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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 | 19 | #include <linux/mount.h> |
92abc475 | 20 | #include <linux/parser.h> |
1da177e4 LT |
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> | |
92abc475 | 26 | #include <linux/seq_file.h> |
5f556aab | 27 | #include <linux/exportfs.h> |
1da177e4 LT |
28 | #include "compr.h" |
29 | #include "nodelist.h" | |
30 | ||
31 | static void jffs2_put_super(struct super_block *); | |
32 | ||
e18b890b | 33 | static struct kmem_cache *jffs2_inode_cachep; |
1da177e4 LT |
34 | |
35 | static struct inode *jffs2_alloc_inode(struct super_block *sb) | |
36 | { | |
4e571aba DW |
37 | struct jffs2_inode_info *f; |
38 | ||
39 | f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); | |
40 | if (!f) | |
1da177e4 | 41 | return NULL; |
4e571aba | 42 | return &f->vfs_inode; |
1da177e4 LT |
43 | } |
44 | ||
fa0d7e3d | 45 | static void jffs2_i_callback(struct rcu_head *head) |
1da177e4 | 46 | { |
fa0d7e3d | 47 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
48 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); |
49 | } | |
50 | ||
fa0d7e3d NP |
51 | static void jffs2_destroy_inode(struct inode *inode) |
52 | { | |
53 | call_rcu(&inode->i_rcu, jffs2_i_callback); | |
54 | } | |
55 | ||
51cc5068 | 56 | static void jffs2_i_init_once(void *foo) |
1da177e4 | 57 | { |
4e571aba | 58 | struct jffs2_inode_info *f = foo; |
1da177e4 | 59 | |
4e571aba DW |
60 | mutex_init(&f->sem); |
61 | inode_init_once(&f->vfs_inode); | |
1da177e4 LT |
62 | } |
63 | ||
01ba6875 CH |
64 | static void jffs2_write_super(struct super_block *sb) |
65 | { | |
66 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
ebc1ac16 CH |
67 | |
68 | lock_super(sb); | |
01ba6875 CH |
69 | sb->s_dirt = 0; |
70 | ||
ebc1ac16 CH |
71 | if (!(sb->s_flags & MS_RDONLY)) { |
72 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
ebc1ac16 CH |
73 | jffs2_flush_wbuf_gc(c, 0); |
74 | } | |
01ba6875 | 75 | |
ebc1ac16 | 76 | unlock_super(sb); |
01ba6875 CH |
77 | } |
78 | ||
92abc475 AS |
79 | static const char *jffs2_compr_name(unsigned int compr) |
80 | { | |
81 | switch (compr) { | |
82 | case JFFS2_COMPR_MODE_NONE: | |
83 | return "none"; | |
123005f3 AS |
84 | #ifdef CONFIG_JFFS2_LZO |
85 | case JFFS2_COMPR_MODE_FORCELZO: | |
86 | return "lzo"; | |
87 | #endif | |
88 | #ifdef CONFIG_JFFS2_ZLIB | |
89 | case JFFS2_COMPR_MODE_FORCEZLIB: | |
90 | return "zlib"; | |
91 | #endif | |
92abc475 AS |
92 | default: |
93 | /* should never happen; programmer error */ | |
94 | WARN_ON(1); | |
95 | return ""; | |
96 | } | |
97 | } | |
98 | ||
34c80b1d | 99 | static int jffs2_show_options(struct seq_file *s, struct dentry *root) |
92abc475 | 100 | { |
34c80b1d | 101 | struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb); |
92abc475 AS |
102 | struct jffs2_mount_opts *opts = &c->mount_opts; |
103 | ||
104 | if (opts->override_compr) | |
105 | seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr)); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
1da177e4 LT |
110 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
111 | { | |
112 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
113 | ||
d579ed00 CH |
114 | jffs2_write_super(sb); |
115 | ||
ced22070 | 116 | mutex_lock(&c->alloc_sem); |
1da177e4 | 117 | jffs2_flush_wbuf_pad(c); |
ced22070 | 118 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
119 | return 0; |
120 | } | |
121 | ||
5f556aab DW |
122 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
123 | uint32_t generation) | |
124 | { | |
125 | /* We don't care about i_generation. We'll destroy the flash | |
126 | before we start re-using inode numbers anyway. And even | |
127 | if that wasn't true, we'd have other problems...*/ | |
128 | return jffs2_iget(sb, ino); | |
129 | } | |
130 | ||
131 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
132 | int fh_len, int fh_type) | |
133 | { | |
134 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
135 | jffs2_nfs_get_inode); | |
136 | } | |
137 | ||
138 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
139 | int fh_len, int fh_type) | |
140 | { | |
141 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
142 | jffs2_nfs_get_inode); | |
143 | } | |
144 | ||
145 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
146 | { | |
147 | struct jffs2_inode_info *f; | |
148 | uint32_t pino; | |
149 | ||
150 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); | |
151 | ||
152 | f = JFFS2_INODE_INFO(child->d_inode); | |
153 | ||
154 | pino = f->inocache->pino_nlink; | |
155 | ||
156 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
157 | f->inocache->ino, pino); | |
158 | ||
159 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); | |
160 | } | |
161 | ||
ac4cfdd6 | 162 | static const struct export_operations jffs2_export_ops = { |
5f556aab DW |
163 | .get_parent = jffs2_get_parent, |
164 | .fh_to_dentry = jffs2_fh_to_dentry, | |
165 | .fh_to_parent = jffs2_fh_to_parent, | |
166 | }; | |
167 | ||
92abc475 AS |
168 | /* |
169 | * JFFS2 mount options. | |
170 | * | |
171 | * Opt_override_compr: override default compressor | |
172 | * Opt_err: just end of array marker | |
173 | */ | |
174 | enum { | |
175 | Opt_override_compr, | |
176 | Opt_err, | |
177 | }; | |
178 | ||
179 | static const match_table_t tokens = { | |
180 | {Opt_override_compr, "compr=%s"}, | |
181 | {Opt_err, NULL}, | |
182 | }; | |
183 | ||
184 | static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) | |
185 | { | |
186 | substring_t args[MAX_OPT_ARGS]; | |
187 | char *p, *name; | |
188 | ||
189 | if (!data) | |
190 | return 0; | |
191 | ||
192 | while ((p = strsep(&data, ","))) { | |
193 | int token; | |
194 | ||
195 | if (!*p) | |
196 | continue; | |
197 | ||
198 | token = match_token(p, tokens, args); | |
199 | switch (token) { | |
200 | case Opt_override_compr: | |
201 | name = match_strdup(&args[0]); | |
202 | ||
203 | if (!name) | |
204 | return -ENOMEM; | |
123005f3 | 205 | if (!strcmp(name, "none")) |
92abc475 | 206 | c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; |
123005f3 AS |
207 | #ifdef CONFIG_JFFS2_LZO |
208 | else if (!strcmp(name, "lzo")) | |
209 | c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; | |
210 | #endif | |
211 | #ifdef CONFIG_JFFS2_ZLIB | |
212 | else if (!strcmp(name, "zlib")) | |
213 | c->mount_opts.compr = | |
214 | JFFS2_COMPR_MODE_FORCEZLIB; | |
215 | #endif | |
216 | else { | |
217 | printk(KERN_ERR "JFFS2 Error: unknown compressor \"%s\"", | |
218 | name); | |
219 | kfree(name); | |
220 | return -EINVAL; | |
92abc475 AS |
221 | } |
222 | kfree(name); | |
123005f3 | 223 | c->mount_opts.override_compr = true; |
92abc475 AS |
224 | break; |
225 | default: | |
226 | printk(KERN_ERR "JFFS2 Error: unrecognized mount option '%s' or missing value\n", | |
227 | p); | |
228 | return -EINVAL; | |
229 | } | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) | |
236 | { | |
237 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
238 | int err; | |
239 | ||
240 | err = jffs2_parse_options(c, data); | |
241 | if (err) | |
242 | return -EINVAL; | |
243 | ||
244 | return jffs2_do_remount_fs(sb, flags, data); | |
245 | } | |
246 | ||
ee9b6d61 | 247 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
248 | { |
249 | .alloc_inode = jffs2_alloc_inode, | |
250 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 LT |
251 | .put_super = jffs2_put_super, |
252 | .write_super = jffs2_write_super, | |
253 | .statfs = jffs2_statfs, | |
254 | .remount_fs = jffs2_remount_fs, | |
b57922d9 | 255 | .evict_inode = jffs2_evict_inode, |
1da177e4 | 256 | .dirty_inode = jffs2_dirty_inode, |
92abc475 | 257 | .show_options = jffs2_show_options, |
1da177e4 LT |
258 | .sync_fs = jffs2_sync_fs, |
259 | }; | |
260 | ||
acaebfd8 DH |
261 | /* |
262 | * fill in the superblock | |
263 | */ | |
264 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 265 | { |
1da177e4 | 266 | struct jffs2_sb_info *c; |
db719222 JB |
267 | int ret; |
268 | ||
acaebfd8 DH |
269 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():" |
270 | " New superblock for device %d (\"%s\")\n", | |
271 | sb->s_mtd->index, sb->s_mtd->name)); | |
1da177e4 | 272 | |
f8314dc6 | 273 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1a028dd2 | 274 | if (!c) |
454e2398 | 275 | return -ENOMEM; |
1da177e4 | 276 | |
acaebfd8 DH |
277 | c->mtd = sb->s_mtd; |
278 | c->os_priv = sb; | |
279 | sb->s_fs_info = c; | |
1da177e4 | 280 | |
92abc475 AS |
281 | ret = jffs2_parse_options(c, data); |
282 | if (ret) { | |
283 | kfree(c); | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
acaebfd8 DH |
287 | /* Initialize JFFS2 superblock locks, the further initialization will |
288 | * be done later */ | |
ced22070 DW |
289 | mutex_init(&c->alloc_sem); |
290 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
291 | init_waitqueue_head(&c->erase_wait); |
292 | init_waitqueue_head(&c->inocache_wq); | |
293 | spin_lock_init(&c->erase_completion_lock); | |
294 | spin_lock_init(&c->inocache_lock); | |
295 | ||
1da177e4 | 296 | sb->s_op = &jffs2_super_operations; |
5f556aab | 297 | sb->s_export_op = &jffs2_export_ops; |
acaebfd8 | 298 | sb->s_flags = sb->s_flags | MS_NOATIME; |
aa98d7cf KK |
299 | sb->s_xattr = jffs2_xattr_handlers; |
300 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
301 | sb->s_flags |= MS_POSIXACL; | |
302 | #endif | |
db719222 | 303 | ret = jffs2_do_fill_super(sb, data, silent); |
db719222 | 304 | return ret; |
1da177e4 LT |
305 | } |
306 | ||
848b83a5 | 307 | static struct dentry *jffs2_mount(struct file_system_type *fs_type, |
454e2398 | 308 | int flags, const char *dev_name, |
848b83a5 | 309 | void *data) |
1da177e4 | 310 | { |
848b83a5 | 311 | return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); |
1da177e4 LT |
312 | } |
313 | ||
314 | static void jffs2_put_super (struct super_block *sb) | |
315 | { | |
316 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
317 | ||
318 | D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); | |
319 | ||
8c85e125 CH |
320 | if (sb->s_dirt) |
321 | jffs2_write_super(sb); | |
322 | ||
ced22070 | 323 | mutex_lock(&c->alloc_sem); |
1da177e4 | 324 | jffs2_flush_wbuf_pad(c); |
ced22070 | 325 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
326 | |
327 | jffs2_sum_exit(c); | |
328 | ||
1da177e4 LT |
329 | jffs2_free_ino_caches(c); |
330 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 331 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
332 | vfree(c->blocks); |
333 | else | |
334 | kfree(c->blocks); | |
335 | jffs2_flash_cleanup(c); | |
336 | kfree(c->inocache_list); | |
aa98d7cf | 337 | jffs2_clear_xattr_subsystem(c); |
327cf292 | 338 | mtd_sync(c->mtd); |
1da177e4 LT |
339 | D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); |
340 | } | |
341 | ||
342 | static void jffs2_kill_sb(struct super_block *sb) | |
343 | { | |
344 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
345 | if (!(sb->s_flags & MS_RDONLY)) |
346 | jffs2_stop_garbage_collect_thread(c); | |
acaebfd8 | 347 | kill_mtd_super(sb); |
1da177e4 LT |
348 | kfree(c); |
349 | } | |
350 | ||
351 | static struct file_system_type jffs2_fs_type = { | |
352 | .owner = THIS_MODULE, | |
353 | .name = "jffs2", | |
848b83a5 | 354 | .mount = jffs2_mount, |
1da177e4 LT |
355 | .kill_sb = jffs2_kill_sb, |
356 | }; | |
357 | ||
358 | static int __init init_jffs2_fs(void) | |
359 | { | |
360 | int ret; | |
361 | ||
3e68fbb5 DW |
362 | /* Paranoia checks for on-medium structures. If we ask GCC |
363 | to pack them with __attribute__((packed)) then it _also_ | |
364 | assumes that they're not aligned -- so it emits crappy | |
365 | code on some architectures. Ideally we want an attribute | |
366 | which means just 'no padding', without the alignment | |
367 | thing. But GCC doesn't have that -- we have to just | |
368 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
369 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
370 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
371 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
372 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 373 | |
1da177e4 | 374 | printk(KERN_INFO "JFFS2 version 2.2." |
2f82ce1e | 375 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 376 | " (NAND)" |
e631ddba FH |
377 | #endif |
378 | #ifdef CONFIG_JFFS2_SUMMARY | |
379 | " (SUMMARY) " | |
1da177e4 | 380 | #endif |
c00c310e | 381 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
382 | |
383 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
384 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
385 | 0, (SLAB_RECLAIM_ACCOUNT| |
386 | SLAB_MEM_SPREAD), | |
20c2df83 | 387 | jffs2_i_init_once); |
1da177e4 LT |
388 | if (!jffs2_inode_cachep) { |
389 | printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n"); | |
390 | return -ENOMEM; | |
391 | } | |
392 | ret = jffs2_compressors_init(); | |
393 | if (ret) { | |
394 | printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n"); | |
395 | goto out; | |
396 | } | |
397 | ret = jffs2_create_slab_caches(); | |
398 | if (ret) { | |
399 | printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n"); | |
400 | goto out_compressors; | |
401 | } | |
402 | ret = register_filesystem(&jffs2_fs_type); | |
403 | if (ret) { | |
404 | printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n"); | |
405 | goto out_slab; | |
406 | } | |
407 | return 0; | |
408 | ||
409 | out_slab: | |
410 | jffs2_destroy_slab_caches(); | |
411 | out_compressors: | |
412 | jffs2_compressors_exit(); | |
413 | out: | |
414 | kmem_cache_destroy(jffs2_inode_cachep); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | static void __exit exit_jffs2_fs(void) | |
419 | { | |
420 | unregister_filesystem(&jffs2_fs_type); | |
421 | jffs2_destroy_slab_caches(); | |
422 | jffs2_compressors_exit(); | |
423 | kmem_cache_destroy(jffs2_inode_cachep); | |
424 | } | |
425 | ||
426 | module_init(init_jffs2_fs); | |
427 | module_exit(exit_jffs2_fs); | |
428 | ||
429 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
430 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 431 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 432 | // the sake of this tag. It's Free Software. |