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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 <[email protected]>
Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
This commit is contained in:
Eric Biggers 2017-10-09 12:15:43 -07:00 • committed by Theodore Ts'o
commit 32c3cf028e
4 changed files with 53 additions and 0 deletions
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18
fs/crypto/hooks.c
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@ -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);