1 files changed, 17 insertions, 11 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c81e14162ef1..4a40282b45f7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -95,6 +95,7 @@ int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf)
 int btrfs_finish_extent_commit(struct btrfs_root *root)
 {
         unsigned long gang[8];
+        u64 first = 0;
         int ret;
         int i;
 
@@ -104,11 +105,13 @@ int btrfs_finish_extent_commit(struct btrfs_root *root)
                                                  ARRAY_SIZE(gang));
                 if (!ret)
                         break;
+                if (!first)
+                        first = gang[0];
                 for (i = 0; i < ret; i++) {
                         radix_tree_delete(&root->pinned_radix, gang[i]);
                 }
         }
-        root->last_insert.objectid = 0;
+        root->last_insert.objectid = first;
         root->last_insert.offset = 0;
         return 0;
 }
@@ -140,7 +143,8 @@ static int finish_current_insert(struct btrfs_root *extent_root)
 /*
  * remove an extent from the root, returns 0 on success
  */
-static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
+static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks,
+                         int pin)
 {
         struct btrfs_path path;
         struct btrfs_key key;
@@ -150,6 +154,7 @@ static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
         struct btrfs_key ins;
         u32 refs;
 
+        BUG_ON(pin && num_blocks != 1);
         key.objectid = blocknr;
         key.flags = 0;
         btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
@@ -170,7 +175,7 @@ static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
         refs = btrfs_extent_refs(ei) - 1;
         btrfs_set_extent_refs(ei, refs);
         if (refs == 0) {
-                if (!root->ref_cows) {
+                if (pin) {
                         int err;
                         radix_tree_preload(GFP_KERNEL);
                         err = radix_tree_insert(&extent_root->pinned_radix,
@@ -179,8 +184,7 @@ static int __free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
                         radix_tree_preload_end();
                 }
                 ret = btrfs_del_item(extent_root, &path);
-                if (root != extent_root &&
-                    extent_root->last_insert.objectid > blocknr)
+                if (!pin && extent_root->last_insert.objectid > blocknr)
                         extent_root->last_insert.objectid = blocknr;
                 if (ret)
                         BUG();
@@ -208,7 +212,8 @@ static int del_pending_extents(struct btrfs_root *extent_root)
                 if (!ret)
                         break;
                 for (i = 0; i < ret; i++) {
-                        ret = __free_extent(extent_root, gang[i]->blocknr, 1);
+                        ret = __free_extent(extent_root,
+                                            gang[i]->blocknr, 1, 1);
                         radix_tree_tag_clear(&extent_root->cache_radix,
                                                 gang[i]->blocknr,
                                                 CTREE_EXTENT_PENDING_DEL);
@@ -230,7 +235,8 @@ static int run_pending(struct btrfs_root *extent_root)
 /*
  * remove an extent from the root, returns 0 on success
  */
-int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
+int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks,
+                      int pin)
 {
         struct btrfs_root *extent_root = root->extent_root;
         struct btrfs_buffer *t;
@@ -243,7 +249,7 @@ int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks)
                                    CTREE_EXTENT_PENDING_DEL);
                 return 0;
         }
-        ret = __free_extent(root, blocknr, num_blocks);
+        ret = __free_extent(root, blocknr, num_blocks, pin);
         pending_ret = run_pending(root->extent_root);
         return ret ? ret : pending_ret;
 }
@@ -451,7 +457,7 @@ static int walk_down_tree(struct btrfs_root *root,
                 ret = lookup_block_ref(root, blocknr, &refs);
                 if (refs != 1 || *level == 1) {
                         path->slots[*level]++;
-                        ret = btrfs_free_extent(root, blocknr, 1);
+                        ret = btrfs_free_extent(root, blocknr, 1, 1);
                         BUG_ON(ret);
                         continue;
                 }
@@ -464,7 +470,7 @@ static int walk_down_tree(struct btrfs_root *root,
                 path->slots[*level] = 0;
         }
 out:
-        ret = btrfs_free_extent(root, path->nodes[*level]->blocknr, 1);
+        ret = btrfs_free_extent(root, path->nodes[*level]->blocknr, 1, 1);
         btrfs_block_release(root, path->nodes[*level]);
         path->nodes[*level] = NULL;
         *level += 1;
@@ -492,7 +498,7 @@ static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path,
                         return 0;
                 } else {
                         ret = btrfs_free_extent(root,
-                                          path->nodes[*level]->blocknr, 1);
+                                          path->nodes[*level]->blocknr, 1, 1);
                         btrfs_block_release(root, path->nodes[*level]);
                         path->nodes[*level] = NULL;
                         *level = i + 1;