ext4: print 'flags' in ext4_ext_handle_uninitialized_extents

In trace_ext4_ext_handle_uninitialized_extents we don't care about the
value of map->m_flags because this value is probably 0, and we prefer
to get the value of flags because we can know how to handle this
extent in this function.
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/extents.c

@@ -3663,8 +3663,8 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
 		  flags, allocated);
 	ext4_ext_show_leaf(inode, path);
 
-	trace_ext4_ext_handle_uninitialized_extents(inode, map, allocated,
-						    newblock);
+	trace_ext4_ext_handle_uninitialized_extents(inode, map, flags,
+						    allocated, newblock);
 
 	/* get_block() before submit the IO, split the extent */
 	if ((flags & EXT4_GET_BLOCKS_PRE_IO)) {

include/trace/events/ext4.h

@@ -1680,10 +1680,10 @@ DEFINE_EVENT(ext4__trim, ext4_trim_all_free,
 );
 
 TRACE_EVENT(ext4_ext_handle_uninitialized_extents,
-	TP_PROTO(struct inode *inode, struct ext4_map_blocks *map,
+	TP_PROTO(struct inode *inode, struct ext4_map_blocks *map, int flags,
 		 unsigned int allocated, ext4_fsblk_t newblock),
 
-	TP_ARGS(inode, map, allocated, newblock),
+	TP_ARGS(inode, map, flags, allocated, newblock),
 
 	TP_STRUCT__entry(
 		__field(	dev_t,		dev		)
@@ -1699,7 +1699,7 @@ TRACE_EVENT(ext4_ext_handle_uninitialized_extents,
 	TP_fast_assign(
 		__entry->dev		= inode->i_sb->s_dev;
 		__entry->ino		= inode->i_ino;
-		__entry->flags		= map->m_flags;
+		__entry->flags		= flags;
 		__entry->lblk		= map->m_lblk;
 		__entry->pblk		= map->m_pblk;
 		__entry->len		= map->m_len;
@@ -1707,7 +1707,7 @@ TRACE_EVENT(ext4_ext_handle_uninitialized_extents,
 		__entry->newblk		= newblock;
 	),
 
-	TP_printk("dev %d,%d ino %lu m_lblk %u m_pblk %llu m_len %u flags %d"
+	TP_printk("dev %d,%d ino %lu m_lblk %u m_pblk %llu m_len %u flags %x "
 		  "allocated %d newblock %llu",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  (unsigned long) __entry->ino,