mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
![Zhang, Yanmin](/assets/img/avatar_default.png)
Add definitions of USHORT_MAX and others into kernel. ipc uses it and slub implementation might also use it. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Cc: Nadia Derbey <Nadia.Derbey@bull.net> Cc: "Pierre Peiffer" <peifferp@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
163 lines
4.7 KiB
C
163 lines
4.7 KiB
C
/*
|
|
* linux/ipc/util.h
|
|
* Copyright (C) 1999 Christoph Rohland
|
|
*
|
|
* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
|
|
* namespaces support. 2006 OpenVZ, SWsoft Inc.
|
|
* Pavel Emelianov <xemul@openvz.org>
|
|
*/
|
|
|
|
#ifndef _IPC_UTIL_H
|
|
#define _IPC_UTIL_H
|
|
|
|
#include <linux/err.h>
|
|
|
|
#define SEQ_MULTIPLIER (IPCMNI)
|
|
|
|
void sem_init (void);
|
|
void msg_init (void);
|
|
void shm_init (void);
|
|
|
|
struct ipc_namespace;
|
|
|
|
void sem_init_ns(struct ipc_namespace *ns);
|
|
void msg_init_ns(struct ipc_namespace *ns);
|
|
void shm_init_ns(struct ipc_namespace *ns);
|
|
|
|
void sem_exit_ns(struct ipc_namespace *ns);
|
|
void msg_exit_ns(struct ipc_namespace *ns);
|
|
void shm_exit_ns(struct ipc_namespace *ns);
|
|
|
|
/*
|
|
* Structure that holds the parameters needed by the ipc operations
|
|
* (see after)
|
|
*/
|
|
struct ipc_params {
|
|
key_t key;
|
|
int flg;
|
|
union {
|
|
size_t size; /* for shared memories */
|
|
int nsems; /* for semaphores */
|
|
} u; /* holds the getnew() specific param */
|
|
};
|
|
|
|
/*
|
|
* Structure that holds some ipc operations. This structure is used to unify
|
|
* the calls to sys_msgget(), sys_semget(), sys_shmget()
|
|
* . routine to call to create a new ipc object. Can be one of newque,
|
|
* newary, newseg
|
|
* . routine to call to check permissions for a new ipc object.
|
|
* Can be one of security_msg_associate, security_sem_associate,
|
|
* security_shm_associate
|
|
* . routine to call for an extra check if needed
|
|
*/
|
|
struct ipc_ops {
|
|
int (*getnew) (struct ipc_namespace *, struct ipc_params *);
|
|
int (*associate) (struct kern_ipc_perm *, int);
|
|
int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *);
|
|
};
|
|
|
|
struct seq_file;
|
|
struct ipc_ids;
|
|
|
|
void ipc_init_ids(struct ipc_ids *);
|
|
#ifdef CONFIG_PROC_FS
|
|
void __init ipc_init_proc_interface(const char *path, const char *header,
|
|
int ids, int (*show)(struct seq_file *, void *));
|
|
#else
|
|
#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
|
|
#endif
|
|
|
|
#define IPC_SEM_IDS 0
|
|
#define IPC_MSG_IDS 1
|
|
#define IPC_SHM_IDS 2
|
|
|
|
#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER)
|
|
|
|
/* must be called with ids->rw_mutex acquired for writing */
|
|
int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
|
|
|
|
/* must be called with ids->rw_mutex acquired for reading */
|
|
int ipc_get_maxid(struct ipc_ids *);
|
|
|
|
/* must be called with both locks acquired. */
|
|
void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);
|
|
|
|
/* must be called with ipcp locked */
|
|
int ipcperms(struct kern_ipc_perm *ipcp, short flg);
|
|
|
|
/* for rare, potentially huge allocations.
|
|
* both function can sleep
|
|
*/
|
|
void* ipc_alloc(int size);
|
|
void ipc_free(void* ptr, int size);
|
|
|
|
/*
|
|
* For allocation that need to be freed by RCU.
|
|
* Objects are reference counted, they start with reference count 1.
|
|
* getref increases the refcount, the putref call that reduces the recount
|
|
* to 0 schedules the rcu destruction. Caller must guarantee locking.
|
|
*/
|
|
void* ipc_rcu_alloc(int size);
|
|
void ipc_rcu_getref(void *ptr);
|
|
void ipc_rcu_putref(void *ptr);
|
|
|
|
/*
|
|
* ipc_lock_down: called with rw_mutex held
|
|
* ipc_lock: called without that lock held
|
|
*/
|
|
struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *, int);
|
|
struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
|
|
|
|
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
|
|
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
|
|
void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
|
|
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
|
|
struct ipc64_perm *perm, int extra_perm);
|
|
|
|
#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
|
|
/* On IA-64, we always use the "64-bit version" of the IPC structures. */
|
|
# define ipc_parse_version(cmd) IPC_64
|
|
#else
|
|
int ipc_parse_version (int *cmd);
|
|
#endif
|
|
|
|
extern void free_msg(struct msg_msg *msg);
|
|
extern struct msg_msg *load_msg(const void __user *src, int len);
|
|
extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
|
|
|
|
extern void recompute_msgmni(struct ipc_namespace *);
|
|
|
|
static inline int ipc_buildid(int id, int seq)
|
|
{
|
|
return SEQ_MULTIPLIER * seq + id;
|
|
}
|
|
|
|
/*
|
|
* Must be called with ipcp locked
|
|
*/
|
|
static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
|
|
{
|
|
if (uid / SEQ_MULTIPLIER != ipcp->seq)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
|
|
{
|
|
rcu_read_lock();
|
|
spin_lock(&perm->lock);
|
|
}
|
|
|
|
static inline void ipc_unlock(struct kern_ipc_perm *perm)
|
|
{
|
|
spin_unlock(&perm->lock);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id);
|
|
struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);
|
|
int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
|
|
struct ipc_ops *ops, struct ipc_params *params);
|
|
|
|
#endif
|