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>

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 7a64c19..dce97de 100644 (file)
--- 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;