linux-ext4 - Re: [PATCH 5/6] ubifs: Implement export

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Message-ID: <20170523083932.GC4107@infradead.org>
Date:   Tue, 23 May 2017 01:39:32 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Richard Weinberger <richard@....at>
Cc:     linux-mtd@...ts.infradead.org, david@...ma-star.at,
        dedekind1@...il.com, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        adilger.kernel@...ger.ca, akpm@...ux-foundation.org,
        linux-ext4@...r.kernel.org, bfields@...hat.com,
        marcus.folkesson@...il.com, hyc.lee@...il.com,
        rockdotlee@...il.com, leon.pollak@...il.com
Subject: Re: [PATCH 5/6] ubifs: Implement export_operations

> +static struct inode *ubifs_nfs_get_inode(struct super_block *sb, uint64_t ino,
> +					 uint32_t generation)
> +{
> +	return ubifs_iget(sb, ino);
> +}

You need to maintain and check an inode generation counter for this
to be safe.