Linux mqueue mount命名空间与mqueue_create
Linux mqueue mount命名空间与mqueue_create
POSIX消息队列文件系统(mqueue)是基于VFS的伪文件系统，在内核中注册为mqueue_fs_type。mount系统调用触发mount_mqueue函数，该函数在/sys/fs/或/dev/mqueue挂载点创建实例，返回超级块和根dentry。每个ipc_namespace可以独立挂载mqueue实例。
mqueue文件系统的定义：
```c
static struct file_system_type mqueue_fs_type = {
.name = "mqueue",
.init_fs_context = mqueue_init_fs_context,
.kill_sb = mqueue_kill_sb,
.fs_flags = FS_USERNS_MOUNT,
};
```
mount_mqueue在内核空间创建mqueue超级块，将其附加到特定命名空间的mnt_mqueue字段。init_fs_context回调创建mqueue_context，通过get_tree_single挂载到当前命名空间。关键区别在于mqueue的超级块是单实例的，每个命名空间只有一个实例：
```c
static int mqueue_init_fs_context(struct fs_context *fc)
{
struct ipc_namespace *ns = current->nsproxy->ipc_ns;
fc->ops = &mqueue_context_ops;
/* 将ipc命名空间引用存入fc->s_fs_info */
put_user_ns(fc->user_ns);
fc->user_ns = get_user_ns(ns->user_ns);
fc->s_fs_info = get_ipc_ns(ns);
return 0;
}
```
mqueue_create是vfs_create回调的实现，当用户通过open("mqname", O_CREAT)创建POSIX消息队列时被调用。核心入口是do_mq_open中的mq_create：
```c
static int do_mq_open(const char __user *u_name, int oflag, umode_t mode,
struct mq_attr __user *u_attr)
{
struct path path;
struct fd f;
int ret;
ret = mq_pathname(&path, u_name);
if (ret)
return ret;
if (oflag & O_CREAT) {
if (oflag & O_EXCL)
ret = vfs_create(mnt_idmap(path.mnt),
d_inode(path.dentry),
path.dentry, mode, true);
else
ret = mqueue_create_attr(&path, u_attr);
} else {
ret = vfs_open(&path, oflag);
}
...
}
```
mqueue_create_attr是实际创建队列的函数，它使用mqueue的inode操作创建新inode：
```c
static int mqueue_create_attr(struct path *path, struct mq_attr __user *u_attr)
{
struct inode *dir = d_inode(path->dentry);
struct inode *inode;
struct mqueue_inode_info *info;
inode = mqueue_get_inode(dir->i_sb, dir->i_mode, &attr);
if (IS_ERR(inode))
return PTR_ERR(inode);
info = MQUEUE_I(inode);
/* 写入用户传入的mq_attr */
if (u_attr && copy_from_user(&info->attr, u_attr, sizeof(info->attr)))
return -EFAULT;
d_instantiate(path->dentry, inode);
dget(path->dentry);
...
}
```
struct mqueue_inode_info是每个消息队列的inode私有信息：
```c
struct mqueue_inode_info {
spinlock_t lock;
struct inode vfs_inode;
wait_queue_head_t wait_q; /* 收发等待队列头 */
struct rb_root_cached msg_tree; /* 消息红黑树根 */
struct list_head msg_list; /* 消息链表（按优先级排序） */
unsigned int qsize; /* 消息总字节数 */
unsigned int qnum; /* 消息总数 */
unsigned int qlimit; /* 消息上限，由mq_maxmsg决定 */
unsigned int qsize_max; /* 单条消息上限，由mq_msgsize决定 */
struct sigevent notify; /* 信号通知配置 */
pid_t notify_owner; /* 通知进程pid */
struct user_struct *user; /* 关联用户结构 */
struct sock *notify_sock; /* netlink sock */
struct sk_buff *notify_cookie;
/* 消息数据跟在后面，通过flexible array引用 */
};
```
mqueue的inode操作通过vfs_create进行，其中mqueue_create回调实际上通过mqueue_get_inode创建inode后在目录项中添加条目。mqueue_create中调用mqueue_get_inode，后者根据S_IFREG模式创建新的inode：
```c
static struct inode *mqueue_get_inode(struct super_block *sb,
umode_t mode, struct mq_attr *attr)
{
struct inode *inode;
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_ino = get_next_ino();
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_mtime = inode->i_ctime = inode->i_atime = current_time(inode);
if (S_ISREG(mode)) {
struct mqueue_inode_info *info = MQUEUE_I(inode);
inode->i_fop = &mqueue_file_operations;
inode->i_size = 0;
info->attr = *attr;
info->qsize = 0;
info->qnum = 0;
/* 权限校验：确保msg_max和msgsize不超过系统限制 */
if (attr) {
if (attr->mq_maxmsg > info->mq_sys_msg_max)
return ERR_PTR(-EINVAL);
if (attr->mq_msgsize > info->mq_sys_msgsize_max)
return ERR_PTR(-EINVAL);
}
}
return inode;
}
```
挂载命名空间的隔离能力体现在每个ipc_namespace持有独立的mq_queues_sysctl_max和mq_queues_count。mq_create在创建新队列前检查当前命名空间内的队列总数是否达到上限。创建队列后，mq_queues_count递增。mq_unlink或关闭最后一个fd时递减。
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POSIX消息队列文件系统(mqueue)是基于VFS的伪文件系统，在内核中注册为mqueue_fs_type。mount系统调用触发mount_mqueue函数，该函数在/sys/fs/或/dev/mqueue挂载点创建实例，返回超级块和根dentry。每个ipc_namespace可以独立挂载mqueue实例。
mqueue文件系统的定义：
```c
static struct file_system_type mqueue_fs_type = {
.name = "mqueue",
.init_fs_context = mqueue_init_fs_context,
.kill_sb = mqueue_kill_sb,
.fs_flags = FS_USERNS_MOUNT,
};
```
mount_mqueue在内核空间创建mqueue超级块，将其附加到特定命名空间的mnt_mqueue字段。init_fs_context回调创建mqueue_context，通过get_tree_single挂载到当前命名空间。关键区别在于mqueue的超级块是单实例的，每个命名空间只有一个实例：
```c
static int mqueue_init_fs_context(struct fs_context *fc)
{
struct ipc_namespace *ns = current->nsproxy->ipc_ns;
fc->ops = &mqueue_context_ops;
/* 将ipc命名空间引用存入fc->s_fs_info */
put_user_ns(fc->user_ns);
fc->user_ns = get_user_ns(ns->user_ns);
fc->s_fs_info = get_ipc_ns(ns);
return 0;
}
```
mqueue_create是vfs_create回调的实现，当用户通过open("mqname", O_CREAT)创建POSIX消息队列时被调用。核心入口是do_mq_open中的mq_create：
```c
static int do_mq_open(const char __user *u_name, int oflag, umode_t mode,
struct mq_attr __user *u_attr)
{
struct path path;
struct fd f;
int ret;
ret = mq_pathname(&path, u_name);
if (ret)
return ret;
if (oflag & O_CREAT) {
if (oflag & O_EXCL)
ret = vfs_create(mnt_idmap(path.mnt),
d_inode(path.dentry),
path.dentry, mode, true);
else
ret = mqueue_create_attr(&path, u_attr);
} else {
ret = vfs_open(&path, oflag);
}
...
}
```
mqueue_create_attr是实际创建队列的函数，它使用mqueue的inode操作创建新inode：
```c
static int mqueue_create_attr(struct path *path, struct mq_attr __user *u_attr)
{
struct inode *dir = d_inode(path->dentry);
struct inode *inode;
struct mqueue_inode_info *info;
inode = mqueue_get_inode(dir->i_sb, dir->i_mode, &attr);
if (IS_ERR(inode))
return PTR_ERR(inode);
info = MQUEUE_I(inode);
/* 写入用户传入的mq_attr */
if (u_attr && copy_from_user(&info->attr, u_attr, sizeof(info->attr)))
return -EFAULT;
d_instantiate(path->dentry, inode);
dget(path->dentry);
...
}
```
struct mqueue_inode_info是每个消息队列的inode私有信息：
```c
struct mqueue_inode_info {
spinlock_t lock;
struct inode vfs_inode;
wait_queue_head_t wait_q; /* 收发等待队列头 */
struct rb_root_cached msg_tree; /* 消息红黑树根 */
struct list_head msg_list; /* 消息链表（按优先级排序） */
unsigned int qsize; /* 消息总字节数 */
unsigned int qnum; /* 消息总数 */
unsigned int qlimit; /* 消息上限，由mq_maxmsg决定 */
unsigned int qsize_max; /* 单条消息上限，由mq_msgsize决定 */
struct sigevent notify; /* 信号通知配置 */
pid_t notify_owner; /* 通知进程pid */
struct user_struct *user; /* 关联用户结构 */
struct sock *notify_sock; /* netlink sock */
struct sk_buff *notify_cookie;
/* 消息数据跟在后面，通过flexible array引用 */
};
```
mqueue的inode操作通过vfs_create进行，其中mqueue_create回调实际上通过mqueue_get_inode创建inode后在目录项中添加条目。mqueue_create中调用mqueue_get_inode，后者根据S_IFREG模式创建新的inode：
```c
static struct inode *mqueue_get_inode(struct super_block *sb,
umode_t mode, struct mq_attr *attr)
{
struct inode *inode;
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_ino = get_next_ino();
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_mtime = inode->i_ctime = inode->i_atime = current_time(inode);
if (S_ISREG(mode)) {
struct mqueue_inode_info *info = MQUEUE_I(inode);
inode->i_fop = &mqueue_file_operations;
inode->i_size = 0;
info->attr = *attr;
info->qsize = 0;
info->qnum = 0;
/* 权限校验：确保msg_max和msgsize不超过系统限制 */
if (attr) {
if (attr->mq_maxmsg > info->mq_sys_msg_max)
return ERR_PTR(-EINVAL);
if (attr->mq_msgsize > info->mq_sys_msgsize_max)
return ERR_PTR(-EINVAL);
}
}
return inode;
}
```
挂载命名空间的隔离能力体现在每个ipc_namespace持有独立的mq_queues_sysctl_max和mq_queues_count。mq_create在创建新队列前检查当前命名空间内的队列总数是否达到上限。创建队列后，mq_queues_count递增。mq_unlink或关闭最后一个fd时递减。
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