linux-ext4 - Re: [PATCH 08/25] debugfs: fix various minor bogosity

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Date:	Mon, 25 Nov 2013 10:05:37 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, Darren Hart <dvhart@...ux.intel.com>,
	linux-ext4@...r.kernel.org, Robert Yang <liezhi.yang@...driver.com>
Subject: Re: [PATCH 08/25] debugfs: fix various minor bogosity

On Mon, Nov 25, 2013 at 04:08:24PM +0800, Zheng Liu wrote:
> On Thu, Oct 17, 2013 at 09:49:48PM -0700, Darrick J. Wong wrote:
> > We should really use the ext2fs memory allocator functions in
> > copy_file(), and we really should return a value if there's allocation
> > problems.
> > 
> > Also fix up a minor bogosity in an error message.
> > 
> > Cc: Robert Yang <liezhi.yang@...driver.com>
> > Cc: Darren Hart <dvhart@...ux.intel.com>
> > Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> 
> Two places are missing to be fixed.  Otherwise the patch looks good to
> me.
> Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
> 
>                                                 - Zheng
> 
> diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
> index d3db356..cc8dd20 100644
> --- a/debugfs/debugfs.c
> +++ b/debugfs/debugfs.c
> @@ -1611,7 +1611,7 @@ static errcode_t copy_file(int fd, ext2_ino_t newfile, int bufsize, int make_hol
>  	retval = ext2fs_get_memzero(bufsize, &zero_buf);
>  	if (retval) {
>  		com_err("copy_file", retval, "can't allocate buffer\n");
> -		free(buf);
> +		ext2fs_free_mem(&buf);
>  		return retval;
>  	}
>  
> @@ -1649,7 +1649,7 @@ static errcode_t copy_file(int fd, ext2_ino_t newfile, int bufsize, int make_hol
>  			ptr += written;
>  		}
>  	}
> -	free(buf);
> +	ext2fs_free_mem(&buf);
>  	ext2fs_free_mem(&zero_buf);
>  	retval = ext2fs_file_close(e2_file);
>  	return retval;

Good catch.  I'll update the patch.

--D

> 
> > ---
> >  debugfs/debugfs.c |   11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> > 
> > 
> > diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
> > index 4f6108d..d3db356 100644
> > --- a/debugfs/debugfs.c
> > +++ b/debugfs/debugfs.c
> > @@ -1601,9 +1601,10 @@ static errcode_t copy_file(int fd, ext2_ino_t newfile, int bufsize, int make_hol
> >  	if (retval)
> >  		return retval;
> >  
> > -	if (!(buf = (char *) malloc(bufsize))){
> > -		com_err("copy_file", errno, "can't allocate buffer\n");
> > -		return;
> > +	retval = ext2fs_get_mem(bufsize, &buf);
> > +	if (retval) {
> > +		com_err("copy_file", retval, "can't allocate buffer\n");
> > +		return retval;
> >  	}
> >  
> >  	/* This is used for checking whether the whole block is zero */
> > @@ -1654,7 +1655,7 @@ static errcode_t copy_file(int fd, ext2_ino_t newfile, int bufsize, int make_hol
> >  	return retval;
> >  
> >  fail:
> > -	free(buf);
> > +	ext2fs_free_mem(&buf);
> >  	ext2fs_free_mem(&zero_buf);
> >  	(void) ext2fs_file_close(e2_file);
> >  	return retval;
> > @@ -2112,7 +2113,7 @@ void do_bmap(int argc, char *argv[])
> >  
> >  	errcode = ext2fs_bmap2(current_fs, ino, 0, 0, 0, blk, 0, &pblk);
> >  	if (errcode) {
> > -		com_err("argv[0]", errcode,
> > +		com_err(argv[0], errcode,
> >  			"while mapping logical block %llu\n", blk);
> >  		return;
> >  	}
> > 
> > --
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