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// 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_tw(struct callback_head *cb);
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);
#if defined(CONFIG_UNIX)
static inline bool io_file_need_scm(struct file *filp)
{
return !!unix_get_socket(filp);
}
#else
static inline bool io_file_need_scm(struct file *filp)
{
return false;
}
#endif
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) {
req->rsrc_node = ctx->rsrc_node;
if (!(issue_flags & IO_URING_F_UNLOCKED)) {
lockdep_assert_held(&ctx->uring_lock);
io_charge_rsrc_node(ctx);
} else {
percpu_ref_get(&req->rsrc_node->refs);
}
}
}
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
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