blob: 9b7c8ab7d75cad27e92272c0a0c81927c9fbaa03 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * POSIX message queues filesystem for Linux.
3 *
4 * Copyright (C) 2003,2004 Krzysztof Benedyczak (golbi@mat.uni.torun.pl)
Michal Wronskif66e9282006-10-03 23:23:27 +02005 * Michal Wronski (michal.wronski@gmail.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Spinlocks: Mohamed Abbas (abbas.mohamed@intel.com)
8 * Lockless receive & send, fd based notify:
9 * Manfred Spraul (manfred@colorfullife.com)
10 *
George C. Wilson20ca73b2006-05-24 16:09:55 -050011 * Audit: George Wilson (ltcgcw@us.ibm.com)
12 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * This file is released under the GPL.
14 */
15
Randy.Dunlapc59ede72006-01-11 12:17:46 -080016#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/init.h>
18#include <linux/pagemap.h>
19#include <linux/file.h>
20#include <linux/mount.h>
21#include <linux/namei.h>
22#include <linux/sysctl.h>
23#include <linux/poll.h>
24#include <linux/mqueue.h>
25#include <linux/msg.h>
26#include <linux/skbuff.h>
27#include <linux/netlink.h>
28#include <linux/syscalls.h>
George C. Wilson20ca73b2006-05-24 16:09:55 -050029#include <linux/audit.h>
Jesper Juhl7ed20e12005-05-01 08:59:14 -070030#include <linux/signal.h>
Ingo Molnar5f921ae2006-03-26 01:37:17 -080031#include <linux/mutex.h>
Pavel Emelyanovb4888932007-10-18 23:40:14 -070032#include <linux/nsproxy.h>
33#include <linux/pid.h>
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070034#include <linux/ipc_namespace.h>
Serge E. Hallyn6b550f92012-01-10 15:11:37 -080035#include <linux/user_namespace.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Ingo Molnar5f921ae2006-03-26 01:37:17 -080037
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <net/sock.h>
39#include "util.h"
40
41#define MQUEUE_MAGIC 0x19800202
42#define DIRENT_SIZE 20
43#define FILENT_SIZE 80
44
45#define SEND 0
46#define RECV 1
47
48#define STATE_NONE 0
49#define STATE_PENDING 1
50#define STATE_READY 2
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052struct ext_wait_queue { /* queue of sleeping tasks */
53 struct task_struct *task;
54 struct list_head list;
55 struct msg_msg *msg; /* ptr of loaded message */
56 int state; /* one of STATE_* values */
57};
58
59struct mqueue_inode_info {
60 spinlock_t lock;
61 struct inode vfs_inode;
62 wait_queue_head_t wait_q;
63
64 struct msg_msg **messages;
65 struct mq_attr attr;
66
67 struct sigevent notify;
Cedric Le Goatera03fcb72006-10-02 02:17:26 -070068 struct pid* notify_owner;
Adrian Bunk338cec32005-09-10 00:26:54 -070069 struct user_struct *user; /* user who created, for accounting */
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 struct sock *notify_sock;
71 struct sk_buff *notify_cookie;
72
73 /* for tasks waiting for free space and messages, respectively */
74 struct ext_wait_queue e_wait_q[2];
75
76 unsigned long qsize; /* size of queue in memory (sum of all msgs) */
77};
78
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080079static const struct inode_operations mqueue_dir_inode_operations;
Arjan van de Ven9a321442007-02-12 00:55:35 -080080static const struct file_operations mqueue_file_operations;
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070081static const struct super_operations mqueue_super_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082static void remove_notification(struct mqueue_inode_info *info);
83
Christoph Lametere18b8902006-12-06 20:33:20 -080084static struct kmem_cache *mqueue_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86static struct ctl_table_header * mq_sysctl_table;
87
88static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode)
89{
90 return container_of(inode, struct mqueue_inode_info, vfs_inode);
91}
92
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070093/*
94 * This routine should be called with the mq_lock held.
95 */
96static inline struct ipc_namespace *__get_ns_from_inode(struct inode *inode)
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070097{
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070098 return get_ipc_ns(inode->i_sb->s_fs_info);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070099}
100
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700101static struct ipc_namespace *get_ns_from_inode(struct inode *inode)
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700102{
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700103 struct ipc_namespace *ns;
104
105 spin_lock(&mq_lock);
106 ns = __get_ns_from_inode(inode);
107 spin_unlock(&mq_lock);
108 return ns;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700109}
110
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700111static struct inode *mqueue_get_inode(struct super_block *sb,
Al Viro1b9d5ff2011-07-24 14:18:20 -0400112 struct ipc_namespace *ipc_ns, umode_t mode,
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700113 struct mq_attr *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
David Howells86a264a2008-11-14 10:39:18 +1100115 struct user_struct *u = current_user();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 struct inode *inode;
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700117 int ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 inode = new_inode(sb);
Jiri Slaby04715202011-07-26 16:08:46 -0700120 if (!inode)
121 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Jiri Slaby04715202011-07-26 16:08:46 -0700123 inode->i_ino = get_next_ino();
124 inode->i_mode = mode;
125 inode->i_uid = current_fsuid();
126 inode->i_gid = current_fsgid();
127 inode->i_mtime = inode->i_ctime = inode->i_atime = CURRENT_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Jiri Slaby04715202011-07-26 16:08:46 -0700129 if (S_ISREG(mode)) {
130 struct mqueue_inode_info *info;
131 struct task_struct *p = current;
132 unsigned long mq_bytes, mq_msg_tblsz;
André Goddard Rosac8308b12010-02-23 04:04:23 -0300133
Jiri Slaby04715202011-07-26 16:08:46 -0700134 inode->i_fop = &mqueue_file_operations;
135 inode->i_size = FILENT_SIZE;
136 /* mqueue specific info */
137 info = MQUEUE_I(inode);
138 spin_lock_init(&info->lock);
139 init_waitqueue_head(&info->wait_q);
140 INIT_LIST_HEAD(&info->e_wait_q[0].list);
141 INIT_LIST_HEAD(&info->e_wait_q[1].list);
142 info->notify_owner = NULL;
143 info->qsize = 0;
144 info->user = NULL; /* set when all is ok */
145 memset(&info->attr, 0, sizeof(info->attr));
146 info->attr.mq_maxmsg = ipc_ns->mq_msg_max;
147 info->attr.mq_msgsize = ipc_ns->mq_msgsize_max;
148 if (attr) {
149 info->attr.mq_maxmsg = attr->mq_maxmsg;
150 info->attr.mq_msgsize = attr->mq_msgsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
Jiri Slaby04715202011-07-26 16:08:46 -0700152 mq_msg_tblsz = info->attr.mq_maxmsg * sizeof(struct msg_msg *);
153 info->messages = kmalloc(mq_msg_tblsz, GFP_KERNEL);
154 if (!info->messages)
155 goto out_inode;
156
157 mq_bytes = (mq_msg_tblsz +
158 (info->attr.mq_maxmsg * info->attr.mq_msgsize));
159
160 spin_lock(&mq_lock);
161 if (u->mq_bytes + mq_bytes < u->mq_bytes ||
162 u->mq_bytes + mq_bytes > task_rlimit(p, RLIMIT_MSGQUEUE)) {
163 spin_unlock(&mq_lock);
164 /* mqueue_evict_inode() releases info->messages */
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700165 ret = -EMFILE;
Jiri Slaby04715202011-07-26 16:08:46 -0700166 goto out_inode;
167 }
168 u->mq_bytes += mq_bytes;
169 spin_unlock(&mq_lock);
170
171 /* all is ok */
172 info->user = get_uid(u);
173 } else if (S_ISDIR(mode)) {
174 inc_nlink(inode);
175 /* Some things misbehave if size == 0 on a directory */
176 inode->i_size = 2 * DIRENT_SIZE;
177 inode->i_op = &mqueue_dir_inode_operations;
178 inode->i_fop = &simple_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
Jiri Slaby04715202011-07-26 16:08:46 -0700180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return inode;
182out_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 iput(inode);
Jiri Slaby04715202011-07-26 16:08:46 -0700184err:
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700185 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
188static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
189{
190 struct inode *inode;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700191 struct ipc_namespace *ns = data;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300192 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 sb->s_blocksize = PAGE_CACHE_SIZE;
195 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
196 sb->s_magic = MQUEUE_MAGIC;
197 sb->s_op = &mqueue_super_ops;
198
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700199 inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO,
200 NULL);
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700201 if (IS_ERR(inode)) {
202 error = PTR_ERR(inode);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700203 goto out;
204 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 sb->s_root = d_alloc_root(inode);
207 if (!sb->s_root) {
208 iput(inode);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700209 error = -ENOMEM;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300210 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300212 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700214out:
215 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Al Viroceefda62010-07-26 13:16:50 +0400218static struct dentry *mqueue_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -0700219 int flags, const char *dev_name,
Al Viroceefda62010-07-26 13:16:50 +0400220 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700222 if (!(flags & MS_KERNMOUNT))
223 data = current->nsproxy->ipc_ns;
Al Viroceefda62010-07-26 13:16:50 +0400224 return mount_ns(fs_type, flags, data, mqueue_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700227static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
229 struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo;
230
Christoph Lametera35afb82007-05-16 22:10:57 -0700231 inode_init_once(&p->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
234static struct inode *mqueue_alloc_inode(struct super_block *sb)
235{
236 struct mqueue_inode_info *ei;
237
Christoph Lametere94b1762006-12-06 20:33:17 -0800238 ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if (!ei)
240 return NULL;
241 return &ei->vfs_inode;
242}
243
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100244static void mqueue_i_callback(struct rcu_head *head)
245{
246 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100247 kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode));
248}
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250static void mqueue_destroy_inode(struct inode *inode)
251{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100252 call_rcu(&inode->i_rcu, mqueue_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
Al Viro6d8af642010-06-05 16:29:45 -0400255static void mqueue_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
257 struct mqueue_inode_info *info;
258 struct user_struct *user;
259 unsigned long mq_bytes;
260 int i;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700261 struct ipc_namespace *ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Al Viro6d8af642010-06-05 16:29:45 -0400263 end_writeback(inode);
264
265 if (S_ISDIR(inode->i_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return;
Al Viro6d8af642010-06-05 16:29:45 -0400267
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700268 ipc_ns = get_ns_from_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 info = MQUEUE_I(inode);
270 spin_lock(&info->lock);
271 for (i = 0; i < info->attr.mq_curmsgs; i++)
272 free_msg(info->messages[i]);
273 kfree(info->messages);
274 spin_unlock(&info->lock);
275
André Goddard Rosa8834cf72010-02-23 04:04:24 -0300276 /* Total amount of bytes accounted for the mqueue */
277 mq_bytes = info->attr.mq_maxmsg * (sizeof(struct msg_msg *)
278 + info->attr.mq_msgsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 user = info->user;
280 if (user) {
281 spin_lock(&mq_lock);
282 user->mq_bytes -= mq_bytes;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700283 /*
284 * get_ns_from_inode() ensures that the
285 * (ipc_ns = sb->s_fs_info) is either a valid ipc_ns
286 * to which we now hold a reference, or it is NULL.
287 * We can't put it here under mq_lock, though.
288 */
289 if (ipc_ns)
290 ipc_ns->mq_queues_count--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 spin_unlock(&mq_lock);
292 free_uid(user);
293 }
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700294 if (ipc_ns)
295 put_ipc_ns(ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298static int mqueue_create(struct inode *dir, struct dentry *dentry,
Al Viro4acdaf22011-07-26 01:42:34 -0400299 umode_t mode, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 struct inode *inode;
302 struct mq_attr *attr = dentry->d_fsdata;
303 int error;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700304 struct ipc_namespace *ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
306 spin_lock(&mq_lock);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700307 ipc_ns = __get_ns_from_inode(dir);
308 if (!ipc_ns) {
309 error = -EACCES;
310 goto out_unlock;
311 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700312 if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max &&
313 !capable(CAP_SYS_RESOURCE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 error = -ENOSPC;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700315 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700317 ipc_ns->mq_queues_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 spin_unlock(&mq_lock);
319
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700320 inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr);
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700321 if (IS_ERR(inode)) {
322 error = PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 spin_lock(&mq_lock);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700324 ipc_ns->mq_queues_count--;
325 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700328 put_ipc_ns(ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 dir->i_size += DIRENT_SIZE;
330 dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
331
332 d_instantiate(dentry, inode);
333 dget(dentry);
334 return 0;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700335out_unlock:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 spin_unlock(&mq_lock);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700337 if (ipc_ns)
338 put_ipc_ns(ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 return error;
340}
341
342static int mqueue_unlink(struct inode *dir, struct dentry *dentry)
343{
344 struct inode *inode = dentry->d_inode;
345
346 dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
347 dir->i_size -= DIRENT_SIZE;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700348 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 dput(dentry);
350 return 0;
351}
352
353/*
354* This is routine for system read from queue file.
355* To avoid mess with doing here some sort of mq_receive we allow
356* to read only queue size & notification info (the only values
357* that are interesting from user point of view and aren't accessible
358* through std routines)
359*/
360static ssize_t mqueue_read_file(struct file *filp, char __user *u_data,
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700361 size_t count, loff_t *off)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Josef Sipek6d630792006-12-08 02:37:11 -0800363 struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 char buffer[FILENT_SIZE];
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700365 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 spin_lock(&info->lock);
368 snprintf(buffer, sizeof(buffer),
369 "QSIZE:%-10lu NOTIFY:%-5d SIGNO:%-5d NOTIFY_PID:%-6d\n",
370 info->qsize,
371 info->notify_owner ? info->notify.sigev_notify : 0,
372 (info->notify_owner &&
373 info->notify.sigev_notify == SIGEV_SIGNAL) ?
374 info->notify.sigev_signo : 0,
Pavel Emelyanov6c5f3e72008-02-08 04:19:20 -0800375 pid_vnr(info->notify_owner));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 spin_unlock(&info->lock);
377 buffer[sizeof(buffer)-1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700379 ret = simple_read_from_buffer(u_data, count, off, buffer,
380 strlen(buffer));
381 if (ret <= 0)
382 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Josef Sipek6d630792006-12-08 02:37:11 -0800384 filp->f_path.dentry->d_inode->i_atime = filp->f_path.dentry->d_inode->i_ctime = CURRENT_TIME;
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700385 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386}
387
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700388static int mqueue_flush_file(struct file *filp, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Josef Sipek6d630792006-12-08 02:37:11 -0800390 struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 spin_lock(&info->lock);
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700393 if (task_tgid(current) == info->notify_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 remove_notification(info);
395
396 spin_unlock(&info->lock);
397 return 0;
398}
399
400static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab)
401{
Josef Sipek6d630792006-12-08 02:37:11 -0800402 struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 int retval = 0;
404
405 poll_wait(filp, &info->wait_q, poll_tab);
406
407 spin_lock(&info->lock);
408 if (info->attr.mq_curmsgs)
409 retval = POLLIN | POLLRDNORM;
410
411 if (info->attr.mq_curmsgs < info->attr.mq_maxmsg)
412 retval |= POLLOUT | POLLWRNORM;
413 spin_unlock(&info->lock);
414
415 return retval;
416}
417
418/* Adds current to info->e_wait_q[sr] before element with smaller prio */
419static void wq_add(struct mqueue_inode_info *info, int sr,
420 struct ext_wait_queue *ewp)
421{
422 struct ext_wait_queue *walk;
423
424 ewp->task = current;
425
426 list_for_each_entry(walk, &info->e_wait_q[sr].list, list) {
427 if (walk->task->static_prio <= current->static_prio) {
428 list_add_tail(&ewp->list, &walk->list);
429 return;
430 }
431 }
432 list_add_tail(&ewp->list, &info->e_wait_q[sr].list);
433}
434
435/*
436 * Puts current task to sleep. Caller must hold queue lock. After return
437 * lock isn't held.
438 * sr: SEND or RECV
439 */
440static int wq_sleep(struct mqueue_inode_info *info, int sr,
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200441 ktime_t *timeout, struct ext_wait_queue *ewp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 int retval;
444 signed long time;
445
446 wq_add(info, sr, ewp);
447
448 for (;;) {
449 set_current_state(TASK_INTERRUPTIBLE);
450
451 spin_unlock(&info->lock);
Wanlong Gao32ea8452011-10-31 17:06:35 -0700452 time = schedule_hrtimeout_range_clock(timeout, 0,
453 HRTIMER_MODE_ABS, CLOCK_REALTIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 while (ewp->state == STATE_PENDING)
456 cpu_relax();
457
458 if (ewp->state == STATE_READY) {
459 retval = 0;
460 goto out;
461 }
462 spin_lock(&info->lock);
463 if (ewp->state == STATE_READY) {
464 retval = 0;
465 goto out_unlock;
466 }
467 if (signal_pending(current)) {
468 retval = -ERESTARTSYS;
469 break;
470 }
471 if (time == 0) {
472 retval = -ETIMEDOUT;
473 break;
474 }
475 }
476 list_del(&ewp->list);
477out_unlock:
478 spin_unlock(&info->lock);
479out:
480 return retval;
481}
482
483/*
484 * Returns waiting task that should be serviced first or NULL if none exists
485 */
486static struct ext_wait_queue *wq_get_first_waiter(
487 struct mqueue_inode_info *info, int sr)
488{
489 struct list_head *ptr;
490
491 ptr = info->e_wait_q[sr].list.prev;
492 if (ptr == &info->e_wait_q[sr].list)
493 return NULL;
494 return list_entry(ptr, struct ext_wait_queue, list);
495}
496
497/* Auxiliary functions to manipulate messages' list */
498static void msg_insert(struct msg_msg *ptr, struct mqueue_inode_info *info)
499{
500 int k;
501
502 k = info->attr.mq_curmsgs - 1;
503 while (k >= 0 && info->messages[k]->m_type >= ptr->m_type) {
504 info->messages[k + 1] = info->messages[k];
505 k--;
506 }
507 info->attr.mq_curmsgs++;
508 info->qsize += ptr->m_ts;
509 info->messages[k + 1] = ptr;
510}
511
512static inline struct msg_msg *msg_get(struct mqueue_inode_info *info)
513{
514 info->qsize -= info->messages[--info->attr.mq_curmsgs]->m_ts;
515 return info->messages[info->attr.mq_curmsgs];
516}
517
518static inline void set_cookie(struct sk_buff *skb, char code)
519{
520 ((char*)skb->data)[NOTIFY_COOKIE_LEN-1] = code;
521}
522
523/*
524 * The next function is only to split too long sys_mq_timedsend
525 */
526static void __do_notify(struct mqueue_inode_info *info)
527{
528 /* notification
529 * invoked when there is registered process and there isn't process
530 * waiting synchronously for message AND state of queue changed from
531 * empty to not empty. Here we are sure that no one is waiting
532 * synchronously. */
533 if (info->notify_owner &&
534 info->attr.mq_curmsgs == 1) {
535 struct siginfo sig_i;
536 switch (info->notify.sigev_notify) {
537 case SIGEV_NONE:
538 break;
539 case SIGEV_SIGNAL:
540 /* sends signal */
541
542 sig_i.si_signo = info->notify.sigev_signo;
543 sig_i.si_errno = 0;
544 sig_i.si_code = SI_MESGQ;
545 sig_i.si_value = info->notify.sigev_value;
Serge E. Hallyn6b550f92012-01-10 15:11:37 -0800546 /* map current pid/uid into info->owner's namespaces */
547 rcu_read_lock();
Sukadev Bhattiprolua6684992009-01-07 18:08:50 -0800548 sig_i.si_pid = task_tgid_nr_ns(current,
549 ns_of_pid(info->notify_owner));
Serge E. Hallyn6b550f92012-01-10 15:11:37 -0800550 sig_i.si_uid = user_ns_map_uid(info->user->user_ns,
551 current_cred(), current_uid());
552 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700554 kill_pid_info(info->notify.sigev_signo,
555 &sig_i, info->notify_owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 break;
557 case SIGEV_THREAD:
558 set_cookie(info->notify_cookie, NOTIFY_WOKENUP);
Denis V. Lunev7ee015e2007-10-10 21:14:03 -0700559 netlink_sendskb(info->notify_sock, info->notify_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 break;
561 }
562 /* after notification unregisters process */
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700563 put_pid(info->notify_owner);
564 info->notify_owner = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
566 wake_up(&info->wait_q);
567}
568
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200569static int prepare_timeout(const struct timespec __user *u_abs_timeout,
570 ktime_t *expires, struct timespec *ts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200572 if (copy_from_user(ts, u_abs_timeout, sizeof(struct timespec)))
573 return -EFAULT;
574 if (!timespec_valid(ts))
575 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200577 *expires = timespec_to_ktime(*ts);
578 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579}
580
581static void remove_notification(struct mqueue_inode_info *info)
582{
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700583 if (info->notify_owner != NULL &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 info->notify.sigev_notify == SIGEV_THREAD) {
585 set_cookie(info->notify_cookie, NOTIFY_REMOVED);
Denis V. Lunev7ee015e2007-10-10 21:14:03 -0700586 netlink_sendskb(info->notify_sock, info->notify_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 }
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700588 put_pid(info->notify_owner);
589 info->notify_owner = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590}
591
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700592static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
594 if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0)
595 return 0;
596 if (capable(CAP_SYS_RESOURCE)) {
597 if (attr->mq_maxmsg > HARD_MSGMAX)
598 return 0;
599 } else {
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700600 if (attr->mq_maxmsg > ipc_ns->mq_msg_max ||
601 attr->mq_msgsize > ipc_ns->mq_msgsize_max)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 return 0;
603 }
604 /* check for overflow */
605 if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg)
606 return 0;
André Goddard Rosa8834cf72010-02-23 04:04:24 -0300607 if ((unsigned long)(attr->mq_maxmsg * (attr->mq_msgsize
608 + sizeof (struct msg_msg *))) <
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 (unsigned long)(attr->mq_maxmsg * attr->mq_msgsize))
610 return 0;
611 return 1;
612}
613
614/*
615 * Invoked when creating a new queue via sys_mq_open
616 */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700617static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir,
Al Viro4acdaf22011-07-26 01:42:34 -0400618 struct dentry *dentry, int oflag, umode_t mode,
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700619 struct mq_attr *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620{
David Howells745ca242008-11-14 10:39:22 +1100621 const struct cred *cred = current_cred();
Dave Hansen4a3fd212008-02-15 14:37:48 -0800622 struct file *result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 int ret;
624
Al Viro564f6992008-12-14 04:02:26 -0500625 if (attr) {
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300626 if (!mq_attr_ok(ipc_ns, attr)) {
627 ret = -EINVAL;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500628 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300629 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 /* store for use during create */
Al Viro564f6992008-12-14 04:02:26 -0500631 dentry->d_fsdata = attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 }
633
Al Viroce3b0f82009-03-29 19:08:22 -0400634 mode &= ~current_umask();
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700635 ret = mnt_want_write(ipc_ns->mq_mnt);
Dave Hansen4a3fd212008-02-15 14:37:48 -0800636 if (ret)
637 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 ret = vfs_create(dir->d_inode, dentry, mode, NULL);
639 dentry->d_fsdata = NULL;
640 if (ret)
Dave Hansen4a3fd212008-02-15 14:37:48 -0800641 goto out_drop_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700643 result = dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
Dave Hansen4a3fd212008-02-15 14:37:48 -0800644 /*
645 * dentry_open() took a persistent mnt_want_write(),
646 * so we can now drop this one.
647 */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700648 mnt_drop_write(ipc_ns->mq_mnt);
Dave Hansen4a3fd212008-02-15 14:37:48 -0800649 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Dave Hansen4a3fd212008-02-15 14:37:48 -0800651out_drop_write:
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700652 mnt_drop_write(ipc_ns->mq_mnt);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500653out:
654 dput(dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700655 mntput(ipc_ns->mq_mnt);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500656 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657}
658
659/* Opens existing queue */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700660static struct file *do_open(struct ipc_namespace *ipc_ns,
661 struct dentry *dentry, int oflag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300663 int ret;
David Howells745ca242008-11-14 10:39:22 +1100664 const struct cred *cred = current_cred();
665
666 static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
667 MAY_READ | MAY_WRITE };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Alexander Viro7c7dce92006-01-14 15:29:55 -0500669 if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300670 ret = -EINVAL;
671 goto err;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500672 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673
Al Virof419a2e2008-07-22 00:07:17 -0400674 if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) {
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300675 ret = -EACCES;
676 goto err;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500677 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700679 return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300680
681err:
682 dput(dentry);
683 mntput(ipc_ns->mq_mnt);
684 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685}
686
Al Virodf0a4282011-07-26 05:26:10 -0400687SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
Heiko Carstensd5460c92009-01-14 14:14:27 +0100688 struct mq_attr __user *, u_attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
690 struct dentry *dentry;
691 struct file *filp;
692 char *name;
Al Viro564f6992008-12-14 04:02:26 -0500693 struct mq_attr attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 int fd, error;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700695 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Al Viro564f6992008-12-14 04:02:26 -0500697 if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr)))
698 return -EFAULT;
699
700 audit_mq_open(oflag, mode, u_attr ? &attr : NULL);
George C. Wilson20ca73b2006-05-24 16:09:55 -0500701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (IS_ERR(name = getname(u_name)))
703 return PTR_ERR(name);
704
Ulrich Drepper269f2132008-05-03 15:28:45 -0400705 fd = get_unused_fd_flags(O_CLOEXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 if (fd < 0)
707 goto out_putname;
708
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700709 mutex_lock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
710 dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 if (IS_ERR(dentry)) {
712 error = PTR_ERR(dentry);
André Goddard Rosa4294a8e2010-02-23 04:04:28 -0300713 goto out_putfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700715 mntget(ipc_ns->mq_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
717 if (oflag & O_CREAT) {
718 if (dentry->d_inode) { /* entry already exists */
Al Viro5a190ae2007-06-07 12:19:32 -0400719 audit_inode(name, dentry);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300720 if (oflag & O_EXCL) {
721 error = -EEXIST;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500722 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300723 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700724 filp = do_open(ipc_ns, dentry, oflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 } else {
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700726 filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root,
727 dentry, oflag, mode,
Al Viro564f6992008-12-14 04:02:26 -0500728 u_attr ? &attr : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 }
Alexander Viro7c7dce92006-01-14 15:29:55 -0500730 } else {
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300731 if (!dentry->d_inode) {
732 error = -ENOENT;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500733 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300734 }
Al Viro5a190ae2007-06-07 12:19:32 -0400735 audit_inode(name, dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700736 filp = do_open(ipc_ns, dentry, oflag);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500737 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 if (IS_ERR(filp)) {
740 error = PTR_ERR(filp);
741 goto out_putfd;
742 }
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 fd_install(fd, filp);
745 goto out_upsem;
746
Alexander Viro7c7dce92006-01-14 15:29:55 -0500747out:
748 dput(dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700749 mntput(ipc_ns->mq_mnt);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500750out_putfd:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 put_unused_fd(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 fd = error;
753out_upsem:
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700754 mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755out_putname:
756 putname(name);
757 return fd;
758}
759
Heiko Carstensd5460c92009-01-14 14:14:27 +0100760SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 int err;
763 char *name;
764 struct dentry *dentry;
765 struct inode *inode = NULL;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700766 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 name = getname(u_name);
769 if (IS_ERR(name))
770 return PTR_ERR(name);
771
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700772 mutex_lock_nested(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex,
Peter Zijlstra7a434812007-03-06 01:42:09 -0800773 I_MUTEX_PARENT);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700774 dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 if (IS_ERR(dentry)) {
776 err = PTR_ERR(dentry);
777 goto out_unlock;
778 }
779
780 if (!dentry->d_inode) {
781 err = -ENOENT;
782 goto out_err;
783 }
784
785 inode = dentry->d_inode;
786 if (inode)
Al Viro7de9c6e2010-10-23 11:11:40 -0400787 ihold(inode);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700788 err = mnt_want_write(ipc_ns->mq_mnt);
Dave Hansen06227532008-02-15 14:37:34 -0800789 if (err)
790 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 err = vfs_unlink(dentry->d_parent->d_inode, dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700792 mnt_drop_write(ipc_ns->mq_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793out_err:
794 dput(dentry);
795
796out_unlock:
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700797 mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 putname(name);
799 if (inode)
800 iput(inode);
801
802 return err;
803}
804
805/* Pipelined send and receive functions.
806 *
807 * If a receiver finds no waiting message, then it registers itself in the
808 * list of waiting receivers. A sender checks that list before adding the new
809 * message into the message array. If there is a waiting receiver, then it
810 * bypasses the message array and directly hands the message over to the
811 * receiver.
812 * The receiver accepts the message and returns without grabbing the queue
813 * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers
814 * are necessary. The same algorithm is used for sysv semaphores, see
Serge E. Hallyn7b7a3172006-03-28 01:56:23 -0800815 * ipc/sem.c for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 *
817 * The same algorithm is used for senders.
818 */
819
820/* pipelined_send() - send a message directly to the task waiting in
821 * sys_mq_timedreceive() (without inserting message into a queue).
822 */
823static inline void pipelined_send(struct mqueue_inode_info *info,
824 struct msg_msg *message,
825 struct ext_wait_queue *receiver)
826{
827 receiver->msg = message;
828 list_del(&receiver->list);
829 receiver->state = STATE_PENDING;
830 wake_up_process(receiver->task);
akpm@osdl.orgd59dd462005-05-01 08:58:47 -0700831 smp_wmb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 receiver->state = STATE_READY;
833}
834
835/* pipelined_receive() - if there is task waiting in sys_mq_timedsend()
836 * gets its message and put to the queue (we have one free place for sure). */
837static inline void pipelined_receive(struct mqueue_inode_info *info)
838{
839 struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND);
840
841 if (!sender) {
842 /* for poll */
843 wake_up_interruptible(&info->wait_q);
844 return;
845 }
846 msg_insert(sender->msg, info);
847 list_del(&sender->list);
848 sender->state = STATE_PENDING;
849 wake_up_process(sender->task);
akpm@osdl.orgd59dd462005-05-01 08:58:47 -0700850 smp_wmb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 sender->state = STATE_READY;
852}
853
Heiko Carstensc4ea37c2009-01-14 14:14:28 +0100854SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
855 size_t, msg_len, unsigned int, msg_prio,
856 const struct timespec __user *, u_abs_timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857{
858 struct file *filp;
859 struct inode *inode;
860 struct ext_wait_queue wait;
861 struct ext_wait_queue *receiver;
862 struct msg_msg *msg_ptr;
863 struct mqueue_inode_info *info;
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200864 ktime_t expires, *timeout = NULL;
865 struct timespec ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 int ret;
867
Al Viroc32c8af2008-12-14 03:46:48 -0500868 if (u_abs_timeout) {
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200869 int res = prepare_timeout(u_abs_timeout, &expires, &ts);
870 if (res)
871 return res;
872 timeout = &expires;
Al Viroc32c8af2008-12-14 03:46:48 -0500873 }
George C. Wilson20ca73b2006-05-24 16:09:55 -0500874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX))
876 return -EINVAL;
877
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200878 audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300881 if (unlikely(!filp)) {
882 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
Josef Sipek6d630792006-12-08 02:37:11 -0800886 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300887 if (unlikely(filp->f_op != &mqueue_file_operations)) {
888 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300890 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 info = MQUEUE_I(inode);
Al Viro5a190ae2007-06-07 12:19:32 -0400892 audit_inode(NULL, filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300894 if (unlikely(!(filp->f_mode & FMODE_WRITE))) {
895 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300897 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 if (unlikely(msg_len > info->attr.mq_msgsize)) {
900 ret = -EMSGSIZE;
901 goto out_fput;
902 }
903
904 /* First try to allocate memory, before doing anything with
905 * existing queues. */
906 msg_ptr = load_msg(u_msg_ptr, msg_len);
907 if (IS_ERR(msg_ptr)) {
908 ret = PTR_ERR(msg_ptr);
909 goto out_fput;
910 }
911 msg_ptr->m_ts = msg_len;
912 msg_ptr->m_type = msg_prio;
913
914 spin_lock(&info->lock);
915
916 if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) {
917 if (filp->f_flags & O_NONBLOCK) {
918 spin_unlock(&info->lock);
919 ret = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 } else {
921 wait.task = current;
922 wait.msg = (void *) msg_ptr;
923 wait.state = STATE_NONE;
924 ret = wq_sleep(info, SEND, timeout, &wait);
925 }
926 if (ret < 0)
927 free_msg(msg_ptr);
928 } else {
929 receiver = wq_get_first_waiter(info, RECV);
930 if (receiver) {
931 pipelined_send(info, msg_ptr, receiver);
932 } else {
933 /* adds message to the queue */
934 msg_insert(msg_ptr, info);
935 __do_notify(info);
936 }
937 inode->i_atime = inode->i_mtime = inode->i_ctime =
938 CURRENT_TIME;
939 spin_unlock(&info->lock);
940 ret = 0;
941 }
942out_fput:
943 fput(filp);
944out:
945 return ret;
946}
947
Heiko Carstensc4ea37c2009-01-14 14:14:28 +0100948SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
949 size_t, msg_len, unsigned int __user *, u_msg_prio,
950 const struct timespec __user *, u_abs_timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 ssize_t ret;
953 struct msg_msg *msg_ptr;
954 struct file *filp;
955 struct inode *inode;
956 struct mqueue_inode_info *info;
957 struct ext_wait_queue wait;
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200958 ktime_t expires, *timeout = NULL;
959 struct timespec ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960
Al Viroc32c8af2008-12-14 03:46:48 -0500961 if (u_abs_timeout) {
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200962 int res = prepare_timeout(u_abs_timeout, &expires, &ts);
963 if (res)
964 return res;
965 timeout = &expires;
Al Viroc32c8af2008-12-14 03:46:48 -0500966 }
George C. Wilson20ca73b2006-05-24 16:09:55 -0500967
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200968 audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300971 if (unlikely(!filp)) {
972 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300974 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
Josef Sipek6d630792006-12-08 02:37:11 -0800976 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300977 if (unlikely(filp->f_op != &mqueue_file_operations)) {
978 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300980 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 info = MQUEUE_I(inode);
Al Viro5a190ae2007-06-07 12:19:32 -0400982 audit_inode(NULL, filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300984 if (unlikely(!(filp->f_mode & FMODE_READ))) {
985 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989 /* checks if buffer is big enough */
990 if (unlikely(msg_len < info->attr.mq_msgsize)) {
991 ret = -EMSGSIZE;
992 goto out_fput;
993 }
994
995 spin_lock(&info->lock);
996 if (info->attr.mq_curmsgs == 0) {
997 if (filp->f_flags & O_NONBLOCK) {
998 spin_unlock(&info->lock);
999 ret = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 } else {
1001 wait.task = current;
1002 wait.state = STATE_NONE;
1003 ret = wq_sleep(info, RECV, timeout, &wait);
1004 msg_ptr = wait.msg;
1005 }
1006 } else {
1007 msg_ptr = msg_get(info);
1008
1009 inode->i_atime = inode->i_mtime = inode->i_ctime =
1010 CURRENT_TIME;
1011
1012 /* There is now free space in queue. */
1013 pipelined_receive(info);
1014 spin_unlock(&info->lock);
1015 ret = 0;
1016 }
1017 if (ret == 0) {
1018 ret = msg_ptr->m_ts;
1019
1020 if ((u_msg_prio && put_user(msg_ptr->m_type, u_msg_prio)) ||
1021 store_msg(u_msg_ptr, msg_ptr, msg_ptr->m_ts)) {
1022 ret = -EFAULT;
1023 }
1024 free_msg(msg_ptr);
1025 }
1026out_fput:
1027 fput(filp);
1028out:
1029 return ret;
1030}
1031
1032/*
1033 * Notes: the case when user wants us to deregister (with NULL as pointer)
1034 * and he isn't currently owner of notification, will be silently discarded.
1035 * It isn't explicitly defined in the POSIX.
1036 */
Heiko Carstensc4ea37c2009-01-14 14:14:28 +01001037SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,
1038 const struct sigevent __user *, u_notification)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
1040 int ret;
1041 struct file *filp;
1042 struct sock *sock;
1043 struct inode *inode;
1044 struct sigevent notification;
1045 struct mqueue_inode_info *info;
1046 struct sk_buff *nc;
1047
Al Viro20114f72008-12-10 07:16:12 -05001048 if (u_notification) {
1049 if (copy_from_user(&notification, u_notification,
1050 sizeof(struct sigevent)))
1051 return -EFAULT;
1052 }
1053
1054 audit_mq_notify(mqdes, u_notification ? &notification : NULL);
George C. Wilson20ca73b2006-05-24 16:09:55 -05001055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 nc = NULL;
1057 sock = NULL;
1058 if (u_notification != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 if (unlikely(notification.sigev_notify != SIGEV_NONE &&
1060 notification.sigev_notify != SIGEV_SIGNAL &&
1061 notification.sigev_notify != SIGEV_THREAD))
1062 return -EINVAL;
1063 if (notification.sigev_notify == SIGEV_SIGNAL &&
Jesper Juhl7ed20e12005-05-01 08:59:14 -07001064 !valid_signal(notification.sigev_signo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 return -EINVAL;
1066 }
1067 if (notification.sigev_notify == SIGEV_THREAD) {
Patrick McHardyc3d8d1e2007-11-07 02:42:09 -08001068 long timeo;
1069
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 /* create the notify skb */
1071 nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001072 if (!nc) {
1073 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001075 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 if (copy_from_user(nc->data,
1077 notification.sigev_value.sival_ptr,
1078 NOTIFY_COOKIE_LEN)) {
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001079 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 goto out;
1081 }
1082
1083 /* TODO: add a header? */
1084 skb_put(nc, NOTIFY_COOKIE_LEN);
1085 /* and attach it to the socket */
1086retry:
1087 filp = fget(notification.sigev_signo);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001088 if (!filp) {
1089 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001091 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 sock = netlink_getsockbyfilp(filp);
1093 fput(filp);
1094 if (IS_ERR(sock)) {
1095 ret = PTR_ERR(sock);
1096 sock = NULL;
1097 goto out;
1098 }
1099
Patrick McHardyc3d8d1e2007-11-07 02:42:09 -08001100 timeo = MAX_SCHEDULE_TIMEOUT;
Denis V. Lunev9457afe2008-06-05 11:23:39 -07001101 ret = netlink_attachskb(sock, nc, &timeo, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 if (ret == 1)
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001103 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 if (ret) {
1105 sock = NULL;
1106 nc = NULL;
1107 goto out;
1108 }
1109 }
1110 }
1111
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001113 if (!filp) {
1114 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001116 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Josef Sipek6d630792006-12-08 02:37:11 -08001118 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001119 if (unlikely(filp->f_op != &mqueue_file_operations)) {
1120 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001122 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 info = MQUEUE_I(inode);
1124
1125 ret = 0;
1126 spin_lock(&info->lock);
1127 if (u_notification == NULL) {
Cedric Le Goatera03fcb72006-10-02 02:17:26 -07001128 if (info->notify_owner == task_tgid(current)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 remove_notification(info);
1130 inode->i_atime = inode->i_ctime = CURRENT_TIME;
1131 }
Cedric Le Goatera03fcb72006-10-02 02:17:26 -07001132 } else if (info->notify_owner != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 ret = -EBUSY;
1134 } else {
1135 switch (notification.sigev_notify) {
1136 case SIGEV_NONE:
1137 info->notify.sigev_notify = SIGEV_NONE;
1138 break;
1139 case SIGEV_THREAD:
1140 info->notify_sock = sock;
1141 info->notify_cookie = nc;
1142 sock = NULL;
1143 nc = NULL;
1144 info->notify.sigev_notify = SIGEV_THREAD;
1145 break;
1146 case SIGEV_SIGNAL:
1147 info->notify.sigev_signo = notification.sigev_signo;
1148 info->notify.sigev_value = notification.sigev_value;
1149 info->notify.sigev_notify = SIGEV_SIGNAL;
1150 break;
1151 }
Cedric Le Goatera03fcb72006-10-02 02:17:26 -07001152
1153 info->notify_owner = get_pid(task_tgid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 inode->i_atime = inode->i_ctime = CURRENT_TIME;
1155 }
1156 spin_unlock(&info->lock);
1157out_fput:
1158 fput(filp);
1159out:
1160 if (sock) {
1161 netlink_detachskb(sock, nc);
1162 } else if (nc) {
1163 dev_kfree_skb(nc);
1164 }
1165 return ret;
1166}
1167
Heiko Carstensc4ea37c2009-01-14 14:14:28 +01001168SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
1169 const struct mq_attr __user *, u_mqstat,
1170 struct mq_attr __user *, u_omqstat)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171{
1172 int ret;
1173 struct mq_attr mqstat, omqstat;
1174 struct file *filp;
1175 struct inode *inode;
1176 struct mqueue_inode_info *info;
1177
1178 if (u_mqstat != NULL) {
1179 if (copy_from_user(&mqstat, u_mqstat, sizeof(struct mq_attr)))
1180 return -EFAULT;
1181 if (mqstat.mq_flags & (~O_NONBLOCK))
1182 return -EINVAL;
1183 }
1184
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001186 if (!filp) {
1187 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001189 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
Josef Sipek6d630792006-12-08 02:37:11 -08001191 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001192 if (unlikely(filp->f_op != &mqueue_file_operations)) {
1193 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001195 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 info = MQUEUE_I(inode);
1197
1198 spin_lock(&info->lock);
1199
1200 omqstat = info->attr;
1201 omqstat.mq_flags = filp->f_flags & O_NONBLOCK;
1202 if (u_mqstat) {
Al Viro73929062008-12-10 06:58:59 -05001203 audit_mq_getsetattr(mqdes, &mqstat);
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -07001204 spin_lock(&filp->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 if (mqstat.mq_flags & O_NONBLOCK)
1206 filp->f_flags |= O_NONBLOCK;
1207 else
1208 filp->f_flags &= ~O_NONBLOCK;
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -07001209 spin_unlock(&filp->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210
1211 inode->i_atime = inode->i_ctime = CURRENT_TIME;
1212 }
1213
1214 spin_unlock(&info->lock);
1215
1216 ret = 0;
1217 if (u_omqstat != NULL && copy_to_user(u_omqstat, &omqstat,
1218 sizeof(struct mq_attr)))
1219 ret = -EFAULT;
1220
1221out_fput:
1222 fput(filp);
1223out:
1224 return ret;
1225}
1226
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08001227static const struct inode_operations mqueue_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 .lookup = simple_lookup,
1229 .create = mqueue_create,
1230 .unlink = mqueue_unlink,
1231};
1232
Arjan van de Ven9a321442007-02-12 00:55:35 -08001233static const struct file_operations mqueue_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 .flush = mqueue_flush_file,
1235 .poll = mqueue_poll_file,
1236 .read = mqueue_read_file,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001237 .llseek = default_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238};
1239
Alexey Dobriyanb87221d2009-09-21 17:01:09 -07001240static const struct super_operations mqueue_super_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 .alloc_inode = mqueue_alloc_inode,
1242 .destroy_inode = mqueue_destroy_inode,
Al Viro6d8af642010-06-05 16:29:45 -04001243 .evict_inode = mqueue_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245};
1246
1247static struct file_system_type mqueue_fs_type = {
1248 .name = "mqueue",
Al Viroceefda62010-07-26 13:16:50 +04001249 .mount = mqueue_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 .kill_sb = kill_litter_super,
1251};
1252
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -07001253int mq_init_ns(struct ipc_namespace *ns)
1254{
1255 ns->mq_queues_count = 0;
1256 ns->mq_queues_max = DFLT_QUEUESMAX;
1257 ns->mq_msg_max = DFLT_MSGMAX;
1258 ns->mq_msgsize_max = DFLT_MSGSIZEMAX;
1259
1260 ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns);
1261 if (IS_ERR(ns->mq_mnt)) {
1262 int err = PTR_ERR(ns->mq_mnt);
1263 ns->mq_mnt = NULL;
1264 return err;
1265 }
1266 return 0;
1267}
1268
1269void mq_clear_sbinfo(struct ipc_namespace *ns)
1270{
1271 ns->mq_mnt->mnt_sb->s_fs_info = NULL;
1272}
1273
1274void mq_put_mnt(struct ipc_namespace *ns)
1275{
Al Viro6f686572011-12-09 00:38:50 -05001276 kern_unmount(ns->mq_mnt);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -07001277}
1278
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279static int __init init_mqueue_fs(void)
1280{
1281 int error;
1282
1283 mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache",
1284 sizeof(struct mqueue_inode_info), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09001285 SLAB_HWCACHE_ALIGN, init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 if (mqueue_inode_cachep == NULL)
1287 return -ENOMEM;
1288
André Goddard Rosa2329e392010-02-23 04:04:27 -03001289 /* ignore failures - they are not fatal */
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -07001290 mq_sysctl_table = mq_register_sysctl_table();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292 error = register_filesystem(&mqueue_fs_type);
1293 if (error)
1294 goto out_sysctl;
1295
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -07001296 spin_lock_init(&mq_lock);
1297
Al Viro6f686572011-12-09 00:38:50 -05001298 error = mq_init_ns(&init_ipc_ns);
1299 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 goto out_filesystem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 return 0;
1303
1304out_filesystem:
1305 unregister_filesystem(&mqueue_fs_type);
1306out_sysctl:
1307 if (mq_sysctl_table)
1308 unregister_sysctl_table(mq_sysctl_table);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001309 kmem_cache_destroy(mqueue_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 return error;
1311}
1312
1313__initcall(init_mqueue_fs);