diff options
Diffstat (limited to '')
| -rw-r--r-- | io_uring/rsrc.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h new file mode 100644 index 000000000..acaf8dad0 --- /dev/null +++ b/io_uring/rsrc.h @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef IOU_RSRC_H +#define IOU_RSRC_H + +#include <net/af_unix.h> + +#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) +#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) +#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) + +enum { + IORING_RSRC_FILE = 0, + IORING_RSRC_BUFFER = 1, +}; + +struct io_rsrc_put { + struct list_head list; + u64 tag; + union { + void *rsrc; + struct file *file; + struct io_mapped_ubuf *buf; + }; +}; + +typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); + +struct io_rsrc_data { + struct io_ring_ctx *ctx; + + u64 **tags; + unsigned int nr; + rsrc_put_fn *do_put; + atomic_t refs; + struct completion done; + bool quiesce; +}; + +struct io_rsrc_node { + struct percpu_ref refs; + struct list_head node; + struct list_head rsrc_list; + struct io_rsrc_data *rsrc_data; + struct llist_node llist; + bool done; +}; + +struct io_mapped_ubuf { + u64 ubuf; + u64 ubuf_end; + unsigned int nr_bvecs; + unsigned long acct_pages; + struct bio_vec bvec[]; +}; + +void io_rsrc_put_work(struct work_struct *work); +void io_rsrc_refs_refill(struct io_ring_ctx *ctx); +void io_wait_rsrc_data(struct io_rsrc_data *data); +void io_rsrc_node_destroy(struct io_rsrc_node *ref_node); +void io_rsrc_refs_drop(struct io_ring_ctx *ctx); +int io_rsrc_node_switch_start(struct io_ring_ctx *ctx); +int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, + struct io_rsrc_node *node, void *rsrc); +void io_rsrc_node_switch(struct io_ring_ctx *ctx, + struct io_rsrc_data *data_to_kill); + +int io_import_fixed(int ddir, struct iov_iter *iter, + struct io_mapped_ubuf *imu, + u64 buf_addr, size_t len); + +void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); +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); +void __io_sqe_files_unregister(struct io_ring_ctx *ctx); +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_scm_file_account(struct io_ring_ctx *ctx, struct file *file); + +static inline bool io_file_need_scm(struct file *filp) +{ + return false; +} + +static inline int io_scm_file_account(struct io_ring_ctx *ctx, + struct file *file) +{ + if (likely(!io_file_need_scm(file))) + return 0; + return __io_scm_file_account(ctx, file); +} + +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); + +static inline void io_rsrc_put_node(struct io_rsrc_node *node, int nr) +{ + percpu_ref_put_many(&node->refs, nr); +} + +static inline void io_req_put_rsrc(struct io_kiocb *req) +{ + if (req->rsrc_node) + io_rsrc_put_node(req->rsrc_node, 1); +} + +static inline void io_req_put_rsrc_locked(struct io_kiocb *req, + struct io_ring_ctx *ctx) + __must_hold(&ctx->uring_lock) +{ + struct io_rsrc_node *node = req->rsrc_node; + + if (node) { + if (node == ctx->rsrc_node) + ctx->rsrc_cached_refs++; + else + io_rsrc_put_node(node, 1); + } +} + +static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx) +{ + ctx->rsrc_cached_refs--; + if (unlikely(ctx->rsrc_cached_refs < 0)) + io_rsrc_refs_refill(ctx); +} + +static inline void io_req_set_rsrc_node(struct io_kiocb *req, + struct io_ring_ctx *ctx, + unsigned int issue_flags) +{ + if (!req->rsrc_node) { + io_ring_submit_lock(ctx, issue_flags); + + lockdep_assert_held(&ctx->uring_lock); + + req->rsrc_node = ctx->rsrc_node; + io_charge_rsrc_node(ctx); + io_ring_submit_unlock(ctx, issue_flags); + } +} + +static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) +{ + unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; + unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; + + return &data->tags[table_idx][off]; +} + +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); + +static inline void __io_unaccount_mem(struct user_struct *user, + unsigned long nr_pages) +{ + atomic_long_sub(nr_pages, &user->locked_vm); +} + +#endif |