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Re: [Qemu-block] [PATCH v5 3/6] The discard flag for block stream operat
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-block] [PATCH v5 3/6] The discard flag for block stream operation |
Date: |
Thu, 3 Jan 2019 10:19:27 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Andrey Shinkevich (address@hidden) wrote:
> Adding a parameter to QMP block-stream command to allow discarding
> blocks in the backing chain while blocks are being copied to the
> active layer.
>
> Signed-off-by: Andrey Shinkevich <address@hidden>
> ---
> block/copy-on-read.c | 24 ++++++++++++++++++++++++
> block/stream.c | 3 +--
> blockdev.c | 8 +++++++-
> hmp-commands.hx | 4 ++--
> hmp.c | 4 +++-
> include/block/block_int.h | 2 +-
> qapi/block-core.json | 5 ++++-
> 7 files changed, 42 insertions(+), 8 deletions(-)
>
> diff --git a/block/copy-on-read.c b/block/copy-on-read.c
> index 64dcc42..bf7580e 100644
> --- a/block/copy-on-read.c
> +++ b/block/copy-on-read.c
> @@ -22,11 +22,22 @@
>
> #include "qemu/osdep.h"
> #include "block/block_int.h"
> +#include "qapi/qmp/qdict.h"
> +
> +typedef struct BDRVCORState {
> + bool discard;
> +} BDRVCORState;
>
>
> static int cor_open(BlockDriverState *bs, QDict *options, int flags,
> Error **errp)
> {
> + if (qdict_haskey(options, "driver.discard")) {
> + BDRVCORState *s = bs->opaque;
> + s->discard = qdict_get_bool(options, "driver.discard");
> + qdict_del(options, "driver.discard");
> + }
> +
> bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, false,
> errp);
> if (!bs->file) {
> @@ -66,6 +77,11 @@ static void cor_child_perm(BlockDriverState *bs, BdrvChild
> *c,
> (c->perm & PERM_UNCHANGED);
> *nshared = (shared & PERM_PASSTHROUGH) |
> (c->shared_perm & PERM_UNCHANGED);
> +
> + BDRVCORState *s = bs->opaque;
> + if (s->discard) {
> + *nshared |= BLK_PERM_WRITE;
> + }
> }
>
>
> @@ -134,8 +150,15 @@ static bool
> cor_recurse_is_first_non_filter(BlockDriverState *bs,
> }
>
>
> +static int cor_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
> +{
> + return bdrv_get_info(bs->file->bs, bdi);
> +}
> +
> +
> BlockDriver bdrv_copy_on_read = {
> .format_name = "copy-on-read",
> + .instance_size = sizeof(BDRVCORState),
>
> .bdrv_open = cor_open,
> .bdrv_child_perm = cor_child_perm,
> @@ -148,6 +171,7 @@ BlockDriver bdrv_copy_on_read = {
> .bdrv_co_pwrite_zeroes = cor_co_pwrite_zeroes,
> .bdrv_co_pdiscard = cor_co_pdiscard,
>
> + .bdrv_get_info = cor_get_info,
> .bdrv_eject = cor_eject,
> .bdrv_lock_medium = cor_lock_medium,
>
> diff --git a/block/stream.c b/block/stream.c
> index af2eebf..b160eee 100644
> --- a/block/stream.c
> +++ b/block/stream.c
> @@ -465,13 +465,12 @@ static const BlockJobDriver stream_job_driver = {
>
> void stream_start(const char *job_id, BlockDriverState *bs,
> BlockDriverState *base, const char *backing_file_str,
> - int creation_flags, int64_t speed,
> + int creation_flags, int64_t speed, bool discard,
> BlockdevOnError on_error, Error **errp)
> {
> StreamBlockJob *s;
> BlockDriverState *iter;
> bool bs_read_only;
> - const bool discard = false;
> int node_shared_flags = BLK_PERM_CONSISTENT_READ |
> BLK_PERM_WRITE_UNCHANGED;
> int ret;
>
> diff --git a/blockdev.c b/blockdev.c
> index a6f71f9..6a53cb7 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -3138,6 +3138,7 @@ void qmp_block_stream(bool has_job_id, const char
> *job_id, const char *device,
> bool has_base_node, const char *base_node,
> bool has_backing_file, const char *backing_file,
> bool has_speed, int64_t speed,
> + bool has_discard, bool discard,
> bool has_on_error, BlockdevOnError on_error,
> bool has_auto_finalize, bool auto_finalize,
> bool has_auto_dismiss, bool auto_dismiss,
> @@ -3154,6 +3155,10 @@ void qmp_block_stream(bool has_job_id, const char
> *job_id, const char *device,
> on_error = BLOCKDEV_ON_ERROR_REPORT;
> }
>
> + if (!has_discard) {
> + discard = false;
> + }
> +
> bs = bdrv_lookup_bs(device, device, errp);
> if (!bs) {
> return;
> @@ -3218,7 +3223,8 @@ void qmp_block_stream(bool has_job_id, const char
> *job_id, const char *device,
> }
>
> stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
> - job_flags, has_speed ? speed : 0, on_error, &local_err);
> + job_flags, has_speed ? speed : 0,
> + discard, on_error, &local_err);
> if (local_err) {
> error_propagate(errp, local_err);
> goto out;
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index ba71558..12806db 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -95,8 +95,8 @@ ETEXI
>
> {
> .name = "block_stream",
> - .args_type = "device:B,speed:o?,base:s?",
> - .params = "device [speed [base]]",
> + .args_type = "device:B,speed:o?,base:s?,discard:-d",
> + .params = "device [speed [base]] [-d]",
> .help = "copy data from a backing file into a block device",
> .cmd = hmp_block_stream,
> },
> diff --git a/hmp.c b/hmp.c
> index 80aa5ab..353a164 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -1923,9 +1923,11 @@ void hmp_block_stream(Monitor *mon, const QDict *qdict)
> const char *device = qdict_get_str(qdict, "device");
> const char *base = qdict_get_try_str(qdict, "base");
> int64_t speed = qdict_get_try_int(qdict, "speed", 0);
> + bool discard = qdict_get_try_bool(qdict, "discard", false);
>
> qmp_block_stream(true, device, device, base != NULL, base, false, NULL,
> - false, NULL, qdict_haskey(qdict, "speed"), speed, true,
> + false, NULL, qdict_haskey(qdict, "speed"), speed,
> + true, discard, true,
> BLOCKDEV_ON_ERROR_REPORT, false, false, false, false,
> &error);
Yes, I think that's fine from the HMP side (that line is 'true' for
has_discard, discard, true for has_on_error which is the true that you
moved from the end of the previous line).
Acked-by: Dr. David Alan Gilbert <address@hidden>
>
> diff --git a/include/block/block_int.h b/include/block/block_int.h
> index f605622..2660336 100644
> --- a/include/block/block_int.h
> +++ b/include/block/block_int.h
> @@ -970,7 +970,7 @@ int is_windows_drive(const char *filename);
> */
> void stream_start(const char *job_id, BlockDriverState *bs,
> BlockDriverState *base, const char *backing_file_str,
> - int creation_flags, int64_t speed,
> + int creation_flags, int64_t speed, bool discard,
> BlockdevOnError on_error, Error **errp);
>
> /**
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index 762000f..5005c57 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -2337,6 +2337,9 @@
> #
> # @speed: the maximum speed, in bytes per second
> #
> +# @discard: true to delete blocks duplicated in old backing files.
> +# (default: false). Since 4.0.
> +#
> # @on-error: the action to take on an error (default report).
> # 'stop' and 'enospc' can only be used if the block device
> # supports io-status (see BlockInfo). Since 1.3.
> @@ -2369,7 +2372,7 @@
> { 'command': 'block-stream',
> 'data': { '*job-id': 'str', 'device': 'str', '*base': 'str',
> '*base-node': 'str', '*backing-file': 'str', '*speed': 'int',
> - '*on-error': 'BlockdevOnError',
> + '*discard': 'bool', '*on-error': 'BlockdevOnError',
> '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }
>
> ##
> --
> 1.8.3.1
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
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