diff mbox series

[v2,12/15] NFSv4.2: Handle hole lengths that exceed the READ_PLUS read buffer

Message ID 20201211172521.5567-13-trondmy@kernel.org (mailing list archive)
State New
Headers show
Series Fixes for the NFSv4.2 READ_PLUS operation | expand

Commit Message

trondmy@kernel.org Dec. 11, 2020, 5:25 p.m. UTC
From: Trond Myklebust <trond.myklebust@hammerspace.com>

If a hole extends beyond the READ_PLUS read buffer, then we want to fill
just the remaining buffer with zeros. Also ignore eof...

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/nfs42xdr.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index f9faa131a4f5..6ba2a28e7e03 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -1080,6 +1080,12 @@  static int decode_read_plus_hole(struct xdr_stream *xdr,
 		}
 		length -= args->offset + res->count - offset;
 	}
+	if (length + res->count > args->count) {
+		*eof = 0;
+		if (unlikely(res->count >= args->count))
+			return 1;
+		length = args->count - res->count;
+	}
 	recvd = xdr_expand_hole(xdr, res->count, length);
 	res->count += recvd;