From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([222.73.24.84]:45349 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752939AbcCWDku (ORCPT ); Tue, 22 Mar 2016 23:40:50 -0400 Received: from localhost.localdomain (unknown [10.167.226.34]) by cn.fujitsu.com (Postfix) with ESMTP id 6C33A4056401 for ; Wed, 23 Mar 2016 11:40:24 +0800 (CST) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH] btrfs: Output more info for enospc_debug mount option Date: Wed, 23 Mar 2016 11:38:17 +0800 Message-Id: <1458704297-21800-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: As one user in mail list report reproducible balance ENOSPC error, it's better to add more debug info for enospc_debug mount option. Reported-by: Marc Haber Signed-off-by: Qu Wenruo --- changelog: v2: Add output for block group bytenr --- fs/btrfs/extent-tree.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 53e1297..8507484 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -9386,15 +9386,23 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) u64 dev_min = 1; u64 dev_nr = 0; u64 target; + int debug; int index; int full = 0; int ret = 0; + debug = btrfs_test_opt(root, ENOSPC_DEBUG); + block_group = btrfs_lookup_block_group(root->fs_info, bytenr); /* odd, couldn't find the block group, leave it alone */ - if (!block_group) + if (!block_group) { + if (debug) + btrfs_warn(root->fs_info, + "can't find block group for bytenr %llu", + bytenr); return -1; + } min_free = btrfs_block_group_used(&block_group->item); @@ -9448,8 +9456,13 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) * this is just a balance, so if we were marked as full * we know there is no space for a new chunk */ - if (full) + if (full) { + if (debug) + btrfs_warn(root->fs_info, + "no space to alloc new chunk for block group %llu", + block_group->key.objectid); goto out; + } index = get_block_group_index(block_group); } @@ -9496,6 +9509,10 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr) ret = -1; } } + if (debug && ret == -1) + btrfs_warn(root->fs_info, + "no space to allocate a new chunk for block group %llu", + block_group->key.objectid); mutex_unlock(&root->fs_info->chunk_mutex); btrfs_end_transaction(trans, root); out: -- 2.7.4