From a29aefaa69183d1e07837130f4873c562e8e66e5 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Mon, 13 Jul 2015 03:27:20 +0200 Subject: [PATCH 02/58] qmp: Add optional bool "unmap" to drive-mirror Message-id: <1436758047-4639-3-git-send-email-famz@redhat.com> Patchwork-id: 66960 O-Subject: [RHEL-7.2 qemu-kvm-rhev PATCH 2/9] qmp: Add optional bool "unmap" to drive-mirror Bugzilla: 1242316 RH-Acked-by: Jeffrey Cody RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Paolo Bonzini If specified as "true", it allows discarding on target sectors where source is not allocated. Signed-off-by: Fam Zheng Signed-off-by: Stefan Hajnoczi (cherry picked from commit 0fc9f8ea2800b76eaea20a8a3a91fbeeb4bfa81b) Signed-off-by: Fam Zheng Signed-off-by: Miroslav Rezanina --- block/mirror.c | 8 ++++++-- blockdev.c | 5 +++++ hmp.c | 2 +- include/block/block_int.h | 2 ++ qapi/block-core.json | 8 +++++++- qmp-commands.hx | 3 +++ 6 files changed, 24 insertions(+), 4 deletions(-) diff --git a/block/mirror.c b/block/mirror.c index 4056164..1814523 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -57,6 +57,7 @@ typedef struct MirrorBlockJob { int in_flight; int sectors_in_flight; int ret; + bool unmap; } MirrorBlockJob; typedef struct MirrorOp { @@ -660,6 +661,7 @@ static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target, int64_t buf_size, BlockdevOnError on_source_error, BlockdevOnError on_target_error, + bool unmap, BlockCompletionFunc *cb, void *opaque, Error **errp, const BlockJobDriver *driver, @@ -702,6 +704,7 @@ static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target, s->base = base; s->granularity = granularity; s->buf_size = MAX(buf_size, granularity); + s->unmap = unmap; s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, errp); if (!s->dirty_bitmap) { @@ -720,6 +723,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target, int64_t speed, int64_t granularity, int64_t buf_size, MirrorSyncMode mode, BlockdevOnError on_source_error, BlockdevOnError on_target_error, + bool unmap, BlockCompletionFunc *cb, void *opaque, Error **errp) { @@ -730,7 +734,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target, base = mode == MIRROR_SYNC_MODE_TOP ? bs->backing_hd : NULL; mirror_start_job(bs, target, replaces, speed, granularity, buf_size, - on_source_error, on_target_error, cb, opaque, errp, + on_source_error, on_target_error, unmap, cb, opaque, errp, &mirror_job_driver, is_none_mode, base); } @@ -778,7 +782,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base, bdrv_ref(base); mirror_start_job(bs, base, NULL, speed, 0, 0, - on_error, on_error, cb, opaque, &local_err, + on_error, on_error, false, cb, opaque, &local_err, &commit_active_job_driver, false, base); if (local_err) { error_propagate(errp, local_err); diff --git a/blockdev.c b/blockdev.c index 8347e30..4f81cda 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2461,6 +2461,7 @@ void qmp_drive_mirror(const char *device, const char *target, bool has_buf_size, int64_t buf_size, bool has_on_source_error, BlockdevOnError on_source_error, bool has_on_target_error, BlockdevOnError on_target_error, + bool has_unmap, bool unmap, Error **errp) { BlockBackend *blk; @@ -2492,6 +2493,9 @@ void qmp_drive_mirror(const char *device, const char *target, if (!has_buf_size) { buf_size = DEFAULT_MIRROR_BUF_SIZE; } + if (!has_unmap) { + unmap = true; + } if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", @@ -2631,6 +2635,7 @@ void qmp_drive_mirror(const char *device, const char *target, has_replaces ? replaces : NULL, speed, granularity, buf_size, sync, on_source_error, on_target_error, + unmap, block_job_cb, bs, &local_err); if (local_err != NULL) { bdrv_unref(target_bs); diff --git a/hmp.c b/hmp.c index b1423a1..b6ba8be 100644 --- a/hmp.c +++ b/hmp.c @@ -1034,7 +1034,7 @@ void hmp_drive_mirror(Monitor *mon, const QDict *qdict) false, NULL, false, NULL, full ? MIRROR_SYNC_MODE_FULL : MIRROR_SYNC_MODE_TOP, true, mode, false, 0, false, 0, false, 0, - false, 0, false, 0, &err); + false, 0, false, 0, false, true, &err); hmp_handle_error(mon, &err); } diff --git a/include/block/block_int.h b/include/block/block_int.h index dccb092..3f70228 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -579,6 +579,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base, * @mode: Whether to collapse all images in the chain to the target. * @on_source_error: The action to take upon error reading from the source. * @on_target_error: The action to take upon error writing to the target. + * @unmap: Whether to unmap target where source sectors only contain zeroes. * @cb: Completion function for the job. * @opaque: Opaque pointer value passed to @cb. * @errp: Error object. @@ -593,6 +594,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target, int64_t speed, int64_t granularity, int64_t buf_size, MirrorSyncMode mode, BlockdevOnError on_source_error, BlockdevOnError on_target_error, + bool unmap, BlockCompletionFunc *cb, void *opaque, Error **errp); diff --git a/qapi/block-core.json b/qapi/block-core.json index 8796eaf..f7acf42 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -943,6 +943,11 @@ # @on-target-error: #optional the action to take on an error on the target, # default 'report' (no limitations, since this applies to # a different block device than @device). +# @unmap: #optional Whether to try to unmap target sectors where source has +# only zero. If true, and target unallocated sectors will read as zero, +# target image sectors will be unmapped; otherwise, zeroes will be +# written. Both will result in identical contents. +# Default is true. (Since 2.4) # # Returns: nothing on success # If @device is not a valid block device, DeviceNotFound @@ -955,7 +960,8 @@ 'sync': 'MirrorSyncMode', '*mode': 'NewImageMode', '*speed': 'int', '*granularity': 'uint32', '*buf-size': 'int', '*on-source-error': 'BlockdevOnError', - '*on-target-error': 'BlockdevOnError' } } + '*on-target-error': 'BlockdevOnError', + '*unmap': 'bool' } } ## # @block_set_io_throttle: diff --git a/qmp-commands.hx b/qmp-commands.hx index 4abb90d..a835f9f 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -1477,6 +1477,7 @@ EQMP .args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?," "node-name:s?,replaces:s?," "on-source-error:s?,on-target-error:s?," + "unmap:b?," "granularity:i?,buf-size:i?", .mhandler.cmd_new = qmp_marshal_input_drive_mirror, }, @@ -1516,6 +1517,8 @@ Arguments: (BlockdevOnError, default 'report') - "on-target-error": the action to take on an error on the target (BlockdevOnError, default 'report') +- "unmap": whether the target sectors should be discarded where source has only + zeroes. (json-bool, optional, default true) The default value of the granularity is the image cluster size clamped between 4096 and 65536, if the image format defines one. If the format -- 1.8.3.1