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[1/4] ext4: don't bother checking for encryption key in ->mmap()

Message ID 20170523003945.14279-2-ebiggers3@gmail.com
State Deferred, archived
Delegated to: Richard Weinberger
Headers show

Commit Message

Eric Biggers May 23, 2017, 12:39 a.m. UTC 
From: Eric Biggers <ebiggers@google.com>

Since only an open file can be mmap'ed, and we only allow open()ing an
encrypted file when its key is available, there is no need to check for
the key again before permitting each mmap().

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/file.c | 7 -------
 1 file changed, 7 deletions(-)

Comments

Theodore Ts'o June 23, 2017, 11:46 p.m. UTC | #1 
On Mon, May 22, 2017 at 05:39:42PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> Since only an open file can be mmap'ed, and we only allow open()ing an
> encrypted file when its key is available, there is no need to check for
> the key again before permitting each mmap().
> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Thanks, applied.

					- Ted
diff mbox

Patch

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 831fd6beebf0..f0039867b086 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -345,13 +345,6 @@  static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 		return -EIO;
 
-	if (ext4_encrypted_inode(inode)) {
-		int err = fscrypt_get_encryption_info(inode);
-		if (err)
-			return 0;
-		if (!fscrypt_has_encryption_key(inode))
-			return -ENOKEY;
-	}
 	file_accessed(file);
 	if (IS_DAX(file_inode(file))) {
 		vma->vm_ops = &ext4_dax_vm_ops;