| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Christian Brauner | 194 | 80.17% | 15 | 53.57% |
| Al Viro | 18 | 7.44% | 3 | 10.71% |
| Eric W. Biedermann | 10 | 4.13% | 2 | 7.14% |
| Aditya Kali | 7 | 2.89% | 1 | 3.57% |
| Kirill Korotaev | 4 | 1.65% | 2 | 7.14% |
| Andrey Vagin | 4 | 1.65% | 1 | 3.57% |
| Serge E. Hallyn | 3 | 1.24% | 2 | 7.14% |
| Greg Kroah-Hartman | 1 | 0.41% | 1 | 3.57% |
| Cédric Le Goater | 1 | 0.41% | 1 | 3.57% |
| Total | 242 | 28 |
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_NS_COMMON_TYPES_H #define _LINUX_NS_COMMON_TYPES_H #include <linux/atomic.h> #include <linux/ns/nstree_types.h> #include <linux/rbtree.h> #include <linux/refcount.h> #include <linux/types.h> struct cgroup_namespace; struct dentry; struct ipc_namespace; struct mnt_namespace; struct net; struct pid_namespace; struct proc_ns_operations; struct time_namespace; struct user_namespace; struct uts_namespace; extern struct cgroup_namespace init_cgroup_ns; extern struct ipc_namespace init_ipc_ns; extern struct mnt_namespace init_mnt_ns; extern struct net init_net; extern struct pid_namespace init_pid_ns; extern struct time_namespace init_time_ns; extern struct user_namespace init_user_ns; extern struct uts_namespace init_uts_ns; extern const struct proc_ns_operations cgroupns_operations; extern const struct proc_ns_operations ipcns_operations; extern const struct proc_ns_operations mntns_operations; extern const struct proc_ns_operations netns_operations; extern const struct proc_ns_operations pidns_operations; extern const struct proc_ns_operations pidns_for_children_operations; extern const struct proc_ns_operations timens_operations; extern const struct proc_ns_operations timens_for_children_operations; extern const struct proc_ns_operations userns_operations; extern const struct proc_ns_operations utsns_operations; /* * Namespace lifetimes are managed via a two-tier reference counting model: * * (1) __ns_ref (refcount_t): Main reference count tracking memory * lifetime. Controls when the namespace structure itself is freed. * It also pins the namespace on the namespace trees whereas (2) * only regulates their visibility to userspace. * * (2) __ns_ref_active (atomic_t): Reference count tracking active users. * Controls visibility of the namespace in the namespace trees. * Any live task that uses the namespace (via nsproxy or cred) holds * an active reference. Any open file descriptor or bind-mount of * the namespace holds an active reference. Once all tasks have * called exited their namespaces and all file descriptors and * bind-mounts have been released the active reference count drops * to zero and the namespace becomes inactive. IOW, the namespace * cannot be listed or opened via file handles anymore. * * Note that it is valid to transition from active to inactive and * back from inactive to active e.g., when resurrecting an inactive * namespace tree via the SIOCGSKNS ioctl(). * * Relationship and lifecycle states: * * - Active (__ns_ref_active > 0): * Namespace is actively used and visible to userspace. The namespace * can be reopened via /proc/<pid>/ns/<ns_type>, via namespace file * handles, or discovered via listns(). * * - Inactive (__ns_ref_active == 0, __ns_ref > 0): * No tasks are actively using the namespace and it isn't pinned by * any bind-mounts or open file descriptors anymore. But the namespace * is still kept alive by internal references. For example, the user * namespace could be pinned by an open file through file->f_cred * references when one of the now defunct tasks had opened a file and * handed the file descriptor off to another process via a UNIX * sockets. Such references keep the namespace structure alive through * __ns_ref but will not hold an active reference. * * - Destroyed (__ns_ref == 0): * No references remain. The namespace is removed from the tree and freed. * * State transitions: * * Active -> Inactive: * When the last task using the namespace exits it drops its active * references to all namespaces. However, user and pid namespaces * remain accessible until the task has been reaped. * * Inactive -> Active: * An inactive namespace tree might be resurrected due to e.g., the * SIOCGSKNS ioctl() on a socket. * * Inactive -> Destroyed: * When __ns_ref drops to zero the namespace is removed from the * namespaces trees and the memory is freed (after RCU grace period). * * Initial namespaces: * Boot-time namespaces (init_net, init_pid_ns, etc.) start with * __ns_ref_active = 1 and remain active forever. * * @ns_type: type of namespace (e.g., CLONE_NEWNET) * @stashed: cached dentry to be used by the vfs * @ops: namespace operations * @inum: namespace inode number (quickly recycled for non-initial namespaces) * @__ns_ref: main reference count (do not use directly) * @ns_tree: namespace tree nodes and active reference count */ struct ns_common { u32 ns_type; struct dentry *stashed; const struct proc_ns_operations *ops; unsigned int inum; refcount_t __ns_ref; /* do not use directly */ union { struct ns_tree; struct rcu_head ns_rcu; }; }; #define to_ns_common(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: &(__ns)->ns, \ const struct cgroup_namespace *: &(__ns)->ns, \ struct ipc_namespace *: &(__ns)->ns, \ const struct ipc_namespace *: &(__ns)->ns, \ struct mnt_namespace *: &(__ns)->ns, \ const struct mnt_namespace *: &(__ns)->ns, \ struct net *: &(__ns)->ns, \ const struct net *: &(__ns)->ns, \ struct pid_namespace *: &(__ns)->ns, \ const struct pid_namespace *: &(__ns)->ns, \ struct time_namespace *: &(__ns)->ns, \ const struct time_namespace *: &(__ns)->ns, \ struct user_namespace *: &(__ns)->ns, \ const struct user_namespace *: &(__ns)->ns, \ struct uts_namespace *: &(__ns)->ns, \ const struct uts_namespace *: &(__ns)->ns) #define ns_init_inum(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: CGROUP_NS_INIT_INO, \ struct ipc_namespace *: IPC_NS_INIT_INO, \ struct mnt_namespace *: MNT_NS_INIT_INO, \ struct net *: NET_NS_INIT_INO, \ struct pid_namespace *: PID_NS_INIT_INO, \ struct time_namespace *: TIME_NS_INIT_INO, \ struct user_namespace *: USER_NS_INIT_INO, \ struct uts_namespace *: UTS_NS_INIT_INO) #define ns_init_ns(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: &init_cgroup_ns, \ struct ipc_namespace *: &init_ipc_ns, \ struct mnt_namespace *: &init_mnt_ns, \ struct net *: &init_net, \ struct pid_namespace *: &init_pid_ns, \ struct time_namespace *: &init_time_ns, \ struct user_namespace *: &init_user_ns, \ struct uts_namespace *: &init_uts_ns) #define ns_init_id(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: CGROUP_NS_INIT_ID, \ struct ipc_namespace *: IPC_NS_INIT_ID, \ struct mnt_namespace *: MNT_NS_INIT_ID, \ struct net *: NET_NS_INIT_ID, \ struct pid_namespace *: PID_NS_INIT_ID, \ struct time_namespace *: TIME_NS_INIT_ID, \ struct user_namespace *: USER_NS_INIT_ID, \ struct uts_namespace *: UTS_NS_INIT_ID) #define to_ns_operations(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: (IS_ENABLED(CONFIG_CGROUPS) ? &cgroupns_operations : NULL), \ struct ipc_namespace *: (IS_ENABLED(CONFIG_IPC_NS) ? &ipcns_operations : NULL), \ struct mnt_namespace *: &mntns_operations, \ struct net *: (IS_ENABLED(CONFIG_NET_NS) ? &netns_operations : NULL), \ struct pid_namespace *: (IS_ENABLED(CONFIG_PID_NS) ? &pidns_operations : NULL), \ struct time_namespace *: (IS_ENABLED(CONFIG_TIME_NS) ? &timens_operations : NULL), \ struct user_namespace *: (IS_ENABLED(CONFIG_USER_NS) ? &userns_operations : NULL), \ struct uts_namespace *: (IS_ENABLED(CONFIG_UTS_NS) ? &utsns_operations : NULL)) #define ns_common_type(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: CLONE_NEWCGROUP, \ struct ipc_namespace *: CLONE_NEWIPC, \ struct mnt_namespace *: CLONE_NEWNS, \ struct net *: CLONE_NEWNET, \ struct pid_namespace *: CLONE_NEWPID, \ struct time_namespace *: CLONE_NEWTIME, \ struct user_namespace *: CLONE_NEWUSER, \ struct uts_namespace *: CLONE_NEWUTS) #endif /* _LINUX_NS_COMMON_TYPES_H */
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