[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PULL 19/25] block: Introduce bdrv_co_change_backing_file()
|
From: |
Kevin Wolf |
|
Subject: |
[PULL 19/25] block: Introduce bdrv_co_change_backing_file() |
|
Date: |
Tue, 7 Nov 2023 19:45:59 +0100 |
bdrv_change_backing_file() is called both inside and outside coroutine
context. This makes it difficult for it to take the graph lock
internally. It also means that driver implementations need to be able to
run outside of coroutines, too. Switch it to the usual model with a
coroutine based implementation and a co_wrapper instead. The new
function is marked GRAPH_RDLOCK.
As the co_wrapper now runs the function in the AioContext of the node
(as it should always have done), this is not GLOBAL_STATE_CODE() any
more.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-20-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
include/block/block-global-state.h | 3 +-
include/block/block-io.h | 8 ++
include/block/block_int-common.h | 5 +-
block.c | 11 +--
block/qcow2.c | 128 +++++++++++++++--------------
block/qed.c | 64 +++++++--------
tests/unit/test-bdrv-drain.c | 8 +-
7 files changed, 120 insertions(+), 107 deletions(-)
diff --git a/include/block/block-global-state.h
b/include/block/block-global-state.h
index 9e0ccc1c32..6b21fbc73f 100644
--- a/include/block/block-global-state.h
+++ b/include/block/block-global-state.h
@@ -142,8 +142,7 @@ bdrv_refresh_limits(BlockDriverState *bs, Transaction
*tran, Error **errp);
int bdrv_commit(BlockDriverState *bs);
int GRAPH_RDLOCK bdrv_make_empty(BdrvChild *c, Error **errp);
-int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file,
- const char *backing_fmt, bool warn);
+
void bdrv_register(BlockDriver *bdrv);
int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
const char *backing_file_str);
diff --git a/include/block/block-io.h b/include/block/block-io.h
index 58c4cf50a0..f8729ccc55 100644
--- a/include/block/block-io.h
+++ b/include/block/block-io.h
@@ -210,6 +210,14 @@ void bdrv_round_to_subclusters(BlockDriverState *bs,
void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size);
+int coroutine_fn GRAPH_RDLOCK
+bdrv_co_change_backing_file(BlockDriverState *bs, const char *backing_file,
+ const char *backing_fmt, bool warn);
+
+int co_wrapper_bdrv_rdlock
+bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file,
+ const char *backing_fmt, bool warn);
+
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size);
diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h
index ed6066929a..59f6d7f195 100644
--- a/include/block/block_int-common.h
+++ b/include/block/block_int-common.h
@@ -331,8 +331,9 @@ struct BlockDriver {
const char *name,
Error **errp);
- int (*bdrv_change_backing_file)(BlockDriverState *bs,
- const char *backing_file, const char *backing_fmt);
+ int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_change_backing_file)(
+ BlockDriverState *bs, const char *backing_file,
+ const char *backing_fmt);
/* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event,
diff --git a/block.c b/block.c
index ed0afdffbd..4910b95d7d 100644
--- a/block.c
+++ b/block.c
@@ -5764,13 +5764,14 @@ int coroutine_fn bdrv_co_check(BlockDriverState *bs,
* image file header
* -ENOTSUP - format driver doesn't support changing the backing file
*/
-int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file,
- const char *backing_fmt, bool require)
+int coroutine_fn
+bdrv_co_change_backing_file(BlockDriverState *bs, const char *backing_file,
+ const char *backing_fmt, bool require)
{
BlockDriver *drv = bs->drv;
int ret;
- GLOBAL_STATE_CODE();
+ IO_CODE();
if (!drv) {
return -ENOMEDIUM;
@@ -5785,8 +5786,8 @@ int bdrv_change_backing_file(BlockDriverState *bs, const
char *backing_file,
return -EINVAL;
}
- if (drv->bdrv_change_backing_file != NULL) {
- ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
+ if (drv->bdrv_co_change_backing_file != NULL) {
+ ret = drv->bdrv_co_change_backing_file(bs, backing_file, backing_fmt);
} else {
ret = -ENOTSUP;
}
diff --git a/block/qcow2.c b/block/qcow2.c
index a1443a31aa..875e613ea9 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3155,8 +3155,9 @@ fail:
return ret;
}
-static int qcow2_change_backing_file(BlockDriverState *bs,
- const char *backing_file, const char *backing_fmt)
+static int coroutine_fn GRAPH_RDLOCK
+qcow2_co_change_backing_file(BlockDriverState *bs, const char *backing_file,
+ const char *backing_fmt)
{
BDRVQcow2State *s = bs->opaque;
@@ -3816,8 +3817,11 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
backing_format = BlockdevDriver_str(qcow2_opts->backing_fmt);
}
- ret = bdrv_change_backing_file(blk_bs(blk), qcow2_opts->backing_file,
- backing_format, false);
+ bdrv_graph_co_rdlock();
+ ret = bdrv_co_change_backing_file(blk_bs(blk),
qcow2_opts->backing_file,
+ backing_format, false);
+ bdrv_graph_co_rdunlock();
+
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not assign backing file '%s' "
"with format '%s'", qcow2_opts->backing_file,
@@ -6115,64 +6119,64 @@ static const char *const qcow2_strong_runtime_opts[] = {
};
BlockDriver bdrv_qcow2 = {
- .format_name = "qcow2",
- .instance_size = sizeof(BDRVQcow2State),
- .bdrv_probe = qcow2_probe,
- .bdrv_open = qcow2_open,
- .bdrv_close = qcow2_close,
- .bdrv_reopen_prepare = qcow2_reopen_prepare,
- .bdrv_reopen_commit = qcow2_reopen_commit,
- .bdrv_reopen_commit_post = qcow2_reopen_commit_post,
- .bdrv_reopen_abort = qcow2_reopen_abort,
- .bdrv_join_options = qcow2_join_options,
- .bdrv_child_perm = bdrv_default_perms,
- .bdrv_co_create_opts = qcow2_co_create_opts,
- .bdrv_co_create = qcow2_co_create,
- .bdrv_has_zero_init = qcow2_has_zero_init,
- .bdrv_co_block_status = qcow2_co_block_status,
-
- .bdrv_co_preadv_part = qcow2_co_preadv_part,
- .bdrv_co_pwritev_part = qcow2_co_pwritev_part,
- .bdrv_co_flush_to_os = qcow2_co_flush_to_os,
-
- .bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes,
- .bdrv_co_pdiscard = qcow2_co_pdiscard,
- .bdrv_co_copy_range_from = qcow2_co_copy_range_from,
- .bdrv_co_copy_range_to = qcow2_co_copy_range_to,
- .bdrv_co_truncate = qcow2_co_truncate,
- .bdrv_co_pwritev_compressed_part = qcow2_co_pwritev_compressed_part,
- .bdrv_make_empty = qcow2_make_empty,
-
- .bdrv_snapshot_create = qcow2_snapshot_create,
- .bdrv_snapshot_goto = qcow2_snapshot_goto,
- .bdrv_snapshot_delete = qcow2_snapshot_delete,
- .bdrv_snapshot_list = qcow2_snapshot_list,
- .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp,
- .bdrv_measure = qcow2_measure,
- .bdrv_co_get_info = qcow2_co_get_info,
- .bdrv_get_specific_info = qcow2_get_specific_info,
-
- .bdrv_co_save_vmstate = qcow2_co_save_vmstate,
- .bdrv_co_load_vmstate = qcow2_co_load_vmstate,
-
- .is_format = true,
- .supports_backing = true,
- .bdrv_change_backing_file = qcow2_change_backing_file,
-
- .bdrv_refresh_limits = qcow2_refresh_limits,
- .bdrv_co_invalidate_cache = qcow2_co_invalidate_cache,
- .bdrv_inactivate = qcow2_inactivate,
-
- .create_opts = &qcow2_create_opts,
- .amend_opts = &qcow2_amend_opts,
- .strong_runtime_opts = qcow2_strong_runtime_opts,
- .mutable_opts = mutable_opts,
- .bdrv_co_check = qcow2_co_check,
- .bdrv_amend_options = qcow2_amend_options,
- .bdrv_co_amend = qcow2_co_amend,
-
- .bdrv_detach_aio_context = qcow2_detach_aio_context,
- .bdrv_attach_aio_context = qcow2_attach_aio_context,
+ .format_name = "qcow2",
+ .instance_size = sizeof(BDRVQcow2State),
+ .bdrv_probe = qcow2_probe,
+ .bdrv_open = qcow2_open,
+ .bdrv_close = qcow2_close,
+ .bdrv_reopen_prepare = qcow2_reopen_prepare,
+ .bdrv_reopen_commit = qcow2_reopen_commit,
+ .bdrv_reopen_commit_post = qcow2_reopen_commit_post,
+ .bdrv_reopen_abort = qcow2_reopen_abort,
+ .bdrv_join_options = qcow2_join_options,
+ .bdrv_child_perm = bdrv_default_perms,
+ .bdrv_co_create_opts = qcow2_co_create_opts,
+ .bdrv_co_create = qcow2_co_create,
+ .bdrv_has_zero_init = qcow2_has_zero_init,
+ .bdrv_co_block_status = qcow2_co_block_status,
+
+ .bdrv_co_preadv_part = qcow2_co_preadv_part,
+ .bdrv_co_pwritev_part = qcow2_co_pwritev_part,
+ .bdrv_co_flush_to_os = qcow2_co_flush_to_os,
+
+ .bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes,
+ .bdrv_co_pdiscard = qcow2_co_pdiscard,
+ .bdrv_co_copy_range_from = qcow2_co_copy_range_from,
+ .bdrv_co_copy_range_to = qcow2_co_copy_range_to,
+ .bdrv_co_truncate = qcow2_co_truncate,
+ .bdrv_co_pwritev_compressed_part = qcow2_co_pwritev_compressed_part,
+ .bdrv_make_empty = qcow2_make_empty,
+
+ .bdrv_snapshot_create = qcow2_snapshot_create,
+ .bdrv_snapshot_goto = qcow2_snapshot_goto,
+ .bdrv_snapshot_delete = qcow2_snapshot_delete,
+ .bdrv_snapshot_list = qcow2_snapshot_list,
+ .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp,
+ .bdrv_measure = qcow2_measure,
+ .bdrv_co_get_info = qcow2_co_get_info,
+ .bdrv_get_specific_info = qcow2_get_specific_info,
+
+ .bdrv_co_save_vmstate = qcow2_co_save_vmstate,
+ .bdrv_co_load_vmstate = qcow2_co_load_vmstate,
+
+ .is_format = true,
+ .supports_backing = true,
+ .bdrv_co_change_backing_file = qcow2_co_change_backing_file,
+
+ .bdrv_refresh_limits = qcow2_refresh_limits,
+ .bdrv_co_invalidate_cache = qcow2_co_invalidate_cache,
+ .bdrv_inactivate = qcow2_inactivate,
+
+ .create_opts = &qcow2_create_opts,
+ .amend_opts = &qcow2_amend_opts,
+ .strong_runtime_opts = qcow2_strong_runtime_opts,
+ .mutable_opts = mutable_opts,
+ .bdrv_co_check = qcow2_co_check,
+ .bdrv_amend_options = qcow2_amend_options,
+ .bdrv_co_amend = qcow2_co_amend,
+
+ .bdrv_detach_aio_context = qcow2_detach_aio_context,
+ .bdrv_attach_aio_context = qcow2_attach_aio_context,
.bdrv_supports_persistent_dirty_bitmap =
qcow2_supports_persistent_dirty_bitmap,
diff --git a/block/qed.c b/block/qed.c
index 686ad711f7..996aa384fe 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1498,9 +1498,9 @@ bdrv_qed_co_get_info(BlockDriverState *bs,
BlockDriverInfo *bdi)
return 0;
}
-static int bdrv_qed_change_backing_file(BlockDriverState *bs,
- const char *backing_file,
- const char *backing_fmt)
+static int coroutine_fn GRAPH_RDLOCK
+bdrv_qed_co_change_backing_file(BlockDriverState *bs, const char *backing_file,
+ const char *backing_fmt)
{
BDRVQEDState *s = bs->opaque;
QEDHeader new_header, le_header;
@@ -1562,7 +1562,7 @@ static int bdrv_qed_change_backing_file(BlockDriverState
*bs,
}
/* Write new header */
- ret = bdrv_pwrite_sync(bs->file, 0, buffer_len, buffer, 0);
+ ret = bdrv_co_pwrite_sync(bs->file, 0, buffer_len, buffer, 0);
g_free(buffer);
if (ret == 0) {
memcpy(&s->header, &new_header, sizeof(new_header));
@@ -1636,34 +1636,34 @@ static QemuOptsList qed_create_opts = {
};
static BlockDriver bdrv_qed = {
- .format_name = "qed",
- .instance_size = sizeof(BDRVQEDState),
- .create_opts = &qed_create_opts,
- .is_format = true,
- .supports_backing = true,
-
- .bdrv_probe = bdrv_qed_probe,
- .bdrv_open = bdrv_qed_open,
- .bdrv_close = bdrv_qed_close,
- .bdrv_reopen_prepare = bdrv_qed_reopen_prepare,
- .bdrv_child_perm = bdrv_default_perms,
- .bdrv_co_create = bdrv_qed_co_create,
- .bdrv_co_create_opts = bdrv_qed_co_create_opts,
- .bdrv_has_zero_init = bdrv_has_zero_init_1,
- .bdrv_co_block_status = bdrv_qed_co_block_status,
- .bdrv_co_readv = bdrv_qed_co_readv,
- .bdrv_co_writev = bdrv_qed_co_writev,
- .bdrv_co_pwrite_zeroes = bdrv_qed_co_pwrite_zeroes,
- .bdrv_co_truncate = bdrv_qed_co_truncate,
- .bdrv_co_getlength = bdrv_qed_co_getlength,
- .bdrv_co_get_info = bdrv_qed_co_get_info,
- .bdrv_refresh_limits = bdrv_qed_refresh_limits,
- .bdrv_change_backing_file = bdrv_qed_change_backing_file,
- .bdrv_co_invalidate_cache = bdrv_qed_co_invalidate_cache,
- .bdrv_co_check = bdrv_qed_co_check,
- .bdrv_detach_aio_context = bdrv_qed_detach_aio_context,
- .bdrv_attach_aio_context = bdrv_qed_attach_aio_context,
- .bdrv_drain_begin = bdrv_qed_drain_begin,
+ .format_name = "qed",
+ .instance_size = sizeof(BDRVQEDState),
+ .create_opts = &qed_create_opts,
+ .is_format = true,
+ .supports_backing = true,
+
+ .bdrv_probe = bdrv_qed_probe,
+ .bdrv_open = bdrv_qed_open,
+ .bdrv_close = bdrv_qed_close,
+ .bdrv_reopen_prepare = bdrv_qed_reopen_prepare,
+ .bdrv_child_perm = bdrv_default_perms,
+ .bdrv_co_create = bdrv_qed_co_create,
+ .bdrv_co_create_opts = bdrv_qed_co_create_opts,
+ .bdrv_has_zero_init = bdrv_has_zero_init_1,
+ .bdrv_co_block_status = bdrv_qed_co_block_status,
+ .bdrv_co_readv = bdrv_qed_co_readv,
+ .bdrv_co_writev = bdrv_qed_co_writev,
+ .bdrv_co_pwrite_zeroes = bdrv_qed_co_pwrite_zeroes,
+ .bdrv_co_truncate = bdrv_qed_co_truncate,
+ .bdrv_co_getlength = bdrv_qed_co_getlength,
+ .bdrv_co_get_info = bdrv_qed_co_get_info,
+ .bdrv_refresh_limits = bdrv_qed_refresh_limits,
+ .bdrv_co_change_backing_file = bdrv_qed_co_change_backing_file,
+ .bdrv_co_invalidate_cache = bdrv_qed_co_invalidate_cache,
+ .bdrv_co_check = bdrv_qed_co_check,
+ .bdrv_detach_aio_context = bdrv_qed_detach_aio_context,
+ .bdrv_attach_aio_context = bdrv_qed_attach_aio_context,
+ .bdrv_drain_begin = bdrv_qed_drain_begin,
};
static void bdrv_qed_init(void)
diff --git a/tests/unit/test-bdrv-drain.c b/tests/unit/test-bdrv-drain.c
index ba4e42b197..8d05538bf6 100644
--- a/tests/unit/test-bdrv-drain.c
+++ b/tests/unit/test-bdrv-drain.c
@@ -96,9 +96,9 @@ static int coroutine_fn bdrv_test_co_preadv(BlockDriverState
*bs,
return 0;
}
-static int bdrv_test_change_backing_file(BlockDriverState *bs,
- const char *backing_file,
- const char *backing_fmt)
+static int bdrv_test_co_change_backing_file(BlockDriverState *bs,
+ const char *backing_file,
+ const char *backing_fmt)
{
return 0;
}
@@ -116,7 +116,7 @@ static BlockDriver bdrv_test = {
.bdrv_child_perm = bdrv_default_perms,
- .bdrv_change_backing_file = bdrv_test_change_backing_file,
+ .bdrv_co_change_backing_file = bdrv_test_co_change_backing_file,
};
static void aio_ret_cb(void *opaque, int ret)
--
2.41.0
- [PULL 17/25] block: Protect bs->backing with graph_lock, (continued)
- [PULL 17/25] block: Protect bs->backing with graph_lock, Kevin Wolf, 2023/11/07
- [PULL 22/25] vhdx: Take locks for accessing bs->file, Kevin Wolf, 2023/11/07
- [PULL 08/25] block: Mark bdrv_skip_filters() and callers GRAPH_RDLOCK, Kevin Wolf, 2023/11/07
- [PULL 14/25] block: Inline bdrv_set_backing_noperm(), Kevin Wolf, 2023/11/07
- [PULL 18/25] blkverify: Add locking for request_fn, Kevin Wolf, 2023/11/07
- [PULL 16/25] block: Mark bdrv_replace_node() GRAPH_WRLOCK, Kevin Wolf, 2023/11/07
- [PULL 15/25] block: Mark bdrv_replace_node_common() GRAPH_WRLOCK, Kevin Wolf, 2023/11/07
- [PULL 21/25] qcow2: Take locks for accessing bs->file, Kevin Wolf, 2023/11/07
- [PULL 20/25] block: Add missing GRAPH_RDLOCK annotations, Kevin Wolf, 2023/11/07
- [PULL 25/25] hw/ide/ahci: trigger either error IRQ or regular IRQ, not both, Kevin Wolf, 2023/11/07
- [PULL 19/25] block: Introduce bdrv_co_change_backing_file(),
Kevin Wolf <=
- Re: [PULL 00/25] Block layer patches, Stefan Hajnoczi, 2023/11/07