'inode' is an important field for btrfs_get_extent, lets trace it.

Signed-off-by: Liu Bo <bo.li....@oracle.com>
---
 fs/btrfs/inode.c             |  2 +-
 include/trace/events/btrfs.h | 13 ++++++++-----
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 603dd492..79f35b6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7095,7 +7095,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, 
struct page *page,
        write_unlock(&em_tree->lock);
 out:
 
-       trace_btrfs_get_extent(root, em);
+       trace_btrfs_get_extent(root, inode, em);
 
        btrfs_free_path(path);
        if (trans) {
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index e030d6f..0e04208 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -184,14 +184,16 @@ DEFINE_EVENT(btrfs__inode, btrfs_inode_evict,
 
 TRACE_EVENT_CONDITION(btrfs_get_extent,
 
-       TP_PROTO(struct btrfs_root *root, struct extent_map *map),
+       TP_PROTO(struct btrfs_root *root, struct inode *inode,
+                struct extent_map *map),
 
-       TP_ARGS(root, map),
+       TP_ARGS(root, inode, map),
 
        TP_CONDITION(map),
 
        TP_STRUCT__entry_btrfs(
                __field(        u64,  root_objectid     )
+               __field(        u64,  ino               )
                __field(        u64,  start             )
                __field(        u64,  len               )
                __field(        u64,  orig_start        )
@@ -204,7 +206,8 @@ TRACE_EVENT_CONDITION(btrfs_get_extent,
 
        TP_fast_assign_btrfs(root->fs_info,
                __entry->root_objectid  = root->root_key.objectid;
-               __entry->start          = map->start;
+               __entry->ino            = btrfs_ino(inode);
+               __entry->start          = map->start;
                __entry->len            = map->len;
                __entry->orig_start     = map->orig_start;
                __entry->block_start    = map->block_start;
@@ -214,12 +217,12 @@ TRACE_EVENT_CONDITION(btrfs_get_extent,
                __entry->compress_type  = map->compress_type;
        ),
 
-       TP_printk_btrfs("root = %llu(%s), start = %llu, len = %llu, "
+       TP_printk_btrfs("root = %llu(%s), ino = %llu start = %llu, len = %llu, "
                  "orig_start = %llu, block_start = %llu(%s), "
                  "block_len = %llu, flags = %s, refs = %u, "
                  "compress_type = %u",
                  show_root_type(__entry->root_objectid),
-                 (unsigned long long)__entry->start,
+                 __entry->ino, (unsigned long long)__entry->start,
                  (unsigned long long)__entry->len,
                  (unsigned long long)__entry->orig_start,
                  show_map_type(__entry->block_start),
-- 
2.5.5

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