From: NeilBrown Date: Sun, 10 Dec 2006 10:20:49 +0000 (-0800) Subject: [PATCH] md: fix innocuous bug in raid6 stripe_to_pdidx X-Git-Tag: v2.6.20-rc1~145^2~26 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b875e531fc82db592d6093594593d5cafde0a1cd;p=pandora-kernel.git [PATCH] md: fix innocuous bug in raid6 stripe_to_pdidx stripe_to_pdidx finds the index of the parity disk for a given stripe. It assumes raid5 in that it uses "disks-1" to determine the number of data disks. This is incorrect for raid6 but fortunately the two usages cancel each other out. The only way that 'data_disks' affects the calculation of pd_idx in raid5_compute_sector is when it is divided into the sector number. But as that sector number is calculated by multiplying in the wrong value of 'data_disks' the division produces the right value. So it is innocuous but needs to be fixed. Also change the calculation of raid_disks in compute_blocknr to make it more obviously correct (it seems at first to always use disks-1 too). Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed