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NFS: Fix an rcu deadlock in nfs_delegation_find_inode()

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I was able to reproduce this pretty regularily using xfstests
generic/013 on NFS v4.0.

Reported-by: Ross Zwisler <Ross.Zwisler@linux.intel.com>
Fixes: 6c34265502 (NFSv4: Return NFS4ERR_DELAY when a delegation recall fails due to igrab())
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Anna Schumaker 2018-06-14 09:39:17 -04:00 committed by Trond Myklebust
parent 93b7f7ad20
commit d5681f59ee
1 changed files with 3 additions and 1 deletions
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4
fs/nfs/delegation.c
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@ -883,8 +883,10 @@ struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
rcu_read_lock(); rcu_read_lock();
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
res = nfs_delegation_find_inode_server(server, fhandle); res = nfs_delegation_find_inode_server(server, fhandle);
if (res != ERR_PTR(-ENOENT)) if (res != ERR_PTR(-ENOENT)) {
rcu_read_unlock();
return res; return res;
}
} }
rcu_read_unlock(); rcu_read_unlock();
return ERR_PTR(-ENOENT); return ERR_PTR(-ENOENT);