On Wed, 18 Jul 2012, Eric Sandeen wrote:
> Date: Wed, 18 Jul 2012 14:54:04 -0500
> From: Eric Sandeen <sandeen@xxxxxxxxxx>
> To: Lukas Czerner <lczerner@xxxxxxxxxx>
> Cc: linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, tytso@xxxxxxx,
> achender@xxxxxxxxxxxxxxxxxx, Hugh Dickins <hughd@xxxxxxxxxx>
> Subject: Re: [PATCH 03/12 v2] shmem: pass LLONG_MAX to shmem_truncate_range
>
> On 7/13/12 8:19 AM, Lukas Czerner wrote:
> > Currently we're passing -1 to shmem_truncate_range which can then call
> > truncate_inode_pages_range() which is actually really confusing since the
> > argument is signed so we do not get "huge" number as one would expect,
> > but rather just -1. To make things clearer and easier for
> > truncate_inode_pages_range() just pass LLONG_MAX since it is actually what
> > was intended anyway.
> >
> > It also makes thing easier for allowing truncate_inode_pages_range() to
> > handle non page aligned regions. Moreover letting the lend argument to
> > be negative might actually hide some bugs.
> >
> > Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
> > Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> > ---
> > mm/shmem.c | 3 ++-
> > 1 files changed, 2 insertions(+), 1 deletions(-)
> >
> > diff --git a/mm/shmem.c b/mm/shmem.c
> > index 4ce02e0..3199733 100644
> > --- a/mm/shmem.c
> > +++ b/mm/shmem.c
> > @@ -2961,7 +2961,8 @@ void shmem_unlock_mapping(struct address_space *mapping)
> >
> > void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
> > {
> > - truncate_inode_pages_range(inode->i_mapping, lstart, lend);
> > + truncate_inode_pages_range(inode->i_mapping, lstart,
> > + lend == -1 ? LLONG_MAX : last);
>
> Where'd "last" come from? That won't build; should be "lend" right?
>
> (code only goes this way if !CONFIG_SHMEM so you might have missed it)
Ah, I definitely missed it. Thanks Eric. But from the discussion
with the Hugh, we're going to do this a bit differently anyway.
-Lukas
>
> -Eric
>
> > }
> > EXPORT_SYMBOL_GPL(shmem_truncate_range);
> >
> >
>
>
>
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