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btrfs: hold a ref on the root in merge_reloc_roots

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We look up the corresponding root for the reloc root, we need to hold a
ref while we're messing with it.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik
2020-01-24 09:32:40 -05:00
committed by David Sterba
parent db2c2ca2db
commit ab9737bd75
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/relocation.c
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@@ -2592,9 +2592,11 @@ again:
root = read_fs_root(fs_info, root = read_fs_root(fs_info,
reloc_root->root_key.offset); reloc_root->root_key.offset);
BUG_ON(IS_ERR(root)); BUG_ON(IS_ERR(root));
BUG_ON(!btrfs_grab_fs_root(root));
BUG_ON(root->reloc_root != reloc_root); BUG_ON(root->reloc_root != reloc_root);
ret = merge_reloc_root(rc, root); ret = merge_reloc_root(rc, root);
btrfs_put_fs_root(root);
if (ret) { if (ret) {
if (list_empty(&reloc_root->root_list)) if (list_empty(&reloc_root->root_list))
list_add_tail(&reloc_root->root_list, list_add_tail(&reloc_root->root_list,