From: Neil Brown Date: Thu, 8 Feb 2007 22:20:29 +0000 (-0800) Subject: [PATCH] md: fix various bugs with aligned reads in RAID5 X-Git-Tag: v2.6.21-rc1~83^2~21 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=387bb17374c5fa057462d00d4ba941d49f45de4d;p=pandora-kernel.git [PATCH] md: fix various bugs with aligned reads in RAID5 It is possible for raid5 to be sent a bio that is too big for an underlying device. So if it is a READ that we pass stright down to a device, it will fail and confuse RAID5. So in 'chunk_aligned_read' we check that the bio fits within the parameters for the target device and if it doesn't fit, fall back on reading through the stripe cache and making lots of one-page requests. Note that this is the earliest time we can check against the device because earlier we don't have a lock on the device, so it could change underneath us. Also, the code for handling a retry through the cache when a read fails has not been tested and was badly broken. This patch fixes that code. Signed-off-by: Neil Brown Cc: "Kai" Cc: Cc: Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed