Hi Gu, Thanks for your reviewing!
Regards Yu > -----Original Message----- > From: Gu Zheng [mailto:[email protected]] > Sent: Wednesday, November 06, 2013 1:16 PM > To: Chao Yu > Cc: '???'; [email protected]; [email protected]; > [email protected]; '谭姝' > Subject: Re: [f2fs-dev] [PATCH] f2fs: avoid to use a NULL point in > destroy_segment_manager > > On 11/06/2013 01:10 PM, Chao Yu wrote: > > > Hi Gu, > > > >> -----Original Message----- > >> From: Gu Zheng [mailto:[email protected]] > >> Sent: Wednesday, November 06, 2013 11:41 AM > >> To: Chao Yu > >> Cc: ???; [email protected]; [email protected]; > >> [email protected]; 谭姝 > >> Subject: Re: [f2fs-dev] [PATCH] f2fs: avoid to use a NULL point in > >> destroy_segment_manager > >> > >> On 11/06/2013 09:12 AM, Chao Yu wrote: > >> > >>> A NULL point should avoid to be used in destroy_segment_manager after > >>> allocating memory fail for f2fs_sm_info. > >> > >> Though without this patch it still can work well, because if it failed > >> to allocate f2fs_sm_info, the sit_info, free_info... all were NULL, and > >> the destory path(e.g. destroy_dirty_segmap) can deal with them well. > > > > I think it could not work well. Without this patch we may got a segment > > fault in DIRTY_I(sbi) at the following code if it failed to allocate > > f2fs_sm_info memory(sbi->sm_info). Right? > > Yes, you're right. SIT_I generates sit_info from f2fs_sm_info. > Sorry for my mistake.:( > > Regards, > Gu > > > > > static void destroy_dirty_segmap(struct f2fs_sb_info *sbi) > > { > > struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); > > > >> IMO, this patch is still a good catch. > >> > >> Regards, > >> Gu > >> > >>> > >>> Signed-off-by: Chao Yu <[email protected]> > >>> --- > >>> fs/f2fs/segment.c | 2 ++ > >>> 1 file changed, 2 insertions(+) > >>> > >>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > >>> index 3d4d5fc..ff363e6 > >>> --- a/fs/f2fs/segment.c > >>> +++ b/fs/f2fs/segment.c > >>> @@ -1744,6 +1744,8 @@ static void destroy_sit_info(struct f2fs_sb_info > >>> *sbi) > >>> void destroy_segment_manager(struct f2fs_sb_info *sbi) > >>> { > >>> struct f2fs_sm_info *sm_info = SM_I(sbi); > >>> + if (!sm_info) > >>> + return; > >>> destroy_dirty_segmap(sbi); > >>> destroy_curseg(sbi); > >>> destroy_free_segmap(sbi); > > > > > > > > > = -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
