1
2
3
4
5
6
7
8
9
10
11
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 mutex_lock(&c->alloc_sem);
104 jffs2_flush_wbuf_pad(c);
105 mutex_unlock(&c->alloc_sem);
106 return 0;
107}
108
109static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
110 uint32_t generation)
111{
112
113
114
115 return jffs2_iget(sb, ino);
116}
117
118static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
119 int fh_len, int fh_type)
120{
121 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
122 jffs2_nfs_get_inode);
123}
124
125static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
126 int fh_len, int fh_type)
127{
128 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
129 jffs2_nfs_get_inode);
130}
131
132static struct dentry *jffs2_get_parent(struct dentry *child)
133{
134 struct jffs2_inode_info *f;
135 uint32_t pino;
136
137 BUG_ON(!S_ISDIR(child->d_inode->i_mode));
138
139 f = JFFS2_INODE_INFO(child->d_inode);
140
141 pino = f->inocache->pino_nlink;
142
143 JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
144 f->inocache->ino, pino);
145
146 return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
147}
148
149static const struct export_operations jffs2_export_ops = {
150 .get_parent = jffs2_get_parent,
151 .fh_to_dentry = jffs2_fh_to_dentry,
152 .fh_to_parent = jffs2_fh_to_parent,
153};
154
155
156
157
158
159
160
161
162enum {
163 Opt_override_compr,
164 Opt_rp_size,
165 Opt_err,
166};
167
168static const match_table_t tokens = {
169 {Opt_override_compr, "compr=%s"},
170 {Opt_rp_size, "rp_size=%u"},
171 {Opt_err, NULL},
172};
173
174static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
175{
176 substring_t args[MAX_OPT_ARGS];
177 char *p, *name;
178 unsigned int opt;
179
180 if (!data)
181 return 0;
182
183 while ((p = strsep(&data, ","))) {
184 int token;
185
186 if (!*p)
187 continue;
188
189 token = match_token(p, tokens, args);
190 switch (token) {
191 case Opt_override_compr:
192 name = match_strdup(&args[0]);
193
194 if (!name)
195 return -ENOMEM;
196 if (!strcmp(name, "none"))
197 c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
198#ifdef CONFIG_JFFS2_LZO
199 else if (!strcmp(name, "lzo"))
200 c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
201#endif
202#ifdef CONFIG_JFFS2_ZLIB
203 else if (!strcmp(name, "zlib"))
204 c->mount_opts.compr =
205 JFFS2_COMPR_MODE_FORCEZLIB;
206#endif
207 else {
208 pr_err("Error: unknown compressor \"%s\"\n",
209 name);
210 kfree(name);
211 return -EINVAL;
212 }
213 kfree(name);
214 c->mount_opts.override_compr = true;
215 break;
216 case Opt_rp_size:
217 if (match_int(&args[0], &opt))
218 return -EINVAL;
219 opt *= 1024;
220 if (opt > c->mtd->size) {
221 pr_warn("Too large reserve pool specified, max "
222 "is %llu KB\n", c->mtd->size / 1024);
223 return -EINVAL;
224 }
225 c->mount_opts.rp_size = opt;
226 break;
227 default:
228 pr_err("Error: unrecognized mount option '%s' or missing value\n",
229 p);
230 return -EINVAL;
231 }
232 }
233
234 return 0;
235}
236
237static 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
249static const struct super_operations jffs2_super_operations =
250{
251 .alloc_inode = jffs2_alloc_inode,
252 .destroy_inode =jffs2_destroy_inode,
253 .put_super = jffs2_put_super,
254 .statfs = jffs2_statfs,
255 .remount_fs = jffs2_remount_fs,
256 .evict_inode = jffs2_evict_inode,
257 .dirty_inode = jffs2_dirty_inode,
258 .show_options = jffs2_show_options,
259 .sync_fs = jffs2_sync_fs,
260};
261
262
263
264
265static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
266{
267 struct jffs2_sb_info *c;
268 int ret;
269
270 jffs2_dbg(1, "jffs2_get_sb_mtd():"
271 " New superblock for device %d (\"%s\")\n",
272 sb->s_mtd->index, sb->s_mtd->name);
273
274 c = kzalloc(sizeof(*c), GFP_KERNEL);
275 if (!c)
276 return -ENOMEM;
277
278 c->mtd = sb->s_mtd;
279 c->os_priv = sb;
280 sb->s_fs_info = c;
281
282 ret = jffs2_parse_options(c, data);
283 if (ret) {
284 kfree(c);
285 return -EINVAL;
286 }
287
288
289
290 mutex_init(&c->alloc_sem);
291 mutex_init(&c->erase_free_sem);
292 init_waitqueue_head(&c->erase_wait);
293 init_waitqueue_head(&c->inocache_wq);
294 spin_lock_init(&c->erase_completion_lock);
295 spin_lock_init(&c->inocache_lock);
296
297 sb->s_op = &jffs2_super_operations;
298 sb->s_export_op = &jffs2_export_ops;
299 sb->s_flags = sb->s_flags | MS_NOATIME;
300 sb->s_xattr = jffs2_xattr_handlers;
301#ifdef CONFIG_JFFS2_FS_POSIX_ACL
302 sb->s_flags |= MS_POSIXACL;
303#endif
304 ret = jffs2_do_fill_super(sb, data, silent);
305 return ret;
306}
307
308static struct dentry *jffs2_mount(struct file_system_type *fs_type,
309 int flags, const char *dev_name,
310 void *data)
311{
312 return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
313}
314
315static void jffs2_put_super (struct super_block *sb)
316{
317 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
318
319 jffs2_dbg(2, "%s()\n", __func__);
320
321 mutex_lock(&c->alloc_sem);
322 jffs2_flush_wbuf_pad(c);
323 mutex_unlock(&c->alloc_sem);
324
325 jffs2_sum_exit(c);
326
327 jffs2_free_ino_caches(c);
328 jffs2_free_raw_node_refs(c);
329 if (jffs2_blocks_use_vmalloc(c))
330 vfree(c->blocks);
331 else
332 kfree(c->blocks);
333 jffs2_flash_cleanup(c);
334 kfree(c->inocache_list);
335 jffs2_clear_xattr_subsystem(c);
336 mtd_sync(c->mtd);
337 jffs2_dbg(1, "%s(): returning\n", __func__);
338}
339
340static void jffs2_kill_sb(struct super_block *sb)
341{
342 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
343 if (!(sb->s_flags & MS_RDONLY))
344 jffs2_stop_garbage_collect_thread(c);
345 kill_mtd_super(sb);
346 kfree(c);
347}
348
349static struct file_system_type jffs2_fs_type = {
350 .owner = THIS_MODULE,
351 .name = "jffs2",
352 .mount = jffs2_mount,
353 .kill_sb = jffs2_kill_sb,
354};
355
356static int __init init_jffs2_fs(void)
357{
358 int ret;
359
360
361
362
363
364
365
366
367 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
368 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
369 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
370 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
371
372 pr_info("version 2.2."
373#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
374 " (NAND)"
375#endif
376#ifdef CONFIG_JFFS2_SUMMARY
377 " (SUMMARY) "
378#endif
379 " © 2001-2006 Red Hat, Inc.\n");
380
381 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
382 sizeof(struct jffs2_inode_info),
383 0, (SLAB_RECLAIM_ACCOUNT|
384 SLAB_MEM_SPREAD),
385 jffs2_i_init_once);
386 if (!jffs2_inode_cachep) {
387 pr_err("error: Failed to initialise inode cache\n");
388 return -ENOMEM;
389 }
390 ret = jffs2_compressors_init();
391 if (ret) {
392 pr_err("error: Failed to initialise compressors\n");
393 goto out;
394 }
395 ret = jffs2_create_slab_caches();
396 if (ret) {
397 pr_err("error: Failed to initialise slab caches\n");
398 goto out_compressors;
399 }
400 ret = register_filesystem(&jffs2_fs_type);
401 if (ret) {
402 pr_err("error: Failed to register filesystem\n");
403 goto out_slab;
404 }
405 return 0;
406
407 out_slab:
408 jffs2_destroy_slab_caches();
409 out_compressors:
410 jffs2_compressors_exit();
411 out:
412 kmem_cache_destroy(jffs2_inode_cachep);
413 return ret;
414}
415
416static void __exit exit_jffs2_fs(void)
417{
418 unregister_filesystem(&jffs2_fs_type);
419 jffs2_destroy_slab_caches();
420 jffs2_compressors_exit();
421 kmem_cache_destroy(jffs2_inode_cachep);
422}
423
424module_init(init_jffs2_fs);
425module_exit(exit_jffs2_fs);
426
427MODULE_DESCRIPTION("The Journalling Flash File System, v2");
428MODULE_AUTHOR("Red Hat, Inc.");
429MODULE_LICENSE("GPL");
430
431
