kernfs: avoid iattr allocation in listxattr

kernfs_iop_listxattr() only needs to report existing xattrs, but it uses
kernfs_iattrs(), which allocates kernfs_iattrs when the node does not
have one yet.

This makes a query operation create persistent per-node metadata even
when the xattr list is empty.

Use kernfs_iattrs_noalloc() instead and return an empty list when no
iattrs exist.

Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://patch.msgid.link/20260731120554.630147-1-chenyichong@uniontech.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions