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block: extend BLOCK_IO_ERROR with reason string

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BLOCK_IO_ERROR events are logged by libvirt, which helps with
post mortem analysis of guests. However, one information that
we miss today is a human readable string describing the cause
of the I/O error.

This commit adds that string it to BLOCK_IO_ERROR. Note that
this string is a debugging aid for humans, meaning that it
should not parsed by applications.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Luiz Capitulino 2014-09-11 10:25:48 -04:00 • committed by Kevin Wolf
parent 745a9bb9cd
commit 624ff5736e
2 changed files with 8 additions and 2 deletions
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7
qapi/block-core.json
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@ -1593,6 +1593,10 @@
# io-status is present, please see query-block documentation
# for more information (since: 2.2)
#
# @reason: human readable string describing the error cause.
# (This field is a debugging aid for humans, it should not
# be parsed by applications) (since: 2.2)
#
# Note: If action is "stop", a STOP event will eventually follow the
# BLOCK_IO_ERROR event
#
@ -1600,7 +1604,8 @@
##
{ 'event': 'BLOCK_IO_ERROR',
'data': { 'device': 'str', 'operation': 'IoOperationType',
'action': 'BlockErrorAction', '*nospace': 'bool' } }
'action': 'BlockErrorAction', '*nospace': 'bool',
'reason': 'str' } }
##
# @BLOCK_JOB_COMPLETED