[PATCH 2/3] UBIFS: implement readlink entry point

[Renaud Barbier <renaud.barbier@ge.com>]

Implement the readlink entry point for future use by the DA923RC.

Signed-off-by: Renaud Barbier <renaud.barbier@ge.com>
---
 fs/ubifs/ubifs.c |   38 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/fs/ubifs/ubifs.c b/fs/ubifs/ubifs.c
index dfa6107..e2f9593 100644
--- a/fs/ubifs/ubifs.c
+++ b/fs/ubifs/ubifs.c
@@ -24,6 +24,7 @@
  */
 
 #include <common.h>
+#include <malloc.h>
 #include <driver.h>
 #include <init.h>
 #include <malloc.h>
@@ -549,6 +550,42 @@ static int ubifs_stat(struct device_d *dev, const char *filename, struct stat *s
 	return 0;
 }
 
+static char *ubifs_symlink(struct inode *inode)
+{
+	struct ubifs_inode *ui;
+	char *symlink;
+
+	ui = ubifs_inode(inode);
+	symlink = malloc(ui->data_len + 1);
+
+	memcpy(symlink, ui->data, ui->data_len);
+	symlink[ui->data_len] = '\0';
+
+	return symlink;
+}
+
+static int ubifs_readlink(struct device_d *dev, const char *pathname, char *buf,
+			size_t bufsz)
+{
+	struct ubifs_priv *priv = dev->priv;
+	struct inode *inode;
+	char *symlink;
+	int len;
+
+	inode = ubifs_findfile(priv->sb, pathname);
+
+	if (!inode)
+		return -ENOENT;
+
+	symlink = ubifs_symlink(inode);
+
+	len = min(bufsz, strlen(symlink));
+	memcpy(buf, symlink, len);
+	free(symlink);
+
+	return 0;
+}
+
 static int ubifs_probe(struct device_d *dev)
 {
 	struct fs_device_d *fsdev = dev_to_fs_device(dev);
@@ -609,6 +646,7 @@ static struct fs_driver_d ubifs_driver = {
 	.readdir   = ubifs_readdir,
 	.closedir  = ubifs_closedir,
 	.stat      = ubifs_stat,
+	.readlink  = ubifs_readlink,
 	.type = filetype_ubifs,
 	.flags     = 0,
 	.drv = {
-- 
1.7.1


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