1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * NILFS segment usage file.
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato.
8 */
9
10 #ifndef _NILFS_SUFILE_H
11 #define _NILFS_SUFILE_H
12
13 #include <linux/fs.h>
14 #include <linux/buffer_head.h>
15 #include "mdt.h"
16
17
18 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
19 {
20 return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
21 }
22
23 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
24
25 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
26 int nilfs_sufile_alloc(struct inode *, __u64 *);
27 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
28 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
29 unsigned long nblocks, time64_t modtime);
30 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
31 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int,
32 size_t);
33 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned int, size_t);
34
35 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
36 void (*dofunc)(struct inode *, __u64,
37 struct buffer_head *,
38 struct buffer_head *));
39 int nilfs_sufile_update(struct inode *, __u64, int,
40 void (*dofunc)(struct inode *, __u64,
41 struct buffer_head *,
42 struct buffer_head *));
43 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
44 struct buffer_head *);
45 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
46 struct buffer_head *);
47 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
48 struct buffer_head *);
49 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
50 struct buffer_head *);
51
52 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
53 int nilfs_sufile_read(struct super_block *sb, size_t susize,
54 struct nilfs_inode *raw_inode, struct inode **inodep);
55 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
56
57 /**
58 * nilfs_sufile_scrap - make a segment garbage
59 * @sufile: inode of segment usage file
60 * @segnum: segment number to be freed
61 */
62 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
63 {
64 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
65 }
66
67 /**
68 * nilfs_sufile_free - free segment
69 * @sufile: inode of segment usage file
70 * @segnum: segment number to be freed
71 */
72 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
73 {
74 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
75 }
76
77 /**
78 * nilfs_sufile_freev - free segments
79 * @sufile: inode of segment usage file
80 * @segnumv: array of segment numbers
81 * @nsegs: size of @segnumv array
82 * @ndone: place to store the number of freed segments
83 */
84 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
85 size_t nsegs, size_t *ndone)
86 {
87 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
88 nilfs_sufile_do_free);
89 }
90
91 /**
92 * nilfs_sufile_cancel_freev - reallocate freeing 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 cancelled segments
97 *
98 * Return Value: On success, 0 is returned. On error, a negative error codes
99 * is returned.
100 */
101 static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
102 __u64 *segnumv, size_t nsegs,
103 size_t *ndone)
104 {
105 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
106 nilfs_sufile_do_cancel_free);
107 }
108
109 /**
110 * nilfs_sufile_set_error - mark a segment as erroneous
111 * @sufile: inode of segment usage file
112 * @segnum: segment number
113 *
114 * Description: nilfs_sufile_set_error() marks the segment specified by
115 * @segnum as erroneous. The error segment will never be used again.
116 *
117 * Return Value: On success, 0 is returned. On error, one of the following
118 * negative error codes is returned.
119 *
120 * %-EIO - I/O error.
121 *
122 * %-ENOMEM - Insufficient amount of memory available.
123 *
124 * %-EINVAL - Invalid segment usage number.
125 */
126 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
127 {
128 return nilfs_sufile_update(sufile, segnum, 0,
129 nilfs_sufile_do_set_error);
130 }
131
132 #endif /* _NILFS_SUFILE_H */
133
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