From: Chuck Lever <chuck.lever@oracle.com>
To: linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: [PATCH v1 1/6] svcrdma: Fix page leak in svc_rdma_recv_read_chunk()
Date: Mon, 22 Jun 2020 17:01:05 -0400 [thread overview]
Message-ID: <20200622210105.2144.36726.stgit@klimt.1015granger.net> (raw)
In-Reply-To: <20200622205906.2144.43930.stgit@klimt.1015granger.net>
Commit 07d0ff3b0cd2 ("svcrdma: Clean up Read chunk path") moved the
page saver logic so that it gets executed event when an error occurs.
In that case, the I/O is never posted, and those pages are then
leaked. Errors in this path, however, are quite rare.
Fixes: 07d0ff3b0cd2 ("svcrdma: Clean up Read chunk path")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
net/sunrpc/xprtrdma/svc_rdma_rw.c | 28 +++++++++++++++++++++-------
1 file changed, 21 insertions(+), 7 deletions(-)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c
index 5eb35309ecef..83806fa94def 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_rw.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c
@@ -684,7 +684,6 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp,
struct svc_rdma_read_info *info,
__be32 *p)
{
- unsigned int i;
int ret;
ret = -EINVAL;
@@ -707,12 +706,6 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp,
info->ri_chunklen += rs_length;
}
- /* Pages under I/O have been copied to head->rc_pages.
- * Prevent their premature release by svc_xprt_release() .
- */
- for (i = 0; i < info->ri_readctxt->rc_page_count; i++)
- rqstp->rq_pages[i] = NULL;
-
return ret;
}
@@ -807,6 +800,26 @@ static int svc_rdma_build_pz_read_chunk(struct svc_rqst *rqstp,
return ret;
}
+/* Pages under I/O have been copied to head->rc_pages. Ensure they
+ * are not released by svc_xprt_release() until the I/O is complete.
+ *
+ * This has to be done after all Read WRs are constructed to properly
+ * handle a page that is part of I/O on behalf of two different RDMA
+ * segments.
+ *
+ * Do this only if I/O has been posted. Otherwise, we do indeed want
+ * svc_xprt_release() to clean things up properly.
+ */
+static void svc_rdma_save_io_pages(struct svc_rqst *rqstp,
+ const unsigned int start,
+ const unsigned int num_pages)
+{
+ unsigned int i;
+
+ for (i = start; i < num_pages + start; i++)
+ rqstp->rq_pages[i] = NULL;
+}
+
/**
* svc_rdma_recv_read_chunk - Pull a Read chunk from the client
* @rdma: controlling RDMA transport
@@ -860,6 +873,7 @@ int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma, struct svc_rqst *rqstp,
ret = svc_rdma_post_chunk_ctxt(&info->ri_cc);
if (ret < 0)
goto out_err;
+ svc_rdma_save_io_pages(rqstp, 0, head->rc_page_count);
return 0;
out_err:
next prev parent reply other threads:[~2020-06-22 21:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 21:00 [PATCH v1 0/6] Refactor path that sends error responses Chuck Lever
2020-06-22 21:01 ` Chuck Lever [this message]
2020-06-22 21:01 ` [PATCH v1 2/6] svcrdma: Remove save_io_pages() call from send_error_msg() Chuck Lever
2020-06-22 21:01 ` [PATCH v1 3/6] svcrdma: Add @rctxt parameter to svc_rdma_send_error() functions Chuck Lever
2020-06-22 21:01 ` [PATCH v1 4/6] svcrdma: Add a @status parameter to svc_rdma_send_error_msg() Chuck Lever
2020-06-22 21:01 ` [PATCH v1 5/6] svcrdma: Eliminate return value for svc_rdma_send_error_msg() Chuck Lever
2020-06-22 21:01 ` [PATCH v1 6/6] svcrdma: Make svc_rdma_send_error_msg() a global function Chuck Lever
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