tree d3e6e91f525fad7ab5fb23f38075af32184cc87c
parent 942e3d72a62dcfe5bf1569b179174718bbbcfbc3
author Benjamin Coddington <bcodding@redhat.com> 1452094818 -0500
committer Trond Myklebust <trond.myklebust@primarydata.com> 1452210171 -0500

NFS: Use wait_on_atomic_t() for unlock after readahead

The use of wait_on_atomic_t() for waiting on I/O to complete before
unlocking allows us to git rid of the NFS_IO_INPROGRESS flag, and thus the
nfs_iocounter's flags member, and finally the nfs_iocounter altogether.
The count of I/O is moved to the lock context, and the counter
increment/decrement functions become simple enough to open-code.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
[Trond: Fix up conflict with existing function nfs_wait_atomic_killable()]
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>