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authorEric Biggers <ebiggers@google.com>2017-10-09 22:15:43 +0300
committerTheodore Ts'o <tytso@mit.edu>2017-10-19 02:52:38 +0300
commit32c3cf028e747d1e9cf0679b16dcbe3794fe4853 (patch)
tree812ab8801463d63ae0f41ced67168817988b6b9f /fs/crypto
parent94b26f3672a0e41025104c7e46943917544e1c87 (diff)
downloadlinux-32c3cf028e747d1e9cf0679b16dcbe3794fe4853.tar.xz
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 <dchinner@redhat.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/hooks.c18
1 files changed, 18 insertions, 0 deletions
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);