Re: [PATCH] xfs: Remove redundant return error from xfs_difree()

[Jeff Liu <jeff.liu@oracle.com>]

Hi Ben,

On 11/03/2012 05:05 AM, Ben Myers wrote:
> Hey Jeff,
> 
> On Thu, Oct 25, 2012 at 12:28:05PM +0800, Jeff Liu wrote:
>> If we can not fetch the related a.g. info when freeing a disk inode, it mostly like a
>> fatal issue was occurred and with ASSERT(0) is fine, however, return XFS_ERROR(EINVAL)
>> does not make sense here.
>>
>> Signed-off-by: Jie Liu <jeff.liu@oracle.com>
>>
>> ---
>>  fs/xfs/xfs_ialloc.c |    3 ---
>>  1 files changed, 0 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
>> index 445bf1a..b7ea965 100644
>> --- a/fs/xfs/xfs_ialloc.c
>> +++ b/fs/xfs/xfs_ialloc.c
>> @@ -1065,7 +1065,6 @@ xfs_difree(
>>  		xfs_warn(mp, "%s: agno >= mp->m_sb.sb_agcount (%d >= %d).",
>>  			__func__, agno, mp->m_sb.sb_agcount);
>>  		ASSERT(0);
>> -		return XFS_ERROR(EINVAL);
>>  	}
>>  	agino = XFS_INO_TO_AGINO(mp, inode);
>>  	if (inode != XFS_AGINO_TO_INO(mp, agno, agino))  {
>> @@ -1073,14 +1072,12 @@ xfs_difree(
>>  			__func__, (unsigned long long)inode,
>>  			(unsigned long long)XFS_AGINO_TO_INO(mp, agno, agino));
>>  		ASSERT(0);
>> -		return XFS_ERROR(EINVAL);
>>  	}
>>  	agbno = XFS_AGINO_TO_AGBNO(mp, agino);
>>  	if (agbno >= mp->m_sb.sb_agblocks)  {
>>  		xfs_warn(mp, "%s: agbno >= mp->m_sb.sb_agblocks (%d >= %d).",
>>  			__func__, agbno, mp->m_sb.sb_agblocks);
>>  		ASSERT(0);
>> -		return XFS_ERROR(EINVAL);
>>  	}
>>  	/*
>>  	 * Get the allocation group header.
> 
> Here the return of EINVAL is serving a useful purpose.  The ASSERT is only
> activated when xfs debug is configured on, so there is a very real chance that
> you might exercise this code.
Ah, I haven't realized that the ASSERT in XFS is configurable..:(
> 
> My read on this is if you pass bad args to xfs_difree it will return EINVAL.
> It's just a little defensive coding but it's worth keeping.  In this case it
> will result in forced shutdown of the filesystem, which is much better than the
> [unspecified] baddness that could happen later in xfs_difree if you have passed
> in garbage args.
Definitely.
> 
> There... I got my FUD in for the day.  ;)
Sorry for my false alarm, and thanks your for your teaching!

Regards,
-Jeff

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