Commit | Line | Data |
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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 | ||
01ba6875 CH |
56 | static void jffs2_write_super(struct super_block *sb) |
57 | { | |
58 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
59 | sb->s_dirt = 0; | |
60 | ||
61 | if (sb->s_flags & MS_RDONLY) | |
62 | return; | |
63 | ||
64 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
65 | jffs2_garbage_collect_trigger(c); | |
66 | jffs2_erase_pending_blocks(c, 0); | |
67 | jffs2_flush_wbuf_gc(c, 0); | |
68 | } | |
69 | ||
1da177e4 LT |
70 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
71 | { | |
72 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
73 | ||
ced22070 | 74 | mutex_lock(&c->alloc_sem); |
1da177e4 | 75 | jffs2_flush_wbuf_pad(c); |
ced22070 | 76 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
77 | return 0; |
78 | } | |
79 | ||
5f556aab DW |
80 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
81 | uint32_t generation) | |
82 | { | |
83 | /* We don't care about i_generation. We'll destroy the flash | |
84 | before we start re-using inode numbers anyway. And even | |
85 | if that wasn't true, we'd have other problems...*/ | |
86 | return jffs2_iget(sb, ino); | |
87 | } | |
88 | ||
89 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
90 | int fh_len, int fh_type) | |
91 | { | |
92 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
93 | jffs2_nfs_get_inode); | |
94 | } | |
95 | ||
96 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
97 | int fh_len, int fh_type) | |
98 | { | |
99 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
100 | jffs2_nfs_get_inode); | |
101 | } | |
102 | ||
103 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
104 | { | |
105 | struct jffs2_inode_info *f; | |
106 | uint32_t pino; | |
107 | ||
108 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); | |
109 | ||
110 | f = JFFS2_INODE_INFO(child->d_inode); | |
111 | ||
112 | pino = f->inocache->pino_nlink; | |
113 | ||
114 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
115 | f->inocache->ino, pino); | |
116 | ||
117 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); | |
118 | } | |
119 | ||
120 | static struct export_operations jffs2_export_ops = { | |
121 | .get_parent = jffs2_get_parent, | |
122 | .fh_to_dentry = jffs2_fh_to_dentry, | |
123 | .fh_to_parent = jffs2_fh_to_parent, | |
124 | }; | |
125 | ||
ee9b6d61 | 126 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
127 | { |
128 | .alloc_inode = jffs2_alloc_inode, | |
129 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 LT |
130 | .put_super = jffs2_put_super, |
131 | .write_super = jffs2_write_super, | |
132 | .statfs = jffs2_statfs, | |
133 | .remount_fs = jffs2_remount_fs, | |
134 | .clear_inode = jffs2_clear_inode, | |
135 | .dirty_inode = jffs2_dirty_inode, | |
136 | .sync_fs = jffs2_sync_fs, | |
137 | }; | |
138 | ||
acaebfd8 DH |
139 | /* |
140 | * fill in the superblock | |
141 | */ | |
142 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 143 | { |
1da177e4 | 144 | struct jffs2_sb_info *c; |
acaebfd8 DH |
145 | |
146 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():" | |
147 | " New superblock for device %d (\"%s\")\n", | |
148 | sb->s_mtd->index, sb->s_mtd->name)); | |
1da177e4 | 149 | |
f8314dc6 | 150 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1da177e4 | 151 | if (!c) |
454e2398 | 152 | return -ENOMEM; |
1da177e4 | 153 | |
acaebfd8 DH |
154 | c->mtd = sb->s_mtd; |
155 | c->os_priv = sb; | |
156 | sb->s_fs_info = c; | |
1da177e4 | 157 | |
acaebfd8 DH |
158 | /* Initialize JFFS2 superblock locks, the further initialization will |
159 | * be done later */ | |
ced22070 DW |
160 | mutex_init(&c->alloc_sem); |
161 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
162 | init_waitqueue_head(&c->erase_wait); |
163 | init_waitqueue_head(&c->inocache_wq); | |
164 | spin_lock_init(&c->erase_completion_lock); | |
165 | spin_lock_init(&c->inocache_lock); | |
166 | ||
1da177e4 | 167 | sb->s_op = &jffs2_super_operations; |
5f556aab | 168 | sb->s_export_op = &jffs2_export_ops; |
acaebfd8 | 169 | sb->s_flags = sb->s_flags | MS_NOATIME; |
aa98d7cf KK |
170 | sb->s_xattr = jffs2_xattr_handlers; |
171 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
172 | sb->s_flags |= MS_POSIXACL; | |
173 | #endif | |
acaebfd8 | 174 | return jffs2_do_fill_super(sb, data, silent); |
1da177e4 LT |
175 | } |
176 | ||
454e2398 DH |
177 | static int jffs2_get_sb(struct file_system_type *fs_type, |
178 | int flags, const char *dev_name, | |
179 | void *data, struct vfsmount *mnt) | |
1da177e4 | 180 | { |
acaebfd8 DH |
181 | return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super, |
182 | mnt); | |
1da177e4 LT |
183 | } |
184 | ||
185 | static void jffs2_put_super (struct super_block *sb) | |
186 | { | |
187 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
188 | ||
189 | D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); | |
190 | ||
6cfd0148 CH |
191 | lock_kernel(); |
192 | ||
8c85e125 CH |
193 | if (sb->s_dirt) |
194 | jffs2_write_super(sb); | |
195 | ||
ced22070 | 196 | mutex_lock(&c->alloc_sem); |
1da177e4 | 197 | jffs2_flush_wbuf_pad(c); |
ced22070 | 198 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
199 | |
200 | jffs2_sum_exit(c); | |
201 | ||
1da177e4 LT |
202 | jffs2_free_ino_caches(c); |
203 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 204 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
205 | vfree(c->blocks); |
206 | else | |
207 | kfree(c->blocks); | |
208 | jffs2_flash_cleanup(c); | |
209 | kfree(c->inocache_list); | |
aa98d7cf | 210 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
211 | if (c->mtd->sync) |
212 | c->mtd->sync(c->mtd); | |
213 | ||
6cfd0148 CH |
214 | unlock_kernel(); |
215 | ||
1da177e4 LT |
216 | D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); |
217 | } | |
218 | ||
219 | static void jffs2_kill_sb(struct super_block *sb) | |
220 | { | |
221 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
222 | if (!(sb->s_flags & MS_RDONLY)) |
223 | jffs2_stop_garbage_collect_thread(c); | |
acaebfd8 | 224 | kill_mtd_super(sb); |
1da177e4 LT |
225 | kfree(c); |
226 | } | |
227 | ||
228 | static struct file_system_type jffs2_fs_type = { | |
229 | .owner = THIS_MODULE, | |
230 | .name = "jffs2", | |
231 | .get_sb = jffs2_get_sb, | |
232 | .kill_sb = jffs2_kill_sb, | |
233 | }; | |
234 | ||
235 | static int __init init_jffs2_fs(void) | |
236 | { | |
237 | int ret; | |
238 | ||
3e68fbb5 DW |
239 | /* Paranoia checks for on-medium structures. If we ask GCC |
240 | to pack them with __attribute__((packed)) then it _also_ | |
241 | assumes that they're not aligned -- so it emits crappy | |
242 | code on some architectures. Ideally we want an attribute | |
243 | which means just 'no padding', without the alignment | |
244 | thing. But GCC doesn't have that -- we have to just | |
245 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
246 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
247 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
248 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
249 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 250 | |
1da177e4 | 251 | printk(KERN_INFO "JFFS2 version 2.2." |
2f82ce1e | 252 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 253 | " (NAND)" |
e631ddba FH |
254 | #endif |
255 | #ifdef CONFIG_JFFS2_SUMMARY | |
256 | " (SUMMARY) " | |
1da177e4 | 257 | #endif |
c00c310e | 258 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
259 | |
260 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
261 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
262 | 0, (SLAB_RECLAIM_ACCOUNT| |
263 | SLAB_MEM_SPREAD), | |
20c2df83 | 264 | jffs2_i_init_once); |
1da177e4 LT |
265 | if (!jffs2_inode_cachep) { |
266 | printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n"); | |
267 | return -ENOMEM; | |
268 | } | |
269 | ret = jffs2_compressors_init(); | |
270 | if (ret) { | |
271 | printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n"); | |
272 | goto out; | |
273 | } | |
274 | ret = jffs2_create_slab_caches(); | |
275 | if (ret) { | |
276 | printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n"); | |
277 | goto out_compressors; | |
278 | } | |
279 | ret = register_filesystem(&jffs2_fs_type); | |
280 | if (ret) { | |
281 | printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n"); | |
282 | goto out_slab; | |
283 | } | |
284 | return 0; | |
285 | ||
286 | out_slab: | |
287 | jffs2_destroy_slab_caches(); | |
288 | out_compressors: | |
289 | jffs2_compressors_exit(); | |
290 | out: | |
291 | kmem_cache_destroy(jffs2_inode_cachep); | |
292 | return ret; | |
293 | } | |
294 | ||
295 | static void __exit exit_jffs2_fs(void) | |
296 | { | |
297 | unregister_filesystem(&jffs2_fs_type); | |
298 | jffs2_destroy_slab_caches(); | |
299 | jffs2_compressors_exit(); | |
300 | kmem_cache_destroy(jffs2_inode_cachep); | |
301 | } | |
302 | ||
303 | module_init(init_jffs2_fs); | |
304 | module_exit(exit_jffs2_fs); | |
305 | ||
306 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
307 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 308 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 309 | // the sake of this tag. It's Free Software. |