linux-ext4 - Re: [PATCH] xfstests: add support for ext4dev FSTYP

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Message-ID: <BANLkTikfjitncM=zLpfTrfQkd8VfQAxbUA@mail.gmail.com>
Date:	Wed, 1 Jun 2011 07:56:45 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	XFS <xfs@....sgi.com>, Sergey Ivanov <sergey57@...il.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] xfstests: add support for ext4dev FSTYP

On Wed, Jun 1, 2011 at 7:37 AM, Eric Sandeen <sandeen@...hat.com> wrote:
> On 5/31/11 10:13 PM, Amir Goldstein wrote:
>> From: Amir Goldstein <amir73il@...rs.sf.net>
>>
>> blkid knows to identify the ext4dev FSTYP of a partition that was
>> formatted with mkfs.ext4dev.
>> quota tools and various util-linux utils are also aware of ext4dev,
>> so ext4dev shares the same capabilities as ext4.
>>
>> While testing on Fedora 15, we encoutered a buggy fsck utility, which
>> invokes fsck.ext4, even though it was called with -t ext4dev argument.
>> In our setup fsck.ext4dev knows about new fs features that fsck.ext4
>> doesn't know, so the generic_fs_check fails.
>> Since we have no real use of the extra capabilities provided by fsck util,
>> we decided to invoke fsck.$FSTYP directly to avoid this issue.
>
> Adding ext4dev to every case seems harmless enough.  TBH I thought I had
> it there already but I guess not.
>
> I'm less certain of the change from fsck -t $FSTYP to fsck.$FSTYP
>
> What issue are you avoiding?  wouldn't fsck -t ext4dev invoke fsck.ext4dev anyway?
>
> It seems like it should be harmless, but I don't understand how it helps you.
>

As I wrote in the patch description, the fsck utility in Fedora 15 invokes
fsck.ext4 for some reason when calling fsck -t ext4dev.
this fails because fsck.ext4 doesn't know the snapshot feature.
I didn't debug fsck utility for that. it seemed pointless.

> Thanks,
> -Eric
>
>> Signed-off-by: Amir Goldstein <amir73il@...rs.sf.net>
>> Tested-by: Sergey Ivanov <sergey57@...il.com>
>> ---
>> ext4dev is used to test experimental ext4 code in mutual existance
>> with production ext4 code on the same system.
>>
>> Specifically, ext4 snapshots code is available for testing as a
>> stand-alone ext4dev module for Fedora 15 and Ubuntu 11.4
>> (see http://next3.sf.net).
>>
>>  common.defrag |    2 +-
>>  common.quota  |    4 ++--
>>  common.rc     |   12 ++++++------
>>  3 files changed, 9 insertions(+), 9 deletions(-)
>>
>> diff --git a/common.defrag b/common.defrag
>> index 1bcf01d..4850803 100644
>> --- a/common.defrag
>> +++ b/common.defrag
>> @@ -26,7 +26,7 @@ _require_defrag()
>>      xfs)
>>          DEFRAG_PROG=/usr/sbin/xfs_fsr
>>       ;;
>> -    ext4)
>> +    ext4|ext4dev)
>>          DEFRAG_PROG=/usr/bin/e4defrag
>>       ;;
>>      *)
>> diff --git a/common.quota b/common.quota
>> index 3c87ce1..9eac19d 100644
>> --- a/common.quota
>> +++ b/common.quota
>> @@ -29,7 +29,7 @@ _require_quota()
>>      [ -n $QUOTA_PROG ] || _notrun "Quota user tools not installed"
>>
>>      case $FSTYP in
>> -    ext2|ext3|ext4|reiserfs)
>> +    ext2|ext3|ext4|ext4dev|reiserfs)
>>       if [ ! -d /proc/sys/fs/quota ]; then
>>           _notrun "Installed kernel does not support quotas"
>>       fi
>> @@ -237,7 +237,7 @@ _check_quota_usage()
>>       # Sync to get delalloc to disk
>>       sync
>>       VFS_QUOTA=0
>> -     if [ $FSTYP = "ext2" -o $FSTYP = "ext3" -o $FSTYP = "ext4" -o $FSTYP
>> = "reiserfs" ]; then
>> +     if [ $FSTYP = "ext2" -o $FSTYP = "ext3" -o $FSTYP = "ext4" -o $FSTYP
>> = "ext4dev" -o $FSTYP = "reiserfs" ]; then
>>               VFS_QUOTA=1
>>               quotaon -f -u -g $SCRATCH_MNT 2>/dev/null
>>       fi
>> diff --git a/common.rc b/common.rc
>> index e634fbb..e71fe9c 100644
>> --- a/common.rc
>> +++ b/common.rc
>> @@ -65,7 +65,7 @@ _mount_opts()
>>      nfs)
>>       export MOUNT_OPTIONS=$NFS_MOUNT_OPTIONS
>>       ;;
>> -    ext2|ext3|ext4)
>> +    ext2|ext3|ext4|ext4dev)
>>       # acls & xattrs aren't turned on by default on ext$FOO
>>       export MOUNT_OPTIONS="-o acl,user_xattr $EXT_MOUNT_OPTIONS"
>>       ;;
>> @@ -110,7 +110,7 @@ _mkfs_opts()
>>  _fsck_opts()
>>  {
>>      case $FSTYP in
>> -    ext2|ext3|ext4)
>> +    ext2|ext3|ext4|ext4dev)
>>       export FSCK_OPTIONS="-nf"
>>       ;;
>>      reiserfs)
>> @@ -326,10 +326,10 @@ _scratch_mkfs_sized()
>>      xfs)
>>       _scratch_mkfs_xfs -d size=$fssize -b size=$blocksize
>>       ;;
>> -    ext2|ext3|ext4)
>> +    ext2|ext3|ext4|ext4dev)
>>       /sbin/mkfs.$FSTYP $MKFS_OPTIONS -b $blocksize $SCRATCH_DEV $blocks
>>       ;;
>> -     btrfs)
>> +    btrfs)
>>       /sbin/mkfs.$FSTYP $MKFS_OPTIONS $SCRATCH_DEV -b $fssize
>>       ;;
>>      *)
>> @@ -354,7 +354,7 @@ _scratch_mkfs_geom()
>>      xfs)
>>       MKFS_OPTIONS+=" -b size=$blocksize, -d su=$sunit_bytes,sw=$swidth_mult"
>>       ;;
>> -    ext4)
>> +    ext4|ext4dev)
>>       MKFS_OPTIONS+=" -b $blocksize -E
>> stride=$sunit_blocks,stripe_width=$swidth_blocks"
>>       ;;
>>      *)
>> @@ -1026,7 +1026,7 @@ _check_generic_filesystem()
>>          mountpoint=`_umount_or_remount_ro $device`
>>      fi
>>
>> -    fsck -t $FSTYP $FSCK_OPTIONS $device >$tmp.fsck 2>&1
>> +    fsck.$FSTYP $FSCK_OPTIONS $device >$tmp.fsck 2>&1
>>      if [ $? -ne 0 ]
>>      then
>>          echo "_check_generic_filesystem: filesystem on $device is
>> inconsistent (see $seq.full)"
>
>
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