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_compat.h"
50 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/systm.h>
53 #include <sys/limits.h>
55 #include <sys/dirent.h>
56 #include <sys/event.h>
57 #include <sys/eventhandler.h>
58 #include <sys/fcntl.h>
60 #include <sys/filedesc.h>
62 #include <sys/malloc.h>
63 #include <sys/module.h>
64 #include <sys/mount.h>
65 #include <sys/mqueue.h>
66 #include <sys/mutex.h>
67 #include <sys/namei.h>
68 #include <sys/posix4.h>
72 #include <sys/queue.h>
73 #include <sys/sysproto.h>
75 #include <sys/syscall.h>
76 #include <sys/syscallsubr.h>
77 #include <sys/sysent.h>
79 #include <sys/sysctl.h>
80 #include <sys/taskqueue.h>
81 #include <sys/unistd.h>
82 #include <sys/vnode.h>
83 #include <machine/atomic.h>
86 * Limits and constants
88 #define MQFS_NAMELEN NAME_MAX
89 #define MQFS_DELEN (8 + MQFS_NAMELEN)
105 * mqfs_info: describes a mqfs instance
109 struct mqfs_node *mi_root;
110 struct unrhdr *mi_unrhdr;
114 LIST_ENTRY(mqfs_vdata) mv_link;
115 struct mqfs_node *mv_node;
116 struct vnode *mv_vnode;
121 * mqfs_node: describes a node (file or directory) within a mqfs
124 char mn_name[MQFS_NAMELEN+1];
125 struct mqfs_info *mn_info;
126 struct mqfs_node *mn_parent;
127 LIST_HEAD(,mqfs_node) mn_children;
128 LIST_ENTRY(mqfs_node) mn_sibling;
129 LIST_HEAD(,mqfs_vdata) mn_vnodes;
135 struct timespec mn_birth;
136 struct timespec mn_ctime;
137 struct timespec mn_atime;
138 struct timespec mn_mtime;
144 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
145 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
146 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
147 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
148 (fp)->f_data)->mn_data))
150 TAILQ_HEAD(msgq, mqueue_msg);
154 struct mqueue_notifier {
155 LIST_ENTRY(mqueue_notifier) nt_link;
156 struct sigevent nt_sigev;
158 struct proc *nt_proc;
171 struct selinfo mq_rsel;
172 struct selinfo mq_wsel;
173 struct mqueue_notifier *mq_notifier;
180 TAILQ_ENTRY(mqueue_msg) msg_link;
181 unsigned int msg_prio;
182 unsigned int msg_size;
183 /* following real data... */
186 SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
187 "POSIX real time message queue");
189 static int default_maxmsg = 10;
190 static int default_msgsize = 1024;
192 static int maxmsg = 100;
193 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
194 &maxmsg, 0, "Default maximum messages in queue");
195 static int maxmsgsize = 16384;
196 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
197 &maxmsgsize, 0, "Default maximum message size");
198 static int maxmq = 100;
199 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
200 &maxmq, 0, "maximum message queues");
201 static int curmq = 0;
202 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
203 &curmq, 0, "current message queue number");
204 static int unloadable = 0;
205 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
207 static eventhandler_tag exit_tag;
209 /* Only one instance per-system */
210 static struct mqfs_info mqfs_data;
211 static uma_zone_t mqnode_zone;
212 static uma_zone_t mqueue_zone;
213 static uma_zone_t mvdata_zone;
214 static uma_zone_t mqnoti_zone;
215 static struct vop_vector mqfs_vnodeops;
216 static struct fileops mqueueops;
219 * Directory structure construction and manipulation
222 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
223 const char *name, int namelen, struct ucred *cred, int mode);
224 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
225 const char *name, int namelen, struct ucred *cred, int mode);
228 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
229 const char *name, int namelen, struct ucred *cred, int mode);
230 static int mqfs_destroy(struct mqfs_node *mn);
231 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
232 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
233 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
236 * Message queue construction and maniplation
238 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
239 static void mqueue_free(struct mqueue *mq);
240 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
241 size_t msg_len, unsigned msg_prio, int waitok,
242 const struct timespec *abs_timeout);
243 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
244 size_t msg_len, unsigned *msg_prio, int waitok,
245 const struct timespec *abs_timeout);
246 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
248 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
250 static void mqueue_send_notification(struct mqueue *mq);
251 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
252 static void mq_proc_exit(void *arg, struct proc *p);
257 static void filt_mqdetach(struct knote *kn);
258 static int filt_mqread(struct knote *kn, long hint);
259 static int filt_mqwrite(struct knote *kn, long hint);
261 struct filterops mq_rfiltops = {
263 .f_detach = filt_mqdetach,
264 .f_event = filt_mqread,
266 struct filterops mq_wfiltops = {
268 .f_detach = filt_mqdetach,
269 .f_event = filt_mqwrite,
273 * Initialize fileno bitmap
276 mqfs_fileno_init(struct mqfs_info *mi)
280 up = new_unrhdr(1, INT_MAX, NULL);
285 * Tear down fileno bitmap
288 mqfs_fileno_uninit(struct mqfs_info *mi)
293 mi->mi_unrhdr = NULL;
298 * Allocate a file number
301 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
303 /* make sure our parent has a file number */
304 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
305 mqfs_fileno_alloc(mi, mn->mn_parent);
307 switch (mn->mn_type) {
311 case mqfstype_symlink:
312 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
315 KASSERT(mn->mn_parent != NULL,
316 ("mqfstype_this node has no parent"));
317 mn->mn_fileno = mn->mn_parent->mn_fileno;
319 case mqfstype_parent:
320 KASSERT(mn->mn_parent != NULL,
321 ("mqfstype_parent node has no parent"));
322 if (mn->mn_parent == mi->mi_root) {
323 mn->mn_fileno = mn->mn_parent->mn_fileno;
326 KASSERT(mn->mn_parent->mn_parent != NULL,
327 ("mqfstype_parent node has no grandparent"));
328 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
332 ("mqfs_fileno_alloc() called for unknown type node: %d",
339 * Release a file number
342 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
344 switch (mn->mn_type) {
348 case mqfstype_symlink:
349 free_unr(mi->mi_unrhdr, mn->mn_fileno);
352 case mqfstype_parent:
353 /* ignore these, as they don't "own" their file number */
357 ("mqfs_fileno_free() called for unknown type node: %d",
363 static __inline struct mqfs_node *
366 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
370 mqnode_free(struct mqfs_node *node)
372 uma_zfree(mqnode_zone, node);
376 mqnode_addref(struct mqfs_node *node)
378 atomic_fetchadd_int(&node->mn_refcount, 1);
382 mqnode_release(struct mqfs_node *node)
384 struct mqfs_info *mqfs;
387 mqfs = node->mn_info;
388 old = atomic_fetchadd_int(&node->mn_refcount, -1);
389 if (node->mn_type == mqfstype_dir ||
390 node->mn_type == mqfstype_root)
391 exp = 3; /* include . and .. */
395 int locked = sx_xlocked(&mqfs->mi_lock);
397 sx_xlock(&mqfs->mi_lock);
400 sx_xunlock(&mqfs->mi_lock);
405 * Add a node to a directory
408 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
410 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
411 KASSERT(parent->mn_info != NULL,
412 ("%s(): parent has no mn_info", __func__));
413 KASSERT(parent->mn_type == mqfstype_dir ||
414 parent->mn_type == mqfstype_root,
415 ("%s(): parent is not a directory", __func__));
417 node->mn_info = parent->mn_info;
418 node->mn_parent = parent;
419 LIST_INIT(&node->mn_children);
420 LIST_INIT(&node->mn_vnodes);
421 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
422 mqnode_addref(parent);
426 static struct mqfs_node *
427 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
430 struct mqfs_node *node;
432 node = mqnode_alloc();
433 strncpy(node->mn_name, name, namelen);
434 node->mn_type = nodetype;
435 node->mn_refcount = 1;
436 vfs_timestamp(&node->mn_birth);
437 node->mn_ctime = node->mn_atime = node->mn_mtime
439 node->mn_uid = cred->cr_uid;
440 node->mn_gid = cred->cr_gid;
441 node->mn_mode = mode;
448 static struct mqfs_node *
449 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
450 struct ucred *cred, int mode)
452 struct mqfs_node *node;
454 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
455 if (mqfs_add_node(parent, node) != 0) {
463 * Add . and .. to a directory
466 mqfs_fixup_dir(struct mqfs_node *parent)
468 struct mqfs_node *dir;
470 dir = mqnode_alloc();
471 dir->mn_name[0] = '.';
472 dir->mn_type = mqfstype_this;
473 dir->mn_refcount = 1;
474 if (mqfs_add_node(parent, dir) != 0) {
479 dir = mqnode_alloc();
480 dir->mn_name[0] = dir->mn_name[1] = '.';
481 dir->mn_type = mqfstype_parent;
482 dir->mn_refcount = 1;
484 if (mqfs_add_node(parent, dir) != 0) {
497 static struct mqfs_node *
498 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
499 struct ucred *cred, int mode)
501 struct mqfs_node *node;
503 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
504 if (mqfs_add_node(parent, node) != 0) {
509 if (mqfs_fixup_dir(node) != 0) {
519 static struct mqfs_node *
520 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
521 struct ucred *cred, int mode)
523 struct mqfs_node *node;
525 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
526 if (mqfs_add_node(parent, node) != 0) {
536 * Destroy a node or a tree of nodes
539 mqfs_destroy(struct mqfs_node *node)
541 struct mqfs_node *parent;
543 KASSERT(node != NULL,
544 ("%s(): node is NULL", __func__));
545 KASSERT(node->mn_info != NULL,
546 ("%s(): node has no mn_info", __func__));
548 /* destroy children */
549 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
550 while (! LIST_EMPTY(&node->mn_children))
551 mqfs_destroy(LIST_FIRST(&node->mn_children));
553 /* unlink from parent */
554 if ((parent = node->mn_parent) != NULL) {
555 KASSERT(parent->mn_info == node->mn_info,
556 ("%s(): parent has different mn_info", __func__));
557 LIST_REMOVE(node, mn_sibling);
560 if (node->mn_fileno != 0)
561 mqfs_fileno_free(node->mn_info, node);
562 if (node->mn_data != NULL)
563 mqueue_free(node->mn_data);
569 * Mount a mqfs instance
572 mqfs_mount(struct mount *mp)
576 if (mp->mnt_flag & MNT_UPDATE)
579 mp->mnt_data = &mqfs_data;
581 mp->mnt_flag |= MNT_LOCAL;
582 mp->mnt_kern_flag |= MNTK_MPSAFE;
587 vfs_mountedfrom(mp, "mqueue");
588 sbp->f_bsize = PAGE_SIZE;
589 sbp->f_iosize = PAGE_SIZE;
599 * Unmount a mqfs instance
602 mqfs_unmount(struct mount *mp, int mntflags)
606 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
612 * Return a root vnode
615 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
617 struct mqfs_info *mqfs;
620 mqfs = VFSTOMQFS(mp);
621 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
626 * Return filesystem stats
629 mqfs_statfs(struct mount *mp, struct statfs *sbp)
631 /* XXX update statistics */
636 * Initialize a mqfs instance
639 mqfs_init(struct vfsconf *vfc)
641 struct mqfs_node *root;
642 struct mqfs_info *mi;
644 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
645 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
646 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
647 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
648 mvdata_zone = uma_zcreate("mvdata",
649 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
650 NULL, UMA_ALIGN_PTR, 0);
651 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
652 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
654 sx_init(&mi->mi_lock, "mqfs lock");
655 /* set up the root diretory */
656 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
659 LIST_INIT(&root->mn_children);
660 LIST_INIT(&root->mn_vnodes);
662 mqfs_fileno_init(mi);
663 mqfs_fileno_alloc(mi, root);
664 mqfs_fixup_dir(root);
665 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
666 EVENTHANDLER_PRI_ANY);
667 mq_fdclose = mqueue_fdclose;
668 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
673 * Destroy a mqfs instance
676 mqfs_uninit(struct vfsconf *vfc)
678 struct mqfs_info *mi;
682 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
684 mqfs_destroy(mi->mi_root);
686 mqfs_fileno_uninit(mi);
687 sx_destroy(&mi->mi_lock);
688 uma_zdestroy(mqnode_zone);
689 uma_zdestroy(mqueue_zone);
690 uma_zdestroy(mvdata_zone);
691 uma_zdestroy(mqnoti_zone);
699 do_recycle(void *context, int pending __unused)
701 struct vnode *vp = (struct vnode *)context;
703 vrecycle(vp, curthread);
711 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
713 struct mqfs_vdata *vd;
714 struct mqfs_info *mqfs;
715 struct vnode *newvpp;
720 sx_xlock(&mqfs->mi_lock);
721 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
722 if (vd->mv_vnode->v_mount == mp) {
731 sx_xunlock(&mqfs->mi_lock);
732 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
736 sx_xunlock(&mqfs->mi_lock);
738 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
741 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
742 error = insmntque(newvpp, mp);
746 sx_xlock(&mqfs->mi_lock);
748 * Check if it has already been allocated
749 * while we were blocked.
751 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
752 if (vd->mv_vnode->v_mount == mp) {
754 sx_xunlock(&mqfs->mi_lock);
764 vd = uma_zalloc(mvdata_zone, M_WAITOK);
768 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
769 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
771 switch (pn->mn_type) {
773 (*vpp)->v_vflag = VV_ROOT;
777 case mqfstype_parent:
778 (*vpp)->v_type = VDIR;
781 (*vpp)->v_type = VREG;
783 case mqfstype_symlink:
784 (*vpp)->v_type = VLNK;
787 KASSERT(0, ("mqfs_allocf called for null node\n"));
789 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
791 sx_xunlock(&mqfs->mi_lock);
796 * Search a directory entry
798 static struct mqfs_node *
799 mqfs_search(struct mqfs_node *pd, const char *name, int len)
801 struct mqfs_node *pn;
803 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
804 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
805 if (strncmp(pn->mn_name, name, len) == 0 &&
806 pn->mn_name[len] == '\0')
813 * Look up a file or directory.
816 mqfs_lookupx(struct vop_cachedlookup_args *ap)
818 struct componentname *cnp;
819 struct vnode *dvp, **vpp;
820 struct mqfs_node *pd;
821 struct mqfs_node *pn;
822 struct mqfs_info *mqfs;
823 int nameiop, flags, error, namelen;
830 pname = cnp->cn_nameptr;
831 namelen = cnp->cn_namelen;
833 flags = cnp->cn_flags;
834 nameiop = cnp->cn_nameiop;
840 if (dvp->v_type != VDIR)
843 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
847 /* shortcut: check if the name is too long */
848 if (cnp->cn_namelen >= MQFS_NAMELEN)
852 if (namelen == 1 && pname[0] == '.') {
853 if ((flags & ISLASTCN) && nameiop != LOOKUP)
862 if (cnp->cn_flags & ISDOTDOT) {
863 if (dvp->v_vflag & VV_ROOT)
865 if ((flags & ISLASTCN) && nameiop != LOOKUP)
868 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
870 error = mqfs_allocv(dvp->v_mount, vpp, pn);
871 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
876 sx_xlock(&mqfs->mi_lock);
877 pn = mqfs_search(pd, pname, namelen);
880 sx_xunlock(&mqfs->mi_lock);
885 if (nameiop == DELETE && (flags & ISLASTCN)) {
886 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
900 error = mqfs_allocv(dvp->v_mount, vpp, pn);
902 if (error == 0 && cnp->cn_flags & MAKEENTRY)
903 cache_enter(dvp, *vpp, cnp);
909 /* will create a new entry in the directory ? */
910 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
911 && (flags & ISLASTCN)) {
912 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
915 cnp->cn_flags |= SAVENAME;
916 return (EJUSTRETURN);
922 struct vop_lookup_args {
923 struct vop_generic_args a_gen;
925 struct vnode **a_vpp;
926 struct componentname *a_cnp;
931 * vnode lookup operation
934 mqfs_lookup(struct vop_cachedlookup_args *ap)
938 rc = mqfs_lookupx(ap);
943 struct vop_create_args {
945 struct vnode **a_vpp;
946 struct componentname *a_cnp;
952 * vnode creation operation
955 mqfs_create(struct vop_create_args *ap)
957 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
958 struct componentname *cnp = ap->a_cnp;
959 struct mqfs_node *pd;
960 struct mqfs_node *pn;
964 pd = VTON(ap->a_dvp);
965 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
967 mq = mqueue_alloc(NULL);
970 sx_xlock(&mqfs->mi_lock);
971 if ((cnp->cn_flags & HASBUF) == 0)
972 panic("%s: no name", __func__);
973 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
974 cnp->cn_cred, ap->a_vap->va_mode);
976 sx_xunlock(&mqfs->mi_lock);
980 sx_xunlock(&mqfs->mi_lock);
981 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
997 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
999 struct mqfs_node *parent;
1000 struct mqfs_vdata *vd;
1003 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1005 if (ucred->cr_uid != pn->mn_uid &&
1006 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1008 else if (!pn->mn_deleted) {
1009 parent = pn->mn_parent;
1010 pn->mn_parent = NULL;
1012 LIST_REMOVE(pn, mn_sibling);
1013 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1014 cache_purge(vd->mv_vnode);
1015 vhold(vd->mv_vnode);
1016 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1019 mqnode_release(parent);
1026 struct vop_remove_args {
1027 struct vnode *a_dvp;
1029 struct componentname *a_cnp;
1034 * vnode removal operation
1037 mqfs_remove(struct vop_remove_args *ap)
1039 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1040 struct mqfs_node *pn;
1043 if (ap->a_vp->v_type == VDIR)
1045 pn = VTON(ap->a_vp);
1046 sx_xlock(&mqfs->mi_lock);
1047 error = do_unlink(pn, ap->a_cnp->cn_cred);
1048 sx_xunlock(&mqfs->mi_lock);
1053 struct vop_inactive_args {
1055 struct thread *a_td;
1060 mqfs_inactive(struct vop_inactive_args *ap)
1062 struct mqfs_node *pn = VTON(ap->a_vp);
1065 vrecycle(ap->a_vp, ap->a_td);
1070 struct vop_reclaim_args {
1071 struct vop_generic_args a_gen;
1073 struct thread *a_td;
1078 mqfs_reclaim(struct vop_reclaim_args *ap)
1080 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1081 struct vnode *vp = ap->a_vp;
1082 struct mqfs_node *pn;
1083 struct mqfs_vdata *vd;
1087 sx_xlock(&mqfs->mi_lock);
1089 LIST_REMOVE(vd, mv_link);
1090 uma_zfree(mvdata_zone, vd);
1092 sx_xunlock(&mqfs->mi_lock);
1097 struct vop_open_args {
1098 struct vop_generic_args a_gen;
1101 struct ucred *a_cred;
1102 struct thread *a_td;
1108 mqfs_open(struct vop_open_args *ap)
1114 struct vop_close_args {
1115 struct vop_generic_args a_gen;
1118 struct ucred *a_cred;
1119 struct thread *a_td;
1124 mqfs_close(struct vop_close_args *ap)
1130 struct vop_access_args {
1131 struct vop_generic_args a_gen;
1133 accmode_t a_accmode;
1134 struct ucred *a_cred;
1135 struct thread *a_td;
1140 * Verify permissions
1143 mqfs_access(struct vop_access_args *ap)
1145 struct vnode *vp = ap->a_vp;
1149 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1152 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1153 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1158 struct vop_getattr_args {
1159 struct vop_generic_args a_gen;
1161 struct vattr *a_vap;
1162 struct ucred *a_cred;
1167 * Get file attributes
1170 mqfs_getattr(struct vop_getattr_args *ap)
1172 struct vnode *vp = ap->a_vp;
1173 struct mqfs_node *pn = VTON(vp);
1174 struct vattr *vap = ap->a_vap;
1177 vap->va_type = vp->v_type;
1178 vap->va_mode = pn->mn_mode;
1180 vap->va_uid = pn->mn_uid;
1181 vap->va_gid = pn->mn_gid;
1182 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1183 vap->va_fileid = pn->mn_fileno;
1185 vap->va_blocksize = PAGE_SIZE;
1186 vap->va_bytes = vap->va_size = 0;
1187 vap->va_atime = pn->mn_atime;
1188 vap->va_mtime = pn->mn_mtime;
1189 vap->va_ctime = pn->mn_ctime;
1190 vap->va_birthtime = pn->mn_birth;
1193 vap->va_rdev = NODEV;
1195 vap->va_filerev = 0;
1200 struct vop_setattr_args {
1201 struct vop_generic_args a_gen;
1203 struct vattr *a_vap;
1204 struct ucred *a_cred;
1211 mqfs_setattr(struct vop_setattr_args *ap)
1213 struct mqfs_node *pn;
1224 if ((vap->va_type != VNON) ||
1225 (vap->va_nlink != VNOVAL) ||
1226 (vap->va_fsid != VNOVAL) ||
1227 (vap->va_fileid != VNOVAL) ||
1228 (vap->va_blocksize != VNOVAL) ||
1229 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1230 (vap->va_rdev != VNOVAL) ||
1231 ((int)vap->va_bytes != VNOVAL) ||
1232 (vap->va_gen != VNOVAL)) {
1239 if (vap->va_uid == (uid_t)VNOVAL)
1243 if (vap->va_gid == (gid_t)VNOVAL)
1248 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1250 * To modify the ownership of a file, must possess VADMIN
1253 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1257 * XXXRW: Why is there a privilege check here: shouldn't the
1258 * check in VOP_ACCESS() be enough? Also, are the group bits
1259 * below definitely right?
1261 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1262 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1263 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1270 if (vap->va_mode != (mode_t)VNOVAL) {
1271 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1272 (error = priv_check(td, PRIV_MQ_ADMIN)))
1274 pn->mn_mode = vap->va_mode;
1278 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1279 /* See the comment in ufs_vnops::ufs_setattr(). */
1280 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1281 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1282 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1284 if (vap->va_atime.tv_sec != VNOVAL) {
1285 pn->mn_atime = vap->va_atime;
1287 if (vap->va_mtime.tv_sec != VNOVAL) {
1288 pn->mn_mtime = vap->va_mtime;
1293 vfs_timestamp(&pn->mn_ctime);
1299 struct vop_read_args {
1300 struct vop_generic_args a_gen;
1304 struct ucred *a_cred;
1312 mqfs_read(struct vop_read_args *ap)
1315 struct vnode *vp = ap->a_vp;
1316 struct uio *uio = ap->a_uio;
1317 struct mqfs_node *pn;
1321 if (vp->v_type != VREG)
1326 snprintf(buf, sizeof(buf),
1327 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1332 buf[sizeof(buf)-1] = '\0';
1334 error = uiomove_frombuf(buf, len, uio);
1339 struct vop_readdir_args {
1340 struct vop_generic_args a_gen;
1343 struct ucred *a_cred;
1351 * Return directory entries.
1354 mqfs_readdir(struct vop_readdir_args *ap)
1357 struct mqfs_info *mi;
1358 struct mqfs_node *pd;
1359 struct mqfs_node *pn;
1360 struct dirent entry;
1362 int *tmp_ncookies = NULL;
1367 mi = VFSTOMQFS(vp->v_mount);
1371 if (vp->v_type != VDIR)
1374 if (uio->uio_offset < 0)
1377 if (ap->a_ncookies != NULL) {
1378 tmp_ncookies = ap->a_ncookies;
1379 *ap->a_ncookies = 0;
1380 ap->a_ncookies = NULL;
1386 sx_xlock(&mi->mi_lock);
1388 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1389 entry.d_reclen = sizeof(entry);
1391 mqfs_fileno_alloc(mi, pn);
1392 entry.d_fileno = pn->mn_fileno;
1393 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1394 entry.d_name[i] = pn->mn_name[i];
1395 entry.d_name[i] = 0;
1397 switch (pn->mn_type) {
1401 case mqfstype_parent:
1402 entry.d_type = DT_DIR;
1405 entry.d_type = DT_REG;
1407 case mqfstype_symlink:
1408 entry.d_type = DT_LNK;
1411 panic("%s has unexpected node type: %d", pn->mn_name,
1414 if (entry.d_reclen > uio->uio_resid)
1416 if (offset >= uio->uio_offset) {
1417 error = vfs_read_dirent(ap, &entry, offset);
1421 offset += entry.d_reclen;
1423 sx_xunlock(&mi->mi_lock);
1425 uio->uio_offset = offset;
1427 if (tmp_ncookies != NULL)
1428 ap->a_ncookies = tmp_ncookies;
1436 struct vop_mkdir_args {
1437 struct vnode *a_dvp;
1438 struvt vnode **a_vpp;
1439 struvt componentname *a_cnp;
1440 struct vattr *a_vap;
1445 * Create a directory.
1448 mqfs_mkdir(struct vop_mkdir_args *ap)
1450 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1451 struct componentname *cnp = ap->a_cnp;
1452 struct mqfs_node *pd = VTON(ap->a_dvp);
1453 struct mqfs_node *pn;
1456 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1458 sx_xlock(&mqfs->mi_lock);
1459 if ((cnp->cn_flags & HASBUF) == 0)
1460 panic("%s: no name", __func__);
1461 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1462 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1465 sx_xunlock(&mqfs->mi_lock);
1469 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1476 struct vop_rmdir_args {
1477 struct vnode *a_dvp;
1479 struct componentname *a_cnp;
1484 * Remove a directory.
1487 mqfs_rmdir(struct vop_rmdir_args *ap)
1489 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1490 struct mqfs_node *pn = VTON(ap->a_vp);
1491 struct mqfs_node *pt;
1493 if (pn->mn_type != mqfstype_dir)
1496 sx_xlock(&mqfs->mi_lock);
1497 if (pn->mn_deleted) {
1498 sx_xunlock(&mqfs->mi_lock);
1502 pt = LIST_FIRST(&pn->mn_children);
1503 pt = LIST_NEXT(pt, mn_sibling);
1504 pt = LIST_NEXT(pt, mn_sibling);
1506 sx_xunlock(&mqfs->mi_lock);
1510 pn->mn_parent = NULL;
1512 LIST_REMOVE(pn, mn_sibling);
1515 sx_xunlock(&mqfs->mi_lock);
1516 cache_purge(ap->a_vp);
1523 * Allocate a message queue
1525 static struct mqueue *
1526 mqueue_alloc(const struct mq_attr *attr)
1532 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1533 TAILQ_INIT(&mq->mq_msgq);
1535 mq->mq_maxmsg = attr->mq_maxmsg;
1536 mq->mq_msgsize = attr->mq_msgsize;
1538 mq->mq_maxmsg = default_maxmsg;
1539 mq->mq_msgsize = default_msgsize;
1541 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1542 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1543 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1544 atomic_add_int(&curmq, 1);
1549 * Destroy a message queue
1552 mqueue_free(struct mqueue *mq)
1554 struct mqueue_msg *msg;
1556 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1557 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1558 free(msg, M_MQUEUEDATA);
1561 mtx_destroy(&mq->mq_mutex);
1562 knlist_destroy(&mq->mq_rsel.si_note);
1563 knlist_destroy(&mq->mq_wsel.si_note);
1564 uma_zfree(mqueue_zone, mq);
1565 atomic_add_int(&curmq, -1);
1569 * Load a message from user space
1571 static struct mqueue_msg *
1572 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1574 struct mqueue_msg *msg;
1578 len = sizeof(struct mqueue_msg) + msg_size;
1579 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1580 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1583 free(msg, M_MQUEUEDATA);
1586 msg->msg_size = msg_size;
1587 msg->msg_prio = msg_prio;
1593 * Save a message to user space
1596 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1600 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1602 if (error == 0 && msg_prio != NULL)
1603 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1608 * Free a message's memory
1610 static __inline void
1611 mqueue_freemsg(struct mqueue_msg *msg)
1613 free(msg, M_MQUEUEDATA);
1617 * Send a message. if waitok is false, thread will not be
1618 * blocked if there is no data in queue, otherwise, absolute
1619 * time will be checked.
1622 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1623 size_t msg_len, unsigned msg_prio, int waitok,
1624 const struct timespec *abs_timeout)
1626 struct mqueue_msg *msg;
1627 struct timespec ts, ts2;
1631 if (msg_prio >= MQ_PRIO_MAX)
1633 if (msg_len > mq->mq_msgsize)
1635 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1639 /* O_NONBLOCK case */
1641 error = _mqueue_send(mq, msg, -1);
1647 /* we allow a null timeout (wait forever) */
1648 if (abs_timeout == NULL) {
1649 error = _mqueue_send(mq, msg, 0);
1655 /* send it before checking time */
1656 error = _mqueue_send(mq, msg, -1);
1660 if (error != EAGAIN)
1663 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1670 timespecsub(&ts2, &ts);
1671 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1675 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1676 error = _mqueue_send(mq, msg, tvtohz(&tv));
1677 if (error != ETIMEDOUT)
1683 mqueue_freemsg(msg);
1688 * Common routine to send a message
1691 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1693 struct mqueue_msg *msg2;
1696 mtx_lock(&mq->mq_mutex);
1697 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1699 mtx_unlock(&mq->mq_mutex);
1703 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1704 PCATCH, "mqsend", timo);
1706 if (error == EAGAIN)
1709 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1710 mtx_unlock(&mq->mq_mutex);
1714 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1715 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1717 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1718 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1720 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1721 if (msg2->msg_prio < msg->msg_prio)
1724 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1728 mq->mq_totalbytes += msg->msg_size;
1729 if (mq->mq_receivers)
1730 wakeup_one(&mq->mq_receivers);
1731 else if (mq->mq_notifier != NULL)
1732 mqueue_send_notification(mq);
1733 if (mq->mq_flags & MQ_RSEL) {
1734 mq->mq_flags &= ~MQ_RSEL;
1735 selwakeup(&mq->mq_rsel);
1737 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1738 mtx_unlock(&mq->mq_mutex);
1743 * Send realtime a signal to process which registered itself
1744 * successfully by mq_notify.
1747 mqueue_send_notification(struct mqueue *mq)
1749 struct mqueue_notifier *nt;
1754 mtx_assert(&mq->mq_mutex, MA_OWNED);
1755 nt = mq->mq_notifier;
1756 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1758 error = sigev_findtd(p, &nt->nt_sigev, &td);
1760 mq->mq_notifier = NULL;
1763 if (!KSI_ONQ(&nt->nt_ksi)) {
1764 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1765 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1769 mq->mq_notifier = NULL;
1773 * Get a message. if waitok is false, thread will not be
1774 * blocked if there is no data in queue, otherwise, absolute
1775 * time will be checked.
1778 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1779 size_t msg_len, unsigned *msg_prio, int waitok,
1780 const struct timespec *abs_timeout)
1782 struct mqueue_msg *msg;
1783 struct timespec ts, ts2;
1787 if (msg_len < mq->mq_msgsize)
1790 /* O_NONBLOCK case */
1792 error = _mqueue_recv(mq, &msg, -1);
1798 /* we allow a null timeout (wait forever). */
1799 if (abs_timeout == NULL) {
1800 error = _mqueue_recv(mq, &msg, 0);
1806 /* try to get a message before checking time */
1807 error = _mqueue_recv(mq, &msg, -1);
1811 if (error != EAGAIN)
1814 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1822 timespecsub(&ts2, &ts);
1823 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1827 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1828 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1831 if (error != ETIMEDOUT)
1836 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1838 curthread->td_retval[0] = msg->msg_size;
1839 curthread->td_retval[1] = 0;
1841 mqueue_freemsg(msg);
1846 * Common routine to receive a message
1849 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1853 mtx_lock(&mq->mq_mutex);
1854 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1856 mtx_unlock(&mq->mq_mutex);
1860 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1861 PCATCH, "mqrecv", timo);
1863 if (error == EAGAIN)
1868 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1870 mq->mq_totalbytes -= (*msg)->msg_size;
1872 wakeup_one(&mq->mq_senders);
1873 if (mq->mq_flags & MQ_WSEL) {
1874 mq->mq_flags &= ~MQ_WSEL;
1875 selwakeup(&mq->mq_wsel);
1877 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1879 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1880 !TAILQ_EMPTY(&mq->mq_msgq)) {
1881 mqueue_send_notification(mq);
1883 mtx_unlock(&mq->mq_mutex);
1887 static __inline struct mqueue_notifier *
1888 notifier_alloc(void)
1890 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1893 static __inline void
1894 notifier_free(struct mqueue_notifier *p)
1896 uma_zfree(mqnoti_zone, p);
1899 static struct mqueue_notifier *
1900 notifier_search(struct proc *p, int fd)
1902 struct mqueue_notifier *nt;
1904 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1905 if (nt->nt_ksi.ksi_mqd == fd)
1911 static __inline void
1912 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1914 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1917 static __inline void
1918 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1920 LIST_REMOVE(nt, nt_link);
1925 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1927 struct mqueue_notifier *nt;
1929 mtx_assert(&mq->mq_mutex, MA_OWNED);
1931 nt = notifier_search(p, fd);
1933 if (mq->mq_notifier == nt)
1934 mq->mq_notifier = NULL;
1935 sigqueue_take(&nt->nt_ksi);
1936 notifier_delete(p, nt);
1942 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
1943 const struct mq_attr *attr)
1945 char path[MQFS_NAMELEN + 1];
1946 struct mqfs_node *pn;
1947 struct filedesc *fdp;
1950 int fd, error, len, cmode;
1952 fdp = td->td_proc->p_fd;
1953 cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
1955 if ((flags & O_CREAT) != 0 && attr != NULL) {
1956 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
1958 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
1962 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
1967 * The first character of name must be a slash (/) character
1968 * and the remaining characters of name cannot include any slash
1972 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
1975 error = falloc(td, &fp, &fd);
1979 sx_xlock(&mqfs_data.mi_lock);
1980 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
1982 if (!(flags & O_CREAT)) {
1985 mq = mqueue_alloc(attr);
1989 pn = mqfs_create_file(mqfs_data.mi_root,
1990 path + 1, len - 1, td->td_ucred,
2003 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2006 accmode_t accmode = 0;
2012 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2013 pn->mn_gid, accmode, td->td_ucred, NULL);
2018 sx_xunlock(&mqfs_data.mi_lock);
2019 fdclose(fdp, fp, fd, td);
2025 sx_xunlock(&mqfs_data.mi_lock);
2027 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2030 FILEDESC_XLOCK(fdp);
2031 if (fdp->fd_ofiles[fd] == fp)
2032 fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
2033 FILEDESC_XUNLOCK(fdp);
2034 td->td_retval[0] = fd;
2040 * Syscall to open a message queue.
2043 kmq_open(struct thread *td, struct kmq_open_args *uap)
2045 struct mq_attr attr;
2048 if ((uap->flags & O_ACCMODE) == O_ACCMODE)
2050 flags = FFLAGS(uap->flags);
2051 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2052 error = copyin(uap->attr, &attr, sizeof(attr));
2056 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2057 uap->attr != NULL ? &attr : NULL));
2061 * Syscall to unlink a message queue.
2064 kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2066 char path[MQFS_NAMELEN+1];
2067 struct mqfs_node *pn;
2070 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2075 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
2078 sx_xlock(&mqfs_data.mi_lock);
2079 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
2081 error = do_unlink(pn, td->td_ucred);
2084 sx_xunlock(&mqfs_data.mi_lock);
2088 typedef int (*_fgetf)(struct thread *, int, struct file **);
2091 * Get message queue by giving file slot
2094 _getmq(struct thread *td, int fd, _fgetf func,
2095 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2097 struct mqfs_node *pn;
2100 error = func(td, fd, fpp);
2103 if (&mqueueops != (*fpp)->f_ops) {
2107 pn = (*fpp)->f_data;
2116 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2117 struct mqueue **pmq)
2119 return _getmq(td, fd, fget, fpp, ppn, pmq);
2123 getmq_read(struct thread *td, int fd, struct file **fpp,
2124 struct mqfs_node **ppn, struct mqueue **pmq)
2126 return _getmq(td, fd, fget_read, fpp, ppn, pmq);
2130 getmq_write(struct thread *td, int fd, struct file **fpp,
2131 struct mqfs_node **ppn, struct mqueue **pmq)
2133 return _getmq(td, fd, fget_write, fpp, ppn, pmq);
2137 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2138 struct mq_attr *oattr)
2145 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2147 error = getmq(td, mqd, &fp, NULL, &mq);
2150 oattr->mq_maxmsg = mq->mq_maxmsg;
2151 oattr->mq_msgsize = mq->mq_msgsize;
2152 oattr->mq_curmsgs = mq->mq_curmsgs;
2155 oflag = flag = fp->f_flag;
2156 flag &= ~O_NONBLOCK;
2157 flag |= (attr->mq_flags & O_NONBLOCK);
2158 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2161 oattr->mq_flags = (O_NONBLOCK & oflag);
2167 kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2169 struct mq_attr attr, oattr;
2172 if (uap->attr != NULL) {
2173 error = copyin(uap->attr, &attr, sizeof(attr));
2177 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2181 if (uap->oattr != NULL)
2182 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2187 kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2191 struct timespec *abs_timeout, ets;
2195 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2198 if (uap->abs_timeout != NULL) {
2199 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2205 waitok = !(fp->f_flag & O_NONBLOCK);
2206 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2207 uap->msg_prio, waitok, abs_timeout);
2213 kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2217 struct timespec *abs_timeout, ets;
2220 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2223 if (uap->abs_timeout != NULL) {
2224 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2230 waitok = !(fp->f_flag & O_NONBLOCK);
2231 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2232 uap->msg_prio, waitok, abs_timeout);
2238 kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2241 struct filedesc *fdp;
2245 struct mqueue_notifier *nt, *newnt = NULL;
2249 fdp = td->td_proc->p_fd;
2251 error = copyin(uap->sigev, &ev, sizeof(ev));
2254 if (ev.sigev_notify != SIGEV_SIGNAL &&
2255 ev.sigev_notify != SIGEV_THREAD_ID &&
2256 ev.sigev_notify != SIGEV_NONE)
2258 if ((ev.sigev_notify == SIGEV_SIGNAL ||
2259 ev.sigev_notify == SIGEV_THREAD_ID) &&
2260 !_SIG_VALID(ev.sigev_signo))
2263 error = getmq(td, uap->mqd, &fp, NULL, &mq);
2267 FILEDESC_SLOCK(fdp);
2268 if (fget_locked(fdp, uap->mqd) != fp) {
2269 FILEDESC_SUNLOCK(fdp);
2273 mtx_lock(&mq->mq_mutex);
2274 FILEDESC_SUNLOCK(fdp);
2275 if (uap->sigev != NULL) {
2276 if (mq->mq_notifier != NULL) {
2280 nt = notifier_search(p, uap->mqd);
2282 if (newnt == NULL) {
2284 mtx_unlock(&mq->mq_mutex);
2285 newnt = notifier_alloc();
2291 sigqueue_take(&nt->nt_ksi);
2292 if (newnt != NULL) {
2293 notifier_free(newnt);
2299 ksiginfo_init(&nt->nt_ksi);
2300 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2301 nt->nt_ksi.ksi_code = SI_MESGQ;
2303 nt->nt_ksi.ksi_mqd = uap->mqd;
2304 notifier_insert(p, nt);
2307 mq->mq_notifier = nt;
2310 * if there is no receivers and message queue
2311 * is not empty, we should send notification
2312 * as soon as possible.
2314 if (mq->mq_receivers == 0 &&
2315 !TAILQ_EMPTY(&mq->mq_msgq))
2316 mqueue_send_notification(mq);
2319 notifier_remove(p, mq, uap->mqd);
2321 mtx_unlock(&mq->mq_mutex);
2326 notifier_free(newnt);
2331 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2333 struct filedesc *fdp;
2336 fdp = td->td_proc->p_fd;
2337 FILEDESC_LOCK_ASSERT(fdp);
2339 if (fp->f_ops == &mqueueops) {
2341 mtx_lock(&mq->mq_mutex);
2342 notifier_remove(td->td_proc, mq, fd);
2344 /* have to wakeup thread in same process */
2345 if (mq->mq_flags & MQ_RSEL) {
2346 mq->mq_flags &= ~MQ_RSEL;
2347 selwakeup(&mq->mq_rsel);
2349 if (mq->mq_flags & MQ_WSEL) {
2350 mq->mq_flags &= ~MQ_WSEL;
2351 selwakeup(&mq->mq_wsel);
2353 mtx_unlock(&mq->mq_mutex);
2358 mq_proc_exit(void *arg __unused, struct proc *p)
2360 struct filedesc *fdp;
2366 FILEDESC_SLOCK(fdp);
2367 for (i = 0; i < fdp->fd_nfiles; ++i) {
2368 fp = fget_locked(fdp, i);
2369 if (fp != NULL && fp->f_ops == &mqueueops) {
2371 mtx_lock(&mq->mq_mutex);
2372 notifier_remove(p, FPTOMQ(fp), i);
2373 mtx_unlock(&mq->mq_mutex);
2376 FILEDESC_SUNLOCK(fdp);
2377 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2381 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
2382 int flags, struct thread *td)
2384 return (EOPNOTSUPP);
2388 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
2389 int flags, struct thread *td)
2391 return (EOPNOTSUPP);
2395 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred,
2403 mqf_ioctl(struct file *fp, u_long cmd, void *data,
2404 struct ucred *active_cred, struct thread *td)
2410 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2413 struct mqueue *mq = FPTOMQ(fp);
2416 mtx_lock(&mq->mq_mutex);
2417 if (events & (POLLIN | POLLRDNORM)) {
2418 if (mq->mq_curmsgs) {
2419 revents |= events & (POLLIN | POLLRDNORM);
2421 mq->mq_flags |= MQ_RSEL;
2422 selrecord(td, &mq->mq_rsel);
2425 if (events & POLLOUT) {
2426 if (mq->mq_curmsgs < mq->mq_maxmsg)
2429 mq->mq_flags |= MQ_WSEL;
2430 selrecord(td, &mq->mq_wsel);
2433 mtx_unlock(&mq->mq_mutex);
2438 mqf_close(struct file *fp, struct thread *td)
2440 struct mqfs_node *pn;
2442 fp->f_ops = &badfileops;
2445 sx_xlock(&mqfs_data.mi_lock);
2447 sx_xunlock(&mqfs_data.mi_lock);
2452 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2455 struct mqfs_node *pn = fp->f_data;
2457 bzero(st, sizeof *st);
2458 st->st_atim = pn->mn_atime;
2459 st->st_mtim = pn->mn_mtime;
2460 st->st_ctim = pn->mn_ctime;
2461 st->st_birthtim = pn->mn_birth;
2462 st->st_uid = pn->mn_uid;
2463 st->st_gid = pn->mn_gid;
2464 st->st_mode = S_IFIFO | pn->mn_mode;
2469 mqf_kqfilter(struct file *fp, struct knote *kn)
2471 struct mqueue *mq = FPTOMQ(fp);
2474 if (kn->kn_filter == EVFILT_READ) {
2475 kn->kn_fop = &mq_rfiltops;
2476 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2477 } else if (kn->kn_filter == EVFILT_WRITE) {
2478 kn->kn_fop = &mq_wfiltops;
2479 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2486 filt_mqdetach(struct knote *kn)
2488 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2490 if (kn->kn_filter == EVFILT_READ)
2491 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2492 else if (kn->kn_filter == EVFILT_WRITE)
2493 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2495 panic("filt_mqdetach");
2499 filt_mqread(struct knote *kn, long hint)
2501 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2503 mtx_assert(&mq->mq_mutex, MA_OWNED);
2504 return (mq->mq_curmsgs != 0);
2508 filt_mqwrite(struct knote *kn, long hint)
2510 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2512 mtx_assert(&mq->mq_mutex, MA_OWNED);
2513 return (mq->mq_curmsgs < mq->mq_maxmsg);
2516 static struct fileops mqueueops = {
2517 .fo_read = mqf_read,
2518 .fo_write = mqf_write,
2519 .fo_truncate = mqf_truncate,
2520 .fo_ioctl = mqf_ioctl,
2521 .fo_poll = mqf_poll,
2522 .fo_kqfilter = mqf_kqfilter,
2523 .fo_stat = mqf_stat,
2524 .fo_close = mqf_close
2527 static struct vop_vector mqfs_vnodeops = {
2528 .vop_default = &default_vnodeops,
2529 .vop_access = mqfs_access,
2530 .vop_cachedlookup = mqfs_lookup,
2531 .vop_lookup = vfs_cache_lookup,
2532 .vop_reclaim = mqfs_reclaim,
2533 .vop_create = mqfs_create,
2534 .vop_remove = mqfs_remove,
2535 .vop_inactive = mqfs_inactive,
2536 .vop_open = mqfs_open,
2537 .vop_close = mqfs_close,
2538 .vop_getattr = mqfs_getattr,
2539 .vop_setattr = mqfs_setattr,
2540 .vop_read = mqfs_read,
2541 .vop_write = VOP_EOPNOTSUPP,
2542 .vop_readdir = mqfs_readdir,
2543 .vop_mkdir = VOP_EOPNOTSUPP,
2544 .vop_rmdir = VOP_EOPNOTSUPP
2547 static struct vfsops mqfs_vfsops = {
2548 .vfs_init = mqfs_init,
2549 .vfs_uninit = mqfs_uninit,
2550 .vfs_mount = mqfs_mount,
2551 .vfs_unmount = mqfs_unmount,
2552 .vfs_root = mqfs_root,
2553 .vfs_statfs = mqfs_statfs,
2556 static struct vfsconf mqueuefs_vfsconf = {
2557 .vfc_version = VFS_VERSION,
2558 .vfc_name = "mqueuefs",
2559 .vfc_vfsops = &mqfs_vfsops,
2561 .vfc_flags = VFCF_SYNTHETIC
2564 static struct syscall_helper_data mq_syscalls[] = {
2565 SYSCALL_INIT_HELPER(kmq_open),
2566 SYSCALL_INIT_HELPER(kmq_setattr),
2567 SYSCALL_INIT_HELPER(kmq_timedsend),
2568 SYSCALL_INIT_HELPER(kmq_timedreceive),
2569 SYSCALL_INIT_HELPER(kmq_notify),
2570 SYSCALL_INIT_HELPER(kmq_unlink),
2574 #ifdef COMPAT_FREEBSD32
2575 #include <compat/freebsd32/freebsd32.h>
2576 #include <compat/freebsd32/freebsd32_proto.h>
2577 #include <compat/freebsd32/freebsd32_syscall.h>
2578 #include <compat/freebsd32/freebsd32_util.h>
2581 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2584 to->mq_flags = from->mq_flags;
2585 to->mq_maxmsg = from->mq_maxmsg;
2586 to->mq_msgsize = from->mq_msgsize;
2587 to->mq_curmsgs = from->mq_curmsgs;
2591 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2594 to->mq_flags = from->mq_flags;
2595 to->mq_maxmsg = from->mq_maxmsg;
2596 to->mq_msgsize = from->mq_msgsize;
2597 to->mq_curmsgs = from->mq_curmsgs;
2601 freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
2603 struct mq_attr attr;
2604 struct mq_attr32 attr32;
2607 if ((uap->flags & O_ACCMODE) == O_ACCMODE)
2609 flags = FFLAGS(uap->flags);
2610 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2611 error = copyin(uap->attr, &attr32, sizeof(attr32));
2614 mq_attr_from32(&attr32, &attr);
2616 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2617 uap->attr != NULL ? &attr : NULL));
2621 freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
2623 struct mq_attr attr, oattr;
2624 struct mq_attr32 attr32, oattr32;
2627 if (uap->attr != NULL) {
2628 error = copyin(uap->attr, &attr32, sizeof(attr32));
2631 mq_attr_from32(&attr32, &attr);
2633 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2637 if (uap->oattr != NULL) {
2638 mq_attr_to32(&oattr, &oattr32);
2639 error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2645 freebsd32_kmq_timedsend(struct thread *td,
2646 struct freebsd32_kmq_timedsend_args *uap)
2650 struct timespec32 ets32;
2651 struct timespec *abs_timeout, ets;
2655 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2658 if (uap->abs_timeout != NULL) {
2659 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2662 CP(ets32, ets, tv_sec);
2663 CP(ets32, ets, tv_nsec);
2667 waitok = !(fp->f_flag & O_NONBLOCK);
2668 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2669 uap->msg_prio, waitok, abs_timeout);
2675 freebsd32_kmq_timedreceive(struct thread *td,
2676 struct freebsd32_kmq_timedreceive_args *uap)
2680 struct timespec32 ets32;
2681 struct timespec *abs_timeout, ets;
2684 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2687 if (uap->abs_timeout != NULL) {
2688 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2691 CP(ets32, ets, tv_sec);
2692 CP(ets32, ets, tv_nsec);
2696 waitok = !(fp->f_flag & O_NONBLOCK);
2697 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2698 uap->msg_prio, waitok, abs_timeout);
2703 static struct syscall_helper_data mq32_syscalls[] = {
2704 SYSCALL32_INIT_HELPER(freebsd32_kmq_open),
2705 SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr),
2706 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend),
2707 SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive),
2708 SYSCALL32_INIT_HELPER(kmq_notify),
2709 SYSCALL32_INIT_HELPER(kmq_unlink),
2719 error = syscall_helper_register(mq_syscalls);
2722 #ifdef COMPAT_FREEBSD32
2723 error = syscall32_helper_register(mq32_syscalls);
2734 #ifdef COMPAT_FREEBSD32
2735 syscall32_helper_unregister(mq32_syscalls);
2737 syscall_helper_unregister(mq_syscalls);
2742 mq_modload(struct module *module, int cmd, void *arg)
2746 error = vfs_modevent(module, cmd, arg);
2765 static moduledata_t mqueuefs_mod = {
2770 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
2771 MODULE_VERSION(mqueuefs, 1);