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NFSv4: Don't remove the delegation from the super_list more than once

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Add a check to ensure that we haven't already removed the delegation
from the inode after we take all the relevant locks.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-10-21 14:12:13 -04:00
parent b47e0e478c
commit f9e0cc9c97
1 changed files with 4 additions and 0 deletions
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4
fs/nfs/delegation.c
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@ -298,6 +298,10 @@ nfs_detach_delegation_locked(struct nfs_inode *nfsi,
return NULL;
spin_lock(&delegation->lock);
if (!delegation->inode) {
spin_unlock(&delegation->lock);
return NULL;
}
set_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
list_del_rcu(&delegation->super_list);
delegation->inode = NULL;