ocfs2: add ocfs2_check_acl

This function is used to enhance permission checking with POSIX ACLs.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

3 files changed, 27 insertions, 1 deletions

diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index 62d0faad600..a6a2bf6d684 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -230,6 +230,21 @@ static int ocfs2_set_acl(handle_t *handle,
         return ret;
 }
 
+int ocfs2_check_acl(struct inode *inode, int mask)
+{
+        struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
+
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        if (acl) {
+                int ret = posix_acl_permission(inode, acl, mask);
+                posix_acl_release(acl);
+                return ret;
+        }
+
+        return -EAGAIN;
+}
+
 static size_t ocfs2_xattr_list_acl_access(struct inode *inode,
                                           char *list,
                                           size_t list_len,
diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h
index 1b39f3e14c1..fef10f1b782 100644
--- a/fs/ocfs2/acl.h
+++ b/fs/ocfs2/acl.h
@@ -26,4 +26,14 @@ struct ocfs2_acl_entry {
         __le32 e_id;
 };
 
+#ifdef CONFIG_OCFS2_FS_POSIX_ACL
+
+extern int ocfs2_check_acl(struct inode *, int);
+
+#else /* CONFIG_OCFS2_FS_POSIX_ACL*/
+
+#define ocfs2_check_acl NULL
+
+#endif /* CONFIG_OCFS2_FS_POSIX_ACL*/
+
 #endif /* OCFS2_ACL_H */
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 360549161e2..7bad7d9b9a2 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -56,6 +56,7 @@
 #include "suballoc.h"
 #include "super.h"
 #include "xattr.h"
+#include "acl.h"
 
 #include "buffer_head_io.h"
 
@@ -1035,7 +1036,7 @@ int ocfs2_permission(struct inode *inode, int mask)
                 goto out;
         }
 
-        ret = generic_permission(inode, mask, NULL);
+        ret = generic_permission(inode, mask, ocfs2_check_acl);
 
         ocfs2_inode_unlock(inode, 0);
 out: