Re: [v2 PATCH] CIFS: Fix incorrect max RFC1002 write size value

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On Fri,  7 Oct 2011 23:27:31 +0400
Pavel Shilovsky <piastry@xxxxxxxxxxx> wrote:

> ..the length field has only 17 bits.
> 
> Signed-off-by: Pavel Shilovsky <piastry@xxxxxxxxxxx>
> ---
>  fs/cifs/connect.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 633c246..1a645ee 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -2807,10 +2807,10 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
>  
>  /*
>   * When the server doesn't allow large posix writes, only allow a wsize of
> - * 128k minus the size of the WRITE_AND_X header. That allows for a write up
> + * 2^17-1 minus the size of the WRITE_AND_X header. That allows for a write up
>   * to the maximum size described by RFC1002.
>   */
> -#define CIFS_MAX_RFC1002_WSIZE (128 * 1024 - sizeof(WRITE_REQ) + 4)
> +#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
>  
>  /*
>   * The default wsize is 1M. find_get_pages seems to return a maximum of 256

Looks fine...

If we're going to do this though, should we also consider getting rid
of the bogus pad in the WRITE_REQ header? It's preferable to make the
wsize as large as we can get away with...

Acked-by: Jeff Layton <jlayton@xxxxxxxxx>
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