fs: take the ACL checks to common code

Replace the ->check_acl method with a ->get_acl method that simply reads an
ACL from disk after having a cache miss.  This means we can replace the ACL
checking boilerplate code with a single implementation in namei.c.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 13 insertions, 11 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 120efc76d3d..ec2e5656b44 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -196,20 +196,22 @@ static int check_acl(struct inode *inode, int mask)
 	acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
 
 	/*
-	 * A filesystem can force a ACL callback by just never
-	 * filling the ACL cache. But normally you'd fill the
-	 * cache either at inode instantiation time, or on the
-	 * first ->check_acl call.
+	 * A filesystem can force a ACL callback by just never filling the
+	 * ACL cache. But normally you'd fill the cache either at inode
+	 * instantiation time, or on the first ->get_acl call.
 	 *
-	 * If the filesystem doesn't have a check_acl() function
-	 * at all, we'll just create the negative cache entry.
+	 * If the filesystem doesn't have a get_acl() function at all, we'll
+	 * just create the negative cache entry.
 	 */
 	if (acl == ACL_NOT_CACHED) {
-	        if (inode->i_op->check_acl)
-	                return inode->i_op->check_acl(inode, mask);
-
-	        set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
-	        return -EAGAIN;
+	        if (inode->i_op->get_acl) {
+			acl = inode->i_op->get_acl(inode, ACL_TYPE_ACCESS);
+			if (IS_ERR(acl))
+				return PTR_ERR(acl);
+		} else {
+		        set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
+		        return -EAGAIN;
+		}
 	}
 
 	if (acl) {