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-rw-r--r--fs/nilfs2/ifile.c150
-rw-r--r--fs/nilfs2/ifile.h53
2 files changed, 203 insertions, 0 deletions
diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c
new file mode 100644
index 000000000000..de86401f209f
--- /dev/null
+++ b/fs/nilfs2/ifile.c
@@ -0,0 +1,150 @@
1/*
2 * ifile.c - NILFS inode 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 * 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
19 *
20 * Written by Amagai Yoshiji <amagai@osrg.net>.
21 * Revised by Ryusuke Konishi <ryusuke@osrg.net>.
22 *
23 */
24
25#include <linux/types.h>
26#include <linux/buffer_head.h>
27#include "nilfs.h"
28#include "mdt.h"
29#include "alloc.h"
30#include "ifile.h"
31
32/**
33 * nilfs_ifile_create_inode - create a new disk inode
34 * @ifile: ifile inode
35 * @out_ino: pointer to a variable to store inode number
36 * @out_bh: buffer_head contains newly allocated disk inode
37 *
38 * Return Value: On success, 0 is returned and the newly allocated inode
39 * number is stored in the place pointed by @ino, and buffer_head pointer
40 * that contains newly allocated disk inode structure is stored in the
41 * place pointed by @out_bh
42 * On error, one of the following negative error codes is returned.
43 *
44 * %-EIO - I/O error.
45 *
46 * %-ENOMEM - Insufficient amount of memory available.
47 *
48 * %-ENOSPC - No inode left.
49 */
50int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
51 struct buffer_head **out_bh)
52{
53 struct nilfs_palloc_req req;
54 int ret;
55
56 req.pr_entry_nr = 0; /* 0 says find free inode from beginning of
57 a group. dull code!! */
58 req.pr_entry_bh = NULL;
59
60 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
61 if (!ret) {
62 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
63 &req.pr_entry_bh);
64 if (ret < 0)
65 nilfs_palloc_abort_alloc_entry(ifile, &req);
66 }
67 if (ret < 0) {
68 brelse(req.pr_entry_bh);
69 return ret;
70 }
71 nilfs_palloc_commit_alloc_entry(ifile, &req);
72 nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
73 nilfs_mdt_mark_dirty(ifile);
74 *out_ino = (ino_t)req.pr_entry_nr;
75 *out_bh = req.pr_entry_bh;
76 return 0;
77}
78
79/**
80 * nilfs_ifile_delete_inode - delete a disk inode
81 * @ifile: ifile inode
82 * @ino: inode number
83 *
84 * Return Value: On success, 0 is returned. On error, one of the following
85 * negative error codes is returned.
86 *
87 * %-EIO - I/O error.
88 *
89 * %-ENOMEM - Insufficient amount of memory available.
90 *
91 * %-ENOENT - The inode number @ino have not been allocated.
92 */
93int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
94{
95 struct nilfs_palloc_req req = {
96 .pr_entry_nr = ino, .pr_entry_bh = NULL
97 };
98 struct nilfs_inode *raw_inode;
99 void *kaddr;
100 int ret;
101
102 ret = nilfs_palloc_prepare_free_entry(ifile, &req);
103 if (!ret) {
104 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
105 &req.pr_entry_bh);
106 if (ret < 0)
107 nilfs_palloc_abort_free_entry(ifile, &req);
108 }
109 if (ret < 0) {
110 brelse(req.pr_entry_bh);
111 return ret;
112 }
113
114 kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0);
115 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
116 req.pr_entry_bh, kaddr);
117 raw_inode->i_flags = 0;
118 kunmap_atomic(kaddr, KM_USER0);
119
120 nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
121 brelse(req.pr_entry_bh);
122
123 nilfs_palloc_commit_free_entry(ifile, &req);
124
125 return 0;
126}
127
128int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
129 struct buffer_head **out_bh)
130{
131 struct super_block *sb = ifile->i_sb;
132 int err;
133
134 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
135 nilfs_error(sb, __func__, "bad inode number: %lu",
136 (unsigned long) ino);
137 return -EINVAL;
138 }
139
140 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
141 if (unlikely(err)) {
142 if (err == -EINVAL)
143 nilfs_error(sb, __func__, "ifile is broken");
144 else
145 nilfs_warning(sb, __func__,
146 "unable to read inode: %lu",
147 (unsigned long) ino);
148 }
149 return err;
150}
diff --git a/fs/nilfs2/ifile.h b/fs/nilfs2/ifile.h
new file mode 100644
index 000000000000..5d30a35679b5
--- /dev/null
+++ b/fs/nilfs2/ifile.h
@@ -0,0 +1,53 @@
1/*
2 * ifile.h - NILFS inode 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 * 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
19 *
20 * Written by Amagai Yoshiji <amagai@osrg.net>
21 * Revised by Ryusuke Konishi <ryusuke@osrg.net>
22 *
23 */
24
25#ifndef _NILFS_IFILE_H
26#define _NILFS_IFILE_H
27
28#include <linux/fs.h>
29#include <linux/buffer_head.h>
30#include <linux/nilfs2_fs.h>
31#include "mdt.h"
32#include "alloc.h"
33
34#define NILFS_IFILE_GFP NILFS_MDT_GFP
35
36static inline struct nilfs_inode *
37nilfs_ifile_map_inode(struct inode *ifile, ino_t ino, struct buffer_head *ibh)
38{
39 void *kaddr = kmap(ibh->b_page);
40 return nilfs_palloc_block_get_entry(ifile, ino, ibh, kaddr);
41}
42
43static inline void nilfs_ifile_unmap_inode(struct inode *ifile, ino_t ino,
44 struct buffer_head *ibh)
45{
46 kunmap(ibh->b_page);
47}
48
49int nilfs_ifile_create_inode(struct inode *, ino_t *, struct buffer_head **);
50int nilfs_ifile_delete_inode(struct inode *, ino_t);
51int nilfs_ifile_get_inode_block(struct inode *, ino_t, struct buffer_head **);
52
53#endif /* _NILFS_IFILE_H */
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