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 <linux/iomap.h> 14 15 #include "inode.h" 16 17 struct inode; 18 struct gfs2_inode; 19 struct page; 20 21 22 /** 23 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file 24 * @ip: the file 25 * @len: the number of bytes to be written to the file 26 * @data_blocks: returns the number of data blocks required 27 * @ind_blocks: returns the number of indirect blocks required 28 * 29 */ 30 31 static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip, 32 unsigned int len, 33 unsigned int *data_blocks, 34 unsigned int *ind_blocks) 35 { 36 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 37 unsigned int tmp; 38 39 BUG_ON(gfs2_is_dir(ip)); 40 *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; 41 *ind_blocks = 3 * (sdp->sd_max_height - 1); 42 43 for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { 44 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); 45 *ind_blocks += tmp; 46 } 47 } 48 49 extern const struct iomap_ops gfs2_iomap_ops; 50 51 extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page); 52 extern int gfs2_block_map(struct inode *inode, sector_t lblock, 53 struct buffer_head *bh, int create); 54 extern int gfs2_iomap_get_alloc(struct inode *inode, loff_t pos, loff_t length, 55 struct iomap *iomap); 56 extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, 57 u64 *dblock, unsigned *extlen); 58 extern int gfs2_setattr_size(struct inode *inode, u64 size); 59 extern void gfs2_trim_blocks(struct inode *inode); 60 extern int gfs2_truncatei_resume(struct gfs2_inode *ip); 61 extern int gfs2_file_dealloc(struct gfs2_inode *ip); 62 extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, 63 unsigned int len); 64 extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd); 65 extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd); 66 extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length); 67 extern int gfs2_lblk_to_dblk(struct inode *inode, u32 lblock, u64 *dblock); 68 69 #endif /* __BMAP_DOT_H__ */ 70