Re: d_splice_alias() problem.

[Andrew Morton]

Nikita Danilov <Nikita@xxxxxxxxxxx> wrote:
>
> for some time I am observing that during stress tests over NFS
> 
>     shrink_slab->...->prune_dcache()->prune_one_dentry()->...->iput()
> 
>  is called on inode with ->i_nlink == 0 which results in truncate and
>  file deletion. This is wrong in general (file system is re-entered), and
>  deadlock prone on some file systems.

The filesystem is only reentered if the caller of __alloc_pages() passed in
__GFP_FS, in which case the bug is in the caller, not in shrink_slab().

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