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SUNRPC: Set memalloc_nofs_save() for sync tasks

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[ Upstream commit f0940f4b3284a00f38a5d42e6067c2aaa20e1f2e ]

We could recurse into NFS doing memory reclaim while sending a sync task,
which might result in a deadlock.  Set memalloc_nofs_save for sync task
execution.

Fixes: a1231fda7e ("SUNRPC: Set memalloc_nofs_save() on all rpciod/xprtiod jobs")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Benjamin Coddington 2021-03-03 08:47:16 -05:00 committed by Greg Kroah-Hartman
parent 475a4307c1
commit faa48b23d0
1 changed files with 4 additions and 1 deletions
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5
net/sunrpc/sched.c
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@ -963,8 +963,11 @@ void rpc_execute(struct rpc_task *task)
rpc_set_active(task);
rpc_make_runnable(rpciod_workqueue, task);
if (!is_async)
if (!is_async) {
unsigned int pflags = memalloc_nofs_save();
__rpc_execute(task);
memalloc_nofs_restore(pflags);
}
}
static void rpc_async_schedule(struct work_struct *work)