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 * 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
20 * Written by Koji Sato <koji@osrg.net>.
23 #ifndef _NILFS_SUFILE_H
24 #define _NILFS_SUFILE_H
27 #include <linux/buffer_head.h>
28 #include <linux/nilfs2_fs.h>
32 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
34 return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
37 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
39 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
40 int nilfs_sufile_alloc(struct inode *, __u64 *);
41 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
42 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
43 unsigned long nblocks, time_t modtime);
44 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
45 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
47 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned , size_t);
49 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
50 void (*dofunc)(struct inode *, __u64,
52 struct buffer_head *));
53 int nilfs_sufile_update(struct inode *, __u64, int,
54 void (*dofunc)(struct inode *, __u64,
56 struct buffer_head *));
57 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
58 struct buffer_head *);
59 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
60 struct buffer_head *);
61 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
62 struct buffer_head *);
63 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
64 struct buffer_head *);
66 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
67 int nilfs_sufile_read(struct super_block *sb, size_t susize,
68 struct nilfs_inode *raw_inode, struct inode **inodep);
69 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
72 * nilfs_sufile_scrap - make a segment garbage
73 * @sufile: inode of segment usage file
74 * @segnum: segment number to be freed
76 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
78 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
82 * nilfs_sufile_free - free segment
83 * @sufile: inode of segment usage file
84 * @segnum: segment number to be freed
86 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
88 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
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
98 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
99 size_t nsegs, size_t *ndone)
101 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
102 nilfs_sufile_do_free);
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
112 * Return Value: On success, 0 is returned. On error, a negative error codes
115 static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
116 __u64 *segnumv, size_t nsegs,
119 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
120 nilfs_sufile_do_cancel_free);
124 * nilfs_sufile_set_error - mark a segment as erroneous
125 * @sufile: inode of segment usage file
126 * @segnum: segment number
128 * Description: nilfs_sufile_set_error() marks the segment specified by
129 * @segnum as erroneous. The error segment will never be used again.
131 * Return Value: On success, 0 is returned. On error, one of the following
132 * negative error codes is returned.
136 * %-ENOMEM - Insufficient amount of memory available.
138 * %-EINVAL - Invalid segment usage number.
140 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
142 return nilfs_sufile_update(sufile, segnum, 0,
143 nilfs_sufile_do_set_error);
146 #endif /* _NILFS_SUFILE_H */