From: Artem Bityutskiy Date: Thu, 13 Sep 2007 11:28:14 +0000 (+0300) Subject: UBI: fix atomic LEB change problems X-Git-Tag: v2.6.24-rc1~1324^2^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8823bd63d50bb1f9bd73f1197230e1f7217456a;p=pandora-kernel.git 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 Signed-off-by: Artem Bityutskiy --- Reading git-diff-tree failed