uipc_mqueue.c revision 153155
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: head/sys/kern/uipc_mqueue.c 153155 2005-12-06 06:22:12Z davidxu $"); 47 48#include <sys/param.h> 49#include <sys/kernel.h> 50#include <sys/systm.h> 51#include <sys/limits.h> 52#include <sys/buf.h> 53#include <sys/dirent.h> 54#include <sys/event.h> 55#include <sys/eventhandler.h> 56#include <sys/fcntl.h> 57#include <sys/file.h> 58#include <sys/filedesc.h> 59#include <sys/limits.h> 60#include <sys/lock.h> 61#include <sys/malloc.h> 62#include <sys/module.h> 63#include <sys/mount.h> 64#include <sys/mqueue.h> 65#include <sys/mutex.h> 66#include <sys/namei.h> 67#include <sys/poll.h> 68#include <sys/proc.h> 69#include <sys/queue.h> 70#include <sys/sysproto.h> 71#include <sys/stat.h> 72#include <sys/syscall.h> 73#include <sys/syscallsubr.h> 74#include <sys/sysent.h> 75#include <sys/sx.h> 76#include <sys/sysctl.h> 77#include <sys/taskqueue.h> 78#include <sys/unistd.h> 79#include <sys/vnode.h> 80#include <machine/atomic.h> 81#include <posix4/posix4.h> 82 83/* 84 * Limits and constants 85 */ 86#define MQFS_NAMELEN NAME_MAX 87#define MQFS_DELEN (8 + MQFS_NAMELEN) 88 89/* node types */ 90typedef enum { 91 mqfstype_none = 0, 92 mqfstype_root, 93 mqfstype_dir, 94 mqfstype_this, 95 mqfstype_parent, 96 mqfstype_file, 97 mqfstype_symlink, 98} mqfs_type_t; 99 100struct mqfs_node; 101 102/* 103 * mqfs_info: describes a mqfs instance 104 */ 105struct mqfs_info { 106 struct sx mi_lock; 107 struct mqfs_node *mi_root; 108 struct unrhdr *mi_unrhdr; 109}; 110 111struct mqfs_vdata { 112 LIST_ENTRY(mqfs_vdata) mv_link; 113 struct mqfs_node *mv_node; 114 struct vnode *mv_vnode; 115 struct task mv_task; 116}; 117 118/* 119 * mqfs_node: describes a node (file or directory) within a mqfs 120 */ 121struct mqfs_node { 122 char mn_name[MQFS_NAMELEN+1]; 123 struct mqfs_info *mn_info; 124 struct mqfs_node *mn_parent; 125 LIST_HEAD(,mqfs_node) mn_children; 126 LIST_ENTRY(mqfs_node) mn_sibling; 127 LIST_HEAD(,mqfs_vdata) mn_vnodes; 128 int mn_refcount; 129 mqfs_type_t mn_type; 130 int mn_deleted; 131 u_int32_t mn_fileno; 132 void *mn_data; 133 struct timespec mn_birth; 134 struct timespec mn_ctime; 135 struct timespec mn_atime; 136 struct timespec mn_mtime; 137 uid_t mn_uid; 138 gid_t mn_gid; 139 int mn_mode; 140}; 141 142#define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node) 143#define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data)) 144#define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data)) 145#define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \ 146 (fp)->f_data)->mn_data)) 147 148TAILQ_HEAD(msgq, mqueue_msg); 149 150struct mqueue; 151 152struct mqueue_notifier { 153 LIST_ENTRY(mqueue_notifier) nt_link; 154 struct sigevent nt_sigev; 155 ksiginfo_t nt_ksi; 156 struct proc *nt_proc; 157}; 158 159struct mqueue { 160 struct mtx mq_mutex; 161 int mq_flags; 162 long mq_maxmsg; 163 long mq_msgsize; 164 long mq_curmsgs; 165 long mq_totalbytes; 166 struct msgq mq_msgq; 167 int mq_receivers; 168 int mq_senders; 169 struct selinfo mq_rsel; 170 struct selinfo mq_wsel; 171 struct mqueue_notifier *mq_notifier; 172}; 173 174#define MQ_RSEL 0x01 175#define MQ_WSEL 0x02 176 177struct mqueue_msg { 178 TAILQ_ENTRY(mqueue_msg) msg_link; 179 unsigned int msg_prio; 180 unsigned int msg_size; 181 /* following real data... */ 182}; 183 184SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0, 185 "POSIX real time message queue"); 186 187static int default_maxmsg = 10; 188static int default_msgsize = 1024; 189 190static int maxmsg = 100; 191SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW, 192 &maxmsg, 0, "Default maximum messages in queue"); 193static int maxmsgsize = 16384; 194SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW, 195 &maxmsgsize, 0, "Default maximum message size"); 196static int maxmq = 100; 197SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW, 198 &maxmq, 0, "maximum message queues"); 199static int curmq = 0; 200SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW, 201 &curmq, 0, "current message queue number"); 202static int unloadable = 0; 203static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data"); 204 205static eventhandler_tag exit_tag; 206 207/* Only one instance per-system */ 208static struct mqfs_info mqfs_data; 209static uma_zone_t mqnode_zone; 210static uma_zone_t mqueue_zone; 211static uma_zone_t mvdata_zone; 212static uma_zone_t mqnoti_zone; 213static struct vop_vector mqfs_vnodeops; 214static struct fileops mqueueops; 215 216/* 217 * Directory structure construction and manipulation 218 */ 219#ifdef notyet 220static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent, 221 const char *name, int namelen); 222#endif 223 224static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent, 225 const char *name, int namelen); 226struct mqfs_node *mqfs_create_link(struct mqfs_node *parent, 227 const char *name, int namelen); 228static int mqfs_destroy(struct mqfs_node *mn); 229static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn); 230static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn); 231static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn); 232 233/* 234 * Message queue construction and maniplation 235 */ 236static struct mqueue *mqueue_alloc(const struct mq_attr *attr); 237static void mqueue_free(struct mqueue *mq); 238static int mqueue_send(struct mqueue *mq, const char *msg_ptr, 239 size_t msg_len, unsigned msg_prio, int waitok, 240 const struct timespec *abs_timeout); 241static int mqueue_receive(struct mqueue *mq, char *msg_ptr, 242 size_t msg_len, unsigned *msg_prio, int waitok, 243 const struct timespec *abs_timeout); 244static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, 245 int timo); 246static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, 247 int timo); 248static void mqueue_send_notification(struct mqueue *mq); 249static void mqueue_fdclose(struct thread *td, int fd, struct file *fp); 250static void mq_proc_exit(void *arg, struct proc *p); 251 252/* 253 * kqueue filters 254 */ 255static void filt_mqdetach(struct knote *kn); 256static int filt_mqread(struct knote *kn, long hint); 257static int filt_mqwrite(struct knote *kn, long hint); 258 259struct filterops mq_rfiltops = 260 { 1, NULL, filt_mqdetach, filt_mqread }; 261struct filterops mq_wfiltops = 262 { 1, NULL, filt_mqdetach, filt_mqwrite }; 263 264/* 265 * Initialize fileno bitmap 266 */ 267static void 268mqfs_fileno_init(struct mqfs_info *mi) 269{ 270 struct unrhdr *up; 271 272 up = new_unrhdr(1, INT_MAX, NULL); 273 mi->mi_unrhdr = up; 274} 275 276/* 277 * Tear down fileno bitmap 278 */ 279static void 280mqfs_fileno_uninit(struct mqfs_info *mi) 281{ 282 struct unrhdr *up; 283 284 up = mi->mi_unrhdr; 285 mi->mi_unrhdr = NULL; 286 delete_unrhdr(up); 287} 288 289/* 290 * Allocate a file number 291 */ 292static void 293mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn) 294{ 295 /* make sure our parent has a file number */ 296 if (mn->mn_parent && !mn->mn_parent->mn_fileno) 297 mqfs_fileno_alloc(mi, mn->mn_parent); 298 299 switch (mn->mn_type) { 300 case mqfstype_root: 301 case mqfstype_dir: 302 case mqfstype_file: 303 case mqfstype_symlink: 304 mn->mn_fileno = alloc_unr(mi->mi_unrhdr); 305 break; 306 case mqfstype_this: 307 KASSERT(mn->mn_parent != NULL, 308 ("mqfstype_this node has no parent")); 309 mn->mn_fileno = mn->mn_parent->mn_fileno; 310 break; 311 case mqfstype_parent: 312 KASSERT(mn->mn_parent != NULL, 313 ("mqfstype_parent node has no parent")); 314 if (mn->mn_parent == mi->mi_root) { 315 mn->mn_fileno = mn->mn_parent->mn_fileno; 316 break; 317 } 318 KASSERT(mn->mn_parent->mn_parent != NULL, 319 ("mqfstype_parent node has no grandparent")); 320 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno; 321 break; 322 default: 323 KASSERT(0, 324 ("mqfs_fileno_alloc() called for unknown type node: %d", 325 mn->mn_type)); 326 break; 327 } 328} 329 330/* 331 * Release a file number 332 */ 333static void 334mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn) 335{ 336 switch (mn->mn_type) { 337 case mqfstype_root: 338 case mqfstype_dir: 339 case mqfstype_file: 340 case mqfstype_symlink: 341 free_unr(mi->mi_unrhdr, mn->mn_fileno); 342 break; 343 case mqfstype_this: 344 case mqfstype_parent: 345 /* ignore these, as they don't "own" their file number */ 346 break; 347 default: 348 KASSERT(0, 349 ("mqfs_fileno_free() called for unknown type node: %d", 350 mn->mn_type)); 351 break; 352 } 353} 354 355static __inline struct mqfs_node * 356mqnode_alloc(void) 357{ 358 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO); 359} 360 361static __inline void 362mqnode_free(struct mqfs_node *node) 363{ 364 uma_zfree(mqnode_zone, node); 365} 366 367static __inline void 368mqnode_addref(struct mqfs_node *node) 369{ 370 atomic_fetchadd_int(&node->mn_refcount, 1); 371} 372 373static __inline void 374mqnode_release(struct mqfs_node *node) 375{ 376 int old, exp; 377 378 old = atomic_fetchadd_int(&node->mn_refcount, -1); 379 if (node->mn_type == mqfstype_dir || 380 node->mn_type == mqfstype_root) 381 exp = 3; /* include . and .. */ 382 else 383 exp = 1; 384 if (old == exp) 385 mqfs_destroy(node); 386} 387 388/* 389 * Add a node to a directory 390 */ 391static int 392mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node) 393{ 394 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__)); 395 KASSERT(parent->mn_info != NULL, 396 ("%s(): parent has no mn_info", __func__)); 397 KASSERT(parent->mn_type == mqfstype_dir || 398 parent->mn_type == mqfstype_root, 399 ("%s(): parent is not a directory", __func__)); 400 401 node->mn_info = parent->mn_info; 402 node->mn_parent = parent; 403 LIST_INIT(&node->mn_children); 404 LIST_INIT(&node->mn_vnodes); 405 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling); 406 mqnode_addref(parent); 407 return (0); 408} 409 410/* 411 * Add . and .. to a directory 412 */ 413static int 414mqfs_fixup_dir(struct mqfs_node *parent) 415{ 416 struct mqfs_node *dir; 417 418 dir = mqnode_alloc(); 419 dir->mn_name[0] = '.'; 420 dir->mn_type = mqfstype_this; 421 dir->mn_refcount = 1; 422 if (mqfs_add_node(parent, dir) != 0) { 423 mqnode_free(dir); 424 return (-1); 425 } 426 427 dir = mqnode_alloc(); 428 dir->mn_name[0] = dir->mn_name[1] = '.'; 429 dir->mn_type = mqfstype_parent; 430 dir->mn_refcount = 1; 431 432 if (mqfs_add_node(parent, dir) != 0) { 433 mqnode_free(dir); 434 return (-1); 435 } 436 437 return (0); 438} 439 440#ifdef notyet 441 442/* 443 * Create a directory 444 */ 445static struct mqfs_node * 446mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen) 447{ 448 struct mqfs_node *dir; 449 450 dir = mqnode_alloc(); 451 strncpy(dir->mn_name, name, namelen); 452 dir->mn_type = mqfstype_dir; 453 dir->mn_refcount = 1; 454 if (mqfs_add_node(parent, dir) != 0) { 455 mqnode_free(dir); 456 return (NULL); 457 } 458 459 if (mqfs_fixup_dir(dir) != 0) { 460 mqfs_destroy(dir); 461 return (NULL); 462 } 463 464 return (dir); 465} 466 467/* 468 * Create a symlink 469 */ 470static struct mqfs_node * 471mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen) 472{ 473 struct mqfs_node *node; 474 475 node = mqfs_create_file(parent, name, namelen); 476 if (node == NULL) 477 return (NULL); 478 node->mn_type = mqfstype_symlink; 479 return (node); 480} 481 482#endif 483 484/* 485 * Create a file 486 */ 487static struct mqfs_node * 488mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen) 489{ 490 struct mqfs_node *node; 491 492 node = mqnode_alloc(); 493 strncpy(node->mn_name, name, namelen); 494 node->mn_type = mqfstype_file; 495 node->mn_refcount = 1; 496 497 if (mqfs_add_node(parent, node) != 0) { 498 mqnode_free(node); 499 return (NULL); 500 } 501 return (node); 502} 503 504/* 505 * Destroy a node or a tree of nodes 506 */ 507static int 508mqfs_destroy(struct mqfs_node *node) 509{ 510 struct mqfs_node *parent; 511 512 KASSERT(node != NULL, 513 ("%s(): node is NULL", __func__)); 514 KASSERT(node->mn_info != NULL, 515 ("%s(): node has no mn_info", __func__)); 516 517 /* destroy children */ 518 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root) 519 while (! LIST_EMPTY(&node->mn_children)) 520 mqfs_destroy(LIST_FIRST(&node->mn_children)); 521 522 /* unlink from parent */ 523 if ((parent = node->mn_parent) != NULL) { 524 KASSERT(parent->mn_info == node->mn_info, 525 ("%s(): parent has different mn_info", __func__)); 526 LIST_REMOVE(node, mn_sibling); 527 } 528 529 if (node->mn_fileno != 0) 530 mqfs_fileno_free(node->mn_info, node); 531 if (node->mn_data != NULL) 532 mqueue_free(node->mn_data); 533 mqnode_free(node); 534 return (0); 535} 536 537/* 538 * Mount a mqfs instance 539 */ 540static int 541mqfs_mount(struct mount *mp, struct thread *td) 542{ 543 struct statfs *sbp; 544 545 if (mp->mnt_flag & MNT_UPDATE) 546 return (EOPNOTSUPP); 547 548 mp->mnt_data = &mqfs_data; 549 mp->mnt_flag |= MNT_LOCAL; 550 mp->mnt_kern_flag |= MNTK_MPSAFE; 551 vfs_getnewfsid(mp); 552 553 sbp = &mp->mnt_stat; 554 vfs_mountedfrom(mp, "mqueue"); 555 sbp->f_bsize = PAGE_SIZE; 556 sbp->f_iosize = PAGE_SIZE; 557 sbp->f_blocks = 1; 558 sbp->f_bfree = 0; 559 sbp->f_bavail = 0; 560 sbp->f_files = 1; 561 sbp->f_ffree = 0; 562 return (0); 563} 564 565/* 566 * Unmount a mqfs instance 567 */ 568static int 569mqfs_unmount(struct mount *mp, int mntflags, struct thread *td) 570{ 571 int error; 572 573 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0, td); 574 return (error); 575} 576 577/* 578 * Return a root vnode 579 */ 580static int 581mqfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td) 582{ 583 struct mqfs_info *mqfs; 584 int ret; 585 586 mqfs = VFSTOMQFS(mp); 587 sx_xlock(&mqfs->mi_lock); 588 ret = mqfs_allocv(mp, vpp, mqfs->mi_root); 589 sx_xunlock(&mqfs->mi_lock); 590 return (ret); 591} 592 593/* 594 * Return filesystem stats 595 */ 596static int 597mqfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 598{ 599 /* XXX update statistics */ 600 return (0); 601} 602 603/* 604 * Initialize a mqfs instance 605 */ 606static int 607mqfs_init(struct vfsconf *vfc) 608{ 609 struct mqfs_node *root; 610 struct mqfs_info *mi; 611 612 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node), 613 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 614 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue), 615 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 616 mvdata_zone = uma_zcreate("mvdata", 617 sizeof(struct mqfs_vdata), NULL, NULL, NULL, 618 NULL, UMA_ALIGN_PTR, 0); 619 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier), 620 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 621 mi = &mqfs_data; 622 sx_init(&mi->mi_lock, "mqfs lock"); 623 /* set up the root diretory */ 624 root = mqnode_alloc(); 625 root->mn_type = mqfstype_root; 626 root->mn_refcount = 1; 627 root->mn_name[0] = '/'; 628 root->mn_info = mi; 629 LIST_INIT(&root->mn_children); 630 LIST_INIT(&root->mn_vnodes); 631 root->mn_mode = 01777; 632 mi->mi_root = root; 633 mqfs_fileno_init(mi); 634 mqfs_fileno_alloc(mi, root); 635 mqfs_fixup_dir(root); 636 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL, 637 EVENTHANDLER_PRI_ANY); 638 mq_fdclose = mqueue_fdclose; 639 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING); 640 return (0); 641} 642 643/* 644 * Destroy a mqfs instance 645 */ 646static int 647mqfs_uninit(struct vfsconf *vfc) 648{ 649 struct mqfs_info *mi; 650 651 if (!unloadable) 652 return (EOPNOTSUPP); 653 EVENTHANDLER_DEREGISTER(process_exit, exit_tag); 654 mi = &mqfs_data; 655 mqfs_destroy(mi->mi_root); 656 mi->mi_root = NULL; 657 mqfs_fileno_uninit(mi); 658 sx_destroy(&mi->mi_lock); 659 uma_zdestroy(mqnode_zone); 660 uma_zdestroy(mqueue_zone); 661 uma_zdestroy(mvdata_zone); 662 uma_zdestroy(mqnoti_zone); 663 return (0); 664} 665 666/* 667 * task routine 668 */ 669static void 670do_recycle(void *context, int pending __unused) 671{ 672 struct vnode *vp = (struct vnode *)context; 673 674 vrecycle(vp, curthread); 675 vdrop(vp); 676} 677 678/* 679 * Allocate a vnode 680 */ 681static int 682mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn) 683{ 684 struct mqfs_vdata *vd; 685 int error; 686 687 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 688 if (vd->mv_vnode->v_mount == mp) 689 break; 690 } 691 692 if (vd != NULL) { 693 if (vget(vd->mv_vnode, 0, curthread) == 0) { 694 *vpp = vd->mv_vnode; 695 vn_lock(*vpp, LK_RETRY | LK_EXCLUSIVE, 696 curthread); 697 return (0); 698 } 699 /* XXX if this can happen, we're in trouble */ 700 } 701 702 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, vpp); 703 if (error) 704 return (error); 705 vd = uma_zalloc(mvdata_zone, M_WAITOK); 706 (*vpp)->v_data = vd; 707 vd->mv_vnode = *vpp; 708 vd->mv_node = pn; 709 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp); 710 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link); 711 mqnode_addref(pn); 712 switch (pn->mn_type) { 713 case mqfstype_root: 714 (*vpp)->v_vflag = VV_ROOT; 715 /* fall through */ 716 case mqfstype_dir: 717 case mqfstype_this: 718 case mqfstype_parent: 719 (*vpp)->v_type = VDIR; 720 break; 721 case mqfstype_file: 722 (*vpp)->v_type = VREG; 723 break; 724 case mqfstype_symlink: 725 (*vpp)->v_type = VLNK; 726 break; 727 case mqfstype_none: 728 KASSERT(0, ("mqfs_allocf called for null node\n")); 729 default: 730 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type); 731 } 732 vn_lock(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread); 733 return (0); 734} 735 736/* 737 * Search a directory entry 738 */ 739static struct mqfs_node * 740mqfs_search(struct mqfs_node *pd, const char *name, int len) 741{ 742 struct mqfs_node *pn; 743 744 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 745 if (strncmp(pn->mn_name, name, len) == 0) 746 return (pn); 747 } 748 return (NULL); 749} 750 751/* 752 * Look up a file or directory 753 */ 754static int 755mqfs_lookupx(struct vop_cachedlookup_args *ap) 756{ 757 struct componentname *cnp; 758 struct vnode *dvp, **vpp; 759 struct mqfs_node *pd; 760 struct mqfs_node *pn; 761 int nameiop, flags, error, namelen; 762 char *pname; 763 struct thread *td; 764 765 cnp = ap->a_cnp; 766 vpp = ap->a_vpp; 767 dvp = ap->a_dvp; 768 pname = cnp->cn_nameptr; 769 namelen = cnp->cn_namelen; 770 td = cnp->cn_thread; 771 flags = cnp->cn_flags; 772 nameiop = cnp->cn_nameiop; 773 pd = VTON(dvp); 774 pn = NULL; 775 *vpp = NULLVP; 776 777 if (dvp->v_type != VDIR) 778 return (ENOTDIR); 779 780 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 781 if (error) 782 return (error); 783 784 /* shortcut: check if the name is too long */ 785 if (cnp->cn_namelen >= MQFS_NAMELEN) 786 return (ENOENT); 787 788 /* self */ 789 if (namelen == 1 && pname[0] == '.') { 790 if ((flags & ISLASTCN) && nameiop != LOOKUP) 791 return (EINVAL); 792 pn = pd; 793 *vpp = dvp; 794 VREF(dvp); 795 return (0); 796 } 797 798 /* parent */ 799 if (cnp->cn_flags & ISDOTDOT) { 800 if (dvp->v_vflag & VV_ROOT) 801 return (EIO); 802 if ((flags & ISLASTCN) && nameiop != LOOKUP) 803 return (EINVAL); 804 VOP_UNLOCK(dvp, 0, cnp->cn_thread); 805 KASSERT(pd->mn_parent, ("non-root directory has no parent")); 806 pn = pd->mn_parent; 807 error = mqfs_allocv(dvp->v_mount, vpp, pn); 808 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 809 return (error); 810 } 811 812 /* named node */ 813 pn = mqfs_search(pd, pname, namelen); 814 815 /* found */ 816 if (pn != NULL) { 817 /* DELETE */ 818 if (nameiop == DELETE && (flags & ISLASTCN)) { 819 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 820 if (error) 821 return (error); 822 if (*vpp == dvp) { 823 VREF(dvp); 824 *vpp = dvp; 825 return (0); 826 } 827 } 828 829 /* allocate vnode */ 830 error = mqfs_allocv(dvp->v_mount, vpp, pn); 831 if (error == 0 && cnp->cn_flags & MAKEENTRY) 832 cache_enter(dvp, *vpp, cnp); 833 return (error); 834 } 835 836 /* not found */ 837 838 /* will create a new entry in the directory ? */ 839 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT) 840 && (flags & ISLASTCN)) { 841 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 842 if (error) 843 return (error); 844 cnp->cn_flags |= SAVENAME; 845 return (EJUSTRETURN); 846 } 847 return (ENOENT); 848} 849 850#if 0 851struct vop_lookup_args { 852 struct vop_generic_args a_gen; 853 struct vnode *a_dvp; 854 struct vnode **a_vpp; 855 struct componentname *a_cnp; 856}; 857#endif 858 859/* 860 * vnode lookup operation 861 */ 862static int 863mqfs_lookup(struct vop_cachedlookup_args *ap) 864{ 865 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 866 int rc; 867 868 sx_xlock(&mqfs->mi_lock); 869 rc = mqfs_lookupx(ap); 870 sx_xunlock(&mqfs->mi_lock); 871 return (rc); 872} 873 874#if 0 875struct vop_create_args { 876 struct vnode *a_dvp; 877 struct vnode **a_vpp; 878 struct componentname *a_cnp; 879 struct vattr *a_vap; 880}; 881#endif 882 883/* 884 * vnode creation operation 885 */ 886static int 887mqfs_create(struct vop_create_args *ap) 888{ 889 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 890 struct componentname *cnp = ap->a_cnp; 891 struct mqfs_node *pd; 892 struct mqfs_node *pn; 893 struct mqueue *mq; 894 int error; 895 896 pd = VTON(ap->a_dvp); 897 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 898 return (ENOTDIR); 899 mq = mqueue_alloc(NULL); 900 if (mq == NULL) 901 return (EAGAIN); 902 sx_xlock(&mqfs->mi_lock); 903#if 0 904 /* named node */ 905 pn = mqfs_search(pd, cnp->cn_nameptr, cnp->cn_namelen); 906 if (pn != NULL) { 907 mqueue_free(mq); 908 sx_xunlock(&mqfs->mi_lock); 909 return (EEXIST); 910 } 911#else 912 if ((cnp->cn_flags & HASBUF) == 0) 913 panic("%s: no name", __func__); 914#endif 915 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen); 916 pn->mn_mode = ap->a_vap->va_mode; 917 pn->mn_uid = cnp->cn_cred->cr_uid; 918 pn->mn_gid = cnp->cn_cred->cr_gid; 919 pn->mn_data = mq; 920 getnanotime(&pn->mn_birth); 921 pn->mn_ctime = pn->mn_atime = pn->mn_mtime = pn->mn_birth; 922 /* node attribute */ 923 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 924 sx_xunlock(&mqfs->mi_lock); 925 return (error); 926} 927 928/* 929 * Remove an entry 930 */ 931static 932int do_unlink(struct mqfs_node *pn, struct ucred *ucred) 933{ 934 struct mqfs_node *parent; 935 struct mqfs_vdata *vd; 936 int error = 0; 937 938 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED); 939 940 if (ucred->cr_uid != pn->mn_uid && 941 (error = suser_cred(ucred, 0)) != 0) 942 error = EACCES; 943 else if (!pn->mn_deleted) { 944 parent = pn->mn_parent; 945 pn->mn_parent = NULL; 946 pn->mn_deleted = 1; 947 LIST_REMOVE(pn, mn_sibling); 948 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) { 949 cache_purge(vd->mv_vnode); 950 vhold(vd->mv_vnode); 951 taskqueue_enqueue(taskqueue_thread, &vd->mv_task); 952 } 953 mqnode_release(pn); 954 mqnode_release(parent); 955 } else 956 error = ENOENT; 957 return (error); 958} 959 960#if 0 961struct vop_remove_args { 962 struct vnode *a_dvp; 963 struct vnode *a_vp; 964 struct componentname *a_cnp; 965}; 966#endif 967 968/* 969 * vnode removal operation 970 */ 971static int 972mqfs_remove(struct vop_remove_args *ap) 973{ 974 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 975 struct mqfs_node *pn; 976 int error; 977 978 if (ap->a_vp->v_type == VDIR) 979 return (EPERM); 980 pn = VTON(ap->a_vp); 981 sx_xlock(&mqfs->mi_lock); 982 error = do_unlink(pn, ap->a_cnp->cn_cred); 983 sx_xunlock(&mqfs->mi_lock); 984 return (error); 985} 986 987#if 0 988struct vop_inactive_args { 989 struct vnode *a_vp; 990 struct thread *a_td; 991}; 992#endif 993 994static int 995mqfs_inactive(struct vop_inactive_args *ap) 996{ 997 struct mqfs_node *pn = VTON(ap->a_vp); 998 999 if (pn->mn_deleted) 1000 vrecycle(ap->a_vp, ap->a_td); 1001 return (0); 1002} 1003 1004#if 0 1005struct vop_reclaim_args { 1006 struct vop_generic_args a_gen; 1007 struct vnode *a_vp; 1008 struct thread *a_td; 1009}; 1010#endif 1011 1012static int 1013mqfs_reclaim(struct vop_reclaim_args *ap) 1014{ 1015 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount); 1016 struct vnode *vp = ap->a_vp; 1017 struct mqfs_node *pn; 1018 struct mqfs_vdata *vd; 1019 1020 vd = vp->v_data; 1021 pn = vd->mv_node; 1022 sx_xlock(&mqfs->mi_lock); 1023 vp->v_data = NULL; 1024 LIST_REMOVE(vd, mv_link); 1025 uma_zfree(mvdata_zone, vd); 1026 mqnode_release(pn); 1027 sx_xunlock(&mqfs->mi_lock); 1028 return (0); 1029} 1030 1031#if 0 1032struct vop_open_args { 1033 struct vop_generic_args a_gen; 1034 struct vnode *a_vp; 1035 int a_mode; 1036 struct ucred *a_cred; 1037 struct thread *a_td; 1038 int a_fdidx; 1039}; 1040#endif 1041 1042static int 1043mqfs_open(struct vop_open_args *ap) 1044{ 1045 return (0); 1046} 1047 1048#if 0 1049struct vop_close_args { 1050 struct vop_generic_args a_gen; 1051 struct vnode *a_vp; 1052 int a_fflag; 1053 struct ucred *a_cred; 1054 struct thread *a_td; 1055}; 1056#endif 1057 1058static int 1059mqfs_close(struct vop_close_args *ap) 1060{ 1061 return (0); 1062} 1063 1064#if 0 1065struct vop_access_args { 1066 struct vop_generic_args a_gen; 1067 struct vnode *a_vp; 1068 int a_mode; 1069 struct ucred *a_cred; 1070 struct thread *a_td; 1071}; 1072#endif 1073 1074/* 1075 * Verify permissions 1076 */ 1077static int 1078mqfs_access(struct vop_access_args *ap) 1079{ 1080 struct vnode *vp = ap->a_vp; 1081 struct vattr vattr; 1082 int error; 1083 1084 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 1085 if (error) 1086 return (error); 1087 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid, 1088 vattr.va_gid, ap->a_mode, ap->a_cred, NULL); 1089 return (error); 1090} 1091 1092#if 0 1093struct vop_getattr_args { 1094 struct vop_generic_args a_gen; 1095 struct vnode *a_vp; 1096 struct vattr *a_vap; 1097 struct ucred *a_cred; 1098 struct thread *a_td; 1099}; 1100#endif 1101 1102/* 1103 * Get file attributes 1104 */ 1105static int 1106mqfs_getattr(struct vop_getattr_args *ap) 1107{ 1108 struct vnode *vp = ap->a_vp; 1109 struct mqfs_node *pn = VTON(vp); 1110 struct vattr *vap = ap->a_vap; 1111 int error = 0; 1112 1113 VATTR_NULL(vap); 1114 vap->va_type = vp->v_type; 1115 vap->va_mode = pn->mn_mode; 1116 vap->va_nlink = 1; 1117 vap->va_uid = pn->mn_uid; 1118 vap->va_gid = pn->mn_gid; 1119 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 1120 vap->va_fileid = pn->mn_fileno; 1121 vap->va_size = 0; 1122 vap->va_blocksize = PAGE_SIZE; 1123 vap->va_bytes = vap->va_size = 0; 1124 vap->va_atime = pn->mn_atime; 1125 vap->va_mtime = pn->mn_mtime; 1126 vap->va_ctime = pn->mn_ctime; 1127 vap->va_birthtime = pn->mn_birth; 1128 vap->va_gen = 0; 1129 vap->va_flags = 0; 1130 vap->va_rdev = 0; 1131 vap->va_bytes = 0; 1132 vap->va_filerev = 0; 1133 vap->va_vaflags = 0; 1134 return (error); 1135} 1136 1137#if 0 1138struct vop_setattr_args { 1139 struct vop_generic_args a_gen; 1140 struct vnode *a_vp; 1141 struct vattr *a_vap; 1142 struct ucred *a_cred; 1143 struct thread *a_td; 1144}; 1145#endif 1146/* 1147 * Set attributes 1148 */ 1149static int 1150mqfs_setattr(struct vop_setattr_args *ap) 1151{ 1152 struct mqfs_node *pn; 1153 struct vattr *vap; 1154 struct vnode *vp; 1155 int c, error; 1156 uid_t uid; 1157 gid_t gid; 1158 1159 vap = ap->a_vap; 1160 vp = ap->a_vp; 1161 if ((vap->va_type != VNON) || 1162 (vap->va_nlink != VNOVAL) || 1163 (vap->va_fsid != VNOVAL) || 1164 (vap->va_fileid != VNOVAL) || 1165 (vap->va_blocksize != VNOVAL) || 1166 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1167 (vap->va_rdev != VNOVAL) || 1168 ((int)vap->va_bytes != VNOVAL) || 1169 (vap->va_gen != VNOVAL)) { 1170 return (EINVAL); 1171 } 1172 1173 pn = VTON(vp); 1174 1175 error = c = 0; 1176 if (vap->va_uid == (uid_t)VNOVAL) 1177 uid = pn->mn_uid; 1178 else 1179 uid = vap->va_uid; 1180 if (vap->va_gid == (gid_t)VNOVAL) 1181 gid = pn->mn_gid; 1182 else 1183 gid = vap->va_gid; 1184 1185 if (uid != pn->mn_uid || gid != pn->mn_gid) { 1186 /* 1187 * To modify the ownership of a file, must possess VADMIN 1188 * for that file. 1189 */ 1190 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td))) 1191 return (error); 1192 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid || 1193 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) && 1194 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)) 1195 != 0) 1196 return (error); 1197 pn->mn_uid = uid; 1198 pn->mn_gid = gid; 1199 c = 1; 1200 } 1201 1202 if (vap->va_mode != (mode_t)VNOVAL) { 1203 if ((ap->a_cred->cr_uid != pn->mn_uid) && 1204 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL))) 1205 return (error); 1206 pn->mn_mode = vap->va_mode; 1207 c = 1; 1208 } 1209 1210 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1211 /* See the comment in ufs_vnops::ufs_setattr(). */ 1212 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1213 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1214 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1215 return (error); 1216 if (vap->va_atime.tv_sec != VNOVAL) { 1217 pn->mn_atime = vap->va_atime; 1218 } 1219 if (vap->va_mtime.tv_sec != VNOVAL) { 1220 pn->mn_mtime = vap->va_mtime; 1221 } 1222 c = 1; 1223 } 1224 if (c) { 1225 vfs_timestamp(&pn->mn_ctime); 1226 } 1227 return (0); 1228} 1229 1230#if 0 1231struct vop_read_args { 1232 struct vop_generic_args a_gen; 1233 struct vnode *a_vp; 1234 struct uio *a_uio; 1235 int a_ioflag; 1236 struct ucred *a_cred; 1237}; 1238#endif 1239 1240/* 1241 * Read from a file 1242 */ 1243static int 1244mqfs_read(struct vop_read_args *ap) 1245{ 1246 char buf[80]; 1247 struct vnode *vp = ap->a_vp; 1248 struct uio *uio = ap->a_uio; 1249 struct mqfs_node *pn; 1250 struct mqueue *mq; 1251 int len, error; 1252 1253 if (vp->v_type != VREG) 1254 return (EINVAL); 1255 1256 pn = VTON(vp); 1257 mq = VTOMQ(vp); 1258 snprintf(buf, sizeof(buf), 1259 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n", 1260 mq->mq_totalbytes, 1261 mq->mq_maxmsg, 1262 mq->mq_curmsgs, 1263 mq->mq_msgsize); 1264 buf[sizeof(buf)-1] = '\0'; 1265 len = strlen(buf); 1266 error = uiomove_frombuf(buf, len, uio); 1267 return (error); 1268} 1269 1270#if 0 1271struct vop_readdir_args { 1272 struct vop_generic_args a_gen; 1273 struct vnode *a_vp; 1274 struct uio *a_uio; 1275 struct ucred *a_cred; 1276 int *a_eofflag; 1277 int *a_ncookies; 1278 u_long **a_cookies; 1279}; 1280#endif 1281 1282/* 1283 * Return directory entries. 1284 */ 1285static int 1286mqfs_readdir(struct vop_readdir_args *ap) 1287{ 1288 struct vnode *vp; 1289 struct mqfs_info *mi; 1290 struct mqfs_node *pd; 1291 struct mqfs_node *pn; 1292 struct dirent entry; 1293 struct uio *uio; 1294 int *tmp_ncookies = NULL; 1295 off_t offset; 1296 int error, i; 1297 1298 vp = ap->a_vp; 1299 mi = VFSTOMQFS(vp->v_mount); 1300 pd = VTON(vp); 1301 uio = ap->a_uio; 1302 1303 if (vp->v_type != VDIR) 1304 return (ENOTDIR); 1305 1306 if (uio->uio_offset < 0) 1307 return (EINVAL); 1308 1309 if (ap->a_ncookies != NULL) { 1310 tmp_ncookies = ap->a_ncookies; 1311 *ap->a_ncookies = 0; 1312 ap->a_ncookies = NULL; 1313 } 1314 1315 error = 0; 1316 offset = 0; 1317 1318 sx_xlock(&mi->mi_lock); 1319 1320 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) { 1321 entry.d_reclen = sizeof(entry); 1322 if (!pn->mn_fileno) 1323 mqfs_fileno_alloc(mi, pn); 1324 entry.d_fileno = pn->mn_fileno; 1325 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i) 1326 entry.d_name[i] = pn->mn_name[i]; 1327 entry.d_name[i] = 0; 1328 entry.d_namlen = i; 1329 switch (pn->mn_type) { 1330 case mqfstype_root: 1331 case mqfstype_dir: 1332 case mqfstype_this: 1333 case mqfstype_parent: 1334 entry.d_type = DT_DIR; 1335 break; 1336 case mqfstype_file: 1337 entry.d_type = DT_REG; 1338 break; 1339 case mqfstype_symlink: 1340 entry.d_type = DT_LNK; 1341 break; 1342 default: 1343 panic("%s has unexpected node type: %d", pn->mn_name, 1344 pn->mn_type); 1345 } 1346 if (entry.d_reclen > uio->uio_resid) 1347 break; 1348 if (offset >= uio->uio_offset) { 1349 error = vfs_read_dirent(ap, &entry, offset); 1350 if (error) 1351 break; 1352 } 1353 offset += entry.d_reclen; 1354 } 1355 sx_xunlock(&mi->mi_lock); 1356 1357 uio->uio_offset = offset; 1358 1359 if (tmp_ncookies != NULL) 1360 ap->a_ncookies = tmp_ncookies; 1361 1362 return (error); 1363} 1364 1365#ifdef notyet 1366 1367#if 0 1368struct vop_mkdir_args { 1369 struct vnode *a_dvp; 1370 struvt vnode **a_vpp; 1371 struvt componentname *a_cnp; 1372 struct vattr *a_vap; 1373}; 1374#endif 1375 1376/* 1377 * Create a directory. 1378 */ 1379static int 1380mqfs_mkdir(struct vop_mkdir_args *ap) 1381{ 1382 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1383 struct componentname *cnp = ap->a_cnp; 1384 struct mqfs_node *pd = VTON(ap->a_dvp); 1385 struct mqfs_node *pn; 1386 int error; 1387 1388 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir) 1389 return (ENOTDIR); 1390 sx_xlock(&mqfs->mi_lock); 1391#if 0 1392 /* named node */ 1393 pn = mqfs_search(pd, cnp->cn_nameptr, cnp->cn_namelen); 1394 if (pn != NULL) { 1395 sx_xunlock(&mqfs->mi_lock); 1396 return (EEXIST); 1397 } 1398#else 1399 if ((cnp->cn_flags & HASBUF) == 0) 1400 panic("%s: no name", __func__); 1401#endif 1402 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen); 1403 pn->mn_mode = ap->a_vap->va_mode; 1404 pn->mn_uid = cnp->cn_cred->cr_uid; 1405 pn->mn_gid = cnp->cn_cred->cr_gid; 1406 getnanotime(&pn->mn_birth); 1407 pn->mn_ctime = pn->mn_atime = pn->mn_mtime = pn->mn_birth; 1408 /* node attribute */ 1409 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn); 1410 sx_xunlock(&mqfs->mi_lock); 1411 return (error); 1412} 1413 1414#if 0 1415struct vop_rmdir_args { 1416 struct vnode *a_dvp; 1417 struct vnode *a_vp; 1418 struct componentname *a_cnp; 1419}; 1420#endif 1421 1422/* 1423 * Remove a directory. 1424 */ 1425static int 1426mqfs_rmdir(struct vop_rmdir_args *ap) 1427{ 1428 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount); 1429 struct mqfs_node *pn = VTON(ap->a_vp); 1430 struct mqfs_node *pt; 1431 1432 if (pn->mn_type != mqfstype_dir) 1433 return (ENOTDIR); 1434 1435 sx_xlock(&mqfs->mi_lock); 1436 if (pn->mn_deleted) { 1437 sx_xunlock(&mqfs->mi_lock); 1438 return (ENOENT); 1439 } 1440 1441 pt = LIST_FIRST(&pn->mn_children); 1442 pt = LIST_NEXT(pt, mn_sibling); 1443 pt = LIST_NEXT(pt, mn_sibling); 1444 if (pt != NULL) { 1445 sx_xunlock(&mqfs->mi_lock); 1446 return (ENOTEMPTY); 1447 } 1448 pt = pn->mn_parent; 1449 pn->mn_parent = NULL; 1450 pn->mn_deleted = 1; 1451 LIST_REMOVE(pn, mn_sibling); 1452 mqnode_release(pn); 1453 mqnode_release(pt); 1454 sx_xunlock(&mqfs->mi_lock); 1455 cache_purge(ap->a_vp); 1456 return (0); 1457} 1458 1459#endif /* notyet */ 1460 1461/* 1462 * Allocate a message queue 1463 */ 1464static struct mqueue * 1465mqueue_alloc(const struct mq_attr *attr) 1466{ 1467 struct mqueue *mq; 1468 1469 if (curmq >= maxmq) 1470 return (NULL); 1471 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO); 1472 TAILQ_INIT(&mq->mq_msgq); 1473 if (attr != NULL) { 1474 mq->mq_maxmsg = attr->mq_maxmsg; 1475 mq->mq_msgsize = attr->mq_msgsize; 1476 } else { 1477 mq->mq_maxmsg = default_maxmsg; 1478 mq->mq_msgsize = default_msgsize; 1479 } 1480 mtx_init(&mq->mq_mutex, "mqueue", NULL, MTX_DEF); 1481 knlist_init(&mq->mq_rsel.si_note, &mq->mq_mutex, NULL, NULL, NULL); 1482 knlist_init(&mq->mq_wsel.si_note, &mq->mq_mutex, NULL, NULL, NULL); 1483 atomic_add_int(&curmq, 1); 1484 return (mq); 1485} 1486 1487/* 1488 * Destroy a message queue 1489 */ 1490static void 1491mqueue_free(struct mqueue *mq) 1492{ 1493 struct mqueue_msg *msg; 1494 1495 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) { 1496 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link); 1497 FREE(msg, M_MQUEUEDATA); 1498 } 1499 1500 mtx_destroy(&mq->mq_mutex); 1501 knlist_destroy(&mq->mq_rsel.si_note); 1502 knlist_destroy(&mq->mq_wsel.si_note); 1503 uma_zfree(mqueue_zone, mq); 1504 atomic_add_int(&curmq, -1); 1505} 1506 1507/* 1508 * Load a message from user space 1509 */ 1510static struct mqueue_msg * 1511mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio) 1512{ 1513 struct mqueue_msg *msg; 1514 size_t len; 1515 int error; 1516 1517 len = sizeof(struct mqueue_msg) + msg_size; 1518 MALLOC(msg, struct mqueue_msg *, len, M_MQUEUEDATA, M_WAITOK); 1519 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg), 1520 msg_size); 1521 if (error) { 1522 FREE(msg, M_MQUEUEDATA); 1523 msg = NULL; 1524 } else { 1525 msg->msg_size = msg_size; 1526 msg->msg_prio = msg_prio; 1527 } 1528 return (msg); 1529} 1530 1531/* 1532 * Save a message to user space 1533 */ 1534static int 1535mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio) 1536{ 1537 int error; 1538 1539 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr, 1540 msg->msg_size); 1541 if (error == 0 && msg_prio != NULL) 1542 error = copyout(&msg->msg_prio, msg_prio, sizeof(int)); 1543 return (error); 1544} 1545 1546/* 1547 * Free a message's memory 1548 */ 1549static __inline void 1550mqueue_freemsg(struct mqueue_msg *msg) 1551{ 1552 FREE(msg, M_MQUEUEDATA); 1553} 1554 1555/* 1556 * Send a message. if waitok is false, thread will not be 1557 * blocked if there is no data in queue, otherwise, absolute 1558 * time will be checked. 1559 */ 1560int 1561mqueue_send(struct mqueue *mq, const char *msg_ptr, 1562 size_t msg_len, unsigned msg_prio, int waitok, 1563 const struct timespec *abs_timeout) 1564{ 1565 struct mqueue_msg *msg; 1566 struct timespec ets, ts, ts2; 1567 struct timeval tv; 1568 int error; 1569 1570 if (msg_prio >= MQ_PRIO_MAX) 1571 return (EINVAL); 1572 if (msg_len > mq->mq_msgsize) 1573 return (EMSGSIZE); 1574 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio); 1575 if (msg == NULL) 1576 return (EFAULT); 1577 1578 /* O_NONBLOCK case */ 1579 if (!waitok) { 1580 error = _mqueue_send(mq, msg, -1); 1581 if (error) 1582 goto bad; 1583 return (0); 1584 } 1585 1586 /* we allow a null timeout (wait forever) */ 1587 if (abs_timeout == NULL) { 1588 error = _mqueue_send(mq, msg, 0); 1589 if (error) 1590 goto bad; 1591 return (0); 1592 } 1593 1594 /* send it before checking time */ 1595 error = _mqueue_send(mq, msg, -1); 1596 if (error == 0) 1597 return (0); 1598 1599 if (error != EAGAIN) 1600 goto bad; 1601 1602 error = copyin(abs_timeout, &ets, sizeof(ets)); 1603 if (error != 0) 1604 goto bad; 1605 if (ets.tv_nsec >= 1000000000 || ets.tv_nsec < 0) { 1606 error = EINVAL; 1607 goto bad; 1608 } 1609 for (;;) { 1610 ts2 = ets; 1611 getnanotime(&ts); 1612 timespecsub(&ts2, &ts); 1613 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1614 error = ETIMEDOUT; 1615 break; 1616 } 1617 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1618 error = _mqueue_send(mq, msg, tvtohz(&tv)); 1619 if (error != ETIMEDOUT) 1620 break; 1621 } 1622 if (error == 0) 1623 return (0); 1624bad: 1625 mqueue_freemsg(msg); 1626 return (error); 1627} 1628 1629/* 1630 * Common routine to send a message 1631 */ 1632static int 1633_mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo) 1634{ 1635 struct mqueue_msg *msg2; 1636 int error = 0; 1637 1638 mtx_lock(&mq->mq_mutex); 1639 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) { 1640 if (timo < 0) { 1641 mtx_unlock(&mq->mq_mutex); 1642 return (EAGAIN); 1643 } 1644 mq->mq_senders++; 1645 error = msleep(&mq->mq_senders, &mq->mq_mutex, 1646 PSOCK | PCATCH, "mqsend", timo); 1647 mq->mq_senders--; 1648 if (error == EAGAIN) 1649 error = ETIMEDOUT; 1650 } 1651 if (mq->mq_curmsgs >= mq->mq_maxmsg) { 1652 mtx_unlock(&mq->mq_mutex); 1653 return (error); 1654 } 1655 error = 0; 1656 if (TAILQ_EMPTY(&mq->mq_msgq)) { 1657 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link); 1658 } else { 1659 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) { 1660 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link); 1661 } else { 1662 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) { 1663 if (msg2->msg_prio < msg->msg_prio) 1664 break; 1665 } 1666 TAILQ_INSERT_BEFORE(msg2, msg, msg_link); 1667 } 1668 } 1669 mq->mq_curmsgs++; 1670 mq->mq_totalbytes += msg->msg_size; 1671 if (mq->mq_receivers) 1672 wakeup_one(&mq->mq_receivers); 1673 else if (mq->mq_notifier != NULL) 1674 mqueue_send_notification(mq); 1675 if (mq->mq_flags & MQ_RSEL) { 1676 mq->mq_flags &= ~MQ_RSEL; 1677 selwakeuppri(&mq->mq_rsel, PSOCK); 1678 } 1679 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0); 1680 mtx_unlock(&mq->mq_mutex); 1681 return (0); 1682} 1683 1684/* 1685 * Send realtime a signal to process which registered itself 1686 * successfully by mq_notify. 1687 */ 1688static void 1689mqueue_send_notification(struct mqueue *mq) 1690{ 1691 struct mqueue_notifier *nt; 1692 struct proc *p; 1693 1694 mtx_assert(&mq->mq_mutex, MA_OWNED); 1695 nt = mq->mq_notifier; 1696 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) { 1697 p = nt->nt_proc; 1698 PROC_LOCK(p); 1699 if (!KSI_ONQ(&nt->nt_ksi)) 1700 psignal_event(p, &nt->nt_sigev, &nt->nt_ksi); 1701 PROC_UNLOCK(p); 1702 } 1703 mq->mq_notifier = NULL; 1704} 1705 1706/* 1707 * Get a message. if waitok is false, thread will not be 1708 * blocked if there is no data in queue, otherwise, absolute 1709 * time will be checked. 1710 */ 1711int 1712mqueue_receive(struct mqueue *mq, char *msg_ptr, 1713 size_t msg_len, unsigned *msg_prio, int waitok, 1714 const struct timespec *abs_timeout) 1715{ 1716 struct mqueue_msg *msg; 1717 struct timespec ets, ts, ts2; 1718 struct timeval tv; 1719 int error; 1720 1721 if (msg_len < mq->mq_msgsize) 1722 return (EMSGSIZE); 1723 1724 /* O_NONBLOCK case */ 1725 if (!waitok) { 1726 error = _mqueue_recv(mq, &msg, -1); 1727 if (error) 1728 return (error); 1729 goto received; 1730 } 1731 1732 /* we allow a null timeout (wait forever). */ 1733 if (abs_timeout == NULL) { 1734 error = _mqueue_recv(mq, &msg, 0); 1735 if (error) 1736 return (error); 1737 goto received; 1738 } 1739 1740 /* try to get a message before checking time */ 1741 error = _mqueue_recv(mq, &msg, -1); 1742 if (error == 0) 1743 goto received; 1744 1745 if (error != EAGAIN) 1746 return (error); 1747 1748 error = copyin(abs_timeout, &ets, sizeof(ets)); 1749 if (error != 0) 1750 return (error); 1751 if (ets.tv_nsec >= 1000000000 || ets.tv_nsec < 0) { 1752 error = EINVAL; 1753 return (error); 1754 } 1755 1756 for (;;) { 1757 ts2 = ets; 1758 getnanotime(&ts); 1759 timespecsub(&ts2, &ts); 1760 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) { 1761 error = ETIMEDOUT; 1762 return (error); 1763 } 1764 TIMESPEC_TO_TIMEVAL(&tv, &ts2); 1765 error = _mqueue_recv(mq, &msg, tvtohz(&tv)); 1766 if (error == 0) 1767 break; 1768 if (error != ETIMEDOUT) 1769 return (error); 1770 } 1771 1772received: 1773 error = mqueue_savemsg(msg, msg_ptr, msg_prio); 1774 if (error == 0) { 1775 curthread->td_retval[0] = msg->msg_size; 1776 curthread->td_retval[1] = 0; 1777 } 1778 mqueue_freemsg(msg); 1779 return (error); 1780} 1781 1782/* 1783 * Common routine to receive a message 1784 */ 1785static int 1786_mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo) 1787{ 1788 int error = 0; 1789 1790 mtx_lock(&mq->mq_mutex); 1791 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) { 1792 if (timo < 0) { 1793 mtx_unlock(&mq->mq_mutex); 1794 return (EAGAIN); 1795 } 1796 mq->mq_receivers++; 1797 error = msleep(&mq->mq_receivers, &mq->mq_mutex, 1798 PSOCK | PCATCH, "mqrecv", timo); 1799 mq->mq_receivers--; 1800 if (error == EAGAIN) 1801 error = ETIMEDOUT; 1802 } 1803 if (*msg != NULL) { 1804 error = 0; 1805 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link); 1806 mq->mq_curmsgs--; 1807 mq->mq_totalbytes -= (*msg)->msg_size; 1808 if (mq->mq_senders) 1809 wakeup_one(&mq->mq_senders); 1810 if (mq->mq_flags & MQ_WSEL) { 1811 mq->mq_flags &= ~MQ_WSEL; 1812 selwakeuppri(&mq->mq_wsel, PSOCK); 1813 } 1814 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0); 1815 } 1816 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 && 1817 !TAILQ_EMPTY(&mq->mq_msgq)) { 1818 mqueue_send_notification(mq); 1819 } 1820 mtx_unlock(&mq->mq_mutex); 1821 return (error); 1822} 1823 1824static __inline struct mqueue_notifier * 1825notifier_alloc(void) 1826{ 1827 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO)); 1828} 1829 1830static __inline void 1831notifier_free(struct mqueue_notifier *p) 1832{ 1833 uma_zfree(mqnoti_zone, p); 1834} 1835 1836static struct mqueue_notifier * 1837notifier_search(struct proc *p, int fd) 1838{ 1839 struct mqueue_notifier *nt; 1840 1841 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) { 1842 if (nt->nt_ksi.ksi_mqd == fd) 1843 break; 1844 } 1845 return (nt); 1846} 1847 1848static void 1849notifier_insert(struct proc *p, struct mqueue_notifier *nt) 1850{ 1851 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link); 1852} 1853 1854static void 1855notifier_delete(struct proc *p, struct mqueue_notifier *nt) 1856{ 1857 LIST_REMOVE(nt, nt_link); 1858 notifier_free(nt); 1859} 1860 1861static void 1862notifier_remove(struct proc *p, struct mqueue *mq, int fd) 1863{ 1864 struct mqueue_notifier *nt; 1865 1866 mtx_assert(&mq->mq_mutex, MA_OWNED); 1867 PROC_LOCK(p); 1868 nt = notifier_search(p, fd); 1869 if (nt != NULL) { 1870 if (mq->mq_notifier == nt) 1871 mq->mq_notifier = NULL; 1872 sigqueue_take(&nt->nt_ksi); 1873 notifier_delete(p, nt); 1874 } 1875 PROC_UNLOCK(p); 1876} 1877 1878/* 1879 * Syscall to open a message queue 1880 */ 1881int 1882mq_open(struct thread *td, struct mq_open_args *uap) 1883{ 1884 char path[MQFS_NAMELEN + 1]; 1885 struct mq_attr attr, *pattr; 1886 struct mqfs_node *pn; 1887 struct filedesc *fdp; 1888 struct file *fp; 1889 struct mqueue *mq; 1890 int fd, error, len, flags, cmode; 1891 1892 if ((uap->flags & O_ACCMODE) == O_ACCMODE) 1893 return (EINVAL); 1894 1895 fdp = td->td_proc->p_fd; 1896 flags = FFLAGS(uap->flags); 1897 cmode = (((uap->mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT); 1898 mq = NULL; 1899 if ((flags & O_CREAT) && (uap->attr != NULL)) { 1900 error = copyin(uap->attr, &attr, sizeof(attr)); 1901 if (error) 1902 return (error); 1903 if (attr.mq_maxmsg <= 0 || attr.mq_maxmsg > maxmsg) 1904 return (EINVAL); 1905 if (attr.mq_msgsize <= 0 || attr.mq_msgsize > maxmsgsize) 1906 return (EINVAL); 1907 pattr = &attr; 1908 } else 1909 pattr = NULL; 1910 1911 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL); 1912 if (error) 1913 return (error); 1914 1915 /* 1916 * The first character of name must be a slash (/) character 1917 * and the remaining characters of name cannot include any slash 1918 * characters. 1919 */ 1920 len = strlen(path); 1921 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL) 1922 return (EINVAL); 1923 1924 error = falloc(td, &fp, &fd); 1925 if (error) 1926 return (error); 1927 1928 sx_xlock(&mqfs_data.mi_lock); 1929 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1); 1930 if (pn == NULL) { 1931 if (!(flags & O_CREAT)) { 1932 error = ENOENT; 1933 } else { 1934 mq = mqueue_alloc(pattr); 1935 if (mq == NULL) { 1936 error = ENFILE; 1937 } else { 1938 pn = mqfs_create_file(mqfs_data.mi_root, 1939 path + 1, len - 1); 1940 if (pn == NULL) { 1941 error = ENOSPC; 1942 mqueue_free(mq); 1943 } 1944 } 1945 } 1946 1947 if (error == 0) { 1948 pn->mn_data = mq; 1949 getnanotime(&pn->mn_birth); 1950 pn->mn_ctime = pn->mn_atime = pn->mn_mtime 1951 = pn->mn_birth; 1952 pn->mn_uid = td->td_ucred->cr_uid; 1953 pn->mn_gid = td->td_ucred->cr_gid; 1954 pn->mn_mode = cmode; 1955 } 1956 } else { 1957 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) { 1958 error = EEXIST; 1959 } else { 1960 int acc_mode = 0; 1961 1962 if (flags & FREAD) 1963 acc_mode |= VREAD; 1964 if (flags & FWRITE) 1965 acc_mode |= VWRITE; 1966 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, 1967 pn->mn_gid, acc_mode, td->td_ucred, NULL); 1968 } 1969 } 1970 1971 if (error) { 1972 sx_xunlock(&mqfs_data.mi_lock); 1973 fdclose(fdp, fp, fd, td); 1974 fdrop(fp, td); 1975 return (error); 1976 } 1977 1978 mqnode_addref(pn); 1979 sx_xunlock(&mqfs_data.mi_lock); 1980 1981 FILE_LOCK(fp); 1982 fp->f_flag = (flags & (FREAD | FWRITE | O_NONBLOCK)); 1983 fp->f_type = DTYPE_MQUEUE; 1984 fp->f_ops = &mqueueops; 1985 fp->f_data = pn; 1986 FILE_UNLOCK(fp); 1987 1988 FILEDESC_LOCK_FAST(fdp); 1989 if (fdp->fd_ofiles[fd] == fp) 1990 fdp->fd_ofileflags[fd] |= UF_EXCLOSE; 1991 FILEDESC_UNLOCK_FAST(fdp); 1992 td->td_retval[0] = fd; 1993 fdrop(fp, td); 1994 return (0); 1995} 1996 1997/* 1998 * Syscall to unlink a message queue 1999 */ 2000int 2001mq_unlink(struct thread *td, struct mq_unlink_args *uap) 2002{ 2003 char path[MQFS_NAMELEN+1]; 2004 struct mqfs_node *pn; 2005 int error, len; 2006 2007 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL); 2008 if (error) 2009 return (error); 2010 2011 len = strlen(path); 2012 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL) 2013 return (EINVAL); 2014 2015 sx_xlock(&mqfs_data.mi_lock); 2016 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1); 2017 if (pn != NULL) 2018 error = do_unlink(pn, td->td_ucred); 2019 else 2020 error = ENOENT; 2021 sx_xunlock(&mqfs_data.mi_lock); 2022 return (error); 2023} 2024 2025typedef int (*_fgetf)(struct thread *, int, struct file **); 2026 2027/* 2028 * Get message queue by giving file slot 2029 */ 2030static int 2031_getmq(struct thread *td, int fd, _fgetf func, 2032 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq) 2033{ 2034 struct mqfs_node *pn; 2035 int error; 2036 2037 error = func(td, fd, fpp); 2038 if (error) 2039 return (error); 2040 if (&mqueueops != (*fpp)->f_ops) { 2041 fdrop(*fpp, td); 2042 return (EBADF); 2043 } 2044 pn = (*fpp)->f_data; 2045 if (ppn) 2046 *ppn = pn; 2047 if (pmq) 2048 *pmq = pn->mn_data; 2049 return (0); 2050} 2051 2052static __inline int 2053getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, 2054 struct mqueue **pmq) 2055{ 2056 return _getmq(td, fd, fget, fpp, ppn, pmq); 2057} 2058 2059static __inline int 2060getmq_read(struct thread *td, int fd, struct file **fpp, 2061 struct mqfs_node **ppn, struct mqueue **pmq) 2062{ 2063 return _getmq(td, fd, fget_read, fpp, ppn, pmq); 2064} 2065 2066static __inline int 2067getmq_write(struct thread *td, int fd, struct file **fpp, 2068 struct mqfs_node **ppn, struct mqueue **pmq) 2069{ 2070 return _getmq(td, fd, fget_write, fpp, ppn, pmq); 2071} 2072 2073/* 2074 * Syscall 2075 */ 2076int 2077mq_setattr(struct thread *td, struct mq_setattr_args *uap) 2078{ 2079 struct mqueue *mq; 2080 struct file *fp; 2081 struct mq_attr attr, oattr; 2082 int error; 2083 2084 if (uap->attr) { 2085 error = copyin(uap->attr, &attr, sizeof(attr)); 2086 if (error) 2087 return (error); 2088 if (attr.mq_flags & ~O_NONBLOCK) 2089 return (EINVAL); 2090 } 2091 error = getmq(td, uap->mqd, &fp, NULL, &mq); 2092 if (error) 2093 return (error); 2094 oattr.mq_maxmsg = mq->mq_maxmsg; 2095 oattr.mq_msgsize = mq->mq_msgsize; 2096 oattr.mq_curmsgs = mq->mq_curmsgs; 2097 FILE_LOCK(fp); 2098 oattr.mq_flags = (O_NONBLOCK & fp->f_flag); 2099 if (uap->attr) { 2100 fp->f_flag &= ~O_NONBLOCK; 2101 fp->f_flag |= (attr.mq_flags & O_NONBLOCK); 2102 } 2103 FILE_UNLOCK(fp); 2104 fdrop(fp, td); 2105 if (uap->oattr) 2106 error = copyout(&oattr, uap->oattr, sizeof(oattr)); 2107 return (error); 2108} 2109 2110/* 2111 * Syscall 2112 */ 2113int 2114mq_timedreceive(struct thread *td, struct mq_timedreceive_args *uap) 2115{ 2116 struct mqueue *mq; 2117 struct file *fp; 2118 int error; 2119 int waitok; 2120 2121 error = getmq_read(td, uap->mqd, &fp, NULL, &mq); 2122 if (error) 2123 return (error); 2124 waitok = !(fp->f_flag & O_NONBLOCK); 2125 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len, 2126 uap->msg_prio, waitok, uap->abs_timeout); 2127 fdrop(fp, td); 2128 return (error); 2129} 2130 2131/* 2132 * Syscall 2133 */ 2134int 2135mq_timedsend(struct thread *td, struct mq_timedsend_args *uap) 2136{ 2137 struct mqueue *mq; 2138 struct file *fp; 2139 int error, waitok; 2140 2141 error = getmq_write(td, uap->mqd, &fp, NULL, &mq); 2142 if (error) 2143 return (error); 2144 waitok = !(fp->f_flag & O_NONBLOCK); 2145 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len, 2146 uap->msg_prio, waitok, uap->abs_timeout); 2147 fdrop(fp, td); 2148 return (error); 2149} 2150 2151/* 2152 * Syscall 2153 */ 2154int 2155mq_notify(struct thread *td, struct mq_notify_args *uap) 2156{ 2157 struct sigevent ev; 2158 struct filedesc *fdp; 2159 struct proc *p; 2160 struct mqueue *mq; 2161 struct file *fp; 2162 struct mqueue_notifier *nt, *newnt = NULL; 2163 int error; 2164 2165 p = td->td_proc; 2166 fdp = td->td_proc->p_fd; 2167 if (uap->sigev) { 2168 error = copyin(uap->sigev, &ev, sizeof(ev)); 2169 if (error) 2170 return (error); 2171 if (ev.sigev_notify != SIGEV_SIGNAL && 2172 ev.sigev_notify != SIGEV_THREAD_ID && 2173 ev.sigev_notify != SIGEV_NONE) 2174 return (EINVAL); 2175 if ((ev.sigev_notify == SIGEV_SIGNAL || 2176 ev.sigev_notify == SIGEV_THREAD_ID) && 2177 !_SIG_VALID(ev.sigev_signo)) 2178 return (EINVAL); 2179 } 2180 error = getmq(td, uap->mqd, &fp, NULL, &mq); 2181 if (error) 2182 return (error); 2183again: 2184 FILEDESC_LOCK_FAST(fdp); 2185 if (fget_locked(fdp, uap->mqd) != fp) { 2186 FILEDESC_UNLOCK_FAST(fdp); 2187 error = EBADF; 2188 goto out; 2189 } 2190 mtx_lock(&mq->mq_mutex); 2191 FILEDESC_UNLOCK_FAST(fdp); 2192 if (uap->sigev != NULL) { 2193 if (mq->mq_notifier != NULL) { 2194 error = EBUSY; 2195 } else { 2196 PROC_LOCK(p); 2197 nt = notifier_search(p, uap->mqd); 2198 if (nt == NULL) { 2199 if (newnt == NULL) { 2200 PROC_UNLOCK(p); 2201 mtx_unlock(&mq->mq_mutex); 2202 newnt = notifier_alloc(); 2203 goto again; 2204 } 2205 } 2206 2207 if (nt != NULL) { 2208 sigqueue_take(&nt->nt_ksi); 2209 if (newnt != NULL) { 2210 notifier_free(newnt); 2211 newnt = NULL; 2212 } 2213 } else { 2214 nt = newnt; 2215 newnt = NULL; 2216 ksiginfo_init(&nt->nt_ksi); 2217 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT; 2218 nt->nt_ksi.ksi_code = SI_MESGQ; 2219 nt->nt_proc = p; 2220 nt->nt_ksi.ksi_mqd = uap->mqd; 2221 notifier_insert(p, nt); 2222 } 2223 nt->nt_sigev = ev; 2224 mq->mq_notifier = nt; 2225 PROC_UNLOCK(p); 2226 /* 2227 * if there is no receivers and message queue 2228 * is not empty, we should send notification 2229 * as soon as possible. 2230 */ 2231 if (mq->mq_receivers == 0 && 2232 !TAILQ_EMPTY(&mq->mq_msgq)) 2233 mqueue_send_notification(mq); 2234 } 2235 } else { 2236 notifier_remove(p, mq, uap->mqd); 2237 } 2238 mtx_unlock(&mq->mq_mutex); 2239 2240out: 2241 fdrop(fp, td); 2242 if (newnt != NULL) 2243 notifier_free(newnt); 2244 return (error); 2245} 2246 2247static void 2248mqueue_fdclose(struct thread *td, int fd, struct file *fp) 2249{ 2250 struct filedesc *fdp; 2251 struct mqueue *mq; 2252 2253 fdp = td->td_proc->p_fd; 2254 FILEDESC_LOCK_ASSERT(fdp, MA_OWNED); 2255 if (fp->f_ops == &mqueueops) { 2256 mq = FPTOMQ(fp); 2257 mtx_lock(&mq->mq_mutex); 2258 notifier_remove(td->td_proc, mq, fd); 2259 2260 /* have to wakeup thread in same process */ 2261 if (mq->mq_flags & MQ_RSEL) { 2262 mq->mq_flags &= ~MQ_RSEL; 2263 selwakeuppri(&mq->mq_rsel, PSOCK); 2264 } 2265 if (mq->mq_flags & MQ_WSEL) { 2266 mq->mq_flags &= ~MQ_WSEL; 2267 selwakeuppri(&mq->mq_wsel, PSOCK); 2268 } 2269 mtx_unlock(&mq->mq_mutex); 2270 } 2271} 2272 2273static void 2274mq_proc_exit(void *arg __unused, struct proc *p) 2275{ 2276 struct filedesc *fdp; 2277 struct file *fp; 2278 struct mqueue *mq; 2279 int i; 2280 2281 fdp = p->p_fd; 2282 FILEDESC_LOCK_FAST(fdp); 2283 for (i = 0; i < fdp->fd_nfiles; ++i) { 2284 fp = fget_locked(fdp, i); 2285 if (fp != NULL && fp->f_ops == &mqueueops) { 2286 mq = FPTOMQ(fp); 2287 mtx_lock(&mq->mq_mutex); 2288 notifier_remove(p, FPTOMQ(fp), i); 2289 mtx_unlock(&mq->mq_mutex); 2290 } 2291 } 2292 FILEDESC_UNLOCK_FAST(fdp); 2293 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left")); 2294} 2295 2296static int 2297mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 2298 int flags, struct thread *td) 2299{ 2300 return (EOPNOTSUPP); 2301} 2302 2303static int 2304mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 2305 int flags, struct thread *td) 2306{ 2307 return (EOPNOTSUPP); 2308} 2309 2310static int 2311mqf_ioctl(struct file *fp, u_long cmd, void *data, 2312 struct ucred *active_cred, struct thread *td) 2313{ 2314 return (ENOTTY); 2315} 2316 2317static int 2318mqf_poll(struct file *fp, int events, struct ucred *active_cred, 2319 struct thread *td) 2320{ 2321 struct mqueue *mq = FPTOMQ(fp); 2322 int revents = 0; 2323 2324 mtx_lock(&mq->mq_mutex); 2325 if (events & (POLLIN | POLLRDNORM)) { 2326 if (mq->mq_curmsgs) { 2327 revents |= events & (POLLIN | POLLRDNORM); 2328 } else { 2329 mq->mq_flags |= MQ_RSEL; 2330 selrecord(td, &mq->mq_rsel); 2331 } 2332 } 2333 if (events & POLLOUT) { 2334 if (mq->mq_curmsgs < mq->mq_maxmsg) 2335 revents |= POLLOUT; 2336 else { 2337 mq->mq_flags |= MQ_WSEL; 2338 selrecord(td, &mq->mq_wsel); 2339 } 2340 } 2341 mtx_unlock(&mq->mq_mutex); 2342 return (revents); 2343} 2344 2345static int 2346mqf_close(struct file *fp, struct thread *td) 2347{ 2348 struct mqfs_node *pn; 2349 2350 FILE_LOCK(fp); 2351 fp->f_ops = &badfileops; 2352 FILE_UNLOCK(fp); 2353 pn = fp->f_data; 2354 fp->f_data = NULL; 2355 sx_xlock(&mqfs_data.mi_lock); 2356 mqnode_release(pn); 2357 sx_xunlock(&mqfs_data.mi_lock); 2358 return (0); 2359} 2360 2361static int 2362mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred, 2363 struct thread *td) 2364{ 2365 struct mqfs_node *pn = fp->f_data; 2366 2367 bzero(st, sizeof *st); 2368 st->st_atimespec = pn->mn_atime; 2369 st->st_mtimespec = pn->mn_mtime; 2370 st->st_ctimespec = pn->mn_ctime; 2371 st->st_birthtimespec = pn->mn_birth; 2372 st->st_uid = pn->mn_uid; 2373 st->st_gid = pn->mn_gid; 2374 st->st_mode = S_IFIFO | pn->mn_mode; 2375 return (0); 2376} 2377 2378static int 2379mqf_kqfilter(struct file *fp, struct knote *kn) 2380{ 2381 struct mqueue *mq = FPTOMQ(fp); 2382 int error = 0; 2383 2384 if (kn->kn_filter == EVFILT_READ) { 2385 kn->kn_fop = &mq_rfiltops; 2386 knlist_add(&mq->mq_rsel.si_note, kn, 0); 2387 } else if (kn->kn_filter == EVFILT_WRITE) { 2388 kn->kn_fop = &mq_wfiltops; 2389 knlist_add(&mq->mq_wsel.si_note, kn, 0); 2390 } else 2391 error = EINVAL; 2392 return (error); 2393} 2394 2395static void 2396filt_mqdetach(struct knote *kn) 2397{ 2398 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2399 2400 if (kn->kn_filter == EVFILT_READ) 2401 knlist_remove(&mq->mq_rsel.si_note, kn, 0); 2402 else if (kn->kn_filter == EVFILT_WRITE) 2403 knlist_remove(&mq->mq_wsel.si_note, kn, 0); 2404 else 2405 panic("filt_mqdetach"); 2406} 2407 2408static int 2409filt_mqread(struct knote *kn, long hint) 2410{ 2411 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2412 2413 mtx_assert(&mq->mq_mutex, MA_OWNED); 2414 return (mq->mq_curmsgs != 0); 2415} 2416 2417static int 2418filt_mqwrite(struct knote *kn, long hint) 2419{ 2420 struct mqueue *mq = FPTOMQ(kn->kn_fp); 2421 2422 mtx_assert(&mq->mq_mutex, MA_OWNED); 2423 return (mq->mq_curmsgs < mq->mq_maxmsg); 2424} 2425 2426static struct fileops mqueueops = { 2427 .fo_read = mqf_read, 2428 .fo_write = mqf_write, 2429 .fo_ioctl = mqf_ioctl, 2430 .fo_poll = mqf_poll, 2431 .fo_kqfilter = mqf_kqfilter, 2432 .fo_stat = mqf_stat, 2433 .fo_close = mqf_close 2434}; 2435 2436static struct vop_vector mqfs_vnodeops = { 2437 .vop_default = &default_vnodeops, 2438 .vop_access = mqfs_access, 2439 .vop_cachedlookup = mqfs_lookup, 2440 .vop_lookup = vfs_cache_lookup, 2441 .vop_reclaim = mqfs_reclaim, 2442 .vop_create = mqfs_create, 2443 .vop_remove = mqfs_remove, 2444 .vop_inactive = mqfs_inactive, 2445 .vop_open = mqfs_open, 2446 .vop_close = mqfs_close, 2447 .vop_getattr = mqfs_getattr, 2448 .vop_setattr = mqfs_setattr, 2449 .vop_read = mqfs_read, 2450 .vop_write = VOP_EOPNOTSUPP, 2451 .vop_readdir = mqfs_readdir, 2452 .vop_mkdir = VOP_EOPNOTSUPP, 2453 .vop_rmdir = VOP_EOPNOTSUPP 2454}; 2455 2456static struct vfsops mqfs_vfsops = { 2457 .vfs_init = mqfs_init, 2458 .vfs_uninit = mqfs_uninit, 2459 .vfs_mount = mqfs_mount, 2460 .vfs_unmount = mqfs_unmount, 2461 .vfs_root = mqfs_root, 2462 .vfs_statfs = mqfs_statfs, 2463}; 2464 2465SYSCALL_MODULE_HELPER(mq_open); 2466SYSCALL_MODULE_HELPER(mq_setattr); 2467SYSCALL_MODULE_HELPER(mq_timedsend); 2468SYSCALL_MODULE_HELPER(mq_timedreceive); 2469SYSCALL_MODULE_HELPER(mq_notify); 2470SYSCALL_MODULE_HELPER(mq_unlink); 2471 2472VFS_SET(mqfs_vfsops, mqueuefs, VFCF_SYNTHETIC); 2473MODULE_VERSION(mqueuefs, 1); 2474