C++ (Cpp) bdi_get Examples

Example #1

File: backing-dev.c Project: SantoshShilimkar/linux

static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
		   int blkcg_id, gfp_t gfp)
{
	int i, err;

	memset(wb, 0, sizeof(*wb));

	if (wb != &bdi->wb)
		bdi_get(bdi);
	wb->bdi = bdi;
	wb->last_old_flush = jiffies;
	INIT_LIST_HEAD(&wb->b_dirty);
	INIT_LIST_HEAD(&wb->b_io);
	INIT_LIST_HEAD(&wb->b_more_io);
	INIT_LIST_HEAD(&wb->b_dirty_time);
	spin_lock_init(&wb->list_lock);

	wb->bw_time_stamp = jiffies;
	wb->balanced_dirty_ratelimit = INIT_BW;
	wb->dirty_ratelimit = INIT_BW;
	wb->write_bandwidth = INIT_BW;
	wb->avg_write_bandwidth = INIT_BW;

	spin_lock_init(&wb->work_lock);
	INIT_LIST_HEAD(&wb->work_list);
	INIT_DELAYED_WORK(&wb->dwork, wb_workfn);
	wb->dirty_sleep = jiffies;

	wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp);
	if (!wb->congested) {
		err = -ENOMEM;
		goto out_put_bdi;
	}

	err = fprop_local_init_percpu(&wb->completions, gfp);
	if (err)
		goto out_put_cong;

	for (i = 0; i < NR_WB_STAT_ITEMS; i++) {
		err = percpu_counter_init(&wb->stat[i], 0, gfp);
		if (err)
			goto out_destroy_stat;
	}

	return 0;

out_destroy_stat:
	while (i--)
		percpu_counter_destroy(&wb->stat[i]);
	fprop_local_destroy_percpu(&wb->completions);
out_put_cong:
	wb_congested_put(wb->congested);
out_put_bdi:
	if (wb != &bdi->wb)
		bdi_put(bdi);
	return err;
}

Example #2

File: super.c Project: guribe94/linux

/**
 * nilfs_fill_super() - initialize a super block instance
 * @sb: super_block
 * @data: mount options
 * @silent: silent mode flag
 *
 * This function is called exclusively by nilfs->ns_mount_mutex.
 * So, the recovery process is protected from other simultaneous mounts.
 */
static int
nilfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct the_nilfs *nilfs;
	struct nilfs_root *fsroot;
	__u64 cno;
	int err;

	nilfs = alloc_nilfs(sb);
	if (!nilfs)
		return -ENOMEM;

	sb->s_fs_info = nilfs;

	err = init_nilfs(nilfs, sb, (char *)data);
	if (err)
		goto failed_nilfs;

	sb->s_op = &nilfs_sops;
	sb->s_export_op = &nilfs_export_ops;
	sb->s_root = NULL;
	sb->s_time_gran = 1;
	sb->s_max_links = NILFS_LINK_MAX;

	sb->s_bdi = bdi_get(sb->s_bdev->bd_bdi);

	err = load_nilfs(nilfs, sb);
	if (err)
		goto failed_nilfs;

	cno = nilfs_last_cno(nilfs);
	err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
	if (err) {
		nilfs_msg(sb, KERN_ERR,
			  "error %d while loading last checkpoint (checkpoint number=%llu)",
			  err, (unsigned long long)cno);
		goto failed_unload;
	}

	if (!sb_rdonly(sb)) {
		err = nilfs_attach_log_writer(sb, fsroot);
		if (err)
			goto failed_checkpoint;
	}

	err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
	if (err)
		goto failed_segctor;

	nilfs_put_root(fsroot);

	if (!sb_rdonly(sb)) {
		down_write(&nilfs->ns_sem);
		nilfs_setup_super(sb, true);
		up_write(&nilfs->ns_sem);
	}

	return 0;

 failed_segctor:
	nilfs_detach_log_writer(sb);

 failed_checkpoint:
	nilfs_put_root(fsroot);

 failed_unload:
	iput(nilfs->ns_sufile);
	iput(nilfs->ns_cpfile);
	iput(nilfs->ns_dat);

 failed_nilfs:
	destroy_nilfs(nilfs);
	return err;
}