Get rid of the need to do re-expand and revert on an iterator when we
encounter a short IO, or failure that warrants a retry. Use the new
state save/restore helpers instead.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
fs/io_uring.c | 42 +++++++++++++++++++++++-------------------
1 file changed, 23 insertions(+), 19 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 855ea544807f..84e33f751372 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -712,6 +712,7 @@ struct io_async_rw {
struct iovec fast_iov[UIO_FASTIOV];
const struct iovec *free_iovec;
struct iov_iter iter;
+ struct iov_iter_state iter_state;
size_t bytes_done;
struct wait_page_queue wpq;
};
@@ -2608,8 +2609,7 @@ static bool io_resubmit_prep(struct io_kiocb *req)
if (!rw)
return !io_req_prep_async(req);
- /* may have left rw->iter inconsistent on -EIOCBQUEUED */
- iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter));
+ iov_iter_restore(&rw->iter, &rw->iter_state, 0);
return true;
}
@@ -3437,19 +3437,22 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
struct kiocb *kiocb = &req->rw.kiocb;
struct iov_iter __iter, *iter = &__iter;
struct io_async_rw *rw = req->async_data;
- ssize_t io_size, ret, ret2;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
+ struct iov_iter_state __state, *state;
+ ssize_t ret, ret2;
if (rw) {
iter = &rw->iter;
+ state = &rw->iter_state;
iovec = NULL;
} else {
ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock);
if (ret < 0)
return ret;
+ state = &__state;
}
- io_size = iov_iter_count(iter);
- req->result = io_size;
+ req->result = iov_iter_count(iter);
+ iov_iter_save_state(iter, state);
/* Ensure we clear previously set non-block flag */
if (!force_nonblock)
@@ -3463,7 +3466,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
return ret ?: -EAGAIN;
}
- ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size);
+ ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), state->count);
if (unlikely(ret)) {
kfree(iovec);
return ret;
@@ -3479,18 +3482,17 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
/* no retry on NONBLOCK nor RWF_NOWAIT */
if (req->flags & REQ_F_NOWAIT)
goto done;
- /* some cases will consume bytes even on error returns */
- iov_iter_reexpand(iter, iter->count + iter->truncated);
- iov_iter_revert(iter, io_size - iov_iter_count(iter));
ret = 0;
} else if (ret == -EIOCBQUEUED) {
goto out_free;
- } else if (ret <= 0 || ret == io_size || !force_nonblock ||
+ } else if (ret <= 0 || ret == state->count || !force_nonblock ||
(req->flags & REQ_F_NOWAIT) || !need_read_all(req)) {
/* read all, failed, already did sync or don't want to retry */
goto done;
}
+ iov_iter_restore(iter, state, ret);
+
ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
if (ret2)
return ret2;
@@ -3501,7 +3503,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
iter = &rw->iter;
do {
- io_size -= ret;
+ state->count -= ret;
rw->bytes_done += ret;
/* if we can retry, do so with the callbacks armed */
if (!io_rw_should_retry(req)) {
@@ -3520,7 +3522,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
return 0;
/* we got some bytes, but not all. retry. */
kiocb->ki_flags &= ~IOCB_WAITQ;
- } while (ret > 0 && ret < io_size);
+ } while (ret > 0 && ret < state->count);
done:
kiocb_done(kiocb, ret, issue_flags);
out_free:
@@ -3543,19 +3545,23 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
struct kiocb *kiocb = &req->rw.kiocb;
struct iov_iter __iter, *iter = &__iter;
struct io_async_rw *rw = req->async_data;
- ssize_t ret, ret2, io_size;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
+ struct iov_iter_state __state, *state;
+ ssize_t ret, ret2;
if (rw) {
iter = &rw->iter;
+ state = &rw->iter_state;
iovec = NULL;
} else {
ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock);
if (ret < 0)
return ret;
+ state = &__state;
}
- io_size = iov_iter_count(iter);
- req->result = io_size;
+ req->result = iov_iter_count(iter);
+ iov_iter_save_state(iter, state);
+ ret2 = 0;
/* Ensure we clear previously set non-block flag */
if (!force_nonblock)
@@ -3572,7 +3578,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
(req->flags & REQ_F_ISREG))
goto copy_iov;
- ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size);
+ ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), state->count);
if (unlikely(ret))
goto out_free;
@@ -3619,9 +3625,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
kiocb_done(kiocb, ret2, issue_flags);
} else {
copy_iov:
- /* some cases will consume bytes even on error returns */
- iov_iter_reexpand(iter, iter->count + iter->truncated);
- iov_iter_revert(iter, io_size - iov_iter_count(iter));
+ iov_iter_restore(iter, state, ret2);
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
return ret ?: -EAGAIN;
}
--
2.33.0
