cifs: revalidate mapping when we open files for SMB1 POSIX

RHBZ: 1933527

Under SMB1 + POSIX, if an inode is reused on a server after we have read and
cached a part of a file, when we then open the new file with the
re-cycled inode there is a chance that we may serve the old data out of cache
to the application.
This only happens for SMB1 (deprecated) and when posix are used.
The simplest solution to avoid this race is to force a revalidate
on smb1-posix open.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 26de4329d16158363b054e38464a13b19cb4d6d0..042e24aad41098ac29c92c7d837deb5b6c806e19 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -165,6 +165,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
                        goto posix_open_ret;
                }
        } else {
+               cifs_revalidate_mapping(*pinode);
                cifs_fattr_to_inode(*pinode, &fattr);
        }