2 * sufile.h - NILFS segment usage file.
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
16 * Written by Koji Sato.
19 #ifndef _NILFS_SUFILE_H
20 #define _NILFS_SUFILE_H
23 #include <linux/buffer_head.h>
24 #include <linux/nilfs2_fs.h>
28 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
30 return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
33 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
35 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
36 int nilfs_sufile_alloc(struct inode *, __u64 *);
37 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
38 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
39 unsigned long nblocks, time_t modtime);
40 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
41 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int,
43 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned int, size_t);
45 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
46 void (*dofunc)(struct inode *, __u64,
48 struct buffer_head *));
49 int nilfs_sufile_update(struct inode *, __u64, int,
50 void (*dofunc)(struct inode *, __u64,
52 struct buffer_head *));
53 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
54 struct buffer_head *);
55 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
56 struct buffer_head *);
57 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
58 struct buffer_head *);
59 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
60 struct buffer_head *);
62 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
63 int nilfs_sufile_read(struct super_block *sb, size_t susize,
64 struct nilfs_inode *raw_inode, struct inode **inodep);
65 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
68 * nilfs_sufile_scrap - make a segment garbage
69 * @sufile: inode of segment usage file
70 * @segnum: segment number to be freed
72 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
74 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
78 * nilfs_sufile_free - free segment
79 * @sufile: inode of segment usage file
80 * @segnum: segment number to be freed
82 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
84 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
88 * nilfs_sufile_freev - free segments
89 * @sufile: inode of segment usage file
90 * @segnumv: array of segment numbers
91 * @nsegs: size of @segnumv array
92 * @ndone: place to store the number of freed segments
94 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
95 size_t nsegs, size_t *ndone)
97 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
98 nilfs_sufile_do_free);
102 * nilfs_sufile_cancel_freev - reallocate freeing segments
103 * @sufile: inode of segment usage file
104 * @segnumv: array of segment numbers
105 * @nsegs: size of @segnumv array
106 * @ndone: place to store the number of cancelled segments
108 * Return Value: On success, 0 is returned. On error, a negative error codes
111 static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
112 __u64 *segnumv, size_t nsegs,
115 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
116 nilfs_sufile_do_cancel_free);
120 * nilfs_sufile_set_error - mark a segment as erroneous
121 * @sufile: inode of segment usage file
122 * @segnum: segment number
124 * Description: nilfs_sufile_set_error() marks the segment specified by
125 * @segnum as erroneous. The error segment will never be used again.
127 * Return Value: On success, 0 is returned. On error, one of the following
128 * negative error codes is returned.
132 * %-ENOMEM - Insufficient amount of memory available.
134 * %-EINVAL - Invalid segment usage number.
136 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
138 return nilfs_sufile_update(sufile, segnum, 0,
139 nilfs_sufile_do_set_error);
142 #endif /* _NILFS_SUFILE_H */