1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #ifndef __BMAP_DOT_H__ 11 #define __BMAP_DOT_H__ 12 13 #include "inode.h" 14 15 struct inode; 16 struct gfs2_inode; 17 struct page; 18 19 20 /** 21 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file 22 * @ip: the file 23 * @len: the number of bytes to be written to the file 24 * @data_blocks: returns the number of data blocks required 25 * @ind_blocks: returns the number of indirect blocks required 26 * 27 */ 28 29 static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip, 30 unsigned int len, 31 unsigned int *data_blocks, 32 unsigned int *ind_blocks) 33 { 34 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 35 unsigned int tmp; 36 37 BUG_ON(gfs2_is_dir(ip)); 38 *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; 39 *ind_blocks = 3 * (sdp->sd_max_height - 1); 40 41 for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { 42 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); 43 *ind_blocks += tmp; 44 } 45 } 46 47 extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page); 48 extern int gfs2_block_map(struct inode *inode, sector_t lblock, 49 struct buffer_head *bh, int create); 50 extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, 51 u64 *dblock, unsigned *extlen); 52 extern int gfs2_setattr_size(struct inode *inode, u64 size); 53 extern void gfs2_trim_blocks(struct inode *inode); 54 extern int gfs2_truncatei_resume(struct gfs2_inode *ip); 55 extern int gfs2_file_dealloc(struct gfs2_inode *ip); 56 extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, 57 unsigned int len); 58 59 #endif /* __BMAP_DOT_H__ */ 60