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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/fs.h> | |
9c74034f | 18 | #include <linux/err.h> |
1da177e4 LT |
19 | #include <linux/mount.h> |
20 | #include <linux/jffs2.h> | |
21 | #include <linux/pagemap.h> | |
acaebfd8 | 22 | #include <linux/mtd/super.h> |
1da177e4 LT |
23 | #include <linux/ctype.h> |
24 | #include <linux/namei.h> | |
5f556aab | 25 | #include <linux/exportfs.h> |
1da177e4 LT |
26 | #include "compr.h" |
27 | #include "nodelist.h" | |
28 | ||
29 | static void jffs2_put_super(struct super_block *); | |
30 | ||
e18b890b | 31 | static struct kmem_cache *jffs2_inode_cachep; |
1da177e4 LT |
32 | |
33 | static struct inode *jffs2_alloc_inode(struct super_block *sb) | |
34 | { | |
4e571aba DW |
35 | struct jffs2_inode_info *f; |
36 | ||
37 | f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); | |
38 | if (!f) | |
1da177e4 | 39 | return NULL; |
4e571aba | 40 | return &f->vfs_inode; |
1da177e4 LT |
41 | } |
42 | ||
43 | static void jffs2_destroy_inode(struct inode *inode) | |
44 | { | |
45 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); | |
46 | } | |
47 | ||
51cc5068 | 48 | static void jffs2_i_init_once(void *foo) |
1da177e4 | 49 | { |
4e571aba | 50 | struct jffs2_inode_info *f = foo; |
1da177e4 | 51 | |
4e571aba DW |
52 | mutex_init(&f->sem); |
53 | inode_init_once(&f->vfs_inode); | |
1da177e4 LT |
54 | } |
55 | ||
56 | static int jffs2_sync_fs(struct super_block *sb, int wait) | |
57 | { | |
58 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
59 | ||
ced22070 | 60 | mutex_lock(&c->alloc_sem); |
1da177e4 | 61 | jffs2_flush_wbuf_pad(c); |
ced22070 | 62 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
63 | return 0; |
64 | } | |
65 | ||
5f556aab DW |
66 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
67 | uint32_t generation) | |
68 | { | |
69 | /* We don't care about i_generation. We'll destroy the flash | |
70 | before we start re-using inode numbers anyway. And even | |
71 | if that wasn't true, we'd have other problems...*/ | |
72 | return jffs2_iget(sb, ino); | |
73 | } | |
74 | ||
75 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
76 | int fh_len, int fh_type) | |
77 | { | |
78 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
79 | jffs2_nfs_get_inode); | |
80 | } | |
81 | ||
82 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
83 | int fh_len, int fh_type) | |
84 | { | |
85 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
86 | jffs2_nfs_get_inode); | |
87 | } | |
88 | ||
89 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
90 | { | |
91 | struct jffs2_inode_info *f; | |
92 | uint32_t pino; | |
93 | ||
94 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); | |
95 | ||
96 | f = JFFS2_INODE_INFO(child->d_inode); | |
97 | ||
98 | pino = f->inocache->pino_nlink; | |
99 | ||
100 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
101 | f->inocache->ino, pino); | |
102 | ||
103 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); | |
104 | } | |
105 | ||
106 | static struct export_operations jffs2_export_ops = { | |
107 | .get_parent = jffs2_get_parent, | |
108 | .fh_to_dentry = jffs2_fh_to_dentry, | |
109 | .fh_to_parent = jffs2_fh_to_parent, | |
110 | }; | |
111 | ||
ee9b6d61 | 112 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
113 | { |
114 | .alloc_inode = jffs2_alloc_inode, | |
115 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 LT |
116 | .put_super = jffs2_put_super, |
117 | .write_super = jffs2_write_super, | |
118 | .statfs = jffs2_statfs, | |
119 | .remount_fs = jffs2_remount_fs, | |
120 | .clear_inode = jffs2_clear_inode, | |
121 | .dirty_inode = jffs2_dirty_inode, | |
122 | .sync_fs = jffs2_sync_fs, | |
123 | }; | |
124 | ||
acaebfd8 DH |
125 | /* |
126 | * fill in the superblock | |
127 | */ | |
128 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 129 | { |
1da177e4 | 130 | struct jffs2_sb_info *c; |
acaebfd8 DH |
131 | |
132 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():" | |
133 | " New superblock for device %d (\"%s\")\n", | |
134 | sb->s_mtd->index, sb->s_mtd->name)); | |
1da177e4 | 135 | |
f8314dc6 | 136 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1da177e4 | 137 | if (!c) |
454e2398 | 138 | return -ENOMEM; |
1da177e4 | 139 | |
acaebfd8 DH |
140 | c->mtd = sb->s_mtd; |
141 | c->os_priv = sb; | |
142 | sb->s_fs_info = c; | |
1da177e4 | 143 | |
acaebfd8 DH |
144 | /* Initialize JFFS2 superblock locks, the further initialization will |
145 | * be done later */ | |
ced22070 DW |
146 | mutex_init(&c->alloc_sem); |
147 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
148 | init_waitqueue_head(&c->erase_wait); |
149 | init_waitqueue_head(&c->inocache_wq); | |
150 | spin_lock_init(&c->erase_completion_lock); | |
151 | spin_lock_init(&c->inocache_lock); | |
152 | ||
1da177e4 | 153 | sb->s_op = &jffs2_super_operations; |
5f556aab | 154 | sb->s_export_op = &jffs2_export_ops; |
acaebfd8 | 155 | sb->s_flags = sb->s_flags | MS_NOATIME; |
aa98d7cf KK |
156 | sb->s_xattr = jffs2_xattr_handlers; |
157 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
158 | sb->s_flags |= MS_POSIXACL; | |
159 | #endif | |
acaebfd8 | 160 | return jffs2_do_fill_super(sb, data, silent); |
1da177e4 LT |
161 | } |
162 | ||
454e2398 DH |
163 | static int jffs2_get_sb(struct file_system_type *fs_type, |
164 | int flags, const char *dev_name, | |
165 | void *data, struct vfsmount *mnt) | |
1da177e4 | 166 | { |
acaebfd8 DH |
167 | return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super, |
168 | mnt); | |
1da177e4 LT |
169 | } |
170 | ||
171 | static void jffs2_put_super (struct super_block *sb) | |
172 | { | |
173 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
174 | ||
175 | D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); | |
176 | ||
8c85e125 CH |
177 | if (sb->s_dirt) |
178 | jffs2_write_super(sb); | |
179 | ||
ced22070 | 180 | mutex_lock(&c->alloc_sem); |
1da177e4 | 181 | jffs2_flush_wbuf_pad(c); |
ced22070 | 182 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
183 | |
184 | jffs2_sum_exit(c); | |
185 | ||
1da177e4 LT |
186 | jffs2_free_ino_caches(c); |
187 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 188 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
189 | vfree(c->blocks); |
190 | else | |
191 | kfree(c->blocks); | |
192 | jffs2_flash_cleanup(c); | |
193 | kfree(c->inocache_list); | |
aa98d7cf | 194 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
195 | if (c->mtd->sync) |
196 | c->mtd->sync(c->mtd); | |
197 | ||
198 | D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); | |
199 | } | |
200 | ||
201 | static void jffs2_kill_sb(struct super_block *sb) | |
202 | { | |
203 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
204 | if (!(sb->s_flags & MS_RDONLY)) |
205 | jffs2_stop_garbage_collect_thread(c); | |
acaebfd8 | 206 | kill_mtd_super(sb); |
1da177e4 LT |
207 | kfree(c); |
208 | } | |
209 | ||
210 | static struct file_system_type jffs2_fs_type = { | |
211 | .owner = THIS_MODULE, | |
212 | .name = "jffs2", | |
213 | .get_sb = jffs2_get_sb, | |
214 | .kill_sb = jffs2_kill_sb, | |
215 | }; | |
216 | ||
217 | static int __init init_jffs2_fs(void) | |
218 | { | |
219 | int ret; | |
220 | ||
3e68fbb5 DW |
221 | /* Paranoia checks for on-medium structures. If we ask GCC |
222 | to pack them with __attribute__((packed)) then it _also_ | |
223 | assumes that they're not aligned -- so it emits crappy | |
224 | code on some architectures. Ideally we want an attribute | |
225 | which means just 'no padding', without the alignment | |
226 | thing. But GCC doesn't have that -- we have to just | |
227 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
228 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
229 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
230 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
231 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 232 | |
1da177e4 | 233 | printk(KERN_INFO "JFFS2 version 2.2." |
2f82ce1e | 234 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 235 | " (NAND)" |
e631ddba FH |
236 | #endif |
237 | #ifdef CONFIG_JFFS2_SUMMARY | |
238 | " (SUMMARY) " | |
1da177e4 | 239 | #endif |
c00c310e | 240 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
241 | |
242 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
243 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
244 | 0, (SLAB_RECLAIM_ACCOUNT| |
245 | SLAB_MEM_SPREAD), | |
20c2df83 | 246 | jffs2_i_init_once); |
1da177e4 LT |
247 | if (!jffs2_inode_cachep) { |
248 | printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n"); | |
249 | return -ENOMEM; | |
250 | } | |
251 | ret = jffs2_compressors_init(); | |
252 | if (ret) { | |
253 | printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n"); | |
254 | goto out; | |
255 | } | |
256 | ret = jffs2_create_slab_caches(); | |
257 | if (ret) { | |
258 | printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n"); | |
259 | goto out_compressors; | |
260 | } | |
261 | ret = register_filesystem(&jffs2_fs_type); | |
262 | if (ret) { | |
263 | printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n"); | |
264 | goto out_slab; | |
265 | } | |
266 | return 0; | |
267 | ||
268 | out_slab: | |
269 | jffs2_destroy_slab_caches(); | |
270 | out_compressors: | |
271 | jffs2_compressors_exit(); | |
272 | out: | |
273 | kmem_cache_destroy(jffs2_inode_cachep); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | static void __exit exit_jffs2_fs(void) | |
278 | { | |
279 | unregister_filesystem(&jffs2_fs_type); | |
280 | jffs2_destroy_slab_caches(); | |
281 | jffs2_compressors_exit(); | |
282 | kmem_cache_destroy(jffs2_inode_cachep); | |
283 | } | |
284 | ||
285 | module_init(init_jffs2_fs); | |
286 | module_exit(exit_jffs2_fs); | |
287 | ||
288 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
289 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 290 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 291 | // the sake of this tag. It's Free Software. |