linux-ext4 - Re: [patch 069/283] ext3: handle corrupted orphan list at mount

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Date:	Fri, 25 Jul 2008 14:43:01 -0400
From:	"Mike Snitzer" <snitzer@...il.com>
To:	duaneg@...da.com
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-ext4@...r.kernel.org
Subject: Re: [patch 069/283] ext3: handle corrupted orphan list at mount

On Fri, Jul 25, 2008 at 2:41 PM, Mike Snitzer <snitzer@...il.com> wrote:
> On Fri, Jul 25, 2008 at 2:33 PM, Mike Snitzer <snitzer@...il.com> wrote:
>> On Fri, Jul 25, 2008 at 3:02 AM,  <akpm@...ux-foundation.org> wrote:
>>> From: "Duane Griffin" <duaneg@...da.com>
>>>
>>> If the orphan node list includes valid, untruncatable nodes with nlink > 0
>>> the ext3_orphan_cleanup loop which attempts to delete them will not do so,
>>> causing it to loop forever. Fix by checking for such nodes in the
>>> ext3_orphan_get function.
>>>
>>> This patch fixes the second case (image hdb.20000009.softlockup.gz)
>>> reported in http://bugzilla.kernel.org/show_bug.cgi?id=10882.
>>>
>>> [akpm@...ux-foundation.org: coding-style fixes]
>>> [akpm@...ux-foundation.org: printk warning fix]
>>> Signed-off-by: Duane Griffin <duaneg@...da.com>
>>> Cc: <linux-ext4@...r.kernel.org>
>>> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>>
>>> diff -puN fs/ext3/inode.c~ext3-handle-corrupted-orphan-list-at-mount fs/ext3/inode.c
>>> --- a/fs/ext3/inode.c~ext3-handle-corrupted-orphan-list-at-mount
>>> +++ a/fs/ext3/inode.c
>>> @@ -2253,6 +2253,19 @@ static void ext3_free_branches(handle_t
>>>        }
>>>  }
>>>
>>> +int ext3_can_truncate(struct inode *inode)
>>> +{
>>> +       if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
>>> +               return 0;
>>> +       if (S_ISREG(inode->i_mode))
>>> +               return 1;
>>> +       if (S_ISDIR(inode->i_mode))
>>> +               return 1;
>>> +       if (S_ISLNK(inode->i_mode))
>>> +               return !ext3_inode_is_fast_symlink(inode);
>>> +       return 0;
>>> +}
>>> +
>>>  /*
>>>  * ext3_truncate()
>>>  *
>>> @@ -2297,12 +2310,7 @@ void ext3_truncate(struct inode *inode)
>>>        unsigned blocksize = inode->i_sb->s_blocksize;
>>>        struct page *page;
>>>
>>> -       if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
>>> -           S_ISLNK(inode->i_mode)))
>>> -               return;
>>> -       if (ext3_inode_is_fast_symlink(inode))
>>> -               return;
>>> -       if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
>>> +       if (!ext3_can_truncate(inode))
>>>                return;
>>
>> I may be missing something here but doesn't the above change the logic
>> that was used in ext3_truncate for the S_ISDIR and S_ISLNK cases?
>>
>> Before ext3_truncate would be short-circuited if S_ISDIR or S_ISLNK,
>> now it won't... is that intended?
>
> Gah, I mistakenly read it as only being !S_ISDIR

heh.. I read it as only being !S_ISREG .. again sorry.
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