Re: [PATCH v3 09/26] block: Remove bi_idx references

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Oct 02, 2012 at 03:24:34PM -0400, Vivek Goyal wrote:
> On Mon, Sep 24, 2012 at 03:34:49PM -0700, Kent Overstreet wrote:
> 
> [..]
> > diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
> > index 95e52879..24e5cef 100644
> > --- a/drivers/block/floppy.c
> > +++ b/drivers/block/floppy.c
> > @@ -3778,7 +3778,6 @@ static int __floppy_read_block_0(struct block_device *bdev)
> >  	bio_vec.bv_len = size;
> >  	bio_vec.bv_offset = 0;
> >  	bio.bi_vcnt = 1;
> > -	bio.bi_idx = 0;
> 
> So leaving bio.bi_idx uninitialized is safer than setting it to zero? Can
> you explain a bit more that why this change is required? 

It's not uninitialized, because it just called bio_init() - it was
entirely redundant before.

It's not strictly necessary, but immutable bio vecs require getting rid
of a lot of bi_idx usage, and everything that's left is either
unecessary or better/cleaner done some other way, so it's best to just
get rid of all of them - immutable bvecs changes the semantics of bi_idx
just enough that directly using it tends to be wrong.

--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel


[Index of Archives]     [DM Crypt]     [Fedora Desktop]     [ATA RAID]     [Fedora Marketing]     [Fedora Packaging]     [Fedora SELinux]     [Yosemite Discussion]     [KDE Users]     [Fedora Docs]

  Powered by Linux