blob: 922d9dd42c8fb352f6e024688c73f9ede88e6738 [file] [log] [blame]
Ryusuke Konishi43bfb452009-04-06 19:01:30 -07001/*
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
Ryusuke Konishi49fa7a52009-11-14 16:44:22 +090032
33struct nilfs_ifile_info {
34 struct nilfs_mdt_info mi;
35 struct nilfs_palloc_cache palloc_cache;
36};
37
38static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
39{
40 return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
41}
42
Ryusuke Konishi43bfb452009-04-06 19:01:30 -070043/**
44 * nilfs_ifile_create_inode - create a new disk inode
45 * @ifile: ifile inode
46 * @out_ino: pointer to a variable to store inode number
47 * @out_bh: buffer_head contains newly allocated disk inode
48 *
49 * Return Value: On success, 0 is returned and the newly allocated inode
50 * number is stored in the place pointed by @ino, and buffer_head pointer
51 * that contains newly allocated disk inode structure is stored in the
52 * place pointed by @out_bh
53 * On error, one of the following negative error codes is returned.
54 *
55 * %-EIO - I/O error.
56 *
57 * %-ENOMEM - Insufficient amount of memory available.
58 *
59 * %-ENOSPC - No inode left.
60 */
61int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
62 struct buffer_head **out_bh)
63{
64 struct nilfs_palloc_req req;
65 int ret;
66
67 req.pr_entry_nr = 0; /* 0 says find free inode from beginning of
68 a group. dull code!! */
69 req.pr_entry_bh = NULL;
70
71 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
72 if (!ret) {
73 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
74 &req.pr_entry_bh);
75 if (ret < 0)
76 nilfs_palloc_abort_alloc_entry(ifile, &req);
77 }
78 if (ret < 0) {
79 brelse(req.pr_entry_bh);
80 return ret;
81 }
82 nilfs_palloc_commit_alloc_entry(ifile, &req);
83 nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
84 nilfs_mdt_mark_dirty(ifile);
85 *out_ino = (ino_t)req.pr_entry_nr;
86 *out_bh = req.pr_entry_bh;
87 return 0;
88}
89
90/**
91 * nilfs_ifile_delete_inode - delete a disk inode
92 * @ifile: ifile inode
93 * @ino: inode number
94 *
95 * Return Value: On success, 0 is returned. On error, one of the following
96 * negative error codes is returned.
97 *
98 * %-EIO - I/O error.
99 *
100 * %-ENOMEM - Insufficient amount of memory available.
101 *
102 * %-ENOENT - The inode number @ino have not been allocated.
103 */
104int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
105{
106 struct nilfs_palloc_req req = {
107 .pr_entry_nr = ino, .pr_entry_bh = NULL
108 };
109 struct nilfs_inode *raw_inode;
110 void *kaddr;
111 int ret;
112
113 ret = nilfs_palloc_prepare_free_entry(ifile, &req);
114 if (!ret) {
115 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
116 &req.pr_entry_bh);
117 if (ret < 0)
118 nilfs_palloc_abort_free_entry(ifile, &req);
119 }
120 if (ret < 0) {
121 brelse(req.pr_entry_bh);
122 return ret;
123 }
124
125 kaddr = kmap_atomic(req.pr_entry_bh->b_page, KM_USER0);
126 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
127 req.pr_entry_bh, kaddr);
128 raw_inode->i_flags = 0;
129 kunmap_atomic(kaddr, KM_USER0);
130
131 nilfs_mdt_mark_buffer_dirty(req.pr_entry_bh);
132 brelse(req.pr_entry_bh);
133
134 nilfs_palloc_commit_free_entry(ifile, &req);
135
136 return 0;
137}
138
139int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
140 struct buffer_head **out_bh)
141{
142 struct super_block *sb = ifile->i_sb;
143 int err;
144
145 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
146 nilfs_error(sb, __func__, "bad inode number: %lu",
147 (unsigned long) ino);
148 return -EINVAL;
149 }
150
151 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
152 if (unlikely(err)) {
153 if (err == -EINVAL)
154 nilfs_error(sb, __func__, "ifile is broken");
155 else
156 nilfs_warning(sb, __func__,
157 "unable to read inode: %lu",
158 (unsigned long) ino);
159 }
160 return err;
161}
Ryusuke Konishi79739562009-11-12 23:56:43 +0900162
163/**
164 * nilfs_ifile_new - create inode file
165 * @sbi: nilfs_sb_info struct
166 * @inode_size: size of an inode
167 */
168struct inode *nilfs_ifile_new(struct nilfs_sb_info *sbi, size_t inode_size)
169{
170 struct inode *ifile;
171 int err;
172
Ryusuke Konishi49fa7a52009-11-14 16:44:22 +0900173 ifile = nilfs_mdt_new(sbi->s_nilfs, sbi->s_super, NILFS_IFILE_INO,
174 sizeof(struct nilfs_ifile_info));
Ryusuke Konishi79739562009-11-12 23:56:43 +0900175 if (ifile) {
176 err = nilfs_palloc_init_blockgroup(ifile, inode_size);
177 if (unlikely(err)) {
178 nilfs_mdt_destroy(ifile);
179 return NULL;
180 }
Ryusuke Konishi49fa7a52009-11-14 16:44:22 +0900181 nilfs_palloc_setup_cache(ifile,
182 &NILFS_IFILE_I(ifile)->palloc_cache);
Ryusuke Konishi79739562009-11-12 23:56:43 +0900183 }
184 return ifile;
185}