From 7dc95357f8ead71486742a81bf3500482fad7778 Mon Sep 17 00:00:00 2001
From: Juli Mallett <jmallett@FreeBSD.org>
Date: Wed, 29 Jan 2003 23:19:46 +0000
Subject: API for opening (and tracking) writable file descriptors per disk.

---
 lib/libufs/type.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'lib/libufs/type.c')

diff --git a/lib/libufs/type.c b/lib/libufs/type.c
index 41eacfd6a977..54554654d240 100644
--- a/lib/libufs/type.c
+++ b/lib/libufs/type.c
@@ -50,6 +50,8 @@ __FBSDID("$FreeBSD$");
 
 /* Internally, track the 'name' value, it's ours. */
 #define	MINE_NAME	0x01
+/* Track if its fd points to a writable device. */
+#define	MINE_WRITE	0x02
 
 struct uufsd *
 ufs_disk_ctor(const char *name)
@@ -175,3 +177,27 @@ again:	if (stat(name, &st) < 0) {
 
 	return 0;
 }
+
+int
+ufs_disk_write(struct uufsd *disk)
+{
+	int rofd;
+
+	ERROR(disk, NULL);
+
+	if (disk->d_mine & MINE_WRITE)
+		return 0;
+
+	rofd = disk->d_fd;
+
+	disk->d_fd = open(disk->d_name, O_RDWR);
+	if (disk->d_fd < 0) {
+		ERROR(disk, "failed to open disk for writing");
+		disk->d_fd = rofd;
+		return -1;
+	}
+
+	disk->d_mine |= MINE_WRITE;
+
+	return 0;
+}
-- 
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