[PATCH 0/2] block/fuse: Let PUNCH_HOLE write zeroes

[Hanna Czenczek]

Hi,

https://gitlab.com/qemu-project/qemu/-/issues/1507 reports a bug in FUSE
exports: fallocate(PUNCH_HOLE) is implemented with blk_pdiscard(), but
its man page documents that a successful call will result in the data
being read as zero.  blk_pdiscard() does not guarantee this, so we must
use blk_pwrite_zeroes() instead (with MAY_UNMAP | NO_FALLBACK, which
differentiates it from fallocate(ZERO_RANGE)).

Patch 2 adds a regression test.


Hanna Czenczek (2):
  block/fuse: Let PUNCH_HOLE write zeroes
  iotests/308: Add test for 'write -zu'

 block/export/fuse.c        | 11 +++++++++-
 tests/qemu-iotests/308     | 43 ++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/308.out | 35 +++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 1 deletion(-)

-- 
2.39.1