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 */
24 struct nilfs_ifile_info {
25 struct nilfs_mdt_info mi;
26 struct nilfs_palloc_cache palloc_cache;
27 };
28
NILFS_IFILE_I(struct inode * ifile)29 static 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 */
nilfs_ifile_create_inode(struct inode * ifile,ino_t * out_ino,struct buffer_head ** out_bh)52 int 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 = NILFS_FIRST_INO(ifile->i_sb);
59 req.pr_entry_bh = NULL;
60
61 ret = nilfs_palloc_prepare_alloc_entry(ifile, &req, false);
62 if (!ret) {
63 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
64 &req.pr_entry_bh);
65 if (ret < 0)
66 nilfs_palloc_abort_alloc_entry(ifile, &req);
67 }
68 if (ret < 0) {
69 brelse(req.pr_entry_bh);
70 return ret;
71 }
72 nilfs_palloc_commit_alloc_entry(ifile, &req);
73 mark_buffer_dirty(req.pr_entry_bh);
74 nilfs_mdt_mark_dirty(ifile);
75 *out_ino = (ino_t)req.pr_entry_nr;
76 *out_bh = req.pr_entry_bh;
77 return 0;
78 }
79
80 /**
81 * nilfs_ifile_delete_inode - delete a disk inode
82 * @ifile: ifile inode
83 * @ino: inode number
84 *
85 * Return Value: On success, 0 is returned. On error, one of the following
86 * negative error codes is returned.
87 *
88 * %-EIO - I/O error.
89 *
90 * %-ENOMEM - Insufficient amount of memory available.
91 *
92 * %-ENOENT - The inode number @ino have not been allocated.
93 */
nilfs_ifile_delete_inode(struct inode * ifile,ino_t ino)94 int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
95 {
96 struct nilfs_palloc_req req = {
97 .pr_entry_nr = ino, .pr_entry_bh = NULL
98 };
99 struct nilfs_inode *raw_inode;
100 void *kaddr;
101 int ret;
102
103 ret = nilfs_palloc_prepare_free_entry(ifile, &req);
104 if (!ret) {
105 ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
106 &req.pr_entry_bh);
107 if (ret < 0)
108 nilfs_palloc_abort_free_entry(ifile, &req);
109 }
110 if (ret < 0) {
111 brelse(req.pr_entry_bh);
112 return ret;
113 }
114
115 kaddr = kmap_atomic(req.pr_entry_bh->b_page);
116 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
117 req.pr_entry_bh, kaddr);
118 raw_inode->i_flags = 0;
119 kunmap_atomic(kaddr);
120
121 mark_buffer_dirty(req.pr_entry_bh);
122 brelse(req.pr_entry_bh);
123
124 nilfs_palloc_commit_free_entry(ifile, &req);
125
126 return 0;
127 }
128
nilfs_ifile_get_inode_block(struct inode * ifile,ino_t ino,struct buffer_head ** out_bh)129 int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
130 struct buffer_head **out_bh)
131 {
132 struct super_block *sb = ifile->i_sb;
133 int err;
134
135 if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
136 nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
137 return -EINVAL;
138 }
139
140 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
141 if (unlikely(err))
142 nilfs_warn(sb, "error %d reading inode: ino=%lu",
143 err, (unsigned long)ino);
144 return err;
145 }
146
147 /**
148 * nilfs_ifile_count_free_inodes - calculate free inodes count
149 * @ifile: ifile inode
150 * @nmaxinodes: current maximum of available inodes count [out]
151 * @nfreeinodes: free inodes count [out]
152 */
nilfs_ifile_count_free_inodes(struct inode * ifile,u64 * nmaxinodes,u64 * nfreeinodes)153 int nilfs_ifile_count_free_inodes(struct inode *ifile,
154 u64 *nmaxinodes, u64 *nfreeinodes)
155 {
156 u64 nused;
157 int err;
158
159 *nmaxinodes = 0;
160 *nfreeinodes = 0;
161
162 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
163 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
164 if (likely(!err))
165 *nfreeinodes = *nmaxinodes - nused;
166 return err;
167 }
168
169 /**
170 * nilfs_ifile_read - read or get ifile inode
171 * @sb: super block instance
172 * @root: root object
173 * @inode_size: size of an inode
174 * @raw_inode: on-disk ifile inode
175 * @inodep: buffer to store the inode
176 */
nilfs_ifile_read(struct super_block * sb,struct nilfs_root * root,size_t inode_size,struct nilfs_inode * raw_inode,struct inode ** inodep)177 int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
178 size_t inode_size, struct nilfs_inode *raw_inode,
179 struct inode **inodep)
180 {
181 struct inode *ifile;
182 int err;
183
184 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
185 if (unlikely(!ifile))
186 return -ENOMEM;
187 if (!(ifile->i_state & I_NEW))
188 goto out;
189
190 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
191 sizeof(struct nilfs_ifile_info));
192 if (err)
193 goto failed;
194
195 err = nilfs_palloc_init_blockgroup(ifile, inode_size);
196 if (err)
197 goto failed;
198
199 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
200
201 err = nilfs_read_inode_common(ifile, raw_inode);
202 if (err)
203 goto failed;
204
205 unlock_new_inode(ifile);
206 out:
207 *inodep = ifile;
208 return 0;
209 failed:
210 iget_failed(ifile);
211 return err;
212 }
213