forked from mirrors/linux
fs,io_uring: add infrastructure for uring-cmd
file_operations->uring_cmd is a file private handler. This is somewhat similar to ioctl but hopefully a lot more sane and useful as it can be used to enable many io_uring capabilities for the underlying operation. IORING_OP_URING_CMD is a file private kind of request. io_uring doesn't know what is in this command type, it's for the provider of ->uring_cmd() to deal with. Co-developed-by: Kanchan Joshi <joshi.k@samsung.com> Signed-off-by: Kanchan Joshi <joshi.k@samsung.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220511054750.20432-2-joshi.k@samsung.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
2bb04df7c2
commit
ee692a21e9
4 changed files with 165 additions and 26 deletions
135
fs/io_uring.c
135
fs/io_uring.c
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@ -202,13 +202,6 @@ struct io_rings {
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struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp;
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};
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enum io_uring_cmd_flags {
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IO_URING_F_COMPLETE_DEFER = 1,
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IO_URING_F_UNLOCKED = 2,
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/* int's last bit, sign checks are usually faster than a bit test */
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IO_URING_F_NONBLOCK = INT_MIN,
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};
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struct io_mapped_ubuf {
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u64 ubuf;
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u64 ubuf_end;
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@ -972,6 +965,7 @@ struct io_kiocb {
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struct io_xattr xattr;
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struct io_socket sock;
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struct io_nop nop;
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struct io_uring_cmd uring_cmd;
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};
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u8 opcode;
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@ -1050,6 +1044,14 @@ struct io_cancel_data {
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int seq;
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};
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/*
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* The URING_CMD payload starts at 'cmd' in the first sqe, and continues into
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* the following sqe if SQE128 is used.
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*/
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#define uring_cmd_pdu_size(is_sqe128) \
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((1 + !!(is_sqe128)) * sizeof(struct io_uring_sqe) - \
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offsetof(struct io_uring_sqe, cmd))
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struct io_op_def {
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/* needs req->file assigned */
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unsigned needs_file : 1;
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@ -1289,6 +1291,12 @@ static const struct io_op_def io_op_defs[] = {
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[IORING_OP_SOCKET] = {
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.audit_skip = 1,
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},
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[IORING_OP_URING_CMD] = {
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.needs_file = 1,
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.plug = 1,
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.needs_async_setup = 1,
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.async_size = uring_cmd_pdu_size(1),
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},
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};
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/* requests with any of those set should undergo io_disarm_next() */
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@ -1428,6 +1436,8 @@ const char *io_uring_get_opcode(u8 opcode)
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return "GETXATTR";
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case IORING_OP_SOCKET:
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return "SOCKET";
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case IORING_OP_URING_CMD:
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return "URING_CMD";
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case IORING_OP_LAST:
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return "INVALID";
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}
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@ -4507,10 +4517,6 @@ static int __io_getxattr_prep(struct io_kiocb *req,
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const char __user *name;
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int ret;
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if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
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return -EINVAL;
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if (unlikely(sqe->ioprio))
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return -EINVAL;
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if (unlikely(req->flags & REQ_F_FIXED_FILE))
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return -EBADF;
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@ -4620,10 +4626,6 @@ static int __io_setxattr_prep(struct io_kiocb *req,
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const char __user *name;
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int ret;
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if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
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return -EINVAL;
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if (unlikely(sqe->ioprio))
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return -EINVAL;
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if (unlikely(req->flags & REQ_F_FIXED_FILE))
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return -EBADF;
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@ -4910,6 +4912,96 @@ static int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
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return 0;
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}
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static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
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{
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req->uring_cmd.task_work_cb(&req->uring_cmd);
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}
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void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *))
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{
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struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd);
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req->uring_cmd.task_work_cb = task_work_cb;
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req->io_task_work.func = io_uring_cmd_work;
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io_req_task_work_add(req, !!(req->ctx->flags & IORING_SETUP_SQPOLL));
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
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/*
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* Called by consumers of io_uring_cmd, if they originally returned
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* -EIOCBQUEUED upon receiving the command.
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*/
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void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
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{
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struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd);
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if (ret < 0)
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req_set_fail(req);
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if (req->ctx->flags & IORING_SETUP_CQE32)
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__io_req_complete32(req, 0, ret, 0, res2, 0);
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else
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io_req_complete(req, ret);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_done);
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static int io_uring_cmd_prep_async(struct io_kiocb *req)
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{
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size_t cmd_size;
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cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
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memcpy(req->async_data, req->uring_cmd.cmd, cmd_size);
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return 0;
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}
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static int io_uring_cmd_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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struct io_uring_cmd *ioucmd = &req->uring_cmd;
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if (sqe->rw_flags)
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return -EINVAL;
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ioucmd->cmd = sqe->cmd;
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ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
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return 0;
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}
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static int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_uring_cmd *ioucmd = &req->uring_cmd;
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struct io_ring_ctx *ctx = req->ctx;
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struct file *file = req->file;
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int ret;
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if (!req->file->f_op->uring_cmd)
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return -EOPNOTSUPP;
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if (ctx->flags & IORING_SETUP_SQE128)
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issue_flags |= IO_URING_F_SQE128;
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if (ctx->flags & IORING_SETUP_CQE32)
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issue_flags |= IO_URING_F_CQE32;
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if (ctx->flags & IORING_SETUP_IOPOLL)
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issue_flags |= IO_URING_F_IOPOLL;
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if (req_has_async_data(req))
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ioucmd->cmd = req->async_data;
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ret = file->f_op->uring_cmd(ioucmd, issue_flags);
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if (ret == -EAGAIN) {
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if (!req_has_async_data(req)) {
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if (io_alloc_async_data(req))
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return -ENOMEM;
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io_uring_cmd_prep_async(req);
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}
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return -EAGAIN;
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}
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if (ret != -EIOCBQUEUED)
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io_uring_cmd_done(ioucmd, ret, 0);
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return 0;
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}
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static int io_shutdown_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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@ -6305,9 +6397,7 @@ static int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_socket *sock = &req->sock;
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if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
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return -EINVAL;
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if (sqe->ioprio || sqe->addr || sqe->rw_flags || sqe->buf_index)
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if (sqe->addr || sqe->rw_flags || sqe->buf_index)
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return -EINVAL;
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sock->domain = READ_ONCE(sqe->fd);
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@ -7755,6 +7845,8 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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return io_getxattr_prep(req, sqe);
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case IORING_OP_SOCKET:
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return io_socket_prep(req, sqe);
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case IORING_OP_URING_CMD:
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return io_uring_cmd_prep(req, sqe);
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}
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printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
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@ -7787,6 +7879,8 @@ static int io_req_prep_async(struct io_kiocb *req)
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return io_recvmsg_prep_async(req);
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case IORING_OP_CONNECT:
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return io_connect_prep_async(req);
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case IORING_OP_URING_CMD:
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return io_uring_cmd_prep_async(req);
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}
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printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n",
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req->opcode);
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@ -8081,6 +8175,9 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
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case IORING_OP_SOCKET:
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ret = io_socket(req, issue_flags);
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break;
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case IORING_OP_URING_CMD:
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ret = io_uring_cmd(req, issue_flags);
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break;
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default:
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ret = -EINVAL;
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break;
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@ -12699,6 +12796,8 @@ static int __init io_uring_init(void)
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BUILD_BUG_ON(sizeof(atomic_t) != sizeof(u32));
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BUILD_BUG_ON(sizeof(struct io_uring_cmd) > 64);
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req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC |
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SLAB_ACCOUNT);
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return 0;
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@ -1953,6 +1953,7 @@ struct dir_context {
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#define REMAP_FILE_ADVISORY (REMAP_FILE_CAN_SHORTEN)
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struct iov_iter;
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struct io_uring_cmd;
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struct file_operations {
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struct module *owner;
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@ -1995,6 +1996,7 @@ struct file_operations {
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struct file *file_out, loff_t pos_out,
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loff_t len, unsigned int remap_flags);
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int (*fadvise)(struct file *, loff_t, loff_t, int);
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int (*uring_cmd)(struct io_uring_cmd *ioucmd, unsigned int issue_flags);
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} __randomize_layout;
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struct inode_operations {
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@ -5,7 +5,32 @@
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#include <linux/sched.h>
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#include <linux/xarray.h>
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enum io_uring_cmd_flags {
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IO_URING_F_COMPLETE_DEFER = 1,
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IO_URING_F_UNLOCKED = 2,
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/* int's last bit, sign checks are usually faster than a bit test */
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IO_URING_F_NONBLOCK = INT_MIN,
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/* ctx state flags, for URING_CMD */
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IO_URING_F_SQE128 = 4,
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IO_URING_F_CQE32 = 8,
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IO_URING_F_IOPOLL = 16,
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};
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struct io_uring_cmd {
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struct file *file;
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const void *cmd;
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/* callback to defer completions to task context */
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void (*task_work_cb)(struct io_uring_cmd *cmd);
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u32 cmd_op;
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u32 pad;
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u8 pdu[32]; /* available inline for free use */
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};
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#if defined(CONFIG_IO_URING)
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void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2);
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void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *));
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struct sock *io_uring_get_socket(struct file *file);
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void __io_uring_cancel(bool cancel_all);
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void __io_uring_free(struct task_struct *tsk);
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@ -30,6 +55,14 @@ static inline void io_uring_free(struct task_struct *tsk)
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__io_uring_free(tsk);
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}
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#else
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static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
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ssize_t ret2)
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{
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}
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static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *))
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{
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}
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static inline struct sock *io_uring_get_socket(struct file *file)
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{
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return NULL;
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@ -22,6 +22,7 @@ struct io_uring_sqe {
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union {
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__u64 off; /* offset into file */
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__u64 addr2;
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__u32 cmd_op;
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};
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union {
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__u64 addr; /* pointer to buffer or iovecs */
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@ -61,14 +62,17 @@ struct io_uring_sqe {
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__s32 splice_fd_in;
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__u32 file_index;
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};
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__u64 addr3;
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__u64 __pad2[1];
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/*
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* If the ring is initialized with IORING_SETUP_SQE128, then this field
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* contains 64-bytes of padding, doubling the size of the SQE.
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*/
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__u64 __big_sqe_pad[0];
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union {
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struct {
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__u64 addr3;
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__u64 __pad2[1];
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};
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/*
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* If the ring is initialized with IORING_SETUP_SQE128, then
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* this field is used for 80 bytes of arbitrary command data
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*/
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__u8 cmd[0];
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};
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};
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enum {
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@ -175,6 +179,7 @@ enum io_uring_op {
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IORING_OP_FGETXATTR,
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IORING_OP_GETXATTR,
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IORING_OP_SOCKET,
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IORING_OP_URING_CMD,
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/* this goes last, obviously */
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IORING_OP_LAST,
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