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 *f; 35 36 f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); 37 if (!f) 38 return NULL; 39 return &f->vfs_inode; 40 } 41 42 static void jffs2_destroy_inode(struct inode *inode) 43 { 44 kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); 45 } 46 47 static void jffs2_i_init_once(struct kmem_cache *cachep, void *foo) 48 { 49 struct jffs2_inode_info *f = foo; 50 51 mutex_init(&f->sem); 52 inode_init_once(&f->vfs_inode); 53 } 54 55 static int jffs2_sync_fs(struct super_block *sb, int wait) 56 { 57 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 58 59 mutex_lock(&c->alloc_sem); 60 jffs2_flush_wbuf_pad(c); 61 mutex_unlock(&c->alloc_sem); 62 return 0; 63 } 64 65 static const struct super_operations jffs2_super_operations = 66 { 67 .alloc_inode = jffs2_alloc_inode, 68 .destroy_inode =jffs2_destroy_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 78 /* 79 * fill in the superblock 80 */ 81 static int jffs2_fill_super(struct super_block *sb, void *data, int silent) 82 { 83 struct jffs2_sb_info *c; 84 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)); 88 89 c = kzalloc(sizeof(*c), GFP_KERNEL); 90 if (!c) 91 return -ENOMEM; 92 93 c->mtd = sb->s_mtd; 94 c->os_priv = sb; 95 sb->s_fs_info = c; 96 97 /* Initialize JFFS2 superblock locks, the further initialization will 98 * be done later */ 99 mutex_init(&c->alloc_sem); 100 mutex_init(&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); 105 106 sb->s_op = &jffs2_super_operations; 107 sb->s_flags = sb->s_flags | MS_NOATIME; 108 sb->s_xattr = jffs2_xattr_handlers; 109 #ifdef CONFIG_JFFS2_FS_POSIX_ACL 110 sb->s_flags |= MS_POSIXACL; 111 #endif 112 return jffs2_do_fill_super(sb, data, silent); 113 } 114 115 static int jffs2_get_sb(struct file_system_type *fs_type, 116 int flags, const char *dev_name, 117 void *data, struct vfsmount *mnt) 118 { 119 return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super, 120 mnt); 121 } 122 123 static 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")); 128 129 mutex_lock(&c->alloc_sem); 130 jffs2_flush_wbuf_pad(c); 131 mutex_unlock(&c->alloc_sem); 132 133 jffs2_sum_exit(c); 134 135 jffs2_free_ino_caches(c); 136 jffs2_free_raw_node_refs(c); 137 if (jffs2_blocks_use_vmalloc(c)) 138 vfree(c->blocks); 139 else 140 kfree(c->blocks); 141 jffs2_flash_cleanup(c); 142 kfree(c->inocache_list); 143 jffs2_clear_xattr_subsystem(c); 144 if (c->mtd->sync) 145 c->mtd->sync(c->mtd); 146 147 D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); 148 } 149 150 static void jffs2_kill_sb(struct super_block *sb) 151 { 152 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 153 if (!(sb->s_flags & MS_RDONLY)) 154 jffs2_stop_garbage_collect_thread(c); 155 kill_mtd_super(sb); 156 kfree(c); 157 } 158 159 static 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 }; 165 166 static int __init init_jffs2_fs(void) 167 { 168 int ret; 169 170 /* 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. */ 177 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); 181 182 printk(KERN_INFO "JFFS2 version 2.2." 183 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 184 " (NAND)" 185 #endif 186 #ifdef CONFIG_JFFS2_SUMMARY 187 " (SUMMARY) " 188 #endif 189 " © 2001-2006 Red Hat, Inc.\n"); 190 191 jffs2_inode_cachep = kmem_cache_create("jffs2_i", 192 sizeof(struct jffs2_inode_info), 193 0, (SLAB_RECLAIM_ACCOUNT| 194 SLAB_MEM_SPREAD), 195 jffs2_i_init_once); 196 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 } 225 226 static 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 } 233 234 module_init(init_jffs2_fs); 235 module_exit(exit_jffs2_fs); 236 237 MODULE_DESCRIPTION("The Journalling Flash File System, v2"); 238 MODULE_AUTHOR("Red Hat, Inc."); 239 MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for 240 // the sake of this tag. It's Free Software. 241