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Document the noncontigwr NFS mount option.

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This is a content change.

MFC after:	3 weeks
This commit is contained in:
Rick Macklem 2013-12-08 00:59:04 +00:00
parent 37d5a7cdf8
commit a8e2866ccd
1 changed files with 14 additions and 1 deletions
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15
sbin/mount_nfs/mount_nfs.8
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@ -28,7 +28,7 @@
.\" @(#)mount_nfs.8 8.3 (Berkeley) 3/29/95
.\" $FreeBSD$
.\"
.Dd July 8, 2013
.Dd December 7, 2013
.Dt MOUNT_NFS 8
.Os
.Sh NAME
@ -257,6 +257,19 @@ servers on the client.
Note that this option will only be honored when performing the
initial mount, it will be silently ignored if used while updating
the mount options.
.It Cm noncontigwr
This mount option allows the NFS client to
combine non-contiguous byte ranges being written
such that the dirty byte range becomes a superset of the bytes
that are dirty.
This reduces the number of writes significantly for software
builds.
The merging of byte ranges isn't done if the file has been file
locked, since most applications modifying a file from multiple
clients will use file locking.
As such, this option could result in a corrupted file for the
rare case of an application modifying the file from multiple
clients concurrently without using file locking.
.It Cm principal
For the RPCSEC_GSS security flavors, such as krb5, krb5i and krb5p,
this option sets the name of the host based principal name expected