[CIFS] when not using unix extensions, check for and set ATTR_READONLY on create and mkdir

When creating a directory on a CIFS share without POSIX extensions,
and the given mode has no write bits set, set the ATTR_READONLY bit.

When creating a file, set ATTR_READONLY if the create mode has no write
bits set and we're not using unix extensions.

There are some comments about this being problematic due to the VFS
splitting creates into 2 parts. I'm not sure what that's actually
talking about, but I'm assuming that it has something to do with how
mknod is implemented. In the simple case where we have no unix
extensions and we're just creating a regular file, there's no reason
we can't set ATTR_READONLY.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index d904a037c833..fcbdbb6ad7bf 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -974,8 +974,8 @@ mkdir_get_info:
                   * failed to get it from the server or was set bogus */
                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
                                 direntry->d_inode->i_nlink = 2;
+                mode &= ~current->fs->umask;
                 if (pTcon->unix_ext) {
-                        mode &= ~current->fs->umask;
                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
                                                     mode,
@@ -994,9 +994,16 @@ mkdir_get_info:
                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
                         }
                 } else {
-                        /* BB to be implemented via Windows secrty descriptors
-                           eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
-                                                 -1, -1, local_nls); */
+                        if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
+                            (mode & S_IWUGO) == 0) {
+                                FILE_BASIC_INFO pInfo;
+                                memset(&pInfo, 0, sizeof(pInfo));
+                                pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
+                                CIFSSMBSetTimes(xid, pTcon, full_path,
+                                                &pInfo, cifs_sb->local_nls,
+                                                cifs_sb->mnt_cifs_flags &
+                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
+                        }
                         if (direntry->d_inode) {
                                 direntry->d_inode->i_mode = mode;
                                 direntry->d_inode->i_mode |= S_IFDIR;