linux-ext4 - Re: [PATCH -v2 2/3] mke2fs: print extra information about existing ext2/3/4 file systems

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Date:	Tue, 6 May 2014 15:42:37 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH -v2 2/3] mke2fs: print extra information about existing
 ext2/3/4 file systems

On Mon, 5 May 2014, Theodore Ts'o wrote:

> Date: Mon,  5 May 2014 21:02:12 -0400
> From: Theodore Ts'o <tytso@....edu>
> To: Ext4 Developers List <linux-ext4@...r.kernel.org>
> Cc: Theodore Ts'o <tytso@....edu>
> Subject: [PATCH -v2 2/3] mke2fs: print extra information about existing
>     ext2/3/4 file systems
> 
> The basic idea is to provide a bit more context in this situation:
> 
> % ./misc/mke2fs -t ext4 /dev/sdc3
> mke2fs 1.42.9 (4-Feb-2014)
> /dev/sdc3 contains a ext4 file system
> Proceed anyway? (y,n)
> 
> ... by adding this bit of context:
> 
> % ./misc/mke2fs -t ext4 /dev/sdc3
> mke2fs 1.42.9 (4-Feb-2014)
> /dev/sdc3 contains a ext4 file system
> 	last mounted on /SOX-backups on Mon May  5 08:59:53 2014
> Proceed anyway? (y,n)
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
>  misc/util.c | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/misc/util.c b/misc/util.c
> index 15b4ce5..d63e21b 100644
> --- a/misc/util.c
> +++ b/misc/util.c
> @@ -105,6 +105,41 @@ void proceed_question(int delay)
>  	signal(SIGALRM, SIG_IGN);
>  }
>  
> +static void print_ext2_info(const char *device)
> +
> +{
> +	struct ext2_super_block	*sb;
> +	ext2_filsys		fs;
> +	errcode_t		retval;
> +	time_t 			tm;
> +	char			buf[80];
> +
> +	retval = ext2fs_open2(device, 0, 0, 0, 0, unix_io_manager, &fs);

Sorry for not noticing this earlier, but we might want to pass
EXT2_FLAG_64BITS.

> +	if (retval)
> +		return;
> +	sb = fs->super;
> +
> +	if (sb->s_mtime) {
> +		tm = sb->s_mtime;
> +		if (sb->s_last_mounted[0]) {
> +			memset(buf, 0, sizeof(buf));
> +			strncpy(buf, sb->s_last_mounted,
> +				sizeof(sb->s_last_mounted));
> +			printf(_("\tlast mounted on %s on %s"), buf,
> +			       ctime(&tm));
> +		} else
> +			printf(_("\tlast mounted on %s"), ctime(&tm));
> +	} else if (sb->s_mkfs_time) {
> +		tm = sb->s_mkfs_time;
> +		printf(_("\tcreated on %s"), ctime(&tm));
> +	} else if (sb->s_mkfs_time) {

This does not seem right, you've already checked for s_mkfs_time and
if was not set if you got here. I guess, it should be something else
? s_wtime perhaps ? But, can this be set when the fs was not mounted
(like using ext2fs library ?)

> +		tm = sb->s_mtime;

If you got here, then again this is not set.

Thanks!
-Lukas

> +		printf(_("\tlast modified on %s"), ctime(&tm));
> +	}
> +	ext2fs_close(fs);
> +}
> +
> +
>  /*
>   * return 1 if the device looks plausible, creating the file if necessary
>   */
> @@ -168,6 +203,8 @@ int check_plausibility(const char *device, int flags, int *ret_is_dev)
>  		else
>  			printf(_("%s contains a %s file system\n"), device,
>  			       fs_type);
> +		if (strncmp(fs_type, "ext", 3) == 0)
> +			print_ext2_info(device);
>  		free(fs_type);
>  		free(fs_label);
>  		return 0;
> 
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