Re: [patch 1/1] PM: Adds remount fs ro at suspend

[akuster <akuster@mvista.com>]

Andrew Morton wrote:
> On Fri, 02 Feb 2007 13:50:10 -1000
> akuster@mvista.com wrote:
>
> >
<snipped>

> > +struct suspremount {
> > +struct super_block *sb;
> > +struct suspremount *next;
> > +};
>
> The fields of this struct need a leading tab.
ok.
> The name "suspremount" might be unpopular.  suspend_remount_state would be
> more kernely.
ok.

> > +static struct suspremount *suspremount_list;
> > +
> > +void suspend_remount_log_fs(struct super_block *sb)
> > +{
> > +	struct suspremount *remountp;
> > +
> > +	if ((remountp = (struct suspremount *)
> > +		kmalloc(sizeof(struct suspremount), GFP_KERNEL)) != NULL) {
>
> The typecast is unneeded, and the compounded assign-and-test is not
> preferred style.  So here, please use
>
> 	struct suspremount *remountp;
>
> 	remountp = kmalloc(sizeof(*remountp), GFP_KERNEL);
> 	if (remountp != NULL) {

ok.

> > +EXPORT_SYMBOL(suspend_remount_all_fs_ro);
>
> Why is this exported to modules?
it shouldn't. will remove


> > +		sb = remountp->sb;
> > +		flags = 0;
> > +		if (sb->s_op && sb->s_op->remount_fs) {
> > +			ret = sb->s_op->remount_fs(sb, &flags, NULL);
> > +			if (ret) printk("resume_remount_rw: error %d\n", ret);
>
> newline needed here.

ok.
> super_block_operations.remount_fs() is supposed to be called under lock_super().
> Some filesystems might go BUG over this, or something.   Was there a reason to
> not do this?

nope. will correct

> > +		}
> > +
> > +		tp = remountp->next;
> > +		kfree(remountp);
> > +		remountp = tp;
> > +	}
> > +	suspremount_list = NULL;
> > +}
> > +EXPORT_SYMBOL(resume_remount_fs_rw);
>
> Why the export?

shouldn't
> All this code is singly-threaded at a much higher level (I hope), hence
> that list doesn't need locking.  However a comment explaining this might be
> good.

ok.

> > @@ -613,6 +677,9 @@ int do_remount_sb(struct super_block *sb
> >  		unlock_super(sb);
> >  		if (retval)
> >  			return retval;
> > +#ifdef CONFIG_SUSPEND_REMOUNTFS
> > +		suspend_remount_log_fs(sb);
> > +#endif
>
> We try to avoid putting ifdefs in C files.  So in a header file, do
>
> struct super_block;
> #ifdef CONFIG_SUSPEND_REMOUNTFS
> extern void suspend_remount_log_fs(struct super_block *sb);
> #else
> static inline void suspend_remount_log_fs(struct super_block *sb) {}
> #endif
will do.

Many thanks on the feedback.

Armin
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