Merge pull request torvalds#353 from M1cha/encode-dev

make 'encode_dev_from_sysfs' a public library function

Author: tavip

tools/lkl/include/lkl.h

@@ -127,6 +127,20 @@ int lkl_disk_add(struct lkl_disk *disk);
  */
 int lkl_disk_remove(struct lkl_disk disk);
 
+/**
+ * lkl_get_virtiolkl_encode_dev_from_sysfs_blkdev - extract device id from sysfs
+ *
+ * This function returns the device id for the given sysfs dev node.
+ * The content of the node has to be in the form 'MAJOR:MINOR'.
+ * Also, this function expects an absolute path which means that sysfs
+ * already has to be mounted at the given path
+ *
+ * @sysfs_path - absolute path to the sysfs dev node
+ * @pdevid - pointer to memory where dev id will be returned
+ * @returns - 0 on success, a negative value on error
+ */
+int lkl_encode_dev_from_sysfs(const char *sysfs_path, uint32_t *pdevid);
+
 /**
  * lkl_get_virtio_blkdev - get device id of a disk (partition)
  *

tools/lkl/lib/fs.c

@@ -74,7 +74,7 @@ static int get_node_with_prefix(const char *path, const char *prefix,
 	return ret;
 }
 
-static int encode_dev_from_sysfs(const char *sysfs_path, uint32_t *pdevid)
+int lkl_encode_dev_from_sysfs(const char *sysfs_path, uint32_t *pdevid)
 {
 	int ret;
 	long fd;
@@ -191,7 +191,7 @@ int lkl_get_virtio_blkdev(int disk_id, unsigned int part, uint32_t *pdevid)
 	if (ret)
 		return ret;
 
-	return encode_dev_from_sysfs(sysfs_path, pdevid);
+	return lkl_encode_dev_from_sysfs(sysfs_path, pdevid);
 }
 
 long lkl_mount_dev(unsigned int disk_id, unsigned int part,