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s3: VFS: vfs_default. Pass in struct vfswrap_pread_state as the callback data to the subreq.

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Find the req we're finishing off by looking inside vfswrap_pread_state.
In a shutdown close the caller calls talloc_free(req), so we can't
access it directly as callback data.

The next commit will NULL out the vfswrap_pread_state->req pointer
when a caller calls talloc_free(req), and the request is still in
flight.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14301

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
This commit is contained in:
Jeremy Allison 2020-02-27 16:34:51 -08:00
parent 594a435b33
commit e102908f11
1 changed files with 4 additions and 5 deletions
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9
source3/modules/vfs_default.c
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@ -827,7 +827,7 @@ static struct tevent_req *vfswrap_pread_send(struct vfs_handle_struct *handle,
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, vfs_pread_done, req);
tevent_req_set_callback(subreq, vfs_pread_done, state);
talloc_set_destructor(state, vfs_pread_state_destructor);
@ -868,10 +868,9 @@ static int vfs_pread_state_destructor(struct vfswrap_pread_state *state)
static void vfs_pread_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct vfswrap_pread_state *state = tevent_req_data(
req, struct vfswrap_pread_state);
struct vfswrap_pread_state *state = tevent_req_callback_data(
subreq, struct vfswrap_pread_state);
struct tevent_req *req = state->req;
int ret;
ret = pthreadpool_tevent_job_recv(subreq);