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Diffstat (limited to 'fs/nfsd/nfs4callback.c')
-rw-r--r--fs/nfsd/nfs4callback.c191
1 files changed, 160 insertions, 31 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 32d23ef3e5de..87c9547989f6 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -45,7 +45,7 @@
#define NFSDDBG_FACILITY NFSDDBG_PROC
-static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
+static void nfsd4_mark_cb_fault(struct nfs4_client *clp);
#define NFSPROC4_CB_NULL 0
#define NFSPROC4_CB_COMPOUND 1
@@ -85,7 +85,21 @@ static void encode_uint32(struct xdr_stream *xdr, u32 n)
static void encode_bitmap4(struct xdr_stream *xdr, const __u32 *bitmap,
size_t len)
{
- WARN_ON_ONCE(xdr_stream_encode_uint32_array(xdr, bitmap, len) < 0);
+ xdr_stream_encode_uint32_array(xdr, bitmap, len);
+}
+
+static int decode_cb_fattr4(struct xdr_stream *xdr, uint32_t *bitmap,
+ struct nfs4_cb_fattr *fattr)
+{
+ fattr->ncf_cb_change = 0;
+ fattr->ncf_cb_fsize = 0;
+ if (bitmap[0] & FATTR4_WORD0_CHANGE)
+ if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0)
+ return -NFSERR_BAD_XDR;
+ if (bitmap[0] & FATTR4_WORD0_SIZE)
+ if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0)
+ return -NFSERR_BAD_XDR;
+ return 0;
}
static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
@@ -334,6 +348,30 @@ encode_cb_recallany4args(struct xdr_stream *xdr,
}
/*
+ * CB_GETATTR4args
+ * struct CB_GETATTR4args {
+ * nfs_fh4 fh;
+ * bitmap4 attr_request;
+ * };
+ *
+ * The size and change attributes are the only one
+ * guaranteed to be serviced by the client.
+ */
+static void
+encode_cb_getattr4args(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr,
+ struct nfs4_cb_fattr *fattr)
+{
+ struct nfs4_delegation *dp =
+ container_of(fattr, struct nfs4_delegation, dl_cb_fattr);
+ struct knfsd_fh *fh = &dp->dl_stid.sc_file->fi_fhandle;
+
+ encode_nfs_cb_opnum4(xdr, OP_CB_GETATTR);
+ encode_nfs_fh4(xdr, fh);
+ encode_bitmap4(xdr, fattr->ncf_cb_bmap, ARRAY_SIZE(fattr->ncf_cb_bmap));
+ hdr->nops++;
+}
+
+/*
* CB_SEQUENCE4args
*
* struct CB_SEQUENCE4args {
@@ -469,6 +507,26 @@ static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
}
/*
+ * 20.1. Operation 3: CB_GETATTR - Get Attributes
+ */
+static void nfs4_xdr_enc_cb_getattr(struct rpc_rqst *req,
+ struct xdr_stream *xdr, const void *data)
+{
+ const struct nfsd4_callback *cb = data;
+ struct nfs4_cb_fattr *ncf =
+ container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
+ struct nfs4_cb_compound_hdr hdr = {
+ .ident = cb->cb_clp->cl_cb_ident,
+ .minorversion = cb->cb_clp->cl_minorversion,
+ };
+
+ encode_cb_compound4args(xdr, &hdr);
+ encode_cb_sequence4args(xdr, cb, &hdr);
+ encode_cb_getattr4args(xdr, &hdr, ncf);
+ encode_cb_nops(&hdr);
+}
+
+/*
* 20.2. Operation 4: CB_RECALL - Recall a Delegation
*/
static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
@@ -524,6 +582,42 @@ static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
}
/*
+ * 20.1. Operation 3: CB_GETATTR - Get Attributes
+ */
+static int nfs4_xdr_dec_cb_getattr(struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr,
+ void *data)
+{
+ struct nfsd4_callback *cb = data;
+ struct nfs4_cb_compound_hdr hdr;
+ int status;
+ u32 bitmap[3] = {0};
+ u32 attrlen;
+ struct nfs4_cb_fattr *ncf =
+ container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
+
+ status = decode_cb_compound4res(xdr, &hdr);
+ if (unlikely(status))
+ return status;
+
+ status = decode_cb_sequence4res(xdr, cb);
+ if (unlikely(status || cb->cb_seq_status))
+ return status;
+
+ status = decode_cb_op_status(xdr, OP_CB_GETATTR, &cb->cb_status);
+ if (status)
+ return status;
+ if (xdr_stream_decode_uint32_array(xdr, bitmap, 3) < 0)
+ return -NFSERR_BAD_XDR;
+ if (xdr_stream_decode_u32(xdr, &attrlen) < 0)
+ return -NFSERR_BAD_XDR;
+ if (attrlen > (sizeof(ncf->ncf_cb_change) + sizeof(ncf->ncf_cb_fsize)))
+ return -NFSERR_BAD_XDR;
+ status = decode_cb_fattr4(xdr, bitmap, ncf);
+ return status;
+}
+
+/*
* 20.2. Operation 4: CB_RECALL - Recall a Delegation
*/
static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
@@ -831,6 +925,7 @@ static const struct rpc_procinfo nfs4_cb_procedures[] = {
PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
PROC(CB_RECALL_ANY, COMPOUND, cb_recall_any, cb_recall_any),
+ PROC(CB_GETATTR, COMPOUND, cb_getattr, cb_getattr),
};
static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
@@ -887,7 +982,16 @@ static struct workqueue_struct *callback_wq;
static bool nfsd4_queue_cb(struct nfsd4_callback *cb)
{
- return queue_work(callback_wq, &cb->cb_work);
+ trace_nfsd_cb_queue(cb->cb_clp, cb);
+ return queue_delayed_work(callback_wq, &cb->cb_work, 0);
+}
+
+static void nfsd4_queue_cb_delayed(struct nfsd4_callback *cb,
+ unsigned long msecs)
+{
+ trace_nfsd_cb_queue(cb->cb_clp, cb);
+ queue_delayed_work(callback_wq, &cb->cb_work,
+ msecs_to_jiffies(msecs));
}
static void nfsd41_cb_inflight_begin(struct nfs4_client *clp)
@@ -999,18 +1103,18 @@ static void nfsd4_mark_cb_state(struct nfs4_client *clp, int newstate)
{
if (clp->cl_cb_state != newstate) {
clp->cl_cb_state = newstate;
- trace_nfsd_cb_state(clp);
+ trace_nfsd_cb_new_state(clp);
}
}
-static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
+static void nfsd4_mark_cb_down(struct nfs4_client *clp)
{
if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
return;
nfsd4_mark_cb_state(clp, NFSD4_CB_DOWN);
}
-static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
+static void nfsd4_mark_cb_fault(struct nfs4_client *clp)
{
if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
return;
@@ -1022,7 +1126,7 @@ static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
if (task->tk_status)
- nfsd4_mark_cb_down(clp, task->tk_status);
+ nfsd4_mark_cb_down(clp);
else
nfsd4_mark_cb_state(clp, NFSD4_CB_UP);
}
@@ -1106,6 +1210,7 @@ static void nfsd41_destroy_cb(struct nfsd4_callback *cb)
{
struct nfs4_client *clp = cb->cb_clp;
+ trace_nfsd_cb_destroy(clp, cb);
nfsd41_cb_release_slot(cb);
if (cb->cb_ops && cb->cb_ops->release)
cb->cb_ops->release(cb);
@@ -1158,6 +1263,8 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
if (!cb->cb_holds_slot)
goto need_restart;
+ /* This is the operation status code for CB_SEQUENCE */
+ trace_nfsd_cb_seq_status(task, cb);
switch (cb->cb_seq_status) {
case 0:
/*
@@ -1171,13 +1278,23 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
break;
case -ESERVERFAULT:
++session->se_cb_seq_nr;
- fallthrough;
+ nfsd4_mark_cb_fault(cb->cb_clp);
+ ret = false;
+ break;
case 1:
+ /*
+ * cb_seq_status remains 1 if an RPC Reply was never
+ * received. NFSD can't know if the client processed
+ * the CB_SEQUENCE operation. Ask the client to send a
+ * DESTROY_SESSION to recover.
+ */
+ fallthrough;
case -NFS4ERR_BADSESSION:
- nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
+ nfsd4_mark_cb_fault(cb->cb_clp);
ret = false;
- break;
+ goto need_restart;
case -NFS4ERR_DELAY:
+ cb->cb_seq_status = 1;
if (!rpc_restart_call(task))
goto out;
@@ -1192,14 +1309,11 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
}
break;
default:
- nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
- dprintk("%s: unprocessed error %d\n", __func__,
- cb->cb_seq_status);
+ nfsd4_mark_cb_fault(cb->cb_clp);
}
-
nfsd41_cb_release_slot(cb);
- dprintk("%s: freed slot, new seqid=%d\n", __func__,
- clp->cl_cb_session->se_cb_seq_nr);
+
+ trace_nfsd_cb_free_slot(task, cb);
if (RPC_SIGNALLED(task))
goto need_restart;
@@ -1211,6 +1325,7 @@ retry_nowait:
goto out;
need_restart:
if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
+ trace_nfsd_cb_restart(clp, cb);
task->tk_status = 0;
cb->cb_need_restart = true;
}
@@ -1240,7 +1355,7 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
case -EIO:
case -ETIMEDOUT:
case -EACCES:
- nfsd4_mark_cb_down(clp, task->tk_status);
+ nfsd4_mark_cb_down(clp);
}
break;
default:
@@ -1295,12 +1410,13 @@ void nfsd4_shutdown_callback(struct nfs4_client *clp)
nfsd41_cb_inflight_wait_complete(clp);
}
-/* requires cl_lock: */
static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
{
struct nfsd4_session *s;
struct nfsd4_conn *c;
+ lockdep_assert_held(&clp->cl_lock);
+
list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
list_for_each_entry(c, &s->se_conns, cn_persession) {
if (c->cn_flags & NFS4_CDFC4_BACK)
@@ -1324,11 +1440,14 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
struct nfsd4_conn *c;
int err;
+ trace_nfsd_cb_bc_update(clp, cb);
+
/*
* This is either an update, or the client dying; in either case,
* kill the old client:
*/
if (clp->cl_cb_client) {
+ trace_nfsd_cb_bc_shutdown(clp, cb);
rpc_shutdown_client(clp->cl_cb_client);
clp->cl_cb_client = NULL;
put_cred(clp->cl_cb_cred);
@@ -1340,13 +1459,15 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
}
if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
return;
+
spin_lock(&clp->cl_lock);
/*
* Only serialized callback code is allowed to clear these
* flags; main nfsd code can only set them:
*/
- BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
+ WARN_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
+
memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
c = __nfsd4_find_backchannel(clp);
if (c) {
@@ -1358,7 +1479,7 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
err = setup_callback_client(clp, &conn, ses);
if (err) {
- nfsd4_mark_cb_down(clp, err);
+ nfsd4_mark_cb_down(clp);
if (c)
svc_xprt_put(c->cn_xprt);
return;
@@ -1369,25 +1490,28 @@ static void
nfsd4_run_cb_work(struct work_struct *work)
{
struct nfsd4_callback *cb =
- container_of(work, struct nfsd4_callback, cb_work);
+ container_of(work, struct nfsd4_callback, cb_work.work);
struct nfs4_client *clp = cb->cb_clp;
struct rpc_clnt *clnt;
int flags;
- if (cb->cb_need_restart) {
- cb->cb_need_restart = false;
- } else {
- if (cb->cb_ops && cb->cb_ops->prepare)
- cb->cb_ops->prepare(cb);
- }
+ trace_nfsd_cb_start(clp);
if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
nfsd4_process_cb_update(cb);
clnt = clp->cl_cb_client;
if (!clnt) {
- /* Callback channel broken, or client killed; give up: */
- nfsd41_destroy_cb(cb);
+ if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
+ nfsd41_destroy_cb(cb);
+ else {
+ /*
+ * XXX: Ideally, we could wait for the client to
+ * reconnect, but I haven't figured out how
+ * to do that yet.
+ */
+ nfsd4_queue_cb_delayed(cb, 25);
+ }
return;
}
@@ -1400,6 +1524,12 @@ nfsd4_run_cb_work(struct work_struct *work)
return;
}
+ if (cb->cb_need_restart) {
+ cb->cb_need_restart = false;
+ } else {
+ if (cb->cb_ops && cb->cb_ops->prepare)
+ cb->cb_ops->prepare(cb);
+ }
cb->cb_msg.rpc_cred = clp->cl_cb_cred;
flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN;
rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags,
@@ -1414,8 +1544,7 @@ void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
cb->cb_msg.rpc_argp = cb;
cb->cb_msg.rpc_resp = cb;
cb->cb_ops = ops;
- INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
- cb->cb_seq_status = 1;
+ INIT_DELAYED_WORK(&cb->cb_work, nfsd4_run_cb_work);
cb->cb_status = 0;
cb->cb_need_restart = false;
cb->cb_holds_slot = false;
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-06 14:31:05 +0300