2013/3/18, Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>:
> 2013-03-17 (일), 17:27 +0900, Namjae Jeon:
>> From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
>>
>> 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@xxxxxxxxxxx>
>> Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
>> ---
>> 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.
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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