NFSv4: use exponential retry on NFS4ERR_DELAY for async requests.
Currently asynchronous NFSv4 request will be retried with
exponential timeout (from 1/10 to 15 seconds), but async
requests will always use a 15second retry.
Some "async" requests are really synchronous though. The
async mechanism is used to allow the request to continue if
the requesting process is killed.
In those cases, an exponential retry is appropriate.
For example, if two different clients both open a file and
get a READ delegation, and one client then unlinks the file
(while still holding an open file descriptor), that unlink
will used the "silly-rename" handling which is async.
The first rename will result in NFS4ERR_DELAY while the
delegation is reclaimed from the other client. The rename
will not be retried for 15 seconds, causing an unlink to take
15 seconds rather than 100msec.
This patch only added exponential timeout for async unlink and
async rename. Other async calls, such as 'close' are sometimes
waited for so they might benefit from exponential timeout too.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 288be08..45bce9e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -77,7 +77,7 @@
static int _nfs4_proc_open(struct nfs4_opendata *data);
static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
-static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
+static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
@@ -314,20 +314,30 @@
kunmap_atomic(start);
}
+static long nfs4_update_delay(long *timeout)
+{
+ long ret;
+ if (!timeout)
+ return NFS4_POLL_RETRY_MAX;
+ if (*timeout <= 0)
+ *timeout = NFS4_POLL_RETRY_MIN;
+ if (*timeout > NFS4_POLL_RETRY_MAX)
+ *timeout = NFS4_POLL_RETRY_MAX;
+ ret = *timeout;
+ *timeout <<= 1;
+ return ret;
+}
+
static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
{
int res = 0;
might_sleep();
- if (*timeout <= 0)
- *timeout = NFS4_POLL_RETRY_MIN;
- if (*timeout > NFS4_POLL_RETRY_MAX)
- *timeout = NFS4_POLL_RETRY_MAX;
- freezable_schedule_timeout_killable_unsafe(*timeout);
+ freezable_schedule_timeout_killable_unsafe(
+ nfs4_update_delay(timeout));
if (fatal_signal_pending(current))
res = -ERESTARTSYS;
- *timeout <<= 1;
return res;
}
@@ -2583,7 +2593,7 @@
if (calldata->arg.fmode == 0)
break;
default:
- if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
+ if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
goto out_release;
}
@@ -3572,7 +3582,8 @@
if (!nfs4_sequence_done(task, &res->seq_res))
return 0;
- if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
+ if (nfs4_async_handle_error(task, res->server, NULL,
+ &data->timeout) == -EAGAIN)
return 0;
update_changeattr(dir, &res->cinfo);
return 1;
@@ -3605,7 +3616,7 @@
if (!nfs4_sequence_done(task, &res->seq_res))
return 0;
- if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
+ if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
return 0;
update_changeattr(old_dir, &res->old_cinfo);
@@ -4109,7 +4120,8 @@
trace_nfs4_read(hdr, task->tk_status);
if (nfs4_async_handle_error(task, server,
- hdr->args.context->state) == -EAGAIN) {
+ hdr->args.context->state,
+ NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return -EAGAIN;
}
@@ -4177,10 +4189,11 @@
struct nfs_pgio_header *hdr)
{
struct inode *inode = hdr->inode;
-
+
trace_nfs4_write(hdr, task->tk_status);
if (nfs4_async_handle_error(task, NFS_SERVER(inode),
- hdr->args.context->state) == -EAGAIN) {
+ hdr->args.context->state,
+ NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return -EAGAIN;
}
@@ -4260,7 +4273,8 @@
struct inode *inode = data->inode;
trace_nfs4_commit(data, task->tk_status);
- if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
+ if (nfs4_async_handle_error(task, NFS_SERVER(inode),
+ NULL, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return -EAGAIN;
}
@@ -4813,7 +4827,8 @@
static int
-nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
+nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
+ struct nfs4_state *state, long *timeout)
{
struct nfs_client *clp = server->nfs_client;
@@ -4863,6 +4878,8 @@
#endif /* CONFIG_NFS_V4_1 */
case -NFS4ERR_DELAY:
nfs_inc_server_stats(server, NFSIOS_DELAY);
+ rpc_delay(task, nfs4_update_delay(timeout));
+ goto restart_call;
case -NFS4ERR_GRACE:
rpc_delay(task, NFS4_POLL_RETRY_MAX);
case -NFS4ERR_RETRY_UNCACHED_REP:
@@ -5103,8 +5120,8 @@
pnfs_roc_set_barrier(data->inode, data->roc_barrier);
break;
default:
- if (nfs4_async_handle_error(task, data->res.server, NULL) ==
- -EAGAIN) {
+ if (nfs4_async_handle_error(task, data->res.server,
+ NULL, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
@@ -5368,7 +5385,8 @@
case -NFS4ERR_EXPIRED:
break;
default:
- if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
+ if (nfs4_async_handle_error(task, calldata->server,
+ NULL, NULL) == -EAGAIN)
rpc_restart_call_prepare(task);
}
nfs_release_seqid(calldata->arg.seqid);
@@ -5974,7 +5992,8 @@
break;
case -NFS4ERR_LEASE_MOVED:
case -NFS4ERR_DELAY:
- if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
+ if (nfs4_async_handle_error(task, server,
+ NULL, NULL) == -EAGAIN)
rpc_restart_call_prepare(task);
}
}
@@ -7591,7 +7610,7 @@
rpc_restart_call_prepare(task);
}
}
- if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
+ if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
rpc_restart_call_prepare(task);
out:
dprintk("<-- %s\n", __func__);
@@ -7751,7 +7770,7 @@
case 0:
break;
case -NFS4ERR_DELAY:
- if (nfs4_async_handle_error(task, server, NULL) != -EAGAIN)
+ if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
break;
rpc_restart_call_prepare(task);
return;
@@ -7882,7 +7901,7 @@
case 0:
break;
default:
- if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
+ if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
rpc_restart_call_prepare(task);
return;
}
@@ -8178,7 +8197,7 @@
switch (task->tk_status) {
case -NFS4ERR_DELAY:
- if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
+ if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
rpc_restart_call_prepare(task);
}
}