[Qemu-devel] [PATCHv6 0/6] introduce max_transfer_length

[Peter Lieven <pl@kamp.de>]

This series adds the basics for introducing a maximum transfer length
to the block layer. Its main purpose is currently avoiding that
a multiwrite_merge exceeds the max_xfer_len of an attached iSCSI LUN.
This is a required bug fix.

Splitting up requests according to the max_transfer_length will follow
in a later series.

v5->v6: - fix parentheses in Patch 1 [Max]
        - rename helper function in Patch 3 [Max]
        - cap the limits to highest power of 2 fitting in INT_MAX [Max]
        - removed full stops in error messages in Patch 6 [Max]

v4->v5: - Added check for (a != 0 instead of !!a) [Max] and some comments [Eric]
        - Correctly limited max_transfer_length to INT_MAX in Patch 3 [Max]
        - Added Patch 5 and Patch 6.

v3->v4: introduce MIN_NON_ZERO to correctly calculate minimum of 2 limits.
v2->v3: remove Patch 2 completely [Paolo]
v1->v2: do not throw errors but generate trace events in Patch 2 [Paolo]

Peter Lieven (6):
  util: introduce MIN_NON_ZERO
  BlockLimits: introduce max_transfer_length
  block/iscsi: set max_transfer_length
  block: avoid creating oversized writes in multiwrite_merge
  block/iscsi: use sector_limits_lun2qemu throughout
    iscsi_refresh_limits
  block/iscsi: check for oversized requests

 block.c                   |    9 +++++++++
 block/iscsi.c             |   49 ++++++++++++++++++++++++++++++++++-----------
 include/block/block_int.h |    3 +++
 include/qemu/osdep.h      |    6 ++++++
 4 files changed, 55 insertions(+), 12 deletions(-)

-- 
1.7.9.5