bcache: Convert bch_btree_read_async() to bch_btree_map_keys()

This is a fairly straightforward conversion, mostly reshuffling -
op->lookup_done goes away, replaced by MAP_DONE/MAP_CONTINUE. And the
code for handling cache hits and misses wasn't really btree code, so it
gets moved to request.c.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>

1 files changed, 0 insertions, 133 deletions

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index bfd60e6a2312..3949673cb1b0 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -23,7 +23,6 @@
 #include "bcache.h"
 #include "btree.h"
 #include "debug.h"
-#include "request.h"
 #include "writeback.h"
 
 #include <linux/slab.h>
@@ -2255,138 +2254,6 @@ void bch_btree_set_root(struct btree *b)
 	closure_sync(&cl);
 }
 
-/* Cache lookup */
-
-static int submit_partial_cache_miss(struct btree *b, struct btree_op *op,
-				     struct bkey *k)
-{
-	struct search *s = container_of(op, struct search, op);
-	struct bio *bio = &s->bio.bio;
-	int ret = 0;
-
-	while (!ret &&
-	       !op->lookup_done) {
-		unsigned sectors = INT_MAX;
-
-		if (KEY_INODE(k) == op->inode) {
-			if (KEY_START(k) <= bio->bi_sector)
-				break;
-
-			sectors = min_t(uint64_t, sectors,
-					KEY_START(k) - bio->bi_sector);
-		}
-
-		ret = s->d->cache_miss(b, s, bio, sectors);
-	}
-
-	return ret;
-}
-
-/*
- * Read from a single key, handling the initial cache miss if the key starts in
- * the middle of the bio
- */
-static int submit_partial_cache_hit(struct btree *b, struct btree_op *op,
-				    struct bkey *k)
-{
-	struct search *s = container_of(op, struct search, op);
-	struct bio *bio = &s->bio.bio;
-	unsigned ptr;
-	struct bio *n;
-
-	int ret = submit_partial_cache_miss(b, op, k);
-	if (ret || op->lookup_done)
-		return ret;
-
-	/* XXX: figure out best pointer - for multiple cache devices */
-	ptr = 0;
-
-	PTR_BUCKET(b->c, k, ptr)->prio = INITIAL_PRIO;
-
-	while (!op->lookup_done &&
-	       KEY_INODE(k) == op->inode &&
-	       bio->bi_sector < KEY_OFFSET(k)) {
-		struct bkey *bio_key;
-		sector_t sector = PTR_OFFSET(k, ptr) +
-			(bio->bi_sector - KEY_START(k));
-		unsigned sectors = min_t(uint64_t, INT_MAX,
-					 KEY_OFFSET(k) - bio->bi_sector);
-
-		n = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
-		if (n == bio)
-			op->lookup_done = true;
-
-		bio_key = &container_of(n, struct bbio, bio)->key;
-
-		/*
-		 * The bucket we're reading from might be reused while our bio
-		 * is in flight, and we could then end up reading the wrong
-		 * data.
-		 *
-		 * We guard against this by checking (in cache_read_endio()) if
-		 * the pointer is stale again; if so, we treat it as an error
-		 * and reread from the backing device (but we don't pass that
-		 * error up anywhere).
-		 */
-
-		bch_bkey_copy_single_ptr(bio_key, k, ptr);
-		SET_PTR_OFFSET(bio_key, 0, sector);
-
-		n->bi_end_io	= bch_cache_read_endio;
-		n->bi_private	= &s->cl;
-
-		__bch_submit_bbio(n, b->c);
-	}
-
-	return 0;
-}
-
-static int bch_btree_search_recurse(struct btree *b, struct btree_op *op)
-{
-	struct search *s = container_of(op, struct search, op);
-	struct bio *bio = &s->bio.bio;
-
-	int ret = 0;
-	struct bkey *k;
-	struct btree_iter iter;
-	bch_btree_iter_init(b, &iter, &KEY(op->inode, bio->bi_sector, 0));
-
-	do {
-		k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad);
-		if (!k) {
-			/*
-			 * b->key would be exactly what we want, except that
-			 * pointers to btree nodes have nonzero size - we
-			 * wouldn't go far enough
-			 */
-
-			ret = submit_partial_cache_miss(b, op,
-					&KEY(KEY_INODE(&b->key),
-					     KEY_OFFSET(&b->key), 0));
-			break;
-		}
-
-		ret = b->level
-			? btree(search_recurse, k, b, op)
-			: submit_partial_cache_hit(b, op, k);
-	} while (!ret &&
-		 !op->lookup_done);
-
-	return ret;
-}
-
-void bch_btree_search_async(struct closure *cl)
-{
-	struct btree_op *op = container_of(cl, struct btree_op, cl);
-
-	int ret = btree_root(search_recurse, op->c, op);
-
-	if (ret == -EAGAIN)
-		continue_at(cl, bch_btree_search_async, bcache_wq);
-
-	closure_return(cl);
-}
-
 /* Map across nodes or keys */
 
 static int bch_btree_map_nodes_recurse(struct btree *b, struct btree_op *op,