1 files changed, 30 insertions, 0 deletions

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 7990b5742114..0782e924ddeb 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -2,6 +2,7 @@
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
+#include "print-tree.h"
 
 #define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \
                                sizeof(struct btrfs_item) * 2) / \
@@ -27,6 +28,10 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 
         ret = btrfs_insert_empty_item(trans, root, path, &file_key,
                                       sizeof(*item));
+        if (ret) {
+printk("failed to insert %Lu %Lu ret %d\n", objectid, pos, ret);
+btrfs_print_leaf(root, btrfs_buffer_leaf(path->nodes[0]));
+        }
         BUG_ON(ret);
         item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
                               struct btrfs_file_extent_item);
@@ -218,6 +223,31 @@ fail:
         return ret;
 }
 
+int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
+                        struct btrfs_root *root, struct btrfs_path *path,
+                        u64 isize)
+{
+        struct btrfs_key key;
+        struct btrfs_leaf *leaf = btrfs_buffer_leaf(path->nodes[0]);
+        int slot = path->slots[0];
+        int ret;
+        u32 new_item_size;
+        u64 new_item_span;
+        u64 blocks;
+
+        btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
+        if (isize <= key.offset)
+                return 0;
+        new_item_span = isize - key.offset;
+        blocks = (new_item_span + root->blocksize - 1) / root->blocksize;
+        new_item_size = blocks * BTRFS_CRC32_SIZE;
+        if (new_item_size >= btrfs_item_size(leaf->items + slot))
+                return 0;
+        ret = btrfs_truncate_item(trans, root, path, new_item_size);
+        BUG_ON(ret);
+        return ret;
+}
+
 int btrfs_csum_verify_file_block(struct btrfs_root *root,
                                  u64 objectid, u64 offset,
                                  char *data, size_t len)