On Fri, 2024-02-23 at 12:25 -0500, Stefan Berger wrote: > Changes to file attributes (mode bits, uid, gid) on the lower layer are > not taken into account when d_backing_inode() is used when a file is > accessed on the overlay layer and this file has not yet been copied up. > This is because d_backing_inode() does not return the real inode of the > lower layer but instead returns the backing inode which in this case > holds wrong file attributes. Further, when CONFIG_OVERLAY_FS_METACOPY is > enabled and a copy-up is triggered due to file metadata changes, then > the metadata are held by the backing inode while the data are still held > by the real inode. Therefore, use d_inode(d_real(dentry, D_REAL_METADATA)) > to get to the file's metadata inode and use it to calculate the metadata > hash with. > > Co-developed-by: Mimi Zohar <zohar@xxxxxxxxxxxxx> > Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx> > Acked-by: Amir Goldstein <amir73il@xxxxxxxxx> Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
