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[PATCH 0/5] block, migration: improve debugging of migration bdrv_flush

From: Daniel P . Berrangé
Subject: [PATCH 0/5] block, migration: improve debugging of migration bdrv_flush failure
Date: Thu, 15 Apr 2021 14:58:46 +0100

I spent a while debugging a tricky migration failure today which was
ultimately caused by fdatasync() getting EACCESS. The existing probes
were not sufficient to diagnose this, so I had to resort to GDB. This
improves probes and block error reporting to make future diagnosis
possible without GDB.

Daniel P. Berrangé (5):
  migration: add trace point when vm_stop_force_state fails
  softmmu: add trace point when bdrv_flush_all fails
  block: preserve errno from fdatasync failures
  block: add trace point when fdatasync fails
  block: remove duplicate trace.h include

 block/file-posix.c     | 10 +++++-----
 block/trace-events     |  1 +
 migration/migration.c  |  1 +
 migration/trace-events |  1 +
 softmmu/cpus.c         |  7 ++++++-
 softmmu/trace-events   |  3 +++
 6 files changed, 17 insertions(+), 6 deletions(-)


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