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This series introduces kernel-managed buffer rings, where the kernel allocates and manages the buffers on behalf of the application. This is split out from the fuse over io_uring series in [1], which needs the kernel to own and manage buffers shared between the fuse server and the kernel. This series is on top of the for-next branch in Jens' io-uring tree. The corresponding liburing changes are in [2] and will be submitted after the changes in this patchset are accepted. Thanks, Joanne [1] https://lore.kernel.org/linux-fsdevel/20260116233044.1532965-1-joannelkoong@gmail.com/ [2] https://github.com/joannekoong/liburing/tree/kmbuf Changelog --------- Changes since [1]: * add "if (bl)" check for recycling API (Bernd) * check mul overflow, use GFP_USER, use PTR as return type (Christoph) * fix bl->ring leak (me) Joanne Koong (11): io_uring/kbuf: refactor io_register_pbuf_ring() logic into generic helpers io_uring/kbuf: rename io_unregister_pbuf_ring() to io_unregister_buf_ring() io_uring/kbuf: add support for kernel-managed buffer rings io_uring/kbuf: add mmap support for kernel-managed buffer rings io_uring/kbuf: support kernel-managed buffer rings in buffer selection io_uring/kbuf: add buffer ring pinning/unpinning io_uring/kbuf: add recycling for kernel managed buffer rings io_uring/kbuf: add io_uring_is_kmbuf_ring() io_uring/kbuf: export io_ring_buffer_select() io_uring/kbuf: return buffer id in buffer selection io_uring/cmd: set selected buffer index in __io_uring_cmd_done() include/linux/io_uring/cmd.h | 53 ++++- include/linux/io_uring_types.h | 10 +- include/uapi/linux/io_uring.h | 17 +- io_uring/kbuf.c | 365 +++++++++++++++++++++++++++------ io_uring/kbuf.h | 19 +- io_uring/memmap.c | 116 ++++++++++- io_uring/memmap.h | 4 + io_uring/register.c | 9 +- io_uring/uring_cmd.c | 6 +- 9 files changed, 526 insertions(+), 73 deletions(-) -- 2.47.3