linux-ext4 - Re: [PATCH] mke2fs: Don't erase flash device if "-n" is given

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Date:	Tue, 07 Jun 2011 11:58:40 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andreas Dilger <adilger@...mcloud.com>
CC:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] mke2fs: Don't erase flash device if "-n" is given

On 6/7/11 11:22 AM, Andreas Dilger wrote:
> If "mke2fs -n" is used, there should be no changes to the underlying
> device.  Unfortunately, when the "discard" option was added in commit
> c7cd908be59f48c66b4f3ac9a631ffe3dde4f1ab, it did not check for the "-n"
> flag, and will discard all data on a flash device even if "-n" is given.

Oh, crud.

> Check for the "noaction" flag before discarding any filesystem data.
> 
> Signed-off-by: Andreas Dilger <adilger@...mcloud.com>

Reviewed-by: Eric Sandeen <sandeen@...hat.com>

> ---
>  misc/mke2fs.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index ddfa929..9472016 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -2132,7 +2132,7 @@ int main (int argc, char *argv[])
>  	}
>  
>  	/* Can't undo discard ... */
> -	if (discard && (io_ptr != undo_io_manager)) {
> +	if (!noaction && discard && (io_ptr != undo_io_manager)) {
>  		retval = mke2fs_discard_device(fs);
>  		if (!retval && io_channel_discard_zeroes_data(fs->io)) {
>  			if (verbose)

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