linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / ipc / util.c

diff --git a/ipc/util.c b/ipc/util.c
index 65efa37..3d4b5c1 100644 (file)
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -10,10 +10,9 @@
  *           Manfred Spraul <manfred@colorfullife.com>
  * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
  *            Mingming Cao <cmm@us.ibm.com>
- * Mar 2006 - support for audit of ipc object properties
- *            Dustin Kirkland <dustin.kirkland@us.ibm.com>
  */
 
+#include <linux/config.h>
 #include <linux/mm.h>
 #include <linux/shm.h>
 #include <linux/init.h>
@@ -28,7 +27,6 @@
 #include <linux/workqueue.h>
 #include <linux/seq_file.h>
 #include <linux/proc_fs.h>
-#include <linux/audit.h>
 
 #include <asm/unistd.h>
 
@@ -70,8 +68,7 @@ __initcall(ipc_init);
 void __init ipc_init_ids(struct ipc_ids* ids, int size)
 {
        int i;
-
-       mutex_init(&ids->mutex);
+       sema_init(&ids->sem,1);
 
        if(size > IPCMNI)
                size = IPCMNI;
@@ -141,7 +138,7 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
  *     @ids: Identifier set
  *     @key: The key to find
  *     
- *     Requires ipc_ids.mutex locked.
+ *     Requires ipc_ids.sem locked.
  *     Returns the identifier if found or -1 if not.
  */
  
@@ -153,7 +150,7 @@ int ipc_findkey(struct ipc_ids* ids, key_t key)
 
        /*
         * rcu_dereference() is not needed here
-        * since ipc_ids.mutex is held
+        * since ipc_ids.sem is held
         */
        for (id = 0; id <= max_id; id++) {
                p = ids->entries->p[id];
@@ -168,7 +165,7 @@ int ipc_findkey(struct ipc_ids* ids, key_t key)
 }
 
 /*
- * Requires ipc_ids.mutex locked
+ * Requires ipc_ids.sem locked
  */
 static int grow_ary(struct ipc_ids* ids, int newsize)
 {
@@ -214,7 +211,7 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
  *     is returned. The list is returned in a locked state on success.
  *     On failure the list is not locked and -1 is returned.
  *
- *     Called with ipc_ids.mutex held.
+ *     Called with ipc_ids.sem held.
  */
  
 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
@@ -225,7 +222,7 @@ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
 
        /*
         * rcu_dereference()() is not needed here since
-        * ipc_ids.mutex is held
+        * ipc_ids.sem is held
         */
        for (id = 0; id < size; id++) {
                if(ids->entries->p[id] == NULL)
@@ -261,7 +258,7 @@ found:
  *     fed an invalid identifier. The entry is removed and internal
  *     variables recomputed. The object associated with the identifier
  *     is returned.
- *     ipc_ids.mutex and the spinlock for this ID is hold before this function
+ *     ipc_ids.sem and the spinlock for this ID is hold before this function
  *     is called, and remain locked on the exit.
  */
  
@@ -269,15 +266,17 @@ struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id)
 {
        struct kern_ipc_perm* p;
        int lid = id % SEQ_MULTIPLIER;
-       BUG_ON(lid >= ids->entries->size);
+       if(lid >= ids->entries->size)
+               BUG();
 
        /* 
         * do not need a rcu_dereference()() here to force ordering
-        * on Alpha, since the ipc_ids.mutex is held.
+        * on Alpha, since the ipc_ids.sem is held.
         */     
        p = ids->entries->p[lid];
        ids->entries->p[lid] = NULL;
-       BUG_ON(p==NULL);
+       if(p==NULL)
+               BUG();
        ids->in_use--;
 
        if (lid == ids->max_id) {
@@ -468,10 +467,7 @@ void ipc_rcu_putref(void *ptr)
  
 int ipcperms (struct kern_ipc_perm *ipcp, short flag)
 {      /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
-       int requested_mode, granted_mode, err;
-
-       if (unlikely((err = audit_ipc_obj(ipcp))))
-               return err;
+       int requested_mode, granted_mode;
 
        if (!vx_check(ipcp->xid, VX_ADMIN|VX_IDENT)) /* maybe just VX_IDENT? */
                return -1;
@@ -537,13 +533,13 @@ void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out)
 
 /*
  * So far only shm_get_stat() calls ipc_get() via shm_get(), so ipc_get()
- * is called with shm_ids.mutex locked.  Since grow_ary() is also called with
- * shm_ids.mutex down(for Shared Memory), there is no need to add read
+ * is called with shm_ids.sem locked.  Since grow_ary() is also called with
+ * shm_ids.sem down(for Shared Memory), there is no need to add read 
  * barriers here to gurantee the writes in grow_ary() are seen in order 
  * here (for Alpha).
  *
- * However ipc_get() itself does not necessary require ipc_ids.mutex down. So
- * if in the future ipc_get() is used by other places without ipc_ids.mutex
+ * However ipc_get() itself does not necessary require ipc_ids.sem down. So
+ * if in the future ipc_get() is used by other places without ipc_ids.sem
  * down, then ipc_get() needs read memery barriers as ipc_lock() does.
  */
 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id)
@@ -674,7 +670,7 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
         * Take the lock - this will be released by the corresponding
         * call to stop().
         */
-       mutex_lock(&iface->ids->mutex);
+       down(&iface->ids->sem);
 
        /* pos < 0 is invalid */
        if (*pos < 0)
@@ -704,7 +700,7 @@ static void sysvipc_proc_stop(struct seq_file *s, void *it)
                ipc_unlock(ipc);
 
        /* Release the lock we took in start() */
-       mutex_unlock(&iface->ids->mutex);
+       up(&iface->ids->sem);
 }
 
 static int sysvipc_proc_show(struct seq_file *s, void *it)