Client fails to delete things it just created

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A writeback regression in 2.6.34-rc4 (fixed in 2.6.34-rc6) prevented the NFS client from deleting files it had just created. This is kernel.org bug 15819

Cause

This was caused by 

commit acdc53b2146c7ee67feb1f02f7bc3020126514b8
Author: Trond Myklebust <Trond.Myklebust@netapp.com>
Date:   Fri Feb 19 17:03:26 2010 -0800

    NFS: Replace __nfs_write_mapping with sync_inode()

    Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>


Resolution

This problem was fixed by: 

commit 71d0a6112a363e703e383ae5b12c492485c39701
Author: Trond Myklebust <Trond.Myklebust@netapp.com>
Date:   Thu Apr 22 15:35:57 2010 -0400

    NFS: Fix an unstable write data integrity race
    
    Commit 2c61be0a9478258f77b66208a0c4b1f5f8161c3c (NFS: Ensure that the WRITE
    and COMMIT RPC calls are always uninterruptible) exposed a race on file
    close. In order to ensure correct close-to-open behaviour, we want to wait
    for all outstanding background commit operations to complete.
    
    This patch adds an inode flag that indicates if a commit operation is under
    way, and provides a mechanism to allow ->write_inode() to wait for its
    completion if this is a data integrity flush.
    
    Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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