[PATCH] nfs.man: document incompatibility between "bg" option and systemd.

[NeilBrown <neilb@suse.com>]

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Systemd does not, and will not, support "bg" correctly.
It has other, better, ways to handle "background" mounting.

Explain this.

See also https://github.com/systemd/systemd/issues/6046

Signed-off-by: NeilBrown <neilb@suse.com>
---
 utils/mount/nfs.man | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/utils/mount/nfs.man b/utils/mount/nfs.man
index cc6e992ed807..7e76492d454f 100644
--- a/utils/mount/nfs.man
+++ b/utils/mount/nfs.man
@@ -372,6 +372,21 @@ Alternatively these issues can be addressed
 using an automounter (refer to
 .BR automount (8)
 for details).
+.IP
+When
+.B systemd
+is used to mount the filesystems listed in
+.IR /etc/fstab ,
+the
+.B bg
+option is not supported, and may be stripped from the option list.
+Similar functionality can be achieved by providing the
+.B x-system.automount
+option.  This will cause
+.B systemd
+to attempt to mount the filesystem when the mountpoint is first
+accessed, rather than during system boot.  The mount still happens in
+the "background", though in a different way.
 .TP 1.5i
 .BR rdirplus " / " nordirplus
 Selects whether to use NFS v3 or v4 READDIRPLUS requests.
@@ -1810,7 +1825,8 @@ such as security negotiation, server referrals, and named attributes.
 .BR rpc.idmapd (8),
 .BR rpc.gssd (8),
 .BR rpc.svcgssd (8),
-.BR kerberos (1)
+.BR kerberos (1),
+.BR systemd.mount (5) .
 .sp
 RFC 768 for the UDP specification.
 .br
-- 
2.12.2


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