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/init.h>
16 #include <linux/list.h>
18 #include <linux/err.h>
19 #include <linux/mount.h>
20 #include <linux/jffs2.h>
21 #include <linux/pagemap.h>
22 #include <linux/mtd/super.h>
23 #include <linux/ctype.h>
24 #include <linux/namei.h>
25 #include <linux/exportfs.h>
29 static void jffs2_put_super(struct super_block
*);
31 static struct kmem_cache
*jffs2_inode_cachep
;
33 static struct inode
*jffs2_alloc_inode(struct super_block
*sb
)
35 struct jffs2_inode_info
*f
;
37 f
= kmem_cache_alloc(jffs2_inode_cachep
, GFP_KERNEL
);
43 static void jffs2_destroy_inode(struct inode
*inode
)
45 kmem_cache_free(jffs2_inode_cachep
, JFFS2_INODE_INFO(inode
));
48 static void jffs2_i_init_once(void *foo
)
50 struct jffs2_inode_info
*f
= foo
;
53 inode_init_once(&f
->vfs_inode
);
56 static void jffs2_write_super(struct super_block
*sb
)
58 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
63 if (!(sb
->s_flags
& MS_RDONLY
)) {
64 D1(printk(KERN_DEBUG
"jffs2_write_super()\n"));
65 jffs2_garbage_collect_trigger(c
);
66 jffs2_erase_pending_blocks(c
, 0);
67 jffs2_flush_wbuf_gc(c
, 0);
73 static int jffs2_sync_fs(struct super_block
*sb
, int wait
)
75 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
77 mutex_lock(&c
->alloc_sem
);
78 jffs2_flush_wbuf_pad(c
);
79 mutex_unlock(&c
->alloc_sem
);
83 static struct inode
*jffs2_nfs_get_inode(struct super_block
*sb
, uint64_t ino
,
86 /* We don't care about i_generation. We'll destroy the flash
87 before we start re-using inode numbers anyway. And even
88 if that wasn't true, we'd have other problems...*/
89 return jffs2_iget(sb
, ino
);
92 static struct dentry
*jffs2_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
93 int fh_len
, int fh_type
)
95 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
99 static struct dentry
*jffs2_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
100 int fh_len
, int fh_type
)
102 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
103 jffs2_nfs_get_inode
);
106 static struct dentry
*jffs2_get_parent(struct dentry
*child
)
108 struct jffs2_inode_info
*f
;
111 BUG_ON(!S_ISDIR(child
->d_inode
->i_mode
));
113 f
= JFFS2_INODE_INFO(child
->d_inode
);
115 pino
= f
->inocache
->pino_nlink
;
117 JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
118 f
->inocache
->ino
, pino
);
120 return d_obtain_alias(jffs2_iget(child
->d_inode
->i_sb
, pino
));
123 static struct export_operations jffs2_export_ops
= {
124 .get_parent
= jffs2_get_parent
,
125 .fh_to_dentry
= jffs2_fh_to_dentry
,
126 .fh_to_parent
= jffs2_fh_to_parent
,
129 static const struct super_operations jffs2_super_operations
=
131 .alloc_inode
= jffs2_alloc_inode
,
132 .destroy_inode
=jffs2_destroy_inode
,
133 .put_super
= jffs2_put_super
,
134 .write_super
= jffs2_write_super
,
135 .statfs
= jffs2_statfs
,
136 .remount_fs
= jffs2_remount_fs
,
137 .clear_inode
= jffs2_clear_inode
,
138 .dirty_inode
= jffs2_dirty_inode
,
139 .sync_fs
= jffs2_sync_fs
,
143 * fill in the superblock
145 static int jffs2_fill_super(struct super_block
*sb
, void *data
, int silent
)
147 struct jffs2_sb_info
*c
;
149 D1(printk(KERN_DEBUG
"jffs2_get_sb_mtd():"
150 " New superblock for device %d (\"%s\")\n",
151 sb
->s_mtd
->index
, sb
->s_mtd
->name
));
153 c
= kzalloc(sizeof(*c
), GFP_KERNEL
);
161 /* Initialize JFFS2 superblock locks, the further initialization will
163 mutex_init(&c
->alloc_sem
);
164 mutex_init(&c
->erase_free_sem
);
165 init_waitqueue_head(&c
->erase_wait
);
166 init_waitqueue_head(&c
->inocache_wq
);
167 spin_lock_init(&c
->erase_completion_lock
);
168 spin_lock_init(&c
->inocache_lock
);
170 sb
->s_op
= &jffs2_super_operations
;
171 sb
->s_export_op
= &jffs2_export_ops
;
172 sb
->s_flags
= sb
->s_flags
| MS_NOATIME
;
173 sb
->s_xattr
= jffs2_xattr_handlers
;
174 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
175 sb
->s_flags
|= MS_POSIXACL
;
177 return jffs2_do_fill_super(sb
, data
, silent
);
180 static int jffs2_get_sb(struct file_system_type
*fs_type
,
181 int flags
, const char *dev_name
,
182 void *data
, struct vfsmount
*mnt
)
184 return get_sb_mtd(fs_type
, flags
, dev_name
, data
, jffs2_fill_super
,
188 static void jffs2_put_super (struct super_block
*sb
)
190 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
192 D2(printk(KERN_DEBUG
"jffs2: jffs2_put_super()\n"));
197 jffs2_write_super(sb
);
199 mutex_lock(&c
->alloc_sem
);
200 jffs2_flush_wbuf_pad(c
);
201 mutex_unlock(&c
->alloc_sem
);
205 jffs2_free_ino_caches(c
);
206 jffs2_free_raw_node_refs(c
);
207 if (jffs2_blocks_use_vmalloc(c
))
211 jffs2_flash_cleanup(c
);
212 kfree(c
->inocache_list
);
213 jffs2_clear_xattr_subsystem(c
);
215 c
->mtd
->sync(c
->mtd
);
219 D1(printk(KERN_DEBUG
"jffs2_put_super returning\n"));
222 static void jffs2_kill_sb(struct super_block
*sb
)
224 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
225 if (!(sb
->s_flags
& MS_RDONLY
))
226 jffs2_stop_garbage_collect_thread(c
);
231 static struct file_system_type jffs2_fs_type
= {
232 .owner
= THIS_MODULE
,
234 .get_sb
= jffs2_get_sb
,
235 .kill_sb
= jffs2_kill_sb
,
238 static int __init
init_jffs2_fs(void)
242 /* Paranoia checks for on-medium structures. If we ask GCC
243 to pack them with __attribute__((packed)) then it _also_
244 assumes that they're not aligned -- so it emits crappy
245 code on some architectures. Ideally we want an attribute
246 which means just 'no padding', without the alignment
247 thing. But GCC doesn't have that -- we have to just
248 hope the structs are the right sizes, instead. */
249 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node
) != 12);
250 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent
) != 40);
251 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode
) != 68);
252 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary
) != 32);
254 printk(KERN_INFO
"JFFS2 version 2.2."
255 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
258 #ifdef CONFIG_JFFS2_SUMMARY
261 " © 2001-2006 Red Hat, Inc.\n");
263 jffs2_inode_cachep
= kmem_cache_create("jffs2_i",
264 sizeof(struct jffs2_inode_info
),
265 0, (SLAB_RECLAIM_ACCOUNT
|
268 if (!jffs2_inode_cachep
) {
269 printk(KERN_ERR
"JFFS2 error: Failed to initialise inode cache\n");
272 ret
= jffs2_compressors_init();
274 printk(KERN_ERR
"JFFS2 error: Failed to initialise compressors\n");
277 ret
= jffs2_create_slab_caches();
279 printk(KERN_ERR
"JFFS2 error: Failed to initialise slab caches\n");
280 goto out_compressors
;
282 ret
= register_filesystem(&jffs2_fs_type
);
284 printk(KERN_ERR
"JFFS2 error: Failed to register filesystem\n");
290 jffs2_destroy_slab_caches();
292 jffs2_compressors_exit();
294 kmem_cache_destroy(jffs2_inode_cachep
);
298 static void __exit
exit_jffs2_fs(void)
300 unregister_filesystem(&jffs2_fs_type
);
301 jffs2_destroy_slab_caches();
302 jffs2_compressors_exit();
303 kmem_cache_destroy(jffs2_inode_cachep
);
306 module_init(init_jffs2_fs
);
307 module_exit(exit_jffs2_fs
);
309 MODULE_DESCRIPTION("The Journalling Flash File System, v2");
310 MODULE_AUTHOR("Red Hat, Inc.");
311 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
312 // the sake of this tag. It's Free Software.