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>
85 #include <sys/vnode.h>
86 #include <machine/atomic.h>
88 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
91 * Limits and constants
93 #define MQFS_NAMELEN NAME_MAX
94 #define MQFS_DELEN (8 + MQFS_NAMELEN)
110 * mqfs_info: describes a mqfs instance
114 struct mqfs_node *mi_root;
115 struct unrhdr *mi_unrhdr;
119 LIST_ENTRY(mqfs_vdata) mv_link;
120 struct mqfs_node *mv_node;
121 struct vnode *mv_vnode;
126 * mqfs_node: describes a node (file or directory) within a mqfs
129 char mn_name[MQFS_NAMELEN+1];
130 struct mqfs_info *mn_info;
131 struct mqfs_node *mn_parent;
132 LIST_HEAD(,mqfs_node) mn_children;
133 LIST_ENTRY(mqfs_node) mn_sibling;
134 LIST_HEAD(,mqfs_vdata) mn_vnodes;
135 const void *mn_pr_root;
141 struct timespec mn_birth;
142 struct timespec mn_ctime;
143 struct timespec mn_atime;
144 struct timespec mn_mtime;
150 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
151 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
152 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
153 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
154 (fp)->f_data)->mn_data))
156 TAILQ_HEAD(msgq, mqueue_msg);
160 struct mqueue_notifier {
161 LIST_ENTRY(mqueue_notifier) nt_link;
162 struct sigevent nt_sigev;
164 struct proc *nt_proc;
177 struct selinfo mq_rsel;
178 struct selinfo mq_wsel;
179 struct mqueue_notifier *mq_notifier;
186 TAILQ_ENTRY(mqueue_msg) msg_link;
187 unsigned int msg_prio;
188 unsigned int msg_size;
189 /* following real data... */
192 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
193 "POSIX real time message queue");
195 static int default_maxmsg = 10;
196 static int default_msgsize = 1024;
198 static int maxmsg = 100;
199 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
200 &maxmsg, 0, "Default maximum messages in queue");
201 static int maxmsgsize = 16384;
202 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
203 &maxmsgsize, 0, "Default maximum message size");
204 static int maxmq = 100;
205 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
206 &maxmq, 0, "maximum message queues");
207 static int curmq = 0;
208 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
209 &curmq, 0, "current message queue number");
210 static int unloadable = 0;
211 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
213 static eventhandler_tag exit_tag;
215 /* Only one instance per-system */
216 static struct mqfs_info mqfs_data;
217 static uma_zone_t mqnode_zone;
218 static uma_zone_t mqueue_zone;
219 static uma_zone_t mvdata_zone;
220 static uma_zone_t mqnoti_zone;
221 static struct vop_vector mqfs_vnodeops;
222 static struct fileops mqueueops;
223 static unsigned mqfs_osd_jail_slot;
226 * Directory structure construction and manipulation
229 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
230 const char *name, int namelen, struct ucred *cred, int mode);
231 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
232 const char *name, int namelen, struct ucred *cred, int mode);
235 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
236 const char *name, int namelen, struct ucred *cred, int mode);
237 static int mqfs_destroy(struct mqfs_node *mn);
238 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
239 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
240 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
241 static int mqfs_prison_remove(void *obj, void *data);
244 * Message queue construction and maniplation
246 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
247 static void mqueue_free(struct mqueue *mq);
248 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
249 size_t msg_len, unsigned msg_prio, int waitok,
250 const struct timespec *abs_timeout);
251 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
252 size_t msg_len, unsigned *msg_prio, int waitok,
253 const struct timespec *abs_timeout);
254 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
256 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
258 static void mqueue_send_notification(struct mqueue *mq);
259 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
260 static void mq_proc_exit(void *arg, struct proc *p);
265 static void filt_mqdetach(struct knote *kn);
266 static int filt_mqread(struct knote *kn, long hint);
267 static int filt_mqwrite(struct knote *kn, long hint);
269 struct filterops mq_rfiltops = {
271 .f_detach = filt_mqdetach,
272 .f_event = filt_mqread,
274 struct filterops mq_wfiltops = {
276 .f_detach = filt_mqdetach,
277 .f_event = filt_mqwrite,
281 * Initialize fileno bitmap
284 mqfs_fileno_init(struct mqfs_info *mi)
288 up = new_unrhdr(1, INT_MAX, NULL);
293 * Tear down fileno bitmap
296 mqfs_fileno_uninit(struct mqfs_info *mi)
301 mi->mi_unrhdr = NULL;
306 * Allocate a file number
309 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
311 /* make sure our parent has a file number */
312 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
313 mqfs_fileno_alloc(mi, mn->mn_parent);
315 switch (mn->mn_type) {
319 case mqfstype_symlink:
320 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
323 KASSERT(mn->mn_parent != NULL,
324 ("mqfstype_this node has no parent"));
325 mn->mn_fileno = mn->mn_parent->mn_fileno;
327 case mqfstype_parent:
328 KASSERT(mn->mn_parent != NULL,
329 ("mqfstype_parent node has no parent"));
330 if (mn->mn_parent == mi->mi_root) {
331 mn->mn_fileno = mn->mn_parent->mn_fileno;
334 KASSERT(mn->mn_parent->mn_parent != NULL,
335 ("mqfstype_parent node has no grandparent"));
336 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
340 ("mqfs_fileno_alloc() called for unknown type node: %d",
347 * Release a file number
350 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
352 switch (mn->mn_type) {
356 case mqfstype_symlink:
357 free_unr(mi->mi_unrhdr, mn->mn_fileno);
360 case mqfstype_parent:
361 /* ignore these, as they don't "own" their file number */
365 ("mqfs_fileno_free() called for unknown type node: %d",
371 static __inline struct mqfs_node *
374 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
378 mqnode_free(struct mqfs_node *node)
380 uma_zfree(mqnode_zone, node);
384 mqnode_addref(struct mqfs_node *node)
386 atomic_fetchadd_int(&node->mn_refcount, 1);
390 mqnode_release(struct mqfs_node *node)
392 struct mqfs_info *mqfs;
395 mqfs = node->mn_info;
396 old = atomic_fetchadd_int(&node->mn_refcount, -1);
397 if (node->mn_type == mqfstype_dir ||
398 node->mn_type == mqfstype_root)
399 exp = 3; /* include . and .. */
403 int locked = sx_xlocked(&mqfs->mi_lock);
405 sx_xlock(&mqfs->mi_lock);
408 sx_xunlock(&mqfs->mi_lock);
413 * Add a node to a directory
416 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
418 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
419 KASSERT(parent->mn_info != NULL,
420 ("%s(): parent has no mn_info", __func__));
421 KASSERT(parent->mn_type == mqfstype_dir ||
422 parent->mn_type == mqfstype_root,
423 ("%s(): parent is not a directory", __func__));
425 node->mn_info = parent->mn_info;
426 node->mn_parent = parent;
427 LIST_INIT(&node->mn_children);
428 LIST_INIT(&node->mn_vnodes);
429 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
430 mqnode_addref(parent);
434 static struct mqfs_node *
435 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
438 struct mqfs_node *node;
440 node = mqnode_alloc();
441 strncpy(node->mn_name, name, namelen);
442 node->mn_pr_root = cred->cr_prison->pr_root;
443 node->mn_type = nodetype;
444 node->mn_refcount = 1;
445 vfs_timestamp(&node->mn_birth);
446 node->mn_ctime = node->mn_atime = node->mn_mtime
448 node->mn_uid = cred->cr_uid;
449 node->mn_gid = cred->cr_gid;
450 node->mn_mode = mode;
457 static struct mqfs_node *
458 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
459 struct ucred *cred, int mode)
461 struct mqfs_node *node;
463 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
464 if (mqfs_add_node(parent, node) != 0) {
472 * Add . and .. to a directory
475 mqfs_fixup_dir(struct mqfs_node *parent)
477 struct mqfs_node *dir;
479 dir = mqnode_alloc();
480 dir->mn_name[0] = '.';
481 dir->mn_type = mqfstype_this;
482 dir->mn_refcount = 1;
483 if (mqfs_add_node(parent, dir) != 0) {
488 dir = mqnode_alloc();
489 dir->mn_name[0] = dir->mn_name[1] = '.';
490 dir->mn_type = mqfstype_parent;
491 dir->mn_refcount = 1;
493 if (mqfs_add_node(parent, dir) != 0) {
506 static struct mqfs_node *
507 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
508 struct ucred *cred, int mode)
510 struct mqfs_node *node;
512 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
513 if (mqfs_add_node(parent, node) != 0) {
518 if (mqfs_fixup_dir(node) != 0) {
528 static struct mqfs_node *
529 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
530 struct ucred *cred, int mode)
532 struct mqfs_node *node;
534 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
535 if (mqfs_add_node(parent, node) != 0) {
545 * Destroy a node or a tree of nodes
548 mqfs_destroy(struct mqfs_node *node)
550 struct mqfs_node *parent;
552 KASSERT(node != NULL,
553 ("%s(): node is NULL", __func__));
554 KASSERT(node->mn_info != NULL,
555 ("%s(): node has no mn_info", __func__));
557 /* destroy children */
558 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
559 while (! LIST_EMPTY(&node->mn_children))
560 mqfs_destroy(LIST_FIRST(&node->mn_children));
562 /* unlink from parent */
563 if ((parent = node->mn_parent) != NULL) {
564 KASSERT(parent->mn_info == node->mn_info,
565 ("%s(): parent has different mn_info", __func__));
566 LIST_REMOVE(node, mn_sibling);
569 if (node->mn_fileno != 0)
570 mqfs_fileno_free(node->mn_info, node);
571 if (node->mn_data != NULL)
572 mqueue_free(node->mn_data);
578 * Mount a mqfs instance
581 mqfs_mount(struct mount *mp)
585 if (mp->mnt_flag & MNT_UPDATE)
588 mp->mnt_data = &mqfs_data;
590 mp->mnt_flag |= MNT_LOCAL;
595 vfs_mountedfrom(mp, "mqueue");
596 sbp->f_bsize = PAGE_SIZE;
597 sbp->f_iosize = PAGE_SIZE;
607 * Unmount a mqfs instance
610 mqfs_unmount(struct mount *mp, int mntflags)
614 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
620 * Return a root vnode
623 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
625 struct mqfs_info *mqfs;
628 mqfs = VFSTOMQFS(mp);
629 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
634 * Return filesystem stats
637 mqfs_statfs(struct mount *mp, struct statfs *sbp)
639 /* XXX update statistics */
644 * Initialize a mqfs instance
647 mqfs_init(struct vfsconf *vfc)
649 struct mqfs_node *root;
650 struct mqfs_info *mi;
651 osd_method_t methods[PR_MAXMETHOD] = {
652 [PR_METHOD_REMOVE] = mqfs_prison_remove,
655 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
656 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
657 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
658 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
659 mvdata_zone = uma_zcreate("mvdata",
660 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
661 NULL, UMA_ALIGN_PTR, 0);
662 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
663 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
665 sx_init(&mi->mi_lock, "mqfs lock");
666 /* set up the root diretory */
667 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
670 LIST_INIT(&root->mn_children);
671 LIST_INIT(&root->mn_vnodes);
673 mqfs_fileno_init(mi);
674 mqfs_fileno_alloc(mi, root);
675 mqfs_fixup_dir(root);
676 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
677 EVENTHANDLER_PRI_ANY);
678 mq_fdclose = mqueue_fdclose;
679 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
680 mqfs_osd_jail_slot = osd_jail_register(NULL, methods);
685 * Destroy a mqfs instance
688 mqfs_uninit(struct vfsconf *vfc)
690 struct mqfs_info *mi;
694 osd_jail_deregister(mqfs_osd_jail_slot);
695 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
697 mqfs_destroy(mi->mi_root);
699 mqfs_fileno_uninit(mi);
700 sx_destroy(&mi->mi_lock);
701 uma_zdestroy(mqnode_zone);
702 uma_zdestroy(mqueue_zone);
703 uma_zdestroy(mvdata_zone);
704 uma_zdestroy(mqnoti_zone);
712 do_recycle(void *context, int pending __unused)
714 struct vnode *vp = (struct vnode *)context;
716 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
726 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
728 struct mqfs_vdata *vd;
729 struct mqfs_info *mqfs;
730 struct vnode *newvpp;
735 sx_xlock(&mqfs->mi_lock);
736 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
737 if (vd->mv_vnode->v_mount == mp) {
746 sx_xunlock(&mqfs->mi_lock);
747 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
751 sx_xunlock(&mqfs->mi_lock);
753 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
756 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
757 error = insmntque(newvpp, mp);
761 sx_xlock(&mqfs->mi_lock);
763 * Check if it has already been allocated
764 * while we were blocked.
766 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
767 if (vd->mv_vnode->v_mount == mp) {
769 sx_xunlock(&mqfs->mi_lock);
779 vd = uma_zalloc(mvdata_zone, M_WAITOK);
783 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
784 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
786 switch (pn->mn_type) {
788 (*vpp)->v_vflag = VV_ROOT;
792 case mqfstype_parent:
793 (*vpp)->v_type = VDIR;
796 (*vpp)->v_type = VREG;
798 case mqfstype_symlink:
799 (*vpp)->v_type = VLNK;
802 KASSERT(0, ("mqfs_allocf called for null node\n"));
804 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
806 sx_xunlock(&mqfs->mi_lock);
811 * Search a directory entry
813 static struct mqfs_node *
814 mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred)
816 struct mqfs_node *pn;
819 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
820 pr_root = cred->cr_prison->pr_root;
821 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
822 /* Only match names within the same prison root directory */
823 if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) &&
824 strncmp(pn->mn_name, name, len) == 0 &&
825 pn->mn_name[len] == '\0')
832 * Look up a file or directory.
835 mqfs_lookupx(struct vop_cachedlookup_args *ap)
837 struct componentname *cnp;
838 struct vnode *dvp, **vpp;
839 struct mqfs_node *pd;
840 struct mqfs_node *pn;
841 struct mqfs_info *mqfs;
842 int nameiop, flags, error, namelen;
849 pname = cnp->cn_nameptr;
850 namelen = cnp->cn_namelen;
852 flags = cnp->cn_flags;
853 nameiop = cnp->cn_nameiop;
859 if (dvp->v_type != VDIR)
862 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
866 /* shortcut: check if the name is too long */
867 if (cnp->cn_namelen >= MQFS_NAMELEN)
871 if (namelen == 1 && pname[0] == '.') {
872 if ((flags & ISLASTCN) && nameiop != LOOKUP)
881 if (cnp->cn_flags & ISDOTDOT) {
882 if (dvp->v_vflag & VV_ROOT)
884 if ((flags & ISLASTCN) && nameiop != LOOKUP)
887 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
889 error = mqfs_allocv(dvp->v_mount, vpp, pn);
890 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
895 sx_xlock(&mqfs->mi_lock);
896 pn = mqfs_search(pd, pname, namelen, cnp->cn_cred);
899 sx_xunlock(&mqfs->mi_lock);
904 if (nameiop == DELETE && (flags & ISLASTCN)) {
905 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
919 error = mqfs_allocv(dvp->v_mount, vpp, pn);
921 if (error == 0 && cnp->cn_flags & MAKEENTRY)
922 cache_enter(dvp, *vpp, cnp);
928 /* will create a new entry in the directory ? */
929 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
930 && (flags & ISLASTCN)) {
931 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
934 cnp->cn_flags |= SAVENAME;
935 return (EJUSTRETURN);
941 struct vop_lookup_args {
942 struct vop_generic_args a_gen;
944 struct vnode **a_vpp;
945 struct componentname *a_cnp;
950 * vnode lookup operation
953 mqfs_lookup(struct vop_cachedlookup_args *ap)
957 rc = mqfs_lookupx(ap);
962 struct vop_create_args {
964 struct vnode **a_vpp;
965 struct componentname *a_cnp;
971 * vnode creation operation
974 mqfs_create(struct vop_create_args *ap)
976 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
977 struct componentname *cnp = ap->a_cnp;
978 struct mqfs_node *pd;
979 struct mqfs_node *pn;
983 pd = VTON(ap->a_dvp);
984 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
986 mq = mqueue_alloc(NULL);
989 sx_xlock(&mqfs->mi_lock);
990 if ((cnp->cn_flags & HASBUF) == 0)
991 panic("%s: no name", __func__);
992 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
993 cnp->cn_cred, ap->a_vap->va_mode);
995 sx_xunlock(&mqfs->mi_lock);
999 sx_xunlock(&mqfs->mi_lock);
1000 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1016 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
1018 struct mqfs_node *parent;
1019 struct mqfs_vdata *vd;
1022 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1024 if (ucred->cr_uid != pn->mn_uid &&
1025 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1027 else if (!pn->mn_deleted) {
1028 parent = pn->mn_parent;
1029 pn->mn_parent = NULL;
1031 LIST_REMOVE(pn, mn_sibling);
1032 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1033 cache_purge(vd->mv_vnode);
1034 vhold(vd->mv_vnode);
1035 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1038 mqnode_release(parent);
1045 struct vop_remove_args {
1046 struct vnode *a_dvp;
1048 struct componentname *a_cnp;
1053 * vnode removal operation
1056 mqfs_remove(struct vop_remove_args *ap)
1058 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1059 struct mqfs_node *pn;
1062 if (ap->a_vp->v_type == VDIR)
1064 pn = VTON(ap->a_vp);
1065 sx_xlock(&mqfs->mi_lock);
1066 error = do_unlink(pn, ap->a_cnp->cn_cred);
1067 sx_xunlock(&mqfs->mi_lock);
1072 struct vop_inactive_args {
1074 struct thread *a_td;
1079 mqfs_inactive(struct vop_inactive_args *ap)
1081 struct mqfs_node *pn = VTON(ap->a_vp);
1089 struct vop_reclaim_args {
1090 struct vop_generic_args a_gen;
1092 struct thread *a_td;
1097 mqfs_reclaim(struct vop_reclaim_args *ap)
1099 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1100 struct vnode *vp = ap->a_vp;
1101 struct mqfs_node *pn;
1102 struct mqfs_vdata *vd;
1106 sx_xlock(&mqfs->mi_lock);
1108 LIST_REMOVE(vd, mv_link);
1109 uma_zfree(mvdata_zone, vd);
1111 sx_xunlock(&mqfs->mi_lock);
1116 struct vop_open_args {
1117 struct vop_generic_args a_gen;
1120 struct ucred *a_cred;
1121 struct thread *a_td;
1127 mqfs_open(struct vop_open_args *ap)
1133 struct vop_close_args {
1134 struct vop_generic_args a_gen;
1137 struct ucred *a_cred;
1138 struct thread *a_td;
1143 mqfs_close(struct vop_close_args *ap)
1149 struct vop_access_args {
1150 struct vop_generic_args a_gen;
1152 accmode_t a_accmode;
1153 struct ucred *a_cred;
1154 struct thread *a_td;
1159 * Verify permissions
1162 mqfs_access(struct vop_access_args *ap)
1164 struct vnode *vp = ap->a_vp;
1168 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1171 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1172 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1177 struct vop_getattr_args {
1178 struct vop_generic_args a_gen;
1180 struct vattr *a_vap;
1181 struct ucred *a_cred;
1186 * Get file attributes
1189 mqfs_getattr(struct vop_getattr_args *ap)
1191 struct vnode *vp = ap->a_vp;
1192 struct mqfs_node *pn = VTON(vp);
1193 struct vattr *vap = ap->a_vap;
1196 vap->va_type = vp->v_type;
1197 vap->va_mode = pn->mn_mode;
1199 vap->va_uid = pn->mn_uid;
1200 vap->va_gid = pn->mn_gid;
1201 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1202 vap->va_fileid = pn->mn_fileno;
1204 vap->va_blocksize = PAGE_SIZE;
1205 vap->va_bytes = vap->va_size = 0;
1206 vap->va_atime = pn->mn_atime;
1207 vap->va_mtime = pn->mn_mtime;
1208 vap->va_ctime = pn->mn_ctime;
1209 vap->va_birthtime = pn->mn_birth;
1212 vap->va_rdev = NODEV;
1214 vap->va_filerev = 0;
1219 struct vop_setattr_args {
1220 struct vop_generic_args a_gen;
1222 struct vattr *a_vap;
1223 struct ucred *a_cred;
1230 mqfs_setattr(struct vop_setattr_args *ap)
1232 struct mqfs_node *pn;
1243 if ((vap->va_type != VNON) ||
1244 (vap->va_nlink != VNOVAL) ||
1245 (vap->va_fsid != VNOVAL) ||
1246 (vap->va_fileid != VNOVAL) ||
1247 (vap->va_blocksize != VNOVAL) ||
1248 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1249 (vap->va_rdev != VNOVAL) ||
1250 ((int)vap->va_bytes != VNOVAL) ||
1251 (vap->va_gen != VNOVAL)) {
1258 if (vap->va_uid == (uid_t)VNOVAL)
1262 if (vap->va_gid == (gid_t)VNOVAL)
1267 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1269 * To modify the ownership of a file, must possess VADMIN
1272 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1276 * XXXRW: Why is there a privilege check here: shouldn't the
1277 * check in VOP_ACCESS() be enough? Also, are the group bits
1278 * below definitely right?
1280 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1281 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1282 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1289 if (vap->va_mode != (mode_t)VNOVAL) {
1290 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1291 (error = priv_check(td, PRIV_MQ_ADMIN)))
1293 pn->mn_mode = vap->va_mode;
1297 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1298 /* See the comment in ufs_vnops::ufs_setattr(). */
1299 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1300 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1301 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1303 if (vap->va_atime.tv_sec != VNOVAL) {
1304 pn->mn_atime = vap->va_atime;
1306 if (vap->va_mtime.tv_sec != VNOVAL) {
1307 pn->mn_mtime = vap->va_mtime;
1312 vfs_timestamp(&pn->mn_ctime);
1318 struct vop_read_args {
1319 struct vop_generic_args a_gen;
1323 struct ucred *a_cred;
1331 mqfs_read(struct vop_read_args *ap)
1334 struct vnode *vp = ap->a_vp;
1335 struct uio *uio = ap->a_uio;
1336 struct mqfs_node *pn;
1340 if (vp->v_type != VREG)
1345 snprintf(buf, sizeof(buf),
1346 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1351 buf[sizeof(buf)-1] = '\0';
1353 error = uiomove_frombuf(buf, len, uio);
1358 struct vop_readdir_args {
1359 struct vop_generic_args a_gen;
1362 struct ucred *a_cred;
1370 * Return directory entries.
1373 mqfs_readdir(struct vop_readdir_args *ap)
1376 struct mqfs_info *mi;
1377 struct mqfs_node *pd;
1378 struct mqfs_node *pn;
1379 struct dirent entry;
1381 const void *pr_root;
1382 int *tmp_ncookies = NULL;
1387 mi = VFSTOMQFS(vp->v_mount);
1391 if (vp->v_type != VDIR)
1394 if (uio->uio_offset < 0)
1397 if (ap->a_ncookies != NULL) {
1398 tmp_ncookies = ap->a_ncookies;
1399 *ap->a_ncookies = 0;
1400 ap->a_ncookies = NULL;
1406 pr_root = ap->a_cred->cr_prison->pr_root;
1407 sx_xlock(&mi->mi_lock);
1409 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1410 entry.d_reclen = sizeof(entry);
1413 * Only show names within the same prison root directory
1414 * (or not associated with a prison, e.g. "." and "..").
1416 if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root)
1419 mqfs_fileno_alloc(mi, pn);
1420 entry.d_fileno = pn->mn_fileno;
1421 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1422 entry.d_name[i] = pn->mn_name[i];
1423 entry.d_name[i] = 0;
1425 switch (pn->mn_type) {
1429 case mqfstype_parent:
1430 entry.d_type = DT_DIR;
1433 entry.d_type = DT_REG;
1435 case mqfstype_symlink:
1436 entry.d_type = DT_LNK;
1439 panic("%s has unexpected node type: %d", pn->mn_name,
1442 if (entry.d_reclen > uio->uio_resid)
1444 if (offset >= uio->uio_offset) {
1445 error = vfs_read_dirent(ap, &entry, offset);
1449 offset += entry.d_reclen;
1451 sx_xunlock(&mi->mi_lock);
1453 uio->uio_offset = offset;
1455 if (tmp_ncookies != NULL)
1456 ap->a_ncookies = tmp_ncookies;
1464 struct vop_mkdir_args {
1465 struct vnode *a_dvp;
1466 struvt vnode **a_vpp;
1467 struvt componentname *a_cnp;
1468 struct vattr *a_vap;
1473 * Create a directory.
1476 mqfs_mkdir(struct vop_mkdir_args *ap)
1478 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1479 struct componentname *cnp = ap->a_cnp;
1480 struct mqfs_node *pd = VTON(ap->a_dvp);
1481 struct mqfs_node *pn;
1484 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1486 sx_xlock(&mqfs->mi_lock);
1487 if ((cnp->cn_flags & HASBUF) == 0)
1488 panic("%s: no name", __func__);
1489 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1490 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1493 sx_xunlock(&mqfs->mi_lock);
1497 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1504 struct vop_rmdir_args {
1505 struct vnode *a_dvp;
1507 struct componentname *a_cnp;
1512 * Remove a directory.
1515 mqfs_rmdir(struct vop_rmdir_args *ap)
1517 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1518 struct mqfs_node *pn = VTON(ap->a_vp);
1519 struct mqfs_node *pt;
1521 if (pn->mn_type != mqfstype_dir)
1524 sx_xlock(&mqfs->mi_lock);
1525 if (pn->mn_deleted) {
1526 sx_xunlock(&mqfs->mi_lock);
1530 pt = LIST_FIRST(&pn->mn_children);
1531 pt = LIST_NEXT(pt, mn_sibling);
1532 pt = LIST_NEXT(pt, mn_sibling);
1534 sx_xunlock(&mqfs->mi_lock);
1538 pn->mn_parent = NULL;
1540 LIST_REMOVE(pn, mn_sibling);
1543 sx_xunlock(&mqfs->mi_lock);
1544 cache_purge(ap->a_vp);
1551 * See if this prison root is obsolete, and clean up associated queues if it is.
1554 mqfs_prison_remove(void *obj, void *data __unused)
1556 const struct prison *pr = obj;
1557 const struct prison *tpr;
1558 struct mqfs_node *pn, *tpn;
1562 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1563 if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0)
1568 * No jails are rooted in this directory anymore,
1569 * so no queues should be either.
1571 sx_xlock(&mqfs_data.mi_lock);
1572 LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children,
1574 if (pn->mn_pr_root == pr->pr_root)
1575 (void)do_unlink(pn, curthread->td_ucred);
1577 sx_xunlock(&mqfs_data.mi_lock);
1583 * Allocate a message queue
1585 static struct mqueue *
1586 mqueue_alloc(const struct mq_attr *attr)
1592 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1593 TAILQ_INIT(&mq->mq_msgq);
1595 mq->mq_maxmsg = attr->mq_maxmsg;
1596 mq->mq_msgsize = attr->mq_msgsize;
1598 mq->mq_maxmsg = default_maxmsg;
1599 mq->mq_msgsize = default_msgsize;
1601 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1602 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1603 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1604 atomic_add_int(&curmq, 1);
1609 * Destroy a message queue
1612 mqueue_free(struct mqueue *mq)
1614 struct mqueue_msg *msg;
1616 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1617 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1618 free(msg, M_MQUEUEDATA);
1621 mtx_destroy(&mq->mq_mutex);
1622 seldrain(&mq->mq_rsel);
1623 seldrain(&mq->mq_wsel);
1624 knlist_destroy(&mq->mq_rsel.si_note);
1625 knlist_destroy(&mq->mq_wsel.si_note);
1626 uma_zfree(mqueue_zone, mq);
1627 atomic_add_int(&curmq, -1);
1631 * Load a message from user space
1633 static struct mqueue_msg *
1634 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1636 struct mqueue_msg *msg;
1640 len = sizeof(struct mqueue_msg) + msg_size;
1641 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1642 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1645 free(msg, M_MQUEUEDATA);
1648 msg->msg_size = msg_size;
1649 msg->msg_prio = msg_prio;
1655 * Save a message to user space
1658 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1662 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1664 if (error == 0 && msg_prio != NULL)
1665 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1670 * Free a message's memory
1672 static __inline void
1673 mqueue_freemsg(struct mqueue_msg *msg)
1675 free(msg, M_MQUEUEDATA);
1679 * Send a message. if waitok is false, thread will not be
1680 * blocked if there is no data in queue, otherwise, absolute
1681 * time will be checked.
1684 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1685 size_t msg_len, unsigned msg_prio, int waitok,
1686 const struct timespec *abs_timeout)
1688 struct mqueue_msg *msg;
1689 struct timespec ts, ts2;
1693 if (msg_prio >= MQ_PRIO_MAX)
1695 if (msg_len > mq->mq_msgsize)
1697 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1701 /* O_NONBLOCK case */
1703 error = _mqueue_send(mq, msg, -1);
1709 /* we allow a null timeout (wait forever) */
1710 if (abs_timeout == NULL) {
1711 error = _mqueue_send(mq, msg, 0);
1717 /* send it before checking time */
1718 error = _mqueue_send(mq, msg, -1);
1722 if (error != EAGAIN)
1725 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1732 timespecsub(&ts2, &ts);
1733 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1737 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1738 error = _mqueue_send(mq, msg, tvtohz(&tv));
1739 if (error != ETIMEDOUT)
1745 mqueue_freemsg(msg);
1750 * Common routine to send a message
1753 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1755 struct mqueue_msg *msg2;
1758 mtx_lock(&mq->mq_mutex);
1759 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1761 mtx_unlock(&mq->mq_mutex);
1765 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1766 PCATCH, "mqsend", timo);
1768 if (error == EAGAIN)
1771 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1772 mtx_unlock(&mq->mq_mutex);
1776 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1777 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1779 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1780 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1782 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1783 if (msg2->msg_prio < msg->msg_prio)
1786 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1790 mq->mq_totalbytes += msg->msg_size;
1791 if (mq->mq_receivers)
1792 wakeup_one(&mq->mq_receivers);
1793 else if (mq->mq_notifier != NULL)
1794 mqueue_send_notification(mq);
1795 if (mq->mq_flags & MQ_RSEL) {
1796 mq->mq_flags &= ~MQ_RSEL;
1797 selwakeup(&mq->mq_rsel);
1799 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1800 mtx_unlock(&mq->mq_mutex);
1805 * Send realtime a signal to process which registered itself
1806 * successfully by mq_notify.
1809 mqueue_send_notification(struct mqueue *mq)
1811 struct mqueue_notifier *nt;
1816 mtx_assert(&mq->mq_mutex, MA_OWNED);
1817 nt = mq->mq_notifier;
1818 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1820 error = sigev_findtd(p, &nt->nt_sigev, &td);
1822 mq->mq_notifier = NULL;
1825 if (!KSI_ONQ(&nt->nt_ksi)) {
1826 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1827 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1831 mq->mq_notifier = NULL;
1835 * Get a message. if waitok is false, thread will not be
1836 * blocked if there is no data in queue, otherwise, absolute
1837 * time will be checked.
1840 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1841 size_t msg_len, unsigned *msg_prio, int waitok,
1842 const struct timespec *abs_timeout)
1844 struct mqueue_msg *msg;
1845 struct timespec ts, ts2;
1849 if (msg_len < mq->mq_msgsize)
1852 /* O_NONBLOCK case */
1854 error = _mqueue_recv(mq, &msg, -1);
1860 /* we allow a null timeout (wait forever). */
1861 if (abs_timeout == NULL) {
1862 error = _mqueue_recv(mq, &msg, 0);
1868 /* try to get a message before checking time */
1869 error = _mqueue_recv(mq, &msg, -1);
1873 if (error != EAGAIN)
1876 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1884 timespecsub(&ts2, &ts);
1885 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1889 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1890 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1893 if (error != ETIMEDOUT)
1898 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1900 curthread->td_retval[0] = msg->msg_size;
1901 curthread->td_retval[1] = 0;
1903 mqueue_freemsg(msg);
1908 * Common routine to receive a message
1911 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1915 mtx_lock(&mq->mq_mutex);
1916 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1918 mtx_unlock(&mq->mq_mutex);
1922 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1923 PCATCH, "mqrecv", timo);
1925 if (error == EAGAIN)
1930 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1932 mq->mq_totalbytes -= (*msg)->msg_size;
1934 wakeup_one(&mq->mq_senders);
1935 if (mq->mq_flags & MQ_WSEL) {
1936 mq->mq_flags &= ~MQ_WSEL;
1937 selwakeup(&mq->mq_wsel);
1939 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1941 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1942 !TAILQ_EMPTY(&mq->mq_msgq)) {
1943 mqueue_send_notification(mq);
1945 mtx_unlock(&mq->mq_mutex);
1949 static __inline struct mqueue_notifier *
1950 notifier_alloc(void)
1952 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1955 static __inline void
1956 notifier_free(struct mqueue_notifier *p)
1958 uma_zfree(mqnoti_zone, p);
1961 static struct mqueue_notifier *
1962 notifier_search(struct proc *p, int fd)
1964 struct mqueue_notifier *nt;
1966 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1967 if (nt->nt_ksi.ksi_mqd == fd)
1973 static __inline void
1974 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1976 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1979 static __inline void
1980 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1982 LIST_REMOVE(nt, nt_link);
1987 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1989 struct mqueue_notifier *nt;
1991 mtx_assert(&mq->mq_mutex, MA_OWNED);
1993 nt = notifier_search(p, fd);
1995 if (mq->mq_notifier == nt)
1996 mq->mq_notifier = NULL;
1997 sigqueue_take(&nt->nt_ksi);
1998 notifier_delete(p, nt);
2004 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
2005 const struct mq_attr *attr)
2007 char path[MQFS_NAMELEN + 1];
2008 struct mqfs_node *pn;
2009 struct filedesc *fdp;
2012 int fd, error, len, cmode;
2014 fdp = td->td_proc->p_fd;
2015 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
2017 if ((flags & O_CREAT) != 0 && attr != NULL) {
2018 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
2020 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
2024 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
2029 * The first character of name must be a slash (/) character
2030 * and the remaining characters of name cannot include any slash
2034 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2037 error = falloc(td, &fp, &fd, O_CLOEXEC);
2041 sx_xlock(&mqfs_data.mi_lock);
2042 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2044 if (!(flags & O_CREAT)) {
2047 mq = mqueue_alloc(attr);
2051 pn = mqfs_create_file(mqfs_data.mi_root,
2052 path + 1, len - 1, td->td_ucred,
2065 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2068 accmode_t accmode = 0;
2074 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2075 pn->mn_gid, accmode, td->td_ucred, NULL);
2080 sx_xunlock(&mqfs_data.mi_lock);
2081 fdclose(td, fp, fd);
2087 sx_xunlock(&mqfs_data.mi_lock);
2089 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2092 td->td_retval[0] = fd;
2098 * Syscall to open a message queue.
2101 sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
2103 struct mq_attr attr;
2106 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2108 flags = FFLAGS(uap->flags);
2109 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2110 error = copyin(uap->attr, &attr, sizeof(attr));
2114 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2115 uap->attr != NULL ? &attr : NULL));
2119 * Syscall to unlink a message queue.
2122 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2124 char path[MQFS_NAMELEN+1];
2125 struct mqfs_node *pn;
2128 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2133 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2136 sx_xlock(&mqfs_data.mi_lock);
2137 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2139 error = do_unlink(pn, td->td_ucred);
2142 sx_xunlock(&mqfs_data.mi_lock);
2146 typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **);
2149 * Get message queue by giving file slot
2152 _getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func,
2153 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2155 struct mqfs_node *pn;
2158 error = func(td, fd, rightsp, fpp);
2161 if (&mqueueops != (*fpp)->f_ops) {
2165 pn = (*fpp)->f_data;
2174 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2175 struct mqueue **pmq)
2177 cap_rights_t rights;
2179 return _getmq(td, fd, cap_rights_init(&rights, CAP_EVENT), fget,
2184 getmq_read(struct thread *td, int fd, struct file **fpp,
2185 struct mqfs_node **ppn, struct mqueue **pmq)
2187 cap_rights_t rights;
2189 return _getmq(td, fd, cap_rights_init(&rights, CAP_READ), fget_read,
2194 getmq_write(struct thread *td, int fd, struct file **fpp,
2195 struct mqfs_node **ppn, struct mqueue **pmq)
2197 cap_rights_t rights;
2199 return _getmq(td, fd, cap_rights_init(&rights, CAP_WRITE), fget_write,
2204 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2205 struct mq_attr *oattr)
2212 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2214 error = getmq(td, mqd, &fp, NULL, &mq);
2217 oattr->mq_maxmsg = mq->mq_maxmsg;
2218 oattr->mq_msgsize = mq->mq_msgsize;
2219 oattr->mq_curmsgs = mq->mq_curmsgs;
2222 oflag = flag = fp->f_flag;
2223 flag &= ~O_NONBLOCK;
2224 flag |= (attr->mq_flags & O_NONBLOCK);
2225 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2228 oattr->mq_flags = (O_NONBLOCK & oflag);
2234 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2236 struct mq_attr attr, oattr;
2239 if (uap->attr != NULL) {
2240 error = copyin(uap->attr, &attr, sizeof(attr));
2244 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2246 if (error == 0 && uap->oattr != NULL) {
2247 bzero(oattr.__reserved, sizeof(oattr.__reserved));
2248 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2254 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2258 struct timespec *abs_timeout, ets;
2262 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2265 if (uap->abs_timeout != NULL) {
2266 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2272 waitok = !(fp->f_flag & O_NONBLOCK);
2273 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2274 uap->msg_prio, waitok, abs_timeout);
2280 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2284 struct timespec *abs_timeout, ets;
2287 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2290 if (uap->abs_timeout != NULL) {
2291 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2297 waitok = !(fp->f_flag & O_NONBLOCK);
2298 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2299 uap->msg_prio, waitok, abs_timeout);
2305 kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
2308 cap_rights_t rights;
2310 struct filedesc *fdp;
2313 struct file *fp, *fp2;
2314 struct mqueue_notifier *nt, *newnt = NULL;
2317 if (sigev != NULL) {
2318 if (sigev->sigev_notify != SIGEV_SIGNAL &&
2319 sigev->sigev_notify != SIGEV_THREAD_ID &&
2320 sigev->sigev_notify != SIGEV_NONE)
2322 if ((sigev->sigev_notify == SIGEV_SIGNAL ||
2323 sigev->sigev_notify == SIGEV_THREAD_ID) &&
2324 !_SIG_VALID(sigev->sigev_signo))
2328 fdp = td->td_proc->p_fd;
2329 error = getmq(td, mqd, &fp, NULL, &mq);
2333 FILEDESC_SLOCK(fdp);
2334 fp2 = fget_locked(fdp, mqd);
2336 FILEDESC_SUNLOCK(fdp);
2341 error = cap_check(cap_rights(fdp, mqd),
2342 cap_rights_init(&rights, CAP_EVENT));
2344 FILEDESC_SUNLOCK(fdp);
2349 FILEDESC_SUNLOCK(fdp);
2353 mtx_lock(&mq->mq_mutex);
2354 FILEDESC_SUNLOCK(fdp);
2355 if (sigev != NULL) {
2356 if (mq->mq_notifier != NULL) {
2360 nt = notifier_search(p, mqd);
2362 if (newnt == NULL) {
2364 mtx_unlock(&mq->mq_mutex);
2365 newnt = notifier_alloc();
2371 sigqueue_take(&nt->nt_ksi);
2372 if (newnt != NULL) {
2373 notifier_free(newnt);
2379 ksiginfo_init(&nt->nt_ksi);
2380 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2381 nt->nt_ksi.ksi_code = SI_MESGQ;
2383 nt->nt_ksi.ksi_mqd = mqd;
2384 notifier_insert(p, nt);
2386 nt->nt_sigev = *sigev;
2387 mq->mq_notifier = nt;
2390 * if there is no receivers and message queue
2391 * is not empty, we should send notification
2392 * as soon as possible.
2394 if (mq->mq_receivers == 0 &&
2395 !TAILQ_EMPTY(&mq->mq_msgq))
2396 mqueue_send_notification(mq);
2399 notifier_remove(p, mq, mqd);
2401 mtx_unlock(&mq->mq_mutex);
2406 notifier_free(newnt);
2411 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2413 struct sigevent ev, *evp;
2416 if (uap->sigev == NULL) {
2419 error = copyin(uap->sigev, &ev, sizeof(ev));
2424 return (kern_kmq_notify(td, uap->mqd, evp));
2428 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2430 struct filedesc *fdp;
2433 fdp = td->td_proc->p_fd;
2434 FILEDESC_LOCK_ASSERT(fdp);
2436 if (fp->f_ops == &mqueueops) {
2438 mtx_lock(&mq->mq_mutex);
2439 notifier_remove(td->td_proc, mq, fd);
2441 /* have to wakeup thread in same process */
2442 if (mq->mq_flags & MQ_RSEL) {
2443 mq->mq_flags &= ~MQ_RSEL;
2444 selwakeup(&mq->mq_rsel);
2446 if (mq->mq_flags & MQ_WSEL) {
2447 mq->mq_flags &= ~MQ_WSEL;
2448 selwakeup(&mq->mq_wsel);
2450 mtx_unlock(&mq->mq_mutex);
2455 mq_proc_exit(void *arg __unused, struct proc *p)
2457 struct filedesc *fdp;
2463 FILEDESC_SLOCK(fdp);
2464 for (i = 0; i < fdp->fd_nfiles; ++i) {
2465 fp = fget_locked(fdp, i);
2466 if (fp != NULL && fp->f_ops == &mqueueops) {
2468 mtx_lock(&mq->mq_mutex);
2469 notifier_remove(p, FPTOMQ(fp), i);
2470 mtx_unlock(&mq->mq_mutex);
2473 FILEDESC_SUNLOCK(fdp);
2474 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2478 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
2479 int flags, struct thread *td)
2481 return (EOPNOTSUPP);
2485 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
2486 int flags, struct thread *td)
2488 return (EOPNOTSUPP);
2492 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred,
2500 mqf_ioctl(struct file *fp, u_long cmd, void *data,
2501 struct ucred *active_cred, struct thread *td)
2507 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2510 struct mqueue *mq = FPTOMQ(fp);
2513 mtx_lock(&mq->mq_mutex);
2514 if (events & (POLLIN | POLLRDNORM)) {
2515 if (mq->mq_curmsgs) {
2516 revents |= events & (POLLIN | POLLRDNORM);
2518 mq->mq_flags |= MQ_RSEL;
2519 selrecord(td, &mq->mq_rsel);
2522 if (events & POLLOUT) {
2523 if (mq->mq_curmsgs < mq->mq_maxmsg)
2526 mq->mq_flags |= MQ_WSEL;
2527 selrecord(td, &mq->mq_wsel);
2530 mtx_unlock(&mq->mq_mutex);
2535 mqf_close(struct file *fp, struct thread *td)
2537 struct mqfs_node *pn;
2539 fp->f_ops = &badfileops;
2542 sx_xlock(&mqfs_data.mi_lock);
2544 sx_xunlock(&mqfs_data.mi_lock);
2549 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2552 struct mqfs_node *pn = fp->f_data;
2554 bzero(st, sizeof *st);
2555 sx_xlock(&mqfs_data.mi_lock);
2556 st->st_atim = pn->mn_atime;
2557 st->st_mtim = pn->mn_mtime;
2558 st->st_ctim = pn->mn_ctime;
2559 st->st_birthtim = pn->mn_birth;
2560 st->st_uid = pn->mn_uid;
2561 st->st_gid = pn->mn_gid;
2562 st->st_mode = S_IFIFO | pn->mn_mode;
2563 sx_xunlock(&mqfs_data.mi_lock);
2568 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2571 struct mqfs_node *pn;
2576 sx_xlock(&mqfs_data.mi_lock);
2577 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
2581 pn->mn_mode = mode & ACCESSPERMS;
2583 sx_xunlock(&mqfs_data.mi_lock);
2588 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2591 struct mqfs_node *pn;
2596 sx_xlock(&mqfs_data.mi_lock);
2597 if (uid == (uid_t)-1)
2599 if (gid == (gid_t)-1)
2601 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
2602 (gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
2603 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
2608 sx_xunlock(&mqfs_data.mi_lock);
2613 mqf_kqfilter(struct file *fp, struct knote *kn)
2615 struct mqueue *mq = FPTOMQ(fp);
2618 if (kn->kn_filter == EVFILT_READ) {
2619 kn->kn_fop = &mq_rfiltops;
2620 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2621 } else if (kn->kn_filter == EVFILT_WRITE) {
2622 kn->kn_fop = &mq_wfiltops;
2623 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2630 filt_mqdetach(struct knote *kn)
2632 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2634 if (kn->kn_filter == EVFILT_READ)
2635 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2636 else if (kn->kn_filter == EVFILT_WRITE)
2637 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2639 panic("filt_mqdetach");
2643 filt_mqread(struct knote *kn, long hint)
2645 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2647 mtx_assert(&mq->mq_mutex, MA_OWNED);
2648 return (mq->mq_curmsgs != 0);
2652 filt_mqwrite(struct knote *kn, long hint)
2654 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2656 mtx_assert(&mq->mq_mutex, MA_OWNED);
2657 return (mq->mq_curmsgs < mq->mq_maxmsg);
2660 static struct fileops mqueueops = {
2661 .fo_read = mqf_read,
2662 .fo_write = mqf_write,
2663 .fo_truncate = mqf_truncate,
2664 .fo_ioctl = mqf_ioctl,
2665 .fo_poll = mqf_poll,
2666 .fo_kqfilter = mqf_kqfilter,
2667 .fo_stat = mqf_stat,
2668 .fo_chmod = mqf_chmod,
2669 .fo_chown = mqf_chown,
2670 .fo_close = mqf_close,
2671 .fo_sendfile = invfo_sendfile,
2674 static struct vop_vector mqfs_vnodeops = {
2675 .vop_default = &default_vnodeops,
2676 .vop_access = mqfs_access,
2677 .vop_cachedlookup = mqfs_lookup,
2678 .vop_lookup = vfs_cache_lookup,
2679 .vop_reclaim = mqfs_reclaim,
2680 .vop_create = mqfs_create,
2681 .vop_remove = mqfs_remove,
2682 .vop_inactive = mqfs_inactive,
2683 .vop_open = mqfs_open,
2684 .vop_close = mqfs_close,
2685 .vop_getattr = mqfs_getattr,
2686 .vop_setattr = mqfs_setattr,
2687 .vop_read = mqfs_read,
2688 .vop_write = VOP_EOPNOTSUPP,
2689 .vop_readdir = mqfs_readdir,
2690 .vop_mkdir = VOP_EOPNOTSUPP,
2691 .vop_rmdir = VOP_EOPNOTSUPP
2694 static struct vfsops mqfs_vfsops = {
2695 .vfs_init = mqfs_init,
2696 .vfs_uninit = mqfs_uninit,
2697 .vfs_mount = mqfs_mount,
2698 .vfs_unmount = mqfs_unmount,
2699 .vfs_root = mqfs_root,
2700 .vfs_statfs = mqfs_statfs,
2703 static struct vfsconf mqueuefs_vfsconf = {
2704 .vfc_version = VFS_VERSION,
2705 .vfc_name = "mqueuefs",
2706 .vfc_vfsops = &mqfs_vfsops,
2708 .vfc_flags = VFCF_SYNTHETIC
2711 static struct syscall_helper_data mq_syscalls[] = {
2712 SYSCALL_INIT_HELPER(kmq_open),
2713 SYSCALL_INIT_HELPER(kmq_setattr),
2714 SYSCALL_INIT_HELPER(kmq_timedsend),
2715 SYSCALL_INIT_HELPER(kmq_timedreceive),
2716 SYSCALL_INIT_HELPER(kmq_notify),
2717 SYSCALL_INIT_HELPER(kmq_unlink),
2721 #ifdef COMPAT_FREEBSD32
2722 #include <compat/freebsd32/freebsd32.h>
2723 #include <compat/freebsd32/freebsd32_proto.h>
2724 #include <compat/freebsd32/freebsd32_signal.h>
2725 #include <compat/freebsd32/freebsd32_syscall.h>
2726 #include <compat/freebsd32/freebsd32_util.h>
2729 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2732 to->mq_flags = from->mq_flags;
2733 to->mq_maxmsg = from->mq_maxmsg;
2734 to->mq_msgsize = from->mq_msgsize;
2735 to->mq_curmsgs = from->mq_curmsgs;
2739 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2742 to->mq_flags = from->mq_flags;
2743 to->mq_maxmsg = from->mq_maxmsg;
2744 to->mq_msgsize = from->mq_msgsize;
2745 to->mq_curmsgs = from->mq_curmsgs;
2749 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
2751 struct mq_attr attr;
2752 struct mq_attr32 attr32;
2755 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2757 flags = FFLAGS(uap->flags);
2758 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2759 error = copyin(uap->attr, &attr32, sizeof(attr32));
2762 mq_attr_from32(&attr32, &attr);
2764 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2765 uap->attr != NULL ? &attr : NULL));
2769 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
2771 struct mq_attr attr, oattr;
2772 struct mq_attr32 attr32, oattr32;
2775 if (uap->attr != NULL) {
2776 error = copyin(uap->attr, &attr32, sizeof(attr32));
2779 mq_attr_from32(&attr32, &attr);
2781 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2783 if (error == 0 && uap->oattr != NULL) {
2784 mq_attr_to32(&oattr, &oattr32);
2785 bzero(oattr32.__reserved, sizeof(oattr32.__reserved));
2786 error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2792 freebsd32_kmq_timedsend(struct thread *td,
2793 struct freebsd32_kmq_timedsend_args *uap)
2797 struct timespec32 ets32;
2798 struct timespec *abs_timeout, ets;
2802 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2805 if (uap->abs_timeout != NULL) {
2806 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2809 CP(ets32, ets, tv_sec);
2810 CP(ets32, ets, tv_nsec);
2814 waitok = !(fp->f_flag & O_NONBLOCK);
2815 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2816 uap->msg_prio, waitok, abs_timeout);
2822 freebsd32_kmq_timedreceive(struct thread *td,
2823 struct freebsd32_kmq_timedreceive_args *uap)
2827 struct timespec32 ets32;
2828 struct timespec *abs_timeout, ets;
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);
2890 #ifdef COMPAT_FREEBSD32
2891 error = syscall32_helper_register(mq32_syscalls);
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);