Re: [PATCH 5/5] f2fs: avoid BUG_ON from check_nid_range and update return path in do_read_inode

[Jaegeuk Kim]

2013-03-17 (일), 17:27 +0900, Namjae Jeon:
> From: Namjae Jeon <namjae.j...@samsung.com>
> 
> In function check_nid_range, there is no need to trigger BUG_ON and make 
> kernel stop.
> Instead it could just check and indicate the inode number to be EINVAL.
> Update the return path in do_read_inode to use the return from 
> check_nid_range.
> 
> Signed-off-by: Namjae Jeon <namjae.j...@samsung.com>
> Signed-off-by: Amit Sahrawat <a.sahra...@samsung.com>
> ---
>  fs/f2fs/f2fs.h  |    6 ++++--
>  fs/f2fs/inode.c |    6 +++++-
>  2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index be7ae70..1dae921 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -515,9 +515,11 @@ static inline void mutex_unlock_op(struct f2fs_sb_info 
> *sbi, enum lock_type t)
>  /*
>   * Check whether the given nid is within node id range.
>   */
> -static inline void check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
> +static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
>  {
> -     BUG_ON((nid >= NM_I(sbi)->max_nid));
> +     if (nid >= NM_I(sbi)->max_nid)
> +             return -EINVAL;
> +     return 0;

At this moment, I'd like to apply this patch and remain BUG_ON together
since we should find real bugs in f2fs.
How do you think?

>  }
>  
>  #define F2FS_DEFAULT_ALLOCATED_BLOCKS        1
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index ddae412..6d82020 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -44,7 +44,11 @@ static int do_read_inode(struct inode *inode)
>       struct f2fs_inode *ri;
>  
>       /* Check if ino is within scope */
> -     check_nid_range(sbi, inode->i_ino);
> +     if (check_nid_range(sbi, inode->i_ino)) {
> +             f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
> +                      (unsigned long) inode->i_ino);
> +             return -EINVAL;
> +     }
>  
>       node_page = get_node_page(sbi, inode->i_ino);
>       if (IS_ERR(node_page))

-- 
Jaegeuk Kim
Samsung

signature.asc
Description: This is a digitally signed message part