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| author | Luiz Capitulino <lcapitulino@redhat.com> | 2014-08-29 16:07:27 -0400 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2014-09-10 10:41:29 +0200 |
| commit | c7c2ff0c7e5d2c04fc612d74caab19b41c52c2e9 (patch) | |
| tree | 82f6ed49bf15b78c0bbc14f8e4b40836f3578d2a /qapi | |
| parent | 10601bef566461efbea81ee344ed3355ce71954a (diff) | |
| download | qemu-c7c2ff0c7e5d2c04fc612d74caab19b41c52c2e9.tar.gz | |
block: extend BLOCK_IO_ERROR event with nospace indicator
Management software, such as RHEV's vdsm, want to be able to allocate
disk space on demand. The basic use case is to start a VM with a small
disk and then the disk is enlarged when QEMU hits a ENOSPC condition.
To this end, the management software has to be notified when QEMU
encounters ENOSPC. The solution implemented by this commit is simple:
it extends the BLOCK_IO_ERROR with a 'nospace' key, which is true
when QEMU is stopped due to ENOSPC.
Note that support for querying this event is already present in
query-block by means of the 'io-status' key. Also, the new 'nospace'
BLOCK_IO_ERROR field shares the same semantics with 'io-status',
which basically means that werror= has to be set to either
'stop' or 'enospc' to enable 'nospace'.
Finally, this commit also updates the 'io-status' key doc in the
schema with a list of supported device models.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/block-core.json | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json index a685d02728..68945c26b2 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -336,6 +336,7 @@ # # @io-status: #optional @BlockDeviceIoStatus. Only present if the device # supports it and the VM is configured to stop on errors +# (supported device models: virtio-blk, ide, scsi-disk) # # @inserted: #optional @BlockDeviceInfo describing the device if media is # present @@ -1587,6 +1588,11 @@ # # @action: action that has been taken # +# @nospace: #optional true if I/O error was caused due to a no-space +# condition. This key is only present if query-block's +# io-status is present, please see query-block documentation +# for more information (since: 2.2) +# # Note: If action is "stop", a STOP event will eventually follow the # BLOCK_IO_ERROR event # @@ -1594,7 +1600,7 @@ ## { 'event': 'BLOCK_IO_ERROR', 'data': { 'device': 'str', 'operation': 'IoOperationType', - 'action': 'BlockErrorAction' } } + 'action': 'BlockErrorAction', '*nospace': 'bool' } } ## # @BLOCK_JOB_COMPLETED |