forked from mirrors/linux
38e1240862
lookups by descriptor are better off closer to syscall surface... Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* procfs namespace bits
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*/
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#ifndef _LINUX_PROC_NS_H
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#define _LINUX_PROC_NS_H
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#include <linux/ns_common.h>
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struct pid_namespace;
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struct nsset;
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struct path;
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struct task_struct;
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struct inode;
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struct proc_ns_operations {
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const char *name;
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const char *real_ns_name;
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int type;
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struct ns_common *(*get)(struct task_struct *task);
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void (*put)(struct ns_common *ns);
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int (*install)(struct nsset *nsset, struct ns_common *ns);
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struct user_namespace *(*owner)(struct ns_common *ns);
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struct ns_common *(*get_parent)(struct ns_common *ns);
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} __randomize_layout;
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extern const struct proc_ns_operations netns_operations;
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extern const struct proc_ns_operations utsns_operations;
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extern const struct proc_ns_operations ipcns_operations;
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extern const struct proc_ns_operations pidns_operations;
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extern const struct proc_ns_operations pidns_for_children_operations;
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extern const struct proc_ns_operations userns_operations;
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extern const struct proc_ns_operations mntns_operations;
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extern const struct proc_ns_operations cgroupns_operations;
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extern const struct proc_ns_operations timens_operations;
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extern const struct proc_ns_operations timens_for_children_operations;
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/*
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* We always define these enumerators
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*/
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enum {
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PROC_ROOT_INO = 1,
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PROC_IPC_INIT_INO = 0xEFFFFFFFU,
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PROC_UTS_INIT_INO = 0xEFFFFFFEU,
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PROC_USER_INIT_INO = 0xEFFFFFFDU,
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PROC_PID_INIT_INO = 0xEFFFFFFCU,
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PROC_CGROUP_INIT_INO = 0xEFFFFFFBU,
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PROC_TIME_INIT_INO = 0xEFFFFFFAU,
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};
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#ifdef CONFIG_PROC_FS
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extern int proc_alloc_inum(unsigned int *pino);
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extern void proc_free_inum(unsigned int inum);
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#else /* CONFIG_PROC_FS */
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static inline int proc_alloc_inum(unsigned int *inum)
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{
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*inum = 1;
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return 0;
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}
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static inline void proc_free_inum(unsigned int inum) {}
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#endif /* CONFIG_PROC_FS */
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static inline int ns_alloc_inum(struct ns_common *ns)
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{
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atomic_long_set(&ns->stashed, 0);
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return proc_alloc_inum(&ns->inum);
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}
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#define ns_free_inum(ns) proc_free_inum((ns)->inum)
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#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
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extern int ns_get_path(struct path *path, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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typedef struct ns_common *ns_get_path_helper_t(void *);
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extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
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void *private_data);
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extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
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extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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extern void nsfs_init(void);
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#endif /* _LINUX_PROC_NS_H */
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