ext4 crypto: implement the ext4 decryption read path
Signed-off-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Ildar Muslukhov <ildarm@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index fcc6c13..b132a3c 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -218,6 +218,13 @@
static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
{
+ struct inode *inode = file->f_mapping->host;
+
+ if (ext4_encrypted_inode(inode)) {
+ int err = ext4_generate_encryption_key(inode);
+ if (err)
+ return 0;
+ }
file_accessed(file);
if (IS_DAX(file_inode(file))) {
vma->vm_ops = &ext4_dax_vm_ops;
@@ -235,6 +242,7 @@
struct vfsmount *mnt = filp->f_path.mnt;
struct path path;
char buf[64], *cp;
+ int ret;
if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
!(sb->s_flags & MS_RDONLY))) {
@@ -273,11 +281,17 @@
* writing and the journal is present
*/
if (filp->f_mode & FMODE_WRITE) {
- int ret = ext4_inode_attach_jinode(inode);
+ ret = ext4_inode_attach_jinode(inode);
if (ret < 0)
return ret;
}
- return dquot_file_open(inode, filp);
+ ret = dquot_file_open(inode, filp);
+ if (!ret && ext4_encrypted_inode(inode)) {
+ ret = ext4_generate_encryption_key(inode);
+ if (ret)
+ ret = -EACCES;
+ }
+ return ret;
}
/*