Finish making 'wcommitsize' an NFS client mount option.

Reviewed by:	rmacklem
MFC after:	1 week

2 files changed, 11 insertions, 0 deletions

diff --git a/sbin/mount_nfs/mount_nfs.8 b/sbin/mount_nfs/mount_nfs.8
index be9e309..bdb0707 100644
--- a/sbin/mount_nfs/mount_nfs.8
+++ b/sbin/mount_nfs/mount_nfs.8
@@ -318,6 +318,10 @@ tune the timeout
 interval.)
 .It Cm udp
 Use UDP transport.
+.It Cm wcommitsize Ns = Ns Aq Ar value
+Set the maximum pending write commit size to the specified value.
+This determines the maximum amount of pending write data that the NFS
+client is willing to cache for each file.
 .It Cm wsize Ns = Ns Aq Ar value
 Set the write data size to the specified value.
 Ditto the comments w.r.t.\& the
diff --git a/sbin/mount_nfs/mount_nfs.c b/sbin/mount_nfs/mount_nfs.c
index 5386723..9da3137 100644
--- a/sbin/mount_nfs/mount_nfs.c
+++ b/sbin/mount_nfs/mount_nfs.c
@@ -612,6 +612,13 @@ fallback_mount(struct iovec *iov, int iovlen, int mntflags)
 		}
 		args.flags |= NFSMNT_ACDIRMAX;
 	}
+	if (findopt(iov, iovlen, "wcommitsize", &opt, NULL) == 0) {
+		ret = sscanf(opt, "%d", &args.wcommitsize);
+		if (ret != 1 || args.wcommitsize < 0) {
+			errx(1, "illegal wcommitsize: %s", opt);
+		}
+		args.flags |= NFSMNT_WCOMMITSIZE;
+	}
 	if (findopt(iov, iovlen, "deadthresh", &opt, NULL) == 0) {
 		ret = sscanf(opt, "%d", &args.deadthresh);
 		if (ret != 1 || args.deadthresh <= 0) {