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NFSD: Record each NFSv4 call's session slot index

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Help the client resolve the race between the reply to an
asynchronous COPY reply and the associated CB_OFFLOAD callback by
planting the session, slot, and sequence number of the COPY in the
CB_SEQUENCE contained in the CB_OFFLOAD COMPOUND.

Suggested-by: Trond Myklebust <trondmy@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2025-03-01 13:31:51 -05:00
parent 281ae67c94
commit b53a42970f
2 changed files with 13 additions and 0 deletions
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9
fs/nfsd/nfs4proc.c
View File

@@ -1716,6 +1716,7 @@ static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
return 0;
}
}
nfsd41_cb_destroy_referring_call_list(cb);
return 1;
}
@@ -1848,6 +1849,9 @@ static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
NFSPROC4_CLNT_CB_OFFLOAD);
nfsd41_cb_referring_call(&cbo->co_cb, &cbo->co_referring_sessionid,
cbo->co_referring_slotid,
cbo->co_referring_seqno);
trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
&cbo->co_fh, copy->cp_count, copy->nfserr);
nfsd4_try_run_cb(&cbo->co_cb);
@@ -1964,6 +1968,11 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
memcpy(&result->cb_stateid, &copy->cp_stateid.cs_stid,
sizeof(result->cb_stateid));
dup_copy_fields(copy, async_copy);
memcpy(async_copy->cp_cb_offload.co_referring_sessionid.data,
cstate->session->se_sessionid.data,
NFS4_MAX_SESSIONID_LEN);
async_copy->cp_cb_offload.co_referring_slotid = cstate->slot->sl_index;
async_copy->cp_cb_offload.co_referring_seqno = cstate->slot->sl_seqid;
async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
async_copy, "%s", "copy thread");
if (IS_ERR(async_copy->copy_task))

4
fs/nfsd/xdr4.h
View File

@@ -676,6 +676,10 @@ struct nfsd4_cb_offload {
__be32 co_nfserr;
unsigned int co_retries;
struct knfsd_fh co_fh;
struct nfs4_sessionid co_referring_sessionid;
u32 co_referring_slotid;
u32 co_referring_seqno;
};
struct nfsd4_copy {