Hi Olga
On Wed, 2019-09-11 at 16:13 -0400, Olga Kornievskaia wrote:
> Hi Trond,
>
> This patch is causing me "problem" (can be seen using generic/323).
> This test creates 100 processes that each want to open the same file,
> then close it. Each open gets a stateid with an increasing seqid (the
> last received by the client is stateid seqid=100). With the patch,
> upon close I see 1st CLOSE use stateid seqid=1 which ends up failing
> with ERR_OLD_STATEID and retried until stateid seqid=100 (which was
> the current id). Reverting the patch give back sending the CLOSE with
> seqid=100. While nothing failing, I don't think the client's behavior
> is correct.
Does the following work for you?
Cheers
Trond
8<---------------------------------------------
>From 859f6c0f468785770c6e87ae4f62294415018e89 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Date: Tue, 3 Sep 2019 17:37:19 -0400
Subject: [PATCH v2] NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE
If a CLOSE or OPEN_DOWNGRADE operation receives a NFS4ERR_OLD_STATEID
then bump the seqid before resending. Ensure we only bump the seqid
by 1.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/nfs4_fs.h | 2 --
fs/nfs/nfs4proc.c | 75 ++++++++++++++++++++++++++++++++++++++++++++--
fs/nfs/nfs4state.c | 16 ----------
3 files changed, 72 insertions(+), 21 deletions(-)
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index e8f74ed98e42..16b2e5cc3e94 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -491,8 +491,6 @@ extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
const struct nfs_lock_context *, nfs4_stateid *,
const struct cred **);
-extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
- struct nfs4_state *state);
extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
struct nfs4_state *state);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 025dd5efbf34..c14af2c1c6b6 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3308,6 +3308,75 @@ nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
return pnfs_wait_on_layoutreturn(inode, task);
}
+/*
+ * Update the seqid of an open stateid
+ */
+static void nfs4_sync_open_stateid(nfs4_stateid *dst,
+ struct nfs4_state *state)
+{
+ __be32 seqid_open;
+ u32 dst_seqid;
+ int seq;
+
+ for (;;) {
+ if (!nfs4_valid_open_stateid(state))
+ break;
+ seq = read_seqbegin(&state->seqlock);
+ if (!nfs4_state_match_open_stateid_other(state, dst)) {
+ nfs4_stateid_copy(dst, &state->open_stateid);
+ if (read_seqretry(&state->seqlock, seq))
+ continue;
+ break;
+ }
+ seqid_open = state->open_stateid.seqid;
+ if (read_seqretry(&state->seqlock, seq))
+ continue;
+
+ dst_seqid = be32_to_cpu(dst->seqid);
+ if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
+ dst->seqid = seqid_open;
+ break;
+ }
+}
+
+/*
+ * Update the seqid of an open stateid after receiving
+ * NFS4ERR_OLD_STATEID
+ */
+static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
+ struct nfs4_state *state)
+{
+ __be32 seqid_open;
+ u32 dst_seqid;
+ bool ret;
+ int seq;
+
+ for (;;) {
+ ret = false;
+ if (!nfs4_valid_open_stateid(state))
+ break;
+ seq = read_seqbegin(&state->seqlock);
+ if (!nfs4_state_match_open_stateid_other(state, dst)) {
+ if (read_seqretry(&state->seqlock, seq))
+ continue;
+ break;
+ }
+ seqid_open = state->open_stateid.seqid;
+ if (read_seqretry(&state->seqlock, seq))
+ continue;
+
+ dst_seqid = be32_to_cpu(dst->seqid);
+ if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0)
+ dst->seqid = cpu_to_be32(dst_seqid + 1);
+ else
+ dst->seqid = seqid_open;
+ ret = true;
+ break;
+ }
+
+ return ret;
+}
+
struct nfs4_closedata {
struct inode *inode;
struct nfs4_state *state;
@@ -3382,7 +3451,7 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
break;
case -NFS4ERR_OLD_STATEID:
/* Did we race with OPEN? */
- if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
+ if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
state))
goto out_restart;
goto out_release;
@@ -3451,8 +3520,8 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
} else if (is_rdwr)
calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
- if (!nfs4_valid_open_stateid(state) ||
- !nfs4_refresh_open_stateid(&calldata->arg.stateid, state))
+ nfs4_sync_open_stateid(&calldata->arg.stateid, state);
+ if (!nfs4_valid_open_stateid(state))
call_close = 0;
spin_unlock(&state->owner->so_lock);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index cad4e064b328..e23945174da4 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1015,22 +1015,6 @@ static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
return ret;
}
-bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
-{
- bool ret;
- int seq;
-
- do {
- ret = false;
- seq = read_seqbegin(&state->seqlock);
- if (nfs4_state_match_open_stateid_other(state, dst)) {
- dst->seqid = state->open_stateid.seqid;
- ret = true;
- }
- } while (read_seqretry(&state->seqlock, seq));
- return ret;
-}
-
bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
bool ret;
--
2.21.0
--
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@xxxxxxxxxxxxxxx
