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[PATCH v14 12/13] block/stream: add s->target_bs
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v14 12/13] block/stream: add s->target_bs |
Date: |
Sat, 5 Dec 2020 01:07:57 +0300 |
Add a direct link to target bs for convenience and to simplify
following commit which will insert COR filter above target bs.
This is a part of original commit written by Andrey.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/stream.c | 23 ++++++++++-------------
1 file changed, 10 insertions(+), 13 deletions(-)
diff --git a/block/stream.c b/block/stream.c
index a2744d07fe..a7fd8945ad 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -34,6 +34,7 @@ typedef struct StreamBlockJob {
BlockJob common;
BlockDriverState *base_overlay; /* COW overlay (stream from this) */
BlockDriverState *above_base; /* Node directly above the base */
+ BlockDriverState *target_bs;
BlockdevOnError on_error;
char *backing_file_str;
bool bs_read_only;
@@ -54,24 +55,21 @@ static void stream_abort(Job *job)
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
if (s->chain_frozen) {
- BlockJob *bjob = &s->common;
- bdrv_unfreeze_backing_chain(blk_bs(bjob->blk), s->above_base);
+ bdrv_unfreeze_backing_chain(s->target_bs, s->above_base);
}
}
static int stream_prepare(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
- BlockJob *bjob = &s->common;
- BlockDriverState *bs = blk_bs(bjob->blk);
- BlockDriverState *unfiltered_bs = bdrv_skip_filters(bs);
+ BlockDriverState *unfiltered_bs = bdrv_skip_filters(s->target_bs);
BlockDriverState *base = bdrv_filter_or_cow_bs(s->above_base);
BlockDriverState *base_unfiltered;
BlockDriverState *backing_bs;
Error *local_err = NULL;
int ret = 0;
- bdrv_unfreeze_backing_chain(bs, s->above_base);
+ bdrv_unfreeze_backing_chain(s->target_bs, s->above_base);
s->chain_frozen = false;
if (bdrv_cow_child(unfiltered_bs)) {
@@ -111,13 +109,12 @@ static void stream_clean(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockJob *bjob = &s->common;
- BlockDriverState *bs = blk_bs(bjob->blk);
/* Reopen the image back in read-only mode if necessary */
if (s->bs_read_only) {
/* Give up write permissions before making it read-only */
blk_set_perm(bjob->blk, 0, BLK_PERM_ALL, &error_abort);
- bdrv_reopen_set_read_only(bs, true, NULL);
+ bdrv_reopen_set_read_only(s->target_bs, true, NULL);
}
g_free(s->backing_file_str);
@@ -127,8 +124,7 @@ static int coroutine_fn stream_run(Job *job, Error **errp)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockBackend *blk = s->common.blk;
- BlockDriverState *bs = blk_bs(blk);
- BlockDriverState *unfiltered_bs = bdrv_skip_filters(bs);
+ BlockDriverState *unfiltered_bs = bdrv_skip_filters(s->target_bs);
bool enable_cor = !bdrv_cow_child(s->base_overlay);
int64_t len;
int64_t offset = 0;
@@ -141,7 +137,7 @@ static int coroutine_fn stream_run(Job *job, Error **errp)
return 0;
}
- len = bdrv_getlength(bs);
+ len = bdrv_getlength(s->target_bs);
if (len < 0) {
return len;
}
@@ -153,7 +149,7 @@ static int coroutine_fn stream_run(Job *job, Error **errp)
* account.
*/
if (enable_cor) {
- bdrv_enable_copy_on_read(bs);
+ bdrv_enable_copy_on_read(s->target_bs);
}
for ( ; offset < len; offset += n) {
@@ -215,7 +211,7 @@ static int coroutine_fn stream_run(Job *job, Error **errp)
}
if (enable_cor) {
- bdrv_disable_copy_on_read(bs);
+ bdrv_disable_copy_on_read(s->target_bs);
}
/* Do not remove the backing file if an error was there but ignored. */
@@ -330,6 +326,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
s->base_overlay = base_overlay;
s->above_base = above_base;
s->backing_file_str = g_strdup(backing_file_str);
+ s->target_bs = bs;
s->bs_read_only = bs_read_only;
s->chain_frozen = true;
--
2.21.3
- Re: [PATCH v14 05/13] qapi: create BlockdevOptionsCor structure for COR driver, (continued)
[PATCH v14 08/13] copy-on-read: skip non-guest reads if no copy needed, Vladimir Sementsov-Ogievskiy, 2020/12/04
[PATCH v14 10/13] qapi: block-stream: add "bottom" argument, Vladimir Sementsov-Ogievskiy, 2020/12/04
[PATCH v14 12/13] block/stream: add s->target_bs,
Vladimir Sementsov-Ogievskiy <=
[PATCH v14 11/13] iotests: 30: prepare to COR filter insertion by stream job, Vladimir Sementsov-Ogievskiy, 2020/12/04
[PATCH v14 13/13] block: apply COR-filter to block-stream jobs, Vladimir Sementsov-Ogievskiy, 2020/12/04