On Fri, Oct 14, 2016 at 09:25:59PM +0800, Chao Yu wrote: > On 2016/10/14 1:14, Jaegeuk Kim wrote: > > On Thu, Oct 13, 2016 at 06:33:19PM +0800, Chao Yu wrote: > >> Hi Jaegeuk, > >> > >> On 2016/10/13 7:23, Jaegeuk Kim wrote: > >>> This patch fixes using a wrong pointer for sum_page in f2fs_gc. > >>> > >>> Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org> > >>> --- > >>> fs/f2fs/gc.c | 10 +++++----- > >>> 1 file changed, 5 insertions(+), 5 deletions(-) > >>> > >>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c > >>> index e48142f..9c18917 100644 > >>> --- a/fs/f2fs/gc.c > >>> +++ b/fs/f2fs/gc.c > >>> @@ -854,16 +854,16 @@ static int do_garbage_collect(struct f2fs_sb_info > >>> *sbi, > >>> > >>> for (segno = start_segno; segno < end_segno; segno++) { > >>> > >>> - if (get_valid_blocks(sbi, segno, 1) == 0 || > >>> - unlikely(f2fs_cp_error(sbi))) > >>> - goto next; > >>> - > >>> /* find segment summary of victim */ > >>> sum_page = find_get_page(META_MAPPING(sbi), > >>> GET_SUM_BLOCK(sbi, segno)); > >>> - f2fs_bug_on(sbi, !PageUptodate(sum_page)); > >>> f2fs_put_page(sum_page, 0); > >>> > >>> + if (get_valid_blocks(sbi, segno, 1) == 0 || > >>> + !PageUptodate(sum_page) || > >> > >> Why uptodate flag of summary page can be cleared? someone truncates it? > > > > Well, it looks like no problem to remove this, since it will hit > > f2fs_cp_error(). I just intended to handle the above f2fs_bug_on here. > > If summary page becomes non-uptodate, it seems there is a bug in vfs/mm/f2fs, > why not keep it there to detect bug?
I found that the above get_sum_page() loop can give a page which is not uptodate caused by EIO. Then, we would get the above bug_on, if we move f2fs_cp_error() case like this patch. Thoughts? Thanks, ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel