bcachefs: Don't allocate stripes at POS_MIN

In the future, stripe index 0 will be a sentinal value. This patch
doesn't disallow stripes at POS_MIN yet, leaving that for when we do the
on disk format changes.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/bcachefs/bkey.h b/fs/bcachefs/bkey.h
index 5ce883ba22dc..f984064f4b5d 100644
--- a/fs/bcachefs/bkey.h
+++ b/fs/bcachefs/bkey.h
@@ -178,6 +178,11 @@ static inline struct bpos bpos_min(struct bpos l, struct bpos r)
 	return bkey_cmp(l, r) < 0 ? l : r;
 }
 
+static inline struct bpos bpos_max(struct bpos l, struct bpos r)
+{
+	return bkey_cmp(l, r) > 0 ? l : r;
+}
+
 void bch2_bpos_swab(struct bpos *);
 void bch2_bkey_swab_key(const struct bkey_format *, struct bkey_packed *);