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 103ced22070SDavid Woodhouse mutex_lock(&c->alloc_sem); 1041da177e4SLinus Torvalds jffs2_flush_wbuf_pad(c); 105ced22070SDavid Woodhouse mutex_unlock(&c->alloc_sem); 1061da177e4SLinus Torvalds return 0; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1095f556aabSDavid Woodhouse static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, 1105f556aabSDavid Woodhouse uint32_t generation) 1115f556aabSDavid Woodhouse { 1125f556aabSDavid Woodhouse /* We don't care about i_generation. We'll destroy the flash 1135f556aabSDavid Woodhouse before we start re-using inode numbers anyway. And even 1145f556aabSDavid Woodhouse if that wasn't true, we'd have other problems...*/ 1155f556aabSDavid Woodhouse return jffs2_iget(sb, ino); 1165f556aabSDavid Woodhouse } 1175f556aabSDavid Woodhouse 1185f556aabSDavid Woodhouse static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, 1195f556aabSDavid Woodhouse int fh_len, int fh_type) 1205f556aabSDavid Woodhouse { 1215f556aabSDavid Woodhouse return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1225f556aabSDavid Woodhouse jffs2_nfs_get_inode); 1235f556aabSDavid Woodhouse } 1245f556aabSDavid Woodhouse 1255f556aabSDavid Woodhouse static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, 1265f556aabSDavid Woodhouse int fh_len, int fh_type) 1275f556aabSDavid Woodhouse { 1285f556aabSDavid Woodhouse return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1295f556aabSDavid Woodhouse jffs2_nfs_get_inode); 1305f556aabSDavid Woodhouse } 1315f556aabSDavid Woodhouse 1325f556aabSDavid Woodhouse static struct dentry *jffs2_get_parent(struct dentry *child) 1335f556aabSDavid Woodhouse { 1345f556aabSDavid Woodhouse struct jffs2_inode_info *f; 1355f556aabSDavid Woodhouse uint32_t pino; 1365f556aabSDavid Woodhouse 1375f556aabSDavid Woodhouse BUG_ON(!S_ISDIR(child->d_inode->i_mode)); 1385f556aabSDavid Woodhouse 1395f556aabSDavid Woodhouse f = JFFS2_INODE_INFO(child->d_inode); 1405f556aabSDavid Woodhouse 1415f556aabSDavid Woodhouse pino = f->inocache->pino_nlink; 1425f556aabSDavid Woodhouse 1435f556aabSDavid Woodhouse JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", 1445f556aabSDavid Woodhouse f->inocache->ino, pino); 1455f556aabSDavid Woodhouse 1465f556aabSDavid Woodhouse return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); 1475f556aabSDavid Woodhouse } 1485f556aabSDavid Woodhouse 149ac4cfdd6SAlexey Dobriyan static const struct export_operations jffs2_export_ops = { 1505f556aabSDavid Woodhouse .get_parent = jffs2_get_parent, 1515f556aabSDavid Woodhouse .fh_to_dentry = jffs2_fh_to_dentry, 1525f556aabSDavid Woodhouse .fh_to_parent = jffs2_fh_to_parent, 1535f556aabSDavid Woodhouse }; 1545f556aabSDavid Woodhouse 15592abc475SAndres Salomon /* 15692abc475SAndres Salomon * JFFS2 mount options. 15792abc475SAndres Salomon * 15892abc475SAndres Salomon * Opt_override_compr: override default compressor 1598da8ba2eSDaniel Drake * Opt_rp_size: size of reserved pool in KiB 16092abc475SAndres Salomon * Opt_err: just end of array marker 16192abc475SAndres Salomon */ 16292abc475SAndres Salomon enum { 16392abc475SAndres Salomon Opt_override_compr, 1648da8ba2eSDaniel Drake Opt_rp_size, 16592abc475SAndres Salomon Opt_err, 16692abc475SAndres Salomon }; 16792abc475SAndres Salomon 16892abc475SAndres Salomon static const match_table_t tokens = { 16992abc475SAndres Salomon {Opt_override_compr, "compr=%s"}, 1708da8ba2eSDaniel Drake {Opt_rp_size, "rp_size=%u"}, 17192abc475SAndres Salomon {Opt_err, NULL}, 17292abc475SAndres Salomon }; 17392abc475SAndres Salomon 17492abc475SAndres Salomon static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) 17592abc475SAndres Salomon { 17692abc475SAndres Salomon substring_t args[MAX_OPT_ARGS]; 17792abc475SAndres Salomon char *p, *name; 1788da8ba2eSDaniel Drake unsigned int opt; 17992abc475SAndres Salomon 18092abc475SAndres Salomon if (!data) 18192abc475SAndres Salomon return 0; 18292abc475SAndres Salomon 18392abc475SAndres Salomon while ((p = strsep(&data, ","))) { 18492abc475SAndres Salomon int token; 18592abc475SAndres Salomon 18692abc475SAndres Salomon if (!*p) 18792abc475SAndres Salomon continue; 18892abc475SAndres Salomon 18992abc475SAndres Salomon token = match_token(p, tokens, args); 19092abc475SAndres Salomon switch (token) { 19192abc475SAndres Salomon case Opt_override_compr: 19292abc475SAndres Salomon name = match_strdup(&args[0]); 19392abc475SAndres Salomon 19492abc475SAndres Salomon if (!name) 19592abc475SAndres Salomon return -ENOMEM; 196123005f3SAndres Salomon if (!strcmp(name, "none")) 19792abc475SAndres Salomon c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; 198123005f3SAndres Salomon #ifdef CONFIG_JFFS2_LZO 199123005f3SAndres Salomon else if (!strcmp(name, "lzo")) 200123005f3SAndres Salomon c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; 201123005f3SAndres Salomon #endif 202123005f3SAndres Salomon #ifdef CONFIG_JFFS2_ZLIB 203123005f3SAndres Salomon else if (!strcmp(name, "zlib")) 204123005f3SAndres Salomon c->mount_opts.compr = 205123005f3SAndres Salomon JFFS2_COMPR_MODE_FORCEZLIB; 206123005f3SAndres Salomon #endif 207123005f3SAndres Salomon else { 2085a528957SJoe Perches pr_err("Error: unknown compressor \"%s\"\n", 209123005f3SAndres Salomon name); 210123005f3SAndres Salomon kfree(name); 211123005f3SAndres Salomon return -EINVAL; 21292abc475SAndres Salomon } 21392abc475SAndres Salomon kfree(name); 214123005f3SAndres Salomon c->mount_opts.override_compr = true; 21592abc475SAndres Salomon break; 2168da8ba2eSDaniel Drake case Opt_rp_size: 2178da8ba2eSDaniel Drake if (match_int(&args[0], &opt)) 2188da8ba2eSDaniel Drake return -EINVAL; 2198da8ba2eSDaniel Drake opt *= 1024; 2208da8ba2eSDaniel Drake if (opt > c->mtd->size) { 2218da8ba2eSDaniel Drake pr_warn("Too large reserve pool specified, max " 2228da8ba2eSDaniel Drake "is %llu KB\n", c->mtd->size / 1024); 2238da8ba2eSDaniel Drake return -EINVAL; 2248da8ba2eSDaniel Drake } 2258da8ba2eSDaniel Drake c->mount_opts.rp_size = opt; 2268da8ba2eSDaniel Drake break; 22792abc475SAndres Salomon default: 2285a528957SJoe Perches pr_err("Error: unrecognized mount option '%s' or missing value\n", 22992abc475SAndres Salomon p); 23092abc475SAndres Salomon return -EINVAL; 23192abc475SAndres Salomon } 23292abc475SAndres Salomon } 23392abc475SAndres Salomon 23492abc475SAndres Salomon return 0; 23592abc475SAndres Salomon } 23692abc475SAndres Salomon 23792abc475SAndres Salomon static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) 23892abc475SAndres Salomon { 23992abc475SAndres Salomon struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 24092abc475SAndres Salomon int err; 24192abc475SAndres Salomon 24292abc475SAndres Salomon err = jffs2_parse_options(c, data); 24392abc475SAndres Salomon if (err) 24492abc475SAndres Salomon return -EINVAL; 24592abc475SAndres Salomon 24692abc475SAndres Salomon return jffs2_do_remount_fs(sb, flags, data); 24792abc475SAndres Salomon } 24892abc475SAndres Salomon 249ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations jffs2_super_operations = 2501da177e4SLinus Torvalds { 2511da177e4SLinus Torvalds .alloc_inode = jffs2_alloc_inode, 2521da177e4SLinus Torvalds .destroy_inode =jffs2_destroy_inode, 2531da177e4SLinus Torvalds .put_super = jffs2_put_super, 2541da177e4SLinus Torvalds .statfs = jffs2_statfs, 2551da177e4SLinus Torvalds .remount_fs = jffs2_remount_fs, 256b57922d9SAl Viro .evict_inode = jffs2_evict_inode, 2571da177e4SLinus Torvalds .dirty_inode = jffs2_dirty_inode, 25892abc475SAndres Salomon .show_options = jffs2_show_options, 2591da177e4SLinus Torvalds .sync_fs = jffs2_sync_fs, 2601da177e4SLinus Torvalds }; 2611da177e4SLinus Torvalds 262acaebfd8SDavid Howells /* 263acaebfd8SDavid Howells * fill in the superblock 264acaebfd8SDavid Howells */ 265acaebfd8SDavid Howells static int jffs2_fill_super(struct super_block *sb, void *data, int silent) 2661da177e4SLinus Torvalds { 2671da177e4SLinus Torvalds struct jffs2_sb_info *c; 268db719222SJan Blunck int ret; 269db719222SJan Blunck 2709c261b33SJoe Perches jffs2_dbg(1, "jffs2_get_sb_mtd():" 271acaebfd8SDavid Howells " New superblock for device %d (\"%s\")\n", 2729c261b33SJoe Perches sb->s_mtd->index, sb->s_mtd->name); 2731da177e4SLinus Torvalds 274f8314dc6SPanagiotis Issaris c = kzalloc(sizeof(*c), GFP_KERNEL); 2751a028dd2SArnd Bergmann if (!c) 276454e2398SDavid Howells return -ENOMEM; 2771da177e4SLinus Torvalds 278acaebfd8SDavid Howells c->mtd = sb->s_mtd; 279acaebfd8SDavid Howells c->os_priv = sb; 280acaebfd8SDavid Howells sb->s_fs_info = c; 2811da177e4SLinus Torvalds 28292abc475SAndres Salomon ret = jffs2_parse_options(c, data); 28392abc475SAndres Salomon if (ret) { 28492abc475SAndres Salomon kfree(c); 28592abc475SAndres Salomon return -EINVAL; 28692abc475SAndres Salomon } 28792abc475SAndres Salomon 288acaebfd8SDavid Howells /* Initialize JFFS2 superblock locks, the further initialization will 289acaebfd8SDavid Howells * be done later */ 290ced22070SDavid Woodhouse mutex_init(&c->alloc_sem); 291ced22070SDavid Woodhouse mutex_init(&c->erase_free_sem); 292b6220598SArtem B. Bityuckiy init_waitqueue_head(&c->erase_wait); 293b6220598SArtem B. Bityuckiy init_waitqueue_head(&c->inocache_wq); 294b6220598SArtem B. Bityuckiy spin_lock_init(&c->erase_completion_lock); 295b6220598SArtem B. Bityuckiy spin_lock_init(&c->inocache_lock); 296b6220598SArtem B. Bityuckiy 2971da177e4SLinus Torvalds sb->s_op = &jffs2_super_operations; 2985f556aabSDavid Woodhouse sb->s_export_op = &jffs2_export_ops; 299acaebfd8SDavid Howells sb->s_flags = sb->s_flags | MS_NOATIME; 300aa98d7cfSKaiGai Kohei sb->s_xattr = jffs2_xattr_handlers; 301aa98d7cfSKaiGai Kohei #ifdef CONFIG_JFFS2_FS_POSIX_ACL 302aa98d7cfSKaiGai Kohei sb->s_flags |= MS_POSIXACL; 303aa98d7cfSKaiGai Kohei #endif 304db719222SJan Blunck ret = jffs2_do_fill_super(sb, data, silent); 305db719222SJan Blunck return ret; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 308848b83a5SAl Viro static struct dentry *jffs2_mount(struct file_system_type *fs_type, 3091da177e4SLinus Torvalds int flags, const char *dev_name, 310848b83a5SAl Viro void *data) 3111da177e4SLinus Torvalds { 312848b83a5SAl Viro return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds static void jffs2_put_super (struct super_block *sb) 3161da177e4SLinus Torvalds { 3171da177e4SLinus Torvalds struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 3181da177e4SLinus Torvalds 3199c261b33SJoe Perches jffs2_dbg(2, "%s()\n", __func__); 3201da177e4SLinus Torvalds 321ced22070SDavid Woodhouse mutex_lock(&c->alloc_sem); 3221da177e4SLinus Torvalds jffs2_flush_wbuf_pad(c); 323ced22070SDavid Woodhouse mutex_unlock(&c->alloc_sem); 324e631ddbaSFerenc Havasi 325e631ddbaSFerenc Havasi jffs2_sum_exit(c); 326e631ddbaSFerenc Havasi 3271da177e4SLinus Torvalds jffs2_free_ino_caches(c); 3281da177e4SLinus Torvalds jffs2_free_raw_node_refs(c); 3294ce1f562SFerenc Havasi if (jffs2_blocks_use_vmalloc(c)) 3301da177e4SLinus Torvalds vfree(c->blocks); 3311da177e4SLinus Torvalds else 3321da177e4SLinus Torvalds kfree(c->blocks); 3331da177e4SLinus Torvalds jffs2_flash_cleanup(c); 3341da177e4SLinus Torvalds kfree(c->inocache_list); 335aa98d7cfSKaiGai Kohei jffs2_clear_xattr_subsystem(c); 33685f2f2a8SArtem Bityutskiy mtd_sync(c->mtd); 3379c261b33SJoe Perches jffs2_dbg(1, "%s(): returning\n", __func__); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds static void jffs2_kill_sb(struct super_block *sb) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); 343a69dde91SArtem B. Bityuckiy if (!(sb->s_flags & MS_RDONLY)) 344a69dde91SArtem B. Bityuckiy jffs2_stop_garbage_collect_thread(c); 345acaebfd8SDavid Howells kill_mtd_super(sb); 3461da177e4SLinus Torvalds kfree(c); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds static struct file_system_type jffs2_fs_type = { 3501da177e4SLinus Torvalds .owner = THIS_MODULE, 3511da177e4SLinus Torvalds .name = "jffs2", 352848b83a5SAl Viro .mount = jffs2_mount, 3531da177e4SLinus Torvalds .kill_sb = jffs2_kill_sb, 3541da177e4SLinus Torvalds }; 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds static int __init init_jffs2_fs(void) 3571da177e4SLinus Torvalds { 3581da177e4SLinus Torvalds int ret; 3591da177e4SLinus Torvalds 3603e68fbb5SDavid Woodhouse /* Paranoia checks for on-medium structures. If we ask GCC 3613e68fbb5SDavid Woodhouse to pack them with __attribute__((packed)) then it _also_ 3623e68fbb5SDavid Woodhouse assumes that they're not aligned -- so it emits crappy 3633e68fbb5SDavid Woodhouse code on some architectures. Ideally we want an attribute 3643e68fbb5SDavid Woodhouse which means just 'no padding', without the alignment 3653e68fbb5SDavid Woodhouse thing. But GCC doesn't have that -- we have to just 3663e68fbb5SDavid Woodhouse hope the structs are the right sizes, instead. */ 3672ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); 3682ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); 3692ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); 3702ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); 3713e68fbb5SDavid Woodhouse 3725a528957SJoe Perches pr_info("version 2.2." 3732f82ce1eSAndrew Victor #ifdef CONFIG_JFFS2_FS_WRITEBUFFER 3741da177e4SLinus Torvalds " (NAND)" 3751da177e4SLinus Torvalds #endif 376e631ddbaSFerenc Havasi #ifdef CONFIG_JFFS2_SUMMARY 377e631ddbaSFerenc Havasi " (SUMMARY) " 378e631ddbaSFerenc Havasi #endif 379c00c310eSDavid Woodhouse " © 2001-2006 Red Hat, Inc.\n"); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds jffs2_inode_cachep = kmem_cache_create("jffs2_i", 3821da177e4SLinus Torvalds sizeof(struct jffs2_inode_info), 383fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 384fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 38520c2df83SPaul Mundt jffs2_i_init_once); 3861da177e4SLinus Torvalds if (!jffs2_inode_cachep) { 3875a528957SJoe Perches pr_err("error: Failed to initialise inode cache\n"); 3881da177e4SLinus Torvalds return -ENOMEM; 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds ret = jffs2_compressors_init(); 3911da177e4SLinus Torvalds if (ret) { 3925a528957SJoe Perches pr_err("error: Failed to initialise compressors\n"); 3931da177e4SLinus Torvalds goto out; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds ret = jffs2_create_slab_caches(); 3961da177e4SLinus Torvalds if (ret) { 3975a528957SJoe Perches pr_err("error: Failed to initialise slab caches\n"); 3981da177e4SLinus Torvalds goto out_compressors; 3991da177e4SLinus Torvalds } 4001da177e4SLinus Torvalds ret = register_filesystem(&jffs2_fs_type); 4011da177e4SLinus Torvalds if (ret) { 4025a528957SJoe Perches pr_err("error: Failed to register filesystem\n"); 4031da177e4SLinus Torvalds goto out_slab; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds return 0; 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds out_slab: 4081da177e4SLinus Torvalds jffs2_destroy_slab_caches(); 4091da177e4SLinus Torvalds out_compressors: 4101da177e4SLinus Torvalds jffs2_compressors_exit(); 4111da177e4SLinus Torvalds out: 4121da177e4SLinus Torvalds kmem_cache_destroy(jffs2_inode_cachep); 4131da177e4SLinus Torvalds return ret; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds static void __exit exit_jffs2_fs(void) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds unregister_filesystem(&jffs2_fs_type); 4191da177e4SLinus Torvalds jffs2_destroy_slab_caches(); 4201da177e4SLinus Torvalds jffs2_compressors_exit(); 4218c0a8537SKirill A. Shutemov 4228c0a8537SKirill A. Shutemov /* 4238c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 4248c0a8537SKirill A. Shutemov * destroy cache. 4258c0a8537SKirill A. Shutemov */ 4268c0a8537SKirill A. Shutemov rcu_barrier(); 4271da177e4SLinus Torvalds kmem_cache_destroy(jffs2_inode_cachep); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds module_init(init_jffs2_fs); 4311da177e4SLinus Torvalds module_exit(exit_jffs2_fs); 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds MODULE_DESCRIPTION("The Journalling Flash File System, v2"); 4341da177e4SLinus Torvalds MODULE_AUTHOR("Red Hat, Inc."); 4351da177e4SLinus Torvalds MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for 4361da177e4SLinus Torvalds // the sake of this tag. It's Free Software. 437