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43bfb45e RK |
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 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Amagai Yoshiji <amagai@osrg.net>. | |
21 | * Revised by Ryusuke Konishi <ryusuke@osrg.net>. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/types.h> | |
26 | #include <linux/buffer_head.h> | |
27 | #include "nilfs.h" | |
28 | #include "mdt.h" | |
29 | #include "alloc.h" | |
30 | #include "ifile.h" | |
31 | ||
f5974c8f VD |
32 | /** |
33 | * struct nilfs_ifile_info - on-memory private data of ifile | |
34 | * @mi: on-memory private data of metadata file | |
35 | * @palloc_cache: persistent object allocator cache of ifile | |
36 | */ | |
49fa7a59 RK |
37 | struct nilfs_ifile_info { |
38 | struct nilfs_mdt_info mi; | |
39 | struct nilfs_palloc_cache palloc_cache; | |
40 | }; | |
41 | ||
42 | static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile) | |
43 | { | |
44 | return (struct nilfs_ifile_info *)NILFS_MDT(ifile); | |
45 | } | |
46 | ||
43bfb45e RK |
47 | /** |
48 | * nilfs_ifile_create_inode - create a new disk inode | |
49 | * @ifile: ifile inode | |
50 | * @out_ino: pointer to a variable to store inode number | |
51 | * @out_bh: buffer_head contains newly allocated disk inode | |
52 | * | |
53 | * Return Value: On success, 0 is returned and the newly allocated inode | |
54 | * number is stored in the place pointed by @ino, and buffer_head pointer | |
55 | * that contains newly allocated disk inode structure is stored in the | |
56 | * place pointed by @out_bh | |
57 | * On error, one of the following negative error codes is returned. | |
58 | * | |
59 | * %-EIO - I/O error. | |
60 | * | |
61 | * %-ENOMEM - Insufficient amount of memory available. | |
62 | * | |
63 | * %-ENOSPC - No inode left. | |
64 | */ | |
65 | int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino, | |
66 | struct buffer_head **out_bh) | |
67 | { | |
68 | struct nilfs_palloc_req req; | |
69 | int ret; | |
70 | ||
71 | req.pr_entry_nr = 0; /* 0 says find free inode from beginning of | |
72 | a group. dull code!! */ | |
73 | req.pr_entry_bh = NULL; | |
74 | ||
75 | ret = nilfs_palloc_prepare_alloc_entry(ifile, &req); | |
76 | if (!ret) { | |
77 | ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1, | |
78 | &req.pr_entry_bh); | |
79 | if (ret < 0) | |
80 | nilfs_palloc_abort_alloc_entry(ifile, &req); | |
81 | } | |
82 | if (ret < 0) { | |
83 | brelse(req.pr_entry_bh); | |
84 | return ret; | |
85 | } | |
86 | nilfs_palloc_commit_alloc_entry(ifile, &req); | |
5fc7b141 | 87 | mark_buffer_dirty(req.pr_entry_bh); |
43bfb45e RK |
88 | nilfs_mdt_mark_dirty(ifile); |
89 | *out_ino = (ino_t)req.pr_entry_nr; | |
90 | *out_bh = req.pr_entry_bh; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /** | |
95 | * nilfs_ifile_delete_inode - delete a disk inode | |
96 | * @ifile: ifile inode | |
97 | * @ino: inode number | |
98 | * | |
99 | * Return Value: On success, 0 is returned. On error, one of the following | |
100 | * negative error codes is returned. | |
101 | * | |
102 | * %-EIO - I/O error. | |
103 | * | |
104 | * %-ENOMEM - Insufficient amount of memory available. | |
105 | * | |
106 | * %-ENOENT - The inode number @ino have not been allocated. | |
107 | */ | |
108 | int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino) | |
109 | { | |
110 | struct nilfs_palloc_req req = { | |
111 | .pr_entry_nr = ino, .pr_entry_bh = NULL | |
112 | }; | |
113 | struct nilfs_inode *raw_inode; | |
114 | void *kaddr; | |
115 | int ret; | |
116 | ||
117 | ret = nilfs_palloc_prepare_free_entry(ifile, &req); | |
118 | if (!ret) { | |
119 | ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0, | |
120 | &req.pr_entry_bh); | |
121 | if (ret < 0) | |
122 | nilfs_palloc_abort_free_entry(ifile, &req); | |
123 | } | |
124 | if (ret < 0) { | |
125 | brelse(req.pr_entry_bh); | |
126 | return ret; | |
127 | } | |
128 | ||
7b9c0976 | 129 | kaddr = kmap_atomic(req.pr_entry_bh->b_page); |
43bfb45e RK |
130 | raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr, |
131 | req.pr_entry_bh, kaddr); | |
132 | raw_inode->i_flags = 0; | |
7b9c0976 | 133 | kunmap_atomic(kaddr); |
43bfb45e | 134 | |
5fc7b141 | 135 | mark_buffer_dirty(req.pr_entry_bh); |
43bfb45e RK |
136 | brelse(req.pr_entry_bh); |
137 | ||
138 | nilfs_palloc_commit_free_entry(ifile, &req); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino, | |
144 | struct buffer_head **out_bh) | |
145 | { | |
146 | struct super_block *sb = ifile->i_sb; | |
147 | int err; | |
148 | ||
149 | if (unlikely(!NILFS_VALID_INODE(sb, ino))) { | |
150 | nilfs_error(sb, __func__, "bad inode number: %lu", | |
151 | (unsigned long) ino); | |
152 | return -EINVAL; | |
153 | } | |
154 | ||
155 | err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh); | |
e828949e RK |
156 | if (unlikely(err)) |
157 | nilfs_warning(sb, __func__, "unable to read inode: %lu", | |
158 | (unsigned long) ino); | |
43bfb45e RK |
159 | return err; |
160 | } | |
79739565 | 161 | |
c7ef972c VD |
162 | /** |
163 | * nilfs_ifile_count_free_inodes - calculate free inodes count | |
164 | * @ifile: ifile inode | |
165 | * @nmaxinodes: current maximum of available inodes count [out] | |
166 | * @nfreeinodes: free inodes count [out] | |
167 | */ | |
168 | int nilfs_ifile_count_free_inodes(struct inode *ifile, | |
169 | u64 *nmaxinodes, u64 *nfreeinodes) | |
170 | { | |
171 | u64 nused; | |
172 | int err; | |
173 | ||
174 | *nmaxinodes = 0; | |
175 | *nfreeinodes = 0; | |
176 | ||
e5f7f848 | 177 | nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count); |
c7ef972c VD |
178 | err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes); |
179 | if (likely(!err)) | |
180 | *nfreeinodes = *nmaxinodes - nused; | |
181 | return err; | |
182 | } | |
183 | ||
79739565 | 184 | /** |
f1e89c86 RK |
185 | * nilfs_ifile_read - read or get ifile inode |
186 | * @sb: super block instance | |
187 | * @root: root object | |
79739565 | 188 | * @inode_size: size of an inode |
f1e89c86 RK |
189 | * @raw_inode: on-disk ifile inode |
190 | * @inodep: buffer to store the inode | |
79739565 | 191 | */ |
f1e89c86 RK |
192 | int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root, |
193 | size_t inode_size, struct nilfs_inode *raw_inode, | |
194 | struct inode **inodep) | |
79739565 RK |
195 | { |
196 | struct inode *ifile; | |
197 | int err; | |
198 | ||
f1e89c86 RK |
199 | ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO); |
200 | if (unlikely(!ifile)) | |
201 | return -ENOMEM; | |
202 | if (!(ifile->i_state & I_NEW)) | |
203 | goto out; | |
204 | ||
205 | err = nilfs_mdt_init(ifile, NILFS_MDT_GFP, | |
206 | sizeof(struct nilfs_ifile_info)); | |
207 | if (err) | |
208 | goto failed; | |
209 | ||
210 | err = nilfs_palloc_init_blockgroup(ifile, inode_size); | |
211 | if (err) | |
212 | goto failed; | |
213 | ||
214 | nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache); | |
215 | ||
216 | err = nilfs_read_inode_common(ifile, raw_inode); | |
217 | if (err) | |
218 | goto failed; | |
219 | ||
220 | unlock_new_inode(ifile); | |
221 | out: | |
222 | *inodep = ifile; | |
223 | return 0; | |
224 | failed: | |
225 | iget_failed(ifile); | |
226 | return err; | |
79739565 | 227 | } |