Re: [f2fs-dev] [PATCH] f2fs: device alias: add sanity check for device alias inode

[Chao Yu <chao@kernel.org>]

On 2024/9/25 4:38, Daeho Jeong wrote:
> On Mon, Sep 23, 2024 at 7:32 PM Chao Yu via Linux-f2fs-devel
> <linux-f2fs-devel@lists.sourceforge.net> wrote:
>>
>> Do sanity check for extent info of device alias inode, in order to
>> avoid unexpected error caused by fuzz test.
>>
>> Cc: Daeho Jeong <daehojeong@google.com>
>> Signed-off-by: Chao Yu <chao@kernel.org>
>> ---
>>
>> To Daeho and Jaegeuk,
>>
>> Merge this into initial patch or merge it separately is both fine
>> to me.
> 
> I am going to merge this into my one. Thanks~!
> 
>>
>>   fs/f2fs/extent_cache.c | 32 +++++++++++++++++++++++++++++++-
>>   1 file changed, 31 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
>> index 0c8a705faa8b..5bf9e4c2b49c 100644
>> --- a/fs/f2fs/extent_cache.c
>> +++ b/fs/f2fs/extent_cache.c
>> @@ -24,6 +24,7 @@ bool sanity_check_extent_cache(struct inode *inode, struct page *ipage)
>>          struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>>          struct f2fs_extent *i_ext = &F2FS_INODE(ipage)->i_ext;
>>          struct extent_info ei;
>> +       int devi;
>>
>>          get_read_extent_info(&ei, i_ext);
>>
>> @@ -38,7 +39,36 @@ bool sanity_check_extent_cache(struct inode *inode, struct page *ipage)
>>                            ei.blk, ei.fofs, ei.len);
>>                  return false;
>>          }
>> -       return true;
>> +
>> +       if (!IS_DEVICE_ALIASING(inode))
>> +               return true;
>> +
>> +       for (devi = 0; devi < sbi->s_ndevs; devi++) {
>> +               if (FDEV(devi).start_blk != ei.blk ||
>> +                       FDEV(devi).end_blk != ei.blk + ei.len)
> 
> ei.blk + ei.len -> ei.blk + ei.len - 1?

Yes, thanks for the correcting.

Thanks,

> 
>> +                       continue;
>> +
>> +               if (devi == 0) {
>> +                       f2fs_warn(sbi,
>> +                               "%s: inode (ino=%lx) is an alias of meta device",
>> +                               __func__, inode->i_ino);
>> +                       return false;
>> +               }
>> +
>> +               if (bdev_is_zoned(FDEV(devi).bdev)) {
>> +                       f2fs_warn(sbi,
>> +                               "%s: device alias inode (ino=%lx)'s extent info "
>> +                               "[%u, %u, %u] maps to zoned block device",
>> +                               __func__, inode->i_ino, ei.blk, ei.fofs, ei.len);
>> +                       return false;
>> +               }
>> +               return true;
>> +       }
>> +
>> +       f2fs_warn(sbi, "%s: device alias inode (ino=%lx)'s extent info "
>> +                       "[%u, %u, %u] is inconsistent w/ any devices",
>> +                       __func__, inode->i_ino, ei.blk, ei.fofs, ei.len);
>> +       return false;
>>   }
>>
>>   static void __set_extent_info(struct extent_info *ei,
>> --
>> 2.40.1
>>
>>
>>
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