bcachefs: Don't use inode btree key cache in fsck code

We had a cache coherency bug with the btree key cache in the fsck code -
this fixes fsck to be consistent about not using it.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/fsck.c

@@ -58,7 +58,7 @@ static int __remove_dirent(struct btree_trans *trans,
 	buf[name.len] = '\0';
 	name.name = buf;
 
-	ret = bch2_inode_find_by_inum_trans(trans, dir_inum, &dir_inode);
+	ret = __bch2_inode_find_by_inum_trans(trans, dir_inum, &dir_inode, 0);
 	if (ret && ret != -EINTR)
 		bch_err(c, "remove_dirent: err %i looking up directory inode", ret);
 	if (ret)
@@ -126,8 +126,8 @@ static int walk_inode(struct btree_trans *trans,
 		      struct inode_walker *w, u64 inum)
 {
 	if (inum != w->cur_inum) {
-		int ret = bch2_inode_find_by_inum_trans(trans, inum,
-							&w->inode);
+		int ret = __bch2_inode_find_by_inum_trans(trans, inum,
+							  &w->inode, 0);
 
 		if (ret && ret != -ENOENT)
 			return ret;
@@ -673,7 +673,7 @@ static int check_dirents(struct bch_fs *c)
 			continue;
 		}
 
-		ret = bch2_inode_find_by_inum_trans(&trans, d_inum, &target);
+		ret = __bch2_inode_find_by_inum_trans(&trans, d_inum, &target, 0);
 		if (ret && ret != -ENOENT)
 			break;
 
@@ -787,7 +787,9 @@ static int check_root(struct bch_fs *c, struct bch_inode_unpacked *root_inode)
 
 	bch_verbose(c, "checking root directory");
 
-	ret = bch2_inode_find_by_inum(c, BCACHEFS_ROOT_INO, root_inode);
+	ret = bch2_trans_do(c, NULL, NULL, 0,
+		__bch2_inode_find_by_inum_trans(&trans, BCACHEFS_ROOT_INO,
+						root_inode, 0));
 	if (ret && ret != -ENOENT)
 		return ret;
 
@@ -834,7 +836,8 @@ static int check_lostfound(struct bch_fs *c,
 		goto create_lostfound;
 	}
 
-	ret = bch2_inode_find_by_inum(c, inum, lostfound_inode);
+	ret = bch2_trans_do(c, NULL, NULL, 0,
+		__bch2_inode_find_by_inum_trans(&trans, inum, lostfound_inode, 0));
 	if (ret && ret != -ENOENT)
 		return ret;
 

fs/bcachefs/inode.c

@@ -628,16 +628,19 @@ int bch2_inode_rm(struct bch_fs *c, u64 inode_nr, bool cached)
 	return ret;
 }
 
-int bch2_inode_find_by_inum_trans(struct btree_trans *trans, u64 inode_nr,
-				  struct bch_inode_unpacked *inode)
+int __bch2_inode_find_by_inum_trans(struct btree_trans *trans, u64 inode_nr,
+				    struct bch_inode_unpacked *inode,
+				    unsigned flags)
 {
 	struct btree_iter *iter;
 	struct bkey_s_c k;
 	int ret;
 
 	iter = bch2_trans_get_iter(trans, BTREE_ID_INODES,
-			POS(0, inode_nr), BTREE_ITER_CACHED);
-	k = bch2_btree_iter_peek_cached(iter);
+			POS(0, inode_nr), flags);
+	k = (flags & BTREE_ITER_TYPE) == BTREE_ITER_CACHED
+		? bch2_btree_iter_peek_cached(iter)
+		: bch2_btree_iter_peek_slot(iter);
 	ret = bkey_err(k);
 	if (ret)
 		goto err;
@@ -650,6 +653,14 @@ int bch2_inode_find_by_inum_trans(struct btree_trans *trans, u64 inode_nr,
 	return ret;
 }
 
+int bch2_inode_find_by_inum_trans(struct btree_trans *trans, u64 inode_nr,
+				  struct bch_inode_unpacked *inode)
+{
+	return __bch2_inode_find_by_inum_trans(trans, inode_nr,
+					       inode, BTREE_ITER_CACHED);
+
+}
+
 int bch2_inode_find_by_inum(struct bch_fs *c, u64 inode_nr,
 			    struct bch_inode_unpacked *inode)
 {

fs/bcachefs/inode.h

@@ -73,6 +73,8 @@ int bch2_inode_create(struct btree_trans *, struct bch_inode_unpacked *);
 
 int bch2_inode_rm(struct bch_fs *, u64, bool);
 
+int __bch2_inode_find_by_inum_trans(struct btree_trans *, u64,
+				    struct bch_inode_unpacked *, unsigned);
 int bch2_inode_find_by_inum_trans(struct btree_trans *, u64,
 				  struct bch_inode_unpacked *);
 int bch2_inode_find_by_inum(struct bch_fs *, u64, struct bch_inode_unpacked *);