namei.c

Linux Kernel 2.6.9 for OMAP1710

	bh = NULL;
	lock_kernel();
	res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len,
			 &bh, &de, &i_pos);
	if (res < 0)
		goto rmdir_done;
	/*
	 * Check whether the directory is not in use, then check
	 * whether it is empty.
	 */
	res = fat_dir_empty(inode);
	if (res)
		goto rmdir_done;

	de->name[0] = DELETED_FLAG;
	mark_buffer_dirty(bh);
	fat_detach(inode);
	inode->i_nlink = 0;
	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
	dir->i_nlink--;
	mark_inode_dirty(inode);
	mark_inode_dirty(dir);
	res = 0;

rmdir_done:
	brelse(bh);
	unlock_kernel();
	return res;
}

/***** Make a directory */
static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	struct super_block *sb = dir->i_sb;
	struct buffer_head *bh;
	struct msdos_dir_entry *de;
	struct inode *inode;
	int res,is_hid;
	unsigned char msdos_name[MSDOS_NAME];
	loff_t i_pos;

	lock_kernel();
	res = msdos_format_name(dentry->d_name.name,dentry->d_name.len,
				msdos_name, &MSDOS_SB(sb)->options);
	if (res < 0) {
		unlock_kernel();
		return res;
	}
	is_hid = (dentry->d_name.name[0]=='.') && (msdos_name[0]!='.');
	/* foo vs .foo situation */
	if (fat_scan(dir, msdos_name, &bh, &de, &i_pos) >= 0)
		goto out_exist;

	res = msdos_add_entry(dir, msdos_name, &bh, &de, &i_pos, 1, is_hid);
	if (res)
		goto out_unlock;
	inode = fat_build_inode(dir->i_sb, de, i_pos, &res);
	if (!inode) {
		brelse(bh);
		goto out_unlock;
	}
	res = 0;

	dir->i_nlink++;
	inode->i_nlink = 2; /* no need to mark them dirty */

	res = fat_new_dir(inode, dir, 0);
	if (res)
		goto mkdir_error;

	brelse(bh);
	d_instantiate(dentry, inode);
	res = 0;

out_unlock:
	unlock_kernel();
	return res;

mkdir_error:
	inode->i_nlink = 0;
	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
	dir->i_nlink--;
	mark_inode_dirty(inode);
	mark_inode_dirty(dir);
	de->name[0] = DELETED_FLAG;
	mark_buffer_dirty(bh);
	brelse(bh);
	fat_detach(inode);
	iput(inode);
	goto out_unlock;

out_exist:
	brelse(bh);
	res = -EINVAL;
	goto out_unlock;
}

/***** Unlink a file */
static int msdos_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	loff_t i_pos;
	int res;
	struct buffer_head *bh;
	struct msdos_dir_entry *de;

	bh = NULL;
	lock_kernel();
	res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len,
			 &bh, &de, &i_pos);
	if (res < 0)
		goto unlink_done;

	de->name[0] = DELETED_FLAG;
	mark_buffer_dirty(bh);
	fat_detach(inode);
	brelse(bh);
	inode->i_nlink = 0;
	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
	mark_inode_dirty(inode);
	mark_inode_dirty(dir);
	res = 0;
unlink_done:
	unlock_kernel();
	return res;
}

static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
    struct dentry *old_dentry,
    struct inode *new_dir, unsigned char *new_name, struct dentry *new_dentry,
    struct buffer_head *old_bh,
    struct msdos_dir_entry *old_de, loff_t old_i_pos, int is_hid)
{
	struct buffer_head *new_bh=NULL,*dotdot_bh=NULL;
	struct msdos_dir_entry *new_de,*dotdot_de;
	struct inode *old_inode,*new_inode;
	loff_t new_i_pos, dotdot_i_pos;
	int error;
	int is_dir;

	old_inode = old_dentry->d_inode;
	new_inode = new_dentry->d_inode;
	is_dir = S_ISDIR(old_inode->i_mode);

	if (fat_scan(new_dir, new_name, &new_bh, &new_de, &new_i_pos) >= 0
	    && !new_inode)
		goto degenerate_case;
	if (is_dir) {
		if (new_inode) {
			error = fat_dir_empty(new_inode);
			if (error)
				goto out;
		}
		if (fat_scan(old_inode, MSDOS_DOTDOT, &dotdot_bh,
			     &dotdot_de, &dotdot_i_pos) < 0) {
			error = -EIO;
			goto out;
		}
	}
	if (!new_bh) {
		error = msdos_add_entry(new_dir, new_name, &new_bh, &new_de,
					&new_i_pos, is_dir, is_hid);
		if (error)
			goto out;
	}
	new_dir->i_version++;

	/* There we go */

	if (new_inode)
		fat_detach(new_inode);
	old_de->name[0] = DELETED_FLAG;
	mark_buffer_dirty(old_bh);
	fat_detach(old_inode);
	fat_attach(old_inode, new_i_pos);
	if (is_hid)
		MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
	else
		MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
	mark_inode_dirty(old_inode);
	old_dir->i_version++;
	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
	mark_inode_dirty(old_dir);
	if (new_inode) {
		new_inode->i_nlink--;
		new_inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(new_inode);
	}
	if (dotdot_bh) {
		dotdot_de->start = CT_LE_W(MSDOS_I(new_dir)->i_logstart);
		dotdot_de->starthi = CT_LE_W((MSDOS_I(new_dir)->i_logstart) >> 16);
		mark_buffer_dirty(dotdot_bh);
		old_dir->i_nlink--;
		mark_inode_dirty(old_dir);
		if (new_inode) {
			new_inode->i_nlink--;
			mark_inode_dirty(new_inode);
		} else {
			new_dir->i_nlink++;
			mark_inode_dirty(new_dir);
		}
	}
	error = 0;
out:
	brelse(new_bh);
	brelse(dotdot_bh);
	return error;

degenerate_case:
	error = -EINVAL;
	if (new_de!=old_de)
		goto out;
	if (is_hid)
		MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
	else
		MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
	mark_inode_dirty(old_inode);
	old_dir->i_version++;
	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
	mark_inode_dirty(old_dir);
	return 0;
}

/***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
		struct inode *new_dir, struct dentry *new_dentry)
{
	struct buffer_head *old_bh;
	struct msdos_dir_entry *old_de;
	loff_t old_i_pos;
	int error, is_hid, old_hid; /* if new file and old file are hidden */
	unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];

	lock_kernel();
	error = msdos_format_name(old_dentry->d_name.name,
				  old_dentry->d_name.len,old_msdos_name,
				  &MSDOS_SB(old_dir->i_sb)->options);
	if (error < 0)
		goto rename_done;
	error = msdos_format_name(new_dentry->d_name.name,
				  new_dentry->d_name.len,new_msdos_name,
				  &MSDOS_SB(new_dir->i_sb)->options);
	if (error < 0)
		goto rename_done;

	is_hid  = (new_dentry->d_name.name[0]=='.') && (new_msdos_name[0]!='.');
	old_hid = (old_dentry->d_name.name[0]=='.') && (old_msdos_name[0]!='.');
	error = fat_scan(old_dir, old_msdos_name, &old_bh, &old_de, &old_i_pos);
	if (error < 0)
		goto rename_done;

	error = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
				new_dir, new_msdos_name, new_dentry,
				old_bh, old_de, old_i_pos, is_hid);
	brelse(old_bh);

rename_done:
	unlock_kernel();
	return error;
}

static struct inode_operations msdos_dir_inode_operations = {
	.create		= msdos_create,
	.lookup		= msdos_lookup,
	.unlink		= msdos_unlink,
	.mkdir		= msdos_mkdir,
	.rmdir		= msdos_rmdir,
	.rename		= msdos_rename,
	.setattr	= fat_notify_change,
};

static int msdos_fill_super(struct super_block *sb,void *data, int silent)
{
	int res;

	res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
	if (res)
		return res;

	sb->s_root->d_op = &msdos_dentry_operations;
	return 0;
}

static struct super_block *msdos_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
}

static struct file_system_type msdos_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "msdos",
	.get_sb		= msdos_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_msdos_fs(void)
{
	return register_filesystem(&msdos_fs_type);
}

static void __exit exit_msdos_fs(void)
{
	unregister_filesystem(&msdos_fs_type);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Werner Almesberger");
MODULE_DESCRIPTION("MS-DOS filesystem support");

module_init(init_msdos_fs)
module_exit(exit_msdos_fs)