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io_uring: let io_setup_async_rw take care of iovec 

Now we give out ownership of iovec into io_setup_async_rw(), so it
either sets request's context right or frees the iovec on error itself.
Makes our life a bit easier at call sites.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-04 13:52:01 +00:00 committed by Jens Axboe
parent 1a2cc0ce8d
commit 6bf985dc50
1 changed files with 9 additions and 15 deletions
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24
fs/io_uring.c
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@ -2721,11 +2721,7 @@ static bool io_resubmit_prep(struct io_kiocb *req)
ret = io_import_iovec(rw, req, &iovec, &iter, false);
if (ret < 0)
return false;
ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false);
if (!ret)
return true;
kfree(iovec);
return false;
return !io_setup_async_rw(req, iovec, inline_vecs, &iter, false);
}
#endif
@ -3366,8 +3362,10 @@ static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
if (!force && !io_op_defs[req->opcode].needs_async_data)
return 0;
if (!req->async_data) {
if (__io_alloc_async_data(req))
if (__io_alloc_async_data(req)) {
kfree(iovec);
return -ENOMEM;
}
io_req_map_rw(req, iovec, fast_iov, iter);
}
@ -3528,9 +3526,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
/* If the file doesn't support async, just async punt */
if (force_nonblock && !io_file_supports_async(req->file, READ)) {
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
if (!ret)
return -EAGAIN;
goto out_free;
return ret ?: -EAGAIN;
}
ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size);
@ -3565,10 +3561,9 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
}
ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
if (ret2) {
ret = ret2;
goto out_free;
}
if (ret2)
return ret2;
rw = req->async_data;
/* it's copied and will be cleaned with ->io */
iovec = NULL;
@ -3703,8 +3698,7 @@ copy_iov:
/* some cases will consume bytes even on error returns */
iov_iter_revert(iter, io_size - iov_iter_count(iter));
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
if (!ret)
return -EAGAIN;
return ret ?: -EAGAIN;
}
out_free:
/* it's reportedly faster than delegating the null check to kfree() */