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