[PATCH] splice : Must fully check for fifos

[Eric Dumazet <dada1@cosmosbay.com>]

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.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>

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