Btrfs: Fix "no csum found for inode" issue.

A few codes were not properly updated for changes of extent map.  This
may be the causes of "no csum found for inode" issue.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

2 files changed, 7 insertions, 3 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fcae999ab712..9262ab37a7cd 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2417,12 +2417,13 @@ int try_release_extent_mapping(struct extent_map_tree *map,
         u64 end = start + PAGE_CACHE_SIZE - 1;
         u64 orig_start = start;
         int ret = 1;
-
         if ((mask & __GFP_WAIT) &&
             page->mapping->host->i_size > 16 * 1024 * 1024) {
+                u64 len;
                 while (start <= end) {
+                        len = end - start + 1;
                         spin_lock(&map->lock);
-                        em = lookup_extent_mapping(map, start, end);
+                        em = lookup_extent_mapping(map, start, len);
                         if (!em || IS_ERR(em)) {
                                 spin_unlock(&map->lock);
                                 break;
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index f89396082544..b0352b5958a5 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -357,10 +357,13 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
 {
         struct extent_map *em;
         struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+        u64 len = end - start + 1;
 
+        if (end == (u64)-1)
+                len = (u64)-1;
         while(1) {
                 spin_lock(&em_tree->lock);
-                em = lookup_extent_mapping(em_tree, start, end);
+                em = lookup_extent_mapping(em_tree, start, len);
                 if (!em) {
                         spin_unlock(&em_tree->lock);
                         break;