linux-ext4 - Re: [PATCH v6 19/21] ext4: Send notifications on error

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Date:   Mon, 16 Aug 2021 18:26:15 +0200
From:   Jan Kara <jack@...e.cz>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     amir73il@...il.com, jack@...e.com, linux-api@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        khazhy@...gle.com, dhowells@...hat.com, david@...morbit.com,
        tytso@....edu, djwong@...nel.org, repnop@...gle.com,
        kernel@...labora.com
Subject: Re: [PATCH v6 19/21] ext4: Send notifications on error

On Thu 12-08-21 17:40:08, Gabriel Krisman Bertazi wrote:
> Send a FS_ERROR message via fsnotify to a userspace monitoring tool
> whenever a ext4 error condition is triggered.  This follows the existing
> error conditions in ext4, so it is hooked to the ext4_error* functions.
> 
> It also follows the current dmesg reporting in the format.  The
> filesystem message is composed mostly by the string that would be
> otherwise printed in dmesg.
> 
> A new ext4 specific record format is exposed in the uapi, such that a
> monitoring tool knows what to expect when listening errors of an ext4
> filesystem.
> 
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> Reviewed-by: Amir Goldstein <amir73il@...il.com>
> ---
>  fs/ext4/super.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

<snip>

> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index dfa09a277b56..b9ecd43678d7 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -897,6 +904,7 @@ void __ext4_std_error(struct super_block *sb, const char *function,
>  		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
>  		       sb->s_id, function, line, errstr);
>  	}
> +	fsnotify_sb_error(sb, sb->s_root->d_inode, errno);
>  
>  	ext4_handle_error(sb, false, -errno, 0, 0, function, line);
>  }

Does it make sense to report root inode here? ext4_std_error() gets
generally used for filesystem-wide errors.

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR