[PATCH 6.1 0185/1146] NFSD: pass range end to vfs_fsync_range() instead of count

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From: Brian Foster <bfoster@xxxxxxxxxx>

[ Upstream commit 79a1d88a36f77374c77fd41a4386d8c2736b8704 ]

_nfsd_copy_file_range() calls vfs_fsync_range() with an offset and
count (bytes written), but the former wants the start and end bytes
of the range to sync. Fix it up.

Fixes: eac0b17a77fb ("NFSD add vfs_fsync after async copy is done")
Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
Tested-by: Dai Ngo <dai.ngo@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/nfsd/nfs4proc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index e91d0918592c..32fe7cbfb28b 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1646,6 +1646,7 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
 	u64 src_pos = copy->cp_src_pos;
 	u64 dst_pos = copy->cp_dst_pos;
 	int status;
+	loff_t end;
 
 	/* See RFC 7862 p.67: */
 	if (bytes_total == 0)
@@ -1665,8 +1666,8 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
 	/* for a non-zero asynchronous copy do a commit of data */
 	if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
 		since = READ_ONCE(dst->f_wb_err);
-		status = vfs_fsync_range(dst, copy->cp_dst_pos,
-					 copy->cp_res.wr_bytes_written, 0);
+		end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
+		status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
 		if (!status)
 			status = filemap_check_wb_err(dst->f_mapping, since);
 		if (!status)
-- 
2.35.1






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