FreeBSD kernel kern code
uipc_mqueue.c
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1 /*-
2  * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27 
28 /*
29  * POSIX message queue implementation.
30  *
31  * 1) A mqueue filesystem can be mounted, each message queue appears
32  * in mounted directory, user can change queue's permission and
33  * ownership, or remove a queue. Manually creating a file in the
34  * directory causes a message queue to be created in the kernel with
35  * default message queue attributes applied and same name used, this
36  * method is not advocated since mq_open syscall allows user to specify
37  * different attributes. Also the file system can be mounted multiple
38  * times at different mount points but shows same contents.
39  *
40  * 2) Standard POSIX message queue API. The syscalls do not use vfs layer,
41  * but directly operate on internal data structure, this allows user to
42  * use the IPC facility without having to mount mqueue file system.
43  */
44 
45 #include <sys/cdefs.h>
46 __FBSDID("$BSDSUniX$");
47 
48 #include "opt_compat.h"
49 
50 #include <sys/param.h>
51 #include <sys/kernel.h>
52 #include <sys/systm.h>
53 #include <sys/limits.h>
54 #include <sys/buf.h>
55 #include <sys/capability.h>
56 #include <sys/dirent.h>
57 #include <sys/event.h>
58 #include <sys/eventhandler.h>
59 #include <sys/fcntl.h>
60 #include <sys/file.h>
61 #include <sys/filedesc.h>
62 #include <sys/lock.h>
63 #include <sys/malloc.h>
64 #include <sys/module.h>
65 #include <sys/mount.h>
66 #include <sys/mqueue.h>
67 #include <sys/mutex.h>
68 #include <sys/namei.h>
69 #include <sys/posix4.h>
70 #include <sys/poll.h>
71 #include <sys/priv.h>
72 #include <sys/proc.h>
73 #include <sys/queue.h>
74 #include <sys/sysproto.h>
75 #include <sys/stat.h>
76 #include <sys/syscall.h>
77 #include <sys/syscallsubr.h>
78 #include <sys/sysent.h>
79 #include <sys/sx.h>
80 #include <sys/sysctl.h>
81 #include <sys/taskqueue.h>
82 #include <sys/unistd.h>
83 #include <sys/vnode.h>
84 #include <machine/atomic.h>
85 
86 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
87 
88 /*
89  * Limits and constants
90  */
91 #define MQFS_NAMELEN NAME_MAX
92 #define MQFS_DELEN (8 + MQFS_NAMELEN)
93 
94 /* node types */
95 typedef enum {
96  mqfstype_none = 0,
97  mqfstype_root,
98  mqfstype_dir,
99  mqfstype_this,
100  mqfstype_parent,
101  mqfstype_file,
102  mqfstype_symlink,
103 } mqfs_type_t;
104 
105 struct mqfs_node;
106 
107 /*
108  * mqfs_info: describes a mqfs instance
109  */
110 struct mqfs_info {
111  struct sx mi_lock;
112  struct mqfs_node *mi_root;
113  struct unrhdr *mi_unrhdr;
114 };
115 
116 struct mqfs_vdata {
117  LIST_ENTRY(mqfs_vdata) mv_link;
118  struct mqfs_node *mv_node;
119  struct vnode *mv_vnode;
120  struct task mv_task;
121 };
122 
123 /*
124  * mqfs_node: describes a node (file or directory) within a mqfs
125  */
126 struct mqfs_node {
127  char mn_name[MQFS_NAMELEN+1];
128  struct mqfs_info *mn_info;
129  struct mqfs_node *mn_parent;
130  LIST_HEAD(,mqfs_node) mn_children;
131  LIST_ENTRY(mqfs_node) mn_sibling;
132  LIST_HEAD(,mqfs_vdata) mn_vnodes;
133  int mn_refcount;
134  mqfs_type_t mn_type;
135  int mn_deleted;
136  uint32_t mn_fileno;
137  void *mn_data;
138  struct timespec mn_birth;
139  struct timespec mn_ctime;
140  struct timespec mn_atime;
141  struct timespec mn_mtime;
142  uid_t mn_uid;
143  gid_t mn_gid;
144  int mn_mode;
145 };
146 
147 #define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
148 #define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
149 #define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
150 #define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
151  (fp)->f_data)->mn_data))
152 
153 TAILQ_HEAD(msgq, mqueue_msg);
154 
155 struct mqueue;
156 
157 struct mqueue_notifier {
158  LIST_ENTRY(mqueue_notifier) nt_link;
159  struct sigevent nt_sigev;
160  ksiginfo_t nt_ksi;
161  struct proc *nt_proc;
162 };
163 
164 struct mqueue {
165  struct mtx mq_mutex;
166  int mq_flags;
167  long mq_maxmsg;
168  long mq_msgsize;
169  long mq_curmsgs;
170  long mq_totalbytes;
171  struct msgq mq_msgq;
172  int mq_receivers;
173  int mq_senders;
174  struct selinfo mq_rsel;
175  struct selinfo mq_wsel;
176  struct mqueue_notifier *mq_notifier;
177 };
178 
179 #define MQ_RSEL 0x01
180 #define MQ_WSEL 0x02
181 
182 struct mqueue_msg {
183  TAILQ_ENTRY(mqueue_msg) msg_link;
184  unsigned int msg_prio;
185  unsigned int msg_size;
186  /* following real data... */
187 };
188 
189 static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
190  "POSIX real time message queue");
191 
192 static int default_maxmsg = 10;
193 static int default_msgsize = 1024;
194 
195 static int maxmsg = 100;
196 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
197  &maxmsg, 0, "Default maximum messages in queue");
198 static int maxmsgsize = 16384;
199 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
200  &maxmsgsize, 0, "Default maximum message size");
201 static int maxmq = 100;
202 SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
203  &maxmq, 0, "maximum message queues");
204 static int curmq = 0;
205 SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
206  &curmq, 0, "current message queue number");
207 static int unloadable = 0;
208 static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
209 
210 static eventhandler_tag exit_tag;
211 
212 /* Only one instance per-system */
213 static struct mqfs_info mqfs_data;
214 static uma_zone_t mqnode_zone;
215 static uma_zone_t mqueue_zone;
216 static uma_zone_t mvdata_zone;
217 static uma_zone_t mqnoti_zone;
218 static struct vop_vector mqfs_vnodeops;
219 static struct fileops mqueueops;
220 
221 /*
222  * Directory structure construction and manipulation
223  */
224 #ifdef notyet
225 static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
226  const char *name, int namelen, struct ucred *cred, int mode);
227 static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
228  const char *name, int namelen, struct ucred *cred, int mode);
229 #endif
230 
231 static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
232  const char *name, int namelen, struct ucred *cred, int mode);
233 static int mqfs_destroy(struct mqfs_node *mn);
234 static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
235 static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
236 static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
237 
238 /*
239  * Message queue construction and maniplation
240  */
241 static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
242 static void mqueue_free(struct mqueue *mq);
243 static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
244  size_t msg_len, unsigned msg_prio, int waitok,
245  const struct timespec *abs_timeout);
246 static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
247  size_t msg_len, unsigned *msg_prio, int waitok,
248  const struct timespec *abs_timeout);
249 static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
250  int timo);
251 static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
252  int timo);
253 static void mqueue_send_notification(struct mqueue *mq);
254 static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
255 static void mq_proc_exit(void *arg, struct proc *p);
256 
257 /*
258  * kqueue filters
259  */
260 static void filt_mqdetach(struct knote *kn);
261 static int filt_mqread(struct knote *kn, long hint);
262 static int filt_mqwrite(struct knote *kn, long hint);
263 
264 struct filterops mq_rfiltops = {
265  .f_isfd = 1,
266  .f_detach = filt_mqdetach,
267  .f_event = filt_mqread,
268 };
269 struct filterops mq_wfiltops = {
270  .f_isfd = 1,
271  .f_detach = filt_mqdetach,
272  .f_event = filt_mqwrite,
273 };
274 
275 /*
276  * Initialize fileno bitmap
277  */
278 static void
279 mqfs_fileno_init(struct mqfs_info *mi)
280 {
281  struct unrhdr *up;
282 
283  up = new_unrhdr(1, INT_MAX, NULL);
284  mi->mi_unrhdr = up;
285 }
286 
287 /*
288  * Tear down fileno bitmap
289  */
290 static void
291 mqfs_fileno_uninit(struct mqfs_info *mi)
292 {
293  struct unrhdr *up;
294 
295  up = mi->mi_unrhdr;
296  mi->mi_unrhdr = NULL;
297  delete_unrhdr(up);
298 }
299 
300 /*
301  * Allocate a file number
302  */
303 static void
304 mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
305 {
306  /* make sure our parent has a file number */
307  if (mn->mn_parent && !mn->mn_parent->mn_fileno)
308  mqfs_fileno_alloc(mi, mn->mn_parent);
309 
310  switch (mn->mn_type) {
311  case mqfstype_root:
312  case mqfstype_dir:
313  case mqfstype_file:
314  case mqfstype_symlink:
315  mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
316  break;
317  case mqfstype_this:
318  KASSERT(mn->mn_parent != NULL,
319  ("mqfstype_this node has no parent"));
320  mn->mn_fileno = mn->mn_parent->mn_fileno;
321  break;
322  case mqfstype_parent:
323  KASSERT(mn->mn_parent != NULL,
324  ("mqfstype_parent node has no parent"));
325  if (mn->mn_parent == mi->mi_root) {
326  mn->mn_fileno = mn->mn_parent->mn_fileno;
327  break;
328  }
329  KASSERT(mn->mn_parent->mn_parent != NULL,
330  ("mqfstype_parent node has no grandparent"));
331  mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
332  break;
333  default:
334  KASSERT(0,
335  ("mqfs_fileno_alloc() called for unknown type node: %d",
336  mn->mn_type));
337  break;
338  }
339 }
340 
341 /*
342  * Release a file number
343  */
344 static void
345 mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
346 {
347  switch (mn->mn_type) {
348  case mqfstype_root:
349  case mqfstype_dir:
350  case mqfstype_file:
351  case mqfstype_symlink:
352  free_unr(mi->mi_unrhdr, mn->mn_fileno);
353  break;
354  case mqfstype_this:
355  case mqfstype_parent:
356  /* ignore these, as they don't "own" their file number */
357  break;
358  default:
359  KASSERT(0,
360  ("mqfs_fileno_free() called for unknown type node: %d",
361  mn->mn_type));
362  break;
363  }
364 }
365 
366 static __inline struct mqfs_node *
367 mqnode_alloc(void)
368 {
369  return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
370 }
371 
372 static __inline void
373 mqnode_free(struct mqfs_node *node)
374 {
375  uma_zfree(mqnode_zone, node);
376 }
377 
378 static __inline void
379 mqnode_addref(struct mqfs_node *node)
380 {
381  atomic_fetchadd_int(&node->mn_refcount, 1);
382 }
383 
384 static __inline void
385 mqnode_release(struct mqfs_node *node)
386 {
387  struct mqfs_info *mqfs;
388  int old, exp;
389 
390  mqfs = node->mn_info;
391  old = atomic_fetchadd_int(&node->mn_refcount, -1);
392  if (node->mn_type == mqfstype_dir ||
393  node->mn_type == mqfstype_root)
394  exp = 3; /* include . and .. */
395  else
396  exp = 1;
397  if (old == exp) {
398  int locked = sx_xlocked(&mqfs->mi_lock);
399  if (!locked)
400  sx_xlock(&mqfs->mi_lock);
401  mqfs_destroy(node);
402  if (!locked)
403  sx_xunlock(&mqfs->mi_lock);
404  }
405 }
406 
407 /*
408  * Add a node to a directory
409  */
410 static int
411 mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
412 {
413  KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
414  KASSERT(parent->mn_info != NULL,
415  ("%s(): parent has no mn_info", __func__));
416  KASSERT(parent->mn_type == mqfstype_dir ||
417  parent->mn_type == mqfstype_root,
418  ("%s(): parent is not a directory", __func__));
419 
420  node->mn_info = parent->mn_info;
421  node->mn_parent = parent;
422  LIST_INIT(&node->mn_children);
423  LIST_INIT(&node->mn_vnodes);
424  LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
425  mqnode_addref(parent);
426  return (0);
427 }
428 
429 static struct mqfs_node *
430 mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
431  int nodetype)
432 {
433  struct mqfs_node *node;
434 
435  node = mqnode_alloc();
436  strncpy(node->mn_name, name, namelen);
437  node->mn_type = nodetype;
438  node->mn_refcount = 1;
439  vfs_timestamp(&node->mn_birth);
440  node->mn_ctime = node->mn_atime = node->mn_mtime
441  = node->mn_birth;
442  node->mn_uid = cred->cr_uid;
443  node->mn_gid = cred->cr_gid;
444  node->mn_mode = mode;
445  return (node);
446 }
447 
448 /*
449  * Create a file
450  */
451 static struct mqfs_node *
452 mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
453  struct ucred *cred, int mode)
454 {
455  struct mqfs_node *node;
456 
457  node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
458  if (mqfs_add_node(parent, node) != 0) {
459  mqnode_free(node);
460  return (NULL);
461  }
462  return (node);
463 }
464 
465 /*
466  * Add . and .. to a directory
467  */
468 static int
469 mqfs_fixup_dir(struct mqfs_node *parent)
470 {
471  struct mqfs_node *dir;
472 
473  dir = mqnode_alloc();
474  dir->mn_name[0] = '.';
475  dir->mn_type = mqfstype_this;
476  dir->mn_refcount = 1;
477  if (mqfs_add_node(parent, dir) != 0) {
478  mqnode_free(dir);
479  return (-1);
480  }
481 
482  dir = mqnode_alloc();
483  dir->mn_name[0] = dir->mn_name[1] = '.';
484  dir->mn_type = mqfstype_parent;
485  dir->mn_refcount = 1;
486 
487  if (mqfs_add_node(parent, dir) != 0) {
488  mqnode_free(dir);
489  return (-1);
490  }
491 
492  return (0);
493 }
494 
495 #ifdef notyet
496 
497 /*
498  * Create a directory
499  */
500 static struct mqfs_node *
501 mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
502  struct ucred *cred, int mode)
503 {
504  struct mqfs_node *node;
505 
506  node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
507  if (mqfs_add_node(parent, node) != 0) {
508  mqnode_free(node);
509  return (NULL);
510  }
511 
512  if (mqfs_fixup_dir(node) != 0) {
513  mqfs_destroy(node);
514  return (NULL);
515  }
516  return (node);
517 }
518 
519 /*
520  * Create a symlink
521  */
522 static struct mqfs_node *
523 mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
524  struct ucred *cred, int mode)
525 {
526  struct mqfs_node *node;
527 
528  node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
529  if (mqfs_add_node(parent, node) != 0) {
530  mqnode_free(node);
531  return (NULL);
532  }
533  return (node);
534 }
535 
536 #endif
537 
538 /*
539  * Destroy a node or a tree of nodes
540  */
541 static int
542 mqfs_destroy(struct mqfs_node *node)
543 {
544  struct mqfs_node *parent;
545 
546  KASSERT(node != NULL,
547  ("%s(): node is NULL", __func__));
548  KASSERT(node->mn_info != NULL,
549  ("%s(): node has no mn_info", __func__));
550 
551  /* destroy children */
552  if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
553  while (! LIST_EMPTY(&node->mn_children))
554  mqfs_destroy(LIST_FIRST(&node->mn_children));
555 
556  /* unlink from parent */
557  if ((parent = node->mn_parent) != NULL) {
558  KASSERT(parent->mn_info == node->mn_info,
559  ("%s(): parent has different mn_info", __func__));
560  LIST_REMOVE(node, mn_sibling);
561  }
562 
563  if (node->mn_fileno != 0)
564  mqfs_fileno_free(node->mn_info, node);
565  if (node->mn_data != NULL)
566  mqueue_free(node->mn_data);
567  mqnode_free(node);
568  return (0);
569 }
570 
571 /*
572  * Mount a mqfs instance
573  */
574 static int
575 mqfs_mount(struct mount *mp)
576 {
577  struct statfs *sbp;
578 
579  if (mp->mnt_flag & MNT_UPDATE)
580  return (EOPNOTSUPP);
581 
582  mp->mnt_data = &mqfs_data;
583  MNT_ILOCK(mp);
584  mp->mnt_flag |= MNT_LOCAL;
585  mp->mnt_kern_flag |= MNTK_MPSAFE;
586  MNT_IUNLOCK(mp);
587  vfs_getnewfsid(mp);
588 
589  sbp = &mp->mnt_stat;
590  vfs_mountedfrom(mp, "mqueue");
591  sbp->f_bsize = PAGE_SIZE;
592  sbp->f_iosize = PAGE_SIZE;
593  sbp->f_blocks = 1;
594  sbp->f_bfree = 0;
595  sbp->f_bavail = 0;
596  sbp->f_files = 1;
597  sbp->f_ffree = 0;
598  return (0);
599 }
600 
601 /*
602  * Unmount a mqfs instance
603  */
604 static int
605 mqfs_unmount(struct mount *mp, int mntflags)
606 {
607  int error;
608 
609  error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
610  curthread);
611  return (error);
612 }
613 
614 /*
615  * Return a root vnode
616  */
617 static int
618 mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
619 {
620  struct mqfs_info *mqfs;
621  int ret;
622 
623  mqfs = VFSTOMQFS(mp);
624  ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
625  return (ret);
626 }
627 
628 /*
629  * Return filesystem stats
630  */
631 static int
632 mqfs_statfs(struct mount *mp, struct statfs *sbp)
633 {
634  /* XXX update statistics */
635  return (0);
636 }
637 
638 /*
639  * Initialize a mqfs instance
640  */
641 static int
642 mqfs_init(struct vfsconf *vfc)
643 {
644  struct mqfs_node *root;
645  struct mqfs_info *mi;
646 
647  mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
648  NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
649  mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
650  NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
651  mvdata_zone = uma_zcreate("mvdata",
652  sizeof(struct mqfs_vdata), NULL, NULL, NULL,
653  NULL, UMA_ALIGN_PTR, 0);
654  mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
655  NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
656  mi = &mqfs_data;
657  sx_init(&mi->mi_lock, "mqfs lock");
658  /* set up the root diretory */
659  root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
660  mqfstype_root);
661  root->mn_info = mi;
662  LIST_INIT(&root->mn_children);
663  LIST_INIT(&root->mn_vnodes);
664  mi->mi_root = root;
665  mqfs_fileno_init(mi);
666  mqfs_fileno_alloc(mi, root);
667  mqfs_fixup_dir(root);
668  exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
669  EVENTHANDLER_PRI_ANY);
670  mq_fdclose = mqueue_fdclose;
671  p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
672  return (0);
673 }
674 
675 /*
676  * Destroy a mqfs instance
677  */
678 static int
679 mqfs_uninit(struct vfsconf *vfc)
680 {
681  struct mqfs_info *mi;
682 
683  if (!unloadable)
684  return (EOPNOTSUPP);
685  EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
686  mi = &mqfs_data;
687  mqfs_destroy(mi->mi_root);
688  mi->mi_root = NULL;
689  mqfs_fileno_uninit(mi);
690  sx_destroy(&mi->mi_lock);
691  uma_zdestroy(mqnode_zone);
692  uma_zdestroy(mqueue_zone);
693  uma_zdestroy(mvdata_zone);
694  uma_zdestroy(mqnoti_zone);
695  return (0);
696 }
697 
698 /*
699  * task routine
700  */
701 static void
702 do_recycle(void *context, int pending __unused)
703 {
704  struct vnode *vp = (struct vnode *)context;
705 
706  vrecycle(vp, curthread);
707  vdrop(vp);
708 }
709 
710 /*
711  * Allocate a vnode
712  */
713 static int
714 mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
715 {
716  struct mqfs_vdata *vd;
717  struct mqfs_info *mqfs;
718  struct vnode *newvpp;
719  int error;
720 
721  mqfs = pn->mn_info;
722  *vpp = NULL;
723  sx_xlock(&mqfs->mi_lock);
724  LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
725  if (vd->mv_vnode->v_mount == mp) {
726  vhold(vd->mv_vnode);
727  break;
728  }
729  }
730 
731  if (vd != NULL) {
732 found:
733  *vpp = vd->mv_vnode;
734  sx_xunlock(&mqfs->mi_lock);
735  error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
736  vdrop(*vpp);
737  return (error);
738  }
739  sx_xunlock(&mqfs->mi_lock);
740 
741  error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
742  if (error)
743  return (error);
744  vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
745  error = insmntque(newvpp, mp);
746  if (error != 0)
747  return (error);
748 
749  sx_xlock(&mqfs->mi_lock);
750  /*
751  * Check if it has already been allocated
752  * while we were blocked.
753  */
754  LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
755  if (vd->mv_vnode->v_mount == mp) {
756  vhold(vd->mv_vnode);
757  sx_xunlock(&mqfs->mi_lock);
758 
759  vgone(newvpp);
760  vput(newvpp);
761  goto found;
762  }
763  }
764 
765  *vpp = newvpp;
766 
767  vd = uma_zalloc(mvdata_zone, M_WAITOK);
768  (*vpp)->v_data = vd;
769  vd->mv_vnode = *vpp;
770  vd->mv_node = pn;
771  TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
772  LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
773  mqnode_addref(pn);
774  switch (pn->mn_type) {
775  case mqfstype_root:
776  (*vpp)->v_vflag = VV_ROOT;
777  /* fall through */
778  case mqfstype_dir:
779  case mqfstype_this:
780  case mqfstype_parent:
781  (*vpp)->v_type = VDIR;
782  break;
783  case mqfstype_file:
784  (*vpp)->v_type = VREG;
785  break;
786  case mqfstype_symlink:
787  (*vpp)->v_type = VLNK;
788  break;
789  case mqfstype_none:
790  KASSERT(0, ("mqfs_allocf called for null node\n"));
791  default:
792  panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
793  }
794  sx_xunlock(&mqfs->mi_lock);
795  return (0);
796 }
797 
798 /*
799  * Search a directory entry
800  */
801 static struct mqfs_node *
802 mqfs_search(struct mqfs_node *pd, const char *name, int len)
803 {
804  struct mqfs_node *pn;
805 
806  sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
807  LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
808  if (strncmp(pn->mn_name, name, len) == 0 &&
809  pn->mn_name[len] == '\0')
810  return (pn);
811  }
812  return (NULL);
813 }
814 
815 /*
816  * Look up a file or directory.
817  */
818 static int
819 mqfs_lookupx(struct vop_cachedlookup_args *ap)
820 {
821  struct componentname *cnp;
822  struct vnode *dvp, **vpp;
823  struct mqfs_node *pd;
824  struct mqfs_node *pn;
825  struct mqfs_info *mqfs;
826  int nameiop, flags, error, namelen;
827  char *pname;
828  struct thread *td;
829 
830  cnp = ap->a_cnp;
831  vpp = ap->a_vpp;
832  dvp = ap->a_dvp;
833  pname = cnp->cn_nameptr;
834  namelen = cnp->cn_namelen;
835  td = cnp->cn_thread;
836  flags = cnp->cn_flags;
837  nameiop = cnp->cn_nameiop;
838  pd = VTON(dvp);
839  pn = NULL;
840  mqfs = pd->mn_info;
841  *vpp = NULLVP;
842 
843  if (dvp->v_type != VDIR)
844  return (ENOTDIR);
845 
846  error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
847  if (error)
848  return (error);
849 
850  /* shortcut: check if the name is too long */
851  if (cnp->cn_namelen >= MQFS_NAMELEN)
852  return (ENOENT);
853 
854  /* self */
855  if (namelen == 1 && pname[0] == '.') {
856  if ((flags & ISLASTCN) && nameiop != LOOKUP)
857  return (EINVAL);
858  pn = pd;
859  *vpp = dvp;
860  VREF(dvp);
861  return (0);
862  }
863 
864  /* parent */
865  if (cnp->cn_flags & ISDOTDOT) {
866  if (dvp->v_vflag & VV_ROOT)
867  return (EIO);
868  if ((flags & ISLASTCN) && nameiop != LOOKUP)
869  return (EINVAL);
870  VOP_UNLOCK(dvp, 0);
871  KASSERT(pd->mn_parent, ("non-root directory has no parent"));
872  pn = pd->mn_parent;
873  error = mqfs_allocv(dvp->v_mount, vpp, pn);
874  vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
875  return (error);
876  }
877 
878  /* named node */
879  sx_xlock(&mqfs->mi_lock);
880  pn = mqfs_search(pd, pname, namelen);
881  if (pn != NULL)
882  mqnode_addref(pn);
883  sx_xunlock(&mqfs->mi_lock);
884 
885  /* found */
886  if (pn != NULL) {
887  /* DELETE */
888  if (nameiop == DELETE && (flags & ISLASTCN)) {
889  error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
890  if (error) {
891  mqnode_release(pn);
892  return (error);
893  }
894  if (*vpp == dvp) {
895  VREF(dvp);
896  *vpp = dvp;
897  mqnode_release(pn);
898  return (0);
899  }
900  }
901 
902  /* allocate vnode */
903  error = mqfs_allocv(dvp->v_mount, vpp, pn);
904  mqnode_release(pn);
905  if (error == 0 && cnp->cn_flags & MAKEENTRY)
906  cache_enter(dvp, *vpp, cnp);
907  return (error);
908  }
909 
910  /* not found */
911 
912  /* will create a new entry in the directory ? */
913  if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
914  && (flags & ISLASTCN)) {
915  error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
916  if (error)
917  return (error);
918  cnp->cn_flags |= SAVENAME;
919  return (EJUSTRETURN);
920  }
921  return (ENOENT);
922 }
923 
924 #if 0
925 struct vop_lookup_args {
926  struct vop_generic_args a_gen;
927  struct vnode *a_dvp;
928  struct vnode **a_vpp;
929  struct componentname *a_cnp;
930 };
931 #endif
932 
933 /*
934  * vnode lookup operation
935  */
936 static int
937 mqfs_lookup(struct vop_cachedlookup_args *ap)
938 {
939  int rc;
940 
941  rc = mqfs_lookupx(ap);
942  return (rc);
943 }
944 
945 #if 0
946 struct vop_create_args {
947  struct vnode *a_dvp;
948  struct vnode **a_vpp;
949  struct componentname *a_cnp;
950  struct vattr *a_vap;
951 };
952 #endif
953 
954 /*
955  * vnode creation operation
956  */
957 static int
958 mqfs_create(struct vop_create_args *ap)
959 {
960  struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
961  struct componentname *cnp = ap->a_cnp;
962  struct mqfs_node *pd;
963  struct mqfs_node *pn;
964  struct mqueue *mq;
965  int error;
966 
967  pd = VTON(ap->a_dvp);
968  if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
969  return (ENOTDIR);
970  mq = mqueue_alloc(NULL);
971  if (mq == NULL)
972  return (EAGAIN);
973  sx_xlock(&mqfs->mi_lock);
974  if ((cnp->cn_flags & HASBUF) == 0)
975  panic("%s: no name", __func__);
976  pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
977  cnp->cn_cred, ap->a_vap->va_mode);
978  if (pn == NULL) {
979  sx_xunlock(&mqfs->mi_lock);
980  error = ENOSPC;
981  } else {
982  mqnode_addref(pn);
983  sx_xunlock(&mqfs->mi_lock);
984  error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
985  mqnode_release(pn);
986  if (error)
987  mqfs_destroy(pn);
988  else
989  pn->mn_data = mq;
990  }
991  if (error)
992  mqueue_free(mq);
993  return (error);
994 }
995 
996 /*
997  * Remove an entry
998  */
999 static
1000 int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
1001 {
1002  struct mqfs_node *parent;
1003  struct mqfs_vdata *vd;
1004  int error = 0;
1005 
1006  sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
1007 
1008  if (ucred->cr_uid != pn->mn_uid &&
1009  (error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
1010  error = EACCES;
1011  else if (!pn->mn_deleted) {
1012  parent = pn->mn_parent;
1013  pn->mn_parent = NULL;
1014  pn->mn_deleted = 1;
1015  LIST_REMOVE(pn, mn_sibling);
1016  LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
1017  cache_purge(vd->mv_vnode);
1018  vhold(vd->mv_vnode);
1019  taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
1020  }
1021  mqnode_release(pn);
1022  mqnode_release(parent);
1023  } else
1024  error = ENOENT;
1025  return (error);
1026 }
1027 
1028 #if 0
1029 struct vop_remove_args {
1030  struct vnode *a_dvp;
1031  struct vnode *a_vp;
1032  struct componentname *a_cnp;
1033 };
1034 #endif
1035 
1036 /*
1037  * vnode removal operation
1038  */
1039 static int
1040 mqfs_remove(struct vop_remove_args *ap)
1041 {
1042  struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1043  struct mqfs_node *pn;
1044  int error;
1045 
1046  if (ap->a_vp->v_type == VDIR)
1047  return (EPERM);
1048  pn = VTON(ap->a_vp);
1049  sx_xlock(&mqfs->mi_lock);
1050  error = do_unlink(pn, ap->a_cnp->cn_cred);
1051  sx_xunlock(&mqfs->mi_lock);
1052  return (error);
1053 }
1054 
1055 #if 0
1056 struct vop_inactive_args {
1057  struct vnode *a_vp;
1058  struct thread *a_td;
1059 };
1060 #endif
1061 
1062 static int
1063 mqfs_inactive(struct vop_inactive_args *ap)
1064 {
1065  struct mqfs_node *pn = VTON(ap->a_vp);
1066 
1067  if (pn->mn_deleted)
1068  vrecycle(ap->a_vp, ap->a_td);
1069  return (0);
1070 }
1071 
1072 #if 0
1073 struct vop_reclaim_args {
1074  struct vop_generic_args a_gen;
1075  struct vnode *a_vp;
1076  struct thread *a_td;
1077 };
1078 #endif
1079 
1080 static int
1081 mqfs_reclaim(struct vop_reclaim_args *ap)
1082 {
1083  struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
1084  struct vnode *vp = ap->a_vp;
1085  struct mqfs_node *pn;
1086  struct mqfs_vdata *vd;
1087 
1088  vd = vp->v_data;
1089  pn = vd->mv_node;
1090  sx_xlock(&mqfs->mi_lock);
1091  vp->v_data = NULL;
1092  LIST_REMOVE(vd, mv_link);
1093  uma_zfree(mvdata_zone, vd);
1094  mqnode_release(pn);
1095  sx_xunlock(&mqfs->mi_lock);
1096  return (0);
1097 }
1098 
1099 #if 0
1100 struct vop_open_args {
1101  struct vop_generic_args a_gen;
1102  struct vnode *a_vp;
1103  int a_mode;
1104  struct ucred *a_cred;
1105  struct thread *a_td;
1106  struct file *a_fp;
1107 };
1108 #endif
1109 
1110 static int
1111 mqfs_open(struct vop_open_args *ap)
1112 {
1113  return (0);
1114 }
1115 
1116 #if 0
1117 struct vop_close_args {
1118  struct vop_generic_args a_gen;
1119  struct vnode *a_vp;
1120  int a_fflag;
1121  struct ucred *a_cred;
1122  struct thread *a_td;
1123 };
1124 #endif
1125 
1126 static int
1127 mqfs_close(struct vop_close_args *ap)
1128 {
1129  return (0);
1130 }
1131 
1132 #if 0
1133 struct vop_access_args {
1134  struct vop_generic_args a_gen;
1135  struct vnode *a_vp;
1136  accmode_t a_accmode;
1137  struct ucred *a_cred;
1138  struct thread *a_td;
1139 };
1140 #endif
1141 
1142 /*
1143  * Verify permissions
1144  */
1145 static int
1146 mqfs_access(struct vop_access_args *ap)
1147 {
1148  struct vnode *vp = ap->a_vp;
1149  struct vattr vattr;
1150  int error;
1151 
1152  error = VOP_GETATTR(vp, &vattr, ap->a_cred);
1153  if (error)
1154  return (error);
1155  error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
1156  vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
1157  return (error);
1158 }
1159 
1160 #if 0
1161 struct vop_getattr_args {
1162  struct vop_generic_args a_gen;
1163  struct vnode *a_vp;
1164  struct vattr *a_vap;
1165  struct ucred *a_cred;
1166 };
1167 #endif
1168 
1169 /*
1170  * Get file attributes
1171  */
1172 static int
1173 mqfs_getattr(struct vop_getattr_args *ap)
1174 {
1175  struct vnode *vp = ap->a_vp;
1176  struct mqfs_node *pn = VTON(vp);
1177  struct vattr *vap = ap->a_vap;
1178  int error = 0;
1179 
1180  vap->va_type = vp->v_type;
1181  vap->va_mode = pn->mn_mode;
1182  vap->va_nlink = 1;
1183  vap->va_uid = pn->mn_uid;
1184  vap->va_gid = pn->mn_gid;
1185  vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
1186  vap->va_fileid = pn->mn_fileno;
1187  vap->va_size = 0;
1188  vap->va_blocksize = PAGE_SIZE;
1189  vap->va_bytes = vap->va_size = 0;
1190  vap->va_atime = pn->mn_atime;
1191  vap->va_mtime = pn->mn_mtime;
1192  vap->va_ctime = pn->mn_ctime;
1193  vap->va_birthtime = pn->mn_birth;
1194  vap->va_gen = 0;
1195  vap->va_flags = 0;
1196  vap->va_rdev = NODEV;
1197  vap->va_bytes = 0;
1198  vap->va_filerev = 0;
1199  return (error);
1200 }
1201 
1202 #if 0
1203 struct vop_setattr_args {
1204  struct vop_generic_args a_gen;
1205  struct vnode *a_vp;
1206  struct vattr *a_vap;
1207  struct ucred *a_cred;
1208 };
1209 #endif
1210 /*
1211  * Set attributes
1212  */
1213 static int
1214 mqfs_setattr(struct vop_setattr_args *ap)
1215 {
1216  struct mqfs_node *pn;
1217  struct vattr *vap;
1218  struct vnode *vp;
1219  struct thread *td;
1220  int c, error;
1221  uid_t uid;
1222  gid_t gid;
1223 
1224  td = curthread;
1225  vap = ap->a_vap;
1226  vp = ap->a_vp;
1227  if ((vap->va_type != VNON) ||
1228  (vap->va_nlink != VNOVAL) ||
1229  (vap->va_fsid != VNOVAL) ||
1230  (vap->va_fileid != VNOVAL) ||
1231  (vap->va_blocksize != VNOVAL) ||
1232  (vap->va_flags != VNOVAL && vap->va_flags != 0) ||
1233  (vap->va_rdev != VNOVAL) ||
1234  ((int)vap->va_bytes != VNOVAL) ||
1235  (vap->va_gen != VNOVAL)) {
1236  return (EINVAL);
1237  }
1238 
1239  pn = VTON(vp);
1240 
1241  error = c = 0;
1242  if (vap->va_uid == (uid_t)VNOVAL)
1243  uid = pn->mn_uid;
1244  else
1245  uid = vap->va_uid;
1246  if (vap->va_gid == (gid_t)VNOVAL)
1247  gid = pn->mn_gid;
1248  else
1249  gid = vap->va_gid;
1250 
1251  if (uid != pn->mn_uid || gid != pn->mn_gid) {
1252  /*
1253  * To modify the ownership of a file, must possess VADMIN
1254  * for that file.
1255  */
1256  if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
1257  return (error);
1258 
1259  /*
1260  * XXXRW: Why is there a privilege check here: shouldn't the
1261  * check in VOP_ACCESS() be enough? Also, are the group bits
1262  * below definitely right?
1263  */
1264  if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
1265  (gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
1266  (error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
1267  return (error);
1268  pn->mn_uid = uid;
1269  pn->mn_gid = gid;
1270  c = 1;
1271  }
1272 
1273  if (vap->va_mode != (mode_t)VNOVAL) {
1274  if ((ap->a_cred->cr_uid != pn->mn_uid) &&
1275  (error = priv_check(td, PRIV_MQ_ADMIN)))
1276  return (error);
1277  pn->mn_mode = vap->va_mode;
1278  c = 1;
1279  }
1280 
1281  if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
1282  /* See the comment in ufs_vnops::ufs_setattr(). */
1283  if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
1284  ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
1285  (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
1286  return (error);
1287  if (vap->va_atime.tv_sec != VNOVAL) {
1288  pn->mn_atime = vap->va_atime;
1289  }
1290  if (vap->va_mtime.tv_sec != VNOVAL) {
1291  pn->mn_mtime = vap->va_mtime;
1292  }
1293  c = 1;
1294  }
1295  if (c) {
1296  vfs_timestamp(&pn->mn_ctime);
1297  }
1298  return (0);
1299 }
1300 
1301 #if 0
1302 struct vop_read_args {
1303  struct vop_generic_args a_gen;
1304  struct vnode *a_vp;
1305  struct uio *a_uio;
1306  int a_ioflag;
1307  struct ucred *a_cred;
1308 };
1309 #endif
1310 
1311 /*
1312  * Read from a file
1313  */
1314 static int
1315 mqfs_read(struct vop_read_args *ap)
1316 {
1317  char buf[80];
1318  struct vnode *vp = ap->a_vp;
1319  struct uio *uio = ap->a_uio;
1320  struct mqfs_node *pn;
1321  struct mqueue *mq;
1322  int len, error;
1323 
1324  if (vp->v_type != VREG)
1325  return (EINVAL);
1326 
1327  pn = VTON(vp);
1328  mq = VTOMQ(vp);
1329  snprintf(buf, sizeof(buf),
1330  "QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
1331  mq->mq_totalbytes,
1332  mq->mq_maxmsg,
1333  mq->mq_curmsgs,
1334  mq->mq_msgsize);
1335  buf[sizeof(buf)-1] = '\0';
1336  len = strlen(buf);
1337  error = uiomove_frombuf(buf, len, uio);
1338  return (error);
1339 }
1340 
1341 #if 0
1342 struct vop_readdir_args {
1343  struct vop_generic_args a_gen;
1344  struct vnode *a_vp;
1345  struct uio *a_uio;
1346  struct ucred *a_cred;
1347  int *a_eofflag;
1348  int *a_ncookies;
1349  u_long **a_cookies;
1350 };
1351 #endif
1352 
1353 /*
1354  * Return directory entries.
1355  */
1356 static int
1357 mqfs_readdir(struct vop_readdir_args *ap)
1358 {
1359  struct vnode *vp;
1360  struct mqfs_info *mi;
1361  struct mqfs_node *pd;
1362  struct mqfs_node *pn;
1363  struct dirent entry;
1364  struct uio *uio;
1365  int *tmp_ncookies = NULL;
1366  off_t offset;
1367  int error, i;
1368 
1369  vp = ap->a_vp;
1370  mi = VFSTOMQFS(vp->v_mount);
1371  pd = VTON(vp);
1372  uio = ap->a_uio;
1373 
1374  if (vp->v_type != VDIR)
1375  return (ENOTDIR);
1376 
1377  if (uio->uio_offset < 0)
1378  return (EINVAL);
1379 
1380  if (ap->a_ncookies != NULL) {
1381  tmp_ncookies = ap->a_ncookies;
1382  *ap->a_ncookies = 0;
1383  ap->a_ncookies = NULL;
1384  }
1385 
1386  error = 0;
1387  offset = 0;
1388 
1389  sx_xlock(&mi->mi_lock);
1390 
1391  LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
1392  entry.d_reclen = sizeof(entry);
1393  if (!pn->mn_fileno)
1394  mqfs_fileno_alloc(mi, pn);
1395  entry.d_fileno = pn->mn_fileno;
1396  for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
1397  entry.d_name[i] = pn->mn_name[i];
1398  entry.d_name[i] = 0;
1399  entry.d_namlen = i;
1400  switch (pn->mn_type) {
1401  case mqfstype_root:
1402  case mqfstype_dir:
1403  case mqfstype_this:
1404  case mqfstype_parent:
1405  entry.d_type = DT_DIR;
1406  break;
1407  case mqfstype_file:
1408  entry.d_type = DT_REG;
1409  break;
1410  case mqfstype_symlink:
1411  entry.d_type = DT_LNK;
1412  break;
1413  default:
1414  panic("%s has unexpected node type: %d", pn->mn_name,
1415  pn->mn_type);
1416  }
1417  if (entry.d_reclen > uio->uio_resid)
1418  break;
1419  if (offset >= uio->uio_offset) {
1420  error = vfs_read_dirent(ap, &entry, offset);
1421  if (error)
1422  break;
1423  }
1424  offset += entry.d_reclen;
1425  }
1426  sx_xunlock(&mi->mi_lock);
1427 
1428  uio->uio_offset = offset;
1429 
1430  if (tmp_ncookies != NULL)
1431  ap->a_ncookies = tmp_ncookies;
1432 
1433  return (error);
1434 }
1435 
1436 #ifdef notyet
1437 
1438 #if 0
1439 struct vop_mkdir_args {
1440  struct vnode *a_dvp;
1441  struvt vnode **a_vpp;
1442  struvt componentname *a_cnp;
1443  struct vattr *a_vap;
1444 };
1445 #endif
1446 
1447 /*
1448  * Create a directory.
1449  */
1450 static int
1451 mqfs_mkdir(struct vop_mkdir_args *ap)
1452 {
1453  struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1454  struct componentname *cnp = ap->a_cnp;
1455  struct mqfs_node *pd = VTON(ap->a_dvp);
1456  struct mqfs_node *pn;
1457  int error;
1458 
1459  if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
1460  return (ENOTDIR);
1461  sx_xlock(&mqfs->mi_lock);
1462  if ((cnp->cn_flags & HASBUF) == 0)
1463  panic("%s: no name", __func__);
1464  pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
1465  ap->a_vap->cn_cred, ap->a_vap->va_mode);
1466  if (pn != NULL)
1467  mqnode_addref(pn);
1468  sx_xunlock(&mqfs->mi_lock);
1469  if (pn == NULL) {
1470  error = ENOSPC;
1471  } else {
1472  error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
1473  mqnode_release(pn);
1474  }
1475  return (error);
1476 }
1477 
1478 #if 0
1479 struct vop_rmdir_args {
1480  struct vnode *a_dvp;
1481  struct vnode *a_vp;
1482  struct componentname *a_cnp;
1483 };
1484 #endif
1485 
1486 /*
1487  * Remove a directory.
1488  */
1489 static int
1490 mqfs_rmdir(struct vop_rmdir_args *ap)
1491 {
1492  struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
1493  struct mqfs_node *pn = VTON(ap->a_vp);
1494  struct mqfs_node *pt;
1495 
1496  if (pn->mn_type != mqfstype_dir)
1497  return (ENOTDIR);
1498 
1499  sx_xlock(&mqfs->mi_lock);
1500  if (pn->mn_deleted) {
1501  sx_xunlock(&mqfs->mi_lock);
1502  return (ENOENT);
1503  }
1504 
1505  pt = LIST_FIRST(&pn->mn_children);
1506  pt = LIST_NEXT(pt, mn_sibling);
1507  pt = LIST_NEXT(pt, mn_sibling);
1508  if (pt != NULL) {
1509  sx_xunlock(&mqfs->mi_lock);
1510  return (ENOTEMPTY);
1511  }
1512  pt = pn->mn_parent;
1513  pn->mn_parent = NULL;
1514  pn->mn_deleted = 1;
1515  LIST_REMOVE(pn, mn_sibling);
1516  mqnode_release(pn);
1517  mqnode_release(pt);
1518  sx_xunlock(&mqfs->mi_lock);
1519  cache_purge(ap->a_vp);
1520  return (0);
1521 }
1522 
1523 #endif /* notyet */
1524 
1525 /*
1526  * Allocate a message queue
1527  */
1528 static struct mqueue *
1529 mqueue_alloc(const struct mq_attr *attr)
1530 {
1531  struct mqueue *mq;
1532 
1533  if (curmq >= maxmq)
1534  return (NULL);
1535  mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
1536  TAILQ_INIT(&mq->mq_msgq);
1537  if (attr != NULL) {
1538  mq->mq_maxmsg = attr->mq_maxmsg;
1539  mq->mq_msgsize = attr->mq_msgsize;
1540  } else {
1541  mq->mq_maxmsg = default_maxmsg;
1542  mq->mq_msgsize = default_msgsize;
1543  }
1544  mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
1545  knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
1546  knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
1547  atomic_add_int(&curmq, 1);
1548  return (mq);
1549 }
1550 
1551 /*
1552  * Destroy a message queue
1553  */
1554 static void
1555 mqueue_free(struct mqueue *mq)
1556 {
1557  struct mqueue_msg *msg;
1558 
1559  while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
1560  TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
1561  free(msg, M_MQUEUEDATA);
1562  }
1563 
1564  mtx_destroy(&mq->mq_mutex);
1565  seldrain(&mq->mq_rsel);
1566  seldrain(&mq->mq_wsel);
1567  knlist_destroy(&mq->mq_rsel.si_note);
1568  knlist_destroy(&mq->mq_wsel.si_note);
1569  uma_zfree(mqueue_zone, mq);
1570  atomic_add_int(&curmq, -1);
1571 }
1572 
1573 /*
1574  * Load a message from user space
1575  */
1576 static struct mqueue_msg *
1577 mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
1578 {
1579  struct mqueue_msg *msg;
1580  size_t len;
1581  int error;
1582 
1583  len = sizeof(struct mqueue_msg) + msg_size;
1584  msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
1585  error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
1586  msg_size);
1587  if (error) {
1588  free(msg, M_MQUEUEDATA);
1589  msg = NULL;
1590  } else {
1591  msg->msg_size = msg_size;
1592  msg->msg_prio = msg_prio;
1593  }
1594  return (msg);
1595 }
1596 
1597 /*
1598  * Save a message to user space
1599  */
1600 static int
1601 mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
1602 {
1603  int error;
1604 
1605  error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
1606  msg->msg_size);
1607  if (error == 0 && msg_prio != NULL)
1608  error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
1609  return (error);
1610 }
1611 
1612 /*
1613  * Free a message's memory
1614  */
1615 static __inline void
1616 mqueue_freemsg(struct mqueue_msg *msg)
1617 {
1618  free(msg, M_MQUEUEDATA);
1619 }
1620 
1621 /*
1622  * Send a message. if waitok is false, thread will not be
1623  * blocked if there is no data in queue, otherwise, absolute
1624  * time will be checked.
1625  */
1626 int
1627 mqueue_send(struct mqueue *mq, const char *msg_ptr,
1628  size_t msg_len, unsigned msg_prio, int waitok,
1629  const struct timespec *abs_timeout)
1630 {
1631  struct mqueue_msg *msg;
1632  struct timespec ts, ts2;
1633  struct timeval tv;
1634  int error;
1635 
1636  if (msg_prio >= MQ_PRIO_MAX)
1637  return (EINVAL);
1638  if (msg_len > mq->mq_msgsize)
1639  return (EMSGSIZE);
1640  msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
1641  if (msg == NULL)
1642  return (EFAULT);
1643 
1644  /* O_NONBLOCK case */
1645  if (!waitok) {
1646  error = _mqueue_send(mq, msg, -1);
1647  if (error)
1648  goto bad;
1649  return (0);
1650  }
1651 
1652  /* we allow a null timeout (wait forever) */
1653  if (abs_timeout == NULL) {
1654  error = _mqueue_send(mq, msg, 0);
1655  if (error)
1656  goto bad;
1657  return (0);
1658  }
1659 
1660  /* send it before checking time */
1661  error = _mqueue_send(mq, msg, -1);
1662  if (error == 0)
1663  return (0);
1664 
1665  if (error != EAGAIN)
1666  goto bad;
1667 
1668  if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1669  error = EINVAL;
1670  goto bad;
1671  }
1672  for (;;) {
1673  ts2 = *abs_timeout;
1674  getnanotime(&ts);
1675  timespecsub(&ts2, &ts);
1676  if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1677  error = ETIMEDOUT;
1678  break;
1679  }
1680  TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1681  error = _mqueue_send(mq, msg, tvtohz(&tv));
1682  if (error != ETIMEDOUT)
1683  break;
1684  }
1685  if (error == 0)
1686  return (0);
1687 bad:
1688  mqueue_freemsg(msg);
1689  return (error);
1690 }
1691 
1692 /*
1693  * Common routine to send a message
1694  */
1695 static int
1696 _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
1697 {
1698  struct mqueue_msg *msg2;
1699  int error = 0;
1700 
1701  mtx_lock(&mq->mq_mutex);
1702  while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
1703  if (timo < 0) {
1704  mtx_unlock(&mq->mq_mutex);
1705  return (EAGAIN);
1706  }
1707  mq->mq_senders++;
1708  error = msleep(&mq->mq_senders, &mq->mq_mutex,
1709  PCATCH, "mqsend", timo);
1710  mq->mq_senders--;
1711  if (error == EAGAIN)
1712  error = ETIMEDOUT;
1713  }
1714  if (mq->mq_curmsgs >= mq->mq_maxmsg) {
1715  mtx_unlock(&mq->mq_mutex);
1716  return (error);
1717  }
1718  error = 0;
1719  if (TAILQ_EMPTY(&mq->mq_msgq)) {
1720  TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
1721  } else {
1722  if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
1723  TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
1724  } else {
1725  TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
1726  if (msg2->msg_prio < msg->msg_prio)
1727  break;
1728  }
1729  TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
1730  }
1731  }
1732  mq->mq_curmsgs++;
1733  mq->mq_totalbytes += msg->msg_size;
1734  if (mq->mq_receivers)
1735  wakeup_one(&mq->mq_receivers);
1736  else if (mq->mq_notifier != NULL)
1737  mqueue_send_notification(mq);
1738  if (mq->mq_flags & MQ_RSEL) {
1739  mq->mq_flags &= ~MQ_RSEL;
1740  selwakeup(&mq->mq_rsel);
1741  }
1742  KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
1743  mtx_unlock(&mq->mq_mutex);
1744  return (0);
1745 }
1746 
1747 /*
1748  * Send realtime a signal to process which registered itself
1749  * successfully by mq_notify.
1750  */
1751 static void
1752 mqueue_send_notification(struct mqueue *mq)
1753 {
1754  struct mqueue_notifier *nt;
1755  struct thread *td;
1756  struct proc *p;
1757  int error;
1758 
1759  mtx_assert(&mq->mq_mutex, MA_OWNED);
1760  nt = mq->mq_notifier;
1761  if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
1762  p = nt->nt_proc;
1763  error = sigev_findtd(p, &nt->nt_sigev, &td);
1764  if (error) {
1765  mq->mq_notifier = NULL;
1766  return;
1767  }
1768  if (!KSI_ONQ(&nt->nt_ksi)) {
1769  ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
1770  tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
1771  }
1772  PROC_UNLOCK(p);
1773  }
1774  mq->mq_notifier = NULL;
1775 }
1776 
1777 /*
1778  * Get a message. if waitok is false, thread will not be
1779  * blocked if there is no data in queue, otherwise, absolute
1780  * time will be checked.
1781  */
1782 int
1783 mqueue_receive(struct mqueue *mq, char *msg_ptr,
1784  size_t msg_len, unsigned *msg_prio, int waitok,
1785  const struct timespec *abs_timeout)
1786 {
1787  struct mqueue_msg *msg;
1788  struct timespec ts, ts2;
1789  struct timeval tv;
1790  int error;
1791 
1792  if (msg_len < mq->mq_msgsize)
1793  return (EMSGSIZE);
1794 
1795  /* O_NONBLOCK case */
1796  if (!waitok) {
1797  error = _mqueue_recv(mq, &msg, -1);
1798  if (error)
1799  return (error);
1800  goto received;
1801  }
1802 
1803  /* we allow a null timeout (wait forever). */
1804  if (abs_timeout == NULL) {
1805  error = _mqueue_recv(mq, &msg, 0);
1806  if (error)
1807  return (error);
1808  goto received;
1809  }
1810 
1811  /* try to get a message before checking time */
1812  error = _mqueue_recv(mq, &msg, -1);
1813  if (error == 0)
1814  goto received;
1815 
1816  if (error != EAGAIN)
1817  return (error);
1818 
1819  if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
1820  error = EINVAL;
1821  return (error);
1822  }
1823 
1824  for (;;) {
1825  ts2 = *abs_timeout;
1826  getnanotime(&ts);
1827  timespecsub(&ts2, &ts);
1828  if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
1829  error = ETIMEDOUT;
1830  return (error);
1831  }
1832  TIMESPEC_TO_TIMEVAL(&tv, &ts2);
1833  error = _mqueue_recv(mq, &msg, tvtohz(&tv));
1834  if (error == 0)
1835  break;
1836  if (error != ETIMEDOUT)
1837  return (error);
1838  }
1839 
1840 received:
1841  error = mqueue_savemsg(msg, msg_ptr, msg_prio);
1842  if (error == 0) {
1843  curthread->td_retval[0] = msg->msg_size;
1844  curthread->td_retval[1] = 0;
1845  }
1846  mqueue_freemsg(msg);
1847  return (error);
1848 }
1849 
1850 /*
1851  * Common routine to receive a message
1852  */
1853 static int
1854 _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
1855 {
1856  int error = 0;
1857 
1858  mtx_lock(&mq->mq_mutex);
1859  while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
1860  if (timo < 0) {
1861  mtx_unlock(&mq->mq_mutex);
1862  return (EAGAIN);
1863  }
1864  mq->mq_receivers++;
1865  error = msleep(&mq->mq_receivers, &mq->mq_mutex,
1866  PCATCH, "mqrecv", timo);
1867  mq->mq_receivers--;
1868  if (error == EAGAIN)
1869  error = ETIMEDOUT;
1870  }
1871  if (*msg != NULL) {
1872  error = 0;
1873  TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
1874  mq->mq_curmsgs--;
1875  mq->mq_totalbytes -= (*msg)->msg_size;
1876  if (mq->mq_senders)
1877  wakeup_one(&mq->mq_senders);
1878  if (mq->mq_flags & MQ_WSEL) {
1879  mq->mq_flags &= ~MQ_WSEL;
1880  selwakeup(&mq->mq_wsel);
1881  }
1882  KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
1883  }
1884  if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
1885  !TAILQ_EMPTY(&mq->mq_msgq)) {
1886  mqueue_send_notification(mq);
1887  }
1888  mtx_unlock(&mq->mq_mutex);
1889  return (error);
1890 }
1891 
1892 static __inline struct mqueue_notifier *
1893 notifier_alloc(void)
1894 {
1895  return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
1896 }
1897 
1898 static __inline void
1899 notifier_free(struct mqueue_notifier *p)
1900 {
1901  uma_zfree(mqnoti_zone, p);
1902 }
1903 
1904 static struct mqueue_notifier *
1905 notifier_search(struct proc *p, int fd)
1906 {
1907  struct mqueue_notifier *nt;
1908 
1909  LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
1910  if (nt->nt_ksi.ksi_mqd == fd)
1911  break;
1912  }
1913  return (nt);
1914 }
1915 
1916 static __inline void
1917 notifier_insert(struct proc *p, struct mqueue_notifier *nt)
1918 {
1919  LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
1920 }
1921 
1922 static __inline void
1923 notifier_delete(struct proc *p, struct mqueue_notifier *nt)
1924 {
1925  LIST_REMOVE(nt, nt_link);
1926  notifier_free(nt);
1927 }
1928 
1929 static void
1930 notifier_remove(struct proc *p, struct mqueue *mq, int fd)
1931 {
1932  struct mqueue_notifier *nt;
1933 
1934  mtx_assert(&mq->mq_mutex, MA_OWNED);
1935  PROC_LOCK(p);
1936  nt = notifier_search(p, fd);
1937  if (nt != NULL) {
1938  if (mq->mq_notifier == nt)
1939  mq->mq_notifier = NULL;
1940  sigqueue_take(&nt->nt_ksi);
1941  notifier_delete(p, nt);
1942  }
1943  PROC_UNLOCK(p);
1944 }
1945 
1946 static int
1947 kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
1948  const struct mq_attr *attr)
1949 {
1950  char path[MQFS_NAMELEN + 1];
1951  struct mqfs_node *pn;
1952  struct filedesc *fdp;
1953  struct file *fp;
1954  struct mqueue *mq;
1955  int fd, error, len, cmode;
1956 
1957  fdp = td->td_proc->p_fd;
1958  cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
1959  mq = NULL;
1960  if ((flags & O_CREAT) != 0 && attr != NULL) {
1961  if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
1962  return (EINVAL);
1963  if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
1964  return (EINVAL);
1965  }
1966 
1967  error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
1968  if (error)
1969  return (error);
1970 
1971  /*
1972  * The first character of name must be a slash (/) character
1973  * and the remaining characters of name cannot include any slash
1974  * characters.
1975  */
1976  len = strlen(path);
1977  if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
1978  return (EINVAL);
1979 
1980  error = falloc(td, &fp, &fd, O_CLOEXEC);
1981  if (error)
1982  return (error);
1983 
1984  sx_xlock(&mqfs_data.mi_lock);
1985  pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
1986  if (pn == NULL) {
1987  if (!(flags & O_CREAT)) {
1988  error = ENOENT;
1989  } else {
1990  mq = mqueue_alloc(attr);
1991  if (mq == NULL) {
1992  error = ENFILE;
1993  } else {
1994  pn = mqfs_create_file(mqfs_data.mi_root,
1995  path + 1, len - 1, td->td_ucred,
1996  cmode);
1997  if (pn == NULL) {
1998  error = ENOSPC;
1999  mqueue_free(mq);
2000  }
2001  }
2002  }
2003 
2004  if (error == 0) {
2005  pn->mn_data = mq;
2006  }
2007  } else {
2008  if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
2009  error = EEXIST;
2010  } else {
2011  accmode_t accmode = 0;
2012 
2013  if (flags & FREAD)
2014  accmode |= VREAD;
2015  if (flags & FWRITE)
2016  accmode |= VWRITE;
2017  error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
2018  pn->mn_gid, accmode, td->td_ucred, NULL);
2019  }
2020  }
2021 
2022  if (error) {
2023  sx_xunlock(&mqfs_data.mi_lock);
2024  fdclose(fdp, fp, fd, td);
2025  fdrop(fp, td);
2026  return (error);
2027  }
2028 
2029  mqnode_addref(pn);
2030  sx_xunlock(&mqfs_data.mi_lock);
2031 
2032  finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
2033  &mqueueops);
2034 
2035  td->td_retval[0] = fd;
2036  fdrop(fp, td);
2037  return (0);
2038 }
2039 
2040 /*
2041  * Syscall to open a message queue.
2042  */
2043 int
2044 sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
2045 {
2046  struct mq_attr attr;
2047  int flags, error;
2048 
2049  if ((uap->flags & O_ACCMODE) == O_ACCMODE)
2050  return (EINVAL);
2051  flags = FFLAGS(uap->flags);
2052  if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2053  error = copyin(uap->attr, &attr, sizeof(attr));
2054  if (error)
2055  return (error);
2056  }
2057  return (kern_kmq_open(td, uap->path, flags, uap->mode,
2058  uap->attr != NULL ? &attr : NULL));
2059 }
2060 
2061 /*
2062  * Syscall to unlink a message queue.
2063  */
2064 int
2065 sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
2066 {
2067  char path[MQFS_NAMELEN+1];
2068  struct mqfs_node *pn;
2069  int error, len;
2070 
2071  error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
2072  if (error)
2073  return (error);
2074 
2075  len = strlen(path);
2076  if (len < 2 || path[0] != '/' || index(path + 1, '/') != NULL)
2077  return (EINVAL);
2078 
2079  sx_xlock(&mqfs_data.mi_lock);
2080  pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1);
2081  if (pn != NULL)
2082  error = do_unlink(pn, td->td_ucred);
2083  else
2084  error = ENOENT;
2085  sx_xunlock(&mqfs_data.mi_lock);
2086  return (error);
2087 }
2088 
2089 typedef int (*_fgetf)(struct thread *, int, cap_rights_t, struct file **);
2090 
2091 /*
2092  * Get message queue by giving file slot
2093  */
2094 static int
2095 _getmq(struct thread *td, int fd, cap_rights_t rights, _fgetf func,
2096  struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
2097 {
2098  struct mqfs_node *pn;
2099  int error;
2100 
2101  error = func(td, fd, rights, fpp);
2102  if (error)
2103  return (error);
2104  if (&mqueueops != (*fpp)->f_ops) {
2105  fdrop(*fpp, td);
2106  return (EBADF);
2107  }
2108  pn = (*fpp)->f_data;
2109  if (ppn)
2110  *ppn = pn;
2111  if (pmq)
2112  *pmq = pn->mn_data;
2113  return (0);
2114 }
2115 
2116 static __inline int
2117 getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
2118  struct mqueue **pmq)
2119 {
2120  return _getmq(td, fd, CAP_POLL_EVENT, fget, fpp, ppn, pmq);
2121 }
2122 
2123 static __inline int
2124 getmq_read(struct thread *td, int fd, struct file **fpp,
2125  struct mqfs_node **ppn, struct mqueue **pmq)
2126 {
2127  return _getmq(td, fd, CAP_READ, fget_read, fpp, ppn, pmq);
2128 }
2129 
2130 static __inline int
2131 getmq_write(struct thread *td, int fd, struct file **fpp,
2132  struct mqfs_node **ppn, struct mqueue **pmq)
2133 {
2134  return _getmq(td, fd, CAP_WRITE, fget_write, fpp, ppn, pmq);
2135 }
2136 
2137 static int
2138 kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
2139  struct mq_attr *oattr)
2140 {
2141  struct mqueue *mq;
2142  struct file *fp;
2143  u_int oflag, flag;
2144  int error;
2145 
2146  if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
2147  return (EINVAL);
2148  error = getmq(td, mqd, &fp, NULL, &mq);
2149  if (error)
2150  return (error);
2151  oattr->mq_maxmsg = mq->mq_maxmsg;
2152  oattr->mq_msgsize = mq->mq_msgsize;
2153  oattr->mq_curmsgs = mq->mq_curmsgs;
2154  if (attr != NULL) {
2155  do {
2156  oflag = flag = fp->f_flag;
2157  flag &= ~O_NONBLOCK;
2158  flag |= (attr->mq_flags & O_NONBLOCK);
2159  } while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
2160  } else
2161  oflag = fp->f_flag;
2162  oattr->mq_flags = (O_NONBLOCK & oflag);
2163  fdrop(fp, td);
2164  return (error);
2165 }
2166 
2167 int
2168 sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
2169 {
2170  struct mq_attr attr, oattr;
2171  int error;
2172 
2173  if (uap->attr != NULL) {
2174  error = copyin(uap->attr, &attr, sizeof(attr));
2175  if (error != 0)
2176  return (error);
2177  }
2178  error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2179  &oattr);
2180  if (error != 0)
2181  return (error);
2182  if (uap->oattr != NULL)
2183  error = copyout(&oattr, uap->oattr, sizeof(oattr));
2184  return (error);
2185 }
2186 
2187 int
2188 sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
2189 {
2190  struct mqueue *mq;
2191  struct file *fp;
2192  struct timespec *abs_timeout, ets;
2193  int error;
2194  int waitok;
2195 
2196  error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2197  if (error)
2198  return (error);
2199  if (uap->abs_timeout != NULL) {
2200  error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2201  if (error != 0)
2202  return (error);
2203  abs_timeout = &ets;
2204  } else
2205  abs_timeout = NULL;
2206  waitok = !(fp->f_flag & O_NONBLOCK);
2207  error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2208  uap->msg_prio, waitok, abs_timeout);
2209  fdrop(fp, td);
2210  return (error);
2211 }
2212 
2213 int
2214 sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
2215 {
2216  struct mqueue *mq;
2217  struct file *fp;
2218  struct timespec *abs_timeout, ets;
2219  int error, waitok;
2220 
2221  error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2222  if (error)
2223  return (error);
2224  if (uap->abs_timeout != NULL) {
2225  error = copyin(uap->abs_timeout, &ets, sizeof(ets));
2226  if (error != 0)
2227  return (error);
2228  abs_timeout = &ets;
2229  } else
2230  abs_timeout = NULL;
2231  waitok = !(fp->f_flag & O_NONBLOCK);
2232  error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2233  uap->msg_prio, waitok, abs_timeout);
2234  fdrop(fp, td);
2235  return (error);
2236 }
2237 
2238 static int
2239 kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
2240 {
2241  struct filedesc *fdp;
2242  struct proc *p;
2243  struct mqueue *mq;
2244  struct file *fp, *fp2;
2245  struct mqueue_notifier *nt, *newnt = NULL;
2246  int error;
2247 
2248  if (sigev != NULL) {
2249  if (sigev->sigev_notify != SIGEV_SIGNAL &&
2250  sigev->sigev_notify != SIGEV_THREAD_ID &&
2251  sigev->sigev_notify != SIGEV_NONE)
2252  return (EINVAL);
2253  if ((sigev->sigev_notify == SIGEV_SIGNAL ||
2254  sigev->sigev_notify == SIGEV_THREAD_ID) &&
2255  !_SIG_VALID(sigev->sigev_signo))
2256  return (EINVAL);
2257  }
2258  p = td->td_proc;
2259  fdp = td->td_proc->p_fd;
2260  error = getmq(td, mqd, &fp, NULL, &mq);
2261  if (error)
2262  return (error);
2263 again:
2264  FILEDESC_SLOCK(fdp);
2265  fp2 = fget_locked(fdp, mqd);
2266  if (fp2 == NULL) {
2267  FILEDESC_SUNLOCK(fdp);
2268  error = EBADF;
2269  goto out;
2270  }
2271  error = cap_funwrap(fp2, CAP_POLL_EVENT, &fp2);
2272  if (error) {
2273  FILEDESC_SUNLOCK(fdp);
2274  goto out;
2275  }
2276  if (fp2 != fp) {
2277  FILEDESC_SUNLOCK(fdp);
2278  error = EBADF;
2279  goto out;
2280  }
2281  mtx_lock(&mq->mq_mutex);
2282  FILEDESC_SUNLOCK(fdp);
2283  if (sigev != NULL) {
2284  if (mq->mq_notifier != NULL) {
2285  error = EBUSY;
2286  } else {
2287  PROC_LOCK(p);
2288  nt = notifier_search(p, mqd);
2289  if (nt == NULL) {
2290  if (newnt == NULL) {
2291  PROC_UNLOCK(p);
2292  mtx_unlock(&mq->mq_mutex);
2293  newnt = notifier_alloc();
2294  goto again;
2295  }
2296  }
2297 
2298  if (nt != NULL) {
2299  sigqueue_take(&nt->nt_ksi);
2300  if (newnt != NULL) {
2301  notifier_free(newnt);
2302  newnt = NULL;
2303  }
2304  } else {
2305  nt = newnt;
2306  newnt = NULL;
2307  ksiginfo_init(&nt->nt_ksi);
2308  nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
2309  nt->nt_ksi.ksi_code = SI_MESGQ;
2310  nt->nt_proc = p;
2311  nt->nt_ksi.ksi_mqd = mqd;
2312  notifier_insert(p, nt);
2313  }
2314  nt->nt_sigev = *sigev;
2315  mq->mq_notifier = nt;
2316  PROC_UNLOCK(p);
2317  /*
2318  * if there is no receivers and message queue
2319  * is not empty, we should send notification
2320  * as soon as possible.
2321  */
2322  if (mq->mq_receivers == 0 &&
2323  !TAILQ_EMPTY(&mq->mq_msgq))
2324  mqueue_send_notification(mq);
2325  }
2326  } else {
2327  notifier_remove(p, mq, mqd);
2328  }
2329  mtx_unlock(&mq->mq_mutex);
2330 
2331 out:
2332  fdrop(fp, td);
2333  if (newnt != NULL)
2334  notifier_free(newnt);
2335  return (error);
2336 }
2337 
2338 int
2339 sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
2340 {
2341  struct sigevent ev, *evp;
2342  int error;
2343 
2344  if (uap->sigev == NULL) {
2345  evp = NULL;
2346  } else {
2347  error = copyin(uap->sigev, &ev, sizeof(ev));
2348  if (error != 0)
2349  return (error);
2350  evp = &ev;
2351  }
2352  return (kern_kmq_notify(td, uap->mqd, evp));
2353 }
2354 
2355 static void
2356 mqueue_fdclose(struct thread *td, int fd, struct file *fp)
2357 {
2358  struct filedesc *fdp;
2359  struct mqueue *mq;
2360 
2361  fdp = td->td_proc->p_fd;
2362  FILEDESC_LOCK_ASSERT(fdp);
2363 
2364  if (fp->f_ops == &mqueueops) {
2365  mq = FPTOMQ(fp);
2366  mtx_lock(&mq->mq_mutex);
2367  notifier_remove(td->td_proc, mq, fd);
2368 
2369  /* have to wakeup thread in same process */
2370  if (mq->mq_flags & MQ_RSEL) {
2371  mq->mq_flags &= ~MQ_RSEL;
2372  selwakeup(&mq->mq_rsel);
2373  }
2374  if (mq->mq_flags & MQ_WSEL) {
2375  mq->mq_flags &= ~MQ_WSEL;
2376  selwakeup(&mq->mq_wsel);
2377  }
2378  mtx_unlock(&mq->mq_mutex);
2379  }
2380 }
2381 
2382 static void
2383 mq_proc_exit(void *arg __unused, struct proc *p)
2384 {
2385  struct filedesc *fdp;
2386  struct file *fp;
2387  struct mqueue *mq;
2388  int i;
2389 
2390  fdp = p->p_fd;
2391  FILEDESC_SLOCK(fdp);
2392  for (i = 0; i < fdp->fd_nfiles; ++i) {
2393  fp = fget_locked(fdp, i);
2394  if (fp != NULL && fp->f_ops == &mqueueops) {
2395  mq = FPTOMQ(fp);
2396  mtx_lock(&mq->mq_mutex);
2397  notifier_remove(p, FPTOMQ(fp), i);
2398  mtx_unlock(&mq->mq_mutex);
2399  }
2400  }
2401  FILEDESC_SUNLOCK(fdp);
2402  KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
2403 }
2404 
2405 static int
2406 mqf_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
2407  int flags, struct thread *td)
2408 {
2409  return (EOPNOTSUPP);
2410 }
2411 
2412 static int
2413 mqf_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
2414  int flags, struct thread *td)
2415 {
2416  return (EOPNOTSUPP);
2417 }
2418 
2419 static int
2420 mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred,
2421  struct thread *td)
2422 {
2423 
2424  return (EINVAL);
2425 }
2426 
2427 static int
2428 mqf_ioctl(struct file *fp, u_long cmd, void *data,
2429  struct ucred *active_cred, struct thread *td)
2430 {
2431  return (ENOTTY);
2432 }
2433 
2434 static int
2435 mqf_poll(struct file *fp, int events, struct ucred *active_cred,
2436  struct thread *td)
2437 {
2438  struct mqueue *mq = FPTOMQ(fp);
2439  int revents = 0;
2440 
2441  mtx_lock(&mq->mq_mutex);
2442  if (events & (POLLIN | POLLRDNORM)) {
2443  if (mq->mq_curmsgs) {
2444  revents |= events & (POLLIN | POLLRDNORM);
2445  } else {
2446  mq->mq_flags |= MQ_RSEL;
2447  selrecord(td, &mq->mq_rsel);
2448  }
2449  }
2450  if (events & POLLOUT) {
2451  if (mq->mq_curmsgs < mq->mq_maxmsg)
2452  revents |= POLLOUT;
2453  else {
2454  mq->mq_flags |= MQ_WSEL;
2455  selrecord(td, &mq->mq_wsel);
2456  }
2457  }
2458  mtx_unlock(&mq->mq_mutex);
2459  return (revents);
2460 }
2461 
2462 static int
2463 mqf_close(struct file *fp, struct thread *td)
2464 {
2465  struct mqfs_node *pn;
2466 
2467  fp->f_ops = &badfileops;
2468  pn = fp->f_data;
2469  fp->f_data = NULL;
2470  sx_xlock(&mqfs_data.mi_lock);
2471  mqnode_release(pn);
2472  sx_xunlock(&mqfs_data.mi_lock);
2473  return (0);
2474 }
2475 
2476 static int
2477 mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
2478  struct thread *td)
2479 {
2480  struct mqfs_node *pn = fp->f_data;
2481 
2482  bzero(st, sizeof *st);
2483  sx_xlock(&mqfs_data.mi_lock);
2484  st->st_atim = pn->mn_atime;
2485  st->st_mtim = pn->mn_mtime;
2486  st->st_ctim = pn->mn_ctime;
2487  st->st_birthtim = pn->mn_birth;
2488  st->st_uid = pn->mn_uid;
2489  st->st_gid = pn->mn_gid;
2490  st->st_mode = S_IFIFO | pn->mn_mode;
2491  sx_xunlock(&mqfs_data.mi_lock);
2492  return (0);
2493 }
2494 
2495 static int
2496 mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2497  struct thread *td)
2498 {
2499  struct mqfs_node *pn;
2500  int error;
2501 
2502  error = 0;
2503  pn = fp->f_data;
2504  sx_xlock(&mqfs_data.mi_lock);
2505  error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
2506  active_cred, NULL);
2507  if (error != 0)
2508  goto out;
2509  pn->mn_mode = mode & ACCESSPERMS;
2510 out:
2511  sx_xunlock(&mqfs_data.mi_lock);
2512  return (error);
2513 }
2514 
2515 static int
2516 mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2517  struct thread *td)
2518 {
2519  struct mqfs_node *pn;
2520  int error;
2521 
2522  error = 0;
2523  pn = fp->f_data;
2524  sx_xlock(&mqfs_data.mi_lock);
2525  if (uid == (uid_t)-1)
2526  uid = pn->mn_uid;
2527  if (gid == (gid_t)-1)
2528  gid = pn->mn_gid;
2529  if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
2530  (gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
2531  (error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
2532  goto out;
2533  pn->mn_uid = uid;
2534  pn->mn_gid = gid;
2535 out:
2536  sx_xunlock(&mqfs_data.mi_lock);
2537  return (error);
2538 }
2539 
2540 static int
2541 mqf_kqfilter(struct file *fp, struct knote *kn)
2542 {
2543  struct mqueue *mq = FPTOMQ(fp);
2544  int error = 0;
2545 
2546  if (kn->kn_filter == EVFILT_READ) {
2547  kn->kn_fop = &mq_rfiltops;
2548  knlist_add(&mq->mq_rsel.si_note, kn, 0);
2549  } else if (kn->kn_filter == EVFILT_WRITE) {
2550  kn->kn_fop = &mq_wfiltops;
2551  knlist_add(&mq->mq_wsel.si_note, kn, 0);
2552  } else
2553  error = EINVAL;
2554  return (error);
2555 }
2556 
2557 static void
2558 filt_mqdetach(struct knote *kn)
2559 {
2560  struct mqueue *mq = FPTOMQ(kn->kn_fp);
2561 
2562  if (kn->kn_filter == EVFILT_READ)
2563  knlist_remove(&mq->mq_rsel.si_note, kn, 0);
2564  else if (kn->kn_filter == EVFILT_WRITE)
2565  knlist_remove(&mq->mq_wsel.si_note, kn, 0);
2566  else
2567  panic("filt_mqdetach");
2568 }
2569 
2570 static int
2571 filt_mqread(struct knote *kn, long hint)
2572 {
2573  struct mqueue *mq = FPTOMQ(kn->kn_fp);
2574 
2575  mtx_assert(&mq->mq_mutex, MA_OWNED);
2576  return (mq->mq_curmsgs != 0);
2577 }
2578 
2579 static int
2580 filt_mqwrite(struct knote *kn, long hint)
2581 {
2582  struct mqueue *mq = FPTOMQ(kn->kn_fp);
2583 
2584  mtx_assert(&mq->mq_mutex, MA_OWNED);
2585  return (mq->mq_curmsgs < mq->mq_maxmsg);
2586 }
2587 
2588 static struct fileops mqueueops = {
2589  .fo_read = mqf_read,
2590  .fo_write = mqf_write,
2591  .fo_truncate = mqf_truncate,
2592  .fo_ioctl = mqf_ioctl,
2593  .fo_poll = mqf_poll,
2594  .fo_kqfilter = mqf_kqfilter,
2595  .fo_stat = mqf_stat,
2596  .fo_chmod = mqf_chmod,
2597  .fo_chown = mqf_chown,
2598  .fo_close = mqf_close
2599 };
2600 
2601 static struct vop_vector mqfs_vnodeops = {
2602  .vop_default = &default_vnodeops,
2603  .vop_access = mqfs_access,
2604  .vop_cachedlookup = mqfs_lookup,
2605  .vop_lookup = vfs_cache_lookup,
2606  .vop_reclaim = mqfs_reclaim,
2607  .vop_create = mqfs_create,
2608  .vop_remove = mqfs_remove,
2609  .vop_inactive = mqfs_inactive,
2610  .vop_open = mqfs_open,
2611  .vop_close = mqfs_close,
2612  .vop_getattr = mqfs_getattr,
2613  .vop_setattr = mqfs_setattr,
2614  .vop_read = mqfs_read,
2615  .vop_write = VOP_EOPNOTSUPP,
2616  .vop_readdir = mqfs_readdir,
2617  .vop_mkdir = VOP_EOPNOTSUPP,
2618  .vop_rmdir = VOP_EOPNOTSUPP
2619 };
2620 
2621 static struct vfsops mqfs_vfsops = {
2622  .vfs_init = mqfs_init,
2623  .vfs_uninit = mqfs_uninit,
2624  .vfs_mount = mqfs_mount,
2625  .vfs_unmount = mqfs_unmount,
2626  .vfs_root = mqfs_root,
2627  .vfs_statfs = mqfs_statfs,
2628 };
2629 
2630 static struct vfsconf mqueuefs_vfsconf = {
2631  .vfc_version = VFS_VERSION,
2632  .vfc_name = "mqueuefs",
2633  .vfc_vfsops = &mqfs_vfsops,
2634  .vfc_typenum = -1,
2635  .vfc_flags = VFCF_SYNTHETIC
2636 };
2637 
2638 static struct syscall_helper_data mq_syscalls[] = {
2639  SYSCALL_INIT_HELPER(kmq_open),
2640  SYSCALL_INIT_HELPER(kmq_setattr),
2641  SYSCALL_INIT_HELPER(kmq_timedsend),
2642  SYSCALL_INIT_HELPER(kmq_timedreceive),
2643  SYSCALL_INIT_HELPER(kmq_notify),
2644  SYSCALL_INIT_HELPER(kmq_unlink),
2645  SYSCALL_INIT_LAST
2646 };
2647 
2648 #ifdef COMPAT_32BIT
2649 #include <compat/compat32bit/compat32bit.h>
2650 #include <compat/compat32bit/compat32bit_proto.h>
2651 #include <compat/compat32bit/compat32bit_signal.h>
2652 #include <compat/compat32bit/compat32bit_syscall.h>
2653 #include <compat/compat32bit/compat32bit_util.h>
2654 
2655 static void
2656 mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
2657 {
2658 
2659  to->mq_flags = from->mq_flags;
2660  to->mq_maxmsg = from->mq_maxmsg;
2661  to->mq_msgsize = from->mq_msgsize;
2662  to->mq_curmsgs = from->mq_curmsgs;
2663 }
2664 
2665 static void
2666 mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
2667 {
2668 
2669  to->mq_flags = from->mq_flags;
2670  to->mq_maxmsg = from->mq_maxmsg;
2671  to->mq_msgsize = from->mq_msgsize;
2672  to->mq_curmsgs = from->mq_curmsgs;
2673 }
2674 
2675 int
2676 compat32bit_kmq_open(struct thread *td, struct compat32bit_kmq_open_args *uap)
2677 {
2678  struct mq_attr attr;
2679  struct mq_attr32 attr32;
2680  int flags, error;
2681 
2682  if ((uap->flags & O_ACCMODE) == O_ACCMODE)
2683  return (EINVAL);
2684  flags = FFLAGS(uap->flags);
2685  if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
2686  error = copyin(uap->attr, &attr32, sizeof(attr32));
2687  if (error)
2688  return (error);
2689  mq_attr_from32(&attr32, &attr);
2690  }
2691  return (kern_kmq_open(td, uap->path, flags, uap->mode,
2692  uap->attr != NULL ? &attr : NULL));
2693 }
2694 
2695 int
2696 compat32bit_kmq_setattr(struct thread *td, struct compat32bit_kmq_setattr_args *uap)
2697 {
2698  struct mq_attr attr, oattr;
2699  struct mq_attr32 attr32, oattr32;
2700  int error;
2701 
2702  if (uap->attr != NULL) {
2703  error = copyin(uap->attr, &attr32, sizeof(attr32));
2704  if (error != 0)
2705  return (error);
2706  mq_attr_from32(&attr32, &attr);
2707  }
2708  error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
2709  &oattr);
2710  if (error != 0)
2711  return (error);
2712  if (uap->oattr != NULL) {
2713  mq_attr_to32(&oattr, &oattr32);
2714  error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
2715  }
2716  return (error);
2717 }
2718 
2719 int
2720 compat32bit_kmq_timedsend(struct thread *td,
2721  struct compat32bit_kmq_timedsend_args *uap)
2722 {
2723  struct mqueue *mq;
2724  struct file *fp;
2725  struct timespec32 ets32;
2726  struct timespec *abs_timeout, ets;
2727  int error;
2728  int waitok;
2729 
2730  error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
2731  if (error)
2732  return (error);
2733  if (uap->abs_timeout != NULL) {
2734  error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2735  if (error != 0)
2736  return (error);
2737  CP(ets32, ets, tv_sec);
2738  CP(ets32, ets, tv_nsec);
2739  abs_timeout = &ets;
2740  } else
2741  abs_timeout = NULL;
2742  waitok = !(fp->f_flag & O_NONBLOCK);
2743  error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
2744  uap->msg_prio, waitok, abs_timeout);
2745  fdrop(fp, td);
2746  return (error);
2747 }
2748 
2749 int
2750 compat32bit_kmq_timedreceive(struct thread *td,
2751  struct compat32bit_kmq_timedreceive_args *uap)
2752 {
2753  struct mqueue *mq;
2754  struct file *fp;
2755  struct timespec32 ets32;
2756  struct timespec *abs_timeout, ets;
2757  int error, waitok;
2758 
2759  error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
2760  if (error)
2761  return (error);
2762  if (uap->abs_timeout != NULL) {
2763  error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
2764  if (error != 0)
2765  return (error);
2766  CP(ets32, ets, tv_sec);
2767  CP(ets32, ets, tv_nsec);
2768  abs_timeout = &ets;
2769  } else
2770  abs_timeout = NULL;
2771  waitok = !(fp->f_flag & O_NONBLOCK);
2772  error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
2773  uap->msg_prio, waitok, abs_timeout);
2774  fdrop(fp, td);
2775  return (error);
2776 }
2777 
2778 int
2779 compat32bit_kmq_notify(struct thread *td, struct compat32bit_kmq_notify_args *uap)
2780 {
2781  struct sigevent ev, *evp;
2782  struct sigevent32 ev32;
2783  int error;
2784 
2785  if (uap->sigev == NULL) {
2786  evp = NULL;
2787  } else {
2788  error = copyin(uap->sigev, &ev32, sizeof(ev32));
2789  if (error != 0)
2790  return (error);
2791  error = convert_sigevent32(&ev32, &ev);
2792  if (error != 0)
2793  return (error);
2794  evp = &ev;
2795  }
2796  return (kern_kmq_notify(td, uap->mqd, evp));
2797 }
2798 
2799 static struct syscall_helper_data mq32_syscalls[] = {
2800  SYSCALL32_INIT_HELPER(compat32bit_kmq_open),
2801  SYSCALL32_INIT_HELPER(compat32bit_kmq_setattr),
2802  SYSCALL32_INIT_HELPER(compat32bit_kmq_timedsend),
2803  SYSCALL32_INIT_HELPER(compat32bit_kmq_timedreceive),
2804  SYSCALL32_INIT_HELPER(compat32bit_kmq_notify),
2805  SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink),
2806  SYSCALL_INIT_LAST
2807 };
2808 #endif
2809 
2810 static int
2811 mqinit(void)
2812 {
2813  int error;
2814 
2815  error = syscall_helper_register(mq_syscalls);
2816  if (error != 0)
2817  return (error);
2818 #ifdef COMPAT_32BIT
2819  error = syscall32_helper_register(mq32_syscalls);
2820  if (error != 0)
2821  return (error);
2822 #endif
2823  return (0);
2824 }
2825 
2826 static int
2827 mqunload(void)
2828 {
2829 
2830 #ifdef COMPAT_32BIT
2831  syscall32_helper_unregister(mq32_syscalls);
2832 #endif
2833  syscall_helper_unregister(mq_syscalls);
2834  return (0);
2835 }
2836 
2837 static int
2838 mq_modload(struct module *module, int cmd, void *arg)
2839 {
2840  int error = 0;
2841 
2842  error = vfs_modevent(module, cmd, arg);
2843  if (error != 0)
2844  return (error);
2845 
2846  switch (cmd) {
2847  case MOD_LOAD:
2848  error = mqinit();
2849  if (error != 0)
2850  mqunload();
2851  break;
2852  case MOD_UNLOAD:
2853  error = mqunload();
2854  break;
2855  default:
2856  break;
2857  }
2858  return (error);
2859 }
2860 
2861 static moduledata_t mqueuefs_mod = {
2862  "mqueuefs",
2863  mq_modload,
2864  &mqueuefs_vfsconf
2865 };
2866 DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
2867 MODULE_VERSION(mqueuefs, 1);
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Definition: uipc_mqueue.c:111
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static int mqfs_destroy(struct mqfs_node *mn)
Definition: uipc_mqueue.c:542
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Definition: uipc_mqueue.c:1601
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int sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
Definition: uipc_mqueue.c:2188
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static struct mqfs_node * mqfs_search(struct mqfs_node *pd, const char *name, int len)
Definition: uipc_mqueue.c:802
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Definition: uipc_mqueue.c:2580
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Definition: kern_sig.c:1994
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Definition: uipc_mqueue.c:632
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static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
Definition: uipc_mqueue.c:1854
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#define VFSTOMQFS(m)
Definition: uipc_mqueue.c:149
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Definition: kern_event.c:1866
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Definition: vfs_init.c:322
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Definition: subr_unit.c:325
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static struct vfsops mqfs_vfsops
Definition: uipc_mqueue.c:2621
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Definition: uipc_mqueue.c:2214
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static int default_maxmsg
Definition: uipc_mqueue.c:192
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static int mqfs_fixup_dir(struct mqfs_node *parent)
Definition: uipc_mqueue.c:469
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static int mqfs_create(struct vop_create_args *ap)
Definition: uipc_mqueue.c:958
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static int maxmsg
Definition: uipc_mqueue.c:195
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Definition: uipc_mqueue.c:157
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Definition: uipc_mqueue.c:679
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Definition: kern_descrip.c:2129
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Definition: vfs_subr.c:1051
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static int mqf_poll(struct file *fp, int events, struct ucred *active_cred, struct thread *td)
Definition: uipc_mqueue.c:2435
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static __inline struct mqfs_node * mqnode_alloc(void)
Definition: uipc_mqueue.c:367
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static int mqfs_readdir(struct vop_readdir_args *ap)
Definition: uipc_mqueue.c:1357
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Definition: kern_tc.c:282
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Definition: vfs_cache.c:1436
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Definition: uipc_mqueue.c:182
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static int kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr, struct mq_attr *oattr)
Definition: uipc_mqueue.c:2138
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static struct syscall_helper_data mq_syscalls[]
Definition: uipc_mqueue.c:2638
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static struct mqfs_node * mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode, int nodetype)
Definition: uipc_mqueue.c:430
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SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,&maxmsg, 0,"Default maximum messages in queue")
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Definition: kern_prot.c:1267
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static MALLOC_DEFINE(M_MQUEUEDATA,"mqdata","mqueue data")
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static uma_zone_t mqueue_zone
Definition: uipc_mqueue.c:215
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static void mqueue_free(struct mqueue *mq)
Definition: uipc_mqueue.c:1555
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static void do_recycle(void *context, int pending __unused)
Definition: uipc_mqueue.c:702
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Definition: vfs_subr.c:2656
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Definition: kern_malloc.c:554
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#define VTOMQ(vp)
Definition: uipc_mqueue.c:148
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int taskqueue_enqueue(struct taskqueue *queue, struct task *task)
Definition: subr_taskqueue.c:210
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static int mqfs_open(struct vop_open_args *ap)
Definition: uipc_mqueue.c:1111
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static int kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
Definition: uipc_mqueue.c:2239
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struct mqfs_info * mn_info
Definition: uipc_mqueue.c:128
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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:452
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void finit(struct file *fp, u_int flag, short type, void *data, struct fileops *ops)
Definition: kern_descrip.c:2321
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DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
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void vhold(struct vnode *vp)
Definition: vfs_subr.c:2448
__FBSDID
__FBSDID("$BSDSUniX$")
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static int mqfs_getattr(struct vop_getattr_args *ap)
Definition: uipc_mqueue.c:1173
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void mtx_init(struct mtx *m, const char *name, const char *type, int opts)
Definition: kern_mutex.c:837
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int insmntque(struct vnode *vp, struct mount *mp)
Definition: vfs_subr.c:1253
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int sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
Definition: uipc_mqueue.c:2044
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static int mqf_truncate(struct file *fp, off_t length, struct ucred *active_cred, struct thread *td)
Definition: uipc_mqueue.c:2420
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static int mqfs_inactive(struct vop_inactive_args *ap)
Definition: uipc_mqueue.c:1063
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int fget_read(struct thread *td, int fd, cap_rights_t rights, struct file **fpp)
Definition: kern_descrip.c:2501
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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:2117
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static int mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred, struct thread *td)
Definition: uipc_mqueue.c:2477
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Definition: uipc_mqueue.c:98
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int tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
Definition: kern_sig.c:2029
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void vgone(struct vnode *vp)
Definition: vfs_subr.c:2799
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Definition: uipc_mqueue.c:96
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static __inline int getmq_read(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
Definition: uipc_mqueue.c:2124
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static __inline int getmq_write(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
Definition: uipc_mqueue.c:2131
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struct msgq mq_msgq
Definition: uipc_mqueue.c:171
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#define VTON(vp)
Definition: uipc_mqueue.c:147
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int fget_write(struct thread *td, int fd, cap_rights_t rights, struct file **fpp)
Definition: kern_descrip.c:2508
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void delete_unrhdr(struct unrhdr *uh)
Definition: subr_unit.c:347
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int vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off)
Definition: vfs_subr.c:4665
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static int mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
Definition: uipc_mqueue.c:618
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int mq_receivers
Definition: uipc_mqueue.c:172
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void mtx_destroy(struct mtx *m)
Definition: kern_mutex.c:884
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struct filterops mq_wfiltops
Definition: uipc_mqueue.c:269
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#define MQ_RSEL
Definition: uipc_mqueue.c:179
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struct mtx mq_mutex
Definition: uipc_mqueue.c:165
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long mq_totalbytes
Definition: uipc_mqueue.c:170
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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:1947
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void free_unr(struct unrhdr *uh, u_int item)
Definition: subr_unit.c:872
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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:1783
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void knlist_init_mtx(struct knlist *knl, struct mtx *lock)
Definition: kern_event.c:1995
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int sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
Definition: uipc_mqueue.c:2168
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struct mqfs_node * mi_root
Definition: uipc_mqueue.c:112
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static struct fileops mqueueops
Definition: uipc_mqueue.c:219
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struct unrhdr * mi_unrhdr
Definition: uipc_mqueue.c:113
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#define FPTOMQ(fp)
Definition: uipc_mqueue.c:150
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int flag
Definition: vfs_syscalls.c:2159
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static __inline void notifier_free(struct mqueue_notifier *p)
Definition: uipc_mqueue.c:1899
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MODULE_VERSION(mqueuefs, 1)
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struct mqueue_notifier * mq_notifier
Definition: uipc_mqueue.c:176
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void sx_destroy(struct sx *sx)
Definition: kern_sx.c:234
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#define MQ_WSEL
Definition: uipc_mqueue.c:180
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struct fileops badfileops
Definition: kern_descrip.c:4004