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| author | Keith Busch <kbusch@kernel.org> | 2025-02-27 14:39:14 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-02-28 07:05:36 -0700 |
| commit | 27cb27b6d5ea401143ca3648983342bb820c4be9 (patch) | |
| tree | 57e120597af207b8d4d83502d0f6353d3ab6bd34 /io_uring/rw.c | |
| parent | 99fde895ff56ac2241e7b7b4566731d72f2fdaa7 (diff) | |
| download | linux-27cb27b6d5ea401143ca3648983342bb820c4be9.tar.gz linux-27cb27b6d5ea401143ca3648983342bb820c4be9.tar.bz2 linux-27cb27b6d5ea401143ca3648983342bb820c4be9.zip | |
io_uring: add support for kernel registered bvecs
Provide an interface for the kernel to leverage the existing
pre-registered buffers that io_uring provides. User space can reference
these later to achieve zero-copy IO.
User space must register an empty fixed buffer table with io_uring in
order for the kernel to make use of it.
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20250227223916.143006-5-kbusch@meta.com
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/rw.c')
| -rw-r--r-- | io_uring/rw.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/io_uring/rw.c b/io_uring/rw.c index 7bc23802a388..5ee9f8949e8b 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -629,6 +629,7 @@ static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) */ static ssize_t loop_rw_iter(int ddir, struct io_rw *rw, struct iov_iter *iter) { + struct io_kiocb *req = cmd_to_io_kiocb(rw); struct kiocb *kiocb = &rw->kiocb; struct file *file = kiocb->ki_filp; ssize_t ret = 0; @@ -644,6 +645,8 @@ static ssize_t loop_rw_iter(int ddir, struct io_rw *rw, struct iov_iter *iter) if ((kiocb->ki_flags & IOCB_NOWAIT) && !(kiocb->ki_filp->f_flags & O_NONBLOCK)) return -EAGAIN; + if ((req->flags & REQ_F_BUF_NODE) && req->buf_node->buf->is_kbuf) + return -EFAULT; ppos = io_kiocb_ppos(kiocb); |