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>
28 static void jffs2_put_super(struct super_block
*);
30 static struct kmem_cache
*jffs2_inode_cachep
;
32 static struct inode
*jffs2_alloc_inode(struct super_block
*sb
)
34 struct jffs2_inode_info
*ei
;
35 ei
= (struct jffs2_inode_info
*)kmem_cache_alloc(jffs2_inode_cachep
, GFP_KERNEL
);
38 return &ei
->vfs_inode
;
41 static void jffs2_destroy_inode(struct inode
*inode
)
43 kmem_cache_free(jffs2_inode_cachep
, JFFS2_INODE_INFO(inode
));
46 static void jffs2_i_init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
48 struct jffs2_inode_info
*ei
= (struct jffs2_inode_info
*) foo
;
50 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
51 SLAB_CTOR_CONSTRUCTOR
) {
53 inode_init_once(&ei
->vfs_inode
);
57 static int jffs2_sync_fs(struct super_block
*sb
, int wait
)
59 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
62 jffs2_flush_wbuf_pad(c
);
67 static const struct super_operations jffs2_super_operations
=
69 .alloc_inode
= jffs2_alloc_inode
,
70 .destroy_inode
=jffs2_destroy_inode
,
71 .read_inode
= jffs2_read_inode
,
72 .put_super
= jffs2_put_super
,
73 .write_super
= jffs2_write_super
,
74 .statfs
= jffs2_statfs
,
75 .remount_fs
= jffs2_remount_fs
,
76 .clear_inode
= jffs2_clear_inode
,
77 .dirty_inode
= jffs2_dirty_inode
,
78 .sync_fs
= jffs2_sync_fs
,
82 * fill in the superblock
84 static int jffs2_fill_super(struct super_block
*sb
, void *data
, int silent
)
86 struct jffs2_sb_info
*c
;
88 D1(printk(KERN_DEBUG
"jffs2_get_sb_mtd():"
89 " New superblock for device %d (\"%s\")\n",
90 sb
->s_mtd
->index
, sb
->s_mtd
->name
));
92 c
= kzalloc(sizeof(*c
), GFP_KERNEL
);
100 /* Initialize JFFS2 superblock locks, the further initialization will
102 init_MUTEX(&c
->alloc_sem
);
103 init_MUTEX(&c
->erase_free_sem
);
104 init_waitqueue_head(&c
->erase_wait
);
105 init_waitqueue_head(&c
->inocache_wq
);
106 spin_lock_init(&c
->erase_completion_lock
);
107 spin_lock_init(&c
->inocache_lock
);
109 sb
->s_op
= &jffs2_super_operations
;
110 sb
->s_flags
= sb
->s_flags
| MS_NOATIME
;
111 sb
->s_xattr
= jffs2_xattr_handlers
;
112 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
113 sb
->s_flags
|= MS_POSIXACL
;
115 return jffs2_do_fill_super(sb
, data
, silent
);
118 static int jffs2_get_sb(struct file_system_type
*fs_type
,
119 int flags
, const char *dev_name
,
120 void *data
, struct vfsmount
*mnt
)
122 return get_sb_mtd(fs_type
, flags
, dev_name
, data
, jffs2_fill_super
,
126 static void jffs2_put_super (struct super_block
*sb
)
128 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
130 D2(printk(KERN_DEBUG
"jffs2: jffs2_put_super()\n"));
133 jffs2_flush_wbuf_pad(c
);
138 jffs2_free_ino_caches(c
);
139 jffs2_free_raw_node_refs(c
);
140 if (jffs2_blocks_use_vmalloc(c
))
144 jffs2_flash_cleanup(c
);
145 kfree(c
->inocache_list
);
146 jffs2_clear_xattr_subsystem(c
);
148 c
->mtd
->sync(c
->mtd
);
150 D1(printk(KERN_DEBUG
"jffs2_put_super returning\n"));
153 static void jffs2_kill_sb(struct super_block
*sb
)
155 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(sb
);
156 if (!(sb
->s_flags
& MS_RDONLY
))
157 jffs2_stop_garbage_collect_thread(c
);
162 static struct file_system_type jffs2_fs_type
= {
163 .owner
= THIS_MODULE
,
165 .get_sb
= jffs2_get_sb
,
166 .kill_sb
= jffs2_kill_sb
,
169 static int __init
init_jffs2_fs(void)
173 /* Paranoia checks for on-medium structures. If we ask GCC
174 to pack them with __attribute__((packed)) then it _also_
175 assumes that they're not aligned -- so it emits crappy
176 code on some architectures. Ideally we want an attribute
177 which means just 'no padding', without the alignment
178 thing. But GCC doesn't have that -- we have to just
179 hope the structs are the right sizes, instead. */
180 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node
) != 12);
181 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent
) != 40);
182 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode
) != 68);
183 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary
) != 32);
185 printk(KERN_INFO
"JFFS2 version 2.2."
186 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
189 #ifdef CONFIG_JFFS2_SUMMARY
192 " © 2001-2006 Red Hat, Inc.\n");
194 jffs2_inode_cachep
= kmem_cache_create("jffs2_i",
195 sizeof(struct jffs2_inode_info
),
196 0, (SLAB_RECLAIM_ACCOUNT
|
198 jffs2_i_init_once
, NULL
);
199 if (!jffs2_inode_cachep
) {
200 printk(KERN_ERR
"JFFS2 error: Failed to initialise inode cache\n");
203 ret
= jffs2_compressors_init();
205 printk(KERN_ERR
"JFFS2 error: Failed to initialise compressors\n");
208 ret
= jffs2_create_slab_caches();
210 printk(KERN_ERR
"JFFS2 error: Failed to initialise slab caches\n");
211 goto out_compressors
;
213 ret
= register_filesystem(&jffs2_fs_type
);
215 printk(KERN_ERR
"JFFS2 error: Failed to register filesystem\n");
221 jffs2_destroy_slab_caches();
223 jffs2_compressors_exit();
225 kmem_cache_destroy(jffs2_inode_cachep
);
229 static void __exit
exit_jffs2_fs(void)
231 unregister_filesystem(&jffs2_fs_type
);
232 jffs2_destroy_slab_caches();
233 jffs2_compressors_exit();
234 kmem_cache_destroy(jffs2_inode_cachep
);
237 module_init(init_jffs2_fs
);
238 module_exit(exit_jffs2_fs
);
240 MODULE_DESCRIPTION("The Journalling Flash File System, v2");
241 MODULE_AUTHOR("Red Hat, Inc.");
242 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
243 // the sake of this tag. It's Free Software.