bcachefs: Drop old maybe_extending optimization

The extend update path had an optimization to avoid updating the inode
if we knew we were definitely not extending the file. But now that we're
updating inodes on every extent update - for fsync - that code can be
deleted.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/data_update.c

@@ -126,7 +126,7 @@ int bch2_data_update_index_update(struct bch_write_op *op)
 		struct extent_ptr_decoded p;
 		struct bpos next_pos;
 		bool did_work = false;
-		bool extending = false, should_check_enospc;
+		bool should_check_enospc;
 		s64 i_sectors_delta = 0, disk_sectors_delta = 0;
 		unsigned i;
 
@@ -212,7 +212,6 @@ int bch2_data_update_index_update(struct bch_write_op *op)
 		bch2_extent_normalize(c, bkey_i_to_s(insert));
 
 		ret = bch2_sum_sector_overwrites(&trans, &iter, insert,
-						 &extending,
 						 &should_check_enospc,
 						 &i_sectors_delta,
 						 &disk_sectors_delta);

fs/bcachefs/io.c

@@ -198,7 +198,6 @@ void bch2_bio_alloc_pages_pool(struct bch_fs *c, struct bio *bio,
 int bch2_sum_sector_overwrites(struct btree_trans *trans,
 			       struct btree_iter *extent_iter,
 			       struct bkey_i *new,
-			       bool *maybe_extending,
 			       bool *usage_increasing,
 			       s64 *i_sectors_delta,
 			       s64 *disk_sectors_delta)
@@ -210,7 +209,6 @@ int bch2_sum_sector_overwrites(struct btree_trans *trans,
 	bool new_compressed = bch2_bkey_sectors_compressed(bkey_i_to_s_c(new));
 	int ret = 0;
 
-	*maybe_extending	= true;
 	*usage_increasing	= false;
 	*i_sectors_delta	= 0;
 	*disk_sectors_delta	= 0;
@@ -237,31 +235,8 @@ int bch2_sum_sector_overwrites(struct btree_trans *trans,
 		     (!new_compressed && bch2_bkey_sectors_compressed(old))))
 			*usage_increasing = true;
 
-		if (bkey_ge(old.k->p, new->k.p)) {
-			/*
-			 * Check if there's already data above where we're
-			 * going to be writing to - this means we're definitely
-			 * not extending the file:
-			 *
-			 * Note that it's not sufficient to check if there's
-			 * data up to the sector offset we're going to be
-			 * writing to, because i_size could be up to one block
-			 * less:
-			 */
-			if (!bkey_cmp(old.k->p, new->k.p)) {
-				old = bch2_btree_iter_next(&iter);
-				ret = bkey_err(old);
-				if (ret)
-					break;
-			}
-
-			if (old.k && !bkey_err(old) &&
-			    old.k->p.inode == extent_iter->pos.inode &&
-			    bkey_extent_is_data(old.k))
-				*maybe_extending = false;
-
+		if (bkey_ge(old.k->p, new->k.p))
 			break;
-		}
 	}
 
 	bch2_trans_iter_exit(trans, &iter);
@@ -283,7 +258,7 @@ int bch2_extent_update(struct btree_trans *trans,
 	struct bch_inode_unpacked inode_u;
 	struct bpos next_pos;
 	struct bkey_s_c inode;
-	bool extending = false, usage_increasing;
+	bool usage_increasing;
 	s64 i_sectors_delta = 0, disk_sectors_delta = 0;
 	int ret;
 
@@ -305,7 +280,6 @@ int bch2_extent_update(struct btree_trans *trans,
 	next_pos = k->k.p;
 
 	ret = bch2_sum_sector_overwrites(trans, iter, k,
-			&extending,
 			&usage_increasing,
 			&i_sectors_delta,
 			&disk_sectors_delta);
@@ -322,10 +296,6 @@ int bch2_extent_update(struct btree_trans *trans,
 			return ret;
 	}
 
-	new_i_size = extending
-		? min(k->k.p.offset << 9, new_i_size)
-		: 0;
-
 	bch2_trans_iter_init(trans, &inode_iter, BTREE_ID_inodes,
 			     SPOS(0, inum.inum, iter->snapshot),
 			     BTREE_ITER_INTENT|

fs/bcachefs/io.h

@@ -70,7 +70,7 @@ static inline struct workqueue_struct *index_update_wq(struct bch_write_op *op)
 }
 
 int bch2_sum_sector_overwrites(struct btree_trans *, struct btree_iter *,
-			       struct bkey_i *, bool *, bool *, s64 *, s64 *);
+			       struct bkey_i *, bool *, s64 *, s64 *);
 int bch2_extent_update(struct btree_trans *, subvol_inum,
 		       struct btree_iter *, struct bkey_i *,
 		       struct disk_reservation *, u64, s64 *, bool);