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[Qemu-devel] [PATCH] block: Split BLOCK_OP_TYPE_COMMIT to BLOCK_OP_TYPE_
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH] block: Split BLOCK_OP_TYPE_COMMIT to BLOCK_OP_TYPE_COMMIT_{SOURCE, TARGET} |
Date: |
Thu, 11 Sep 2014 13:14:00 +0800 |
Like BLOCK_OP_TYPE_BACKUP_SOURCE and BLOCK_OP_TYPE_BACKUP_TARGET,
block-commit involves two asymmetric devices.
This change is not user-visible (yet), because commit only works with
device names.
But once we enable backing reference in blockdev-add, or specifying
node-name in block-commit command, we don't want the user to start two
commit jobs on the same backing chain, which will corrupt things because
of the final bdrv_swap.
Before we have per category blockers, splitting this type is still
better.
Signed-off-by: Fam Zheng <address@hidden>
---
block.c | 6 +++---
blockdev.c | 6 +++++-
include/block/block.h | 3 ++-
3 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/block.c b/block.c
index d06dd51..f47e6a0 100644
--- a/block.c
+++ b/block.c
@@ -1168,7 +1168,7 @@ void bdrv_set_backing_hd(BlockDriverState *bs,
BlockDriverState *backing_hd)
bdrv_op_block_all(bs->backing_hd, bs->backing_blocker);
/* Otherwise we won't be able to commit due to check in bdrv_commit */
- bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT,
+ bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET,
bs->backing_blocker);
out:
bdrv_refresh_limits(bs, NULL);
@@ -2251,8 +2251,8 @@ int bdrv_commit(BlockDriverState *bs)
return -ENOTSUP;
}
- if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, NULL) ||
- bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, NULL)) {
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) ||
+ bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, NULL))
{
return -EBUSY;
}
diff --git a/blockdev.c b/blockdev.c
index e919566..095804a 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1956,7 +1956,7 @@ void qmp_block_commit(const char *device,
return;
}
- if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) {
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
return;
}
@@ -1985,6 +1985,10 @@ void qmp_block_commit(const char *device,
return;
}
+ if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
+ return;
+ }
+
/* Do not allow attempts to commit an image into itself */
if (top_bs == base_bs) {
error_setg(errp, "cannot commit an image into itself");
diff --git a/include/block/block.h b/include/block/block.h
index 8f4ad16..3b0d39d 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -165,7 +165,8 @@ typedef enum BlockOpType {
BLOCK_OP_TYPE_BACKUP_SOURCE,
BLOCK_OP_TYPE_BACKUP_TARGET,
BLOCK_OP_TYPE_CHANGE,
- BLOCK_OP_TYPE_COMMIT,
+ BLOCK_OP_TYPE_COMMIT_SOURCE,
+ BLOCK_OP_TYPE_COMMIT_TARGET,
BLOCK_OP_TYPE_DATAPLANE,
BLOCK_OP_TYPE_DRIVE_DEL,
BLOCK_OP_TYPE_EJECT,
--
1.9.3
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- [Qemu-devel] [PATCH] block: Split BLOCK_OP_TYPE_COMMIT to BLOCK_OP_TYPE_COMMIT_{SOURCE, TARGET},
Fam Zheng <=