1 files changed, 38 insertions, 0 deletions
diff --git a/sys/fs/msdosfs/msdosfs_vfsops.c b/sys/fs/msdosfs/msdosfs_vfsops.c
index a209970..213dd00 100644
--- a/sys/fs/msdosfs/msdosfs_vfsops.c
+++ b/sys/fs/msdosfs/msdosfs_vfsops.c
@@ -896,6 +896,40 @@ msdosfs_statfs(struct mount *mp, struct statfs *sbp)
 	return (0);
 }
 
+/*
+ * If we have an FSInfo block, update it.
+ */
+static int
+msdosfs_fsiflush(struct msdosfsmount *pmp, int waitfor)
+{
+	struct fsinfo *fp;
+	struct buf *bp;
+	int error;
+
+	MSDOSFS_LOCK_MP(pmp);
+	if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) {
+		error = 0;
+		goto unlock;
+	}
+	error = bread(pmp->pm_devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec,
+	    NOCRED, &bp);
+	if (error != 0) {
+		brelse(bp);
+		goto unlock;
+	}
+	fp = (struct fsinfo *)bp->b_data;
+	putulong(fp->fsinfree, pmp->pm_freeclustercount);
+	putulong(fp->fsinxtfree, pmp->pm_nxtfree);
+	pmp->pm_flags &= ~MSDOSFS_FSIMOD;
+	if (waitfor == MNT_WAIT)
+		error = bwrite(bp);
+	else
+		bawrite(bp);
+unlock:
+	MSDOSFS_UNLOCK_MP(pmp);
+	return (error);
+}
+
 static int
 msdosfs_sync(struct mount *mp, int waitfor)
 {
@@ -958,6 +992,10 @@ loop:
 			allerror = error;
 		VOP_UNLOCK(pmp->pm_devvp, 0);
 	}
+
+	error = msdosfs_fsiflush(pmp, waitfor);
+	if (error != 0)
+		allerror = error;
 	return (allerror);
 }