From 900876410fe52fe4bf381040ec5eeed976367ba5 Mon Sep 17 00:00:00 2001
From: Yan <yanzheng@21cn.com>
Date: Mon, 29 Oct 2007 11:41:07 -0400
Subject: [PATCH] --- yaml --- r: 128517 b: refs/heads/master c:
 689f9346612d96ab93890160cf2fe0df5217ab73 h: refs/heads/master i:   128515:
 ca92f361a63a629810d99a57a24584d470090c4c v: v3

---
 [refs]                 |  2 +-
 trunk/fs/btrfs/inode.c | 34 ++++++++++++++++++----------------
 2 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/[refs] b/[refs]
index 76c3e6f5e1d2..718cd3c89722 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c67cda1758130f3e437744c4c2ec4a7cc25564e3
+refs/heads/master: 689f9346612d96ab93890160cf2fe0df5217ab73
diff --git a/trunk/fs/btrfs/inode.c b/trunk/fs/btrfs/inode.c
index c88f13a88555..0ba1cdbdf112 100644
--- a/trunk/fs/btrfs/inode.c
+++ b/trunk/fs/btrfs/inode.c
@@ -1596,8 +1596,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
 
 		size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
 						    path->slots[0]));
-
-		extent_end = (extent_start + size) |
+		extent_end = (extent_start + size - 1) |
 			((u64)root->sectorsize - 1);
 		if (start < extent_start || start >= extent_end) {
 			em->start = start;
@@ -1610,29 +1609,32 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
 			}
 			goto not_found_em;
 		}
+		em->block_start = EXTENT_MAP_INLINE;
+		em->block_end = EXTENT_MAP_INLINE;
+
+		if (!page) {
+			em->start = extent_start;
+			em->end = extent_start + size - 1;
+			goto out;
+		}
 
 		extent_offset = (page->index << PAGE_CACHE_SHIFT) -
-			extent_start;
-		ptr = btrfs_file_extent_inline_start(item) + extent_offset;
-		map = kmap(page);
+			extent_start + page_offset;
 		copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
 				size - extent_offset);
-
-		em->block_start = EXTENT_MAP_INLINE;
-		em->block_end = EXTENT_MAP_INLINE;
 		em->start = extent_start + extent_offset;
 		em->end = (em->start + copy_size -1) |
 			((u64)root->sectorsize -1);
-
-		if (!page) {
-			goto insert;
+		map = kmap(page);
+		ptr = btrfs_file_extent_inline_start(item) + extent_offset;
+		read_extent_buffer(leaf, map + page_offset, ptr, copy_size);
+		
+		if (em->start + copy_size <= em->end) {
+			size = min_t(u64, em->end + 1 - em->start,
+				PAGE_CACHE_SIZE - page_offset) - copy_size;
+			memset(map + page_offset + copy_size, 0, size);
 		}
 
-		read_extent_buffer(leaf, map + page_offset, ptr, copy_size);
-		/*
-		memset(map + page_offset + copy_size, 0,
-		       PAGE_CACHE_SIZE - copy_size - page_offset);
-		       */
 		flush_dcache_page(page);
 		kunmap(page);
 		set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);