Trond Myklebust 5a6d41b32a
NFS: Ensure PG_writeback is cleared when writeback fails ...
If the writebacks are cancelled via nfs_cancel_dirty_list, or due to the
memory allocation failing in nfs_flush_one/nfs_flush_multi, then we must
ensure that the PG_writeback flag is cleared.
Also ensure that we actually own the PG_writeback flag whenever we
schedule a new writeback by making nfs_set_page_writeback() return the
value of test_set_page_writeback().
The PG_writeback page flag ends up replacing the functionality of the
PG_FLUSHING nfs_page flag, so we rip that out too.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
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