2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
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>
33 static void jffs2_put_super(struct super_block
*);
35 static struct kmem_cache
*jffs2_inode_cachep
;
37 static struct inode
*jffs2_alloc_inode(struct super_block
*sb
)
39 struct jffs2_inode_info
*f
;
41 f
= kmem_cache_alloc(jffs2_inode_cachep
, GFP_KERNEL
);
47 static void jffs2_i_callback(struct rcu_head
*head
)
49 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
50 kmem_cache_free(jffs2_inode_cachep
, JFFS2_INODE_INFO(inode
));
53 static void jffs2_destroy_inode(struct inode
*inode
)
55 call_rcu(&inode
->i_rcu
, jffs2_i_callback
);
58 static void jffs2_i_init_once(void *foo
)
60 struct jffs2_inode_info
*f
= foo
;
63 inode_init_once(&f
->vfs_inode
);
66 static const char *jffs2_compr_name(unsigned int compr
)
69 case JFFS2_COMPR_MODE_NONE
:
71 #ifdef CONFIG_JFFS2_LZO
72 case JFFS2_COMPR_MODE_FORCELZO
:
75 #ifdef CONFIG_JFFS2_ZLIB
76 case JFFS2_COMPR_MODE_FORCEZLIB
:
80 /* should never happen; programmer error */
86 static int jffs2_show_options(struct seq_file
*s
, struct dentry
*root
)
88 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(root
->d_sb
);
89 struct jffs2_mount_opts
*opts
= &c
->mount_opts
;
91 if (opts
->override_compr
)
92 seq_printf(s
, ",compr=%s", jffs2_compr_name(opts
->compr
));
94 seq_printf(s
, ",rp_size=%u", opts
->rp_size
/ 1024);
99 static int jffs2_sync_fs(struct super_block
*sb
, int wait
)
101 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
103 mutex_lock(&c
->alloc_sem
);
104 jffs2_flush_wbuf_pad(c
);
105 mutex_unlock(&c
->alloc_sem
);
109 static struct inode
*jffs2_nfs_get_inode(struct super_block
*sb
, uint64_t ino
,
112 /* We don't care about i_generation. We'll destroy the flash
113 before we start re-using inode numbers anyway. And even
114 if that wasn't true, we'd have other problems...*/
115 return jffs2_iget(sb
, ino
);
118 static struct dentry
*jffs2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
119 int fh_len
, int fh_type
)
121 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
122 jffs2_nfs_get_inode
);
125 static struct dentry
*jffs2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
126 int fh_len
, int fh_type
)
128 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
129 jffs2_nfs_get_inode
);
132 static struct dentry
*jffs2_get_parent(struct dentry
*child
)
134 struct jffs2_inode_info
*f
;
137 BUG_ON(!S_ISDIR(child
->d_inode
->i_mode
));
139 f
= JFFS2_INODE_INFO(child
->d_inode
);
141 pino
= f
->inocache
->pino_nlink
;
143 JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
144 f
->inocache
->ino
, pino
);
146 return d_obtain_alias(jffs2_iget(child
->d_inode
->i_sb
, pino
));
149 static 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
,
156 * JFFS2 mount options.
158 * Opt_override_compr: override default compressor
159 * Opt_rp_size: size of reserved pool in KiB
160 * Opt_err: just end of array marker
168 static const match_table_t tokens
= {
169 {Opt_override_compr
, "compr=%s"},
170 {Opt_rp_size
, "rp_size=%u"},
174 static int jffs2_parse_options(struct jffs2_sb_info
*c
, char *data
)
176 substring_t args
[MAX_OPT_ARGS
];
183 while ((p
= strsep(&data
, ","))) {
189 token
= match_token(p
, tokens
, args
);
191 case Opt_override_compr
:
192 name
= match_strdup(&args
[0]);
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
;
202 #ifdef CONFIG_JFFS2_ZLIB
203 else if (!strcmp(name
, "zlib"))
204 c
->mount_opts
.compr
=
205 JFFS2_COMPR_MODE_FORCEZLIB
;
208 pr_err("Error: unknown compressor \"%s\"\n",
214 c
->mount_opts
.override_compr
= true;
217 if (match_int(&args
[0], &opt
))
220 if (opt
> c
->mtd
->size
) {
221 pr_warn("Too large reserve pool specified, max "
222 "is %llu KB\n", c
->mtd
->size
/ 1024);
225 c
->mount_opts
.rp_size
= opt
;
228 pr_err("Error: unrecognized mount option '%s' or missing value\n",
237 static int jffs2_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
239 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
242 err
= jffs2_parse_options(c
, data
);
246 return jffs2_do_remount_fs(sb
, flags
, data
);
249 static const struct super_operations jffs2_super_operations
=
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
,
263 * fill in the superblock
265 static int jffs2_fill_super(struct super_block
*sb
, void *data
, int silent
)
267 struct jffs2_sb_info
*c
;
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
);
274 c
= kzalloc(sizeof(*c
), GFP_KERNEL
);
282 ret
= jffs2_parse_options(c
, data
);
288 /* Initialize JFFS2 superblock locks, the further initialization will
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
);
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
;
304 ret
= jffs2_do_fill_super(sb
, data
, silent
);
308 static struct dentry
*jffs2_mount(struct file_system_type
*fs_type
,
309 int flags
, const char *dev_name
,
312 return mount_mtd(fs_type
, flags
, dev_name
, data
, jffs2_fill_super
);
315 static void jffs2_put_super (struct super_block
*sb
)
317 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
319 jffs2_dbg(2, "%s()\n", __func__
);
321 mutex_lock(&c
->alloc_sem
);
322 jffs2_flush_wbuf_pad(c
);
323 mutex_unlock(&c
->alloc_sem
);
327 jffs2_free_ino_caches(c
);
328 jffs2_free_raw_node_refs(c
);
329 if (jffs2_blocks_use_vmalloc(c
))
333 jffs2_flash_cleanup(c
);
334 kfree(c
->inocache_list
);
335 jffs2_clear_xattr_subsystem(c
);
337 jffs2_dbg(1, "%s(): returning\n", __func__
);
340 static void jffs2_kill_sb(struct super_block
*sb
)
342 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
343 if (!(sb
->s_flags
& MS_RDONLY
))
344 jffs2_stop_garbage_collect_thread(c
);
349 static struct file_system_type jffs2_fs_type
= {
350 .owner
= THIS_MODULE
,
352 .mount
= jffs2_mount
,
353 .kill_sb
= jffs2_kill_sb
,
356 static int __init
init_jffs2_fs(void)
360 /* Paranoia checks for on-medium structures. If we ask GCC
361 to pack them with __attribute__((packed)) then it _also_
362 assumes that they're not aligned -- so it emits crappy
363 code on some architectures. Ideally we want an attribute
364 which means just 'no padding', without the alignment
365 thing. But GCC doesn't have that -- we have to just
366 hope the structs are the right sizes, instead. */
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);
372 pr_info("version 2.2."
373 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
376 #ifdef CONFIG_JFFS2_SUMMARY
379 " © 2001-2006 Red Hat, Inc.\n");
381 jffs2_inode_cachep
= kmem_cache_create("jffs2_i",
382 sizeof(struct jffs2_inode_info
),
383 0, (SLAB_RECLAIM_ACCOUNT
|
386 if (!jffs2_inode_cachep
) {
387 pr_err("error: Failed to initialise inode cache\n");
390 ret
= jffs2_compressors_init();
392 pr_err("error: Failed to initialise compressors\n");
395 ret
= jffs2_create_slab_caches();
397 pr_err("error: Failed to initialise slab caches\n");
398 goto out_compressors
;
400 ret
= register_filesystem(&jffs2_fs_type
);
402 pr_err("error: Failed to register filesystem\n");
408 jffs2_destroy_slab_caches();
410 jffs2_compressors_exit();
412 kmem_cache_destroy(jffs2_inode_cachep
);
416 static void __exit
exit_jffs2_fs(void)
418 unregister_filesystem(&jffs2_fs_type
);
419 jffs2_destroy_slab_caches();
420 jffs2_compressors_exit();
423 * Make sure all delayed rcu free inodes are flushed before we
427 kmem_cache_destroy(jffs2_inode_cachep
);
430 module_init(init_jffs2_fs
);
431 module_exit(exit_jffs2_fs
);
433 MODULE_DESCRIPTION("The Journalling Flash File System, v2");
434 MODULE_AUTHOR("Red Hat, Inc.");
435 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
436 // the sake of this tag. It's Free Software.