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SubjectRe: [PATCH] splice : Must fully check for fifos
On Thu, Nov 02 2006, Eric Dumazet wrote:
> With the patch this time :( Sorry guys
> Hi Andrew
> I think this patch is necessary. It's quite easy to crash a 2.6.19-rc4 box :(
> AFAIK the problem come from inode-diet (by Theodore Ts'o, (2006/Sep/27))
> Thank you
> [PATCH] splice : Must fully check for FIFO
> It appears that i_pipe, i_cdev and i_bdev share the same memory location
> (anonymous union in struct inode) since commits
> 577c4eb09d1034d0739e3135fd2cff50588024be
> eaf796e7ef6014f208c409b2b14fddcfaafe7e3a
> Because of that, testing i_pipe being NULL is not anymore sufficient
> to tell if an inode is a FIFO or not.
> Therefore, we must use the S_ISFIFO(inode->i_mode) test before
> assuming i_pipe pointer is pointing to a struct pipe_inode_info.

Indeed, the inode slimming introduced this bug. I'll queue up a test run
of things and send it upstream, thanks for catching this.

Jens Axboe

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