From 55f2b8bdb0c7387eb2dc645b9ecbe5d0faa6b54e Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Fri, 27 Jul 2012 15:08:02 +0100 Subject: [PATCH] dm thin: support for non power of 2 pool blocksize Non power of 2 blocksize support is needed to properly align thinp IO on storage that has non power of 2 optimal IO sizes (e.g. RAID6 10+2). Use sector_div to support non power of 2 blocksize for the pool's data device. This provides comparable performance to the power of 2 math that was performed until now (as tested on modern x86_64 hardware). The kernel currently assumes that limits->discard_granularity is a power of two so the thin target only enables discard support if the block size is a power of two. Eliminate pool structure's 'block_shift', 'offset_mask' and remaining 4 byte holes. Signed-off-by: Mike Snitzer Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- Reading git-format-patch failed