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From: Markus Pargmann <mpa@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 4/5] ubi: Helper to iterate over all ubi volumes
Date: Tue,  8 Mar 2016 11:56:08 +0100	[thread overview]
Message-ID: <1457434569-32054-4-git-send-email-mpa@pengutronix.de> (raw)
In-Reply-To: <1457434569-32054-1-git-send-email-mpa@pengutronix.de>

To find all the ubi volume ids on a given UBI, we need a helper. The
added functions allow to use ubi_volume_for_each() to get each volume id
of a UBI.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
 drivers/mtd/ubi/kapi.c  | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/mtd/ubi.h | 11 +++++++++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index c2e58e865753..f3b0f0d85d84 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -308,6 +308,48 @@ void ubi_close_volume(struct ubi_volume_desc *desc)
 }
 EXPORT_SYMBOL_GPL(ubi_close_volume);
 
+int ubi_volume_first(int ubi_num, struct ubi_device **ubi, int *vol_id)
+{
+	int i;
+
+	/* We keep the device until the last call of ubi_volume_next
+	 * or ubi_volume_abort */
+	*ubi = ubi_get_device(ubi_num);
+	if (!*ubi)
+		return -ENODEV;
+
+	for (i = 0; i < (*ubi)->vtbl_slots; ++i) {
+		if ((*ubi)->volumes[i]) {
+			*vol_id = i;
+			return 0;
+		}
+	}
+
+	ubi_put_device(*ubi);
+	return -ENOENT;
+}
+
+int ubi_volume_next(struct ubi_device *ubi, int *vol_id)
+{
+	int i;
+
+	for (i = *vol_id + 1; i < ubi->vtbl_slots; ++i) {
+		if (ubi->volumes[i]) {
+			*vol_id = i;
+			return 0;
+		}
+	}
+
+	ubi_put_device(ubi);
+
+	return -ENOENT;
+}
+
+void ubi_volume_abort(struct ubi_device *ubi)
+{
+	ubi_put_device(ubi);
+}
+
 struct cdev *ubi_volume_get_cdev(struct ubi_volume_desc *vol)
 {
 	return &vol->vol->cdev;
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 0725b04f9dfd..344842e4ed97 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -220,6 +220,17 @@ int ubi_flush(int ubi_num, int vol_id, int lnum);
 
 struct cdev *ubi_volume_get_cdev(struct ubi_volume_desc *vol);
 
+struct ubi_device;
+int ubi_volume_first(int ubi_num, struct ubi_device **ubi, int *vol_id);
+int ubi_volume_next(struct ubi_device *ubi, int *vol_id);
+void ubi_volume_abort(struct ubi_device *ubi);
+
+#define ubi_volume_for_each(ubi_num, ubi, vol_id, ret) \
+	for (ret = ubi_volume_first(ubi_num, &(ubi), &(vol_id)); \
+	     !ret; \
+	     ret = ubi_volume_next(ubi, &(vol_id)))
+
+
 /*
  * This function is the same as the 'ubi_leb_read()' function, but it does not
  * provide the checking capability.
-- 
2.7.0


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  parent reply	other threads:[~2016-03-08 10:56 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-08 10:56 [PATCH 1/5] fs: Add for_each_fs_device_safe() Markus Pargmann
2016-03-08 10:56 ` [PATCH 2/5] ubi: Add getter ubi_volume_get_cdev() Markus Pargmann
2016-03-08 10:56 ` [PATCH 3/5] ubi: Add helper to map a mtd device to a ubi number Markus Pargmann
2016-03-08 10:56 ` Markus Pargmann [this message]
2016-03-08 10:56 ` [PATCH 5/5] ubiformat: Cleanly umount and detach the ubi before formating Markus Pargmann
2016-03-09  7:55   ` Sascha Hauer

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