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io_uring: don't re-setup vecs/iter in io_resumit_prep() is already there 

If we already have mapped the necessary data for retry, then don't set
it up again. It's a pointless operation, and we leak the iovec if it's
a large (non-stack) vec.

Fixes: b63534c41e ("io_uring: re-issue block requests that failed because of resources")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-14 09:28:14 -06:00
parent 6200b0ae4e
commit 8f3d749685
1 changed files with 10 additions and 6 deletions
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16
fs/io_uring.c
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@ -2294,13 +2294,17 @@ static bool io_resubmit_prep(struct io_kiocb *req, int error)
goto end_req;
}
ret = io_import_iovec(rw, req, &iovec, &iter, false);
if (ret < 0)
goto end_req;
ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false);
if (!ret)
if (!req->io) {
ret = io_import_iovec(rw, req, &iovec, &iter, false);
if (ret < 0)
goto end_req;
ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false);
if (!ret)
return true;
kfree(iovec);
} else {
return true;
kfree(iovec);
}
end_req:
req_set_fail_links(req);
io_req_complete(req, ret);