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UBI: add UBI devices reference counting
authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Mon, 17 Dec 2007 15:37:26 +0000 (17:37 +0200)
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Wed, 26 Dec 2007 17:15:17 +0000 (19:15 +0200)
This is one more step on the way to "removable" UBI devices. It
adds reference counting for UBI devices. Every time a volume on
this device is opened - the device's refcount is increased. It
is also increased if someone is reading any sysfs file of this
UBI device or of one of its volumes.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

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