Commit 9aae2050 authored Oct 30, 2018 by Darrick J. Wong Committed by Dave Chinner Oct 30, 2018

vfs: skip zero-length dedupe requests



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@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

parent 07d19dc9

fs/read_write.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -2009,6 +2009,11 @@ 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: