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

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Date:   Tue, 23 May 2017 10:41:16 +0200
From:   Richard Weinberger <richard@....at>
To:     Christoph Hellwig <hch@...radead.org>
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

Christoph,

Am 23.05.2017 um 10:39 schrieb Christoph Hellwig:
>> +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.

UBIFS has no inode generations, inodes simply can't wrap around.
We "handle" it like JFF2 does, we assumes that the NAND is long dead
before we reach the maximum inode number.

Thanks,
//richard