ksmbd: preserve data during overlapping copy chunk

Copying an overlapping range within the same file through
do_splice_direct() can overwrite source data that has not yet been
read. This corrupts the destination when the target range starts
inside and after the source range.

Handle overlapping ranges with a bounded temporary buffer. Copy from
the end when the destination follows the source and from the beginning
otherwise, providing memmove semantics without allocating the entire
copy length.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions