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btrfs: hold a ref on the root on the dead roots list
At the point we add a root to the dead roots list we have no open inodes for that root, so we need to hold a ref on that root to keep it from disappearing. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -2035,8 +2035,7 @@ void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
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if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
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btrfs_drop_and_free_fs_root(fs_info, gang[0]);
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else
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btrfs_put_root(gang[0]);
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btrfs_put_root(gang[0]);
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}
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while (1) {
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@ -1264,8 +1264,10 @@ void btrfs_add_dead_root(struct btrfs_root *root)
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struct btrfs_fs_info *fs_info = root->fs_info;
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spin_lock(&fs_info->trans_lock);
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if (list_empty(&root->root_list))
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if (list_empty(&root->root_list)) {
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btrfs_grab_root(root);
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list_add_tail(&root->root_list, &fs_info->dead_roots);
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}
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spin_unlock(&fs_info->trans_lock);
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}
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@ -2435,6 +2437,7 @@ int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
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else
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ret = btrfs_drop_snapshot(root, 1, 0);
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btrfs_put_root(root);
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return (ret < 0) ? 0 : 1;
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}
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