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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 * Written by Koji Sato.
17 */
18
19 #ifndef _NILFS_SUFILE_H
20 #define _NILFS_SUFILE_H
21
22 #include <linux/fs.h>
23 #include <linux/buffer_head.h>
24 #include "mdt.h"
25
26
27 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
28 {
29 return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
30 }
31
32 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
33
34 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
35 int nilfs_sufile_alloc(struct inode *, __u64 *);
36 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
37 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
38 unsigned long nblocks, time_t modtime);
39 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
40 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int,
41 size_t);
42 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned int, size_t);
43
44 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
45 void (*dofunc)(struct inode *, __u64,
46 struct buffer_head *,
47 struct buffer_head *));
48 int nilfs_sufile_update(struct inode *, __u64, int,
49 void (*dofunc)(struct inode *, __u64,
50 struct buffer_head *,
51 struct buffer_head *));
52 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
53 struct buffer_head *);
54 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
55 struct buffer_head *);
56 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
57 struct buffer_head *);
58 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
59 struct buffer_head *);
60
61 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
62 int nilfs_sufile_read(struct super_block *sb, size_t susize,
63 struct nilfs_inode *raw_inode, struct inode **inodep);
64 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
65
66 /**
67 * nilfs_sufile_scrap - make a segment garbage
68 * @sufile: inode of segment usage file
69 * @segnum: segment number to be freed
70 */
71 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
72 {
73 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
74 }
75
76 /**
77 * nilfs_sufile_free - free segment
78 * @sufile: inode of segment usage file
79 * @segnum: segment number to be freed
80 */
81 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
82 {
83 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
84 }
85
86 /**
87 * nilfs_sufile_freev - free segments
88 * @sufile: inode of segment usage file
89 * @segnumv: array of segment numbers
90 * @nsegs: size of @segnumv array
91 * @ndone: place to store the number of freed segments
92 */
93 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
94 size_t nsegs, size_t *ndone)
95 {
96 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
97 nilfs_sufile_do_free);
98 }
99
100 /**
101 * nilfs_sufile_cancel_freev - reallocate freeing segments
102 * @sufile: inode of segment usage file
103 * @segnumv: array of segment numbers
104 * @nsegs: size of @segnumv array
105 * @ndone: place to store the number of cancelled segments
106 *
107 * Return Value: On success, 0 is returned. On error, a negative error codes
108 * is returned.
109 */
110 static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
111 __u64 *segnumv, size_t nsegs,
112 size_t *ndone)
113 {
114 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
115 nilfs_sufile_do_cancel_free);
116 }
117
118 /**
119 * nilfs_sufile_set_error - mark a segment as erroneous
120 * @sufile: inode of segment usage file
121 * @segnum: segment number
122 *
123 * Description: nilfs_sufile_set_error() marks the segment specified by
124 * @segnum as erroneous. The error segment will never be used again.
125 *
126 * Return Value: On success, 0 is returned. On error, one of the following
127 * negative error codes is returned.
128 *
129 * %-EIO - I/O error.
130 *
131 * %-ENOMEM - Insufficient amount of memory available.
132 *
133 * %-EINVAL - Invalid segment usage number.
134 */
135 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
136 {
137 return nilfs_sufile_update(sufile, segnum, 0,
138 nilfs_sufile_do_set_error);
139 }
140
141 #endif /* _NILFS_SUFILE_H */