On Sat, Sep 23, 2017 at 08:46:55AM +0800, Qu Wenruo wrote: > > > On 2017年09月23日 07:36, Liu Bo wrote: > > This uses a bool 'do_backup' to help understand this piece of code. > > > > Signed-off-by: Liu Bo <bo.li....@oracle.com> > > --- > > This is based on a patch "Btrfs: do not backup tree roots when fsync". > > > > fs/btrfs/disk-io.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c > > index cdb7043..9811b9d 100644 > > --- a/fs/btrfs/disk-io.c > > +++ b/fs/btrfs/disk-io.c > > @@ -3691,6 +3691,7 @@ int write_all_supers(struct btrfs_fs_info *fs_info, > > int max_mirrors) > > int max_errors; > > int total_errors = 0; > > u64 flags; > > + bool do_backup = (max_mirrors == 0); > > Why not replacing @max_mirrors with @do_backup as parameter?
If I read the code correctly, max_mirrors is not just for deciding backup. thanks, -liubo > > Thanks, > Qu > > do_barriers = !btrfs_test_opt(fs_info, NOBARRIER); > > @@ -3699,7 +3700,7 @@ int write_all_supers(struct btrfs_fs_info *fs_info, > > int max_mirrors) > > * not from fsync where the tree roots in fs_info have not > > * been consistent on disk. > > */ > > - if (max_mirrors == 0) > > + if (do_backup) > > backup_super_roots(fs_info); > > sb = fs_info->super_for_commit; > > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
