On Wed, May 21, 2025 at 09:53:31AM +0800, Qingfang Deng wrote:
From: Ian Kent raven@themaw.net
Commit 895adbec302e92086359e6fd92611ac3be6d92c3 upstream.
Add a revision counter to kernfs directory nodes so it can be used to detect if a directory node has changed during negative dentry revalidation.
There's an assumption that sizeof(unsigned long) <= sizeof(pointer) on all architectures and as far as I know that assumption holds.
So adding a revision counter to the struct kernfs_elem_dir variant of the kernfs_node type union won't increase the size of the kernfs_node struct. This is because struct kernfs_elem_dir is at least sizeof(pointer) smaller than the largest union variant. It's tempting to make the revision counter a u64 but that would increase the size of kernfs_node on archs where sizeof(pointer) is smaller than the revision counter.
Reviewed-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Ian Kent raven@themaw.net Link: https://lore.kernel.org/r/162642769895.63632.8356662784964509867.stgit@web.m... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
When forwarding on patches, you HAVE to sign off on them as well.
thanks,
greg k-h