[11/14] io_uring/rsrc: add io_rsrc_node_lookup() helper

Message ID	20241029152249.667290-12-axboe@kernel.dk (mailing list archive)
State	New
Headers	show Received: from mail-io1-f53.google.com (mail-io1-f53.google.com [209.85.166.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A7DC5194A64 for <io-uring@vger.kernel.org>; Tue, 29 Oct 2024 15:23:17 +0000 (UTC) From: Jens Axboe <axboe@kernel.dk> To: io-uring@vger.kernel.org Cc: Jens Axboe <axboe@kernel.dk> Subject: [PATCH 11/14] io_uring/rsrc: add io_rsrc_node_lookup() helper Date: Tue, 29 Oct 2024 09:16:40 -0600 Message-ID: <20241029152249.667290-12-axboe@kernel.dk> In-Reply-To: <20241029152249.667290-1-axboe@kernel.dk> References: <20241029152249.667290-1-axboe@kernel.dk> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	Rewrite rsrc node handling \| expand [PATCHSET,v3,0/14] Rewrite rsrc node handling [01/14] io_uring/nop: add support for testing registered files and buffers [02/14] io_uring/rsrc: move struct io_fixed_file to rsrc.h header [03/14] io_uring: specify freeptr usage for SLAB_TYPESAFE_BY_RCU io_kiocb cache [04/14] io_uring/splice: open code 2nd direct file assignment [05/14] io_uring/rsrc: kill io_charge_rsrc_node() [06/14] io_uring/rsrc: get rid of per-ring io_rsrc_node list [07/14] io_uring/rsrc: get rid of io_rsrc_node allocation cache [08/14] io_uring/rsrc: add an empty io_rsrc_node for sparse buffer entries [09/14] io_uring: only initialize io_kiocb rsrc_nodes when needed [10/14] io_uring/rsrc: unify file and buffer resource tables [11/14] io_uring/rsrc: add io_rsrc_node_lookup() helper [12/14] io_uring/filetable: remove io_file_from_index() helper [13/14] io_uring/filetable: kill io_reset_alloc_hint() helper [14/14] io_uring/rsrc: add io_reset_rsrc_node() helper

diff --git a/io_uring/cancel.c b/io_uring/cancel.c index 3a2996307025..bbca5cb69cb5 100644 --- a/io_uring/cancel.c +++ b/io_uring/cancel.c @@ -240,10 +240,12 @@ static int __io_sync_cancel(struct io_uring_task *tctx, /* fixed must be grabbed every time since we drop the uring_lock */ if ((cd->flags & IORING_ASYNC_CANCEL_FD) && (cd->flags & IORING_ASYNC_CANCEL_FD_FIXED)) { - if (unlikely(fd >= ctx->file_table.data.nr)) + struct io_rsrc_node *node; + + node = io_rsrc_node_lookup(&ctx->file_table.data, fd); + if (unlikely(!node)) return -EBADF; - fd = array_index_nospec(fd, ctx->file_table.data.nr); - cd->file = io_file_from_index(&ctx->file_table, fd); + cd->file = io_slot_file(node); if (!cd->file) return -EBADF; } diff --git a/io_uring/filetable.c b/io_uring/filetable.c index c1bea2d9dce2..1f22f183cdeb 100644 --- a/io_uring/filetable.c +++ b/io_uring/filetable.c @@ -58,7 +58,7 @@ static int io_install_fixed_file(struct io_ring_ctx *ctx, struct file *file, u32 slot_index) __must_hold(&req->ctx->uring_lock) { - struct io_rsrc_node *node; + struct io_rsrc_node *node, *old_node; if (io_is_uring_fops(file)) return -EBADF; @@ -71,9 +71,9 @@ static int io_install_fixed_file(struct io_ring_ctx *ctx, struct file *file, if (IS_ERR(node)) return -ENOMEM; - slot_index = array_index_nospec(slot_index, ctx->file_table.data.nr); - if (ctx->file_table.data.nodes[slot_index]) - io_put_rsrc_node(ctx->file_table.data.nodes[slot_index]); + old_node = io_rsrc_node_lookup(&ctx->file_table.data, slot_index); + if (old_node) + io_put_rsrc_node(old_node); else io_file_bitmap_set(&ctx->file_table, slot_index); @@ -123,15 +123,17 @@ int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags, int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset) { + struct io_rsrc_node *node; + if (unlikely(!ctx->file_table.data.nr)) return -ENXIO; if (offset >= ctx->file_table.data.nr) return -EINVAL; - offset = array_index_nospec(offset, ctx->file_table.data.nr); - if (!ctx->file_table.data.nodes[offset]) + node = io_rsrc_node_lookup(&ctx->file_table.data, offset); + if (!node) return -EBADF; - io_put_rsrc_node(ctx->file_table.data.nodes[offset]); + io_put_rsrc_node(node); ctx->file_table.data.nodes[offset] = NULL; io_file_bitmap_clear(&ctx->file_table, offset); return 0; diff --git a/io_uring/filetable.h b/io_uring/filetable.h index 664c31502dbb..29edda0caa65 100644 --- a/io_uring/filetable.h +++ b/io_uring/filetable.h @@ -52,7 +52,7 @@ static inline struct file *io_slot_file(struct io_rsrc_node *node) static inline struct file *io_file_from_index(struct io_file_table *table, int index) { - struct io_rsrc_node *node = table->data.nodes[index]; + struct io_rsrc_node *node = io_rsrc_node_lookup(&table->data, index); if (node) return io_slot_file(node); diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 78df515fb3a7..3a535e9e8ac3 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1879,16 +1879,12 @@ inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, struct file *file = NULL; io_ring_submit_lock(ctx, issue_flags); - if (unlikely((unsigned int)fd >= ctx->file_table.data.nr)) - goto out; - fd = array_index_nospec(fd, ctx->file_table.data.nr); - node = ctx->file_table.data.nodes[fd]; + node = io_rsrc_node_lookup(&ctx->file_table.data, fd); if (node) { io_req_assign_rsrc_node(req, node); req->flags |= io_slot_flags(node); file = io_slot_file(node); } -out: io_ring_submit_unlock(ctx, issue_flags); return file; } diff --git a/io_uring/msg_ring.c b/io_uring/msg_ring.c index b90ab3b8f5e0..99af39e1d0fb 100644 --- a/io_uring/msg_ring.c +++ b/io_uring/msg_ring.c @@ -172,22 +172,24 @@ static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags) return __io_msg_ring_data(target_ctx, msg, issue_flags); } -static struct file *io_msg_grab_file(struct io_kiocb *req, unsigned int issue_flags) +static int io_msg_grab_file(struct io_kiocb *req, unsigned int issue_flags) { struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg); struct io_ring_ctx *ctx = req->ctx; - struct file *file = NULL; - int idx = msg->src_fd; + struct io_rsrc_node *node; + int ret = -EBADF; io_ring_submit_lock(ctx, issue_flags); - if (likely(idx < ctx->file_table.data.nr)) { - idx = array_index_nospec(idx, ctx->file_table.data.nr); - file = io_file_from_index(&ctx->file_table, idx); - if (file) - get_file(file); + node = io_rsrc_node_lookup(&ctx->file_table.data, msg->src_fd); + if (node) { + msg->src_file = io_slot_file(node); + if (msg->src_file) + get_file(msg->src_file); + req->flags |= REQ_F_NEED_CLEANUP; + ret = 0; } io_ring_submit_unlock(ctx, issue_flags); - return file; + return ret; } static int io_msg_install_complete(struct io_kiocb *req, unsigned int issue_flags) @@ -256,7 +258,6 @@ static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags) struct io_ring_ctx *target_ctx = req->file->private_data; struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg); struct io_ring_ctx *ctx = req->ctx; - struct file *src_file = msg->src_file; if (msg->len) return -EINVAL; @@ -264,12 +265,10 @@ static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags) return -EINVAL; if (target_ctx->flags & IORING_SETUP_R_DISABLED) return -EBADFD; - if (!src_file) { - src_file = io_msg_grab_file(req, issue_flags); - if (!src_file) - return -EBADF; - msg->src_file = src_file; - req->flags |= REQ_F_NEED_CLEANUP; + if (!msg->src_file) { + int ret = io_msg_grab_file(req, issue_flags); + if (unlikely(ret)) + return ret; } if (io_msg_need_remote(target_ctx)) diff --git a/io_uring/net.c b/io_uring/net.c index 3e1f31574abb..2f7b334ed708 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1343,13 +1343,11 @@ static int io_send_zc_import(struct io_kiocb *req, unsigned int issue_flags) if (sr->flags & IORING_RECVSEND_FIXED_BUF) { struct io_ring_ctx *ctx = req->ctx; struct io_rsrc_node *node; - int idx; ret = -EFAULT; io_ring_submit_lock(ctx, issue_flags); - if (sr->buf_index < ctx->buf_table.nr) { - idx = array_index_nospec(sr->buf_index, ctx->buf_table.nr); - node = ctx->buf_table.nodes[idx]; + node = io_rsrc_node_lookup(&ctx->buf_table, sr->buf_index); + if (node) { io_req_assign_rsrc_node(sr->notif, node); ret = 0; } diff --git a/io_uring/nop.c b/io_uring/nop.c index 0dac01127de5..149dbdc53607 100644 --- a/io_uring/nop.c +++ b/io_uring/nop.c @@ -62,13 +62,11 @@ int io_nop(struct io_kiocb *req, unsigned int issue_flags) if (nop->flags & IORING_NOP_FIXED_BUFFER) { struct io_ring_ctx *ctx = req->ctx; struct io_rsrc_node *node; - int idx; ret = -EFAULT; io_ring_submit_lock(ctx, issue_flags); - if (nop->buffer < ctx->buf_table.nr) { - idx = array_index_nospec(nop->buffer, ctx->buf_table.nr); - node = READ_ONCE(ctx->buf_table.nodes[idx]); + node = io_rsrc_node_lookup(&ctx->buf_table, nop->buffer); + if (node) { io_req_assign_rsrc_node(req, node); ret = 0; } diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 902e003704a9..0924c53dd954 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -182,6 +182,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, return -EINVAL; for (done = 0; done < nr_args; done++) { + struct io_rsrc_node *node; u64 tag = 0; if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || @@ -196,9 +197,10 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, if (fd == IORING_REGISTER_FILES_SKIP) continue; - i = array_index_nospec(up->offset + done, ctx->file_table.data.nr); - if (ctx->file_table.data.nodes[i]) { - io_put_rsrc_node(ctx->file_table.data.nodes[i]); + i = up->offset + done; + node = io_rsrc_node_lookup(&ctx->file_table.data, i); + if (node) { + io_put_rsrc_node(node); ctx->file_table.data.nodes[i] = NULL; io_file_bitmap_clear(&ctx->file_table, i); } @@ -961,9 +963,9 @@ static int io_clone_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx goto out_unlock; for (i = 0; i < nbufs; i++) { - struct io_rsrc_node *src_node = src_ctx->buf_table.nodes[i]; - struct io_rsrc_node *dst_node; + struct io_rsrc_node *dst_node, *src_node; + src_node = io_rsrc_node_lookup(&src_ctx->buf_table, i); if (src_node == rsrc_empty_node) { dst_node = rsrc_empty_node; } else { diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index 438e0ac6abf7..6952fb45f57a 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -71,6 +71,14 @@ int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, extern const struct io_rsrc_node empty_node; #define rsrc_empty_node (struct io_rsrc_node *) &empty_node +static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data, + int index) +{ + if (index < data->nr) + return data->nodes[array_index_nospec(index, data->nr)]; + return NULL; +} + static inline void io_put_rsrc_node(struct io_rsrc_node *node) { if (node != rsrc_empty_node && !--node->refs) diff --git a/io_uring/rw.c b/io_uring/rw.c index 28fff18ebb19..30448f343c7f 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -332,17 +332,15 @@ static int io_prep_rw_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe struct io_ring_ctx *ctx = req->ctx; struct io_rsrc_node *node; struct io_async_rw *io; - u16 index; int ret; ret = io_prep_rw(req, sqe, ddir, false); if (unlikely(ret)) return ret; - if (unlikely(req->buf_index >= ctx->buf_table.nr)) + node = io_rsrc_node_lookup(&ctx->buf_table, req->buf_index); + if (!node) return -EFAULT; - index = array_index_nospec(req->buf_index, ctx->buf_table.nr); - node = ctx->buf_table.nodes[index]; io_req_assign_rsrc_node(req, node); io = req->async_data; diff --git a/io_uring/splice.c b/io_uring/splice.c index aaaddb66e90a..deeb8bb18651 100644 --- a/io_uring/splice.c +++ b/io_uring/splice.c @@ -66,17 +66,13 @@ static struct file *io_splice_get_file(struct io_kiocb *req, return io_file_get_normal(req, sp->splice_fd_in); io_ring_submit_lock(ctx, issue_flags); - if (unlikely(sp->splice_fd_in >= ctx->file_table.data.nr)) - goto out; - sp->splice_fd_in = array_index_nospec(sp->splice_fd_in, ctx->file_table.data.nr); - node = ctx->file_table.data.nodes[sp->splice_fd_in]; + node = io_rsrc_node_lookup(&ctx->file_table.data, sp->splice_fd_in); if (node) { node->refs++; sp->rsrc_node = node; file = io_slot_file(node); req->flags |= REQ_F_NEED_CLEANUP; } -out: io_ring_submit_unlock(ctx, issue_flags); return file; } diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 17d5f5004702..535909a38e76 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -209,18 +209,17 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) if (ioucmd->flags & IORING_URING_CMD_FIXED) { struct io_ring_ctx *ctx = req->ctx; - u16 index; + struct io_rsrc_node *node; - index = READ_ONCE(sqe->buf_index); - if (unlikely(index >= ctx->buf_table.nr)) + node = io_rsrc_node_lookup(&ctx->buf_table, req->buf_index); + if (unlikely(!node)) return -EFAULT; - req->buf_index = array_index_nospec(index, ctx->buf_table.nr); /* * Pi node upfront, prior to io_uring_cmd_import_fixed() * being called. This prevents destruction of the mapped buffer * we'll need at actual import time. */ - io_req_assign_rsrc_node(req, ctx->buf_table.nodes[req->buf_index]); + io_req_assign_rsrc_node(req, node); } ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);

[11/14] io_uring/rsrc: add io_rsrc_node_lookup() helper

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