linux-kernel - Re: [PATCH 1/5] fat: add i_disksize to represent uninitialized size

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Date:	Wed, 30 Oct 2013 13:34:29 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, a.sahrawat@...sung.com,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH 1/5] fat: add i_disksize to represent uninitialized size

2013/10/30, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>>>> diff --git a/fs/fat/cache.c b/fs/fat/cache.c
>>>> index 91ad9e1..37572c2 100644
>>>> --- a/fs/fat/cache.c
>>>> +++ b/fs/fat/cache.c
>>>> @@ -329,10 +329,10 @@ int fat_bmap(struct inode *inode, sector_t
>>>> sector,
>>>> sector_t *phys,
>>>>  			return 0;
>>>>
>>>>  		/*
>>>> -		 * ->mmu_private can access on only allocation path.
>>>> +		 * ->i_disksize can access on only allocation path.
>>>>  		 * (caller must hold ->i_mutex)
>>>>  		 */
>>>> -		last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1))
>>>> +		last_block = (MSDOS_I(inode)->i_disksize + (blocksize - 1))
>>>>  			>> blocksize_bits;
>>>>  		if (sector >= last_block)
>>>>  			return 0;
>>>
>>> Hm, bmap() ioctl returns between ->mmu_private and i_disksize? I'm not
>>> checking other FSes what does...
>> I added this code after checking such behaviour from ext4.
>
> OK. I will check with it. BTW, comment should say the both
> (i.e. ->mmu_private and ->i_disksize must under ->i_mutex).
Okay, I will update.
Thanks!
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
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