From: Wang Shilong <wangsl-f...@cn.fujitsu.com>
The reason that BUG_ON() happens in these places is just
because of ENOMEM.
We try ro return ENOMEM rather than trigger BUG_ON(), the
caller will abort the transaction thus avoiding the kernel panic.
Signed-off-by: Wang Shilong <wangsl-f...@cn.fujitsu.com>
Reviewed-by: Miao Xie <mi...@cn.fujitsu.com>
Reviewed-by: Jan Schmidt <list.bt...@jan-o-sch.net>
---
Changelog:
V2->V3: correct wrong check about ulist_add()
and revert the check about ret=0
---
fs/btrfs/backref.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index bd605c8..3dd0693 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -900,7 +900,8 @@ again:
if (ref->count && ref->root_id && ref->parent == 0) {
/* no parent == root of tree */
ret = ulist_add(roots, ref->root_id, 0, GFP_NOFS);
- BUG_ON(ret < 0);
+ if (ret < 0)
+ goto out;
}
if (ref->count && ref->parent) {
struct extent_inode_elem *eie = NULL;
@@ -920,6 +921,8 @@ again:
ret = ulist_add_merge(refs, ref->parent,
(uintptr_t)ref->inode_list,
(u64 *)&eie, GFP_NOFS);
+ if (ret < 0)
+ goto out;
if (!ret && extent_item_pos) {
/*
* we've recorded that parent, so we must extend
@@ -930,7 +933,6 @@ again:
eie = eie->next;
eie->next = ref->inode_list;
}
- BUG_ON(ret < 0);
}
kfree(ref);
}
--
1.7.11.7
--
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