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fscrypt: introduce fscrypt_needs_contents_encryption()

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Add a function fscrypt_needs_contents_encryption() which takes an inode
and returns true if it's an encrypted regular file and the kernel was
built with fscrypt support.

This will allow replacing duplicated checks of IS_ENCRYPTED() &&
S_ISREG() on the I/O paths in ext4 and f2fs, while also optimizing out
unneeded code when !CONFIG_FS_ENCRYPTION.

Link: https://lore.kernel.org/r/20191209205021.231767-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2019-12-09 12:50:21 -08:00
parent 2ebdef6d8c
commit 56dce71795
1 changed files with 20 additions and 0 deletions
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20
include/linux/fscrypt.h
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@ -72,6 +72,21 @@ static inline bool fscrypt_has_encryption_key(const struct inode *inode)
return READ_ONCE(inode->i_crypt_info) != NULL;
}
/**
* fscrypt_needs_contents_encryption() - check whether an inode needs
* contents encryption
*
* Return: %true iff the inode is an encrypted regular file and the kernel was
* built with fscrypt support.
*
* If you need to know whether the encrypt bit is set even when the kernel was
* built without fscrypt support, you must use IS_ENCRYPTED() directly instead.
*/
static inline bool fscrypt_needs_contents_encryption(const struct inode *inode)
{
return IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode);
}
static inline bool fscrypt_dummy_context_enabled(struct inode *inode)
{
return inode->i_sb->s_cop->dummy_context &&
@ -269,6 +284,11 @@ static inline bool fscrypt_has_encryption_key(const struct inode *inode)
return false;
}
static inline bool fscrypt_needs_contents_encryption(const struct inode *inode)
{
return false;
}
static inline bool fscrypt_dummy_context_enabled(struct inode *inode)
{
return false;