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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788/* SPDX-License-Identifier: GPL-2.0-only *//* * Copyright (C) 2003 Sistina Software * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved. * * Device-Mapper low-level I/O. * * This file is released under the GPL. */
#ifndef _LINUX_DM_IO_H#define _LINUX_DM_IO_H
#ifdef __KERNEL__
#include <linux/types.h>#include <linux/blk_types.h>
struct dm_io_region { struct block_device *bdev; sector_t sector; sector_t count; /* If this is zero the region is ignored. */};
struct page_list { struct page_list *next; struct page *page;};
typedef void (*io_notify_fn)(unsigned int long error, void *context);
enum dm_io_mem_type { DM_IO_PAGE_LIST,/* Page list */ DM_IO_BIO, /* Bio vector */ DM_IO_VMA, /* Virtual memory area */ DM_IO_KMEM, /* Kernel memory */};
struct dm_io_memory { enum dm_io_mem_type type;
unsigned int offset;
union { struct page_list *pl; struct bio *bio; void *vma; void *addr; } ptr;};
struct dm_io_notify { io_notify_fn fn; /* Callback for asynchronous requests */ void *context; /* Passed to callback */};
/* * IO request structure */struct dm_io_client;struct dm_io_request { blk_opf_t bi_opf; /* Request type and flags */ struct dm_io_memory mem; /* Memory to use for io */ struct dm_io_notify notify; /* Synchronous if notify.fn is NULL */ struct dm_io_client *client; /* Client memory handler */};
/* * For async io calls, users can alternatively use the dm_io() function below * and dm_io_client_create() to create private mempools for the client. * * Create/destroy may block. */struct dm_io_client *dm_io_client_create(void);void dm_io_client_destroy(struct dm_io_client *client);
/* * IO interface using private per-client pools. * Each bit in the optional 'sync_error_bits' bitset indicates whether an * error occurred doing io to the corresponding region. */int dm_io(struct dm_io_request *io_req, unsigned int num_regions, struct dm_io_region *region, unsigned int long *sync_error_bits, unsigned short ioprio);
#endif /* __KERNEL__ */#endif /* _LINUX_DM_IO_H */