[tip: efi/urgent] efivarfs: Update inode modification time for successful writes

[tip-bot2 for Tony Luck]

The following commit has been merged into the efi/urgent branch of tip:

Commit-ID:     2096721f1577b51b574fa06a7d91823dffe7267a
Gitweb:        https://git.kernel.org/tip/2096721f1577b51b574fa06a7d91823dffe7267a
Author:        Tony Luck <tony.luck@xxxxxxxxx>
AuthorDate:    Thu, 28 May 2020 12:49:04 -07:00
Committer:     Ard Biesheuvel <ardb@xxxxxxxxxx>
CommitterDate: Mon, 15 Jun 2020 14:38:56 +02:00

efivarfs: Update inode modification time for successful writes

Some applications want to be able to see when EFI variables
have been updated.

Update the modification time for successful writes.

Reported-by: Lennart Poettering <mzxreary@xxxxxxxxxxx>
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Link: https://lore.kernel.org/r/20200528194905.690-2-tony.luck@xxxxxxxxx
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
---
 fs/efivarfs/file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c
index e9e27a2..4b8bc45 100644
--- a/fs/efivarfs/file.c
+++ b/fs/efivarfs/file.c
@@ -51,6 +51,7 @@ static ssize_t efivarfs_file_write(struct file *file,
 	} else {
 		inode_lock(inode);
 		i_size_write(inode, datasize + sizeof(attributes));
+		inode->i_mtime = current_time(inode);
 		inode_unlock(inode);
 	}