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/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 "compr.h"
26 #include "nodelist.h"
27
28 static void jffs2_put_super(struct super_block *);
29
30 static struct kmem_cache *jffs2_inode_cachep;
31
32 static struct inode *jffs2_alloc_inode(struct super_block *sb)
33 {
34 struct jffs2_inode_info *ei;
35 ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
36 if (!ei)
37 return NULL;
38 return &ei->vfs_inode;
39 }
40
41 static void jffs2_destroy_inode(struct inode *inode)
42 {
43 kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
44 }
45
46 static void jffs2_i_init_once(struct kmem_cache *cachep, void *foo)
47 {
48 struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo;
49
50 init_MUTEX(&ei->sem);
51 inode_init_once(&ei->vfs_inode);
52 }
53
54 static int jffs2_sync_fs(struct super_block *sb, int wait)
55 {
56 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
57
58 down(&c->alloc_sem);
59 jffs2_flush_wbuf_pad(c);
60 up(&c->alloc_sem);
61 return 0;
62 }
63
64 static const struct super_operations jffs2_super_operations =
65 {
66 .alloc_inode = jffs2_alloc_inode,
67 .destroy_inode =jffs2_destroy_inode,
68 .put_super = jffs2_put_super,
69 .write_super = jffs2_write_super,
70 .statfs = jffs2_statfs,
71 .remount_fs = jffs2_remount_fs,
72 .clear_inode = jffs2_clear_inode,
73 .dirty_inode = jffs2_dirty_inode,
74 .sync_fs = jffs2_sync_fs,
75 };
76
77 /*
78 * fill in the superblock
79 */
80 static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
81 {
82 struct jffs2_sb_info *c;
83
84 D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
85 " New superblock for device %d (\"%s\")\n",
86 sb->s_mtd->index, sb->s_mtd->name));
87
88 c = kzalloc(sizeof(*c), GFP_KERNEL);
89 if (!c)
90 return -ENOMEM;
91
92 c->mtd = sb->s_mtd;
93 c->os_priv = sb;
94 sb->s_fs_info = c;
95
96 /* Initialize JFFS2 superblock locks, the further initialization will
97 * be done later */
98 init_MUTEX(&c->alloc_sem);
99 init_MUTEX(&c->erase_free_sem);
100 init_waitqueue_head(&c->erase_wait);
101 init_waitqueue_head(&c->inocache_wq);
102 spin_lock_init(&c->erase_completion_lock);
103 spin_lock_init(&c->inocache_lock);
104
105 sb->s_op = &jffs2_super_operations;
106 sb->s_flags = sb->s_flags | MS_NOATIME;
107 sb->s_xattr = jffs2_xattr_handlers;
108 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
109 sb->s_flags |= MS_POSIXACL;
110 #endif
111 return jffs2_do_fill_super(sb, data, silent);
112 }
113
114 static int jffs2_get_sb(struct file_system_type *fs_type,
115 int flags, const char *dev_name,
116 void *data, struct vfsmount *mnt)
117 {
118 return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super,
119 mnt);
120 }
121
122 static void jffs2_put_super (struct super_block *sb)
123 {
124 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
125
126 D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
127
128 down(&c->alloc_sem);
129 jffs2_flush_wbuf_pad(c);
130 up(&c->alloc_sem);
131
132 jffs2_sum_exit(c);
133
134 jffs2_free_ino_caches(c);
135 jffs2_free_raw_node_refs(c);
136 if (jffs2_blocks_use_vmalloc(c))
137 vfree(c->blocks);
138 else
139 kfree(c->blocks);
140 jffs2_flash_cleanup(c);
141 kfree(c->inocache_list);
142 jffs2_clear_xattr_subsystem(c);
143 if (c->mtd->sync)
144 c->mtd->sync(c->mtd);
145
146 D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
147 }
148
149 static void jffs2_kill_sb(struct super_block *sb)
150 {
151 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
152 if (!(sb->s_flags & MS_RDONLY))
153 jffs2_stop_garbage_collect_thread(c);
154 kill_mtd_super(sb);
155 kfree(c);
156 }
157
158 static struct file_system_type jffs2_fs_type = {
159 .owner = THIS_MODULE,
160 .name = "jffs2",
161 .get_sb = jffs2_get_sb,
162 .kill_sb = jffs2_kill_sb,
163 };
164
165 static int __init init_jffs2_fs(void)
166 {
167 int ret;
168
169 /* Paranoia checks for on-medium structures. If we ask GCC
170 to pack them with __attribute__((packed)) then it _also_
171 assumes that they're not aligned -- so it emits crappy
172 code on some architectures. Ideally we want an attribute
173 which means just 'no padding', without the alignment
174 thing. But GCC doesn't have that -- we have to just
175 hope the structs are the right sizes, instead. */
176 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
177 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
178 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
179 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
180
181 printk(KERN_INFO "JFFS2 version 2.2."
182 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
183 " (NAND)"
184 #endif
185 #ifdef CONFIG_JFFS2_SUMMARY
186 " (SUMMARY) "
187 #endif
188 " © 2001-2006 Red Hat, Inc.\n");
189
190 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
191 sizeof(struct jffs2_inode_info),
192 0, (SLAB_RECLAIM_ACCOUNT|
193 SLAB_MEM_SPREAD),
194 jffs2_i_init_once);
195 if (!jffs2_inode_cachep) {
196 printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
197 return -ENOMEM;
198 }
199 ret = jffs2_compressors_init();
200 if (ret) {
201 printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
202 goto out;
203 }
204 ret = jffs2_create_slab_caches();
205 if (ret) {
206 printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
207 goto out_compressors;
208 }
209 ret = register_filesystem(&jffs2_fs_type);
210 if (ret) {
211 printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
212 goto out_slab;
213 }
214 return 0;
215
216 out_slab:
217 jffs2_destroy_slab_caches();
218 out_compressors:
219 jffs2_compressors_exit();
220 out:
221 kmem_cache_destroy(jffs2_inode_cachep);
222 return ret;
223 }
224
225 static void __exit exit_jffs2_fs(void)
226 {
227 unregister_filesystem(&jffs2_fs_type);
228 jffs2_destroy_slab_caches();
229 jffs2_compressors_exit();
230 kmem_cache_destroy(jffs2_inode_cachep);
231 }
232
233 module_init(init_jffs2_fs);
234 module_exit(exit_jffs2_fs);
235
236 MODULE_DESCRIPTION("The Journalling Flash File System, v2");
237 MODULE_AUTHOR("Red Hat, Inc.");
238 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
239 // the sake of this tag. It's Free Software.
240
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