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io_uring: kill ref get/drop in personality init 

Don't take an identity on personality/creds init only to drop it a few
lines after. Extract a function which prepares req->work but leaves it
without identity.

Note: it's safe to not check REQ_F_WORK_INITIALIZED there because it's
nobody had a chance to init it before io_init_req().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-10-18 10:17:38 +01:00 committed by Jens Axboe
parent 2e5aa6cb4d
commit ec99ca6c47
1 changed files with 9 additions and 4 deletions
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13
fs/io_uring.c
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@ -1070,6 +1070,12 @@ static void io_init_identity(struct io_identity *id)
refcount_set(&id->count, 1);
}
static inline void __io_req_init_async(struct io_kiocb *req)
{
memset(&req->work, 0, sizeof(req->work));
req->flags |= REQ_F_WORK_INITIALIZED;
}
/*
* Note: must call io_req_init_async() for the first time you
* touch any members of io_wq_work.
@ -1081,8 +1087,7 @@ static inline void io_req_init_async(struct io_kiocb *req)
if (req->flags & REQ_F_WORK_INITIALIZED)
return;
memset(&req->work, 0, sizeof(req->work));
req->flags |= REQ_F_WORK_INITIALIZED;
__io_req_init_async(req);
/* Grab a ref if this isn't our static identity */
req->work.identity = tctx->identity;
@ -6504,12 +6509,12 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
if (id) {
struct io_identity *iod;
io_req_init_async(req);
iod = idr_find(&ctx->personality_idr, id);
if (unlikely(!iod))
return -EINVAL;
refcount_inc(&iod->count);
io_put_identity(current->io_uring, req);
__io_req_init_async(req);
get_cred(iod->creds);
req->work.identity = iod;
req->work.flags |= IO_WQ_WORK_CREDS;