tree 88095acd2d455b594f4cec08702aa9691faff2a0
parent 1dd761e9070aa2e543df3db41bd75ed4b8f2fab9
author Trond Myklebust <Trond.Myklebust@netapp.com> 1142880290 -0500
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1142880290 -0500

NFS: Fix a race with PG_private and nfs_release_page()

We don't need to set PG_private for readahead pages, since they never get
unlocked while I/O is in progress. However there is a small race in
nfs_readpage_release() whereby the page may be unlocked, and have
PG_private set.

Fix is to have PG_private set only for the case of writes...

Also fix a bug in nfs_clear_page_writeback(): Don't attempt to clear the
radix_tree tag if we've already deleted the radix tree entry.

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