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io_uring: modularize io_sqe_buffer_register
Split io_sqe_buffer_register into two routines: - io_sqe_buffer_register() registers a single buffer - io_sqe_buffers_register iterates over all user specified buffers Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bijan Mottahedeh
Jens Axboe
parent
3a81fd0204
commit
0a96bbe499
210
fs/io_uring.c
210
fs/io_uring.c
@ -8370,7 +8370,7 @@ static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries)
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return pages;
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}
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static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx)
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static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
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{
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int i, j;
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@ -8488,14 +8488,103 @@ static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages,
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return ret;
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}
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static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
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unsigned nr_args)
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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 *imu,
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struct page **last_hpage)
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{
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struct vm_area_struct **vmas = NULL;
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struct page **pages = NULL;
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unsigned long off, start, end, ubuf;
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size_t size;
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int ret, pret, nr_pages, i;
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ubuf = (unsigned long) iov->iov_base;
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end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
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start = ubuf >> PAGE_SHIFT;
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nr_pages = end - start;
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ret = -ENOMEM;
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pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL);
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if (!pages)
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goto done;
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vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *),
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GFP_KERNEL);
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if (!vmas)
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goto done;
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imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec),
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GFP_KERNEL);
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if (!imu->bvec)
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goto done;
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ret = 0;
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mmap_read_lock(current->mm);
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pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM,
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pages, vmas);
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if (pret == nr_pages) {
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/* don't support file backed memory */
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for (i = 0; i < nr_pages; i++) {
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struct vm_area_struct *vma = vmas[i];
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if (vma->vm_file &&
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!is_file_hugepages(vma->vm_file)) {
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ret = -EOPNOTSUPP;
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break;
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}
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}
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} else {
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ret = pret < 0 ? pret : -EFAULT;
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}
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mmap_read_unlock(current->mm);
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if (ret) {
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/*
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* if we did partial map, or found file backed vmas,
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* release any pages we did get
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*/
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if (pret > 0)
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unpin_user_pages(pages, pret);
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kvfree(imu->bvec);
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goto done;
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}
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ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage);
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if (ret) {
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unpin_user_pages(pages, pret);
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kvfree(imu->bvec);
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goto done;
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}
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off = ubuf & ~PAGE_MASK;
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size = iov->iov_len;
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for (i = 0; i < nr_pages; i++) {
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size_t vec_len;
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vec_len = min_t(size_t, size, PAGE_SIZE - off);
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imu->bvec[i].bv_page = pages[i];
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imu->bvec[i].bv_len = vec_len;
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imu->bvec[i].bv_offset = off;
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off = 0;
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size -= vec_len;
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}
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/* store original address for later verification */
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imu->ubuf = ubuf;
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imu->len = iov->iov_len;
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imu->nr_bvecs = nr_pages;
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ret = 0;
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done:
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kvfree(pages);
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kvfree(vmas);
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return ret;
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}
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static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
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unsigned int nr_args)
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{
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int i, ret;
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struct iovec iov;
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struct page *last_hpage = NULL;
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int i, j, got_pages = 0;
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int ret = -EINVAL;
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if (ctx->user_bufs)
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return -EBUSY;
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@ -8509,14 +8598,10 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
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for (i = 0; i < nr_args; i++) {
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struct io_mapped_ubuf *imu = &ctx->user_bufs[i];
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unsigned long off, start, end, ubuf;
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int pret, nr_pages;
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struct iovec iov;
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size_t size;
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ret = io_copy_iov(ctx, &iov, arg, i);
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if (ret)
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goto err;
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break;
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/*
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* Don't impose further limits on the size and buffer
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@ -8525,103 +8610,22 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
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*/
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ret = -EFAULT;
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if (!iov.iov_base || !iov.iov_len)
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goto err;
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break;
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/* arbitrary limit, but we need something */
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if (iov.iov_len > SZ_1G)
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goto err;
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break;
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ubuf = (unsigned long) iov.iov_base;
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end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
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start = ubuf >> PAGE_SHIFT;
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nr_pages = end - start;
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ret = 0;
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if (!pages || nr_pages > got_pages) {
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kvfree(vmas);
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kvfree(pages);
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pages = kvmalloc_array(nr_pages, sizeof(struct page *),
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GFP_KERNEL);
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vmas = kvmalloc_array(nr_pages,
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sizeof(struct vm_area_struct *),
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GFP_KERNEL);
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if (!pages || !vmas) {
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ret = -ENOMEM;
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goto err;
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}
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got_pages = nr_pages;
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}
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imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec),
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GFP_KERNEL);
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ret = -ENOMEM;
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if (!imu->bvec)
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goto err;
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ret = 0;
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mmap_read_lock(current->mm);
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pret = pin_user_pages(ubuf, nr_pages,
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FOLL_WRITE | FOLL_LONGTERM,
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pages, vmas);
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if (pret == nr_pages) {
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/* don't support file backed memory */
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for (j = 0; j < nr_pages; j++) {
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struct vm_area_struct *vma = vmas[j];
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if (vma->vm_file &&
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!is_file_hugepages(vma->vm_file)) {
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ret = -EOPNOTSUPP;
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break;
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}
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}
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} else {
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ret = pret < 0 ? pret : -EFAULT;
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}
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mmap_read_unlock(current->mm);
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if (ret) {
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/*
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* if we did partial map, or found file backed vmas,
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* release any pages we did get
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*/
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if (pret > 0)
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unpin_user_pages(pages, pret);
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kvfree(imu->bvec);
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goto err;
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}
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ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage);
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if (ret) {
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unpin_user_pages(pages, pret);
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kvfree(imu->bvec);
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goto err;
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}
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off = ubuf & ~PAGE_MASK;
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size = iov.iov_len;
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for (j = 0; j < nr_pages; j++) {
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size_t vec_len;
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vec_len = min_t(size_t, size, PAGE_SIZE - off);
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imu->bvec[j].bv_page = pages[j];
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imu->bvec[j].bv_len = vec_len;
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imu->bvec[j].bv_offset = off;
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off = 0;
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size -= vec_len;
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}
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/* store original address for later verification */
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imu->ubuf = ubuf;
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imu->len = iov.iov_len;
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imu->nr_bvecs = nr_pages;
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ret = io_sqe_buffer_register(ctx, &iov, imu, &last_hpage);
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if (ret)
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break;
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ctx->nr_user_bufs++;
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}
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kvfree(pages);
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kvfree(vmas);
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return 0;
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err:
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kvfree(pages);
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kvfree(vmas);
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io_sqe_buffer_unregister(ctx);
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if (ret)
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io_sqe_buffers_unregister(ctx);
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return ret;
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}
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@ -8675,7 +8679,7 @@ static void io_destroy_buffers(struct io_ring_ctx *ctx)
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static void io_ring_ctx_free(struct io_ring_ctx *ctx)
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{
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io_finish_async(ctx);
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io_sqe_buffer_unregister(ctx);
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io_sqe_buffers_unregister(ctx);
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if (ctx->sqo_task) {
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put_task_struct(ctx->sqo_task);
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@ -10057,13 +10061,13 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
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switch (opcode) {
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case IORING_REGISTER_BUFFERS:
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ret = io_sqe_buffer_register(ctx, arg, nr_args);
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ret = io_sqe_buffers_register(ctx, arg, nr_args);
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break;
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case IORING_UNREGISTER_BUFFERS:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_sqe_buffer_unregister(ctx);
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ret = io_sqe_buffers_unregister(ctx);
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break;
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case IORING_REGISTER_FILES:
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ret = io_sqe_files_register(ctx, arg, nr_args);
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