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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #ifndef __BMAP_DOT_H__ | |
11 | #define __BMAP_DOT_H__ | |
12 | ||
7ed122e4 SW |
13 | #include "inode.h" |
14 | ||
f2f7ba52 SW |
15 | struct inode; |
16 | struct gfs2_inode; | |
17 | struct page; | |
18 | ||
7ed122e4 SW |
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 | ||
f25ef0c1 | 47 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page); |
e9e1ef2b | 48 | int gfs2_block_map(struct inode *inode, sector_t lblock, struct buffer_head *bh, int create); |
fd88de56 | 49 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen); |
b3b94faa | 50 | |
cd915493 | 51 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size); |
b3b94faa DT |
52 | int gfs2_truncatei_resume(struct gfs2_inode *ip); |
53 | int gfs2_file_dealloc(struct gfs2_inode *ip); | |
cd915493 | 54 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
b3b94faa DT |
55 | unsigned int len, int *alloc_required); |
56 | ||
b3b94faa | 57 | #endif /* __BMAP_DOT_H__ */ |