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-rw-r--r--fs/io_uring.c82
1 files changed, 61 insertions, 21 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 855ea544807f..25bda8a5a4e5 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);
return true;
}
@@ -3310,12 +3310,17 @@ static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
if (!force && !io_op_defs[req->opcode].needs_async_setup)
return 0;
if (!req->async_data) {
+ struct io_async_rw *iorw;
+
if (io_alloc_async_data(req)) {
kfree(iovec);
return -ENOMEM;
}
io_req_map_rw(req, iovec, fast_iov, iter);
+ iorw = req->async_data;
+ /* we've copied and mapped the iter, ensure state is saved */
+ iov_iter_save_state(&iorw->iter, &iorw->iter_state);
}
return 0;
}
@@ -3334,6 +3339,7 @@ static inline int io_rw_prep_async(struct io_kiocb *req, int rw)
iorw->free_iovec = iov;
if (iov)
req->flags |= REQ_F_NEED_CLEANUP;
+ iov_iter_save_state(&iorw->iter, &iorw->iter_state);
return 0;
}
@@ -3437,19 +3443,28 @@ 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;
+ /*
+ * We come here from an earlier attempt, restore our state to
+ * match in case it doesn't. It's cheap enough that we don't
+ * need to make this conditional.
+ */
+ iov_iter_restore(iter, state);
iovec = NULL;
} else {
ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock);
if (ret < 0)
return ret;
+ state = &__state;
+ iov_iter_save_state(iter, state);
}
- io_size = iov_iter_count(iter);
- req->result = io_size;
+ req->result = iov_iter_count(iter);
/* Ensure we clear previously set non-block flag */
if (!force_nonblock)
@@ -3463,7 +3478,7 @@ 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), req->result);
if (unlikely(ret)) {
kfree(iovec);
return ret;
@@ -3479,30 +3494,49 @@ 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 == req->result || !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;
}
+ /*
+ * Don't depend on the iter state matching what was consumed, or being
+ * untouched in case of error. Restore it and we'll advance it
+ * manually if we need to.
+ */
+ iov_iter_restore(iter, state);
+
ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
if (ret2)
return ret2;
iovec = NULL;
rw = req->async_data;
- /* now use our persistent iterator, if we aren't already */
- iter = &rw->iter;
+ /*
+ * Now use our persistent iterator and state, if we aren't already.
+ * We've restored and mapped the iter to match.
+ */
+ if (iter != &rw->iter) {
+ iter = &rw->iter;
+ state = &rw->iter_state;
+ }
do {
- io_size -= ret;
+ /*
+ * We end up here because of a partial read, either from
+ * above or inside this loop. Advance the iter by the bytes
+ * that were consumed.
+ */
+ iov_iter_advance(iter, ret);
+ if (!iov_iter_count(iter))
+ break;
rw->bytes_done += ret;
+ iov_iter_save_state(iter, state);
+
/* if we can retry, do so with the callbacks armed */
if (!io_rw_should_retry(req)) {
kiocb->ki_flags &= ~IOCB_WAITQ;
@@ -3520,7 +3554,8 @@ 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);
+ iov_iter_restore(iter, state);
+ } while (ret > 0);
done:
kiocb_done(kiocb, ret, issue_flags);
out_free:
@@ -3543,19 +3578,24 @@ 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;
+ iov_iter_restore(iter, state);
iovec = NULL;
} else {
ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock);
if (ret < 0)
return ret;
+ state = &__state;
+ iov_iter_save_state(iter, state);
}
- io_size = iov_iter_count(iter);
- req->result = io_size;
+ req->result = iov_iter_count(iter);
+ ret2 = 0;
/* Ensure we clear previously set non-block flag */
if (!force_nonblock)
@@ -3572,7 +3612,7 @@ 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), req->result);
if (unlikely(ret))
goto out_free;
@@ -3619,9 +3659,9 @@ done:
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);
+ if (ret2 > 0)
+ iov_iter_advance(iter, ret2);
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
return ret ?: -EAGAIN;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 22:58:03 +0000