IMA: drop the inode opencount since it isn't needed for operation

The opencount was used to help debugging to make sure that everything
which created a struct file also correctly made the IMA calls.  Since we
moved all of that into the VFS this isn't as necessary.  We should be
able to get the same amount of debugging out of just the reader and
write count.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NMimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

security/integrity/ima/ima.h

@@ -108,7 +108,6 @@ struct ima_iint_cache {
 	struct mutex mutex;	/* protects: version, flags, digest */
 	long readcount;		/* measured files readcount */
 	long writecount;	/* measured files writecount */
-	long opencount;		/* opens reference count */
 	struct kref refcount;	/* ima_iint_cache reference count */
 };
 

security/integrity/ima/ima_iint.c

@@ -134,11 +134,6 @@ void iint_free(struct kref *kref)
 		       iint->writecount);
 		iint->writecount = 0;
 	}
-	if (iint->opencount != 0) {
-		printk(KERN_INFO "%s: opencount: %ld\n", __func__,
-		       iint->opencount);
-		iint->opencount = 0;
-	}
 	kref_init(&iint->refcount);
 	kmem_cache_free(iint_cache, iint);
 }
@@ -172,7 +167,6 @@ static void init_once(void *foo)
 	mutex_init(&iint->mutex);
 	iint->readcount = 0;
 	iint->writecount = 0;
-	iint->opencount = 0;
 	kref_init(&iint->refcount);
 }
 

security/integrity/ima/ima_main.c

@@ -122,7 +122,6 @@ static void ima_inc_counts(struct ima_iint_cache *iint, fmode_t mode)
 {
 	BUG_ON(!mutex_is_locked(&iint->mutex));
 
-	iint->opencount++;
 	if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
 		iint->readcount++;
 	if (mode & FMODE_WRITE)
@@ -181,7 +180,6 @@ static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode,
 	mode_t mode = file->f_mode;
 	BUG_ON(!mutex_is_locked(&iint->mutex));
 
-	iint->opencount--;
 	if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
 		iint->readcount--;
 	if (mode & FMODE_WRITE) {
@@ -192,13 +190,11 @@ static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode,
 		}
 	}
 
-	if (((iint->opencount < 0) ||
-	     (iint->readcount < 0) ||
+	if (((iint->readcount < 0) ||
 	     (iint->writecount < 0)) &&
 	    !ima_limit_imbalance(file)) {
-		printk(KERN_INFO "%s: open/free imbalance (r:%ld w:%ld o:%ld)\n",
-		       __func__, iint->readcount, iint->writecount,
-		       iint->opencount);
+		printk(KERN_INFO "%s: open/free imbalance (r:%ld w:%ld)\n",
+		       __func__, iint->readcount, iint->writecount);
 		dump_stack();
 	}
 }