11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 4c00c310eSDavid Woodhouse * Copyright © 2001-2007 Red Hat, Inc. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Created by David Woodhouse <dwmw2@infradead.org> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * For licensing information, see the file 'LICENCE' in this directory. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 125a528957SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 135a528957SJoe Perches 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/module.h> 161da177e4SLinus Torvalds #include <linux/slab.h> 171da177e4SLinus Torvalds #include <linux/init.h> 181da177e4SLinus Torvalds #include <linux/list.h> 191da177e4SLinus Torvalds #include <linux/fs.h> 209c74034fSArtem Bityutskiy #include <linux/err.h> 211da177e4SLinus Torvalds #include <linux/mount.h> 2292abc475SAndres Salomon #include <linux/parser.h> 231da177e4SLinus Torvalds #include <linux/jffs2.h> 241da177e4SLinus Torvalds #include <linux/pagemap.h> 25acaebfd8SDavid Howells #include <linux/mtd/super.h> 261da177e4SLinus Torvalds #include <linux/ctype.h> 271da177e4SLinus Torvalds #include <linux/namei.h> 2892abc475SAndres Salomon #include <linux/seq_file.h> 295f556aabSDavid Woodhouse #include <linux/exportfs.h> 301da177e4SLinus Torvalds #include "compr.h" 311da177e4SLinus Torvalds #include "nodelist.h" 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds static void jffs2_put_super(struct super_block *); 341da177e4SLinus Torvalds 35e18b890bSChristoph Lameter static struct kmem_cache *jffs2_inode_cachep; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds static struct inode *jffs2_alloc_inode(struct super_block *sb) 381da177e4SLinus Torvalds { 394e571abaSDavid Woodhouse struct jffs2_inode_info *f; 404e571abaSDavid Woodhouse 414e571abaSDavid Woodhouse f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); 424e571abaSDavid Woodhouse if (!f) 431da177e4SLinus Torvalds return NULL; 444e571abaSDavid Woodhouse return &f->vfs_inode; 451da177e4SLinus Torvalds } 461da177e4SLinus Torvalds 47fa0d7e3dSNick Piggin static void jffs2_i_callback(struct rcu_head *head) 48fa0d7e3dSNick Piggin { 49fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 50fa0d7e3dSNick Piggin kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); 51fa0d7e3dSNick Piggin } 52fa0d7e3dSNick Piggin 531da177e4SLinus Torvalds static void jffs2_destroy_inode(struct inode *inode) 541da177e4SLinus Torvalds { 55fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, jffs2_i_callback); 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds 5851cc5068SAlexey Dobriyan static void jffs2_i_init_once(void *foo) 591da177e4SLinus Torvalds { 604e571abaSDavid Woodhouse struct jffs2_inode_info *f = foo; 611da177e4SLinus Torvalds 624e571abaSDavid Woodhouse mutex_init(&f->sem); 634e571abaSDavid Woodhouse inode_init_once(&f->vfs_inode); 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds 6692abc475SAndres Salomon static const char *jffs2_compr_name(unsigned int compr) 6792abc475SAndres Salomon { 6892abc475SAndres Salomon switch (compr) { 6992abc475SAndres Salomon case JFFS2_COMPR_MODE_NONE: 7092abc475SAndres Salomon return "none"; 71123005f3SAndres Salomon #ifdef CONFIG_JFFS2_LZO 72123005f3SAndres Salomon case JFFS2_COMPR_MODE_FORCELZO: 73123005f3SAndres Salomon return "lzo"; 74123005f3SAndres Salomon #endif 75123005f3SAndres Salomon #ifdef CONFIG_JFFS2_ZLIB 76123005f3SAndres Salomon case JFFS2_COMPR_MODE_FORCEZLIB: 77123005f3SAndres Salomon return "zlib"; 78123005f3SAndres Salomon #endif 7992abc475SAndres Salomon default: 8092abc475SAndres Salomon /* should never happen; programmer error */ 8192abc475SAndres Salomon WARN_ON(1); 8292abc475SAndres Salomon return ""; 8392abc475SAndres Salomon } 8492abc475SAndres Salomon } 8592abc475SAndres Salomon 8634c80b1dSAl Viro static int jffs2_show_options(struct seq_file *s, struct dentry *root) 8792abc475SAndres Salomon { 8834c80b1dSAl Viro struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb); 8992abc475SAndres Salomon struct jffs2_mount_opts *opts = &c->mount_opts; 9092abc475SAndres Salomon 9192abc475SAndres Salomon if (opts->override_compr) 9292abc475SAndres Salomon seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr)); 938da8ba2eSDaniel Drake if (opts->rp_size) 948da8ba2eSDaniel Drake seq_printf(s, ",rp_size=%u", opts->rp_size / 1024); 9592abc475SAndres Salomon 9692abc475SAndres Salomon return 0; 9792abc475SAndres Salomon } 9892abc475SAndres Salomon 991da177e4SLinus Torvalds static int jffs2_sync_fs(struct super_block *sb, int wait) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 1021da177e4SLinus Torvalds 103a445f784SArtem Bityutskiy #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 104a788c527SDaniel Santos if (jffs2_is_writebuffered(c)) 105a445f784SArtem Bityutskiy cancel_delayed_work_sync(&c->wbuf_dwork); 106a445f784SArtem Bityutskiy #endif 107a445f784SArtem Bityutskiy 108ced22070SDavid Woodhouse mutex_lock(&c->alloc_sem); 1091da177e4SLinus Torvalds jffs2_flush_wbuf_pad(c); 110ced22070SDavid Woodhouse mutex_unlock(&c->alloc_sem); 1111da177e4SLinus Torvalds return 0; 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds 1145f556aabSDavid Woodhouse static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, 1155f556aabSDavid Woodhouse uint32_t generation) 1165f556aabSDavid Woodhouse { 1175f556aabSDavid Woodhouse /* We don't care about i_generation. We'll destroy the flash 1185f556aabSDavid Woodhouse before we start re-using inode numbers anyway. And even 1195f556aabSDavid Woodhouse if that wasn't true, we'd have other problems...*/ 1205f556aabSDavid Woodhouse return jffs2_iget(sb, ino); 1215f556aabSDavid Woodhouse } 1225f556aabSDavid Woodhouse 1235f556aabSDavid Woodhouse static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, 1245f556aabSDavid Woodhouse int fh_len, int fh_type) 1255f556aabSDavid Woodhouse { 1265f556aabSDavid Woodhouse return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1275f556aabSDavid Woodhouse jffs2_nfs_get_inode); 1285f556aabSDavid Woodhouse } 1295f556aabSDavid Woodhouse 1305f556aabSDavid Woodhouse static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, 1315f556aabSDavid Woodhouse int fh_len, int fh_type) 1325f556aabSDavid Woodhouse { 1335f556aabSDavid Woodhouse return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1345f556aabSDavid Woodhouse jffs2_nfs_get_inode); 1355f556aabSDavid Woodhouse } 1365f556aabSDavid Woodhouse 1375f556aabSDavid Woodhouse static struct dentry *jffs2_get_parent(struct dentry *child) 1385f556aabSDavid Woodhouse { 1395f556aabSDavid Woodhouse struct jffs2_inode_info *f; 1405f556aabSDavid Woodhouse uint32_t pino; 1415f556aabSDavid Woodhouse 142e36cb0b8SDavid Howells BUG_ON(!d_is_dir(child)); 1435f556aabSDavid Woodhouse 1442b0143b5SDavid Howells f = JFFS2_INODE_INFO(d_inode(child)); 1455f556aabSDavid Woodhouse 1465f556aabSDavid Woodhouse pino = f->inocache->pino_nlink; 1475f556aabSDavid Woodhouse 1485f556aabSDavid Woodhouse JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", 1495f556aabSDavid Woodhouse f->inocache->ino, pino); 1505f556aabSDavid Woodhouse 151fc64005cSAl Viro return d_obtain_alias(jffs2_iget(child->d_sb, pino)); 1525f556aabSDavid Woodhouse } 1535f556aabSDavid Woodhouse 154ac4cfdd6SAlexey Dobriyan static const struct export_operations jffs2_export_ops = { 1555f556aabSDavid Woodhouse .get_parent = jffs2_get_parent, 1565f556aabSDavid Woodhouse .fh_to_dentry = jffs2_fh_to_dentry, 1575f556aabSDavid Woodhouse .fh_to_parent = jffs2_fh_to_parent, 1585f556aabSDavid Woodhouse }; 1595f556aabSDavid Woodhouse 16092abc475SAndres Salomon /* 16192abc475SAndres Salomon * JFFS2 mount options. 16292abc475SAndres Salomon * 16392abc475SAndres Salomon * Opt_override_compr: override default compressor 1648da8ba2eSDaniel Drake * Opt_rp_size: size of reserved pool in KiB 16592abc475SAndres Salomon * Opt_err: just end of array marker 16692abc475SAndres Salomon */ 16792abc475SAndres Salomon enum { 16892abc475SAndres Salomon Opt_override_compr, 1698da8ba2eSDaniel Drake Opt_rp_size, 17092abc475SAndres Salomon Opt_err, 17192abc475SAndres Salomon }; 17292abc475SAndres Salomon 17392abc475SAndres Salomon static const match_table_t tokens = { 17492abc475SAndres Salomon {Opt_override_compr, "compr=%s"}, 1758da8ba2eSDaniel Drake {Opt_rp_size, "rp_size=%u"}, 17692abc475SAndres Salomon {Opt_err, NULL}, 17792abc475SAndres Salomon }; 17892abc475SAndres Salomon 17992abc475SAndres Salomon static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) 18092abc475SAndres Salomon { 18192abc475SAndres Salomon substring_t args[MAX_OPT_ARGS]; 18292abc475SAndres Salomon char *p, *name; 1838da8ba2eSDaniel Drake unsigned int opt; 18492abc475SAndres Salomon 18592abc475SAndres Salomon if (!data) 18692abc475SAndres Salomon return 0; 18792abc475SAndres Salomon 18892abc475SAndres Salomon while ((p = strsep(&data, ","))) { 18992abc475SAndres Salomon int token; 19092abc475SAndres Salomon 19192abc475SAndres Salomon if (!*p) 19292abc475SAndres Salomon continue; 19392abc475SAndres Salomon 19492abc475SAndres Salomon token = match_token(p, tokens, args); 19592abc475SAndres Salomon switch (token) { 19692abc475SAndres Salomon case Opt_override_compr: 19792abc475SAndres Salomon name = match_strdup(&args[0]); 19892abc475SAndres Salomon 19992abc475SAndres Salomon if (!name) 20092abc475SAndres Salomon return -ENOMEM; 201123005f3SAndres Salomon if (!strcmp(name, "none")) 20292abc475SAndres Salomon c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; 203123005f3SAndres Salomon #ifdef CONFIG_JFFS2_LZO 204123005f3SAndres Salomon else if (!strcmp(name, "lzo")) 205123005f3SAndres Salomon c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; 206123005f3SAndres Salomon #endif 207123005f3SAndres Salomon #ifdef CONFIG_JFFS2_ZLIB 208123005f3SAndres Salomon else if (!strcmp(name, "zlib")) 209123005f3SAndres Salomon c->mount_opts.compr = 210123005f3SAndres Salomon JFFS2_COMPR_MODE_FORCEZLIB; 211123005f3SAndres Salomon #endif 212123005f3SAndres Salomon else { 2135a528957SJoe Perches pr_err("Error: unknown compressor \"%s\"\n", 214123005f3SAndres Salomon name); 215123005f3SAndres Salomon kfree(name); 216123005f3SAndres Salomon return -EINVAL; 21792abc475SAndres Salomon } 21892abc475SAndres Salomon kfree(name); 219123005f3SAndres Salomon c->mount_opts.override_compr = true; 22092abc475SAndres Salomon break; 2218da8ba2eSDaniel Drake case Opt_rp_size: 2228da8ba2eSDaniel Drake if (match_int(&args[0], &opt)) 2238da8ba2eSDaniel Drake return -EINVAL; 2248da8ba2eSDaniel Drake opt *= 1024; 2258da8ba2eSDaniel Drake if (opt > c->mtd->size) { 2268da8ba2eSDaniel Drake pr_warn("Too large reserve pool specified, max " 2278da8ba2eSDaniel Drake "is %llu KB\n", c->mtd->size / 1024); 2288da8ba2eSDaniel Drake return -EINVAL; 2298da8ba2eSDaniel Drake } 2308da8ba2eSDaniel Drake c->mount_opts.rp_size = opt; 2318da8ba2eSDaniel Drake break; 23292abc475SAndres Salomon default: 2335a528957SJoe Perches pr_err("Error: unrecognized mount option '%s' or missing value\n", 23492abc475SAndres Salomon p); 23592abc475SAndres Salomon return -EINVAL; 23692abc475SAndres Salomon } 23792abc475SAndres Salomon } 23892abc475SAndres Salomon 23992abc475SAndres Salomon return 0; 24092abc475SAndres Salomon } 24192abc475SAndres Salomon 24292abc475SAndres Salomon static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) 24392abc475SAndres Salomon { 24492abc475SAndres Salomon struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 24592abc475SAndres Salomon int err; 24692abc475SAndres Salomon 24702b9984dSTheodore Ts'o sync_filesystem(sb); 24892abc475SAndres Salomon err = jffs2_parse_options(c, data); 24992abc475SAndres Salomon if (err) 25092abc475SAndres Salomon return -EINVAL; 25192abc475SAndres Salomon 25292abc475SAndres Salomon return jffs2_do_remount_fs(sb, flags, data); 25392abc475SAndres Salomon } 25492abc475SAndres Salomon 255ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations jffs2_super_operations = 2561da177e4SLinus Torvalds { 2571da177e4SLinus Torvalds .alloc_inode = jffs2_alloc_inode, 2581da177e4SLinus Torvalds .destroy_inode =jffs2_destroy_inode, 2591da177e4SLinus Torvalds .put_super = jffs2_put_super, 2601da177e4SLinus Torvalds .statfs = jffs2_statfs, 2611da177e4SLinus Torvalds .remount_fs = jffs2_remount_fs, 262b57922d9SAl Viro .evict_inode = jffs2_evict_inode, 2631da177e4SLinus Torvalds .dirty_inode = jffs2_dirty_inode, 26492abc475SAndres Salomon .show_options = jffs2_show_options, 2651da177e4SLinus Torvalds .sync_fs = jffs2_sync_fs, 2661da177e4SLinus Torvalds }; 2671da177e4SLinus Torvalds 268acaebfd8SDavid Howells /* 269acaebfd8SDavid Howells * fill in the superblock 270acaebfd8SDavid Howells */ 271acaebfd8SDavid Howells static int jffs2_fill_super(struct super_block *sb, void *data, int silent) 2721da177e4SLinus Torvalds { 2731da177e4SLinus Torvalds struct jffs2_sb_info *c; 274db719222SJan Blunck int ret; 275db719222SJan Blunck 2769c261b33SJoe Perches jffs2_dbg(1, "jffs2_get_sb_mtd():" 277acaebfd8SDavid Howells " New superblock for device %d (\"%s\")\n", 2789c261b33SJoe Perches sb->s_mtd->index, sb->s_mtd->name); 2791da177e4SLinus Torvalds 280f8314dc6SPanagiotis Issaris c = kzalloc(sizeof(*c), GFP_KERNEL); 2811a028dd2SArnd Bergmann if (!c) 282454e2398SDavid Howells return -ENOMEM; 2831da177e4SLinus Torvalds 284acaebfd8SDavid Howells c->mtd = sb->s_mtd; 285acaebfd8SDavid Howells c->os_priv = sb; 286acaebfd8SDavid Howells sb->s_fs_info = c; 2871da177e4SLinus Torvalds 28892abc475SAndres Salomon ret = jffs2_parse_options(c, data); 28992e2921fSHou Tao if (ret) 29092abc475SAndres Salomon return -EINVAL; 29192abc475SAndres Salomon 292acaebfd8SDavid Howells /* Initialize JFFS2 superblock locks, the further initialization will 293acaebfd8SDavid Howells * be done later */ 294ced22070SDavid Woodhouse mutex_init(&c->alloc_sem); 295ced22070SDavid Woodhouse mutex_init(&c->erase_free_sem); 296b6220598SArtem B. Bityuckiy init_waitqueue_head(&c->erase_wait); 297b6220598SArtem B. Bityuckiy init_waitqueue_head(&c->inocache_wq); 298b6220598SArtem B. Bityuckiy spin_lock_init(&c->erase_completion_lock); 299b6220598SArtem B. Bityuckiy spin_lock_init(&c->inocache_lock); 300b6220598SArtem B. Bityuckiy 3011da177e4SLinus Torvalds sb->s_op = &jffs2_super_operations; 3025f556aabSDavid Woodhouse sb->s_export_op = &jffs2_export_ops; 3031751e8a6SLinus Torvalds sb->s_flags = sb->s_flags | SB_NOATIME; 304aa98d7cfSKaiGai Kohei sb->s_xattr = jffs2_xattr_handlers; 305aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 3061751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 307aa98d7cfSKaiGai Kohei #endif 308db719222SJan Blunck ret = jffs2_do_fill_super(sb, data, silent); 309db719222SJan Blunck return ret; 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 312848b83a5SAl Viro static struct dentry *jffs2_mount(struct file_system_type *fs_type, 3131da177e4SLinus Torvalds int flags, const char *dev_name, 314848b83a5SAl Viro void *data) 3151da177e4SLinus Torvalds { 316848b83a5SAl Viro return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds static void jffs2_put_super (struct super_block *sb) 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 3221da177e4SLinus Torvalds 3239c261b33SJoe Perches jffs2_dbg(2, "%s()\n", __func__); 3241da177e4SLinus Torvalds 325ced22070SDavid Woodhouse mutex_lock(&c->alloc_sem); 3261da177e4SLinus Torvalds jffs2_flush_wbuf_pad(c); 327ced22070SDavid Woodhouse mutex_unlock(&c->alloc_sem); 328e631ddbaSFerenc Havasi 329e631ddbaSFerenc Havasi jffs2_sum_exit(c); 330e631ddbaSFerenc Havasi 3311da177e4SLinus Torvalds jffs2_free_ino_caches(c); 3321da177e4SLinus Torvalds jffs2_free_raw_node_refs(c); 3331d5cfdb0STetsuo Handa kvfree(c->blocks); 3341da177e4SLinus Torvalds jffs2_flash_cleanup(c); 3351da177e4SLinus Torvalds kfree(c->inocache_list); 336aa98d7cfSKaiGai Kohei jffs2_clear_xattr_subsystem(c); 33785f2f2a8SArtem Bityutskiy mtd_sync(c->mtd); 3389c261b33SJoe Perches jffs2_dbg(1, "%s(): returning\n", __func__); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds static void jffs2_kill_sb(struct super_block *sb) 3421da177e4SLinus Torvalds { 3431da177e4SLinus Torvalds struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 344c66b23c2SAl Viro if (c && !sb_rdonly(sb)) 345a69dde91SArtem B. Bityuckiy jffs2_stop_garbage_collect_thread(c); 346acaebfd8SDavid Howells kill_mtd_super(sb); 3471da177e4SLinus Torvalds kfree(c); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds static struct file_system_type jffs2_fs_type = { 3511da177e4SLinus Torvalds .owner = THIS_MODULE, 3521da177e4SLinus Torvalds .name = "jffs2", 353848b83a5SAl Viro .mount = jffs2_mount, 3541da177e4SLinus Torvalds .kill_sb = jffs2_kill_sb, 3551da177e4SLinus Torvalds }; 3567f78e035SEric W. Biederman MODULE_ALIAS_FS("jffs2"); 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds static int __init init_jffs2_fs(void) 3591da177e4SLinus Torvalds { 3601da177e4SLinus Torvalds int ret; 3611da177e4SLinus Torvalds 3623e68fbb5SDavid Woodhouse /* Paranoia checks for on-medium structures. If we ask GCC 3633e68fbb5SDavid Woodhouse to pack them with __attribute__((packed)) then it _also_ 3643e68fbb5SDavid Woodhouse assumes that they're not aligned -- so it emits crappy 3653e68fbb5SDavid Woodhouse code on some architectures. Ideally we want an attribute 3663e68fbb5SDavid Woodhouse which means just 'no padding', without the alignment 3673e68fbb5SDavid Woodhouse thing. But GCC doesn't have that -- we have to just 3683e68fbb5SDavid Woodhouse hope the structs are the right sizes, instead. */ 3692ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); 3702ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); 3712ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); 3722ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); 3733e68fbb5SDavid Woodhouse 3745a528957SJoe Perches pr_info("version 2.2." 3752f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 3761da177e4SLinus Torvalds " (NAND)" 3771da177e4SLinus Torvalds #endif 378e631ddbaSFerenc Havasi #ifdef CONFIG_JFFS2_SUMMARY 379e631ddbaSFerenc Havasi " (SUMMARY) " 380e631ddbaSFerenc Havasi #endif 381c00c310eSDavid Woodhouse " © 2001-2006 Red Hat, Inc.\n"); 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds jffs2_inode_cachep = kmem_cache_create("jffs2_i", 3841da177e4SLinus Torvalds sizeof(struct jffs2_inode_info), 385fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 3865d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 38720c2df83SPaul Mundt jffs2_i_init_once); 3881da177e4SLinus Torvalds if (!jffs2_inode_cachep) { 3895a528957SJoe Perches pr_err("error: Failed to initialise inode cache\n"); 3901da177e4SLinus Torvalds return -ENOMEM; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds ret = jffs2_compressors_init(); 3931da177e4SLinus Torvalds if (ret) { 3945a528957SJoe Perches pr_err("error: Failed to initialise compressors\n"); 3951da177e4SLinus Torvalds goto out; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds ret = jffs2_create_slab_caches(); 3981da177e4SLinus Torvalds if (ret) { 3995a528957SJoe Perches pr_err("error: Failed to initialise slab caches\n"); 4001da177e4SLinus Torvalds goto out_compressors; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds ret = register_filesystem(&jffs2_fs_type); 4031da177e4SLinus Torvalds if (ret) { 4045a528957SJoe Perches pr_err("error: Failed to register filesystem\n"); 4051da177e4SLinus Torvalds goto out_slab; 4061da177e4SLinus Torvalds } 4071da177e4SLinus Torvalds return 0; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds out_slab: 4101da177e4SLinus Torvalds jffs2_destroy_slab_caches(); 4111da177e4SLinus Torvalds out_compressors: 4121da177e4SLinus Torvalds jffs2_compressors_exit(); 4131da177e4SLinus Torvalds out: 4141da177e4SLinus Torvalds kmem_cache_destroy(jffs2_inode_cachep); 4151da177e4SLinus Torvalds return ret; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds static void __exit exit_jffs2_fs(void) 4191da177e4SLinus Torvalds { 4201da177e4SLinus Torvalds unregister_filesystem(&jffs2_fs_type); 4211da177e4SLinus Torvalds jffs2_destroy_slab_caches(); 4221da177e4SLinus Torvalds jffs2_compressors_exit(); 4238c0a8537SKirill A. Shutemov 4248c0a8537SKirill A. Shutemov /* 4258c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 4268c0a8537SKirill A. Shutemov * destroy cache. 4278c0a8537SKirill A. Shutemov */ 4288c0a8537SKirill A. Shutemov rcu_barrier(); 4291da177e4SLinus Torvalds kmem_cache_destroy(jffs2_inode_cachep); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds module_init(init_jffs2_fs); 4331da177e4SLinus Torvalds module_exit(exit_jffs2_fs); 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds MODULE_DESCRIPTION("The Journalling Flash File System, v2"); 4361da177e4SLinus Torvalds MODULE_AUTHOR("Red Hat, Inc."); 4371da177e4SLinus Torvalds MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for 4381da177e4SLinus Torvalds // the sake of this tag. It's Free Software. 439