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[Qemu-devel] [PATCH v4 1/7] block: Add status callback to bdrv_amend_opt
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH v4 1/7] block: Add status callback to bdrv_amend_options() |
Date: |
Mon, 27 Oct 2014 11:12:50 +0100 |
Depending on the changed options and the image format,
bdrv_amend_options() may take a significant amount of time. In these
cases, a way to be informed about the operation's status is desirable.
Since the operation is rather complex and may fundamentally change the
image, implementing it as AIO or a coroutine does not seem feasible. On
the other hand, implementing it as a block job would be significantly
more difficult than a simple callback and would not add benefits other
than progress report to the amending operation, because it should not
actually be run as a block job at all.
A callback may not be very pretty, but it's very easy to implement and
perfectly fits its purpose here.
Signed-off-by: Max Reitz <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: BenoƮt Canet <address@hidden>
---
block.c | 5 +++--
block/qcow2.c | 3 ++-
include/block/block.h | 8 +++++++-
include/block/block_int.h | 3 ++-
qemu-img.c | 2 +-
5 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/block.c b/block.c
index 88f6d9b..4228cb7 100644
--- a/block.c
+++ b/block.c
@@ -5750,12 +5750,13 @@ void bdrv_add_before_write_notifier(BlockDriverState
*bs,
notifier_with_return_list_add(&bs->before_write_notifiers, notifier);
}
-int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts)
+int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts,
+ BlockDriverAmendStatusCB *status_cb)
{
if (!bs->drv->bdrv_amend_options) {
return -ENOTSUP;
}
- return bs->drv->bdrv_amend_options(bs, opts);
+ return bs->drv->bdrv_amend_options(bs, opts, status_cb);
}
/* This function will be called by the bdrv_recurse_is_first_non_filter method
diff --git a/block/qcow2.c b/block/qcow2.c
index d031515..a121a63 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2424,7 +2424,8 @@ static int qcow2_downgrade(BlockDriverState *bs, int
target_version)
return 0;
}
-static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts)
+static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
+ BlockDriverAmendStatusCB *status_cb)
{
BDRVQcowState *s = bs->opaque;
int old_version = s->qcow_version, new_version = old_version;
diff --git a/include/block/block.h b/include/block/block.h
index 341054d..2ff96e5 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -268,7 +268,13 @@ typedef enum {
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
-int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts);
+/* The units of offset and total_work_size may be chosen arbitrarily by the
+ * block driver; total_work_size may change during the course of the amendment
+ * operation */
+typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset,
+ int64_t total_work_size);
+int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
+ BlockDriverAmendStatusCB *status_cb);
/* external snapshots */
bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8898c6c..df9e349 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -232,7 +232,8 @@ struct BlockDriver {
int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
BdrvCheckMode fix);
- int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts);
+ int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts,
+ BlockDriverAmendStatusCB *status_cb);
void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
diff --git a/qemu-img.c b/qemu-img.c
index 731502c..58973ef 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2867,7 +2867,7 @@ static int img_amend(int argc, char **argv)
goto out;
}
- ret = bdrv_amend_options(bs, opts);
+ ret = bdrv_amend_options(bs, opts, NULL);
if (ret < 0) {
error_report("Error while amending options: %s", strerror(-ret));
goto out;
--
1.9.3
- [Qemu-devel] [PATCH v4 0/7] block/qcow2: Improve zero cluster expansion, Max Reitz, 2014/10/27
- [Qemu-devel] [PATCH v4 1/7] block: Add status callback to bdrv_amend_options(),
Max Reitz <=
- [Qemu-devel] [PATCH v4 2/7] qemu-img: Add progress output for amend, Max Reitz, 2014/10/27
- [Qemu-devel] [PATCH v4 3/7] qemu-img: Fix insignificant memleak, Max Reitz, 2014/10/27
- [Qemu-devel] [PATCH v4 4/7] block/qcow2: Implement status CB for amend, Max Reitz, 2014/10/27
- [Qemu-devel] [PATCH v4 5/7] block/qcow2: Make get_refcount() global, Max Reitz, 2014/10/27
- [Qemu-devel] [PATCH v4 6/7] block/qcow2: Simplify shared L2 handling in amend, Max Reitz, 2014/10/27
- [Qemu-devel] [PATCH v4 7/7] iotests: Expand test 061, Max Reitz, 2014/10/27
- Re: [Qemu-devel] [PATCH v4 0/7] block/qcow2: Improve zero cluster expansion, Kevin Wolf, 2014/10/28
- Re: [Qemu-devel] [PATCH v4 0/7] block/qcow2: Improve zero cluster expansion, Stefan Hajnoczi, 2014/10/29