Re: [PATCH 2/3] xfs: clean up xfs_bui_item_recover iget/trans_alloc/ilock ordering

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On Wed, Sep 16, 2020 at 08:29:36PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> 
> In most places in XFS, we have a specific order in which we gather
> resources: grab the inode, allocate a transaction, then lock the inode.
> xfs_bui_item_recover doesn't do it in that order, so fix it to be more
> consistent.  This also makes the error bailout code a bit less weird.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
>  fs/xfs/xfs_bmap_item.c |   40 +++++++++++++++++++++-------------------
>  1 file changed, 21 insertions(+), 19 deletions(-)

This probably needs to go before the xfs_qm_dqattach() fix, or
the dqattach fix need to come after this....

> 
> 
> diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
> index 877afe76d76a..6f589f04f358 100644
> --- a/fs/xfs/xfs_bmap_item.c
> +++ b/fs/xfs/xfs_bmap_item.c
> @@ -475,25 +475,26 @@ xfs_bui_item_recover(
>  	    (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS))
>  		goto garbage;
>  
> -	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
> -			XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
> -	if (error)
> -		return error;
> -
> -	budp = xfs_trans_get_bud(tp, buip);
> -
>  	/* Grab the inode. */
> -	error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip);
> +	error = xfs_iget(mp, NULL, bmap->me_owner, 0, 0, &ip);
>  	if (error)
> -		goto err_inode;
> +		return error;
>  
>  	error = xfs_qm_dqattach(ip);
>  	if (error)
> -		goto err_inode;
> +		goto err_rele;
>  
>  	if (VFS_I(ip)->i_nlink == 0)
>  		xfs_iflags_set(ip, XFS_IRECOVERY);
>  
> +	/* Allocate transaction and do the work. */
> +	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
> +			XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
> +	if (error)
> +		goto err_rele;

Hmmmm - don't all the error cased before we call xfs_trans_get_bud()
need to release the bui?

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx



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