FreeBSD kernel kern code
uipc_mqueue.c
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1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
5 * Copyright (c) 2016-2017 Robert N. M. Watson
6 * All rights reserved.
7 *
8 * Portions of this software were developed by BAE Systems, the University of
9 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
10 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
11 * Computing (TC) research program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35
36/*
37 * POSIX message queue implementation.
38 *
39 * 1) A mqueue filesystem can be mounted, each message queue appears
40 * in mounted directory, user can change queue's permission and
41 * ownership, or remove a queue. Manually creating a file in the
42 * directory causes a message queue to be created in the kernel with
43 * default message queue attributes applied and same name used, this
44 * method is not advocated since mq_open syscall allows user to specify
45 * different attributes. Also the file system can be mounted multiple
46 * times at different mount points but shows same contents.
47 *
48 * 2) Standard POSIX message queue API. The syscalls do not use vfs layer,
49 * but directly operate on internal data structure, this allows user to
50 * use the IPC facility without having to mount mqueue file system.
51 */
52
53#include <sys/cdefs.h>
54__FBSDID("$FreeBSD$");
55
56#include "opt_capsicum.h"
57
58#include <sys/param.h>
59#include <sys/kernel.h>
60#include <sys/systm.h>
61#include <sys/limits.h>
62#include <sys/malloc.h>
63#include <sys/buf.h>
64#include <sys/capsicum.h>
65#include <sys/dirent.h>
66#include <sys/event.h>
67#include <sys/eventhandler.h>
68#include <sys/fcntl.h>
69#include <sys/file.h>
70#include <sys/filedesc.h>
71#include <sys/jail.h>
72#include <sys/lock.h>
73#include <sys/module.h>
74#include <sys/mount.h>
75#include <sys/mqueue.h>
76#include <sys/mutex.h>
77#include <sys/namei.h>
78#include <sys/posix4.h>
79#include <sys/poll.h>
80#include <sys/priv.h>
81#include <sys/proc.h>
82#include <sys/queue.h>
83#include <sys/sysproto.h>
84#include <sys/stat.h>
85#include <sys/syscall.h>
86#include <sys/syscallsubr.h>
87#include <sys/sysent.h>
88#include <sys/sx.h>
89#include <sys/sysctl.h>
90#include <sys/taskqueue.h>
91#include <sys/unistd.h>
92#include <sys/user.h>
93#include <sys/vnode.h>
94#include <machine/atomic.h>
95
96#include <security/audit/audit.h>
97
98FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
99
100/*
101 * Limits and constants
102 */
103#define MQFS_NAMELEN NAME_MAX
104#define MQFS_DELEN (8 + MQFS_NAMELEN)
105
106/* node types */
107typedef enum {
108 mqfstype_none = 0,
109 mqfstype_root,
110 mqfstype_dir,
111 mqfstype_this,
112 mqfstype_parent,
113 mqfstype_file,
114 mqfstype_symlink,
115} mqfs_type_t;
116
117struct mqfs_node;
118
119/*
120 * mqfs_info: describes a mqfs instance
121 */
122struct mqfs_info {
123 struct sx mi_lock;
124 struct mqfs_node *mi_root;
125 struct unrhdr *mi_unrhdr;
126};
127
128struct mqfs_vdata {
129 LIST_ENTRY(mqfs_vdata) mv_link;
130 struct mqfs_node *mv_node;
131 struct vnode *mv_vnode;
132 struct task mv_task;
133};
134
135/*
136 * mqfs_node: describes a node (file or directory) within a mqfs
137 */
138struct mqfs_node {
139 char mn_name[MQFS_NAMELEN+1];
140 struct mqfs_info *mn_info;
141 struct mqfs_node *mn_parent;
142 LIST_HEAD(,mqfs_node) mn_children;
143 LIST_ENTRY(mqfs_node) mn_sibling;
144 LIST_HEAD(,mqfs_vdata) mn_vnodes;
145 const void *mn_pr_root;
146 int mn_refcount;
147 mqfs_type_t mn_type;
148 int mn_deleted;
149 uint32_t mn_fileno;
150 void *mn_data;
151 struct timespec mn_birth;
152 struct timespec mn_ctime;
153 struct timespec mn_atime;
154 struct timespec mn_mtime;
155 uid_t mn_uid;
156 gid_t mn_gid;
157 int mn_mode;
158};
159
160#define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
161#define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
162#define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
163#define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
164 (fp)->f_data)->mn_data))
165
166TAILQ_HEAD(msgq, mqueue_msg);
167
168struct mqueue;
169
170struct mqueue_notifier {
171 LIST_ENTRY(mqueue_notifier) nt_link;
172 struct sigevent nt_sigev;
173 ksiginfo_t nt_ksi;
174 struct proc *nt_proc;
175};
176
177struct mqueue {
178 struct mtx mq_mutex;
179 int mq_flags;
180 long mq_maxmsg;
181 long mq_msgsize;
182 long mq_curmsgs;
183 long mq_totalbytes;
184 struct msgq mq_msgq;
185 int mq_receivers;
186 int mq_senders;
187 struct selinfo mq_rsel;
188 struct selinfo mq_wsel;
189 struct mqueue_notifier *mq_notifier;
190};
191
192#define MQ_RSEL 0x01
193#define MQ_WSEL 0x02
194
195struct mqueue_msg {
196 TAILQ_ENTRY(mqueue_msg) msg_link;
197 unsigned int msg_prio;
198 unsigned int msg_size;
199 /* following real data... */
200};
201
202static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
203 "POSIX real time message queue");
204
205static int default_maxmsg = 10;
206static int default_msgsize = 1024;
207
208static int maxmsg = 100;
209SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
210 &maxmsg, 0, "Default maximum messages in queue");
211static int maxmsgsize = 16384;
212SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
213 &maxmsgsize, 0, "Default maximum message size");
214static int maxmq = 100;
215SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
216 &maxmq, 0, "maximum message queues");
217static int curmq = 0;
218SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
219 &curmq, 0, "current message queue number");
220static int unloadable = 0;
221static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
222
223static eventhandler_tag exit_tag;
224
225/* Only one instance per-system */
226static struct mqfs_info mqfs_data;
227static uma_zone_t mqnode_zone;
228static uma_zone_t mqueue_zone;
229static uma_zone_t mvdata_zone;
230static uma_zone_t mqnoti_zone;
231static struct vop_vector mqfs_vnodeops;
232static struct fileops mqueueops;
233static unsigned mqfs_osd_jail_slot;
234
235/*
236 * Directory structure construction and manipulation
237 */
238#ifdef notyet
239static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
240 const char *name, int namelen, struct ucred *cred, int mode);
241static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
242 const char *name, int namelen, struct ucred *cred, int mode);
243#endif
244
245static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
246 const char *name, int namelen, struct ucred *cred, int mode);
247static int mqfs_destroy(struct mqfs_node *mn);
248static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
249static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
250static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
251static int mqfs_prison_remove(void *obj, void *data);
252
253/*
254 * Message queue construction and maniplation
255 */
256static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
257static void mqueue_free(struct mqueue *mq);
258static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
259 size_t msg_len, unsigned msg_prio, int waitok,
260 const struct timespec *abs_timeout);
261static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
262 size_t msg_len, unsigned *msg_prio, int waitok,
263 const struct timespec *abs_timeout);
264static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
265 int timo);
266static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
267 int timo);
268static void mqueue_send_notification(struct mqueue *mq);
269static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
270static void mq_proc_exit(void *arg, struct proc *p);
271
272/*
273 * kqueue filters
274 */
275static void filt_mqdetach(struct knote *kn);
276static int filt_mqread(struct knote *kn, long hint);
277static int filt_mqwrite(struct knote *kn, long hint);
278
279struct filterops mq_rfiltops = {
280 .f_isfd = 1,
281 .f_detach = filt_mqdetach,
282 .f_event = filt_mqread,
283};
284struct filterops mq_wfiltops = {
285 .f_isfd = 1,
286 .f_detach = filt_mqdetach,
287 .f_event = filt_mqwrite,
288};
289
290/*
291 * Initialize fileno bitmap
292 */
293static void
294mqfs_fileno_init(struct mqfs_info *mi)
295{
296 struct unrhdr *up;
297
298 up = new_unrhdr(1, INT_MAX, NULL);
299 mi->mi_unrhdr = up;
300}
301
302/*
303 * Tear down fileno bitmap
304 */
305static void
306mqfs_fileno_uninit(struct mqfs_info *mi)
307{
308 struct unrhdr *up;
309
310 up = mi->mi_unrhdr;
311 mi->mi_unrhdr = NULL;
312 delete_unrhdr(up);
313}
314
315/*
316 * Allocate a file number
317 */
318static void
319mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
320{
321 /* make sure our parent has a file number */
322 if (mn->mn_parent && !mn->mn_parent->mn_fileno)
323 mqfs_fileno_alloc(mi, mn->mn_parent);
324
325 switch (mn->mn_type) {
326 case mqfstype_root:
327 case mqfstype_dir:
328 case mqfstype_file:
329 case mqfstype_symlink:
330 mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
331 break;
332 case mqfstype_this:
333 KASSERT(mn->mn_parent != NULL,
334 ("mqfstype_this node has no parent"));
335 mn->mn_fileno = mn->mn_parent->mn_fileno;
336 break;
337 case mqfstype_parent:
338 KASSERT(mn->mn_parent != NULL,
339 ("mqfstype_parent node has no parent"));
340 if (mn->mn_parent == mi->mi_root) {
341 mn->mn_fileno = mn->mn_parent->mn_fileno;
342 break;
343 }
344 KASSERT(mn->mn_parent->mn_parent != NULL,
345 ("mqfstype_parent node has no grandparent"));
346 mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
347 break;
348 default:
349 KASSERT(0,
350 ("mqfs_fileno_alloc() called for unknown type node: %d",
351 mn->mn_type));
352 break;
353 }
354}
355
356/*
357 * Release a file number
358 */
359static void
360mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
361{
362 switch (mn->mn_type) {
363 case mqfstype_root:
364 case mqfstype_dir:
365 case mqfstype_file:
366 case mqfstype_symlink:
367 free_unr(mi->mi_unrhdr, mn->mn_fileno);
368 break;
369 case mqfstype_this:
370 case mqfstype_parent:
371 /* ignore these, as they don't "own" their file number */
372 break;
373 default:
374 KASSERT(0,
375 ("mqfs_fileno_free() called for unknown type node: %d",
376 mn->mn_type));
377 break;
378 }
379}
380
381static __inline struct mqfs_node *
382mqnode_alloc(void)
383{
384 return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
385}
386
387static __inline void
388mqnode_free(struct mqfs_node *node)
389{
390 uma_zfree(mqnode_zone, node);
391}
392
393static __inline void
394mqnode_addref(struct mqfs_node *node)
395{
396 atomic_add_int(&node->mn_refcount, 1);
397}
398
399static __inline void
400mqnode_release(struct mqfs_node *node)
401{
402 struct mqfs_info *mqfs;
403 int old, exp;
404
405 mqfs = node->mn_info;
406 old = atomic_fetchadd_int(&node->mn_refcount, -1);
407 if (node->mn_type == mqfstype_dir ||
408 node->mn_type == mqfstype_root)
409 exp = 3; /* include . and .. */
410 else
411 exp = 1;
412 if (old == exp) {
413 int locked = sx_xlocked(&mqfs->mi_lock);
414 if (!locked)
415 sx_xlock(&mqfs->mi_lock);
416 mqfs_destroy(node);
417 if (!locked)
418 sx_xunlock(&mqfs->mi_lock);
419 }
420}
421
422/*
423 * Add a node to a directory
424 */
425static int
426mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
427{
428 KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
429 KASSERT(parent->mn_info != NULL,
430 ("%s(): parent has no mn_info", __func__));
431 KASSERT(parent->mn_type == mqfstype_dir ||
432 parent->mn_type == mqfstype_root,
433 ("%s(): parent is not a directory", __func__));
434
435 node->mn_info = parent->mn_info;
436 node->mn_parent = parent;
437 LIST_INIT(&node->mn_children);
438 LIST_INIT(&node->mn_vnodes);
439 LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
440 mqnode_addref(parent);
441 return (0);
442}
443
444static struct mqfs_node *
445mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
446 int nodetype)
447{
448 struct mqfs_node *node;
449
450 node = mqnode_alloc();
451 strncpy(node->mn_name, name, namelen);
452 node->mn_pr_root = cred->cr_prison->pr_root;
453 node->mn_type = nodetype;
454 node->mn_refcount = 1;
455 vfs_timestamp(&node->mn_birth);
456 node->mn_ctime = node->mn_atime = node->mn_mtime
457 = node->mn_birth;
458 node->mn_uid = cred->cr_uid;
459 node->mn_gid = cred->cr_gid;
460 node->mn_mode = mode;
461 return (node);
462}
463
464/*
465 * Create a file
466 */
467static struct mqfs_node *
468mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
469 struct ucred *cred, int mode)
470{
471 struct mqfs_node *node;
472
473 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
474 if (mqfs_add_node(parent, node) != 0) {
475 mqnode_free(node);
476 return (NULL);
477 }
478 return (node);
479}
480
481/*
482 * Add . and .. to a directory
483 */
484static int
485mqfs_fixup_dir(struct mqfs_node *parent)
486{
487 struct mqfs_node *dir;
488
489 dir = mqnode_alloc();
490 dir->mn_name[0] = '.';
491 dir->mn_type = mqfstype_this;
492 dir->mn_refcount = 1;
493 if (mqfs_add_node(parent, dir) != 0) {
494 mqnode_free(dir);
495 return (-1);
496 }
497
498 dir = mqnode_alloc();
499 dir->mn_name[0] = dir->mn_name[1] = '.';
500 dir->mn_type = mqfstype_parent;
501 dir->mn_refcount = 1;
502
503 if (mqfs_add_node(parent, dir) != 0) {
504 mqnode_free(dir);
505 return (-1);
506 }
507
508 return (0);
509}
510
511#ifdef notyet
512
513/*
514 * Create a directory
515 */
516static struct mqfs_node *
517mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
518 struct ucred *cred, int mode)
519{
520 struct mqfs_node *node;
521
522 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
523 if (mqfs_add_node(parent, node) != 0) {
524 mqnode_free(node);
525 return (NULL);
526 }
527
528 if (mqfs_fixup_dir(node) != 0) {
529 mqfs_destroy(node);
530 return (NULL);
531 }
532 return (node);
533}
534
535/*
536 * Create a symlink
537 */
538static struct mqfs_node *
539mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
540 struct ucred *cred, int mode)
541{
542 struct mqfs_node *node;
543
544 node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
545 if (mqfs_add_node(parent, node) != 0) {
546 mqnode_free(node);
547 return (NULL);
548 }
549 return (node);
550}
551
552#endif
553
554/*
555 * Destroy a node or a tree of nodes
556 */
557static int
558mqfs_destroy(struct mqfs_node *node)
559{
560 struct mqfs_node *parent;
561
562 KASSERT(node != NULL,
563 ("%s(): node is NULL", __func__));
564 KASSERT(node->mn_info != NULL,
565 ("%s(): node has no mn_info", __func__));
566
567 /* destroy children */
568 if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
569 while (! LIST_EMPTY(&node->mn_children))
570 mqfs_destroy(LIST_FIRST(&node->mn_children));
571
572 /* unlink from parent */
573 if ((parent = node->mn_parent) != NULL) {
574 KASSERT(parent->mn_info == node->mn_info,
575 ("%s(): parent has different mn_info", __func__));
576 LIST_REMOVE(node, mn_sibling);
577 }
578
579 if (node->mn_fileno != 0)
580 mqfs_fileno_free(node->mn_info, node);
581 if (node->mn_data != NULL)
582 mqueue_free(node->mn_data);
583 mqnode_free(node);
584 return (0);
585}
586
587/*
588 * Mount a mqfs instance
589 */
590static int
591mqfs_mount(struct mount *mp)
592{
593 struct statfs *sbp;
594
595 if (mp->mnt_flag & MNT_UPDATE)
596 return (EOPNOTSUPP);
597
598 mp->mnt_data = &mqfs_data;
599 MNT_ILOCK(mp);
600 mp->mnt_flag |= MNT_LOCAL;
601 MNT_IUNLOCK(mp);
602 vfs_getnewfsid(mp);
603
604 sbp = &mp->mnt_stat;
605 vfs_mountedfrom(mp, "mqueue");
606 sbp->f_bsize = PAGE_SIZE;
607 sbp->f_iosize = PAGE_SIZE;
608 sbp->f_blocks = 1;
609 sbp->f_bfree = 0;
610 sbp->f_bavail = 0;
611 sbp->f_files = 1;
612 sbp->f_ffree = 0;
613 return (0);
614}
615
616/*
617 * Unmount a mqfs instance
618 */
619static int
620mqfs_unmount(struct mount *mp, int mntflags)
621{
622 int error;
623
624 error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
625 curthread);
626 return (error);
627}
628
629/*
630 * Return a root vnode
631 */
632static int
633mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
634{
635 struct mqfs_info *mqfs;
636 int ret;
637
638 mqfs = VFSTOMQFS(mp);
639 ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
640 return (ret);
641}
642
643/*
644 * Return filesystem stats
645 */
646static int
647mqfs_statfs(struct mount *mp, struct statfs *sbp)
648{
649 /* XXX update statistics */
650 return (0);
651}
652
653/*
654 * Initialize a mqfs instance
655 */
656static int
657mqfs_init(struct vfsconf *vfc)
658{
659 struct mqfs_node *root;
660 struct mqfs_info *mi;
661 osd_method_t methods[PR_MAXMETHOD] = {
662 [PR_METHOD_REMOVE] = mqfs_prison_remove,
663 };
664
665 mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
666 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
667 mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
668 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
669 mvdata_zone = uma_zcreate("mvdata",
670 sizeof(struct mqfs_vdata), NULL, NULL, NULL,
671 NULL, UMA_ALIGN_PTR, 0);
672 mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
673 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
674 mi = &mqfs_data;
675 sx_init(&mi->mi_lock, "mqfs lock");
676 /* set up the root diretory */
677 root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
678 mqfstype_root);
679 root->mn_info = mi;
680 LIST_INIT(&root->mn_children);
681 LIST_INIT(&root->mn_vnodes);
682 mi->mi_root = root;
683 mqfs_fileno_init(mi);
684 mqfs_fileno_alloc(mi, root);
685 mqfs_fixup_dir(root);
686 exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
687 EVENTHANDLER_PRI_ANY);
688 mq_fdclose = mqueue_fdclose;
689 p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
690 mqfs_osd_jail_slot = osd_jail_register(NULL, methods);
691 return (0);
692}
693
694/*
695 * Destroy a mqfs instance
696 */
697static int
698mqfs_uninit(struct vfsconf *vfc)
699{
700 struct mqfs_info *mi;
701
702 if (!unloadable)
703 return (EOPNOTSUPP);
704 osd_jail_deregister(mqfs_osd_jail_slot);
705 EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
706 mi = &mqfs_data;
707 mqfs_destroy(mi->mi_root);
708 mi->mi_root = NULL;
709 mqfs_fileno_uninit(mi);
710 sx_destroy(&mi->mi_lock);
711 uma_zdestroy(mqnode_zone);
712 uma_zdestroy(mqueue_zone);
713 uma_zdestroy(mvdata_zone);
714 uma_zdestroy(mqnoti_zone);
715 return (0);
716}
717
718/*
719 * task routine
720 */
721static void
722do_recycle(void *context, int pending __unused)
723{
724 struct vnode *vp = (struct vnode *)context;
725
726 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
727 vrecycle(vp);
728 VOP_UNLOCK(vp);
729 vdrop(vp);
730}
731
732/*
733 * Allocate a vnode
734 */
735static int
736mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
737{
738 struct mqfs_vdata *vd;
739 struct mqfs_info *mqfs;
740 struct vnode *newvpp;
741 int error;
742
743 mqfs = pn->mn_info;
744 *vpp = NULL;
745 sx_xlock(&mqfs->mi_lock);
746 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
747 if (vd->mv_vnode->v_mount == mp) {
748 vhold(vd->mv_vnode);
749 break;
750 }
751 }
752
753 if (vd != NULL) {
754found:
755 *vpp = vd->mv_vnode;
756 sx_xunlock(&mqfs->mi_lock);
757 error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE);
758 vdrop(*vpp);
759 return (error);
760 }
761 sx_xunlock(&mqfs->mi_lock);
762
763 error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
764 if (error)
765 return (error);
766 vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
767 error = insmntque(newvpp, mp);
768 if (error != 0)
769 return (error);
770
771 sx_xlock(&mqfs->mi_lock);
772 /*
773 * Check if it has already been allocated
774 * while we were blocked.
775 */
776 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
777 if (vd->mv_vnode->v_mount == mp) {
778 vhold(vd->mv_vnode);
779 sx_xunlock(&mqfs->mi_lock);
780
781 vgone(newvpp);
782 vput(newvpp);
783 goto found;
784 }
785 }
786
787 *vpp = newvpp;
788
789 vd = uma_zalloc(mvdata_zone, M_WAITOK);
790 (*vpp)->v_data = vd;
791 vd->mv_vnode = *vpp;
792 vd->mv_node = pn;
793 TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
794 LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
795 mqnode_addref(pn);
796 switch (pn->mn_type) {
797 case mqfstype_root:
798 (*vpp)->v_vflag = VV_ROOT;
799 /* fall through */
800 case mqfstype_dir:
801 case mqfstype_this:
802 case mqfstype_parent:
803 (*vpp)->v_type = VDIR;
804 break;
805 case mqfstype_file:
806 (*vpp)->v_type = VREG;
807 break;
808 case mqfstype_symlink:
809 (*vpp)->v_type = VLNK;
810 break;
811 case mqfstype_none:
812 KASSERT(0, ("mqfs_allocf called for null node\n"));
813 default:
814 panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
815 }
816 sx_xunlock(&mqfs->mi_lock);
817 return (0);
818}
819
820/*
821 * Search a directory entry
822 */
823static struct mqfs_node *
824mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred)
825{
826 struct mqfs_node *pn;
827 const void *pr_root;
828
829 sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
830 pr_root = cred->cr_prison->pr_root;
831 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
832 /* Only match names within the same prison root directory */
833 if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) &&
834 strncmp(pn->mn_name, name, len) == 0 &&
835 pn->mn_name[len] == '\0')
836 return (pn);
837 }
838 return (NULL);
839}
840
841/*
842 * Look up a file or directory.
843 */
844static int
845mqfs_lookupx(struct vop_cachedlookup_args *ap)
846{
847 struct componentname *cnp;
848 struct vnode *dvp, **vpp;
849 struct mqfs_node *pd;
850 struct mqfs_node *pn;
851 struct mqfs_info *mqfs;
852 int nameiop, flags, error, namelen;
853 char *pname;
854 struct thread *td;
855
856 td = curthread;
857 cnp = ap->a_cnp;
858 vpp = ap->a_vpp;
859 dvp = ap->a_dvp;
860 pname = cnp->cn_nameptr;
861 namelen = cnp->cn_namelen;
862 flags = cnp->cn_flags;
863 nameiop = cnp->cn_nameiop;
864 pd = VTON(dvp);
865 pn = NULL;
866 mqfs = pd->mn_info;
867 *vpp = NULLVP;
868
869 if (dvp->v_type != VDIR)
870 return (ENOTDIR);
871
872 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
873 if (error)
874 return (error);
875
876 /* shortcut: check if the name is too long */
877 if (cnp->cn_namelen >= MQFS_NAMELEN)
878 return (ENOENT);
879
880 /* self */
881 if (namelen == 1 && pname[0] == '.') {
882 if ((flags & ISLASTCN) && nameiop != LOOKUP)
883 return (EINVAL);
884 pn = pd;
885 *vpp = dvp;
886 VREF(dvp);
887 return (0);
888 }
889
890 /* parent */
891 if (cnp->cn_flags & ISDOTDOT) {
892 if (dvp->v_vflag & VV_ROOT)
893 return (EIO);
894 if ((flags & ISLASTCN) && nameiop != LOOKUP)
895 return (EINVAL);
896 VOP_UNLOCK(dvp);
897 KASSERT(pd->mn_parent, ("non-root directory has no parent"));
898 pn = pd->mn_parent;
899 error = mqfs_allocv(dvp->v_mount, vpp, pn);
900 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
901 return (error);
902 }
903
904 /* named node */
905 sx_xlock(&mqfs->mi_lock);
906 pn = mqfs_search(pd, pname, namelen, cnp->cn_cred);
907 if (pn != NULL)
908 mqnode_addref(pn);
909 sx_xunlock(&mqfs->mi_lock);
910
911 /* found */
912 if (pn != NULL) {
913 /* DELETE */
914 if (nameiop == DELETE && (flags & ISLASTCN)) {
915 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
916 if (error) {
917 mqnode_release(pn);
918 return (error);
919 }
920 if (*vpp == dvp) {
921 VREF(dvp);
922 *vpp = dvp;
923 mqnode_release(pn);
924 return (0);
925 }
926 }
927
928 /* allocate vnode */
929 error = mqfs_allocv(dvp->v_mount, vpp, pn);
930 mqnode_release(pn);
931 if (error == 0 && cnp->cn_flags & MAKEENTRY)
932 cache_enter(dvp, *vpp, cnp);
933 return (error);
934 }
935
936 /* not found */
937
938 /* will create a new entry in the directory ? */
939 if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
940 && (flags & ISLASTCN)) {
941 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
942 if (error)
943 return (error);
944 cnp->cn_flags |= SAVENAME;
945 return (EJUSTRETURN);
946 }
947 return (ENOENT);
948}
949
950#if 0
951struct vop_lookup_args {
952 struct vop_generic_args a_gen;
953 struct vnode *a_dvp;
954 struct vnode **a_vpp;
955 struct componentname *a_cnp;
956};
957#endif
958
959/*
960 * vnode lookup operation
961 */
962static int
963mqfs_lookup(struct vop_cachedlookup_args *ap)
964{
965 int rc;
966
967 rc = mqfs_lookupx(ap);
968 return (rc);
969}
970
971#if 0
972struct vop_create_args {
973 struct vnode *a_dvp;
974 struct vnode **a_vpp;
975 struct componentname *a_cnp;
976 struct vattr *a_vap;
977};
978#endif
979
980/*
981 * vnode creation operation
982 */
983static int
984mqfs_create(struct vop_create_args *ap)
985{
986 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
987 struct componentname *cnp = ap->a_cnp;
988 struct mqfs_node *pd;
989 struct mqfs_node *pn;
990 struct mqueue *mq;
991 int error;
992
993 pd = VTON(ap->a_dvp);
994 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
995 return (ENOTDIR);
996 mq = mqueue_alloc(NULL);
997 if (mq == NULL)
998 return (EAGAIN);
999 sx_xlock(&mqfs->mi_lock);
1000 if ((cnp->cn_flags & HASBUF) == 0)
1001 panic("%s: no name", __func__);
1002 pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
1003 cnp->cn_cred, ap->a_vap->va_mode);
1004 if (pn == NULL) {
1005 sx_xunlock(&mqfs->mi_lock);
1006 error = ENOSPC;
1007 } else {
1008 mqnode_addref(pn);
1009 sx_xunlock(&mqfs->mi_lock);
1010 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1011 mqnode_release(pn);
1012 if (error)
1013 mqfs_destroy(pn);
1014 else
1015 pn->mn_data = mq;
1016 }
1017 if (error)
1018 mqueue_free(mq);
1019 return (error);
1020}
1021
1022/*
1023 * Remove an entry
1024 */
1025static
1026int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
1027{
1028 struct mqfs_node *parent;
1029 struct mqfs_vdata *vd;
1030 int error = 0;
1031
1032 sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1033
1034 if (ucred->cr_uid != pn->mn_uid &&
1035 (error = priv_check_cred(ucred, PRIV_MQ_ADMIN)) != 0)
1036 error = EACCES;
1037 else if (!pn->mn_deleted) {
1038 parent = pn->mn_parent;
1039 pn->mn_parent = NULL;
1040 pn->mn_deleted = 1;
1041 LIST_REMOVE(pn, mn_sibling);
1042 LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1043 cache_purge(vd->mv_vnode);
1044 vhold(vd->mv_vnode);
1045 taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1046 }
1047 mqnode_release(pn);
1048 mqnode_release(parent);
1049 } else
1050 error = ENOENT;
1051 return (error);
1052}
1053
1054#if 0
1055struct vop_remove_args {
1056 struct vnode *a_dvp;
1057 struct vnode *a_vp;
1058 struct componentname *a_cnp;
1059};
1060#endif
1061
1062/*
1063 * vnode removal operation
1064 */
1065static int
1066mqfs_remove(struct vop_remove_args *ap)
1067{
1068 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1069 struct mqfs_node *pn;
1070 int error;
1071
1072 if (ap->a_vp->v_type == VDIR)
1073 return (EPERM);
1074 pn = VTON(ap->a_vp);
1075 sx_xlock(&mqfs->mi_lock);
1076 error = do_unlink(pn, ap->a_cnp->cn_cred);
1077 sx_xunlock(&mqfs->mi_lock);
1078 return (error);
1079}
1080
1081#if 0
1082struct vop_inactive_args {
1083 struct vnode *a_vp;
1084 struct thread *a_td;
1085};
1086#endif
1087
1088static int
1089mqfs_inactive(struct vop_inactive_args *ap)
1090{
1091 struct mqfs_node *pn = VTON(ap->a_vp);
1092
1093 if (pn->mn_deleted)
1094 vrecycle(ap->a_vp);
1095 return (0);
1096}
1097
1098#if 0
1099struct vop_reclaim_args {
1100 struct vop_generic_args a_gen;
1101 struct vnode *a_vp;
1102};
1103#endif
1104
1105static int
1106mqfs_reclaim(struct vop_reclaim_args *ap)
1107{
1108 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1109 struct vnode *vp = ap->a_vp;
1110 struct mqfs_node *pn;
1111 struct mqfs_vdata *vd;
1112
1113 vd = vp->v_data;
1114 pn = vd->mv_node;
1115 sx_xlock(&mqfs->mi_lock);
1116 vp->v_data = NULL;
1117 LIST_REMOVE(vd, mv_link);
1118 uma_zfree(mvdata_zone, vd);
1119 mqnode_release(pn);
1120 sx_xunlock(&mqfs->mi_lock);
1121 return (0);
1122}
1123
1124#if 0
1125struct vop_open_args {
1126 struct vop_generic_args a_gen;
1127 struct vnode *a_vp;
1128 int a_mode;
1129 struct ucred *a_cred;
1130 struct thread *a_td;
1131 struct file *a_fp;
1132};
1133#endif
1134
1135static int
1136mqfs_open(struct vop_open_args *ap)
1137{
1138 return (0);
1139}
1140
1141#if 0
1142struct vop_close_args {
1143 struct vop_generic_args a_gen;
1144 struct vnode *a_vp;
1145 int a_fflag;
1146 struct ucred *a_cred;
1147 struct thread *a_td;
1148};
1149#endif
1150
1151static int
1152mqfs_close(struct vop_close_args *ap)
1153{
1154 return (0);
1155}
1156
1157#if 0
1158struct vop_access_args {
1159 struct vop_generic_args a_gen;
1160 struct vnode *a_vp;
1161 accmode_t a_accmode;
1162 struct ucred *a_cred;
1163 struct thread *a_td;
1164};
1165#endif
1166
1167/*
1168 * Verify permissions
1169 */
1170static int
1171mqfs_access(struct vop_access_args *ap)
1172{
1173 struct vnode *vp = ap->a_vp;
1174 struct vattr vattr;
1175 int error;
1176
1177 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1178 if (error)
1179 return (error);
1180 error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid, vattr.va_gid,
1181 ap->a_accmode, ap->a_cred);
1182 return (error);
1183}
1184
1185#if 0
1186struct vop_getattr_args {
1187 struct vop_generic_args a_gen;
1188 struct vnode *a_vp;
1189 struct vattr *a_vap;
1190 struct ucred *a_cred;
1191};
1192#endif
1193
1194/*
1195 * Get file attributes
1196 */
1197static int
1198mqfs_getattr(struct vop_getattr_args *ap)
1199{
1200 struct vnode *vp = ap->a_vp;
1201 struct mqfs_node *pn = VTON(vp);
1202 struct vattr *vap = ap->a_vap;
1203 int error = 0;
1204
1205 vap->va_type = vp->v_type;
1206 vap->va_mode = pn->mn_mode;
1207 vap->va_nlink = 1;
1208 vap->va_uid = pn->mn_uid;
1209 vap->va_gid = pn->mn_gid;
1210 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1211 vap->va_fileid = pn->mn_fileno;
1212 vap->va_size = 0;
1213 vap->va_blocksize = PAGE_SIZE;
1214 vap->va_bytes = vap->va_size = 0;
1215 vap->va_atime = pn->mn_atime;
1216 vap->va_mtime = pn->mn_mtime;
1217 vap->va_ctime = pn->mn_ctime;
1218 vap->va_birthtime = pn->mn_birth;
1219 vap->va_gen = 0;
1220 vap->va_flags = 0;
1221 vap->va_rdev = NODEV;
1222 vap->va_bytes = 0;
1223 vap->va_filerev = 0;
1224 return (error);
1225}
1226
1227#if 0
1228struct vop_setattr_args {
1229 struct vop_generic_args a_gen;
1230 struct vnode *a_vp;
1231 struct vattr *a_vap;
1232 struct ucred *a_cred;
1233};
1234#endif
1235/*
1236 * Set attributes
1237 */
1238static int
1239mqfs_setattr(struct vop_setattr_args *ap)
1240{
1241 struct mqfs_node *pn;
1242 struct vattr *vap;
1243 struct vnode *vp;
1244 struct thread *td;
1245 int c, error;
1246 uid_t uid;
1247 gid_t gid;
1248
1249 td = curthread;
1250 vap = ap->a_vap;
1251 vp = ap->a_vp;
1252 if ((vap->va_type != VNON) ||
1253 (vap->va_nlink != VNOVAL) ||
1254 (vap->va_fsid != VNOVAL) ||
1255 (vap->va_fileid != VNOVAL) ||
1256 (vap->va_blocksize != VNOVAL) ||
1257 (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1258 (vap->va_rdev != VNOVAL) ||
1259 ((int)vap->va_bytes != VNOVAL) ||
1260 (vap->va_gen != VNOVAL)) {
1261 return (EINVAL);
1262 }
1263
1264 pn = VTON(vp);
1265
1266 error = c = 0;
1267 if (vap->va_uid == (uid_t)VNOVAL)
1268 uid = pn->mn_uid;
1269 else
1270 uid = vap->va_uid;
1271 if (vap->va_gid == (gid_t)VNOVAL)
1272 gid = pn->mn_gid;
1273 else
1274 gid = vap->va_gid;
1275
1276 if (uid != pn->mn_uid || gid != pn->mn_gid) {
1277 /*
1278 * To modify the ownership of a file, must possess VADMIN
1279 * for that file.
1280 */
1281 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1282 return (error);
1283
1284 /*
1285 * XXXRW: Why is there a privilege check here: shouldn't the
1286 * check in VOP_ACCESS() be enough? Also, are the group bits
1287 * below definitely right?
1288 */
1289 if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1290 (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1291 (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1292 return (error);
1293 pn->mn_uid = uid;
1294 pn->mn_gid = gid;
1295 c = 1;
1296 }
1297
1298 if (vap->va_mode != (mode_t)VNOVAL) {
1299 if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1300 (error = priv_check(td, PRIV_MQ_ADMIN)))
1301 return (error);
1302 pn->mn_mode = vap->va_mode;
1303 c = 1;
1304 }
1305
1306 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1307 /* See the comment in ufs_vnops::ufs_setattr(). */
1308 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1309 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1310 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1311 return (error);
1312 if (vap->va_atime.tv_sec != VNOVAL) {
1313 pn->mn_atime = vap->va_atime;
1314 }
1315 if (vap->va_mtime.tv_sec != VNOVAL) {
1316 pn->mn_mtime = vap->va_mtime;
1317 }
1318 c = 1;
1319 }
1320 if (c) {
1321 vfs_timestamp(&pn->mn_ctime);
1322 }
1323 return (0);
1324}
1325
1326#if 0
1327struct vop_read_args {
1328 struct vop_generic_args a_gen;
1329 struct vnode *a_vp;
1330 struct uio *a_uio;
1331 int a_ioflag;
1332 struct ucred *a_cred;
1333};
1334#endif
1335
1336/*
1337 * Read from a file
1338 */
1339static int
1340mqfs_read(struct vop_read_args *ap)
1341{
1342 char buf[80];
1343 struct vnode *vp = ap->a_vp;
1344 struct uio *uio = ap->a_uio;
1345 struct mqueue *mq;
1346 int len, error;
1347
1348 if (vp->v_type != VREG)
1349 return (EINVAL);
1350
1351 mq = VTOMQ(vp);
1352 snprintf(buf, sizeof(buf),
1353 "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1354 mq->mq_totalbytes,
1355 mq->mq_maxmsg,
1356 mq->mq_curmsgs,
1357 mq->mq_msgsize);
1358 buf[sizeof(buf)-1] = '\0';
1359 len = strlen(buf);
1360 error = uiomove_frombuf(buf, len, uio);
1361 return (error);
1362}
1363
1364#if 0
1365struct vop_readdir_args {
1366 struct vop_generic_args a_gen;
1367 struct vnode *a_vp;
1368 struct uio *a_uio;
1369 struct ucred *a_cred;
1370 int *a_eofflag;
1371 int *a_ncookies;
1372 uint64_t **a_cookies;
1373};
1374#endif
1375
1376/*
1377 * Return directory entries.
1378 */
1379static int
1380mqfs_readdir(struct vop_readdir_args *ap)
1381{
1382 struct vnode *vp;
1383 struct mqfs_info *mi;
1384 struct mqfs_node *pd;
1385 struct mqfs_node *pn;
1386 struct dirent entry;
1387 struct uio *uio;
1388 const void *pr_root;
1389 int *tmp_ncookies = NULL;
1390 off_t offset;
1391 int error, i;
1392
1393 vp = ap->a_vp;
1394 mi = VFSTOMQFS(vp->v_mount);
1395 pd = VTON(vp);
1396 uio = ap->a_uio;
1397
1398 if (vp->v_type != VDIR)
1399 return (ENOTDIR);
1400
1401 if (uio->uio_offset < 0)
1402 return (EINVAL);
1403
1404 if (ap->a_ncookies != NULL) {
1405 tmp_ncookies = ap->a_ncookies;
1406 *ap->a_ncookies = 0;
1407 ap->a_ncookies = NULL;
1408 }
1409
1410 error = 0;
1411 offset = 0;
1412
1413 pr_root = ap->a_cred->cr_prison->pr_root;
1414 sx_xlock(&mi->mi_lock);
1415
1416 LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1417 entry.d_reclen = sizeof(entry);
1418
1419 /*
1420 * Only show names within the same prison root directory
1421 * (or not associated with a prison, e.g. "." and "..").
1422 */
1423 if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root)
1424 continue;
1425 if (!pn->mn_fileno)
1426 mqfs_fileno_alloc(mi, pn);
1427 entry.d_fileno = pn->mn_fileno;
1428 entry.d_off = offset + entry.d_reclen;
1429 for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1430 entry.d_name[i] = pn->mn_name[i];
1431 entry.d_namlen = i;
1432 switch (pn->mn_type) {
1433 case mqfstype_root:
1434 case mqfstype_dir:
1435 case mqfstype_this:
1436 case mqfstype_parent:
1437 entry.d_type = DT_DIR;
1438 break;
1439 case mqfstype_file:
1440 entry.d_type = DT_REG;
1441 break;
1442 case mqfstype_symlink:
1443 entry.d_type = DT_LNK;
1444 break;
1445 default:
1446 panic("%s has unexpected node type: %d", pn->mn_name,
1447 pn->mn_type);
1448 }
1449 dirent_terminate(&entry);
1450 if (entry.d_reclen > uio->uio_resid)
1451 break;
1452 if (offset >= uio->uio_offset) {
1453 error = vfs_read_dirent(ap, &entry, offset);
1454 if (error)
1455 break;
1456 }
1457 offset += entry.d_reclen;
1458 }
1459 sx_xunlock(&mi->mi_lock);
1460
1461 uio->uio_offset = offset;
1462
1463 if (tmp_ncookies != NULL)
1464 ap->a_ncookies = tmp_ncookies;
1465
1466 return (error);
1467}
1468
1469#ifdef notyet
1470
1471#if 0
1472struct vop_mkdir_args {
1473 struct vnode *a_dvp;
1474 struvt vnode **a_vpp;
1475 struvt componentname *a_cnp;
1476 struct vattr *a_vap;
1477};
1478#endif
1479
1480/*
1481 * Create a directory.
1482 */
1483static int
1484mqfs_mkdir(struct vop_mkdir_args *ap)
1485{
1486 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1487 struct componentname *cnp = ap->a_cnp;
1488 struct mqfs_node *pd = VTON(ap->a_dvp);
1489 struct mqfs_node *pn;
1490 int error;
1491
1492 if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1493 return (ENOTDIR);
1494 sx_xlock(&mqfs->mi_lock);
1495 if ((cnp->cn_flags & HASBUF) == 0)
1496 panic("%s: no name", __func__);
1497 pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1498 ap->a_vap->cn_cred, ap->a_vap->va_mode);
1499 if (pn != NULL)
1500 mqnode_addref(pn);
1501 sx_xunlock(&mqfs->mi_lock);
1502 if (pn == NULL) {
1503 error = ENOSPC;
1504 } else {
1505 error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1506 mqnode_release(pn);
1507 }
1508 return (error);
1509}
1510
1511#if 0
1512struct vop_rmdir_args {
1513 struct vnode *a_dvp;
1514 struct vnode *a_vp;
1515 struct componentname *a_cnp;
1516};
1517#endif
1518
1519/*
1520 * Remove a directory.
1521 */
1522static int
1523mqfs_rmdir(struct vop_rmdir_args *ap)
1524{
1525 struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1526 struct mqfs_node *pn = VTON(ap->a_vp);
1527 struct mqfs_node *pt;
1528
1529 if (pn->mn_type != mqfstype_dir)
1530 return (ENOTDIR);
1531
1532 sx_xlock(&mqfs->mi_lock);
1533 if (pn->mn_deleted) {
1534 sx_xunlock(&mqfs->mi_lock);
1535 return (ENOENT);
1536 }
1537
1538 pt = LIST_FIRST(&pn->mn_children);
1539 pt = LIST_NEXT(pt, mn_sibling);
1540 pt = LIST_NEXT(pt, mn_sibling);
1541 if (pt != NULL) {
1542 sx_xunlock(&mqfs->mi_lock);
1543 return (ENOTEMPTY);
1544 }
1545 pt = pn->mn_parent;
1546 pn->mn_parent = NULL;
1547 pn->mn_deleted = 1;
1548 LIST_REMOVE(pn, mn_sibling);
1549 mqnode_release(pn);
1550 mqnode_release(pt);
1551 sx_xunlock(&mqfs->mi_lock);
1552 cache_purge(ap->a_vp);
1553 return (0);
1554}
1555
1556#endif /* notyet */
1557
1558/*
1559 * See if this prison root is obsolete, and clean up associated queues if it is.
1560 */
1561static int
1562mqfs_prison_remove(void *obj, void *data __unused)
1563{
1564 const struct prison *pr = obj;
1565 struct prison *tpr;
1566 struct mqfs_node *pn, *tpn;
1567 struct vnode *pr_root;
1568
1569 pr_root = pr->pr_root;
1570 if (pr->pr_parent->pr_root == pr_root)
1571 return (0);
1572 TAILQ_FOREACH(tpr, &allprison, pr_list) {
1573 if (tpr != pr && tpr->pr_root == pr_root)
1574 return (0);
1575 }
1576 /*
1577 * No jails are rooted in this directory anymore,
1578 * so no queues should be either.
1579 */
1580 sx_xlock(&mqfs_data.mi_lock);
1581 LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children,
1582 mn_sibling, tpn) {
1583 if (pn->mn_pr_root == pr_root)
1584 (void)do_unlink(pn, curthread->td_ucred);
1585 }
1586 sx_xunlock(&mqfs_data.mi_lock);
1587 return (0);
1588}
1589
1590/*
1591 * Allocate a message queue
1592 */
1593static struct mqueue *
1594mqueue_alloc(const struct mq_attr *attr)
1595{
1596 struct mqueue *mq;
1597
1598 if (curmq >= maxmq)
1599 return (NULL);
1600 mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1601 TAILQ_INIT(&mq->mq_msgq);
1602 if (attr != NULL) {
1603 mq->mq_maxmsg = attr->mq_maxmsg;
1604 mq->mq_msgsize = attr->mq_msgsize;
1605 } else {
1606 mq->mq_maxmsg = default_maxmsg;
1607 mq->mq_msgsize = default_msgsize;
1608 }
1609 mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1610 knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1611 knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1612 atomic_add_int(&curmq, 1);
1613 return (mq);
1614}
1615
1616/*
1617 * Destroy a message queue
1618 */
1619static void
1620mqueue_free(struct mqueue *mq)
1621{
1622 struct mqueue_msg *msg;
1623
1624 while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1625 TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1626 free(msg, M_MQUEUEDATA);
1627 }
1628
1629 mtx_destroy(&mq->mq_mutex);
1630 seldrain(&mq->mq_rsel);
1631 seldrain(&mq->mq_wsel);
1632 knlist_destroy(&mq->mq_rsel.si_note);
1633 knlist_destroy(&mq->mq_wsel.si_note);
1634 uma_zfree(mqueue_zone, mq);
1635 atomic_add_int(&curmq, -1);
1636}
1637
1638/*
1639 * Load a message from user space
1640 */
1641static struct mqueue_msg *
1642mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1643{
1644 struct mqueue_msg *msg;
1645 size_t len;
1646 int error;
1647
1648 len = sizeof(struct mqueue_msg) + msg_size;
1649 msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1650 error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1651 msg_size);
1652 if (error) {
1653 free(msg, M_MQUEUEDATA);
1654 msg = NULL;
1655 } else {
1656 msg->msg_size = msg_size;
1657 msg->msg_prio = msg_prio;
1658 }
1659 return (msg);
1660}
1661
1662/*
1663 * Save a message to user space
1664 */
1665static int
1666mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1667{
1668 int error;
1669
1670 error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1671 msg->msg_size);
1672 if (error == 0 && msg_prio != NULL)
1673 error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1674 return (error);
1675}
1676
1677/*
1678 * Free a message's memory
1679 */
1680static __inline void
1681mqueue_freemsg(struct mqueue_msg *msg)
1682{
1683 free(msg, M_MQUEUEDATA);
1684}
1685
1686/*
1687 * Send a message. if waitok is false, thread will not be
1688 * blocked if there is no data in queue, otherwise, absolute
1689 * time will be checked.
1690 */
1691int
1692mqueue_send(struct mqueue *mq, const char *msg_ptr,
1693 size_t msg_len, unsigned msg_prio, int waitok,
1694 const struct timespec *abs_timeout)
1695{
1696 struct mqueue_msg *msg;
1697 struct timespec ts, ts2;
1698 struct timeval tv;
1699 int error;
1700
1701 if (msg_prio >= MQ_PRIO_MAX)
1702 return (EINVAL);
1703 if (msg_len > mq->mq_msgsize)
1704 return (EMSGSIZE);
1705 msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1706 if (msg == NULL)
1707 return (EFAULT);
1708
1709 /* O_NONBLOCK case */
1710 if (!waitok) {
1711 error = _mqueue_send(mq, msg, -1);
1712 if (error)
1713 goto bad;
1714 return (0);
1715 }
1716
1717 /* we allow a null timeout (wait forever) */
1718 if (abs_timeout == NULL) {
1719 error = _mqueue_send(mq, msg, 0);
1720 if (error)
1721 goto bad;
1722 return (0);
1723 }
1724
1725 /* send it before checking time */
1726 error = _mqueue_send(mq, msg, -1);
1727 if (error == 0)
1728 return (0);
1729
1730 if (error != EAGAIN)
1731 goto bad;
1732
1733 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1734 error = EINVAL;
1735 goto bad;
1736 }
1737 for (;;) {
1738 getnanotime(&ts);
1739 timespecsub(abs_timeout, &ts, &ts2);
1740 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1741 error = ETIMEDOUT;
1742 break;
1743 }
1744 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1745 error = _mqueue_send(mq, msg, tvtohz(&tv));
1746 if (error != ETIMEDOUT)
1747 break;
1748 }
1749 if (error == 0)
1750 return (0);
1751bad:
1752 mqueue_freemsg(msg);
1753 return (error);
1754}
1755
1756/*
1757 * Common routine to send a message
1758 */
1759static int
1760_mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1761{
1762 struct mqueue_msg *msg2;
1763 int error = 0;
1764
1765 mtx_lock(&mq->mq_mutex);
1766 while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1767 if (timo < 0) {
1768 mtx_unlock(&mq->mq_mutex);
1769 return (EAGAIN);
1770 }
1771 mq->mq_senders++;
1772 error = msleep(&mq->mq_senders, &mq->mq_mutex,
1773 PCATCH, "mqsend", timo);
1774 mq->mq_senders--;
1775 if (error == EAGAIN)
1776 error = ETIMEDOUT;
1777 }
1778 if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1779 mtx_unlock(&mq->mq_mutex);
1780 return (error);
1781 }
1782 error = 0;
1783 if (TAILQ_EMPTY(&mq->mq_msgq)) {
1784 TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1785 } else {
1786 if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1787 TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1788 } else {
1789 TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1790 if (msg2->msg_prio < msg->msg_prio)
1791 break;
1792 }
1793 TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1794 }
1795 }
1796 mq->mq_curmsgs++;
1797 mq->mq_totalbytes += msg->msg_size;
1798 if (mq->mq_receivers)
1799 wakeup_one(&mq->mq_receivers);
1800 else if (mq->mq_notifier != NULL)
1801 mqueue_send_notification(mq);
1802 if (mq->mq_flags & MQ_RSEL) {
1803 mq->mq_flags &= ~MQ_RSEL;
1804 selwakeup(&mq->mq_rsel);
1805 }
1806 KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1807 mtx_unlock(&mq->mq_mutex);
1808 return (0);
1809}
1810
1811/*
1812 * Send realtime a signal to process which registered itself
1813 * successfully by mq_notify.
1814 */
1815static void
1816mqueue_send_notification(struct mqueue *mq)
1817{
1818 struct mqueue_notifier *nt;
1819 struct thread *td;
1820 struct proc *p;
1821 int error;
1822
1823 mtx_assert(&mq->mq_mutex, MA_OWNED);
1824 nt = mq->mq_notifier;
1825 if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1826 p = nt->nt_proc;
1827 error = sigev_findtd(p, &nt->nt_sigev, &td);
1828 if (error) {
1829 mq->mq_notifier = NULL;
1830 return;
1831 }
1832 if (!KSI_ONQ(&nt->nt_ksi)) {
1833 ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1834 tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1835 }
1836 PROC_UNLOCK(p);
1837 }
1838 mq->mq_notifier = NULL;
1839}
1840
1841/*
1842 * Get a message. if waitok is false, thread will not be
1843 * blocked if there is no data in queue, otherwise, absolute
1844 * time will be checked.
1845 */
1846int
1847mqueue_receive(struct mqueue *mq, char *msg_ptr,
1848 size_t msg_len, unsigned *msg_prio, int waitok,
1849 const struct timespec *abs_timeout)
1850{
1851 struct mqueue_msg *msg;
1852 struct timespec ts, ts2;
1853 struct timeval tv;
1854 int error;
1855
1856 if (msg_len < mq->mq_msgsize)
1857 return (EMSGSIZE);
1858
1859 /* O_NONBLOCK case */
1860 if (!waitok) {
1861 error = _mqueue_recv(mq, &msg, -1);
1862 if (error)
1863 return (error);
1864 goto received;
1865 }
1866
1867 /* we allow a null timeout (wait forever). */
1868 if (abs_timeout == NULL) {
1869 error = _mqueue_recv(mq, &msg, 0);
1870 if (error)
1871 return (error);
1872 goto received;
1873 }
1874
1875 /* try to get a message before checking time */
1876 error = _mqueue_recv(mq, &msg, -1);
1877 if (error == 0)
1878 goto received;
1879
1880 if (error != EAGAIN)
1881 return (error);
1882
1883 if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1884 error = EINVAL;
1885 return (error);
1886 }
1887
1888 for (;;) {
1889 getnanotime(&ts);
1890 timespecsub(abs_timeout, &ts, &ts2);
1891 if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1892 error = ETIMEDOUT;
1893 return (error);
1894 }
1895 TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1896 error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1897 if (error == 0)
1898 break;
1899 if (error != ETIMEDOUT)
1900 return (error);
1901 }
1902
1903received:
1904 error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1905 if (error == 0) {
1906 curthread->td_retval[0] = msg->msg_size;
1907 curthread->td_retval[1] = 0;
1908 }
1909 mqueue_freemsg(msg);
1910 return (error);
1911}
1912
1913/*
1914 * Common routine to receive a message
1915 */
1916static int
1917_mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1918{
1919 int error = 0;
1920
1921 mtx_lock(&mq->mq_mutex);
1922 while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1923 if (timo < 0) {
1924 mtx_unlock(&mq->mq_mutex);
1925 return (EAGAIN);
1926 }
1927 mq->mq_receivers++;
1928 error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1929 PCATCH, "mqrecv", timo);
1930 mq->mq_receivers--;
1931 if (error == EAGAIN)
1932 error = ETIMEDOUT;
1933 }
1934 if (*msg != NULL) {
1935 error = 0;
1936 TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1937 mq->mq_curmsgs--;
1938 mq->mq_totalbytes -= (*msg)->msg_size;
1939 if (mq->mq_senders)
1940 wakeup_one(&mq->mq_senders);
1941 if (mq->mq_flags & MQ_WSEL) {
1942 mq->mq_flags &= ~MQ_WSEL;
1943 selwakeup(&mq->mq_wsel);
1944 }
1945 KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1946 }
1947 if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1948 !TAILQ_EMPTY(&mq->mq_msgq)) {
1949 mqueue_send_notification(mq);
1950 }
1951 mtx_unlock(&mq->mq_mutex);
1952 return (error);
1953}
1954
1955static __inline struct mqueue_notifier *
1956notifier_alloc(void)
1957{
1958 return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1959}
1960
1961static __inline void
1962notifier_free(struct mqueue_notifier *p)
1963{
1964 uma_zfree(mqnoti_zone, p);
1965}
1966
1967static struct mqueue_notifier *
1968notifier_search(struct proc *p, int fd)
1969{
1970 struct mqueue_notifier *nt;
1971
1972 LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1973 if (nt->nt_ksi.ksi_mqd == fd)
1974 break;
1975 }
1976 return (nt);
1977}
1978
1979static __inline void
1980notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1981{
1982 LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1983}
1984
1985static __inline void
1986notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1987{
1988 LIST_REMOVE(nt, nt_link);
1989 notifier_free(nt);
1990}
1991
1992static void
1993notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1994{
1995 struct mqueue_notifier *nt;
1996
1997 mtx_assert(&mq->mq_mutex, MA_OWNED);
1998 PROC_LOCK(p);
1999 nt = notifier_search(p, fd);
2000 if (nt != NULL) {
2001 if (mq->mq_notifier == nt)
2002 mq->mq_notifier = NULL;
2003 sigqueue_take(&nt->nt_ksi);
2004 notifier_delete(p, nt);
2005 }
2006 PROC_UNLOCK(p);
2007}
2008
2009static int
2010kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
2011 const struct mq_attr *attr)
2012{
2013 char path[MQFS_NAMELEN + 1];
2014 struct mqfs_node *pn;
2015 struct pwddesc *pdp;
2016 struct file *fp;
2017 struct mqueue *mq;
2018 int fd, error, len, cmode;
2019
2020 AUDIT_ARG_FFLAGS(flags);
2021 AUDIT_ARG_MODE(mode);
2022
2023 pdp = td->td_proc->p_pd;
2024 cmode = (((mode & ~pdp->pd_cmask) & ALLPERMS) & ~S_ISTXT);
2025 mq = NULL;
2026 if ((flags & O_CREAT) != 0 && attr != NULL) {
2027 if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
2028 return (EINVAL);
2029 if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
2030 return (EINVAL);
2031 }
2032
2033 error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
2034 if (error)
2035 return (error);
2036
2037 /*
2038 * The first character of name must be a slash (/) character
2039 * and the remaining characters of name cannot include any slash
2040 * characters.
2041 */
2042 len = strlen(path);
2043 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2044 return (EINVAL);
2045 /*
2046 * "." and ".." are magic directories, populated on the fly, and cannot
2047 * be opened as queues.
2048 */
2049 if (strcmp(path, "/.") == 0 || strcmp(path, "/..") == 0)
2050 return (EINVAL);
2051 AUDIT_ARG_UPATH1_CANON(path);
2052
2053 error = falloc(td, &fp, &fd, O_CLOEXEC);
2054 if (error)
2055 return (error);
2056
2057 sx_xlock(&mqfs_data.mi_lock);
2058 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2059 if (pn == NULL) {
2060 if (!(flags & O_CREAT)) {
2061 error = ENOENT;
2062 } else {
2063 mq = mqueue_alloc(attr);
2064 if (mq == NULL) {
2065 error = ENFILE;
2066 } else {
2067 pn = mqfs_create_file(mqfs_data.mi_root,
2068 path + 1, len - 1, td->td_ucred,
2069 cmode);
2070 if (pn == NULL) {
2071 error = ENOSPC;
2072 mqueue_free(mq);
2073 }
2074 }
2075 }
2076
2077 if (error == 0) {
2078 pn->mn_data = mq;
2079 }
2080 } else {
2081 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2082 error = EEXIST;
2083 } else {
2084 accmode_t accmode = 0;
2085
2086 if (flags & FREAD)
2087 accmode |= VREAD;
2088 if (flags & FWRITE)
2089 accmode |= VWRITE;
2090 error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2091 pn->mn_gid, accmode, td->td_ucred);
2092 }
2093 }
2094
2095 if (error) {
2096 sx_xunlock(&mqfs_data.mi_lock);
2097 fdclose(td, fp, fd);
2098 fdrop(fp, td);
2099 return (error);
2100 }
2101
2102 mqnode_addref(pn);
2103 sx_xunlock(&mqfs_data.mi_lock);
2104
2105 finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2106 &mqueueops);
2107
2108 td->td_retval[0] = fd;
2109 fdrop(fp, td);
2110 return (0);
2111}
2112
2113/*
2114 * Syscall to open a message queue.
2115 */
2116int
2117sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
2118{
2119 struct mq_attr attr;
2120 int flags, error;
2121
2122 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2123 return (EINVAL);
2124 flags = FFLAGS(uap->flags);
2125 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2126 error = copyin(uap->attr, &attr, sizeof(attr));
2127 if (error)
2128 return (error);
2129 }
2130 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2131 uap->attr != NULL ? &attr : NULL));
2132}
2133
2134/*
2135 * Syscall to unlink a message queue.
2136 */
2137int
2138sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2139{
2140 char path[MQFS_NAMELEN+1];
2141 struct mqfs_node *pn;
2142 int error, len;
2143
2144 error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2145 if (error)
2146 return (error);
2147
2148 len = strlen(path);
2149 if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
2150 return (EINVAL);
2151 if (strcmp(path, "/.") == 0 || strcmp(path, "/..") == 0)
2152 return (EINVAL);
2153 AUDIT_ARG_UPATH1_CANON(path);
2154
2155 sx_xlock(&mqfs_data.mi_lock);
2156 pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
2157 if (pn != NULL)
2158 error = do_unlink(pn, td->td_ucred);
2159 else
2160 error = ENOENT;
2161 sx_xunlock(&mqfs_data.mi_lock);
2162 return (error);
2163}
2164
2165typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **);
2166
2167/*
2168 * Get message queue by giving file slot
2169 */
2170static int
2171_getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func,
2172 struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2173{
2174 struct mqfs_node *pn;
2175 int error;
2176
2177 error = func(td, fd, rightsp, fpp);
2178 if (error)
2179 return (error);
2180 if (&mqueueops != (*fpp)->f_ops) {
2181 fdrop(*fpp, td);
2182 return (EBADF);
2183 }
2184 pn = (*fpp)->f_data;
2185 if (ppn)
2186 *ppn = pn;
2187 if (pmq)
2188 *pmq = pn->mn_data;
2189 return (0);
2190}
2191
2192static __inline int
2193getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2194 struct mqueue **pmq)
2195{
2196
2197 return _getmq(td, fd, &cap_event_rights, fget,
2198 fpp, ppn, pmq);
2199}
2200
2201static __inline int
2202getmq_read(struct thread *td, int fd, struct file **fpp,
2203 struct mqfs_node **ppn, struct mqueue **pmq)
2204{
2205
2206 return _getmq(td, fd, &cap_read_rights, fget_read,
2207 fpp, ppn, pmq);
2208}
2209
2210static __inline int
2211getmq_write(struct thread *td, int fd, struct file **fpp,
2212 struct mqfs_node **ppn, struct mqueue **pmq)
2213{
2214
2215 return _getmq(td, fd, &cap_write_rights, fget_write,
2216 fpp, ppn, pmq);
2217}
2218
2219static int
2220kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2221 struct mq_attr *oattr)
2222{
2223 struct mqueue *mq;
2224 struct file *fp;
2225 u_int oflag, flag;
2226 int error;
2227
2228 AUDIT_ARG_FD(mqd);
2229 if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2230 return (EINVAL);
2231 error = getmq(td, mqd, &fp, NULL, &mq);
2232 if (error)
2233 return (error);
2234 oattr->mq_maxmsg = mq->mq_maxmsg;
2235 oattr->mq_msgsize = mq->mq_msgsize;
2236 oattr->mq_curmsgs = mq->mq_curmsgs;
2237 if (attr != NULL) {
2238 do {
2239 oflag = flag = fp->f_flag;
2240 flag &= ~O_NONBLOCK;
2241 flag |= (attr->mq_flags & O_NONBLOCK);
2242 } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2243 } else
2244 oflag = fp->f_flag;
2245 oattr->mq_flags = (O_NONBLOCK & oflag);
2246 fdrop(fp, td);
2247 return (error);
2248}
2249
2250int
2251sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2252{
2253 struct mq_attr attr, oattr;
2254 int error;
2255
2256 if (uap->attr != NULL) {
2257 error = copyin(uap->attr, &attr, sizeof(attr));
2258 if (error != 0)
2259 return (error);
2260 }
2261 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2262 &oattr);
2263 if (error == 0 && uap->oattr != NULL) {
2264 bzero(oattr.__reserved, sizeof(oattr.__reserved));
2265 error = copyout(&oattr, uap->oattr, sizeof(oattr));
2266 }
2267 return (error);
2268}
2269
2270int
2271sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2272{
2273 struct mqueue *mq;
2274 struct file *fp;
2275 struct timespec *abs_timeout, ets;
2276 int error;
2277 int waitok;
2278
2279 AUDIT_ARG_FD(uap->mqd);
2280 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2281 if (error)
2282 return (error);
2283 if (uap->abs_timeout != NULL) {
2284 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2285 if (error != 0)
2286 goto out;
2287 abs_timeout = &ets;
2288 } else
2289 abs_timeout = NULL;
2290 waitok = !(fp->f_flag & O_NONBLOCK);
2291 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2292 uap->msg_prio, waitok, abs_timeout);
2293out:
2294 fdrop(fp, td);
2295 return (error);
2296}
2297
2298int
2299sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2300{
2301 struct mqueue *mq;
2302 struct file *fp;
2303 struct timespec *abs_timeout, ets;
2304 int error, waitok;
2305
2306 AUDIT_ARG_FD(uap->mqd);
2307 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2308 if (error)
2309 return (error);
2310 if (uap->abs_timeout != NULL) {
2311 error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2312 if (error != 0)
2313 goto out;
2314 abs_timeout = &ets;
2315 } else
2316 abs_timeout = NULL;
2317 waitok = !(fp->f_flag & O_NONBLOCK);
2318 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2319 uap->msg_prio, waitok, abs_timeout);
2320out:
2321 fdrop(fp, td);
2322 return (error);
2323}
2324
2325static int
2326kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
2327{
2328 struct filedesc *fdp;
2329 struct proc *p;
2330 struct mqueue *mq;
2331 struct file *fp, *fp2;
2332 struct mqueue_notifier *nt, *newnt = NULL;
2333 int error;
2334
2335 AUDIT_ARG_FD(mqd);
2336 if (sigev != NULL) {
2337 if (sigev->sigev_notify != SIGEV_SIGNAL &&
2338 sigev->sigev_notify != SIGEV_THREAD_ID &&
2339 sigev->sigev_notify != SIGEV_NONE)
2340 return (EINVAL);
2341 if ((sigev->sigev_notify == SIGEV_SIGNAL ||
2342 sigev->sigev_notify == SIGEV_THREAD_ID) &&
2343 !_SIG_VALID(sigev->sigev_signo))
2344 return (EINVAL);
2345 }
2346 p = td->td_proc;
2347 fdp = td->td_proc->p_fd;
2348 error = getmq(td, mqd, &fp, NULL, &mq);
2349 if (error)
2350 return (error);
2351again:
2352 FILEDESC_SLOCK(fdp);
2353 fp2 = fget_noref(fdp, mqd);
2354 if (fp2 == NULL) {
2355 FILEDESC_SUNLOCK(fdp);
2356 error = EBADF;
2357 goto out;
2358 }
2359#ifdef CAPABILITIES
2360 error = cap_check(cap_rights(fdp, mqd), &cap_event_rights);
2361 if (error) {
2362 FILEDESC_SUNLOCK(fdp);
2363 goto out;
2364 }
2365#endif
2366 if (fp2 != fp) {
2367 FILEDESC_SUNLOCK(fdp);
2368 error = EBADF;
2369 goto out;
2370 }
2371 mtx_lock(&mq->mq_mutex);
2372 FILEDESC_SUNLOCK(fdp);
2373 if (sigev != NULL) {
2374 if (mq->mq_notifier != NULL) {
2375 error = EBUSY;
2376 } else {
2377 PROC_LOCK(p);
2378 nt = notifier_search(p, mqd);
2379 if (nt == NULL) {
2380 if (newnt == NULL) {
2381 PROC_UNLOCK(p);
2382 mtx_unlock(&mq->mq_mutex);
2383 newnt = notifier_alloc();
2384 goto again;
2385 }
2386 }
2387
2388 if (nt != NULL) {
2389 sigqueue_take(&nt->nt_ksi);
2390 if (newnt != NULL) {
2391 notifier_free(newnt);
2392 newnt = NULL;
2393 }
2394 } else {
2395 nt = newnt;
2396 newnt = NULL;
2397 ksiginfo_init(&nt->nt_ksi);
2398 nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2399 nt->nt_ksi.ksi_code = SI_MESGQ;
2400 nt->nt_proc = p;
2401 nt->nt_ksi.ksi_mqd = mqd;
2402 notifier_insert(p, nt);
2403 }
2404 nt->nt_sigev = *sigev;
2405 mq->mq_notifier = nt;
2406 PROC_UNLOCK(p);
2407 /*
2408 * if there is no receivers and message queue
2409 * is not empty, we should send notification
2410 * as soon as possible.
2411 */
2412 if (mq->mq_receivers == 0 &&
2413 !TAILQ_EMPTY(&mq->mq_msgq))
2414 mqueue_send_notification(mq);
2415 }
2416 } else {
2417 notifier_remove(p, mq, mqd);
2418 }
2419 mtx_unlock(&mq->mq_mutex);
2420
2421out:
2422 fdrop(fp, td);
2423 if (newnt != NULL)
2424 notifier_free(newnt);
2425 return (error);
2426}
2427
2428int
2429sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2430{
2431 struct sigevent ev, *evp;
2432 int error;
2433
2434 if (uap->sigev == NULL) {
2435 evp = NULL;
2436 } else {
2437 error = copyin(uap->sigev, &ev, sizeof(ev));
2438 if (error != 0)
2439 return (error);
2440 evp = &ev;
2441 }
2442 return (kern_kmq_notify(td, uap->mqd, evp));
2443}
2444
2445static void
2446mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2447{
2448 struct mqueue *mq;
2449#ifdef INVARIANTS
2450 struct filedesc *fdp;
2451
2452 fdp = td->td_proc->p_fd;
2453 FILEDESC_LOCK_ASSERT(fdp);
2454#endif
2455
2456 if (fp->f_ops == &mqueueops) {
2457 mq = FPTOMQ(fp);
2458 mtx_lock(&mq->mq_mutex);
2459 notifier_remove(td->td_proc, mq, fd);
2460
2461 /* have to wakeup thread in same process */
2462 if (mq->mq_flags & MQ_RSEL) {
2463 mq->mq_flags &= ~MQ_RSEL;
2464 selwakeup(&mq->mq_rsel);
2465 }
2466 if (mq->mq_flags & MQ_WSEL) {
2467 mq->mq_flags &= ~MQ_WSEL;
2468 selwakeup(&mq->mq_wsel);
2469 }
2470 mtx_unlock(&mq->mq_mutex);
2471 }
2472}
2473
2474static void
2475mq_proc_exit(void *arg __unused, struct proc *p)
2476{
2477 struct filedesc *fdp;
2478 struct file *fp;
2479 struct mqueue *mq;
2480 int i;
2481
2482 fdp = p->p_fd;
2483 FILEDESC_SLOCK(fdp);
2484 for (i = 0; i < fdp->fd_nfiles; ++i) {
2485 fp = fget_noref(fdp, i);
2486 if (fp != NULL && fp->f_ops == &mqueueops) {
2487 mq = FPTOMQ(fp);
2488 mtx_lock(&mq->mq_mutex);
2489 notifier_remove(p, FPTOMQ(fp), i);
2490 mtx_unlock(&mq->mq_mutex);
2491 }
2492 }
2493 FILEDESC_SUNLOCK(fdp);
2494 KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2495}
2496
2497static int
2498mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2499 struct thread *td)
2500{
2501 struct mqueue *mq = FPTOMQ(fp);
2502 int revents = 0;
2503
2504 mtx_lock(&mq->mq_mutex);
2505 if (events & (POLLIN | POLLRDNORM)) {
2506 if (mq->mq_curmsgs) {
2507 revents |= events & (POLLIN | POLLRDNORM);
2508 } else {
2509 mq->mq_flags |= MQ_RSEL;
2510 selrecord(td, &mq->mq_rsel);
2511 }
2512 }
2513 if (events & POLLOUT) {
2514 if (mq->mq_curmsgs < mq->mq_maxmsg)
2515 revents |= POLLOUT;
2516 else {
2517 mq->mq_flags |= MQ_WSEL;
2518 selrecord(td, &mq->mq_wsel);
2519 }
2520 }
2521 mtx_unlock(&mq->mq_mutex);
2522 return (revents);
2523}
2524
2525static int
2526mqf_close(struct file *fp, struct thread *td)
2527{
2528 struct mqfs_node *pn;
2529
2530 fp->f_ops = &badfileops;
2531 pn = fp->f_data;
2532 fp->f_data = NULL;
2533 sx_xlock(&mqfs_data.mi_lock);
2534 mqnode_release(pn);
2535 sx_xunlock(&mqfs_data.mi_lock);
2536 return (0);
2537}
2538
2539static int
2540mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred)
2541{
2542 struct mqfs_node *pn = fp->f_data;
2543
2544 bzero(st, sizeof *st);
2545 sx_xlock(&mqfs_data.mi_lock);
2546 st->st_atim = pn->mn_atime;
2547 st->st_mtim = pn->mn_mtime;
2548 st->st_ctim = pn->mn_ctime;
2549 st->st_birthtim = pn->mn_birth;
2550 st->st_uid = pn->mn_uid;
2551 st->st_gid = pn->mn_gid;
2552 st->st_mode = S_IFIFO | pn->mn_mode;
2553 sx_xunlock(&mqfs_data.mi_lock);
2554 return (0);
2555}
2556
2557static int
2558mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2559 struct thread *td)
2560{
2561 struct mqfs_node *pn;
2562 int error;
2563
2564 error = 0;
2565 pn = fp->f_data;
2566 sx_xlock(&mqfs_data.mi_lock);
2567 error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
2568 active_cred);
2569 if (error != 0)
2570 goto out;
2571 pn->mn_mode = mode & ACCESSPERMS;
2572out:
2573 sx_xunlock(&mqfs_data.mi_lock);
2574 return (error);
2575}
2576
2577static int
2578mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2579 struct thread *td)
2580{
2581 struct mqfs_node *pn;
2582 int error;
2583
2584 error = 0;
2585 pn = fp->f_data;
2586 sx_xlock(&mqfs_data.mi_lock);
2587 if (uid == (uid_t)-1)
2588 uid = pn->mn_uid;
2589 if (gid == (gid_t)-1)
2590 gid = pn->mn_gid;
2591 if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
2592 (gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
2593 (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN)))
2594 goto out;
2595 pn->mn_uid = uid;
2596 pn->mn_gid = gid;
2597out:
2598 sx_xunlock(&mqfs_data.mi_lock);
2599 return (error);
2600}
2601
2602static int
2603mqf_kqfilter(struct file *fp, struct knote *kn)
2604{
2605 struct mqueue *mq = FPTOMQ(fp);
2606 int error = 0;
2607
2608 if (kn->kn_filter == EVFILT_READ) {
2609 kn->kn_fop = &mq_rfiltops;
2610 knlist_add(&mq->mq_rsel.si_note, kn, 0);
2611 } else if (kn->kn_filter == EVFILT_WRITE) {
2612 kn->kn_fop = &mq_wfiltops;
2613 knlist_add(&mq->mq_wsel.si_note, kn, 0);
2614 } else
2615 error = EINVAL;
2616 return (error);
2617}
2618
2619static void
2620filt_mqdetach(struct knote *kn)
2621{
2622 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2623
2624 if (kn->kn_filter == EVFILT_READ)
2625 knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2626 else if (kn->kn_filter == EVFILT_WRITE)
2627 knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2628 else
2629 panic("filt_mqdetach");
2630}
2631
2632static int
2633filt_mqread(struct knote *kn, long hint)
2634{
2635 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2636
2637 mtx_assert(&mq->mq_mutex, MA_OWNED);
2638 return (mq->mq_curmsgs != 0);
2639}
2640
2641static int
2642filt_mqwrite(struct knote *kn, long hint)
2643{
2644 struct mqueue *mq = FPTOMQ(kn->kn_fp);
2645
2646 mtx_assert(&mq->mq_mutex, MA_OWNED);
2647 return (mq->mq_curmsgs < mq->mq_maxmsg);
2648}
2649
2650static int
2651mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
2652{
2653
2654 kif->kf_type = KF_TYPE_MQUEUE;
2655 return (0);
2656}
2657
2658static struct fileops mqueueops = {
2659 .fo_read = invfo_rdwr,
2660 .fo_write = invfo_rdwr,
2661 .fo_truncate = invfo_truncate,
2662 .fo_ioctl = invfo_ioctl,
2663 .fo_poll = mqf_poll,
2664 .fo_kqfilter = mqf_kqfilter,
2665 .fo_stat = mqf_stat,
2666 .fo_close = mqf_close,
2667 .fo_chmod = mqf_chmod,
2668 .fo_chown = mqf_chown,
2669 .fo_sendfile = invfo_sendfile,
2670 .fo_fill_kinfo = mqf_fill_kinfo,
2671 .fo_flags = DFLAG_PASSABLE,
2672};
2673
2674static struct vop_vector mqfs_vnodeops = {
2675 .vop_default = &default_vnodeops,
2676 .vop_access = mqfs_access,
2677 .vop_cachedlookup = mqfs_lookup,
2678 .vop_lookup = vfs_cache_lookup,
2679 .vop_reclaim = mqfs_reclaim,
2680 .vop_create = mqfs_create,
2681 .vop_remove = mqfs_remove,
2682 .vop_inactive = mqfs_inactive,
2683 .vop_open = mqfs_open,
2684 .vop_close = mqfs_close,
2685 .vop_getattr = mqfs_getattr,
2686 .vop_setattr = mqfs_setattr,
2687 .vop_read = mqfs_read,
2688 .vop_write = VOP_EOPNOTSUPP,
2689 .vop_readdir = mqfs_readdir,
2690 .vop_mkdir = VOP_EOPNOTSUPP,
2691 .vop_rmdir = VOP_EOPNOTSUPP
2692};
2693VFS_VOP_VECTOR_REGISTER(mqfs_vnodeops);
2694
2695static struct vfsops mqfs_vfsops = {
2696 .vfs_init = mqfs_init,
2697 .vfs_uninit = mqfs_uninit,
2698 .vfs_mount = mqfs_mount,
2699 .vfs_unmount = mqfs_unmount,
2700 .vfs_root = mqfs_root,
2701 .vfs_statfs = mqfs_statfs,
2702};
2703
2704static struct vfsconf mqueuefs_vfsconf = {
2705 .vfc_version = VFS_VERSION,
2706 .vfc_name = "mqueuefs",
2707 .vfc_vfsops = &mqfs_vfsops,
2708 .vfc_typenum = -1,
2709 .vfc_flags = VFCF_SYNTHETIC
2710};
2711
2712static struct syscall_helper_data mq_syscalls[] = {
2713 SYSCALL_INIT_HELPER(kmq_open),
2714 SYSCALL_INIT_HELPER_F(kmq_setattr, SYF_CAPENABLED),
2715 SYSCALL_INIT_HELPER_F(kmq_timedsend, SYF_CAPENABLED),
2716 SYSCALL_INIT_HELPER_F(kmq_timedreceive, SYF_CAPENABLED),
2717 SYSCALL_INIT_HELPER_F(kmq_notify, SYF_CAPENABLED),
2718 SYSCALL_INIT_HELPER(kmq_unlink),
2719 SYSCALL_INIT_LAST
2720};
2721
2722#ifdef COMPAT_FREEBSD32
2723#include <compat/freebsd32/freebsd32.h>
2724#include <compat/freebsd32/freebsd32_proto.h>
2725#include <compat/freebsd32/freebsd32_signal.h>
2726#include <compat/freebsd32/freebsd32_syscall.h>
2727#include <compat/freebsd32/freebsd32_util.h>
2728
2729static void
2730mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2731{
2732
2733 to->mq_flags = from->mq_flags;
2734 to->mq_maxmsg = from->mq_maxmsg;
2735 to->mq_msgsize = from->mq_msgsize;
2736 to->mq_curmsgs = from->mq_curmsgs;
2737}
2738
2739static void
2740mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2741{
2742
2743 to->mq_flags = from->mq_flags;
2744 to->mq_maxmsg = from->mq_maxmsg;
2745 to->mq_msgsize = from->mq_msgsize;
2746 to->mq_curmsgs = from->mq_curmsgs;
2747}
2748
2749int
2750freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
2751{
2752 struct mq_attr attr;
2753 struct mq_attr32 attr32;
2754 int flags, error;
2755
2756 if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
2757 return (EINVAL);
2758 flags = FFLAGS(uap->flags);
2759 if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2760 error = copyin(uap->attr, &attr32, sizeof(attr32));
2761 if (error)
2762 return (error);
2763 mq_attr_from32(&attr32, &attr);
2764 }
2765 return (kern_kmq_open(td, uap->path, flags, uap->mode,
2766 uap->attr != NULL ? &attr : NULL));
2767}
2768
2769int
2770freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
2771{
2772 struct mq_attr attr, oattr;
2773 struct mq_attr32 attr32, oattr32;
2774 int error;
2775
2776 if (uap->attr != NULL) {
2777 error = copyin(uap->attr, &attr32, sizeof(attr32));
2778 if (error != 0)
2779 return (error);
2780 mq_attr_from32(&attr32, &attr);
2781 }
2782 error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2783 &oattr);
2784 if (error == 0 && uap->oattr != NULL) {
2785 mq_attr_to32(&oattr, &oattr32);
2786 bzero(oattr32.__reserved, sizeof(oattr32.__reserved));
2787 error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2788 }
2789 return (error);
2790}
2791
2792int
2793freebsd32_kmq_timedsend(struct thread *td,
2794 struct freebsd32_kmq_timedsend_args *uap)
2795{
2796 struct mqueue *mq;
2797 struct file *fp;
2798 struct timespec32 ets32;
2799 struct timespec *abs_timeout, ets;
2800 int error;
2801 int waitok;
2802
2803 AUDIT_ARG_FD(uap->mqd);
2804 error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2805 if (error)
2806 return (error);
2807 if (uap->abs_timeout != NULL) {
2808 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2809 if (error != 0)
2810 goto out;
2811 CP(ets32, ets, tv_sec);
2812 CP(ets32, ets, tv_nsec);
2813 abs_timeout = &ets;
2814 } else
2815 abs_timeout = NULL;
2816 waitok = !(fp->f_flag & O_NONBLOCK);
2817 error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2818 uap->msg_prio, waitok, abs_timeout);
2819out:
2820 fdrop(fp, td);
2821 return (error);
2822}
2823
2824int
2825freebsd32_kmq_timedreceive(struct thread *td,
2826 struct freebsd32_kmq_timedreceive_args *uap)
2827{
2828 struct mqueue *mq;
2829 struct file *fp;
2830 struct timespec32 ets32;
2831 struct timespec *abs_timeout, ets;
2832 int error, waitok;
2833
2834 AUDIT_ARG_FD(uap->mqd);
2835 error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2836 if (error)
2837 return (error);
2838 if (uap->abs_timeout != NULL) {
2839 error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2840 if (error != 0)
2841 goto out;
2842 CP(ets32, ets, tv_sec);
2843 CP(ets32, ets, tv_nsec);
2844 abs_timeout = &ets;
2845 } else
2846 abs_timeout = NULL;
2847 waitok = !(fp->f_flag & O_NONBLOCK);
2848 error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2849 uap->msg_prio, waitok, abs_timeout);
2850out:
2851 fdrop(fp, td);
2852 return (error);
2853}
2854
2855int
2856freebsd32_kmq_notify(struct thread *td, struct freebsd32_kmq_notify_args *uap)
2857{
2858 struct sigevent ev, *evp;
2859 struct sigevent32 ev32;
2860 int error;
2861
2862 if (uap->sigev == NULL) {
2863 evp = NULL;
2864 } else {
2865 error = copyin(uap->sigev, &ev32, sizeof(ev32));
2866 if (error != 0)
2867 return (error);
2868 error = convert_sigevent32(&ev32, &ev);
2869 if (error != 0)
2870 return (error);
2871 evp = &ev;
2872 }
2873 return (kern_kmq_notify(td, uap->mqd, evp));
2874}
2875
2876static struct syscall_helper_data mq32_syscalls[] = {
2877 SYSCALL32_INIT_HELPER(freebsd32_kmq_open),
2878 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_setattr, SYF_CAPENABLED),
2879 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_timedsend, SYF_CAPENABLED),
2880 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_timedreceive, SYF_CAPENABLED),
2881 SYSCALL32_INIT_HELPER_F(freebsd32_kmq_notify, SYF_CAPENABLED),
2882 SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink),
2883 SYSCALL_INIT_LAST
2884};
2885#endif
2886
2887static int
2888mqinit(void)
2889{
2890 int error;
2891
2892 error = syscall_helper_register(mq_syscalls, SY_THR_STATIC_KLD);
2893 if (error != 0)
2894 return (error);
2895#ifdef COMPAT_FREEBSD32
2896 error = syscall32_helper_register(mq32_syscalls, SY_THR_STATIC_KLD);
2897 if (error != 0)
2898 return (error);
2899#endif
2900 return (0);
2901}
2902
2903static int
2904mqunload(void)
2905{
2906
2907#ifdef COMPAT_FREEBSD32
2908 syscall32_helper_unregister(mq32_syscalls);
2909#endif
2910 syscall_helper_unregister(mq_syscalls);
2911 return (0);
2912}
2913
2914static int
2915mq_modload(struct module *module, int cmd, void *arg)
2916{
2917 int error = 0;
2918
2919 error = vfs_modevent(module, cmd, arg);
2920 if (error != 0)
2921 return (error);
2922
2923 switch (cmd) {
2924 case MOD_LOAD:
2925 error = mqinit();
2926 if (error != 0)
2927 mqunload();
2928 break;
2929 case MOD_UNLOAD:
2930 error = mqunload();
2931 break;
2932 default:
2933 break;
2934 }
2935 return (error);
2936}
2937
2938static moduledata_t mqueuefs_mod = {
2939 "mqueuefs",
2940 mq_modload,
2941 &mqueuefs_vfsconf
2942};
2943DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
2944MODULE_VERSION(mqueuefs, 1);
ts
struct timespec * ts
Definition: clock_if.m:39
parent
device_t parent
Definition: device_if.m:187
name
const char * name
Definition: kern_fail.c:145
LIST_HEAD
static LIST_HEAD(alq)
Definition: kern_alq.c:99
st
static struct bt_table st
Definition: kern_boottrace.c:86
tvtohz
int tvtohz(struct timeval *tv)
Definition: kern_clock.c:529
invfo_ioctl
int invfo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred, struct thread *td)
Definition: kern_descrip.c:5100
invfo_truncate
int invfo_truncate(struct file *fp, off_t length, struct ucred *active_cred, struct thread *td)
Definition: kern_descrip.c:5092
mq_fdclose
void __read_mostly(* mq_fdclose)(struct thread *td, int fd, struct file *fp)
Definition: kern_descrip.c:201
fget_write
int fget_write(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
Definition: kern_descrip.c:3402
fdclose
void fdclose(struct thread *td, struct file *fp, int idx)
Definition: kern_descrip.c:2671
fget
int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
Definition: kern_descrip.c:3344
badfileops
struct fileops badfileops
Definition: kern_descrip.c:5036
finit
void finit(struct file *fp, u_int flag, short type, void *data, struct fileops *ops)
Definition: kern_descrip.c:2844
fget_read
int fget_read(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp)
Definition: kern_descrip.c:3395
invfo_sendfile
int invfo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio, struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags, struct thread *td)
Definition: kern_descrip.c:5139
invfo_rdwr
int invfo_rdwr(struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td)
Definition: kern_descrip.c:5084
knlist_remove
void knlist_remove(struct knlist *knl, struct knote *kn, int islocked)
Definition: kern_event.c:2467
knlist_add
void knlist_add(struct knlist *knl, struct knote *kn, int islocked)
Definition: kern_event.c:2420
knlist_destroy
void knlist_destroy(struct knlist *knl)
Definition: kern_event.c:2589
knote
void knote(struct knlist *list, long hint, int lockflags)
Definition: kern_event.c:2363
knlist_init_mtx
void knlist_init_mtx(struct knlist *knl, struct mtx *lock)
Definition: kern_event.c:2564
allprison
struct prisonlist allprison
Definition: kern_jail.c:136
malloc
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
Definition: kern_malloc.c:632
free
void free(void *addr, struct malloc_type *mtp)
Definition: kern_malloc.c:907
pr
static struct pollrec pr[POLL_LIST_LEN]
Definition: kern_poll.c:261
priv_check_cred
int priv_check_cred(struct ucred *cred, int priv)
Definition: kern_priv.c:151
priv_check
int priv_check(struct thread *td, int priv)
Definition: kern_priv.c:271
groupmember
int groupmember(gid_t gid, struct ucred *cred)
Definition: kern_prot.c:1272
panic
void panic(const char *fmt,...)
Definition: kern_shutdown.c:884
sigqueue_take
void sigqueue_take(ksiginfo_t *ksi)
Definition: kern_sig.c:380
tdsendsignal
int tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
Definition: kern_sig.c:2183
sigev_findtd
int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **ttd)
Definition: kern_sig.c:2136
sx_destroy
void sx_destroy(struct sx *sx)
Definition: kern_sx.c:266
wakeup_one
void wakeup_one(const void *ident)
Definition: kern_synch.c:369
syscall_helper_unregister
int syscall_helper_unregister(struct syscall_helper_data *sd)
Definition: kern_syscalls.c:247
syscall_helper_register
int syscall_helper_register(struct syscall_helper_data *sd, int flags)
Definition: kern_syscalls.c:221
getnanotime
void getnanotime(struct timespec *tsp)
Definition: kern_tc.c:472
data
uint32_t * data
Definition: msi_if.m:90
p31b_setcfg
void p31b_setcfg(int num, int value)
Definition: posix4_mib.c:129
mqfs_info
Definition: uipc_mqueue.c:122
mqfs_info::mi_lock
struct sx mi_lock
Definition: uipc_mqueue.c:123
mqfs_info::mi_root
struct mqfs_node * mi_root
Definition: uipc_mqueue.c:124
mqfs_info::mi_unrhdr
struct unrhdr * mi_unrhdr
Definition: uipc_mqueue.c:125
mqfs_node
Definition: uipc_mqueue.c:138
mqfs_node::mn_name
char mn_name[MQFS_NAMELEN+1]
Definition: uipc_mqueue.c:139
mqfs_node::mn_parent
struct mqfs_node * mn_parent
Definition: uipc_mqueue.c:141
mqfs_node::mn_info
struct mqfs_info * mn_info
Definition: uipc_mqueue.c:140
mqfs_vdata
Definition: uipc_mqueue.c:128
mqueue_msg
Definition: uipc_mqueue.c:195
mqueue_notifier
Definition: uipc_mqueue.c:170
mqueue::mq_msgq
struct msgq mq_msgq
Definition: uipc_mqueue.c:184
mqueue::mq_wsel
struct selinfo mq_wsel
Definition: uipc_mqueue.c:188
mqueue::mq_maxmsg
long mq_maxmsg
Definition: uipc_mqueue.c:180
mqueue::mq_mutex
struct mtx mq_mutex
Definition: uipc_mqueue.c:178
mqueue::mq_senders
int mq_senders
Definition: uipc_mqueue.c:186
mqueue::mq_notifier
struct mqueue_notifier * mq_notifier
Definition: uipc_mqueue.c:189
mqueue::mq_flags
int mq_flags
Definition: uipc_mqueue.c:179
mqueue::mq_receivers
int mq_receivers
Definition: uipc_mqueue.c:185
mqueue::mq_totalbytes
long mq_totalbytes
Definition: uipc_mqueue.c:183
mqueue::mq_msgsize
long mq_msgsize
Definition: uipc_mqueue.c:181
mqueue::mq_curmsgs
long mq_curmsgs
Definition: uipc_mqueue.c:182
mqueue::mq_rsel
struct selinfo mq_rsel
Definition: uipc_mqueue.c:187
accmode
accmode_t accmode
Definition: subr_acl_nfs4.c:69
ev
const char * ev
Definition: subr_boot.c:64
cap_event_rights
__read_mostly cap_rights_t cap_event_rights
Definition: subr_capability.c:59
cap_write_rights
__read_mostly cap_rights_t cap_write_rights
Definition: subr_capability.c:99
cap_read_rights
__read_mostly cap_rights_t cap_read_rights
Definition: subr_capability.c:88
snprintf
int snprintf(char *str, size_t size, const char *format,...)
Definition: subr_prf.c:550
flags
uint16_t flags
Definition: subr_stats.c:2
taskqueue_enqueue
int taskqueue_enqueue(struct taskqueue *queue, struct task *task)
Definition: subr_taskqueue.c:277
uiomove_frombuf
int uiomove_frombuf(void *buf, int buflen, struct uio *uio)
Definition: subr_uio.c:290
alloc_unr
int alloc_unr(struct unrhdr *uh)
Definition: subr_unit.c:650
delete_unrhdr
void delete_unrhdr(struct unrhdr *uh)
Definition: subr_unit.c:370
new_unrhdr
struct unrhdr * new_unrhdr(int low, int high, struct mtx *mutex)
Definition: subr_unit.c:360
free_unr
void free_unr(struct unrhdr *uh, u_int item)
Definition: subr_unit.c:900
seldrain
void seldrain(struct selinfo *sip)
Definition: sys_generic.c:1851
selrecord
void selrecord(struct thread *selector, struct selinfo *sip)
Definition: sys_generic.c:1869
selwakeup
void selwakeup(struct selinfo *sip)
Definition: sys_generic.c:1917
mtx
struct mtx mtx
Definition: uipc_ktls.c:0
sys_kmq_timedreceive
int sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
Definition: uipc_mqueue.c:2271
do_unlink
static int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
Definition: uipc_mqueue.c:1026
mqfs_open
static int mqfs_open(struct vop_open_args *ap)
Definition: uipc_mqueue.c:1136
mqnode_addref
static __inline void mqnode_addref(struct mqfs_node *node)
Definition: uipc_mqueue.c:394
mqfs_destroy
static int mqfs_destroy(struct mqfs_node *mn)
Definition: uipc_mqueue.c:558
notifier_delete
static __inline void notifier_delete(struct proc *p, struct mqueue_notifier *nt)
Definition: uipc_mqueue.c:1986
mq_rfiltops
struct filterops mq_rfiltops
Definition: uipc_mqueue.c:279
getmq_read
static __inline int getmq_read(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
Definition: uipc_mqueue.c:2202
notifier_free
static __inline void notifier_free(struct mqueue_notifier *p)
Definition: uipc_mqueue.c:1962
sys_kmq_unlink
int sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
Definition: uipc_mqueue.c:2138
mqf_fill_kinfo
static int mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
Definition: uipc_mqueue.c:2651
VFSTOMQFS
#define VFSTOMQFS(m)
Definition: uipc_mqueue.c:162
MQ_RSEL
#define MQ_RSEL
Definition: uipc_mqueue.c:192
mqnode_zone
static uma_zone_t mqnode_zone
Definition: uipc_mqueue.c:227
mq_syscalls
static struct syscall_helper_data mq_syscalls[]
Definition: uipc_mqueue.c:2712
mqnode_free
static __inline void mqnode_free(struct mqfs_node *node)
Definition: uipc_mqueue.c:388
mq_proc_exit
static void mq_proc_exit(void *arg, struct proc *p)
mqfs_init
static int mqfs_init(struct vfsconf *vfc)
Definition: uipc_mqueue.c:657
mqinit
static int mqinit(void)
Definition: uipc_mqueue.c:2888
mqfs_vnodeops
static struct vop_vector mqfs_vnodeops
Definition: uipc_mqueue.c:231
mqfs_vfsops
static struct vfsops mqfs_vfsops
Definition: uipc_mqueue.c:2695
mqf_poll
static int mqf_poll(struct file *fp, int events, struct ucred *active_cred, struct thread *td)
Definition: uipc_mqueue.c:2498
VFS_VOP_VECTOR_REGISTER
VFS_VOP_VECTOR_REGISTER(mqfs_vnodeops)
_getmq
static int _getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func, struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
Definition: uipc_mqueue.c:2171
maxmsgsize
static int maxmsgsize
Definition: uipc_mqueue.c:211
mqfs_getattr
static int mqfs_getattr(struct vop_getattr_args *ap)
Definition: uipc_mqueue.c:1198
mqueue_freemsg
static __inline void mqueue_freemsg(struct mqueue_msg *msg)
Definition: uipc_mqueue.c:1681
mqfs_type_t
mqfs_type_t
Definition: uipc_mqueue.c:107
mqfstype_parent
@ mqfstype_parent
Definition: uipc_mqueue.c:112
mqfstype_none
@ mqfstype_none
Definition: uipc_mqueue.c:108
mqfstype_symlink
@ mqfstype_symlink
Definition: uipc_mqueue.c:114
mqfstype_this
@ mqfstype_this
Definition: uipc_mqueue.c:111
mqfstype_file
@ mqfstype_file
Definition: uipc_mqueue.c:113
mqfstype_root
@ mqfstype_root
Definition: uipc_mqueue.c:109
mqfstype_dir
@ mqfstype_dir
Definition: uipc_mqueue.c:110
filt_mqread
static int filt_mqread(struct knote *kn, long hint)
Definition: uipc_mqueue.c:2633
mqfs_fileno_uninit
static void mqfs_fileno_uninit(struct mqfs_info *mi)
Definition: uipc_mqueue.c:306
mqfs_search
static struct mqfs_node * mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred)
Definition: uipc_mqueue.c:824
mqfs_create_node
static struct mqfs_node * mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode, int nodetype)
Definition: uipc_mqueue.c:445
mqueue_send_notification
static void mqueue_send_notification(struct mqueue *mq)
Definition: uipc_mqueue.c:1816
mqfs_readdir
static int mqfs_readdir(struct vop_readdir_args *ap)
Definition: uipc_mqueue.c:1380
notifier_alloc
static __inline struct mqueue_notifier * notifier_alloc(void)
Definition: uipc_mqueue.c:1956
mqfs_close
static int mqfs_close(struct vop_close_args *ap)
Definition: uipc_mqueue.c:1152
DECLARE_MODULE
DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
maxmsg
static int maxmsg
Definition: uipc_mqueue.c:208
mqueue_savemsg
static int mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
Definition: uipc_mqueue.c:1666
_mqueue_send
static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
Definition: uipc_mqueue.c:1760
getmq_write
static __inline int getmq_write(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
Definition: uipc_mqueue.c:2211
VTOMQ
#define VTOMQ(vp)
Definition: uipc_mqueue.c:161
kern_kmq_notify
static int kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
Definition: uipc_mqueue.c:2326
mqf_kqfilter
static int mqf_kqfilter(struct file *fp, struct knote *kn)
Definition: uipc_mqueue.c:2603
mqfs_reclaim
static int mqfs_reclaim(struct vop_reclaim_args *ap)
Definition: uipc_mqueue.c:1106
mvdata_zone
static uma_zone_t mvdata_zone
Definition: uipc_mqueue.c:229
sys_kmq_setattr
int sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
Definition: uipc_mqueue.c:2251
mqfs_fixup_dir
static int mqfs_fixup_dir(struct mqfs_node *parent)
Definition: uipc_mqueue.c:485
mqfs_mount
static int mqfs_mount(struct mount *mp)
Definition: uipc_mqueue.c:591
exit_tag
static eventhandler_tag exit_tag
Definition: uipc_mqueue.c:223
mqfs_osd_jail_slot
static unsigned mqfs_osd_jail_slot
Definition: uipc_mqueue.c:233
mqunload
static int mqunload(void)
Definition: uipc_mqueue.c:2904
kern_kmq_setattr
static int kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr, struct mq_attr *oattr)
Definition: uipc_mqueue.c:2220
TAILQ_HEAD
TAILQ_HEAD(msgq, mqueue_msg)
mqfs_create_file
static struct mqfs_node * mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen, struct ucred *cred, int mode)
Definition: uipc_mqueue.c:468
unloadable
static int unloadable
Definition: uipc_mqueue.c:220
mqnode_release
static __inline void mqnode_release(struct mqfs_node *node)
Definition: uipc_mqueue.c:400
FPTOMQ
#define FPTOMQ(fp)
Definition: uipc_mqueue.c:163
mq_wfiltops
struct filterops mq_wfiltops
Definition: uipc_mqueue.c:284
filt_mqdetach
static void filt_mqdetach(struct knote *kn)
Definition: uipc_mqueue.c:2620
mqfs_unmount
static int mqfs_unmount(struct mount *mp, int mntflags)
Definition: uipc_mqueue.c:620
mqfs_inactive
static int mqfs_inactive(struct vop_inactive_args *ap)
Definition: uipc_mqueue.c:1089
mqfs_uninit
static int mqfs_uninit(struct vfsconf *vfc)
Definition: uipc_mqueue.c:698
mq_modload
static int mq_modload(struct module *module, int cmd, void *arg)
Definition: uipc_mqueue.c:2915
maxmq
static int maxmq
Definition: uipc_mqueue.c:214
mqfs_prison_remove
static int mqfs_prison_remove(void *obj, void *data)
sys_kmq_timedsend
int sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
Definition: uipc_mqueue.c:2299
__FBSDID
__FBSDID("$FreeBSD$")
mqfs_add_node
static int mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
Definition: uipc_mqueue.c:426
mqfs_statfs
static int mqfs_statfs(struct mount *mp, struct statfs *sbp)
Definition: uipc_mqueue.c:647
mqf_close
static int mqf_close(struct file *fp, struct thread *td)
Definition: uipc_mqueue.c:2526
mqnoti_zone
static uma_zone_t mqnoti_zone
Definition: uipc_mqueue.c:230
mqueuefs_mod
static moduledata_t mqueuefs_mod
Definition: uipc_mqueue.c:2938
_mqueue_recv
static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
Definition: uipc_mqueue.c:1917
mqueue_send
static int mqueue_send(struct mqueue *mq, const char *msg_ptr, size_t msg_len, unsigned msg_prio, int waitok, const struct timespec *abs_timeout)
Definition: uipc_mqueue.c:1692
default_maxmsg
static int default_maxmsg
Definition: uipc_mqueue.c:205
mqfs_fileno_free
static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
Definition: uipc_mqueue.c:360
mqueue_loadmsg
static struct mqueue_msg * mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
Definition: uipc_mqueue.c:1642
mqnode_alloc
static __inline struct mqfs_node * mqnode_alloc(void)
Definition: uipc_mqueue.c:382
mqfs_allocv
static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
Definition: uipc_mqueue.c:736
kern_kmq_open
static int kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode, const struct mq_attr *attr)
Definition: uipc_mqueue.c:2010
SYSCTL_NODE
static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW|CTLFLAG_MPSAFE, 0, "POSIX real time message queue")
sys_kmq_notify
int sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
Definition: uipc_mqueue.c:2429
mqfs_fileno_init
static void mqfs_fileno_init(struct mqfs_info *mi)
Definition: uipc_mqueue.c:294
_fgetf
int(* _fgetf)(struct thread *, int, cap_rights_t *, struct file **)
Definition: uipc_mqueue.c:2165
mqf_chown
static int mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, struct thread *td)
Definition: uipc_mqueue.c:2578
mqfs_lookup
static int mqfs_lookup(struct vop_cachedlookup_args *ap)
Definition: uipc_mqueue.c:963
default_msgsize
static int default_msgsize
Definition: uipc_mqueue.c:206
SYSCTL_INT
SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW, &maxmsg, 0, "Default maximum messages in queue")
mqueueops
static struct fileops mqueueops
Definition: uipc_mqueue.c:232
VTON
#define VTON(vp)
Definition: uipc_mqueue.c:160
mqfs_lookupx
static int mqfs_lookupx(struct vop_cachedlookup_args *ap)
Definition: uipc_mqueue.c:845
mqueue_fdclose
static void mqueue_fdclose(struct thread *td, int fd, struct file *fp)
Definition: uipc_mqueue.c:2446
mqf_stat
static int mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred)
Definition: uipc_mqueue.c:2540
mqfs_read
static int mqfs_read(struct vop_read_args *ap)
Definition: uipc_mqueue.c:1340
mqfs_setattr
static int mqfs_setattr(struct vop_setattr_args *ap)
Definition: uipc_mqueue.c:1239
notifier_insert
static __inline void notifier_insert(struct proc *p, struct mqueue_notifier *nt)
Definition: uipc_mqueue.c:1980
mqfs_data
static struct mqfs_info mqfs_data
Definition: uipc_mqueue.c:226
do_recycle
static void do_recycle(void *context, int pending __unused)
Definition: uipc_mqueue.c:722
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static void notifier_remove(struct proc *p, struct mqueue *mq, int fd)
Definition: uipc_mqueue.c:1993
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static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
Definition: uipc_mqueue.c:319
MQ_WSEL
#define MQ_WSEL
Definition: uipc_mqueue.c:193
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static struct vfsconf mqueuefs_vfsconf
Definition: uipc_mqueue.c:2704
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static int curmq
Definition: uipc_mqueue.c:217
FEATURE
FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support")
MQFS_NAMELEN
#define MQFS_NAMELEN
Definition: uipc_mqueue.c:103
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static uma_zone_t mqueue_zone
Definition: uipc_mqueue.c:228
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static struct mqueue_notifier * notifier_search(struct proc *p, int fd)
Definition: uipc_mqueue.c:1968
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static int mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
Definition: uipc_mqueue.c:633
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static struct mqueue * mqueue_alloc(const struct mq_attr *attr)
Definition: uipc_mqueue.c:1594
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static int mqfs_create(struct vop_create_args *ap)
Definition: uipc_mqueue.c:984
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static int mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, struct thread *td)
Definition: uipc_mqueue.c:2558
MALLOC_DEFINE
static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data")
mqfs_remove
static int mqfs_remove(struct vop_remove_args *ap)
Definition: uipc_mqueue.c:1066
filt_mqwrite
static int filt_mqwrite(struct knote *kn, long hint)
Definition: uipc_mqueue.c:2642
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static __inline int getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
Definition: uipc_mqueue.c:2193
mqfs_access
static int mqfs_access(struct vop_access_args *ap)
Definition: uipc_mqueue.c:1171
mqueue_receive
static int mqueue_receive(struct mqueue *mq, char *msg_ptr, size_t msg_len, unsigned *msg_prio, int waitok, const struct timespec *abs_timeout)
Definition: uipc_mqueue.c:1847
mqueue_free
static void mqueue_free(struct mqueue *mq)
Definition: uipc_mqueue.c:1620
sys_kmq_open
int sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
Definition: uipc_mqueue.c:2117
MODULE_VERSION
MODULE_VERSION(mqueuefs, 1)
vfs_cache_lookup
int vfs_cache_lookup(struct vop_lookup_args *ap)
Definition: vfs_cache.c:3045
cache_purge
void cache_purge(struct vnode *vp)
Definition: vfs_cache.c:2872
default_vnodeops
struct vop_vector default_vnodeops
Definition: vfs_default.c:109
path
const char * path
Definition: vfs_extattr.c:715
vfsconf
struct vfsconfhead vfsconf
Definition: vfs_init.c:70
vfs_modevent
int vfs_modevent(module_t mod, int type, void *data)
Definition: vfs_init.c:572
vfs_mountedfrom
void vfs_mountedfrom(struct mount *mp, const char *from)
Definition: vfs_mount.c:2633
vhold
void vhold(struct vnode *vp)
Definition: vfs_subr.c:3376
getnewvnode
int getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops, struct vnode **vpp)
Definition: vfs_subr.c:1770
vrecycle
int vrecycle(struct vnode *vp)
Definition: vfs_subr.c:3900
insmntque
int insmntque(struct vnode *vp, struct mount *mp)
Definition: vfs_subr.c:2018
vflush
int vflush(struct mount *mp, int rootrefs, int flags, struct thread *td)
Definition: vfs_subr.c:3779
vfs_read_dirent
int vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off)
Definition: vfs_subr.c:6459
vaccess
int vaccess(enum vtype type, mode_t file_mode, uid_t file_uid, gid_t file_gid, accmode_t accmode, struct ucred *cred)
Definition: vfs_subr.c:5284
vgone
void vgone(struct vnode *vp)
Definition: vfs_subr.c:3934
vfs_timestamp
void vfs_timestamp(struct timespec *tsp)
Definition: vfs_subr.c:1058
vput
void vput(struct vnode *vp)
Definition: vfs_subr.c:3348
vfs_getnewfsid
void vfs_getnewfsid(struct mount *mp)
Definition: vfs_subr.c:1013
vdrop
void vdrop(struct vnode *vp)
Definition: vfs_subr.c:3619
vget
int vget(struct vnode *vp, int flags)
Definition: vfs_subr.c:3002
buf
struct stat * buf
Definition: vfs_syscalls.c:2423
fd
int fd
Definition: vfs_syscalls.c:2421
mode
mode_t mode
Definition: vfs_syscalls.c:2910
flag
int flag
Definition: vfs_syscalls.c:2116