From 01eea1cbba9d8309851f63356fa2f20a790af98f Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 27 Sep 2018 17:12:33 -0400 Subject: [PATCH] NFS: Fix dentry revalidation on NFSv4 lookup commit be189f7e7f03de35887e5a85ddcf39b91b5d7fc1 upstream. We need to ensure that inode and dentry revalidation occurs correctly on reopen of a file that is already open. Currently, we can end up not revalidating either in the case of NFSv4.0, due to the 'cached open' path. Let's fix that by ensuring that we only do cached open for the special cases of open recovery and delegation return. Reported-by: Stan Hu Signed-off-by: Trond Myklebust Signed-off-by: Qian Lu Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs4proc.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 1de855e..904e08b 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1355,12 +1355,20 @@ static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, return false; } -static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) +static int can_open_cached(struct nfs4_state *state, fmode_t mode, + int open_mode, enum open_claim_type4 claim) { int ret = 0; if (open_mode & (O_EXCL|O_TRUNC)) goto out; + switch (claim) { + case NFS4_OPEN_CLAIM_NULL: + case NFS4_OPEN_CLAIM_FH: + goto out; + default: + break; + } switch (mode & (FMODE_READ|FMODE_WRITE)) { case FMODE_READ: ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 @@ -1753,7 +1761,7 @@ static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) for (;;) { spin_lock(&state->owner->so_lock); - if (can_open_cached(state, fmode, open_mode)) { + if (can_open_cached(state, fmode, open_mode, claim)) { update_open_stateflags(state, fmode); spin_unlock(&state->owner->so_lock); goto out_return_state; @@ -2282,7 +2290,8 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata) if (data->state != NULL) { struct nfs_delegation *delegation; - if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) + if (can_open_cached(data->state, data->o_arg.fmode, + data->o_arg.open_flags, claim)) goto out_no_action; rcu_read_lock(); delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); -- 2.7.4