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| author | Mike Snitzer <snitzer@redhat.com> | 2012-07-27 18:08:02 +0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-07-27 18:08:02 +0400 |
| commit | 55f2b8bdb0c7387eb2dc645b9ecbe5d0faa6b54e (patch) | |
| tree | 4428d66325bdc8d4f25a374e10b5a78cb0ab3e54 /include/linux/device-mapper.h | |
| parent | 33d07c0dfab902a7c5420587984497dc05ab5c9c (diff) | |
| download | linux-55f2b8bdb0c7387eb2dc645b9ecbe5d0faa6b54e.tar.xz | |
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 <snitzer@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include/linux/device-mapper.h')
0 files changed, 0 insertions, 0 deletions