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block: remove AioContext locking

Browse Source 
This is the big patch that removes
aio_context_acquire()/aio_context_release() from the block layer and
affected block layer users.

There isn't a clean way to split this patch and the reviewers are likely
the same group of people, so I decided to do it in one patch.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Message-ID: <20231205182011.1976568-7-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-12-05 13:20:03 -05:00 committed by Kevin Wolf
parent 6bc30f1949
commit b49f4755c7
41 changed files with 104 additions and 1169 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

234
block.c
View File

@ -1625,7 +1625,6 @@ static int no_coroutine_fn GRAPH_UNLOCKED
bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name,
QDict *options, int open_flags, Error **errp)
{
AioContext *ctx;
Error *local_err = NULL;
int i, ret;
GLOBAL_STATE_CODE();
@ -1673,21 +1672,15 @@ bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name,
bs->supported_read_flags |= BDRV_REQ_REGISTERED_BUF;
bs->supported_write_flags |= BDRV_REQ_REGISTERED_BUF;
/* Get the context after .bdrv_open, it can change the context */
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
ret = bdrv_refresh_total_sectors(bs, bs->total_sectors);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not refresh total sector count");
aio_context_release(ctx);
return ret;
}
bdrv_graph_rdlock_main_loop();
bdrv_refresh_limits(bs, NULL, &local_err);
bdrv_graph_rdunlock_main_loop();
aio_context_release(ctx);
if (local_err) {
error_propagate(errp, local_err);
@ -3062,7 +3055,7 @@ bdrv_attach_child_common(BlockDriverState *child_bs,
Transaction *tran, Error **errp)
{
BdrvChild *new_child;
AioContext *parent_ctx, *new_child_ctx;
AioContext *parent_ctx;
AioContext *child_ctx = bdrv_get_aio_context(child_bs);
assert(child_class->get_parent_desc);
@ -3114,12 +3107,6 @@ bdrv_attach_child_common(BlockDriverState *child_bs,
}
}
new_child_ctx = bdrv_get_aio_context(child_bs);
if (new_child_ctx != child_ctx) {
aio_context_release(child_ctx);
aio_context_acquire(new_child_ctx);
}
bdrv_ref(child_bs);
/*
* Let every new BdrvChild start with a drained parent. Inserting the child
@ -3149,11 +3136,6 @@ bdrv_attach_child_common(BlockDriverState *child_bs,
};
tran_add(tran, &bdrv_attach_child_common_drv, s);
if (new_child_ctx != child_ctx) {
aio_context_release(new_child_ctx);
aio_context_acquire(child_ctx);
}
return new_child;
}
@ -3605,7 +3587,6 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
int ret = 0;
bool implicit_backing = false;
BlockDriverState *backing_hd;
AioContext *backing_hd_ctx;
QDict *options;
QDict *tmp_parent_options = NULL;
Error *local_err = NULL;
@ -3691,11 +3672,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
/* Hook up the backing file link; drop our reference, bs owns the
* backing_hd reference now */
backing_hd_ctx = bdrv_get_aio_context(backing_hd);
aio_context_acquire(backing_hd_ctx);
ret = bdrv_set_backing_hd(bs, backing_hd, errp);
bdrv_unref(backing_hd);
aio_context_release(backing_hd_ctx);
if (ret < 0) {
goto free_exit;
@ -3780,7 +3758,6 @@ BdrvChild *bdrv_open_child(const char *filename,
{
BlockDriverState *bs;
BdrvChild *child;
AioContext *ctx;
GLOBAL_STATE_CODE();
@ -3791,11 +3768,8 @@ BdrvChild *bdrv_open_child(const char *filename,
}
bdrv_graph_wrlock();
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
child = bdrv_attach_child(parent, bs, bdref_key, child_class, child_role,
errp);
aio_context_release(ctx);
bdrv_graph_wrunlock();
return child;
@ -3881,7 +3855,6 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
int64_t total_size;
QemuOpts *opts = NULL;
BlockDriverState *bs_snapshot = NULL;
AioContext *ctx = bdrv_get_aio_context(bs);
int ret;
GLOBAL_STATE_CODE();
@ -3890,9 +3863,7 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
instead of opening 'filename' directly */
/* Get the required size from the image */
aio_context_acquire(ctx);
total_size = bdrv_getlength(bs);
aio_context_release(ctx);
if (total_size < 0) {
error_setg_errno(errp, -total_size, "Could not get image size");
@ -3927,10 +3898,7 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
goto out;
}
aio_context_acquire(ctx);
ret = bdrv_append(bs_snapshot, bs, errp);
aio_context_release(ctx);
if (ret < 0) {
bs_snapshot = NULL;
goto out;
@ -3974,7 +3942,6 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
Error *local_err = NULL;
QDict *snapshot_options = NULL;
int snapshot_flags = 0;
AioContext *ctx = qemu_get_aio_context();
assert(!child_class || !flags);
assert(!child_class == !parent);
@ -4115,12 +4082,10 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
/* Not requesting BLK_PERM_CONSISTENT_READ because we're only
* looking at the header to guess the image format. This works even
* in cases where a guest would not see a consistent state. */
ctx = bdrv_get_aio_context(file_bs);
aio_context_acquire(ctx);
AioContext *ctx = bdrv_get_aio_context(file_bs);
file = blk_new(ctx, 0, BLK_PERM_ALL);
blk_insert_bs(file, file_bs, &local_err);
bdrv_unref(file_bs);
aio_context_release(ctx);
if (local_err) {
goto fail;
@ -4167,13 +4132,8 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
goto fail;
}
/* The AioContext could have changed during bdrv_open_common() */
ctx = bdrv_get_aio_context(bs);
if (file) {
aio_context_acquire(ctx);
blk_unref(file);
aio_context_release(ctx);
file = NULL;
}
@ -4231,16 +4191,13 @@ bdrv_open_inherit(const char *filename, const char *reference, QDict *options,
* (snapshot_bs); thus, we have to drop the strong reference to bs
* (which we obtained by calling bdrv_new()). bs will not be deleted,
* though, because the overlay still has a reference to it. */
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
bs = snapshot_bs;
}
return bs;
fail:
aio_context_acquire(ctx);
blk_unref(file);
qobject_unref(snapshot_options);
qobject_unref(bs->explicit_options);
@ -4249,14 +4206,11 @@ fail:
bs->options = NULL;
bs->explicit_options = NULL;
bdrv_unref(bs);
aio_context_release(ctx);
error_propagate(errp, local_err);
return NULL;
close_and_fail:
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
qobject_unref(snapshot_options);
qobject_unref(options);
error_propagate(errp, local_err);
@ -4540,12 +4494,7 @@ void bdrv_reopen_queue_free(BlockReopenQueue *bs_queue)
if (bs_queue) {
BlockReopenQueueEntry *bs_entry, *next;
QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) {
AioContext *ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
bdrv_drained_end(bs_entry->state.bs);
aio_context_release(ctx);
qobject_unref(bs_entry->state.explicit_options);
qobject_unref(bs_entry->state.options);
g_free(bs_entry);
@ -4577,7 +4526,6 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
{
int ret = -1;
BlockReopenQueueEntry *bs_entry, *next;
AioContext *ctx;
Transaction *tran = tran_new();
g_autoptr(GSList) refresh_list = NULL;
@ -4586,10 +4534,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
GLOBAL_STATE_CODE();
QTAILQ_FOREACH(bs_entry, bs_queue, entry) {
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
ret = bdrv_flush(bs_entry->state.bs);
aio_context_release(ctx);
if (ret < 0) {
error_setg_errno(errp, -ret, "Error flushing drive");
goto abort;
@ -4598,10 +4543,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
QTAILQ_FOREACH(bs_entry, bs_queue, entry) {
assert(bs_entry->state.bs->quiesce_counter > 0);
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
ret = bdrv_reopen_prepare(&bs_entry->state, bs_queue, tran, errp);
aio_context_release(ctx);
if (ret < 0) {
goto abort;
}
@ -4644,10 +4586,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
* to first element.
*/
QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) {
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
bdrv_reopen_commit(&bs_entry->state);
aio_context_release(ctx);
}
bdrv_graph_wrlock();
@ -4658,10 +4597,7 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
BlockDriverState *bs = bs_entry->state.bs;
if (bs->drv->bdrv_reopen_commit_post) {
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bs->drv->bdrv_reopen_commit_post(&bs_entry->state);
aio_context_release(ctx);
}
}
@ -4675,10 +4611,7 @@ abort:
QTAILQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) {
if (bs_entry->prepared) {
ctx = bdrv_get_aio_context(bs_entry->state.bs);
aio_context_acquire(ctx);
bdrv_reopen_abort(&bs_entry->state);
aio_context_release(ctx);
}
}
@ -4691,24 +4624,13 @@ cleanup:
int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts,
Error **errp)
{
AioContext *ctx = bdrv_get_aio_context(bs);
BlockReopenQueue *queue;
int ret;
GLOBAL_STATE_CODE();
queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts);
if (ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
}
ret = bdrv_reopen_multiple(queue, errp);
if (ctx != qemu_get_aio_context()) {
aio_context_acquire(ctx);
}
return ret;
return bdrv_reopen_multiple(queue, errp);
}
int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
@ -4760,7 +4682,6 @@ bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state,
const char *child_name = is_backing ? "backing" : "file";
QObject *value;
const char *str;
AioContext *ctx, *old_ctx;
bool has_child;
int ret;
@ -4844,13 +4765,6 @@ bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state,
bdrv_drained_begin(old_child_bs);
}
old_ctx = bdrv_get_aio_context(bs);
ctx = bdrv_get_aio_context(new_child_bs);
if (old_ctx != ctx) {
aio_context_release(old_ctx);
aio_context_acquire(ctx);
}
bdrv_graph_rdunlock_main_loop();
bdrv_graph_wrlock();
@ -4859,11 +4773,6 @@ bdrv_reopen_parse_file_or_backing(BDRVReopenState *reopen_state,
bdrv_graph_wrunlock();
if (old_ctx != ctx) {
aio_context_release(ctx);
aio_context_acquire(old_ctx);
}
if (old_child_bs) {
bdrv_drained_end(old_child_bs);
bdrv_unref(old_child_bs);
@ -5537,7 +5446,6 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
int ret;
BdrvChild *child;
Transaction *tran = tran_new();
AioContext *old_context, *new_context = NULL;
GLOBAL_STATE_CODE();
@ -5545,21 +5453,8 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
assert(!bs_new->backing);
bdrv_graph_rdunlock_main_loop();
old_context = bdrv_get_aio_context(bs_top);
bdrv_drained_begin(bs_top);
/*
* bdrv_drained_begin() requires that only the AioContext of the drained
* node is locked, and at this point it can still differ from the AioContext
* of bs_top.
*/
new_context = bdrv_get_aio_context(bs_new);
aio_context_release(old_context);
aio_context_acquire(new_context);
bdrv_drained_begin(bs_new);
aio_context_release(new_context);
aio_context_acquire(old_context);
new_context = NULL;
bdrv_graph_wrlock();
@ -5571,18 +5466,6 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
goto out;
}
/*
* bdrv_attach_child_noperm could change the AioContext of bs_top and
* bs_new, but at least they are in the same AioContext now. This is the
* AioContext that we need to lock for the rest of the function.
*/
new_context = bdrv_get_aio_context(bs_top);
if (old_context != new_context) {
aio_context_release(old_context);
aio_context_acquire(new_context);
}
ret = bdrv_replace_node_noperm(bs_top, bs_new, true, tran, errp);
if (ret < 0) {
goto out;
@ -5598,11 +5481,6 @@ out:
bdrv_drained_end(bs_top);
bdrv_drained_end(bs_new);
if (new_context && old_context != new_context) {
aio_context_release(new_context);
aio_context_acquire(old_context);
}
return ret;
}
@ -5697,12 +5575,8 @@ BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *options,
GLOBAL_STATE_CODE();
aio_context_release(ctx);
aio_context_acquire(qemu_get_aio_context());
new_node_bs = bdrv_new_open_driver_opts(drv, node_name, options, flags,
errp);
aio_context_release(qemu_get_aio_context());
aio_context_acquire(ctx);
assert(bdrv_get_aio_context(bs) == ctx);
options = NULL; /* bdrv_new_open_driver() eats options */
@ -7037,12 +6911,9 @@ void bdrv_activate_all(Error **errp)
GRAPH_RDLOCK_GUARD_MAINLOOP();
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
int ret;
aio_context_acquire(aio_context);
ret = bdrv_activate(bs, errp);
aio_context_release(aio_context);
if (ret < 0) {
bdrv_next_cleanup(&it);
return;
@ -7137,20 +7008,10 @@ int bdrv_inactivate_all(void)
BlockDriverState *bs = NULL;
BdrvNextIterator it;
int ret = 0;
GSList *aio_ctxs = NULL, *ctx;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
if (!g_slist_find(aio_ctxs, aio_context)) {
aio_ctxs = g_slist_prepend(aio_ctxs, aio_context);
aio_context_acquire(aio_context);
}
}
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
/* Nodes with BDS parents are covered by recursion from the last
* parent that gets inactivated. Don't inactivate them a second
@ -7161,17 +7022,10 @@ int bdrv_inactivate_all(void)
ret = bdrv_inactivate_recurse(bs);
if (ret < 0) {
bdrv_next_cleanup(&it);
goto out;
break;
}
}
out:
for (ctx = aio_ctxs; ctx != NULL; ctx = ctx->next) {
AioContext *aio_context = ctx->data;
aio_context_release(aio_context);
}
g_slist_free(aio_ctxs);
return ret;
}
@ -7257,11 +7111,8 @@ void bdrv_unref(BlockDriverState *bs)
static void bdrv_schedule_unref_bh(void *opaque)
{
BlockDriverState *bs = opaque;
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_unref(bs);
aio_context_release(ctx);
}
/*
@ -7398,8 +7249,6 @@ void bdrv_img_create(const char *filename, const char *fmt,
return;
}
aio_context_acquire(qemu_get_aio_context());
/* Create parameter list */
create_opts = qemu_opts_append(create_opts, drv->create_opts);
create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
@ -7549,7 +7398,6 @@ out:
qemu_opts_del(opts);
qemu_opts_free(create_opts);
error_propagate(errp, local_err);
aio_context_release(qemu_get_aio_context());
}
AioContext *bdrv_get_aio_context(BlockDriverState *bs)
@ -7585,29 +7433,12 @@ void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx)
void coroutine_fn bdrv_co_lock(BlockDriverState *bs)
{
AioContext *ctx = bdrv_get_aio_context(bs);
/* In the main thread, bs->aio_context won't change concurrently */
assert(qemu_get_current_aio_context() == qemu_get_aio_context());
/*
* We're in coroutine context, so we already hold the lock of the main
* loop AioContext. Don't lock it twice to avoid deadlocks.
*/
assert(qemu_in_coroutine());
if (ctx != qemu_get_aio_context()) {
aio_context_acquire(ctx);
}
/* TODO removed in next patch */
}
void coroutine_fn bdrv_co_unlock(BlockDriverState *bs)
{
AioContext *ctx = bdrv_get_aio_context(bs);
assert(qemu_in_coroutine());
if (ctx != qemu_get_aio_context()) {
aio_context_release(ctx);
}
/* TODO removed in next patch */
}
static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban)
@ -7728,21 +7559,8 @@ static void bdrv_set_aio_context_commit(void *opaque)
BdrvStateSetAioContext *state = (BdrvStateSetAioContext *) opaque;
BlockDriverState *bs = (BlockDriverState *) state->bs;
AioContext *new_context = state->new_ctx;
AioContext *old_context = bdrv_get_aio_context(bs);
/*
* Take the old AioContex when detaching it from bs.
* At this point, new_context lock is already acquired, and we are now
* also taking old_context. This is safe as long as bdrv_detach_aio_context
* does not call AIO_POLL_WHILE().
*/
if (old_context != qemu_get_aio_context()) {
aio_context_acquire(old_context);
}
bdrv_detach_aio_context(bs);
if (old_context != qemu_get_aio_context()) {
aio_context_release(old_context);
}
bdrv_attach_aio_context(bs, new_context);
}
@ -7827,7 +7645,6 @@ int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
Transaction *tran;
GHashTable *visited;
int ret;
AioContext *old_context = bdrv_get_aio_context(bs);
GLOBAL_STATE_CODE();
/*
@ -7857,34 +7674,7 @@ int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
return -EPERM;
}
/*
* Release old AioContext, it won't be needed anymore, as all
* bdrv_drained_begin() have been called already.
*/
if (qemu_get_aio_context() != old_context) {
aio_context_release(old_context);
}
/*
* Acquire new AioContext since bdrv_drained_end() is going to be called
* after we switched all nodes in the new AioContext, and the function
* assumes that the lock of the bs is always taken.
*/
if (qemu_get_aio_context() != ctx) {
aio_context_acquire(ctx);
}
tran_commit(tran);
if (qemu_get_aio_context() != ctx) {
aio_context_release(ctx);
}
/* Re-acquire the old AioContext, since the caller takes and releases it. */
if (qemu_get_aio_context() != old_context) {
aio_context_acquire(old_context);
}
return 0;
}
@ -8006,7 +7796,6 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
const char *node_name, Error **errp)
{
BlockDriverState *to_replace_bs = bdrv_find_node(node_name);
AioContext *aio_context;
GLOBAL_STATE_CODE();
@ -8015,12 +7804,8 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
return NULL;
}
aio_context = bdrv_get_aio_context(to_replace_bs);
aio_context_acquire(aio_context);
if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) {
to_replace_bs = NULL;
goto out;
return NULL;
}
/* We don't want arbitrary node of the BDS chain to be replaced only the top
@ -8033,12 +7818,9 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
"because it cannot be guaranteed that doing so would not "
"lead to an abrupt change of visible data",
node_name, parent_bs->node_name);
to_replace_bs = NULL;
goto out;
return NULL;
}
out:
aio_context_release(aio_context);
return to_replace_bs;
}

14
block/block-backend.c
View File

@ -429,7 +429,6 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
{
BlockBackend *blk;
BlockDriverState *bs;
AioContext *ctx;
uint64_t perm = 0;
uint64_t shared = BLK_PERM_ALL;
@ -459,23 +458,18 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
shared = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED;
}
aio_context_acquire(qemu_get_aio_context());
bs = bdrv_open(filename, reference, options, flags, errp);
aio_context_release(qemu_get_aio_context());
if (!bs) {
return NULL;
}
/* bdrv_open() could have moved bs to a different AioContext */
ctx = bdrv_get_aio_context(bs);
blk = blk_new(bdrv_get_aio_context(bs), perm, shared);
blk->perm = perm;
blk->shared_perm = shared;
aio_context_acquire(ctx);
blk_insert_bs(blk, bs, errp);
bdrv_unref(bs);
aio_context_release(ctx);
if (!blk->root) {
blk_unref(blk);
@ -577,13 +571,9 @@ void blk_remove_all_bs(void)
GLOBAL_STATE_CODE();
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
if (blk->root) {
blk_remove_bs(blk);
}
aio_context_release(ctx);
}
}
@ -2736,20 +2726,16 @@ int blk_commit_all(void)
GRAPH_RDLOCK_GUARD_MAINLOOP();
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *aio_context = blk_get_aio_context(blk);
BlockDriverState *unfiltered_bs = bdrv_skip_filters(blk_bs(blk));
aio_context_acquire(aio_context);
if (blk_is_inserted(blk) && bdrv_cow_child(unfiltered_bs)) {
int ret;
ret = bdrv_commit(unfiltered_bs);
if (ret < 0) {
aio_context_release(aio_context);
return ret;
}
}
aio_context_release(aio_context);
}
return 0;
}

22
block/copy-before-write.c
View File

@ -412,7 +412,6 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
int64_t cluster_size;
g_autoptr(BlockdevOptions) full_opts = NULL;
BlockdevOptionsCbw *opts;
AioContext *ctx;
int ret;
full_opts = cbw_parse_options(options, errp);
@ -435,15 +434,11 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
GRAPH_RDLOCK_GUARD_MAINLOOP();
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (opts->bitmap) {
bitmap = block_dirty_bitmap_lookup(opts->bitmap->node,
opts->bitmap->name, NULL, errp);
if (!bitmap) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
}
s->on_cbw_error = opts->has_on_cbw_error ? opts->on_cbw_error :
@ -461,24 +456,21 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
s->bcs = block_copy_state_new(bs->file, s->target, bitmap, errp);
if (!s->bcs) {
error_prepend(errp, "Cannot create block-copy-state: ");
ret = -EINVAL;
goto out;
return -EINVAL;
}
cluster_size = block_copy_cluster_size(s->bcs);
s->done_bitmap = bdrv_create_dirty_bitmap(bs, cluster_size, NULL, errp);
if (!s->done_bitmap) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
bdrv_disable_dirty_bitmap(s->done_bitmap);
/* s->access_bitmap starts equal to bcs bitmap */
s->access_bitmap = bdrv_create_dirty_bitmap(bs, cluster_size, NULL, errp);
if (!s->access_bitmap) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
bdrv_disable_dirty_bitmap(s->access_bitmap);
bdrv_dirty_bitmap_merge_internal(s->access_bitmap,
@ -487,11 +479,7 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
qemu_co_mutex_init(&s->lock);
QLIST_INIT(&s->frozen_read_reqs);
ret = 0;
out:
aio_context_release(ctx);
return ret;
return 0;
}
static void cbw_close(BlockDriverState *bs)

22
block/export/export.c
View File

@ -114,7 +114,6 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp)
}
ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (export->iothread) {
IOThread *iothread;
@ -133,8 +132,6 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp)
set_context_errp = fixed_iothread ? errp : NULL;
ret = bdrv_try_change_aio_context(bs, new_ctx, NULL, set_context_errp);
if (ret == 0) {
aio_context_release(ctx);
aio_context_acquire(new_ctx);
ctx = new_ctx;
} else if (fixed_iothread) {
goto fail;
@ -191,8 +188,6 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp)
assert(exp->blk != NULL);
QLIST_INSERT_HEAD(&block_exports, exp, next);
aio_context_release(ctx);
return exp;
fail:
@ -200,7 +195,6 @@ fail:
blk_set_dev_ops(blk, NULL, NULL);
blk_unref(blk);
}
aio_context_release(ctx);
if (exp) {
g_free(exp->id);
g_free(exp);
@ -218,9 +212,6 @@ void blk_exp_ref(BlockExport *exp)
static void blk_exp_delete_bh(void *opaque)
{
BlockExport *exp = opaque;
AioContext *aio_context = exp->ctx;
aio_context_acquire(aio_context);
assert(exp->refcount == 0);
QLIST_REMOVE(exp, next);
@ -230,8 +221,6 @@ static void blk_exp_delete_bh(void *opaque)
qapi_event_send_block_export_deleted(exp->id);
g_free(exp->id);
g_free(exp);
aio_context_release(aio_context);
}
void blk_exp_unref(BlockExport *exp)
@ -249,22 +238,16 @@ void blk_exp_unref(BlockExport *exp)
* connections and other internally held references start to shut down. When
* the function returns, there may still be active references while the export
* is in the process of shutting down.
*
* Acquires exp->ctx internally. Callers must *not* hold the lock.
*/
void blk_exp_request_shutdown(BlockExport *exp)
{
AioContext *aio_context = exp->ctx;
aio_context_acquire(aio_context);
/*
* If the user doesn't own the export any more, it is already shutting
* down. We must not call .request_shutdown and decrease the refcount a
* second time.
*/
if (!exp->user_owned) {
goto out;
return;
}
exp->drv->request_shutdown(exp);
@ -272,9 +255,6 @@ void blk_exp_request_shutdown(BlockExport *exp)
assert(exp->user_owned);
exp->user_owned = false;
blk_exp_unref(exp);
out:
aio_context_release(aio_context);
}
/*

45
block/io.c
View File

@ -294,8 +294,6 @@ static void bdrv_co_drain_bh_cb(void *opaque)
BlockDriverState *bs = data->bs;
if (bs) {
AioContext *ctx = bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
bdrv_dec_in_flight(bs);
if (data->begin) {
bdrv_do_drained_begin(bs, data->parent, data->poll);
@ -303,7 +301,6 @@ static void bdrv_co_drain_bh_cb(void *opaque)
assert(!data->poll);
bdrv_do_drained_end(bs, data->parent);
}
aio_context_release(ctx);
} else {
assert(data->begin);
bdrv_drain_all_begin();
@ -320,8 +317,6 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
{
BdrvCoDrainData data;
Coroutine *self = qemu_coroutine_self();
AioContext *ctx = bdrv_get_aio_context(bs);
AioContext *co_ctx = qemu_coroutine_get_aio_context(self);
/* Calling bdrv_drain() from a BH ensures the current coroutine yields and
* other coroutines run if they were queued by aio_co_enter(). */
@ -340,17 +335,6 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
bdrv_inc_in_flight(bs);
}
/*
* Temporarily drop the lock across yield or we would get deadlocks.
* bdrv_co_drain_bh_cb() reaquires the lock as needed.
*
* When we yield below, the lock for the current context will be
* released, so if this is actually the lock that protects bs, don't drop
* it a second time.
*/
if (ctx != co_ctx) {
aio_context_release(ctx);
}
replay_bh_schedule_oneshot_event(qemu_get_aio_context(),
bdrv_co_drain_bh_cb, &data);
@ -358,11 +342,6 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
/* If we are resumed from some other event (such as an aio completion or a
* timer callback), it is a bug in the caller that should be fixed. */
assert(data.done);
/* Reacquire the AioContext of bs if we dropped it */
if (ctx != co_ctx) {
aio_context_acquire(ctx);
}
}
static void bdrv_do_drained_begin(BlockDriverState *bs, BdrvChild *parent,
@ -478,13 +457,12 @@ static bool bdrv_drain_all_poll(void)
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
/* bdrv_drain_poll() can't make changes to the graph and we are holding the
* main AioContext lock, so iterating bdrv_next_all_states() is safe. */
/*
* bdrv_drain_poll() can't make changes to the graph and we hold the BQL,
* so iterating bdrv_next_all_states() is safe.
*/
while ((bs = bdrv_next_all_states(bs))) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
result |= bdrv_drain_poll(bs, NULL, true);
aio_context_release(aio_context);
}
return result;
@ -525,11 +503,7 @@ void bdrv_drain_all_begin_nopoll(void)
/* Quiesce all nodes, without polling in-flight requests yet. The graph
* cannot change during this loop. */
while ((bs = bdrv_next_all_states(bs))) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_do_drained_begin(bs, NULL, false);
aio_context_release(aio_context);
}
}
@ -588,11 +562,7 @@ void bdrv_drain_all_end(void)
}
while ((bs = bdrv_next_all_states(bs))) {
AioContext *aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
bdrv_do_drained_end(bs, NULL);
aio_context_release(aio_context);
}
assert(qemu_get_current_aio_context() == qemu_get_aio_context());
@ -2368,15 +2338,10 @@ int bdrv_flush_all(void)
}
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
AioContext *aio_context = bdrv_get_aio_context(bs);
int ret;
aio_context_acquire(aio_context);
ret = bdrv_flush(bs);
int ret = bdrv_flush(bs);
if (ret < 0 && !result) {
result = ret;
}
aio_context_release(aio_context);
}
return result;

19
block/mirror.c
View File

@ -662,7 +662,6 @@ static int mirror_exit_common(Job *job)
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
BlockJob *bjob = &s->common;
MirrorBDSOpaque *bs_opaque;
AioContext *replace_aio_context = NULL;
BlockDriverState *src;
BlockDriverState *target_bs;
BlockDriverState *mirror_top_bs;
@ -677,7 +676,6 @@ static int mirror_exit_common(Job *job)
}
s->prepared = true;
aio_context_acquire(qemu_get_aio_context());
bdrv_graph_rdlock_main_loop();
mirror_top_bs = s->mirror_top_bs;
@ -742,11 +740,6 @@ static int mirror_exit_common(Job *job)
}
bdrv_graph_rdunlock_main_loop();
if (s->to_replace) {
replace_aio_context = bdrv_get_aio_context(s->to_replace);
aio_context_acquire(replace_aio_context);
}
if (s->should_complete && !abort) {
BlockDriverState *to_replace = s->to_replace ?: src;
bool ro = bdrv_is_read_only(to_replace);
@ -785,9 +778,6 @@ static int mirror_exit_common(Job *job)
error_free(s->replace_blocker);
bdrv_unref(s->to_replace);
}
if (replace_aio_context) {
aio_context_release(replace_aio_context);
}
g_free(s->replaces);
/*
@ -811,8 +801,6 @@ static int mirror_exit_common(Job *job)
bdrv_unref(mirror_top_bs);
bdrv_unref(src);
aio_context_release(qemu_get_aio_context());
return ret;
}
@ -1191,24 +1179,17 @@ static void mirror_complete(Job *job, Error **errp)
/* block all operations on to_replace bs */
if (s->replaces) {
AioContext *replace_aio_context;
s->to_replace = bdrv_find_node(s->replaces);
if (!s->to_replace) {
error_setg(errp, "Node name '%s' not found", s->replaces);
return;
}
replace_aio_context = bdrv_get_aio_context(s->to_replace);
aio_context_acquire(replace_aio_context);
/* TODO Translate this into child freeze system. */
error_setg(&s->replace_blocker,
"block device is in use by block-job-complete");
bdrv_op_block_all(s->to_replace, s->replace_blocker);
bdrv_ref(s->to_replace);
aio_context_release(replace_aio_context);
}
s->should_complete = true;

20
block/monitor/bitmap-qmp-cmds.c
View File

@ -95,7 +95,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
AioContext *aio_context;
if (!name || name[0] == '\0') {
error_setg(errp, "Bitmap name cannot be empty");
@ -107,14 +106,11 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (has_granularity) {
if (granularity < 512 || !is_power_of_2(granularity)) {
error_setg(errp, "Granularity must be power of 2 "
"and at least 512");
goto out;
return;
}
} else {
/* Default to cluster size, if available: */
@ -132,12 +128,12 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
if (persistent &&
!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))
{
goto out;
return;
}
bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
if (bitmap == NULL) {
goto out;
return;
}
if (disabled) {
@ -145,9 +141,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
}
bdrv_dirty_bitmap_set_persistence(bitmap, persistent);
out:
aio_context_release(aio_context);
}
BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
@ -157,7 +150,6 @@ BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
{
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
AioContext *aio_context;
GLOBAL_STATE_CODE();
@ -166,19 +158,14 @@ BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
return NULL;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_BUSY | BDRV_BITMAP_RO,
errp)) {
aio_context_release(aio_context);
return NULL;
}
if (bdrv_dirty_bitmap_get_persistence(bitmap) &&
bdrv_remove_persistent_dirty_bitmap(bs, name, errp) < 0)
{
aio_context_release(aio_context);
return NULL;
}
@ -190,7 +177,6 @@ BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
*bitmap_bs = bs;
}
aio_context_release(aio_context);
return release ? NULL : bitmap;
}

29
block/monitor/block-hmp-cmds.c
View File

@ -141,7 +141,6 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
const char *id = qdict_get_str(qdict, "id");
BlockBackend *blk;
BlockDriverState *bs;
AioContext *aio_context;
Error *local_err = NULL;
GLOBAL_STATE_CODE();
@ -168,14 +167,10 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
return;
}
aio_context = blk_get_aio_context(blk);
aio_context_acquire(aio_context);
bs = blk_bs(blk);
if (bs) {
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
error_report_err(local_err);
aio_context_release(aio_context);
return;
}
@ -196,8 +191,6 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
} else {
blk_unref(blk);
}
aio_context_release(aio_context);
}
void hmp_commit(Monitor *mon, const QDict *qdict)
@ -213,7 +206,6 @@ void hmp_commit(Monitor *mon, const QDict *qdict)
ret = blk_commit_all();
} else {
BlockDriverState *bs;
AioContext *aio_context;
blk = blk_by_name(device);
if (!blk) {
@ -222,18 +214,13 @@ void hmp_commit(Monitor *mon, const QDict *qdict)
}
bs = bdrv_skip_implicit_filters(blk_bs(blk));
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!blk_is_available(blk)) {
error_report("Device '%s' has no medium", device);
aio_context_release(aio_context);
return;
}
ret = bdrv_commit(bs);
aio_context_release(aio_context);
}
if (ret < 0) {
error_report("'commit' error for '%s': %s", device, strerror(-ret));
@ -560,7 +547,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
BlockBackend *blk = NULL;
BlockDriverState *bs = NULL;
BlockBackend *local_blk = NULL;
AioContext *ctx = NULL;
bool qdev = qdict_get_try_bool(qdict, "qdev", false);
const char *device = qdict_get_str(qdict, "device");
const char *command = qdict_get_str(qdict, "command");
@ -582,9 +568,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
}
}
ctx = blk ? blk_get_aio_context(blk) : bdrv_get_aio_context(bs);
aio_context_acquire(ctx);
if (bs) {
blk = local_blk = blk_new(bdrv_get_aio_context(bs), 0, BLK_PERM_ALL);
ret = blk_insert_bs(blk, bs, &err);
@ -622,11 +605,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
fail:
blk_unref(local_blk);
if (ctx) {
aio_context_release(ctx);
}
hmp_handle_error(mon, err);
}
@ -882,7 +860,6 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
int nb_sns, i;
int total;
int *global_snapshots;
AioContext *aio_context;
typedef struct SnapshotEntry {
QEMUSnapshotInfo sn;
@ -909,11 +886,8 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
error_report_err(err);
return;
}
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
nb_sns = bdrv_snapshot_list(bs, &sn_tab);
aio_context_release(aio_context);
if (nb_sns < 0) {
monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
@ -924,9 +898,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
int bs1_nb_sns = 0;
ImageEntry *ie;
SnapshotEntry *se;
AioContext *ctx = bdrv_get_aio_context(bs1);
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs1)) {
sn = NULL;
bs1_nb_sns = bdrv_snapshot_list(bs1, &sn);
@ -944,7 +916,6 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
}
g_free(sn);
}
aio_context_release(ctx);
}
if (no_snapshot) {

27
block/qapi-sysemu.c
View File

@ -174,7 +174,6 @@ blockdev_remove_medium(const char *device, const char *id, Error **errp)
{