2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
3 * Copyright (c) 2016-2017 Robert N. M. Watson
6 * Portions of this software were developed by BAE Systems, the University of
7 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
8 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
9 * Computing (TC) research program.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * POSIX message queue implementation.
37 * 1) A mqueue filesystem can be mounted, each message queue appears
38 * in mounted directory, user can change queue's permission and
39 * ownership, or remove a queue. Manually creating a file in the
40 * directory causes a message queue to be created in the kernel with
41 * default message queue attributes applied and same name used, this
42 * method is not advocated since mq_open syscall allows user to specify
43 * different attributes. Also the file system can be mounted multiple
44 * times at different mount points but shows same contents.
46 * 2) Standard POSIX message queue API. The syscalls do not use vfs layer,
47 * but directly operate on internal data structure, this allows user to
48 * use the IPC facility without having to mount mqueue file system.
51 #include <sys/cdefs.h>
52 __FBSDID("$FreeBSD$");
54 #include "opt_capsicum.h"
55 #include "opt_compat.h"
57 #include <sys/param.h>
58 #include <sys/kernel.h>
59 #include <sys/systm.h>
60 #include <sys/limits.h>
61 #include <sys/malloc.h>
63 #include <sys/capsicum.h>
64 #include <sys/dirent.h>
65 #include <sys/event.h>
66 #include <sys/eventhandler.h>
67 #include <sys/fcntl.h>
69 #include <sys/filedesc.h>
72 #include <sys/module.h>
73 #include <sys/mount.h>
74 #include <sys/mqueue.h>
75 #include <sys/mutex.h>
76 #include <sys/namei.h>
77 #include <sys/posix4.h>
81 #include <sys/queue.h>
82 #include <sys/sysproto.h>
84 #include <sys/syscall.h>
85 #include <sys/syscallsubr.h>
86 #include <sys/sysent.h>
88 #include <sys/sysctl.h>
89 #include <sys/taskqueue.h>
90 #include <sys/unistd.h>
92 #include <sys/vnode.h>
93 #include <machine/atomic.h>
95 #include <security/audit/audit.h>
97 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
100 * Limits and constants
102 #define MQFS_NAMELEN NAME_MAX
103 #define MQFS_DELEN (8 + MQFS_NAMELEN)
119 * mqfs_info: describes a mqfs instance
123 struct mqfs_node *mi_root;
124 struct unrhdr *mi_unrhdr;
128 LIST_ENTRY(mqfs_vdata) mv_link;
129 struct mqfs_node *mv_node;
130 struct vnode *mv_vnode;
135 * mqfs_node: describes a node (file or directory) within a mqfs
138 char mn_name[MQFS_NAMELEN+1];
139 struct mqfs_info *mn_info;
140 struct mqfs_node *mn_parent;
141 LIST_HEAD(,mqfs_node) mn_children;
142 LIST_ENTRY(mqfs_node) mn_sibling;
143 LIST_HEAD(,mqfs_vdata) mn_vnodes;
144 const void *mn_pr_root;
150 struct timespec mn_birth;
151 struct timespec mn_ctime;
152 struct timespec mn_atime;
153 struct timespec mn_mtime;
159 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
160 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
161 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
162 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
163 (fp)->f_data)->mn_data))
165 TAILQ_HEAD(msgq, mqueue_msg);
169 struct mqueue_notifier {
170 LIST_ENTRY(mqueue_notifier) nt_link;
171 struct sigevent nt_sigev;
173 struct proc *nt_proc;
186 struct selinfo mq_rsel;
187 struct selinfo mq_wsel;
188 struct mqueue_notifier *mq_notifier;
195 TAILQ_ENTRY(mqueue_msg) msg_link;
196 unsigned int msg_prio;
197 unsigned int msg_size;
198 /* following real data... */
201 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
202 "POSIX real time message queue");
204 static int default_maxmsg = 10;
205 static int default_msgsize = 1024;
207 static int maxmsg = 100;
208 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
209 &maxmsg, 0, "Default maximum messages in queue");
210 static int maxmsgsize = 16384;
211 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
212 &maxmsgsize, 0, "Default maximum message size");
213 static int maxmq = 100;
214 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
215 &maxmq, 0, "maximum message queues");
216 static int curmq = 0;
217 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
218 &curmq, 0, "current message queue number");
219 static int unloadable = 0;
220 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
222 static eventhandler_tag exit_tag;
224 /* Only one instance per-system */
225 static struct mqfs_info mqfs_data;
226 static uma_zone_t mqnode_zone;
227 static uma_zone_t mqueue_zone;
228 static uma_zone_t mvdata_zone;
229 static uma_zone_t mqnoti_zone;
230 static struct vop_vector mqfs_vnodeops;
231 static struct fileops mqueueops;
232 static unsigned mqfs_osd_jail_slot;
235 * Directory structure construction and manipulation
238 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
239 const char *name, int namelen, struct ucred *cred, int mode);
240 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
241 const char *name, int namelen, struct ucred *cred, int mode);
244 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
245 const char *name, int namelen, struct ucred *cred, int mode);
246 static int mqfs_destroy(struct mqfs_node *mn);
247 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
248 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
249 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
250 static int mqfs_prison_remove(void *obj, void *data);
253 * Message queue construction and maniplation
255 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
256 static void mqueue_free(struct mqueue *mq);
257 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
258 size_t msg_len, unsigned msg_prio, int waitok,
259 const struct timespec *abs_timeout);
260 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
261 size_t msg_len, unsigned *msg_prio, int waitok,
262 const struct timespec *abs_timeout);
263 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
265 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
267 static void mqueue_send_notification(struct mqueue *mq);
268 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
269 static void mq_proc_exit(void *arg, struct proc *p);
274 static void filt_mqdetach(struct knote *kn);
275 static int filt_mqread(struct knote *kn, long hint);
276 static int filt_mqwrite(struct knote *kn, long hint);
278 struct filterops mq_rfiltops = {
280 .f_detach = filt_mqdetach,
281 .f_event = filt_mqread,
283 struct filterops mq_wfiltops = {
285 .f_detach = filt_mqdetach,
286 .f_event = filt_mqwrite,
290 * Initialize fileno bitmap
293 mqfs_fileno_init(struct mqfs_info *mi)
297 up = new_unrhdr(1, INT_MAX, NULL);
302 * Tear down fileno bitmap
305 mqfs_fileno_uninit(struct mqfs_info *mi)
310 mi->mi_unrhdr = NULL;
315 * Allocate a file number
318 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
320 /* make sure our parent has a file number */
321 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
322 mqfs_fileno_alloc(mi, mn->mn_parent);
324 switch (mn->mn_type) {
328 case mqfstype_symlink:
329 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
332 KASSERT(mn->mn_parent != NULL,
333 ("mqfstype_this node has no parent"));
334 mn->mn_fileno = mn->mn_parent->mn_fileno;
336 case mqfstype_parent:
337 KASSERT(mn->mn_parent != NULL,
338 ("mqfstype_parent node has no parent"));
339 if (mn->mn_parent == mi->mi_root) {
340 mn->mn_fileno = mn->mn_parent->mn_fileno;
343 KASSERT(mn->mn_parent->mn_parent != NULL,
344 ("mqfstype_parent node has no grandparent"));
345 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
349 ("mqfs_fileno_alloc() called for unknown type node: %d",
356 * Release a file number
359 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
361 switch (mn->mn_type) {
365 case mqfstype_symlink:
366 free_unr(mi->mi_unrhdr, mn->mn_fileno);
369 case mqfstype_parent:
370 /* ignore these, as they don't "own" their file number */
374 ("mqfs_fileno_free() called for unknown type node: %d",
380 static __inline struct mqfs_node *
383 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
387 mqnode_free(struct mqfs_node *node)
389 uma_zfree(mqnode_zone, node);
393 mqnode_addref(struct mqfs_node *node)
395 atomic_fetchadd_int(&node->mn_refcount, 1);
399 mqnode_release(struct mqfs_node *node)
401 struct mqfs_info *mqfs;
404 mqfs = node->mn_info;
405 old = atomic_fetchadd_int(&node->mn_refcount, -1);
406 if (node->mn_type == mqfstype_dir ||
407 node->mn_type == mqfstype_root)
408 exp = 3; /* include . and .. */
412 int locked = sx_xlocked(&mqfs->mi_lock);
414 sx_xlock(&mqfs->mi_lock);
417 sx_xunlock(&mqfs->mi_lock);
422 * Add a node to a directory
425 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
427 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
428 KASSERT(parent->mn_info != NULL,
429 ("%s(): parent has no mn_info", __func__));
430 KASSERT(parent->mn_type == mqfstype_dir ||
431 parent->mn_type == mqfstype_root,
432 ("%s(): parent is not a directory", __func__));
434 node->mn_info = parent->mn_info;
435 node->mn_parent = parent;
436 LIST_INIT(&node->mn_children);
437 LIST_INIT(&node->mn_vnodes);
438 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
439 mqnode_addref(parent);
443 static struct mqfs_node *
444 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
447 struct mqfs_node *node;
449 node = mqnode_alloc();
450 strncpy(node->mn_name, name, namelen);
451 node->mn_pr_root = cred->cr_prison->pr_root;
452 node->mn_type = nodetype;
453 node->mn_refcount = 1;
454 vfs_timestamp(&node->mn_birth);
455 node->mn_ctime = node->mn_atime = node->mn_mtime
457 node->mn_uid = cred->cr_uid;
458 node->mn_gid = cred->cr_gid;
459 node->mn_mode = mode;
466 static struct mqfs_node *
467 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
468 struct ucred *cred, int mode)
470 struct mqfs_node *node;
472 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
473 if (mqfs_add_node(parent, node) != 0) {
481 * Add . and .. to a directory
484 mqfs_fixup_dir(struct mqfs_node *parent)
486 struct mqfs_node *dir;
488 dir = mqnode_alloc();
489 dir->mn_name[0] = '.';
490 dir->mn_type = mqfstype_this;
491 dir->mn_refcount = 1;
492 if (mqfs_add_node(parent, dir) != 0) {
497 dir = mqnode_alloc();
498 dir->mn_name[0] = dir->mn_name[1] = '.';
499 dir->mn_type = mqfstype_parent;
500 dir->mn_refcount = 1;
502 if (mqfs_add_node(parent, dir) != 0) {
515 static struct mqfs_node *
516 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
517 struct ucred *cred, int mode)
519 struct mqfs_node *node;
521 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
522 if (mqfs_add_node(parent, node) != 0) {
527 if (mqfs_fixup_dir(node) != 0) {
537 static struct mqfs_node *
538 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
539 struct ucred *cred, int mode)
541 struct mqfs_node *node;
543 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
544 if (mqfs_add_node(parent, node) != 0) {
554 * Destroy a node or a tree of nodes
557 mqfs_destroy(struct mqfs_node *node)
559 struct mqfs_node *parent;
561 KASSERT(node != NULL,
562 ("%s(): node is NULL", __func__));
563 KASSERT(node->mn_info != NULL,
564 ("%s(): node has no mn_info", __func__));
566 /* destroy children */
567 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
568 while (! LIST_EMPTY(&node->mn_children))
569 mqfs_destroy(LIST_FIRST(&node->mn_children));
571 /* unlink from parent */
572 if ((parent = node->mn_parent) != NULL) {
573 KASSERT(parent->mn_info == node->mn_info,
574 ("%s(): parent has different mn_info", __func__));
575 LIST_REMOVE(node, mn_sibling);
578 if (node->mn_fileno != 0)
579 mqfs_fileno_free(node->mn_info, node);
580 if (node->mn_data != NULL)
581 mqueue_free(node->mn_data);
587 * Mount a mqfs instance
590 mqfs_mount(struct mount *mp)
594 if (mp->mnt_flag & MNT_UPDATE)
597 mp->mnt_data = &mqfs_data;
599 mp->mnt_flag |= MNT_LOCAL;
604 vfs_mountedfrom(mp, "mqueue");
605 sbp->f_bsize = PAGE_SIZE;
606 sbp->f_iosize = PAGE_SIZE;
616 * Unmount a mqfs instance
619 mqfs_unmount(struct mount *mp, int mntflags)
623 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
629 * Return a root vnode
632 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
634 struct mqfs_info *mqfs;
637 mqfs = VFSTOMQFS(mp);
638 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
643 * Return filesystem stats
646 mqfs_statfs(struct mount *mp, struct statfs *sbp)
648 /* XXX update statistics */
653 * Initialize a mqfs instance
656 mqfs_init(struct vfsconf *vfc)
658 struct mqfs_node *root;
659 struct mqfs_info *mi;
660 osd_method_t methods[PR_MAXMETHOD] = {
661 [PR_METHOD_REMOVE] = mqfs_prison_remove,
664 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
665 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
666 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
667 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
668 mvdata_zone = uma_zcreate("mvdata",
669 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
670 NULL, UMA_ALIGN_PTR, 0);
671 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
672 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
674 sx_init(&mi->mi_lock, "mqfs lock");
675 /* set up the root diretory */
676 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
679 LIST_INIT(&root->mn_children);
680 LIST_INIT(&root->mn_vnodes);
682 mqfs_fileno_init(mi);
683 mqfs_fileno_alloc(mi, root);
684 mqfs_fixup_dir(root);
685 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
686 EVENTHANDLER_PRI_ANY);
687 mq_fdclose = mqueue_fdclose;
688 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
689 mqfs_osd_jail_slot = osd_jail_register(NULL, methods);
694 * Destroy a mqfs instance
697 mqfs_uninit(struct vfsconf *vfc)
699 struct mqfs_info *mi;
703 osd_jail_deregister(mqfs_osd_jail_slot);
704 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
706 mqfs_destroy(mi->mi_root);
708 mqfs_fileno_uninit(mi);
709 sx_destroy(&mi->mi_lock);
710 uma_zdestroy(mqnode_zone);
711 uma_zdestroy(mqueue_zone);
712 uma_zdestroy(mvdata_zone);
713 uma_zdestroy(mqnoti_zone);
721 do_recycle(void *context, int pending __unused)
723 struct vnode *vp = (struct vnode *)context;
725 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
735 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
737 struct mqfs_vdata *vd;
738 struct mqfs_info *mqfs;
739 struct vnode *newvpp;
744 sx_xlock(&mqfs->mi_lock);
745 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
746 if (vd->mv_vnode->v_mount == mp) {
755 sx_xunlock(&mqfs->mi_lock);
756 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
760 sx_xunlock(&mqfs->mi_lock);
762 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
765 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
766 error = insmntque(newvpp, mp);
770 sx_xlock(&mqfs->mi_lock);
772 * Check if it has already been allocated
773 * while we were blocked.
775 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
776 if (vd->mv_vnode->v_mount == mp) {
778 sx_xunlock(&mqfs->mi_lock);
788 vd = uma_zalloc(mvdata_zone, M_WAITOK);
792 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
793 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
795 switch (pn->mn_type) {
797 (*vpp)->v_vflag = VV_ROOT;
801 case mqfstype_parent:
802 (*vpp)->v_type = VDIR;
805 (*vpp)->v_type = VREG;
807 case mqfstype_symlink:
808 (*vpp)->v_type = VLNK;
811 KASSERT(0, ("mqfs_allocf called for null node\n"));
813 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
815 sx_xunlock(&mqfs->mi_lock);
820 * Search a directory entry
822 static struct mqfs_node *
823 mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred)
825 struct mqfs_node *pn;
828 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
829 pr_root = cred->cr_prison->pr_root;
830 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
831 /* Only match names within the same prison root directory */
832 if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) &&
833 strncmp(pn->mn_name, name, len) == 0 &&
834 pn->mn_name[len] == '\0')
841 * Look up a file or directory.
844 mqfs_lookupx(struct vop_cachedlookup_args *ap)
846 struct componentname *cnp;
847 struct vnode *dvp, **vpp;
848 struct mqfs_node *pd;
849 struct mqfs_node *pn;
850 struct mqfs_info *mqfs;
851 int nameiop, flags, error, namelen;
858 pname = cnp->cn_nameptr;
859 namelen = cnp->cn_namelen;
861 flags = cnp->cn_flags;
862 nameiop = cnp->cn_nameiop;
868 if (dvp->v_type != VDIR)
871 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
875 /* shortcut: check if the name is too long */
876 if (cnp->cn_namelen >= MQFS_NAMELEN)
880 if (namelen == 1 && pname[0] == '.') {
881 if ((flags & ISLASTCN) && nameiop != LOOKUP)
890 if (cnp->cn_flags & ISDOTDOT) {
891 if (dvp->v_vflag & VV_ROOT)
893 if ((flags & ISLASTCN) && nameiop != LOOKUP)
896 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
898 error = mqfs_allocv(dvp->v_mount, vpp, pn);
899 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
904 sx_xlock(&mqfs->mi_lock);
905 pn = mqfs_search(pd, pname, namelen, cnp->cn_cred);
908 sx_xunlock(&mqfs->mi_lock);
913 if (nameiop == DELETE && (flags & ISLASTCN)) {
914 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
928 error = mqfs_allocv(dvp->v_mount, vpp, pn);
930 if (error == 0 && cnp->cn_flags & MAKEENTRY)
931 cache_enter(dvp, *vpp, cnp);
937 /* will create a new entry in the directory ? */
938 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
939 && (flags & ISLASTCN)) {
940 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
943 cnp->cn_flags |= SAVENAME;
944 return (EJUSTRETURN);
950 struct vop_lookup_args {
951 struct vop_generic_args a_gen;
953 struct vnode **a_vpp;
954 struct componentname *a_cnp;
959 * vnode lookup operation
962 mqfs_lookup(struct vop_cachedlookup_args *ap)
966 rc = mqfs_lookupx(ap);
971 struct vop_create_args {
973 struct vnode **a_vpp;
974 struct componentname *a_cnp;
980 * vnode creation operation
983 mqfs_create(struct vop_create_args *ap)
985 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
986 struct componentname *cnp = ap->a_cnp;
987 struct mqfs_node *pd;
988 struct mqfs_node *pn;
992 pd = VTON(ap->a_dvp);
993 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
995 mq = mqueue_alloc(NULL);
998 sx_xlock(&mqfs->mi_lock);
999 if ((cnp->cn_flags & HASBUF) == 0)
1000 panic("%s: no name", __func__);
1001 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
1002 cnp->cn_cred, ap->a_vap->va_mode);
1004 sx_xunlock(&mqfs->mi_lock);
1008 sx_xunlock(&mqfs->mi_lock);
1009 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1025 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
1027 struct mqfs_node *parent;
1028 struct mqfs_vdata *vd;
1031 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1033 if (ucred->cr_uid != pn->mn_uid &&
1034 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1036 else if (!pn->mn_deleted) {
1037 parent = pn->mn_parent;
1038 pn->mn_parent = NULL;
1040 LIST_REMOVE(pn, mn_sibling);
1041 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1042 cache_purge(vd->mv_vnode);
1043 vhold(vd->mv_vnode);
1044 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1047 mqnode_release(parent);
1054 struct vop_remove_args {
1055 struct vnode *a_dvp;
1057 struct componentname *a_cnp;
1062 * vnode removal operation
1065 mqfs_remove(struct vop_remove_args *ap)
1067 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1068 struct mqfs_node *pn;
1071 if (ap->a_vp->v_type == VDIR)
1073 pn = VTON(ap->a_vp);
1074 sx_xlock(&mqfs->mi_lock);
1075 error = do_unlink(pn, ap->a_cnp->cn_cred);
1076 sx_xunlock(&mqfs->mi_lock);
1081 struct vop_inactive_args {
1083 struct thread *a_td;
1088 mqfs_inactive(struct vop_inactive_args *ap)
1090 struct mqfs_node *pn = VTON(ap->a_vp);
1098 struct vop_reclaim_args {
1099 struct vop_generic_args a_gen;
1101 struct thread *a_td;
1106 mqfs_reclaim(struct vop_reclaim_args *ap)
1108 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1109 struct vnode *vp = ap->a_vp;
1110 struct mqfs_node *pn;
1111 struct mqfs_vdata *vd;
1115 sx_xlock(&mqfs->mi_lock);
1117 LIST_REMOVE(vd, mv_link);
1118 uma_zfree(mvdata_zone, vd);
1120 sx_xunlock(&mqfs->mi_lock);
1125 struct vop_open_args {
1126 struct vop_generic_args a_gen;
1129 struct ucred *a_cred;
1130 struct thread *a_td;
1136 mqfs_open(struct vop_open_args *ap)
1142 struct vop_close_args {
1143 struct vop_generic_args a_gen;
1146 struct ucred *a_cred;
1147 struct thread *a_td;
1152 mqfs_close(struct vop_close_args *ap)
1158 struct vop_access_args {
1159 struct vop_generic_args a_gen;
1161 accmode_t a_accmode;
1162 struct ucred *a_cred;
1163 struct thread *a_td;
1168 * Verify permissions
1171 mqfs_access(struct vop_access_args *ap)
1173 struct vnode *vp = ap->a_vp;
1177 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1180 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1181 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1186 struct vop_getattr_args {
1187 struct vop_generic_args a_gen;
1189 struct vattr *a_vap;
1190 struct ucred *a_cred;
1195 * Get file attributes
1198 mqfs_getattr(struct vop_getattr_args *ap)
1200 struct vnode *vp = ap->a_vp;
1201 struct mqfs_node *pn = VTON(vp);
1202 struct vattr *vap = ap->a_vap;
1205 vap->va_type = vp->v_type;
1206 vap->va_mode = pn->mn_mode;
1208 vap->va_uid = pn->mn_uid;
1209 vap->va_gid = pn->mn_gid;
1210 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1211 vap->va_fileid = pn->mn_fileno;
1213 vap->va_blocksize = PAGE_SIZE;
1214 vap->va_bytes = vap->va_size = 0;
1215 vap->va_atime = pn->mn_atime;
1216 vap->va_mtime = pn->mn_mtime;
1217 vap->va_ctime = pn->mn_ctime;
1218 vap->va_birthtime = pn->mn_birth;
1221 vap->va_rdev = NODEV;
1223 vap->va_filerev = 0;
1228 struct vop_setattr_args {
1229 struct vop_generic_args a_gen;
1231 struct vattr *a_vap;
1232 struct ucred *a_cred;
1239 mqfs_setattr(struct vop_setattr_args *ap)
1241 struct mqfs_node *pn;
1252 if ((vap->va_type != VNON) ||
1253 (vap->va_nlink != VNOVAL) ||
1254 (vap->va_fsid != VNOVAL) ||
1255 (vap->va_fileid != VNOVAL) ||
1256 (vap->va_blocksize != VNOVAL) ||
1257 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1258 (vap->va_rdev != VNOVAL) ||
1259 ((int)vap->va_bytes != VNOVAL) ||
1260 (vap->va_gen != VNOVAL)) {
1267 if (vap->va_uid == (uid_t)VNOVAL)
1271 if (vap->va_gid == (gid_t)VNOVAL)
1276 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1278 * To modify the ownership of a file, must possess VADMIN
1281 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1285 * XXXRW: Why is there a privilege check here: shouldn't the
1286 * check in VOP_ACCESS() be enough? Also, are the group bits
1287 * below definitely right?
1289 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1290 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1291 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1298 if (vap->va_mode != (mode_t)VNOVAL) {
1299 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1300 (error = priv_check(td, PRIV_MQ_ADMIN)))
1302 pn->mn_mode = vap->va_mode;
1306 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1307 /* See the comment in ufs_vnops::ufs_setattr(). */
1308 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1309 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1310 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1312 if (vap->va_atime.tv_sec != VNOVAL) {
1313 pn->mn_atime = vap->va_atime;
1315 if (vap->va_mtime.tv_sec != VNOVAL) {
1316 pn->mn_mtime = vap->va_mtime;
1321 vfs_timestamp(&pn->mn_ctime);
1327 struct vop_read_args {
1328 struct vop_generic_args a_gen;
1332 struct ucred *a_cred;
1340 mqfs_read(struct vop_read_args *ap)
1343 struct vnode *vp = ap->a_vp;
1344 struct uio *uio = ap->a_uio;
1345 struct mqfs_node *pn;
1349 if (vp->v_type != VREG)
1354 snprintf(buf, sizeof(buf),
1355 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1360 buf[sizeof(buf)-1] = '\0';
1362 error = uiomove_frombuf(buf, len, uio);
1367 struct vop_readdir_args {
1368 struct vop_generic_args a_gen;
1371 struct ucred *a_cred;
1379 * Return directory entries.
1382 mqfs_readdir(struct vop_readdir_args *ap)
1385 struct mqfs_info *mi;
1386 struct mqfs_node *pd;
1387 struct mqfs_node *pn;
1388 struct dirent entry;
1390 const void *pr_root;
1391 int *tmp_ncookies = NULL;
1396 mi = VFSTOMQFS(vp->v_mount);
1400 if (vp->v_type != VDIR)
1403 if (uio->uio_offset < 0)
1406 if (ap->a_ncookies != NULL) {
1407 tmp_ncookies = ap->a_ncookies;
1408 *ap->a_ncookies = 0;
1409 ap->a_ncookies = NULL;
1415 pr_root = ap->a_cred->cr_prison->pr_root;
1416 sx_xlock(&mi->mi_lock);
1418 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1419 entry.d_reclen = sizeof(entry);
1422 * Only show names within the same prison root directory
1423 * (or not associated with a prison, e.g. "." and "..").
1425 if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root)
1428 mqfs_fileno_alloc(mi, pn);
1429 entry.d_fileno = pn->mn_fileno;
1430 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1431 entry.d_name[i] = pn->mn_name[i];
1432 entry.d_name[i] = 0;
1434 switch (pn->mn_type) {
1438 case mqfstype_parent:
1439 entry.d_type = DT_DIR;
1442 entry.d_type = DT_REG;
1444 case mqfstype_symlink:
1445 entry.d_type = DT_LNK;
1448 panic("%s has unexpected node type: %d", pn->mn_name,
1451 if (entry.d_reclen > uio->uio_resid)
1453 if (offset >= uio->uio_offset) {
1454 error = vfs_read_dirent(ap, &entry, offset);
1458 offset += entry.d_reclen;
1460 sx_xunlock(&mi->mi_lock);
1462 uio->uio_offset = offset;
1464 if (tmp_ncookies != NULL)
1465 ap->a_ncookies = tmp_ncookies;
1473 struct vop_mkdir_args {
1474 struct vnode *a_dvp;
1475 struvt vnode **a_vpp;
1476 struvt componentname *a_cnp;
1477 struct vattr *a_vap;
1482 * Create a directory.
1485 mqfs_mkdir(struct vop_mkdir_args *ap)
1487 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1488 struct componentname *cnp = ap->a_cnp;
1489 struct mqfs_node *pd = VTON(ap->a_dvp);
1490 struct mqfs_node *pn;
1493 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1495 sx_xlock(&mqfs->mi_lock);
1496 if ((cnp->cn_flags & HASBUF) == 0)
1497 panic("%s: no name", __func__);
1498 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1499 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1502 sx_xunlock(&mqfs->mi_lock);
1506 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1513 struct vop_rmdir_args {
1514 struct vnode *a_dvp;
1516 struct componentname *a_cnp;
1521 * Remove a directory.
1524 mqfs_rmdir(struct vop_rmdir_args *ap)
1526 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1527 struct mqfs_node *pn = VTON(ap->a_vp);
1528 struct mqfs_node *pt;
1530 if (pn->mn_type != mqfstype_dir)
1533 sx_xlock(&mqfs->mi_lock);
1534 if (pn->mn_deleted) {
1535 sx_xunlock(&mqfs->mi_lock);
1539 pt = LIST_FIRST(&pn->mn_children);
1540 pt = LIST_NEXT(pt, mn_sibling);
1541 pt = LIST_NEXT(pt, mn_sibling);
1543 sx_xunlock(&mqfs->mi_lock);
1547 pn->mn_parent = NULL;
1549 LIST_REMOVE(pn, mn_sibling);
1552 sx_xunlock(&mqfs->mi_lock);
1553 cache_purge(ap->a_vp);
1560 * See if this prison root is obsolete, and clean up associated queues if it is.
1563 mqfs_prison_remove(void *obj, void *data __unused)
1565 const struct prison *pr = obj;
1566 const struct prison *tpr;
1567 struct mqfs_node *pn, *tpn;
1571 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1572 if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0)
1577 * No jails are rooted in this directory anymore,
1578 * so no queues should be either.
1580 sx_xlock(&mqfs_data.mi_lock);
1581 LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children,
1583 if (pn->mn_pr_root == pr->pr_root)
1584 (void)do_unlink(pn, curthread->td_ucred);
1586 sx_xunlock(&mqfs_data.mi_lock);
1592 * Allocate a message queue
1594 static struct mqueue *
1595 mqueue_alloc(const struct mq_attr *attr)
1601 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1602 TAILQ_INIT(&mq->mq_msgq);
1604 mq->mq_maxmsg = attr->mq_maxmsg;
1605 mq->mq_msgsize = attr->mq_msgsize;
1607 mq->mq_maxmsg = default_maxmsg;
1608 mq->mq_msgsize = default_msgsize;
1610 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1611 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1612 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1613 atomic_add_int(&curmq, 1);
1618 * Destroy a message queue
1621 mqueue_free(struct mqueue *mq)
1623 struct mqueue_msg *msg;
1625 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1626 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1627 free(msg, M_MQUEUEDATA);
1630 mtx_destroy(&mq->mq_mutex);
1631 seldrain(&mq->mq_rsel);
1632 seldrain(&mq->mq_wsel);
1633 knlist_destroy(&mq->mq_rsel.si_note);
1634 knlist_destroy(&mq->mq_wsel.si_note);
1635 uma_zfree(mqueue_zone, mq);
1636 atomic_add_int(&curmq, -1);
1640 * Load a message from user space
1642 static struct mqueue_msg *
1643 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1645 struct mqueue_msg *msg;
1649 len = sizeof(struct mqueue_msg) + msg_size;
1650 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1651 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1654 free(msg, M_MQUEUEDATA);
1657 msg->msg_size = msg_size;
1658 msg->msg_prio = msg_prio;
1664 * Save a message to user space
1667 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1671 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1673 if (error == 0 && msg_prio != NULL)
1674 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1679 * Free a message's memory
1681 static __inline void
1682 mqueue_freemsg(struct mqueue_msg *msg)
1684 free(msg, M_MQUEUEDATA);
1688 * Send a message. if waitok is false, thread will not be
1689 * blocked if there is no data in queue, otherwise, absolute
1690 * time will be checked.
1693 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1694 size_t msg_len, unsigned msg_prio, int waitok,
1695 const struct timespec *abs_timeout)
1697 struct mqueue_msg *msg;
1698 struct timespec ts, ts2;
1702 if (msg_prio >= MQ_PRIO_MAX)
1704 if (msg_len > mq->mq_msgsize)
1706 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1710 /* O_NONBLOCK case */
1712 error = _mqueue_send(mq, msg, -1);
1718 /* we allow a null timeout (wait forever) */
1719 if (abs_timeout == NULL) {
1720 error = _mqueue_send(mq, msg, 0);
1726 /* send it before checking time */
1727 error = _mqueue_send(mq, msg, -1);
1731 if (error != EAGAIN)
1734 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1741 timespecsub(&ts2, &ts);
1742 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1746 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1747 error = _mqueue_send(mq, msg, tvtohz(&tv));
1748 if (error != ETIMEDOUT)
1754 mqueue_freemsg(msg);
1759 * Common routine to send a message
1762 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1764 struct mqueue_msg *msg2;
1767 mtx_lock(&mq->mq_mutex);
1768 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1770 mtx_unlock(&mq->mq_mutex);
1774 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1775 PCATCH, "mqsend", timo);
1777 if (error == EAGAIN)
1780 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1781 mtx_unlock(&mq->mq_mutex);
1785 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1786 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1788 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1789 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1791 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1792 if (msg2->msg_prio < msg->msg_prio)
1795 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1799 mq->mq_totalbytes += msg->msg_size;
1800 if (mq->mq_receivers)
1801 wakeup_one(&mq->mq_receivers);
1802 else if (mq->mq_notifier != NULL)
1803 mqueue_send_notification(mq);
1804 if (mq->mq_flags & MQ_RSEL) {
1805 mq->mq_flags &= ~MQ_RSEL;
1806 selwakeup(&mq->mq_rsel);
1808 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1809 mtx_unlock(&mq->mq_mutex);
1814 * Send realtime a signal to process which registered itself
1815 * successfully by mq_notify.
1818 mqueue_send_notification(struct mqueue *mq)
1820 struct mqueue_notifier *nt;
1825 mtx_assert(&mq->mq_mutex, MA_OWNED);
1826 nt = mq->mq_notifier;
1827 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1829 error = sigev_findtd(p, &nt->nt_sigev, &td);
1831 mq->mq_notifier = NULL;
1834 if (!KSI_ONQ(&nt->nt_ksi)) {
1835 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1836 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1840 mq->mq_notifier = NULL;
1844 * Get a message. if waitok is false, thread will not be
1845 * blocked if there is no data in queue, otherwise, absolute
1846 * time will be checked.
1849 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1850 size_t msg_len, unsigned *msg_prio, int waitok,
1851 const struct timespec *abs_timeout)
1853 struct mqueue_msg *msg;
1854 struct timespec ts, ts2;
1858 if (msg_len < mq->mq_msgsize)
1861 /* O_NONBLOCK case */
1863 error = _mqueue_recv(mq, &msg, -1);
1869 /* we allow a null timeout (wait forever). */
1870 if (abs_timeout == NULL) {
1871 error = _mqueue_recv(mq, &msg, 0);
1877 /* try to get a message before checking time */
1878 error = _mqueue_recv(mq, &msg, -1);
1882 if (error != EAGAIN)
1885 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1893 timespecsub(&ts2, &ts);
1894 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1898 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1899 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1902 if (error != ETIMEDOUT)
1907 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1909 curthread->td_retval[0] = msg->msg_size;
1910 curthread->td_retval[1] = 0;
1912 mqueue_freemsg(msg);
1917 * Common routine to receive a message
1920 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1924 mtx_lock(&mq->mq_mutex);
1925 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1927 mtx_unlock(&mq->mq_mutex);
1931 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1932 PCATCH, "mqrecv", timo);
1934 if (error == EAGAIN)
1939 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1941 mq->mq_totalbytes -= (*msg)->msg_size;
1943 wakeup_one(&mq->mq_senders);
1944 if (mq->mq_flags & MQ_WSEL) {
1945 mq->mq_flags &= ~MQ_WSEL;
1946 selwakeup(&mq->mq_wsel);
1948 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1950 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1951 !TAILQ_EMPTY(&mq->mq_msgq)) {
1952 mqueue_send_notification(mq);
1954 mtx_unlock(&mq->mq_mutex);
1958 static __inline struct mqueue_notifier *
1959 notifier_alloc(void)
1961 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1964 static __inline void
1965 notifier_free(struct mqueue_notifier *p)
1967 uma_zfree(mqnoti_zone, p);
1970 static struct mqueue_notifier *
1971 notifier_search(struct proc *p, int fd)
1973 struct mqueue_notifier *nt;
1975 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1976 if (nt->nt_ksi.ksi_mqd == fd)
1982 static __inline void
1983 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1985 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1988 static __inline void
1989 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1991 LIST_REMOVE(nt, nt_link);
1996 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1998 struct mqueue_notifier *nt;
2000 mtx_assert(&mq->mq_mutex, MA_OWNED);
2002 nt = notifier_search(p, fd);
2004 if (mq->mq_notifier == nt)
2005 mq->mq_notifier = NULL;
2006 sigqueue_take(&nt->nt_ksi);
2007 notifier_delete(p, nt);
2013 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
2014 const struct mq_attr *attr)
2016 char path[MQFS_NAMELEN + 1];
2017 struct mqfs_node *pn;
2018 struct filedesc *fdp;
2021 int fd, error, len, cmode;
2023 AUDIT_ARG_FFLAGS(flags);
2024 AUDIT_ARG_MODE(mode);
2026 fdp = td->td_proc->p_fd;
2027 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
2029 if ((flags & O_CREAT) != 0 && attr != NULL) {
2030 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
2032 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
2036 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
2041 * The first character of name must be a slash (/) character
2042 * and the remaining characters of name cannot include any slash
2046 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2048 AUDIT_ARG_UPATH1_CANON(path);
2050 error = falloc(td, &fp, &fd, O_CLOEXEC);
2054 sx_xlock(&mqfs_data.mi_lock);
2055 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2057 if (!(flags & O_CREAT)) {
2060 mq = mqueue_alloc(attr);
2064 pn = mqfs_create_file(mqfs_data.mi_root,
2065 path + 1, len - 1, td->td_ucred,
2078 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2081 accmode_t accmode = 0;
2087 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2088 pn->mn_gid, accmode, td->td_ucred, NULL);
2093 sx_xunlock(&mqfs_data.mi_lock);
2094 fdclose(td, fp, fd);
2100 sx_xunlock(&mqfs_data.mi_lock);
2102 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2105 td->td_retval[0] = fd;
2111 * Syscall to open a message queue.
2114 sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
2116 struct mq_attr attr;
2119 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2121 flags = FFLAGS(uap->flags);
2122 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2123 error = copyin(uap->attr, &attr, sizeof(attr));
2127 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2128 uap->attr != NULL ? &attr : NULL));
2132 * Syscall to unlink a message queue.
2135 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2137 char path[MQFS_NAMELEN+1];
2138 struct mqfs_node *pn;
2141 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2146 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2148 AUDIT_ARG_UPATH1_CANON(path);
2150 sx_xlock(&mqfs_data.mi_lock);
2151 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2153 error = do_unlink(pn, td->td_ucred);
2156 sx_xunlock(&mqfs_data.mi_lock);
2160 typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **);
2163 * Get message queue by giving file slot
2166 _getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func,
2167 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2169 struct mqfs_node *pn;
2172 error = func(td, fd, rightsp, fpp);
2175 if (&mqueueops != (*fpp)->f_ops) {
2179 pn = (*fpp)->f_data;
2188 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2189 struct mqueue **pmq)
2191 cap_rights_t rights;
2193 return _getmq(td, fd, cap_rights_init(&rights, CAP_EVENT), fget,
2198 getmq_read(struct thread *td, int fd, struct file **fpp,
2199 struct mqfs_node **ppn, struct mqueue **pmq)
2201 cap_rights_t rights;
2203 return _getmq(td, fd, cap_rights_init(&rights, CAP_READ), fget_read,
2208 getmq_write(struct thread *td, int fd, struct file **fpp,
2209 struct mqfs_node **ppn, struct mqueue **pmq)
2211 cap_rights_t rights;
2213 return _getmq(td, fd, cap_rights_init(&rights, CAP_WRITE), fget_write,
2218 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2219 struct mq_attr *oattr)
2227 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2229 error = getmq(td, mqd, &fp, NULL, &mq);
2232 oattr->mq_maxmsg = mq->mq_maxmsg;
2233 oattr->mq_msgsize = mq->mq_msgsize;
2234 oattr->mq_curmsgs = mq->mq_curmsgs;
2237 oflag = flag = fp->f_flag;
2238 flag &= ~O_NONBLOCK;
2239 flag |= (attr->mq_flags & O_NONBLOCK);
2240 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2243 oattr->mq_flags = (O_NONBLOCK & oflag);
2249 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2251 struct mq_attr attr, oattr;
2254 if (uap->attr != NULL) {
2255 error = copyin(uap->attr, &attr, sizeof(attr));
2259 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2261 if (error == 0 && uap->oattr != NULL) {
2262 bzero(oattr.__reserved, sizeof(oattr.__reserved));
2263 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2269 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2273 struct timespec *abs_timeout, ets;
2277 AUDIT_ARG_FD(uap->mqd);
2278 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2281 if (uap->abs_timeout != NULL) {
2282 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2288 waitok = !(fp->f_flag & O_NONBLOCK);
2289 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2290 uap->msg_prio, waitok, abs_timeout);
2296 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2300 struct timespec *abs_timeout, ets;
2303 AUDIT_ARG_FD(uap->mqd);
2304 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2307 if (uap->abs_timeout != NULL) {
2308 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2314 waitok = !(fp->f_flag & O_NONBLOCK);
2315 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2316 uap->msg_prio, waitok, abs_timeout);
2322 kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
2325 cap_rights_t rights;
2327 struct filedesc *fdp;
2330 struct file *fp, *fp2;
2331 struct mqueue_notifier *nt, *newnt = NULL;
2335 if (sigev != NULL) {
2336 if (sigev->sigev_notify != SIGEV_SIGNAL &&
2337 sigev->sigev_notify != SIGEV_THREAD_ID &&
2338 sigev->sigev_notify != SIGEV_NONE)
2340 if ((sigev->sigev_notify == SIGEV_SIGNAL ||
2341 sigev->sigev_notify == SIGEV_THREAD_ID) &&
2342 !_SIG_VALID(sigev->sigev_signo))
2346 fdp = td->td_proc->p_fd;
2347 error = getmq(td, mqd, &fp, NULL, &mq);
2351 FILEDESC_SLOCK(fdp);
2352 fp2 = fget_locked(fdp, mqd);
2354 FILEDESC_SUNLOCK(fdp);
2359 error = cap_check(cap_rights(fdp, mqd),
2360 cap_rights_init(&rights, CAP_EVENT));
2362 FILEDESC_SUNLOCK(fdp);
2367 FILEDESC_SUNLOCK(fdp);
2371 mtx_lock(&mq->mq_mutex);
2372 FILEDESC_SUNLOCK(fdp);
2373 if (sigev != NULL) {
2374 if (mq->mq_notifier != NULL) {
2378 nt = notifier_search(p, mqd);
2380 if (newnt == NULL) {
2382 mtx_unlock(&mq->mq_mutex);
2383 newnt = notifier_alloc();
2389 sigqueue_take(&nt->nt_ksi);
2390 if (newnt != NULL) {
2391 notifier_free(newnt);
2397 ksiginfo_init(&nt->nt_ksi);
2398 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2399 nt->nt_ksi.ksi_code = SI_MESGQ;
2401 nt->nt_ksi.ksi_mqd = mqd;
2402 notifier_insert(p, nt);
2404 nt->nt_sigev = *sigev;
2405 mq->mq_notifier = nt;
2408 * if there is no receivers and message queue
2409 * is not empty, we should send notification
2410 * as soon as possible.
2412 if (mq->mq_receivers == 0 &&
2413 !TAILQ_EMPTY(&mq->mq_msgq))
2414 mqueue_send_notification(mq);
2417 notifier_remove(p, mq, mqd);
2419 mtx_unlock(&mq->mq_mutex);
2424 notifier_free(newnt);
2429 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2431 struct sigevent ev, *evp;
2434 if (uap->sigev == NULL) {
2437 error = copyin(uap->sigev, &ev, sizeof(ev));
2442 return (kern_kmq_notify(td, uap->mqd, evp));
2446 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2448 struct filedesc *fdp;
2451 fdp = td->td_proc->p_fd;
2452 FILEDESC_LOCK_ASSERT(fdp);
2454 if (fp->f_ops == &mqueueops) {
2456 mtx_lock(&mq->mq_mutex);
2457 notifier_remove(td->td_proc, mq, fd);
2459 /* have to wakeup thread in same process */
2460 if (mq->mq_flags & MQ_RSEL) {
2461 mq->mq_flags &= ~MQ_RSEL;
2462 selwakeup(&mq->mq_rsel);
2464 if (mq->mq_flags & MQ_WSEL) {
2465 mq->mq_flags &= ~MQ_WSEL;
2466 selwakeup(&mq->mq_wsel);
2468 mtx_unlock(&mq->mq_mutex);
2473 mq_proc_exit(void *arg __unused, struct proc *p)
2475 struct filedesc *fdp;
2481 FILEDESC_SLOCK(fdp);
2482 for (i = 0; i < fdp->fd_nfiles; ++i) {
2483 fp = fget_locked(fdp, i);
2484 if (fp != NULL && fp->f_ops == &mqueueops) {
2486 mtx_lock(&mq->mq_mutex);
2487 notifier_remove(p, FPTOMQ(fp), i);
2488 mtx_unlock(&mq->mq_mutex);
2491 FILEDESC_SUNLOCK(fdp);
2492 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2496 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2499 struct mqueue *mq = FPTOMQ(fp);
2502 mtx_lock(&mq->mq_mutex);
2503 if (events & (POLLIN | POLLRDNORM)) {
2504 if (mq->mq_curmsgs) {
2505 revents |= events & (POLLIN | POLLRDNORM);
2507 mq->mq_flags |= MQ_RSEL;
2508 selrecord(td, &mq->mq_rsel);
2511 if (events & POLLOUT) {
2512 if (mq->mq_curmsgs < mq->mq_maxmsg)
2515 mq->mq_flags |= MQ_WSEL;
2516 selrecord(td, &mq->mq_wsel);
2519 mtx_unlock(&mq->mq_mutex);
2524 mqf_close(struct file *fp, struct thread *td)
2526 struct mqfs_node *pn;
2528 fp->f_ops = &badfileops;
2531 sx_xlock(&mqfs_data.mi_lock);
2533 sx_xunlock(&mqfs_data.mi_lock);
2538 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2541 struct mqfs_node *pn = fp->f_data;
2543 bzero(st, sizeof *st);
2544 sx_xlock(&mqfs_data.mi_lock);
2545 st->st_atim = pn->mn_atime;
2546 st->st_mtim = pn->mn_mtime;
2547 st->st_ctim = pn->mn_ctime;
2548 st->st_birthtim = pn->mn_birth;
2549 st->st_uid = pn->mn_uid;
2550 st->st_gid = pn->mn_gid;
2551 st->st_mode = S_IFIFO | pn->mn_mode;
2552 sx_xunlock(&mqfs_data.mi_lock);
2557 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2560 struct mqfs_node *pn;
2565 sx_xlock(&mqfs_data.mi_lock);
2566 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
2570 pn->mn_mode = mode & ACCESSPERMS;
2572 sx_xunlock(&mqfs_data.mi_lock);
2577 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2580 struct mqfs_node *pn;
2585 sx_xlock(&mqfs_data.mi_lock);
2586 if (uid == (uid_t)-1)
2588 if (gid == (gid_t)-1)
2590 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
2591 (gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
2592 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
2597 sx_xunlock(&mqfs_data.mi_lock);
2602 mqf_kqfilter(struct file *fp, struct knote *kn)
2604 struct mqueue *mq = FPTOMQ(fp);
2607 if (kn->kn_filter == EVFILT_READ) {
2608 kn->kn_fop = &mq_rfiltops;
2609 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2610 } else if (kn->kn_filter == EVFILT_WRITE) {
2611 kn->kn_fop = &mq_wfiltops;
2612 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2619 filt_mqdetach(struct knote *kn)
2621 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2623 if (kn->kn_filter == EVFILT_READ)
2624 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2625 else if (kn->kn_filter == EVFILT_WRITE)
2626 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2628 panic("filt_mqdetach");
2632 filt_mqread(struct knote *kn, long hint)
2634 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2636 mtx_assert(&mq->mq_mutex, MA_OWNED);
2637 return (mq->mq_curmsgs != 0);
2641 filt_mqwrite(struct knote *kn, long hint)
2643 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2645 mtx_assert(&mq->mq_mutex, MA_OWNED);
2646 return (mq->mq_curmsgs < mq->mq_maxmsg);
2650 mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
2653 kif->kf_type = KF_TYPE_MQUEUE;
2657 static struct fileops mqueueops = {
2658 .fo_read = invfo_rdwr,
2659 .fo_write = invfo_rdwr,
2660 .fo_truncate = invfo_truncate,
2661 .fo_ioctl = invfo_ioctl,
2662 .fo_poll = mqf_poll,
2663 .fo_kqfilter = mqf_kqfilter,
2664 .fo_stat = mqf_stat,
2665 .fo_close = mqf_close,
2666 .fo_chmod = mqf_chmod,
2667 .fo_chown = mqf_chown,
2668 .fo_sendfile = invfo_sendfile,
2669 .fo_fill_kinfo = mqf_fill_kinfo,
2672 static struct vop_vector mqfs_vnodeops = {
2673 .vop_default = &default_vnodeops,
2674 .vop_access = mqfs_access,
2675 .vop_cachedlookup = mqfs_lookup,
2676 .vop_lookup = vfs_cache_lookup,
2677 .vop_reclaim = mqfs_reclaim,
2678 .vop_create = mqfs_create,
2679 .vop_remove = mqfs_remove,
2680 .vop_inactive = mqfs_inactive,
2681 .vop_open = mqfs_open,
2682 .vop_close = mqfs_close,
2683 .vop_getattr = mqfs_getattr,
2684 .vop_setattr = mqfs_setattr,
2685 .vop_read = mqfs_read,
2686 .vop_write = VOP_EOPNOTSUPP,
2687 .vop_readdir = mqfs_readdir,
2688 .vop_mkdir = VOP_EOPNOTSUPP,
2689 .vop_rmdir = VOP_EOPNOTSUPP
2692 static struct vfsops mqfs_vfsops = {
2693 .vfs_init = mqfs_init,
2694 .vfs_uninit = mqfs_uninit,
2695 .vfs_mount = mqfs_mount,
2696 .vfs_unmount = mqfs_unmount,
2697 .vfs_root = mqfs_root,
2698 .vfs_statfs = mqfs_statfs,
2701 static struct vfsconf mqueuefs_vfsconf = {
2702 .vfc_version = VFS_VERSION,
2703 .vfc_name = "mqueuefs",
2704 .vfc_vfsops = &mqfs_vfsops,
2706 .vfc_flags = VFCF_SYNTHETIC
2709 static struct syscall_helper_data mq_syscalls[] = {
2710 SYSCALL_INIT_HELPER(kmq_open),
2711 SYSCALL_INIT_HELPER(kmq_setattr),
2712 SYSCALL_INIT_HELPER(kmq_timedsend),
2713 SYSCALL_INIT_HELPER(kmq_timedreceive),
2714 SYSCALL_INIT_HELPER(kmq_notify),
2715 SYSCALL_INIT_HELPER(kmq_unlink),
2719 #ifdef COMPAT_FREEBSD32
2720 #include <compat/freebsd32/freebsd32.h>
2721 #include <compat/freebsd32/freebsd32_proto.h>
2722 #include <compat/freebsd32/freebsd32_signal.h>
2723 #include <compat/freebsd32/freebsd32_syscall.h>
2724 #include <compat/freebsd32/freebsd32_util.h>
2727 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2730 to->mq_flags = from->mq_flags;
2731 to->mq_maxmsg = from->mq_maxmsg;
2732 to->mq_msgsize = from->mq_msgsize;
2733 to->mq_curmsgs = from->mq_curmsgs;
2737 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2740 to->mq_flags = from->mq_flags;
2741 to->mq_maxmsg = from->mq_maxmsg;
2742 to->mq_msgsize = from->mq_msgsize;
2743 to->mq_curmsgs = from->mq_curmsgs;
2747 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
2749 struct mq_attr attr;
2750 struct mq_attr32 attr32;
2753 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2755 flags = FFLAGS(uap->flags);
2756 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2757 error = copyin(uap->attr, &attr32, sizeof(attr32));
2760 mq_attr_from32(&attr32, &attr);
2762 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2763 uap->attr != NULL ? &attr : NULL));
2767 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
2769 struct mq_attr attr, oattr;
2770 struct mq_attr32 attr32, oattr32;
2773 if (uap->attr != NULL) {
2774 error = copyin(uap->attr, &attr32, sizeof(attr32));
2777 mq_attr_from32(&attr32, &attr);
2779 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2781 if (error == 0 && uap->oattr != NULL) {
2782 mq_attr_to32(&oattr, &oattr32);
2783 bzero(oattr32.__reserved, sizeof(oattr32.__reserved));
2784 error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2790 freebsd32_kmq_timedsend(struct thread *td,
2791 struct freebsd32_kmq_timedsend_args *uap)
2795 struct timespec32 ets32;
2796 struct timespec *abs_timeout, ets;
2800 AUDIT_ARG_FD(uap->mqd);
2801 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2804 if (uap->abs_timeout != NULL) {
2805 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2808 CP(ets32, ets, tv_sec);
2809 CP(ets32, ets, tv_nsec);
2813 waitok = !(fp->f_flag & O_NONBLOCK);
2814 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2815 uap->msg_prio, waitok, abs_timeout);
2821 freebsd32_kmq_timedreceive(struct thread *td,
2822 struct freebsd32_kmq_timedreceive_args *uap)
2826 struct timespec32 ets32;
2827 struct timespec *abs_timeout, ets;
2830 AUDIT_ARG_FD(uap->mqd);
2831 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2834 if (uap->abs_timeout != NULL) {
2835 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2838 CP(ets32, ets, tv_sec);
2839 CP(ets32, ets, tv_nsec);
2843 waitok = !(fp->f_flag & O_NONBLOCK);
2844 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2845 uap->msg_prio, waitok, abs_timeout);
2851 freebsd32_kmq_notify(struct thread *td, struct freebsd32_kmq_notify_args *uap)
2853 struct sigevent ev, *evp;
2854 struct sigevent32 ev32;
2857 if (uap->sigev == NULL) {
2860 error = copyin(uap->sigev, &ev32, sizeof(ev32));
2863 error = convert_sigevent32(&ev32, &ev);
2868 return (kern_kmq_notify(td, uap->mqd, evp));
2871 static struct syscall_helper_data mq32_syscalls[] = {
2872 SYSCALL32_INIT_HELPER(freebsd32_kmq_open),
2873 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr),
2874 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend),
2875 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive),
2876 SYSCALL32_INIT_HELPER(freebsd32_kmq_notify),
2877 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink),
2887 error = syscall_helper_register(mq_syscalls, SY_THR_STATIC_KLD);
2890 #ifdef COMPAT_FREEBSD32
2891 error = syscall32_helper_register(mq32_syscalls, SY_THR_STATIC_KLD);
2902 #ifdef COMPAT_FREEBSD32
2903 syscall32_helper_unregister(mq32_syscalls);
2905 syscall_helper_unregister(mq_syscalls);
2910 mq_modload(struct module *module, int cmd, void *arg)
2914 error = vfs_modevent(module, cmd, arg);
2933 static moduledata_t mqueuefs_mod = {
2938 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
2939 MODULE_VERSION(mqueuefs, 1);