[Ocfs2-devel] [PATCH] ocfs2: use retval instead of status for checking error

[DaeSeok Youn]

Hi, Joseph.

Can you review this patch again, actually you had reviewed by
 'https://lkml.org/lkml/2015/2/27/655'.

Thanks.

regards,
Daeseok Youn

2015-04-19 14:43 GMT+09:00 Daeseok Youn <daeseok.youn at gmail.com>:

> 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 at gmail.com>
> ---
> 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 */
> --
> 1.7.1
>
>
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