bcachefs: Don't unnecessarily decrypt data when moving

There's various checks for "are we going to compress this" - but we're
not going to compress if we know it's incompressible.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/io_write.c b/fs/bcachefs/io_write.c
index 9613361a519ba55083a2eb45e43557add960367d..07b55839768ea9e3241598c63cc84ff3c5418b91 100644 (file)
--- a/fs/bcachefs/io_write.c
+++ b/fs/bcachefs/io_write.c
@@ -940,6 +940,9 @@ static int bch2_write_extent(struct bch_write_op *op, struct write_point *wp,
        bool page_alloc_failed = false;
        int ret, more = 0;
 
+       if (op->incompressible)
+               op->compression_opt = 0;
+
        BUG_ON(!bio_sectors(src));
 
        ec_buf = bch2_writepoint_ec_buf(c, wp);