try_to_writeback_inodes_sb
try_to_writeback_inodes_sb(fs_info->sb, WB_REASON_SYNC);
try_to_writeback_inodes_sb(sb, WB_REASON_FS_FREE_SPACE);
EXPORT_SYMBOL(try_to_writeback_inodes_sb);
void try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason);