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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 fs_parameter_spec jffs2_param_specs[] = {
171 fsparam_enum ("compr", Opt_override_compr),
172 fsparam_u32 ("rp_size", Opt_rp_size),
173 {}
174};
175
176static const struct fs_parameter_enum jffs2_param_enums[] = {
177 { Opt_override_compr, "none", JFFS2_COMPR_MODE_NONE },
178#ifdef CONFIG_JFFS2_LZO
179 { Opt_override_compr, "lzo", JFFS2_COMPR_MODE_FORCELZO },
180#endif
181#ifdef CONFIG_JFFS2_ZLIB
182 { Opt_override_compr, "zlib", JFFS2_COMPR_MODE_FORCEZLIB },
183#endif
184 {}
185};
186
187const struct fs_parameter_description jffs2_fs_parameters = {
188 .name = "jffs2",
189 .specs = jffs2_param_specs,
190 .enums = jffs2_param_enums,
191};
192
193static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
194{
195 struct fs_parse_result result;
196 struct jffs2_sb_info *c = fc->s_fs_info;
197 int opt;
198
199 opt = fs_parse(fc, &jffs2_fs_parameters, param, &result);
200 if (opt < 0)
201 return opt;
202
203 switch (opt) {
204 case Opt_override_compr:
205 c->mount_opts.compr = result.uint_32;
206 c->mount_opts.override_compr = true;
207 break;
208 case Opt_rp_size:
209 if (result.uint_32 > UINT_MAX / 1024)
210 return invalf(fc, "jffs2: rp_size unrepresentable");
211 opt = result.uint_32 * 1024;
212 if (opt > c->mtd->size)
213 return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
214 c->mtd->size / 1024);
215 c->mount_opts.rp_size = opt;
216 break;
217 default:
218 return -EINVAL;
219 }
220
221 return 0;
222}
223
224static int jffs2_reconfigure(struct fs_context *fc)
225{
226 struct super_block *sb = fc->root->d_sb;
227
228 sync_filesystem(sb);
229 return jffs2_do_remount_fs(sb, fc);
230}
231
232static const struct super_operations jffs2_super_operations =
233{
234 .alloc_inode = jffs2_alloc_inode,
235 .free_inode = jffs2_free_inode,
236 .put_super = jffs2_put_super,
237 .statfs = jffs2_statfs,
238 .evict_inode = jffs2_evict_inode,
239 .dirty_inode = jffs2_dirty_inode,
240 .show_options = jffs2_show_options,
241 .sync_fs = jffs2_sync_fs,
242};
243
244
245
246
247static int jffs2_fill_super(struct super_block *sb, struct fs_context *fc)
248{
249 struct jffs2_sb_info *c = sb->s_fs_info;
250
251 jffs2_dbg(1, "jffs2_get_sb_mtd():"
252 " New superblock for device %d (\"%s\")\n",
253 sb->s_mtd->index, sb->s_mtd->name);
254
255 c->mtd = sb->s_mtd;
256 c->os_priv = sb;
257
258
259
260 mutex_init(&c->alloc_sem);
261 mutex_init(&c->erase_free_sem);
262 init_waitqueue_head(&c->erase_wait);
263 init_waitqueue_head(&c->inocache_wq);
264 spin_lock_init(&c->erase_completion_lock);
265 spin_lock_init(&c->inocache_lock);
266
267 sb->s_op = &jffs2_super_operations;
268 sb->s_export_op = &jffs2_export_ops;
269 sb->s_flags = sb->s_flags | SB_NOATIME;
270 sb->s_xattr = jffs2_xattr_handlers;
271#ifdef CONFIG_JFFS2_FS_POSIX_ACL
272 sb->s_flags |= SB_POSIXACL;
273#endif
274 return jffs2_do_fill_super(sb, fc);
275}
276
277static int jffs2_get_tree(struct fs_context *fc)
278{
279 return get_tree_mtd(fc, jffs2_fill_super);
280}
281
282static void jffs2_free_fc(struct fs_context *fc)
283{
284 kfree(fc->s_fs_info);
285}
286
287static const struct fs_context_operations jffs2_context_ops = {
288 .free = jffs2_free_fc,
289 .parse_param = jffs2_parse_param,
290 .get_tree = jffs2_get_tree,
291 .reconfigure = jffs2_reconfigure,
292};
293
294static int jffs2_init_fs_context(struct fs_context *fc)
295{
296 struct jffs2_sb_info *ctx;
297
298 ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL);
299 if (!ctx)
300 return -ENOMEM;
301
302 fc->s_fs_info = ctx;
303 fc->ops = &jffs2_context_ops;
304 return 0;
305}
306
307static void jffs2_put_super (struct super_block *sb)
308{
309 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
310
311 jffs2_dbg(2, "%s()\n", __func__);
312
313 mutex_lock(&c->alloc_sem);
314 jffs2_flush_wbuf_pad(c);
315 mutex_unlock(&c->alloc_sem);
316
317 jffs2_sum_exit(c);
318
319 jffs2_free_ino_caches(c);
320 jffs2_free_raw_node_refs(c);
321 kvfree(c->blocks);
322 jffs2_flash_cleanup(c);
323 kfree(c->inocache_list);
324 jffs2_clear_xattr_subsystem(c);
325 mtd_sync(c->mtd);
326 jffs2_dbg(1, "%s(): returning\n", __func__);
327}
328
329static void jffs2_kill_sb(struct super_block *sb)
330{
331 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
332 if (c && !sb_rdonly(sb))
333 jffs2_stop_garbage_collect_thread(c);
334 kill_mtd_super(sb);
335 kfree(c);
336}
337
338static struct file_system_type jffs2_fs_type = {
339 .owner = THIS_MODULE,
340 .name = "jffs2",
341 .init_fs_context = jffs2_init_fs_context,
342 .parameters = &jffs2_fs_parameters,
343 .kill_sb = jffs2_kill_sb,
344};
345MODULE_ALIAS_FS("jffs2");
346
347static int __init init_jffs2_fs(void)
348{
349 int ret;
350
351
352
353
354
355
356
357
358 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
359 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
360 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
361 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
362
363 pr_info("version 2.2."
364#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
365 " (NAND)"
366#endif
367#ifdef CONFIG_JFFS2_SUMMARY
368 " (SUMMARY) "
369#endif
370 " © 2001-2006 Red Hat, Inc.\n");
371
372 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
373 sizeof(struct jffs2_inode_info),
374 0, (SLAB_RECLAIM_ACCOUNT|
375 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
376 jffs2_i_init_once);
377 if (!jffs2_inode_cachep) {
378 pr_err("error: Failed to initialise inode cache\n");
379 return -ENOMEM;
380 }
381 ret = jffs2_compressors_init();
382 if (ret) {
383 pr_err("error: Failed to initialise compressors\n");
384 goto out;
385 }
386 ret = jffs2_create_slab_caches();
387 if (ret) {
388 pr_err("error: Failed to initialise slab caches\n");
389 goto out_compressors;
390 }
391 ret = register_filesystem(&jffs2_fs_type);
392 if (ret) {
393 pr_err("error: Failed to register filesystem\n");
394 goto out_slab;
395 }
396 return 0;
397
398 out_slab:
399 jffs2_destroy_slab_caches();
400 out_compressors:
401 jffs2_compressors_exit();
402 out:
403 kmem_cache_destroy(jffs2_inode_cachep);
404 return ret;
405}
406
407static void __exit exit_jffs2_fs(void)
408{
409 unregister_filesystem(&jffs2_fs_type);
410 jffs2_destroy_slab_caches();
411 jffs2_compressors_exit();
412
413
414
415
416
417 rcu_barrier();
418 kmem_cache_destroy(jffs2_inode_cachep);
419}
420
421module_init(init_jffs2_fs);
422module_exit(exit_jffs2_fs);
423
424MODULE_DESCRIPTION("The Journalling Flash File System, v2");
425MODULE_AUTHOR("Red Hat, Inc.");
426MODULE_LICENSE("GPL");
427
428
