int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	int err;

	if (WARN_ON_ONCE(current->flags & PF_MEMALLOC) ||
	    sb_rdonly(inode->i_sb))
		return 0;

	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
		return -EIO;

	if (EXT4_SB(inode->i_sb)->s_journal) {
		if (ext4_journal_current_handle()) {
			jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
			dump_stack();
			return -EIO;
		}

		/*
		 * No need to force transaction in WB_SYNC_NONE mode. Also
		 * ext4_sync_fs() will force the commit after everything is
		 * written.
		 */
		if (wbc->sync_mode != WB_SYNC_ALL || wbc->for_sync)
			return 0;

		err = jbd2_complete_transaction(EXT4_SB(inode->i_sb)->s_journal,
						EXT4_I(inode)->i_sync_tid);
	} else {
		struct ext4_iloc iloc;

		err = __ext4_get_inode_loc(inode, &iloc, 0);
		if (err)
			return err;
		/*
		 * sync(2) will flush the whole buffer cache. No need to do
		 * it here separately for each inode.
		 */
		if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
			sync_dirty_buffer(iloc.bh);
		if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) {
			ext4_error_inode_block(inode, iloc.bh->b_blocknr, EIO,
					       "IO error syncing inode");
			err = -EIO;
		}
		brelse(iloc.bh);
	}
	return err;
}
int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	int err;

	if (WARN_ON_ONCE(current->flags & PF_MEMALLOC) ||
	    sb_rdonly(inode->i_sb))
		return 0;

	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
		return -EIO;

	if (EXT4_SB(inode->i_sb)->s_journal) {
		if (ext4_journal_current_handle()) {
			jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
			dump_stack();
			return -EIO;
		}

		 
		if (wbc->sync_mode != WB_SYNC_ALL || wbc->for_sync)
			return 0;

		err = jbd2_complete_transaction(EXT4_SB(inode->i_sb)->s_journal,
						EXT4_I(inode)->i_sync_tid);
	} else {
		struct ext4_iloc iloc;

		err = __ext4_get_inode_loc(inode, &iloc, 0);
		if (err)
			return err;
		 
		if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
			sync_dirty_buffer(iloc.bh);
		if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) {
			ext4_error_inode_block(inode, iloc.bh->b_blocknr, EIO,
					       "IO error syncing inode");
			err = -EIO;
		}
		brelse(iloc.bh);
	}
	return err;
}