fe1db50c72
Improve (especially for coherence) some prototypes, and return code of init_cow_file in error case - for a short write return -EINVAL, otherwise return the error we got! Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
#ifndef __COW_H__
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#define __COW_H__
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#include <asm/types.h>
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#if defined(__KERNEL__)
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# include <asm/byteorder.h>
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# if defined(__BIG_ENDIAN)
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# define ntohll(x) (x)
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# define htonll(x) (x)
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# elif defined(__LITTLE_ENDIAN)
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# define ntohll(x) be64_to_cpu(x)
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# define htonll(x) cpu_to_be64(x)
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# else
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# error "Could not determine byte order"
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# endif
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#else
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/* For the definition of ntohl, htonl and __BYTE_ORDER */
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#include <endian.h>
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#include <netinet/in.h>
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#if defined(__BYTE_ORDER)
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# if __BYTE_ORDER == __BIG_ENDIAN
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# define ntohll(x) (x)
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# define htonll(x) (x)
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# elif __BYTE_ORDER == __LITTLE_ENDIAN
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# define ntohll(x) bswap_64(x)
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# define htonll(x) bswap_64(x)
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# else
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# error "Could not determine byte order: __BYTE_ORDER uncorrectly defined"
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# endif
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#else /* ! defined(__BYTE_ORDER) */
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# error "Could not determine byte order: __BYTE_ORDER not defined"
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#endif
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#endif /* ! defined(__KERNEL__) */
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extern int init_cow_file(int fd, char *cow_file, char *backing_file,
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int sectorsize, int alignment, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out);
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extern int file_reader(__u64 offset, char *buf, int len, void *arg);
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extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
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void *arg, __u32 *version_out,
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char **backing_file_out, time_t *mtime_out,
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__u64 *size_out, int *sectorsize_out,
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__u32 *align_out, int *bitmap_offset_out);
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extern int write_cow_header(char *cow_file, int fd, char *backing_file,
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int sectorsize, int alignment,
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unsigned long long *size);
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extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
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int bitmap_offset, unsigned long *bitmap_len_out,
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int *data_offset_out);
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#endif
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/*
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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