linux-ext4 - Re: [PATCH 2/2] mmp: abstract out repeated 'sizeof(buf), buf' usage

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Message-ID: <20200125064356.GB1108497@mit.edu>
Date:   Sat, 25 Jan 2020 01:43:56 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] mmp: abstract out repeated 'sizeof(buf), buf' usage

On Tue, Jan 14, 2020 at 02:42:18PM -0700, Andreas Dilger wrote:
> The printf("%.*s") format requires both the buffer size and buffer
> pointer to be specified for each use.  Since this is repeatedly given
> as "(int)sizeof(buf), (char *)buf" for mmp_nodename and mmp_bdevname
> fields, with typecasts to avoid compiler warnings.
> 
> Add a helper macro EXT2_LEN_STR() to avoid repeated boilerplate code.
> 
> This can also be used for other superblock buffer fields that may not
> have NUL-terminated strings (e.g. s_volume_name, s_last_mounted,
> s_{first,last}_error_func, s_mount_opts) to simplify code and avoid
> the need for temporary buffers for NUL-termination.
> 
> Annotate the superblock string fields that may not be NUL-terminated.
> 
> Signed-off-by: Andreas Dilger <adilger@...ger.ca>

Applied, thanks.

						- Ted