From: Mark Fasheh Date: Sat, 23 Sep 2006 00:28:19 +0000 (-0700) Subject: ocfs2: Remove i_generation from inode lock names X-Git-Tag: v2.6.19-rc1~1259^2~14 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24c19ef40474c3930597f31ae233dc06319bd881;p=pandora-kernel.git ocfs2: Remove i_generation from inode lock names OCFS2 puts inode meta data in the "lock value block" provided by the DLM. Typically, i_generation is encoded in the lock name so that a deleted inode on and a new one in the same block don't share the same lvb. Unfortunately, that scheme means that the read in ocfs2_read_locked_inode() is potentially thrown away as soon as the meta data lock is taken - we cannot encode the lock name without first knowing i_generation, which requires a disk read. This patch encodes i_generation in the inode meta data lvb, and removes the value from the inode meta data lock name. This way, the read can be covered by a lock, and at the same time we can distinguish between an up to date and a stale LVB. This will help cold-cache stat(2) performance in particular. Since this patch changes the protocol version, we take the opportunity to do a minor re-organization of two of the LVB fields. Signed-off-by: Mark Fasheh --- Reading git-diff-tree failed