From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
To: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>,
qemu-block@nongnu.org
Cc: qemu-devel@nongnu.org, kwolf@redhat.com, mreitz@redhat.com,
stefanha@redhat.com, fam@euphon.net, jsnow@redhat.com,
armbru@redhat.com, eblake@redhat.com, den@openvz.org
Subject: Re: [PATCH v10 4/9] copy-on-read: pass base node name to COR driver
Date: Mon, 5 Oct 2020 17:50:48 +0300 [thread overview]
Message-ID: <e59fb7ab-9454-e4f1-db8d-c6916e65a8a3@virtuozzo.com> (raw)
In-Reply-To: <1601383109-110988-5-git-send-email-andrey.shinkevich@virtuozzo.com>
29.09.2020 15:38, Andrey Shinkevich wrote:
> To limit the guest's COR operations by the base node in the backing
Better to drop "guest's " word. We don't to limit the guest in any
> 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.
>
Oops. Seems we want bottom-node, not base, in according with stream job
> 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
>
--
Best regards,
Vladimir
next prev parent reply other threads:[~2020-10-05 14:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 12:38 [PATCH v10 0/9] Apply COR-filter to the block-stream permanently Andrey Shinkevich via
2020-09-29 12:38 ` [PATCH v10 1/9] copy-on-read: Support preadv/pwritev_part functions Andrey Shinkevich via
2020-09-29 12:38 ` [PATCH v10 2/9] copy-on-read: add filter append/drop functions Andrey Shinkevich via
2020-10-05 13:34 ` Vladimir Sementsov-Ogievskiy
2020-10-05 16:23 ` Andrey Shinkevich
2020-09-29 12:38 ` [PATCH v10 3/9] qapi: add filter-node-name to block-stream Andrey Shinkevich via
2020-09-29 12:38 ` [PATCH v10 4/9] copy-on-read: pass base node name to COR driver Andrey Shinkevich via
2020-10-05 14:50 ` Vladimir Sementsov-Ogievskiy [this message]
2020-09-29 12:38 ` [PATCH v10 5/9] copy-on-read: limit guest COR activity to base in " Andrey Shinkevich via
2020-10-05 14:58 ` Vladimir Sementsov-Ogievskiy
2020-10-05 16:45 ` Andrey Shinkevich
2020-10-05 18:18 ` Andrey Shinkevich
2020-09-29 12:38 ` [PATCH v10 6/9] copy-on-read: skip non-guest reads if no copy needed Andrey Shinkevich via
2020-10-07 10:06 ` Vladimir Sementsov-Ogievskiy
2020-10-07 19:01 ` Andrey Shinkevich
2020-10-07 19:28 ` Vladimir Sementsov-Ogievskiy
2020-10-09 12:56 ` Andrey Shinkevich
2020-09-29 12:38 ` [PATCH v10 7/9] stream: skip filters when writing backing file name to QCOW2 header Andrey Shinkevich via
2020-10-07 10:14 ` Vladimir Sementsov-Ogievskiy
2020-09-29 12:38 ` [PATCH v10 8/9] block: remove unused backing-file name parameter Andrey Shinkevich via
2020-10-07 10:21 ` Vladimir Sementsov-Ogievskiy
2020-10-07 19:32 ` Andrey Shinkevich
2020-09-29 12:38 ` [PATCH v10 9/9] block: apply COR-filter to block-stream jobs Andrey Shinkevich via
2020-10-07 17:27 ` Andrey Shinkevich
2020-10-07 17:39 ` Andrey Shinkevich
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