bcachefs: bch2_dev_have_ref()

bch2_dev_bkey_exists() is going away; bch2_dev_have_ref() documents that
we're looking up a device without checking if it's present because we
have a reference to it already.

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

Author: Kent Overstreet

fs/bcachefs/data_update.c

@@ -360,7 +360,7 @@ void bch2_data_update_exit(struct data_update *update)
 		bch2_bkey_ptrs_c(bkey_i_to_s_c(update->k.k));
 
 	bkey_for_each_ptr(ptrs, ptr) {
-		struct bch_dev *ca = bch2_dev_bkey_exists(c, ptr->dev);
+		struct bch_dev *ca = bch2_dev_have_ref(c, ptr->dev);
 		if (c->opts.nocow_enabled)
 			bch2_bucket_nocow_unlock(&c->nocow_locks,
 						 PTR_BUCKET_POS(ca, ptr), 0);
@@ -559,7 +559,7 @@ int bch2_data_update_init(struct btree_trans *trans,
 
 	i = 0;
 	bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
-		struct bch_dev *ca = bch2_dev_bkey_exists(c, p.ptr.dev);
+		struct bch_dev *ca = bch2_dev_have_ref(c, p.ptr.dev);
 		struct bpos bucket = PTR_BUCKET_POS(ca, &p.ptr);
 		bool locked;
 
@@ -664,7 +664,7 @@ int bch2_data_update_init(struct btree_trans *trans,
 err:
 	i = 0;
 	bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
-		struct bch_dev *ca = bch2_dev_bkey_exists(c, p.ptr.dev);
+		struct bch_dev *ca = bch2_dev_have_ref(c, p.ptr.dev);
 		struct bpos bucket = PTR_BUCKET_POS(ca, &p.ptr);
 		if ((1U << i) & ptrs_locked)
 			bch2_bucket_nocow_unlock(&c->nocow_locks, bucket, 0);

fs/bcachefs/io_write.c

@@ -1303,7 +1303,7 @@ static void bch2_nocow_write(struct bch_write_op *op)
 			bch2_cut_back(POS(op->pos.inode, op->pos.offset + bio_sectors(bio)), op->insert_keys.top);
 
 		darray_for_each(buckets, i) {
-			struct bch_dev *ca = bch2_dev_bkey_exists(c, i->b.inode);
+			struct bch_dev *ca = bch2_dev_have_ref(c, i->b.inode);
 
 			__bch2_bucket_nocow_lock(&c->nocow_locks, i->l,
 						 bucket_to_u64(i->b),
@@ -1380,7 +1380,7 @@ static void bch2_nocow_write(struct bch_write_op *op)
 	return;
 err_get_ioref:
 	darray_for_each(buckets, i)
-		percpu_ref_put(&bch2_dev_bkey_exists(c, i->b.inode)->io_ref);
+		percpu_ref_put(&bch2_dev_have_ref(c, i->b.inode)->io_ref);
 
 	/* Fall back to COW path: */
 	goto out;

fs/bcachefs/journal_io.c

@@ -1386,7 +1386,7 @@ int bch2_journal_read(struct bch_fs *c,
 			continue;
 
 		darray_for_each(i->ptrs, ptr) {
-			struct bch_dev *ca = bch2_dev_bkey_exists(c, ptr->dev);
+			struct bch_dev *ca = bch2_dev_have_ref(c, ptr->dev);
 
 			if (!ptr->csum_good)
 				bch_err_dev_offset(ca, ptr->sector,
@@ -1396,7 +1396,7 @@ int bch2_journal_read(struct bch_fs *c,
 		}
 
 		ret = jset_validate(c,
-				    bch2_dev_bkey_exists(c, i->ptrs.data[0].dev),
+				    bch2_dev_have_ref(c, i->ptrs.data[0].dev),
 				    &i->j,
 				    i->ptrs.data[0].sector,
 				    READ);