On Wed, 2020-09-23 at 22:47 -0700, Eric Biggers wrote: > From: Eric Biggers <ebiggers@xxxxxxxxxx> > > Dentries that represent no-key names must have a dentry_operations that > includes fscrypt_d_revalidate(). Currently, this is handled by > fscrypt_prepare_lookup() installing fscrypt_d_ops. > > However, ceph support for encryption > (https://lore.kernel.org/r/20200914191707.380444-1-jlayton@xxxxxxxxxx) > can't use fscrypt_d_ops, since ceph already has its own > dentry_operations. > > Similarly, ext4 and f2fs support for directories that are both encrypted > and casefolded > (https://lore.kernel.org/r/20200923010151.69506-1-drosen@xxxxxxxxxx) > can't use fscrypt_d_ops either, since casefolding requires some dentry > operations too. > > To satisfy both users, we need to move the responsibility of installing > the dentry_operations to filesystems. > > In preparation for this, export fscrypt_d_revalidate() and give it a > !CONFIG_FS_ENCRYPTION stub. > > Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> > --- > > Compared to the versions of this patch from Jeff and Daniel, I've > improved the commit message and added a !CONFIG_FS_ENCRYPTION stub, > which was missing. I'm planning to apply this for 5.10 in preparation > for both the ceph patchset and the encrypt+casefold patchset. > > > fs/crypto/fname.c | 3 ++- > include/linux/fscrypt.h | 7 +++++++ > 2 files changed, 9 insertions(+), 1 deletion(-) > > diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c > index c65979452844..1fbe6c24d705 100644 > --- a/fs/crypto/fname.c > +++ b/fs/crypto/fname.c > @@ -530,7 +530,7 @@ EXPORT_SYMBOL_GPL(fscrypt_fname_siphash); > * Validate dentries in encrypted directories to make sure we aren't potentially > * caching stale dentries after a key has been added. > */ > -static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) > +int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) > { > struct dentry *dir; > int err; > @@ -569,6 +569,7 @@ static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) > > return valid; > } > +EXPORT_SYMBOL_GPL(fscrypt_d_revalidate); > > const struct dentry_operations fscrypt_d_ops = { > .d_revalidate = fscrypt_d_revalidate, > diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h > index f1757e73162d..a8f7a43f031b 100644 > --- a/include/linux/fscrypt.h > +++ b/include/linux/fscrypt.h > @@ -197,6 +197,7 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode, > bool fscrypt_match_name(const struct fscrypt_name *fname, > const u8 *de_name, u32 de_name_len); > u64 fscrypt_fname_siphash(const struct inode *dir, const struct qstr *name); > +int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags); > > /* bio.c */ > void fscrypt_decrypt_bio(struct bio *bio); > @@ -454,6 +455,12 @@ static inline u64 fscrypt_fname_siphash(const struct inode *dir, > return 0; > } > > +static inline int fscrypt_d_revalidate(struct dentry *dentry, > + unsigned int flags) > +{ > + return 1; > +} > + > /* bio.c */ > static inline void fscrypt_decrypt_bio(struct bio *bio) > { Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
