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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 | ||
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 AB |
103 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
104 | cancel_delayed_work_sync(&c->wbuf_dwork); | |
105 | #endif | |
106 | ||
ced22070 | 107 | mutex_lock(&c->alloc_sem); |
1da177e4 | 108 | jffs2_flush_wbuf_pad(c); |
ced22070 | 109 | mutex_unlock(&c->alloc_sem); |
1da177e4 LT |
110 | return 0; |
111 | } | |
112 | ||
5f556aab DW |
113 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
114 | uint32_t generation) | |
115 | { | |
116 | /* We don't care about i_generation. We'll destroy the flash | |
117 | before we start re-using inode numbers anyway. And even | |
118 | if that wasn't true, we'd have other problems...*/ | |
119 | return jffs2_iget(sb, ino); | |
120 | } | |
121 | ||
122 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
123 | int fh_len, int fh_type) | |
124 | { | |
125 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
126 | jffs2_nfs_get_inode); | |
127 | } | |
128 | ||
129 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
130 | int fh_len, int fh_type) | |
131 | { | |
132 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
133 | jffs2_nfs_get_inode); | |
134 | } | |
135 | ||
136 | static struct dentry *jffs2_get_parent(struct dentry *child) | |
137 | { | |
138 | struct jffs2_inode_info *f; | |
139 | uint32_t pino; | |
140 | ||
e36cb0b8 | 141 | BUG_ON(!d_is_dir(child)); |
5f556aab DW |
142 | |
143 | f = JFFS2_INODE_INFO(child->d_inode); | |
144 | ||
145 | pino = f->inocache->pino_nlink; | |
146 | ||
147 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", | |
148 | f->inocache->ino, pino); | |
149 | ||
150 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); | |
151 | } | |
152 | ||
ac4cfdd6 | 153 | static const struct export_operations jffs2_export_ops = { |
5f556aab DW |
154 | .get_parent = jffs2_get_parent, |
155 | .fh_to_dentry = jffs2_fh_to_dentry, | |
156 | .fh_to_parent = jffs2_fh_to_parent, | |
157 | }; | |
158 | ||
92abc475 AS |
159 | /* |
160 | * JFFS2 mount options. | |
161 | * | |
162 | * Opt_override_compr: override default compressor | |
8da8ba2e | 163 | * Opt_rp_size: size of reserved pool in KiB |
92abc475 AS |
164 | * Opt_err: just end of array marker |
165 | */ | |
166 | enum { | |
167 | Opt_override_compr, | |
8da8ba2e | 168 | Opt_rp_size, |
92abc475 AS |
169 | Opt_err, |
170 | }; | |
171 | ||
172 | static const match_table_t tokens = { | |
173 | {Opt_override_compr, "compr=%s"}, | |
8da8ba2e | 174 | {Opt_rp_size, "rp_size=%u"}, |
92abc475 AS |
175 | {Opt_err, NULL}, |
176 | }; | |
177 | ||
178 | static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) | |
179 | { | |
180 | substring_t args[MAX_OPT_ARGS]; | |
181 | char *p, *name; | |
8da8ba2e | 182 | unsigned int opt; |
92abc475 AS |
183 | |
184 | if (!data) | |
185 | return 0; | |
186 | ||
187 | while ((p = strsep(&data, ","))) { | |
188 | int token; | |
189 | ||
190 | if (!*p) | |
191 | continue; | |
192 | ||
193 | token = match_token(p, tokens, args); | |
194 | switch (token) { | |
195 | case Opt_override_compr: | |
196 | name = match_strdup(&args[0]); | |
197 | ||
198 | if (!name) | |
199 | return -ENOMEM; | |
123005f3 | 200 | if (!strcmp(name, "none")) |
92abc475 | 201 | c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; |
123005f3 AS |
202 | #ifdef CONFIG_JFFS2_LZO |
203 | else if (!strcmp(name, "lzo")) | |
204 | c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; | |
205 | #endif | |
206 | #ifdef CONFIG_JFFS2_ZLIB | |
207 | else if (!strcmp(name, "zlib")) | |
208 | c->mount_opts.compr = | |
209 | JFFS2_COMPR_MODE_FORCEZLIB; | |
210 | #endif | |
211 | else { | |
5a528957 | 212 | pr_err("Error: unknown compressor \"%s\"\n", |
da320f05 | 213 | name); |
123005f3 AS |
214 | kfree(name); |
215 | return -EINVAL; | |
92abc475 AS |
216 | } |
217 | kfree(name); | |
123005f3 | 218 | c->mount_opts.override_compr = true; |
92abc475 | 219 | break; |
8da8ba2e DD |
220 | case Opt_rp_size: |
221 | if (match_int(&args[0], &opt)) | |
222 | return -EINVAL; | |
223 | opt *= 1024; | |
224 | if (opt > c->mtd->size) { | |
225 | pr_warn("Too large reserve pool specified, max " | |
226 | "is %llu KB\n", c->mtd->size / 1024); | |
227 | return -EINVAL; | |
228 | } | |
229 | c->mount_opts.rp_size = opt; | |
230 | break; | |
92abc475 | 231 | default: |
5a528957 | 232 | pr_err("Error: unrecognized mount option '%s' or missing value\n", |
da320f05 | 233 | p); |
92abc475 AS |
234 | return -EINVAL; |
235 | } | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) | |
242 | { | |
243 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
244 | int err; | |
245 | ||
02b9984d | 246 | sync_filesystem(sb); |
92abc475 AS |
247 | err = jffs2_parse_options(c, data); |
248 | if (err) | |
249 | return -EINVAL; | |
250 | ||
251 | return jffs2_do_remount_fs(sb, flags, data); | |
252 | } | |
253 | ||
ee9b6d61 | 254 | static const struct super_operations jffs2_super_operations = |
1da177e4 LT |
255 | { |
256 | .alloc_inode = jffs2_alloc_inode, | |
257 | .destroy_inode =jffs2_destroy_inode, | |
1da177e4 | 258 | .put_super = jffs2_put_super, |
1da177e4 LT |
259 | .statfs = jffs2_statfs, |
260 | .remount_fs = jffs2_remount_fs, | |
b57922d9 | 261 | .evict_inode = jffs2_evict_inode, |
1da177e4 | 262 | .dirty_inode = jffs2_dirty_inode, |
92abc475 | 263 | .show_options = jffs2_show_options, |
1da177e4 LT |
264 | .sync_fs = jffs2_sync_fs, |
265 | }; | |
266 | ||
acaebfd8 DH |
267 | /* |
268 | * fill in the superblock | |
269 | */ | |
270 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) | |
1da177e4 | 271 | { |
1da177e4 | 272 | struct jffs2_sb_info *c; |
db719222 JB |
273 | int ret; |
274 | ||
9c261b33 | 275 | jffs2_dbg(1, "jffs2_get_sb_mtd():" |
acaebfd8 | 276 | " New superblock for device %d (\"%s\")\n", |
9c261b33 | 277 | sb->s_mtd->index, sb->s_mtd->name); |
1da177e4 | 278 | |
f8314dc6 | 279 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
1a028dd2 | 280 | if (!c) |
454e2398 | 281 | return -ENOMEM; |
1da177e4 | 282 | |
acaebfd8 DH |
283 | c->mtd = sb->s_mtd; |
284 | c->os_priv = sb; | |
285 | sb->s_fs_info = c; | |
1da177e4 | 286 | |
92abc475 AS |
287 | ret = jffs2_parse_options(c, data); |
288 | if (ret) { | |
289 | kfree(c); | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
acaebfd8 DH |
293 | /* Initialize JFFS2 superblock locks, the further initialization will |
294 | * be done later */ | |
ced22070 DW |
295 | mutex_init(&c->alloc_sem); |
296 | mutex_init(&c->erase_free_sem); | |
b6220598 AB |
297 | init_waitqueue_head(&c->erase_wait); |
298 | init_waitqueue_head(&c->inocache_wq); | |
299 | spin_lock_init(&c->erase_completion_lock); | |
300 | spin_lock_init(&c->inocache_lock); | |
301 | ||
1da177e4 | 302 | sb->s_op = &jffs2_super_operations; |
5f556aab | 303 | sb->s_export_op = &jffs2_export_ops; |
acaebfd8 | 304 | sb->s_flags = sb->s_flags | MS_NOATIME; |
aa98d7cf KK |
305 | sb->s_xattr = jffs2_xattr_handlers; |
306 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
307 | sb->s_flags |= MS_POSIXACL; | |
308 | #endif | |
db719222 | 309 | ret = jffs2_do_fill_super(sb, data, silent); |
db719222 | 310 | return ret; |
1da177e4 LT |
311 | } |
312 | ||
848b83a5 | 313 | static struct dentry *jffs2_mount(struct file_system_type *fs_type, |
454e2398 | 314 | int flags, const char *dev_name, |
848b83a5 | 315 | void *data) |
1da177e4 | 316 | { |
848b83a5 | 317 | return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); |
1da177e4 LT |
318 | } |
319 | ||
320 | static void jffs2_put_super (struct super_block *sb) | |
321 | { | |
322 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
323 | ||
9c261b33 | 324 | jffs2_dbg(2, "%s()\n", __func__); |
1da177e4 | 325 | |
ced22070 | 326 | mutex_lock(&c->alloc_sem); |
1da177e4 | 327 | jffs2_flush_wbuf_pad(c); |
ced22070 | 328 | mutex_unlock(&c->alloc_sem); |
e631ddba FH |
329 | |
330 | jffs2_sum_exit(c); | |
331 | ||
1da177e4 LT |
332 | jffs2_free_ino_caches(c); |
333 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 334 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
335 | vfree(c->blocks); |
336 | else | |
337 | kfree(c->blocks); | |
338 | jffs2_flash_cleanup(c); | |
339 | kfree(c->inocache_list); | |
aa98d7cf | 340 | jffs2_clear_xattr_subsystem(c); |
327cf292 | 341 | mtd_sync(c->mtd); |
9c261b33 | 342 | jffs2_dbg(1, "%s(): returning\n", __func__); |
1da177e4 LT |
343 | } |
344 | ||
345 | static void jffs2_kill_sb(struct super_block *sb) | |
346 | { | |
347 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
348 | if (!(sb->s_flags & MS_RDONLY)) |
349 | jffs2_stop_garbage_collect_thread(c); | |
acaebfd8 | 350 | kill_mtd_super(sb); |
1da177e4 LT |
351 | kfree(c); |
352 | } | |
353 | ||
354 | static struct file_system_type jffs2_fs_type = { | |
355 | .owner = THIS_MODULE, | |
356 | .name = "jffs2", | |
848b83a5 | 357 | .mount = jffs2_mount, |
1da177e4 LT |
358 | .kill_sb = jffs2_kill_sb, |
359 | }; | |
7f78e035 | 360 | MODULE_ALIAS_FS("jffs2"); |
1da177e4 LT |
361 | |
362 | static int __init init_jffs2_fs(void) | |
363 | { | |
364 | int ret; | |
365 | ||
3e68fbb5 DW |
366 | /* Paranoia checks for on-medium structures. If we ask GCC |
367 | to pack them with __attribute__((packed)) then it _also_ | |
368 | assumes that they're not aligned -- so it emits crappy | |
369 | code on some architectures. Ideally we want an attribute | |
370 | which means just 'no padding', without the alignment | |
371 | thing. But GCC doesn't have that -- we have to just | |
372 | hope the structs are the right sizes, instead. */ | |
2ecd05ae AD |
373 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
374 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
375 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
376 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
3e68fbb5 | 377 | |
5a528957 | 378 | pr_info("version 2.2." |
2f82ce1e | 379 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 380 | " (NAND)" |
e631ddba FH |
381 | #endif |
382 | #ifdef CONFIG_JFFS2_SUMMARY | |
383 | " (SUMMARY) " | |
1da177e4 | 384 | #endif |
c00c310e | 385 | " © 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
386 | |
387 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
388 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
389 | 0, (SLAB_RECLAIM_ACCOUNT| |
390 | SLAB_MEM_SPREAD), | |
20c2df83 | 391 | jffs2_i_init_once); |
1da177e4 | 392 | if (!jffs2_inode_cachep) { |
5a528957 | 393 | pr_err("error: Failed to initialise inode cache\n"); |
1da177e4 LT |
394 | return -ENOMEM; |
395 | } | |
396 | ret = jffs2_compressors_init(); | |
397 | if (ret) { | |
5a528957 | 398 | pr_err("error: Failed to initialise compressors\n"); |
1da177e4 LT |
399 | goto out; |
400 | } | |
401 | ret = jffs2_create_slab_caches(); | |
402 | if (ret) { | |
5a528957 | 403 | pr_err("error: Failed to initialise slab caches\n"); |
1da177e4 LT |
404 | goto out_compressors; |
405 | } | |
406 | ret = register_filesystem(&jffs2_fs_type); | |
407 | if (ret) { | |
5a528957 | 408 | pr_err("error: Failed to register filesystem\n"); |
1da177e4 LT |
409 | goto out_slab; |
410 | } | |
411 | return 0; | |
412 | ||
413 | out_slab: | |
414 | jffs2_destroy_slab_caches(); | |
415 | out_compressors: | |
416 | jffs2_compressors_exit(); | |
417 | out: | |
418 | kmem_cache_destroy(jffs2_inode_cachep); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | static void __exit exit_jffs2_fs(void) | |
423 | { | |
424 | unregister_filesystem(&jffs2_fs_type); | |
425 | jffs2_destroy_slab_caches(); | |
426 | jffs2_compressors_exit(); | |
8c0a8537 KS |
427 | |
428 | /* | |
429 | * Make sure all delayed rcu free inodes are flushed before we | |
430 | * destroy cache. | |
431 | */ | |
432 | rcu_barrier(); | |
1da177e4 LT |
433 | kmem_cache_destroy(jffs2_inode_cachep); |
434 | } | |
435 | ||
436 | module_init(init_jffs2_fs); | |
437 | module_exit(exit_jffs2_fs); | |
438 | ||
439 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
440 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 441 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 442 | // the sake of this tag. It's Free Software. |