On Tue, Apr 09, 2019 at 04:35:44PM -0700, Eric Biggers wrote: > From: Eric Biggers <ebiggers@xxxxxxxxxx> > > Path lookups that traverse encrypted symlink(s) are very slow because > each encrypted symlink needs to be decrypted each time it's followed. > > Make encrypted symlinks faster by caching the decrypted symlink target > in ->i_link. The first call to ->get_link() sets it; later calls simply > return it. ->symlink() also sets it when the symlink is created. > > When the inode's ->i_crypt_info is freed, ->i_link is freed too. > > Note: RCU-delayed freeing of ->i_link is not yet implemented. > Therefore, for now even when ->i_link is set, path lookups must continue > to drop out of RCU-walk mode when following an encrypted symlink. And how the devil would they continue to do that, if I might ask? ->get_link() is *NOT* called if ->i_link is non-NULL, period.
