linux-kernel - Re: [PATCH RFC 11/13] md/bitmap: simplify the printing with '%pD' specifier

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Date:   Fri, 23 Jul 2021 10:05:14 -0700
From:   Song Liu <song@...nel.org>
To:     Guoqing Jiang <guoqing.jiang@...ux.dev>
Cc:     Jia He <justin.he@....com>,
        open list <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>, nd@....com,
        linux-raid <linux-raid@...r.kernel.org>
Subject: Re: [PATCH RFC 11/13] md/bitmap: simplify the printing with '%pD' specifier

On Fri, Jul 16, 2021 at 2:41 AM Guoqing Jiang <guoqing.jiang@...ux.dev> wrote:
>
>
>
> On 7/15/21 11:15 AM, Jia He wrote:
> > After the behavior of '%pD' is changed to print the full path of file,
> > the log printing can be simplified.
> >
> > Given the space with proper length would be allocated in vprintk_store(),
> > it is worthy of dropping kmalloc()/kfree() to avoid additional space
> > allocation. The error case is well handled in d_path_unsafe(), the error
> > string would be copied in '%pD' buffer, no need to additionally handle
> > IS_ERR().
> >
> > Cc: Song Liu <song@...nel.org>
> > Cc: linux-raid@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > Signed-off-by: Jia He <justin.he@....com>
> > ---
> >   drivers/md/md-bitmap.c | 13 ++-----------
> >   1 file changed, 2 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
> > index e29c6298ef5c..a82f1c2ef83c 100644
> > --- a/drivers/md/md-bitmap.c
> > +++ b/drivers/md/md-bitmap.c
> > @@ -862,21 +862,12 @@ static void md_bitmap_file_unmap(struct bitmap_storage *store)
> >    */
> >   static void md_bitmap_file_kick(struct bitmap *bitmap)
> >   {
> > -     char *path, *ptr = NULL;
> > -
> >       if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
> >               md_bitmap_update_sb(bitmap);
> >
> >               if (bitmap->storage.file) {
> > -                     path = kmalloc(PAGE_SIZE, GFP_KERNEL);
> > -                     if (path)
> > -                             ptr = file_path(bitmap->storage.file,
> > -                                          path, PAGE_SIZE);
> > -
> > -                     pr_warn("%s: kicking failed bitmap file %s from array!\n",
> > -                             bmname(bitmap), IS_ERR(ptr) ? "" : ptr);
> > -
> > -                     kfree(path);
> > +                     pr_warn("%s: kicking failed bitmap file %pD from array!\n",
> > +                             bmname(bitmap), bitmap->storage.file);

This is neat!

Acked-by: Song Liu <song@...nel.org>




> >               } else
> >                       pr_warn("%s: disabling internal bitmap due to errors\n",
> >                               bmname(bitmap));
>
> Looks good,  Acked-by: Guoqing Jiang <guoqing.jiang@...ux.dev>