diff options
Diffstat (limited to 'ipc/util.h')
| -rw-r--r-- | ipc/util.h | 68 |
1 files changed, 45 insertions, 23 deletions
diff --git a/ipc/util.h b/ipc/util.h index d768fdbed515..0fcf8e719b76 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -15,8 +15,37 @@ #include <linux/err.h> #include <linux/ipc_namespace.h> -#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ -#define SEQ_MULTIPLIER (IPCMNI) +/* + * The IPC ID contains 2 separate numbers - index and sequence number. + * By default, + * bits 0-14: index (32k, 15 bits) + * bits 15-30: sequence number (64k, 16 bits) + * + * When IPCMNI extension mode is turned on, the composition changes: + * bits 0-23: index (16M, 24 bits) + * bits 24-30: sequence number (128, 7 bits) + */ +#define IPCMNI_SHIFT 15 +#define IPCMNI_EXTEND_SHIFT 24 +#define IPCMNI_EXTEND_MIN_CYCLE (RADIX_TREE_MAP_SIZE * RADIX_TREE_MAP_SIZE) +#define IPCMNI (1 << IPCMNI_SHIFT) +#define IPCMNI_EXTEND (1 << IPCMNI_EXTEND_SHIFT) + +#ifdef CONFIG_SYSVIPC_SYSCTL +extern int ipc_mni; +extern int ipc_mni_shift; +extern int ipc_min_cycle; + +#define ipcmni_seq_shift() ipc_mni_shift +#define IPCMNI_IDX_MASK ((1 << ipc_mni_shift) - 1) + +#else /* CONFIG_SYSVIPC_SYSCTL */ + +#define ipc_mni IPCMNI +#define ipc_min_cycle ((int)RADIX_TREE_MAP_SIZE) +#define ipcmni_seq_shift() IPCMNI_SHIFT +#define IPCMNI_IDX_MASK ((1 << IPCMNI_SHIFT) - 1) +#endif /* CONFIG_SYSVIPC_SYSCTL */ void sem_init(void); void msg_init(void); @@ -96,9 +125,9 @@ struct pid_namespace *ipc_seq_pid_ns(struct seq_file *); #define IPC_MSG_IDS 1 #define IPC_SHM_IDS 2 -#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER) -#define ipcid_to_seqx(id) ((id) / SEQ_MULTIPLIER) -#define IPCID_SEQ_MAX min_t(int, INT_MAX/SEQ_MULTIPLIER, USHRT_MAX) +#define ipcid_to_idx(id) ((id) & IPCMNI_IDX_MASK) +#define ipcid_to_seqx(id) ((id) >> ipcmni_seq_shift()) +#define ipcid_seq_max() (INT_MAX >> ipcmni_seq_shift()) /* must be called with ids->rwsem acquired for writing */ int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int); @@ -123,8 +152,8 @@ static inline int ipc_get_maxidx(struct ipc_ids *ids) if (ids->in_use == 0) return -1; - if (ids->in_use == IPCMNI) - return IPCMNI - 1; + if (ids->in_use == ipc_mni) + return ipc_mni - 1; return ids->max_idx; } @@ -160,10 +189,7 @@ static inline void ipc_update_pid(struct pid **pos, struct pid *pid) } } -#ifndef CONFIG_ARCH_WANT_IPC_PARSE_VERSION -/* On IA-64, we always use the "64-bit version" of the IPC structures. */ -# define ipc_parse_version(cmd) IPC_64 -#else +#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION int ipc_parse_version(int *cmd); #endif @@ -219,10 +245,10 @@ void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, static inline int sem_check_semmni(struct ipc_namespace *ns) { /* - * Check semmni range [0, IPCMNI] + * Check semmni range [0, ipc_mni] * semmni is the last element of sem_ctls[4] array */ - return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > IPCMNI)) + return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > ipc_mni)) ? -ERANGE : 0; } @@ -246,13 +272,9 @@ int get_compat_ipc64_perm(struct ipc64_perm *, static inline int compat_ipc_parse_version(int *cmd) { -#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION int version = *cmd & IPC_64; *cmd &= ~IPC_64; return version; -#else - return IPC_64; -#endif } #endif @@ -261,29 +283,29 @@ long ksys_semtimedop(int semid, struct sembuf __user *tsops, unsigned int nsops, const struct __kernel_timespec __user *timeout); long ksys_semget(key_t key, int nsems, int semflg); -long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg); +long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg); long ksys_msgget(key_t key, int msgflg); -long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf); +long ksys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf); long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, long msgtyp, int msgflg); long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg); long ksys_shmget(key_t key, size_t size, int shmflg); long ksys_shmdt(char __user *shmaddr); -long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf); +long ksys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf); /* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */ long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems, unsigned int nsops, const struct old_timespec32 __user *timeout); #ifdef CONFIG_COMPAT -long compat_ksys_semctl(int semid, int semnum, int cmd, int arg); -long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr); +long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg); +long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr); long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg); long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz, int msgflg); -long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr); +long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr); #endif /* CONFIG_COMPAT */ #endif |