net/9p: handle flushed Tclunk/Tremove
When a Tclunk or Tremove request is flushed, the fid is not freed on the
server.
p9_client_clunk() should retry once on interrupt, then if interrupted
again, leak the fid for the duration of the connection.
p9_client_remove() should call p9_client_clunk() on interrupt
instead of unconditionally destroying the fid.
Signed-off-by: Jim Garlick <garlick@llnl.gov>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/net/9p/client.c b/net/9p/client.c
index 6efbb33..b23a17c 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1428,6 +1428,7 @@
int err;
struct p9_client *clnt;
struct p9_req_t *req;
+ int retries = 0;
if (!fid) {
pr_warn("%s (%d): Trying to clunk with NULL fid\n",
@@ -1436,7 +1437,9 @@
return 0;
}
- p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
+again:
+ p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
+ retries);
err = 0;
clnt = fid->clnt;
@@ -1452,8 +1455,14 @@
error:
/*
* Fid is not valid even after a failed clunk
+ * If interrupted, retry once then give up and
+ * leak fid until umount.
*/
- p9_fid_destroy(fid);
+ if (err == -ERESTARTSYS) {
+ if (retries++ == 0)
+ goto again;
+ } else
+ p9_fid_destroy(fid);
return err;
}
EXPORT_SYMBOL(p9_client_clunk);
@@ -1478,7 +1487,10 @@
p9_free_req(clnt, req);
error:
- p9_fid_destroy(fid);
+ if (err == -ERESTARTSYS)
+ p9_client_clunk(fid);
+ else
+ p9_fid_destroy(fid);
return err;
}
EXPORT_SYMBOL(p9_client_remove);