git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| ff8f33c8 SW |
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); | |
| b3b94faa | 58 | |
| b3b94faa | 59 | #endif /* __BMAP_DOT_H__ */ |