[PATCH 1/2] blspec: Add missing prototype for blspec_scan_device

[PATCH 1/2] blspec: Add missing prototype for blspec_scan_device

[Sascha Hauer]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 include/blspec.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/blspec.h b/include/blspec.h
index afac5ed..e22e9be 100644
--- a/include/blspec.h
+++ b/include/blspec.h
@@ -35,6 +35,7 @@ int blspec_boot_devicename(const char *devname, int verbose, int dryrun);
 
 int blspec_scan_devices(struct blspec *blspec);
 
+int blspec_scan_device(struct blspec *blspec, struct device_d *dev);
 int blspec_scan_devicename(struct blspec *blspec, const char *devname);
 int blspec_scan_directory(struct blspec *blspec, const char *root);
 
-- 
2.1.4


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[PATCH 2/2] blspec: Automatically attach UBI devices

[Sascha Hauer]

When blspec_scan_cdev finds an UBI device then attach it. This
allows us to boot blspec entries found on the UBIFS images inside
UBI volumes by pointing to the corresponding mtd partition.
With this we can do 'boot nand0.root' or even 'boot=nand0' on the
commandline.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 common/blspec.c | 50 +++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 45 insertions(+), 5 deletions(-)

diff --git a/common/blspec.c b/common/blspec.c
index 3506388..aef246d 100644
--- a/common/blspec.c
+++ b/common/blspec.c
@@ -30,6 +30,7 @@
 #include <of.h>
 #include <linux/stat.h>
 #include <linux/err.h>
+#include <mtd/ubi-user.h>
 
 /*
  * blspec_entry_var_set - set a variable to a value
@@ -436,6 +437,35 @@ err_out:
 }
 
 /*
+ * blspec_scan_ubi - scan over a cdev containing UBI volumes
+ *
+ * This function attaches a cdev as UBI devices and collects all blspec
+ * entries found in the UBI volumes
+ *
+ * returns the number of entries found or a negative error code if some unexpected
+ * error occured.
+ */
+static int blspec_scan_ubi(struct blspec *blspec, struct cdev *cdev)
+{
+	struct device_d *child;
+	int ret, found = 0;
+
+	pr_debug("%s: %s\n", __func__, cdev->name);
+
+	ret = ubi_attach_mtd_dev(cdev->mtd, UBI_DEV_NUM_AUTO, 0, 20);
+	if (ret && ret != -EEXIST)
+		return 0;
+
+	device_for_each_child(cdev->dev, child) {
+		ret = blspec_scan_device(blspec, child);
+		if (ret > 0)
+			found += ret;
+	}
+
+	return found;
+}
+
+/*
  * blspec_scan_cdev - scan over a cdev
  *
  * Given a cdev this function mounts the filesystem and collects all blspec
@@ -446,9 +476,9 @@ err_out:
  */
 static int blspec_scan_cdev(struct blspec *blspec, struct cdev *cdev)
 {
-	int ret;
+	int ret, found = 0;
 	void *buf = xzalloc(512);
-	enum filetype type;
+	enum filetype type, filetype;
 	const char *rootpath;
 
 	pr_debug("%s: %s\n", __func__, cdev->name);
@@ -460,16 +490,26 @@ static int blspec_scan_cdev(struct blspec *blspec, struct cdev *cdev)
 	}
 
 	type = file_detect_partition_table(buf, 512);
+	filetype = file_detect_type(buf, 512);
 	free(buf);
 
 	if (type == filetype_mbr || type == filetype_gpt)
 		return -EINVAL;
 
+	if (filetype == filetype_ubi && IS_ENABLED(CONFIG_MTD_UBI)) {
+		ret = blspec_scan_ubi(blspec, cdev);
+		if (ret > 0)
+			found += ret;
+	}
+
 	rootpath = cdev_mount_default(cdev, NULL);
-	if (IS_ERR(rootpath))
-		return PTR_ERR(rootpath);
+	if (!IS_ERR(rootpath)) {
+		ret = blspec_scan_directory(blspec, rootpath);
+		if (ret > 0)
+			found += ret;
+	}
 
-	return blspec_scan_directory(blspec, rootpath);
+	return found;
 }
 
 /*
-- 
2.1.4


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