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block: Add BlockBackendRootState

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This structure will store some of the state of the root BDS if the BDS
tree is removed, so that state can be restored once a new BDS tree is
inserted.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2015-10-19 17:53:24 +02:00 • committed by Kevin Wolf
parent 973f2ddf7b
commit 281d22d86c
4 changed files with 53 additions and 0 deletions
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40
block/block-backend.c
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@ -13,6 +13,7 @@
#include "sysemu/block-backend.h"
#include "block/block_int.h"
#include "block/blockjob.h"
#include "block/throttle-groups.h"
#include "sysemu/blockdev.h"
#include "sysemu/sysemu.h"
#include "qapi-event.h"
@ -37,6 +38,10 @@ struct BlockBackend {
/* the block size for which the guest device expects atomicity */
int guest_block_size;
/* If the BDS tree is removed, some of its options are stored here (which
* can be used to restore those options in the new BDS on insert) */
BlockBackendRootState root_state;
/* I/O stats (display with "info blockstats"). */
BlockAcctStats stats;
@ -161,6 +166,10 @@ static void blk_delete(BlockBackend *blk)
bdrv_unref(blk->bs);
blk->bs = NULL;
}
if (blk->root_state.throttle_state) {
g_free(blk->root_state.throttle_group);
throttle_group_unref(blk->root_state.throttle_state);
}
/* Avoid double-remove after blk_hide_on_behalf_of_hmp_drive_del() */
if (blk->name[0]) {
QTAILQ_REMOVE(&blk_backends, blk, link);
@ -1067,3 +1076,34 @@ int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
{
return bdrv_probe_geometry(blk->bs, geo);
}
/*
* Updates the BlockBackendRootState object with data from the currently
* attached BlockDriverState.
*/
void blk_update_root_state(BlockBackend *blk)
{
assert(blk->bs);
blk->root_state.open_flags = blk->bs->open_flags;
blk->root_state.read_only = blk->bs->read_only;
blk->root_state.detect_zeroes = blk->bs->detect_zeroes;
if (blk->root_state.throttle_group) {
g_free(blk->root_state.throttle_group);
throttle_group_unref(blk->root_state.throttle_state);
}
if (blk->bs->throttle_state) {
const char *name = throttle_group_get_name(blk->bs);
blk->root_state.throttle_group = g_strdup(name);
blk->root_state.throttle_state = throttle_group_incref(name);
} else {
blk->root_state.throttle_group = NULL;
blk->root_state.throttle_state = NULL;
}
}
BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
{
return &blk->root_state;
}