Unverified Commit 2db8a948 authored by Christian Brauner's avatar Christian Brauner Committed by Christian Brauner (Microsoft)
Browse files

xattr: add listxattr helper 



Add a tiny helper to determine whether an xattr handler given a specific
dentry supports listing the requested xattr. We will use this helper in
various filesystems in later commits.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarChristian Brauner (Microsoft) <brauner@kernel.org>
parent f2620f16

include/linux/xattr.h

+16 −0
Original line number Diff line number Diff line
@@ -47,6 +47,22 @@ struct xattr_handler { 
		   size_t size, int flags);

};



/**

 * xattr_handler_can_list - check whether xattr can be listed

 * @handler: handler for this type of xattr

 * @dentry: dentry whose inode xattr to list

 *

 * Determine whether the xattr associated with @dentry can be listed given

 * @handler.

 *

 * Return: true if xattr can be listed, false if not.

 */

static inline bool xattr_handler_can_list(const struct xattr_handler *handler,

					  struct dentry *dentry)

{

	return handler && (!handler->list || handler->list(dentry));

}



const char *xattr_full_name(const struct xattr_handler *, const char *);



struct xattr {