From 5e462ec4eb77a087383a384d2067d04e0b6d0621 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 30 Jan 2010 16:11:21 -0500 Subject: [PATCH] fix NFS4 handling of mountpoint stat commit 462d60577a997aa87c935ae4521bd303733a9f2b upstream. RFC says we need to follow the chain of mounts if there's more than one stacked on that point. Signed-off-by: Al Viro Signed-off-by: Greg Kroah-Hartman --- fs/nfsd/nfs4xdr.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index a8587e90fd5a..bbf72d8f9fc0 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2121,9 +2121,15 @@ out_acl: * and this is the root of a cross-mounted filesystem. */ if (ignore_crossmnt == 0 && - exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) { - err = vfs_getattr(exp->ex_path.mnt->mnt_parent, - exp->ex_path.mnt->mnt_mountpoint, &stat); + dentry == exp->ex_path.mnt->mnt_root) { + struct path path = exp->ex_path; + path_get(&path); + while (follow_up(&path)) { + if (path.dentry != path.mnt->mnt_root) + break; + } + err = vfs_getattr(path.mnt, path.dentry, &stat); + path_put(&path); if (err) goto out_nfserr; } -- 2.39.5