blob: 1d2b1805327a0c8886927a16b00f69e8db8ef96c [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 *
Ryusuke Konishi4b420ab2016-05-23 16:23:09 -070016 * Written by Amagai Yoshiji.
17 * Revised by Ryusuke Konishi.
Ryusuke Konishi43bfb452009-04-06 19:01:30 -070018 *
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
Vyacheslav Dubeykof5974c82012-07-30 14:42:10 -070028/**
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 */
Ryusuke Konishi49fa7a52009-11-14 16:44:22 +090033struct 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
Ryusuke Konishi076a3782016-05-23 16:23:48 -070067 req.pr_entry_nr = 0; /*
68 * 0 says find free inode from beginning
69 * of a group. dull code!!
70 */
Ryusuke Konishi43bfb452009-04-06 19:01:30 -070071 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);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +090085 mark_buffer_dirty(req.pr_entry_bh);
Ryusuke Konishi43bfb452009-04-06 19:01:30 -070086 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
Cong Wang7b9c0972011-11-25 23:14:33 +0800127 kaddr = kmap_atomic(req.pr_entry_bh->b_page);
Ryusuke Konishi43bfb452009-04-06 19:01:30 -0700128 raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
129 req.pr_entry_bh, kaddr);
130 raw_inode->i_flags = 0;
Cong Wang7b9c0972011-11-25 23:14:33 +0800131 kunmap_atomic(kaddr);
Ryusuke Konishi43bfb452009-04-06 19:01:30 -0700132
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900133 mark_buffer_dirty(req.pr_entry_bh);
Ryusuke Konishi43bfb452009-04-06 19:01:30 -0700134 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, __func__, "bad inode number: %lu",
149 (unsigned long) ino);
150 return -EINVAL;
151 }
152
153 err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
Ryusuke Konishie8289492010-11-19 15:26:20 +0900154 if (unlikely(err))
155 nilfs_warning(sb, __func__, "unable to read inode: %lu",
156 (unsigned long) ino);
Ryusuke Konishi43bfb452009-04-06 19:01:30 -0700157 return err;
158}
Ryusuke Konishi79739562009-11-12 23:56:43 +0900159
160/**
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700161 * nilfs_ifile_count_free_inodes - calculate free inodes count
162 * @ifile: ifile inode
163 * @nmaxinodes: current maximum of available inodes count [out]
164 * @nfreeinodes: free inodes count [out]
165 */
166int nilfs_ifile_count_free_inodes(struct inode *ifile,
167 u64 *nmaxinodes, u64 *nfreeinodes)
168{
169 u64 nused;
170 int err;
171
172 *nmaxinodes = 0;
173 *nfreeinodes = 0;
174
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700175 nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700176 err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
177 if (likely(!err))
178 *nfreeinodes = *nmaxinodes - nused;
179 return err;
180}
181
182/**
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900183 * nilfs_ifile_read - read or get ifile inode
184 * @sb: super block instance
185 * @root: root object
Ryusuke Konishi79739562009-11-12 23:56:43 +0900186 * @inode_size: size of an inode
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900187 * @raw_inode: on-disk ifile inode
188 * @inodep: buffer to store the inode
Ryusuke Konishi79739562009-11-12 23:56:43 +0900189 */
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900190int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
191 size_t inode_size, struct nilfs_inode *raw_inode,
192 struct inode **inodep)
Ryusuke Konishi79739562009-11-12 23:56:43 +0900193{
194 struct inode *ifile;
195 int err;
196
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900197 ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
198 if (unlikely(!ifile))
199 return -ENOMEM;
200 if (!(ifile->i_state & I_NEW))
201 goto out;
202
203 err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
204 sizeof(struct nilfs_ifile_info));
205 if (err)
206 goto failed;
207
208 err = nilfs_palloc_init_blockgroup(ifile, inode_size);
209 if (err)
210 goto failed;
211
212 nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
213
214 err = nilfs_read_inode_common(ifile, raw_inode);
215 if (err)
216 goto failed;
217
218 unlock_new_inode(ifile);
219 out:
220 *inodep = ifile;
221 return 0;
222 failed:
223 iget_failed(ifile);
224 return err;
Ryusuke Konishi79739562009-11-12 23:56:43 +0900225}