From patchwork Tue Sep 14 09:05:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikolay Borisov X-Patchwork-Id: 12492505 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 882A7C433F5 for ; Tue, 14 Sep 2021 09:06:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E0466113E for ; Tue, 14 Sep 2021 09:06:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231543AbhINJHX (ORCPT ); Tue, 14 Sep 2021 05:07:23 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:42010 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230506AbhINJHT (ORCPT ); Tue, 14 Sep 2021 05:07:19 -0400 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id A115E200E0; Tue, 14 Sep 2021 09:06:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1631610361; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iBhQfNstU4BmU2perA7RNHxjovVx3JqoBj1xNXS7C60=; b=LVIkFbrx9EL6mOwDW3hQ907gLb+jldK26fKjrVbtMGZw2ataastDmyydBgmF0Y6Tysq/Nx I/As+bwbqnNKluZGoVX8oIz8xvlrWjBluFlgUnKsejcIG7FM2+vOKiVNobTtr80FcTAuUA Wm16Oj+M3m8NfMygtR/m1WL/S9+eUjE= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 655CA13D3F; Tue, 14 Sep 2021 09:06:01 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id ELk0FvllQGH5NwAAMHmgww (envelope-from ); Tue, 14 Sep 2021 09:06:01 +0000 From: Nikolay Borisov To: linux-btrfs@vger.kernel.org Cc: Nikolay Borisov Subject: [PATCH v2 5/8] btrfs-progs: Add btrfs_uuid_tree_remove Date: Tue, 14 Sep 2021 12:05:55 +0300 Message-Id: <20210914090558.79411-6-nborisov@suse.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210914090558.79411-1-nborisov@suse.com> References: <20210914090558.79411-1-nborisov@suse.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org It will be used to clear received data on RW snapshots that were received. Signed-off-by: Nikolay Borisov Reviewed-by: Qu Wenruo --- kernel-shared/ctree.h | 3 ++ kernel-shared/uuid-tree.c | 82 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+) diff --git a/kernel-shared/ctree.h b/kernel-shared/ctree.h index 91a85796a678..158281a9fd67 100644 --- a/kernel-shared/ctree.h +++ b/kernel-shared/ctree.h @@ -2860,6 +2860,9 @@ int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, u64 subvol_id_cpu); int btrfs_is_empty_uuid(u8 *uuid); +int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, + u64 subid); + static inline int is_fstree(u64 rootid) { diff --git a/kernel-shared/uuid-tree.c b/kernel-shared/uuid-tree.c index 51a7b5d9ff5d..0f0fbf667dda 100644 --- a/kernel-shared/uuid-tree.c +++ b/kernel-shared/uuid-tree.c @@ -120,3 +120,85 @@ int btrfs_is_empty_uuid(u8 *uuid) } return 1; } + +int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, + u64 subid) +{ + struct btrfs_fs_info *fs_info = trans->fs_info; + struct btrfs_root *uuid_root = fs_info->uuid_root; + int ret; + struct btrfs_path *path = NULL; + struct btrfs_key key; + struct extent_buffer *eb; + int slot; + unsigned long offset; + u32 item_size; + unsigned long move_dst; + unsigned long move_src; + unsigned long move_len; + + if (!uuid_root) { + ret = -EINVAL; + goto out; + } + + btrfs_uuid_to_key(uuid, &key); + key.type = type; + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } + + ret = btrfs_search_slot(trans, uuid_root, &key, path, -1, 1); + if (ret < 0) { + warning("error %d while searching for uuid item!", ret); + goto out; + } + if (ret > 0) { + ret = -ENOENT; + goto out; + } + + + eb = path->nodes[0]; + slot = path->slots[0]; + offset = btrfs_item_ptr_offset(eb, slot); + item_size = btrfs_item_size_nr(eb, slot); + if (!IS_ALIGNED(item_size, sizeof(u64))) { + warning("uuid item with illegal size %lu!", (unsigned long)item_size); + ret = -ENOENT; + goto out; + } + while (item_size) { + __le64 read_subid; + + read_extent_buffer(eb, &read_subid, offset, sizeof(read_subid)); + if (le64_to_cpu(read_subid) == subid) + break; + offset += sizeof(read_subid); + item_size -= sizeof(read_subid); + } + + if (!item_size) { + ret = -ENOENT; + goto out; + } + + item_size = btrfs_item_size_nr(eb, slot); + if (item_size == sizeof(subid)) { + ret = btrfs_del_item(trans, uuid_root, path); + goto out; + } + + move_dst = offset; + move_src = offset + sizeof(subid); + move_len = item_size - (move_src - btrfs_item_ptr_offset(eb, slot)); + memmove_extent_buffer(eb, move_dst, move_src, move_len); + btrfs_truncate_item(path, item_size - sizeof(subid), 1); + +out: + btrfs_free_path(path); + return ret; +}