mirror of
https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
![Jens Axboe](/assets/img/avatar_default.png)
Move the related code from io_uring.c into memmap.c. No functional changes in this patch, just cleaning it up a bit now that the full transition is done. Signed-off-by: Jens Axboe <axboe@kernel.dk>
1089 lines
25 KiB
C
1089 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/nospec.h>
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#include <linux/hugetlb.h>
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#include <linux/compat.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "alloc_cache.h"
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#include "openclose.h"
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#include "rsrc.h"
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#include "memmap.h"
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struct io_rsrc_update {
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struct file *file;
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u64 arg;
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u32 nr_args;
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u32 offset;
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};
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static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
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static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
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struct io_mapped_ubuf **pimu,
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struct page **last_hpage);
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/* only define max */
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#define IORING_MAX_FIXED_FILES (1U << 20)
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#define IORING_MAX_REG_BUFFERS (1U << 14)
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static const struct io_mapped_ubuf dummy_ubuf = {
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/* set invalid range, so io_import_fixed() fails meeting it */
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.ubuf = -1UL,
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.ubuf_end = 0,
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};
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int __io_account_mem(struct user_struct *user, unsigned long nr_pages)
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{
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unsigned long page_limit, cur_pages, new_pages;
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if (!nr_pages)
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return 0;
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/* Don't allow more pages than we can safely lock */
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page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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cur_pages = atomic_long_read(&user->locked_vm);
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do {
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new_pages = cur_pages + nr_pages;
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if (new_pages > page_limit)
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return -ENOMEM;
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} while (!atomic_long_try_cmpxchg(&user->locked_vm,
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&cur_pages, new_pages));
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return 0;
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}
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static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
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{
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if (ctx->user)
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__io_unaccount_mem(ctx->user, nr_pages);
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if (ctx->mm_account)
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atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm);
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}
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static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
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{
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int ret;
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if (ctx->user) {
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ret = __io_account_mem(ctx->user, nr_pages);
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if (ret)
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return ret;
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}
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if (ctx->mm_account)
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atomic64_add(nr_pages, &ctx->mm_account->pinned_vm);
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return 0;
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}
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static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst,
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void __user *arg, unsigned index)
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{
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struct iovec __user *src;
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#ifdef CONFIG_COMPAT
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if (ctx->compat) {
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struct compat_iovec __user *ciovs;
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struct compat_iovec ciov;
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ciovs = (struct compat_iovec __user *) arg;
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if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov)))
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return -EFAULT;
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dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base);
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dst->iov_len = ciov.iov_len;
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return 0;
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}
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#endif
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src = (struct iovec __user *) arg;
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if (copy_from_user(dst, &src[index], sizeof(*dst)))
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return -EFAULT;
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return 0;
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}
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static int io_buffer_validate(struct iovec *iov)
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{
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unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1);
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/*
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* Don't impose further limits on the size and buffer
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* constraints here, we'll -EINVAL later when IO is
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* submitted if they are wrong.
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*/
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if (!iov->iov_base)
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return iov->iov_len ? -EFAULT : 0;
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if (!iov->iov_len)
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return -EFAULT;
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/* arbitrary limit, but we need something */
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if (iov->iov_len > SZ_1G)
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return -EFAULT;
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if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp))
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return -EOVERFLOW;
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return 0;
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}
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static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot)
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{
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struct io_mapped_ubuf *imu = *slot;
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unsigned int i;
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if (imu != &dummy_ubuf) {
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for (i = 0; i < imu->nr_bvecs; i++)
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unpin_user_page(imu->bvec[i].bv_page);
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if (imu->acct_pages)
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io_unaccount_mem(ctx, imu->acct_pages);
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kvfree(imu);
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}
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*slot = NULL;
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}
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static void io_rsrc_put_work(struct io_rsrc_node *node)
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{
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struct io_rsrc_put *prsrc = &node->item;
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if (prsrc->tag)
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io_post_aux_cqe(node->ctx, prsrc->tag, 0, 0);
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switch (node->type) {
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case IORING_RSRC_FILE:
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fput(prsrc->file);
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break;
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case IORING_RSRC_BUFFER:
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io_rsrc_buf_put(node->ctx, prsrc);
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break;
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default:
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WARN_ON_ONCE(1);
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break;
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}
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}
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void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
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{
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if (!io_alloc_cache_put(&ctx->rsrc_node_cache, node))
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kfree(node);
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}
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void io_rsrc_node_ref_zero(struct io_rsrc_node *node)
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__must_hold(&node->ctx->uring_lock)
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{
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struct io_ring_ctx *ctx = node->ctx;
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while (!list_empty(&ctx->rsrc_ref_list)) {
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node = list_first_entry(&ctx->rsrc_ref_list,
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struct io_rsrc_node, node);
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/* recycle ref nodes in order */
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if (node->refs)
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break;
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list_del(&node->node);
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if (likely(!node->empty))
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io_rsrc_put_work(node);
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io_rsrc_node_destroy(ctx, node);
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}
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if (list_empty(&ctx->rsrc_ref_list) && unlikely(ctx->rsrc_quiesce))
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wake_up_all(&ctx->rsrc_quiesce_wq);
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}
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struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx)
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{
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struct io_rsrc_node *ref_node;
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ref_node = io_alloc_cache_get(&ctx->rsrc_node_cache);
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if (!ref_node) {
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ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL);
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if (!ref_node)
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return NULL;
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}
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ref_node->ctx = ctx;
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ref_node->empty = 0;
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ref_node->refs = 1;
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return ref_node;
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}
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__cold static int io_rsrc_ref_quiesce(struct io_rsrc_data *data,
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struct io_ring_ctx *ctx)
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{
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struct io_rsrc_node *backup;
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DEFINE_WAIT(we);
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int ret;
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/* As We may drop ->uring_lock, other task may have started quiesce */
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if (data->quiesce)
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return -ENXIO;
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backup = io_rsrc_node_alloc(ctx);
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if (!backup)
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return -ENOMEM;
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ctx->rsrc_node->empty = true;
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ctx->rsrc_node->type = -1;
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list_add_tail(&ctx->rsrc_node->node, &ctx->rsrc_ref_list);
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io_put_rsrc_node(ctx, ctx->rsrc_node);
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ctx->rsrc_node = backup;
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if (list_empty(&ctx->rsrc_ref_list))
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return 0;
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if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
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atomic_set(&ctx->cq_wait_nr, 1);
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smp_mb();
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}
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ctx->rsrc_quiesce++;
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data->quiesce = true;
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do {
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prepare_to_wait(&ctx->rsrc_quiesce_wq, &we, TASK_INTERRUPTIBLE);
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mutex_unlock(&ctx->uring_lock);
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ret = io_run_task_work_sig(ctx);
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if (ret < 0) {
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mutex_lock(&ctx->uring_lock);
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if (list_empty(&ctx->rsrc_ref_list))
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ret = 0;
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break;
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}
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schedule();
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__set_current_state(TASK_RUNNING);
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mutex_lock(&ctx->uring_lock);
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ret = 0;
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} while (!list_empty(&ctx->rsrc_ref_list));
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finish_wait(&ctx->rsrc_quiesce_wq, &we);
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data->quiesce = false;
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ctx->rsrc_quiesce--;
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if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
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atomic_set(&ctx->cq_wait_nr, 0);
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smp_mb();
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}
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return ret;
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}
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static void io_free_page_table(void **table, size_t size)
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{
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unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE);
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for (i = 0; i < nr_tables; i++)
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kfree(table[i]);
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kfree(table);
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}
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static void io_rsrc_data_free(struct io_rsrc_data *data)
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{
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size_t size = data->nr * sizeof(data->tags[0][0]);
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if (data->tags)
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io_free_page_table((void **)data->tags, size);
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kfree(data);
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}
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static __cold void **io_alloc_page_table(size_t size)
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{
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unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE);
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size_t init_size = size;
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void **table;
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table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT);
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if (!table)
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return NULL;
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for (i = 0; i < nr_tables; i++) {
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unsigned int this_size = min_t(size_t, size, PAGE_SIZE);
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table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT);
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if (!table[i]) {
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io_free_page_table(table, init_size);
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return NULL;
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}
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size -= this_size;
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}
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return table;
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}
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__cold static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, int type,
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u64 __user *utags,
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unsigned nr, struct io_rsrc_data **pdata)
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{
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struct io_rsrc_data *data;
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int ret = 0;
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unsigned i;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0]));
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if (!data->tags) {
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kfree(data);
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return -ENOMEM;
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}
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data->nr = nr;
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data->ctx = ctx;
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data->rsrc_type = type;
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if (utags) {
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ret = -EFAULT;
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for (i = 0; i < nr; i++) {
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u64 *tag_slot = io_get_tag_slot(data, i);
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if (copy_from_user(tag_slot, &utags[i],
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sizeof(*tag_slot)))
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goto fail;
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}
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}
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*pdata = data;
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return 0;
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fail:
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io_rsrc_data_free(data);
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return ret;
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}
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static int __io_sqe_files_update(struct io_ring_ctx *ctx,
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struct io_uring_rsrc_update2 *up,
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unsigned nr_args)
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{
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u64 __user *tags = u64_to_user_ptr(up->tags);
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__s32 __user *fds = u64_to_user_ptr(up->data);
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struct io_rsrc_data *data = ctx->file_data;
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struct io_fixed_file *file_slot;
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int fd, i, err = 0;
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unsigned int done;
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if (!ctx->file_data)
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return -ENXIO;
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if (up->offset + nr_args > ctx->nr_user_files)
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return -EINVAL;
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for (done = 0; done < nr_args; done++) {
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u64 tag = 0;
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if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) ||
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copy_from_user(&fd, &fds[done], sizeof(fd))) {
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err = -EFAULT;
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break;
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}
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if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) {
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err = -EINVAL;
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break;
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}
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if (fd == IORING_REGISTER_FILES_SKIP)
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continue;
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i = array_index_nospec(up->offset + done, ctx->nr_user_files);
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file_slot = io_fixed_file_slot(&ctx->file_table, i);
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if (file_slot->file_ptr) {
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err = io_queue_rsrc_removal(data, i,
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io_slot_file(file_slot));
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if (err)
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break;
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file_slot->file_ptr = 0;
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io_file_bitmap_clear(&ctx->file_table, i);
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}
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if (fd != -1) {
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struct file *file = fget(fd);
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if (!file) {
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err = -EBADF;
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break;
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}
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/*
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* Don't allow io_uring instances to be registered.
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*/
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if (io_is_uring_fops(file)) {
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fput(file);
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err = -EBADF;
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break;
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}
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*io_get_tag_slot(data, i) = tag;
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io_fixed_file_set(file_slot, file);
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io_file_bitmap_set(&ctx->file_table, i);
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}
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}
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return done ? done : err;
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}
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static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
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struct io_uring_rsrc_update2 *up,
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unsigned int nr_args)
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{
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u64 __user *tags = u64_to_user_ptr(up->tags);
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struct iovec iov, __user *iovs = u64_to_user_ptr(up->data);
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struct page *last_hpage = NULL;
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__u32 done;
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int i, err;
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if (!ctx->buf_data)
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return -ENXIO;
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if (up->offset + nr_args > ctx->nr_user_bufs)
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return -EINVAL;
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for (done = 0; done < nr_args; done++) {
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struct io_mapped_ubuf *imu;
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u64 tag = 0;
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err = io_copy_iov(ctx, &iov, iovs, done);
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if (err)
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break;
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if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) {
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err = -EFAULT;
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break;
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}
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err = io_buffer_validate(&iov);
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if (err)
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break;
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if (!iov.iov_base && tag) {
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err = -EINVAL;
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break;
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}
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err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage);
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if (err)
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break;
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i = array_index_nospec(up->offset + done, ctx->nr_user_bufs);
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if (ctx->user_bufs[i] != &dummy_ubuf) {
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err = io_queue_rsrc_removal(ctx->buf_data, i,
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ctx->user_bufs[i]);
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if (unlikely(err)) {
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io_buffer_unmap(ctx, &imu);
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break;
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}
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ctx->user_bufs[i] = (struct io_mapped_ubuf *)&dummy_ubuf;
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}
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ctx->user_bufs[i] = imu;
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*io_get_tag_slot(ctx->buf_data, i) = tag;
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}
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return done ? done : err;
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}
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static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
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struct io_uring_rsrc_update2 *up,
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unsigned nr_args)
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{
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__u32 tmp;
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lockdep_assert_held(&ctx->uring_lock);
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if (check_add_overflow(up->offset, nr_args, &tmp))
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return -EOVERFLOW;
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switch (type) {
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case IORING_RSRC_FILE:
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return __io_sqe_files_update(ctx, up, nr_args);
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case IORING_RSRC_BUFFER:
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return __io_sqe_buffers_update(ctx, up, nr_args);
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}
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return -EINVAL;
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}
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int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
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unsigned nr_args)
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{
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struct io_uring_rsrc_update2 up;
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if (!nr_args)
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return -EINVAL;
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memset(&up, 0, sizeof(up));
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if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update)))
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return -EFAULT;
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if (up.resv || up.resv2)
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return -EINVAL;
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return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args);
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}
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|
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int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
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unsigned size, unsigned type)
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{
|
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struct io_uring_rsrc_update2 up;
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|
|
|
if (size != sizeof(up))
|
|
return -EINVAL;
|
|
if (copy_from_user(&up, arg, sizeof(up)))
|
|
return -EFAULT;
|
|
if (!up.nr || up.resv || up.resv2)
|
|
return -EINVAL;
|
|
return __io_register_rsrc_update(ctx, type, &up, up.nr);
|
|
}
|
|
|
|
__cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
|
|
unsigned int size, unsigned int type)
|
|
{
|
|
struct io_uring_rsrc_register rr;
|
|
|
|
/* keep it extendible */
|
|
if (size != sizeof(rr))
|
|
return -EINVAL;
|
|
|
|
memset(&rr, 0, sizeof(rr));
|
|
if (copy_from_user(&rr, arg, size))
|
|
return -EFAULT;
|
|
if (!rr.nr || rr.resv2)
|
|
return -EINVAL;
|
|
if (rr.flags & ~IORING_RSRC_REGISTER_SPARSE)
|
|
return -EINVAL;
|
|
|
|
switch (type) {
|
|
case IORING_RSRC_FILE:
|
|
if (rr.flags & IORING_RSRC_REGISTER_SPARSE && rr.data)
|
|
break;
|
|
return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data),
|
|
rr.nr, u64_to_user_ptr(rr.tags));
|
|
case IORING_RSRC_BUFFER:
|
|
if (rr.flags & IORING_RSRC_REGISTER_SPARSE && rr.data)
|
|
break;
|
|
return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data),
|
|
rr.nr, u64_to_user_ptr(rr.tags));
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_rsrc_update *up = io_kiocb_to_cmd(req, struct io_rsrc_update);
|
|
|
|
if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
|
|
return -EINVAL;
|
|
if (sqe->rw_flags || sqe->splice_fd_in)
|
|
return -EINVAL;
|
|
|
|
up->offset = READ_ONCE(sqe->off);
|
|
up->nr_args = READ_ONCE(sqe->len);
|
|
if (!up->nr_args)
|
|
return -EINVAL;
|
|
up->arg = READ_ONCE(sqe->addr);
|
|
return 0;
|
|
}
|
|
|
|
static int io_files_update_with_index_alloc(struct io_kiocb *req,
|
|
unsigned int issue_flags)
|
|
{
|
|
struct io_rsrc_update *up = io_kiocb_to_cmd(req, struct io_rsrc_update);
|
|
__s32 __user *fds = u64_to_user_ptr(up->arg);
|
|
unsigned int done;
|
|
struct file *file;
|
|
int ret, fd;
|
|
|
|
if (!req->ctx->file_data)
|
|
return -ENXIO;
|
|
|
|
for (done = 0; done < up->nr_args; done++) {
|
|
if (copy_from_user(&fd, &fds[done], sizeof(fd))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
file = fget(fd);
|
|
if (!file) {
|
|
ret = -EBADF;
|
|
break;
|
|
}
|
|
ret = io_fixed_fd_install(req, issue_flags, file,
|
|
IORING_FILE_INDEX_ALLOC);
|
|
if (ret < 0)
|
|
break;
|
|
if (copy_to_user(&fds[done], &ret, sizeof(ret))) {
|
|
__io_close_fixed(req->ctx, issue_flags, ret);
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (done)
|
|
return done;
|
|
return ret;
|
|
}
|
|
|
|
int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_rsrc_update *up = io_kiocb_to_cmd(req, struct io_rsrc_update);
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
struct io_uring_rsrc_update2 up2;
|
|
int ret;
|
|
|
|
up2.offset = up->offset;
|
|
up2.data = up->arg;
|
|
up2.nr = 0;
|
|
up2.tags = 0;
|
|
up2.resv = 0;
|
|
up2.resv2 = 0;
|
|
|
|
if (up->offset == IORING_FILE_INDEX_ALLOC) {
|
|
ret = io_files_update_with_index_alloc(req, issue_flags);
|
|
} else {
|
|
io_ring_submit_lock(ctx, issue_flags);
|
|
ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
|
|
&up2, up->nr_args);
|
|
io_ring_submit_unlock(ctx, issue_flags);
|
|
}
|
|
|
|
if (ret < 0)
|
|
req_set_fail(req);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc)
|
|
{
|
|
struct io_ring_ctx *ctx = data->ctx;
|
|
struct io_rsrc_node *node = ctx->rsrc_node;
|
|
u64 *tag_slot = io_get_tag_slot(data, idx);
|
|
|
|
ctx->rsrc_node = io_rsrc_node_alloc(ctx);
|
|
if (unlikely(!ctx->rsrc_node)) {
|
|
ctx->rsrc_node = node;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
node->item.rsrc = rsrc;
|
|
node->type = data->rsrc_type;
|
|
node->item.tag = *tag_slot;
|
|
*tag_slot = 0;
|
|
list_add_tail(&node->node, &ctx->rsrc_ref_list);
|
|
io_put_rsrc_node(ctx, node);
|
|
return 0;
|
|
}
|
|
|
|
void __io_sqe_files_unregister(struct io_ring_ctx *ctx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ctx->nr_user_files; i++) {
|
|
struct file *file = io_file_from_index(&ctx->file_table, i);
|
|
|
|
if (!file)
|
|
continue;
|
|
io_file_bitmap_clear(&ctx->file_table, i);
|
|
fput(file);
|
|
}
|
|
|
|
io_free_file_tables(&ctx->file_table);
|
|
io_file_table_set_alloc_range(ctx, 0, 0);
|
|
io_rsrc_data_free(ctx->file_data);
|
|
ctx->file_data = NULL;
|
|
ctx->nr_user_files = 0;
|
|
}
|
|
|
|
int io_sqe_files_unregister(struct io_ring_ctx *ctx)
|
|
{
|
|
unsigned nr = ctx->nr_user_files;
|
|
int ret;
|
|
|
|
if (!ctx->file_data)
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* Quiesce may unlock ->uring_lock, and while it's not held
|
|
* prevent new requests using the table.
|
|
*/
|
|
ctx->nr_user_files = 0;
|
|
ret = io_rsrc_ref_quiesce(ctx->file_data, ctx);
|
|
ctx->nr_user_files = nr;
|
|
if (!ret)
|
|
__io_sqe_files_unregister(ctx);
|
|
return ret;
|
|
}
|
|
|
|
int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
|
|
unsigned nr_args, u64 __user *tags)
|
|
{
|
|
__s32 __user *fds = (__s32 __user *) arg;
|
|
struct file *file;
|
|
int fd, ret;
|
|
unsigned i;
|
|
|
|
if (ctx->file_data)
|
|
return -EBUSY;
|
|
if (!nr_args)
|
|
return -EINVAL;
|
|
if (nr_args > IORING_MAX_FIXED_FILES)
|
|
return -EMFILE;
|
|
if (nr_args > rlimit(RLIMIT_NOFILE))
|
|
return -EMFILE;
|
|
ret = io_rsrc_data_alloc(ctx, IORING_RSRC_FILE, tags, nr_args,
|
|
&ctx->file_data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!io_alloc_file_tables(&ctx->file_table, nr_args)) {
|
|
io_rsrc_data_free(ctx->file_data);
|
|
ctx->file_data = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < nr_args; i++, ctx->nr_user_files++) {
|
|
struct io_fixed_file *file_slot;
|
|
|
|
if (fds && copy_from_user(&fd, &fds[i], sizeof(fd))) {
|
|
ret = -EFAULT;
|
|
goto fail;
|
|
}
|
|
/* allow sparse sets */
|
|
if (!fds || fd == -1) {
|
|
ret = -EINVAL;
|
|
if (unlikely(*io_get_tag_slot(ctx->file_data, i)))
|
|
goto fail;
|
|
continue;
|
|
}
|
|
|
|
file = fget(fd);
|
|
ret = -EBADF;
|
|
if (unlikely(!file))
|
|
goto fail;
|
|
|
|
/*
|
|
* Don't allow io_uring instances to be registered.
|
|
*/
|
|
if (io_is_uring_fops(file)) {
|
|
fput(file);
|
|
goto fail;
|
|
}
|
|
file_slot = io_fixed_file_slot(&ctx->file_table, i);
|
|
io_fixed_file_set(file_slot, file);
|
|
io_file_bitmap_set(&ctx->file_table, i);
|
|
}
|
|
|
|
/* default it to the whole table */
|
|
io_file_table_set_alloc_range(ctx, 0, ctx->nr_user_files);
|
|
return 0;
|
|
fail:
|
|
__io_sqe_files_unregister(ctx);
|
|
return ret;
|
|
}
|
|
|
|
static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc)
|
|
{
|
|
io_buffer_unmap(ctx, &prsrc->buf);
|
|
prsrc->buf = NULL;
|
|
}
|
|
|
|
void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ctx->nr_user_bufs; i++)
|
|
io_buffer_unmap(ctx, &ctx->user_bufs[i]);
|
|
kfree(ctx->user_bufs);
|
|
io_rsrc_data_free(ctx->buf_data);
|
|
ctx->user_bufs = NULL;
|
|
ctx->buf_data = NULL;
|
|
ctx->nr_user_bufs = 0;
|
|
}
|
|
|
|
int io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
|
|
{
|
|
unsigned nr = ctx->nr_user_bufs;
|
|
int ret;
|
|
|
|
if (!ctx->buf_data)
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* Quiesce may unlock ->uring_lock, and while it's not held
|
|
* prevent new requests using the table.
|
|
*/
|
|
ctx->nr_user_bufs = 0;
|
|
ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx);
|
|
ctx->nr_user_bufs = nr;
|
|
if (!ret)
|
|
__io_sqe_buffers_unregister(ctx);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Not super efficient, but this is just a registration time. And we do cache
|
|
* the last compound head, so generally we'll only do a full search if we don't
|
|
* match that one.
|
|
*
|
|
* We check if the given compound head page has already been accounted, to
|
|
* avoid double accounting it. This allows us to account the full size of the
|
|
* page, not just the constituent pages of a huge page.
|
|
*/
|
|
static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages,
|
|
int nr_pages, struct page *hpage)
|
|
{
|
|
int i, j;
|
|
|
|
/* check current page array */
|
|
for (i = 0; i < nr_pages; i++) {
|
|
if (!PageCompound(pages[i]))
|
|
continue;
|
|
if (compound_head(pages[i]) == hpage)
|
|
return true;
|
|
}
|
|
|
|
/* check previously registered pages */
|
|
for (i = 0; i < ctx->nr_user_bufs; i++) {
|
|
struct io_mapped_ubuf *imu = ctx->user_bufs[i];
|
|
|
|
for (j = 0; j < imu->nr_bvecs; j++) {
|
|
if (!PageCompound(imu->bvec[j].bv_page))
|
|
continue;
|
|
if (compound_head(imu->bvec[j].bv_page) == hpage)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages,
|
|
int nr_pages, struct io_mapped_ubuf *imu,
|
|
struct page **last_hpage)
|
|
{
|
|
int i, ret;
|
|
|
|
imu->acct_pages = 0;
|
|
for (i = 0; i < nr_pages; i++) {
|
|
if (!PageCompound(pages[i])) {
|
|
imu->acct_pages++;
|
|
} else {
|
|
struct page *hpage;
|
|
|
|
hpage = compound_head(pages[i]);
|
|
if (hpage == *last_hpage)
|
|
continue;
|
|
*last_hpage = hpage;
|
|
if (headpage_already_acct(ctx, pages, i, hpage))
|
|
continue;
|
|
imu->acct_pages += page_size(hpage) >> PAGE_SHIFT;
|
|
}
|
|
}
|
|
|
|
if (!imu->acct_pages)
|
|
return 0;
|
|
|
|
ret = io_account_mem(ctx, imu->acct_pages);
|
|
if (ret)
|
|
imu->acct_pages = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
|
|
struct io_mapped_ubuf **pimu,
|
|
struct page **last_hpage)
|
|
{
|
|
struct io_mapped_ubuf *imu = NULL;
|
|
struct page **pages = NULL;
|
|
unsigned long off;
|
|
size_t size;
|
|
int ret, nr_pages, i;
|
|
struct folio *folio = NULL;
|
|
|
|
*pimu = (struct io_mapped_ubuf *)&dummy_ubuf;
|
|
if (!iov->iov_base)
|
|
return 0;
|
|
|
|
ret = -ENOMEM;
|
|
pages = io_pin_pages((unsigned long) iov->iov_base, iov->iov_len,
|
|
&nr_pages);
|
|
if (IS_ERR(pages)) {
|
|
ret = PTR_ERR(pages);
|
|
pages = NULL;
|
|
goto done;
|
|
}
|
|
|
|
/* If it's a huge page, try to coalesce them into a single bvec entry */
|
|
if (nr_pages > 1) {
|
|
folio = page_folio(pages[0]);
|
|
for (i = 1; i < nr_pages; i++) {
|
|
/*
|
|
* Pages must be consecutive and on the same folio for
|
|
* this to work
|
|
*/
|
|
if (page_folio(pages[i]) != folio ||
|
|
pages[i] != pages[i - 1] + 1) {
|
|
folio = NULL;
|
|
break;
|
|
}
|
|
}
|
|
if (folio) {
|
|
/*
|
|
* The pages are bound to the folio, it doesn't
|
|
* actually unpin them but drops all but one reference,
|
|
* which is usually put down by io_buffer_unmap().
|
|
* Note, needs a better helper.
|
|
*/
|
|
unpin_user_pages(&pages[1], nr_pages - 1);
|
|
nr_pages = 1;
|
|
}
|
|
}
|
|
|
|
imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL);
|
|
if (!imu)
|
|
goto done;
|
|
|
|
ret = io_buffer_account_pin(ctx, pages, nr_pages, imu, last_hpage);
|
|
if (ret) {
|
|
unpin_user_pages(pages, nr_pages);
|
|
goto done;
|
|
}
|
|
|
|
off = (unsigned long) iov->iov_base & ~PAGE_MASK;
|
|
size = iov->iov_len;
|
|
/* store original address for later verification */
|
|
imu->ubuf = (unsigned long) iov->iov_base;
|
|
imu->ubuf_end = imu->ubuf + iov->iov_len;
|
|
imu->nr_bvecs = nr_pages;
|
|
*pimu = imu;
|
|
ret = 0;
|
|
|
|
if (folio) {
|
|
bvec_set_page(&imu->bvec[0], pages[0], size, off);
|
|
goto done;
|
|
}
|
|
for (i = 0; i < nr_pages; i++) {
|
|
size_t vec_len;
|
|
|
|
vec_len = min_t(size_t, size, PAGE_SIZE - off);
|
|
bvec_set_page(&imu->bvec[i], pages[i], vec_len, off);
|
|
off = 0;
|
|
size -= vec_len;
|
|
}
|
|
done:
|
|
if (ret)
|
|
kvfree(imu);
|
|
kvfree(pages);
|
|
return ret;
|
|
}
|
|
|
|
static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args)
|
|
{
|
|
ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL);
|
|
return ctx->user_bufs ? 0 : -ENOMEM;
|
|
}
|
|
|
|
int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
|
|
unsigned int nr_args, u64 __user *tags)
|
|
{
|
|
struct page *last_hpage = NULL;
|
|
struct io_rsrc_data *data;
|
|
int i, ret;
|
|
struct iovec iov;
|
|
|
|
BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16));
|
|
|
|
if (ctx->user_bufs)
|
|
return -EBUSY;
|
|
if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS)
|
|
return -EINVAL;
|
|
ret = io_rsrc_data_alloc(ctx, IORING_RSRC_BUFFER, tags, nr_args, &data);
|
|
if (ret)
|
|
return ret;
|
|
ret = io_buffers_map_alloc(ctx, nr_args);
|
|
if (ret) {
|
|
io_rsrc_data_free(data);
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) {
|
|
if (arg) {
|
|
ret = io_copy_iov(ctx, &iov, arg, i);
|
|
if (ret)
|
|
break;
|
|
ret = io_buffer_validate(&iov);
|
|
if (ret)
|
|
break;
|
|
} else {
|
|
memset(&iov, 0, sizeof(iov));
|
|
}
|
|
|
|
if (!iov.iov_base && *io_get_tag_slot(data, i)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
|
|
&last_hpage);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
WARN_ON_ONCE(ctx->buf_data);
|
|
|
|
ctx->buf_data = data;
|
|
if (ret)
|
|
__io_sqe_buffers_unregister(ctx);
|
|
return ret;
|
|
}
|
|
|
|
int io_import_fixed(int ddir, struct iov_iter *iter,
|
|
struct io_mapped_ubuf *imu,
|
|
u64 buf_addr, size_t len)
|
|
{
|
|
u64 buf_end;
|
|
size_t offset;
|
|
|
|
if (WARN_ON_ONCE(!imu))
|
|
return -EFAULT;
|
|
if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end)))
|
|
return -EFAULT;
|
|
/* not inside the mapped region */
|
|
if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end))
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Might not be a start of buffer, set size appropriately
|
|
* and advance us to the beginning.
|
|
*/
|
|
offset = buf_addr - imu->ubuf;
|
|
iov_iter_bvec(iter, ddir, imu->bvec, imu->nr_bvecs, offset + len);
|
|
|
|
if (offset) {
|
|
/*
|
|
* Don't use iov_iter_advance() here, as it's really slow for
|
|
* using the latter parts of a big fixed buffer - it iterates
|
|
* over each segment manually. We can cheat a bit here, because
|
|
* we know that:
|
|
*
|
|
* 1) it's a BVEC iter, we set it up
|
|
* 2) all bvecs are PAGE_SIZE in size, except potentially the
|
|
* first and last bvec
|
|
*
|
|
* So just find our index, and adjust the iterator afterwards.
|
|
* If the offset is within the first bvec (or the whole first
|
|
* bvec, just use iov_iter_advance(). This makes it easier
|
|
* since we can just skip the first segment, which may not
|
|
* be PAGE_SIZE aligned.
|
|
*/
|
|
const struct bio_vec *bvec = imu->bvec;
|
|
|
|
if (offset < bvec->bv_len) {
|
|
/*
|
|
* Note, huge pages buffers consists of one large
|
|
* bvec entry and should always go this way. The other
|
|
* branch doesn't expect non PAGE_SIZE'd chunks.
|
|
*/
|
|
iter->bvec = bvec;
|
|
iter->nr_segs = bvec->bv_len;
|
|
iter->count -= offset;
|
|
iter->iov_offset = offset;
|
|
} else {
|
|
unsigned long seg_skip;
|
|
|
|
/* skip first vec */
|
|
offset -= bvec->bv_len;
|
|
seg_skip = 1 + (offset >> PAGE_SHIFT);
|
|
|
|
iter->bvec = bvec + seg_skip;
|
|
iter->nr_segs -= seg_skip;
|
|
iter->count -= bvec->bv_len + offset;
|
|
iter->iov_offset = offset & ~PAGE_MASK;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|