From be3df3dd4c70ee020587a943a31b98a0fb4b6424 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 31 Oct 2019 18:40:32 -0400 Subject: NFSv4: Don't allow a cached open with a revoked delegation If the delegation is marked as being revoked, we must not use it for cached opens. Fixes: 869f9dfa4d6d ("NFSv4: Fix races between nfs_remove_bad_delegation() and delegation return") Signed-off-by: Trond Myklebust Signed-off-by: Anna Schumaker --- fs/nfs/delegation.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'fs/nfs/delegation.c') diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c index 071b90a45933..ccdfb5f98f35 100644 --- a/fs/nfs/delegation.c +++ b/fs/nfs/delegation.c @@ -53,6 +53,16 @@ nfs4_is_valid_delegation(const struct nfs_delegation *delegation, return false; } +struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode) +{ + struct nfs_delegation *delegation; + + delegation = rcu_dereference(NFS_I(inode)->delegation); + if (nfs4_is_valid_delegation(delegation, 0)) + return delegation; + return NULL; +} + static int nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark) { -- cgit v1.2.3-59-g8ed1b