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[PATCH v10 4/9] copy-on-read: pass base node name to COR driver
From: |
Andrey Shinkevich |
Subject: |
[PATCH v10 4/9] copy-on-read: pass base node name to COR driver |
Date: |
Tue, 29 Sep 2020 15:38:24 +0300 |
To limit the guest's COR operations by the base node in the backing
chain during stream job, pass the base node name to the copy-on-read
driver. The rest of the functionality will be implemented in the patch
that follows.
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
---
block/copy-on-read.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/block/copy-on-read.c b/block/copy-on-read.c
index 3c8231f..e04092f 100644
--- a/block/copy-on-read.c
+++ b/block/copy-on-read.c
@@ -24,19 +24,23 @@
#include "block/block_int.h"
#include "qemu/module.h"
#include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qdict.h"
#include "block/copy-on-read.h"
typedef struct BDRVStateCOR {
bool active;
+ BlockDriverState *base_bs;
} BDRVStateCOR;
static int cor_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
+ BlockDriverState *base_bs = NULL;
BDRVStateCOR *state = bs->opaque;
+ const char *base_node = qdict_get_try_str(options, "base");
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
@@ -52,7 +56,16 @@ static int cor_open(BlockDriverState *bs, QDict *options,
int flags,
((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
bs->file->bs->supported_zero_flags);
+ if (base_node) {
+ qdict_del(options, "base");
+ base_bs = bdrv_lookup_bs(NULL, base_node, errp);
+ if (!base_bs) {
+ error_setg(errp, QERR_BASE_NOT_FOUND, base_node);
+ return -EINVAL;
+ }
+ }
state->active = true;
+ state->base_bs = base_bs;
/*
* We don't need to call bdrv_child_refresh_perms() now as the permissions
--
1.8.3.1
- [PATCH v10 0/9] Apply COR-filter to the block-stream permanently, Andrey Shinkevich, 2020/09/29
- [PATCH v10 1/9] copy-on-read: Support preadv/pwritev_part functions, Andrey Shinkevich, 2020/09/29
- [PATCH v10 2/9] copy-on-read: add filter append/drop functions, Andrey Shinkevich, 2020/09/29
- [PATCH v10 3/9] qapi: add filter-node-name to block-stream, Andrey Shinkevich, 2020/09/29
- [PATCH v10 4/9] copy-on-read: pass base node name to COR driver,
Andrey Shinkevich <=
- [PATCH v10 5/9] copy-on-read: limit guest COR activity to base in COR driver, Andrey Shinkevich, 2020/09/29
- [PATCH v10 6/9] copy-on-read: skip non-guest reads if no copy needed, Andrey Shinkevich, 2020/09/29
- [PATCH v10 7/9] stream: skip filters when writing backing file name to QCOW2 header, Andrey Shinkevich, 2020/09/29
- [PATCH v10 8/9] block: remove unused backing-file name parameter, Andrey Shinkevich, 2020/09/29
- [PATCH v10 9/9] block: apply COR-filter to block-stream jobs, Andrey Shinkevich, 2020/09/29