blob: a2757d4ab7734dd7f177e695f66f454964e8222d [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;
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -080069 struct user_namespace *notify_user_ns;
Adrian Bunk338cec32005-09-10 00:26:54 -070070 struct user_struct *user; /* user who created, for accounting */
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 struct sock *notify_sock;
72 struct sk_buff *notify_cookie;
73
74 /* for tasks waiting for free space and messages, respectively */
75 struct ext_wait_queue e_wait_q[2];
76
77 unsigned long qsize; /* size of queue in memory (sum of all msgs) */
78};
79
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080080static const struct inode_operations mqueue_dir_inode_operations;
Arjan van de Ven9a321442007-02-12 00:55:35 -080081static const struct file_operations mqueue_file_operations;
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070082static const struct super_operations mqueue_super_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static void remove_notification(struct mqueue_inode_info *info);
84
Christoph Lametere18b8902006-12-06 20:33:20 -080085static struct kmem_cache *mqueue_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87static struct ctl_table_header * mq_sysctl_table;
88
89static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode)
90{
91 return container_of(inode, struct mqueue_inode_info, vfs_inode);
92}
93
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070094/*
95 * This routine should be called with the mq_lock held.
96 */
97static inline struct ipc_namespace *__get_ns_from_inode(struct inode *inode)
Serge E. Hallyn614b84c2009-04-06 19:01:08 -070098{
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -070099 return get_ipc_ns(inode->i_sb->s_fs_info);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700100}
101
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700102static struct ipc_namespace *get_ns_from_inode(struct inode *inode)
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700103{
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700104 struct ipc_namespace *ns;
105
106 spin_lock(&mq_lock);
107 ns = __get_ns_from_inode(inode);
108 spin_unlock(&mq_lock);
109 return ns;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700110}
111
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700112static struct inode *mqueue_get_inode(struct super_block *sb,
Al Viro1b9d5ff72011-07-24 14:18:20 -0400113 struct ipc_namespace *ipc_ns, umode_t mode,
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700114 struct mq_attr *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
David Howells86a264a2008-11-14 10:39:18 +1100116 struct user_struct *u = current_user();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 struct inode *inode;
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700118 int ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 inode = new_inode(sb);
Jiri Slaby04715202011-07-26 16:08:46 -0700121 if (!inode)
122 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Jiri Slaby04715202011-07-26 16:08:46 -0700124 inode->i_ino = get_next_ino();
125 inode->i_mode = mode;
126 inode->i_uid = current_fsuid();
127 inode->i_gid = current_fsgid();
128 inode->i_mtime = inode->i_ctime = inode->i_atime = CURRENT_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Jiri Slaby04715202011-07-26 16:08:46 -0700130 if (S_ISREG(mode)) {
131 struct mqueue_inode_info *info;
Jiri Slaby04715202011-07-26 16:08:46 -0700132 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;
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -0800143 info->notify_user_ns = NULL;
Jiri Slaby04715202011-07-26 16:08:46 -0700144 info->qsize = 0;
145 info->user = NULL; /* set when all is ok */
146 memset(&info->attr, 0, sizeof(info->attr));
147 info->attr.mq_maxmsg = ipc_ns->mq_msg_max;
148 info->attr.mq_msgsize = ipc_ns->mq_msgsize_max;
149 if (attr) {
150 info->attr.mq_maxmsg = attr->mq_maxmsg;
151 info->attr.mq_msgsize = attr->mq_msgsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 }
Jiri Slaby04715202011-07-26 16:08:46 -0700153 mq_msg_tblsz = info->attr.mq_maxmsg * sizeof(struct msg_msg *);
154 info->messages = kmalloc(mq_msg_tblsz, GFP_KERNEL);
155 if (!info->messages)
156 goto out_inode;
157
158 mq_bytes = (mq_msg_tblsz +
159 (info->attr.mq_maxmsg * info->attr.mq_msgsize));
160
161 spin_lock(&mq_lock);
162 if (u->mq_bytes + mq_bytes < u->mq_bytes ||
Davidlohr Bueso2a4e64b2012-01-20 14:34:01 -0800163 u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) {
Jiri Slaby04715202011-07-26 16:08:46 -0700164 spin_unlock(&mq_lock);
165 /* mqueue_evict_inode() releases info->messages */
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700166 ret = -EMFILE;
Jiri Slaby04715202011-07-26 16:08:46 -0700167 goto out_inode;
168 }
169 u->mq_bytes += mq_bytes;
170 spin_unlock(&mq_lock);
171
172 /* all is ok */
173 info->user = get_uid(u);
174 } else if (S_ISDIR(mode)) {
175 inc_nlink(inode);
176 /* Some things misbehave if size == 0 on a directory */
177 inode->i_size = 2 * DIRENT_SIZE;
178 inode->i_op = &mqueue_dir_inode_operations;
179 inode->i_fop = &simple_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
Jiri Slaby04715202011-07-26 16:08:46 -0700181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return inode;
183out_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 iput(inode);
Jiri Slaby04715202011-07-26 16:08:46 -0700185err:
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700186 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
189static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
190{
191 struct inode *inode;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700192 struct ipc_namespace *ns = data;
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
Al Viro48fde702012-01-08 22:15:13 -0500199 inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO, NULL);
200 if (IS_ERR(inode))
201 return PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Al Viro48fde702012-01-08 22:15:13 -0500203 sb->s_root = d_make_root(inode);
204 if (!sb->s_root)
205 return -ENOMEM;
206 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
Al Viroceefda62010-07-26 13:16:50 +0400209static struct dentry *mqueue_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -0700210 int flags, const char *dev_name,
Al Viroceefda62010-07-26 13:16:50 +0400211 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700213 if (!(flags & MS_KERNMOUNT))
214 data = current->nsproxy->ipc_ns;
Al Viroceefda62010-07-26 13:16:50 +0400215 return mount_ns(fs_type, flags, data, mqueue_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700218static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
220 struct mqueue_inode_info *p = (struct mqueue_inode_info *) foo;
221
Christoph Lametera35afb82007-05-16 22:10:57 -0700222 inode_init_once(&p->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225static struct inode *mqueue_alloc_inode(struct super_block *sb)
226{
227 struct mqueue_inode_info *ei;
228
Christoph Lametere94b1762006-12-06 20:33:17 -0800229 ei = kmem_cache_alloc(mqueue_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (!ei)
231 return NULL;
232 return &ei->vfs_inode;
233}
234
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100235static void mqueue_i_callback(struct rcu_head *head)
236{
237 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100238 kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode));
239}
240
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241static void mqueue_destroy_inode(struct inode *inode)
242{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100243 call_rcu(&inode->i_rcu, mqueue_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
Al Viro6d8af642010-06-05 16:29:45 -0400246static void mqueue_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
248 struct mqueue_inode_info *info;
249 struct user_struct *user;
250 unsigned long mq_bytes;
251 int i;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700252 struct ipc_namespace *ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Jan Karadbd57682012-05-03 14:48:02 +0200254 clear_inode(inode);
Al Viro6d8af642010-06-05 16:29:45 -0400255
256 if (S_ISDIR(inode->i_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return;
Al Viro6d8af642010-06-05 16:29:45 -0400258
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700259 ipc_ns = get_ns_from_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 info = MQUEUE_I(inode);
261 spin_lock(&info->lock);
262 for (i = 0; i < info->attr.mq_curmsgs; i++)
263 free_msg(info->messages[i]);
264 kfree(info->messages);
265 spin_unlock(&info->lock);
266
André Goddard Rosa8834cf72010-02-23 04:04:24 -0300267 /* Total amount of bytes accounted for the mqueue */
268 mq_bytes = info->attr.mq_maxmsg * (sizeof(struct msg_msg *)
269 + info->attr.mq_msgsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 user = info->user;
271 if (user) {
272 spin_lock(&mq_lock);
273 user->mq_bytes -= mq_bytes;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700274 /*
275 * get_ns_from_inode() ensures that the
276 * (ipc_ns = sb->s_fs_info) is either a valid ipc_ns
277 * to which we now hold a reference, or it is NULL.
278 * We can't put it here under mq_lock, though.
279 */
280 if (ipc_ns)
281 ipc_ns->mq_queues_count--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 spin_unlock(&mq_lock);
283 free_uid(user);
284 }
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700285 if (ipc_ns)
286 put_ipc_ns(ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
289static int mqueue_create(struct inode *dir, struct dentry *dentry,
Al Viro4acdaf22011-07-26 01:42:34 -0400290 umode_t mode, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
292 struct inode *inode;
293 struct mq_attr *attr = dentry->d_fsdata;
294 int error;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700295 struct ipc_namespace *ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 spin_lock(&mq_lock);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700298 ipc_ns = __get_ns_from_inode(dir);
299 if (!ipc_ns) {
300 error = -EACCES;
301 goto out_unlock;
302 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700303 if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max &&
304 !capable(CAP_SYS_RESOURCE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 error = -ENOSPC;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700306 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700308 ipc_ns->mq_queues_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 spin_unlock(&mq_lock);
310
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700311 inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr);
Jiri Slabyd40dcdb2011-07-26 16:08:47 -0700312 if (IS_ERR(inode)) {
313 error = PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 spin_lock(&mq_lock);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700315 ipc_ns->mq_queues_count--;
316 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 }
318
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700319 put_ipc_ns(ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 dir->i_size += DIRENT_SIZE;
321 dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
322
323 d_instantiate(dentry, inode);
324 dget(dentry);
325 return 0;
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700326out_unlock:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 spin_unlock(&mq_lock);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700328 if (ipc_ns)
329 put_ipc_ns(ipc_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 return error;
331}
332
333static int mqueue_unlink(struct inode *dir, struct dentry *dentry)
334{
335 struct inode *inode = dentry->d_inode;
336
337 dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
338 dir->i_size -= DIRENT_SIZE;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700339 drop_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 dput(dentry);
341 return 0;
342}
343
344/*
345* This is routine for system read from queue file.
346* To avoid mess with doing here some sort of mq_receive we allow
347* to read only queue size & notification info (the only values
348* that are interesting from user point of view and aren't accessible
349* through std routines)
350*/
351static ssize_t mqueue_read_file(struct file *filp, char __user *u_data,
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700352 size_t count, loff_t *off)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
Josef Sipek6d630792006-12-08 02:37:11 -0800354 struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 char buffer[FILENT_SIZE];
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700356 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 spin_lock(&info->lock);
359 snprintf(buffer, sizeof(buffer),
360 "QSIZE:%-10lu NOTIFY:%-5d SIGNO:%-5d NOTIFY_PID:%-6d\n",
361 info->qsize,
362 info->notify_owner ? info->notify.sigev_notify : 0,
363 (info->notify_owner &&
364 info->notify.sigev_notify == SIGEV_SIGNAL) ?
365 info->notify.sigev_signo : 0,
Pavel Emelyanov6c5f3e72008-02-08 04:19:20 -0800366 pid_vnr(info->notify_owner));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 spin_unlock(&info->lock);
368 buffer[sizeof(buffer)-1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Akinobu Mitaf1a43f92008-07-25 01:48:07 -0700370 ret = simple_read_from_buffer(u_data, count, off, buffer,
371 strlen(buffer));
372 if (ret <= 0)
373 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Josef Sipek6d630792006-12-08 02:37:11 -0800375 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 -0700376 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700379static int mqueue_flush_file(struct file *filp, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380{
Josef Sipek6d630792006-12-08 02:37:11 -0800381 struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383 spin_lock(&info->lock);
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700384 if (task_tgid(current) == info->notify_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 remove_notification(info);
386
387 spin_unlock(&info->lock);
388 return 0;
389}
390
391static unsigned int mqueue_poll_file(struct file *filp, struct poll_table_struct *poll_tab)
392{
Josef Sipek6d630792006-12-08 02:37:11 -0800393 struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 int retval = 0;
395
396 poll_wait(filp, &info->wait_q, poll_tab);
397
398 spin_lock(&info->lock);
399 if (info->attr.mq_curmsgs)
400 retval = POLLIN | POLLRDNORM;
401
402 if (info->attr.mq_curmsgs < info->attr.mq_maxmsg)
403 retval |= POLLOUT | POLLWRNORM;
404 spin_unlock(&info->lock);
405
406 return retval;
407}
408
409/* Adds current to info->e_wait_q[sr] before element with smaller prio */
410static void wq_add(struct mqueue_inode_info *info, int sr,
411 struct ext_wait_queue *ewp)
412{
413 struct ext_wait_queue *walk;
414
415 ewp->task = current;
416
417 list_for_each_entry(walk, &info->e_wait_q[sr].list, list) {
418 if (walk->task->static_prio <= current->static_prio) {
419 list_add_tail(&ewp->list, &walk->list);
420 return;
421 }
422 }
423 list_add_tail(&ewp->list, &info->e_wait_q[sr].list);
424}
425
426/*
427 * Puts current task to sleep. Caller must hold queue lock. After return
428 * lock isn't held.
429 * sr: SEND or RECV
430 */
431static int wq_sleep(struct mqueue_inode_info *info, int sr,
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200432 ktime_t *timeout, struct ext_wait_queue *ewp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433{
434 int retval;
435 signed long time;
436
437 wq_add(info, sr, ewp);
438
439 for (;;) {
440 set_current_state(TASK_INTERRUPTIBLE);
441
442 spin_unlock(&info->lock);
Wanlong Gao32ea8452011-10-31 17:06:35 -0700443 time = schedule_hrtimeout_range_clock(timeout, 0,
444 HRTIMER_MODE_ABS, CLOCK_REALTIME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446 while (ewp->state == STATE_PENDING)
447 cpu_relax();
448
449 if (ewp->state == STATE_READY) {
450 retval = 0;
451 goto out;
452 }
453 spin_lock(&info->lock);
454 if (ewp->state == STATE_READY) {
455 retval = 0;
456 goto out_unlock;
457 }
458 if (signal_pending(current)) {
459 retval = -ERESTARTSYS;
460 break;
461 }
462 if (time == 0) {
463 retval = -ETIMEDOUT;
464 break;
465 }
466 }
467 list_del(&ewp->list);
468out_unlock:
469 spin_unlock(&info->lock);
470out:
471 return retval;
472}
473
474/*
475 * Returns waiting task that should be serviced first or NULL if none exists
476 */
477static struct ext_wait_queue *wq_get_first_waiter(
478 struct mqueue_inode_info *info, int sr)
479{
480 struct list_head *ptr;
481
482 ptr = info->e_wait_q[sr].list.prev;
483 if (ptr == &info->e_wait_q[sr].list)
484 return NULL;
485 return list_entry(ptr, struct ext_wait_queue, list);
486}
487
488/* Auxiliary functions to manipulate messages' list */
489static void msg_insert(struct msg_msg *ptr, struct mqueue_inode_info *info)
490{
491 int k;
492
493 k = info->attr.mq_curmsgs - 1;
494 while (k >= 0 && info->messages[k]->m_type >= ptr->m_type) {
495 info->messages[k + 1] = info->messages[k];
496 k--;
497 }
498 info->attr.mq_curmsgs++;
499 info->qsize += ptr->m_ts;
500 info->messages[k + 1] = ptr;
501}
502
503static inline struct msg_msg *msg_get(struct mqueue_inode_info *info)
504{
505 info->qsize -= info->messages[--info->attr.mq_curmsgs]->m_ts;
506 return info->messages[info->attr.mq_curmsgs];
507}
508
509static inline void set_cookie(struct sk_buff *skb, char code)
510{
511 ((char*)skb->data)[NOTIFY_COOKIE_LEN-1] = code;
512}
513
514/*
515 * The next function is only to split too long sys_mq_timedsend
516 */
517static void __do_notify(struct mqueue_inode_info *info)
518{
519 /* notification
520 * invoked when there is registered process and there isn't process
521 * waiting synchronously for message AND state of queue changed from
522 * empty to not empty. Here we are sure that no one is waiting
523 * synchronously. */
524 if (info->notify_owner &&
525 info->attr.mq_curmsgs == 1) {
526 struct siginfo sig_i;
527 switch (info->notify.sigev_notify) {
528 case SIGEV_NONE:
529 break;
530 case SIGEV_SIGNAL:
531 /* sends signal */
532
533 sig_i.si_signo = info->notify.sigev_signo;
534 sig_i.si_errno = 0;
535 sig_i.si_code = SI_MESGQ;
536 sig_i.si_value = info->notify.sigev_value;
Serge E. Hallyn6b550f92012-01-10 15:11:37 -0800537 /* map current pid/uid into info->owner's namespaces */
538 rcu_read_lock();
Sukadev Bhattiprolua6684992009-01-07 18:08:50 -0800539 sig_i.si_pid = task_tgid_nr_ns(current,
540 ns_of_pid(info->notify_owner));
Eric W. Biederman76b6db02012-03-14 15:24:19 -0700541 sig_i.si_uid = from_kuid_munged(info->notify_user_ns, current_uid());
Serge E. Hallyn6b550f92012-01-10 15:11:37 -0800542 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700544 kill_pid_info(info->notify.sigev_signo,
545 &sig_i, info->notify_owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 break;
547 case SIGEV_THREAD:
548 set_cookie(info->notify_cookie, NOTIFY_WOKENUP);
Denis V. Lunev7ee015e2007-10-10 21:14:03 -0700549 netlink_sendskb(info->notify_sock, info->notify_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 break;
551 }
552 /* after notification unregisters process */
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700553 put_pid(info->notify_owner);
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -0800554 put_user_ns(info->notify_user_ns);
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700555 info->notify_owner = NULL;
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -0800556 info->notify_user_ns = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
558 wake_up(&info->wait_q);
559}
560
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200561static int prepare_timeout(const struct timespec __user *u_abs_timeout,
562 ktime_t *expires, struct timespec *ts)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200564 if (copy_from_user(ts, u_abs_timeout, sizeof(struct timespec)))
565 return -EFAULT;
566 if (!timespec_valid(ts))
567 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200569 *expires = timespec_to_ktime(*ts);
570 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571}
572
573static void remove_notification(struct mqueue_inode_info *info)
574{
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700575 if (info->notify_owner != NULL &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 info->notify.sigev_notify == SIGEV_THREAD) {
577 set_cookie(info->notify_cookie, NOTIFY_REMOVED);
Denis V. Lunev7ee015e2007-10-10 21:14:03 -0700578 netlink_sendskb(info->notify_sock, info->notify_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 }
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700580 put_pid(info->notify_owner);
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -0800581 put_user_ns(info->notify_user_ns);
Cedric Le Goatera03fcb72006-10-02 02:17:26 -0700582 info->notify_owner = NULL;
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -0800583 info->notify_user_ns = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700586static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
588 if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0)
589 return 0;
590 if (capable(CAP_SYS_RESOURCE)) {
591 if (attr->mq_maxmsg > HARD_MSGMAX)
592 return 0;
593 } else {
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700594 if (attr->mq_maxmsg > ipc_ns->mq_msg_max ||
595 attr->mq_msgsize > ipc_ns->mq_msgsize_max)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return 0;
597 }
598 /* check for overflow */
599 if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg)
600 return 0;
André Goddard Rosa8834cf72010-02-23 04:04:24 -0300601 if ((unsigned long)(attr->mq_maxmsg * (attr->mq_msgsize
602 + sizeof (struct msg_msg *))) <
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 (unsigned long)(attr->mq_maxmsg * attr->mq_msgsize))
604 return 0;
605 return 1;
606}
607
608/*
609 * Invoked when creating a new queue via sys_mq_open
610 */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700611static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir,
Al Viro4acdaf22011-07-26 01:42:34 -0400612 struct dentry *dentry, int oflag, umode_t mode,
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700613 struct mq_attr *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614{
David Howells745ca242008-11-14 10:39:22 +1100615 const struct cred *cred = current_cred();
Dave Hansen4a3fd212008-02-15 14:37:48 -0800616 struct file *result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 int ret;
618
Al Viro564f6992008-12-14 04:02:26 -0500619 if (attr) {
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300620 if (!mq_attr_ok(ipc_ns, attr)) {
621 ret = -EINVAL;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500622 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300623 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 /* store for use during create */
Al Viro564f6992008-12-14 04:02:26 -0500625 dentry->d_fsdata = attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 }
627
Al Viroce3b0f82009-03-29 19:08:22 -0400628 mode &= ~current_umask();
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700629 ret = mnt_want_write(ipc_ns->mq_mnt);
Dave Hansen4a3fd212008-02-15 14:37:48 -0800630 if (ret)
631 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 ret = vfs_create(dir->d_inode, dentry, mode, NULL);
633 dentry->d_fsdata = NULL;
634 if (ret)
Dave Hansen4a3fd212008-02-15 14:37:48 -0800635 goto out_drop_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700637 result = dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
Dave Hansen4a3fd212008-02-15 14:37:48 -0800638 /*
639 * dentry_open() took a persistent mnt_want_write(),
640 * so we can now drop this one.
641 */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700642 mnt_drop_write(ipc_ns->mq_mnt);
Dave Hansen4a3fd212008-02-15 14:37:48 -0800643 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Dave Hansen4a3fd212008-02-15 14:37:48 -0800645out_drop_write:
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700646 mnt_drop_write(ipc_ns->mq_mnt);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500647out:
648 dput(dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700649 mntput(ipc_ns->mq_mnt);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500650 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651}
652
653/* Opens existing queue */
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700654static struct file *do_open(struct ipc_namespace *ipc_ns,
655 struct dentry *dentry, int oflag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300657 int ret;
David Howells745ca242008-11-14 10:39:22 +1100658 const struct cred *cred = current_cred();
659
660 static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
661 MAY_READ | MAY_WRITE };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Alexander Viro7c7dce92006-01-14 15:29:55 -0500663 if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300664 ret = -EINVAL;
665 goto err;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Al Virof419a2e2008-07-22 00:07:17 -0400668 if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) {
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300669 ret = -EACCES;
670 goto err;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500671 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700673 return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
André Goddard Rosa04db0dd2010-02-23 04:04:25 -0300674
675err:
676 dput(dentry);
677 mntput(ipc_ns->mq_mnt);
678 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679}
680
Al Virodf0a4282011-07-26 05:26:10 -0400681SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
Heiko Carstensd5460c92009-01-14 14:14:27 +0100682 struct mq_attr __user *, u_attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683{
684 struct dentry *dentry;
685 struct file *filp;
686 char *name;
Al Viro564f6992008-12-14 04:02:26 -0500687 struct mq_attr attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 int fd, error;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700689 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Al Viro564f6992008-12-14 04:02:26 -0500691 if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr)))
692 return -EFAULT;
693
694 audit_mq_open(oflag, mode, u_attr ? &attr : NULL);
George C. Wilson20ca73b2006-05-24 16:09:55 -0500695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 if (IS_ERR(name = getname(u_name)))
697 return PTR_ERR(name);
698
Ulrich Drepper269f2132008-05-03 15:28:45 -0400699 fd = get_unused_fd_flags(O_CLOEXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (fd < 0)
701 goto out_putname;
702
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700703 mutex_lock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
704 dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 if (IS_ERR(dentry)) {
706 error = PTR_ERR(dentry);
André Goddard Rosa4294a8e2010-02-23 04:04:28 -0300707 goto out_putfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700709 mntget(ipc_ns->mq_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
711 if (oflag & O_CREAT) {
712 if (dentry->d_inode) { /* entry already exists */
Al Viro5a190ae2007-06-07 12:19:32 -0400713 audit_inode(name, dentry);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300714 if (oflag & O_EXCL) {
715 error = -EEXIST;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500716 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300717 }
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700718 filp = do_open(ipc_ns, dentry, oflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 } else {
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700720 filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root,
721 dentry, oflag, mode,
Al Viro564f6992008-12-14 04:02:26 -0500722 u_attr ? &attr : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 }
Alexander Viro7c7dce92006-01-14 15:29:55 -0500724 } else {
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300725 if (!dentry->d_inode) {
726 error = -ENOENT;
Alexander Viro7c7dce92006-01-14 15:29:55 -0500727 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300728 }
Al Viro5a190ae2007-06-07 12:19:32 -0400729 audit_inode(name, dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700730 filp = do_open(ipc_ns, dentry, oflag);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500731 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
733 if (IS_ERR(filp)) {
734 error = PTR_ERR(filp);
735 goto out_putfd;
736 }
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 fd_install(fd, filp);
739 goto out_upsem;
740
Alexander Viro7c7dce92006-01-14 15:29:55 -0500741out:
742 dput(dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700743 mntput(ipc_ns->mq_mnt);
Alexander Viro7c7dce92006-01-14 15:29:55 -0500744out_putfd:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 put_unused_fd(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 fd = error;
747out_upsem:
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700748 mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749out_putname:
750 putname(name);
751 return fd;
752}
753
Heiko Carstensd5460c92009-01-14 14:14:27 +0100754SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
756 int err;
757 char *name;
758 struct dentry *dentry;
759 struct inode *inode = NULL;
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -0700760 struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
762 name = getname(u_name);
763 if (IS_ERR(name))
764 return PTR_ERR(name);
765
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700766 mutex_lock_nested(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex,
Peter Zijlstra7a434812007-03-06 01:42:09 -0800767 I_MUTEX_PARENT);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700768 dentry = lookup_one_len(name, ipc_ns->mq_mnt->mnt_root, strlen(name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 if (IS_ERR(dentry)) {
770 err = PTR_ERR(dentry);
771 goto out_unlock;
772 }
773
774 if (!dentry->d_inode) {
775 err = -ENOENT;
776 goto out_err;
777 }
778
779 inode = dentry->d_inode;
780 if (inode)
Al Viro7de9c6ee2010-10-23 11:11:40 -0400781 ihold(inode);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700782 err = mnt_want_write(ipc_ns->mq_mnt);
Dave Hansen06227532008-02-15 14:37:34 -0800783 if (err)
784 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 err = vfs_unlink(dentry->d_parent->d_inode, dentry);
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700786 mnt_drop_write(ipc_ns->mq_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787out_err:
788 dput(dentry);
789
790out_unlock:
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700791 mutex_unlock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 putname(name);
793 if (inode)
794 iput(inode);
795
796 return err;
797}
798
799/* Pipelined send and receive functions.
800 *
801 * If a receiver finds no waiting message, then it registers itself in the
802 * list of waiting receivers. A sender checks that list before adding the new
803 * message into the message array. If there is a waiting receiver, then it
804 * bypasses the message array and directly hands the message over to the
805 * receiver.
806 * The receiver accepts the message and returns without grabbing the queue
807 * spinlock. Therefore an intermediate STATE_PENDING state and memory barriers
808 * are necessary. The same algorithm is used for sysv semaphores, see
Serge E. Hallyn7b7a3172006-03-28 01:56:23 -0800809 * ipc/sem.c for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 *
811 * The same algorithm is used for senders.
812 */
813
814/* pipelined_send() - send a message directly to the task waiting in
815 * sys_mq_timedreceive() (without inserting message into a queue).
816 */
817static inline void pipelined_send(struct mqueue_inode_info *info,
818 struct msg_msg *message,
819 struct ext_wait_queue *receiver)
820{
821 receiver->msg = message;
822 list_del(&receiver->list);
823 receiver->state = STATE_PENDING;
824 wake_up_process(receiver->task);
akpm@osdl.orgd59dd462005-05-01 08:58:47 -0700825 smp_wmb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 receiver->state = STATE_READY;
827}
828
829/* pipelined_receive() - if there is task waiting in sys_mq_timedsend()
830 * gets its message and put to the queue (we have one free place for sure). */
831static inline void pipelined_receive(struct mqueue_inode_info *info)
832{
833 struct ext_wait_queue *sender = wq_get_first_waiter(info, SEND);
834
835 if (!sender) {
836 /* for poll */
837 wake_up_interruptible(&info->wait_q);
838 return;
839 }
840 msg_insert(sender->msg, info);
841 list_del(&sender->list);
842 sender->state = STATE_PENDING;
843 wake_up_process(sender->task);
akpm@osdl.orgd59dd462005-05-01 08:58:47 -0700844 smp_wmb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 sender->state = STATE_READY;
846}
847
Heiko Carstensc4ea37c2009-01-14 14:14:28 +0100848SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
849 size_t, msg_len, unsigned int, msg_prio,
850 const struct timespec __user *, u_abs_timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
852 struct file *filp;
853 struct inode *inode;
854 struct ext_wait_queue wait;
855 struct ext_wait_queue *receiver;
856 struct msg_msg *msg_ptr;
857 struct mqueue_inode_info *info;
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200858 ktime_t expires, *timeout = NULL;
859 struct timespec ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 int ret;
861
Al Viroc32c8af2008-12-14 03:46:48 -0500862 if (u_abs_timeout) {
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200863 int res = prepare_timeout(u_abs_timeout, &expires, &ts);
864 if (res)
865 return res;
866 timeout = &expires;
Al Viroc32c8af2008-12-14 03:46:48 -0500867 }
George C. Wilson20ca73b2006-05-24 16:09:55 -0500868
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX))
870 return -EINVAL;
871
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200872 audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300875 if (unlikely(!filp)) {
876 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300878 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Josef Sipek6d630792006-12-08 02:37:11 -0800880 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300881 if (unlikely(filp->f_op != &mqueue_file_operations)) {
882 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 info = MQUEUE_I(inode);
Al Viro5a190ae2007-06-07 12:19:32 -0400886 audit_inode(NULL, filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300888 if (unlikely(!(filp->f_mode & FMODE_WRITE))) {
889 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300891 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
893 if (unlikely(msg_len > info->attr.mq_msgsize)) {
894 ret = -EMSGSIZE;
895 goto out_fput;
896 }
897
898 /* First try to allocate memory, before doing anything with
899 * existing queues. */
900 msg_ptr = load_msg(u_msg_ptr, msg_len);
901 if (IS_ERR(msg_ptr)) {
902 ret = PTR_ERR(msg_ptr);
903 goto out_fput;
904 }
905 msg_ptr->m_ts = msg_len;
906 msg_ptr->m_type = msg_prio;
907
908 spin_lock(&info->lock);
909
910 if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) {
911 if (filp->f_flags & O_NONBLOCK) {
912 spin_unlock(&info->lock);
913 ret = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 } else {
915 wait.task = current;
916 wait.msg = (void *) msg_ptr;
917 wait.state = STATE_NONE;
918 ret = wq_sleep(info, SEND, timeout, &wait);
919 }
920 if (ret < 0)
921 free_msg(msg_ptr);
922 } else {
923 receiver = wq_get_first_waiter(info, RECV);
924 if (receiver) {
925 pipelined_send(info, msg_ptr, receiver);
926 } else {
927 /* adds message to the queue */
928 msg_insert(msg_ptr, info);
929 __do_notify(info);
930 }
931 inode->i_atime = inode->i_mtime = inode->i_ctime =
932 CURRENT_TIME;
933 spin_unlock(&info->lock);
934 ret = 0;
935 }
936out_fput:
937 fput(filp);
938out:
939 return ret;
940}
941
Heiko Carstensc4ea37c2009-01-14 14:14:28 +0100942SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
943 size_t, msg_len, unsigned int __user *, u_msg_prio,
944 const struct timespec __user *, u_abs_timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 ssize_t ret;
947 struct msg_msg *msg_ptr;
948 struct file *filp;
949 struct inode *inode;
950 struct mqueue_inode_info *info;
951 struct ext_wait_queue wait;
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200952 ktime_t expires, *timeout = NULL;
953 struct timespec ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Al Viroc32c8af2008-12-14 03:46:48 -0500955 if (u_abs_timeout) {
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200956 int res = prepare_timeout(u_abs_timeout, &expires, &ts);
957 if (res)
958 return res;
959 timeout = &expires;
Al Viroc32c8af2008-12-14 03:46:48 -0500960 }
George C. Wilson20ca73b2006-05-24 16:09:55 -0500961
Carsten Emde9ca7d8e2010-04-02 22:40:20 +0200962 audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300965 if (unlikely(!filp)) {
966 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300968 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Josef Sipek6d630792006-12-08 02:37:11 -0800970 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300971 if (unlikely(filp->f_op != &mqueue_file_operations)) {
972 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300974 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 info = MQUEUE_I(inode);
Al Viro5a190ae2007-06-07 12:19:32 -0400976 audit_inode(NULL, filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300978 if (unlikely(!(filp->f_mode & FMODE_READ))) {
979 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -0300981 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
983 /* checks if buffer is big enough */
984 if (unlikely(msg_len < info->attr.mq_msgsize)) {
985 ret = -EMSGSIZE;
986 goto out_fput;
987 }
988
989 spin_lock(&info->lock);
990 if (info->attr.mq_curmsgs == 0) {
991 if (filp->f_flags & O_NONBLOCK) {
992 spin_unlock(&info->lock);
993 ret = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 } else {
995 wait.task = current;
996 wait.state = STATE_NONE;
997 ret = wq_sleep(info, RECV, timeout, &wait);
998 msg_ptr = wait.msg;
999 }
1000 } else {
1001 msg_ptr = msg_get(info);
1002
1003 inode->i_atime = inode->i_mtime = inode->i_ctime =
1004 CURRENT_TIME;
1005
1006 /* There is now free space in queue. */
1007 pipelined_receive(info);
1008 spin_unlock(&info->lock);
1009 ret = 0;
1010 }
1011 if (ret == 0) {
1012 ret = msg_ptr->m_ts;
1013
1014 if ((u_msg_prio && put_user(msg_ptr->m_type, u_msg_prio)) ||
1015 store_msg(u_msg_ptr, msg_ptr, msg_ptr->m_ts)) {
1016 ret = -EFAULT;
1017 }
1018 free_msg(msg_ptr);
1019 }
1020out_fput:
1021 fput(filp);
1022out:
1023 return ret;
1024}
1025
1026/*
1027 * Notes: the case when user wants us to deregister (with NULL as pointer)
1028 * and he isn't currently owner of notification, will be silently discarded.
1029 * It isn't explicitly defined in the POSIX.
1030 */
Heiko Carstensc4ea37c2009-01-14 14:14:28 +01001031SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,
1032 const struct sigevent __user *, u_notification)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033{
1034 int ret;
1035 struct file *filp;
1036 struct sock *sock;
1037 struct inode *inode;
1038 struct sigevent notification;
1039 struct mqueue_inode_info *info;
1040 struct sk_buff *nc;
1041
Al Viro20114f72008-12-10 07:16:12 -05001042 if (u_notification) {
1043 if (copy_from_user(&notification, u_notification,
1044 sizeof(struct sigevent)))
1045 return -EFAULT;
1046 }
1047
1048 audit_mq_notify(mqdes, u_notification ? &notification : NULL);
George C. Wilson20ca73b2006-05-24 16:09:55 -05001049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 nc = NULL;
1051 sock = NULL;
1052 if (u_notification != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 if (unlikely(notification.sigev_notify != SIGEV_NONE &&
1054 notification.sigev_notify != SIGEV_SIGNAL &&
1055 notification.sigev_notify != SIGEV_THREAD))
1056 return -EINVAL;
1057 if (notification.sigev_notify == SIGEV_SIGNAL &&
Jesper Juhl7ed20e12005-05-01 08:59:14 -07001058 !valid_signal(notification.sigev_signo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 return -EINVAL;
1060 }
1061 if (notification.sigev_notify == SIGEV_THREAD) {
Patrick McHardyc3d8d1e2007-11-07 02:42:09 -08001062 long timeo;
1063
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 /* create the notify skb */
1065 nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001066 if (!nc) {
1067 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001069 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 if (copy_from_user(nc->data,
1071 notification.sigev_value.sival_ptr,
1072 NOTIFY_COOKIE_LEN)) {
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001073 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 goto out;
1075 }
1076
1077 /* TODO: add a header? */
1078 skb_put(nc, NOTIFY_COOKIE_LEN);
1079 /* and attach it to the socket */
1080retry:
1081 filp = fget(notification.sigev_signo);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001082 if (!filp) {
1083 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001085 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 sock = netlink_getsockbyfilp(filp);
1087 fput(filp);
1088 if (IS_ERR(sock)) {
1089 ret = PTR_ERR(sock);
1090 sock = NULL;
1091 goto out;
1092 }
1093
Patrick McHardyc3d8d1e2007-11-07 02:42:09 -08001094 timeo = MAX_SCHEDULE_TIMEOUT;
Denis V. Lunev9457afe2008-06-05 11:23:39 -07001095 ret = netlink_attachskb(sock, nc, &timeo, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 if (ret == 1)
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001097 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 if (ret) {
1099 sock = NULL;
1100 nc = NULL;
1101 goto out;
1102 }
1103 }
1104 }
1105
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001107 if (!filp) {
1108 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001110 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111
Josef Sipek6d630792006-12-08 02:37:11 -08001112 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001113 if (unlikely(filp->f_op != &mqueue_file_operations)) {
1114 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001116 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 info = MQUEUE_I(inode);
1118
1119 ret = 0;
1120 spin_lock(&info->lock);
1121 if (u_notification == NULL) {
Cedric Le Goatera03fcb72006-10-02 02:17:26 -07001122 if (info->notify_owner == task_tgid(current)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 remove_notification(info);
1124 inode->i_atime = inode->i_ctime = CURRENT_TIME;
1125 }
Cedric Le Goatera03fcb72006-10-02 02:17:26 -07001126 } else if (info->notify_owner != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 ret = -EBUSY;
1128 } else {
1129 switch (notification.sigev_notify) {
1130 case SIGEV_NONE:
1131 info->notify.sigev_notify = SIGEV_NONE;
1132 break;
1133 case SIGEV_THREAD:
1134 info->notify_sock = sock;
1135 info->notify_cookie = nc;
1136 sock = NULL;
1137 nc = NULL;
1138 info->notify.sigev_notify = SIGEV_THREAD;
1139 break;
1140 case SIGEV_SIGNAL:
1141 info->notify.sigev_signo = notification.sigev_signo;
1142 info->notify.sigev_value = notification.sigev_value;
1143 info->notify.sigev_notify = SIGEV_SIGNAL;
1144 break;
1145 }
Cedric Le Goatera03fcb72006-10-02 02:17:26 -07001146
1147 info->notify_owner = get_pid(task_tgid(current));
Eric W. Biederman6f9ac6d2011-11-16 22:57:55 -08001148 info->notify_user_ns = get_user_ns(current_user_ns());
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 inode->i_atime = inode->i_ctime = CURRENT_TIME;
1150 }
1151 spin_unlock(&info->lock);
1152out_fput:
1153 fput(filp);
1154out:
1155 if (sock) {
1156 netlink_detachskb(sock, nc);
1157 } else if (nc) {
1158 dev_kfree_skb(nc);
1159 }
1160 return ret;
1161}
1162
Heiko Carstensc4ea37c2009-01-14 14:14:28 +01001163SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
1164 const struct mq_attr __user *, u_mqstat,
1165 struct mq_attr __user *, u_omqstat)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166{
1167 int ret;
1168 struct mq_attr mqstat, omqstat;
1169 struct file *filp;
1170 struct inode *inode;
1171 struct mqueue_inode_info *info;
1172
1173 if (u_mqstat != NULL) {
1174 if (copy_from_user(&mqstat, u_mqstat, sizeof(struct mq_attr)))
1175 return -EFAULT;
1176 if (mqstat.mq_flags & (~O_NONBLOCK))
1177 return -EINVAL;
1178 }
1179
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 filp = fget(mqdes);
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001181 if (!filp) {
1182 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 goto out;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
Josef Sipek6d630792006-12-08 02:37:11 -08001186 inode = filp->f_path.dentry->d_inode;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001187 if (unlikely(filp->f_op != &mqueue_file_operations)) {
1188 ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 goto out_fput;
André Goddard Rosa8d8ffef2010-02-23 04:04:26 -03001190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 info = MQUEUE_I(inode);
1192
1193 spin_lock(&info->lock);
1194
1195 omqstat = info->attr;
1196 omqstat.mq_flags = filp->f_flags & O_NONBLOCK;
1197 if (u_mqstat) {
Al Viro73929062008-12-10 06:58:59 -05001198 audit_mq_getsetattr(mqdes, &mqstat);
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -07001199 spin_lock(&filp->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 if (mqstat.mq_flags & O_NONBLOCK)
1201 filp->f_flags |= O_NONBLOCK;
1202 else
1203 filp->f_flags &= ~O_NONBLOCK;
Jonathan Corbetdb1dd4d2009-02-06 15:25:24 -07001204 spin_unlock(&filp->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
1206 inode->i_atime = inode->i_ctime = CURRENT_TIME;
1207 }
1208
1209 spin_unlock(&info->lock);
1210
1211 ret = 0;
1212 if (u_omqstat != NULL && copy_to_user(u_omqstat, &omqstat,
1213 sizeof(struct mq_attr)))
1214 ret = -EFAULT;
1215
1216out_fput:
1217 fput(filp);
1218out:
1219 return ret;
1220}
1221
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08001222static const struct inode_operations mqueue_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 .lookup = simple_lookup,
1224 .create = mqueue_create,
1225 .unlink = mqueue_unlink,
1226};
1227
Arjan van de Ven9a321442007-02-12 00:55:35 -08001228static const struct file_operations mqueue_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 .flush = mqueue_flush_file,
1230 .poll = mqueue_poll_file,
1231 .read = mqueue_read_file,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001232 .llseek = default_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233};
1234
Alexey Dobriyanb87221d2009-09-21 17:01:09 -07001235static const struct super_operations mqueue_super_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 .alloc_inode = mqueue_alloc_inode,
1237 .destroy_inode = mqueue_destroy_inode,
Al Viro6d8af642010-06-05 16:29:45 -04001238 .evict_inode = mqueue_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240};
1241
1242static struct file_system_type mqueue_fs_type = {
1243 .name = "mqueue",
Al Viroceefda62010-07-26 13:16:50 +04001244 .mount = mqueue_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 .kill_sb = kill_litter_super,
1246};
1247
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -07001248int mq_init_ns(struct ipc_namespace *ns)
1249{
1250 ns->mq_queues_count = 0;
1251 ns->mq_queues_max = DFLT_QUEUESMAX;
1252 ns->mq_msg_max = DFLT_MSGMAX;
1253 ns->mq_msgsize_max = DFLT_MSGSIZEMAX;
1254
1255 ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns);
1256 if (IS_ERR(ns->mq_mnt)) {
1257 int err = PTR_ERR(ns->mq_mnt);
1258 ns->mq_mnt = NULL;
1259 return err;
1260 }
1261 return 0;
1262}
1263
1264void mq_clear_sbinfo(struct ipc_namespace *ns)
1265{
1266 ns->mq_mnt->mnt_sb->s_fs_info = NULL;
1267}
1268
1269void mq_put_mnt(struct ipc_namespace *ns)
1270{
Al Viro6f686572011-12-09 00:38:50 -05001271 kern_unmount(ns->mq_mnt);
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -07001272}
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274static int __init init_mqueue_fs(void)
1275{
1276 int error;
1277
1278 mqueue_inode_cachep = kmem_cache_create("mqueue_inode_cache",
1279 sizeof(struct mqueue_inode_info), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09001280 SLAB_HWCACHE_ALIGN, init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 if (mqueue_inode_cachep == NULL)
1282 return -ENOMEM;
1283
André Goddard Rosa2329e392010-02-23 04:04:27 -03001284 /* ignore failures - they are not fatal */
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -07001285 mq_sysctl_table = mq_register_sysctl_table();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
1287 error = register_filesystem(&mqueue_fs_type);
1288 if (error)
1289 goto out_sysctl;
1290
Serge E. Hallyn7eafd7c2009-04-06 19:01:10 -07001291 spin_lock_init(&mq_lock);
1292
Al Viro6f686572011-12-09 00:38:50 -05001293 error = mq_init_ns(&init_ipc_ns);
1294 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 goto out_filesystem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 return 0;
1298
1299out_filesystem:
1300 unregister_filesystem(&mqueue_fs_type);
1301out_sysctl:
1302 if (mq_sysctl_table)
1303 unregister_sysctl_table(mq_sysctl_table);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001304 kmem_cache_destroy(mqueue_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 return error;
1306}
1307
1308__initcall(init_mqueue_fs);