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[Qemu-block] [PATCH v2 0/6] Auto-fragment large transactions at the bloc
From: |
Eric Blake |
Subject: |
[Qemu-block] [PATCH v2 0/6] Auto-fragment large transactions at the block layer |
Date: |
Fri, 8 Jul 2016 16:35:58 -0600 |
We have max_transfer documented in BlockLimits, but while we
honor it during pwrite_zeroes, we were blindly ignoring it
during pwritev and preadv, leading to multiple drivers having
to implement fragmentation themselves. This series moves
fragmentation to the block layer, then fixes the NBD and iscsi
driver to use it.
qcow2 still does self-fragmenting, but that's because of cluster
boundaries where it really has to do additional work beyond what
the block layer can automatically provide.
Prequisite: Kevin's latest block branch PULL request
Also available as a tag at:
git fetch git://repo.or.cz/qemu/ericb.git nbd-fragment-v2
Changes since v1:
- patch 1 - fix valid -O2 compiler complaint [Kevin]
- patch 2 [old 3] - move earlier [Kevin]
- patch 1, 3 [old 1, 2] - tweak return value
- patch 5 - minor formatting tweak [Kevin]
001/6:[0006] [FC] 'block: Fragment reads to max transfer length'
002/6:[----] [--] 'raw_bsd: Don't advertise flags not supported by protocol
layer'
003/6:[0004] [FC] 'block: Fragment writes to max transfer length'
004/6:[----] [--] 'nbd: Rely on block layer to break up large requests'
005/6:[0004] [FC] 'nbd: Drop unused offset parameter'
006/6:[----] [--] 'iscsi: Rely on block layer to break up large requests'
Eric Blake (6):
block: Fragment reads to max transfer length
raw_bsd: Don't advertise flags not supported by protocol layer
block: Fragment writes to max transfer length
nbd: Rely on block layer to break up large requests
nbd: Drop unused offset parameter
iscsi: Rely on block layer to break up large requests
include/block/nbd.h | 1 -
nbd/nbd-internal.h | 4 +--
block/io.c | 90 +++++++++++++++++++++++++++++++++++++++--------------
block/iscsi.c | 14 +++------
block/nbd-client.c | 78 +++++++++++++---------------------------------
block/nbd.c | 12 ++-----
block/raw_bsd.c | 6 ++--
nbd/common.c | 5 +--
8 files changed, 103 insertions(+), 107 deletions(-)
--
2.5.5
- [Qemu-block] [PATCH v2 0/6] Auto-fragment large transactions at the block layer,
Eric Blake <=
- [Qemu-block] [PATCH v2 2/6] raw_bsd: Don't advertise flags not supported by protocol layer, Eric Blake, 2016/07/08
- [Qemu-block] [PATCH v2 4/6] nbd: Rely on block layer to break up large requests, Eric Blake, 2016/07/08
- [Qemu-block] [PATCH v2 5/6] nbd: Drop unused offset parameter, Eric Blake, 2016/07/08
- [Qemu-block] [PATCH v2 6/6] iscsi: Rely on block layer to break up large requests, Eric Blake, 2016/07/08
- [Qemu-block] [PATCH v2 1/6] block: Fragment reads to max transfer length, Eric Blake, 2016/07/08
- [Qemu-block] [PATCH v2 3/6] block: Fragment writes to max transfer length, Eric Blake, 2016/07/08
- Re: [Qemu-block] [PATCH v2 0/6] Auto-fragment large transactions at the block layer, Stefan Hajnoczi, 2016/07/14