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 */
25 struct nilfs_ifile_info {
26 struct nilfs_mdt_info mi;
27 struct nilfs_palloc_cache palloc_cache;
28 };
29
30 static 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 */
53 int 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 */
95 int 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 void *kaddr;
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 kaddr = kmap_local_page(req.pr_entry_bh->b_page);
117 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
118 req.pr_entry_bh, kaddr);
119 raw_inode->i_flags = 0;
120 kunmap_local(kaddr);
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
130 int 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 */
154 int 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 */
182 int 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 }
218
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.