add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/ext2/ialloc.c
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@@ -173,9 +173,7 @@
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 	struct backing_dev_info *bdi;
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 	bdi = inode_to_bdi(inode);
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-	if (bdi_read_congested(bdi))
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-		return;
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-	if (bdi_write_congested(bdi))
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+	if (bdi_rw_congested(bdi))
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 		return;
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 	block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
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@@ -223,8 +221,6 @@
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 			best_desc = desc;
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 		}
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 	}
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-	if (!best_desc)
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-		return -1;
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 	return best_group;
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 }
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@@ -514,6 +510,7 @@
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 	/*
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 	 * Scanned all blockgroups.
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 	 */
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+	brelse(bitmap_bh);
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 	err = -ENOSPC;
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 	goto fail;
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 got: