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Release 4.12 include/linux/ipc_namespace.h

Directory: include/linux
#ifndef __IPC_NAMESPACE_H__

#define __IPC_NAMESPACE_H__

#include <linux/err.h>
#include <linux/idr.h>
#include <linux/rwsem.h>
#include <linux/notifier.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>

struct user_namespace;

struct ipc_ids {
int in_use;
unsigned short seq;
struct rw_semaphore rwsem;
struct idr ipcs_idr;
int next_id;

struct ipc_namespace {
atomic_t	count;
struct ipc_ids	ids[3];

int		sem_ctls[4];
int		used_sems;

unsigned int	msg_ctlmax;
unsigned int	msg_ctlmnb;
unsigned int	msg_ctlmni;
atomic_t	msg_bytes;
atomic_t	msg_hdrs;

size_t		shm_ctlmax;
size_t		shm_ctlall;
unsigned long	shm_tot;
int		shm_ctlmni;
         * Defines whether IPC_RMID is forced for _all_ shm segments regardless
         * of shmctl()
int		shm_rmid_forced;

struct notifier_block ipcns_nb;

	/* The kern_mount of the mqueuefs sb.  We take a ref on it */
struct vfsmount	*mq_mnt;

	/* # queues in this ns, protected by mq_lock */
unsigned int    mq_queues_count;

	/* next fields are set through sysctl */
unsigned int    mq_queues_max;   /* initialized to DFLT_QUEUESMAX */
unsigned int    mq_msg_max;      /* initialized to DFLT_MSGMAX */
unsigned int    mq_msgsize_max;  /* initialized to DFLT_MSGSIZEMAX */
unsigned int    mq_msg_default;
unsigned int    mq_msgsize_default;

	/* user_ns which owns the ipc ns */
struct user_namespace *user_ns;
struct ucounts *ucounts;

struct ns_common ns;

extern struct ipc_namespace init_ipc_ns;
extern spinlock_t mq_lock;

extern void shm_destroy_orphaned(struct ipc_namespace *ns);
#else /* CONFIG_SYSVIPC */

static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}


Vasiliy Kulikov11100.00%1100.00%

#endif /* CONFIG_SYSVIPC */ #ifdef CONFIG_POSIX_MQUEUE extern int mq_init_ns(struct ipc_namespace *ns); /* * POSIX Message Queue default values: * * MIN_*: Lowest value an admin can set the maximum unprivileged limit to * DFLT_*MAX: Default values for the maximum unprivileged limits * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply * an attribute to the open call and the queue must be created * HARD_*: Highest value the maximums can be set to. These are enforced * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them * suitably high) * * POSIX Requirements: * Per app minimum openable message queues - 8. This does not map well * to the fact that we limit the number of queues on a per namespace * basis instead of a per app basis. So, make the default high enough * that no given app should have a hard time opening 8 queues. * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, * we have run into a situation where running applications in the wild * require this to be at least 5MB, and preferably 10MB, so I set the * value to 16MB in hopes that this user is the worst of the bunch and * the new maximum will handle anyone else. I may have to revisit this * in the future. */ #define DFLT_QUEUESMAX 256 #define MIN_MSGMAX 1 #define DFLT_MSG 10U #define DFLT_MSGMAX 10 #define HARD_MSGMAX 65536 #define MIN_MSGSIZEMAX 128 #define DFLT_MSGSIZE 8192U #define DFLT_MSGSIZEMAX 8192 #define HARD_MSGSIZEMAX (16*1024*1024) #else
static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }


Serge E. Hallyn15100.00%2100.00%

#endif #if defined(CONFIG_IPC_NS) extern struct ipc_namespace *copy_ipcs(unsigned long flags, struct user_namespace *user_ns, struct ipc_namespace *ns);
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) { if (ns) atomic_inc(&ns->count); return ns; }


Pavel Emelyanov2793.10%150.00%
Serge E. Hallyn26.90%150.00%

extern void put_ipc_ns(struct ipc_namespace *ns); #else
static inline struct ipc_namespace *copy_ipcs(unsigned long flags, struct user_namespace *user_ns, struct ipc_namespace *ns) { if (flags & CLONE_NEWIPC) return ERR_PTR(-EINVAL); return ns; }


Pavel Emelyanov3179.49%150.00%
Eric W. Biedermann820.51%150.00%

static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) { return ns; }


Pavel Emelyanov17100.00%1100.00%

static inline void put_ipc_ns(struct ipc_namespace *ns) { }


Pavel Emelyanov11100.00%1100.00%

#endif #ifdef CONFIG_POSIX_MQUEUE_SYSCTL struct ctl_table_header; extern struct ctl_table_header *mq_register_sysctl_table(void); #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
static inline struct ctl_table_header *mq_register_sysctl_table(void) { return NULL; }


Serge E. Hallyn14100.00%1100.00%

#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ #endif

Overall Contributors

Pavel Emelyanov18541.57%14.35%
Serge E. Hallyn13129.44%521.74%
Vasiliy Kulikov245.39%14.35%
Pierre Peiffer245.39%14.35%
Eric W. Biedermann214.72%313.04%
Doug Ledford214.72%313.04%
Nadia Derbey112.47%28.70%
Motohiro Kosaki112.47%28.70%
Al Viro61.35%14.35%
Robin Holt40.90%14.35%
Stanislav Kinsbursky30.67%14.35%
Mathias Krause30.67%14.35%
Davidlohr Bueso A10.22%14.35%
Directory: include/linux
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