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io_uring: fix truncated async read/readv and write/writev retry 

Ensure we keep the truncated value, if we did truncate it. If not, we
might read/write more than the registered buffer size.

Also for retry, ensure that we return the truncated mapped value for
the vectorized versions of the read/write commands.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sensors
Jens Axboe 2020-03-11 12:27:04 -06:00
parent bbbdeb4720
commit 3f9d64415f
1 changed files with 5 additions and 2 deletions
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7
fs/io_uring.c
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@ -2360,6 +2360,7 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
*iovec = NULL;
return PTR_ERR(buf);
}
req->rw.len = sqe_len;
}
ret = import_single_range(rw, buf, sqe_len, *iovec, iter);
@ -2379,8 +2380,10 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
if (req->flags & REQ_F_BUFFER_SELECT) {
ret = io_iov_buffer_select(req, *iovec, needs_lock);
if (!ret)
iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len);
if (!ret) {
ret = (*iovec)->iov_len;
iov_iter_init(iter, rw, *iovec, 1, ret);
}
*iovec = NULL;
return ret;
}