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-rw-r--r--net/9p/client.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index b05f73c291..5cd94721d9 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -18,6 +18,7 @@
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#include <linux/uio.h>
+#include <linux/netfs.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
@@ -1663,6 +1664,54 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
}
EXPORT_SYMBOL(p9_client_write);
+void
+p9_client_write_subreq(struct netfs_io_subrequest *subreq)
+{
+ struct netfs_io_request *wreq = subreq->rreq;
+ struct p9_fid *fid = wreq->netfs_priv;
+ struct p9_client *clnt = fid->clnt;
+ struct p9_req_t *req;
+ unsigned long long start = subreq->start + subreq->transferred;
+ int written, len = subreq->len - subreq->transferred;
+ int err;
+
+ p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n",
+ fid->fid, start, len);
+
+ /* Don't bother zerocopy for small IO (< 1024) */
+ if (clnt->trans_mod->zc_request && len > 1024) {
+ req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter,
+ 0, wreq->len, P9_ZC_HDR_SZ, "dqd",
+ fid->fid, start, len);
+ } else {
+ req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
+ start, len, &subreq->io_iter);
+ }
+ if (IS_ERR(req)) {
+ netfs_write_subrequest_terminated(subreq, PTR_ERR(req), false);
+ return;
+ }
+
+ err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
+ if (err) {
+ trace_9p_protocol_dump(clnt, &req->rc);
+ p9_req_put(clnt, req);
+ netfs_write_subrequest_terminated(subreq, err, false);
+ return;
+ }
+
+ if (written > len) {
+ pr_err("bogus RWRITE count (%d > %u)\n", written, len);
+ written = len;
+ }
+
+ p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len);
+
+ p9_req_put(clnt, req);
+ netfs_write_subrequest_terminated(subreq, written, false);
+}
+EXPORT_SYMBOL(p9_client_write_subreq);
+
struct p9_wstat *p9_client_stat(struct p9_fid *fid)
{
int err;