From: Anand Jain <Anand.Jain@oracle.com>
To: Ankur Tank <Ankur.Tank@LntTechservices.com>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: btrfs doesn't format eMMC if previous filesystem is ext4
Date: Mon, 29 Dec 2014 10:50:36 +0800 [thread overview]
Message-ID: <54A0C17C.7010009@oracle.com> (raw)
In-Reply-To: <CFB3B8F56DDE9F45B45EBDEBED372A6644232D@POCITMSEXMB05.LntUniverse.com>
On 12/26/2014 11:24 PM, Ankur Tank wrote:
> Hi,
>
> I wanted to test btrfs on the eMMC of beaglebone black based custom board.
> Precondition: eMMC is formatted with ext4 filesystem
> Use case:
> Format eMMC with mkfs.btrfs -L <label> <dev>
> Result:
> Mkfs.btrfs denies formatting eMMC because its existing filesystem
>
> # mkfs.btrfs -L "1storage" /dev/mmcblk0p2
> /dev/mmcblk0p2 appears to contain an existing filesystem (ext4).
> Error: Use the -f option to force overwrite.
>
> If I add "-f" its possible to format the eMMC.
>
> # mkfs.btrfs -f -L "1storage" /dev/mmcblk0p2
> Detected a SSD, turning off metadata duplication. Mkfs with -m dup if you want to force metadata duplication.
> Btrfs v3.17
> See http://btrfs.wiki.kernel.org for more information.
>
> Performing full device TRIM (1.72GiB) ...
> Turning ON incompat feature 'extref': increased hardlink limit per file to 65536
> [273917.692896] btrfs: device label 1storage devid 1 transid 3 /dev/mmcblk0p2
> fs created label 1storage on /dev/mmcblk0p2
> nodesize 16384 leafsize 16384 sectorsize 4096 size 1.72GiB
>
> I had downloaded debian package from following link
> https://packages.debian.org/sid/armhf/btrfs-tools/download
>
> Is it a bug ? or I am missing something ?
I don't see any bug. Can you be more specific ? Thanks.
> Thank you,
>
> Regards,
> Ankur
> L&T Technology Services Ltd
>
> www.LntTechservices.com<http://www.lnttechservices.com/>
>
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next prev parent reply other threads:[~2014-12-29 2:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-26 15:24 btrfs doesn't format eMMC if previous filesystem is ext4 Ankur Tank
2014-12-26 20:05 ` Zygo Blaxell
2014-12-29 2:50 ` Anand Jain [this message]
2014-12-29 7:15 ` Ankur Tank
2014-12-29 9:38 ` Martin Steigerwald
2014-12-29 9:55 ` Ankur Tank
2014-12-29 10:18 ` Martin Steigerwald
2014-12-30 6:53 ` Ankur Tank
2014-12-29 9:55 ` Anand Jain
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