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authorMichael Halcrow <mhalcrow@us.ibm.com>2007-02-12 00:53:47 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-12 09:48:36 -0800
commite77a56ddceeec87575a13a60fc1a394af6a1f4bc (patch)
tree8be21cc4afbc0596716bc9d4d8dd145dd8c74252 /fs/ecryptfs/inode.c
parentdd2a3b7ad98f8482cae481cad89dfed5eee48365 (diff)
[PATCH] eCryptfs: Encrypted passthrough
Provide an option to provide a view of the encrypted files such that the metadata is always in the header of the files, regardless of whether the metadata is actually in the header or in the extended attribute. This mode of operation is useful for applications like incremental backup utilities that do not preserve the extended attributes when directly accessing the lower files. With this option enabled, the files under the eCryptfs mount point will be read-only. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ecryptfs/inode.c')
-rw-r--r--fs/ecryptfs/inode.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 6b45b2908f17..bbc1b4f666fe 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -289,6 +289,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
char *encoded_name;
unsigned int encoded_namelen;
struct ecryptfs_crypt_stat *crypt_stat = NULL;
+ struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
char *page_virt = NULL;
struct inode *lower_inode;
u64 file_size;
@@ -388,8 +389,18 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
}
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
}
- memcpy(&file_size, page_virt, sizeof(file_size));
- file_size = be64_to_cpu(file_size);
+ mount_crypt_stat = &ecryptfs_superblock_to_private(
+ dentry->d_sb)->mount_crypt_stat;
+ if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
+ if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
+ file_size = (crypt_stat->header_extent_size
+ + i_size_read(lower_dentry->d_inode));
+ else
+ file_size = i_size_read(lower_dentry->d_inode);
+ } else {
+ memcpy(&file_size, page_virt, sizeof(file_size));
+ file_size = be64_to_cpu(file_size);
+ }
i_size_write(dentry->d_inode, (loff_t)file_size);
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
goto out;