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fscrypt: Add in-place encryption mode

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ext4 and f2fs require a bounce page when encrypting pages. However, not
all filesystems will need that (eg. UBIFS). This is handled via a
flag on fscrypt_operations where a fs implementation can select in-place
encryption over using a bounce page (which is the default).

Signed-off-by: David Gstir <david@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
David Gstir
2016-11-13 22:20:44 +01:00
committed by Theodore Ts'o
parent bc33b0ca11
commit 1c7dcf69ee
2 changed files with 21 additions and 10 deletions
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6
include/linux/fscrypto.h
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@@ -153,10 +153,16 @@ struct fscrypt_name {
#define fname_name(p) ((p)->disk_name.name)
#define fname_len(p) ((p)->disk_name.len)
/*
* fscrypt superblock flags
*/
#define FS_CFLG_INPLACE_ENCRYPTION (1U << 1)
/*
* crypto opertions for filesystems
*/
struct fscrypt_operations {
unsigned int flags;
int (*get_context)(struct inode *, void *, size_t);
int (*key_prefix)(struct inode *, u8 **);
int (*prepare_context)(struct inode *);