Re: ReiserFS Maximum file size (in practice)

[Hans Reiser <reiser@namesys.com>]

Jeff Mahoney wrote:

>
> Hey all -
>
> The ReiserFS FAQ that we quote and point people to when they ask 
> questions about limits in ReiserFS states that the maxmimum file size 
> for a reiserfs v3 filesystem is 2^60-1. However, the actual limits, in 
> practice, are far less.
>
> I tried to create a 3 TB sparse file, and ended up getting told it was 
> too large. 2 TB was too large also, just under 2 TB was ok.
>
> This is a result of super->s_maxbytes = (512LL << 32) - 
> s->s_blocksize;, in fs/reiserfs/super.c, which is set so that i_blocks 
> isn't overflowed.

if vs approves it, I do.

>
> Other filesystems that have the ability to cross the 2 TB limit on 
> file sizes simply ignore the limit and allow i_blocks to wrap. There's 
> really no reason we can't do the same.
>
> The patch is attached.
>
> -Jeff
>
>------------------------------------------------------------------------
>
>--- linux-2.6.5/fs/reiserfs/super.c	2004-05-14 15:32:49.000000000 -0400
>+++ linux-2.6.5.fix/fs/reiserfs/super.c	2004-05-18 12:07:25.000000000 -0400
>@@ -1204,7 +1204,7 @@
>     /* new format is limited by the 32 bit wide i_blocks field, want to
>     ** be one full block below that.
>     */
>-    s->s_maxbytes = (512LL << 32) - s->s_blocksize ;
>+    s->s_maxbytes = MAX_LFS_FILESIZE;
>     return 0;
> }
> 
>  
>