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int block_commit_write(struct page *page, unsigned from, unsigned to);
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int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
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sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *);
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int block_truncate_page(struct address_space *, loff_t, get_block_t *);
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int nobh_write_begin(struct address_space *, loff_t, unsigned, unsigned,