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Commit e9f57e37 authored by Eric Biggers's avatar Eric Biggers Committed by Jaegeuk Kim
Browse files

fscrypt: new helper function - fscrypt_require_key() 



Add a helper function which checks if an inode is encrypted, and if so,
tries to set up its encryption key.  This is a pattern which is
duplicated in multiple places in each of ext4, f2fs, and ubifs --- for
example, when a regular file is asked to be opened or truncated.

Acked-by: default avatarDave Chinner <dchinner@redhat.com>
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent b31ee2e1

include/linux/fscrypt.h

+25 −0
Original line number Diff line number Diff line
@@ -152,5 +152,30 @@ static inline bool fscrypt_has_encryption_key(const struct inode *inode) 
#include <linux/fscrypt_notsupp.h>

#endif /* __FS_HAS_ENCRYPTION */



/**

 * 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;

}



#endif	/* _LINUX_FSCRYPT_H */