[PATCH 2/4] libfile: implement new helper write_file_flash()

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

Compared to write_file() this new function also calls erase() to be
suitable for flash devices.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 include/libfile.h |  1 +
 lib/libfile.c     | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/libfile.h b/include/libfile.h
index fd2fadeaa81a..2c5eef71f169 100644
--- a/include/libfile.h
+++ b/include/libfile.h
@@ -12,6 +12,7 @@ int read_file_2(const char *filename, size_t *size, void **outbuf,
 		loff_t max_size);
 
 int write_file(const char *filename, const void *buf, size_t size);
+int write_file_flash(const char *filename, const void *buf, size_t size);
 
 int copy_file(const char *src, const char *dst, int verbose);
 
diff --git a/lib/libfile.c b/lib/libfile.c
index b7db22d6940a..2d4335db7dbd 100644
--- a/lib/libfile.c
+++ b/lib/libfile.c
@@ -250,6 +250,39 @@ int write_file(const char *filename, const void *buf, size_t size)
 }
 EXPORT_SYMBOL(write_file);
 
+/**
+ * write_file_flash - write a buffer to a file backed by flash
+ * @filename:    The filename to write
+ * @size:        The size of the buffer
+ *
+ * Functional this is identical to write_file but calls erase() before writing.
+ *
+ * Return: 0 for success or negative error value
+ */
+int write_file_flash(const char *filename, const void *buf, size_t size)
+{
+	int fd, ret;
+
+	fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT);
+	if (fd < 0)
+		return fd;
+
+	ret = erase(fd, size, 0);
+	if (ret < 0)
+		goto out_close;
+
+	ret = write_full(fd, buf, size);
+
+out_close:
+	close(fd);
+
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL(write_file_flash);
+
 /**
  * copy_file - Copy a file
  * @src:	The source filename
-- 
2.17.0


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