| Date | Thu, 22 Apr 2010 12:09:34 -0700 | From | Greg KH <> | Subject | [123/197] fix NFS4 handling of mountpoint stat |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Al Viro <viro@zeniv.linux.org.uk>
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 <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- fs/nfsd/nfs4xdr.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
--- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2129,9 +2129,15 @@ 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; }
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