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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 | ||
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 | ||
01ba6875 CH |
66 | static void jffs2_write_super(struct super_block *sb) |
67 | { | |
68 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
ebc1ac16 CH |
69 | |
70 | lock_super(sb); | |
01ba6875 CH |
71 | sb->s_dirt = 0; |
72 | ||
ebc1ac16 | 73 | if (!(sb->s_flags & MS_RDONLY)) { |
9c261b33 | 74 | jffs2_dbg(1, "%s()\n", __func__); |
ebc1ac16 CH |
75 | jffs2_flush_wbuf_gc(c, 0); |
76 | } | |
01ba6875 | 77 | |
ebc1ac16 | 78 | unlock_super(sb); |
01ba6875 CH |
79 | } |
80 | ||
92abc475 AS |
81 | static const char *jffs2_compr_name(unsigned int compr) |
82 | { | |
83 | switch (compr) { | |
84 | case JFFS2_COMPR_MODE_NONE: | |
85 | return "none"; | |
123005f3 AS |
86 | #ifdef CONFIG_JFFS2_LZO |
87 | case JFFS2_COMPR_MODE_FORCELZO: | |
88 | return "lzo"; | |
89 | #endif | |
90 | #ifdef CONFIG_JFFS2_ZLIB | |
91 | case JFFS2_COMPR_MODE_FORCEZLIB: | |
92 | return "zlib"; | |
93 | #endif | |
92abc475 AS |
94 | default: |
95 | /* should never happen; programmer error */ | |
96 | WARN_ON(1); | |
97 | return ""; | |
98 | } | |
99 | } | |
100 | ||
34c80b1d | 101 | static int jffs2_show_options(struct seq_file *s, struct dentry *root) |
92abc475 | 102 | { |
34c80b1d | 103 | struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb); |
92abc475 AS |
104 | struct jffs2_mount_opts *opts = &c->mount_opts; |
105 | ||
106 | if (opts->override_compr) | |
107 | seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr)); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
113 | { | |
114 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
115 | ||
d579ed00 CH |
116 | jffs2_write_super(sb); |
117 | ||
ced22070 | 118 | mutex_lock(&c->alloc_sem); |
1da177e4 | 119 | jffs2_flush_wbuf_pad(c); |
ced22070 | 120 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
121 | return 0; |
122 | } | |
123 | ||
5f556aab DW |
124 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
125 | uint32_t generation) | |
126 | { | |
127 | /* We don't care about i_generation. We'll destroy the flash | |
128 | before we start re-using inode numbers anyway. And even | |
129 | if that wasn't true, we'd have other problems...*/ | |
130 | return jffs2_iget(sb, ino); | |
131 | } | |
132 | ||
133 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
134 | int fh_len, int fh_type) | |
135 | { | |
136 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
137 | jffs2_nfs_get_inode); | |
138 | } | |
139 | ||
140 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
141 | int fh_len, int fh_type) | |
142 | { | |
143 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
144 | jffs2_nfs_get_inode); | |
145 | } | |
146 | ||
147 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
148 | { | |
149 | struct jffs2_inode_info *f; | |
150 | uint32_t pino; | |
151 | ||
152 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); | |
153 | ||
154 | f = JFFS2_INODE_INFO(child->d_inode); | |
155 | ||
156 | pino = f->inocache->pino_nlink; | |
157 | ||
158 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
159 | f->inocache->ino, pino); | |
160 | ||
161 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); | |
162 | } | |
163 | ||
ac4cfdd6 | 164 | static const struct export_operations jffs2_export_ops = { |
5f556aab DW |
165 | .get_parent = jffs2_get_parent, |
166 | .fh_to_dentry = jffs2_fh_to_dentry, | |
167 | .fh_to_parent = jffs2_fh_to_parent, | |
168 | }; | |
169 | ||
92abc475 AS |
170 | /* |
171 | * JFFS2 mount options. | |
172 | * | |
173 | * Opt_override_compr: override default compressor | |
174 | * Opt_err: just end of array marker | |
175 | */ | |
176 | enum { | |
177 | Opt_override_compr, | |
178 | Opt_err, | |
179 | }; | |
180 | ||
181 | static const match_table_t tokens = { | |
182 | {Opt_override_compr, "compr=%s"}, | |
183 | {Opt_err, NULL}, | |
184 | }; | |
185 | ||
186 | static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) | |
187 | { | |
188 | substring_t args[MAX_OPT_ARGS]; | |
189 | char *p, *name; | |
190 | ||
191 | if (!data) | |
192 | return 0; | |
193 | ||
194 | while ((p = strsep(&data, ","))) { | |
195 | int token; | |
196 | ||
197 | if (!*p) | |
198 | continue; | |
199 | ||
200 | token = match_token(p, tokens, args); | |
201 | switch (token) { | |
202 | case Opt_override_compr: | |
203 | name = match_strdup(&args[0]); | |
204 | ||
205 | if (!name) | |
206 | return -ENOMEM; | |
123005f3 | 207 | if (!strcmp(name, "none")) |
92abc475 | 208 | c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; |
123005f3 AS |
209 | #ifdef CONFIG_JFFS2_LZO |
210 | else if (!strcmp(name, "lzo")) | |
211 | c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; | |
212 | #endif | |
213 | #ifdef CONFIG_JFFS2_ZLIB | |
214 | else if (!strcmp(name, "zlib")) | |
215 | c->mount_opts.compr = | |
216 | JFFS2_COMPR_MODE_FORCEZLIB; | |
217 | #endif | |
218 | else { | |
5a528957 | 219 | pr_err("Error: unknown compressor \"%s\"\n", |
da320f05 | 220 | name); |
123005f3 AS |
221 | kfree(name); |
222 | return -EINVAL; | |
92abc475 AS |
223 | } |
224 | kfree(name); | |
123005f3 | 225 | c->mount_opts.override_compr = true; |
92abc475 AS |
226 | break; |
227 | default: | |
5a528957 | 228 | pr_err("Error: unrecognized mount option '%s' or missing value\n", |
da320f05 | 229 | p); |
92abc475 AS |
230 | return -EINVAL; |
231 | } | |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) | |
238 | { | |
239 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
240 | int err; | |
241 | ||
242 | err = jffs2_parse_options(c, data); | |
243 | if (err) | |
244 | return -EINVAL; | |
245 | ||
246 | return jffs2_do_remount_fs(sb, flags, data); | |
247 | } | |
248 | ||
ee9b6d61 | 249 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
250 | { |
251 | .alloc_inode = jffs2_alloc_inode, | |
252 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 LT |
253 | .put_super = jffs2_put_super, |
254 | .write_super = jffs2_write_super, | |
255 | .statfs = jffs2_statfs, | |
256 | .remount_fs = jffs2_remount_fs, | |
b57922d9 | 257 | .evict_inode = jffs2_evict_inode, |
1da177e4 | 258 | .dirty_inode = jffs2_dirty_inode, |
92abc475 | 259 | .show_options = jffs2_show_options, |
1da177e4 LT |
260 | .sync_fs = jffs2_sync_fs, |
261 | }; | |
262 | ||
acaebfd8 DH |
263 | /* |
264 | * fill in the superblock | |
265 | */ | |
266 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 267 | { |
1da177e4 | 268 | struct jffs2_sb_info *c; |
db719222 JB |
269 | int ret; |
270 | ||
9c261b33 | 271 | jffs2_dbg(1, "jffs2_get_sb_mtd():" |
acaebfd8 | 272 | " New superblock for device %d (\"%s\")\n", |
9c261b33 | 273 | sb->s_mtd->index, sb->s_mtd->name); |
1da177e4 | 274 | |
f8314dc6 | 275 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1a028dd2 | 276 | if (!c) |
454e2398 | 277 | return -ENOMEM; |
1da177e4 | 278 | |
acaebfd8 DH |
279 | c->mtd = sb->s_mtd; |
280 | c->os_priv = sb; | |
281 | sb->s_fs_info = c; | |
1da177e4 | 282 | |
92abc475 AS |
283 | ret = jffs2_parse_options(c, data); |
284 | if (ret) { | |
285 | kfree(c); | |
286 | return -EINVAL; | |
287 | } | |
288 | ||
acaebfd8 DH |
289 | /* Initialize JFFS2 superblock locks, the further initialization will |
290 | * be done later */ | |
ced22070 DW |
291 | mutex_init(&c->alloc_sem); |
292 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
293 | init_waitqueue_head(&c->erase_wait); |
294 | init_waitqueue_head(&c->inocache_wq); | |
295 | spin_lock_init(&c->erase_completion_lock); | |
296 | spin_lock_init(&c->inocache_lock); | |
297 | ||
1da177e4 | 298 | sb->s_op = &jffs2_super_operations; |
5f556aab | 299 | sb->s_export_op = &jffs2_export_ops; |
acaebfd8 | 300 | sb->s_flags = sb->s_flags | MS_NOATIME; |
aa98d7cf KK |
301 | sb->s_xattr = jffs2_xattr_handlers; |
302 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
303 | sb->s_flags |= MS_POSIXACL; | |
304 | #endif | |
db719222 | 305 | ret = jffs2_do_fill_super(sb, data, silent); |
db719222 | 306 | return ret; |
1da177e4 LT |
307 | } |
308 | ||
848b83a5 | 309 | static struct dentry *jffs2_mount(struct file_system_type *fs_type, |
454e2398 | 310 | int flags, const char *dev_name, |
848b83a5 | 311 | void *data) |
1da177e4 | 312 | { |
848b83a5 | 313 | return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); |
1da177e4 LT |
314 | } |
315 | ||
316 | static void jffs2_put_super (struct super_block *sb) | |
317 | { | |
318 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
319 | ||
9c261b33 | 320 | jffs2_dbg(2, "%s()\n", __func__); |
1da177e4 | 321 | |
8c85e125 CH |
322 | if (sb->s_dirt) |
323 | jffs2_write_super(sb); | |
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); | |
4ce1f562 | 333 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
334 | vfree(c->blocks); |
335 | else | |
336 | kfree(c->blocks); | |
337 | jffs2_flash_cleanup(c); | |
338 | kfree(c->inocache_list); | |
aa98d7cf | 339 | jffs2_clear_xattr_subsystem(c); |
327cf292 | 340 | mtd_sync(c->mtd); |
9c261b33 | 341 | jffs2_dbg(1, "%s(): returning\n", __func__); |
1da177e4 LT |
342 | } |
343 | ||
344 | static void jffs2_kill_sb(struct super_block *sb) | |
345 | { | |
346 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
347 | if (!(sb->s_flags & MS_RDONLY)) |
348 | jffs2_stop_garbage_collect_thread(c); | |
acaebfd8 | 349 | kill_mtd_super(sb); |
1da177e4 LT |
350 | kfree(c); |
351 | } | |
352 | ||
353 | static struct file_system_type jffs2_fs_type = { | |
354 | .owner = THIS_MODULE, | |
355 | .name = "jffs2", | |
848b83a5 | 356 | .mount = jffs2_mount, |
1da177e4 LT |
357 | .kill_sb = jffs2_kill_sb, |
358 | }; | |
359 | ||
360 | static int __init init_jffs2_fs(void) | |
361 | { | |
362 | int ret; | |
363 | ||
3e68fbb5 DW |
364 | /* Paranoia checks for on-medium structures. If we ask GCC |
365 | to pack them with __attribute__((packed)) then it _also_ | |
366 | assumes that they're not aligned -- so it emits crappy | |
367 | code on some architectures. Ideally we want an attribute | |
368 | which means just 'no padding', without the alignment | |
369 | thing. But GCC doesn't have that -- we have to just | |
370 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
371 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
372 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
373 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
374 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 375 | |
5a528957 | 376 | pr_info("version 2.2." |
2f82ce1e | 377 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 378 | " (NAND)" |
e631ddba FH |
379 | #endif |
380 | #ifdef CONFIG_JFFS2_SUMMARY | |
381 | " (SUMMARY) " | |
1da177e4 | 382 | #endif |
c00c310e | 383 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
384 | |
385 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
386 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
387 | 0, (SLAB_RECLAIM_ACCOUNT| |
388 | SLAB_MEM_SPREAD), | |
20c2df83 | 389 | jffs2_i_init_once); |
1da177e4 | 390 | if (!jffs2_inode_cachep) { |
5a528957 | 391 | pr_err("error: Failed to initialise inode cache\n"); |
1da177e4 LT |
392 | return -ENOMEM; |
393 | } | |
394 | ret = jffs2_compressors_init(); | |
395 | if (ret) { | |
5a528957 | 396 | pr_err("error: Failed to initialise compressors\n"); |
1da177e4 LT |
397 | goto out; |
398 | } | |
399 | ret = jffs2_create_slab_caches(); | |
400 | if (ret) { | |
5a528957 | 401 | pr_err("error: Failed to initialise slab caches\n"); |
1da177e4 LT |
402 | goto out_compressors; |
403 | } | |
404 | ret = register_filesystem(&jffs2_fs_type); | |
405 | if (ret) { | |
5a528957 | 406 | pr_err("error: Failed to register filesystem\n"); |
1da177e4 LT |
407 | goto out_slab; |
408 | } | |
409 | return 0; | |
410 | ||
411 | out_slab: | |
412 | jffs2_destroy_slab_caches(); | |
413 | out_compressors: | |
414 | jffs2_compressors_exit(); | |
415 | out: | |
416 | kmem_cache_destroy(jffs2_inode_cachep); | |
417 | return ret; | |
418 | } | |
419 | ||
420 | static void __exit exit_jffs2_fs(void) | |
421 | { | |
422 | unregister_filesystem(&jffs2_fs_type); | |
423 | jffs2_destroy_slab_caches(); | |
424 | jffs2_compressors_exit(); | |
425 | kmem_cache_destroy(jffs2_inode_cachep); | |
426 | } | |
427 | ||
428 | module_init(init_jffs2_fs); | |
429 | module_exit(exit_jffs2_fs); | |
430 | ||
431 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
432 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 433 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 434 | // the sake of this tag. It's Free Software. |