ext4: fix missing call to trace_ext4_ext_map_blocks_exit

When ext4_ext_handle_uninitialized_extents(), we will directly return
from ext4_ext_map_blocks().  The trace point of
trace_ext4_ext_map_blocks_exit isn't called, and the user doesn't see
any result.  This patch tries to fix this problem.

Meanwhile in ext4_ext_handle_uninitialized_extents it returns errors
or the number of allocated blocks.  So 'ret' variable can be removed
due to previously modifications.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 7a64c193b2af..dce97de6a409 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3911,7 +3911,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
         struct ext4_extent newex, *ex, *ex2;
         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
         ext4_fsblk_t newblock = 0;
-        int free_on_err = 0, err = 0, depth, ret;
+        int free_on_err = 0, err = 0, depth;
         unsigned int allocated = 0, offset = 0;
         unsigned int allocated_clusters = 0;
         struct ext4_allocation_request ar;
@@ -4007,10 +4007,10 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
                                         ee_len, ee_start);
                                 goto out;
                         }
-                        ret = ext4_ext_handle_uninitialized_extents(
+                        allocated = ext4_ext_handle_uninitialized_extents(
                                 handle, inode, map, path, flags,
                                 allocated, newblock);
-                        return ret;
+                        goto out3;
                 }
         }
 
@@ -4284,6 +4284,7 @@ out2:
                 kfree(path);
         }
 
+out3:
         trace_ext4_ext_map_blocks_exit(inode, map, err ? err : allocated);
 
         return err ? err : allocated;