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

// 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);

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
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	#ifndef IOU_RSRC_H
	3	#define IOU_RSRC_H
	4
	5	#include <linux/io_uring_types.h>
	6	#include <linux/lockdep.h>
	7
	8	#define IO_VEC_CACHE_SOFT_CAP 256
	9
	10	enum {
	11	IORING_RSRC_FILE = 0,
	12	IORING_RSRC_BUFFER = 1,
	13	};
	14
	15	struct io_rsrc_node {
	16	unsigned char type;
	17	int refs;
	18
	19	u64 tag;
	20	union {
	21	unsigned long file_ptr;
	22	struct io_mapped_ubuf *buf;
	23	};
	24	};
	25
	26	enum {
	27	IO_IMU_DEST = 1 << ITER_DEST,
	28	IO_IMU_SOURCE = 1 << ITER_SOURCE,
	29	};
	30
	31	struct io_mapped_ubuf {
	32	u64 ubuf;
	33	unsigned int len;
	34	unsigned int nr_bvecs;
	35	unsigned int folio_shift;
	36	refcount_t refs;
	37	unsigned long acct_pages;
	38	void (release)(void );
	39	void *priv;
	40	bool is_kbuf;
	41	u8 dir;
	42	struct bio_vec bvec[] __counted_by(nr_bvecs);
	43	};
	44
	45	struct io_imu_folio_data {
	46	/* Head folio can be partially included in the fixed buf */
	47	unsigned int nr_pages_head;
	48	/* For non-head/tail folios, has to be fully included */
	49	unsigned int nr_pages_mid;
	50	unsigned int folio_shift;
	51	unsigned int nr_folios;
	52	unsigned long first_folio_page_idx;
	53	};
	54
	55	bool io_rsrc_cache_init(struct io_ring_ctx *ctx);
	56	void io_rsrc_cache_free(struct io_ring_ctx *ctx);
	57	struct io_rsrc_node io_rsrc_node_alloc(struct io_ring_ctx ctx, int type);
	58	void io_free_rsrc_node(struct io_ring_ctx ctx, struct io_rsrc_node node);
	59	void io_rsrc_data_free(struct io_ring_ctx ctx, struct io_rsrc_data data);
	60	int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr);
	61
	62	struct io_rsrc_node io_find_buf_node(struct io_kiocb req,
	63	unsigned issue_flags);
	64	int io_import_reg_buf(struct io_kiocb req, struct iov_iter iter,
	65	u64 buf_addr, size_t len, int ddir,
	66	unsigned issue_flags);
	67	int io_import_reg_vec(int ddir, struct iov_iter *iter,
	68	struct io_kiocb req, struct iou_vec vec,
	69	unsigned nr_iovs, unsigned issue_flags);
	70	int io_prep_reg_iovec(struct io_kiocb req, struct iou_vec iv,
	71	const struct iovec __user *uvec, size_t uvec_segs);
	72
	73	int io_register_clone_buffers(struct io_ring_ctx ctx, void __user arg);
	74	int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
	75	int io_sqe_buffers_register(struct io_ring_ctx ctx, void __user arg,
	76	unsigned int nr_args, u64 __user *tags);
	77	int io_sqe_files_unregister(struct io_ring_ctx *ctx);
	78	int io_sqe_files_register(struct io_ring_ctx ctx, void __user arg,
	79	unsigned nr_args, u64 __user *tags);
	80
	81	int io_register_files_update(struct io_ring_ctx ctx, void __user arg,
	82	unsigned nr_args);
	83	int io_register_rsrc_update(struct io_ring_ctx ctx, void __user arg,
	84	unsigned size, unsigned type);
	85	int io_register_rsrc(struct io_ring_ctx ctx, void __user arg,
	86	unsigned int size, unsigned int type);
	87	int io_validate_user_buf_range(u64 uaddr, u64 ulen);
	88
	89	bool io_check_coalesce_buffer(struct page **page_array, int nr_pages,
	90	struct io_imu_folio_data *data);
	91
	92	static inline struct io_rsrc_node io_rsrc_node_lookup(struct io_rsrc_data data,
	93	int index)
	94	{
	95	if (index < data->nr)
	96	return data->nodes[array_index_nospec(index, data->nr)];
	97	return NULL;
	98	}
	99
	100	static inline void io_put_rsrc_node(struct io_ring_ctx ctx, struct io_rsrc_node node)
	101	{
	102	lockdep_assert_held(&ctx->uring_lock);
	103	if (!--node->refs)
	104	io_free_rsrc_node(ctx, node);
	105	}
	106
	107	static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx,
	108	struct io_rsrc_data *data, int index)
	109	{
	110	struct io_rsrc_node *node = data->nodes[index];
	111
	112	if (!node)
	113	return false;
	114	io_put_rsrc_node(ctx, node);
	115	data->nodes[index] = NULL;
	116	return true;
	117	}
	118
	119	int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
	120	int io_files_update_prep(struct io_kiocb req, const struct io_uring_sqe sqe);
	121
	122	int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
	123
	124	static inline void __io_unaccount_mem(struct user_struct *user,
	125	unsigned long nr_pages)
	126	{
	127	atomic_long_sub(nr_pages, &user->locked_vm);
	128	}
	129
	130	void io_vec_free(struct iou_vec *iv);
	131	int io_vec_realloc(struct iou_vec *iv, unsigned nr_entries);
	132
	133	static inline void io_vec_reset_iovec(struct iou_vec *iv,
	134	struct iovec *iovec, unsigned nr)
	135	{
	136	io_vec_free(iv);
	137	iv->iovec = iovec;
	138	iv->nr = nr;
	139	}
	140
	141	static inline void io_alloc_cache_vec_kasan(struct iou_vec *iv)
	142	{
	143	if (IS_ENABLED(CONFIG_KASAN))
	144	io_vec_free(iv);
	145	}
	146
	147	#endif