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[Qemu-block] [PULL 31/58] block: Inactivate parents before children
From: |
Kevin Wolf |
Subject: |
[Qemu-block] [PULL 31/58] block: Inactivate parents before children |
Date: |
Thu, 11 May 2017 16:32:34 +0200 |
The proper order for inactivating block nodes is that first the parents
get inactivated and then the children. If we do things in this order, we
can assert that we didn't accidentally leave a parent activated when one
of its child nodes is inactive.
Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
block.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/block.c b/block.c
index 444a52e..170002e 100644
--- a/block.c
+++ b/block.c
@@ -762,6 +762,13 @@ static void bdrv_child_cb_drained_end(BdrvChild *child)
bdrv_drained_end(bs);
}
+static int bdrv_child_cb_inactivate(BdrvChild *child)
+{
+ BlockDriverState *bs = child->opaque;
+ assert(bs->open_flags & BDRV_O_INACTIVE);
+ return 0;
+}
+
/*
* Returns the options and flags that a temporary snapshot should get, based on
* the originally requested flags (the originally requested image will have
@@ -822,6 +829,7 @@ const BdrvChildRole child_file = {
.inherit_options = bdrv_inherited_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
/*
@@ -843,6 +851,7 @@ const BdrvChildRole child_format = {
.inherit_options = bdrv_inherited_fmt_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
static void bdrv_backing_attach(BdrvChild *c)
@@ -928,6 +937,7 @@ const BdrvChildRole child_backing = {
.inherit_options = bdrv_backing_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_end = bdrv_child_cb_drained_end,
+ .inactivate = bdrv_child_cb_inactivate,
};
static int bdrv_open_flags(BlockDriverState *bs, int flags)
@@ -4029,13 +4039,6 @@ static int bdrv_inactivate_recurse(BlockDriverState *bs,
}
}
- QLIST_FOREACH(child, &bs->children, next) {
- ret = bdrv_inactivate_recurse(child->bs, setting_flag);
- if (ret < 0) {
- return ret;
- }
- }
-
if (setting_flag) {
bs->open_flags |= BDRV_O_INACTIVE;
@@ -4049,6 +4052,14 @@ static int bdrv_inactivate_recurse(BlockDriverState *bs,
}
}
}
+
+ QLIST_FOREACH(child, &bs->children, next) {
+ ret = bdrv_inactivate_recurse(child->bs, setting_flag);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
return 0;
}
--
1.8.3.1
- [Qemu-block] [PULL 21/58] file-posix: Add image locking to perm operations, (continued)
- [Qemu-block] [PULL 21/58] file-posix: Add image locking to perm operations, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 25/58] qcow2: Reuse preallocated zero clusters, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 26/58] qcow2: Discard preallocated zero clusters, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 27/58] iotests: Extend test 066, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 28/58] migration: Unify block node activation error handling, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 29/58] block: New BdrvChildRole.activate() for blk_resume_after_migration(), Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 30/58] block: Drop permissions when migration completes, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 33/58] file-posix: Remove .bdrv_inactivate/invalidate_cache, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 32/58] block: Fix write/resize permissions for inactive images, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 36/58] blockdev: use drained_begin/end for qmp_block_resize, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 31/58] block: Inactivate parents before children,
Kevin Wolf <=
- [Qemu-block] [PULL 34/58] qemu-img: wait for convert coroutines to complete, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 35/58] nvme: Implement Write Zeroes, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 38/58] qemu-io: Switch 'alloc' command to byte-based length, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 40/58] blkdebug: Sanity check block layer guarantees, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 39/58] qemu-io: Switch 'map' output to byte-based reporting, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 37/58] qemu-io: Improve alignment checks, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 41/58] blkdebug: Refactor error injection, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 42/58] blkdebug: Add pass-through write_zero and discard support, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 44/58] blkdebug: Add ability to override unmap geometries, Kevin Wolf, 2017/05/11
- [Qemu-block] [PULL 43/58] blkdebug: Simplify override logic, Kevin Wolf, 2017/05/11