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authorLiu Bo <bo.li.liu@oracle.com>2018-01-05 22:51:16 +0300
committerDavid Sterba <dsterba@suse.com>2018-03-26 16:09:38 +0300
commit393da91819e35af538ef97c7c6a04899e2fbfe0e (patch)
tree9a81e6d1a4aa4fb32a876098f0121f38bf726987 /fs/btrfs/extent_map.c
parent5d23515be66904fa3b1b5d6bd72d2199cd2447ab (diff)
downloadlinux-393da91819e35af538ef97c7c6a04899e2fbfe0e.tar.xz
Btrfs: add tracepoint for em's EEXIST case
This is adding a tracepoint 'btrfs_handle_em_exist' to help debug the subtle bugs around merge_extent_mapping. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/extent_map.c')
-rw-r--r--fs/btrfs/extent_map.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index c80dea7c69af..b8ead8dc2ebe 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -551,6 +551,9 @@ int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
ret = 0;
existing = search_extent_mapping(em_tree, start, len);
+
+ trace_btrfs_handle_em_exist(existing, em, start, len);
+
/*
* existing will always be non-NULL, since there must be
* extent causing the -EEXIST.