From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.synology.com ([59.124.41.242]:45826 "EHLO mail.synology.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753887AbbFWKj7 (ORCPT ); Tue, 23 Jun 2015 06:39:59 -0400 From: Robbie Ko To: linux-btrfs@vger.kernel.org Cc: Robbie Ko Subject: [PATCH v3 5/7] Btrfs: incremental send, fix rmdir but dir have a unprocess item Date: Tue, 23 Jun 2015 18:39:49 +0800 Message-Id: <1435055991-10109-6-git-send-email-robbieko@synology.com> In-Reply-To: <1435055991-10109-1-git-send-email-robbieko@synology.com> References: <1435055991-10109-1-git-send-email-robbieko@synology.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: There's one case where we attempt to rmdir a directory prematurely. Example: Parent snapshot: |---- a/ (ino 279) |---- c (ino 282) |---- del/ (ino 281) |---- tmp/ (ino 280) |---- long/ (ino 283) Send snapshot: |---- a/ (ino 279) |---- long (ino 283) |---- c/ (ino 282) |---- tmp/ (ino 280) While process inode 281, since inode 280 is waiting for inode 282, rmdir_ino of struct waitng_dir_move for inode 280 will assigned to 281 and an orphan_dir_info will be created for node 281 in can_rmdir(). Such that, when process inode 282, we will do following steps. First, move inode 282 from a/c to c Second, move inode 280 from del/tmp to c/tmp Third, try to remove inode 281 In Third step, we pass 283 (sctx->cur_ino + 1) as the send_progress to the can_rmdir() function and that makes it return true when it shouldn't, because the inode 283 wasn't processed yet and it's still a child of the directory with inode number 281, which makes the receiver run into an ENOTEMPTY error when attempting to remove the directory. Signed-off-by: Robbie Ko --- fs/btrfs/send.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 194df76..838abf4 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -3211,7 +3211,7 @@ static int apply_dir_move(struct send_ctx *sctx, struct pending_dir_move *pm) /* already deleted */ goto finish; } - ret = can_rmdir(sctx, rmdir_ino, odi->gen, sctx->cur_ino + 1); + ret = can_rmdir(sctx, rmdir_ino, odi->gen, sctx->cur_ino); if (ret < 0) goto out; if (!ret) -- 1.9.1