Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
| 3 | * |
David Woodhouse | c00c310 | 2007-04-25 14:16:47 +0100 | [diff] [blame] | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Created by David Woodhouse <dwmw2@infradead.org> |
| 7 | * |
| 8 | * For licensing information, see the file 'LICENCE' in this directory. |
| 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/slab.h> |
Alexey Dobriyan | 405f557 | 2009-07-11 22:08:37 +0400 | [diff] [blame] | 15 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/init.h> |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/fs.h> |
Artem Bityutskiy | 9c74034 | 2006-10-11 14:52:47 +0300 | [diff] [blame] | 19 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/mount.h> |
| 21 | #include <linux/jffs2.h> |
| 22 | #include <linux/pagemap.h> |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 23 | #include <linux/mtd/super.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/ctype.h> |
| 25 | #include <linux/namei.h> |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 26 | #include <linux/exportfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "compr.h" |
| 28 | #include "nodelist.h" |
| 29 | |
| 30 | static void jffs2_put_super(struct super_block *); |
| 31 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 32 | static struct kmem_cache *jffs2_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | static struct inode *jffs2_alloc_inode(struct super_block *sb) |
| 35 | { |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 36 | struct jffs2_inode_info *f; |
| 37 | |
| 38 | f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); |
| 39 | if (!f) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | return NULL; |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 41 | return &f->vfs_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | static void jffs2_destroy_inode(struct inode *inode) |
| 45 | { |
| 46 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); |
| 47 | } |
| 48 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 49 | static void jffs2_i_init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 51 | struct jffs2_inode_info *f = foo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 53 | mutex_init(&f->sem); |
| 54 | inode_init_once(&f->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Christoph Hellwig | 01ba687 | 2009-05-11 23:34:27 +0200 | [diff] [blame] | 57 | static void jffs2_write_super(struct super_block *sb) |
| 58 | { |
| 59 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 60 | |
| 61 | lock_super(sb); |
Christoph Hellwig | 01ba687 | 2009-05-11 23:34:27 +0200 | [diff] [blame] | 62 | sb->s_dirt = 0; |
| 63 | |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 64 | if (!(sb->s_flags & MS_RDONLY)) { |
| 65 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 66 | jffs2_flush_wbuf_gc(c, 0); |
| 67 | } |
Christoph Hellwig | 01ba687 | 2009-05-11 23:34:27 +0200 | [diff] [blame] | 68 | |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 69 | unlock_super(sb); |
Christoph Hellwig | 01ba687 | 2009-05-11 23:34:27 +0200 | [diff] [blame] | 70 | } |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
| 73 | { |
| 74 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| 75 | |
Christoph Hellwig | d579ed0 | 2009-06-08 10:08:21 +0200 | [diff] [blame] | 76 | jffs2_write_super(sb); |
| 77 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 78 | mutex_lock(&c->alloc_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | jffs2_flush_wbuf_pad(c); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 80 | mutex_unlock(&c->alloc_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | return 0; |
| 82 | } |
| 83 | |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 84 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
| 85 | uint32_t generation) |
| 86 | { |
| 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); |
| 91 | } |
| 92 | |
| 93 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 94 | int fh_len, int fh_type) |
| 95 | { |
| 96 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 97 | jffs2_nfs_get_inode); |
| 98 | } |
| 99 | |
| 100 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 101 | int fh_len, int fh_type) |
| 102 | { |
| 103 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 104 | jffs2_nfs_get_inode); |
| 105 | } |
| 106 | |
| 107 | static struct dentry *jffs2_get_parent(struct dentry *child) |
| 108 | { |
| 109 | struct jffs2_inode_info *f; |
| 110 | uint32_t pino; |
| 111 | |
| 112 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); |
| 113 | |
| 114 | f = JFFS2_INODE_INFO(child->d_inode); |
| 115 | |
| 116 | pino = f->inocache->pino_nlink; |
| 117 | |
| 118 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", |
| 119 | f->inocache->ino, pino); |
| 120 | |
| 121 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); |
| 122 | } |
| 123 | |
Alexey Dobriyan | ac4cfdd | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 124 | static const struct export_operations jffs2_export_ops = { |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 125 | .get_parent = jffs2_get_parent, |
| 126 | .fh_to_dentry = jffs2_fh_to_dentry, |
| 127 | .fh_to_parent = jffs2_fh_to_parent, |
| 128 | }; |
| 129 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 130 | static const struct super_operations jffs2_super_operations = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
| 132 | .alloc_inode = jffs2_alloc_inode, |
| 133 | .destroy_inode =jffs2_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | .put_super = jffs2_put_super, |
| 135 | .write_super = jffs2_write_super, |
| 136 | .statfs = jffs2_statfs, |
| 137 | .remount_fs = jffs2_remount_fs, |
| 138 | .clear_inode = jffs2_clear_inode, |
| 139 | .dirty_inode = jffs2_dirty_inode, |
| 140 | .sync_fs = jffs2_sync_fs, |
| 141 | }; |
| 142 | |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 143 | /* |
| 144 | * fill in the superblock |
| 145 | */ |
| 146 | static int jffs2_fill_super(struct super_block *sb, void *data, int silent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | struct jffs2_sb_info *c; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 149 | |
| 150 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():" |
| 151 | " New superblock for device %d (\"%s\")\n", |
| 152 | sb->s_mtd->index, sb->s_mtd->name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 154 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if (!c) |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 156 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 158 | c->mtd = sb->s_mtd; |
| 159 | c->os_priv = sb; |
| 160 | sb->s_fs_info = c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 162 | /* Initialize JFFS2 superblock locks, the further initialization will |
| 163 | * be done later */ |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 164 | mutex_init(&c->alloc_sem); |
| 165 | mutex_init(&c->erase_free_sem); |
Artem B. Bityuckiy | b622059 | 2005-07-12 17:37:12 +0100 | [diff] [blame] | 166 | init_waitqueue_head(&c->erase_wait); |
| 167 | init_waitqueue_head(&c->inocache_wq); |
| 168 | spin_lock_init(&c->erase_completion_lock); |
| 169 | spin_lock_init(&c->inocache_lock); |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | sb->s_op = &jffs2_super_operations; |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 172 | sb->s_export_op = &jffs2_export_ops; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 173 | sb->s_flags = sb->s_flags | MS_NOATIME; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 174 | sb->s_xattr = jffs2_xattr_handlers; |
| 175 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL |
| 176 | sb->s_flags |= MS_POSIXACL; |
| 177 | #endif |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 178 | return jffs2_do_fill_super(sb, data, silent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 181 | static int jffs2_get_sb(struct file_system_type *fs_type, |
| 182 | int flags, const char *dev_name, |
| 183 | void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 185 | return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super, |
| 186 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | static void jffs2_put_super (struct super_block *sb) |
| 190 | { |
| 191 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| 192 | |
| 193 | D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); |
| 194 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 195 | lock_kernel(); |
| 196 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 197 | if (sb->s_dirt) |
| 198 | jffs2_write_super(sb); |
| 199 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 200 | mutex_lock(&c->alloc_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | jffs2_flush_wbuf_pad(c); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 202 | mutex_unlock(&c->alloc_sem); |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 203 | |
| 204 | jffs2_sum_exit(c); |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | jffs2_free_ino_caches(c); |
| 207 | jffs2_free_raw_node_refs(c); |
Ferenc Havasi | 4ce1f56 | 2005-08-31 14:51:04 +0100 | [diff] [blame] | 208 | if (jffs2_blocks_use_vmalloc(c)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | vfree(c->blocks); |
| 210 | else |
| 211 | kfree(c->blocks); |
| 212 | jffs2_flash_cleanup(c); |
| 213 | kfree(c->inocache_list); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 214 | jffs2_clear_xattr_subsystem(c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | if (c->mtd->sync) |
| 216 | c->mtd->sync(c->mtd); |
| 217 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 218 | unlock_kernel(); |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); |
| 221 | } |
| 222 | |
| 223 | static void jffs2_kill_sb(struct super_block *sb) |
| 224 | { |
| 225 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
Artem B. Bityuckiy | a69dde9 | 2005-05-18 12:37:28 +0100 | [diff] [blame] | 226 | if (!(sb->s_flags & MS_RDONLY)) |
| 227 | jffs2_stop_garbage_collect_thread(c); |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 228 | kill_mtd_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | kfree(c); |
| 230 | } |
| 231 | |
| 232 | static struct file_system_type jffs2_fs_type = { |
| 233 | .owner = THIS_MODULE, |
| 234 | .name = "jffs2", |
| 235 | .get_sb = jffs2_get_sb, |
| 236 | .kill_sb = jffs2_kill_sb, |
| 237 | }; |
| 238 | |
| 239 | static int __init init_jffs2_fs(void) |
| 240 | { |
| 241 | int ret; |
| 242 | |
David Woodhouse | 3e68fbb | 2006-05-15 00:49:43 +0100 | [diff] [blame] | 243 | /* Paranoia checks for on-medium structures. If we ask GCC |
| 244 | to pack them with __attribute__((packed)) then it _also_ |
| 245 | assumes that they're not aligned -- so it emits crappy |
| 246 | code on some architectures. Ideally we want an attribute |
| 247 | which means just 'no padding', without the alignment |
| 248 | thing. But GCC doesn't have that -- we have to just |
| 249 | hope the structs are the right sizes, instead. */ |
Alexey Dobriyan | 2ecd05a | 2006-10-11 01:22:05 -0700 | [diff] [blame] | 250 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
| 251 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); |
| 252 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); |
| 253 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); |
David Woodhouse | 3e68fbb | 2006-05-15 00:49:43 +0100 | [diff] [blame] | 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | printk(KERN_INFO "JFFS2 version 2.2." |
Andrew Victor | 2f82ce1 | 2005-02-09 09:24:26 +0000 | [diff] [blame] | 256 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | " (NAND)" |
| 258 | #endif |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 259 | #ifdef CONFIG_JFFS2_SUMMARY |
| 260 | " (SUMMARY) " |
| 261 | #endif |
David Woodhouse | c00c310 | 2007-04-25 14:16:47 +0100 | [diff] [blame] | 262 | " © 2001-2006 Red Hat, Inc.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", |
| 265 | sizeof(struct jffs2_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 266 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 267 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 268 | jffs2_i_init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | if (!jffs2_inode_cachep) { |
| 270 | printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n"); |
| 271 | return -ENOMEM; |
| 272 | } |
| 273 | ret = jffs2_compressors_init(); |
| 274 | if (ret) { |
| 275 | printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n"); |
| 276 | goto out; |
| 277 | } |
| 278 | ret = jffs2_create_slab_caches(); |
| 279 | if (ret) { |
| 280 | printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n"); |
| 281 | goto out_compressors; |
| 282 | } |
| 283 | ret = register_filesystem(&jffs2_fs_type); |
| 284 | if (ret) { |
| 285 | printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n"); |
| 286 | goto out_slab; |
| 287 | } |
| 288 | return 0; |
| 289 | |
| 290 | out_slab: |
| 291 | jffs2_destroy_slab_caches(); |
| 292 | out_compressors: |
| 293 | jffs2_compressors_exit(); |
| 294 | out: |
| 295 | kmem_cache_destroy(jffs2_inode_cachep); |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | static void __exit exit_jffs2_fs(void) |
| 300 | { |
| 301 | unregister_filesystem(&jffs2_fs_type); |
| 302 | jffs2_destroy_slab_caches(); |
| 303 | jffs2_compressors_exit(); |
| 304 | kmem_cache_destroy(jffs2_inode_cachep); |
| 305 | } |
| 306 | |
| 307 | module_init(init_jffs2_fs); |
| 308 | module_exit(exit_jffs2_fs); |
| 309 | |
| 310 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); |
| 311 | MODULE_AUTHOR("Red Hat, Inc."); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 312 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | // the sake of this tag. It's Free Software. |