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mount_nullfs.8: document unixbypass and nounixbypass

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Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D52983
This commit is contained in:
Konstantin Belousov 2025-10-09 23:55:01 +03:00
parent 6fa205a623
commit 033587a985
1 changed files with 27 additions and 1 deletions
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28
sbin/mount_nullfs/mount_nullfs.8
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@ -90,7 +90,7 @@ See the
.Xr mount 8
man page for possible options and their meanings.
Additionally the following option is supported:
.Bl -tag -width nocache
.Bl -tag -width nounixbypass
.It Cm nocache
Disable metadata caching in the null layer.
Some lower-layer file systems may force this option.
@ -98,6 +98,32 @@ Depending on the access pattern,
this may result in increased lock contention.
.It Cm cache
Force enable metadata caching.
.It Cm nounixbypass
Disable bypassing
.Xr unix 4
socket files used for
.Xr bind 2
and
.Xr connect 2 ,
to the lower (mounted-from) filesystem layer.
.Pp
The effect is that lower and upper (bypassed) unix sockets
are separate.
.It Cm unixbypass
Enable the bypass of unix socket file to lower filesystem layer.
This is default.
.Pp
The effect is that
.Xr bind 2
and
.Xr connect 2
operations on a unix socket done from either the upper (nullfs) or lower
layer path are performed on same unix socket.
For instance, if a server
.Xr bind 2
is done on a socket in the lower layer, then
.Xr connect 2
on the socket file accessed via the nullfs mount, connects to the server.
.El
.El
.Pp