[PATCH 14/18] misc: storage-by-alias: switch over to using cdev aliases

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

This makes it easy to support referencing further cdev aliases
from the device tree.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 commands/boot.c                 |  1 +
 common/cdev-alias.c             | 31 +++++++++++++++++++++++++++++++
 drivers/misc/storage-by-alias.c | 25 +++++++++----------------
 3 files changed, 41 insertions(+), 16 deletions(-)

diff --git a/commands/boot.c b/commands/boot.c
index 502ad19e5e75..97c574b4a0a3 100644
--- a/commands/boot.c
+++ b/commands/boot.c
@@ -184,6 +184,7 @@ BAREBOX_CMD_HELP_TEXT("- \"bootchooser\": boot with barebox bootchooser")
 #endif
 #ifdef CONFIG_BOOT_DEFAULTS
 BAREBOX_CMD_HELP_TEXT("- \"bootsource\": boot from the device barebox has been started from")
+BAREBOX_CMD_HELP_TEXT("- \"diskuuid.*\": boot from disk with specified diskuuid")
 #endif
 BAREBOX_CMD_HELP_TEXT("")
 BAREBOX_CMD_HELP_TEXT("Multiple bootsources may be given which are probed in order until")
diff --git a/common/cdev-alias.c b/common/cdev-alias.c
index 09e6770f5dea..4ce79d0ba4a7 100644
--- a/common/cdev-alias.c
+++ b/common/cdev-alias.c
@@ -35,8 +35,39 @@ static int cdev_alias_resolve_bootsource(struct cdev_alias *cdev_alias,
 	return fn(cdev, data);
 }
 
+static int cdev_alias_resolve_diskuuid(struct cdev_alias *cdev_alias,
+				       const char *uuid,
+				       cdev_alias_processor_t fn,
+				       void *data)
+{
+	struct cdev *cdev;
+	char *arg;
+
+	arg = xstrdup(uuid);
+	uuid = strsep(&arg, ".");
+	if (!uuid || !*uuid)
+		return -EINVAL;
+
+	for_each_cdev(cdev) {
+		if (cdev_is_partition(cdev))
+			continue;
+
+		if (strcasecmp(cdev->diskuuid, uuid))
+			continue;
+
+		cdev = cdev_find_partition(cdev, arg);
+		if (!cdev)
+			return -ENODEV;
+
+		return fn(cdev, data);
+	}
+
+	return 0;
+}
+
 static struct cdev_alias cdev_alias_aliases[] = {
 	{ "bootsource", cdev_alias_resolve_bootsource },
+	{ "diskuuid", cdev_alias_resolve_diskuuid },
 	{ /* sentinel */}
 };
 
diff --git a/drivers/misc/storage-by-alias.c b/drivers/misc/storage-by-alias.c
index 2795ff93c07c..0bf0059ad41c 100644
--- a/drivers/misc/storage-by-alias.c
+++ b/drivers/misc/storage-by-alias.c
@@ -119,12 +119,15 @@ static struct cdev_operations sba_ops = {
 	.truncate = sba_truncate,
 };
 
-static void sba_add_partitions(struct sba *sba, struct cdev *rcdev)
+static int sba_add_partitions(struct cdev *rcdev, void *data)
 {
+	struct sba *sba = data;
 	int ret;
 
+	dev_dbg(sba->dev, "Adding %s -> %s\n", sba->alias, rcdev->name);
+
 	if (sba->rcdev)
-		return;
+		return 0;
 
 	sba->rcdev = rcdev;
 	sba->cdev.name = sba->alias;
@@ -139,26 +142,16 @@ static void sba_add_partitions(struct sba *sba, struct cdev *rcdev)
 	ret = devfs_create(&sba->cdev);
 	if (ret) {
 		dev_err(sba->dev, "Failed to create cdev: %s\n", strerror(-ret));
-		return;
+		return 0;
 	}
 
 	of_parse_partitions(&sba->cdev, sba->dev->of_node);
+	return 0;
 }
 
 static void check_exist(struct sba *sba)
 {
-	struct cdev *cdev;
-
-	for_each_cdev(cdev) {
-		if (cdev_is_partition(cdev))
-			continue;
-		if (strcmp(cdev->diskuuid, sba->alias))
-			continue;
-
-		dev_dbg(sba->dev, "Found %s %s\n", cdev->name, cdev->diskuuid);
-		sba_add_partitions(sba, cdev);
-		return;
-	}
+	cdev_alias_resolve_for_each(sba->alias, sba_add_partitions, sba);
 }
 
 static int sba_detect(struct device *dev)
@@ -181,7 +174,7 @@ static int storage_by_uuid_init(struct sba *sba)
 	if (ret)
 		return ret;
 
-	sba->alias = xstrdup(uuid);
+	sba->alias = xasprintf("diskuuid.%s", uuid);
 
 	return 0;
 }
-- 
2.39.5