diff options
Diffstat (limited to 'io_uring/rsrc.h')
| -rw-r--r-- | io_uring/rsrc.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h new file mode 100644 index 000000000000..d603f6a47f5e --- /dev/null +++ b/io_uring/rsrc.h @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef IOU_RSRC_H +#define IOU_RSRC_H + +#include <linux/io_uring_types.h> +#include <linux/lockdep.h> + +#define IO_VEC_CACHE_SOFT_CAP 256 + +enum { + IORING_RSRC_FILE = 0, + IORING_RSRC_BUFFER = 1, +}; + +struct io_rsrc_node { + unsigned char type; + int refs; + + u64 tag; + union { + unsigned long file_ptr; + struct io_mapped_ubuf *buf; + }; +}; + +enum { + IO_IMU_DEST = 1 << ITER_DEST, + IO_IMU_SOURCE = 1 << ITER_SOURCE, +}; + +struct io_mapped_ubuf { + u64 ubuf; + unsigned int len; + unsigned int nr_bvecs; + unsigned int folio_shift; + refcount_t refs; + unsigned long acct_pages; + void (*release)(void *); + void *priv; + bool is_kbuf; + u8 dir; + struct bio_vec bvec[] __counted_by(nr_bvecs); +}; + +struct io_imu_folio_data { + /* Head folio can be partially included in the fixed buf */ + unsigned int nr_pages_head; + /* For non-head/tail folios, has to be fully included */ + unsigned int nr_pages_mid; + unsigned int folio_shift; + unsigned int nr_folios; + unsigned long first_folio_page_idx; +}; + +bool io_rsrc_cache_init(struct io_ring_ctx *ctx); +void io_rsrc_cache_free(struct io_ring_ctx *ctx); +struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type); +void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node); +void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data); +int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr); + +struct io_rsrc_node *io_find_buf_node(struct io_kiocb *req, + unsigned issue_flags); +int io_import_reg_buf(struct io_kiocb *req, struct iov_iter *iter, + u64 buf_addr, size_t len, int ddir, + unsigned issue_flags); +int io_import_reg_vec(int ddir, struct iov_iter *iter, + struct io_kiocb *req, struct iou_vec *vec, + unsigned nr_iovs, unsigned issue_flags); +int io_prep_reg_iovec(struct io_kiocb *req, struct iou_vec *iv, + const struct iovec __user *uvec, size_t uvec_segs); + +int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg); +int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); +int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, + unsigned int nr_args, u64 __user *tags); +int io_sqe_files_unregister(struct io_ring_ctx *ctx); +int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, + unsigned nr_args, u64 __user *tags); + +int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, + unsigned nr_args); +int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, + unsigned size, unsigned type); +int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, + unsigned int size, unsigned int type); +int io_validate_user_buf_range(u64 uaddr, u64 ulen); + +bool io_check_coalesce_buffer(struct page **page_array, int nr_pages, + struct io_imu_folio_data *data); + +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_ring_ctx *ctx, struct io_rsrc_node *node) +{ + lockdep_assert_held(&ctx->uring_lock); + if (!--node->refs) + io_free_rsrc_node(ctx, node); +} + +static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx, + struct io_rsrc_data *data, int index) +{ + struct io_rsrc_node *node = data->nodes[index]; + + if (!node) + return false; + io_put_rsrc_node(ctx, node); + data->nodes[index] = NULL; + return true; +} + +int io_files_update(struct io_kiocb *req, unsigned int issue_flags); +int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); + +int __io_account_mem(struct user_struct *user, unsigned long nr_pages); +int io_account_mem(struct user_struct *user, struct mm_struct *mm_account, + unsigned long nr_pages); +void io_unaccount_mem(struct user_struct *user, struct mm_struct *mm_account, + unsigned long nr_pages); + +static inline void __io_unaccount_mem(struct user_struct *user, + unsigned long nr_pages) +{ + atomic_long_sub(nr_pages, &user->locked_vm); +} + +void io_vec_free(struct iou_vec *iv); +int io_vec_realloc(struct iou_vec *iv, unsigned nr_entries); + +static inline void io_vec_reset_iovec(struct iou_vec *iv, + struct iovec *iovec, unsigned nr) +{ + io_vec_free(iv); + iv->iovec = iovec; + iv->nr = nr; +} + +static inline void io_alloc_cache_vec_kasan(struct iou_vec *iv) +{ + if (IS_ENABLED(CONFIG_KASAN)) + io_vec_free(iv); +} + +#endif |