From 06d9c2905f745c8b1920a335cbb366ba6b0fc754 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Fri, 29 Aug 2014 18:42:29 -0300
Subject: [PATCH] UBI: block: Add support for the UBI_VOLUME_UPDATED
notification
Static volumes can change its 'used_bytes' when they get updated,
and so the block interface must listen to the UBI_VOLUME_UPDATED
notification to resize the block device accordingly.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: stable@vger.kernel.org # v3.15+
---
drivers/mtd/ubi/block.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 581784485376..8876c7d3d712 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -524,8 +524,12 @@ static int ubiblock_resize(struct ubi_volume_info *vi)
}
mutex_lock(&dev->dev_mutex);
- set_capacity(dev->gd, disk_capacity);
- ubi_msg("%s resized to %lld bytes", dev->gd->disk_name, vi->used_bytes);
+
+ if (get_capacity(dev->gd) != disk_capacity) {
+ set_capacity(dev->gd, disk_capacity);
+ ubi_msg("%s resized to %lld bytes", dev->gd->disk_name,
+ vi->used_bytes);
+ }
mutex_unlock(&dev->dev_mutex);
mutex_unlock(&devices_mutex);
return 0;
@@ -549,6 +553,14 @@ static int ubiblock_notify(struct notifier_block *nb,
case UBI_VOLUME_RESIZED:
ubiblock_resize(&nt->vi);
break;
+ case UBI_VOLUME_UPDATED:
+ /*
+ * If the volume is static, a content update might mean the
+ * size (i.e. used_bytes) was also changed.
+ */
+ if (nt->vi.vol_type == UBI_STATIC_VOLUME)
+ ubiblock_resize(&nt->vi);
+ break;
default:
break;
}
--
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