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

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Date:	Fri, 25 Jul 2008 14:33:35 -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 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?
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