Commit 462d6057 authored by Al Viro's avatar Al Viro
Browse files

fix NFS4 handling of mountpoint stat 



RFC says we need to follow the chain of mounts if there's more
than one stacked on that point.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 3088dd70

fs/nfsd/nfs4xdr.c

+9 −3
Original line number Diff line number Diff line
@@ -2121,9 +2121,15 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp, 
		 * 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;

		}