linux-ext4 - Re: tune2fs: check whether filesystem is in use for I_flag and Q

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Date:   Mon, 20 Mar 2023 13:05:14 +0800
From:   Zhiqiang Liu <liuzhiqiang26@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     "Theodore Y. Ts'o" <tytso@....edu>, <adilger@...mcloud.com>,
        <jack@...e.cz>, linfeilong <linfeilong@...wei.com>,
        wuguanghao <wuguanghao3@...wei.com>,
        zhanchengbin <zhanchengbin1@...wei.com>, <libaokun1@...wei.com>
Subject: Re: tune2fs: check whether filesystem is in use for I_flag and Q_flag
 test

please ignore the patch.
sorry for that.

On 2023/3/20 13:03, Zhiqiang Liu wrote:
> From: Zhiqiang Liu <liuzhiqiang26@...wei.com>
> 
> For changing inode size (-I) and setting quota fearture (-Q), tune2fs
> only check whether the filesystem is umounted. Considering mount
> namepspaces, the filesystem is umounted, however it already be left
> in other mount namespace.
> So we add one check whether the filesystem is not in use with using
> EXT2_MF_BUSY flag, which can indicate the device is already opened
> with O_EXCL, as suggested by Ted.
> 
> Reported-by: Baokun Li <libaokun1@...wei.com>
> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
> Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
> ---
>  misc/tune2fs.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> index 458f7cf6..d75f4d94 100644
> --- a/misc/tune2fs.c
> +++ b/misc/tune2fs.c
> @@ -3520,9 +3520,9 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
>  	}
> 
>  	if (Q_flag) {
> -		if (mount_flags & EXT2_MF_MOUNTED) {
> +		if (mount_flags & (EXT2_MF_BUSY | EXT2_MF_MOUNTED)) {
>  			fputs(_("The quota feature may only be changed when "
> -				"the filesystem is unmounted.\n"), stderr);
> +				"the filesystem is unmounted and not in use.\n"), stderr);
>  			rc = 1;
>  			goto closefs;
>  		}
> @@ -3673,10 +3673,10 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
>  	}
> 
>  	if (I_flag) {
> -		if (mount_flags & EXT2_MF_MOUNTED) {
> +		if (mount_flags & (EXT2_MF_BUSY | EXT2_MF_MOUNTED)) {
>  			fputs(_("The inode size may only be "
>  				"changed when the filesystem is "
> -				"unmounted.\n"), stderr);
> +				"unmounted and not in use.\n"), stderr);
>  			rc = 1;
>  			goto closefs;
>  		}
>