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[Qemu-devel] [PATCH 2/6] block: Add reopen_queue to bdrv_child_perm()
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From: |
Kevin Wolf |
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Subject: |
[Qemu-devel] [PATCH 2/6] block: Add reopen_queue to bdrv_child_perm() |
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Date: |
Fri, 15 Sep 2017 12:10:04 +0200 |
In the context of bdrv_reopen(), we'll have to look at the state of the
graph as it will be after the reopen. This interface addition is in
preparation for the change.
Signed-off-by: Kevin Wolf <address@hidden>
---
include/block/block_int.h | 7 +++++++
block.c | 19 ++++++++++++-------
block/commit.c | 1 +
block/mirror.c | 1 +
block/replication.c | 1 +
block/vvfat.c | 1 +
6 files changed, 23 insertions(+), 7 deletions(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index ba4c383393..99abe2ce74 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -411,9 +411,14 @@ struct BlockDriver {
*
* If @c is NULL, return the permissions for attaching a new child for the
* given @role.
+ *
+ * If @reopen_queue is non-NULL, don't return the currently needed
+ * permissions, but those that will be needed after applying the
+ * @reopen_queue.
*/
void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t parent_perm, uint64_t parent_shared,
uint64_t *nperm, uint64_t *nshared);
@@ -983,6 +988,7 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm,
uint64_t shared,
* all children */
void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared);
@@ -992,6 +998,7 @@ void bdrv_filter_default_perms(BlockDriverState *bs,
BdrvChild *c,
* CONSISTENT_READ and doesn't share WRITE. */
void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared);
diff --git a/block.c b/block.c
index 6dd47e414e..c7724c85e3 100644
--- a/block.c
+++ b/block.c
@@ -1537,16 +1537,17 @@ static void bdrv_child_abort_perm_update(BdrvChild *c);
static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared);
static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
- BdrvChild *c,
- const BdrvChildRole *role,
+ BdrvChild *c, const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t parent_perm, uint64_t parent_shared,
uint64_t *nperm, uint64_t *nshared)
{
if (bs->drv && bs->drv->bdrv_child_perm) {
- bs->drv->bdrv_child_perm(bs, c, role,
+ bs->drv->bdrv_child_perm(bs, c, role, reopen_queue,
parent_perm, parent_shared,
nperm, nshared);
}
+ /* TODO Take force_share from reopen_queue */
if (child_bs && child_bs->force_share) {
*nshared = BLK_PERM_ALL;
}
@@ -1596,7 +1597,7 @@ static int bdrv_check_perm(BlockDriverState *bs, uint64_t
cumulative_perms,
/* Check all children */
QLIST_FOREACH(c, &bs->children, next) {
uint64_t cur_perm, cur_shared;
- bdrv_child_perm(bs, c->bs, c, c->role,
+ bdrv_child_perm(bs, c->bs, c, c->role, NULL,
cumulative_perms, cumulative_shared_perms,
&cur_perm, &cur_shared);
ret = bdrv_child_check_perm(c, cur_perm, cur_shared, ignore_children,
@@ -1658,7 +1659,7 @@ static void bdrv_set_perm(BlockDriverState *bs, uint64_t
cumulative_perms,
/* Update all children */
QLIST_FOREACH(c, &bs->children, next) {
uint64_t cur_perm, cur_shared;
- bdrv_child_perm(bs, c->bs, c, c->role,
+ bdrv_child_perm(bs, c->bs, c, c->role, NULL,
cumulative_perms, cumulative_shared_perms,
&cur_perm, &cur_shared);
bdrv_child_set_perm(c, cur_perm, cur_shared);
@@ -1827,6 +1828,7 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm,
uint64_t shared,
void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
@@ -1844,6 +1846,7 @@ void bdrv_filter_default_perms(BlockDriverState *bs,
BdrvChild *c,
void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
@@ -1853,9 +1856,11 @@ void bdrv_format_default_perms(BlockDriverState *bs,
BdrvChild *c,
if (!backing) {
/* Apart from the modifications below, the same permissions are
* forwarded and left alone as for filters */
- bdrv_filter_default_perms(bs, c, role, perm, shared, &perm, &shared);
+ bdrv_filter_default_perms(bs, c, role, reopen_queue, perm, shared,
+ &perm, &shared);
/* Format drivers may touch metadata even if the guest doesn't write */
+ /* TODO Take flags from reopen_queue */
if (bdrv_is_writable(bs)) {
perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE;
}
@@ -1999,7 +2004,7 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
assert(parent_bs->drv);
assert(bdrv_get_aio_context(parent_bs) == bdrv_get_aio_context(child_bs));
- bdrv_child_perm(parent_bs, child_bs, NULL, child_role,
+ bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL,
perm, shared_perm, &perm, &shared_perm);
child = bdrv_root_attach_child(child_bs, child_name, child_role,
diff --git a/block/commit.c b/block/commit.c
index 898d91f653..8f0e83578a 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -257,6 +257,7 @@ static void bdrv_commit_top_close(BlockDriverState *bs)
static void bdrv_commit_top_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
diff --git a/block/mirror.c b/block/mirror.c
index 6531652d73..6f5cb9f26c 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1084,6 +1084,7 @@ static void bdrv_mirror_top_close(BlockDriverState *bs)
static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
diff --git a/block/replication.c b/block/replication.c
index bf4462c8e7..3a4e6822e4 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -157,6 +157,7 @@ static void replication_close(BlockDriverState *bs)
static void replication_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
diff --git a/block/vvfat.c b/block/vvfat.c
index c54fa94651..ee894bbe98 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -3210,6 +3210,7 @@ err:
static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
+ BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared)
{
--
2.13.5
- [Qemu-devel] [PATCH 0/6] block: Fix permissions after ro/rw reopen, Kevin Wolf, 2017/09/15
- [Qemu-devel] [PATCH 1/6] qemu-io: Reset qemuio_blk permissions before each command, Kevin Wolf, 2017/09/15
- [Qemu-devel] [PATCH 3/6] block: Add reopen queue to bdrv_check_perm(), Kevin Wolf, 2017/09/15
- [Qemu-devel] [PATCH 4/6] block: Base permissions on rw state after reopen, Kevin Wolf, 2017/09/15
- [Qemu-devel] [PATCH 2/6] block: Add reopen_queue to bdrv_child_perm(),
Kevin Wolf <=
- [Qemu-devel] [PATCH 6/6] block: Fix permissions after bdrv_reopen(), Kevin Wolf, 2017/09/15
- [Qemu-devel] [PATCH 5/6] block: reopen: Queue children after their parents, Kevin Wolf, 2017/09/15
- [Qemu-devel] [PATCH 7/6] qemu-iotests: Test change-backing-file command, Kevin Wolf, 2017/09/15