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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/fs_context.h>
23#include <linux/fs_parser.h>
24#include <linux/jffs2.h>
25#include <linux/pagemap.h>
26#include <linux/mtd/super.h>
27#include <linux/ctype.h>
28#include <linux/namei.h>
29#include <linux/seq_file.h>
30#include <linux/exportfs.h>
31#include "compr.h"
32#include "nodelist.h"
33
34static void jffs2_put_super(struct super_block *);
35
36static struct kmem_cache *jffs2_inode_cachep;
37
38static struct inode *jffs2_alloc_inode(struct super_block *sb)
39{
40 struct jffs2_inode_info *f;
41
42 f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
43 if (!f)
44 return NULL;
45 return &f->vfs_inode;
46}
47
48static void jffs2_free_inode(struct inode *inode)
49{
50 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
51
52 kfree(f->target);
53 kmem_cache_free(jffs2_inode_cachep, f);
54}
55
56static void jffs2_i_init_once(void *foo)
57{
58 struct jffs2_inode_info *f = foo;
59
60 mutex_init(&f->sem);
61 inode_init_once(&f->vfs_inode);
62}
63
64static const char *jffs2_compr_name(unsigned int compr)
65{
66 switch (compr) {
67 case JFFS2_COMPR_MODE_NONE:
68 return "none";
69#ifdef CONFIG_JFFS2_LZO
70 case JFFS2_COMPR_MODE_FORCELZO:
71 return "lzo";
72#endif
73#ifdef CONFIG_JFFS2_ZLIB
74 case JFFS2_COMPR_MODE_FORCEZLIB:
75 return "zlib";
76#endif
77 default:
78
79 WARN_ON(1);
80 return "";
81 }
82}
83
84static int jffs2_show_options(struct seq_file *s, struct dentry *root)
85{
86 struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
87 struct jffs2_mount_opts *opts = &c->mount_opts;
88
89 if (opts->override_compr)
90 seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
91 if (opts->rp_size)
92 seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
93
94 return 0;
95}
96
97static int jffs2_sync_fs(struct super_block *sb, int wait)
98{
99 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
100
101#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
102 if (jffs2_is_writebuffered(c))
103 cancel_delayed_work_sync(&c->wbuf_dwork);
104#endif
105
106 mutex_lock(&c->alloc_sem);
107 jffs2_flush_wbuf_pad(c);
108 mutex_unlock(&c->alloc_sem);
109 return 0;
110}
111
112static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
113 uint32_t generation)
114{
115
116
117
118 return jffs2_iget(sb, ino);
119}
120
121static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
122 int fh_len, int fh_type)
123{
124 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
125 jffs2_nfs_get_inode);
126}
127
128static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
129 int fh_len, int fh_type)
130{
131 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
132 jffs2_nfs_get_inode);
133}
134
135static struct dentry *jffs2_get_parent(struct dentry *child)
136{
137 struct jffs2_inode_info *f;
138 uint32_t pino;
139
140 BUG_ON(!d_is_dir(child));
141
142 f = JFFS2_INODE_INFO(d_inode(child));
143
144 pino = f->inocache->pino_nlink;
145
146 JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
147 f->inocache->ino, pino);
148
149 return d_obtain_alias(jffs2_iget(child->d_sb, pino));
150}
151
152static const struct export_operations jffs2_export_ops = {
153 .get_parent = jffs2_get_parent,
154 .fh_to_dentry = jffs2_fh_to_dentry,
155 .fh_to_parent = jffs2_fh_to_parent,
156};
157
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161
162
163
164
165enum {
166 Opt_override_compr,
167 Opt_rp_size,
168};
169
170static const struct constant_table jffs2_param_compr[] = {
171 {"none", JFFS2_COMPR_MODE_NONE },
172#ifdef CONFIG_JFFS2_LZO
173 {"lzo", JFFS2_COMPR_MODE_FORCELZO },
174#endif
175#ifdef CONFIG_JFFS2_ZLIB
176 {"zlib", JFFS2_COMPR_MODE_FORCEZLIB },
177#endif
178 {}
179};
180
181static const struct fs_parameter_spec jffs2_fs_parameters[] = {
182 fsparam_enum ("compr", Opt_override_compr, jffs2_param_compr),
183 fsparam_u32 ("rp_size", Opt_rp_size),
184 {}
185};
186
187static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
188{
189 struct fs_parse_result result;
190 struct jffs2_sb_info *c = fc->s_fs_info;
191 int opt;
192
193 opt = fs_parse(fc, jffs2_fs_parameters, param, &result);
194 if (opt < 0)
195 return opt;
196
197 switch (opt) {
198 case Opt_override_compr:
199 c->mount_opts.compr = result.uint_32;
200 c->mount_opts.override_compr = true;
201 break;
202 case Opt_rp_size:
203 if (result.uint_32 > UINT_MAX / 1024)
204 return invalf(fc, "jffs2: rp_size unrepresentable");
205 opt = result.uint_32 * 1024;
206 if (opt > c->mtd->size)
207 return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
208 c->mtd->size / 1024);
209 c->mount_opts.rp_size = opt;
210 break;
211 default:
212 return -EINVAL;
213 }
214
215 return 0;
216}
217
218static int jffs2_reconfigure(struct fs_context *fc)
219{
220 struct super_block *sb = fc->root->d_sb;
221
222 sync_filesystem(sb);
223 return jffs2_do_remount_fs(sb, fc);
224}
225
226static const struct super_operations jffs2_super_operations =
227{
228 .alloc_inode = jffs2_alloc_inode,
229 .free_inode = jffs2_free_inode,
230 .put_super = jffs2_put_super,
231 .statfs = jffs2_statfs,
232 .evict_inode = jffs2_evict_inode,
233 .dirty_inode = jffs2_dirty_inode,
234 .show_options = jffs2_show_options,
235 .sync_fs = jffs2_sync_fs,
236};
237
238
239
240
241static int jffs2_fill_super(struct super_block *sb, struct fs_context *fc)
242{
243 struct jffs2_sb_info *c = sb->s_fs_info;
244
245 jffs2_dbg(1, "jffs2_get_sb_mtd():"
246 " New superblock for device %d (\"%s\")\n",
247 sb->s_mtd->index, sb->s_mtd->name);
248
249 c->mtd = sb->s_mtd;
250 c->os_priv = sb;
251
252
253
254 mutex_init(&c->alloc_sem);
255 mutex_init(&c->erase_free_sem);
256 init_waitqueue_head(&c->erase_wait);
257 init_waitqueue_head(&c->inocache_wq);
258 spin_lock_init(&c->erase_completion_lock);
259 spin_lock_init(&c->inocache_lock);
260
261 sb->s_op = &jffs2_super_operations;
262 sb->s_export_op = &jffs2_export_ops;
263 sb->s_flags = sb->s_flags | SB_NOATIME;
264 sb->s_xattr = jffs2_xattr_handlers;
265#ifdef CONFIG_JFFS2_FS_POSIX_ACL
266 sb->s_flags |= SB_POSIXACL;
267#endif
268 return jffs2_do_fill_super(sb, fc);
269}
270
271static int jffs2_get_tree(struct fs_context *fc)
272{
273 return get_tree_mtd(fc, jffs2_fill_super);
274}
275
276static void jffs2_free_fc(struct fs_context *fc)
277{
278 kfree(fc->s_fs_info);
279}
280
281static const struct fs_context_operations jffs2_context_ops = {
282 .free = jffs2_free_fc,
283 .parse_param = jffs2_parse_param,
284 .get_tree = jffs2_get_tree,
285 .reconfigure = jffs2_reconfigure,
286};
287
288static int jffs2_init_fs_context(struct fs_context *fc)
289{
290 struct jffs2_sb_info *ctx;
291
292 ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL);
293 if (!ctx)
294 return -ENOMEM;
295
296 fc->s_fs_info = ctx;
297 fc->ops = &jffs2_context_ops;
298 return 0;
299}
300
301static void jffs2_put_super (struct super_block *sb)
302{
303 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
304
305 jffs2_dbg(2, "%s()\n", __func__);
306
307 mutex_lock(&c->alloc_sem);
308 jffs2_flush_wbuf_pad(c);
309 mutex_unlock(&c->alloc_sem);
310
311 jffs2_sum_exit(c);
312
313 jffs2_free_ino_caches(c);
314 jffs2_free_raw_node_refs(c);
315 kvfree(c->blocks);
316 jffs2_flash_cleanup(c);
317 kfree(c->inocache_list);
318 jffs2_clear_xattr_subsystem(c);
319 mtd_sync(c->mtd);
320 jffs2_dbg(1, "%s(): returning\n", __func__);
321}
322
323static void jffs2_kill_sb(struct super_block *sb)
324{
325 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
326 if (c && !sb_rdonly(sb))
327 jffs2_stop_garbage_collect_thread(c);
328 kill_mtd_super(sb);
329 kfree(c);
330}
331
332static struct file_system_type jffs2_fs_type = {
333 .owner = THIS_MODULE,
334 .name = "jffs2",
335 .init_fs_context = jffs2_init_fs_context,
336 .parameters = jffs2_fs_parameters,
337 .kill_sb = jffs2_kill_sb,
338};
339MODULE_ALIAS_FS("jffs2");
340
341static int __init init_jffs2_fs(void)
342{
343 int ret;
344
345
346
347
348
349
350
351
352 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
353 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
354 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
355 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
356
357 pr_info("version 2.2."
358#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
359 " (NAND)"
360#endif
361#ifdef CONFIG_JFFS2_SUMMARY
362 " (SUMMARY) "
363#endif
364 " © 2001-2006 Red Hat, Inc.\n");
365
366 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
367 sizeof(struct jffs2_inode_info),
368 0, (SLAB_RECLAIM_ACCOUNT|
369 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
370 jffs2_i_init_once);
371 if (!jffs2_inode_cachep) {
372 pr_err("error: Failed to initialise inode cache\n");
373 return -ENOMEM;
374 }
375 ret = jffs2_compressors_init();
376 if (ret) {
377 pr_err("error: Failed to initialise compressors\n");
378 goto out;
379 }
380 ret = jffs2_create_slab_caches();
381 if (ret) {
382 pr_err("error: Failed to initialise slab caches\n");
383 goto out_compressors;
384 }
385 ret = register_filesystem(&jffs2_fs_type);
386 if (ret) {
387 pr_err("error: Failed to register filesystem\n");
388 goto out_slab;
389 }
390 return 0;
391
392 out_slab:
393 jffs2_destroy_slab_caches();
394 out_compressors:
395 jffs2_compressors_exit();
396 out:
397 kmem_cache_destroy(jffs2_inode_cachep);
398 return ret;
399}
400
401static void __exit exit_jffs2_fs(void)
402{
403 unregister_filesystem(&jffs2_fs_type);
404 jffs2_destroy_slab_caches();
405 jffs2_compressors_exit();
406
407
408
409
410
411 rcu_barrier();
412 kmem_cache_destroy(jffs2_inode_cachep);
413}
414
415module_init(init_jffs2_fs);
416module_exit(exit_jffs2_fs);
417
418MODULE_DESCRIPTION("The Journalling Flash File System, v2");
419MODULE_AUTHOR("Red Hat, Inc.");
420MODULE_LICENSE("GPL");
421
422
