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 <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/systm.h>
51 #include <sys/limits.h>
53 #include <sys/dirent.h>
54 #include <sys/event.h>
55 #include <sys/eventhandler.h>
56 #include <sys/fcntl.h>
58 #include <sys/filedesc.h>
60 #include <sys/malloc.h>
61 #include <sys/module.h>
62 #include <sys/mount.h>
63 #include <sys/mqueue.h>
64 #include <sys/mutex.h>
65 #include <sys/namei.h>
66 #include <sys/posix4.h>
70 #include <sys/queue.h>
71 #include <sys/sysproto.h>
73 #include <sys/syscall.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysent.h>
77 #include <sys/sysctl.h>
78 #include <sys/taskqueue.h>
79 #include <sys/unistd.h>
80 #include <sys/vnode.h>
81 #include <machine/atomic.h>
84 * Limits and constants
86 #define MQFS_NAMELEN NAME_MAX
87 #define MQFS_DELEN (8 + MQFS_NAMELEN)
103 * mqfs_info: describes a mqfs instance
107 struct mqfs_node *mi_root;
108 struct unrhdr *mi_unrhdr;
112 LIST_ENTRY(mqfs_vdata) mv_link;
113 struct mqfs_node *mv_node;
114 struct vnode *mv_vnode;
119 * mqfs_node: describes a node (file or directory) within a mqfs
122 char mn_name[MQFS_NAMELEN+1];
123 struct mqfs_info *mn_info;
124 struct mqfs_node *mn_parent;
125 LIST_HEAD(,mqfs_node) mn_children;
126 LIST_ENTRY(mqfs_node) mn_sibling;
127 LIST_HEAD(,mqfs_vdata) mn_vnodes;
133 struct timespec mn_birth;
134 struct timespec mn_ctime;
135 struct timespec mn_atime;
136 struct timespec mn_mtime;
142 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
143 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
144 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
145 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
146 (fp)->f_data)->mn_data))
148 TAILQ_HEAD(msgq, mqueue_msg);
152 struct mqueue_notifier {
153 LIST_ENTRY(mqueue_notifier) nt_link;
154 struct sigevent nt_sigev;
156 struct proc *nt_proc;
169 struct selinfo mq_rsel;
170 struct selinfo mq_wsel;
171 struct mqueue_notifier *mq_notifier;
178 TAILQ_ENTRY(mqueue_msg) msg_link;
179 unsigned int msg_prio;
180 unsigned int msg_size;
181 /* following real data... */
184 SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
185 "POSIX real time message queue");
187 static int default_maxmsg = 10;
188 static int default_msgsize = 1024;
190 static int maxmsg = 100;
191 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
192 &maxmsg, 0, "Default maximum messages in queue");
193 static int maxmsgsize = 16384;
194 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
195 &maxmsgsize, 0, "Default maximum message size");
196 static int maxmq = 100;
197 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
198 &maxmq, 0, "maximum message queues");
199 static int curmq = 0;
200 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
201 &curmq, 0, "current message queue number");
202 static int unloadable = 0;
203 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
205 static eventhandler_tag exit_tag;
207 /* Only one instance per-system */
208 static struct mqfs_info mqfs_data;
209 static uma_zone_t mqnode_zone;
210 static uma_zone_t mqueue_zone;
211 static uma_zone_t mvdata_zone;
212 static uma_zone_t mqnoti_zone;
213 static struct vop_vector mqfs_vnodeops;
214 static struct fileops mqueueops;
217 * Directory structure construction and manipulation
220 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
221 const char *name, int namelen, struct ucred *cred, int mode);
222 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
223 const char *name, int namelen, struct ucred *cred, int mode);
226 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
227 const char *name, int namelen, struct ucred *cred, int mode);
228 static int mqfs_destroy(struct mqfs_node *mn);
229 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
230 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
231 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
234 * Message queue construction and maniplation
236 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
237 static void mqueue_free(struct mqueue *mq);
238 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
239 size_t msg_len, unsigned msg_prio, int waitok,
240 const struct timespec *abs_timeout);
241 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
242 size_t msg_len, unsigned *msg_prio, int waitok,
243 const struct timespec *abs_timeout);
244 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
246 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
248 static void mqueue_send_notification(struct mqueue *mq);
249 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
250 static void mq_proc_exit(void *arg, struct proc *p);
255 static void filt_mqdetach(struct knote *kn);
256 static int filt_mqread(struct knote *kn, long hint);
257 static int filt_mqwrite(struct knote *kn, long hint);
259 struct filterops mq_rfiltops =
260 { 1, NULL, filt_mqdetach, filt_mqread };
261 struct filterops mq_wfiltops =
262 { 1, NULL, filt_mqdetach, filt_mqwrite };
265 * Initialize fileno bitmap
268 mqfs_fileno_init(struct mqfs_info *mi)
272 up = new_unrhdr(1, INT_MAX, NULL);
277 * Tear down fileno bitmap
280 mqfs_fileno_uninit(struct mqfs_info *mi)
285 mi->mi_unrhdr = NULL;
290 * Allocate a file number
293 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
295 /* make sure our parent has a file number */
296 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
297 mqfs_fileno_alloc(mi, mn->mn_parent);
299 switch (mn->mn_type) {
303 case mqfstype_symlink:
304 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
307 KASSERT(mn->mn_parent != NULL,
308 ("mqfstype_this node has no parent"));
309 mn->mn_fileno = mn->mn_parent->mn_fileno;
311 case mqfstype_parent:
312 KASSERT(mn->mn_parent != NULL,
313 ("mqfstype_parent node has no parent"));
314 if (mn->mn_parent == mi->mi_root) {
315 mn->mn_fileno = mn->mn_parent->mn_fileno;
318 KASSERT(mn->mn_parent->mn_parent != NULL,
319 ("mqfstype_parent node has no grandparent"));
320 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
324 ("mqfs_fileno_alloc() called for unknown type node: %d",
331 * Release a file number
334 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
336 switch (mn->mn_type) {
340 case mqfstype_symlink:
341 free_unr(mi->mi_unrhdr, mn->mn_fileno);
344 case mqfstype_parent:
345 /* ignore these, as they don't "own" their file number */
349 ("mqfs_fileno_free() called for unknown type node: %d",
355 static __inline struct mqfs_node *
358 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
362 mqnode_free(struct mqfs_node *node)
364 uma_zfree(mqnode_zone, node);
368 mqnode_addref(struct mqfs_node *node)
370 atomic_fetchadd_int(&node->mn_refcount, 1);
374 mqnode_release(struct mqfs_node *node)
376 struct mqfs_info *mqfs;
379 mqfs = node->mn_info;
380 old = atomic_fetchadd_int(&node->mn_refcount, -1);
381 if (node->mn_type == mqfstype_dir ||
382 node->mn_type == mqfstype_root)
383 exp = 3; /* include . and .. */
387 int locked = sx_xlocked(&mqfs->mi_lock);
389 sx_xlock(&mqfs->mi_lock);
392 sx_xunlock(&mqfs->mi_lock);
397 * Add a node to a directory
400 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
402 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
403 KASSERT(parent->mn_info != NULL,
404 ("%s(): parent has no mn_info", __func__));
405 KASSERT(parent->mn_type == mqfstype_dir ||
406 parent->mn_type == mqfstype_root,
407 ("%s(): parent is not a directory", __func__));
409 node->mn_info = parent->mn_info;
410 node->mn_parent = parent;
411 LIST_INIT(&node->mn_children);
412 LIST_INIT(&node->mn_vnodes);
413 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
414 mqnode_addref(parent);
418 static struct mqfs_node *
419 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
422 struct mqfs_node *node;
424 node = mqnode_alloc();
425 strncpy(node->mn_name, name, namelen);
426 node->mn_type = nodetype;
427 node->mn_refcount = 1;
428 vfs_timestamp(&node->mn_birth);
429 node->mn_ctime = node->mn_atime = node->mn_mtime
431 node->mn_uid = cred->cr_uid;
432 node->mn_gid = cred->cr_gid;
433 node->mn_mode = mode;
440 static struct mqfs_node *
441 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
442 struct ucred *cred, int mode)
444 struct mqfs_node *node;
446 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
447 if (mqfs_add_node(parent, node) != 0) {
455 * Add . and .. to a directory
458 mqfs_fixup_dir(struct mqfs_node *parent)
460 struct mqfs_node *dir;
462 dir = mqnode_alloc();
463 dir->mn_name[0] = '.';
464 dir->mn_type = mqfstype_this;
465 dir->mn_refcount = 1;
466 if (mqfs_add_node(parent, dir) != 0) {
471 dir = mqnode_alloc();
472 dir->mn_name[0] = dir->mn_name[1] = '.';
473 dir->mn_type = mqfstype_parent;
474 dir->mn_refcount = 1;
476 if (mqfs_add_node(parent, dir) != 0) {
489 static struct mqfs_node *
490 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
491 struct ucred *cred, int mode)
493 struct mqfs_node *node;
495 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
496 if (mqfs_add_node(parent, node) != 0) {
501 if (mqfs_fixup_dir(node) != 0) {
511 static struct mqfs_node *
512 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
513 struct ucred *cred, int mode)
515 struct mqfs_node *node;
517 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
518 if (mqfs_add_node(parent, node) != 0) {
528 * Destroy a node or a tree of nodes
531 mqfs_destroy(struct mqfs_node *node)
533 struct mqfs_node *parent;
535 KASSERT(node != NULL,
536 ("%s(): node is NULL", __func__));
537 KASSERT(node->mn_info != NULL,
538 ("%s(): node has no mn_info", __func__));
540 /* destroy children */
541 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
542 while (! LIST_EMPTY(&node->mn_children))
543 mqfs_destroy(LIST_FIRST(&node->mn_children));
545 /* unlink from parent */
546 if ((parent = node->mn_parent) != NULL) {
547 KASSERT(parent->mn_info == node->mn_info,
548 ("%s(): parent has different mn_info", __func__));
549 LIST_REMOVE(node, mn_sibling);
552 if (node->mn_fileno != 0)
553 mqfs_fileno_free(node->mn_info, node);
554 if (node->mn_data != NULL)
555 mqueue_free(node->mn_data);
561 * Mount a mqfs instance
564 mqfs_mount(struct mount *mp)
568 if (mp->mnt_flag & MNT_UPDATE)
571 mp->mnt_data = &mqfs_data;
573 mp->mnt_flag |= MNT_LOCAL;
574 mp->mnt_kern_flag |= MNTK_MPSAFE;
579 vfs_mountedfrom(mp, "mqueue");
580 sbp->f_bsize = PAGE_SIZE;
581 sbp->f_iosize = PAGE_SIZE;
591 * Unmount a mqfs instance
594 mqfs_unmount(struct mount *mp, int mntflags)
598 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
604 * Return a root vnode
607 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
609 struct mqfs_info *mqfs;
612 mqfs = VFSTOMQFS(mp);
613 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
618 * Return filesystem stats
621 mqfs_statfs(struct mount *mp, struct statfs *sbp)
623 /* XXX update statistics */
628 * Initialize a mqfs instance
631 mqfs_init(struct vfsconf *vfc)
633 struct mqfs_node *root;
634 struct mqfs_info *mi;
636 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
637 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
638 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
639 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
640 mvdata_zone = uma_zcreate("mvdata",
641 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
642 NULL, UMA_ALIGN_PTR, 0);
643 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
644 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
646 sx_init(&mi->mi_lock, "mqfs lock");
647 /* set up the root diretory */
648 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
651 LIST_INIT(&root->mn_children);
652 LIST_INIT(&root->mn_vnodes);
654 mqfs_fileno_init(mi);
655 mqfs_fileno_alloc(mi, root);
656 mqfs_fixup_dir(root);
657 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
658 EVENTHANDLER_PRI_ANY);
659 mq_fdclose = mqueue_fdclose;
660 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
665 * Destroy a mqfs instance
668 mqfs_uninit(struct vfsconf *vfc)
670 struct mqfs_info *mi;
674 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
676 mqfs_destroy(mi->mi_root);
678 mqfs_fileno_uninit(mi);
679 sx_destroy(&mi->mi_lock);
680 uma_zdestroy(mqnode_zone);
681 uma_zdestroy(mqueue_zone);
682 uma_zdestroy(mvdata_zone);
683 uma_zdestroy(mqnoti_zone);
691 do_recycle(void *context, int pending __unused)
693 struct vnode *vp = (struct vnode *)context;
695 vrecycle(vp, curthread);
703 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
705 struct mqfs_vdata *vd;
706 struct mqfs_info *mqfs;
707 struct vnode *newvpp;
712 sx_xlock(&mqfs->mi_lock);
713 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
714 if (vd->mv_vnode->v_mount == mp) {
723 sx_xunlock(&mqfs->mi_lock);
724 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
728 sx_xunlock(&mqfs->mi_lock);
730 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
733 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
734 error = insmntque(newvpp, mp);
738 sx_xlock(&mqfs->mi_lock);
740 * Check if it has already been allocated
741 * while we were blocked.
743 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
744 if (vd->mv_vnode->v_mount == mp) {
746 sx_xunlock(&mqfs->mi_lock);
756 vd = uma_zalloc(mvdata_zone, M_WAITOK);
760 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
761 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
763 switch (pn->mn_type) {
765 (*vpp)->v_vflag = VV_ROOT;
769 case mqfstype_parent:
770 (*vpp)->v_type = VDIR;
773 (*vpp)->v_type = VREG;
775 case mqfstype_symlink:
776 (*vpp)->v_type = VLNK;
779 KASSERT(0, ("mqfs_allocf called for null node\n"));
781 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
783 sx_xunlock(&mqfs->mi_lock);
788 * Search a directory entry
790 static struct mqfs_node *
791 mqfs_search(struct mqfs_node *pd, const char *name, int len)
793 struct mqfs_node *pn;
795 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
796 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
797 if (strncmp(pn->mn_name, name, len) == 0 &&
798 pn->mn_name[len] == '\0')
805 * Look up a file or directory.
808 mqfs_lookupx(struct vop_cachedlookup_args *ap)
810 struct componentname *cnp;
811 struct vnode *dvp, **vpp;
812 struct mqfs_node *pd;
813 struct mqfs_node *pn;
814 struct mqfs_info *mqfs;
815 int nameiop, flags, error, namelen;
822 pname = cnp->cn_nameptr;
823 namelen = cnp->cn_namelen;
825 flags = cnp->cn_flags;
826 nameiop = cnp->cn_nameiop;
832 if (dvp->v_type != VDIR)
835 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
839 /* shortcut: check if the name is too long */
840 if (cnp->cn_namelen >= MQFS_NAMELEN)
844 if (namelen == 1 && pname[0] == '.') {
845 if ((flags & ISLASTCN) && nameiop != LOOKUP)
854 if (cnp->cn_flags & ISDOTDOT) {
855 if (dvp->v_vflag & VV_ROOT)
857 if ((flags & ISLASTCN) && nameiop != LOOKUP)
860 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
862 error = mqfs_allocv(dvp->v_mount, vpp, pn);
863 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
868 sx_xlock(&mqfs->mi_lock);
869 pn = mqfs_search(pd, pname, namelen);
872 sx_xunlock(&mqfs->mi_lock);
877 if (nameiop == DELETE && (flags & ISLASTCN)) {
878 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
892 error = mqfs_allocv(dvp->v_mount, vpp, pn);
894 if (error == 0 && cnp->cn_flags & MAKEENTRY)
895 cache_enter(dvp, *vpp, cnp);
901 /* will create a new entry in the directory ? */
902 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
903 && (flags & ISLASTCN)) {
904 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
907 cnp->cn_flags |= SAVENAME;
908 return (EJUSTRETURN);
914 struct vop_lookup_args {
915 struct vop_generic_args a_gen;
917 struct vnode **a_vpp;
918 struct componentname *a_cnp;
923 * vnode lookup operation
926 mqfs_lookup(struct vop_cachedlookup_args *ap)
930 rc = mqfs_lookupx(ap);
935 struct vop_create_args {
937 struct vnode **a_vpp;
938 struct componentname *a_cnp;
944 * vnode creation operation
947 mqfs_create(struct vop_create_args *ap)
949 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
950 struct componentname *cnp = ap->a_cnp;
951 struct mqfs_node *pd;
952 struct mqfs_node *pn;
956 pd = VTON(ap->a_dvp);
957 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
959 mq = mqueue_alloc(NULL);
962 sx_xlock(&mqfs->mi_lock);
963 if ((cnp->cn_flags & HASBUF) == 0)
964 panic("%s: no name", __func__);
965 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
966 cnp->cn_cred, ap->a_vap->va_mode);
968 sx_xunlock(&mqfs->mi_lock);
972 sx_xunlock(&mqfs->mi_lock);
973 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
989 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
991 struct mqfs_node *parent;
992 struct mqfs_vdata *vd;
995 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
997 if (ucred->cr_uid != pn->mn_uid &&
998 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1000 else if (!pn->mn_deleted) {
1001 parent = pn->mn_parent;
1002 pn->mn_parent = NULL;
1004 LIST_REMOVE(pn, mn_sibling);
1005 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1006 cache_purge(vd->mv_vnode);
1007 vhold(vd->mv_vnode);
1008 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1011 mqnode_release(parent);
1018 struct vop_remove_args {
1019 struct vnode *a_dvp;
1021 struct componentname *a_cnp;
1026 * vnode removal operation
1029 mqfs_remove(struct vop_remove_args *ap)
1031 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1032 struct mqfs_node *pn;
1035 if (ap->a_vp->v_type == VDIR)
1037 pn = VTON(ap->a_vp);
1038 sx_xlock(&mqfs->mi_lock);
1039 error = do_unlink(pn, ap->a_cnp->cn_cred);
1040 sx_xunlock(&mqfs->mi_lock);
1045 struct vop_inactive_args {
1047 struct thread *a_td;
1052 mqfs_inactive(struct vop_inactive_args *ap)
1054 struct mqfs_node *pn = VTON(ap->a_vp);
1057 vrecycle(ap->a_vp, ap->a_td);
1062 struct vop_reclaim_args {
1063 struct vop_generic_args a_gen;
1065 struct thread *a_td;
1070 mqfs_reclaim(struct vop_reclaim_args *ap)
1072 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1073 struct vnode *vp = ap->a_vp;
1074 struct mqfs_node *pn;
1075 struct mqfs_vdata *vd;
1079 sx_xlock(&mqfs->mi_lock);
1081 LIST_REMOVE(vd, mv_link);
1082 uma_zfree(mvdata_zone, vd);
1084 sx_xunlock(&mqfs->mi_lock);
1089 struct vop_open_args {
1090 struct vop_generic_args a_gen;
1093 struct ucred *a_cred;
1094 struct thread *a_td;
1100 mqfs_open(struct vop_open_args *ap)
1106 struct vop_close_args {
1107 struct vop_generic_args a_gen;
1110 struct ucred *a_cred;
1111 struct thread *a_td;
1116 mqfs_close(struct vop_close_args *ap)
1122 struct vop_access_args {
1123 struct vop_generic_args a_gen;
1125 accmode_t a_accmode;
1126 struct ucred *a_cred;
1127 struct thread *a_td;
1132 * Verify permissions
1135 mqfs_access(struct vop_access_args *ap)
1137 struct vnode *vp = ap->a_vp;
1141 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1144 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1145 vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1150 struct vop_getattr_args {
1151 struct vop_generic_args a_gen;
1153 struct vattr *a_vap;
1154 struct ucred *a_cred;
1159 * Get file attributes
1162 mqfs_getattr(struct vop_getattr_args *ap)
1164 struct vnode *vp = ap->a_vp;
1165 struct mqfs_node *pn = VTON(vp);
1166 struct vattr *vap = ap->a_vap;
1169 vap->va_type = vp->v_type;
1170 vap->va_mode = pn->mn_mode;
1172 vap->va_uid = pn->mn_uid;
1173 vap->va_gid = pn->mn_gid;
1174 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1175 vap->va_fileid = pn->mn_fileno;
1177 vap->va_blocksize = PAGE_SIZE;
1178 vap->va_bytes = vap->va_size = 0;
1179 vap->va_atime = pn->mn_atime;
1180 vap->va_mtime = pn->mn_mtime;
1181 vap->va_ctime = pn->mn_ctime;
1182 vap->va_birthtime = pn->mn_birth;
1185 vap->va_rdev = NODEV;
1187 vap->va_filerev = 0;
1192 struct vop_setattr_args {
1193 struct vop_generic_args a_gen;
1195 struct vattr *a_vap;
1196 struct ucred *a_cred;
1203 mqfs_setattr(struct vop_setattr_args *ap)
1205 struct mqfs_node *pn;
1216 if ((vap->va_type != VNON) ||
1217 (vap->va_nlink != VNOVAL) ||
1218 (vap->va_fsid != VNOVAL) ||
1219 (vap->va_fileid != VNOVAL) ||
1220 (vap->va_blocksize != VNOVAL) ||
1221 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1222 (vap->va_rdev != VNOVAL) ||
1223 ((int)vap->va_bytes != VNOVAL) ||
1224 (vap->va_gen != VNOVAL)) {
1231 if (vap->va_uid == (uid_t)VNOVAL)
1235 if (vap->va_gid == (gid_t)VNOVAL)
1240 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1242 * To modify the ownership of a file, must possess VADMIN
1245 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1249 * XXXRW: Why is there a privilege check here: shouldn't the
1250 * check in VOP_ACCESS() be enough? Also, are the group bits
1251 * below definitely right?
1253 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1254 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1255 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1262 if (vap->va_mode != (mode_t)VNOVAL) {
1263 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1264 (error = priv_check(td, PRIV_MQ_ADMIN)))
1266 pn->mn_mode = vap->va_mode;
1270 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1271 /* See the comment in ufs_vnops::ufs_setattr(). */
1272 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1273 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1274 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1276 if (vap->va_atime.tv_sec != VNOVAL) {
1277 pn->mn_atime = vap->va_atime;
1279 if (vap->va_mtime.tv_sec != VNOVAL) {
1280 pn->mn_mtime = vap->va_mtime;
1285 vfs_timestamp(&pn->mn_ctime);
1291 struct vop_read_args {
1292 struct vop_generic_args a_gen;
1296 struct ucred *a_cred;
1304 mqfs_read(struct vop_read_args *ap)
1307 struct vnode *vp = ap->a_vp;
1308 struct uio *uio = ap->a_uio;
1309 struct mqfs_node *pn;
1313 if (vp->v_type != VREG)
1318 snprintf(buf, sizeof(buf),
1319 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1324 buf[sizeof(buf)-1] = '\0';
1326 error = uiomove_frombuf(buf, len, uio);
1331 struct vop_readdir_args {
1332 struct vop_generic_args a_gen;
1335 struct ucred *a_cred;
1343 * Return directory entries.
1346 mqfs_readdir(struct vop_readdir_args *ap)
1349 struct mqfs_info *mi;
1350 struct mqfs_node *pd;
1351 struct mqfs_node *pn;
1352 struct dirent entry;
1354 int *tmp_ncookies = NULL;
1359 mi = VFSTOMQFS(vp->v_mount);
1363 if (vp->v_type != VDIR)
1366 if (uio->uio_offset < 0)
1369 if (ap->a_ncookies != NULL) {
1370 tmp_ncookies = ap->a_ncookies;
1371 *ap->a_ncookies = 0;
1372 ap->a_ncookies = NULL;
1378 sx_xlock(&mi->mi_lock);
1380 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1381 entry.d_reclen = sizeof(entry);
1383 mqfs_fileno_alloc(mi, pn);
1384 entry.d_fileno = pn->mn_fileno;
1385 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1386 entry.d_name[i] = pn->mn_name[i];
1387 entry.d_name[i] = 0;
1389 switch (pn->mn_type) {
1393 case mqfstype_parent:
1394 entry.d_type = DT_DIR;
1397 entry.d_type = DT_REG;
1399 case mqfstype_symlink:
1400 entry.d_type = DT_LNK;
1403 panic("%s has unexpected node type: %d", pn->mn_name,
1406 if (entry.d_reclen > uio->uio_resid)
1408 if (offset >= uio->uio_offset) {
1409 error = vfs_read_dirent(ap, &entry, offset);
1413 offset += entry.d_reclen;
1415 sx_xunlock(&mi->mi_lock);
1417 uio->uio_offset = offset;
1419 if (tmp_ncookies != NULL)
1420 ap->a_ncookies = tmp_ncookies;
1428 struct vop_mkdir_args {
1429 struct vnode *a_dvp;
1430 struvt vnode **a_vpp;
1431 struvt componentname *a_cnp;
1432 struct vattr *a_vap;
1437 * Create a directory.
1440 mqfs_mkdir(struct vop_mkdir_args *ap)
1442 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1443 struct componentname *cnp = ap->a_cnp;
1444 struct mqfs_node *pd = VTON(ap->a_dvp);
1445 struct mqfs_node *pn;
1448 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1450 sx_xlock(&mqfs->mi_lock);
1451 if ((cnp->cn_flags & HASBUF) == 0)
1452 panic("%s: no name", __func__);
1453 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1454 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1457 sx_xunlock(&mqfs->mi_lock);
1461 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1468 struct vop_rmdir_args {
1469 struct vnode *a_dvp;
1471 struct componentname *a_cnp;
1476 * Remove a directory.
1479 mqfs_rmdir(struct vop_rmdir_args *ap)
1481 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1482 struct mqfs_node *pn = VTON(ap->a_vp);
1483 struct mqfs_node *pt;
1485 if (pn->mn_type != mqfstype_dir)
1488 sx_xlock(&mqfs->mi_lock);
1489 if (pn->mn_deleted) {
1490 sx_xunlock(&mqfs->mi_lock);
1494 pt = LIST_FIRST(&pn->mn_children);
1495 pt = LIST_NEXT(pt, mn_sibling);
1496 pt = LIST_NEXT(pt, mn_sibling);
1498 sx_xunlock(&mqfs->mi_lock);
1502 pn->mn_parent = NULL;
1504 LIST_REMOVE(pn, mn_sibling);
1507 sx_xunlock(&mqfs->mi_lock);
1508 cache_purge(ap->a_vp);
1515 * Allocate a message queue
1517 static struct mqueue *
1518 mqueue_alloc(const struct mq_attr *attr)
1524 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1525 TAILQ_INIT(&mq->mq_msgq);
1527 mq->mq_maxmsg = attr->mq_maxmsg;
1528 mq->mq_msgsize = attr->mq_msgsize;
1530 mq->mq_maxmsg = default_maxmsg;
1531 mq->mq_msgsize = default_msgsize;
1533 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1534 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1535 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1536 atomic_add_int(&curmq, 1);
1541 * Destroy a message queue
1544 mqueue_free(struct mqueue *mq)
1546 struct mqueue_msg *msg;
1548 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1549 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1550 free(msg, M_MQUEUEDATA);
1553 mtx_destroy(&mq->mq_mutex);
1554 knlist_destroy(&mq->mq_rsel.si_note);
1555 knlist_destroy(&mq->mq_wsel.si_note);
1556 uma_zfree(mqueue_zone, mq);
1557 atomic_add_int(&curmq, -1);
1561 * Load a message from user space
1563 static struct mqueue_msg *
1564 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1566 struct mqueue_msg *msg;
1570 len = sizeof(struct mqueue_msg) + msg_size;
1571 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1572 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1575 free(msg, M_MQUEUEDATA);
1578 msg->msg_size = msg_size;
1579 msg->msg_prio = msg_prio;
1585 * Save a message to user space
1588 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1592 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1594 if (error == 0 && msg_prio != NULL)
1595 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1600 * Free a message's memory
1602 static __inline void
1603 mqueue_freemsg(struct mqueue_msg *msg)
1605 free(msg, M_MQUEUEDATA);
1609 * Send a message. if waitok is false, thread will not be
1610 * blocked if there is no data in queue, otherwise, absolute
1611 * time will be checked.
1614 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1615 size_t msg_len, unsigned msg_prio, int waitok,
1616 const struct timespec *abs_timeout)
1618 struct mqueue_msg *msg;
1619 struct timespec ets, ts, ts2;
1623 if (msg_prio >= MQ_PRIO_MAX)
1625 if (msg_len > mq->mq_msgsize)
1627 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1631 /* O_NONBLOCK case */
1633 error = _mqueue_send(mq, msg, -1);
1639 /* we allow a null timeout (wait forever) */
1640 if (abs_timeout == NULL) {
1641 error = _mqueue_send(mq, msg, 0);
1647 /* send it before checking time */
1648 error = _mqueue_send(mq, msg, -1);
1652 if (error != EAGAIN)
1655 error = copyin(abs_timeout, &ets, sizeof(ets));
1658 if (ets.tv_nsec >= 1000000000 || ets.tv_nsec < 0) {
1665 timespecsub(&ts2, &ts);
1666 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1670 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1671 error = _mqueue_send(mq, msg, tvtohz(&tv));
1672 if (error != ETIMEDOUT)
1678 mqueue_freemsg(msg);
1683 * Common routine to send a message
1686 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1688 struct mqueue_msg *msg2;
1691 mtx_lock(&mq->mq_mutex);
1692 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1694 mtx_unlock(&mq->mq_mutex);
1698 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1699 PCATCH, "mqsend", timo);
1701 if (error == EAGAIN)
1704 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1705 mtx_unlock(&mq->mq_mutex);
1709 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1710 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1712 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1713 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1715 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1716 if (msg2->msg_prio < msg->msg_prio)
1719 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1723 mq->mq_totalbytes += msg->msg_size;
1724 if (mq->mq_receivers)
1725 wakeup_one(&mq->mq_receivers);
1726 else if (mq->mq_notifier != NULL)
1727 mqueue_send_notification(mq);
1728 if (mq->mq_flags & MQ_RSEL) {
1729 mq->mq_flags &= ~MQ_RSEL;
1730 selwakeup(&mq->mq_rsel);
1732 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1733 mtx_unlock(&mq->mq_mutex);
1738 * Send realtime a signal to process which registered itself
1739 * successfully by mq_notify.
1742 mqueue_send_notification(struct mqueue *mq)
1744 struct mqueue_notifier *nt;
1747 mtx_assert(&mq->mq_mutex, MA_OWNED);
1748 nt = mq->mq_notifier;
1749 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1752 if (!KSI_ONQ(&nt->nt_ksi))
1753 psignal_event(p, &nt->nt_sigev, &nt->nt_ksi);
1756 mq->mq_notifier = NULL;
1760 * Get a message. if waitok is false, thread will not be
1761 * blocked if there is no data in queue, otherwise, absolute
1762 * time will be checked.
1765 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1766 size_t msg_len, unsigned *msg_prio, int waitok,
1767 const struct timespec *abs_timeout)
1769 struct mqueue_msg *msg;
1770 struct timespec ets, ts, ts2;
1774 if (msg_len < mq->mq_msgsize)
1777 /* O_NONBLOCK case */
1779 error = _mqueue_recv(mq, &msg, -1);
1785 /* we allow a null timeout (wait forever). */
1786 if (abs_timeout == NULL) {
1787 error = _mqueue_recv(mq, &msg, 0);
1793 /* try to get a message before checking time */
1794 error = _mqueue_recv(mq, &msg, -1);
1798 if (error != EAGAIN)
1801 error = copyin(abs_timeout, &ets, sizeof(ets));
1804 if (ets.tv_nsec >= 1000000000 || ets.tv_nsec < 0) {
1812 timespecsub(&ts2, &ts);
1813 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1817 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1818 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1821 if (error != ETIMEDOUT)
1826 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1828 curthread->td_retval[0] = msg->msg_size;
1829 curthread->td_retval[1] = 0;
1831 mqueue_freemsg(msg);
1836 * Common routine to receive a message
1839 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1843 mtx_lock(&mq->mq_mutex);
1844 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1846 mtx_unlock(&mq->mq_mutex);
1850 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1851 PCATCH, "mqrecv", timo);
1853 if (error == EAGAIN)
1858 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1860 mq->mq_totalbytes -= (*msg)->msg_size;
1862 wakeup_one(&mq->mq_senders);
1863 if (mq->mq_flags & MQ_WSEL) {
1864 mq->mq_flags &= ~MQ_WSEL;
1865 selwakeup(&mq->mq_wsel);
1867 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1869 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1870 !TAILQ_EMPTY(&mq->mq_msgq)) {
1871 mqueue_send_notification(mq);
1873 mtx_unlock(&mq->mq_mutex);
1877 static __inline struct mqueue_notifier *
1878 notifier_alloc(void)
1880 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1883 static __inline void
1884 notifier_free(struct mqueue_notifier *p)
1886 uma_zfree(mqnoti_zone, p);
1889 static struct mqueue_notifier *
1890 notifier_search(struct proc *p, int fd)
1892 struct mqueue_notifier *nt;
1894 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1895 if (nt->nt_ksi.ksi_mqd == fd)
1901 static __inline void
1902 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1904 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1907 static __inline void
1908 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1910 LIST_REMOVE(nt, nt_link);
1915 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1917 struct mqueue_notifier *nt;
1919 mtx_assert(&mq->mq_mutex, MA_OWNED);
1921 nt = notifier_search(p, fd);
1923 if (mq->mq_notifier == nt)
1924 mq->mq_notifier = NULL;
1925 sigqueue_take(&nt->nt_ksi);
1926 notifier_delete(p, nt);
1932 * Syscall to open a message queue.
1935 kmq_open(struct thread *td, struct kmq_open_args *uap)
1937 char path[MQFS_NAMELEN + 1];
1938 struct mq_attr attr, *pattr;
1939 struct mqfs_node *pn;
1940 struct filedesc *fdp;
1943 int fd, error, len, flags, cmode;
1945 if ((uap->flags & O_ACCMODE) == O_ACCMODE)
1948 fdp = td->td_proc->p_fd;
1949 flags = FFLAGS(uap->flags);
1950 cmode = (((uap->mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
1952 if ((flags & O_CREAT) && (uap->attr != NULL)) {
1953 error = copyin(uap->attr, &attr, sizeof(attr));
1956 if (attr.mq_maxmsg <= 0 || attr.mq_maxmsg > maxmsg)
1958 if (attr.mq_msgsize <= 0 || attr.mq_msgsize > maxmsgsize)
1964 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
1969 * The first character of name must be a slash (/) character
1970 * and the remaining characters of name cannot include any slash
1974 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
1977 error = falloc(td, &fp, &fd);
1981 sx_xlock(&mqfs_data.mi_lock);
1982 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
1984 if (!(flags & O_CREAT)) {
1987 mq = mqueue_alloc(pattr);
1991 pn = mqfs_create_file(mqfs_data.mi_root,
1992 path + 1, len - 1, td->td_ucred,
2005 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2008 accmode_t accmode = 0;
2014 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2015 pn->mn_gid, accmode, td->td_ucred, NULL);
2020 sx_xunlock(&mqfs_data.mi_lock);
2021 fdclose(fdp, fp, fd, td);
2027 sx_xunlock(&mqfs_data.mi_lock);
2029 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2032 FILEDESC_XLOCK(fdp);
2033 if (fdp->fd_ofiles[fd] == fp)
2034 fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
2035 FILEDESC_XUNLOCK(fdp);
2036 td->td_retval[0] = fd;
2042 * Syscall to unlink a message queue.
2045 kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2047 char path[MQFS_NAMELEN+1];
2048 struct mqfs_node *pn;
2051 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2056 if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
2059 sx_xlock(&mqfs_data.mi_lock);
2060 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
2062 error = do_unlink(pn, td->td_ucred);
2065 sx_xunlock(&mqfs_data.mi_lock);
2069 typedef int (*_fgetf)(struct thread *, int, struct file **);
2072 * Get message queue by giving file slot
2075 _getmq(struct thread *td, int fd, _fgetf func,
2076 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2078 struct mqfs_node *pn;
2081 error = func(td, fd, fpp);
2084 if (&mqueueops != (*fpp)->f_ops) {
2088 pn = (*fpp)->f_data;
2097 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2098 struct mqueue **pmq)
2100 return _getmq(td, fd, fget, fpp, ppn, pmq);
2104 getmq_read(struct thread *td, int fd, struct file **fpp,
2105 struct mqfs_node **ppn, struct mqueue **pmq)
2107 return _getmq(td, fd, fget_read, fpp, ppn, pmq);
2111 getmq_write(struct thread *td, int fd, struct file **fpp,
2112 struct mqfs_node **ppn, struct mqueue **pmq)
2114 return _getmq(td, fd, fget_write, fpp, ppn, pmq);
2118 kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2122 struct mq_attr attr, oattr;
2127 error = copyin(uap->attr, &attr, sizeof(attr));
2130 if (attr.mq_flags & ~O_NONBLOCK)
2133 error = getmq(td, uap->mqd, &fp, NULL, &mq);
2136 oattr.mq_maxmsg = mq->mq_maxmsg;
2137 oattr.mq_msgsize = mq->mq_msgsize;
2138 oattr.mq_curmsgs = mq->mq_curmsgs;
2141 oflag = flag = fp->f_flag;
2142 flag &= ~O_NONBLOCK;
2143 flag |= (attr.mq_flags & O_NONBLOCK);
2144 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2147 oattr.mq_flags = (O_NONBLOCK & oflag);
2150 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2155 kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2162 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2165 waitok = !(fp->f_flag & O_NONBLOCK);
2166 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2167 uap->msg_prio, waitok, uap->abs_timeout);
2173 kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2179 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2182 waitok = !(fp->f_flag & O_NONBLOCK);
2183 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2184 uap->msg_prio, waitok, uap->abs_timeout);
2190 kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2193 struct filedesc *fdp;
2197 struct mqueue_notifier *nt, *newnt = NULL;
2201 fdp = td->td_proc->p_fd;
2203 error = copyin(uap->sigev, &ev, sizeof(ev));
2206 if (ev.sigev_notify != SIGEV_SIGNAL &&
2207 ev.sigev_notify != SIGEV_THREAD_ID &&
2208 ev.sigev_notify != SIGEV_NONE)
2210 if ((ev.sigev_notify == SIGEV_SIGNAL ||
2211 ev.sigev_notify == SIGEV_THREAD_ID) &&
2212 !_SIG_VALID(ev.sigev_signo))
2215 error = getmq(td, uap->mqd, &fp, NULL, &mq);
2219 FILEDESC_SLOCK(fdp);
2220 if (fget_locked(fdp, uap->mqd) != fp) {
2221 FILEDESC_SUNLOCK(fdp);
2225 mtx_lock(&mq->mq_mutex);
2226 FILEDESC_SUNLOCK(fdp);
2227 if (uap->sigev != NULL) {
2228 if (mq->mq_notifier != NULL) {
2232 nt = notifier_search(p, uap->mqd);
2234 if (newnt == NULL) {
2236 mtx_unlock(&mq->mq_mutex);
2237 newnt = notifier_alloc();
2243 sigqueue_take(&nt->nt_ksi);
2244 if (newnt != NULL) {
2245 notifier_free(newnt);
2251 ksiginfo_init(&nt->nt_ksi);
2252 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2253 nt->nt_ksi.ksi_code = SI_MESGQ;
2255 nt->nt_ksi.ksi_mqd = uap->mqd;
2256 notifier_insert(p, nt);
2259 mq->mq_notifier = nt;
2262 * if there is no receivers and message queue
2263 * is not empty, we should send notification
2264 * as soon as possible.
2266 if (mq->mq_receivers == 0 &&
2267 !TAILQ_EMPTY(&mq->mq_msgq))
2268 mqueue_send_notification(mq);
2271 notifier_remove(p, mq, uap->mqd);
2273 mtx_unlock(&mq->mq_mutex);
2278 notifier_free(newnt);
2283 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2285 struct filedesc *fdp;
2288 fdp = td->td_proc->p_fd;
2289 FILEDESC_LOCK_ASSERT(fdp);
2291 if (fp->f_ops == &mqueueops) {
2293 mtx_lock(&mq->mq_mutex);
2294 notifier_remove(td->td_proc, mq, fd);
2296 /* have to wakeup thread in same process */
2297 if (mq->mq_flags & MQ_RSEL) {
2298 mq->mq_flags &= ~MQ_RSEL;
2299 selwakeup(&mq->mq_rsel);
2301 if (mq->mq_flags & MQ_WSEL) {
2302 mq->mq_flags &= ~MQ_WSEL;
2303 selwakeup(&mq->mq_wsel);
2305 mtx_unlock(&mq->mq_mutex);
2310 mq_proc_exit(void *arg __unused, struct proc *p)
2312 struct filedesc *fdp;
2318 FILEDESC_SLOCK(fdp);
2319 for (i = 0; i < fdp->fd_nfiles; ++i) {
2320 fp = fget_locked(fdp, i);
2321 if (fp != NULL && fp->f_ops == &mqueueops) {
2323 mtx_lock(&mq->mq_mutex);
2324 notifier_remove(p, FPTOMQ(fp), i);
2325 mtx_unlock(&mq->mq_mutex);
2328 FILEDESC_SUNLOCK(fdp);
2329 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2333 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
2334 int flags, struct thread *td)
2336 return (EOPNOTSUPP);
2340 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
2341 int flags, struct thread *td)
2343 return (EOPNOTSUPP);
2347 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred,
2355 mqf_ioctl(struct file *fp, u_long cmd, void *data,
2356 struct ucred *active_cred, struct thread *td)
2362 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2365 struct mqueue *mq = FPTOMQ(fp);
2368 mtx_lock(&mq->mq_mutex);
2369 if (events & (POLLIN | POLLRDNORM)) {
2370 if (mq->mq_curmsgs) {
2371 revents |= events & (POLLIN | POLLRDNORM);
2373 mq->mq_flags |= MQ_RSEL;
2374 selrecord(td, &mq->mq_rsel);
2377 if (events & POLLOUT) {
2378 if (mq->mq_curmsgs < mq->mq_maxmsg)
2381 mq->mq_flags |= MQ_WSEL;
2382 selrecord(td, &mq->mq_wsel);
2385 mtx_unlock(&mq->mq_mutex);
2390 mqf_close(struct file *fp, struct thread *td)
2392 struct mqfs_node *pn;
2394 fp->f_ops = &badfileops;
2397 sx_xlock(&mqfs_data.mi_lock);
2399 sx_xunlock(&mqfs_data.mi_lock);
2404 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2407 struct mqfs_node *pn = fp->f_data;
2409 bzero(st, sizeof *st);
2410 st->st_atimespec = pn->mn_atime;
2411 st->st_mtimespec = pn->mn_mtime;
2412 st->st_ctimespec = pn->mn_ctime;
2413 st->st_birthtimespec = pn->mn_birth;
2414 st->st_uid = pn->mn_uid;
2415 st->st_gid = pn->mn_gid;
2416 st->st_mode = S_IFIFO | pn->mn_mode;
2421 mqf_kqfilter(struct file *fp, struct knote *kn)
2423 struct mqueue *mq = FPTOMQ(fp);
2426 if (kn->kn_filter == EVFILT_READ) {
2427 kn->kn_fop = &mq_rfiltops;
2428 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2429 } else if (kn->kn_filter == EVFILT_WRITE) {
2430 kn->kn_fop = &mq_wfiltops;
2431 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2438 filt_mqdetach(struct knote *kn)
2440 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2442 if (kn->kn_filter == EVFILT_READ)
2443 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2444 else if (kn->kn_filter == EVFILT_WRITE)
2445 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2447 panic("filt_mqdetach");
2451 filt_mqread(struct knote *kn, long hint)
2453 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2455 mtx_assert(&mq->mq_mutex, MA_OWNED);
2456 return (mq->mq_curmsgs != 0);
2460 filt_mqwrite(struct knote *kn, long hint)
2462 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2464 mtx_assert(&mq->mq_mutex, MA_OWNED);
2465 return (mq->mq_curmsgs < mq->mq_maxmsg);
2468 static struct fileops mqueueops = {
2469 .fo_read = mqf_read,
2470 .fo_write = mqf_write,
2471 .fo_truncate = mqf_truncate,
2472 .fo_ioctl = mqf_ioctl,
2473 .fo_poll = mqf_poll,
2474 .fo_kqfilter = mqf_kqfilter,
2475 .fo_stat = mqf_stat,
2476 .fo_close = mqf_close
2479 static struct vop_vector mqfs_vnodeops = {
2480 .vop_default = &default_vnodeops,
2481 .vop_access = mqfs_access,
2482 .vop_cachedlookup = mqfs_lookup,
2483 .vop_lookup = vfs_cache_lookup,
2484 .vop_reclaim = mqfs_reclaim,
2485 .vop_create = mqfs_create,
2486 .vop_remove = mqfs_remove,
2487 .vop_inactive = mqfs_inactive,
2488 .vop_open = mqfs_open,
2489 .vop_close = mqfs_close,
2490 .vop_getattr = mqfs_getattr,
2491 .vop_setattr = mqfs_setattr,
2492 .vop_read = mqfs_read,
2493 .vop_write = VOP_EOPNOTSUPP,
2494 .vop_readdir = mqfs_readdir,
2495 .vop_mkdir = VOP_EOPNOTSUPP,
2496 .vop_rmdir = VOP_EOPNOTSUPP
2499 static struct vfsops mqfs_vfsops = {
2500 .vfs_init = mqfs_init,
2501 .vfs_uninit = mqfs_uninit,
2502 .vfs_mount = mqfs_mount,
2503 .vfs_unmount = mqfs_unmount,
2504 .vfs_root = mqfs_root,
2505 .vfs_statfs = mqfs_statfs,
2508 SYSCALL_MODULE_HELPER(kmq_open);
2509 SYSCALL_MODULE_HELPER(kmq_setattr);
2510 SYSCALL_MODULE_HELPER(kmq_timedsend);
2511 SYSCALL_MODULE_HELPER(kmq_timedreceive);
2512 SYSCALL_MODULE_HELPER(kmq_notify);
2513 SYSCALL_MODULE_HELPER(kmq_unlink);
2515 VFS_SET(mqfs_vfsops, mqueuefs, VFCF_SYNTHETIC);
2516 MODULE_VERSION(mqueuefs, 1);