On Tue, Mar 23, 2010 at 11:25:18PM +0800, Wengang Wang wrote:
> On 10-03-23 11:03, Josef Bacik wrote:
> > On Tue, Mar 23, 2010 at 10:54:08PM +0800, Wengang Wang wrote:
> > > Hi,
> > >
> > > If the only thing is returning 0 in the freeze/unfreeze member functions, why
> > > not just remove the two functions?
> > >
> >
> > Because if the fs doesn't provide a freeze/unfreeze function, trying to do a
> > freeze will return -EOPNOTSUPP, which is not what we want. Thanks,
>
> How does freeze_fs()/unfreeze_fs() get called in btrfs? I think they
> called by freeze_bdev()/unfreeze_fs() respectively. And I don't see
> -EOPNOTSUPP is returned in the later two functions.
>
its in ioctl_fsfreeze,
/* If filesystem doesn't support freeze feature, return. */
if (sb->s_op->freeze_fs == NULL)
return -EOPNOTSUPP;
Thanks,
Josef
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