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Re: [PATCH 3/4] xfs: Remote attr validation fixes and optimisations

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 3/4] xfs: Remote attr validation fixes and optimisations
From: Ben Myers <bpm@xxxxxxx>
Date: Tue, 30 Apr 2013 16:31:09 -0500
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1367321976-18268-4-git-send-email-david@xxxxxxxxxxxxx>
References: <1367321976-18268-1-git-send-email-david@xxxxxxxxxxxxx> <1367321976-18268-4-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
Hi Dave,

On Tue, Apr 30, 2013 at 09:39:35PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> - optimise the calcuation for the number of blocks in a remote
>   xattr.
> - check attribute length against MAX_XATTR_SIZE, not MAXPATHLEN
> - whitespace fixes
> 
> Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
  Signed-off-by:

I guess this is what you intended?

Else, looks good to me.

Reviewed-by: Ben Myers <bpm@xxxxxxx>

Thanks,
        Ben

> ---
>  fs/xfs/xfs_attr_remote.c |   19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
> 
> diff --git a/fs/xfs/xfs_attr_remote.c b/fs/xfs/xfs_attr_remote.c
> index 53da46b..dee8446 100644
> --- a/fs/xfs/xfs_attr_remote.c
> +++ b/fs/xfs/xfs_attr_remote.c
> @@ -52,15 +52,9 @@ xfs_attr3_rmt_blocks(
>       struct xfs_mount *mp,
>       int             attrlen)
>  {
> -     int             fsblocks = 0;
> -     int             len = attrlen;
> -
> -     do {
> -             fsblocks++;
> -             len -= XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
> -     } while (len > 0);
> -
> -     return fsblocks;
> +     int             buflen = XFS_ATTR3_RMT_BUF_SPACE(mp,
> +                                                      mp->m_sb.sb_blocksize);
> +     return (attrlen + buflen - 1) / buflen;
>  }
>  
>  static bool
> @@ -79,7 +73,7 @@ xfs_attr3_rmt_verify(
>       if (bp->b_bn != be64_to_cpu(rmt->rm_blkno))
>               return false;
>       if (be32_to_cpu(rmt->rm_offset) +
> -                             be32_to_cpu(rmt->rm_bytes) >= MAXPATHLEN)
> +                             be32_to_cpu(rmt->rm_bytes) >= XATTR_SIZE_MAX)
>               return false;
>       if (rmt->rm_owner == 0)
>               return false;
> @@ -183,7 +177,6 @@ xfs_attr3_rmt_hdr_ok(
>  
>       /* ok */
>       return true;
> -
>  }
>  
>  /*
> @@ -367,7 +360,6 @@ xfs_attr_rmtval_set(
>                * spill for another block every 9 headers we require in this
>                * loop.
>                */
> -
>               if (crcs && blkcnt == 0) {
>                       int total_len;
>  
> @@ -422,9 +414,8 @@ xfs_attr_rmtval_set(
>  
>               byte_cnt = BBTOB(bp->b_length);
>               byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, byte_cnt);
> -             if (valuelen < byte_cnt) {
> +             if (valuelen < byte_cnt)
>                       byte_cnt = valuelen;
> -             }
>  
>               buf = bp->b_addr;
>               buf += xfs_attr3_rmt_hdr_set(mp, dp->i_ino, offset,
> -- 
> 1.7.10.4
> 
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