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Linux kernel mirror (for testing)
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linux
1/*
2 * sufile.h - NILFS segment usage file.
3 *
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>.
21 */
22
23#ifndef _NILFS_SUFILE_H
24#define _NILFS_SUFILE_H
25
26#include <linux/fs.h>
27#include <linux/buffer_head.h>
28#include <linux/nilfs2_fs.h>
29#include "mdt.h"
30
31
32static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
33{
34 return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
35}
36
37unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
38
39int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
40int nilfs_sufile_alloc(struct inode *, __u64 *);
41int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
42int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
43 unsigned long nblocks, time_t modtime);
44int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
45ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
46 size_t);
47ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned , size_t);
48
49int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
50 void (*dofunc)(struct inode *, __u64,
51 struct buffer_head *,
52 struct buffer_head *));
53int nilfs_sufile_update(struct inode *, __u64, int,
54 void (*dofunc)(struct inode *, __u64,
55 struct buffer_head *,
56 struct buffer_head *));
57void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
58 struct buffer_head *);
59void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
60 struct buffer_head *);
61void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
62 struct buffer_head *);
63void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
64 struct buffer_head *);
65
66int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
67int nilfs_sufile_read(struct super_block *sb, size_t susize,
68 struct nilfs_inode *raw_inode, struct inode **inodep);
69int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
70
71/**
72 * nilfs_sufile_scrap - make a segment garbage
73 * @sufile: inode of segment usage file
74 * @segnum: segment number to be freed
75 */
76static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
77{
78 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
79}
80
81/**
82 * nilfs_sufile_free - free segment
83 * @sufile: inode of segment usage file
84 * @segnum: segment number to be freed
85 */
86static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
87{
88 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
89}
90
91/**
92 * nilfs_sufile_freev - free segments
93 * @sufile: inode of segment usage file
94 * @segnumv: array of segment numbers
95 * @nsegs: size of @segnumv array
96 * @ndone: place to store the number of freed segments
97 */
98static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
99 size_t nsegs, size_t *ndone)
100{
101 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
102 nilfs_sufile_do_free);
103}
104
105/**
106 * nilfs_sufile_cancel_freev - reallocate freeing segments
107 * @sufile: inode of segment usage file
108 * @segnumv: array of segment numbers
109 * @nsegs: size of @segnumv array
110 * @ndone: place to store the number of cancelled segments
111 *
112 * Return Value: On success, 0 is returned. On error, a negative error codes
113 * is returned.
114 */
115static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
116 __u64 *segnumv, size_t nsegs,
117 size_t *ndone)
118{
119 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
120 nilfs_sufile_do_cancel_free);
121}
122
123/**
124 * nilfs_sufile_set_error - mark a segment as erroneous
125 * @sufile: inode of segment usage file
126 * @segnum: segment number
127 *
128 * Description: nilfs_sufile_set_error() marks the segment specified by
129 * @segnum as erroneous. The error segment will never be used again.
130 *
131 * Return Value: On success, 0 is returned. On error, one of the following
132 * negative error codes is returned.
133 *
134 * %-EIO - I/O error.
135 *
136 * %-ENOMEM - Insufficient amount of memory available.
137 *
138 * %-EINVAL - Invalid segment usage number.
139 */
140static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
141{
142 return nilfs_sufile_update(sufile, segnum, 0,
143 nilfs_sufile_do_set_error);
144}
145
146#endif /* _NILFS_SUFILE_H */