[linux-block.git] / io_uring / rsrc.h

// SPDX-License-Identifier: GPL-2.0
#ifndef IOU_RSRC_H
#define IOU_RSRC_H

#include <net/af_unix.h>

#include "alloc_cache.h"

#define IO_NODE_ALLOC_CACHE_MAX 32

#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 {
	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;
	u16				rsrc_type;
	bool				quiesce;
};

struct io_rsrc_node {
	union {
		struct io_cache_entry		cache;
		struct io_ring_ctx		*ctx;
	};
	int				refs;
	bool				empty;
	u16				type;
	struct list_head		node;
	struct io_rsrc_put		item;
};

struct io_mapped_ubuf {
	u64		ubuf;
	u64		ubuf_end;
	unsigned int	nr_bvecs;
	unsigned long	acct_pages;
	struct bio_vec	bvec[] __counted_by(nr_bvecs);
};

void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);

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_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_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
{
	lockdep_assert_held(&ctx->uring_lock);

	if (node && !--node->refs)
		io_rsrc_node_ref_zero(node);
}

static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
					  struct io_ring_ctx *ctx)
{
	io_put_rsrc_node(ctx, req->rsrc_node);
}

static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
				       struct io_rsrc_node *node)
{
	node->refs++;
}

static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
					  struct io_ring_ctx *ctx)
{
	lockdep_assert_held(&ctx->uring_lock);
	req->rsrc_node = ctx->rsrc_node;
	io_charge_rsrc_node(ctx, ctx->rsrc_node);
}

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);
		__io_req_set_rsrc_node(req, 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];
}

static inline int io_rsrc_init(struct io_ring_ctx *ctx)
{
	ctx->rsrc_node = io_rsrc_node_alloc(ctx);
	return ctx->rsrc_node ? 0 : -ENOMEM;
}

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
Commit	Line	Data
73572984 JA	1	// SPDX-License-Identifier: GPL-2.0
	2	#ifndef IOU_RSRC_H
	3	#define IOU_RSRC_H
	4
	5	#include <net/af_unix.h>
	6
9eae8655 PB	7	#include "alloc_cache.h"
9eae8655 PB	8
69bbc6ad PB	9	#define IO_NODE_ALLOC_CACHE_MAX 32
69bbc6ad PB	10
73572984 JA	11	#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
	12	#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
	13	#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
	14
	15	enum {
	16	IORING_RSRC_FILE = 0,
	17	IORING_RSRC_BUFFER = 1,
	18	};
	19
	20	struct io_rsrc_put {
73572984 JA	21	u64 tag;
	22	union {
	23	void *rsrc;
	24	struct file *file;
	25	struct io_mapped_ubuf *buf;
	26	};
	27	};
	28
	29	typedef void (rsrc_put_fn)(struct io_ring_ctx ctx, struct io_rsrc_put prsrc);
	30
	31	struct io_rsrc_data {
	32	struct io_ring_ctx *ctx;
	33
	34	u64 **tags;
	35	unsigned int nr;
fc7f3a8d	36	u16 rsrc_type;
73572984 JA	37	bool quiesce;
	38	};
	39
	40	struct io_rsrc_node {
9eae8655 PB	41	union {
9eae8655 PB	42	struct io_cache_entry cache;
2236b390	43	struct io_ring_ctx *ctx;
9eae8655	44	};
ef8ae64f	45	int refs;
26147da3	46	bool empty;
2236b390	47	u16 type;
c376644f PB	48	struct list_head node;
c376644f PB	49	struct io_rsrc_put item;
73572984 JA	50	};
73572984 JA	51
ad163a7e JA	52	struct io_mapped_ubuf {
	53	u64 ubuf;
	54	u64 ubuf_end;
	55	unsigned int nr_bvecs;
	56	unsigned long acct_pages;
04d9244c	57	struct bio_vec bvec[] __counted_by(nr_bvecs);
ad163a7e JA	58	};
ad163a7e JA	59
b8fb5b4f	60	void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
9eae8655	61	void io_rsrc_node_destroy(struct io_ring_ctx ctx, struct io_rsrc_node ref_node);
2933ae6e	62	struct io_rsrc_node io_rsrc_node_alloc(struct io_ring_ctx ctx);
63fea890	63	int io_queue_rsrc_removal(struct io_rsrc_data data, unsigned idx, void rsrc);
73572984	64
c059f785 PB	65	int io_import_fixed(int ddir, struct iov_iter *iter,
	66	struct io_mapped_ubuf *imu,
	67	u64 buf_addr, size_t len);
73572984 JA	68
	69	void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
	70	int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
	71	int io_sqe_buffers_register(struct io_ring_ctx ctx, void __user arg,
	72	unsigned int nr_args, u64 __user *tags);
	73	void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
	74	int io_sqe_files_unregister(struct io_ring_ctx *ctx);
	75	int io_sqe_files_register(struct io_ring_ctx ctx, void __user arg,
	76	unsigned nr_args, u64 __user *tags);
	77
73572984 JA	78	int io_register_files_update(struct io_ring_ctx ctx, void __user arg,
	79	unsigned nr_args);
	80	int io_register_rsrc_update(struct io_ring_ctx ctx, void __user arg,
	81	unsigned size, unsigned type);
	82	int io_register_rsrc(struct io_ring_ctx ctx, void __user arg,
	83	unsigned int size, unsigned int type);
	84
1f2c8f61	85	static inline void io_put_rsrc_node(struct io_ring_ctx ctx, struct io_rsrc_node node)
73572984	86	{
1f2c8f61 PB	87	lockdep_assert_held(&ctx->uring_lock);
1f2c8f61 PB	88
ef8ae64f PB	89	if (node && !--node->refs)
ef8ae64f PB	90	io_rsrc_node_ref_zero(node);
73572984 JA	91	}
	92
	93	static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
	94	struct io_ring_ctx *ctx)
73572984	95	{
1f2c8f61	96	io_put_rsrc_node(ctx, req->rsrc_node);
73572984 JA	97	}
73572984 JA	98
8e15c0e7 PB	99	static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
8e15c0e7 PB	100	struct io_rsrc_node *node)
68ef5578	101	{
ef8ae64f	102	node->refs++;
68ef5578 PB	103	}
68ef5578 PB	104
3f302388 JA	105	static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
	106	struct io_ring_ctx *ctx)
	107	{
	108	lockdep_assert_held(&ctx->uring_lock);
	109	req->rsrc_node = ctx->rsrc_node;
	110	io_charge_rsrc_node(ctx, ctx->rsrc_node);
	111	}
	112
73572984 JA	113	static inline void io_req_set_rsrc_node(struct io_kiocb *req,
	114	struct io_ring_ctx *ctx,
	115	unsigned int issue_flags)
	116	{
	117	if (!req->rsrc_node) {
4ff0b50d	118	io_ring_submit_lock(ctx, issue_flags);
3f302388	119	__io_req_set_rsrc_node(req, ctx);
4ff0b50d	120	io_ring_submit_unlock(ctx, issue_flags);
73572984 JA	121	}
	122	}
	123
	124	static inline u64 io_get_tag_slot(struct io_rsrc_data data, unsigned int idx)
	125	{
	126	unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
	127	unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
	128
	129	return &data->tags[table_idx][off];
	130	}
	131
2933ae6e PB	132	static inline int io_rsrc_init(struct io_ring_ctx *ctx)
	133	{
	134	ctx->rsrc_node = io_rsrc_node_alloc(ctx);
	135	return ctx->rsrc_node ? 0 : -ENOMEM;
	136	}
	137
d9808ceb PB	138	int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
d9808ceb PB	139	int io_files_update_prep(struct io_kiocb req, const struct io_uring_sqe sqe);
6a9ce66f PB	140
	141	int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
	142
	143	static inline void __io_unaccount_mem(struct user_struct *user,
	144	unsigned long nr_pages)
	145	{
	146	atomic_long_sub(nr_pages, &user->locked_vm);
	147	}
	148
73572984	149	#endif