2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * POSIX message queue implementation.
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.
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.
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
48 #include "opt_capsicum.h"
49 #include "opt_compat.h"
51 #include <sys/param.h>
52 #include <sys/kernel.h>
53 #include <sys/systm.h>
54 #include <sys/limits.h>
55 #include <sys/malloc.h>
57 #include <sys/capsicum.h>
58 #include <sys/dirent.h>
59 #include <sys/event.h>
60 #include <sys/eventhandler.h>
61 #include <sys/fcntl.h>
63 #include <sys/filedesc.h>
66 #include <sys/module.h>
67 #include <sys/mount.h>
68 #include <sys/mqueue.h>
69 #include <sys/mutex.h>
70 #include <sys/namei.h>
71 #include <sys/posix4.h>
75 #include <sys/queue.h>
76 #include <sys/sysproto.h>
78 #include <sys/syscall.h>
79 #include <sys/syscallsubr.h>
80 #include <sys/sysent.h>
82 #include <sys/sysctl.h>
83 #include <sys/taskqueue.h>
84 #include <sys/unistd.h>
86 #include <sys/vnode.h>
87 #include <machine/atomic.h>
89 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
92 * Limits and constants
94 #define MQFS_NAMELEN NAME_MAX
95 #define MQFS_DELEN (8 + MQFS_NAMELEN)
111 * mqfs_info: describes a mqfs instance
115 struct mqfs_node *mi_root;
116 struct unrhdr *mi_unrhdr;
120 LIST_ENTRY(mqfs_vdata) mv_link;
121 struct mqfs_node *mv_node;
122 struct vnode *mv_vnode;
127 * mqfs_node: describes a node (file or directory) within a mqfs
130 char mn_name[MQFS_NAMELEN+1];
131 struct mqfs_info *mn_info;
132 struct mqfs_node *mn_parent;
133 LIST_HEAD(,mqfs_node) mn_children;
134 LIST_ENTRY(mqfs_node) mn_sibling;
135 LIST_HEAD(,mqfs_vdata) mn_vnodes;
136 const void *mn_pr_root;
142 struct timespec mn_birth;
143 struct timespec mn_ctime;
144 struct timespec mn_atime;
145 struct timespec mn_mtime;
151 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
152 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
153 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
154 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
155 (fp)->f_data)->mn_data))
157 TAILQ_HEAD(msgq, mqueue_msg);
161 struct mqueue_notifier {
162 LIST_ENTRY(mqueue_notifier) nt_link;
163 struct sigevent nt_sigev;
165 struct proc *nt_proc;
178 struct selinfo mq_rsel;
179 struct selinfo mq_wsel;
180 struct mqueue_notifier *mq_notifier;
187 TAILQ_ENTRY(mqueue_msg) msg_link;
188 unsigned int msg_prio;
189 unsigned int msg_size;
190 /* following real data... */
193 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
194 "POSIX real time message queue");
196 static int default_maxmsg = 10;
197 static int default_msgsize = 1024;
199 static int maxmsg = 100;
200 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
201 &maxmsg, 0, "Default maximum messages in queue");
202 static int maxmsgsize = 16384;
203 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
204 &maxmsgsize, 0, "Default maximum message size");
205 static int maxmq = 100;
206 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
207 &maxmq, 0, "maximum message queues");
208 static int curmq = 0;
209 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
210 &curmq, 0, "current message queue number");
211 static int unloadable = 0;
212 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
214 static eventhandler_tag exit_tag;
216 /* Only one instance per-system */
217 static struct mqfs_info mqfs_data;
218 static uma_zone_t mqnode_zone;
219 static uma_zone_t mqueue_zone;
220 static uma_zone_t mvdata_zone;
221 static uma_zone_t mqnoti_zone;
222 static struct vop_vector mqfs_vnodeops;
223 static struct fileops mqueueops;
224 static unsigned mqfs_osd_jail_slot;
227 * Directory structure construction and manipulation
230 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
231 const char *name, int namelen, struct ucred *cred, int mode);
232 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
233 const char *name, int namelen, struct ucred *cred, int mode);
236 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
237 const char *name, int namelen, struct ucred *cred, int mode);
238 static int mqfs_destroy(struct mqfs_node *mn);
239 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
240 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
241 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
242 static int mqfs_prison_remove(void *obj, void *data);
245 * Message queue construction and maniplation
247 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
248 static void mqueue_free(struct mqueue *mq);
249 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
250 size_t msg_len, unsigned msg_prio, int waitok,
251 const struct timespec *abs_timeout);
252 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
253 size_t msg_len, unsigned *msg_prio, int waitok,
254 const struct timespec *abs_timeout);
255 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
257 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
259 static void mqueue_send_notification(struct mqueue *mq);
260 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
261 static void mq_proc_exit(void *arg, struct proc *p);
266 static void filt_mqdetach(struct knote *kn);
267 static int filt_mqread(struct knote *kn, long hint);
268 static int filt_mqwrite(struct knote *kn, long hint);
270 struct filterops mq_rfiltops = {
272 .f_detach = filt_mqdetach,
273 .f_event = filt_mqread,
275 struct filterops mq_wfiltops = {
277 .f_detach = filt_mqdetach,
278 .f_event = filt_mqwrite,
282 * Initialize fileno bitmap
285 mqfs_fileno_init(struct mqfs_info *mi)
289 up = new_unrhdr(1, INT_MAX, NULL);
294 * Tear down fileno bitmap
297 mqfs_fileno_uninit(struct mqfs_info *mi)
302 mi->mi_unrhdr = NULL;
307 * Allocate a file number
310 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
312 /* make sure our parent has a file number */
313 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
314 mqfs_fileno_alloc(mi, mn->mn_parent);
316 switch (mn->mn_type) {
320 case mqfstype_symlink:
321 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
324 KASSERT(mn->mn_parent != NULL,
325 ("mqfstype_this node has no parent"));
326 mn->mn_fileno = mn->mn_parent->mn_fileno;
328 case mqfstype_parent:
329 KASSERT(mn->mn_parent != NULL,
330 ("mqfstype_parent node has no parent"));
331 if (mn->mn_parent == mi->mi_root) {
332 mn->mn_fileno = mn->mn_parent->mn_fileno;
335 KASSERT(mn->mn_parent->mn_parent != NULL,
336 ("mqfstype_parent node has no grandparent"));
337 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
341 ("mqfs_fileno_alloc() called for unknown type node: %d",
348 * Release a file number
351 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
353 switch (mn->mn_type) {
357 case mqfstype_symlink:
358 free_unr(mi->mi_unrhdr, mn->mn_fileno);
361 case mqfstype_parent:
362 /* ignore these, as they don't "own" their file number */
366 ("mqfs_fileno_free() called for unknown type node: %d",
372 static __inline struct mqfs_node *
375 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
379 mqnode_free(struct mqfs_node *node)
381 uma_zfree(mqnode_zone, node);
385 mqnode_addref(struct mqfs_node *node)
387 atomic_fetchadd_int(&node->mn_refcount, 1);
391 mqnode_release(struct mqfs_node *node)
393 struct mqfs_info *mqfs;
396 mqfs = node->mn_info;
397 old = atomic_fetchadd_int(&node->mn_refcount, -1);
398 if (node->mn_type == mqfstype_dir ||
399 node->mn_type == mqfstype_root)
400 exp = 3; /* include . and .. */
404 int locked = sx_xlocked(&mqfs->mi_lock);
406 sx_xlock(&mqfs->mi_lock);
409 sx_xunlock(&mqfs->mi_lock);
414 * Add a node to a directory
417 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
419 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
420 KASSERT(parent->mn_info != NULL,
421 ("%s(): parent has no mn_info", __func__));
422 KASSERT(parent->mn_type == mqfstype_dir ||
423 parent->mn_type == mqfstype_root,
424 ("%s(): parent is not a directory", __func__));
426 node->mn_info = parent->mn_info;
427 node->mn_parent = parent;
428 LIST_INIT(&node->mn_children);
429 LIST_INIT(&node->mn_vnodes);
430 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
431 mqnode_addref(parent);
435 static struct mqfs_node *
436 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
439 struct mqfs_node *node;
441 node = mqnode_alloc();
442 strncpy(node->mn_name, name, namelen);
443 node->mn_pr_root = cred->cr_prison->pr_root;
444 node->mn_type = nodetype;
445 node->mn_refcount = 1;
446 vfs_timestamp(&node->mn_birth);
447 node->mn_ctime = node->mn_atime = node->mn_mtime
449 node->mn_uid = cred->cr_uid;
450 node->mn_gid = cred->cr_gid;
451 node->mn_mode = mode;
458 static struct mqfs_node *
459 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
460 struct ucred *cred, int mode)
462 struct mqfs_node *node;
464 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
465 if (mqfs_add_node(parent, node) != 0) {
473 * Add . and .. to a directory
476 mqfs_fixup_dir(struct mqfs_node *parent)
478 struct mqfs_node *dir;
480 dir = mqnode_alloc();
481 dir->mn_name[0] = '.';
482 dir->mn_type = mqfstype_this;
483 dir->mn_refcount = 1;
484 if (mqfs_add_node(parent, dir) != 0) {
489 dir = mqnode_alloc();
490 dir->mn_name[0] = dir->mn_name[1] = '.';
491 dir->mn_type = mqfstype_parent;
492 dir->mn_refcount = 1;
494 if (mqfs_add_node(parent, dir) != 0) {
507 static struct mqfs_node *
508 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
509 struct ucred *cred, int mode)
511 struct mqfs_node *node;
513 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
514 if (mqfs_add_node(parent, node) != 0) {
519 if (mqfs_fixup_dir(node) != 0) {
529 static struct mqfs_node *
530 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
531 struct ucred *cred, int mode)
533 struct mqfs_node *node;
535 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
536 if (mqfs_add_node(parent, node) != 0) {
546 * Destroy a node or a tree of nodes
549 mqfs_destroy(struct mqfs_node *node)
551 struct mqfs_node *parent;
553 KASSERT(node != NULL,
554 ("%s(): node is NULL", __func__));
555 KASSERT(node->mn_info != NULL,
556 ("%s(): node has no mn_info", __func__));
558 /* destroy children */
559 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
560 while (! LIST_EMPTY(&node->mn_children))
561 mqfs_destroy(LIST_FIRST(&node->mn_children));
563 /* unlink from parent */
564 if ((parent = node->mn_parent) != NULL) {
565 KASSERT(parent->mn_info == node->mn_info,
566 ("%s(): parent has different mn_info", __func__));
567 LIST_REMOVE(node, mn_sibling);
570 if (node->mn_fileno != 0)
571 mqfs_fileno_free(node->mn_info, node);
572 if (node->mn_data != NULL)
573 mqueue_free(node->mn_data);
579 * Mount a mqfs instance
582 mqfs_mount(struct mount *mp)
586 if (mp->mnt_flag & MNT_UPDATE)
589 mp->mnt_data = &mqfs_data;
591 mp->mnt_flag |= MNT_LOCAL;
596 vfs_mountedfrom(mp, "mqueue");
597 sbp->f_bsize = PAGE_SIZE;
598 sbp->f_iosize = PAGE_SIZE;
608 * Unmount a mqfs instance
611 mqfs_unmount(struct mount *mp, int mntflags)
615 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
621 * Return a root vnode
624 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
626 struct mqfs_info *mqfs;
629 mqfs = VFSTOMQFS(mp);
630 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
635 * Return filesystem stats
638 mqfs_statfs(struct mount *mp, struct statfs *sbp)
640 /* XXX update statistics */
645 * Initialize a mqfs instance
648 mqfs_init(struct vfsconf *vfc)
650 struct mqfs_node *root;
651 struct mqfs_info *mi;
652 osd_method_t methods[PR_MAXMETHOD] = {
653 [PR_METHOD_REMOVE] = mqfs_prison_remove,
656 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
657 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
658 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
659 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
660 mvdata_zone = uma_zcreate("mvdata",
661 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
662 NULL, UMA_ALIGN_PTR, 0);
663 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
664 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
666 sx_init(&mi->mi_lock, "mqfs lock");
667 /* set up the root diretory */
668 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
671 LIST_INIT(&root->mn_children);
672 LIST_INIT(&root->mn_vnodes);
674 mqfs_fileno_init(mi);
675 mqfs_fileno_alloc(mi, root);
676 mqfs_fixup_dir(root);
677 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
678 EVENTHANDLER_PRI_ANY);
679 mq_fdclose = mqueue_fdclose;
680 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
681 mqfs_osd_jail_slot = osd_jail_register(NULL, methods);
686 * Destroy a mqfs instance
689 mqfs_uninit(struct vfsconf *vfc)
691 struct mqfs_info *mi;
695 osd_jail_deregister(mqfs_osd_jail_slot);
696 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
698 mqfs_destroy(mi->mi_root);
700 mqfs_fileno_uninit(mi);
701 sx_destroy(&mi->mi_lock);
702 uma_zdestroy(mqnode_zone);
703 uma_zdestroy(mqueue_zone);
704 uma_zdestroy(mvdata_zone);
705 uma_zdestroy(mqnoti_zone);
713 do_recycle(void *context, int pending __unused)
715 struct vnode *vp = (struct vnode *)context;
717 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
727 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
729 struct mqfs_vdata *vd;
730 struct mqfs_info *mqfs;
731 struct vnode *newvpp;
736 sx_xlock(&mqfs->mi_lock);
737 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
738 if (vd->mv_vnode->v_mount == mp) {
747 sx_xunlock(&mqfs->mi_lock);
748 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
752 sx_xunlock(&mqfs->mi_lock);
754 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
757 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
758 error = insmntque(newvpp, mp);
762 sx_xlock(&mqfs->mi_lock);
764 * Check if it has already been allocated
765 * while we were blocked.
767 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
768 if (vd->mv_vnode->v_mount == mp) {
770 sx_xunlock(&mqfs->mi_lock);
780 vd = uma_zalloc(mvdata_zone, M_WAITOK);
784 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
785 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
787 switch (pn->mn_type) {
789 (*vpp)->v_vflag = VV_ROOT;
793 case mqfstype_parent:
794 (*vpp)->v_type = VDIR;
797 (*vpp)->v_type = VREG;
799 case mqfstype_symlink:
800 (*vpp)->v_type = VLNK;
803 KASSERT(0, ("mqfs_allocf called for null node\n"));
805 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
807 sx_xunlock(&mqfs->mi_lock);
812 * Search a directory entry
814 static struct mqfs_node *
815 mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred)
817 struct mqfs_node *pn;
820 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
821 pr_root = cred->cr_prison->pr_root;
822 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
823 /* Only match names within the same prison root directory */
824 if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) &&
825 strncmp(pn->mn_name, name, len) == 0 &&
826 pn->mn_name[len] == '\0')
833 * Look up a file or directory.
836 mqfs_lookupx(struct vop_cachedlookup_args *ap)
838 struct componentname *cnp;
839 struct vnode *dvp, **vpp;
840 struct mqfs_node *pd;
841 struct mqfs_node *pn;
842 struct mqfs_info *mqfs;
843 int nameiop, flags, error, namelen;
850 pname = cnp->cn_nameptr;
851 namelen = cnp->cn_namelen;
853 flags = cnp->cn_flags;
854 nameiop = cnp->cn_nameiop;
860 if (dvp->v_type != VDIR)
863 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
867 /* shortcut: check if the name is too long */
868 if (cnp->cn_namelen >= MQFS_NAMELEN)
872 if (namelen == 1 && pname[0] == '.') {
873 if ((flags & ISLASTCN) && nameiop != LOOKUP)
882 if (cnp->cn_flags & ISDOTDOT) {
883 if (dvp->v_vflag & VV_ROOT)
885 if ((flags & ISLASTCN) && nameiop != LOOKUP)
888 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
890 error = mqfs_allocv(dvp->v_mount, vpp, pn);
891 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
896 sx_xlock(&mqfs->mi_lock);
897 pn = mqfs_search(pd, pname, namelen, cnp->cn_cred);
900 sx_xunlock(&mqfs->mi_lock);
905 if (nameiop == DELETE && (flags & ISLASTCN)) {
906 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
920 error = mqfs_allocv(dvp->v_mount, vpp, pn);
922 if (error == 0 && cnp->cn_flags & MAKEENTRY)
923 cache_enter(dvp, *vpp, cnp);
929 /* will create a new entry in the directory ? */
930 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
931 && (flags & ISLASTCN)) {
932 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
935 cnp->cn_flags |= SAVENAME;
936 return (EJUSTRETURN);
942 struct vop_lookup_args {
943 struct vop_generic_args a_gen;
945 struct vnode **a_vpp;
946 struct componentname *a_cnp;
951 * vnode lookup operation
954 mqfs_lookup(struct vop_cachedlookup_args *ap)
958 rc = mqfs_lookupx(ap);
963 struct vop_create_args {
965 struct vnode **a_vpp;
966 struct componentname *a_cnp;
972 * vnode creation operation
975 mqfs_create(struct vop_create_args *ap)
977 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
978 struct componentname *cnp = ap->a_cnp;
979 struct mqfs_node *pd;
980 struct mqfs_node *pn;
984 pd = VTON(ap->a_dvp);
985 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
987 mq = mqueue_alloc(NULL);
990 sx_xlock(&mqfs->mi_lock);
991 if ((cnp->cn_flags & HASBUF) == 0)
992 panic("%s: no name", __func__);
993 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
994 cnp->cn_cred, ap->a_vap->va_mode);
996 sx_xunlock(&mqfs->mi_lock);
1000 sx_xunlock(&mqfs->mi_lock);
1001 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1017 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
1019 struct mqfs_node *parent;
1020 struct mqfs_vdata *vd;
1023 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1025 if (ucred->cr_uid != pn->mn_uid &&
1026 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1028 else if (!pn->mn_deleted) {
1029 parent = pn->mn_parent;
1030 pn->mn_parent = NULL;
1032 LIST_REMOVE(pn, mn_sibling);
1033 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1034 cache_purge(vd->mv_vnode);
1035 vhold(vd->mv_vnode);
1036 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1039 mqnode_release(parent);
1046 struct vop_remove_args {
1047 struct vnode *a_dvp;
1049 struct componentname *a_cnp;
1054 * vnode removal operation
1057 mqfs_remove(struct vop_remove_args *ap)
1059 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1060 struct mqfs_node *pn;
1063 if (ap->a_vp->v_type == VDIR)
1065 pn = VTON(ap->a_vp);
1066 sx_xlock(&mqfs->mi_lock);
1067 error = do_unlink(pn, ap->a_cnp->cn_cred);
1068 sx_xunlock(&mqfs->mi_lock);
1073 struct vop_inactive_args {
1075 struct thread *a_td;
1080 mqfs_inactive(struct vop_inactive_args *ap)
1082 struct mqfs_node *pn = VTON(ap->a_vp);
1090 struct vop_reclaim_args {
1091 struct vop_generic_args a_gen;
1093 struct thread *a_td;
1098 mqfs_reclaim(struct vop_reclaim_args *ap)
1100 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1101 struct vnode *vp = ap->a_vp;
1102 struct mqfs_node *pn;
1103 struct mqfs_vdata *vd;
1107 sx_xlock(&mqfs->mi_lock);
1109 LIST_REMOVE(vd, mv_link);
1110 uma_zfree(mvdata_zone, vd);
1112 sx_xunlock(&mqfs->mi_lock);
1117 struct vop_open_args {
1118 struct vop_generic_args a_gen;
1121 struct ucred *a_cred;
1122 struct thread *a_td;
1128 mqfs_open(struct vop_open_args *ap)
1134 struct vop_close_args {
1135 struct vop_generic_args a_gen;
1138 struct ucred *a_cred;
1139 struct thread *a_td;
1144 mqfs_close(struct vop_close_args *ap)
1150 struct vop_access_args {
1151 struct vop_generic_args a_gen;
1153 accmode_t a_accmode;
1154 struct ucred *a_cred;
1155 struct thread *a_td;
1160 * Verify permissions
1163 mqfs_access(struct vop_access_args *ap)
1165 struct vnode *vp = ap->a_vp;
1169 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1172 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1173 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1178 struct vop_getattr_args {
1179 struct vop_generic_args a_gen;
1181 struct vattr *a_vap;
1182 struct ucred *a_cred;
1187 * Get file attributes
1190 mqfs_getattr(struct vop_getattr_args *ap)
1192 struct vnode *vp = ap->a_vp;
1193 struct mqfs_node *pn = VTON(vp);
1194 struct vattr *vap = ap->a_vap;
1197 vap->va_type = vp->v_type;
1198 vap->va_mode = pn->mn_mode;
1200 vap->va_uid = pn->mn_uid;
1201 vap->va_gid = pn->mn_gid;
1202 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1203 vap->va_fileid = pn->mn_fileno;
1205 vap->va_blocksize = PAGE_SIZE;
1206 vap->va_bytes = vap->va_size = 0;
1207 vap->va_atime = pn->mn_atime;
1208 vap->va_mtime = pn->mn_mtime;
1209 vap->va_ctime = pn->mn_ctime;
1210 vap->va_birthtime = pn->mn_birth;
1213 vap->va_rdev = NODEV;
1215 vap->va_filerev = 0;
1220 struct vop_setattr_args {
1221 struct vop_generic_args a_gen;
1223 struct vattr *a_vap;
1224 struct ucred *a_cred;
1231 mqfs_setattr(struct vop_setattr_args *ap)
1233 struct mqfs_node *pn;
1244 if ((vap->va_type != VNON) ||
1245 (vap->va_nlink != VNOVAL) ||
1246 (vap->va_fsid != VNOVAL) ||
1247 (vap->va_fileid != VNOVAL) ||
1248 (vap->va_blocksize != VNOVAL) ||
1249 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1250 (vap->va_rdev != VNOVAL) ||
1251 ((int)vap->va_bytes != VNOVAL) ||
1252 (vap->va_gen != VNOVAL)) {
1259 if (vap->va_uid == (uid_t)VNOVAL)
1263 if (vap->va_gid == (gid_t)VNOVAL)
1268 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1270 * To modify the ownership of a file, must possess VADMIN
1273 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1277 * XXXRW: Why is there a privilege check here: shouldn't the
1278 * check in VOP_ACCESS() be enough? Also, are the group bits
1279 * below definitely right?
1281 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1282 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1283 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1290 if (vap->va_mode != (mode_t)VNOVAL) {
1291 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1292 (error = priv_check(td, PRIV_MQ_ADMIN)))
1294 pn->mn_mode = vap->va_mode;
1298 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1299 /* See the comment in ufs_vnops::ufs_setattr(). */
1300 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1301 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1302 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1304 if (vap->va_atime.tv_sec != VNOVAL) {
1305 pn->mn_atime = vap->va_atime;
1307 if (vap->va_mtime.tv_sec != VNOVAL) {
1308 pn->mn_mtime = vap->va_mtime;
1313 vfs_timestamp(&pn->mn_ctime);
1319 struct vop_read_args {
1320 struct vop_generic_args a_gen;
1324 struct ucred *a_cred;
1332 mqfs_read(struct vop_read_args *ap)
1335 struct vnode *vp = ap->a_vp;
1336 struct uio *uio = ap->a_uio;
1337 struct mqfs_node *pn;
1341 if (vp->v_type != VREG)
1346 snprintf(buf, sizeof(buf),
1347 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1352 buf[sizeof(buf)-1] = '\0';
1354 error = uiomove_frombuf(buf, len, uio);
1359 struct vop_readdir_args {
1360 struct vop_generic_args a_gen;
1363 struct ucred *a_cred;
1371 * Return directory entries.
1374 mqfs_readdir(struct vop_readdir_args *ap)
1377 struct mqfs_info *mi;
1378 struct mqfs_node *pd;
1379 struct mqfs_node *pn;
1380 struct dirent entry;
1382 const void *pr_root;
1383 int *tmp_ncookies = NULL;
1388 mi = VFSTOMQFS(vp->v_mount);
1392 if (vp->v_type != VDIR)
1395 if (uio->uio_offset < 0)
1398 if (ap->a_ncookies != NULL) {
1399 tmp_ncookies = ap->a_ncookies;
1400 *ap->a_ncookies = 0;
1401 ap->a_ncookies = NULL;
1407 pr_root = ap->a_cred->cr_prison->pr_root;
1408 sx_xlock(&mi->mi_lock);
1410 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1411 entry.d_reclen = sizeof(entry);
1414 * Only show names within the same prison root directory
1415 * (or not associated with a prison, e.g. "." and "..").
1417 if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root)
1420 mqfs_fileno_alloc(mi, pn);
1421 entry.d_fileno = pn->mn_fileno;
1422 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1423 entry.d_name[i] = pn->mn_name[i];
1424 entry.d_name[i] = 0;
1426 switch (pn->mn_type) {
1430 case mqfstype_parent:
1431 entry.d_type = DT_DIR;
1434 entry.d_type = DT_REG;
1436 case mqfstype_symlink:
1437 entry.d_type = DT_LNK;
1440 panic("%s has unexpected node type: %d", pn->mn_name,
1443 if (entry.d_reclen > uio->uio_resid)
1445 if (offset >= uio->uio_offset) {
1446 error = vfs_read_dirent(ap, &entry, offset);
1450 offset += entry.d_reclen;
1452 sx_xunlock(&mi->mi_lock);
1454 uio->uio_offset = offset;
1456 if (tmp_ncookies != NULL)
1457 ap->a_ncookies = tmp_ncookies;
1465 struct vop_mkdir_args {
1466 struct vnode *a_dvp;
1467 struvt vnode **a_vpp;
1468 struvt componentname *a_cnp;
1469 struct vattr *a_vap;
1474 * Create a directory.
1477 mqfs_mkdir(struct vop_mkdir_args *ap)
1479 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1480 struct componentname *cnp = ap->a_cnp;
1481 struct mqfs_node *pd = VTON(ap->a_dvp);
1482 struct mqfs_node *pn;
1485 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1487 sx_xlock(&mqfs->mi_lock);
1488 if ((cnp->cn_flags & HASBUF) == 0)
1489 panic("%s: no name", __func__);
1490 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1491 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1494 sx_xunlock(&mqfs->mi_lock);
1498 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1505 struct vop_rmdir_args {
1506 struct vnode *a_dvp;
1508 struct componentname *a_cnp;
1513 * Remove a directory.
1516 mqfs_rmdir(struct vop_rmdir_args *ap)
1518 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1519 struct mqfs_node *pn = VTON(ap->a_vp);
1520 struct mqfs_node *pt;
1522 if (pn->mn_type != mqfstype_dir)
1525 sx_xlock(&mqfs->mi_lock);
1526 if (pn->mn_deleted) {
1527 sx_xunlock(&mqfs->mi_lock);
1531 pt = LIST_FIRST(&pn->mn_children);
1532 pt = LIST_NEXT(pt, mn_sibling);
1533 pt = LIST_NEXT(pt, mn_sibling);
1535 sx_xunlock(&mqfs->mi_lock);
1539 pn->mn_parent = NULL;
1541 LIST_REMOVE(pn, mn_sibling);
1544 sx_xunlock(&mqfs->mi_lock);
1545 cache_purge(ap->a_vp);
1552 * See if this prison root is obsolete, and clean up associated queues if it is.
1555 mqfs_prison_remove(void *obj, void *data __unused)
1557 const struct prison *pr = obj;
1558 const struct prison *tpr;
1559 struct mqfs_node *pn, *tpn;
1563 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1564 if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0)
1569 * No jails are rooted in this directory anymore,
1570 * so no queues should be either.
1572 sx_xlock(&mqfs_data.mi_lock);
1573 LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children,
1575 if (pn->mn_pr_root == pr->pr_root)
1576 (void)do_unlink(pn, curthread->td_ucred);
1578 sx_xunlock(&mqfs_data.mi_lock);
1584 * Allocate a message queue
1586 static struct mqueue *
1587 mqueue_alloc(const struct mq_attr *attr)
1593 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1594 TAILQ_INIT(&mq->mq_msgq);
1596 mq->mq_maxmsg = attr->mq_maxmsg;
1597 mq->mq_msgsize = attr->mq_msgsize;
1599 mq->mq_maxmsg = default_maxmsg;
1600 mq->mq_msgsize = default_msgsize;
1602 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1603 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1604 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1605 atomic_add_int(&curmq, 1);
1610 * Destroy a message queue
1613 mqueue_free(struct mqueue *mq)
1615 struct mqueue_msg *msg;
1617 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1618 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1619 free(msg, M_MQUEUEDATA);
1622 mtx_destroy(&mq->mq_mutex);
1623 seldrain(&mq->mq_rsel);
1624 seldrain(&mq->mq_wsel);
1625 knlist_destroy(&mq->mq_rsel.si_note);
1626 knlist_destroy(&mq->mq_wsel.si_note);
1627 uma_zfree(mqueue_zone, mq);
1628 atomic_add_int(&curmq, -1);
1632 * Load a message from user space
1634 static struct mqueue_msg *
1635 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1637 struct mqueue_msg *msg;
1641 len = sizeof(struct mqueue_msg) + msg_size;
1642 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1643 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1646 free(msg, M_MQUEUEDATA);
1649 msg->msg_size = msg_size;
1650 msg->msg_prio = msg_prio;
1656 * Save a message to user space
1659 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1663 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1665 if (error == 0 && msg_prio != NULL)
1666 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1671 * Free a message's memory
1673 static __inline void
1674 mqueue_freemsg(struct mqueue_msg *msg)
1676 free(msg, M_MQUEUEDATA);
1680 * Send a message. if waitok is false, thread will not be
1681 * blocked if there is no data in queue, otherwise, absolute
1682 * time will be checked.
1685 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1686 size_t msg_len, unsigned msg_prio, int waitok,
1687 const struct timespec *abs_timeout)
1689 struct mqueue_msg *msg;
1690 struct timespec ts, ts2;
1694 if (msg_prio >= MQ_PRIO_MAX)
1696 if (msg_len > mq->mq_msgsize)
1698 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1702 /* O_NONBLOCK case */
1704 error = _mqueue_send(mq, msg, -1);
1710 /* we allow a null timeout (wait forever) */
1711 if (abs_timeout == NULL) {
1712 error = _mqueue_send(mq, msg, 0);
1718 /* send it before checking time */
1719 error = _mqueue_send(mq, msg, -1);
1723 if (error != EAGAIN)
1726 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1733 timespecsub(&ts2, &ts);
1734 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1738 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1739 error = _mqueue_send(mq, msg, tvtohz(&tv));
1740 if (error != ETIMEDOUT)
1746 mqueue_freemsg(msg);
1751 * Common routine to send a message
1754 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1756 struct mqueue_msg *msg2;
1759 mtx_lock(&mq->mq_mutex);
1760 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1762 mtx_unlock(&mq->mq_mutex);
1766 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1767 PCATCH, "mqsend", timo);
1769 if (error == EAGAIN)
1772 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1773 mtx_unlock(&mq->mq_mutex);
1777 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1778 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1780 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1781 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1783 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1784 if (msg2->msg_prio < msg->msg_prio)
1787 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1791 mq->mq_totalbytes += msg->msg_size;
1792 if (mq->mq_receivers)
1793 wakeup_one(&mq->mq_receivers);
1794 else if (mq->mq_notifier != NULL)
1795 mqueue_send_notification(mq);
1796 if (mq->mq_flags & MQ_RSEL) {
1797 mq->mq_flags &= ~MQ_RSEL;
1798 selwakeup(&mq->mq_rsel);
1800 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1801 mtx_unlock(&mq->mq_mutex);
1806 * Send realtime a signal to process which registered itself
1807 * successfully by mq_notify.
1810 mqueue_send_notification(struct mqueue *mq)
1812 struct mqueue_notifier *nt;
1817 mtx_assert(&mq->mq_mutex, MA_OWNED);
1818 nt = mq->mq_notifier;
1819 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1821 error = sigev_findtd(p, &nt->nt_sigev, &td);
1823 mq->mq_notifier = NULL;
1826 if (!KSI_ONQ(&nt->nt_ksi)) {
1827 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1828 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1832 mq->mq_notifier = NULL;
1836 * Get a message. if waitok is false, thread will not be
1837 * blocked if there is no data in queue, otherwise, absolute
1838 * time will be checked.
1841 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1842 size_t msg_len, unsigned *msg_prio, int waitok,
1843 const struct timespec *abs_timeout)
1845 struct mqueue_msg *msg;
1846 struct timespec ts, ts2;
1850 if (msg_len < mq->mq_msgsize)
1853 /* O_NONBLOCK case */
1855 error = _mqueue_recv(mq, &msg, -1);
1861 /* we allow a null timeout (wait forever). */
1862 if (abs_timeout == NULL) {
1863 error = _mqueue_recv(mq, &msg, 0);
1869 /* try to get a message before checking time */
1870 error = _mqueue_recv(mq, &msg, -1);
1874 if (error != EAGAIN)
1877 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1885 timespecsub(&ts2, &ts);
1886 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1890 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1891 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1894 if (error != ETIMEDOUT)
1899 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1901 curthread->td_retval[0] = msg->msg_size;
1902 curthread->td_retval[1] = 0;
1904 mqueue_freemsg(msg);
1909 * Common routine to receive a message
1912 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1916 mtx_lock(&mq->mq_mutex);
1917 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1919 mtx_unlock(&mq->mq_mutex);
1923 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1924 PCATCH, "mqrecv", timo);
1926 if (error == EAGAIN)
1931 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1933 mq->mq_totalbytes -= (*msg)->msg_size;
1935 wakeup_one(&mq->mq_senders);
1936 if (mq->mq_flags & MQ_WSEL) {
1937 mq->mq_flags &= ~MQ_WSEL;
1938 selwakeup(&mq->mq_wsel);
1940 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1942 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1943 !TAILQ_EMPTY(&mq->mq_msgq)) {
1944 mqueue_send_notification(mq);
1946 mtx_unlock(&mq->mq_mutex);
1950 static __inline struct mqueue_notifier *
1951 notifier_alloc(void)
1953 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1956 static __inline void
1957 notifier_free(struct mqueue_notifier *p)
1959 uma_zfree(mqnoti_zone, p);
1962 static struct mqueue_notifier *
1963 notifier_search(struct proc *p, int fd)
1965 struct mqueue_notifier *nt;
1967 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1968 if (nt->nt_ksi.ksi_mqd == fd)
1974 static __inline void
1975 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1977 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1980 static __inline void
1981 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1983 LIST_REMOVE(nt, nt_link);
1988 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1990 struct mqueue_notifier *nt;
1992 mtx_assert(&mq->mq_mutex, MA_OWNED);
1994 nt = notifier_search(p, fd);
1996 if (mq->mq_notifier == nt)
1997 mq->mq_notifier = NULL;
1998 sigqueue_take(&nt->nt_ksi);
1999 notifier_delete(p, nt);
2005 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
2006 const struct mq_attr *attr)
2008 char path[MQFS_NAMELEN + 1];
2009 struct mqfs_node *pn;
2010 struct filedesc *fdp;
2013 int fd, error, len, cmode;
2015 fdp = td->td_proc->p_fd;
2016 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
2018 if ((flags & O_CREAT) != 0 && attr != NULL) {
2019 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
2021 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
2025 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
2030 * The first character of name must be a slash (/) character
2031 * and the remaining characters of name cannot include any slash
2035 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2038 error = falloc(td, &fp, &fd, O_CLOEXEC);
2042 sx_xlock(&mqfs_data.mi_lock);
2043 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2045 if (!(flags & O_CREAT)) {
2048 mq = mqueue_alloc(attr);
2052 pn = mqfs_create_file(mqfs_data.mi_root,
2053 path + 1, len - 1, td->td_ucred,
2066 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2069 accmode_t accmode = 0;
2075 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2076 pn->mn_gid, accmode, td->td_ucred, NULL);
2081 sx_xunlock(&mqfs_data.mi_lock);
2082 fdclose(td, fp, fd);
2088 sx_xunlock(&mqfs_data.mi_lock);
2090 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2093 td->td_retval[0] = fd;
2099 * Syscall to open a message queue.
2102 sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
2104 struct mq_attr attr;
2107 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2109 flags = FFLAGS(uap->flags);
2110 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2111 error = copyin(uap->attr, &attr, sizeof(attr));
2115 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2116 uap->attr != NULL ? &attr : NULL));
2120 * Syscall to unlink a message queue.
2123 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2125 char path[MQFS_NAMELEN+1];
2126 struct mqfs_node *pn;
2129 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2134 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2137 sx_xlock(&mqfs_data.mi_lock);
2138 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2140 error = do_unlink(pn, td->td_ucred);
2143 sx_xunlock(&mqfs_data.mi_lock);
2147 typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **);
2150 * Get message queue by giving file slot
2153 _getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func,
2154 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2156 struct mqfs_node *pn;
2159 error = func(td, fd, rightsp, fpp);
2162 if (&mqueueops != (*fpp)->f_ops) {
2166 pn = (*fpp)->f_data;
2175 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2176 struct mqueue **pmq)
2178 cap_rights_t rights;
2180 return _getmq(td, fd, cap_rights_init(&rights, CAP_EVENT), fget,
2185 getmq_read(struct thread *td, int fd, struct file **fpp,
2186 struct mqfs_node **ppn, struct mqueue **pmq)
2188 cap_rights_t rights;
2190 return _getmq(td, fd, cap_rights_init(&rights, CAP_READ), fget_read,
2195 getmq_write(struct thread *td, int fd, struct file **fpp,
2196 struct mqfs_node **ppn, struct mqueue **pmq)
2198 cap_rights_t rights;
2200 return _getmq(td, fd, cap_rights_init(&rights, CAP_WRITE), fget_write,
2205 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2206 struct mq_attr *oattr)
2213 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2215 error = getmq(td, mqd, &fp, NULL, &mq);
2218 oattr->mq_maxmsg = mq->mq_maxmsg;
2219 oattr->mq_msgsize = mq->mq_msgsize;
2220 oattr->mq_curmsgs = mq->mq_curmsgs;
2223 oflag = flag = fp->f_flag;
2224 flag &= ~O_NONBLOCK;
2225 flag |= (attr->mq_flags & O_NONBLOCK);
2226 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2229 oattr->mq_flags = (O_NONBLOCK & oflag);
2235 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2237 struct mq_attr attr, oattr;
2240 if (uap->attr != NULL) {
2241 error = copyin(uap->attr, &attr, sizeof(attr));
2245 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2247 if (error == 0 && uap->oattr != NULL) {
2248 bzero(oattr.__reserved, sizeof(oattr.__reserved));
2249 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2255 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2259 struct timespec *abs_timeout, ets;
2263 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2266 if (uap->abs_timeout != NULL) {
2267 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2273 waitok = !(fp->f_flag & O_NONBLOCK);
2274 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2275 uap->msg_prio, waitok, abs_timeout);
2281 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2285 struct timespec *abs_timeout, ets;
2288 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2291 if (uap->abs_timeout != NULL) {
2292 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2298 waitok = !(fp->f_flag & O_NONBLOCK);
2299 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2300 uap->msg_prio, waitok, abs_timeout);
2306 kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
2309 cap_rights_t rights;
2311 struct filedesc *fdp;
2314 struct file *fp, *fp2;
2315 struct mqueue_notifier *nt, *newnt = NULL;
2318 if (sigev != NULL) {
2319 if (sigev->sigev_notify != SIGEV_SIGNAL &&
2320 sigev->sigev_notify != SIGEV_THREAD_ID &&
2321 sigev->sigev_notify != SIGEV_NONE)
2323 if ((sigev->sigev_notify == SIGEV_SIGNAL ||
2324 sigev->sigev_notify == SIGEV_THREAD_ID) &&
2325 !_SIG_VALID(sigev->sigev_signo))
2329 fdp = td->td_proc->p_fd;
2330 error = getmq(td, mqd, &fp, NULL, &mq);
2334 FILEDESC_SLOCK(fdp);
2335 fp2 = fget_locked(fdp, mqd);
2337 FILEDESC_SUNLOCK(fdp);
2342 error = cap_check(cap_rights(fdp, mqd),
2343 cap_rights_init(&rights, CAP_EVENT));
2345 FILEDESC_SUNLOCK(fdp);
2350 FILEDESC_SUNLOCK(fdp);
2354 mtx_lock(&mq->mq_mutex);
2355 FILEDESC_SUNLOCK(fdp);
2356 if (sigev != NULL) {
2357 if (mq->mq_notifier != NULL) {
2361 nt = notifier_search(p, mqd);
2363 if (newnt == NULL) {
2365 mtx_unlock(&mq->mq_mutex);
2366 newnt = notifier_alloc();
2372 sigqueue_take(&nt->nt_ksi);
2373 if (newnt != NULL) {
2374 notifier_free(newnt);
2380 ksiginfo_init(&nt->nt_ksi);
2381 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2382 nt->nt_ksi.ksi_code = SI_MESGQ;
2384 nt->nt_ksi.ksi_mqd = mqd;
2385 notifier_insert(p, nt);
2387 nt->nt_sigev = *sigev;
2388 mq->mq_notifier = nt;
2391 * if there is no receivers and message queue
2392 * is not empty, we should send notification
2393 * as soon as possible.
2395 if (mq->mq_receivers == 0 &&
2396 !TAILQ_EMPTY(&mq->mq_msgq))
2397 mqueue_send_notification(mq);
2400 notifier_remove(p, mq, mqd);
2402 mtx_unlock(&mq->mq_mutex);
2407 notifier_free(newnt);
2412 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2414 struct sigevent ev, *evp;
2417 if (uap->sigev == NULL) {
2420 error = copyin(uap->sigev, &ev, sizeof(ev));
2425 return (kern_kmq_notify(td, uap->mqd, evp));
2429 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2431 struct filedesc *fdp;
2434 fdp = td->td_proc->p_fd;
2435 FILEDESC_LOCK_ASSERT(fdp);
2437 if (fp->f_ops == &mqueueops) {
2439 mtx_lock(&mq->mq_mutex);
2440 notifier_remove(td->td_proc, mq, fd);
2442 /* have to wakeup thread in same process */
2443 if (mq->mq_flags & MQ_RSEL) {
2444 mq->mq_flags &= ~MQ_RSEL;
2445 selwakeup(&mq->mq_rsel);
2447 if (mq->mq_flags & MQ_WSEL) {
2448 mq->mq_flags &= ~MQ_WSEL;
2449 selwakeup(&mq->mq_wsel);
2451 mtx_unlock(&mq->mq_mutex);
2456 mq_proc_exit(void *arg __unused, struct proc *p)
2458 struct filedesc *fdp;
2464 FILEDESC_SLOCK(fdp);
2465 for (i = 0; i < fdp->fd_nfiles; ++i) {
2466 fp = fget_locked(fdp, i);
2467 if (fp != NULL && fp->f_ops == &mqueueops) {
2469 mtx_lock(&mq->mq_mutex);
2470 notifier_remove(p, FPTOMQ(fp), i);
2471 mtx_unlock(&mq->mq_mutex);
2474 FILEDESC_SUNLOCK(fdp);
2475 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2479 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2482 struct mqueue *mq = FPTOMQ(fp);
2485 mtx_lock(&mq->mq_mutex);
2486 if (events & (POLLIN | POLLRDNORM)) {
2487 if (mq->mq_curmsgs) {
2488 revents |= events & (POLLIN | POLLRDNORM);
2490 mq->mq_flags |= MQ_RSEL;
2491 selrecord(td, &mq->mq_rsel);
2494 if (events & POLLOUT) {
2495 if (mq->mq_curmsgs < mq->mq_maxmsg)
2498 mq->mq_flags |= MQ_WSEL;
2499 selrecord(td, &mq->mq_wsel);
2502 mtx_unlock(&mq->mq_mutex);
2507 mqf_close(struct file *fp, struct thread *td)
2509 struct mqfs_node *pn;
2511 fp->f_ops = &badfileops;
2514 sx_xlock(&mqfs_data.mi_lock);
2516 sx_xunlock(&mqfs_data.mi_lock);
2521 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2524 struct mqfs_node *pn = fp->f_data;
2526 bzero(st, sizeof *st);
2527 sx_xlock(&mqfs_data.mi_lock);
2528 st->st_atim = pn->mn_atime;
2529 st->st_mtim = pn->mn_mtime;
2530 st->st_ctim = pn->mn_ctime;
2531 st->st_birthtim = pn->mn_birth;
2532 st->st_uid = pn->mn_uid;
2533 st->st_gid = pn->mn_gid;
2534 st->st_mode = S_IFIFO | pn->mn_mode;
2535 sx_xunlock(&mqfs_data.mi_lock);
2540 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2543 struct mqfs_node *pn;
2548 sx_xlock(&mqfs_data.mi_lock);
2549 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
2553 pn->mn_mode = mode & ACCESSPERMS;
2555 sx_xunlock(&mqfs_data.mi_lock);
2560 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2563 struct mqfs_node *pn;
2568 sx_xlock(&mqfs_data.mi_lock);
2569 if (uid == (uid_t)-1)
2571 if (gid == (gid_t)-1)
2573 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
2574 (gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
2575 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
2580 sx_xunlock(&mqfs_data.mi_lock);
2585 mqf_kqfilter(struct file *fp, struct knote *kn)
2587 struct mqueue *mq = FPTOMQ(fp);
2590 if (kn->kn_filter == EVFILT_READ) {
2591 kn->kn_fop = &mq_rfiltops;
2592 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2593 } else if (kn->kn_filter == EVFILT_WRITE) {
2594 kn->kn_fop = &mq_wfiltops;
2595 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2602 filt_mqdetach(struct knote *kn)
2604 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2606 if (kn->kn_filter == EVFILT_READ)
2607 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2608 else if (kn->kn_filter == EVFILT_WRITE)
2609 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2611 panic("filt_mqdetach");
2615 filt_mqread(struct knote *kn, long hint)
2617 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2619 mtx_assert(&mq->mq_mutex, MA_OWNED);
2620 return (mq->mq_curmsgs != 0);
2624 filt_mqwrite(struct knote *kn, long hint)
2626 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2628 mtx_assert(&mq->mq_mutex, MA_OWNED);
2629 return (mq->mq_curmsgs < mq->mq_maxmsg);
2633 mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
2636 kif->kf_type = KF_TYPE_MQUEUE;
2640 static struct fileops mqueueops = {
2641 .fo_read = invfo_rdwr,
2642 .fo_write = invfo_rdwr,
2643 .fo_truncate = invfo_truncate,
2644 .fo_ioctl = invfo_ioctl,
2645 .fo_poll = mqf_poll,
2646 .fo_kqfilter = mqf_kqfilter,
2647 .fo_stat = mqf_stat,
2648 .fo_close = mqf_close,
2649 .fo_chmod = mqf_chmod,
2650 .fo_chown = mqf_chown,
2651 .fo_sendfile = invfo_sendfile,
2652 .fo_fill_kinfo = mqf_fill_kinfo,
2655 static struct vop_vector mqfs_vnodeops = {
2656 .vop_default = &default_vnodeops,
2657 .vop_access = mqfs_access,
2658 .vop_cachedlookup = mqfs_lookup,
2659 .vop_lookup = vfs_cache_lookup,
2660 .vop_reclaim = mqfs_reclaim,
2661 .vop_create = mqfs_create,
2662 .vop_remove = mqfs_remove,
2663 .vop_inactive = mqfs_inactive,
2664 .vop_open = mqfs_open,
2665 .vop_close = mqfs_close,
2666 .vop_getattr = mqfs_getattr,
2667 .vop_setattr = mqfs_setattr,
2668 .vop_read = mqfs_read,
2669 .vop_write = VOP_EOPNOTSUPP,
2670 .vop_readdir = mqfs_readdir,
2671 .vop_mkdir = VOP_EOPNOTSUPP,
2672 .vop_rmdir = VOP_EOPNOTSUPP
2675 static struct vfsops mqfs_vfsops = {
2676 .vfs_init = mqfs_init,
2677 .vfs_uninit = mqfs_uninit,
2678 .vfs_mount = mqfs_mount,
2679 .vfs_unmount = mqfs_unmount,
2680 .vfs_root = mqfs_root,
2681 .vfs_statfs = mqfs_statfs,
2684 static struct vfsconf mqueuefs_vfsconf = {
2685 .vfc_version = VFS_VERSION,
2686 .vfc_name = "mqueuefs",
2687 .vfc_vfsops = &mqfs_vfsops,
2689 .vfc_flags = VFCF_SYNTHETIC
2692 static struct syscall_helper_data mq_syscalls[] = {
2693 SYSCALL_INIT_HELPER(kmq_open),
2694 SYSCALL_INIT_HELPER(kmq_setattr),
2695 SYSCALL_INIT_HELPER(kmq_timedsend),
2696 SYSCALL_INIT_HELPER(kmq_timedreceive),
2697 SYSCALL_INIT_HELPER(kmq_notify),
2698 SYSCALL_INIT_HELPER(kmq_unlink),
2702 #ifdef COMPAT_FREEBSD32
2703 #include <compat/freebsd32/freebsd32.h>
2704 #include <compat/freebsd32/freebsd32_proto.h>
2705 #include <compat/freebsd32/freebsd32_signal.h>
2706 #include <compat/freebsd32/freebsd32_syscall.h>
2707 #include <compat/freebsd32/freebsd32_util.h>
2710 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2713 to->mq_flags = from->mq_flags;
2714 to->mq_maxmsg = from->mq_maxmsg;
2715 to->mq_msgsize = from->mq_msgsize;
2716 to->mq_curmsgs = from->mq_curmsgs;
2720 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2723 to->mq_flags = from->mq_flags;
2724 to->mq_maxmsg = from->mq_maxmsg;
2725 to->mq_msgsize = from->mq_msgsize;
2726 to->mq_curmsgs = from->mq_curmsgs;
2730 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
2732 struct mq_attr attr;
2733 struct mq_attr32 attr32;
2736 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2738 flags = FFLAGS(uap->flags);
2739 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2740 error = copyin(uap->attr, &attr32, sizeof(attr32));
2743 mq_attr_from32(&attr32, &attr);
2745 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2746 uap->attr != NULL ? &attr : NULL));
2750 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
2752 struct mq_attr attr, oattr;
2753 struct mq_attr32 attr32, oattr32;
2756 if (uap->attr != NULL) {
2757 error = copyin(uap->attr, &attr32, sizeof(attr32));
2760 mq_attr_from32(&attr32, &attr);
2762 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2764 if (error == 0 && uap->oattr != NULL) {
2765 mq_attr_to32(&oattr, &oattr32);
2766 bzero(oattr32.__reserved, sizeof(oattr32.__reserved));
2767 error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2773 freebsd32_kmq_timedsend(struct thread *td,
2774 struct freebsd32_kmq_timedsend_args *uap)
2778 struct timespec32 ets32;
2779 struct timespec *abs_timeout, ets;
2783 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2786 if (uap->abs_timeout != NULL) {
2787 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2790 CP(ets32, ets, tv_sec);
2791 CP(ets32, ets, tv_nsec);
2795 waitok = !(fp->f_flag & O_NONBLOCK);
2796 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2797 uap->msg_prio, waitok, abs_timeout);
2803 freebsd32_kmq_timedreceive(struct thread *td,
2804 struct freebsd32_kmq_timedreceive_args *uap)
2808 struct timespec32 ets32;
2809 struct timespec *abs_timeout, ets;
2812 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2815 if (uap->abs_timeout != NULL) {
2816 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2819 CP(ets32, ets, tv_sec);
2820 CP(ets32, ets, tv_nsec);
2824 waitok = !(fp->f_flag & O_NONBLOCK);
2825 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2826 uap->msg_prio, waitok, abs_timeout);
2832 freebsd32_kmq_notify(struct thread *td, struct freebsd32_kmq_notify_args *uap)
2834 struct sigevent ev, *evp;
2835 struct sigevent32 ev32;
2838 if (uap->sigev == NULL) {
2841 error = copyin(uap->sigev, &ev32, sizeof(ev32));
2844 error = convert_sigevent32(&ev32, &ev);
2849 return (kern_kmq_notify(td, uap->mqd, evp));
2852 static struct syscall_helper_data mq32_syscalls[] = {
2853 SYSCALL32_INIT_HELPER(freebsd32_kmq_open),
2854 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr),
2855 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend),
2856 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive),
2857 SYSCALL32_INIT_HELPER(freebsd32_kmq_notify),
2858 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink),
2868 error = syscall_helper_register(mq_syscalls, SY_THR_STATIC_KLD);
2871 #ifdef COMPAT_FREEBSD32
2872 error = syscall32_helper_register(mq32_syscalls, SY_THR_STATIC_KLD);
2883 #ifdef COMPAT_FREEBSD32
2884 syscall32_helper_unregister(mq32_syscalls);
2886 syscall_helper_unregister(mq_syscalls);
2891 mq_modload(struct module *module, int cmd, void *arg)
2895 error = vfs_modevent(module, cmd, arg);
2914 static moduledata_t mqueuefs_mod = {
2919 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
2920 MODULE_VERSION(mqueuefs, 1);