linux-ext4 - Re: [PATCH] ext4: Fix missing iput for root inode in case of all failed mount paths.

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Message-ID: <AANLkTim0XZe2=3AWw4Ydb8F7BQGCf+=FyjKoyadc+3yw@mail.gmail.com>
Date:	Sat, 29 Jan 2011 21:40:34 -0800
From:	Manish Katiyar <mkatiyar@...il.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	"Theodore Ts'o" <tytso@....edu>, ext4 <linux-ext4@...r.kernel.org>,
	mkatiyar@...il.com
Subject: Re: [PATCH] ext4: Fix missing iput for root inode in case of all
 failed mount paths.

On Sun, Jan 16, 2011 at 10:05 AM, Manish Katiyar <mkatiyar@...il.com> wrote:
> On Sun, Jan 16, 2011 at 8:20 AM, Andreas Dilger <adilger@...ger.ca> wrote:
>> Why not just put the iput() at failed_mount4() instead of spread around the code?
>
> Thanks Andreas, Here is the updated patch.
>
> Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
> ---
>  fs/ext4/super.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index cb10a06..8fa53e9 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -3522,17 +3522,16 @@ no_journal:
>        if (IS_ERR(root)) {
>                ext4_msg(sb, KERN_ERR, "get root inode failed");
>                ret = PTR_ERR(root);
> +               root = NULL;
>                goto failed_mount4;
>        }
>        if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
> -               iput(root);
>                ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
>                goto failed_mount4;
>        }
>        sb->s_root = d_alloc_root(root);
>        if (!sb->s_root) {
>                ext4_msg(sb, KERN_ERR, "get root dentry failed");
> -               iput(root);
>                ret = -ENOMEM;
>                goto failed_mount4;
>        }
> @@ -3648,6 +3647,8 @@ cantfind_ext4:
>        goto failed_mount;
>
>  failed_mount4:
> +       iput(root);
> +       sb->s_root = NULL;
>        ext4_msg(sb, KERN_ERR, "mount failed");
>        destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
>  failed_mount_wq:
> --
> 1.7.1
>
>
>
>>
>> Cheers, Andreas
>>
>> On 2011-01-16, at 0:30, Manish Katiyar <mkatiyar@...il.com> wrote:
>>
>>> Fix missing iput for root inode in case of all failed mount paths.
>>> Fixes bug#26752
>>>
>>> Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
>>>
>>> ---
>>> fs/ext4/super.c |    8 +++++++-
>>> 1 files changed, 7 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
>>> index cb10a06..9570fcc 100644
>>> --- a/fs/ext4/super.c
>>> +++ b/fs/ext4/super.c
>>> @@ -3587,6 +3587,7 @@ no_journal:
>>>        if (err) {
>>>                ext4_msg(sb, KERN_ERR, "failed to initialize system "
>>>                         "zone (%d)", err);
>>> +               iput(root);
>>>                goto failed_mount4;
>>>        }
>>>
>>> @@ -3595,12 +3596,15 @@ no_journal:
>>>        if (err) {
>>>                ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
>>>                         err);
>>> +               iput(root);
>>>                goto failed_mount4;
>>>        }
>>>
>>>        err = ext4_register_li_request(sb, first_not_zeroed);
>>> -       if (err)
>>> +       if (err) {
>>> +               iput(root);
>>>                goto failed_mount4;
>>> +       }
>>>
>>>        sbi->s_kobj.kset = ext4_kset;
>>>        init_completion(&sbi->s_kobj_unregister);
>>> @@ -3609,6 +3613,7 @@ no_journal:
>>>        if (err) {
>>>                ext4_mb_release(sb);
>>>                ext4_ext_release(sb);
>>> +               iput(root);
>>>                goto failed_mount4;
>>>        };
>>>
>>> @@ -3648,6 +3653,7 @@ cantfind_ext4:
>>>        goto failed_mount;
>>>
>>> failed_mount4:
>>> +       sb->s_root = NULL;
>>>        ext4_msg(sb, KERN_ERR, "mount failed");
>>>        destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
>>> failed_mount_wq:

Hi Ted,

Any feedback on this ?

-- 
Thanks -
Manish
--
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