linux-ext4 - Re: [PATCH 03/12 v2] shmem: pass LLONG_MAX to shmem_truncate

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Date:	Wed, 18 Jul 2012 14:54:04 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
CC:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tytso@....edu, achender@...ux.vnet.ibm.com,
	Hugh Dickins <hughd@...gle.com>
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@...hat.com>
> Cc: Hugh Dickins <hughd@...gle.com>
> ---
>  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)

-Eric

>  }
>  EXPORT_SYMBOL_GPL(shmem_truncate_range);
>  
> 


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