Re: [PATCH 1/1] fat: improve sync performance by grouping writes revised

["Holden Karau" <holden@pigscanfly.ca>]

On 10/31/06, Jörn Engel <joern@wohnheim.fh-wedel.de> wrote:
> On Tue, 31 October 2006 10:03:08 -0500, Holden Karau wrote:
> > +static int fat_mirror_bhs_optw(struct super_block *sb, struct buffer_head **bhs,
> > +                            int nr_bhs , int wait)
> >  {
> >       struct msdos_sb_info *sbi = MSDOS_SB(sb);
> > -     struct buffer_head *c_bh;
> > +     struct buffer_head *c_bh[nr_bhs*(sbi->fats)];
>
> Variable-sized array on the kernel-stack?  That can easily explode in
> your hands.  Unless you are _very_ sure about the bounds, you should
> do an explicit kmalloc.  And if you were that sure, you could just as
> well have an array with fixed size.
>
sbi->fats has a range of 2 to 4, but I suppose that might concievably
change if someone decides they want a fat filesystem with a lot of
backup FATs and modifies some other parts of the driver to support
that. I'll change it to use kmalloc.
> > +     if (sb->s_flags & MS_SYNCHRONOUS )
> [...]
> > +             }
> [...]
> > +                              int nr_bhs )
>
> Trailing whitespace in those lines.
..... oops. I'll fix that.
>
> Jörn
>
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