include/linux/sched/user.h

Source file repositories/reference/linux-study-clean/include/linux/sched/user.h

File Facts

System
Linux kernel
Corpus path
include/linux/sched/user.h
Extension
.h
Size
1564 bytes
Lines
57
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct user_struct {
	refcount_t __count;	/* reference count */
#ifdef CONFIG_EPOLL
	struct percpu_counter epoll_watches; /* The number of file descriptors currently watched */
#endif
	unsigned long unix_inflight;	/* How many files in flight in unix sockets */
	atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */

	/* Hash table maintenance information */
	struct hlist_node uidhash_node;
	kuid_t uid;

#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
	defined(CONFIG_NET) || defined(CONFIG_IO_URING) || \
	defined(CONFIG_VFIO_PCI_ZDEV_KVM) || IS_ENABLED(CONFIG_IOMMUFD)
	atomic_long_t locked_vm;
#endif
#ifdef CONFIG_WATCH_QUEUE
	atomic_t nr_watches;	/* The number of watches this user currently has */
#endif

	/* Miscellaneous per-user rate limit */
	struct ratelimit_state ratelimit;
};

extern int uids_sysfs_init(void);

extern struct user_struct *find_user(kuid_t);

extern struct user_struct root_user;
#define INIT_USER (&root_user)


/* per-UID process charging. */
extern struct user_struct * alloc_uid(kuid_t);
static inline struct user_struct *get_uid(struct user_struct *u)
{
	refcount_inc(&u->__count);
	return u;
}
extern void free_uid(struct user_struct *);

#endif /* _LINUX_SCHED_USER_H */

Annotation

Implementation Notes