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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2007-09-13 14:28:14 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2007-10-14 13:10:21 +0300
commite8823bd63d50bb1f9bd73f1197230e1f7217456a (patch)
tree3b8b849512686aebda99f83d290c9e09ed983967 /fs/fat
parent6986646ba752fef150286926aa922ef04e9d19dd (diff)
UBI: fix atomic LEB change problems
When the UBI device is nearly full, i.e. all LEBs are mapped, we have only one spare LEB left - the one we reserved for WL purposes. Well, I do not count the LEBs which were reserved for bad PEB handling - suppose NOR flash for simplicity. If an "atomic LEB change operation" is run, and the WL unit is moving a LEB, we have no spare LEBs to finish the operation and fail, which is not good. Moreover, if there are 2 or more simultanious "atomic LEB change" requests, only one of them has chances to succeed, the other will fail with -ENOSPC. Not good either. This patch does 2 things: 1. Reserves one PEB for the "atomic LEB change" operation. 2. Serealize the operations so that only on of them may run at a time (by means of a mutex). Pointed-to-by: Brijesh Singh <brijesh.s.singh@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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