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Commit 618e21d5 authored by Josef Bacik's avatar Josef Bacik Committed by David Woodhouse
Browse files

Btrfs: Implement mknod 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent a1f39630

fs/btrfs/inode.c

+66 −6
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ struct btrfs_iget_args { 
static struct inode_operations btrfs_dir_inode_operations;

static struct inode_operations btrfs_symlink_inode_operations;

static struct inode_operations btrfs_dir_ro_inode_operations;

static struct inode_operations btrfs_special_inode_operations;

static struct inode_operations btrfs_file_inode_operations;

static struct address_space_operations btrfs_aops;

static struct address_space_operations btrfs_symlink_aops;
@@ -75,6 +76,7 @@ void btrfs_read_locked_inode(struct inode *inode) 
	struct btrfs_root *root = BTRFS_I(inode)->root;

	struct btrfs_key location;

	u64 alloc_group_block;

	u32 rdev;

	int ret;



	path = btrfs_alloc_path();
@@ -104,6 +106,8 @@ void btrfs_read_locked_inode(struct inode *inode) 
	inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);

	inode->i_blocks = btrfs_inode_nblocks(inode_item);

	inode->i_generation = btrfs_inode_generation(inode_item);

	inode->i_rdev = 0;

	rdev = btrfs_inode_rdev(inode_item);

	alloc_group_block = btrfs_inode_block_group(inode_item);

	BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,

						       alloc_group_block);
@@ -114,12 +118,6 @@ void btrfs_read_locked_inode(struct inode *inode) 
	mutex_unlock(&root->fs_info->fs_mutex);



	switch (inode->i_mode & S_IFMT) {

#if 0

	default:

		init_special_inode(inode, inode->i_mode,

				   btrfs_inode_rdev(inode_item));

		break;

#endif

	case S_IFREG:

		inode->i_mapping->a_ops = &btrfs_aops;

		inode->i_fop = &btrfs_file_operations;
@@ -136,6 +134,9 @@ void btrfs_read_locked_inode(struct inode *inode) 
		inode->i_op = &btrfs_symlink_inode_operations;

		inode->i_mapping->a_ops = &btrfs_symlink_aops;

		break;

	default:

		init_special_inode(inode, inode->i_mode, rdev);

		break;

	}

	return;
@@ -162,6 +163,7 @@ static void fill_inode_item(struct btrfs_inode_item *item, 
	btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);

	btrfs_set_inode_nblocks(item, inode->i_blocks);

	btrfs_set_inode_generation(item, inode->i_generation);

	btrfs_set_inode_rdev(item, inode->i_rdev);

	btrfs_set_inode_block_group(item,

				    BTRFS_I(inode)->block_group->key.objectid);

}
@@ -1070,6 +1072,58 @@ static int btrfs_add_nondir(struct btrfs_trans_handle *trans, 
	return err;

}



static int btrfs_mknod(struct inode *dir, struct dentry *dentry,

			int mode, dev_t rdev)

{

	struct btrfs_trans_handle *trans;

	struct btrfs_root *root = BTRFS_I(dir)->root;

	struct inode *inode;

	int err;

	int drop_inode = 0;

	u64 objectid;



	if (!new_valid_dev(rdev))

		return -EINVAL;



	mutex_lock(&root->fs_info->fs_mutex);

	trans = btrfs_start_transaction(root, 1);

	btrfs_set_trans_block_group(trans, dir);



	err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);

	if (err) {

		err = -ENOSPC;

		goto out_unlock;

	}



	inode = btrfs_new_inode(trans, root, objectid,

				BTRFS_I(dir)->block_group, mode);

	err = PTR_ERR(inode);

	if (IS_ERR(inode))

		goto out_unlock;



	btrfs_set_trans_block_group(trans, inode);

	err = btrfs_add_nondir(trans, dentry, inode);

	if (err)

		drop_inode = 1;

	else {

		inode->i_op = &btrfs_special_inode_operations;

		init_special_inode(inode, inode->i_mode, rdev);

	}

	dir->i_sb->s_dirt = 1;

	btrfs_update_inode_block_group(trans, inode);

	btrfs_update_inode_block_group(trans, dir);

out_unlock:

	btrfs_end_transaction(trans, root);

	mutex_unlock(&root->fs_info->fs_mutex);



	if (drop_inode) {

		inode_dec_link_count(inode);

		iput(inode);

	}

	btrfs_btree_balance_dirty(root);

	return err;

}



static int btrfs_create(struct inode *dir, struct dentry *dentry,

			int mode, struct nameidata *nd)

{
@@ -2526,6 +2580,7 @@ static struct inode_operations btrfs_dir_inode_operations = { 
	.rename		= btrfs_rename,

	.symlink	= btrfs_symlink,

	.setattr	= btrfs_setattr,

	.mknod		= btrfs_mknod,

};



static struct inode_operations btrfs_dir_ro_inode_operations = {
@@ -2562,6 +2617,11 @@ static struct inode_operations btrfs_file_inode_operations = { 
	.setattr	= btrfs_setattr,

};



static struct inode_operations btrfs_special_inode_operations = {

	.getattr	= btrfs_getattr,

	.setattr	= btrfs_setattr,

};



static struct inode_operations btrfs_symlink_inode_operations = {

	.readlink	= generic_readlink,

	.follow_link	= page_follow_link_light,