From 12f275cdd1638a163b77b3d65625fc14a81dab2b Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 6 Nov 2017 15:28:05 -0500 Subject: NFSv4: Retry CLOSE and DELEGRETURN on NFS4ERR_OLD_STATEID. If we're racing with an OPEN, then retry the operation instead of declaring it a success. Signed-off-by: Trond Myklebust [Andrew W Elble: Fix a typo in nfs4_refresh_open_stateid] Signed-off-by: Anna Schumaker --- fs/nfs/delegation.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'fs/nfs/delegation.c') diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c index 606dd3871f66..ade44ca0c66c 100644 --- a/fs/nfs/delegation.c +++ b/fs/nfs/delegation.c @@ -1040,6 +1040,33 @@ int nfs_delegations_present(struct nfs_client *clp) return ret; } +/** + * nfs4_refresh_delegation_stateid - Update delegation stateid seqid + * @dst: stateid to refresh + * @inode: inode to check + * + * Returns "true" and updates "dst->seqid" * if inode had a delegation + * that matches our delegation stateid. Otherwise "false" is returned. + */ +bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode) +{ + struct nfs_delegation *delegation; + bool ret = false; + if (!inode) + goto out; + + rcu_read_lock(); + delegation = rcu_dereference(NFS_I(inode)->delegation); + if (delegation != NULL && + nfs4_stateid_match_other(dst, &delegation->stateid)) { + dst->seqid = delegation->stateid.seqid; + return ret; + } + rcu_read_unlock(); +out: + return ret; +} + /** * nfs4_copy_delegation_stateid - Copy inode's state ID information * @inode: inode to check -- cgit v1.2.3