linux-kernel - Re: [PATCH] ocfs2: use retval instead of status for checking error

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Message-ID: <CAHb8M2BFsAbSTyK63_p7HB2a=mXCVuNSsDe7u4gBowtMMiMsYA@mail.gmail.com>
Date:	Thu, 23 Apr 2015 10:20:20 +0900
From:	DaeSeok Youn <daeseok.youn@...il.com>
To:	Joseph Qi <joseph.qi@...wei.com>
Cc:	mfasheh@...e.com, Joel Becker <jlbec@...lplan.org>,
	"ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Richard Weinberger <richard@....at>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ocfs2: use retval instead of status for checking error

Hi, Joseph.

2015-04-23 9:49 GMT+09:00 Joseph Qi <joseph.qi@...wei.com>:
> On 2015/4/19 13:43, Daeseok Youn wrote:
>> The use of 'status' in __ocfs2_add_entry() can return wrong
>> value. Some functions' return value in __ocfs2_add_entry(),
>> i.e ocfs2_journal_access_di() is saved to 'status'.
>> But 'status' is not used in 'bail' label for returning result
>> of __ocfs2_add_entry().
>>
>> So use retval instead of status.
>>
>> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
>
> Reviewed-by: Joseph Qi <joseph.qi@...wei.com>
Thanks for review.

regards,
Daeseok Youn.
>> ---
>> This patch was came from 'https://lkml.org/lkml/2015/2/27/655'
>> This patch was needed to test but I didn't have any environment
>> for testing ocfs2 filesystem. But I have one, now.
>> (I'm too busy to make this enviroment. And qemu for this fs is difficult
>>  for me. :-(, sorry for that)
>>
>> Briefly how to set my environment for testing this fs with qemu.
>> 1. Getting and building linux kernel with linux-next branch for x86_64 qemu.
>>    And also options of ocfs2 related are enabled(built-in)
>> 2. Makes own root file system with 'buildroot' project.
>> 3. Getting and building ocfs2-tools.
>>   Then binaries after building this tool are moved my rootfs.
>> 4. Makes dummy disk image(5G) which will be formatted in qemu.
>> 5. Booting qemu with rootfs image and dummy disk image.
>> 6. mkfs.ocfs2 --fs-feature=local <device>
>>   this maybe possilbe to mount standalone mode.
>> 7. tunefs.ocfs2  --fs-features=indexed-dirs,noinline-data <device>
>> 8. make a cluster and one node
>>   use o2cb_ctl tool.
>> 9. o2cb service load and initialize
>>   # /etc/init.d/o2cb load && /etc/init.d/o2cb configure
>>   # /etc/init.d/o2cb online
>> 10. mount ocfs2
>>   # mount.ocfs2 <device> <some directory>
>>
>> And use GDB for debugging my patch path.
>> Connect gdb with qemu and add breakpoint in __ocfs2_add_entry() of fs/ocfs2/dir.c
>>
>> And test my patch.
>> # cd <some directory mounted with ocfs2>
>> # mkdir <specific directory>
>>
>> This how-to is not written all my work, just briefly I said.
>>
>>  fs/ocfs2/dir.c |   20 ++++++++++----------
>>  1 files changed, 10 insertions(+), 10 deletions(-)
>>
>> diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
>> index 990e8f7..a9513ff 100644
>> --- a/fs/ocfs2/dir.c
>> +++ b/fs/ocfs2/dir.c
>> @@ -1607,7 +1607,7 @@ int __ocfs2_add_entry(handle_t *handle,
>>       struct ocfs2_dir_entry *de, *de1;
>>       struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
>>       struct super_block *sb = dir->i_sb;
>> -     int retval, status;
>> +     int retval;
>>       unsigned int size = sb->s_blocksize;
>>       struct buffer_head *insert_bh = lookup->dl_leaf_bh;
>>       char *data_start = insert_bh->b_data;
>> @@ -1685,25 +1685,25 @@ int __ocfs2_add_entry(handle_t *handle,
>>                       }
>>
>>                       if (insert_bh == parent_fe_bh)
>> -                             status = ocfs2_journal_access_di(handle,
>> +                             retval = ocfs2_journal_access_di(handle,
>>                                                                INODE_CACHE(dir),
>>                                                                insert_bh,
>>                                                                OCFS2_JOURNAL_ACCESS_WRITE);
>>                       else {
>> -                             status = ocfs2_journal_access_db(handle,
>> +                             retval = ocfs2_journal_access_db(handle,
>>                                                                INODE_CACHE(dir),
>>                                                                insert_bh,
>>                                             OCFS2_JOURNAL_ACCESS_WRITE);
>>
>> -                             if (ocfs2_dir_indexed(dir)) {
>> -                                     status = ocfs2_dx_dir_insert(dir,
>> +                             if (!retval && ocfs2_dir_indexed(dir))
>> +                                     retval = ocfs2_dx_dir_insert(dir,
>>                                                               handle,
>>                                                               lookup);
>> -                                     if (status) {
>> -                                             mlog_errno(status);
>> -                                             goto bail;
>> -                                     }
>> -                             }
>> +                     }
>> +
>> +                     if (retval) {
>> +                             mlog_errno(retval);
>> +                             goto bail;
>>                       }
>>
>>                       /* By now the buffer is marked for journaling */
>>
>
>
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