Christoph, Am 23.05.2017 um 10:37 schrieb Christoph Hellwig: > On Sun, May 21, 2017 at 10:20:49PM +0200, Richard Weinberger wrote: >> The new feature UBIFS_FLG_PARENTPOINTER allows looking >> up the parent. Usually the Linux VFS walks down the filesystem >> and no parent pointers are needed. But when a filesystem >> is exportable via NFS such a lookup is needed. >> We can use a padding field in struct ubifs_ino_node to >> maintain a pointer to the parent inode. > > Note that nfsd/exportfs will only do this for directories, and beacause > we hardlinks for other objects that is an important distinction. > > I think the ubifs code should make sure to only maintain the parent > pointers for directories, otherwise confusion and abuses will happen. Thanks for the info, I'll massage the code in that direction. Thanks, //richard
