upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-06-03 13:58:30 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

mount_nullfs(8): document -o cache and vfs.nullfs.cache_vnodes

Browse source 
(cherry picked from commit 4a2a69c4472cf677f8dfc026fff3dd33c83580cb)
This commit is contained in:
Konstantin Belousov 2024-03-08 20:26:48 +02:00
parent adcb01c08e
commit ea8d7263d9
1 changed files with 8 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
sbin/mount_nullfs/mount_nullfs.8
View file

@ -32,7 +32,7 @@
.\"
.\" @(#)mount_null.8 8.6 (Berkeley) 5/1/95
.\"
.Dd June 11, 2023
.Dd March 24, 2024
.Dt MOUNT_NULLFS 8
.Os
.Sh NAME
@ -92,15 +92,21 @@ See the
.Xr mount 8
man page for possible options and their meanings.
Additionally the following option is supported:
.Bl -tag -width indent
.Bl -tag -width nocache
.It Cm nocache
Disable metadata caching in the null layer.
Some lower-layer file systems may force this option.
Depending on the access pattern,
this may result in increased lock contention.
.It Cm cache
Force enable metadate caching.
.El
.El
.Pp
The
.Dv vfs.nullfs.cache_vnodes
sysctl specifies global default for mount-specific cache/nocache option.
.Pp
The null layer has two purposes.
First, it serves as a demonstration of layering by providing a layer
which does nothing.