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-rw-r--r--io_uring/rsrc.h168
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