Linux mqueue mount命名空间与mqueue_createPOSIX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cstatic 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cstatic 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_createcstatic 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);elseret 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inodecstatic 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cstruct 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inodecstatic 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 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Linux mqueue mount命名空间与mqueue_create
发布时间：2026/6/15 2:44:12
Linux mqueue mount命名空间与mqueue_createPOSIX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cstatic 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cstatic 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_createcstatic 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);elseret 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inodecstatic 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cstruct 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inodecstatic 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。ptx.gixrq.cn/17913.Docptx.gixrq.cn/82462.Docptx.gixrq.cn/48958.Docptx.gixrq.cn/80684.Docptx.gixrq.cn/19595.Docptx.gixrq.cn/59931.Docptx.gixrq.cn/20244.Docptx.gixrq.cn/04046.Docptx.gixrq.cn/95375.Docptx.gixrq.cn/08468.Docptz.gixrq.cn/02208.Docptz.gixrq.cn/86282.Docptz.gixrq.cn/19171.Docptz.gixrq.cn/68282.Docptz.gixrq.cn/33537.Docptz.gixrq.cn/33553.Docptz.gixrq.cn/42806.Docptz.gixrq.cn/73117.Docptz.gixrq.cn/46866.Docptz.gixrq.cn/11537.Docptl.gixrq.cn/15357.Docptl.gixrq.cn/64008.Docptl.gixrq.cn/02246.Docptl.gixrq.cn/26444.Docptl.gixrq.cn/57395.Docptl.gixrq.cn/22028.Docptl.gixrq.cn/62040.Docptl.gixrq.cn/60826.Docptl.gixrq.cn/71311.Docptl.gixrq.cn/31355.Docptk.gixrq.cn/95171.Docptk.gixrq.cn/02484.Docptk.gixrq.cn/75935.Docptk.gixrq.cn/39171.Docptk.gixrq.cn/48064.Docptk.gixrq.cn/40004.Docptk.gixrq.cn/37755.Docptk.gixrq.cn/02288.Docptk.gixrq.cn/86644.Docptk.gixrq.cn/60660.Docptj.gixrq.cn/06246.Docptj.gixrq.cn/00866.Docptj.gixrq.cn/35951.Docptj.gixrq.cn/00806.Docptj.gixrq.cn/68622.Docptj.gixrq.cn/99959.Docptj.gixrq.cn/84688.Docptj.gixrq.cn/79993.Docptj.gixrq.cn/02400.Docptj.gixrq.cn/39953.Docpth.gixrq.cn/17717.Docpth.gixrq.cn/99731.Docpth.gixrq.cn/71515.Docpth.gixrq.cn/19733.Docpth.gixrq.cn/71197.Docpth.gixrq.cn/04228.Docpth.gixrq.cn/86208.Docpth.gixrq.cn/57133.Docpth.gixrq.cn/08137.Docpth.gixrq.cn/77379.Docptg.gixrq.cn/33575.Docptg.gixrq.cn/40064.Docptg.gixrq.cn/42088.Docptg.gixrq.cn/51539.Docptg.gixrq.cn/69390.Docptg.gixrq.cn/64828.Docptg.gixrq.cn/08004.Docptg.gixrq.cn/79937.Docptg.gixrq.cn/64628.Docptg.gixrq.cn/86400.Docptf.gixrq.cn/20844.Docptf.gixrq.cn/46028.Docptf.gixrq.cn/17397.Docptf.gixrq.cn/08248.Docptf.gixrq.cn/53719.Docptf.gixrq.cn/66684.Docptf.gixrq.cn/99951.Docptf.gixrq.cn/15131.Docptf.gixrq.cn/37531.Docptf.gixrq.cn/42248.Docptd.gixrq.cn/00826.Docptd.gixrq.cn/59319.Docptd.gixrq.cn/37191.Docptd.gixrq.cn/44517.Docptd.gixrq.cn/06480.Docptd.gixrq.cn/86662.Docptd.gixrq.cn/74637.Docptd.gixrq.cn/46600.Docptd.gixrq.cn/88440.Docptd.gixrq.cn/14773.Docpts.gixrq.cn/37591.Docpts.gixrq.cn/51975.Docpts.gixrq.cn/16640.Docpts.gixrq.cn/28002.Docpts.gixrq.cn/68046.Docpts.gixrq.cn/88006.Docpts.gixrq.cn/86086.Docpts.gixrq.cn/99511.Docpts.gixrq.cn/04042.Docpts.gixrq.cn/57111.Docpta.gixrq.cn/40260.Docpta.gixrq.cn/15337.Docpta.gixrq.cn/77511.Docpta.gixrq.cn/99935.Docpta.gixrq.cn/59395.Docpta.gixrq.cn/71593.Docpta.gixrq.cn/55555.Docpta.gixrq.cn/33951.Docpta.gixrq.cn/99939.Docpta.gixrq.cn/02246.Docptp.gixrq.cn/20604.Docptp.gixrq.cn/31395.Docptp.gixrq.cn/40288.Docptp.gixrq.cn/06846.Docptp.gixrq.cn/19953.Docptp.gixrq.cn/40042.Docptp.gixrq.cn/91531.Docptp.gixrq.cn/37315.Docptp.gixrq.cn/55101.Docptp.gixrq.cn/90843.Docpto.gixrq.cn/31197.Docpto.gixrq.cn/06468.Docpto.gixrq.cn/49621.Docpto.gixrq.cn/95697.Docpto.gixrq.cn/13513.Docpto.gixrq.cn/08808.Docpto.gixrq.cn/82344.Docpto.gixrq.cn/04468.Docpto.gixrq.cn/06206.Docpto.gixrq.cn/64066.Docpti.gixrq.cn/73971.Docpti.gixrq.cn/04868.Docpti.gixrq.cn/51393.Docpti.gixrq.cn/17715.Docpti.gixrq.cn/75751.Docpti.gixrq.cn/91575.Docpti.gixrq.cn/31973.Docpti.gixrq.cn/75511.Docpti.gixrq.cn/66680.Docpti.gixrq.cn/88204.Docptu.gixrq.cn/15977.Docptu.gixrq.cn/24080.Docptu.gixrq.cn/71939.Docptu.gixrq.cn/79579.Docptu.gixrq.cn/86264.Docptu.gixrq.cn/55153.Docptu.gixrq.cn/15517.Docptu.gixrq.cn/95931.Docptu.gixrq.cn/62688.Docptu.gixrq.cn/97535.Docpty.gixrq.cn/71731.Docpty.gixrq.cn/08800.Docpty.gixrq.cn/55737.Docpty.gixrq.cn/91551.Docpty.gixrq.cn/79157.Docpty.gixrq.cn/79551.Docpty.gixrq.cn/99933.Docpty.gixrq.cn/95733.Docpty.gixrq.cn/37511.Docpty.gixrq.cn/33171.Docptt.gixrq.cn/11799.Docptt.gixrq.cn/57137.Docptt.gixrq.cn/57133.Docptt.gixrq.cn/55899.Docptt.gixrq.cn/19713.Docptt.gixrq.cn/72681.Docptt.gixrq.cn/11775.Docptt.gixrq.cn/88840.Docptt.gixrq.cn/73333.Docptt.gixrq.cn/99317.Docptr.gixrq.cn/71559.Docptr.gixrq.cn/66026.Docptr.gixrq.cn/80840.Docptr.gixrq.cn/93739.Docptr.gixrq.cn/14895.Docptr.gixrq.cn/97137.Docptr.gixrq.cn/33359.Docptr.gixrq.cn/44402.Docptr.gixrq.cn/95371.Docptr.gixrq.cn/51731.Docpte.gixrq.cn/95311.Docpte.gixrq.cn/66886.Docpte.gixrq.cn/11939.Docpte.gixrq.cn/37533.Docpte.gixrq.cn/19537.Docpte.gixrq.cn/31131.Docpte.gixrq.cn/99391.Docpte.gixrq.cn/06860.Docpte.gixrq.cn/35111.Docpte.gixrq.cn/09151.Docptw.gixrq.cn/25739.Docptw.gixrq.cn/82428.Docptw.gixrq.cn/35539.Docptw.gixrq.cn/66846.Docptw.gixrq.cn/80206.Docptw.gixrq.cn/33153.Docptw.gixrq.cn/20880.Docptw.gixrq.cn/39919.Docptw.gixrq.cn/53115.Docptw.gixrq.cn/51717.Docptq.gixrq.cn/95571.Docptq.gixrq.cn/20417.Docptq.gixrq.cn/80862.Docptq.gixrq.cn/73973.Docptq.gixrq.cn/71395.Docptq.gixrq.cn/33179.Docptq.gixrq.cn/73313.Docptq.gixrq.cn/95157.Docptq.gixrq.cn/40208.Docptq.gixrq.cn/91359.Docprm.gixrq.cn/37573.Docprm.gixrq.cn/15557.Docprm.gixrq.cn/68240.Docprm.gixrq.cn/82460.Docprm.gixrq.cn/91755.Docprm.gixrq.cn/73779.Docprm.gixrq.cn/84240.Docprm.gixrq.cn/26084.Docprm.gixrq.cn/13155.Docprm.gixrq.cn/93951.Doc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