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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#include "cpfile.h"
19
20/**
21 * struct nilfs_ifile_info - on-memory private data of ifile
22 * @mi: on-memory private data of metadata file
23 * @palloc_cache: persistent object allocator cache of ifile
24 */
25struct nilfs_ifile_info {
26 struct nilfs_mdt_info mi;
27 struct nilfs_palloc_cache palloc_cache;
28};
29
30static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
31{
32 return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
33}
34
35/**
36 * nilfs_ifile_create_inode - create a new disk inode
37 * @ifile: ifile inode
38 * @out_ino: pointer to a variable to store inode number
39 * @out_bh: buffer_head contains newly allocated disk inode
40 *
41 * Return Value: On success, 0 is returned and the newly allocated inode
42 * number is stored in the place pointed by @ino, and buffer_head pointer
43 * that contains newly allocated disk inode structure is stored in the
44 * place pointed by @out_bh
45 * On error, one of the following negative error codes is returned.
46 *
47 * %-EIO - I/O error.
48 *
49 * %-ENOMEM - Insufficient amount of memory available.
50 *
51 * %-ENOSPC - No inode left.
52 */
53int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
54 struct buffer_head **out_bh)
55{
56 struct nilfs_palloc_req req;
57 int ret;
58
59 req.pr_entry_nr = NILFS_FIRST_INO(ifile->i_sb);
60 req.pr_entry_bh = NULL;
61
62 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req, false);
63 if (!ret) {
64 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
65 &req.pr_entry_bh);
66 if (ret < 0)
67 nilfs_palloc_abort_alloc_entry(ifile, &req);
68 }
69 if (ret < 0) {
70 brelse(req.pr_entry_bh);
71 return ret;
72 }
73 nilfs_palloc_commit_alloc_entry(ifile, &req);
74 mark_buffer_dirty(req.pr_entry_bh);
75 nilfs_mdt_mark_dirty(ifile);
76 *out_ino = (ino_t)req.pr_entry_nr;
77 *out_bh = req.pr_entry_bh;
78 return 0;
79}
80
81/**
82 * nilfs_ifile_delete_inode - delete a disk inode
83 * @ifile: ifile inode
84 * @ino: inode number
85 *
86 * Return Value: On success, 0 is returned. On error, one of the following
87 * negative error codes is returned.
88 *
89 * %-EIO - I/O error.
90 *
91 * %-ENOMEM - Insufficient amount of memory available.
92 *
93 * %-ENOENT - The inode number @ino have not been allocated.
94 */
95int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
96{
97 struct nilfs_palloc_req req = {
98 .pr_entry_nr = ino, .pr_entry_bh = NULL
99 };
100 struct nilfs_inode *raw_inode;
101 size_t offset;
102 int ret;
103
104 ret = nilfs_palloc_prepare_free_entry(ifile, &req);
105 if (!ret) {
106 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
107 &req.pr_entry_bh);
108 if (ret < 0)
109 nilfs_palloc_abort_free_entry(ifile, &req);
110 }
111 if (ret < 0) {
112 brelse(req.pr_entry_bh);
113 return ret;
114 }
115
116 offset = nilfs_palloc_entry_offset(ifile, req.pr_entry_nr,
117 req.pr_entry_bh);
118 raw_inode = kmap_local_folio(req.pr_entry_bh->b_folio, offset);
119 raw_inode->i_flags = 0;
120 kunmap_local(raw_inode);
121
122 mark_buffer_dirty(req.pr_entry_bh);
123 brelse(req.pr_entry_bh);
124
125 nilfs_palloc_commit_free_entry(ifile, &req);
126
127 return 0;
128}
129
130int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
131 struct buffer_head **out_bh)
132{
133 struct super_block *sb = ifile->i_sb;
134 int err;
135
136 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
137 nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
138 return -EINVAL;
139 }
140
141 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
142 if (unlikely(err))
143 nilfs_warn(sb, "error %d reading inode: ino=%lu",
144 err, (unsigned long)ino);
145 return err;
146}
147
148/**
149 * nilfs_ifile_count_free_inodes - calculate free inodes count
150 * @ifile: ifile inode
151 * @nmaxinodes: current maximum of available inodes count [out]
152 * @nfreeinodes: free inodes count [out]
153 */
154int nilfs_ifile_count_free_inodes(struct inode *ifile,
155 u64 *nmaxinodes, u64 *nfreeinodes)
156{
157 u64 nused;
158 int err;
159
160 *nmaxinodes = 0;
161 *nfreeinodes = 0;
162
163 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
164 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
165 if (likely(!err))
166 *nfreeinodes = *nmaxinodes - nused;
167 return err;
168}
169
170/**
171 * nilfs_ifile_read - read or get ifile inode
172 * @sb: super block instance
173 * @root: root object
174 * @cno: number of checkpoint entry to read
175 * @inode_size: size of an inode
176 *
177 * Return: 0 on success, or the following negative error code on failure.
178 * * %-EINVAL - Invalid checkpoint.
179 * * %-ENOMEM - Insufficient memory available.
180 * * %-EIO - I/O error (including metadata corruption).
181 */
182int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
183 __u64 cno, size_t inode_size)
184{
185 struct the_nilfs *nilfs;
186 struct inode *ifile;
187 int err;
188
189 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
190 if (unlikely(!ifile))
191 return -ENOMEM;
192 if (!(ifile->i_state & I_NEW))
193 goto out;
194
195 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
196 sizeof(struct nilfs_ifile_info));
197 if (err)
198 goto failed;
199
200 err = nilfs_palloc_init_blockgroup(ifile, inode_size);
201 if (err)
202 goto failed;
203
204 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
205
206 nilfs = sb->s_fs_info;
207 err = nilfs_cpfile_read_checkpoint(nilfs->ns_cpfile, cno, root, ifile);
208 if (err)
209 goto failed;
210
211 unlock_new_inode(ifile);
212 out:
213 return 0;
214 failed:
215 iget_failed(ifile);
216 return err;
217}