Commit | Line | Data |
---|---|---|
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 | ||
5a528957 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/fs.h> | |
9c74034f | 20 | #include <linux/err.h> |
1da177e4 | 21 | #include <linux/mount.h> |
ec10a24f DH |
22 | #include <linux/fs_context.h> |
23 | #include <linux/fs_parser.h> | |
1da177e4 LT |
24 | #include <linux/jffs2.h> |
25 | #include <linux/pagemap.h> | |
acaebfd8 | 26 | #include <linux/mtd/super.h> |
1da177e4 LT |
27 | #include <linux/ctype.h> |
28 | #include <linux/namei.h> | |
92abc475 | 29 | #include <linux/seq_file.h> |
5f556aab | 30 | #include <linux/exportfs.h> |
1da177e4 LT |
31 | #include "compr.h" |
32 | #include "nodelist.h" | |
33 | ||
34 | static void jffs2_put_super(struct super_block *); | |
35 | ||
e18b890b | 36 | static struct kmem_cache *jffs2_inode_cachep; |
1da177e4 LT |
37 | |
38 | static struct inode *jffs2_alloc_inode(struct super_block *sb) | |
39 | { | |
4e571aba DW |
40 | struct jffs2_inode_info *f; |
41 | ||
fd60b288 | 42 | f = alloc_inode_sb(sb, jffs2_inode_cachep, GFP_KERNEL); |
4e571aba | 43 | if (!f) |
1da177e4 | 44 | return NULL; |
4e571aba | 45 | return &f->vfs_inode; |
1da177e4 LT |
46 | } |
47 | ||
db0bd7b7 | 48 | static void jffs2_free_inode(struct inode *inode) |
1da177e4 | 49 | { |
4fdcfab5 AV |
50 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
51 | ||
52 | kfree(f->target); | |
53 | kmem_cache_free(jffs2_inode_cachep, f); | |
1da177e4 LT |
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 | ||
92abc475 AS |
64 | static const char *jffs2_compr_name(unsigned int compr) |
65 | { | |
66 | switch (compr) { | |
67 | case JFFS2_COMPR_MODE_NONE: | |
68 | return "none"; | |
123005f3 AS |
69 | #ifdef CONFIG_JFFS2_LZO |
70 | case JFFS2_COMPR_MODE_FORCELZO: | |
71 | return "lzo"; | |
72 | #endif | |
73 | #ifdef CONFIG_JFFS2_ZLIB | |
74 | case JFFS2_COMPR_MODE_FORCEZLIB: | |
75 | return "zlib"; | |
76 | #endif | |
92abc475 AS |
77 | default: |
78 | /* should never happen; programmer error */ | |
79 | WARN_ON(1); | |
80 | return ""; | |
81 | } | |
82 | } | |
83 | ||
34c80b1d | 84 | static int jffs2_show_options(struct seq_file *s, struct dentry *root) |
92abc475 | 85 | { |
34c80b1d | 86 | struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb); |
92abc475 AS |
87 | struct jffs2_mount_opts *opts = &c->mount_opts; |
88 | ||
89 | if (opts->override_compr) | |
90 | seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr)); | |
cd3ed3c7 | 91 | if (opts->set_rp_size) |
8da8ba2e | 92 | seq_printf(s, ",rp_size=%u", opts->rp_size / 1024); |
92abc475 AS |
93 | |
94 | return 0; | |
95 | } | |
96 | ||
1da177e4 LT |
97 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
98 | { | |
99 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
100 | ||
a445f784 | 101 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
a788c527 DS |
102 | if (jffs2_is_writebuffered(c)) |
103 | cancel_delayed_work_sync(&c->wbuf_dwork); | |
a445f784 AB |
104 | #endif |
105 | ||
ced22070 | 106 | mutex_lock(&c->alloc_sem); |
1da177e4 | 107 | jffs2_flush_wbuf_pad(c); |
ced22070 | 108 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
109 | return 0; |
110 | } | |
111 | ||
5f556aab DW |
112 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
113 | uint32_t generation) | |
114 | { | |
115 | /* We don't care about i_generation. We'll destroy the flash | |
116 | before we start re-using inode numbers anyway. And even | |
117 | if that wasn't true, we'd have other problems...*/ | |
118 | return jffs2_iget(sb, ino); | |
119 | } | |
120 | ||
121 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
122 | int fh_len, int fh_type) | |
123 | { | |
124 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
125 | jffs2_nfs_get_inode); | |
126 | } | |
127 | ||
128 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
129 | int fh_len, int fh_type) | |
130 | { | |
131 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
132 | jffs2_nfs_get_inode); | |
133 | } | |
134 | ||
135 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
136 | { | |
137 | struct jffs2_inode_info *f; | |
138 | uint32_t pino; | |
139 | ||
e36cb0b8 | 140 | BUG_ON(!d_is_dir(child)); |
5f556aab | 141 | |
2b0143b5 | 142 | f = JFFS2_INODE_INFO(d_inode(child)); |
5f556aab DW |
143 | |
144 | pino = f->inocache->pino_nlink; | |
145 | ||
146 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
147 | f->inocache->ino, pino); | |
148 | ||
fc64005c | 149 | return d_obtain_alias(jffs2_iget(child->d_sb, pino)); |
5f556aab DW |
150 | } |
151 | ||
ac4cfdd6 | 152 | static const struct export_operations jffs2_export_ops = { |
5f556aab DW |
153 | .get_parent = jffs2_get_parent, |
154 | .fh_to_dentry = jffs2_fh_to_dentry, | |
155 | .fh_to_parent = jffs2_fh_to_parent, | |
156 | }; | |
157 | ||
92abc475 AS |
158 | /* |
159 | * JFFS2 mount options. | |
160 | * | |
ec10a24f | 161 | * Opt_source: The source device |
92abc475 | 162 | * Opt_override_compr: override default compressor |
8da8ba2e | 163 | * Opt_rp_size: size of reserved pool in KiB |
92abc475 AS |
164 | */ |
165 | enum { | |
166 | Opt_override_compr, | |
8da8ba2e | 167 | Opt_rp_size, |
92abc475 AS |
168 | }; |
169 | ||
5eede625 | 170 | static const struct constant_table jffs2_param_compr[] = { |
2710c957 | 171 | {"none", JFFS2_COMPR_MODE_NONE }, |
123005f3 | 172 | #ifdef CONFIG_JFFS2_LZO |
2710c957 | 173 | {"lzo", JFFS2_COMPR_MODE_FORCELZO }, |
123005f3 AS |
174 | #endif |
175 | #ifdef CONFIG_JFFS2_ZLIB | |
2710c957 | 176 | {"zlib", JFFS2_COMPR_MODE_FORCEZLIB }, |
123005f3 | 177 | #endif |
ec10a24f DH |
178 | {} |
179 | }; | |
180 | ||
d7167b14 | 181 | static const struct fs_parameter_spec jffs2_fs_parameters[] = { |
2710c957 AV |
182 | fsparam_enum ("compr", Opt_override_compr, jffs2_param_compr), |
183 | fsparam_u32 ("rp_size", Opt_rp_size), | |
184 | {} | |
185 | }; | |
186 | ||
ec10a24f DH |
187 | static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param) |
188 | { | |
189 | struct fs_parse_result result; | |
190 | struct jffs2_sb_info *c = fc->s_fs_info; | |
191 | int opt; | |
192 | ||
d7167b14 | 193 | opt = fs_parse(fc, jffs2_fs_parameters, param, &result); |
ec10a24f DH |
194 | if (opt < 0) |
195 | return opt; | |
196 | ||
197 | switch (opt) { | |
198 | case Opt_override_compr: | |
199 | c->mount_opts.compr = result.uint_32; | |
200 | c->mount_opts.override_compr = true; | |
201 | break; | |
202 | case Opt_rp_size: | |
203 | if (result.uint_32 > UINT_MAX / 1024) | |
204 | return invalf(fc, "jffs2: rp_size unrepresentable"); | |
a61df3c4 | 205 | c->mount_opts.rp_size = result.uint_32 * 1024; |
cd3ed3c7 | 206 | c->mount_opts.set_rp_size = true; |
ec10a24f DH |
207 | break; |
208 | default: | |
209 | return -EINVAL; | |
92abc475 AS |
210 | } |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
08cd274f | 215 | static inline void jffs2_update_mount_opts(struct fs_context *fc) |
216 | { | |
217 | struct jffs2_sb_info *new_c = fc->s_fs_info; | |
218 | struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb); | |
219 | ||
220 | mutex_lock(&c->alloc_sem); | |
221 | if (new_c->mount_opts.override_compr) { | |
222 | c->mount_opts.override_compr = new_c->mount_opts.override_compr; | |
223 | c->mount_opts.compr = new_c->mount_opts.compr; | |
224 | } | |
cd3ed3c7 | 225 | if (new_c->mount_opts.set_rp_size) { |
226 | c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size; | |
08cd274f | 227 | c->mount_opts.rp_size = new_c->mount_opts.rp_size; |
cd3ed3c7 | 228 | } |
08cd274f | 229 | mutex_unlock(&c->alloc_sem); |
230 | } | |
231 | ||
ec10a24f | 232 | static int jffs2_reconfigure(struct fs_context *fc) |
92abc475 | 233 | { |
ec10a24f | 234 | struct super_block *sb = fc->root->d_sb; |
92abc475 | 235 | |
02b9984d | 236 | sync_filesystem(sb); |
08cd274f | 237 | jffs2_update_mount_opts(fc); |
238 | ||
ec10a24f | 239 | return jffs2_do_remount_fs(sb, fc); |
92abc475 AS |
240 | } |
241 | ||
ee9b6d61 | 242 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
243 | { |
244 | .alloc_inode = jffs2_alloc_inode, | |
db0bd7b7 | 245 | .free_inode = jffs2_free_inode, |
1da177e4 | 246 | .put_super = jffs2_put_super, |
1da177e4 | 247 | .statfs = jffs2_statfs, |
b57922d9 | 248 | .evict_inode = jffs2_evict_inode, |
1da177e4 | 249 | .dirty_inode = jffs2_dirty_inode, |
92abc475 | 250 | .show_options = jffs2_show_options, |
1da177e4 LT |
251 | .sync_fs = jffs2_sync_fs, |
252 | }; | |
253 | ||
acaebfd8 DH |
254 | /* |
255 | * fill in the superblock | |
256 | */ | |
ec10a24f | 257 | static int jffs2_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 258 | { |
ec10a24f | 259 | struct jffs2_sb_info *c = sb->s_fs_info; |
db719222 | 260 | |
9c261b33 | 261 | jffs2_dbg(1, "jffs2_get_sb_mtd():" |
acaebfd8 | 262 | " New superblock for device %d (\"%s\")\n", |
9c261b33 | 263 | sb->s_mtd->index, sb->s_mtd->name); |
1da177e4 | 264 | |
acaebfd8 DH |
265 | c->mtd = sb->s_mtd; |
266 | c->os_priv = sb; | |
92abc475 | 267 | |
a61df3c4 JI |
268 | if (c->mount_opts.rp_size > c->mtd->size) |
269 | return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB", | |
270 | c->mtd->size / 1024); | |
271 | ||
acaebfd8 DH |
272 | /* Initialize JFFS2 superblock locks, the further initialization will |
273 | * be done later */ | |
ced22070 DW |
274 | mutex_init(&c->alloc_sem); |
275 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
276 | init_waitqueue_head(&c->erase_wait); |
277 | init_waitqueue_head(&c->inocache_wq); | |
278 | spin_lock_init(&c->erase_completion_lock); | |
279 | spin_lock_init(&c->inocache_lock); | |
280 | ||
1da177e4 | 281 | sb->s_op = &jffs2_super_operations; |
5f556aab | 282 | sb->s_export_op = &jffs2_export_ops; |
1751e8a6 | 283 | sb->s_flags = sb->s_flags | SB_NOATIME; |
aa98d7cf KK |
284 | sb->s_xattr = jffs2_xattr_handlers; |
285 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
1751e8a6 | 286 | sb->s_flags |= SB_POSIXACL; |
aa98d7cf | 287 | #endif |
ec10a24f DH |
288 | return jffs2_do_fill_super(sb, fc); |
289 | } | |
290 | ||
291 | static int jffs2_get_tree(struct fs_context *fc) | |
292 | { | |
293 | return get_tree_mtd(fc, jffs2_fill_super); | |
294 | } | |
295 | ||
296 | static void jffs2_free_fc(struct fs_context *fc) | |
297 | { | |
298 | kfree(fc->s_fs_info); | |
1da177e4 LT |
299 | } |
300 | ||
ec10a24f DH |
301 | static const struct fs_context_operations jffs2_context_ops = { |
302 | .free = jffs2_free_fc, | |
303 | .parse_param = jffs2_parse_param, | |
304 | .get_tree = jffs2_get_tree, | |
305 | .reconfigure = jffs2_reconfigure, | |
306 | }; | |
307 | ||
308 | static int jffs2_init_fs_context(struct fs_context *fc) | |
1da177e4 | 309 | { |
ec10a24f DH |
310 | struct jffs2_sb_info *ctx; |
311 | ||
312 | ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL); | |
313 | if (!ctx) | |
314 | return -ENOMEM; | |
315 | ||
316 | fc->s_fs_info = ctx; | |
317 | fc->ops = &jffs2_context_ops; | |
318 | return 0; | |
1da177e4 LT |
319 | } |
320 | ||
321 | static void jffs2_put_super (struct super_block *sb) | |
322 | { | |
323 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
324 | ||
9c261b33 | 325 | jffs2_dbg(2, "%s()\n", __func__); |
1da177e4 | 326 | |
ced22070 | 327 | mutex_lock(&c->alloc_sem); |
1da177e4 | 328 | jffs2_flush_wbuf_pad(c); |
ced22070 | 329 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
330 | |
331 | jffs2_sum_exit(c); | |
332 | ||
1da177e4 LT |
333 | jffs2_free_ino_caches(c); |
334 | jffs2_free_raw_node_refs(c); | |
1d5cfdb0 | 335 | kvfree(c->blocks); |
1da177e4 LT |
336 | jffs2_flash_cleanup(c); |
337 | kfree(c->inocache_list); | |
aa98d7cf | 338 | jffs2_clear_xattr_subsystem(c); |
327cf292 | 339 | mtd_sync(c->mtd); |
9c261b33 | 340 | jffs2_dbg(1, "%s(): returning\n", __func__); |
1da177e4 LT |
341 | } |
342 | ||
343 | static void jffs2_kill_sb(struct super_block *sb) | |
344 | { | |
345 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
c66b23c2 | 346 | if (c && !sb_rdonly(sb)) |
a69dde91 | 347 | jffs2_stop_garbage_collect_thread(c); |
acaebfd8 | 348 | kill_mtd_super(sb); |
1da177e4 LT |
349 | kfree(c); |
350 | } | |
351 | ||
352 | static struct file_system_type jffs2_fs_type = { | |
353 | .owner = THIS_MODULE, | |
354 | .name = "jffs2", | |
ec10a24f | 355 | .init_fs_context = jffs2_init_fs_context, |
d7167b14 | 356 | .parameters = jffs2_fs_parameters, |
1da177e4 LT |
357 | .kill_sb = jffs2_kill_sb, |
358 | }; | |
7f78e035 | 359 | MODULE_ALIAS_FS("jffs2"); |
1da177e4 LT |
360 | |
361 | static int __init init_jffs2_fs(void) | |
362 | { | |
363 | int ret; | |
364 | ||
3e68fbb5 DW |
365 | /* Paranoia checks for on-medium structures. If we ask GCC |
366 | to pack them with __attribute__((packed)) then it _also_ | |
367 | assumes that they're not aligned -- so it emits crappy | |
368 | code on some architectures. Ideally we want an attribute | |
369 | which means just 'no padding', without the alignment | |
370 | thing. But GCC doesn't have that -- we have to just | |
371 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
372 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
373 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
374 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
375 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 376 | |
5a528957 | 377 | pr_info("version 2.2." |
2f82ce1e | 378 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 379 | " (NAND)" |
e631ddba FH |
380 | #endif |
381 | #ifdef CONFIG_JFFS2_SUMMARY | |
382 | " (SUMMARY) " | |
1da177e4 | 383 | #endif |
c00c310e | 384 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
385 | |
386 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
387 | sizeof(struct jffs2_inode_info), | |
fffb60f9 | 388 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 389 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 390 | jffs2_i_init_once); |
1da177e4 | 391 | if (!jffs2_inode_cachep) { |
5a528957 | 392 | pr_err("error: Failed to initialise inode cache\n"); |
1da177e4 LT |
393 | return -ENOMEM; |
394 | } | |
395 | ret = jffs2_compressors_init(); | |
396 | if (ret) { | |
5a528957 | 397 | pr_err("error: Failed to initialise compressors\n"); |
1da177e4 LT |
398 | goto out; |
399 | } | |
400 | ret = jffs2_create_slab_caches(); | |
401 | if (ret) { | |
5a528957 | 402 | pr_err("error: Failed to initialise slab caches\n"); |
1da177e4 LT |
403 | goto out_compressors; |
404 | } | |
405 | ret = register_filesystem(&jffs2_fs_type); | |
406 | if (ret) { | |
5a528957 | 407 | pr_err("error: Failed to register filesystem\n"); |
1da177e4 LT |
408 | goto out_slab; |
409 | } | |
410 | return 0; | |
411 | ||
412 | out_slab: | |
413 | jffs2_destroy_slab_caches(); | |
414 | out_compressors: | |
415 | jffs2_compressors_exit(); | |
416 | out: | |
417 | kmem_cache_destroy(jffs2_inode_cachep); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | static void __exit exit_jffs2_fs(void) | |
422 | { | |
423 | unregister_filesystem(&jffs2_fs_type); | |
424 | jffs2_destroy_slab_caches(); | |
425 | jffs2_compressors_exit(); | |
8c0a8537 KS |
426 | |
427 | /* | |
428 | * Make sure all delayed rcu free inodes are flushed before we | |
429 | * destroy cache. | |
430 | */ | |
431 | rcu_barrier(); | |
1da177e4 LT |
432 | kmem_cache_destroy(jffs2_inode_cachep); |
433 | } | |
434 | ||
435 | module_init(init_jffs2_fs); | |
436 | module_exit(exit_jffs2_fs); | |
437 | ||
438 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
439 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 440 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 441 | // the sake of this tag. It's Free Software. |