idr: create idr_layer_cache at boot time

[linux-2.6] / include / linux / msg.h

diff --git a/include/linux/msg.h b/include/linux/msg.h
index 903e0ab8101fad230721c7ecd27653b413a5d058..6f3b8e79a9912c0aa4a5d06e1d07742387fd1346 100644 (file)
--- a/include/linux/msg.h
+++ b/include/linux/msg.h
@@ -2,7 +2,6 @@
 #define _LINUX_MSG_H
 
 #include <linux/ipc.h>
-#include <linux/list.h>
 
 /* ipcs ctl commands */
 #define MSG_STAT 11
@@ -50,19 +49,30 @@ struct msginfo {
        unsigned short  msgseg; 
 };
 
+/*
+ * Scaling factor to compute msgmni:
+ * the memory dedicated to msg queues (msgmni * msgmnb) should occupy
+ * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c):
+ * up to 8MB       : msgmni = 16 (MSGMNI)
+ * 4 GB            : msgmni = 8K
+ * more than 16 GB : msgmni = 32K (IPCMNI)
+ */
+#define MSG_MEM_SCALE 32
+
 #define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
 #define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
 #define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
 
 /* unused */
-#define MSGPOOL (MSGMNI*MSGMNB/1024)  /* size in kilobytes of message pool */
+#define MSGPOOL (MSGMNI * MSGMNB) /* size in bytes of message pool */
 #define MSGTQL  MSGMNB            /* number of system message headers */
 #define MSGMAP  MSGMNB            /* number of entries in message map */
 #define MSGSSZ  16                /* message segment size */
-#define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
+#define __MSGSEG (MSGPOOL / MSGSSZ) /* max no. of segments */
 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
 
 #ifdef __KERNEL__
+#include <linux/list.h>
 
 /* one msg_msg structure for each message */
 struct msg_msg {
@@ -77,7 +87,6 @@ struct msg_msg {
 /* one msq_queue structure for each present queue on the system */
 struct msg_queue {
        struct kern_ipc_perm q_perm;
-       int q_id;
        time_t q_stime;                 /* last msgsnd time */
        time_t q_rtime;                 /* last msgrcv time */
        time_t q_ctime;                 /* last change time */
@@ -92,6 +101,12 @@ struct msg_queue {
        struct list_head q_senders;
 };
 
+/* Helper routines for sys_msgsnd and sys_msgrcv */
+extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
+                       size_t msgsz, int msgflg);
+extern long do_msgrcv(int msqid, long *pmtype, void __user *mtext,
+                       size_t msgsz, long msgtyp, int msgflg);
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_MSG_H */