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authorEric Biggers <ebiggers@google.com>2020-12-02 18:20:39 -0800
committerEric Biggers <ebiggers@google.com>2020-12-02 18:25:01 -0800
commitde3cdc6e75179a2324c23400b21483a1372c95e1 (patch)
treea00447048b5f1a6b4e00bbc82d707ec21e7f5a89 /fs/crypto
parent7622350e5eda2cc57a72c6b27f1405d8b4f94670 (diff)
fscrypt: move fscrypt_require_key() to fscrypt_private.h
fscrypt_require_key() is now only used by files in fs/crypto/. So reduce its visibility to fscrypt_private.h. This is also a prerequsite for unexporting fscrypt_get_encryption_info(). Reviewed-by: Andreas Dilger <adilger@dilger.ca> Link: https://lore.kernel.org/r/20201203022041.230976-8-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/fscrypt_private.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index a61d4dbf0a0b..16dd55080127 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -571,6 +571,32 @@ int fscrypt_derive_dirhash_key(struct fscrypt_info *ci,
void fscrypt_hash_inode_number(struct fscrypt_info *ci,
const struct fscrypt_master_key *mk);
+/**
+ * fscrypt_require_key() - require an inode's encryption key
+ * @inode: the inode we need the key for
+ *
+ * If the inode is encrypted, set up its encryption key if not already done.
+ * Then require that the key be present and return -ENOKEY otherwise.
+ *
+ * No locks are needed, and the key will live as long as the struct inode --- so
+ * it won't go away from under you.
+ *
+ * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
+ * if a problem occurred while setting up the encryption key.
+ */
+static inline int fscrypt_require_key(struct inode *inode)
+{
+ if (IS_ENCRYPTED(inode)) {
+ int err = fscrypt_get_encryption_info(inode);
+
+ if (err)
+ return err;
+ if (!fscrypt_has_encryption_key(inode))
+ return -ENOKEY;
+ }
+ return 0;
+}
+
/* keysetup_v1.c */
void fscrypt_put_direct_key(struct fscrypt_direct_key *dk);