mtd: do not use mtd->block_markbad directly
[linux-2.6.git] / fs / jffs2 / super.c
1 /*
2  * JFFS2 -- Journalling Flash File System, Version 2.
3  *
4  * Copyright © 2001-2007 Red Hat, Inc.
5  *
6  * Created by David Woodhouse <dwmw2@infradead.org>
7  *
8  * For licensing information, see the file 'LICENCE' in this directory.
9  *
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/list.h>
17 #include <linux/fs.h>
18 #include <linux/err.h>
19 #include <linux/mount.h>
20 #include <linux/parser.h>
21 #include <linux/jffs2.h>
22 #include <linux/pagemap.h>
23 #include <linux/mtd/super.h>
24 #include <linux/ctype.h>
25 #include <linux/namei.h>
26 #include <linux/seq_file.h>
27 #include <linux/exportfs.h>
28 #include "compr.h"
29 #include "nodelist.h"
30
31 static void jffs2_put_super(struct super_block *);
32
33 static struct kmem_cache *jffs2_inode_cachep;
34
35 static struct inode *jffs2_alloc_inode(struct super_block *sb)
36 {
37         struct jffs2_inode_info *f;
38
39         f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
40         if (!f)
41                 return NULL;
42         return &f->vfs_inode;
43 }
44
45 static void jffs2_i_callback(struct rcu_head *head)
46 {
47         struct inode *inode = container_of(head, struct inode, i_rcu);
48         INIT_LIST_HEAD(&inode->i_dentry);
49         kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
50 }
51
52 static void jffs2_destroy_inode(struct inode *inode)
53 {
54         call_rcu(&inode->i_rcu, jffs2_i_callback);
55 }
56
57 static void jffs2_i_init_once(void *foo)
58 {
59         struct jffs2_inode_info *f = foo;
60
61         mutex_init(&f->sem);
62         inode_init_once(&f->vfs_inode);
63 }
64
65 static void jffs2_write_super(struct super_block *sb)
66 {
67         struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
68
69         lock_super(sb);
70         sb->s_dirt = 0;
71
72         if (!(sb->s_flags & MS_RDONLY)) {
73                 D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
74                 jffs2_flush_wbuf_gc(c, 0);
75         }
76
77         unlock_super(sb);
78 }
79
80 static const char *jffs2_compr_name(unsigned int compr)
81 {
82         switch (compr) {
83         case JFFS2_COMPR_MODE_NONE:
84                 return "none";
85 #ifdef CONFIG_JFFS2_LZO
86         case JFFS2_COMPR_MODE_FORCELZO:
87                 return "lzo";
88 #endif
89 #ifdef CONFIG_JFFS2_ZLIB
90         case JFFS2_COMPR_MODE_FORCEZLIB:
91                 return "zlib";
92 #endif
93         default:
94                 /* should never happen; programmer error */
95                 WARN_ON(1);
96                 return "";
97         }
98 }
99
100 static int jffs2_show_options(struct seq_file *s, struct vfsmount *mnt)
101 {
102         struct jffs2_sb_info *c = JFFS2_SB_INFO(mnt->mnt_sb);
103         struct jffs2_mount_opts *opts = &c->mount_opts;
104
105         if (opts->override_compr)
106                 seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
107
108         return 0;
109 }
110
111 static int jffs2_sync_fs(struct super_block *sb, int wait)
112 {
113         struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
114
115         jffs2_write_super(sb);
116
117         mutex_lock(&c->alloc_sem);
118         jffs2_flush_wbuf_pad(c);
119         mutex_unlock(&c->alloc_sem);
120         return 0;
121 }
122
123 static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
124                                          uint32_t generation)
125 {
126         /* We don't care about i_generation. We'll destroy the flash
127            before we start re-using inode numbers anyway. And even
128            if that wasn't true, we'd have other problems...*/
129         return jffs2_iget(sb, ino);
130 }
131
132 static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
133                                          int fh_len, int fh_type)
134 {
135         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
136                                     jffs2_nfs_get_inode);
137 }
138
139 static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
140                                          int fh_len, int fh_type)
141 {
142         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
143                                     jffs2_nfs_get_inode);
144 }
145
146 static struct dentry *jffs2_get_parent(struct dentry *child)
147 {
148         struct jffs2_inode_info *f;
149         uint32_t pino;
150
151         BUG_ON(!S_ISDIR(child->d_inode->i_mode));
152
153         f = JFFS2_INODE_INFO(child->d_inode);
154
155         pino = f->inocache->pino_nlink;
156
157         JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
158                     f->inocache->ino, pino);
159
160         return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
161 }
162
163 static const struct export_operations jffs2_export_ops = {
164         .get_parent = jffs2_get_parent,
165         .fh_to_dentry = jffs2_fh_to_dentry,
166         .fh_to_parent = jffs2_fh_to_parent,
167 };
168
169 /*
170  * JFFS2 mount options.
171  *
172  * Opt_override_compr: override default compressor
173  * Opt_err: just end of array marker
174  */
175 enum {
176         Opt_override_compr,
177         Opt_err,
178 };
179
180 static const match_table_t tokens = {
181         {Opt_override_compr, "compr=%s"},
182         {Opt_err, NULL},
183 };
184
185 static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
186 {
187         substring_t args[MAX_OPT_ARGS];
188         char *p, *name;
189
190         if (!data)
191                 return 0;
192
193         while ((p = strsep(&data, ","))) {
194                 int token;
195
196                 if (!*p)
197                         continue;
198
199                 token = match_token(p, tokens, args);
200                 switch (token) {
201                 case Opt_override_compr:
202                         name = match_strdup(&args[0]);
203
204                         if (!name)
205                                 return -ENOMEM;
206                         if (!strcmp(name, "none"))
207                                 c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
208 #ifdef CONFIG_JFFS2_LZO
209                         else if (!strcmp(name, "lzo"))
210                                 c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
211 #endif
212 #ifdef CONFIG_JFFS2_ZLIB
213                         else if (!strcmp(name, "zlib"))
214                                 c->mount_opts.compr =
215                                                 JFFS2_COMPR_MODE_FORCEZLIB;
216 #endif
217                         else {
218                                 printk(KERN_ERR "JFFS2 Error: unknown compressor \"%s\"",
219                                                 name);
220                                 kfree(name);
221                                 return -EINVAL;
222                         }
223                         kfree(name);
224                         c->mount_opts.override_compr = true;
225                         break;
226                 default:
227                         printk(KERN_ERR "JFFS2 Error: unrecognized mount option '%s' or missing value\n",
228                                         p);
229                         return -EINVAL;
230                 }
231         }
232
233         return 0;
234 }
235
236 static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data)
237 {
238         struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
239         int err;
240
241         err = jffs2_parse_options(c, data);
242         if (err)
243                 return -EINVAL;
244
245         return jffs2_do_remount_fs(sb, flags, data);
246 }
247
248 static const struct super_operations jffs2_super_operations =
249 {
250         .alloc_inode =  jffs2_alloc_inode,
251         .destroy_inode =jffs2_destroy_inode,
252         .put_super =    jffs2_put_super,
253         .write_super =  jffs2_write_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  * fill in the superblock
264  */
265 static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
266 {
267         struct jffs2_sb_info *c;
268         int ret;
269
270         D1(printk(KERN_DEBUG "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         /* Initialize JFFS2 superblock locks, the further initialization will
289          * be done later */
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
308 static 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
315 static void jffs2_put_super (struct super_block *sb)
316 {
317         struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
318
319         D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
320
321         if (sb->s_dirt)
322                 jffs2_write_super(sb);
323
324         mutex_lock(&c->alloc_sem);
325         jffs2_flush_wbuf_pad(c);
326         mutex_unlock(&c->alloc_sem);
327
328         jffs2_sum_exit(c);
329
330         jffs2_free_ino_caches(c);
331         jffs2_free_raw_node_refs(c);
332         if (jffs2_blocks_use_vmalloc(c))
333                 vfree(c->blocks);
334         else
335                 kfree(c->blocks);
336         jffs2_flash_cleanup(c);
337         kfree(c->inocache_list);
338         jffs2_clear_xattr_subsystem(c);
339         mtd_sync(c->mtd);
340         D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
341 }
342
343 static void jffs2_kill_sb(struct super_block *sb)
344 {
345         struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
346         if (!(sb->s_flags & MS_RDONLY))
347                 jffs2_stop_garbage_collect_thread(c);
348         kill_mtd_super(sb);
349         kfree(c);
350 }
351
352 static struct file_system_type jffs2_fs_type = {
353         .owner =        THIS_MODULE,
354         .name =         "jffs2",
355         .mount =        jffs2_mount,
356         .kill_sb =      jffs2_kill_sb,
357 };
358
359 static int __init init_jffs2_fs(void)
360 {
361         int ret;
362
363         /* Paranoia checks for on-medium structures. If we ask GCC
364            to pack them with __attribute__((packed)) then it _also_
365            assumes that they're not aligned -- so it emits crappy
366            code on some architectures. Ideally we want an attribute
367            which means just 'no padding', without the alignment
368            thing. But GCC doesn't have that -- we have to just
369            hope the structs are the right sizes, instead. */
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         printk(KERN_INFO "JFFS2 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),
388                                              jffs2_i_init_once);
389         if (!jffs2_inode_cachep) {
390                 printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
391                 return -ENOMEM;
392         }
393         ret = jffs2_compressors_init();
394         if (ret) {
395                 printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
396                 goto out;
397         }
398         ret = jffs2_create_slab_caches();
399         if (ret) {
400                 printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
401                 goto out_compressors;
402         }
403         ret = register_filesystem(&jffs2_fs_type);
404         if (ret) {
405                 printk(KERN_ERR "JFFS2 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
419 static void __exit exit_jffs2_fs(void)
420 {
421         unregister_filesystem(&jffs2_fs_type);
422         jffs2_destroy_slab_caches();
423         jffs2_compressors_exit();
424         kmem_cache_destroy(jffs2_inode_cachep);
425 }
426
427 module_init(init_jffs2_fs);
428 module_exit(exit_jffs2_fs);
429
430 MODULE_DESCRIPTION("The Journalling Flash File System, v2");
431 MODULE_AUTHOR("Red Hat, Inc.");
432 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
433                        // the sake of this tag. It's Free Software.