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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> | |
405f5571 | 15 | #include <linux/smp_lock.h> |
1da177e4 LT |
16 | #include <linux/init.h> |
17 | #include <linux/list.h> | |
18 | #include <linux/fs.h> | |
9c74034f | 19 | #include <linux/err.h> |
1da177e4 LT |
20 | #include <linux/mount.h> |
21 | #include <linux/jffs2.h> | |
22 | #include <linux/pagemap.h> | |
acaebfd8 | 23 | #include <linux/mtd/super.h> |
1da177e4 LT |
24 | #include <linux/ctype.h> |
25 | #include <linux/namei.h> | |
5f556aab | 26 | #include <linux/exportfs.h> |
1da177e4 LT |
27 | #include "compr.h" |
28 | #include "nodelist.h" | |
29 | ||
30 | static void jffs2_put_super(struct super_block *); | |
31 | ||
e18b890b | 32 | static struct kmem_cache *jffs2_inode_cachep; |
1da177e4 LT |
33 | |
34 | static struct inode *jffs2_alloc_inode(struct super_block *sb) | |
35 | { | |
4e571aba DW |
36 | struct jffs2_inode_info *f; |
37 | ||
38 | f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); | |
39 | if (!f) | |
1da177e4 | 40 | return NULL; |
4e571aba | 41 | return &f->vfs_inode; |
1da177e4 LT |
42 | } |
43 | ||
44 | static void jffs2_destroy_inode(struct inode *inode) | |
45 | { | |
46 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); | |
47 | } | |
48 | ||
51cc5068 | 49 | static void jffs2_i_init_once(void *foo) |
1da177e4 | 50 | { |
4e571aba | 51 | struct jffs2_inode_info *f = foo; |
1da177e4 | 52 | |
4e571aba DW |
53 | mutex_init(&f->sem); |
54 | inode_init_once(&f->vfs_inode); | |
1da177e4 LT |
55 | } |
56 | ||
01ba6875 CH |
57 | static void jffs2_write_super(struct super_block *sb) |
58 | { | |
59 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
ebc1ac16 CH |
60 | |
61 | lock_super(sb); | |
01ba6875 CH |
62 | sb->s_dirt = 0; |
63 | ||
ebc1ac16 CH |
64 | if (!(sb->s_flags & MS_RDONLY)) { |
65 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
ebc1ac16 CH |
66 | jffs2_flush_wbuf_gc(c, 0); |
67 | } | |
01ba6875 | 68 | |
ebc1ac16 | 69 | unlock_super(sb); |
01ba6875 CH |
70 | } |
71 | ||
1da177e4 LT |
72 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
73 | { | |
74 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
75 | ||
d579ed00 CH |
76 | jffs2_write_super(sb); |
77 | ||
ced22070 | 78 | mutex_lock(&c->alloc_sem); |
1da177e4 | 79 | jffs2_flush_wbuf_pad(c); |
ced22070 | 80 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
81 | return 0; |
82 | } | |
83 | ||
5f556aab DW |
84 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
85 | uint32_t generation) | |
86 | { | |
87 | /* We don't care about i_generation. We'll destroy the flash | |
88 | before we start re-using inode numbers anyway. And even | |
89 | if that wasn't true, we'd have other problems...*/ | |
90 | return jffs2_iget(sb, ino); | |
91 | } | |
92 | ||
93 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
94 | int fh_len, int fh_type) | |
95 | { | |
96 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
97 | jffs2_nfs_get_inode); | |
98 | } | |
99 | ||
100 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
101 | int fh_len, int fh_type) | |
102 | { | |
103 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
104 | jffs2_nfs_get_inode); | |
105 | } | |
106 | ||
107 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
108 | { | |
109 | struct jffs2_inode_info *f; | |
110 | uint32_t pino; | |
111 | ||
112 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); | |
113 | ||
114 | f = JFFS2_INODE_INFO(child->d_inode); | |
115 | ||
116 | pino = f->inocache->pino_nlink; | |
117 | ||
118 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
119 | f->inocache->ino, pino); | |
120 | ||
121 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); | |
122 | } | |
123 | ||
ac4cfdd6 | 124 | static const struct export_operations jffs2_export_ops = { |
5f556aab DW |
125 | .get_parent = jffs2_get_parent, |
126 | .fh_to_dentry = jffs2_fh_to_dentry, | |
127 | .fh_to_parent = jffs2_fh_to_parent, | |
128 | }; | |
129 | ||
ee9b6d61 | 130 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
131 | { |
132 | .alloc_inode = jffs2_alloc_inode, | |
133 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 LT |
134 | .put_super = jffs2_put_super, |
135 | .write_super = jffs2_write_super, | |
136 | .statfs = jffs2_statfs, | |
137 | .remount_fs = jffs2_remount_fs, | |
138 | .clear_inode = jffs2_clear_inode, | |
139 | .dirty_inode = jffs2_dirty_inode, | |
140 | .sync_fs = jffs2_sync_fs, | |
141 | }; | |
142 | ||
acaebfd8 DH |
143 | /* |
144 | * fill in the superblock | |
145 | */ | |
146 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 147 | { |
1da177e4 | 148 | struct jffs2_sb_info *c; |
acaebfd8 DH |
149 | |
150 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():" | |
151 | " New superblock for device %d (\"%s\")\n", | |
152 | sb->s_mtd->index, sb->s_mtd->name)); | |
1da177e4 | 153 | |
f8314dc6 | 154 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1da177e4 | 155 | if (!c) |
454e2398 | 156 | return -ENOMEM; |
1da177e4 | 157 | |
acaebfd8 DH |
158 | c->mtd = sb->s_mtd; |
159 | c->os_priv = sb; | |
160 | sb->s_fs_info = c; | |
1da177e4 | 161 | |
acaebfd8 DH |
162 | /* Initialize JFFS2 superblock locks, the further initialization will |
163 | * be done later */ | |
ced22070 DW |
164 | mutex_init(&c->alloc_sem); |
165 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
166 | init_waitqueue_head(&c->erase_wait); |
167 | init_waitqueue_head(&c->inocache_wq); | |
168 | spin_lock_init(&c->erase_completion_lock); | |
169 | spin_lock_init(&c->inocache_lock); | |
170 | ||
1da177e4 | 171 | sb->s_op = &jffs2_super_operations; |
5f556aab | 172 | sb->s_export_op = &jffs2_export_ops; |
acaebfd8 | 173 | sb->s_flags = sb->s_flags | MS_NOATIME; |
aa98d7cf KK |
174 | sb->s_xattr = jffs2_xattr_handlers; |
175 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
176 | sb->s_flags |= MS_POSIXACL; | |
177 | #endif | |
acaebfd8 | 178 | return jffs2_do_fill_super(sb, data, silent); |
1da177e4 LT |
179 | } |
180 | ||
454e2398 DH |
181 | static int jffs2_get_sb(struct file_system_type *fs_type, |
182 | int flags, const char *dev_name, | |
183 | void *data, struct vfsmount *mnt) | |
1da177e4 | 184 | { |
acaebfd8 DH |
185 | return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super, |
186 | mnt); | |
1da177e4 LT |
187 | } |
188 | ||
189 | static void jffs2_put_super (struct super_block *sb) | |
190 | { | |
191 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
192 | ||
193 | D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); | |
194 | ||
6cfd0148 CH |
195 | lock_kernel(); |
196 | ||
8c85e125 CH |
197 | if (sb->s_dirt) |
198 | jffs2_write_super(sb); | |
199 | ||
ced22070 | 200 | mutex_lock(&c->alloc_sem); |
1da177e4 | 201 | jffs2_flush_wbuf_pad(c); |
ced22070 | 202 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
203 | |
204 | jffs2_sum_exit(c); | |
205 | ||
1da177e4 LT |
206 | jffs2_free_ino_caches(c); |
207 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 208 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
209 | vfree(c->blocks); |
210 | else | |
211 | kfree(c->blocks); | |
212 | jffs2_flash_cleanup(c); | |
213 | kfree(c->inocache_list); | |
aa98d7cf | 214 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
215 | if (c->mtd->sync) |
216 | c->mtd->sync(c->mtd); | |
217 | ||
6cfd0148 CH |
218 | unlock_kernel(); |
219 | ||
1da177e4 LT |
220 | D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); |
221 | } | |
222 | ||
223 | static void jffs2_kill_sb(struct super_block *sb) | |
224 | { | |
225 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
226 | if (!(sb->s_flags & MS_RDONLY)) |
227 | jffs2_stop_garbage_collect_thread(c); | |
acaebfd8 | 228 | kill_mtd_super(sb); |
1da177e4 LT |
229 | kfree(c); |
230 | } | |
231 | ||
232 | static struct file_system_type jffs2_fs_type = { | |
233 | .owner = THIS_MODULE, | |
234 | .name = "jffs2", | |
235 | .get_sb = jffs2_get_sb, | |
236 | .kill_sb = jffs2_kill_sb, | |
237 | }; | |
238 | ||
239 | static int __init init_jffs2_fs(void) | |
240 | { | |
241 | int ret; | |
242 | ||
3e68fbb5 DW |
243 | /* Paranoia checks for on-medium structures. If we ask GCC |
244 | to pack them with __attribute__((packed)) then it _also_ | |
245 | assumes that they're not aligned -- so it emits crappy | |
246 | code on some architectures. Ideally we want an attribute | |
247 | which means just 'no padding', without the alignment | |
248 | thing. But GCC doesn't have that -- we have to just | |
249 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
250 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
251 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
252 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
253 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 254 | |
1da177e4 | 255 | printk(KERN_INFO "JFFS2 version 2.2." |
2f82ce1e | 256 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 257 | " (NAND)" |
e631ddba FH |
258 | #endif |
259 | #ifdef CONFIG_JFFS2_SUMMARY | |
260 | " (SUMMARY) " | |
1da177e4 | 261 | #endif |
c00c310e | 262 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
263 | |
264 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
265 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
266 | 0, (SLAB_RECLAIM_ACCOUNT| |
267 | SLAB_MEM_SPREAD), | |
20c2df83 | 268 | jffs2_i_init_once); |
1da177e4 LT |
269 | if (!jffs2_inode_cachep) { |
270 | printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n"); | |
271 | return -ENOMEM; | |
272 | } | |
273 | ret = jffs2_compressors_init(); | |
274 | if (ret) { | |
275 | printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n"); | |
276 | goto out; | |
277 | } | |
278 | ret = jffs2_create_slab_caches(); | |
279 | if (ret) { | |
280 | printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n"); | |
281 | goto out_compressors; | |
282 | } | |
283 | ret = register_filesystem(&jffs2_fs_type); | |
284 | if (ret) { | |
285 | printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n"); | |
286 | goto out_slab; | |
287 | } | |
288 | return 0; | |
289 | ||
290 | out_slab: | |
291 | jffs2_destroy_slab_caches(); | |
292 | out_compressors: | |
293 | jffs2_compressors_exit(); | |
294 | out: | |
295 | kmem_cache_destroy(jffs2_inode_cachep); | |
296 | return ret; | |
297 | } | |
298 | ||
299 | static void __exit exit_jffs2_fs(void) | |
300 | { | |
301 | unregister_filesystem(&jffs2_fs_type); | |
302 | jffs2_destroy_slab_caches(); | |
303 | jffs2_compressors_exit(); | |
304 | kmem_cache_destroy(jffs2_inode_cachep); | |
305 | } | |
306 | ||
307 | module_init(init_jffs2_fs); | |
308 | module_exit(exit_jffs2_fs); | |
309 | ||
310 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
311 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 312 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 313 | // the sake of this tag. It's Free Software. |