1178 struct vnode *a_vp; 1179 struct vattr *a_vap; 1180 struct ucred *a_cred; 1181 }; 1182 #endif 1183 1184 /* 1185 * Get file attributes 1186 */ 1187 static int 1188 mqfs_getattr(struct vop_getattr_args *ap) 1189 { 1190 struct vnode *vp = ap->a_vp; 1191 struct mqfs_node *pn = VTON(vp); 1192 struct vattr *vap = ap->a_vap; 1193 int error = 0; 1194 1195 vap->va_type = vp->v_type; 1196 vap->va_mode = pn->mn_mode; 1197 vap->va_nlink = 1; 1198 vap->va_uid = pn->mn_uid; 1199 vap->va_gid = pn->mn_gid; 1200 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 1201 vap->va_fileid = pn->mn_fileno; 1202 vap->va_size = 0; 1203 vap->va_blocksize = PAGE_SIZE; 1204 vap->va_bytes = vap->va_size = 0; 1205 vap->va_atime = pn->mn_atime; 1206 vap->va_mtime = pn->mn_mtime; 1207 vap->va_ctime = pn->mn_ctime; 1208 vap->va_birthtime = pn->mn_birth; 1209 vap->va_gen = 0; 1210 vap->va_flags = 0; 1211 vap->va_rdev = NODEV; 1212 vap->va_bytes = 0; 1213 vap->va_filerev = 0; 1214 return (error); 1215 } 1216 1217 #if 0 1218 struct vop_setattr_args { 1219 struct vop_generic_args a_gen; 1220 struct vnode *a_vp; 1221 struct vattr *a_vap; 1222 struct ucred *a_cred; 1223 }; 1224 #endif 1225 /* 1226 * Set attributes 1227 */ 1228 static int 1229 mqfs_setattr(struct vop_setattr_args *ap) 1230 { 1231 struct mqfs_node *pn; 1232 struct vattr *vap; 1233 struct vnode *vp; 1234 struct thread *td; 1235 int c, error; 1236 uid_t uid; 1237 gid_t gid; 1238 1239 td = curthread; 1240 vap = ap->a_vap; 1241 vp = ap->a_vp; 1242 if ((vap->va_type != VNON) || 1243 (vap->va_nlink != VNOVAL) || 1244 (vap->va_fsid != VNOVAL) || 1245 (vap->va_fileid != VNOVAL) || 1246 (vap->va_blocksize != VNOVAL) || 1247 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1248 (vap->va_rdev != VNOVAL) || 1249 ((int)vap->va_bytes != VNOVAL) || 1250 (vap->va_gen != VNOVAL)) { 1251 return (EINVAL); 1252 } 1253 1254 pn = VTON(vp); 1255 1256 error = c = 0; 1257 if (vap->va_uid == (uid_t)VNOVAL) 1258 uid = pn->mn_uid; 1259 else 1260 uid = vap->va_uid; 1261 if (vap->va_gid == (gid_t)VNOVAL) 1262 gid = pn->mn_gid; 1263 else 1264 gid = vap->va_gid; 1265 1266 if (uid != pn->mn_uid || gid != pn->mn_gid) { 1267 /* 1268 * To modify the ownership of a file, must possess VADMIN 1269 * for that file. 1270 */ 1271 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td))) 1272 return (error); 1273 1274 /* 1275 * XXXRW: Why is there a privilege check here: shouldn't the 1276 * check in VOP_ACCESS() be enough? Also, are the group bits 1277 * below definitely right? 1278 */ 1279 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid || 1280 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) && 1281 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0) 1282 return (error); 1283 pn->mn_uid = uid; 1284 pn->mn_gid = gid; 1285 c = 1; 1286 } 1287 1288 if (vap->va_mode != (mode_t)VNOVAL) { 1289 if ((ap->a_cred->cr_uid != pn->mn_uid) && 1290 (error = priv_check(td, PRIV_MQ_ADMIN))) 1291 return (error); 1292 pn->mn_mode = vap->va_mode; 1293 c = 1; 1294 } 1295 1296 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1297 /* See the comment in ufs_vnops::ufs_setattr(). */ 1298 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) && 1299 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1300 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td)))) 1301 return (error); 1302 if (vap->va_atime.tv_sec != VNOVAL) { 1303 pn->mn_atime = vap->va_atime; 1304 } 1305 if (vap->va_mtime.tv_sec != VNOVAL) { 1306 pn->mn_mtime = vap->va_mtime; 1307 } 1308 c = 1; 1309 } 1310 if (c) { 1311 vfs_timestamp(&pn->mn_ctime); 1312 } 1313 return (0); 1314 } 1315 1316 #if 0 1317 struct vop_read_args { 1318 struct vop_generic_args a_gen; 1319 struct vnode *a_vp; 1320 struct uio *a_uio; 1321 int a_ioflag; 1322 struct ucred *a_cred; 1323 }; 1324 #endif 1325 1326 /* 1327 * Read from a file 1328 */ 1329 static int 1330 mqfs_read(struct vop_read_args *ap) 1331 { 1332 char buf[80]; 1333 struct vnode *vp = ap->a_vp; 1334 struct uio *uio = ap->a_uio; 1335 struct mqfs_node *pn; 1336 struct mqueue *mq; 1337 int len, error; 1338 1339 if (vp->v_type != VREG) 1340 return (EINVAL); 1341 1342 pn = VTON(vp); 1343 mq = VTOMQ(vp); 1344 snprintf(buf, sizeof(buf), 1345 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n", 1346 mq->mq_totalbytes, 1347 mq->mq_maxmsg, 1348 mq->mq_curmsgs, 1349 mq->mq_msgsize); 1350 buf[sizeof(buf)-1] = '\0'; 1351 len = strlen(buf); 1352 error = uiomove_frombuf(buf, len, uio); 1353 return (error); 1354 } 1355 1356 #if 0 1357 struct vop_readdir_args { 1358 struct vop_generic_args a_gen; 1359 struct vnode *a_vp; 1360 struct uio *a_uio; 1361 struct ucred *a_cred; 1362 int *a_eofflag; 1363 int *a_ncookies; 1364 u_long **a_cookies; 1365 }; 1366 #endif 1367 1368 /* 1369 * Return directory entries. 1370 */ 1371 static int 1372 mqfs_readdir(struct vop_readdir_args *ap) 1373 { 1374 struct vnode *vp; 1375 struct mqfs_info *mi; 1376 struct mqfs_node *pd; 1377 struct mqfs_node *pn; 1378 struct dirent entry; 1379 struct uio *uio; 1380 const void *pr_root; 1381 int *tmp_ncookies = NULL; 1382 off_t offset; 1383 int error, i; 1384 1385 vp = ap->a_vp; 1386 mi = VFSTOMQFS(vp->v_mount); 1387 pd = VTON(vp); 1388 uio = ap->a_uio; 1389 1390 if (vp->v_type != VDIR) 1391 return (ENOTDIR); 1392 1393 if (uio->uio_offset < 0) 1394 return (EINVAL); 1395 1396 if (ap->a_ncookies != NULL) { 1397 tmp_ncookies = ap->a_ncookies; 1398 *ap->a_ncookies = 0; 1399 ap->a_ncookies = NULL; 1400 } 1401 1402 error = 0; 1403 offset = 0; 1404 1405 pr_root = ap->a_cred->cr_prison->pr_root; 1406 sx_xlock(&mi->mi_lock); 1407 1408 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 1409 entry.d_reclen = sizeof(entry); 1410 1411 /* 1412 * Only show names within the same prison root directory 1413 * (or not associated with a prison, e.g. "." and ".."). 1414 */ 1415 if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root) 1416 continue; 1417 if (!pn->mn_fileno) 1418 mqfs_fileno_alloc(mi, pn); 1419 entry.d_fileno = pn->mn_fileno; 1420 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i) 1421 entry.d_name[i] = pn->mn_name[i]; 1422 entry.d_name[i] = 0; 1423 entry.d_namlen = i; 1424 switch (pn->mn_type) { 1425 case mqfstype_root: 1426 case mqfstype_dir: 1427 case mqfstype_this: 1428 case mqfstype_parent: 1429 entry.d_type = DT_DIR; 1430 break; 1431 case mqfstype_file: 1432 entry.d_type = DT_REG; 1433 break; 1434 case mqfstype_symlink: 1435 entry.d_type = DT_LNK; 1436 break; 1437 default: 1438 panic("%s has unexpected node type: %d", pn->mn_name, 1439 pn->mn_type); 1440 } 1441 if (entry.d_reclen > uio->uio_resid) 1442 break; 1443 if (offset >= uio->uio_offset) { 1444 error = vfs_read_dirent(ap, &entry, offset); 1445 if (error) 1446 break; 1447 } 1448 offset += entry.d_reclen; 1449 } 1450 sx_xunlock(&mi->mi_lock); 1451 1452 uio->uio_offset = offset; 1453 1454 if (tmp_ncookies != NULL) 1455 ap->a_ncookies = tmp_ncookies; 1456 1457 return (error); 1458 } 1459 1460 #ifdef notyet 1461 1462 #if 0 1463 struct vop_mkdir_args { 1464 struct vnode *a_dvp; 1465 struvt vnode **a_vpp; 1466 struvt componentname *a_cnp; 1467 struct vattr *a_vap; 1468 }; 1469 #endif 1470 1471 /* 1472 * Create a directory. 1473 */ 1474 static int 1475 mqfs_mkdir(struct vop_mkdir_args *ap) 1476 { 1477 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1478 struct componentname *cnp = ap->a_cnp; 1479 struct mqfs_node *pd = VTON(ap->a_dvp); 1480 struct mqfs_node *pn; 1481 int error; 1482 1483 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 1484 return (ENOTDIR); 1485 sx_xlock(&mqfs->mi_lock); 1486 if ((cnp->cn_flags & HASBUF) == 0) 1487 panic("%s: no name", __func__); 1488 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen, 1489 ap->a_vap->cn_cred, ap->a_vap->va_mode); 1490 if (pn != NULL) 1491 mqnode_addref(pn); 1492 sx_xunlock(&mqfs->mi_lock); 1493 if (pn == NULL) { 1494 error = ENOSPC; 1495 } else { 1496 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1497 mqnode_release(pn); 1498 } 1499 return (error); 1500 } 1501 1502 #if 0 1503 struct vop_rmdir_args { 1504 struct vnode *a_dvp; 1505 struct vnode *a_vp; 1506 struct componentname *a_cnp; 1507 }; 1508 #endif 1509 1510 /* 1511 * Remove a directory. 1512 */ 1513 static int 1514 mqfs_rmdir(struct vop_rmdir_args *ap) 1515 { 1516 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1517 struct mqfs_node *pn = VTON(ap->a_vp); 1518 struct mqfs_node *pt; 1519 1520 if (pn->mn_type != mqfstype_dir) 1521 return (ENOTDIR); 1522 1523 sx_xlock(&mqfs->mi_lock); 1524 if (pn->mn_deleted) { 1525 sx_xunlock(&mqfs->mi_lock); 1526 return (ENOENT); 1527 } 1528 1529 pt = LIST_FIRST(&pn->mn_children); 1530 pt = LIST_NEXT(pt, mn_sibling); 1531 pt = LIST_NEXT(pt, mn_sibling); 1532 if (pt != NULL) { 1533 sx_xunlock(&mqfs->mi_lock); 1534 return (ENOTEMPTY); 1535 } 1536 pt = pn->mn_parent; 1537 pn->mn_parent = NULL; 1538 pn->mn_deleted = 1; 1539 LIST_REMOVE(pn, mn_sibling); 1540 mqnode_release(pn); 1541 mqnode_release(pt); 1542 sx_xunlock(&mqfs->mi_lock); 1543 cache_purge(ap->a_vp); 1544 return (0); 1545 } 1546 1547 #endif /* notyet */ 1548 1549 /* 1550 * See if this prison root is obsolete, and clean up associated queues if it is. 1551 */ 1552 static int 1553 mqfs_prison_remove(void *obj, void *data __unused) 1554 { 1555 const struct prison *pr = obj; 1556 const struct prison *tpr; 1557 struct mqfs_node *pn, *tpn; 1558 int found; 1559 1560 found = 0; 1561 TAILQ_FOREACH(tpr, &allprison, pr_list) { 1562 if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0) 1563 found = 1; 1564 } 1565 if (!found) { 1566 /* 1567 * No jails are rooted in this directory anymore, 1568 * so no queues should be either. 1569 */ 1570 sx_xlock(&mqfs_data.mi_lock); 1571 LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children, 1572 mn_sibling, tpn) { 1573 if (pn->mn_pr_root == pr->pr_root) 1574 (void)do_unlink(pn, curthread->td_ucred); 1575 } 1576 sx_xunlock(&mqfs_data.mi_lock); 1577 } 1578 return (0); 1579 } 1580 1581 /* 1582 * Allocate a message queue 1583 */ 1584 static struct mqueue * 1585 mqueue_alloc(const struct mq_attr *attr) 1586 { 1587 struct mqueue *mq; 1588 1589 if (curmq >= maxmq) 1590 return (NULL); 1591 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO); 1592 TAILQ_INIT(&mq->mq_msgq); 1593 if (attr != NULL) { 1594 mq->mq_maxmsg = attr->mq_maxmsg; 1595 mq->mq_msgsize = attr->mq_msgsize; 1596 } else { 1597 mq->mq_maxmsg = default_maxmsg; 1598 mq->mq_msgsize = default_msgsize; 1599 } 1600 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF); 1601 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex); 1602 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex); 1603 atomic_add_int(&curmq, 1); 1604 return (mq); 1605 } 1606 1607 /* 1608 * Destroy a message queue 1609 */ 1610 static void 1611 mqueue_free(struct mqueue *mq) 1612 { 1613 struct mqueue_msg *msg; 1614 1615 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) { 1616 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link); 1617 free(msg, M_MQUEUEDATA); 1618 } 1619 1620 mtx_destroy(&mq->mq_mutex); 1621 seldrain(&mq->mq_rsel); 1622 seldrain(&mq->mq_wsel); 1623 knlist_destroy(&mq->mq_rsel.si_note); 1624 knlist_destroy(&mq->mq_wsel.si_note); 1625 uma_zfree(mqueue_zone, mq); 1626 atomic_add_int(&curmq, -1); 1627 } 1628 1629 /* 1630 * Load a message from user space 1631 */ 1632 static struct mqueue_msg * 1633 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio) 1634 { 1635 struct mqueue_msg *msg; 1636 size_t len; 1637 int error; 1638 1639 len = sizeof(struct mqueue_msg) + msg_size; 1640 msg = malloc(len, M_MQUEUEDATA, M_WAITOK); 1641 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg), 1642 msg_size); 1643 if (error) { 1644 free(msg, M_MQUEUEDATA); 1645 msg = NULL; 1646 } else { 1647 msg->msg_size = msg_size; 1648 msg->msg_prio = msg_prio; 1649 } 1650 return (msg); 1651 } 1652 1653 /* 1654 * Save a message to user space 1655 */ 1656 static int 1657 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio) 1658 { 1659 int error; 1660 1661 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr, 1662 msg->msg_size); 1663 if (error == 0 && msg_prio != NULL) 1664 error = copyout(&msg->msg_prio, msg_prio, sizeof(int)); 1665 return (error); 1666 } 1667 1668 /* 1669 * Free a message's memory 1670 */ 1671 static __inline void 1672 mqueue_freemsg(struct mqueue_msg *msg) 1673 { 1674 free(msg, M_MQUEUEDATA); 1675 } 1676 1677 /* 1678 * Send a message. if waitok is false, thread will not be 1679 * blocked if there is no data in queue, otherwise, absolute 1680 * time will be checked. 1681 */ 1682 int 1683 mqueue_send(struct mqueue *mq, const char *msg_ptr, 1684 size_t msg_len, unsigned msg_prio, int waitok, 1685 const struct timespec *abs_timeout) 1686 { 1687 struct mqueue_msg *msg; 1688 struct timespec ts, ts2; 1689 struct timeval tv; 1690 int error; 1691 1692 if (msg_prio >= MQ_PRIO_MAX) 1693 return (EINVAL); 1694 if (msg_len > mq->mq_msgsize) 1695 return (EMSGSIZE); 1696 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio); 1697 if (msg == NULL) 1698 return (EFAULT); 1699 1700 /* O_NONBLOCK case */ 1701 if (!waitok) { 1702 error = _mqueue_send(mq, msg, -1); 1703 if (error) 1704 goto bad; 1705 return (0); 1706 } 1707 1708 /* we allow a null timeout (wait forever) */ 1709 if (abs_timeout == NULL) { 1710 error = _mqueue_send(mq, msg, 0); 1711 if (error) 1712 goto bad; 1713 return (0); 1714 } 1715 1716 /* send it before checking time */ 1717 error = _mqueue_send(mq, msg, -1); 1718 if (error == 0) 1719 return (0); 1720 1721 if (error != EAGAIN) 1722 goto bad; 1723 1724 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1725 error = EINVAL; 1726 goto bad; 1727 } 1728 for (;;) { 1729 ts2 = *abs_timeout; 1730 getnanotime(&ts); 1731 timespecsub(&ts2, &ts); 1732 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1733 error = ETIMEDOUT; 1734 break; 1735 } 1736 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1737 error = _mqueue_send(mq, msg, tvtohz(&tv)); 1738 if (error != ETIMEDOUT) 1739 break; 1740 } 1741 if (error == 0) 1742 return (0); 1743 bad: 1744 mqueue_freemsg(msg); 1745 return (error); 1746 } 1747 1748 /* 1749 * Common routine to send a message 1750 */ 1751 static int 1752 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo) 1753 { 1754 struct mqueue_msg *msg2; 1755 int error = 0; 1756 1757 mtx_lock(&mq->mq_mutex); 1758 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) { 1759 if (timo < 0) { 1760 mtx_unlock(&mq->mq_mutex); 1761 return (EAGAIN); 1762 } 1763 mq->mq_senders++; 1764 error = msleep(&mq->mq_senders, &mq->mq_mutex, 1765 PCATCH, "mqsend", timo); 1766 mq->mq_senders--; 1767 if (error == EAGAIN) 1768 error = ETIMEDOUT; 1769 } 1770 if (mq->mq_curmsgs >= mq->mq_maxmsg) { 1771 mtx_unlock(&mq->mq_mutex); 1772 return (error); 1773 } 1774 error = 0; 1775 if (TAILQ_EMPTY(&mq->mq_msgq)) { 1776 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link); 1777 } else { 1778 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) { 1779 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link); 1780 } else { 1781 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) { 1782 if (msg2->msg_prio < msg->msg_prio) 1783 break; 1784 } 1785 TAILQ_INSERT_BEFORE(msg2, msg, msg_link); 1786 } 1787 } 1788 mq->mq_curmsgs++; 1789 mq->mq_totalbytes += msg->msg_size; 1790 if (mq->mq_receivers) 1791 wakeup_one(&mq->mq_receivers); 1792 else if (mq->mq_notifier != NULL) 1793 mqueue_send_notification(mq); 1794 if (mq->mq_flags & MQ_RSEL) { 1795 mq->mq_flags &= ~MQ_RSEL; 1796 selwakeup(&mq->mq_rsel); 1797 } 1798 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0); 1799 mtx_unlock(&mq->mq_mutex); 1800 return (0); 1801 } 1802 1803 /* 1804 * Send realtime a signal to process which registered itself 1805 * successfully by mq_notify. 1806 */ 1807 static void 1808 mqueue_send_notification(struct mqueue *mq) 1809 { 1810 struct mqueue_notifier *nt; 1811 struct thread *td; 1812 struct proc *p; 1813 int error; 1814 1815 mtx_assert(&mq->mq_mutex, MA_OWNED); 1816 nt = mq->mq_notifier; 1817 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) { 1818 p = nt->nt_proc; 1819 error = sigev_findtd(p, &nt->nt_sigev, &td); 1820 if (error) { 1821 mq->mq_notifier = NULL; 1822 return; 1823 } 1824 if (!KSI_ONQ(&nt->nt_ksi)) { 1825 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev); 1826 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi); 1827 } 1828 PROC_UNLOCK(p); 1829 } 1830 mq->mq_notifier = NULL; 1831 } 1832 1833 /* 1834 * Get a message. if waitok is false, thread will not be 1835 * blocked if there is no data in queue, otherwise, absolute 1836 * time will be checked. 1837 */ 1838 int 1839 mqueue_receive(struct mqueue *mq, char *msg_ptr, 1840 size_t msg_len, unsigned *msg_prio, int waitok, 1841 const struct timespec *abs_timeout) 1842 { 1843 struct mqueue_msg *msg; 1844 struct timespec ts, ts2; 1845 struct timeval tv; 1846 int error; 1847 1848 if (msg_len < mq->mq_msgsize) 1849 return (EMSGSIZE); 1850 1851 /* O_NONBLOCK case */ 1852 if (!waitok) { 1853 error = _mqueue_recv(mq, &msg, -1); 1854 if (error) 1855 return (error); 1856 goto received; 1857 } 1858 1859 /* we allow a null timeout (wait forever). */ 1860 if (abs_timeout == NULL) { 1861 error = _mqueue_recv(mq, &msg, 0); 1862 if (error) 1863 return (error); 1864 goto received; 1865 } 1866 1867 /* try to get a message before checking time */ 1868 error = _mqueue_recv(mq, &msg, -1); 1869 if (error == 0) 1870 goto received; 1871 1872 if (error != EAGAIN) 1873 return (error); 1874 1875 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) { 1876 error = EINVAL; 1877 return (error); 1878 } 1879 1880 for (;;) { 1881 ts2 = *abs_timeout; 1882 getnanotime(&ts); 1883 timespecsub(&ts2, &ts); 1884 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1885 error = ETIMEDOUT; 1886 return (error); 1887 } 1888 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1889 error = _mqueue_recv(mq, &msg, tvtohz(&tv)); 1890 if (error == 0) 1891 break; 1892 if (error != ETIMEDOUT) 1893 return (error); 1894 } 1895 1896 received: 1897 error = mqueue_savemsg(msg, msg_ptr, msg_prio); 1898 if (error == 0) { 1899 curthread->td_retval[0] = msg->msg_size; 1900 curthread->td_retval[1] = 0; 1901 } 1902 mqueue_freemsg(msg); 1903 return (error); 1904 } 1905 1906 /* 1907 * Common routine to receive a message 1908 */ 1909 static int 1910 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo) 1911 { 1912 int error = 0; 1913 1914 mtx_lock(&mq->mq_mutex); 1915 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) { 1916 if (timo < 0) { 1917 mtx_unlock(&mq->mq_mutex); 1918 return (EAGAIN); 1919 } 1920 mq->mq_receivers++; 1921 error = msleep(&mq->mq_receivers, &mq->mq_mutex, 1922 PCATCH, "mqrecv", timo); 1923 mq->mq_receivers--; 1924 if (error == EAGAIN) 1925 error = ETIMEDOUT; 1926 } 1927 if (*msg != NULL) { 1928 error = 0; 1929 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link); 1930 mq->mq_curmsgs--; 1931 mq->mq_totalbytes -= (*msg)->msg_size; 1932 if (mq->mq_senders) 1933 wakeup_one(&mq->mq_senders); 1934 if (mq->mq_flags & MQ_WSEL) { 1935 mq->mq_flags &= ~MQ_WSEL; 1936 selwakeup(&mq->mq_wsel); 1937 } 1938 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0); 1939 } 1940 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 && 1941 !TAILQ_EMPTY(&mq->mq_msgq)) { 1942 mqueue_send_notification(mq); 1943 } 1944 mtx_unlock(&mq->mq_mutex); 1945 return (error); 1946 } 1947 1948 static __inline struct mqueue_notifier * 1949 notifier_alloc(void) 1950 { 1951 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO)); 1952 } 1953 1954 static __inline void 1955 notifier_free(struct mqueue_notifier *p) 1956 { 1957 uma_zfree(mqnoti_zone, p); 1958 } 1959 1960 static struct mqueue_notifier * 1961 notifier_search(struct proc *p, int fd) 1962 { 1963 struct mqueue_notifier *nt; 1964 1965 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) { 1966 if (nt->nt_ksi.ksi_mqd == fd) 1967 break; 1968 } 1969 return (nt); 1970 } 1971 1972 static __inline void 1973 notifier_insert(struct proc *p, struct mqueue_notifier *nt) 1974 { 1975 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link); 1976 } 1977 1978 static __inline void 1979 notifier_delete(struct proc *p, struct mqueue_notifier *nt) 1980 { 1981 LIST_REMOVE(nt, nt_link); 1982 notifier_free(nt); 1983 } 1984 1985 static void 1986 notifier_remove(struct proc *p, struct mqueue *mq, int fd) 1987 { 1988 struct mqueue_notifier *nt; 1989 1990 mtx_assert(&mq->mq_mutex, MA_OWNED); 1991 PROC_LOCK(p); 1992 nt = notifier_search(p, fd); 1993 if (nt != NULL) { 1994 if (mq->mq_notifier == nt) 1995 mq->mq_notifier = NULL; 1996 sigqueue_take(&nt->nt_ksi); 1997 notifier_delete(p, nt); 1998 } 1999 PROC_UNLOCK(p); 2000 } 2001 2002 static int 2003 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode, 2004 const struct mq_attr *attr) 2005 { 2006 char path[MQFS_NAMELEN + 1]; 2007 struct mqfs_node *pn; 2008 struct filedesc *fdp; 2009 struct file *fp; 2010 struct mqueue *mq; 2011 int fd, error, len, cmode; 2012 2013 fdp = td->td_proc->p_fd; 2014 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT); 2015 mq = NULL; 2016 if ((flags & O_CREAT) != 0 && attr != NULL) { 2017 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg) 2018 return (EINVAL); 2019 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize) 2020 return (EINVAL); 2021 } 2022 2023 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL); 2024 if (error) 2025 return (error); 2026 2027 /* 2028 * The first character of name must be a slash (/) character 2029 * and the remaining characters of name cannot include any slash 2030 * characters. 2031 */ 2032 len = strlen(path); 2033 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 2034 return (EINVAL); 2035 2036 error = falloc(td, &fp, &fd, O_CLOEXEC); 2037 if (error) 2038 return (error); 2039 2040 sx_xlock(&mqfs_data.mi_lock); 2041 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred); 2042 if (pn == NULL) { 2043 if (!(flags & O_CREAT)) { 2044 error = ENOENT; 2045 } else { 2046 mq = mqueue_alloc(attr); 2047 if (mq == NULL) { 2048 error = ENFILE; 2049 } else { 2050 pn = mqfs_create_file(mqfs_data.mi_root, 2051 path + 1, len - 1, td->td_ucred, 2052 cmode); 2053 if (pn == NULL) { 2054 error = ENOSPC; 2055 mqueue_free(mq); 2056 } 2057 } 2058 } 2059 2060 if (error == 0) { 2061 pn->mn_data = mq; 2062 } 2063 } else { 2064 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) { 2065 error = EEXIST; 2066 } else { 2067 accmode_t accmode = 0; 2068 2069 if (flags & FREAD) 2070 accmode |= VREAD; 2071 if (flags & FWRITE) 2072 accmode |= VWRITE; 2073 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, 2074 pn->mn_gid, accmode, td->td_ucred, NULL); 2075 } 2076 } 2077 2078 if (error) { 2079 sx_xunlock(&mqfs_data.mi_lock); 2080 fdclose(td, fp, fd); 2081 fdrop(fp, td); 2082 return (error); 2083 } 2084 2085 mqnode_addref(pn); 2086 sx_xunlock(&mqfs_data.mi_lock); 2087 2088 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn, 2089 &mqueueops); 2090 2091 td->td_retval[0] = fd; 2092 fdrop(fp, td); 2093 return (0); 2094 } 2095 2096 /* 2097 * Syscall to open a message queue. 2098 */ 2099 int 2100 sys_kmq_open(struct thread *td, struct kmq_open_args *uap) 2101 { 2102 struct mq_attr attr; 2103 int flags, error; 2104 2105 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC) 2106 return (EINVAL); 2107 flags = FFLAGS(uap->flags); 2108 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2109 error = copyin(uap->attr, &attr, sizeof(attr)); 2110 if (error) 2111 return (error); 2112 } 2113 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2114 uap->attr != NULL ? &attr : NULL)); 2115 } 2116 2117 /* 2118 * Syscall to unlink a message queue. 2119 */ 2120 int 2121 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap) 2122 { 2123 char path[MQFS_NAMELEN+1]; 2124 struct mqfs_node *pn; 2125 int error, len; 2126 2127 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL); 2128 if (error) 2129 return (error); 2130 2131 len = strlen(path); 2132 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL) 2133 return (EINVAL); 2134 2135 sx_xlock(&mqfs_data.mi_lock); 2136 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred); 2137 if (pn != NULL) 2138 error = do_unlink(pn, td->td_ucred); 2139 else 2140 error = ENOENT; 2141 sx_xunlock(&mqfs_data.mi_lock); 2142 return (error); 2143 } 2144 2145 typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **); 2146 2147 /* 2148 * Get message queue by giving file slot 2149 */ 2150 static int 2151 _getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func, 2152 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq) 2153 { 2154 struct mqfs_node *pn; 2155 int error; 2156 2157 error = func(td, fd, rightsp, fpp); 2158 if (error) 2159 return (error); 2160 if (&mqueueops != (*fpp)->f_ops) { 2161 fdrop(*fpp, td); 2162 return (EBADF); 2163 } 2164 pn = (*fpp)->f_data; 2165 if (ppn) 2166 *ppn = pn; 2167 if (pmq) 2168 *pmq = pn->mn_data; 2169 return (0); 2170 } 2171 2172 static __inline int 2173 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, 2174 struct mqueue **pmq) 2175 { 2176 cap_rights_t rights; 2177 2178 return _getmq(td, fd, cap_rights_init(&rights, CAP_EVENT), fget, 2179 fpp, ppn, pmq); 2180 } 2181 2182 static __inline int 2183 getmq_read(struct thread *td, int fd, struct file **fpp, 2184 struct mqfs_node **ppn, struct mqueue **pmq) 2185 { 2186 cap_rights_t rights; 2187 2188 return _getmq(td, fd, cap_rights_init(&rights, CAP_READ), fget_read, 2189 fpp, ppn, pmq); 2190 } 2191 2192 static __inline int 2193 getmq_write(struct thread *td, int fd, struct file **fpp, 2194 struct mqfs_node **ppn, struct mqueue **pmq) 2195 { 2196 cap_rights_t rights; 2197 2198 return _getmq(td, fd, cap_rights_init(&rights, CAP_WRITE), fget_write, 2199 fpp, ppn, pmq); 2200 } 2201 2202 static int 2203 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr, 2204 struct mq_attr *oattr) 2205 { 2206 struct mqueue *mq; 2207 struct file *fp; 2208 u_int oflag, flag; 2209 int error; 2210 2211 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0) 2212 return (EINVAL); 2213 error = getmq(td, mqd, &fp, NULL, &mq); 2214 if (error) 2215 return (error); 2216 oattr->mq_maxmsg = mq->mq_maxmsg; 2217 oattr->mq_msgsize = mq->mq_msgsize; 2218 oattr->mq_curmsgs = mq->mq_curmsgs; 2219 if (attr != NULL) { 2220 do { 2221 oflag = flag = fp->f_flag; 2222 flag &= ~O_NONBLOCK; 2223 flag |= (attr->mq_flags & O_NONBLOCK); 2224 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0); 2225 } else 2226 oflag = fp->f_flag; 2227 oattr->mq_flags = (O_NONBLOCK & oflag); 2228 fdrop(fp, td); 2229 return (error); 2230 } 2231 2232 int 2233 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap) 2234 { 2235 struct mq_attr attr, oattr; 2236 int error; 2237 2238 if (uap->attr != NULL) { 2239 error = copyin(uap->attr, &attr, sizeof(attr)); 2240 if (error != 0) 2241 return (error); 2242 } 2243 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2244 &oattr); 2245 if (error != 0) 2246 return (error); 2247 if (uap->oattr != NULL) 2248 error = copyout(&oattr, uap->oattr, sizeof(oattr)); 2249 return (error); 2250 } 2251 2252 int 2253 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap) 2254 { 2255 struct mqueue *mq; 2256 struct file *fp; 2257 struct timespec *abs_timeout, ets; 2258 int error; 2259 int waitok; 2260 2261 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2262 if (error) 2263 return (error); 2264 if (uap->abs_timeout != NULL) { 2265 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2266 if (error != 0) 2267 return (error); 2268 abs_timeout = &ets; 2269 } else 2270 abs_timeout = NULL; 2271 waitok = !(fp->f_flag & O_NONBLOCK); 2272 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2273 uap->msg_prio, waitok, abs_timeout); 2274 fdrop(fp, td); 2275 return (error); 2276 } 2277 2278 int 2279 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap) 2280 { 2281 struct mqueue *mq; 2282 struct file *fp; 2283 struct timespec *abs_timeout, ets; 2284 int error, waitok; 2285 2286 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2287 if (error) 2288 return (error); 2289 if (uap->abs_timeout != NULL) { 2290 error = copyin(uap->abs_timeout, &ets, sizeof(ets)); 2291 if (error != 0) 2292 return (error); 2293 abs_timeout = &ets; 2294 } else 2295 abs_timeout = NULL; 2296 waitok = !(fp->f_flag & O_NONBLOCK); 2297 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2298 uap->msg_prio, waitok, abs_timeout); 2299 fdrop(fp, td); 2300 return (error); 2301 } 2302 2303 static int 2304 kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev) 2305 { 2306 #ifdef CAPABILITIES 2307 cap_rights_t rights; 2308 #endif 2309 struct filedesc *fdp; 2310 struct proc *p; 2311 struct mqueue *mq; 2312 struct file *fp, *fp2; 2313 struct mqueue_notifier *nt, *newnt = NULL; 2314 int error; 2315 2316 if (sigev != NULL) { 2317 if (sigev->sigev_notify != SIGEV_SIGNAL && 2318 sigev->sigev_notify != SIGEV_THREAD_ID && 2319 sigev->sigev_notify != SIGEV_NONE) 2320 return (EINVAL); 2321 if ((sigev->sigev_notify == SIGEV_SIGNAL || 2322 sigev->sigev_notify == SIGEV_THREAD_ID) && 2323 !_SIG_VALID(sigev->sigev_signo)) 2324 return (EINVAL); 2325 } 2326 p = td->td_proc; 2327 fdp = td->td_proc->p_fd; 2328 error = getmq(td, mqd, &fp, NULL, &mq); 2329 if (error) 2330 return (error); 2331 again: 2332 FILEDESC_SLOCK(fdp); 2333 fp2 = fget_locked(fdp, mqd); 2334 if (fp2 == NULL) { 2335 FILEDESC_SUNLOCK(fdp); 2336 error = EBADF; 2337 goto out; 2338 } 2339 #ifdef CAPABILITIES 2340 error = cap_check(cap_rights(fdp, mqd), 2341 cap_rights_init(&rights, CAP_EVENT)); 2342 if (error) { 2343 FILEDESC_SUNLOCK(fdp); 2344 goto out; 2345 } 2346 #endif 2347 if (fp2 != fp) { 2348 FILEDESC_SUNLOCK(fdp); 2349 error = EBADF; 2350 goto out; 2351 } 2352 mtx_lock(&mq->mq_mutex); 2353 FILEDESC_SUNLOCK(fdp); 2354 if (sigev != NULL) { 2355 if (mq->mq_notifier != NULL) { 2356 error = EBUSY; 2357 } else { 2358 PROC_LOCK(p); 2359 nt = notifier_search(p, mqd); 2360 if (nt == NULL) { 2361 if (newnt == NULL) { 2362 PROC_UNLOCK(p); 2363 mtx_unlock(&mq->mq_mutex); 2364 newnt = notifier_alloc(); 2365 goto again; 2366 } 2367 } 2368 2369 if (nt != NULL) { 2370 sigqueue_take(&nt->nt_ksi); 2371 if (newnt != NULL) { 2372 notifier_free(newnt); 2373 newnt = NULL; 2374 } 2375 } else { 2376 nt = newnt; 2377 newnt = NULL; 2378 ksiginfo_init(&nt->nt_ksi); 2379 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT; 2380 nt->nt_ksi.ksi_code = SI_MESGQ; 2381 nt->nt_proc = p; 2382 nt->nt_ksi.ksi_mqd = mqd; 2383 notifier_insert(p, nt); 2384 } 2385 nt->nt_sigev = *sigev; 2386 mq->mq_notifier = nt; 2387 PROC_UNLOCK(p); 2388 /* 2389 * if there is no receivers and message queue 2390 * is not empty, we should send notification 2391 * as soon as possible. 2392 */ 2393 if (mq->mq_receivers == 0 && 2394 !TAILQ_EMPTY(&mq->mq_msgq)) 2395 mqueue_send_notification(mq); 2396 } 2397 } else { 2398 notifier_remove(p, mq, mqd); 2399 } 2400 mtx_unlock(&mq->mq_mutex); 2401 2402 out: 2403 fdrop(fp, td); 2404 if (newnt != NULL) 2405 notifier_free(newnt); 2406 return (error); 2407 } 2408 2409 int 2410 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap) 2411 { 2412 struct sigevent ev, *evp; 2413 int error; 2414 2415 if (uap->sigev == NULL) { 2416 evp = NULL; 2417 } else { 2418 error = copyin(uap->sigev, &ev, sizeof(ev)); 2419 if (error != 0) 2420 return (error); 2421 evp = &ev; 2422 } 2423 return (kern_kmq_notify(td, uap->mqd, evp)); 2424 } 2425 2426 static void 2427 mqueue_fdclose(struct thread *td, int fd, struct file *fp) 2428 { 2429 struct filedesc *fdp; 2430 struct mqueue *mq; 2431 2432 fdp = td->td_proc->p_fd; 2433 FILEDESC_LOCK_ASSERT(fdp); 2434 2435 if (fp->f_ops == &mqueueops) { 2436 mq = FPTOMQ(fp); 2437 mtx_lock(&mq->mq_mutex); 2438 notifier_remove(td->td_proc, mq, fd); 2439 2440 /* have to wakeup thread in same process */ 2441 if (mq->mq_flags & MQ_RSEL) { 2442 mq->mq_flags &= ~MQ_RSEL; 2443 selwakeup(&mq->mq_rsel); 2444 } 2445 if (mq->mq_flags & MQ_WSEL) { 2446 mq->mq_flags &= ~MQ_WSEL; 2447 selwakeup(&mq->mq_wsel); 2448 } 2449 mtx_unlock(&mq->mq_mutex); 2450 } 2451 } 2452 2453 static void 2454 mq_proc_exit(void *arg __unused, struct proc *p) 2455 { 2456 struct filedesc *fdp; 2457 struct file *fp; 2458 struct mqueue *mq; 2459 int i; 2460 2461 fdp = p->p_fd; 2462 FILEDESC_SLOCK(fdp); 2463 for (i = 0; i < fdp->fd_nfiles; ++i) { 2464 fp = fget_locked(fdp, i); 2465 if (fp != NULL && fp->f_ops == &mqueueops) { 2466 mq = FPTOMQ(fp); 2467 mtx_lock(&mq->mq_mutex); 2468 notifier_remove(p, FPTOMQ(fp), i); 2469 mtx_unlock(&mq->mq_mutex); 2470 } 2471 } 2472 FILEDESC_SUNLOCK(fdp); 2473 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left")); 2474 } 2475 2476 static int 2477 mqf_poll(struct file *fp, int events, struct ucred *active_cred, 2478 struct thread *td) 2479 { 2480 struct mqueue *mq = FPTOMQ(fp); 2481 int revents = 0; 2482 2483 mtx_lock(&mq->mq_mutex); 2484 if (events & (POLLIN | POLLRDNORM)) { 2485 if (mq->mq_curmsgs) { 2486 revents |= events & (POLLIN | POLLRDNORM); 2487 } else { 2488 mq->mq_flags |= MQ_RSEL; 2489 selrecord(td, &mq->mq_rsel); 2490 } 2491 } 2492 if (events & POLLOUT) { 2493 if (mq->mq_curmsgs < mq->mq_maxmsg) 2494 revents |= POLLOUT; 2495 else { 2496 mq->mq_flags |= MQ_WSEL; 2497 selrecord(td, &mq->mq_wsel); 2498 } 2499 } 2500 mtx_unlock(&mq->mq_mutex); 2501 return (revents); 2502 } 2503 2504 static int 2505 mqf_close(struct file *fp, struct thread *td) 2506 { 2507 struct mqfs_node *pn; 2508 2509 fp->f_ops = &badfileops; 2510 pn = fp->f_data; 2511 fp->f_data = NULL; 2512 sx_xlock(&mqfs_data.mi_lock); 2513 mqnode_release(pn); 2514 sx_xunlock(&mqfs_data.mi_lock); 2515 return (0); 2516 } 2517 2518 static int 2519 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 2520 struct thread *td) 2521 { 2522 struct mqfs_node *pn = fp->f_data; 2523 2524 bzero(st, sizeof *st); 2525 sx_xlock(&mqfs_data.mi_lock); 2526 st->st_atim = pn->mn_atime; 2527 st->st_mtim = pn->mn_mtime; 2528 st->st_ctim = pn->mn_ctime; 2529 st->st_birthtim = pn->mn_birth; 2530 st->st_uid = pn->mn_uid; 2531 st->st_gid = pn->mn_gid; 2532 st->st_mode = S_IFIFO | pn->mn_mode; 2533 sx_xunlock(&mqfs_data.mi_lock); 2534 return (0); 2535 } 2536 2537 static int 2538 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 2539 struct thread *td) 2540 { 2541 struct mqfs_node *pn; 2542 int error; 2543 2544 error = 0; 2545 pn = fp->f_data; 2546 sx_xlock(&mqfs_data.mi_lock); 2547 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN, 2548 active_cred, NULL); 2549 if (error != 0) 2550 goto out; 2551 pn->mn_mode = mode & ACCESSPERMS; 2552 out: 2553 sx_xunlock(&mqfs_data.mi_lock); 2554 return (error); 2555 } 2556 2557 static int 2558 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 2559 struct thread *td) 2560 { 2561 struct mqfs_node *pn; 2562 int error; 2563 2564 error = 0; 2565 pn = fp->f_data; 2566 sx_xlock(&mqfs_data.mi_lock); 2567 if (uid == (uid_t)-1) 2568 uid = pn->mn_uid; 2569 if (gid == (gid_t)-1) 2570 gid = pn->mn_gid; 2571 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) || 2572 (gid != pn->mn_gid && !groupmember(gid, active_cred))) && 2573 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0))) 2574 goto out; 2575 pn->mn_uid = uid; 2576 pn->mn_gid = gid; 2577 out: 2578 sx_xunlock(&mqfs_data.mi_lock); 2579 return (error); 2580 } 2581 2582 static int 2583 mqf_kqfilter(struct file *fp, struct knote *kn) 2584 { 2585 struct mqueue *mq = FPTOMQ(fp); 2586 int error = 0; 2587 2588 if (kn->kn_filter == EVFILT_READ) { 2589 kn->kn_fop = &mq_rfiltops; 2590 knlist_add(&mq->mq_rsel.si_note, kn, 0); 2591 } else if (kn->kn_filter == EVFILT_WRITE) { 2592 kn->kn_fop = &mq_wfiltops; 2593 knlist_add(&mq->mq_wsel.si_note, kn, 0); 2594 } else 2595 error = EINVAL; 2596 return (error); 2597 } 2598 2599 static void 2600 filt_mqdetach(struct knote *kn) 2601 { 2602 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2603 2604 if (kn->kn_filter == EVFILT_READ) 2605 knlist_remove(&mq->mq_rsel.si_note, kn, 0); 2606 else if (kn->kn_filter == EVFILT_WRITE) 2607 knlist_remove(&mq->mq_wsel.si_note, kn, 0); 2608 else 2609 panic("filt_mqdetach"); 2610 } 2611 2612 static int 2613 filt_mqread(struct knote *kn, long hint) 2614 { 2615 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2616 2617 mtx_assert(&mq->mq_mutex, MA_OWNED); 2618 return (mq->mq_curmsgs != 0); 2619 } 2620 2621 static int 2622 filt_mqwrite(struct knote *kn, long hint) 2623 { 2624 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2625 2626 mtx_assert(&mq->mq_mutex, MA_OWNED); 2627 return (mq->mq_curmsgs < mq->mq_maxmsg); 2628 } 2629 2630 static int 2631 mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 2632 { 2633 2634 kif->kf_type = KF_TYPE_MQUEUE; 2635 return (0); 2636 } 2637 2638 static struct fileops mqueueops = { 2639 .fo_read = invfo_rdwr, 2640 .fo_write = invfo_rdwr, 2641 .fo_truncate = invfo_truncate, 2642 .fo_ioctl = invfo_ioctl, 2643 .fo_poll = mqf_poll, 2644 .fo_kqfilter = mqf_kqfilter, 2645 .fo_stat = mqf_stat, 2646 .fo_close = mqf_close, 2647 .fo_chmod = mqf_chmod, 2648 .fo_chown = mqf_chown, 2649 .fo_sendfile = invfo_sendfile, 2650 .fo_fill_kinfo = mqf_fill_kinfo, 2651 }; 2652 2653 static struct vop_vector mqfs_vnodeops = { 2654 .vop_default = &default_vnodeops, 2655 .vop_access = mqfs_access, 2656 .vop_cachedlookup = mqfs_lookup, 2657 .vop_lookup = vfs_cache_lookup, 2658 .vop_reclaim = mqfs_reclaim, 2659 .vop_create = mqfs_create, 2660 .vop_remove = mqfs_remove, 2661 .vop_inactive = mqfs_inactive, 2662 .vop_open = mqfs_open, 2663 .vop_close = mqfs_close, 2664 .vop_getattr = mqfs_getattr, 2665 .vop_setattr = mqfs_setattr, 2666 .vop_read = mqfs_read, 2667 .vop_write = VOP_EOPNOTSUPP, 2668 .vop_readdir = mqfs_readdir, 2669 .vop_mkdir = VOP_EOPNOTSUPP, 2670 .vop_rmdir = VOP_EOPNOTSUPP 2671 }; 2672 2673 static struct vfsops mqfs_vfsops = { 2674 .vfs_init = mqfs_init, 2675 .vfs_uninit = mqfs_uninit, 2676 .vfs_mount = mqfs_mount, 2677 .vfs_unmount = mqfs_unmount, 2678 .vfs_root = mqfs_root, 2679 .vfs_statfs = mqfs_statfs, 2680 }; 2681 2682 static struct vfsconf mqueuefs_vfsconf = { 2683 .vfc_version = VFS_VERSION, 2684 .vfc_name = "mqueuefs", 2685 .vfc_vfsops = &mqfs_vfsops, 2686 .vfc_typenum = -1, 2687 .vfc_flags = VFCF_SYNTHETIC 2688 }; 2689 2690 static struct syscall_helper_data mq_syscalls[] = { 2691 SYSCALL_INIT_HELPER(kmq_open), 2692 SYSCALL_INIT_HELPER(kmq_setattr), 2693 SYSCALL_INIT_HELPER(kmq_timedsend), 2694 SYSCALL_INIT_HELPER(kmq_timedreceive), 2695 SYSCALL_INIT_HELPER(kmq_notify), 2696 SYSCALL_INIT_HELPER(kmq_unlink), 2697 SYSCALL_INIT_LAST 2698 }; 2699 2700 #ifdef COMPAT_FREEBSD32 2701 #include <compat/freebsd32/freebsd32.h> 2702 #include <compat/freebsd32/freebsd32_proto.h> 2703 #include <compat/freebsd32/freebsd32_signal.h> 2704 #include <compat/freebsd32/freebsd32_syscall.h> 2705 #include <compat/freebsd32/freebsd32_util.h> 2706 2707 static void 2708 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to) 2709 { 2710 2711 to->mq_flags = from->mq_flags; 2712 to->mq_maxmsg = from->mq_maxmsg; 2713 to->mq_msgsize = from->mq_msgsize; 2714 to->mq_curmsgs = from->mq_curmsgs; 2715 } 2716 2717 static void 2718 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to) 2719 { 2720 2721 to->mq_flags = from->mq_flags; 2722 to->mq_maxmsg = from->mq_maxmsg; 2723 to->mq_msgsize = from->mq_msgsize; 2724 to->mq_curmsgs = from->mq_curmsgs; 2725 } 2726 2727 int 2728 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap) 2729 { 2730 struct mq_attr attr; 2731 struct mq_attr32 attr32; 2732 int flags, error; 2733 2734 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC) 2735 return (EINVAL); 2736 flags = FFLAGS(uap->flags); 2737 if ((flags & O_CREAT) != 0 && uap->attr != NULL) { 2738 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2739 if (error) 2740 return (error); 2741 mq_attr_from32(&attr32, &attr); 2742 } 2743 return (kern_kmq_open(td, uap->path, flags, uap->mode, 2744 uap->attr != NULL ? &attr : NULL)); 2745 } 2746 2747 int 2748 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap) 2749 { 2750 struct mq_attr attr, oattr; 2751 struct mq_attr32 attr32, oattr32; 2752 int error; 2753 2754 if (uap->attr != NULL) { 2755 error = copyin(uap->attr, &attr32, sizeof(attr32)); 2756 if (error != 0) 2757 return (error); 2758 mq_attr_from32(&attr32, &attr); 2759 } 2760 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL, 2761 &oattr); 2762 if (error != 0) 2763 return (error); 2764 if (uap->oattr != NULL) { 2765 mq_attr_to32(&oattr, &oattr32); 2766 error = copyout(&oattr32, uap->oattr, sizeof(oattr32)); 2767 } 2768 return (error); 2769 } 2770 2771 int 2772 freebsd32_kmq_timedsend(struct thread *td, 2773 struct freebsd32_kmq_timedsend_args *uap) 2774 { 2775 struct mqueue *mq; 2776 struct file *fp; 2777 struct timespec32 ets32; 2778 struct timespec *abs_timeout, ets; 2779 int error; 2780 int waitok; 2781 2782 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2783 if (error) 2784 return (error); 2785 if (uap->abs_timeout != NULL) { 2786 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2787 if (error != 0) 2788 return (error); 2789 CP(ets32, ets, tv_sec); 2790 CP(ets32, ets, tv_nsec); 2791 abs_timeout = &ets; 2792 } else 2793 abs_timeout = NULL; 2794 waitok = !(fp->f_flag & O_NONBLOCK); 2795 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2796 uap->msg_prio, waitok, abs_timeout); 2797 fdrop(fp, td); 2798 return (error); 2799 } 2800 2801 int 2802 freebsd32_kmq_timedreceive(struct thread *td, 2803 struct freebsd32_kmq_timedreceive_args *uap) 2804 { 2805 struct mqueue *mq; 2806 struct file *fp; 2807 struct timespec32 ets32; 2808 struct timespec *abs_timeout, ets; 2809 int error, waitok; 2810 2811 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2812 if (error) 2813 return (error); 2814 if (uap->abs_timeout != NULL) { 2815 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32)); 2816 if (error != 0) 2817 return (error); 2818 CP(ets32, ets, tv_sec); 2819 CP(ets32, ets, tv_nsec); 2820 abs_timeout = &ets; 2821 } else 2822 abs_timeout = NULL; 2823 waitok = !(fp->f_flag & O_NONBLOCK); 2824 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2825 uap->msg_prio, waitok, abs_timeout); 2826 fdrop(fp, td); 2827 return (error); 2828 } 2829 2830 int 2831 freebsd32_kmq_notify(struct thread *td, struct freebsd32_kmq_notify_args *uap) 2832 { 2833 struct sigevent ev, *evp; 2834 struct sigevent32 ev32; 2835 int error; 2836 2837 if (uap->sigev == NULL) { 2838 evp = NULL; 2839 } else { 2840 error = copyin(uap->sigev, &ev32, sizeof(ev32)); 2841 if (error != 0) 2842 return (error); 2843 error = convert_sigevent32(&ev32, &ev); 2844 if (error != 0) 2845 return (error); 2846 evp = &ev; 2847 } 2848 return (kern_kmq_notify(td, uap->mqd, evp)); 2849 } 2850 2851 static struct syscall_helper_data mq32_syscalls[] = { 2852 SYSCALL32_INIT_HELPER(freebsd32_kmq_open), 2853 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr), 2854 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend), 2855 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive), 2856 SYSCALL32_INIT_HELPER(freebsd32_kmq_notify), 2857 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink), 2858 SYSCALL_INIT_LAST 2859 }; 2860 #endif 2861 2862 static int 2863 mqinit(void) 2864 { 2865 int error; 2866 2867 error = syscall_helper_register(mq_syscalls, SY_THR_STATIC_KLD); 2868 if (error != 0) 2869 return (error); 2870 #ifdef COMPAT_FREEBSD32 2871 error = syscall32_helper_register(mq32_syscalls, SY_THR_STATIC_KLD); 2872 if (error != 0) 2873 return (error); 2874 #endif 2875 return (0); 2876 } 2877 2878 static int 2879 mqunload(void) 2880 { 2881 2882 #ifdef COMPAT_FREEBSD32 2883 syscall32_helper_unregister(mq32_syscalls); 2884 #endif 2885 syscall_helper_unregister(mq_syscalls); 2886 return (0); 2887 } 2888 2889 static int 2890 mq_modload(struct module *module, int cmd, void *arg) 2891 { 2892 int error = 0; 2893 2894 error = vfs_modevent(module, cmd, arg); 2895 if (error != 0) 2896 return (error); 2897 2898 switch (cmd) { 2899 case MOD_LOAD: 2900 error = mqinit(); 2901 if (error != 0) 2902 mqunload(); 2903 break; 2904 case MOD_UNLOAD: 2905 error = mqunload(); 2906 break; 2907 default: 2908 break; 2909 } 2910 return (error); 2911 } 2912 2913 static moduledata_t mqueuefs_mod = { 2914 "mqueuefs", 2915 mq_modload, 2916 &mqueuefs_vfsconf 2917 }; 2918 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE); 2919 MODULE_VERSION(mqueuefs, 1); 2920