1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7 #ifndef __BMAP_DOT_H__ 8 #define __BMAP_DOT_H__ 9 10 #include <linux/iomap.h> 11 12 #include "inode.h" 13 14 struct inode; 15 struct gfs2_inode; 16 struct page; 17 18 19 /** 20 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file 21 * @ip: the file 22 * @len: the number of bytes to be written to the file 23 * @data_blocks: returns the number of data blocks required 24 * @ind_blocks: returns the number of indirect blocks required 25 * 26 */ 27 28 static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip, 29 unsigned int len, 30 unsigned int *data_blocks, 31 unsigned int *ind_blocks) 32 { 33 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 34 unsigned int tmp; 35 36 BUG_ON(gfs2_is_dir(ip)); 37 *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; 38 *ind_blocks = 3 * (sdp->sd_max_height - 1); 39 40 for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { 41 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); 42 *ind_blocks += tmp; 43 } 44 } 45 46 extern const struct iomap_ops gfs2_iomap_ops; 47 extern const struct iomap_writeback_ops gfs2_writeback_ops; 48 49 extern int gfs2_unstuff_dinode(struct gfs2_inode *ip); 50 extern int gfs2_block_map(struct inode *inode, sector_t lblock, 51 struct buffer_head *bh, int create); 52 extern int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length, 53 struct iomap *iomap); 54 extern int gfs2_iomap_alloc(struct inode *inode, loff_t pos, loff_t length, 55 struct iomap *iomap); 56 extern int gfs2_get_extent(struct inode *inode, u64 lblock, u64 *dblock, 57 unsigned int *extlen); 58 extern int gfs2_alloc_extent(struct inode *inode, u64 lblock, u64 *dblock, 59 unsigned *extlen, bool *new); 60 extern int gfs2_setattr_size(struct inode *inode, u64 size); 61 extern void gfs2_trim_blocks(struct inode *inode); 62 extern int gfs2_truncatei_resume(struct gfs2_inode *ip); 63 extern int gfs2_file_dealloc(struct gfs2_inode *ip); 64 extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, 65 unsigned int len); 66 extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd); 67 extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd); 68 extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length); 69 70 #endif /* __BMAP_DOT_H__ */ 71