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authorLuiz Capitulino <lcapitulino@redhat.com>2011-09-26 17:43:50 -0300
committerKevin Wolf <kwolf@redhat.com>2011-10-11 09:41:47 +0200
commit28a7282a5d5a15527e66d3a93c93c4ccc292f694 (patch)
tree423bbb87fff9eb708c120e8b791cd69d0c78278d /block_int.h
parent449c184ed23c6238da7fcc8b965c8fcc865d72a9 (diff)
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block: Keep track of devices' I/O status
This commit adds support to the BlockDriverState type to keep track of devices' I/O status. There are three possible status: BDRV_IOS_OK (no error), BDRV_IOS_ENOSPC (no space error) and BDRV_IOS_FAILED (any other error). The distinction between no space and other errors is important because a management application may want to watch for no space in order to extend the space assigned to the VM and put it to run again. Qemu devices supporting the I/O status feature have to enable it explicitly by calling bdrv_iostatus_enable() _and_ have to be configured to stop the VM on errors (ie. werror=stop|enospc or rerror=stop). In case of multiple errors being triggered in sequence only the first one is stored. The I/O status is always reset to BDRV_IOS_OK when the 'cont' command is issued. Next commits will add support to some devices and extend the query-block/info block commands to return the I/O status information. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block_int.h')
-rw-r--r--block_int.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h
index 8c3b863..f2f4f2d 100644
--- a/block_int.h
+++ b/block_int.h
@@ -199,6 +199,7 @@ struct BlockDriverState {
drivers. They are not used by the block driver */
int cyls, heads, secs, translation;
BlockErrorAction on_read_error, on_write_error;
+ BlockIOStatus iostatus;
char device_name[32];
unsigned long *dirty_bitmap;
int64_t dirty_count;