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 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/smp_lock.h>
16 #include <linux/init.h>
17 #include <linux/list.h>
19 #include <linux/err.h>
20 #include <linux/mount.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/exportfs.h>
30 static void jffs2_put_super(struct super_block
*);
32 static struct kmem_cache
*jffs2_inode_cachep
;
34 static struct inode
*jffs2_alloc_inode(struct super_block
*sb
)
36 struct jffs2_inode_info
*f
;
38 f
= kmem_cache_alloc(jffs2_inode_cachep
, GFP_KERNEL
);
44 static void jffs2_destroy_inode(struct inode
*inode
)
46 kmem_cache_free(jffs2_inode_cachep
, JFFS2_INODE_INFO(inode
));
49 static void jffs2_i_init_once(void *foo
)
51 struct jffs2_inode_info
*f
= foo
;
54 inode_init_once(&f
->vfs_inode
);
57 static void jffs2_write_super(struct super_block
*sb
)
59 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
64 if (!(sb
->s_flags
& MS_RDONLY
)) {
65 D1(printk(KERN_DEBUG
"jffs2_write_super()\n"));
66 jffs2_flush_wbuf_gc(c
, 0);
72 static int jffs2_sync_fs(struct super_block
*sb
, int wait
)
74 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
76 jffs2_write_super(sb
);
78 mutex_lock(&c
->alloc_sem
);
79 jffs2_flush_wbuf_pad(c
);
80 mutex_unlock(&c
->alloc_sem
);
84 static struct inode
*jffs2_nfs_get_inode(struct super_block
*sb
, uint64_t ino
,
87 /* We don't care about i_generation. We'll destroy the flash
88 before we start re-using inode numbers anyway. And even
89 if that wasn't true, we'd have other problems...*/
90 return jffs2_iget(sb
, ino
);
93 static struct dentry
*jffs2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
94 int fh_len
, int fh_type
)
96 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
100 static struct dentry
*jffs2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
101 int fh_len
, int fh_type
)
103 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
104 jffs2_nfs_get_inode
);
107 static struct dentry
*jffs2_get_parent(struct dentry
*child
)
109 struct jffs2_inode_info
*f
;
112 BUG_ON(!S_ISDIR(child
->d_inode
->i_mode
));
114 f
= JFFS2_INODE_INFO(child
->d_inode
);
116 pino
= f
->inocache
->pino_nlink
;
118 JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
119 f
->inocache
->ino
, pino
);
121 return d_obtain_alias(jffs2_iget(child
->d_inode
->i_sb
, pino
));
124 static const struct export_operations jffs2_export_ops
= {
125 .get_parent
= jffs2_get_parent
,
126 .fh_to_dentry
= jffs2_fh_to_dentry
,
127 .fh_to_parent
= jffs2_fh_to_parent
,
130 static const struct super_operations jffs2_super_operations
=
132 .alloc_inode
= jffs2_alloc_inode
,
133 .destroy_inode
=jffs2_destroy_inode
,
134 .put_super
= jffs2_put_super
,
135 .write_super
= jffs2_write_super
,
136 .statfs
= jffs2_statfs
,
137 .remount_fs
= jffs2_remount_fs
,
138 .evict_inode
= jffs2_evict_inode
,
139 .dirty_inode
= jffs2_dirty_inode
,
140 .sync_fs
= jffs2_sync_fs
,
144 * fill in the superblock
146 static int jffs2_fill_super(struct super_block
*sb
, void *data
, int silent
)
148 struct jffs2_sb_info
*c
;
153 D1(printk(KERN_DEBUG
"jffs2_get_sb_mtd():"
154 " New superblock for device %d (\"%s\")\n",
155 sb
->s_mtd
->index
, sb
->s_mtd
->name
));
157 c
= kzalloc(sizeof(*c
), GFP_KERNEL
);
167 /* Initialize JFFS2 superblock locks, the further initialization will
169 mutex_init(&c
->alloc_sem
);
170 mutex_init(&c
->erase_free_sem
);
171 init_waitqueue_head(&c
->erase_wait
);
172 init_waitqueue_head(&c
->inocache_wq
);
173 spin_lock_init(&c
->erase_completion_lock
);
174 spin_lock_init(&c
->inocache_lock
);
176 sb
->s_op
= &jffs2_super_operations
;
177 sb
->s_export_op
= &jffs2_export_ops
;
178 sb
->s_flags
= sb
->s_flags
| MS_NOATIME
;
179 sb
->s_xattr
= jffs2_xattr_handlers
;
180 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
181 sb
->s_flags
|= MS_POSIXACL
;
183 ret
= jffs2_do_fill_super(sb
, data
, silent
);
188 static int jffs2_get_sb(struct file_system_type
*fs_type
,
189 int flags
, const char *dev_name
,
190 void *data
, struct vfsmount
*mnt
)
192 return get_sb_mtd(fs_type
, flags
, dev_name
, data
, jffs2_fill_super
,
196 static void jffs2_put_super (struct super_block
*sb
)
198 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
200 D2(printk(KERN_DEBUG
"jffs2: jffs2_put_super()\n"));
205 jffs2_write_super(sb
);
207 mutex_lock(&c
->alloc_sem
);
208 jffs2_flush_wbuf_pad(c
);
209 mutex_unlock(&c
->alloc_sem
);
213 jffs2_free_ino_caches(c
);
214 jffs2_free_raw_node_refs(c
);
215 if (jffs2_blocks_use_vmalloc(c
))
219 jffs2_flash_cleanup(c
);
220 kfree(c
->inocache_list
);
221 jffs2_clear_xattr_subsystem(c
);
223 c
->mtd
->sync(c
->mtd
);
227 D1(printk(KERN_DEBUG
"jffs2_put_super returning\n"));
230 static void jffs2_kill_sb(struct super_block
*sb
)
232 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
233 if (!(sb
->s_flags
& MS_RDONLY
))
234 jffs2_stop_garbage_collect_thread(c
);
239 static struct file_system_type jffs2_fs_type
= {
240 .owner
= THIS_MODULE
,
242 .get_sb
= jffs2_get_sb
,
243 .kill_sb
= jffs2_kill_sb
,
246 static int __init
init_jffs2_fs(void)
250 /* Paranoia checks for on-medium structures. If we ask GCC
251 to pack them with __attribute__((packed)) then it _also_
252 assumes that they're not aligned -- so it emits crappy
253 code on some architectures. Ideally we want an attribute
254 which means just 'no padding', without the alignment
255 thing. But GCC doesn't have that -- we have to just
256 hope the structs are the right sizes, instead. */
257 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node
) != 12);
258 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent
) != 40);
259 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode
) != 68);
260 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary
) != 32);
262 printk(KERN_INFO
"JFFS2 version 2.2."
263 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
266 #ifdef CONFIG_JFFS2_SUMMARY
269 " © 2001-2006 Red Hat, Inc.\n");
271 jffs2_inode_cachep
= kmem_cache_create("jffs2_i",
272 sizeof(struct jffs2_inode_info
),
273 0, (SLAB_RECLAIM_ACCOUNT
|
276 if (!jffs2_inode_cachep
) {
277 printk(KERN_ERR
"JFFS2 error: Failed to initialise inode cache\n");
280 ret
= jffs2_compressors_init();
282 printk(KERN_ERR
"JFFS2 error: Failed to initialise compressors\n");
285 ret
= jffs2_create_slab_caches();
287 printk(KERN_ERR
"JFFS2 error: Failed to initialise slab caches\n");
288 goto out_compressors
;
290 ret
= register_filesystem(&jffs2_fs_type
);
292 printk(KERN_ERR
"JFFS2 error: Failed to register filesystem\n");
298 jffs2_destroy_slab_caches();
300 jffs2_compressors_exit();
302 kmem_cache_destroy(jffs2_inode_cachep
);
306 static void __exit
exit_jffs2_fs(void)
308 unregister_filesystem(&jffs2_fs_type
);
309 jffs2_destroy_slab_caches();
310 jffs2_compressors_exit();
311 kmem_cache_destroy(jffs2_inode_cachep
);
314 module_init(init_jffs2_fs
);
315 module_exit(exit_jffs2_fs
);
317 MODULE_DESCRIPTION("The Journalling Flash File System, v2");
318 MODULE_AUTHOR("Red Hat, Inc.");
319 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
320 // the sake of this tag. It's Free Software.