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

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Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2024-03-08 20:26:48 +02:00
parent 8921216dbe
commit 4a2a69c447
1 changed files with 8 additions and 2 deletions
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10
sbin/mount_nullfs/mount_nullfs.8
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@ -30,7 +30,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd June 11, 2023
.Dd March 24, 2024
.Dt MOUNT_NULLFS 8
.Os
.Sh NAME
@ -90,15 +90,21 @@ 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.