[PATCH 07/15] vfs: skip zero-length dedupe requests

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From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Don't bother calling the filesystem for a zero-length dedupe request;
we can return zero and exit.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/read_write.c |    5 +++++
 1 file changed, 5 insertions(+)


diff --git a/fs/read_write.c b/fs/read_write.c
index 973d3da78c09..99b2f809180c 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1966,6 +1966,11 @@ int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
 	if (!dst_file->f_op->dedupe_file_range)
 		goto out_drop_write;
 
+	if (len == 0) {
+		ret = 0;
+		goto out_drop_write;
+	}
+
 	ret = dst_file->f_op->dedupe_file_range(src_file, src_pos,
 						dst_file, dst_pos, len);
 out_drop_write:




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