linux-kernel - Re: [PATCH 5/5] efivarfs: efivarfs_fill_super() ensure we clean up correctly on error

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Message-ID: <507D25F5.3030001@canonical.com>
Date:	Tue, 16 Oct 2012 17:16:37 +0800
From:	Jeremy Kerr <jeremy.kerr@...onical.com>
To:	Andy Whitcroft <apw@...onical.com>
CC:	Matthew Garrett <mjg@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] efivarfs: efivarfs_fill_super() ensure we clean up
 correctly on error

Hi Andy,

>> If we break out of the loop on the second (and onwards) iteration,
>> won't we still have the other inodes and dentries remaining
>> allocated?
>
> As we calling this from the mount_single() wrapper:
>
>          return mount_single(fs_type, flags, data, efivarfs_fill_super);
>
>
> which does this:
>
>      struct dentry *mount_single(struct file_system_type *fs_type,
> 	    int flags, void *data,
> 	    int (*fill_super)(struct super_block *, void *, int))
>      {
>      [...]
> 		    error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
> 		    if (error) {
> 			    deactivate_locked_super(s);
> 			    return ERR_PTR(error);
> 		    }
>      [...]
>
> I am expecting us to get called back via deactivate_locked_super(),
> which calls sb->kill_sb() which is:
>
>      static void efivarfs_kill_sb(struct super_block *sb)
>      {
> 	    kill_litter_super(sb);
> 	    efivarfs_sb = NULL;
>      }
>
> Which I believe will clean them up.

Awesome, thanks for that. Looks good to me.

Acked-by: Jeremy Kerr <jeremy.kerr@...onical.com>

Cheers,


Jeremy Kerr

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