linux-kernel - Re: [PATCH v2 4/5] fat: eliminate orphaned inode number allocation

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Message-ID: <CAKYAXd8my3y9WXVwC0coYO=qTrSnGMoc+k14yx9t77tzJdax_g@mail.gmail.com>
Date:	Thu, 6 Sep 2012 15:30:52 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	akpm@...ux-foundation.org, bfields@...ldses.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v2 4/5] fat: eliminate orphaned inode number allocation

2012/9/5 OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>> 2012/9/5, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
>>> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:
>>>
>>>> Namjae Jeon <linkinjeon@...il.com> writes:
>>>>
>>>>> From: Namjae Jeon <namjae.jeon@...sung.com>
>>>>>
>>>>> Maintain a list of inode(i_pos) numbers of orphaned inodes (i.e the
>>>>> inodes that have been unlinked but still having open file
>>>>> descriptors).At file/directory creation time, skip using such i_pos
>>>>> values.Removal of the i_pos from the list is done during inode eviction.
>>>>
>>>> What happens if the directory (has busy entries) was completely removed?
>> Hi OGAWA.
>> There are 2 cases:
>> 1. The cluster can be used as a data cluster of a file - In which case
>> we can write
>> normally into it.
>> 2. The cluster can be allocated to a new directory. In this case, the busy i_pos
>> locations can not be used to create new entries until the correspnding
>> inodes are
>> evicted.
>
> In the (2) case, it has problem. Directory must not have de->name[0] == 0
> in middle of entires.  "0" means the end of directory.
Good point! I will fix it on next version of patches.
Thanks.
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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