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> |
92abc475 | 22 | #include <linux/parser.h> |
1da177e4 LT |
23 | #include <linux/jffs2.h> |
24 | #include <linux/pagemap.h> | |
acaebfd8 | 25 | #include <linux/mtd/super.h> |
1da177e4 LT |
26 | #include <linux/ctype.h> |
27 | #include <linux/namei.h> | |
92abc475 | 28 | #include <linux/seq_file.h> |
5f556aab | 29 | #include <linux/exportfs.h> |
1da177e4 LT |
30 | #include "compr.h" |
31 | #include "nodelist.h" | |
32 | ||
33 | static void jffs2_put_super(struct super_block *); | |
34 | ||
e18b890b | 35 | static struct kmem_cache *jffs2_inode_cachep; |
1da177e4 LT |
36 | |
37 | static struct inode *jffs2_alloc_inode(struct super_block *sb) | |
38 | { | |
4e571aba DW |
39 | struct jffs2_inode_info *f; |
40 | ||
41 | f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); | |
42 | if (!f) | |
1da177e4 | 43 | return NULL; |
4e571aba | 44 | return &f->vfs_inode; |
1da177e4 LT |
45 | } |
46 | ||
fa0d7e3d | 47 | static void jffs2_i_callback(struct rcu_head *head) |
1da177e4 | 48 | { |
fa0d7e3d | 49 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
50 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); |
51 | } | |
52 | ||
fa0d7e3d NP |
53 | static void jffs2_destroy_inode(struct inode *inode) |
54 | { | |
55 | call_rcu(&inode->i_rcu, jffs2_i_callback); | |
56 | } | |
57 | ||
51cc5068 | 58 | static void jffs2_i_init_once(void *foo) |
1da177e4 | 59 | { |
4e571aba | 60 | struct jffs2_inode_info *f = foo; |
1da177e4 | 61 | |
4e571aba DW |
62 | mutex_init(&f->sem); |
63 | inode_init_once(&f->vfs_inode); | |
1da177e4 LT |
64 | } |
65 | ||
92abc475 AS |
66 | static const char *jffs2_compr_name(unsigned int compr) |
67 | { | |
68 | switch (compr) { | |
69 | case JFFS2_COMPR_MODE_NONE: | |
70 | return "none"; | |
123005f3 AS |
71 | #ifdef CONFIG_JFFS2_LZO |
72 | case JFFS2_COMPR_MODE_FORCELZO: | |
73 | return "lzo"; | |
74 | #endif | |
75 | #ifdef CONFIG_JFFS2_ZLIB | |
76 | case JFFS2_COMPR_MODE_FORCEZLIB: | |
77 | return "zlib"; | |
78 | #endif | |
92abc475 AS |
79 | default: |
80 | /* should never happen; programmer error */ | |
81 | WARN_ON(1); | |
82 | return ""; | |
83 | } | |
84 | } | |
85 | ||
34c80b1d | 86 | static int jffs2_show_options(struct seq_file *s, struct dentry *root) |
92abc475 | 87 | { |
34c80b1d | 88 | struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb); |
92abc475 AS |
89 | struct jffs2_mount_opts *opts = &c->mount_opts; |
90 | ||
91 | if (opts->override_compr) | |
92 | seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr)); | |
8da8ba2e DD |
93 | if (opts->rp_size) |
94 | seq_printf(s, ",rp_size=%u", opts->rp_size / 1024); | |
92abc475 AS |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
1da177e4 LT |
99 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
100 | { | |
101 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
102 | ||
a445f784 | 103 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
a788c527 DS |
104 | if (jffs2_is_writebuffered(c)) |
105 | cancel_delayed_work_sync(&c->wbuf_dwork); | |
a445f784 AB |
106 | #endif |
107 | ||
ced22070 | 108 | mutex_lock(&c->alloc_sem); |
1da177e4 | 109 | jffs2_flush_wbuf_pad(c); |
ced22070 | 110 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
111 | return 0; |
112 | } | |
113 | ||
5f556aab DW |
114 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
115 | uint32_t generation) | |
116 | { | |
117 | /* We don't care about i_generation. We'll destroy the flash | |
118 | before we start re-using inode numbers anyway. And even | |
119 | if that wasn't true, we'd have other problems...*/ | |
120 | return jffs2_iget(sb, ino); | |
121 | } | |
122 | ||
123 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
124 | int fh_len, int fh_type) | |
125 | { | |
126 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
127 | jffs2_nfs_get_inode); | |
128 | } | |
129 | ||
130 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
131 | int fh_len, int fh_type) | |
132 | { | |
133 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
134 | jffs2_nfs_get_inode); | |
135 | } | |
136 | ||
137 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
138 | { | |
139 | struct jffs2_inode_info *f; | |
140 | uint32_t pino; | |
141 | ||
e36cb0b8 | 142 | BUG_ON(!d_is_dir(child)); |
5f556aab | 143 | |
2b0143b5 | 144 | f = JFFS2_INODE_INFO(d_inode(child)); |
5f556aab DW |
145 | |
146 | pino = f->inocache->pino_nlink; | |
147 | ||
148 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
149 | f->inocache->ino, pino); | |
150 | ||
fc64005c | 151 | return d_obtain_alias(jffs2_iget(child->d_sb, pino)); |
5f556aab DW |
152 | } |
153 | ||
ac4cfdd6 | 154 | static const struct export_operations jffs2_export_ops = { |
5f556aab DW |
155 | .get_parent = jffs2_get_parent, |
156 | .fh_to_dentry = jffs2_fh_to_dentry, | |
157 | .fh_to_parent = jffs2_fh_to_parent, | |
158 | }; | |
159 | ||
92abc475 AS |
160 | /* |
161 | * JFFS2 mount options. | |
162 | * | |
163 | * Opt_override_compr: override default compressor | |
8da8ba2e | 164 | * Opt_rp_size: size of reserved pool in KiB |
92abc475 AS |
165 | * Opt_err: just end of array marker |
166 | */ | |
167 | enum { | |
168 | Opt_override_compr, | |
8da8ba2e | 169 | Opt_rp_size, |
92abc475 AS |
170 | Opt_err, |
171 | }; | |
172 | ||
173 | static const match_table_t tokens = { | |
174 | {Opt_override_compr, "compr=%s"}, | |
8da8ba2e | 175 | {Opt_rp_size, "rp_size=%u"}, |
92abc475 AS |
176 | {Opt_err, NULL}, |
177 | }; | |
178 | ||
179 | static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) | |
180 | { | |
181 | substring_t args[MAX_OPT_ARGS]; | |
182 | char *p, *name; | |
8da8ba2e | 183 | unsigned int opt; |
92abc475 AS |
184 | |
185 | if (!data) | |
186 | return 0; | |
187 | ||
188 | while ((p = strsep(&data, ","))) { | |
189 | int token; | |
190 | ||
191 | if (!*p) | |
192 | continue; | |
193 | ||
194 | token = match_token(p, tokens, args); | |
195 | switch (token) { | |
196 | case Opt_override_compr: | |
197 | name = match_strdup(&args[0]); | |
198 | ||
199 | if (!name) | |
200 | return -ENOMEM; | |
123005f3 | 201 | if (!strcmp(name, "none")) |
92abc475 | 202 | c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; |
123005f3 AS |
203 | #ifdef CONFIG_JFFS2_LZO |
204 | else if (!strcmp(name, "lzo")) | |
205 | c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; | |
206 | #endif | |
207 | #ifdef CONFIG_JFFS2_ZLIB | |
208 | else if (!strcmp(name, "zlib")) | |
209 | c->mount_opts.compr = | |
210 | JFFS2_COMPR_MODE_FORCEZLIB; | |
211 | #endif | |
212 | else { | |
5a528957 | 213 | pr_err("Error: unknown compressor \"%s\"\n", |
da320f05 | 214 | name); |
123005f3 AS |
215 | kfree(name); |
216 | return -EINVAL; | |
92abc475 AS |
217 | } |
218 | kfree(name); | |
123005f3 | 219 | c->mount_opts.override_compr = true; |
92abc475 | 220 | break; |
8da8ba2e DD |
221 | case Opt_rp_size: |
222 | if (match_int(&args[0], &opt)) | |
223 | return -EINVAL; | |
224 | opt *= 1024; | |
225 | if (opt > c->mtd->size) { | |
226 | pr_warn("Too large reserve pool specified, max " | |
227 | "is %llu KB\n", c->mtd->size / 1024); | |
228 | return -EINVAL; | |
229 | } | |
230 | c->mount_opts.rp_size = opt; | |
231 | break; | |
92abc475 | 232 | default: |
5a528957 | 233 | pr_err("Error: unrecognized mount option '%s' or missing value\n", |
da320f05 | 234 | p); |
92abc475 AS |
235 | return -EINVAL; |
236 | } | |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) | |
243 | { | |
244 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
245 | int err; | |
246 | ||
02b9984d | 247 | sync_filesystem(sb); |
92abc475 AS |
248 | err = jffs2_parse_options(c, data); |
249 | if (err) | |
250 | return -EINVAL; | |
251 | ||
252 | return jffs2_do_remount_fs(sb, flags, data); | |
253 | } | |
254 | ||
ee9b6d61 | 255 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
256 | { |
257 | .alloc_inode = jffs2_alloc_inode, | |
258 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 | 259 | .put_super = jffs2_put_super, |
1da177e4 LT |
260 | .statfs = jffs2_statfs, |
261 | .remount_fs = jffs2_remount_fs, | |
b57922d9 | 262 | .evict_inode = jffs2_evict_inode, |
1da177e4 | 263 | .dirty_inode = jffs2_dirty_inode, |
92abc475 | 264 | .show_options = jffs2_show_options, |
1da177e4 LT |
265 | .sync_fs = jffs2_sync_fs, |
266 | }; | |
267 | ||
acaebfd8 DH |
268 | /* |
269 | * fill in the superblock | |
270 | */ | |
271 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 272 | { |
1da177e4 | 273 | struct jffs2_sb_info *c; |
db719222 JB |
274 | int ret; |
275 | ||
9c261b33 | 276 | jffs2_dbg(1, "jffs2_get_sb_mtd():" |
acaebfd8 | 277 | " New superblock for device %d (\"%s\")\n", |
9c261b33 | 278 | sb->s_mtd->index, sb->s_mtd->name); |
1da177e4 | 279 | |
f8314dc6 | 280 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1a028dd2 | 281 | if (!c) |
454e2398 | 282 | return -ENOMEM; |
1da177e4 | 283 | |
acaebfd8 DH |
284 | c->mtd = sb->s_mtd; |
285 | c->os_priv = sb; | |
286 | sb->s_fs_info = c; | |
1da177e4 | 287 | |
92abc475 | 288 | ret = jffs2_parse_options(c, data); |
92e2921f | 289 | if (ret) |
92abc475 | 290 | return -EINVAL; |
92abc475 | 291 | |
acaebfd8 DH |
292 | /* Initialize JFFS2 superblock locks, the further initialization will |
293 | * be done later */ | |
ced22070 DW |
294 | mutex_init(&c->alloc_sem); |
295 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
296 | init_waitqueue_head(&c->erase_wait); |
297 | init_waitqueue_head(&c->inocache_wq); | |
298 | spin_lock_init(&c->erase_completion_lock); | |
299 | spin_lock_init(&c->inocache_lock); | |
300 | ||
1da177e4 | 301 | sb->s_op = &jffs2_super_operations; |
5f556aab | 302 | sb->s_export_op = &jffs2_export_ops; |
1751e8a6 | 303 | sb->s_flags = sb->s_flags | SB_NOATIME; |
aa98d7cf KK |
304 | sb->s_xattr = jffs2_xattr_handlers; |
305 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
1751e8a6 | 306 | sb->s_flags |= SB_POSIXACL; |
aa98d7cf | 307 | #endif |
db719222 | 308 | ret = jffs2_do_fill_super(sb, data, silent); |
db719222 | 309 | return ret; |
1da177e4 LT |
310 | } |
311 | ||
848b83a5 | 312 | static struct dentry *jffs2_mount(struct file_system_type *fs_type, |
454e2398 | 313 | int flags, const char *dev_name, |
848b83a5 | 314 | void *data) |
1da177e4 | 315 | { |
848b83a5 | 316 | return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); |
1da177e4 LT |
317 | } |
318 | ||
319 | static void jffs2_put_super (struct super_block *sb) | |
320 | { | |
321 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
322 | ||
9c261b33 | 323 | jffs2_dbg(2, "%s()\n", __func__); |
1da177e4 | 324 | |
ced22070 | 325 | mutex_lock(&c->alloc_sem); |
1da177e4 | 326 | jffs2_flush_wbuf_pad(c); |
ced22070 | 327 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
328 | |
329 | jffs2_sum_exit(c); | |
330 | ||
1da177e4 LT |
331 | jffs2_free_ino_caches(c); |
332 | jffs2_free_raw_node_refs(c); | |
1d5cfdb0 | 333 | kvfree(c->blocks); |
1da177e4 LT |
334 | jffs2_flash_cleanup(c); |
335 | kfree(c->inocache_list); | |
aa98d7cf | 336 | jffs2_clear_xattr_subsystem(c); |
327cf292 | 337 | mtd_sync(c->mtd); |
9c261b33 | 338 | jffs2_dbg(1, "%s(): returning\n", __func__); |
1da177e4 LT |
339 | } |
340 | ||
341 | static void jffs2_kill_sb(struct super_block *sb) | |
342 | { | |
343 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
c66b23c2 | 344 | if (c && !sb_rdonly(sb)) |
a69dde91 | 345 | jffs2_stop_garbage_collect_thread(c); |
acaebfd8 | 346 | kill_mtd_super(sb); |
1da177e4 LT |
347 | kfree(c); |
348 | } | |
349 | ||
350 | static struct file_system_type jffs2_fs_type = { | |
351 | .owner = THIS_MODULE, | |
352 | .name = "jffs2", | |
848b83a5 | 353 | .mount = jffs2_mount, |
1da177e4 LT |
354 | .kill_sb = jffs2_kill_sb, |
355 | }; | |
7f78e035 | 356 | MODULE_ALIAS_FS("jffs2"); |
1da177e4 LT |
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 | |
5a528957 | 374 | pr_info("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 | 385 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 386 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 387 | jffs2_i_init_once); |
1da177e4 | 388 | if (!jffs2_inode_cachep) { |
5a528957 | 389 | pr_err("error: Failed to initialise inode cache\n"); |
1da177e4 LT |
390 | return -ENOMEM; |
391 | } | |
392 | ret = jffs2_compressors_init(); | |
393 | if (ret) { | |
5a528957 | 394 | pr_err("error: Failed to initialise compressors\n"); |
1da177e4 LT |
395 | goto out; |
396 | } | |
397 | ret = jffs2_create_slab_caches(); | |
398 | if (ret) { | |
5a528957 | 399 | pr_err("error: Failed to initialise slab caches\n"); |
1da177e4 LT |
400 | goto out_compressors; |
401 | } | |
402 | ret = register_filesystem(&jffs2_fs_type); | |
403 | if (ret) { | |
5a528957 | 404 | pr_err("error: Failed to register filesystem\n"); |
1da177e4 LT |
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(); | |
8c0a8537 KS |
423 | |
424 | /* | |
425 | * Make sure all delayed rcu free inodes are flushed before we | |
426 | * destroy cache. | |
427 | */ | |
428 | rcu_barrier(); | |
1da177e4 LT |
429 | kmem_cache_destroy(jffs2_inode_cachep); |
430 | } | |
431 | ||
432 | module_init(init_jffs2_fs); | |
433 | module_exit(exit_jffs2_fs); | |
434 | ||
435 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
436 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 437 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 438 | // the sake of this tag. It's Free Software. |