Just one more thought about this one....
If you mistakenly attempt to mount a server that's using rpc for some
service other than nfs, then this will result in a hang where we
previously got a useful error, right?
Maybe that's a rare enough case not to worry about these days.
--b.
On Fri, Aug 19, 2016 at 11:45:56AM +1000, NeilBrown wrote:
> Commit: bf66c9facb8e ("mounts.nfs: v2 and v3 background mounts should retry when server is down.")
>
> changed the behaviour of "bg" mounts so that RPC_PROGNOTREGISTERED,
> which maps to EOPNOTSUPP, is not a permanent error.
> This useful because when an NFS server starts up there is a small window between
> the moment that rpcbind (or portmap) starts responding to lookup requests,
> and the moment when nfsd registers with rpcbind. During that window
> rpcbind will reply with RPC_PROGNOTREGISTERED, but mount should not give up.
>
> This same reasoning applies to foreground mounts. They don't wait for
> as long, but could still hit the window and fail prematurely.
>
> So revert the above patch and instead add EOPNOTSUPP to the list of
> temporary errors known to nfs_is_permanent_error.
>
> Signed-off-by: NeilBrown <neilb@xxxxxxxx>
> ---
> utils/mount/stropts.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c
> index 9de6794c6177..d5dfb5e4a669 100644
> --- a/utils/mount/stropts.c
> +++ b/utils/mount/stropts.c
> @@ -948,6 +948,7 @@ static int nfs_is_permanent_error(int error)
> case ETIMEDOUT:
> case ECONNREFUSED:
> case EHOSTUNREACH:
> + case EOPNOTSUPP: /* aka RPC_PROGNOTREGISTERED */
> case EAGAIN:
> return 0; /* temporary */
> default:
> @@ -1019,8 +1020,7 @@ static int nfsmount_parent(struct nfsmount_info *mi)
> if (nfs_try_mount(mi))
> return EX_SUCCESS;
>
> - /* retry background mounts when the server is not up */
> - if (nfs_is_permanent_error(errno) && errno != EOPNOTSUPP) {
> + if (nfs_is_permanent_error(errno)) {
> mount_error(mi->spec, mi->node, errno);
> return EX_FAIL;
> }
> @@ -1055,8 +1055,7 @@ static int nfsmount_child(struct nfsmount_info *mi)
> if (nfs_try_mount(mi))
> return EX_SUCCESS;
>
> - /* retry background mounts when the server is not up */
> - if (nfs_is_permanent_error(errno) && errno != EOPNOTSUPP)
> + if (nfs_is_permanent_error(errno))
> break;
>
> if (time(NULL) > timeout)
>
--
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