[PATCH 3/6] btrfs-progs: Don't report dirty leaked eb using BUG_ON

[Qu Wenruo <wqu@suse.com>]

Another BUG_ON() during fuzz/003:
------
====== RUN MAYFAIL /home/adam/btrfs/btrfs-progs/btrfs check --init-csum-tree /home/adam/btrfs/btrfs-progs/tests//fuzz-tests/images/bko-161821.raw.restored
[1/7] checking root items
Fixed 0 roots.
[2/7] checking extents
parent transid verify failed on 4198400 wanted 14 found 1114126
parent transid verify failed on 4198400 wanted 14 found 1114126
Ignoring transid failure
owner ref check failed [4198400 4096]
repair deleting extent record: key [4198400,169,0]
adding new tree backref on start 4198400 len 4096 parent 0 root 5
Repaired extent references for 4198400
ref mismatch on [4222976 4096] extent item 1, found 0
backref 4222976 root 7 not referenced back 0x5617f8ecf780
incorrect global backref count on 4222976 found 1 wanted 0
backpointer mismatch on [4222976 4096]
owner ref check failed [4222976 4096]
repair deleting extent record: key [4222976,169,0]
Repaired extent references for 4222976
[3/7] checking free space cache
[4/7] checking fs roots
parent transid verify failed on 4198400 wanted 14 found 1114126
Ignoring transid failure
Wrong generation of child node/leaf, wanted: 1114126, have: 14
root 5 missing its root dir, recreating
parent transid verify failed on 4198400 wanted 14 found 1114126
Ignoring transid failure
ERROR: child eb corrupted: parent bytenr=4222976 item=0 parent level=1 child level=2
ERROR: errors found in fs roots
extent buffer leak: start 4222976 len 4096
extent_io.c:611: free_extent_buffer_internal: BUG_ON `eb->flags & EXTENT_DIRTY` triggered, value 1
failed (ignored, ret=134): /home/adam/btrfs/btrfs-progs/btrfs check --init-csum-tree /home/adam/btrfs/btrfs-progs/tests//fuzz-tests/images/bko-161821.raw.restored
mayfail: returned code 134 (SIGABRT), not ignored
test failed for case 003-multi-check-unmounted
------

Since we're shifting to using btrfs_abort_transaction() in btrfs-progs,
it will be more and more common to see dirty leaked eb.
Instead of BUG_ON(), we only needs to report it as warning.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 extent_io.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/extent_io.c b/extent_io.c
index 198492699438..b8510b0ae94e 100644
--- a/extent_io.c
+++ b/extent_io.c
@@ -608,7 +608,11 @@ static void free_extent_buffer_internal(struct extent_buffer *eb, bool free_now)
 	eb->refs--;
 	BUG_ON(eb->refs < 0);
 	if (eb->refs == 0) {
-		BUG_ON(eb->flags & EXTENT_DIRTY);
+		if (eb->flags & EXTENT_DIRTY) {
+			warning(
+			"dirty eb leak (aborted trans): start %llu len %u",
+				eb->start, eb->len);
+		}
 		list_del_init(&eb->recow);
 		if (eb->flags & EXTENT_BUFFER_DUMMY || free_now)
 			free_extent_buffer_final(eb);
-- 
2.18.0