From: Josef Bacik <josef@toxicpanda.com>
Date: Fri, 24 Jan 2020 09:32:39 -0500
Git-commit: db2c2ca2db44e4971ec41d3245119f7bc9d25d37
Patch-mainline: 5.7-rc1
References: bsc#1176019
Subject: [PATCH] btrfs: hold a ref on the root in prepare_to_merge
We look up the reloc roots corresponding root, we need to hold a ref on
that root.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
fs/btrfs/relocation.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 83fd74cade3b..b85850823a1b 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2521,6 +2521,7 @@ int prepare_to_merge(struct reloc_control *rc, int err)
root = read_fs_root(fs_info, reloc_root->root_key.offset);
BUG_ON(IS_ERR(root));
+ BUG_ON(!btrfs_grab_fs_root(root));
BUG_ON(root->reloc_root != reloc_root);
/*
@@ -2532,6 +2533,7 @@ int prepare_to_merge(struct reloc_control *rc, int err)
btrfs_update_reloc_root(trans, root);
list_add(&reloc_root->root_list, &reloc_roots);
+ btrfs_put_fs_root(root);
}
list_splice(&reloc_roots, &rc->reloc_roots);
--
2.26.2