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 | |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/fs.h> |
Artem Bityutskiy | 9c74034 | 2006-10-11 14:52:47 +0300 | [diff] [blame] | 20 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/mount.h> |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 22 | #include <linux/parser.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/jffs2.h> |
| 24 | #include <linux/pagemap.h> |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 25 | #include <linux/mtd/super.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/ctype.h> |
| 27 | #include <linux/namei.h> |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 28 | #include <linux/seq_file.h> |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 29 | #include <linux/exportfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "compr.h" |
| 31 | #include "nodelist.h" |
| 32 | |
| 33 | static void jffs2_put_super(struct super_block *); |
| 34 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 35 | static struct kmem_cache *jffs2_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | static struct inode *jffs2_alloc_inode(struct super_block *sb) |
| 38 | { |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 39 | struct jffs2_inode_info *f; |
| 40 | |
| 41 | f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL); |
| 42 | if (!f) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | return NULL; |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 44 | return &f->vfs_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | } |
| 46 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 47 | static void jffs2_i_callback(struct rcu_head *head) |
| 48 | { |
| 49 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 50 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); |
| 51 | } |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | static void jffs2_destroy_inode(struct inode *inode) |
| 54 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 55 | call_rcu(&inode->i_rcu, jffs2_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | } |
| 57 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 58 | static void jffs2_i_init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 60 | struct jffs2_inode_info *f = foo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
David Woodhouse | 4e571ab | 2008-05-01 12:28:04 +0100 | [diff] [blame] | 62 | mutex_init(&f->sem); |
| 63 | inode_init_once(&f->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | } |
| 65 | |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 66 | static const char *jffs2_compr_name(unsigned int compr) |
| 67 | { |
| 68 | switch (compr) { |
| 69 | case JFFS2_COMPR_MODE_NONE: |
| 70 | return "none"; |
Andres Salomon | 123005f | 2011-10-16 18:15:23 -0700 | [diff] [blame] | 71 | #ifdef CONFIG_JFFS2_LZO |
| 72 | case JFFS2_COMPR_MODE_FORCELZO: |
| 73 | return "lzo"; |
| 74 | #endif |
| 75 | #ifdef CONFIG_JFFS2_ZLIB |
| 76 | case JFFS2_COMPR_MODE_FORCEZLIB: |
| 77 | return "zlib"; |
| 78 | #endif |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 79 | default: |
| 80 | /* should never happen; programmer error */ |
| 81 | WARN_ON(1); |
| 82 | return ""; |
| 83 | } |
| 84 | } |
| 85 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 86 | static int jffs2_show_options(struct seq_file *s, struct dentry *root) |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 87 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 88 | struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb); |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 89 | struct jffs2_mount_opts *opts = &c->mount_opts; |
| 90 | |
| 91 | if (opts->override_compr) |
| 92 | seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr)); |
Daniel Drake | 8da8ba2 | 2012-04-10 22:22:35 +0100 | [diff] [blame] | 93 | if (opts->rp_size) |
| 94 | seq_printf(s, ",rp_size=%u", opts->rp_size / 1024); |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | static int jffs2_sync_fs(struct super_block *sb, int wait) |
| 100 | { |
| 101 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| 102 | |
Artem Bityutskiy | a445f78 | 2012-08-23 10:10:07 +0300 | [diff] [blame] | 103 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
| 104 | cancel_delayed_work_sync(&c->wbuf_dwork); |
| 105 | #endif |
| 106 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 107 | mutex_lock(&c->alloc_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | jffs2_flush_wbuf_pad(c); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 109 | mutex_unlock(&c->alloc_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return 0; |
| 111 | } |
| 112 | |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 113 | static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
| 114 | uint32_t generation) |
| 115 | { |
| 116 | /* We don't care about i_generation. We'll destroy the flash |
| 117 | before we start re-using inode numbers anyway. And even |
| 118 | if that wasn't true, we'd have other problems...*/ |
| 119 | return jffs2_iget(sb, ino); |
| 120 | } |
| 121 | |
| 122 | static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 123 | int fh_len, int fh_type) |
| 124 | { |
| 125 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 126 | jffs2_nfs_get_inode); |
| 127 | } |
| 128 | |
| 129 | static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 130 | int fh_len, int fh_type) |
| 131 | { |
| 132 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 133 | jffs2_nfs_get_inode); |
| 134 | } |
| 135 | |
| 136 | static struct dentry *jffs2_get_parent(struct dentry *child) |
| 137 | { |
| 138 | struct jffs2_inode_info *f; |
| 139 | uint32_t pino; |
| 140 | |
| 141 | BUG_ON(!S_ISDIR(child->d_inode->i_mode)); |
| 142 | |
| 143 | f = JFFS2_INODE_INFO(child->d_inode); |
| 144 | |
| 145 | pino = f->inocache->pino_nlink; |
| 146 | |
| 147 | JFFS2_DEBUG("Parent of directory ino #%u is #%u\n", |
| 148 | f->inocache->ino, pino); |
| 149 | |
| 150 | return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino)); |
| 151 | } |
| 152 | |
Alexey Dobriyan | ac4cfdd | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 153 | static const struct export_operations jffs2_export_ops = { |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 154 | .get_parent = jffs2_get_parent, |
| 155 | .fh_to_dentry = jffs2_fh_to_dentry, |
| 156 | .fh_to_parent = jffs2_fh_to_parent, |
| 157 | }; |
| 158 | |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 159 | /* |
| 160 | * JFFS2 mount options. |
| 161 | * |
| 162 | * Opt_override_compr: override default compressor |
Daniel Drake | 8da8ba2 | 2012-04-10 22:22:35 +0100 | [diff] [blame] | 163 | * Opt_rp_size: size of reserved pool in KiB |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 164 | * Opt_err: just end of array marker |
| 165 | */ |
| 166 | enum { |
| 167 | Opt_override_compr, |
Daniel Drake | 8da8ba2 | 2012-04-10 22:22:35 +0100 | [diff] [blame] | 168 | Opt_rp_size, |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 169 | Opt_err, |
| 170 | }; |
| 171 | |
| 172 | static const match_table_t tokens = { |
| 173 | {Opt_override_compr, "compr=%s"}, |
Daniel Drake | 8da8ba2 | 2012-04-10 22:22:35 +0100 | [diff] [blame] | 174 | {Opt_rp_size, "rp_size=%u"}, |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 175 | {Opt_err, NULL}, |
| 176 | }; |
| 177 | |
| 178 | static int jffs2_parse_options(struct jffs2_sb_info *c, char *data) |
| 179 | { |
| 180 | substring_t args[MAX_OPT_ARGS]; |
| 181 | char *p, *name; |
Daniel Drake | 8da8ba2 | 2012-04-10 22:22:35 +0100 | [diff] [blame] | 182 | unsigned int opt; |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 183 | |
| 184 | if (!data) |
| 185 | return 0; |
| 186 | |
| 187 | while ((p = strsep(&data, ","))) { |
| 188 | int token; |
| 189 | |
| 190 | if (!*p) |
| 191 | continue; |
| 192 | |
| 193 | token = match_token(p, tokens, args); |
| 194 | switch (token) { |
| 195 | case Opt_override_compr: |
| 196 | name = match_strdup(&args[0]); |
| 197 | |
| 198 | if (!name) |
| 199 | return -ENOMEM; |
Andres Salomon | 123005f | 2011-10-16 18:15:23 -0700 | [diff] [blame] | 200 | if (!strcmp(name, "none")) |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 201 | c->mount_opts.compr = JFFS2_COMPR_MODE_NONE; |
Andres Salomon | 123005f | 2011-10-16 18:15:23 -0700 | [diff] [blame] | 202 | #ifdef CONFIG_JFFS2_LZO |
| 203 | else if (!strcmp(name, "lzo")) |
| 204 | c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO; |
| 205 | #endif |
| 206 | #ifdef CONFIG_JFFS2_ZLIB |
| 207 | else if (!strcmp(name, "zlib")) |
| 208 | c->mount_opts.compr = |
| 209 | JFFS2_COMPR_MODE_FORCEZLIB; |
| 210 | #endif |
| 211 | else { |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 212 | pr_err("Error: unknown compressor \"%s\"\n", |
Joe Perches | da320f0 | 2012-02-15 15:56:44 -0800 | [diff] [blame] | 213 | name); |
Andres Salomon | 123005f | 2011-10-16 18:15:23 -0700 | [diff] [blame] | 214 | kfree(name); |
| 215 | return -EINVAL; |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 216 | } |
| 217 | kfree(name); |
Andres Salomon | 123005f | 2011-10-16 18:15:23 -0700 | [diff] [blame] | 218 | c->mount_opts.override_compr = true; |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 219 | break; |
Daniel Drake | 8da8ba2 | 2012-04-10 22:22:35 +0100 | [diff] [blame] | 220 | case Opt_rp_size: |
| 221 | if (match_int(&args[0], &opt)) |
| 222 | return -EINVAL; |
| 223 | opt *= 1024; |
| 224 | if (opt > c->mtd->size) { |
| 225 | pr_warn("Too large reserve pool specified, max " |
| 226 | "is %llu KB\n", c->mtd->size / 1024); |
| 227 | return -EINVAL; |
| 228 | } |
| 229 | c->mount_opts.rp_size = opt; |
| 230 | break; |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 231 | default: |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 232 | pr_err("Error: unrecognized mount option '%s' or missing value\n", |
Joe Perches | da320f0 | 2012-02-15 15:56:44 -0800 | [diff] [blame] | 233 | p); |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 234 | return -EINVAL; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data) |
| 242 | { |
| 243 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| 244 | int err; |
| 245 | |
| 246 | err = jffs2_parse_options(c, data); |
| 247 | if (err) |
| 248 | return -EINVAL; |
| 249 | |
| 250 | return jffs2_do_remount_fs(sb, flags, data); |
| 251 | } |
| 252 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 253 | static const struct super_operations jffs2_super_operations = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | { |
| 255 | .alloc_inode = jffs2_alloc_inode, |
| 256 | .destroy_inode =jffs2_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | .put_super = jffs2_put_super, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | .statfs = jffs2_statfs, |
| 259 | .remount_fs = jffs2_remount_fs, |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 260 | .evict_inode = jffs2_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | .dirty_inode = jffs2_dirty_inode, |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 262 | .show_options = jffs2_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | .sync_fs = jffs2_sync_fs, |
| 264 | }; |
| 265 | |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 266 | /* |
| 267 | * fill in the superblock |
| 268 | */ |
| 269 | 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] | 270 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | struct jffs2_sb_info *c; |
Jan Blunck | db71922 | 2010-08-15 22:51:10 +0200 | [diff] [blame] | 272 | int ret; |
| 273 | |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 274 | jffs2_dbg(1, "jffs2_get_sb_mtd():" |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 275 | " New superblock for device %d (\"%s\")\n", |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 276 | sb->s_mtd->index, sb->s_mtd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 278 | c = kzalloc(sizeof(*c), GFP_KERNEL); |
Arnd Bergmann | 1a028dd | 2010-09-16 16:11:09 +0200 | [diff] [blame] | 279 | if (!c) |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 280 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 282 | c->mtd = sb->s_mtd; |
| 283 | c->os_priv = sb; |
| 284 | sb->s_fs_info = c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
Andres Salomon | 92abc47 | 2011-10-16 18:15:16 -0700 | [diff] [blame] | 286 | ret = jffs2_parse_options(c, data); |
| 287 | if (ret) { |
| 288 | kfree(c); |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 292 | /* Initialize JFFS2 superblock locks, the further initialization will |
| 293 | * be done later */ |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 294 | mutex_init(&c->alloc_sem); |
| 295 | mutex_init(&c->erase_free_sem); |
Artem B. Bityuckiy | b622059 | 2005-07-12 17:37:12 +0100 | [diff] [blame] | 296 | init_waitqueue_head(&c->erase_wait); |
| 297 | init_waitqueue_head(&c->inocache_wq); |
| 298 | spin_lock_init(&c->erase_completion_lock); |
| 299 | spin_lock_init(&c->inocache_lock); |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | sb->s_op = &jffs2_super_operations; |
David Woodhouse | 5f556aa | 2008-07-31 20:39:25 +0100 | [diff] [blame] | 302 | sb->s_export_op = &jffs2_export_ops; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 303 | sb->s_flags = sb->s_flags | MS_NOATIME; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 304 | sb->s_xattr = jffs2_xattr_handlers; |
| 305 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL |
| 306 | sb->s_flags |= MS_POSIXACL; |
| 307 | #endif |
Jan Blunck | db71922 | 2010-08-15 22:51:10 +0200 | [diff] [blame] | 308 | ret = jffs2_do_fill_super(sb, data, silent); |
Jan Blunck | db71922 | 2010-08-15 22:51:10 +0200 | [diff] [blame] | 309 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Al Viro | 848b83a | 2010-07-25 00:56:46 +0400 | [diff] [blame] | 312 | static struct dentry *jffs2_mount(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 313 | int flags, const char *dev_name, |
Al Viro | 848b83a | 2010-07-25 00:56:46 +0400 | [diff] [blame] | 314 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | { |
Al Viro | 848b83a | 2010-07-25 00:56:46 +0400 | [diff] [blame] | 316 | return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | static void jffs2_put_super (struct super_block *sb) |
| 320 | { |
| 321 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
| 322 | |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 323 | jffs2_dbg(2, "%s()\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 325 | mutex_lock(&c->alloc_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | jffs2_flush_wbuf_pad(c); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 327 | mutex_unlock(&c->alloc_sem); |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 328 | |
| 329 | jffs2_sum_exit(c); |
| 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | jffs2_free_ino_caches(c); |
| 332 | jffs2_free_raw_node_refs(c); |
Ferenc Havasi | 4ce1f56 | 2005-08-31 14:51:04 +0100 | [diff] [blame] | 333 | if (jffs2_blocks_use_vmalloc(c)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | vfree(c->blocks); |
| 335 | else |
| 336 | kfree(c->blocks); |
| 337 | jffs2_flash_cleanup(c); |
| 338 | kfree(c->inocache_list); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 339 | jffs2_clear_xattr_subsystem(c); |
Artem Bityutskiy | 327cf29 | 2011-12-30 16:35:35 +0200 | [diff] [blame] | 340 | mtd_sync(c->mtd); |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 341 | jffs2_dbg(1, "%s(): returning\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | static void jffs2_kill_sb(struct super_block *sb) |
| 345 | { |
| 346 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
Artem B. Bityuckiy | a69dde9 | 2005-05-18 12:37:28 +0100 | [diff] [blame] | 347 | if (!(sb->s_flags & MS_RDONLY)) |
| 348 | jffs2_stop_garbage_collect_thread(c); |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 349 | kill_mtd_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | kfree(c); |
| 351 | } |
| 352 | |
| 353 | static struct file_system_type jffs2_fs_type = { |
| 354 | .owner = THIS_MODULE, |
| 355 | .name = "jffs2", |
Al Viro | 848b83a | 2010-07-25 00:56:46 +0400 | [diff] [blame] | 356 | .mount = jffs2_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | .kill_sb = jffs2_kill_sb, |
| 358 | }; |
| 359 | |
| 360 | static int __init init_jffs2_fs(void) |
| 361 | { |
| 362 | int ret; |
| 363 | |
David Woodhouse | 3e68fbb | 2006-05-15 00:49:43 +0100 | [diff] [blame] | 364 | /* Paranoia checks for on-medium structures. If we ask GCC |
| 365 | to pack them with __attribute__((packed)) then it _also_ |
| 366 | assumes that they're not aligned -- so it emits crappy |
| 367 | code on some architectures. Ideally we want an attribute |
| 368 | which means just 'no padding', without the alignment |
| 369 | thing. But GCC doesn't have that -- we have to just |
| 370 | hope the structs are the right sizes, instead. */ |
Alexey Dobriyan | 2ecd05a | 2006-10-11 01:22:05 -0700 | [diff] [blame] | 371 | BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12); |
| 372 | BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); |
| 373 | BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68); |
| 374 | BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32); |
David Woodhouse | 3e68fbb | 2006-05-15 00:49:43 +0100 | [diff] [blame] | 375 | |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 376 | pr_info("version 2.2." |
Andrew Victor | 2f82ce1 | 2005-02-09 09:24:26 +0000 | [diff] [blame] | 377 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | " (NAND)" |
| 379 | #endif |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 380 | #ifdef CONFIG_JFFS2_SUMMARY |
| 381 | " (SUMMARY) " |
| 382 | #endif |
David Woodhouse | c00c310 | 2007-04-25 14:16:47 +0100 | [diff] [blame] | 383 | " © 2001-2006 Red Hat, Inc.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", |
| 386 | sizeof(struct jffs2_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 387 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 388 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 389 | jffs2_i_init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | if (!jffs2_inode_cachep) { |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 391 | pr_err("error: Failed to initialise inode cache\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | return -ENOMEM; |
| 393 | } |
| 394 | ret = jffs2_compressors_init(); |
| 395 | if (ret) { |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 396 | pr_err("error: Failed to initialise compressors\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | goto out; |
| 398 | } |
| 399 | ret = jffs2_create_slab_caches(); |
| 400 | if (ret) { |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 401 | pr_err("error: Failed to initialise slab caches\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | goto out_compressors; |
| 403 | } |
| 404 | ret = register_filesystem(&jffs2_fs_type); |
| 405 | if (ret) { |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 406 | pr_err("error: Failed to register filesystem\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | goto out_slab; |
| 408 | } |
| 409 | return 0; |
| 410 | |
| 411 | out_slab: |
| 412 | jffs2_destroy_slab_caches(); |
| 413 | out_compressors: |
| 414 | jffs2_compressors_exit(); |
| 415 | out: |
| 416 | kmem_cache_destroy(jffs2_inode_cachep); |
| 417 | return ret; |
| 418 | } |
| 419 | |
| 420 | static void __exit exit_jffs2_fs(void) |
| 421 | { |
| 422 | unregister_filesystem(&jffs2_fs_type); |
| 423 | jffs2_destroy_slab_caches(); |
| 424 | jffs2_compressors_exit(); |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 425 | |
| 426 | /* |
| 427 | * Make sure all delayed rcu free inodes are flushed before we |
| 428 | * destroy cache. |
| 429 | */ |
| 430 | rcu_barrier(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | kmem_cache_destroy(jffs2_inode_cachep); |
| 432 | } |
| 433 | |
| 434 | module_init(init_jffs2_fs); |
| 435 | module_exit(exit_jffs2_fs); |
| 436 | |
| 437 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); |
| 438 | MODULE_AUTHOR("Red Hat, Inc."); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 439 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | // the sake of this tag. It's Free Software. |