Re: [PATCH v7 02/19] xfs: Embed struct xfs_name in xfs_da_args

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On Sun, Feb 23, 2020 at 6:51 PM Allison Collins
<allison.henderson@xxxxxxxxxx> wrote:
>
>
>
> On 2/23/20 4:54 AM, Amir Goldstein wrote:
> > On Sun, Feb 23, 2020 at 4:07 AM Allison Collins
> > <allison.henderson@xxxxxxxxxx> wrote:
> >>
> >> This patch embeds an xfs_name in xfs_da_args, replacing the name, namelen, and flags
> >> members.  This helps to clean up the xfs_da_args structure and make it more uniform
> >> with the new xfs_name parameter being passed around.
> >>
> >> Signed-off-by: Allison Collins <allison.henderson@xxxxxxxxxx>
> >> Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> >> ---
> >>   fs/xfs/libxfs/xfs_attr.c        |  37 +++++++-------
> >>   fs/xfs/libxfs/xfs_attr_leaf.c   | 104 +++++++++++++++++++++-------------------
> >>   fs/xfs/libxfs/xfs_attr_remote.c |   2 +-
> >>   fs/xfs/libxfs/xfs_da_btree.c    |   6 ++-
> >>   fs/xfs/libxfs/xfs_da_btree.h    |   4 +-
> >>   fs/xfs/libxfs/xfs_dir2.c        |  18 +++----
> >>   fs/xfs/libxfs/xfs_dir2_block.c  |   6 +--
> >>   fs/xfs/libxfs/xfs_dir2_leaf.c   |   6 +--
> >>   fs/xfs/libxfs/xfs_dir2_node.c   |   8 ++--
> >>   fs/xfs/libxfs/xfs_dir2_sf.c     |  30 ++++++------
> >>   fs/xfs/scrub/attr.c             |  12 ++---
> >>   fs/xfs/xfs_trace.h              |  20 ++++----
> >>   12 files changed, 130 insertions(+), 123 deletions(-)
> >>
> >> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> >> index 6717f47..9acdb23 100644
> >> --- a/fs/xfs/libxfs/xfs_attr.c
> >> +++ b/fs/xfs/libxfs/xfs_attr.c
> >> @@ -72,13 +72,12 @@ xfs_attr_args_init(
> >>          args->geo = dp->i_mount->m_attr_geo;
> >>          args->whichfork = XFS_ATTR_FORK;
> >>          args->dp = dp;
> >> -       args->flags = flags;
> >> -       args->name = name->name;
> >> -       args->namelen = name->len;
> >> -       if (args->namelen >= MAXNAMELEN)
> >> +       memcpy(&args->name, name, sizeof(struct xfs_name));
> >
> > Maybe xfs_name_copy and xfs_name_equal are in order?
> You are suggesting to add xfs_name_copy and xfs_name_equal helpers?  I'm
> not sure there's a use case yet for xfs_name_equal, at least not in this
> set.  And I think people indicated that they preferred the memcpy in
> past reviews rather than handling each member of the xfs_name struct.
> Unless I misunderstood the question, I'm not sure there is much left for
> a xfs_name_copy helper to cover that the memcpy does not?
>

It's fine. The choice between xfs_name_copy and memcpy is
mostly personal taste. I did not read through past reviews.

> >
> >>
> >> +       /* Use name now stored in args */
> >> +       name = &args.name;
> >> +
> >
> > It seem that the context of these comments be clear in the future.
> You are asking to add more context to the comment?  How about:
>         /*
>          * Use name now stored in args.  Abandon the local name
>          * parameter as it will not be updated in the subroutines
>          */
>
> Does that help some?

Can't you just not use local name arg anymore?
Instead of re-assigning it and explaining why you do that.
Does that gain anything to code readability or anything else?

Thanks,
Amir.



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