bcache in userspace; userspace fsck

1 files changed, 55 insertions, 0 deletions

diff --git a/libbcache/keylist.c b/libbcache/keylist.c
new file mode 100644
index 0000000..adf5eeb
--- /dev/null
+++ b/libbcache/keylist.c
@@ -0,0 +1,55 @@
+
+#include "bcache.h"
+#include "keylist.h"
+
+int bch_keylist_realloc(struct keylist *l, u64 *inline_u64s,
+			size_t nr_inline_u64s, size_t new_u64s)
+{
+	size_t oldsize = bch_keylist_u64s(l);
+	size_t newsize = oldsize + new_u64s;
+	u64 *old_buf = l->keys_p == inline_u64s ? NULL : l->keys_p;
+	u64 *new_keys;
+
+	newsize = roundup_pow_of_two(newsize);
+
+	if (newsize <= nr_inline_u64s ||
+	    (old_buf && roundup_pow_of_two(oldsize) == newsize))
+		return 0;
+
+	new_keys = krealloc(old_buf, sizeof(u64) * newsize, GFP_NOIO);
+	if (!new_keys)
+		return -ENOMEM;
+
+	if (!old_buf)
+		memcpy_u64s(new_keys, inline_u64s, oldsize);
+
+	l->keys_p = new_keys;
+	l->top_p = new_keys + oldsize;
+
+	return 0;
+}
+
+void bch_keylist_add_in_order(struct keylist *l, struct bkey_i *insert)
+{
+	struct bkey_i *where;
+
+	for_each_keylist_key(l, where)
+		if (bkey_cmp(insert->k.p, where->k.p) < 0)
+			break;
+
+	memmove_u64s_up((u64 *) where + insert->k.u64s,
+			where,
+			((u64 *) l->top) - ((u64 *) where));
+
+	l->top_p += insert->k.u64s;
+	bkey_copy(where, insert);
+}
+
+void bch_keylist_pop_front(struct keylist *l)
+{
+	l->top_p -= bch_keylist_front(l)->k.u64s;
+
+	memmove_u64s_down(l->keys,
+			  bkey_next(l->keys),
+			  bch_keylist_u64s(l));
+}