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NFS: Use wait_on_atomic_t() for unlock after readahead

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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>
This commit is contained in:
Benjamin Coddington 2016-01-06 10:40:18 -05:00 • committed by Trond Myklebust
parent 942e3d72a6
commit 210c7c1750
6 changed files with 23 additions and 70 deletions
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8
fs/nfs/write.c
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@ -1565,14 +1565,6 @@ static void nfs_writeback_result(struct rpc_task *task,
}
}
static int nfs_wait_atomic_killable(atomic_t *key)
{
if (fatal_signal_pending(current))
return -ERESTARTSYS;
freezable_schedule_unsafe();
return 0;
}
static int wait_on_commit(struct nfs_mds_commit_info *cinfo)
{
return wait_on_atomic_t(&cinfo->rpcs_out,