From 32c3cf028e747d1e9cf0679b16dcbe3794fe4853 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Mon, 9 Oct 2017 12:15:43 -0700 Subject: fscrypt: new helper function - fscrypt_prepare_lookup() Introduce a helper function which prepares to look up the given dentry in the given directory. If the directory is encrypted, it handles loading the directory's encryption key, setting the dentry's ->d_op to fscrypt_d_ops, and setting DCACHE_ENCRYPTED_WITH_KEY if the directory's encryption key is available. Note: once all filesystems switch over to this, we'll be able to move fscrypt_d_ops and fscrypt_set_encrypted_dentry() to fscrypt_private.h. Acked-by: Dave Chinner Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o --- fs/crypto/hooks.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'fs/crypto/hooks.c') diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c index 822cb78f9b45..9f5fb2eb9cf7 100644 --- a/fs/crypto/hooks.c +++ b/fs/crypto/hooks.c @@ -92,3 +92,21 @@ int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry, return 0; } EXPORT_SYMBOL_GPL(__fscrypt_prepare_rename); + +int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry) +{ + int err = fscrypt_get_encryption_info(dir); + + if (err) + return err; + + if (fscrypt_has_encryption_key(dir)) { + spin_lock(&dentry->d_lock); + dentry->d_flags |= DCACHE_ENCRYPTED_WITH_KEY; + spin_unlock(&dentry->d_lock); + } + + d_set_d_op(dentry, &fscrypt_d_ops); + return 0; +} +EXPORT_SYMBOL_GPL(__fscrypt_prepare_lookup); -- cgit v1.2.3