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12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
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>
20#include <linux/err.h>
21#include <linux/mount.h>
22#include <linux/parser.h>
23#include <linux/jffs2.h>
24#include <linux/pagemap.h>
25#include <linux/mtd/super.h>
26#include <linux/ctype.h>
27#include <linux/namei.h>
28#include <linux/seq_file.h>
29#include <linux/exportfs.h>
30#include "compr.h"
31#include "nodelist.h"
32
33static void jffs2_put_super(struct super_block *);
34
35static struct kmem_cache *jffs2_inode_cachep;
36
37static struct inode *jffs2_alloc_inode(struct super_block *sb)
38{
39 struct jffs2_inode_info *f;
40
41 f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
42 if (!f)
43 return NULL;
44 return &f->vfs_inode;
45}
46
47static void jffs2_i_callback(struct rcu_head *head)
48{
49 struct inode *inode = container_of(head, struct inode, i_rcu);
50 kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
51}
52
53static void jffs2_destroy_inode(struct inode *inode)
54{
55 call_rcu(&inode->i_rcu, jffs2_i_callback);
56}
57
58static void jffs2_i_init_once(void *foo)
59{
60 struct jffs2_inode_info *f = foo;
61
62 mutex_init(&f->sem);
63 inode_init_once(&f->vfs_inode);
64}
65
66static const char *jffs2_compr_name(unsigned int compr)
67{
68 switch (compr) {
69 case JFFS2_COMPR_MODE_NONE:
70 return "none";
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
79 default:
80
81 WARN_ON(1);
82 return "";
83 }
84}
85
86static int jffs2_show_options(struct seq_file *s, struct dentry *root)
87{
88 struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
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));
93 if (opts->rp_size)
94 seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
95
96 return 0;
97}
98
99static int jffs2_sync_fs(struct super_block *sb, int wait)
100{
101 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
102
103#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
104 cancel_delayed_work_sync(&c->wbuf_dwork);
105#endif
106
107 mutex_lock(&c->alloc_sem);
108 jffs2_flush_wbuf_pad(c);
109 mutex_unlock(&c->alloc_sem);
110 return 0;
111}
112
113static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
114 uint32_t generation)
115{
116
117
118
119 return jffs2_iget(sb, ino);
120}
121
122static 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
129static 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
136static struct dentry *jffs2_get_parent(struct dentry *child)
137{
138 struct jffs2_inode_info *f;
139 uint32_t pino;
140
141 BUG_ON(!d_is_dir(child));
142
143 f = JFFS2_INODE_INFO(d_inode(child));
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(d_inode(child)->i_sb, pino));
151}
152
153static const struct export_operations jffs2_export_ops = {
154 .get_parent = jffs2_get_parent,
155 .fh_to_dentry = jffs2_fh_to_dentry,
156 .fh_to_parent = jffs2_fh_to_parent,
157};
158
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162
163
164
165
166enum {
167 Opt_override_compr,
168 Opt_rp_size,
169 Opt_err,
170};
171
172static const match_table_t tokens = {
173 {Opt_override_compr, "compr=%s"},
174 {Opt_rp_size, "rp_size=%u"},
175 {Opt_err, NULL},
176};
177
178static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
179{
180 substring_t args[MAX_OPT_ARGS];
181 char *p, *name;
182 unsigned int opt;
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;
200 if (!strcmp(name, "none"))
201 c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
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 {
212 pr_err("Error: unknown compressor \"%s\"\n",
213 name);
214 kfree(name);
215 return -EINVAL;
216 }
217 kfree(name);
218 c->mount_opts.override_compr = true;
219 break;
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;
231 default:
232 pr_err("Error: unrecognized mount option '%s' or missing value\n",
233 p);
234 return -EINVAL;
235 }
236 }
237
238 return 0;
239}
240
241static 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
246 sync_filesystem(sb);
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
254static const struct super_operations jffs2_super_operations =
255{
256 .alloc_inode = jffs2_alloc_inode,
257 .destroy_inode =jffs2_destroy_inode,
258 .put_super = jffs2_put_super,
259 .statfs = jffs2_statfs,
260 .remount_fs = jffs2_remount_fs,
261 .evict_inode = jffs2_evict_inode,
262 .dirty_inode = jffs2_dirty_inode,
263 .show_options = jffs2_show_options,
264 .sync_fs = jffs2_sync_fs,
265};
266
267
268
269
270static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
271{
272 struct jffs2_sb_info *c;
273 int ret;
274
275 jffs2_dbg(1, "jffs2_get_sb_mtd():"
276 " New superblock for device %d (\"%s\")\n",
277 sb->s_mtd->index, sb->s_mtd->name);
278
279 c = kzalloc(sizeof(*c), GFP_KERNEL);
280 if (!c)
281 return -ENOMEM;
282
283 c->mtd = sb->s_mtd;
284 c->os_priv = sb;
285 sb->s_fs_info = c;
286
287 ret = jffs2_parse_options(c, data);
288 if (ret) {
289 kfree(c);
290 return -EINVAL;
291 }
292
293
294
295 mutex_init(&c->alloc_sem);
296 mutex_init(&c->erase_free_sem);
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
302 sb->s_op = &jffs2_super_operations;
303 sb->s_export_op = &jffs2_export_ops;
304 sb->s_flags = sb->s_flags | MS_NOATIME;
305 sb->s_xattr = jffs2_xattr_handlers;
306#ifdef CONFIG_JFFS2_FS_POSIX_ACL
307 sb->s_flags |= MS_POSIXACL;
308#endif
309 ret = jffs2_do_fill_super(sb, data, silent);
310 return ret;
311}
312
313static struct dentry *jffs2_mount(struct file_system_type *fs_type,
314 int flags, const char *dev_name,
315 void *data)
316{
317 return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
318}
319
320static void jffs2_put_super (struct super_block *sb)
321{
322 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
323
324 jffs2_dbg(2, "%s()\n", __func__);
325
326 mutex_lock(&c->alloc_sem);
327 jffs2_flush_wbuf_pad(c);
328 mutex_unlock(&c->alloc_sem);
329
330 jffs2_sum_exit(c);
331
332 jffs2_free_ino_caches(c);
333 jffs2_free_raw_node_refs(c);
334 kvfree(c->blocks);
335 jffs2_flash_cleanup(c);
336 kfree(c->inocache_list);
337 jffs2_clear_xattr_subsystem(c);
338 mtd_sync(c->mtd);
339 jffs2_dbg(1, "%s(): returning\n", __func__);
340}
341
342static void jffs2_kill_sb(struct super_block *sb)
343{
344 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
345 if (!(sb->s_flags & MS_RDONLY))
346 jffs2_stop_garbage_collect_thread(c);
347 kill_mtd_super(sb);
348 kfree(c);
349}
350
351static struct file_system_type jffs2_fs_type = {
352 .owner = THIS_MODULE,
353 .name = "jffs2",
354 .mount = jffs2_mount,
355 .kill_sb = jffs2_kill_sb,
356};
357MODULE_ALIAS_FS("jffs2");
358
359static int __init init_jffs2_fs(void)
360{
361 int ret;
362
363
364
365
366
367
368
369
370 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
371 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
372 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
373 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
374
375 pr_info("version 2.2."
376#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
377 " (NAND)"
378#endif
379#ifdef CONFIG_JFFS2_SUMMARY
380 " (SUMMARY) "
381#endif
382 " © 2001-2006 Red Hat, Inc.\n");
383
384 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
385 sizeof(struct jffs2_inode_info),
386 0, (SLAB_RECLAIM_ACCOUNT|
387 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
388 jffs2_i_init_once);
389 if (!jffs2_inode_cachep) {
390 pr_err("error: Failed to initialise inode cache\n");
391 return -ENOMEM;
392 }
393 ret = jffs2_compressors_init();
394 if (ret) {
395 pr_err("error: Failed to initialise compressors\n");
396 goto out;
397 }
398 ret = jffs2_create_slab_caches();
399 if (ret) {
400 pr_err("error: Failed to initialise slab caches\n");
401 goto out_compressors;
402 }
403 ret = register_filesystem(&jffs2_fs_type);
404 if (ret) {
405 pr_err("error: Failed to register filesystem\n");
406 goto out_slab;
407 }
408 return 0;
409
410 out_slab:
411 jffs2_destroy_slab_caches();
412 out_compressors:
413 jffs2_compressors_exit();
414 out:
415 kmem_cache_destroy(jffs2_inode_cachep);
416 return ret;
417}
418
419static void __exit exit_jffs2_fs(void)
420{
421 unregister_filesystem(&jffs2_fs_type);
422 jffs2_destroy_slab_caches();
423 jffs2_compressors_exit();
424
425
426
427
428
429 rcu_barrier();
430 kmem_cache_destroy(jffs2_inode_cachep);
431}
432
433module_init(init_jffs2_fs);
434module_exit(exit_jffs2_fs);
435
436MODULE_DESCRIPTION("The Journalling Flash File System, v2");
437MODULE_AUTHOR("Red Hat, Inc.");
438MODULE_LICENSE("GPL");
439
440
