From 3ef5969cd8a42a78ccdbc53f7abb2e6136b2ec65 Mon Sep 17 00:00:00 2001 From: Alexander Block Date: Thu, 8 Nov 2012 21:27:24 +0000 Subject: [PATCH] Btrfs: merge inode_list in __merge_refs When __merge_refs merges two refs, it is also needed to merge the inode_list of both refs. Otherwise we have missed backrefs and memory leaks. This happens for example if two inodes share an extent and both lie in the same leaf and thus also have the same parent. Signed-off-by: Alexander Block Reviewed-by: Jan Schmidt Signed-off-by: Chris Mason --- fs/btrfs/backref.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index a3219523ebc9..04edf69be875 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -461,6 +461,7 @@ static int __merge_refs(struct list_head *head, int mode) pos2 = n2, n2 = pos2->next) { struct __prelim_ref *ref2; struct __prelim_ref *xchg; + struct extent_inode_elem *eie; ref2 = list_entry(pos2, struct __prelim_ref, list); @@ -472,12 +473,20 @@ static int __merge_refs(struct list_head *head, int mode) ref1 = ref2; ref2 = xchg; } - ref1->count += ref2->count; } else { if (ref1->parent != ref2->parent) continue; - ref1->count += ref2->count; } + + eie = ref1->inode_list; + while (eie && eie->next) + eie = eie->next; + if (eie) + eie->next = ref2->inode_list; + else + ref1->inode_list = ref2->inode_list; + ref1->count += ref2->count; + list_del(&ref2->list); kfree(ref2); } -- 2.30.2