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 */