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fscrypt: new helper function - fscrypt_prepare_lookup()

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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>
This commit is contained in:
Eric Biggers
2017-10-09 12:15:43 -07:00
committed by Theodore Ts'o
parent 94b26f3672
commit 32c3cf028e
4 changed files with 53 additions and 0 deletions
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6
include/linux/fscrypt_notsupp.h
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@@ -201,4 +201,10 @@ static inline int __fscrypt_prepare_rename(struct inode *old_dir,
return -EOPNOTSUPP;
}
static inline int __fscrypt_prepare_lookup(struct inode *dir,
struct dentry *dentry)
{
return -EOPNOTSUPP;
}
#endif /* _LINUX_FSCRYPT_NOTSUPP_H */