diff options
| author |   Trond Myklebust <trond.myklebust@primarydata.com> | 2016-09-22 13:39:14 -0400 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-09-27 14:35:04 -0400 |
| commit | 7f04883146b7cb1db57c3479820cbed511cafd05 (patch) | |
| tree | e3e2b04d8f915df299f8afd3cd7c581712e52c21 /fs/nfs/delegation.c | |
| parent | NFSv4: Fix a race when updating an open_stateid (diff) | |
| download | linux-dev-7f04883146b7cb1db57c3479820cbed511cafd05.tar.xz linux-dev-7f04883146b7cb1db57c3479820cbed511cafd05.zip | |
NFS: Always call nfs_inode_find_state_and_recover() when revoking a delegation
Don't rely on nfs_inode_detach_delegation() succeeding. That can race...
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/delegation.c')
| -rw-r--r-- | fs/nfs/delegation.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c index 094e0efe6a82..dff600ae0d74 100644 --- a/fs/nfs/delegation.c +++ b/fs/nfs/delegation.c @@ -662,18 +662,24 @@ static bool nfs_revoke_delegation(struct inode *inode, const nfs4_stateid *stateid) { struct nfs_delegation *delegation; + nfs4_stateid tmp; bool ret = false; rcu_read_lock(); delegation = rcu_dereference(NFS_I(inode)->delegation); if (delegation == NULL) goto out; - if (stateid && !nfs4_stateid_match(stateid, &delegation->stateid)) + if (stateid == NULL) { + nfs4_stateid_copy(&tmp, &delegation->stateid); + stateid = &tmp; + } else if (!nfs4_stateid_match(stateid, &delegation->stateid)) goto out; nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation); ret = true; out: rcu_read_unlock(); + if (ret) + nfs_inode_find_state_and_recover(inode, stateid); return ret; } @@ -685,10 +691,8 @@ void nfs_remove_bad_delegation(struct inode *inode, if (!nfs_revoke_delegation(inode, stateid)) return; delegation = nfs_inode_detach_delegation(inode); - if (delegation) { - nfs_inode_find_state_and_recover(inode, &delegation->stateid); + if (delegation) nfs_free_delegation(delegation); - } } EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation); |