linux-kernel - Re: [PATCH 5/5] f2fs: avoid BUG_ON from check_nid_range and update return path in do_read

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Date:	Mon, 18 Mar 2013 14:40:19 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH 5/5] f2fs: avoid BUG_ON from check_nid_range and update
 return path in do_read_inode

2013-03-18 (월), 14:23 +0900, Namjae Jeon:
> 2013/3/18, Jaegeuk Kim <jaegeuk.kim@...sung.com>:
> > 2013-03-17 (일), 17:27 +0900, Namjae Jeon:
> >> From: Namjae Jeon <namjae.jeon@...sung.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.jeon@...sung.com>
> >> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.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;
> >
> Hi Jaegeuk.
> > 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?
> Instead of BUG_ON, we can make use of WARN_ON as that can also solve
> our purpose of finding the real bugs with the same information (back
> trace) and will also keep system running.
> 

Got it~!
Thanks,

> Thanks :)
> >
> >>  }
> >>
> >>  #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
> >
> --
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-- 
Jaegeuk Kim
Samsung

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