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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 * Written by Amagai Yoshiji.
17 * Revised by Ryusuke Konishi.
18 *
19 */
20
21#include <linux/types.h>
22#include <linux/buffer_head.h>
23#include "nilfs.h"
24#include "mdt.h"
25#include "alloc.h"
26#include "ifile.h"
27
28/**
29 * struct nilfs_ifile_info - on-memory private data of ifile
30 * @mi: on-memory private data of metadata file
31 * @palloc_cache: persistent object allocator cache of ifile
32 */
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
43/**
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; /*
68 * 0 says find free inode from beginning
69 * of a group. dull code!!
70 */
71 req.pr_entry_bh = NULL;
72
73 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
74 if (!ret) {
75 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
76 &req.pr_entry_bh);
77 if (ret < 0)
78 nilfs_palloc_abort_alloc_entry(ifile, &req);
79 }
80 if (ret < 0) {
81 brelse(req.pr_entry_bh);
82 return ret;
83 }
84 nilfs_palloc_commit_alloc_entry(ifile, &req);
85 mark_buffer_dirty(req.pr_entry_bh);
86 nilfs_mdt_mark_dirty(ifile);
87 *out_ino = (ino_t)req.pr_entry_nr;
88 *out_bh = req.pr_entry_bh;
89 return 0;
90}
91
92/**
93 * nilfs_ifile_delete_inode - delete a disk inode
94 * @ifile: ifile inode
95 * @ino: inode number
96 *
97 * Return Value: On success, 0 is returned. On error, one of the following
98 * negative error codes is returned.
99 *
100 * %-EIO - I/O error.
101 *
102 * %-ENOMEM - Insufficient amount of memory available.
103 *
104 * %-ENOENT - The inode number @ino have not been allocated.
105 */
106int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
107{
108 struct nilfs_palloc_req req = {
109 .pr_entry_nr = ino, .pr_entry_bh = NULL
110 };
111 struct nilfs_inode *raw_inode;
112 void *kaddr;
113 int ret;
114
115 ret = nilfs_palloc_prepare_free_entry(ifile, &req);
116 if (!ret) {
117 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
118 &req.pr_entry_bh);
119 if (ret < 0)
120 nilfs_palloc_abort_free_entry(ifile, &req);
121 }
122 if (ret < 0) {
123 brelse(req.pr_entry_bh);
124 return ret;
125 }
126
127 kaddr = kmap_atomic(req.pr_entry_bh->b_page);
128 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
129 req.pr_entry_bh, kaddr);
130 raw_inode->i_flags = 0;
131 kunmap_atomic(kaddr);
132
133 mark_buffer_dirty(req.pr_entry_bh);
134 brelse(req.pr_entry_bh);
135
136 nilfs_palloc_commit_free_entry(ifile, &req);
137
138 return 0;
139}
140
141int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
142 struct buffer_head **out_bh)
143{
144 struct super_block *sb = ifile->i_sb;
145 int err;
146
147 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
148 nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
149 return -EINVAL;
150 }
151
152 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
153 if (unlikely(err))
154 nilfs_msg(sb, KERN_WARNING, "error %d reading inode: ino=%lu",
155 err, (unsigned long)ino);
156 return err;
157}
158
159/**
160 * nilfs_ifile_count_free_inodes - calculate free inodes count
161 * @ifile: ifile inode
162 * @nmaxinodes: current maximum of available inodes count [out]
163 * @nfreeinodes: free inodes count [out]
164 */
165int nilfs_ifile_count_free_inodes(struct inode *ifile,
166 u64 *nmaxinodes, u64 *nfreeinodes)
167{
168 u64 nused;
169 int err;
170
171 *nmaxinodes = 0;
172 *nfreeinodes = 0;
173
174 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
175 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
176 if (likely(!err))
177 *nfreeinodes = *nmaxinodes - nused;
178 return err;
179}
180
181/**
182 * nilfs_ifile_read - read or get ifile inode
183 * @sb: super block instance
184 * @root: root object
185 * @inode_size: size of an inode
186 * @raw_inode: on-disk ifile inode
187 * @inodep: buffer to store the inode
188 */
189int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
190 size_t inode_size, struct nilfs_inode *raw_inode,
191 struct inode **inodep)
192{
193 struct inode *ifile;
194 int err;
195
196 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
197 if (unlikely(!ifile))
198 return -ENOMEM;
199 if (!(ifile->i_state & I_NEW))
200 goto out;
201
202 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
203 sizeof(struct nilfs_ifile_info));
204 if (err)
205 goto failed;
206
207 err = nilfs_palloc_init_blockgroup(ifile, inode_size);
208 if (err)
209 goto failed;
210
211 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
212
213 err = nilfs_read_inode_common(ifile, raw_inode);
214 if (err)
215 goto failed;
216
217 unlock_new_inode(ifile);
218 out:
219 *inodep = ifile;
220 return 0;
221 failed:
222 iget_failed(ifile);
223 return err;
224}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS inode file
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Amagai Yoshiji.
8 * Revised by Ryusuke Konishi.
9 *
10 */
11
12#include <linux/types.h>
13#include <linux/buffer_head.h>
14#include "nilfs.h"
15#include "mdt.h"
16#include "alloc.h"
17#include "ifile.h"
18
19/**
20 * struct nilfs_ifile_info - on-memory private data of ifile
21 * @mi: on-memory private data of metadata file
22 * @palloc_cache: persistent object allocator cache of ifile
23 */
24struct nilfs_ifile_info {
25 struct nilfs_mdt_info mi;
26 struct nilfs_palloc_cache palloc_cache;
27};
28
29static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
30{
31 return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
32}
33
34/**
35 * nilfs_ifile_create_inode - create a new disk inode
36 * @ifile: ifile inode
37 * @out_ino: pointer to a variable to store inode number
38 * @out_bh: buffer_head contains newly allocated disk inode
39 *
40 * Return Value: On success, 0 is returned and the newly allocated inode
41 * number is stored in the place pointed by @ino, and buffer_head pointer
42 * that contains newly allocated disk inode structure is stored in the
43 * place pointed by @out_bh
44 * On error, one of the following negative error codes is returned.
45 *
46 * %-EIO - I/O error.
47 *
48 * %-ENOMEM - Insufficient amount of memory available.
49 *
50 * %-ENOSPC - No inode left.
51 */
52int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
53 struct buffer_head **out_bh)
54{
55 struct nilfs_palloc_req req;
56 int ret;
57
58 req.pr_entry_nr = 0; /*
59 * 0 says find free inode from beginning
60 * of a group. dull code!!
61 */
62 req.pr_entry_bh = NULL;
63
64 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
65 if (!ret) {
66 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
67 &req.pr_entry_bh);
68 if (ret < 0)
69 nilfs_palloc_abort_alloc_entry(ifile, &req);
70 }
71 if (ret < 0) {
72 brelse(req.pr_entry_bh);
73 return ret;
74 }
75 nilfs_palloc_commit_alloc_entry(ifile, &req);
76 mark_buffer_dirty(req.pr_entry_bh);
77 nilfs_mdt_mark_dirty(ifile);
78 *out_ino = (ino_t)req.pr_entry_nr;
79 *out_bh = req.pr_entry_bh;
80 return 0;
81}
82
83/**
84 * nilfs_ifile_delete_inode - delete a disk inode
85 * @ifile: ifile inode
86 * @ino: inode number
87 *
88 * Return Value: On success, 0 is returned. On error, one of the following
89 * negative error codes is returned.
90 *
91 * %-EIO - I/O error.
92 *
93 * %-ENOMEM - Insufficient amount of memory available.
94 *
95 * %-ENOENT - The inode number @ino have not been allocated.
96 */
97int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
98{
99 struct nilfs_palloc_req req = {
100 .pr_entry_nr = ino, .pr_entry_bh = NULL
101 };
102 struct nilfs_inode *raw_inode;
103 void *kaddr;
104 int ret;
105
106 ret = nilfs_palloc_prepare_free_entry(ifile, &req);
107 if (!ret) {
108 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
109 &req.pr_entry_bh);
110 if (ret < 0)
111 nilfs_palloc_abort_free_entry(ifile, &req);
112 }
113 if (ret < 0) {
114 brelse(req.pr_entry_bh);
115 return ret;
116 }
117
118 kaddr = kmap_atomic(req.pr_entry_bh->b_page);
119 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
120 req.pr_entry_bh, kaddr);
121 raw_inode->i_flags = 0;
122 kunmap_atomic(kaddr);
123
124 mark_buffer_dirty(req.pr_entry_bh);
125 brelse(req.pr_entry_bh);
126
127 nilfs_palloc_commit_free_entry(ifile, &req);
128
129 return 0;
130}
131
132int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
133 struct buffer_head **out_bh)
134{
135 struct super_block *sb = ifile->i_sb;
136 int err;
137
138 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
139 nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
140 return -EINVAL;
141 }
142
143 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
144 if (unlikely(err))
145 nilfs_warn(sb, "error %d reading inode: ino=%lu",
146 err, (unsigned long)ino);
147 return err;
148}
149
150/**
151 * nilfs_ifile_count_free_inodes - calculate free inodes count
152 * @ifile: ifile inode
153 * @nmaxinodes: current maximum of available inodes count [out]
154 * @nfreeinodes: free inodes count [out]
155 */
156int nilfs_ifile_count_free_inodes(struct inode *ifile,
157 u64 *nmaxinodes, u64 *nfreeinodes)
158{
159 u64 nused;
160 int err;
161
162 *nmaxinodes = 0;
163 *nfreeinodes = 0;
164
165 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
166 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
167 if (likely(!err))
168 *nfreeinodes = *nmaxinodes - nused;
169 return err;
170}
171
172/**
173 * nilfs_ifile_read - read or get ifile inode
174 * @sb: super block instance
175 * @root: root object
176 * @inode_size: size of an inode
177 * @raw_inode: on-disk ifile inode
178 * @inodep: buffer to store the inode
179 */
180int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
181 size_t inode_size, struct nilfs_inode *raw_inode,
182 struct inode **inodep)
183{
184 struct inode *ifile;
185 int err;
186
187 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
188 if (unlikely(!ifile))
189 return -ENOMEM;
190 if (!(ifile->i_state & I_NEW))
191 goto out;
192
193 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
194 sizeof(struct nilfs_ifile_info));
195 if (err)
196 goto failed;
197
198 err = nilfs_palloc_init_blockgroup(ifile, inode_size);
199 if (err)
200 goto failed;
201
202 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
203
204 err = nilfs_read_inode_common(ifile, raw_inode);
205 if (err)
206 goto failed;
207
208 unlock_new_inode(ifile);
209 out:
210 *inodep = ifile;
211 return 0;
212 failed:
213 iget_failed(ifile);
214 return err;
215}