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: releng/9.0/sys/kern/uipc_mqueue.c 225617 2011-09-16 13:58:51Z kmacy $");
47
48 #include "opt_compat.h"
49
50 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/systm.h>
53 #include <sys/limits.h>
54 #include <sys/buf.h>
55 #include <sys/capability.h>
56 #include <sys/dirent.h>
57 #include <sys/event.h>
58 #include <sys/eventhandler.h>
59 #include <sys/fcntl.h>
60 #include <sys/file.h>
61 #include <sys/filedesc.h>
62 #include <sys/lock.h>
63 #include <sys/malloc.h>
64 #include <sys/module.h>
65 #include <sys/mount.h>
66 #include <sys/mqueue.h>
67 #include <sys/mutex.h>
68 #include <sys/namei.h>
69 #include <sys/posix4.h>
70 #include <sys/poll.h>
71 #include <sys/priv.h>
72 #include <sys/proc.h>
73 #include <sys/queue.h>
74 #include <sys/sysproto.h>
75 #include <sys/stat.h>
76 #include <sys/syscall.h>
77 #include <sys/syscallsubr.h>
78 #include <sys/sysent.h>
79 #include <sys/sx.h>
80 #include <sys/sysctl.h>
81 #include <sys/taskqueue.h>
82 #include <sys/unistd.h>
83 #include <sys/vnode.h>
84 #include <machine/atomic.h>
85
86 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
87
88 /*
89 * Limits and constants
90 */
91 #define MQFS_NAMELEN NAME_MAX
92 #define MQFS_DELEN (8 + MQFS_NAMELEN)
93
94 /* node types */
95 typedef enum {
96 mqfstype_none = 0,
97 mqfstype_root,
98 mqfstype_dir,
99 mqfstype_this,
100 mqfstype_parent,
101 mqfstype_file,
102 mqfstype_symlink,
103 } mqfs_type_t;
104
105 struct mqfs_node;
106
107 /*
108 * mqfs_info: describes a mqfs instance
109 */
110 struct mqfs_info {
111 struct sx mi_lock;
112 struct mqfs_node *mi_root;
113 struct unrhdr *mi_unrhdr;
114 };
115
116 struct mqfs_vdata {
117 LIST_ENTRY(mqfs_vdata) mv_link;
118 struct mqfs_node *mv_node;
119 struct vnode *mv_vnode;
120 struct task mv_task;
121 };
122
123 /*
124 * mqfs_node: describes a node (file or directory) within a mqfs
125 */
126 struct mqfs_node {
127 char mn_name[MQFS_NAMELEN+1];
128 struct mqfs_info *mn_info;
129 struct mqfs_node *mn_parent;
130 LIST_HEAD(,mqfs_node) mn_children;
131 LIST_ENTRY(mqfs_node) mn_sibling;
132 LIST_HEAD(,mqfs_vdata) mn_vnodes;
133 int mn_refcount;
134 mqfs_type_t mn_type;
135 int mn_deleted;
136 uint32_t mn_fileno;
137 void *mn_data;
138 struct timespec mn_birth;
139 struct timespec mn_ctime;
140 struct timespec mn_atime;
141 struct timespec mn_mtime;
142 uid_t mn_uid;
143 gid_t mn_gid;
144 int mn_mode;
145 };
146
147 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
148 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
149 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
150 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
151 (fp)->f_data)->mn_data))
152
153 TAILQ_HEAD(msgq, mqueue_msg);
154
155 struct mqueue;
156
157 struct mqueue_notifier {
158 LIST_ENTRY(mqueue_notifier) nt_link;
159 struct sigevent nt_sigev;
160 ksiginfo_t nt_ksi;
161 struct proc *nt_proc;
162 };
163
164 struct mqueue {
165 struct mtx mq_mutex;
166 int mq_flags;
167 long mq_maxmsg;
168 long mq_msgsize;
169 long mq_curmsgs;
170 long mq_totalbytes;
171 struct msgq mq_msgq;
172 int mq_receivers;
173 int mq_senders;
174 struct selinfo mq_rsel;
175 struct selinfo mq_wsel;
176 struct mqueue_notifier *mq_notifier;
177 };
178
179 #define MQ_RSEL 0x01
180 #define MQ_WSEL 0x02
181
182 struct mqueue_msg {
183 TAILQ_ENTRY(mqueue_msg) msg_link;
184 unsigned int msg_prio;
185 unsigned int msg_size;
186 /* following real data... */
187 };
188
189 SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
190 "POSIX real time message queue");
191
192 static int default_maxmsg = 10;
193 static int default_msgsize = 1024;
194
195 static int maxmsg = 100;
196 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
197 &maxmsg, 0, "Default maximum messages in queue");
198 static int maxmsgsize = 16384;
199 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
200 &maxmsgsize, 0, "Default maximum message size");
201 static int maxmq = 100;
202 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
203 &maxmq, 0, "maximum message queues");
204 static int curmq = 0;
205 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
206 &curmq, 0, "current message queue number");
207 static int unloadable = 0;
208 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
209
210 static eventhandler_tag exit_tag;
211
212 /* Only one instance per-system */
213 static struct mqfs_info mqfs_data;
214 static uma_zone_t mqnode_zone;
215 static uma_zone_t mqueue_zone;
216 static uma_zone_t mvdata_zone;
217 static uma_zone_t mqnoti_zone;
218 static struct vop_vector mqfs_vnodeops;
219 static struct fileops mqueueops;
220
221 /*
222 * Directory structure construction and manipulation
223 */
224 #ifdef notyet
225 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
226 const char *name, int namelen, struct ucred *cred, int mode);
227 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
228 const char *name, int namelen, struct ucred *cred, int mode);
229 #endif
230
231 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
232 const char *name, int namelen, struct ucred *cred, int mode);
233 static int mqfs_destroy(struct mqfs_node *mn);
234 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
235 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
236 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
237
238 /*
239 * Message queue construction and maniplation
240 */
241 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
242 static void mqueue_free(struct mqueue *mq);
243 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
244 size_t msg_len, unsigned msg_prio, int waitok,
245 const struct timespec *abs_timeout);
246 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
247 size_t msg_len, unsigned *msg_prio, int waitok,
248 const struct timespec *abs_timeout);
249 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
250 int timo);
251 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
252 int timo);
253 static void mqueue_send_notification(struct mqueue *mq);
254 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
255 static void mq_proc_exit(void *arg, struct proc *p);
256
257 /*
258 * kqueue filters
259 */
260 static void filt_mqdetach(struct knote *kn);
261 static int filt_mqread(struct knote *kn, long hint);
262 static int filt_mqwrite(struct knote *kn, long hint);
263
264 struct filterops mq_rfiltops = {
265 .f_isfd = 1,
266 .f_detach = filt_mqdetach,
267 .f_event = filt_mqread,
268 };
269 struct filterops mq_wfiltops = {
270 .f_isfd = 1,
271 .f_detach = filt_mqdetach,
272 .f_event = filt_mqwrite,
273 };
274
275 /*
276 * Initialize fileno bitmap
277 */
278 static void
279 mqfs_fileno_init(struct mqfs_info *mi)
280 {
281 struct unrhdr *up;
282
283 up = new_unrhdr(1, INT_MAX, NULL);
284 mi->mi_unrhdr = up;
285 }
286
287 /*
288 * Tear down fileno bitmap
289 */
290 static void
291 mqfs_fileno_uninit(struct mqfs_info *mi)
292 {
293 struct unrhdr *up;
294
295 up = mi->mi_unrhdr;
296 mi->mi_unrhdr = NULL;
297 delete_unrhdr(up);
298 }
299
300 /*
301 * Allocate a file number
302 */
303 static void
304 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
305 {
306 /* make sure our parent has a file number */
307 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
308 mqfs_fileno_alloc(mi, mn->mn_parent);
309
310 switch (mn->mn_type) {
311 case mqfstype_root:
312 case mqfstype_dir:
313 case mqfstype_file:
314 case mqfstype_symlink:
315 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
316 break;
317 case mqfstype_this:
318 KASSERT(mn->mn_parent != NULL,
319 ("mqfstype_this node has no parent"));
320 mn->mn_fileno = mn->mn_parent->mn_fileno;
321 break;
322 case mqfstype_parent:
323 KASSERT(mn->mn_parent != NULL,
324 ("mqfstype_parent node has no parent"));
325 if (mn->mn_parent == mi->mi_root) {
326 mn->mn_fileno = mn->mn_parent->mn_fileno;
327 break;
328 }
329 KASSERT(mn->mn_parent->mn_parent != NULL,
330 ("mqfstype_parent node has no grandparent"));
331 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
332 break;
333 default:
334 KASSERT(0,
335 ("mqfs_fileno_alloc() called for unknown type node: %d",
336 mn->mn_type));
337 break;
338 }
339 }
340
341 /*
342 * Release a file number
343 */
344 static void
345 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
346 {
347 switch (mn->mn_type) {
348 case mqfstype_root:
349 case mqfstype_dir:
350 case mqfstype_file:
351 case mqfstype_symlink:
352 free_unr(mi->mi_unrhdr, mn->mn_fileno);
353 break;
354 case mqfstype_this:
355 case mqfstype_parent:
356 /* ignore these, as they don't "own" their file number */
357 break;
358 default:
359 KASSERT(0,
360 ("mqfs_fileno_free() called for unknown type node: %d",
361 mn->mn_type));
362 break;
363 }
364 }
365
366 static __inline struct mqfs_node *
367 mqnode_alloc(void)
368 {
369 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
370 }
371
372 static __inline void
373 mqnode_free(struct mqfs_node *node)
374 {
375 uma_zfree(mqnode_zone, node);
376 }
377
378 static __inline void
379 mqnode_addref(struct mqfs_node *node)
380 {
381 atomic_fetchadd_int(&node->mn_refcount, 1);
382 }
383
384 static __inline void
385 mqnode_release(struct mqfs_node *node)
386 {
387 struct mqfs_info *mqfs;
388 int old, exp;
389
390 mqfs = node->mn_info;
391 old = atomic_fetchadd_int(&node->mn_refcount, -1);
392 if (node->mn_type == mqfstype_dir ||
393 node->mn_type == mqfstype_root)
394 exp = 3; /* include . and .. */
395 else
396 exp = 1;
397 if (old == exp) {
398 int locked = sx_xlocked(&mqfs->mi_lock);
399 if (!locked)
400 sx_xlock(&mqfs->mi_lock);
401 mqfs_destroy(node);
402 if (!locked)
403 sx_xunlock(&mqfs->mi_lock);
404 }
405 }
406
407 /*
408 * Add a node to a directory
409 */
410 static int
411 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
412 {
413 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
414 KASSERT(parent->mn_info != NULL,
415 ("%s(): parent has no mn_info", __func__));
416 KASSERT(parent->mn_type == mqfstype_dir ||
417 parent->mn_type == mqfstype_root,
418 ("%s(): parent is not a directory", __func__));
419
420 node->mn_info = parent->mn_info;
421 node->mn_parent = parent;
422 LIST_INIT(&node->mn_children);
423 LIST_INIT(&node->mn_vnodes);
424 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
425 mqnode_addref(parent);
426 return (0);
427 }
428
429 static struct mqfs_node *
430 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
431 int nodetype)
432 {
433 struct mqfs_node *node;
434
435 node = mqnode_alloc();
436 strncpy(node->mn_name, name, namelen);
437 node->mn_type = nodetype;
438 node->mn_refcount = 1;
439 vfs_timestamp(&node->mn_birth);
440 node->mn_ctime = node->mn_atime = node->mn_mtime
441 = node->mn_birth;
442 node->mn_uid = cred->cr_uid;
443 node->mn_gid = cred->cr_gid;
444 node->mn_mode = mode;
445 return (node);
446 }
447
448 /*
449 * Create a file
450 */
451 static struct mqfs_node *
452 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
453 struct ucred *cred, int mode)
454 {
455 struct mqfs_node *node;
456
457 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
458 if (mqfs_add_node(parent, node) != 0) {
459 mqnode_free(node);
460 return (NULL);
461 }
462 return (node);
463 }
464
465 /*
466 * Add . and .. to a directory
467 */
468 static int
469 mqfs_fixup_dir(struct mqfs_node *parent)
470 {
471 struct mqfs_node *dir;
472
473 dir = mqnode_alloc();
474 dir->mn_name[0] = '.';
475 dir->mn_type = mqfstype_this;
476 dir->mn_refcount = 1;
477 if (mqfs_add_node(parent, dir) != 0) {
478 mqnode_free(dir);
479 return (-1);
480 }
481
482 dir = mqnode_alloc();
483 dir->mn_name[0] = dir->mn_name[1] = '.';
484 dir->mn_type = mqfstype_parent;
485 dir->mn_refcount = 1;
486
487 if (mqfs_add_node(parent, dir) != 0) {
488 mqnode_free(dir);
489 return (-1);
490 }
491
492 return (0);
493 }
494
495 #ifdef notyet
496
497 /*
498 * Create a directory
499 */
500 static struct mqfs_node *
501 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
502 struct ucred *cred, int mode)
503 {
504 struct mqfs_node *node;
505
506 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
507 if (mqfs_add_node(parent, node) != 0) {
508 mqnode_free(node);
509 return (NULL);
510 }
511
512 if (mqfs_fixup_dir(node) != 0) {
513 mqfs_destroy(node);
514 return (NULL);
515 }
516 return (node);
517 }
518
519 /*
520 * Create a symlink
521 */
522 static struct mqfs_node *
523 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
524 struct ucred *cred, int mode)
525 {
526 struct mqfs_node *node;
527
528 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
529 if (mqfs_add_node(parent, node) != 0) {
530 mqnode_free(node);
531 return (NULL);
532 }
533 return (node);
534 }
535
536 #endif
537
538 /*
539 * Destroy a node or a tree of nodes
540 */
541 static int
542 mqfs_destroy(struct mqfs_node *node)
543 {
544 struct mqfs_node *parent;
545
546 KASSERT(node != NULL,
547 ("%s(): node is NULL", __func__));
548 KASSERT(node->mn_info != NULL,
549 ("%s(): node has no mn_info", __func__));
550
551 /* destroy children */
552 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
553 while (! LIST_EMPTY(&node->mn_children))
554 mqfs_destroy(LIST_FIRST(&node->mn_children));
555
556 /* unlink from parent */
557 if ((parent = node->mn_parent) != NULL) {
558 KASSERT(parent->mn_info == node->mn_info,
559 ("%s(): parent has different mn_info", __func__));
560 LIST_REMOVE(node, mn_sibling);
561 }
562
563 if (node->mn_fileno != 0)
564 mqfs_fileno_free(node->mn_info, node);
565 if (node->mn_data != NULL)
566 mqueue_free(node->mn_data);
567 mqnode_free(node);
568 return (0);
569 }
570
571 /*
572 * Mount a mqfs instance
573 */
574 static int
575 mqfs_mount(struct mount *mp)
576 {
577 struct statfs *sbp;
578
579 if (mp->mnt_flag & MNT_UPDATE)
580 return (EOPNOTSUPP);
581
582 mp->mnt_data = &mqfs_data;
583 MNT_ILOCK(mp);
584 mp->mnt_flag |= MNT_LOCAL;
585 mp->mnt_kern_flag |= MNTK_MPSAFE;
586 MNT_IUNLOCK(mp);
587 vfs_getnewfsid(mp);
588
589 sbp = &mp->mnt_stat;
590 vfs_mountedfrom(mp, "mqueue");
591 sbp->f_bsize = PAGE_SIZE;
592 sbp->f_iosize = PAGE_SIZE;
593 sbp->f_blocks = 1;
594 sbp->f_bfree = 0;
595 sbp->f_bavail = 0;
596 sbp->f_files = 1;
597 sbp->f_ffree = 0;
598 return (0);
599 }
600
601 /*
602 * Unmount a mqfs instance
603 */
604 static int
605 mqfs_unmount(struct mount *mp, int mntflags)
606 {
607 int error;
608
609 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
610 curthread);
611 return (error);
612 }
613
614 /*
615 * Return a root vnode
616 */
617 static int
618 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
619 {
620 struct mqfs_info *mqfs;
621 int ret;
622
623 mqfs = VFSTOMQFS(mp);
624 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
625 return (ret);
626 }
627
628 /*
629 * Return filesystem stats
630 */
631 static int
632 mqfs_statfs(struct mount *mp, struct statfs *sbp)
633 {
634 /* XXX update statistics */
635 return (0);
636 }
637
638 /*
639 * Initialize a mqfs instance
640 */
641 static int
642 mqfs_init(struct vfsconf *vfc)
643 {
644 struct mqfs_node *root;
645 struct mqfs_info *mi;
646
647 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
648 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
649 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
650 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
651 mvdata_zone = uma_zcreate("mvdata",
652 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
653 NULL, UMA_ALIGN_PTR, 0);
654 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
655 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
656 mi = &mqfs_data;
657 sx_init(&mi->mi_lock, "mqfs lock");
658 /* set up the root diretory */
659 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
660 mqfstype_root);
661 root->mn_info = mi;
662 LIST_INIT(&root->mn_children);
663 LIST_INIT(&root->mn_vnodes);
664 mi->mi_root = root;
665 mqfs_fileno_init(mi);
666 mqfs_fileno_alloc(mi, root);
667 mqfs_fixup_dir(root);
668 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
669 EVENTHANDLER_PRI_ANY);
670 mq_fdclose = mqueue_fdclose;
671 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
672 return (0);
673 }
674
675 /*
676 * Destroy a mqfs instance
677 */
678 static int
679 mqfs_uninit(struct vfsconf *vfc)
680 {
681 struct mqfs_info *mi;
682
683 if (!unloadable)
684 return (EOPNOTSUPP);
685 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
686 mi = &mqfs_data;
687 mqfs_destroy(mi->mi_root);
688 mi->mi_root = NULL;
689 mqfs_fileno_uninit(mi);
690 sx_destroy(&mi->mi_lock);
691 uma_zdestroy(mqnode_zone);
692 uma_zdestroy(mqueue_zone);
693 uma_zdestroy(mvdata_zone);
694 uma_zdestroy(mqnoti_zone);
695 return (0);
696 }
697
698 /*
699 * task routine
700 */
701 static void
702 do_recycle(void *context, int pending __unused)
703 {
704 struct vnode *vp = (struct vnode *)context;
705
706 vrecycle(vp, curthread);
707 vdrop(vp);
708 }
709
710 /*
711 * Allocate a vnode
712 */
713 static int
714 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
715 {
716 struct mqfs_vdata *vd;
717 struct mqfs_info *mqfs;
718 struct vnode *newvpp;
719 int error;
720
721 mqfs = pn->mn_info;
722 *vpp = NULL;
723 sx_xlock(&mqfs->mi_lock);
724 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
725 if (vd->mv_vnode->v_mount == mp) {
726 vhold(vd->mv_vnode);
727 break;
728 }
729 }
730
731 if (vd != NULL) {
732 found:
733 *vpp = vd->mv_vnode;
734 sx_xunlock(&mqfs->mi_lock);
735 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
736 vdrop(*vpp);
737 return (error);
738 }
739 sx_xunlock(&mqfs->mi_lock);
740
741 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
742 if (error)
743 return (error);
744 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
745 error = insmntque(newvpp, mp);
746 if (error != 0)
747 return (error);
748
749 sx_xlock(&mqfs->mi_lock);
750 /*
751 * Check if it has already been allocated
752 * while we were blocked.
753 */
754 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
755 if (vd->mv_vnode->v_mount == mp) {
756 vhold(vd->mv_vnode);
757 sx_xunlock(&mqfs->mi_lock);
758
759 vgone(newvpp);
760 vput(newvpp);
761 goto found;
762 }
763 }
764
765 *vpp = newvpp;
766
767 vd = uma_zalloc(mvdata_zone, M_WAITOK);
768 (*vpp)->v_data = vd;
769 vd->mv_vnode = *vpp;
770 vd->mv_node = pn;
771 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
772 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
773 mqnode_addref(pn);
774 switch (pn->mn_type) {
775 case mqfstype_root:
776 (*vpp)->v_vflag = VV_ROOT;
777 /* fall through */
778 case mqfstype_dir:
779 case mqfstype_this:
780 case mqfstype_parent:
781 (*vpp)->v_type = VDIR;
782 break;
783 case mqfstype_file:
784 (*vpp)->v_type = VREG;
785 break;
786 case mqfstype_symlink:
787 (*vpp)->v_type = VLNK;
788 break;
789 case mqfstype_none:
790 KASSERT(0, ("mqfs_allocf called for null node\n"));
791 default:
792 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
793 }
794 sx_xunlock(&mqfs->mi_lock);
795 return (0);
796 }
797
798 /*
799 * Search a directory entry
800 */
801 static struct mqfs_node *
802 mqfs_search(struct mqfs_node *pd, const char *name, int len)
803 {
804 struct mqfs_node *pn;
805
806 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
807 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
808 if (strncmp(pn->mn_name, name, len) == 0 &&
809 pn->mn_name[len] == '\0')
810 return (pn);
811 }
812 return (NULL);
813 }
814
815 /*
816 * Look up a file or directory.
817 */
818 static int
819 mqfs_lookupx(struct vop_cachedlookup_args *ap)
820 {
821 struct componentname *cnp;
822 struct vnode *dvp, **vpp;
823 struct mqfs_node *pd;
824 struct mqfs_node *pn;
825 struct mqfs_info *mqfs;
826 int nameiop, flags, error, namelen;
827 char *pname;
828 struct thread *td;
829
830 cnp = ap->a_cnp;
831 vpp = ap->a_vpp;
832 dvp = ap->a_dvp;
833 pname = cnp->cn_nameptr;
834 namelen = cnp->cn_namelen;
835 td = cnp->cn_thread;
836 flags = cnp->cn_flags;
837 nameiop = cnp->cn_nameiop;
838 pd = VTON(dvp);
839 pn = NULL;
840 mqfs = pd->mn_info;
841 *vpp = NULLVP;
842
843 if (dvp->v_type != VDIR)
844 return (ENOTDIR);
845
846 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
847 if (error)
848 return (error);
849
850 /* shortcut: check if the name is too long */
851 if (cnp->cn_namelen >= MQFS_NAMELEN)
852 return (ENOENT);
853
854 /* self */
855 if (namelen == 1 && pname[0] == '.') {
856 if ((flags & ISLASTCN) && nameiop != LOOKUP)
857 return (EINVAL);
858 pn = pd;
859 *vpp = dvp;
860 VREF(dvp);
861 return (0);
862 }
863
864 /* parent */
865 if (cnp->cn_flags & ISDOTDOT) {
866 if (dvp->v_vflag & VV_ROOT)
867 return (EIO);
868 if ((flags & ISLASTCN) && nameiop != LOOKUP)
869 return (EINVAL);
870 VOP_UNLOCK(dvp, 0);
871 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
872 pn = pd->mn_parent;
873 error = mqfs_allocv(dvp->v_mount, vpp, pn);
874 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
875 return (error);
876 }
877
878 /* named node */
879 sx_xlock(&mqfs->mi_lock);
880 pn = mqfs_search(pd, pname, namelen);
881 if (pn != NULL)
882 mqnode_addref(pn);
883 sx_xunlock(&mqfs->mi_lock);
884
885 /* found */
886 if (pn != NULL) {
887 /* DELETE */
888 if (nameiop == DELETE && (flags & ISLASTCN)) {
889 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
890 if (error) {
891 mqnode_release(pn);
892 return (error);
893 }
894 if (*vpp == dvp) {
895 VREF(dvp);
896 *vpp = dvp;
897 mqnode_release(pn);
898 return (0);
899 }
900 }
901
902 /* allocate vnode */
903 error = mqfs_allocv(dvp->v_mount, vpp, pn);
904 mqnode_release(pn);
905 if (error == 0 && cnp->cn_flags & MAKEENTRY)
906 cache_enter(dvp, *vpp, cnp);
907 return (error);
908 }
909
910 /* not found */
911
912 /* will create a new entry in the directory ? */
913 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
914 && (flags & ISLASTCN)) {
915 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
916 if (error)
917 return (error);
918 cnp->cn_flags |= SAVENAME;
919 return (EJUSTRETURN);
920 }
921 return (ENOENT);
922 }
923
924 #if 0
925 struct vop_lookup_args {
926 struct vop_generic_args a_gen;
927 struct vnode *a_dvp;
928 struct vnode **a_vpp;
929 struct componentname *a_cnp;
930 };
931 #endif
932
933 /*
934 * vnode lookup operation
935 */
936 static int
937 mqfs_lookup(struct vop_cachedlookup_args *ap)
938 {
939 int rc;
940
941 rc = mqfs_lookupx(ap);
942 return (rc);
943 }
944
945 #if 0
946 struct vop_create_args {
947 struct vnode *a_dvp;
948 struct vnode **a_vpp;
949 struct componentname *a_cnp;
950 struct vattr *a_vap;
951 };
952 #endif
953
954 /*
955 * vnode creation operation
956 */
957 static int
958 mqfs_create(struct vop_create_args *ap)
959 {
960 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
961 struct componentname *cnp = ap->a_cnp;
962 struct mqfs_node *pd;
963 struct mqfs_node *pn;
964 struct mqueue *mq;
965 int error;
966
967 pd = VTON(ap->a_dvp);
968 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
969 return (ENOTDIR);
970 mq = mqueue_alloc(NULL);
971 if (mq == NULL)
972 return (EAGAIN);
973 sx_xlock(&mqfs->mi_lock);
974 if ((cnp->cn_flags & HASBUF) == 0)
975 panic("%s: no name", __func__);
976 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
977 cnp->cn_cred, ap->a_vap->va_mode);
978 if (pn == NULL) {
979 sx_xunlock(&mqfs->mi_lock);
980 error = ENOSPC;
981 } else {
982 mqnode_addref(pn);
983 sx_xunlock(&mqfs->mi_lock);
984 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
985 mqnode_release(pn);
986 if (error)
987 mqfs_destroy(pn);
988 else
989 pn->mn_data = mq;
990 }
991 if (error)
992 mqueue_free(mq);
993 return (error);
994 }
995
996 /*
997 * Remove an entry
998 */
999 static
1000 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
1001 {
1002 struct mqfs_node *parent;
1003 struct mqfs_vdata *vd;
1004 int error = 0;
1005
1006 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1007
1008 if (ucred->cr_uid != pn->mn_uid &&
1009 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1010 error = EACCES;
1011 else if (!pn->mn_deleted) {
1012 parent = pn->mn_parent;
1013 pn->mn_parent = NULL;
1014 pn->mn_deleted = 1;
1015 LIST_REMOVE(pn, mn_sibling);
1016 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1017 cache_purge(vd->mv_vnode);
1018 vhold(vd->mv_vnode);
1019 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1020 }
1021 mqnode_release(pn);
1022 mqnode_release(parent);
1023 } else
1024 error = ENOENT;
1025 return (error);
1026 }
1027
1028 #if 0
1029 struct vop_remove_args {
1030 struct vnode *a_dvp;
1031 struct vnode *a_vp;
1032 struct componentname *a_cnp;
1033 };
1034 #endif
1035
1036 /*
1037 * vnode removal operation
1038 */
1039 static int
1040 mqfs_remove(struct vop_remove_args *ap)
1041 {
1042 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1043 struct mqfs_node *pn;
1044 int error;
1045
1046 if (ap->a_vp->v_type == VDIR)
1047 return (EPERM);
1048 pn = VTON(ap->a_vp);
1049 sx_xlock(&mqfs->mi_lock);
1050 error = do_unlink(pn, ap->a_cnp->cn_cred);
1051 sx_xunlock(&mqfs->mi_lock);
1052 return (error);
1053 }
1054
1055 #if 0
1056 struct vop_inactive_args {
1057 struct vnode *a_vp;
1058 struct thread *a_td;
1059 };
1060 #endif
1061
1062 static int
1063 mqfs_inactive(struct vop_inactive_args *ap)
1064 {
1065 struct mqfs_node *pn = VTON(ap->a_vp);
1066
1067 if (pn->mn_deleted)
1068 vrecycle(ap->a_vp, ap->a_td);
1069 return (0);
1070 }
1071
1072 #if 0
1073 struct vop_reclaim_args {
1074 struct vop_generic_args a_gen;
1075 struct vnode *a_vp;
1076 struct thread *a_td;
1077 };
1078 #endif
1079
1080 static int
1081 mqfs_reclaim(struct vop_reclaim_args *ap)
1082 {
1083 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1084 struct vnode *vp = ap->a_vp;
1085 struct mqfs_node *pn;
1086 struct mqfs_vdata *vd;
1087
1088 vd = vp->v_data;
1089 pn = vd->mv_node;
1090 sx_xlock(&mqfs->mi_lock);
1091 vp->v_data = NULL;
1092 LIST_REMOVE(vd, mv_link);
1093 uma_zfree(mvdata_zone, vd);
1094 mqnode_release(pn);
1095 sx_xunlock(&mqfs->mi_lock);
1096 return (0);
1097 }
1098
1099 #if 0
1100 struct vop_open_args {
1101 struct vop_generic_args a_gen;
1102 struct vnode *a_vp;
1103 int a_mode;
1104 struct ucred *a_cred;
1105 struct thread *a_td;
1106 struct file *a_fp;
1107 };
1108 #endif
1109
1110 static int
1111 mqfs_open(struct vop_open_args *ap)
1112 {
1113 return (0);
1114 }
1115
1116 #if 0
1117 struct vop_close_args {
1118 struct vop_generic_args a_gen;
1119 struct vnode *a_vp;
1120 int a_fflag;
1121 struct ucred *a_cred;
1122 struct thread *a_td;
1123 };
1124 #endif
1125
1126 static int
1127 mqfs_close(struct vop_close_args *ap)
1128 {
1129 return (0);
1130 }
1131
1132 #if 0
1133 struct vop_access_args {
1134 struct vop_generic_args a_gen;
1135 struct vnode *a_vp;
1136 accmode_t a_accmode;
1137 struct ucred *a_cred;
1138 struct thread *a_td;
1139 };
1140 #endif
1141
1142 /*
1143 * Verify permissions
1144 */
1145 static int
1146 mqfs_access(struct vop_access_args *ap)
1147 {
1148 struct vnode *vp = ap->a_vp;
1149 struct vattr vattr;
1150 int error;
1151
1152 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1153 if (error)
1154 return (error);
1155 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1156 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1157 return (error);
1158 }
1159
1160 #if 0
1161 struct vop_getattr_args {
1162 struct vop_generic_args a_gen;
1163 struct vnode *a_vp;
1164 struct vattr *a_vap;
1165 struct ucred *a_cred;
1166 };
1167 #endif
1168
1169 /*
1170 * Get file attributes
1171 */
1172 static int
1173 mqfs_getattr(struct vop_getattr_args *ap)
1174 {
1175 struct vnode *vp = ap->a_vp;
1176 struct mqfs_node *pn = VTON(vp);
1177 struct vattr *vap = ap->a_vap;
1178 int error = 0;
1179
1180 vap->va_type = vp->v_type;
1181 vap->va_mode = pn->mn_mode;
1182 vap->va_nlink = 1;
1183 vap->va_uid = pn->mn_uid;
1184 vap->va_gid = pn->mn_gid;
1185 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1186 vap->va_fileid = pn->mn_fileno;
1187 vap->va_size = 0;
1188 vap->va_blocksize = PAGE_SIZE;
1189 vap->va_bytes = vap->va_size = 0;
1190 vap->va_atime = pn->mn_atime;
1191 vap->va_mtime = pn->mn_mtime;
1192 vap->va_ctime = pn->mn_ctime;
1193 vap->va_birthtime = pn->mn_birth;
1194 vap->va_gen = 0;
1195 vap->va_flags = 0;
1196 vap->va_rdev = NODEV;
1197 vap->va_bytes = 0;
1198 vap->va_filerev = 0;
1199 return (error);
1200 }
1201
1202 #if 0
1203 struct vop_setattr_args {
1204 struct vop_generic_args a_gen;
1205 struct vnode *a_vp;
1206 struct vattr *a_vap;
1207 struct ucred *a_cred;
1208 };
1209 #endif
1210 /*
1211 * Set attributes
1212 */
1213 static int
1214 mqfs_setattr(struct vop_setattr_args *ap)
1215 {
1216 struct mqfs_node *pn;
1217 struct vattr *vap;
1218 struct vnode *vp;
1219 struct thread *td;
1220 int c, error;
1221 uid_t uid;
1222 gid_t gid;
1223
1224 td = curthread;
1225 vap = ap->a_vap;
1226 vp = ap->a_vp;
1227 if ((vap->va_type != VNON) ||
1228 (vap->va_nlink != VNOVAL) ||
1229 (vap->va_fsid != VNOVAL) ||
1230 (vap->va_fileid != VNOVAL) ||
1231 (vap->va_blocksize != VNOVAL) ||
1232 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1233 (vap->va_rdev != VNOVAL) ||
1234 ((int)vap->va_bytes != VNOVAL) ||
1235 (vap->va_gen != VNOVAL)) {
1236 return (EINVAL);
1237 }
1238
1239 pn = VTON(vp);
1240
1241 error = c = 0;
1242 if (vap->va_uid == (uid_t)VNOVAL)
1243 uid = pn->mn_uid;
1244 else
1245 uid = vap->va_uid;
1246 if (vap->va_gid == (gid_t)VNOVAL)
1247 gid = pn->mn_gid;
1248 else
1249 gid = vap->va_gid;
1250
1251 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1252 /*
1253 * To modify the ownership of a file, must possess VADMIN
1254 * for that file.
1255 */
1256 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1257 return (error);
1258
1259 /*
1260 * XXXRW: Why is there a privilege check here: shouldn't the
1261 * check in VOP_ACCESS() be enough? Also, are the group bits
1262 * below definitely right?
1263 */
1264 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1265 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1266 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1267 return (error);
1268 pn->mn_uid = uid;
1269 pn->mn_gid = gid;
1270 c = 1;
1271 }
1272
1273 if (vap->va_mode != (mode_t)VNOVAL) {
1274 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1275 (error = priv_check(td, PRIV_MQ_ADMIN)))
1276 return (error);
1277 pn->mn_mode = vap->va_mode;
1278 c = 1;
1279 }
1280
1281 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1282 /* See the comment in ufs_vnops::ufs_setattr(). */
1283 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1284 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1285 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1286 return (error);
1287 if (vap->va_atime.tv_sec != VNOVAL) {
1288 pn->mn_atime = vap->va_atime;
1289 }
1290 if (vap->va_mtime.tv_sec != VNOVAL) {
1291 pn->mn_mtime = vap->va_mtime;
1292 }
1293 c = 1;
1294 }
1295 if (c) {
1296 vfs_timestamp(&pn->mn_ctime);
1297 }
1298 return (0);
1299 }
1300
1301 #if 0
1302 struct vop_read_args {
1303 struct vop_generic_args a_gen;
1304 struct vnode *a_vp;
1305 struct uio *a_uio;
1306 int a_ioflag;
1307 struct ucred *a_cred;
1308 };
1309 #endif
1310
1311 /*
1312 * Read from a file
1313 */
1314 static int
1315 mqfs_read(struct vop_read_args *ap)
1316 {
1317 char buf[80];
1318 struct vnode *vp = ap->a_vp;
1319 struct uio *uio = ap->a_uio;
1320 struct mqfs_node *pn;
1321 struct mqueue *mq;
1322 int len, error;
1323
1324 if (vp->v_type != VREG)
1325 return (EINVAL);
1326
1327 pn = VTON(vp);
1328 mq = VTOMQ(vp);
1329 snprintf(buf, sizeof(buf),
1330 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1331 mq->mq_totalbytes,
1332 mq->mq_maxmsg,
1333 mq->mq_curmsgs,
1334 mq->mq_msgsize);
1335 buf[sizeof(buf)-1] = '\0';
1336 len = strlen(buf);
1337 error = uiomove_frombuf(buf, len, uio);
1338 return (error);
1339 }
1340
1341 #if 0
1342 struct vop_readdir_args {
1343 struct vop_generic_args a_gen;
1344 struct vnode *a_vp;
1345 struct uio *a_uio;
1346 struct ucred *a_cred;
1347 int *a_eofflag;
1348 int *a_ncookies;
1349 u_long **a_cookies;
1350 };
1351 #endif
1352
1353 /*
1354 * Return directory entries.
1355 */
1356 static int
1357 mqfs_readdir(struct vop_readdir_args *ap)
1358 {
1359 struct vnode *vp;
1360 struct mqfs_info *mi;
1361 struct mqfs_node *pd;
1362 struct mqfs_node *pn;
1363 struct dirent entry;
1364 struct uio *uio;
1365 int *tmp_ncookies = NULL;
1366 off_t offset;
1367 int error, i;
1368
1369 vp = ap->a_vp;
1370 mi = VFSTOMQFS(vp->v_mount);
1371 pd = VTON(vp);
1372 uio = ap->a_uio;
1373
1374 if (vp->v_type != VDIR)
1375 return (ENOTDIR);
1376
1377 if (uio->uio_offset < 0)
1378 return (EINVAL);
1379
1380 if (ap->a_ncookies != NULL) {
1381 tmp_ncookies = ap->a_ncookies;
1382 *ap->a_ncookies = 0;
1383 ap->a_ncookies = NULL;
1384 }
1385
1386 error = 0;
1387 offset = 0;
1388
1389 sx_xlock(&mi->mi_lock);
1390
1391 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1392 entry.d_reclen = sizeof(entry);
1393 if (!pn->mn_fileno)
1394 mqfs_fileno_alloc(mi, pn);
1395 entry.d_fileno = pn->mn_fileno;
1396 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1397 entry.d_name[i] = pn->mn_name[i];
1398 entry.d_name[i] = 0;
1399 entry.d_namlen = i;
1400 switch (pn->mn_type) {
1401 case mqfstype_root:
1402 case mqfstype_dir:
1403 case mqfstype_this:
1404 case mqfstype_parent:
1405 entry.d_type = DT_DIR;
1406 break;
1407 case mqfstype_file:
1408 entry.d_type = DT_REG;
1409 break;
1410 case mqfstype_symlink:
1411 entry.d_type = DT_LNK;
1412 break;
1413 default:
1414 panic("%s has unexpected node type: %d", pn->mn_name,
1415 pn->mn_type);
1416 }
1417 if (entry.d_reclen > uio->uio_resid)
1418 break;
1419 if (offset >= uio->uio_offset) {
1420 error = vfs_read_dirent(ap, &entry, offset);
1421 if (error)
1422 break;
1423 }
1424 offset += entry.d_reclen;
1425 }
1426 sx_xunlock(&mi->mi_lock);
1427
1428 uio->uio_offset = offset;
1429
1430 if (tmp_ncookies != NULL)
1431 ap->a_ncookies = tmp_ncookies;
1432
1433 return (error);
1434 }
1435
1436 #ifdef notyet
1437
1438 #if 0
1439 struct vop_mkdir_args {
1440 struct vnode *a_dvp;
1441 struvt vnode **a_vpp;
1442 struvt componentname *a_cnp;
1443 struct vattr *a_vap;
1444 };
1445 #endif
1446
1447 /*
1448 * Create a directory.
1449 */
1450 static int
1451 mqfs_mkdir(struct vop_mkdir_args *ap)
1452 {
1453 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1454 struct componentname *cnp = ap->a_cnp;
1455 struct mqfs_node *pd = VTON(ap->a_dvp);
1456 struct mqfs_node *pn;
1457 int error;
1458
1459 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1460 return (ENOTDIR);
1461 sx_xlock(&mqfs->mi_lock);
1462 if ((cnp->cn_flags & HASBUF) == 0)
1463 panic("%s: no name", __func__);
1464 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1465 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1466 if (pn != NULL)
1467 mqnode_addref(pn);
1468 sx_xunlock(&mqfs->mi_lock);
1469 if (pn == NULL) {
1470 error = ENOSPC;
1471 } else {
1472 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1473 mqnode_release(pn);
1474 }
1475 return (error);
1476 }
1477
1478 #if 0
1479 struct vop_rmdir_args {
1480 struct vnode *a_dvp;
1481 struct vnode *a_vp;
1482 struct componentname *a_cnp;
1483 };
1484 #endif
1485
1486 /*
1487 * Remove a directory.
1488 */
1489 static int
1490 mqfs_rmdir(struct vop_rmdir_args *ap)
1491 {
1492 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1493 struct mqfs_node *pn = VTON(ap->a_vp);
1494 struct mqfs_node *pt;
1495
1496 if (pn->mn_type != mqfstype_dir)
1497 return (ENOTDIR);
1498
1499 sx_xlock(&mqfs->mi_lock);
1500 if (pn->mn_deleted) {
1501 sx_xunlock(&mqfs->mi_lock);
1502 return (ENOENT);
1503 }
1504
1505 pt = LIST_FIRST(&pn->mn_children);
1506 pt = LIST_NEXT(pt, mn_sibling);
1507 pt = LIST_NEXT(pt, mn_sibling);
1508 if (pt != NULL) {
1509 sx_xunlock(&mqfs->mi_lock);
1510 return (ENOTEMPTY);
1511 }
1512 pt = pn->mn_parent;
1513 pn->mn_parent = NULL;
1514 pn->mn_deleted = 1;
1515 LIST_REMOVE(pn, mn_sibling);
1516 mqnode_release(pn);
1517 mqnode_release(pt);
1518 sx_xunlock(&mqfs->mi_lock);
1519 cache_purge(ap->a_vp);
1520 return (0);
1521 }
1522
1523 #endif /* notyet */
1524
1525 /*
1526 * Allocate a message queue
1527 */
1528 static struct mqueue *
1529 mqueue_alloc(const struct mq_attr *attr)
1530 {
1531 struct mqueue *mq;
1532
1533 if (curmq >= maxmq)
1534 return (NULL);
1535 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1536 TAILQ_INIT(&mq->mq_msgq);
1537 if (attr != NULL) {
1538 mq->mq_maxmsg = attr->mq_maxmsg;
1539 mq->mq_msgsize = attr->mq_msgsize;
1540 } else {
1541 mq->mq_maxmsg = default_maxmsg;
1542 mq->mq_msgsize = default_msgsize;
1543 }
1544 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1545 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1546 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1547 atomic_add_int(&curmq, 1);
1548 return (mq);
1549 }
1550
1551 /*
1552 * Destroy a message queue
1553 */
1554 static void
1555 mqueue_free(struct mqueue *mq)
1556 {
1557 struct mqueue_msg *msg;
1558
1559 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1560 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1561 free(msg, M_MQUEUEDATA);
1562 }
1563
1564 mtx_destroy(&mq->mq_mutex);
1565 seldrain(&mq->mq_rsel);
1566 seldrain(&mq->mq_wsel);
1567 knlist_destroy(&mq->mq_rsel.si_note);
1568 knlist_destroy(&mq->mq_wsel.si_note);
1569 uma_zfree(mqueue_zone, mq);
1570 atomic_add_int(&curmq, -1);
1571 }
1572
1573 /*
1574 * Load a message from user space
1575 */
1576 static struct mqueue_msg *
1577 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1578 {
1579 struct mqueue_msg *msg;
1580 size_t len;
1581 int error;
1582
1583 len = sizeof(struct mqueue_msg) + msg_size;
1584 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1585 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1586 msg_size);
1587 if (error) {
1588 free(msg, M_MQUEUEDATA);
1589 msg = NULL;
1590 } else {
1591 msg->msg_size = msg_size;
1592 msg->msg_prio = msg_prio;
1593 }
1594 return (msg);
1595 }
1596
1597 /*
1598 * Save a message to user space
1599 */
1600 static int
1601 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1602 {
1603 int error;
1604
1605 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1606 msg->msg_size);
1607 if (error == 0 && msg_prio != NULL)
1608 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1609 return (error);
1610 }
1611
1612 /*
1613 * Free a message's memory
1614 */
1615 static __inline void
1616 mqueue_freemsg(struct mqueue_msg *msg)
1617 {
1618 free(msg, M_MQUEUEDATA);
1619 }
1620
1621 /*
1622 * Send a message. if waitok is false, thread will not be
1623 * blocked if there is no data in queue, otherwise, absolute
1624 * time will be checked.
1625 */
1626 int
1627 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1628 size_t msg_len, unsigned msg_prio, int waitok,
1629 const struct timespec *abs_timeout)
1630 {
1631 struct mqueue_msg *msg;
1632 struct timespec ts, ts2;
1633 struct timeval tv;
1634 int error;
1635
1636 if (msg_prio >= MQ_PRIO_MAX)
1637 return (EINVAL);
1638 if (msg_len > mq->mq_msgsize)
1639 return (EMSGSIZE);
1640 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1641 if (msg == NULL)
1642 return (EFAULT);
1643
1644 /* O_NONBLOCK case */
1645 if (!waitok) {
1646 error = _mqueue_send(mq, msg, -1);
1647 if (error)
1648 goto bad;
1649 return (0);
1650 }
1651
1652 /* we allow a null timeout (wait forever) */
1653 if (abs_timeout == NULL) {
1654 error = _mqueue_send(mq, msg, 0);
1655 if (error)
1656 goto bad;
1657 return (0);
1658 }
1659
1660 /* send it before checking time */
1661 error = _mqueue_send(mq, msg, -1);
1662 if (error == 0)
1663 return (0);
1664
1665 if (error != EAGAIN)
1666 goto bad;
1667
1668 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1669 error = EINVAL;
1670 goto bad;
1671 }
1672 for (;;) {
1673 ts2 = *abs_timeout;
1674 getnanotime(&ts);
1675 timespecsub(&ts2, &ts);
1676 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1677 error = ETIMEDOUT;
1678 break;
1679 }
1680 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1681 error = _mqueue_send(mq, msg, tvtohz(&tv));
1682 if (error != ETIMEDOUT)
1683 break;
1684 }
1685 if (error == 0)
1686 return (0);
1687 bad:
1688 mqueue_freemsg(msg);
1689 return (error);
1690 }
1691
1692 /*
1693 * Common routine to send a message
1694 */
1695 static int
1696 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1697 {
1698 struct mqueue_msg *msg2;
1699 int error = 0;
1700
1701 mtx_lock(&mq->mq_mutex);
1702 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1703 if (timo < 0) {
1704 mtx_unlock(&mq->mq_mutex);
1705 return (EAGAIN);
1706 }
1707 mq->mq_senders++;
1708 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1709 PCATCH, "mqsend", timo);
1710 mq->mq_senders--;
1711 if (error == EAGAIN)
1712 error = ETIMEDOUT;
1713 }
1714 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1715 mtx_unlock(&mq->mq_mutex);
1716 return (error);
1717 }
1718 error = 0;
1719 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1720 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1721 } else {
1722 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1723 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1724 } else {
1725 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1726 if (msg2->msg_prio < msg->msg_prio)
1727 break;
1728 }
1729 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1730 }
1731 }
1732 mq->mq_curmsgs++;
1733 mq->mq_totalbytes += msg->msg_size;
1734 if (mq->mq_receivers)
1735 wakeup_one(&mq->mq_receivers);
1736 else if (mq->mq_notifier != NULL)
1737 mqueue_send_notification(mq);
1738 if (mq->mq_flags & MQ_RSEL) {
1739 mq->mq_flags &= ~MQ_RSEL;
1740 selwakeup(&mq->mq_rsel);
1741 }
1742 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1743 mtx_unlock(&mq->mq_mutex);
1744 return (0);
1745 }
1746
1747 /*
1748 * Send realtime a signal to process which registered itself
1749 * successfully by mq_notify.
1750 */
1751 static void
1752 mqueue_send_notification(struct mqueue *mq)
1753 {
1754 struct mqueue_notifier *nt;
1755 struct thread *td;
1756 struct proc *p;
1757 int error;
1758
1759 mtx_assert(&mq->mq_mutex, MA_OWNED);
1760 nt = mq->mq_notifier;
1761 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1762 p = nt->nt_proc;
1763 error = sigev_findtd(p, &nt->nt_sigev, &td);
1764 if (error) {
1765 mq->mq_notifier = NULL;
1766 return;
1767 }
1768 if (!KSI_ONQ(&nt->nt_ksi)) {
1769 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1770 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1771 }
1772 PROC_UNLOCK(p);
1773 }
1774 mq->mq_notifier = NULL;
1775 }
1776
1777 /*
1778 * Get a message. if waitok is false, thread will not be
1779 * blocked if there is no data in queue, otherwise, absolute
1780 * time will be checked.
1781 */
1782 int
1783 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1784 size_t msg_len, unsigned *msg_prio, int waitok,
1785 const struct timespec *abs_timeout)
1786 {
1787 struct mqueue_msg *msg;
1788 struct timespec ts, ts2;
1789 struct timeval tv;
1790 int error;
1791
1792 if (msg_len < mq->mq_msgsize)
1793 return (EMSGSIZE);
1794
1795 /* O_NONBLOCK case */
1796 if (!waitok) {
1797 error = _mqueue_recv(mq, &msg, -1);
1798 if (error)
1799 return (error);
1800 goto received;
1801 }
1802
1803 /* we allow a null timeout (wait forever). */
1804 if (abs_timeout == NULL) {
1805 error = _mqueue_recv(mq, &msg, 0);
1806 if (error)
1807 return (error);
1808 goto received;
1809 }
1810
1811 /* try to get a message before checking time */
1812 error = _mqueue_recv(mq, &msg, -1);
1813 if (error == 0)
1814 goto received;
1815
1816 if (error != EAGAIN)
1817 return (error);
1818
1819 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1820 error = EINVAL;
1821 return (error);
1822 }
1823
1824 for (;;) {
1825 ts2 = *abs_timeout;
1826 getnanotime(&ts);
1827 timespecsub(&ts2, &ts);
1828 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1829 error = ETIMEDOUT;
1830 return (error);
1831 }
1832 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1833 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1834 if (error == 0)
1835 break;
1836 if (error != ETIMEDOUT)
1837 return (error);
1838 }
1839
1840 received:
1841 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1842 if (error == 0) {
1843 curthread->td_retval[0] = msg->msg_size;
1844 curthread->td_retval[1] = 0;
1845 }
1846 mqueue_freemsg(msg);
1847 return (error);
1848 }
1849
1850 /*
1851 * Common routine to receive a message
1852 */
1853 static int
1854 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1855 {
1856 int error = 0;
1857
1858 mtx_lock(&mq->mq_mutex);
1859 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1860 if (timo < 0) {
1861 mtx_unlock(&mq->mq_mutex);
1862 return (EAGAIN);
1863 }
1864 mq->mq_receivers++;
1865 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1866 PCATCH, "mqrecv", timo);
1867 mq->mq_receivers--;
1868 if (error == EAGAIN)
1869 error = ETIMEDOUT;
1870 }
1871 if (*msg != NULL) {
1872 error = 0;
1873 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1874 mq->mq_curmsgs--;
1875 mq->mq_totalbytes -= (*msg)->msg_size;
1876 if (mq->mq_senders)
1877 wakeup_one(&mq->mq_senders);
1878 if (mq->mq_flags & MQ_WSEL) {
1879 mq->mq_flags &= ~MQ_WSEL;
1880 selwakeup(&mq->mq_wsel);
1881 }
1882 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1883 }
1884 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1885 !TAILQ_EMPTY(&mq->mq_msgq)) {
1886 mqueue_send_notification(mq);
1887 }
1888 mtx_unlock(&mq->mq_mutex);
1889 return (error);
1890 }
1891
1892 static __inline struct mqueue_notifier *
1893 notifier_alloc(void)
1894 {
1895 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1896 }
1897
1898 static __inline void
1899 notifier_free(struct mqueue_notifier *p)
1900 {
1901 uma_zfree(mqnoti_zone, p);
1902 }
1903
1904 static struct mqueue_notifier *
1905 notifier_search(struct proc *p, int fd)
1906 {
1907 struct mqueue_notifier *nt;
1908
1909 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1910 if (nt->nt_ksi.ksi_mqd == fd)
1911 break;
1912 }
1913 return (nt);
1914 }
1915
1916 static __inline void
1917 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1918 {
1919 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1920 }
1921
1922 static __inline void
1923 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1924 {
1925 LIST_REMOVE(nt, nt_link);
1926 notifier_free(nt);
1927 }
1928
1929 static void
1930 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1931 {
1932 struct mqueue_notifier *nt;
1933
1934 mtx_assert(&mq->mq_mutex, MA_OWNED);
1935 PROC_LOCK(p);
1936 nt = notifier_search(p, fd);
1937 if (nt != NULL) {
1938 if (mq->mq_notifier == nt)
1939 mq->mq_notifier = NULL;
1940 sigqueue_take(&nt->nt_ksi);
1941 notifier_delete(p, nt);
1942 }
1943 PROC_UNLOCK(p);
1944 }
1945
1946 static int
1947 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
1948 const struct mq_attr *attr)
1949 {
1950 char path[MQFS_NAMELEN + 1];
1951 struct mqfs_node *pn;
1952 struct filedesc *fdp;
1953 struct file *fp;
1954 struct mqueue *mq;
1955 int fd, error, len, cmode;
1956
1957 fdp = td->td_proc->p_fd;
1958 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
1959 mq = NULL;
1960 if ((flags & O_CREAT) != 0 && attr != NULL) {
1961 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
1962 return (EINVAL);
1963 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
1964 return (EINVAL);
1965 }
1966
1967 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
1968 if (error)
1969 return (error);
1970
1971 /*
1972 * The first character of name must be a slash (/) character
1973 * and the remaining characters of name cannot include any slash
1974 * characters.
1975 */
1976 len = strlen(path);
1977 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
1978 return (EINVAL);
1979
1980 error = falloc(td, &fp, &fd, 0);
1981 if (error)
1982 return (error);
1983
1984 sx_xlock(&mqfs_data.mi_lock);
1985 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
1986 if (pn == NULL) {
1987 if (!(flags & O_CREAT)) {
1988 error = ENOENT;
1989 } else {
1990 mq = mqueue_alloc(attr);
1991 if (mq == NULL) {
1992 error = ENFILE;
1993 } else {
1994 pn = mqfs_create_file(mqfs_data.mi_root,
1995 path + 1, len - 1, td->td_ucred,
1996 cmode);
1997 if (pn == NULL) {
1998 error = ENOSPC;
1999 mqueue_free(mq);
2000 }
2001 }
2002 }
2003
2004 if (error == 0) {
2005 pn->mn_data = mq;
2006 }
2007 } else {
2008 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2009 error = EEXIST;
2010 } else {
2011 accmode_t accmode = 0;
2012
2013 if (flags & FREAD)
2014 accmode |= VREAD;
2015 if (flags & FWRITE)
2016 accmode |= VWRITE;
2017 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2018 pn->mn_gid, accmode, td->td_ucred, NULL);
2019 }
2020 }
2021
2022 if (error) {
2023 sx_xunlock(&mqfs_data.mi_lock);
2024 fdclose(fdp, fp, fd, td);
2025 fdrop(fp, td);
2026 return (error);
2027 }
2028
2029 mqnode_addref(pn);
2030 sx_xunlock(&mqfs_data.mi_lock);
2031
2032 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2033 &mqueueops);
2034
2035 FILEDESC_XLOCK(fdp);
2036 if (fdp->fd_ofiles[fd] == fp)
2037 fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
2038 FILEDESC_XUNLOCK(fdp);
2039 td->td_retval[0] = fd;
2040 fdrop(fp, td);
2041 return (0);
2042 }
2043
2044 /*
2045 * Syscall to open a message queue.
2046 */
2047 int
2048 sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
2049 {
2050 struct mq_attr attr;
2051 int flags, error;
2052
2053 if ((uap->flags & O_ACCMODE) == O_ACCMODE)
2054 return (EINVAL);
2055 flags = FFLAGS(uap->flags);
2056 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2057 error = copyin(uap->attr, &attr, sizeof(attr));
2058 if (error)
2059 return (error);
2060 }
2061 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2062 uap->attr != NULL ? &attr : NULL));
2063 }
2064
2065 /*
2066 * Syscall to unlink a message queue.
2067 */
2068 int
2069 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2070 {
2071 char path[MQFS_NAMELEN+1];
2072 struct mqfs_node *pn;
2073 int error, len;
2074
2075 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2076 if (error)
2077 return (error);
2078
2079 len = strlen(path);
2080 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
2081 return (EINVAL);
2082
2083 sx_xlock(&mqfs_data.mi_lock);
2084 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
2085 if (pn != NULL)
2086 error = do_unlink(pn, td->td_ucred);
2087 else
2088 error = ENOENT;
2089 sx_xunlock(&mqfs_data.mi_lock);
2090 return (error);
2091 }
2092
2093 typedef int (*_fgetf)(struct thread *, int, cap_rights_t, struct file **);
2094
2095 /*
2096 * Get message queue by giving file slot
2097 */
2098 static int
2099 _getmq(struct thread *td, int fd, cap_rights_t rights, _fgetf func,
2100 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2101 {
2102 struct mqfs_node *pn;
2103 int error;
2104
2105 error = func(td, fd, rights, fpp);
2106 if (error)
2107 return (error);
2108 if (&mqueueops != (*fpp)->f_ops) {
2109 fdrop(*fpp, td);
2110 return (EBADF);
2111 }
2112 pn = (*fpp)->f_data;
2113 if (ppn)
2114 *ppn = pn;
2115 if (pmq)
2116 *pmq = pn->mn_data;
2117 return (0);
2118 }
2119
2120 static __inline int
2121 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2122 struct mqueue **pmq)
2123 {
2124 return _getmq(td, fd, CAP_POLL_EVENT, fget, fpp, ppn, pmq);
2125 }
2126
2127 static __inline int
2128 getmq_read(struct thread *td, int fd, struct file **fpp,
2129 struct mqfs_node **ppn, struct mqueue **pmq)
2130 {
2131 return _getmq(td, fd, CAP_READ, fget_read, fpp, ppn, pmq);
2132 }
2133
2134 static __inline int
2135 getmq_write(struct thread *td, int fd, struct file **fpp,
2136 struct mqfs_node **ppn, struct mqueue **pmq)
2137 {
2138 return _getmq(td, fd, CAP_WRITE, fget_write, fpp, ppn, pmq);
2139 }
2140
2141 static int
2142 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2143 struct mq_attr *oattr)
2144 {
2145 struct mqueue *mq;
2146 struct file *fp;
2147 u_int oflag, flag;
2148 int error;
2149
2150 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2151 return (EINVAL);
2152 error = getmq(td, mqd, &fp, NULL, &mq);
2153 if (error)
2154 return (error);
2155 oattr->mq_maxmsg = mq->mq_maxmsg;
2156 oattr->mq_msgsize = mq->mq_msgsize;
2157 oattr->mq_curmsgs = mq->mq_curmsgs;
2158 if (attr != NULL) {
2159 do {
2160 oflag = flag = fp->f_flag;
2161 flag &= ~O_NONBLOCK;
2162 flag |= (attr->mq_flags & O_NONBLOCK);
2163 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2164 } else
2165 oflag = fp->f_flag;
2166 oattr->mq_flags = (O_NONBLOCK & oflag);
2167 fdrop(fp, td);
2168 return (error);
2169 }
2170
2171 int
2172 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2173 {
2174 struct mq_attr attr, oattr;
2175 int error;
2176
2177 if (uap->attr != NULL) {
2178 error = copyin(uap->attr, &attr, sizeof(attr));
2179 if (error != 0)
2180 return (error);
2181 }
2182 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2183 &oattr);
2184 if (error != 0)
2185 return (error);
2186 if (uap->oattr != NULL)
2187 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2188 return (error);
2189 }
2190
2191 int
2192 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2193 {
2194 struct mqueue *mq;
2195 struct file *fp;
2196 struct timespec *abs_timeout, ets;
2197 int error;
2198 int waitok;
2199
2200 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2201 if (error)
2202 return (error);
2203 if (uap->abs_timeout != NULL) {
2204 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2205 if (error != 0)
2206 return (error);
2207 abs_timeout = &ets;
2208 } else
2209 abs_timeout = NULL;
2210 waitok = !(fp->f_flag & O_NONBLOCK);
2211 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2212 uap->msg_prio, waitok, abs_timeout);
2213 fdrop(fp, td);
2214 return (error);
2215 }
2216
2217 int
2218 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2219 {
2220 struct mqueue *mq;
2221 struct file *fp;
2222 struct timespec *abs_timeout, ets;
2223 int error, waitok;
2224
2225 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2226 if (error)
2227 return (error);
2228 if (uap->abs_timeout != NULL) {
2229 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2230 if (error != 0)
2231 return (error);
2232 abs_timeout = &ets;
2233 } else
2234 abs_timeout = NULL;
2235 waitok = !(fp->f_flag & O_NONBLOCK);
2236 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2237 uap->msg_prio, waitok, abs_timeout);
2238 fdrop(fp, td);
2239 return (error);
2240 }
2241
2242 int
2243 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2244 {
2245 struct sigevent ev;
2246 struct filedesc *fdp;
2247 struct proc *p;
2248 struct mqueue *mq;
2249 struct file *fp, *fp2;
2250 struct mqueue_notifier *nt, *newnt = NULL;
2251 int error;
2252
2253 p = td->td_proc;
2254 fdp = td->td_proc->p_fd;
2255 if (uap->sigev) {
2256 error = copyin(uap->sigev, &ev, sizeof(ev));
2257 if (error)
2258 return (error);
2259 if (ev.sigev_notify != SIGEV_SIGNAL &&
2260 ev.sigev_notify != SIGEV_THREAD_ID &&
2261 ev.sigev_notify != SIGEV_NONE)
2262 return (EINVAL);
2263 if ((ev.sigev_notify == SIGEV_SIGNAL ||
2264 ev.sigev_notify == SIGEV_THREAD_ID) &&
2265 !_SIG_VALID(ev.sigev_signo))
2266 return (EINVAL);
2267 }
2268 error = getmq(td, uap->mqd, &fp, NULL, &mq);
2269 if (error)
2270 return (error);
2271 again:
2272 FILEDESC_SLOCK(fdp);
2273 fp2 = fget_locked(fdp, uap->mqd);
2274 if (fp2 == NULL) {
2275 FILEDESC_SUNLOCK(fdp);
2276 error = EBADF;
2277 goto out;
2278 }
2279 error = cap_funwrap(fp2, CAP_POLL_EVENT, &fp2);
2280 if (error) {
2281 FILEDESC_SUNLOCK(fdp);
2282 goto out;
2283 }
2284 if (fp2 != fp) {
2285 FILEDESC_SUNLOCK(fdp);
2286 error = EBADF;
2287 goto out;
2288 }
2289 mtx_lock(&mq->mq_mutex);
2290 FILEDESC_SUNLOCK(fdp);
2291 if (uap->sigev != NULL) {
2292 if (mq->mq_notifier != NULL) {
2293 error = EBUSY;
2294 } else {
2295 PROC_LOCK(p);
2296 nt = notifier_search(p, uap->mqd);
2297 if (nt == NULL) {
2298 if (newnt == NULL) {
2299 PROC_UNLOCK(p);
2300 mtx_unlock(&mq->mq_mutex);
2301 newnt = notifier_alloc();
2302 goto again;
2303 }
2304 }
2305
2306 if (nt != NULL) {
2307 sigqueue_take(&nt->nt_ksi);
2308 if (newnt != NULL) {
2309 notifier_free(newnt);
2310 newnt = NULL;
2311 }
2312 } else {
2313 nt = newnt;
2314 newnt = NULL;
2315 ksiginfo_init(&nt->nt_ksi);
2316 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2317 nt->nt_ksi.ksi_code = SI_MESGQ;
2318 nt->nt_proc = p;
2319 nt->nt_ksi.ksi_mqd = uap->mqd;
2320 notifier_insert(p, nt);
2321 }
2322 nt->nt_sigev = ev;
2323 mq->mq_notifier = nt;
2324 PROC_UNLOCK(p);
2325 /*
2326 * if there is no receivers and message queue
2327 * is not empty, we should send notification
2328 * as soon as possible.
2329 */
2330 if (mq->mq_receivers == 0 &&
2331 !TAILQ_EMPTY(&mq->mq_msgq))
2332 mqueue_send_notification(mq);
2333 }
2334 } else {
2335 notifier_remove(p, mq, uap->mqd);
2336 }
2337 mtx_unlock(&mq->mq_mutex);
2338
2339 out:
2340 fdrop(fp, td);
2341 if (newnt != NULL)
2342 notifier_free(newnt);
2343 return (error);
2344 }
2345
2346 static void
2347 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2348 {
2349 struct filedesc *fdp;
2350 struct mqueue *mq;
2351
2352 fdp = td->td_proc->p_fd;
2353 FILEDESC_LOCK_ASSERT(fdp);
2354
2355 if (fp->f_ops == &mqueueops) {
2356 mq = FPTOMQ(fp);
2357 mtx_lock(&mq->mq_mutex);
2358 notifier_remove(td->td_proc, mq, fd);
2359
2360 /* have to wakeup thread in same process */
2361 if (mq->mq_flags & MQ_RSEL) {
2362 mq->mq_flags &= ~MQ_RSEL;
2363 selwakeup(&mq->mq_rsel);
2364 }
2365 if (mq->mq_flags & MQ_WSEL) {
2366 mq->mq_flags &= ~MQ_WSEL;
2367 selwakeup(&mq->mq_wsel);
2368 }
2369 mtx_unlock(&mq->mq_mutex);
2370 }
2371 }
2372
2373 static void
2374 mq_proc_exit(void *arg __unused, struct proc *p)
2375 {
2376 struct filedesc *fdp;
2377 struct file *fp;
2378 struct mqueue *mq;
2379 int i;
2380
2381 fdp = p->p_fd;
2382 FILEDESC_SLOCK(fdp);
2383 for (i = 0; i < fdp->fd_nfiles; ++i) {
2384 fp = fget_locked(fdp, i);
2385 if (fp != NULL && fp->f_ops == &mqueueops) {
2386 mq = FPTOMQ(fp);
2387 mtx_lock(&mq->mq_mutex);
2388 notifier_remove(p, FPTOMQ(fp), i);
2389 mtx_unlock(&mq->mq_mutex);
2390 }
2391 }
2392 FILEDESC_SUNLOCK(fdp);
2393 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2394 }
2395
2396 static int
2397 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
2398 int flags, struct thread *td)
2399 {
2400 return (EOPNOTSUPP);
2401 }
2402
2403 static int
2404 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
2405 int flags, struct thread *td)
2406 {
2407 return (EOPNOTSUPP);
2408 }
2409
2410 static int
2411 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred,
2412 struct thread *td)
2413 {
2414
2415 return (EINVAL);
2416 }
2417
2418 static int
2419 mqf_ioctl(struct file *fp, u_long cmd, void *data,
2420 struct ucred *active_cred, struct thread *td)
2421 {
2422 return (ENOTTY);
2423 }
2424
2425 static int
2426 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2427 struct thread *td)
2428 {
2429 struct mqueue *mq = FPTOMQ(fp);
2430 int revents = 0;
2431
2432 mtx_lock(&mq->mq_mutex);
2433 if (events & (POLLIN | POLLRDNORM)) {
2434 if (mq->mq_curmsgs) {
2435 revents |= events & (POLLIN | POLLRDNORM);
2436 } else {
2437 mq->mq_flags |= MQ_RSEL;
2438 selrecord(td, &mq->mq_rsel);
2439 }
2440 }
2441 if (events & POLLOUT) {
2442 if (mq->mq_curmsgs < mq->mq_maxmsg)
2443 revents |= POLLOUT;
2444 else {
2445 mq->mq_flags |= MQ_WSEL;
2446 selrecord(td, &mq->mq_wsel);
2447 }
2448 }
2449 mtx_unlock(&mq->mq_mutex);
2450 return (revents);
2451 }
2452
2453 static int
2454 mqf_close(struct file *fp, struct thread *td)
2455 {
2456 struct mqfs_node *pn;
2457
2458 fp->f_ops = &badfileops;
2459 pn = fp->f_data;
2460 fp->f_data = NULL;
2461 sx_xlock(&mqfs_data.mi_lock);
2462 mqnode_release(pn);
2463 sx_xunlock(&mqfs_data.mi_lock);
2464 return (0);
2465 }
2466
2467 static int
2468 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2469 struct thread *td)
2470 {
2471 struct mqfs_node *pn = fp->f_data;
2472
2473 bzero(st, sizeof *st);
2474 sx_xlock(&mqfs_data.mi_lock);
2475 st->st_atim = pn->mn_atime;
2476 st->st_mtim = pn->mn_mtime;
2477 st->st_ctim = pn->mn_ctime;
2478 st->st_birthtim = pn->mn_birth;
2479 st->st_uid = pn->mn_uid;
2480 st->st_gid = pn->mn_gid;
2481 st->st_mode = S_IFIFO | pn->mn_mode;
2482 sx_xunlock(&mqfs_data.mi_lock);
2483 return (0);
2484 }
2485
2486 static int
2487 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2488 struct thread *td)
2489 {
2490 struct mqfs_node *pn;
2491 int error;
2492
2493 error = 0;
2494 pn = fp->f_data;
2495 sx_xlock(&mqfs_data.mi_lock);
2496 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
2497 active_cred, NULL);
2498 if (error != 0)
2499 goto out;
2500 pn->mn_mode = mode & ACCESSPERMS;
2501 out:
2502 sx_xunlock(&mqfs_data.mi_lock);
2503 return (error);
2504 }
2505
2506 static int
2507 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2508 struct thread *td)
2509 {
2510 struct mqfs_node *pn;
2511 int error;
2512
2513 error = 0;
2514 pn = fp->f_data;
2515 sx_xlock(&mqfs_data.mi_lock);
2516 if (uid == (uid_t)-1)
2517 uid = pn->mn_uid;
2518 if (gid == (gid_t)-1)
2519 gid = pn->mn_gid;
2520 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
2521 (gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
2522 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
2523 goto out;
2524 pn->mn_uid = uid;
2525 pn->mn_gid = gid;
2526 out:
2527 sx_xunlock(&mqfs_data.mi_lock);
2528 return (error);
2529 }
2530
2531 static int
2532 mqf_kqfilter(struct file *fp, struct knote *kn)
2533 {
2534 struct mqueue *mq = FPTOMQ(fp);
2535 int error = 0;
2536
2537 if (kn->kn_filter == EVFILT_READ) {
2538 kn->kn_fop = &mq_rfiltops;
2539 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2540 } else if (kn->kn_filter == EVFILT_WRITE) {
2541 kn->kn_fop = &mq_wfiltops;
2542 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2543 } else
2544 error = EINVAL;
2545 return (error);
2546 }
2547
2548 static void
2549 filt_mqdetach(struct knote *kn)
2550 {
2551 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2552
2553 if (kn->kn_filter == EVFILT_READ)
2554 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2555 else if (kn->kn_filter == EVFILT_WRITE)
2556 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2557 else
2558 panic("filt_mqdetach");
2559 }
2560
2561 static int
2562 filt_mqread(struct knote *kn, long hint)
2563 {
2564 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2565
2566 mtx_assert(&mq->mq_mutex, MA_OWNED);
2567 return (mq->mq_curmsgs != 0);
2568 }
2569
2570 static int
2571 filt_mqwrite(struct knote *kn, long hint)
2572 {
2573 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2574
2575 mtx_assert(&mq->mq_mutex, MA_OWNED);
2576 return (mq->mq_curmsgs < mq->mq_maxmsg);
2577 }
2578
2579 static struct fileops mqueueops = {
2580 .fo_read = mqf_read,
2581 .fo_write = mqf_write,
2582 .fo_truncate = mqf_truncate,
2583 .fo_ioctl = mqf_ioctl,
2584 .fo_poll = mqf_poll,
2585 .fo_kqfilter = mqf_kqfilter,
2586 .fo_stat = mqf_stat,
2587 .fo_chmod = mqf_chmod,
2588 .fo_chown = mqf_chown,
2589 .fo_close = mqf_close
2590 };
2591
2592 static struct vop_vector mqfs_vnodeops = {
2593 .vop_default = &default_vnodeops,
2594 .vop_access = mqfs_access,
2595 .vop_cachedlookup = mqfs_lookup,
2596 .vop_lookup = vfs_cache_lookup,
2597 .vop_reclaim = mqfs_reclaim,
2598 .vop_create = mqfs_create,
2599 .vop_remove = mqfs_remove,
2600 .vop_inactive = mqfs_inactive,
2601 .vop_open = mqfs_open,
2602 .vop_close = mqfs_close,
2603 .vop_getattr = mqfs_getattr,
2604 .vop_setattr = mqfs_setattr,
2605 .vop_read = mqfs_read,
2606 .vop_write = VOP_EOPNOTSUPP,
2607 .vop_readdir = mqfs_readdir,
2608 .vop_mkdir = VOP_EOPNOTSUPP,
2609 .vop_rmdir = VOP_EOPNOTSUPP
2610 };
2611
2612 static struct vfsops mqfs_vfsops = {
2613 .vfs_init = mqfs_init,
2614 .vfs_uninit = mqfs_uninit,
2615 .vfs_mount = mqfs_mount,
2616 .vfs_unmount = mqfs_unmount,
2617 .vfs_root = mqfs_root,
2618 .vfs_statfs = mqfs_statfs,
2619 };
2620
2621 static struct vfsconf mqueuefs_vfsconf = {
2622 .vfc_version = VFS_VERSION,
2623 .vfc_name = "mqueuefs",
2624 .vfc_vfsops = &mqfs_vfsops,
2625 .vfc_typenum = -1,
2626 .vfc_flags = VFCF_SYNTHETIC
2627 };
2628
2629 static struct syscall_helper_data mq_syscalls[] = {
2630 SYSCALL_INIT_HELPER(kmq_open),
2631 SYSCALL_INIT_HELPER(kmq_setattr),
2632 SYSCALL_INIT_HELPER(kmq_timedsend),
2633 SYSCALL_INIT_HELPER(kmq_timedreceive),
2634 SYSCALL_INIT_HELPER(kmq_notify),
2635 SYSCALL_INIT_HELPER(kmq_unlink),
2636 SYSCALL_INIT_LAST
2637 };
2638
2639 #ifdef COMPAT_FREEBSD32
2640 #include <compat/freebsd32/freebsd32.h>
2641 #include <compat/freebsd32/freebsd32_proto.h>
2642 #include <compat/freebsd32/freebsd32_syscall.h>
2643 #include <compat/freebsd32/freebsd32_util.h>
2644
2645 static void
2646 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2647 {
2648
2649 to->mq_flags = from->mq_flags;
2650 to->mq_maxmsg = from->mq_maxmsg;
2651 to->mq_msgsize = from->mq_msgsize;
2652 to->mq_curmsgs = from->mq_curmsgs;
2653 }
2654
2655 static void
2656 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2657 {
2658
2659 to->mq_flags = from->mq_flags;
2660 to->mq_maxmsg = from->mq_maxmsg;
2661 to->mq_msgsize = from->mq_msgsize;
2662 to->mq_curmsgs = from->mq_curmsgs;
2663 }
2664
2665 int
2666 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
2667 {
2668 struct mq_attr attr;
2669 struct mq_attr32 attr32;
2670 int flags, error;
2671
2672 if ((uap->flags & O_ACCMODE) == O_ACCMODE)
2673 return (EINVAL);
2674 flags = FFLAGS(uap->flags);
2675 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2676 error = copyin(uap->attr, &attr32, sizeof(attr32));
2677 if (error)
2678 return (error);
2679 mq_attr_from32(&attr32, &attr);
2680 }
2681 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2682 uap->attr != NULL ? &attr : NULL));
2683 }
2684
2685 int
2686 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
2687 {
2688 struct mq_attr attr, oattr;
2689 struct mq_attr32 attr32, oattr32;
2690 int error;
2691
2692 if (uap->attr != NULL) {
2693 error = copyin(uap->attr, &attr32, sizeof(attr32));
2694 if (error != 0)
2695 return (error);
2696 mq_attr_from32(&attr32, &attr);
2697 }
2698 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2699 &oattr);
2700 if (error != 0)
2701 return (error);
2702 if (uap->oattr != NULL) {
2703 mq_attr_to32(&oattr, &oattr32);
2704 error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2705 }
2706 return (error);
2707 }
2708
2709 int
2710 freebsd32_kmq_timedsend(struct thread *td,
2711 struct freebsd32_kmq_timedsend_args *uap)
2712 {
2713 struct mqueue *mq;
2714 struct file *fp;
2715 struct timespec32 ets32;
2716 struct timespec *abs_timeout, ets;
2717 int error;
2718 int waitok;
2719
2720 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2721 if (error)
2722 return (error);
2723 if (uap->abs_timeout != NULL) {
2724 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2725 if (error != 0)
2726 return (error);
2727 CP(ets32, ets, tv_sec);
2728 CP(ets32, ets, tv_nsec);
2729 abs_timeout = &ets;
2730 } else
2731 abs_timeout = NULL;
2732 waitok = !(fp->f_flag & O_NONBLOCK);
2733 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2734 uap->msg_prio, waitok, abs_timeout);
2735 fdrop(fp, td);
2736 return (error);
2737 }
2738
2739 int
2740 freebsd32_kmq_timedreceive(struct thread *td,
2741 struct freebsd32_kmq_timedreceive_args *uap)
2742 {
2743 struct mqueue *mq;
2744 struct file *fp;
2745 struct timespec32 ets32;
2746 struct timespec *abs_timeout, ets;
2747 int error, waitok;
2748
2749 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2750 if (error)
2751 return (error);
2752 if (uap->abs_timeout != NULL) {
2753 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2754 if (error != 0)
2755 return (error);
2756 CP(ets32, ets, tv_sec);
2757 CP(ets32, ets, tv_nsec);
2758 abs_timeout = &ets;
2759 } else
2760 abs_timeout = NULL;
2761 waitok = !(fp->f_flag & O_NONBLOCK);
2762 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2763 uap->msg_prio, waitok, abs_timeout);
2764 fdrop(fp, td);
2765 return (error);
2766 }
2767
2768 static struct syscall_helper_data mq32_syscalls[] = {
2769 SYSCALL32_INIT_HELPER(freebsd32_kmq_open),
2770 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr),
2771 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend),
2772 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive),
2773 SYSCALL32_INIT_HELPER_COMPAT(kmq_notify),
2774 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink),
2775 SYSCALL_INIT_LAST
2776 };
2777 #endif
2778
2779 static int
2780 mqinit(void)
2781 {
2782 int error;
2783
2784 error = syscall_helper_register(mq_syscalls);
2785 if (error != 0)
2786 return (error);
2787 #ifdef COMPAT_FREEBSD32
2788 error = syscall32_helper_register(mq32_syscalls);
2789 if (error != 0)
2790 return (error);
2791 #endif
2792 return (0);
2793 }
2794
2795 static int
2796 mqunload(void)
2797 {
2798
2799 #ifdef COMPAT_FREEBSD32
2800 syscall32_helper_unregister(mq32_syscalls);
2801 #endif
2802 syscall_helper_unregister(mq_syscalls);
2803 return (0);
2804 }
2805
2806 static int
2807 mq_modload(struct module *module, int cmd, void *arg)
2808 {
2809 int error = 0;
2810
2811 error = vfs_modevent(module, cmd, arg);
2812 if (error != 0)
2813 return (error);
2814
2815 switch (cmd) {
2816 case MOD_LOAD:
2817 error = mqinit();
2818 if (error != 0)
2819 mqunload();
2820 break;
2821 case MOD_UNLOAD:
2822 error = mqunload();
2823 break;
2824 default:
2825 break;
2826 }
2827 return (error);
2828 }
2829
2830 static moduledata_t mqueuefs_mod = {
2831 "mqueuefs",
2832 mq_modload,
2833 &mqueuefs_vfsconf
2834 };
2835 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
2836 MODULE_VERSION(mqueuefs, 1);
Cache object: cc508d1dc0dc72b91abc41977719339b
|