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| 2 | |
| 3 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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| 4 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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| 5 |
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| 6 |
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| 7 | #ifndef __BMAP_DOT_H__
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| 8 | #define __BMAP_DOT_H__
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| 9 |
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| 10 | #include <linux/iomap.h>
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| 11 |
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| 12 | #include "inode.h"
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| 13 |
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| 14 | struct inode;
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| 15 | struct gfs2_inode;
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| 16 | struct page;
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| 17 |
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| 18 |
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| 19 | |
| 20 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
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| 21 | * @ip: the file
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| 22 | * @len: the number of bytes to be written to the file
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| 23 | * @data_blocks: returns the number of data blocks required
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| 24 | * @ind_blocks: returns the number of indirect blocks required
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| 25 | *
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| 26 |
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| 27 |
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| 28 | static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
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| 29 | unsigned int len,
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| 30 | unsigned int *data_blocks,
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| 31 | unsigned int *ind_blocks)
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| 32 | {
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| 33 | const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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| 34 | unsigned int tmp;
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| 35 |
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| 36 | BUG_ON(gfs2_is_dir(ip));
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| 37 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
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| 38 | *ind_blocks = 3 * (sdp->sd_max_height - 1);
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| 39 |
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| 40 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
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| 41 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
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| 42 | *ind_blocks += tmp;
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| 43 | }
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| 44 | }
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| 45 |
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| 46 | extern const struct iomap_ops gfs2_iomap_ops;
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| 47 | extern const struct iomap_write_ops gfs2_iomap_write_ops;
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| 48 | extern const struct iomap_writeback_ops gfs2_writeback_ops;
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| 49 |
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| 50 | int gfs2_unstuff_dinode(struct gfs2_inode *ip);
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| 51 | int gfs2_block_map(struct inode *inode, sector_t lblock,
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| 52 | struct buffer_head *bh, int create);
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| 53 | int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
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| 54 | struct iomap *iomap);
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| 55 | int gfs2_iomap_alloc(struct inode *inode, loff_t pos, loff_t length,
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| 56 | struct iomap *iomap);
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| 57 | int gfs2_get_extent(struct inode *inode, u64 lblock, u64 *dblock,
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| 58 | unsigned int *extlen);
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| 59 | int gfs2_alloc_extent(struct inode *inode, u64 lblock, u64 *dblock,
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| 60 | unsigned *extlen, bool *new);
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| 61 | int gfs2_clear_beyond_eof(struct inode *inode, loff_t end);
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| 62 | int gfs2_setattr_size(struct inode *inode, u64 size);
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| 63 | int gfs2_truncatei_resume(struct gfs2_inode *ip);
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| 64 | int gfs2_file_dealloc(struct gfs2_inode *ip);
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| 65 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
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| 66 | unsigned int len);
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| 67 | int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
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| 68 | void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
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| 69 | int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
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| 70 |
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| 71 | #endif
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