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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_free_inode(struct inode *inode)
48{
49 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
50
51 kfree(f->target);
52 kmem_cache_free(jffs2_inode_cachep, f);
53}
54
55static void jffs2_i_init_once(void *foo)
56{
57 struct jffs2_inode_info *f = foo;
58
59 mutex_init(&f->sem);
60 inode_init_once(&f->vfs_inode);
61}
62
63static const char *jffs2_compr_name(unsigned int compr)
64{
65 switch (compr) {
66 case JFFS2_COMPR_MODE_NONE:
67 return "none";
68#ifdef CONFIG_JFFS2_LZO
69 case JFFS2_COMPR_MODE_FORCELZO:
70 return "lzo";
71#endif
72#ifdef CONFIG_JFFS2_ZLIB
73 case JFFS2_COMPR_MODE_FORCEZLIB:
74 return "zlib";
75#endif
76 default:
77
78 WARN_ON(1);
79 return "";
80 }
81}
82
83static int jffs2_show_options(struct seq_file *s, struct dentry *root)
84{
85 struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
86 struct jffs2_mount_opts *opts = &c->mount_opts;
87
88 if (opts->override_compr)
89 seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
90 if (opts->rp_size)
91 seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
92
93 return 0;
94}
95
96static int jffs2_sync_fs(struct super_block *sb, int wait)
97{
98 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
99
100#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
101 if (jffs2_is_writebuffered(c))
102 cancel_delayed_work_sync(&c->wbuf_dwork);
103#endif
104
105 mutex_lock(&c->alloc_sem);
106 jffs2_flush_wbuf_pad(c);
107 mutex_unlock(&c->alloc_sem);
108 return 0;
109}
110
111static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
112 uint32_t generation)
113{
114
115
116
117 return jffs2_iget(sb, ino);
118}
119
120static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
121 int fh_len, int fh_type)
122{
123 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
124 jffs2_nfs_get_inode);
125}
126
127static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
128 int fh_len, int fh_type)
129{
130 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
131 jffs2_nfs_get_inode);
132}
133
134static struct dentry *jffs2_get_parent(struct dentry *child)
135{
136 struct jffs2_inode_info *f;
137 uint32_t pino;
138
139 BUG_ON(!d_is_dir(child));
140
141 f = JFFS2_INODE_INFO(d_inode(child));
142
143 pino = f->inocache->pino_nlink;
144
145 JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
146 f->inocache->ino, pino);
147
148 return d_obtain_alias(jffs2_iget(child->d_sb, pino));
149}
150
151static const struct export_operations jffs2_export_ops = {
152 .get_parent = jffs2_get_parent,
153 .fh_to_dentry = jffs2_fh_to_dentry,
154 .fh_to_parent = jffs2_fh_to_parent,
155};
156
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162
163
164enum {
165 Opt_override_compr,
166 Opt_rp_size,
167 Opt_err,
168};
169
170static const match_table_t tokens = {
171 {Opt_override_compr, "compr=%s"},
172 {Opt_rp_size, "rp_size=%u"},
173 {Opt_err, NULL},
174};
175
176static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
177{
178 substring_t args[MAX_OPT_ARGS];
179 char *p, *name;
180 unsigned int opt;
181
182 if (!data)
183 return 0;
184
185 while ((p = strsep(&data, ","))) {
186 int token;
187
188 if (!*p)
189 continue;
190
191 token = match_token(p, tokens, args);
192 switch (token) {
193 case Opt_override_compr:
194 name = match_strdup(&args[0]);
195
196 if (!name)
197 return -ENOMEM;
198 if (!strcmp(name, "none"))
199 c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
200#ifdef CONFIG_JFFS2_LZO
201 else if (!strcmp(name, "lzo"))
202 c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
203#endif
204#ifdef CONFIG_JFFS2_ZLIB
205 else if (!strcmp(name, "zlib"))
206 c->mount_opts.compr =
207 JFFS2_COMPR_MODE_FORCEZLIB;
208#endif
209 else {
210 pr_err("Error: unknown compressor \"%s\"\n",
211 name);
212 kfree(name);
213 return -EINVAL;
214 }
215 kfree(name);
216 c->mount_opts.override_compr = true;
217 break;
218 case Opt_rp_size:
219 if (match_int(&args[0], &opt))
220 return -EINVAL;
221 opt *= 1024;
222 if (opt > c->mtd->size) {
223 pr_warn("Too large reserve pool specified, max "
224 "is %llu KB\n", c->mtd->size / 1024);
225 return -EINVAL;
226 }
227 c->mount_opts.rp_size = opt;
228 break;
229 default:
230 pr_err("Error: unrecognized mount option '%s' or missing value\n",
231 p);
232 return -EINVAL;
233 }
234 }
235
236 return 0;
237}
238
239static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data)
240{
241 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
242 int err;
243
244 sync_filesystem(sb);
245 err = jffs2_parse_options(c, data);
246 if (err)
247 return -EINVAL;
248
249 return jffs2_do_remount_fs(sb, flags, data);
250}
251
252static const struct super_operations jffs2_super_operations =
253{
254 .alloc_inode = jffs2_alloc_inode,
255 .free_inode = jffs2_free_inode,
256 .put_super = jffs2_put_super,
257 .statfs = jffs2_statfs,
258 .remount_fs = jffs2_remount_fs,
259 .evict_inode = jffs2_evict_inode,
260 .dirty_inode = jffs2_dirty_inode,
261 .show_options = jffs2_show_options,
262 .sync_fs = jffs2_sync_fs,
263};
264
265
266
267
268static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
269{
270 struct jffs2_sb_info *c;
271 int ret;
272
273 jffs2_dbg(1, "jffs2_get_sb_mtd():"
274 " New superblock for device %d (\"%s\")\n",
275 sb->s_mtd->index, sb->s_mtd->name);
276
277 c = kzalloc(sizeof(*c), GFP_KERNEL);
278 if (!c)
279 return -ENOMEM;
280
281 c->mtd = sb->s_mtd;
282 c->os_priv = sb;
283 sb->s_fs_info = c;
284
285 ret = jffs2_parse_options(c, data);
286 if (ret)
287 return -EINVAL;
288
289
290
291 mutex_init(&c->alloc_sem);
292 mutex_init(&c->erase_free_sem);
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
298 sb->s_op = &jffs2_super_operations;
299 sb->s_export_op = &jffs2_export_ops;
300 sb->s_flags = sb->s_flags | SB_NOATIME;
301 sb->s_xattr = jffs2_xattr_handlers;
302#ifdef CONFIG_JFFS2_FS_POSIX_ACL
303 sb->s_flags |= SB_POSIXACL;
304#endif
305 ret = jffs2_do_fill_super(sb, data, silent);
306 return ret;
307}
308
309static struct dentry *jffs2_mount(struct file_system_type *fs_type,
310 int flags, const char *dev_name,
311 void *data)
312{
313 return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
314}
315
316static void jffs2_put_super (struct super_block *sb)
317{
318 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
319
320 jffs2_dbg(2, "%s()\n", __func__);
321
322 mutex_lock(&c->alloc_sem);
323 jffs2_flush_wbuf_pad(c);
324 mutex_unlock(&c->alloc_sem);
325
326 jffs2_sum_exit(c);
327
328 jffs2_free_ino_caches(c);
329 jffs2_free_raw_node_refs(c);
330 kvfree(c->blocks);
331 jffs2_flash_cleanup(c);
332 kfree(c->inocache_list);
333 jffs2_clear_xattr_subsystem(c);
334 mtd_sync(c->mtd);
335 jffs2_dbg(1, "%s(): returning\n", __func__);
336}
337
338static void jffs2_kill_sb(struct super_block *sb)
339{
340 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
341 if (c && !sb_rdonly(sb))
342 jffs2_stop_garbage_collect_thread(c);
343 kill_mtd_super(sb);
344 kfree(c);
345}
346
347static struct file_system_type jffs2_fs_type = {
348 .owner = THIS_MODULE,
349 .name = "jffs2",
350 .mount = jffs2_mount,
351 .kill_sb = jffs2_kill_sb,
352};
353MODULE_ALIAS_FS("jffs2");
354
355static int __init init_jffs2_fs(void)
356{
357 int ret;
358
359
360
361
362
363
364
365
366 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
367 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
368 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
369 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
370
371 pr_info("version 2.2."
372#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
373 " (NAND)"
374#endif
375#ifdef CONFIG_JFFS2_SUMMARY
376 " (SUMMARY) "
377#endif
378 " © 2001-2006 Red Hat, Inc.\n");
379
380 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
381 sizeof(struct jffs2_inode_info),
382 0, (SLAB_RECLAIM_ACCOUNT|
383 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
384 jffs2_i_init_once);
385 if (!jffs2_inode_cachep) {
386 pr_err("error: Failed to initialise inode cache\n");
387 return -ENOMEM;
388 }
389 ret = jffs2_compressors_init();
390 if (ret) {
391 pr_err("error: Failed to initialise compressors\n");
392 goto out;
393 }
394 ret = jffs2_create_slab_caches();
395 if (ret) {
396 pr_err("error: Failed to initialise slab caches\n");
397 goto out_compressors;
398 }
399 ret = register_filesystem(&jffs2_fs_type);
400 if (ret) {
401 pr_err("error: Failed to register filesystem\n");
402 goto out_slab;
403 }
404 return 0;
405
406 out_slab:
407 jffs2_destroy_slab_caches();
408 out_compressors:
409 jffs2_compressors_exit();
410 out:
411 kmem_cache_destroy(jffs2_inode_cachep);
412 return ret;
413}
414
415static void __exit exit_jffs2_fs(void)
416{
417 unregister_filesystem(&jffs2_fs_type);
418 jffs2_destroy_slab_caches();
419 jffs2_compressors_exit();
420
421
422
423
424
425 rcu_barrier();
426 kmem_cache_destroy(jffs2_inode_cachep);
427}
428
429module_init(init_jffs2_fs);
430module_exit(exit_jffs2_fs);
431
432MODULE_DESCRIPTION("The Journalling Flash File System, v2");
433MODULE_AUTHOR("Red Hat, Inc.");
434MODULE_LICENSE("GPL");
435
436
