From 098f59c2512426926722a96f82af127bd91fb5e4 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 11 May 2007 11:33:21 -0400
Subject: [PATCH] Btrfs: patch queue: fix corruption when splitting large items

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
 fs/btrfs/ctree.c | 10 ++++++++--
 fs/btrfs/super.c |  8 ++++----
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 990d297a7a13..20e01f95ce6e 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -871,6 +871,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
 	btrfs_set_node_blockptr(lower, slot, blocknr);
 	btrfs_set_header_nritems(&lower->header, nritems + 1);
 	btrfs_mark_buffer_dirty(path->nodes[level]);
+	check_node(root, path, level);
 	return 0;
 }
 
@@ -1101,6 +1102,8 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 	} else {
 		btrfs_block_release(root, right_buf);
 	}
+	if (path->nodes[1])
+		check_node(root, path, 1);
 	return 0;
 }
 /*
@@ -1216,6 +1219,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 
 	btrfs_mark_buffer_dirty(t);
 	btrfs_mark_buffer_dirty(right_buf);
+
 	wret = fixup_low_keys(trans, root, path, &right->items[0].key, 1);
 	if (wret)
 		ret = wret;
@@ -1231,6 +1235,8 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 		path->slots[0] -= push_items;
 	}
 	BUG_ON(path->slots[0] < 0);
+	if (path->nodes[1])
+		check_node(root, path, 1);
 	return ret;
 }
 
@@ -1326,13 +1332,12 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 				wret = insert_ptr(trans, root, path,
 						  &disk_key,
 						  bh_blocknr(right_buffer),
-						  path->slots[1] - 1, 1);
+						  path->slots[1], 1);
 				if (wret)
 					ret = wret;
 				btrfs_block_release(root, path->nodes[0]);
 				path->nodes[0] = right_buffer;
 				path->slots[0] = 0;
-				path->slots[1] -= 1;
 				if (path->slots[1] == 0) {
 					wret = fixup_low_keys(trans, root,
 					           path, &disk_key, 1);
@@ -1379,6 +1384,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 	} else
 		btrfs_block_release(root, right_buffer);
 	BUG_ON(path->slots[0] < 0);
+	check_node(root, path, 1);
 
 	if (!double_split)
 		return ret;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 4c2870e2d12f..eaa48f09d1c4 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1529,7 +1529,8 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
 			btrfs_set_file_extent_type(ei,
 						   BTRFS_FILE_EXTENT_INLINE);
 			ptr = btrfs_file_extent_inline_start(ei);
-			memcpy(ptr, bh->b_data, offset + write_bytes);
+			btrfs_memcpy(root, path->nodes[0]->b_data,
+				     ptr, bh->b_data, offset + write_bytes);
 			mark_buffer_dirty(path->nodes[0]);
 			btrfs_free_path(path);
 		} else {
@@ -1686,9 +1687,9 @@ static int drop_extents(struct btrfs_trans_handle *trans,
 			ret = btrfs_del_item(trans, root, path);
 			BUG_ON(ret);
 			btrfs_release_path(root, path);
+			extent = NULL;
 			if (found_extent) {
-				inode->i_blocks -=
-				btrfs_file_extent_num_blocks(extent) << 3;
+				inode->i_blocks -= extent_num_blocks << 3;
 				ret = btrfs_free_extent(trans, root,
 							disk_blocknr,
 							disk_num_blocks, 0);
@@ -1832,7 +1833,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 	u64 alloc_extent_start;
 	struct btrfs_trans_handle *trans;
 	struct btrfs_key ins;
-
 	pinned[0] = NULL;
 	pinned[1] = NULL;
 	if (file->f_flags & O_DIRECT)
-- 
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