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qed: make bdrv_qed_do_open a coroutine_fn 

It is called from qed_invalidate_cache in coroutine context (incoming
migration runs in a coroutine), so it's cleaner if metadata is always
loaded from a coroutine.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1516279431-30424-5-git-send-email-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-03-01 17:36:17 +01:00 committed by Kevin Wolf
parent 1fafcd9368
commit 9fb4dfc570
1 changed files with 37 additions and 3 deletions
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40
block/qed.c
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@ -381,8 +381,9 @@ static void bdrv_qed_init_state(BlockDriverState *bs)
qemu_co_queue_init(&s->allocating_write_reqs);
}
static int bdrv_qed_do_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
/* Called with table_lock held. */
static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
int flags, Error **errp)
{
BDRVQEDState *s = bs->opaque;
QEDHeader le_header;
@ -513,9 +514,35 @@ out:
return ret;
}
typedef struct QEDOpenCo {
BlockDriverState *bs;
QDict *options;
int flags;
Error **errp;
int ret;
} QEDOpenCo;
static void coroutine_fn bdrv_qed_open_entry(void *opaque)
{
QEDOpenCo *qoc = opaque;
BDRVQEDState *s = qoc->bs->opaque;
qemu_co_mutex_lock(&s->table_lock);
qoc->ret = bdrv_qed_do_open(qoc->bs, qoc->options, qoc->flags, qoc->errp);
qemu_co_mutex_unlock(&s->table_lock);
}
static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
QEDOpenCo qoc = {
.bs = bs,
.options = options,
.flags = flags,
.errp = errp,
.ret = -EINPROGRESS
};
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
@ -523,7 +550,14 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
}
bdrv_qed_init_state(bs);
return bdrv_qed_do_open(bs, options, flags, errp);
if (qemu_in_coroutine()) {
bdrv_qed_open_entry(&qoc);
} else {
qemu_coroutine_enter(qemu_coroutine_create(bdrv_qed_open_entry, &qoc));
BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS);
}
BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS);
return qoc.ret;
}
static void bdrv_qed_refresh_limits(BlockDriverState *bs, Error **errp)