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authorFam Zheng <famz@redhat.com>2015-06-08 13:56:08 +0800
committerStefan Hajnoczi <stefanha@redhat.com>2015-07-02 10:06:23 +0100
commit0fc9f8ea2800b76eaea20a8a3a91fbeeb4bfa81b (patch)
tree0e38faa50c9b3d149853693e64d945b15d351405
parentba3f0e2545c365ebe1dbddb0e53058710d41881e (diff)
qmp: Add optional bool "unmap" to drive-mirror
If specified as "true", it allows discarding on target sectors where source is not allocated. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
-rw-r--r--block/mirror.c8
-rw-r--r--blockdev.c5
-rw-r--r--hmp.c2
-rw-r--r--include/block/block_int.h2
-rw-r--r--qapi/block-core.json8
-rw-r--r--qmp-commands.hx3
6 files changed, 24 insertions, 4 deletions
diff --git a/block/mirror.c b/block/mirror.c
index 49aa8bc1b1..4be06a5082 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -58,6 +58,7 @@ typedef struct MirrorBlockJob {
int in_flight;
int sectors_in_flight;
int ret;
+ bool unmap;
} MirrorBlockJob;
typedef struct MirrorOp {
@@ -652,6 +653,7 @@ 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,
@@ -686,6 +688,7 @@ 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, NULL, errp);
if (!s->dirty_bitmap) {
@@ -704,6 +707,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
int64_t speed, uint32_t granularity, int64_t buf_size,
MirrorSyncMode mode, BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
+ bool unmap,
BlockCompletionFunc *cb,
void *opaque, Error **errp)
{
@@ -718,7 +722,7 @@ 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);
}
@@ -766,7 +770,7 @@ 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 4d5e016e62..7fee519a1c 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2655,6 +2655,7 @@ 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;
@@ -2686,6 +2687,9 @@ 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_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
@@ -2827,6 +2831,7 @@ 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 070aaf814f..dcc66f159a 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1061,7 +1061,7 @@ 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 44a5cf7557..83ed1a5f7a 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -612,6 +612,7 @@ 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.
@@ -626,6 +627,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
int64_t speed, uint32_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 ed3f8902e5..7b2efb8678 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -975,6 +975,11 @@
# @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
@@ -987,7 +992,8 @@
'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' } }
##
# @BlockDirtyBitmap
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 87fa1722fb..e1bcc60380 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1503,6 +1503,7 @@ 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,
},
@@ -1542,6 +1543,8 @@ 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