From aa69947399a119d7f1b35bbcd62c849839b35449 Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Wed, 8 Dec 2010 12:40:13 +0300 Subject: [PATCH] NFS: suppressing showing of default mount port value in /proc fixed Update: added check for zero value as it was before (note: can't simply check mountd_port for positive value because it's typeof unsigned short) Default value for mount server port is set to NFS_UNSPEC_PORT (-1) and will not be changed during parsing mount options for mound data version 6. This default value will be showed for mountport in /proc/mounts always since current default check is for zero value. This small mistake leads to big problem, because during umount.nfs execution from old user-space utils (at least nfs-utils 1.0.9) this value will be used as the server port to connect to. This request will be rejected (since port is 65535) and thus nfs mount point can't be unmounted. Note from Chuck Lever (chuck.lever@oracle.com): this is only possible if /etc/mtab is a link to /proc/mounts. Not all systems have this configuration. Signed-off-by: Stanislav Kinsbursky Signed-off-by: Trond Myklebust --- fs/nfs/super.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 4100630c9a5b..dd56eec16eac 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -598,7 +598,9 @@ static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, if (nfss->mountd_version || showdefaults) seq_printf(m, ",mountvers=%u", nfss->mountd_version); - if (nfss->mountd_port || showdefaults) + if ((nfss->mountd_port && + nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || + showdefaults) seq_printf(m, ",mountport=%u", nfss->mountd_port); nfs_show_mountd_netid(m, nfss, showdefaults); -- 2.30.2