[PATCH 04/26] vfs: exit early from zero length remap operations

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

If a remap caller asks us to remap to the source file's EOF and the
source file has zero bytes, exit early.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/read_write.c |    2 ++
 1 file changed, 2 insertions(+)


diff --git a/fs/read_write.c b/fs/read_write.c
index d6e8e242a15f..2456da3f8a41 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1748,6 +1748,8 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in,
 		if (pos_in > isize)
 			return -EINVAL;
 		*len = isize - pos_in;
+		if (*len == 0)
+			return 0;
 	}
 
 	/* Check that we don't violate system file offset limits. */




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