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fs/gfs2/bmap.h
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/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
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* * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions |
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* of the GNU General Public License version 2. |
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*/ #ifndef __BMAP_DOT_H__ #define __BMAP_DOT_H__ |
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#include "inode.h" |
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struct inode; struct gfs2_inode; struct page; |
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/** * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file * @ip: the file * @len: the number of bytes to be written to the file * @data_blocks: returns the number of data blocks required * @ind_blocks: returns the number of indirect blocks required * */ static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip, unsigned int len, unsigned int *data_blocks, unsigned int *ind_blocks) { const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); unsigned int tmp; BUG_ON(gfs2_is_dir(ip)); *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; *ind_blocks = 3 * (sdp->sd_max_height - 1); for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); *ind_blocks += tmp; } } |
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extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page); extern int gfs2_block_map(struct inode *inode, sector_t lblock, struct buffer_head *bh, int create); extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen); extern int gfs2_setattr_size(struct inode *inode, u64 size); extern void gfs2_trim_blocks(struct inode *inode); extern int gfs2_truncatei_resume(struct gfs2_inode *ip); extern int gfs2_file_dealloc(struct gfs2_inode *ip); extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, unsigned int len); |
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#endif /* __BMAP_DOT_H__ */ |