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btrfs: hold a ref on the root in prepare_to_merge

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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>
This commit is contained in:
Josef Bacik
2020-01-24 09:32:39 -05:00
committed by David Sterba
parent 0b530bc5e1
commit db2c2ca2db
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/relocation.c
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@@ -2521,6 +2521,7 @@ again:
root = read_fs_root(fs_info, reloc_root->root_key.offset); root = read_fs_root(fs_info, 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);
/* /*
@@ -2532,6 +2533,7 @@ again:
btrfs_update_reloc_root(trans, root); btrfs_update_reloc_root(trans, root);
list_add(&reloc_root->root_list, &reloc_roots); list_add(&reloc_root->root_list, &reloc_roots);
btrfs_put_fs_root(root);
} }
list_splice(&reloc_roots, &rc->reloc_roots); list_splice(&reloc_roots, &rc->reloc_roots);