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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2001-2007 Red Hat, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#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>
Artem Bityutskiy9c740342006-10-11 14:52:47 +030018#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/mount.h>
20#include <linux/jffs2.h>
21#include <linux/pagemap.h>
David Howellsacaebfd2007-05-10 22:51:50 -070022#include <linux/mtd/super.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/ctype.h>
24#include <linux/namei.h>
25#include "compr.h"
26#include "nodelist.h"
27
28static void jffs2_put_super(struct super_block *);
29
Christoph Lametere18b8902006-12-06 20:33:20 -080030static struct kmem_cache *jffs2_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32static struct inode *jffs2_alloc_inode(struct super_block *sb)
33{
34 struct jffs2_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080035 ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 if (!ei)
37 return NULL;
38 return &ei->vfs_inode;
39}
40
41static void jffs2_destroy_inode(struct inode *inode)
42{
43 kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
44}
45
Christoph Lametere18b8902006-12-06 20:33:20 -080046static void jffs2_i_init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
48 struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo;
49
Christoph Lametera35afb82007-05-16 22:10:57 -070050 init_MUTEX(&ei->sem);
51 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
54static 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);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000060 up(&c->alloc_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 return 0;
62}
63
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080064static const struct super_operations jffs2_super_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
66 .alloc_inode = jffs2_alloc_inode,
67 .destroy_inode =jffs2_destroy_inode,
68 .read_inode = jffs2_read_inode,
69 .put_super = jffs2_put_super,
70 .write_super = jffs2_write_super,
71 .statfs = jffs2_statfs,
72 .remount_fs = jffs2_remount_fs,
73 .clear_inode = jffs2_clear_inode,
74 .dirty_inode = jffs2_dirty_inode,
75 .sync_fs = jffs2_sync_fs,
76};
77
David Howellsacaebfd2007-05-10 22:51:50 -070078/*
79 * fill in the superblock
80 */
81static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 struct jffs2_sb_info *c;
David Howellsacaebfd2007-05-10 22:51:50 -070084
85 D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
86 " New superblock for device %d (\"%s\")\n",
87 sb->s_mtd->index, sb->s_mtd->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -070089 c = kzalloc(sizeof(*c), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 if (!c)
David Howells454e2392006-06-23 02:02:57 -070091 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
David Howellsacaebfd2007-05-10 22:51:50 -070093 c->mtd = sb->s_mtd;
94 c->os_priv = sb;
95 sb->s_fs_info = c;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
David Howellsacaebfd2007-05-10 22:51:50 -070097 /* Initialize JFFS2 superblock locks, the further initialization will
98 * be done later */
Artem B. Bityuckiyb6220592005-07-12 17:37:12 +010099 init_MUTEX(&c->alloc_sem);
100 init_MUTEX(&c->erase_free_sem);
101 init_waitqueue_head(&c->erase_wait);
102 init_waitqueue_head(&c->inocache_wq);
103 spin_lock_init(&c->erase_completion_lock);
104 spin_lock_init(&c->inocache_lock);
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 sb->s_op = &jffs2_super_operations;
David Howellsacaebfd2007-05-10 22:51:50 -0700107 sb->s_flags = sb->s_flags | MS_NOATIME;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900108 sb->s_xattr = jffs2_xattr_handlers;
109#ifdef CONFIG_JFFS2_FS_POSIX_ACL
110 sb->s_flags |= MS_POSIXACL;
111#endif
David Howellsacaebfd2007-05-10 22:51:50 -0700112 return jffs2_do_fill_super(sb, data, silent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
David Howells454e2392006-06-23 02:02:57 -0700115static int jffs2_get_sb(struct file_system_type *fs_type,
116 int flags, const char *dev_name,
117 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
David Howellsacaebfd2007-05-10 22:51:50 -0700119 return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super,
120 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121}
122
123static void jffs2_put_super (struct super_block *sb)
124{
125 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
126
127 D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 down(&c->alloc_sem);
130 jffs2_flush_wbuf_pad(c);
131 up(&c->alloc_sem);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100132
133 jffs2_sum_exit(c);
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 jffs2_free_ino_caches(c);
136 jffs2_free_raw_node_refs(c);
Ferenc Havasi4ce1f562005-08-31 14:51:04 +0100137 if (jffs2_blocks_use_vmalloc(c))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 vfree(c->blocks);
139 else
140 kfree(c->blocks);
141 jffs2_flash_cleanup(c);
142 kfree(c->inocache_list);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900143 jffs2_clear_xattr_subsystem(c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 if (c->mtd->sync)
145 c->mtd->sync(c->mtd);
146
147 D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
148}
149
150static void jffs2_kill_sb(struct super_block *sb)
151{
152 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
Artem B. Bityuckiya69dde92005-05-18 12:37:28 +0100153 if (!(sb->s_flags & MS_RDONLY))
154 jffs2_stop_garbage_collect_thread(c);
David Howellsacaebfd2007-05-10 22:51:50 -0700155 kill_mtd_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 kfree(c);
157}
158
159static struct file_system_type jffs2_fs_type = {
160 .owner = THIS_MODULE,
161 .name = "jffs2",
162 .get_sb = jffs2_get_sb,
163 .kill_sb = jffs2_kill_sb,
164};
165
166static int __init init_jffs2_fs(void)
167{
168 int ret;
169
David Woodhouse3e68fbb2006-05-15 00:49:43 +0100170 /* Paranoia checks for on-medium structures. If we ask GCC
171 to pack them with __attribute__((packed)) then it _also_
172 assumes that they're not aligned -- so it emits crappy
173 code on some architectures. Ideally we want an attribute
174 which means just 'no padding', without the alignment
175 thing. But GCC doesn't have that -- we have to just
176 hope the structs are the right sizes, instead. */
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700177 BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
178 BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
179 BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
180 BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
David Woodhouse3e68fbb2006-05-15 00:49:43 +0100181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 printk(KERN_INFO "JFFS2 version 2.2."
Andrew Victor2f82ce12005-02-09 09:24:26 +0000183#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 " (NAND)"
185#endif
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100186#ifdef CONFIG_JFFS2_SUMMARY
187 " (SUMMARY) "
188#endif
David Woodhousec00c3102007-04-25 14:16:47 +0100189 " © 2001-2006 Red Hat, Inc.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 jffs2_inode_cachep = kmem_cache_create("jffs2_i",
192 sizeof(struct jffs2_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800193 0, (SLAB_RECLAIM_ACCOUNT|
194 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900195 jffs2_i_init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 if (!jffs2_inode_cachep) {
197 printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
198 return -ENOMEM;
199 }
200 ret = jffs2_compressors_init();
201 if (ret) {
202 printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
203 goto out;
204 }
205 ret = jffs2_create_slab_caches();
206 if (ret) {
207 printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
208 goto out_compressors;
209 }
210 ret = register_filesystem(&jffs2_fs_type);
211 if (ret) {
212 printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
213 goto out_slab;
214 }
215 return 0;
216
217 out_slab:
218 jffs2_destroy_slab_caches();
219 out_compressors:
220 jffs2_compressors_exit();
221 out:
222 kmem_cache_destroy(jffs2_inode_cachep);
223 return ret;
224}
225
226static void __exit exit_jffs2_fs(void)
227{
228 unregister_filesystem(&jffs2_fs_type);
229 jffs2_destroy_slab_caches();
230 jffs2_compressors_exit();
231 kmem_cache_destroy(jffs2_inode_cachep);
232}
233
234module_init(init_jffs2_fs);
235module_exit(exit_jffs2_fs);
236
237MODULE_DESCRIPTION("The Journalling Flash File System, v2");
238MODULE_AUTHOR("Red Hat, Inc.");
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000239MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 // the sake of this tag. It's Free Software.