cifs: on multiuser mount, set ownership to current_fsuid/current_fsgid (try #5)

...when unix extensions aren't enabled. This makes everything on the
mount appear to be owned by the current user.

This version of the patch differs from previous versions however in that
the admin can still force the ownership of all files to appear as a
single user via the uid=/gid= options.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index df29a3a3d80c..7e5b8c39a07a 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1755,11 +1755,21 @@ check_inval:
 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
         struct kstat *stat)
 {
+        struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
+        struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
         int err = cifs_revalidate_dentry(dentry);
+
         if (!err) {
                 generic_fillattr(dentry->d_inode, stat);
                 stat->blksize = CIFS_MAX_MSGSIZE;
                 stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
+                if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
+                    !tcon->unix_ext) {
+                        if (!cifs_sb->mnt_uid)
+                                stat->uid = current_fsuid();
+                        if (!cifs_sb->mnt_uid)
+                                stat->gid = current_fsgid();
+                }
         }
         return err;
 }