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0217fbb027
Extract this useful helper from nilfs_page_get_nth_block() Link: https://lkml.kernel.org/r/20231016201114.1928083-6-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Pankaj Raghav <p.raghav@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Buffer/page management specific to NILFS
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* Written by Ryusuke Konishi and Seiji Kihara.
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*/
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#ifndef _NILFS_PAGE_H
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#define _NILFS_PAGE_H
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#include <linux/buffer_head.h>
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#include "nilfs.h"
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/*
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* Extended buffer state bits
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*/
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enum {
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BH_NILFS_Allocated = BH_PrivateStart,
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BH_NILFS_Node,
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BH_NILFS_Volatile,
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BH_NILFS_Checked,
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BH_NILFS_Redirected,
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};
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BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
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BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
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BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
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BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
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int __nilfs_clear_page_dirty(struct page *);
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struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
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unsigned long, unsigned long);
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void nilfs_forget_buffer(struct buffer_head *);
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void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
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int nilfs_page_buffers_clean(struct page *);
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void nilfs_page_bug(struct page *);
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int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
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void nilfs_copy_back_pages(struct address_space *, struct address_space *);
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void nilfs_clear_dirty_page(struct page *, bool);
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void nilfs_clear_dirty_pages(struct address_space *, bool);
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unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
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unsigned int);
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unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
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sector_t start_blk,
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sector_t *blkoff);
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#define NILFS_PAGE_BUG(page, m, a...) \
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do { nilfs_page_bug(page); BUG(); } while (0)
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static inline struct buffer_head *
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nilfs_page_get_nth_block(struct page *page, unsigned int count)
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{
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return get_nth_bh(page_buffers(page), count);
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}
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#endif /* _NILFS_PAGE_H */
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