From: Josef Bacik <josef@toxicpanda.com>
Date: Wed, 4 Mar 2020 11:18:26 -0500
Git-commit: 1a0afa0ecfc4dbc8d7583d03cafd3f68f781df0c
Patch-mainline: 5.7-rc1
References: bsc#1176019
Subject: [PATCH] btrfs: free the reloc_control in a consistent way
If we have an error while processing the reloc roots we could leak roots
that were added to rc->reloc_roots before we hit the error. We could
have also not removed the reloc tree mapping from our rb_tree, so clean
up any remaining nodes in the reloc root rb_tree.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ use rbtree_postorder_for_each_entry_safe ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
fs/btrfs/relocation.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 631f94085ba6..a0c8f7949a19 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4202,6 +4202,18 @@ static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
return rc;
}
+static void free_reloc_control(struct reloc_control *rc)
+{
+ struct mapping_node *node, *tmp;
+
+ free_reloc_roots(&rc->reloc_roots);
+ rbtree_postorder_for_each_entry_safe(node, tmp,
+ &rc->reloc_root_tree.rb_root, rb_node)
+ kfree(node);
+
+ kfree(rc);
+}
+
/*
* Print the block group being relocated
*/
@@ -4346,7 +4358,7 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
btrfs_dec_block_group_ro(rc->block_group);
iput(rc->data_inode);
btrfs_put_block_group(rc->block_group);
- kfree(rc);
+ free_reloc_control(rc);
return err;
}
@@ -4522,7 +4534,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
err = ret;
out_unset:
unset_reloc_control(rc);
- kfree(rc);
+ free_reloc_control(rc);
out:
if (!list_empty(&reloc_roots))
free_reloc_roots(&reloc_roots);
--
2.26.2