posix_acl: Add set_posix_acl

Factor out part of posix_acl_xattr_set into a common function that takes
a posix_acl, which nfsd can also call.

The prototype already exists in include/linux/posix_acl.h.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Cc: stable@vger.kernel.org
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 8a4a266..edc452c 100644 (file)
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -820,39 +820,43 @@ posix_acl_xattr_get(const struct xattr_handler *handler,
        return error;
 }
 
-static int
-posix_acl_xattr_set(const struct xattr_handler *handler,
-                   struct dentry *unused, struct inode *inode,
-                   const char *name, const void *value,
-                   size_t size, int flags)
+int
+set_posix_acl(struct inode *inode, int type, struct posix_acl *acl)
 {
-       struct posix_acl *acl = NULL;
-       int ret;
-
        if (!IS_POSIXACL(inode))
                return -EOPNOTSUPP;
        if (!inode->i_op->set_acl)
                return -EOPNOTSUPP;
 
-       if (handler->flags == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
-               return value ? -EACCES : 0;
+       if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
+               return acl ? -EACCES : 0;
        if (!inode_owner_or_capable(inode))
                return -EPERM;
 
+       if (acl) {
+               int ret = posix_acl_valid(acl);
+               if (ret)
+                       return ret;
+       }
+       return inode->i_op->set_acl(inode, acl, type);
+}
+EXPORT_SYMBOL(set_posix_acl);
+
+static int
+posix_acl_xattr_set(const struct xattr_handler *handler,
+                   struct dentry *unused, struct inode *inode,
+                   const char *name, const void *value,
+                   size_t size, int flags)
+{
+       struct posix_acl *acl = NULL;
+       int ret;
+
        if (value) {
                acl = posix_acl_from_xattr(&init_user_ns, value, size);
                if (IS_ERR(acl))
                        return PTR_ERR(acl);
-
-               if (acl) {
-                       ret = posix_acl_valid(acl);
-                       if (ret)
-                               goto out;
-               }
        }
-
-       ret = inode->i_op->set_acl(inode, acl, handler->flags);
-out:
+       ret = set_posix_acl(inode, handler->flags, acl);
        posix_acl_release(acl);
        return ret;
 }