Initial import

1 files changed, 442 insertions, 0 deletions

diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
new file mode 100644
index 000000000..d86c5e317
--- /dev/null
+++ b/fs/jffs2/super.c
@@ -0,0 +1,442 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/mount.h>
+#include <linux/parser.h>
+#include <linux/jffs2.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/super.h>
+#include <linux/ctype.h>
+#include <linux/namei.h>
+#include <linux/seq_file.h>
+#include <linux/exportfs.h>
+#include "compr.h"
+#include "nodelist.h"
+
+static void jffs2_put_super(struct super_block *);
+
+static struct kmem_cache *jffs2_inode_cachep;
+
+static struct inode *jffs2_alloc_inode(struct super_block *sb)
+{
+	struct jffs2_inode_info *f;
+
+	f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
+	if (!f)
+		return NULL;
+	return &f->vfs_inode;
+}
+
+static void jffs2_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
+}
+
+static void jffs2_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, jffs2_i_callback);
+}
+
+static void jffs2_i_init_once(void *foo)
+{
+	struct jffs2_inode_info *f = foo;
+
+	mutex_init(&f->sem);
+	inode_init_once(&f->vfs_inode);
+}
+
+static const char *jffs2_compr_name(unsigned int compr)
+{
+	switch (compr) {
+	case JFFS2_COMPR_MODE_NONE:
+		return "none";
+#ifdef CONFIG_JFFS2_LZO
+	case JFFS2_COMPR_MODE_FORCELZO:
+		return "lzo";
+#endif
+#ifdef CONFIG_JFFS2_ZLIB
+	case JFFS2_COMPR_MODE_FORCEZLIB:
+		return "zlib";
+#endif
+	default:
+		/* should never happen; programmer error */
+		WARN_ON(1);
+		return "";
+	}
+}
+
+static int jffs2_show_options(struct seq_file *s, struct dentry *root)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
+	struct jffs2_mount_opts *opts = &c->mount_opts;
+
+	if (opts->override_compr)
+		seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
+	if (opts->rp_size)
+		seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
+
+	return 0;
+}
+
+static int jffs2_sync_fs(struct super_block *sb, int wait)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
+	cancel_delayed_work_sync(&c->wbuf_dwork);
+#endif
+
+	mutex_lock(&c->alloc_sem);
+	jffs2_flush_wbuf_pad(c);
+	mutex_unlock(&c->alloc_sem);
+	return 0;
+}
+
+static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+					 uint32_t generation)
+{
+	/* We don't care about i_generation. We'll destroy the flash
+	   before we start re-using inode numbers anyway. And even
+	   if that wasn't true, we'd have other problems...*/
+	return jffs2_iget(sb, ino);
+}
+
+static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
+					 int fh_len, int fh_type)
+{
+        return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+                                    jffs2_nfs_get_inode);
+}
+
+static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
+					 int fh_len, int fh_type)
+{
+        return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+                                    jffs2_nfs_get_inode);
+}
+
+static struct dentry *jffs2_get_parent(struct dentry *child)
+{
+	struct jffs2_inode_info *f;
+	uint32_t pino;
+
+	BUG_ON(!d_is_dir(child));
+
+	f = JFFS2_INODE_INFO(d_inode(child));
+
+	pino = f->inocache->pino_nlink;
+
+	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
+		    f->inocache->ino, pino);
+
+	return d_obtain_alias(jffs2_iget(d_inode(child)->i_sb, pino));
+}
+
+static const struct export_operations jffs2_export_ops = {
+	.get_parent = jffs2_get_parent,
+	.fh_to_dentry = jffs2_fh_to_dentry,
+	.fh_to_parent = jffs2_fh_to_parent,
+};
+
+/*
+ * JFFS2 mount options.
+ *
+ * Opt_override_compr: override default compressor
+ * Opt_rp_size: size of reserved pool in KiB
+ * Opt_err: just end of array marker
+ */
+enum {
+	Opt_override_compr,
+	Opt_rp_size,
+	Opt_err,
+};
+
+static const match_table_t tokens = {
+	{Opt_override_compr, "compr=%s"},
+	{Opt_rp_size, "rp_size=%u"},
+	{Opt_err, NULL},
+};
+
+static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
+{
+	substring_t args[MAX_OPT_ARGS];
+	char *p, *name;
+	unsigned int opt;
+
+	if (!data)
+		return 0;
+
+	while ((p = strsep(&data, ","))) {
+		int token;
+
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_override_compr:
+			name = match_strdup(&args[0]);
+
+			if (!name)
+				return -ENOMEM;
+			if (!strcmp(name, "none"))
+				c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
+#ifdef CONFIG_JFFS2_LZO
+			else if (!strcmp(name, "lzo"))
+				c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
+#endif
+#ifdef CONFIG_JFFS2_ZLIB
+			else if (!strcmp(name, "zlib"))
+				c->mount_opts.compr =
+						JFFS2_COMPR_MODE_FORCEZLIB;
+#endif
+			else {
+				pr_err("Error: unknown compressor \"%s\"\n",
+				       name);
+				kfree(name);
+				return -EINVAL;
+			}
+			kfree(name);
+			c->mount_opts.override_compr = true;
+			break;
+		case Opt_rp_size:
+			if (match_int(&args[0], &opt))
+				return -EINVAL;
+			opt *= 1024;
+			if (opt > c->mtd->size) {
+				pr_warn("Too large reserve pool specified, max "
+					"is %llu KB\n", c->mtd->size / 1024);
+				return -EINVAL;
+			}
+			c->mount_opts.rp_size = opt;
+			break;
+		default:
+			pr_err("Error: unrecognized mount option '%s' or missing value\n",
+			       p);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+	int err;
+
+	sync_filesystem(sb);
+	err = jffs2_parse_options(c, data);
+	if (err)
+		return -EINVAL;
+
+	return jffs2_do_remount_fs(sb, flags, data);
+}
+
+static const struct super_operations jffs2_super_operations =
+{
+	.alloc_inode =	jffs2_alloc_inode,
+	.destroy_inode =jffs2_destroy_inode,
+	.put_super =	jffs2_put_super,
+	.statfs =	jffs2_statfs,
+	.remount_fs =	jffs2_remount_fs,
+	.evict_inode =	jffs2_evict_inode,
+	.dirty_inode =	jffs2_dirty_inode,
+	.show_options =	jffs2_show_options,
+	.sync_fs =	jffs2_sync_fs,
+};
+
+/*
+ * fill in the superblock
+ */
+static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct jffs2_sb_info *c;
+	int ret;
+
+	jffs2_dbg(1, "jffs2_get_sb_mtd():"
+		  " New superblock for device %d (\"%s\")\n",
+		  sb->s_mtd->index, sb->s_mtd->name);
+
+	c = kzalloc(sizeof(*c), GFP_KERNEL);
+	if (!c)
+		return -ENOMEM;
+
+	c->mtd = sb->s_mtd;
+	c->os_priv = sb;
+	sb->s_fs_info = c;
+
+	ret = jffs2_parse_options(c, data);
+	if (ret) {
+		kfree(c);
+		return -EINVAL;
+	}
+
+	/* Initialize JFFS2 superblock locks, the further initialization will
+	 * be done later */
+	mutex_init(&c->alloc_sem);
+	mutex_init(&c->erase_free_sem);
+	init_waitqueue_head(&c->erase_wait);
+	init_waitqueue_head(&c->inocache_wq);
+	spin_lock_init(&c->erase_completion_lock);
+	spin_lock_init(&c->inocache_lock);
+
+	sb->s_op = &jffs2_super_operations;
+	sb->s_export_op = &jffs2_export_ops;
+	sb->s_flags = sb->s_flags | MS_NOATIME;
+	sb->s_xattr = jffs2_xattr_handlers;
+#ifdef CONFIG_JFFS2_FS_POSIX_ACL
+	sb->s_flags |= MS_POSIXACL;
+#endif
+	ret = jffs2_do_fill_super(sb, data, silent);
+	return ret;
+}
+
+static struct dentry *jffs2_mount(struct file_system_type *fs_type,
+			int flags, const char *dev_name,
+			void *data)
+{
+	return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
+}
+
+static void jffs2_put_super (struct super_block *sb)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+
+	jffs2_dbg(2, "%s()\n", __func__);
+
+	mutex_lock(&c->alloc_sem);
+	jffs2_flush_wbuf_pad(c);
+	mutex_unlock(&c->alloc_sem);
+
+	jffs2_sum_exit(c);
+
+	jffs2_free_ino_caches(c);
+	jffs2_free_raw_node_refs(c);
+	if (jffs2_blocks_use_vmalloc(c))
+		vfree(c->blocks);
+	else
+		kfree(c->blocks);
+	jffs2_flash_cleanup(c);
+	kfree(c->inocache_list);
+	jffs2_clear_xattr_subsystem(c);
+	mtd_sync(c->mtd);
+	jffs2_dbg(1, "%s(): returning\n", __func__);
+}
+
+static void jffs2_kill_sb(struct super_block *sb)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
+	if (!(sb->s_flags & MS_RDONLY))
+		jffs2_stop_garbage_collect_thread(c);
+	kill_mtd_super(sb);
+	kfree(c);
+}
+
+static struct file_system_type jffs2_fs_type = {
+	.owner =	THIS_MODULE,
+	.name =		"jffs2",
+	.mount =	jffs2_mount,
+	.kill_sb =	jffs2_kill_sb,
+};
+MODULE_ALIAS_FS("jffs2");
+
+static int __init init_jffs2_fs(void)
+{
+	int ret;
+
+	/* Paranoia checks for on-medium structures. If we ask GCC
+	   to pack them with __attribute__((packed)) then it _also_
+	   assumes that they're not aligned -- so it emits crappy
+	   code on some architectures. Ideally we want an attribute
+	   which means just 'no padding', without the alignment
+	   thing. But GCC doesn't have that -- we have to just
+	   hope the structs are the right sizes, instead. */
+	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
+	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
+	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
+	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
+
+	pr_info("version 2.2."
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
+	       " (NAND)"
+#endif
+#ifdef CONFIG_JFFS2_SUMMARY
+	       " (SUMMARY) "
+#endif
+	       " © 2001-2006 Red Hat, Inc.\n");
+
+	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
+					     sizeof(struct jffs2_inode_info),
+					     0, (SLAB_RECLAIM_ACCOUNT|
+						SLAB_MEM_SPREAD),
+					     jffs2_i_init_once);
+	if (!jffs2_inode_cachep) {
+		pr_err("error: Failed to initialise inode cache\n");
+		return -ENOMEM;
+	}
+	ret = jffs2_compressors_init();
+	if (ret) {
+		pr_err("error: Failed to initialise compressors\n");
+		goto out;
+	}
+	ret = jffs2_create_slab_caches();
+	if (ret) {
+		pr_err("error: Failed to initialise slab caches\n");
+		goto out_compressors;
+	}
+	ret = register_filesystem(&jffs2_fs_type);
+	if (ret) {
+		pr_err("error: Failed to register filesystem\n");
+		goto out_slab;
+	}
+	return 0;
+
+ out_slab:
+	jffs2_destroy_slab_caches();
+ out_compressors:
+	jffs2_compressors_exit();
+ out:
+	kmem_cache_destroy(jffs2_inode_cachep);
+	return ret;
+}
+
+static void __exit exit_jffs2_fs(void)
+{
+	unregister_filesystem(&jffs2_fs_type);
+	jffs2_destroy_slab_caches();
+	jffs2_compressors_exit();
+
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(jffs2_inode_cachep);
+}
+
+module_init(init_jffs2_fs);
+module_exit(exit_jffs2_fs);
+
+MODULE_DESCRIPTION("The Journalling Flash File System, v2");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
+		       // the sake of this tag. It's Free Software.