svn_rev_452

add erase function

1 files changed, 18 insertions, 1 deletions

diff --git a/fs/fs.c b/fs/fs.c
index 1d56c863f6..6165141426 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -47,7 +47,7 @@ static int init_cwd(void)
 	return 0;
 }
 
-core_initcall(init_cwd);
+postcore_initcall(init_cwd);
 
 /*
  * - Remove all multiple slashes
@@ -448,6 +448,23 @@ out:
 	return errno;
 }
 
+int erase(int fd, size_t count, unsigned long offset)
+{
+	struct device_d *dev;
+	struct fs_driver_d *fsdrv;
+	FILE *f = &files[fd];
+
+	dev = f->dev;
+
+	fsdrv = (struct fs_driver_d *)dev->driver->type_data;
+
+	if (f->pos + count > f->size)
+		count = f->size - f->pos;
+	errno = fsdrv->erase(dev, f, count, offset);
+
+	return errno;
+}
+
 int close(int fd)
 {
 	struct device_d *dev;