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

Message ID 20170523003945.14279-2-ebiggers3@gmail.com
State Not Applicable
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 Y. 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
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Patch
diff mbox

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;