aboutsummaryrefslogtreecommitdiffstats
path: root/fs/nilfs2/ifile.c
blob: d8e65bde083c0c46fb157d321d8ed63a6a6e0ad0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/*
 * ifile.c - NILFS inode file
 *
 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Amagai Yoshiji <amagai@osrg.net>.
 * Revised by Ryusuke Konishi <ryusuke@osrg.net>.
 *
 */

#include <linux/types.h>
#include <linux/buffer_head.h>
#include "nilfs.h"
#include "mdt.h"
#include "alloc.h"
#include "ifile.h"

/**
 * struct nilfs_ifile_info - on-memory private data of ifile
 * @mi: on-memory private data of metadata file
 * @palloc_cache: persistent object allocator cache of ifile
 */
struct nilfs_ifile_info {
	struct nilfs_mdt_info mi;
	struct nilfs_palloc_cache palloc_cache;
};

static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
{
	return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
}

/**
 * nilfs_ifile_create_inode - create a new disk inode
 * @ifile: ifile inode
 * @out_ino: pointer to a variable to store inode number
 * @out_bh: buffer_head contains newly allocated disk inode
 *
 * Return Value: On success, 0 is returned and the newly allocated inode
 * number is stored in the place pointed by @ino, and buffer_head pointer
 * that contains newly allocated disk inode structure is stored in the
 * place pointed by @out_bh
 * On error, one of the following negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-ENOSPC - No inode left.
 */
int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
			     struct buffer_head **out_bh)
{
	struct nilfs_palloc_req req;
	int ret;

	req.pr_entry_nr = 0;  /* 0 says find free inode from beginning of
				 a group. dull code!! */
	req.pr_entry_bh = NULL;

	ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
	if (!ret) {
		ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
						   &req.pr_entry_bh);
		if (ret < 0)
			nilfs_palloc_abort_alloc_entry(ifile, &req);
	}
	if (ret < 0) {
		brelse(req.pr_entry_bh);
		return ret;
	}
	nilfs_palloc_commit_alloc_entry(ifile, &req);
	mark_buffer_dirty(req.pr_entry_bh);
	nilfs_mdt_mark_dirty(ifile);
	*out_ino = (ino_t)req.pr_entry_nr;
	*out_bh = req.pr_entry_bh;
	return 0;
}

/**
 * nilfs_ifile_delete_inode - delete a disk inode
 * @ifile: ifile inode
 * @ino: inode number
 *
 * Return Value: On success, 0 is returned. On error, one of the following
 * negative error codes is returned.
 *
 * %-EIO - I/O error.
 *
 * %-ENOMEM - Insufficient amount of memory available.
 *
 * %-ENOENT - The inode number @ino have not been allocated.
 */
int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
{
	struct nilfs_palloc_req req = {
		.pr_entry_nr = ino, .pr_entry_bh = NULL
	};
	struct nilfs_inode *raw_inode;
	void *kaddr;
	int ret;

	ret = nilfs_palloc_prepare_free_entry(ifile, &req);
	if (!ret) {
		ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
						   &req.pr_entry_bh);
		if (ret < 0)
			nilfs_palloc_abort_free_entry(ifile, &req);
	}
	if (ret < 0) {
		brelse(req.pr_entry_bh);
		return ret;
	}

	kaddr = kmap_atomic(req.pr_entry_bh->b_page);
	raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
						 req.pr_entry_bh, kaddr);
	raw_inode->i_flags = 0;
	kunmap_atomic(kaddr);

	mark_buffer_dirty(req.pr_entry_bh);
	brelse(req.pr_entry_bh);

	nilfs_palloc_commit_free_entry(ifile, &req);

	return 0;
}

int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
				struct buffer_head **out_bh)
{
	struct super_block *sb = ifile->i_sb;
	int err;

	if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
		nilfs_error(sb, __func__, "bad inode number: %lu",
			    (unsigned long) ino);
		return -EINVAL;
	}

	err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
	if (unlikely(err))
		nilfs_warning(sb, __func__, "unable to read inode: %lu",
			      (unsigned long) ino);
	return err;
}

/**
 * nilfs_ifile_read - read or get ifile inode
 * @sb: super block instance
 * @root: root object
 * @inode_size: size of an inode
 * @raw_inode: on-disk ifile inode
 * @inodep: buffer to store the inode
 */
int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
		     size_t inode_size, struct nilfs_inode *raw_inode,
		     struct inode **inodep)
{
	struct inode *ifile;
	int err;

	ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
	if (unlikely(!ifile))
		return -ENOMEM;
	if (!(ifile->i_state & I_NEW))
		goto out;

	err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
			     sizeof(struct nilfs_ifile_info));
	if (err)
		goto failed;

	err = nilfs_palloc_init_blockgroup(ifile, inode_size);
	if (err)
		goto failed;

	nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);

	err = nilfs_read_inode_common(ifile, raw_inode);
	if (err)
		goto failed;

	unlock_new_inode(ifile);
 out:
	*inodep = ifile;
	return 0;
 failed:
	iget_failed(ifile);
	return err;
}