From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f46.google.com ([209.85.220.46]:46967 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750709Ab2JHJb3 (ORCPT ); Mon, 8 Oct 2012 05:31:29 -0400 Received: by mail-pa0-f46.google.com with SMTP id hz1so3782131pad.19 for ; Mon, 08 Oct 2012 02:31:29 -0700 (PDT) From: Robin Dong To: linux-btrfs@vger.kernel.org Cc: Robin Dong Subject: [PATCH v3 2/2] btrfs-progs: limit the min value of total_bytes Date: Mon, 8 Oct 2012 17:31:20 +0800 Message-Id: <1349688680-28470-1-git-send-email-robin.k.dong@gmail.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Robin Dong Using mkfs.btrfs like: mkfs.btrfs -b 1048576 /dev/sda will report error: mkfs.btrfs: volumes.c:796: btrfs_alloc_chunk: Assertion `!(ret)' failed. Aborted because the length of dev_extent is 4MB. For the single/single case it's 5MB but for the dup/dup it's 156MB. It's due to the known bug in the blockgroup creation with multiple devices (applies on dup as well here) that leads to: # btrfs fi df . System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Data+Metadata, DUP: total=64.00MB, used=24.00KB Data+Metadata: total=8.00MB, used=0.00 8*2 + 4 + 64*2 + 8 = 156 Signed-off-by: Robin Dong Reviewed-by: David Sterba --- mkfs.c | 7 ++++++- utils.h | 1 + 2 files changed, 7 insertions(+), 1 deletions(-) diff --git a/mkfs.c b/mkfs.c index 93672b9..982a113 100644 --- a/mkfs.c +++ b/mkfs.c @@ -1345,7 +1345,12 @@ int main(int ac, char **av) &dev_block_count, &mixed, nodiscard); if (block_count == 0) block_count = dev_block_count; - else if (block_count > dev_block_count) { + else if (block_count < BTRFS_MKFS_SYSTEM_MAX_SIZE) { + fprintf(stderr, "Illegal total number of bytes %u " + "(smaller than %u)\n", + block_count, BTRFS_MKFS_SYSTEM_MAX_SIZE); + exit(1); + } else if (block_count > dev_block_count) { fprintf(stderr, "%s is smaller than requested size\n", file); exit(1); } diff --git a/utils.h b/utils.h index c147c12..b63f69a 100644 --- a/utils.h +++ b/utils.h @@ -20,6 +20,7 @@ #define __UTILS__ #define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024) +#define BTRFS_MKFS_SYSTEM_MAX_SIZE (156 * 1024 * 1024) int make_btrfs(int fd, const char *device, const char *label, u64 blocks[6], u64 num_bytes, u32 nodesize, -- 1.7.3.2