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[Qemu-devel] [RFC PATCH 25/36] mirror: add support for on_source_error/o
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [RFC PATCH 25/36] mirror: add support for on_source_error/on_target_error |
Date: |
Fri, 15 Jun 2012 17:05:48 +0200 |
(Mostly untested).
Signed-off-by: Paolo Bonzini <address@hidden>
---
block/mirror.c | 50 +++++++++++++++++++++++++++++++++++++++++---------
block_int.h | 4 ++++
blockdev.c | 14 ++++++++++++--
hmp.c | 3 ++-
qapi-schema.json | 7 ++++++-
qmp-commands.hx | 8 +++++++-
6 files changed, 72 insertions(+), 14 deletions(-)
diff --git a/block/mirror.c b/block/mirror.c
index 4c1582d..bdcbe3e 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -32,11 +32,14 @@ typedef struct MirrorBlockJob {
RateLimit limit;
BlockDriverState *target;
MirrorSyncMode mode;
+ BlockdevOnError on_source_error, on_target_error;
+ bool synced;
int64_t sector_num;
void *buf;
} MirrorBlockJob;
-static int coroutine_fn mirror_iteration(MirrorBlockJob *s)
+static int coroutine_fn mirror_iteration(MirrorBlockJob *s,
+ BlockErrorAction *p_action)
{
BlockDriverState *source = s->common.bs;
BlockDriverState *target = s->target;
@@ -58,9 +61,23 @@ static int coroutine_fn mirror_iteration(MirrorBlockJob *s)
ret = bdrv_co_readv(source, s->sector_num, nb_sectors, &qiov);
if (ret < 0) {
- return ret;
+ *p_action = block_job_error_action(&s->common, source,
+ s->on_source_error, true, -ret);
+ goto fail;
}
- return bdrv_co_writev(target, s->sector_num, nb_sectors, &qiov);
+ ret = bdrv_co_writev(target, s->sector_num, nb_sectors, &qiov);
+ if (ret < 0) {
+ *p_action = block_job_error_action(&s->common, target,
+ s->on_target_error, false, -ret);
+ s->synced = false;
+ goto fail;
+ }
+ return 0;
+
+fail:
+ /* Try again later. */
+ bdrv_set_dirty(source, s->sector_num, nb_sectors);
+ return ret;
}
static void coroutine_fn mirror_run(void *opaque)
@@ -70,7 +87,6 @@ static void coroutine_fn mirror_run(void *opaque)
int64_t sector_num, end;
int ret = 0;
int n;
- bool synced = false;
if (block_job_is_cancelled(&s->common)) {
goto immediate_exit;
@@ -116,8 +132,9 @@ static void coroutine_fn mirror_run(void *opaque)
bool should_complete;
if (bdrv_get_dirty_count(bs) != 0) {
- ret = mirror_iteration(s);
- if (ret < 0) {
+ BlockErrorAction action = BDRV_ACTION_REPORT;
+ ret = mirror_iteration(s, &action);
+ if (ret < 0 && action == BDRV_ACTION_REPORT) {
break;
}
}
@@ -128,11 +145,11 @@ static void coroutine_fn mirror_run(void *opaque)
* I/O and report completion, so that drive-reopen can be
* used to pivot to the mirroring target.
*/
- synced = true;
+ s->synced = true;
s->common.offset = end * BDRV_SECTOR_SIZE;
}
- should_complete = synced && block_job_is_cancelled(&s->common);
+ should_complete = s->synced && block_job_is_cancelled(&s->common);
if (should_complete) {
/* The dirty bitmap is not updated while operations are pending.
* If we're about to exit, wait for pending operations before
@@ -147,7 +164,7 @@ static void coroutine_fn mirror_run(void *opaque)
ret = 0;
cnt = bdrv_get_dirty_count(bs);
- if (synced) {
+ if (s->synced) {
if (!should_complete) {
delay_ns = (cnt == 0 ? SLICE_TIME : 0);
block_job_sleep_ns(&s->common, rt_clock, delay_ns);
@@ -185,6 +202,7 @@ static void coroutine_fn mirror_run(void *opaque)
immediate_exit:
g_free(s->buf);
bdrv_set_dirty_tracking(bs, false);
+ bdrv_iostatus_disable(s->target);
bdrv_close(s->target);
bdrv_delete(s->target);
block_job_completed(&s->common, ret);
@@ -201,6 +219,13 @@ static void mirror_set_speed(BlockJob *job, int64_t speed,
Error **errp)
ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
}
+static void mirror_iostatus_reset(BlockJob *job)
+{
+ MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
+
+ bdrv_iostatus_reset(s->target);
+}
+
static void mirror_query(BlockJob *job, BlockJobInfo *info)
{
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
@@ -215,11 +240,14 @@ static BlockJobType mirror_job_type = {
.instance_size = sizeof(MirrorBlockJob),
.job_type = "mirror",
.set_speed = mirror_set_speed,
+ .iostatus_reset= mirror_iostatus_reset,
.query = mirror_query,
};
void mirror_start(BlockDriverState *bs, BlockDriverState *target,
int64_t speed, MirrorSyncMode mode,
+ BlockdevOnError on_source_error,
+ BlockdevOnError on_target_error,
BlockDriverCompletionFunc *cb,
void *opaque, Error **errp)
{
@@ -230,9 +258,13 @@ void mirror_start(BlockDriverState *bs, BlockDriverState
*target,
return;
}
+ s->on_source_error = on_source_error;
+ s->on_target_error = on_target_error;
s->target = target;
s->mode = mode;
bdrv_set_dirty_tracking(bs, true);
+ bdrv_set_on_error(s->target, on_target_error, on_target_error);
+ bdrv_iostatus_enable(s->target);
s->common.co = qemu_coroutine_create(mirror_run);
trace_mirror_start(bs, s, s->common.co, opaque);
qemu_coroutine_enter(s->common.co, s);
diff --git a/block_int.h b/block_int.h
index d7e1928..599eb37 100644
--- a/block_int.h
+++ b/block_int.h
@@ -312,6 +312,8 @@ void stream_start(BlockDriverState *bs, BlockDriverState
*base,
* @target: Block device to write to.
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
* @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.
* @cb: Completion function for the job.
* @opaque: Opaque pointer value passed to @cb.
* @errp: Error object.
@@ -323,6 +325,8 @@ void stream_start(BlockDriverState *bs, BlockDriverState
*base,
*/
void mirror_start(BlockDriverState *bs, BlockDriverState *target,
int64_t speed, MirrorSyncMode mode,
+ BlockdevOnError on_source_error,
+ BlockdevOnError on_target_error,
BlockDriverCompletionFunc *cb,
void *opaque, Error **errp);
diff --git a/blockdev.c b/blockdev.c
index 29ecadc..4000d16 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -835,7 +835,10 @@ void qmp_drive_mirror(const char *device, const char
*target,
bool has_format, const char *format,
enum MirrorSyncMode sync,
bool has_mode, enum NewImageMode mode,
- bool has_speed, int64_t speed, Error **errp)
+ bool has_speed, int64_t speed,
+ bool has_on_source_error, BlockdevOnError
on_source_error,
+ bool has_on_target_error, BlockdevOnError
on_target_error,
+ Error **errp)
{
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
@@ -846,6 +849,12 @@ void qmp_drive_mirror(const char *device, const char
*target,
uint64_t size;
int ret;
+ if (!has_on_source_error) {
+ on_source_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_on_target_error) {
+ on_target_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
if (!has_mode) {
mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
@@ -929,7 +938,8 @@ void qmp_drive_mirror(const char *device, const char
*target,
return;
}
- mirror_start(bs, target_bs, speed, sync, block_job_cb, bs, &local_err);
+ mirror_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
+ block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_delete(target_bs);
error_propagate(errp, local_err);
diff --git a/hmp.c b/hmp.c
index 2dfc477..ce0d040 100644
--- a/hmp.c
+++ b/hmp.c
@@ -717,7 +717,8 @@ void hmp_drive_mirror(Monitor *mon, const QDict *qdict)
qmp_drive_mirror(device, filename, !!format, format,
full ? MIRROR_SYNC_MODE_FULL : MIRROR_SYNC_MODE_TOP,
- true, mode, false, 0, &errp);
+ true, mode, false, 0,
+ false, 0, false, 0, &errp);
hmp_handle_error(mon, &errp);
}
diff --git a/qapi-schema.json b/qapi-schema.json
index 7b619e9..2ee988b 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1379,6 +1379,10 @@
# (all the disk, only the sectors allocated in the topmost image, or
# only new I/O).
#
+# @on_source_error: #optional the action to take on an error on the source
+#
+# @on_target_error: #optional the action to take on an error on the target
+#
# Returns: nothing on success
# If @device is not a valid block device, DeviceNotFound
# If @target can't be opened, OpenFileFailed
@@ -1389,7 +1393,8 @@
{ 'command': 'drive-mirror',
'data': { 'device': 'str', 'target': 'str', '*format': 'str',
'sync': 'MirrorSyncMode', '*mode': 'NewImageMode',
- '*speed': 'int' } }
+ '*speed': 'int', '*on_source_error': 'BlockdevOnError',
+ '*on_target_error': 'BlockdevOnError' } }
##
# @migrate_cancel
diff --git a/qmp-commands.hx b/qmp-commands.hx
index cccea2f..aff1660 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -833,7 +833,8 @@ EQMP
{
.name = "drive-mirror",
- .args_type = "sync:s,device:B,target:s,sync:s?,format:s?",
+ .args_type = "sync:s,device:B,target:s,sync:s?,format:s?,"
+ "on_source_error:s?,on_target_error:s?",
.mhandler.cmd_new = qmp_marshal_input_drive_mirror,
},
@@ -860,6 +861,11 @@ Arguments:
possibilities include "full" for all the disk, "top" for only the sectors
allocated in the topmost image, or "none" to only replicate new I/O
(MirrorSyncMode).
+- "on_source_error": the action to take on an error on the source
+ (BlockdevOnError)
+- "on_target_error": the action to take on an error on the target
+ (BlockdevOnError)
+
Example:
--
1.7.10.2
- Re: [Qemu-devel] [RFC PATCH 12/36] block: sort BlockDeviceIoStatus errors by severity, (continued)
- [Qemu-devel] [RFC PATCH 11/36] block: reorganize io error code, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 15/36] qemu-iotests: add tests for streaming error handling, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 13/36] block: introduce block job error, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 20/36] block: forward bdrv_iostatus_reset to block job, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 21/36] block: introduce new dirty bitmap functionality, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 22/36] block: add mirror job, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 19/36] block: add target info to QMP query-blockjobs command, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 25/36] mirror: add support for on_source_error/on_target_error,
Paolo Bonzini <=
- [Qemu-devel] [RFC PATCH 24/36] mirror: support querying target file, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 29/36] mirror: implement completion, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 34/36] block: return count of dirty sectors, not chunks, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 33/36] mirror: perform COW if the cluster size is bigger than the granularity, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 26/36] block: live snapshot documentation tweaks, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 35/36] block: allow customizing the granularity of the dirty bitmap, Paolo Bonzini, 2012/06/15
- [Qemu-devel] [RFC PATCH 36/36] mirror: allow customizing the granularity, Paolo Bonzini, 2012/06/15