From: Trond Myklebust trond.myklebust@hammerspace.com
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 stanhu@gmail.com Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Qian Lu luqia@amazon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/nfs/nfs4proc.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
--- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1317,12 +1317,20 @@ static bool nfs4_mode_match_open_stateid 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 @@ -1617,7 +1625,7 @@ static struct nfs4_state *nfs4_try_open_
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; @@ -2141,7 +2149,8 @@ static void nfs4_open_prepare(struct rpc 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);