In f2fs_update_extent_tree, if there is existing extent, f2fs tries to split
it with two parts.
In each trial, __insert_extent_tree checks __is_front/back_mergeable, and then
if it hits to go, there is f2fs_bug_on(!den), which triggers a kernel panic.
Actually, we don't need to check this. Instead, we can do __try_back_merge only
when there exists a den pointer.
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/data.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9bedfa8..7817167 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -519,19 +519,19 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
if (ei->fofs < en->ei.fofs) {
if (__is_front_mergeable(ei, &en->ei)) {
- f2fs_bug_on(sbi, !den);
en->ei.fofs = ei->fofs;
en->ei.blk = ei->blk;
en->ei.len += ei->len;
- *den = __try_back_merge(sbi, et, en);
+ if (den)
+ *den = __try_back_merge(sbi, et, en);
return en;
}
p = &(*p)->rb_left;
} else if (ei->fofs >= en->ei.fofs + en->ei.len) {
if (__is_back_mergeable(ei, &en->ei)) {
- f2fs_bug_on(sbi, !den);
en->ei.len += ei->len;
- *den = __try_front_merge(sbi, et, en);
+ if (den)
+ *den = __try_front_merge(sbi, et, en);
return en;
}
p = &(*p)->rb_right;
--
2.1.1
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