bcachefs: Convert EROFS errors to private error codes

More error code improvements - this gets us more useful error messages.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc_foreground.c

@@ -1222,9 +1222,6 @@ int bch2_alloc_sectors_start_trans(struct btree_trans *trans,
 			? -EAGAIN
 			: -BCH_ERR_ENOSPC_bucket_alloc;
 
-	if (bch2_err_matches(ret, BCH_ERR_insufficient_devices))
-		return -EROFS;
-
 	return ret;
 }
 

fs/bcachefs/btree_gc.c

@@ -1988,7 +1988,7 @@ int bch2_gc_gens(struct bch_fs *c)
 					NULL, NULL,
 					BTREE_INSERT_NOFAIL,
 				gc_btree_gens_key(&trans, &iter, k));
-			if (ret && ret != -EROFS)
+			if (ret && !bch2_err_matches(ret, EROFS))
 				bch_err(c, "error recalculating oldest_gen: %s", bch2_err_str(ret));
 			if (ret)
 				goto err;
@@ -2001,7 +2001,7 @@ int bch2_gc_gens(struct bch_fs *c)
 			NULL, NULL,
 			BTREE_INSERT_NOFAIL,
 		bch2_alloc_write_oldest_gen(&trans, &iter, k));
-	if (ret && ret != -EROFS)
+	if (ret && !bch2_err_matches(ret, EROFS))
 		bch_err(c, "error writing oldest_gen: %s", bch2_err_str(ret));
 	if (ret)
 		goto err;

fs/bcachefs/btree_update_leaf.c

@@ -990,7 +990,7 @@ bch2_trans_commit_get_rw_cold(struct btree_trans *trans)
 
 	if (likely(!(trans->flags & BTREE_INSERT_LAZY_RW)) ||
 	    test_bit(BCH_FS_STARTED, &c->flags))
-		return -EROFS;
+		return -BCH_ERR_erofs_trans_commit;
 
 	bch2_trans_unlock(trans);
 

fs/bcachefs/ec.c

@@ -891,7 +891,7 @@ static void ec_stripe_create(struct ec_stripe_new *s)
 	closure_sync(&s->iodone);
 
 	if (s->err) {
-		if (s->err != -EROFS)
+		if (!bch2_err_matches(s->err, EROFS))
 			bch_err(c, "error creating stripe: error writing data buckets");
 		goto err;
 	}

fs/bcachefs/errcode.h

@@ -20,7 +20,6 @@
 	x(0,				open_buckets_empty)			\
 	x(0,				freelist_empty)				\
 	x(BCH_ERR_freelist_empty,	no_buckets_found)			\
-	x(0,				insufficient_devices)			\
 	x(0,				transaction_restart)			\
 	x(BCH_ERR_transaction_restart,	transaction_restart_fault_inject)	\
 	x(BCH_ERR_transaction_restart,	transaction_restart_relock)		\
@@ -80,6 +79,11 @@
 	x(EINVAL,			device_already_online)			\
 	x(EINVAL,			insufficient_devices_to_start)		\
 	x(EINVAL,			invalid)				\
+	x(EROFS,			erofs_trans_commit)			\
+	x(EROFS,			erofs_no_writes)			\
+	x(EROFS,			erofs_journal_err)			\
+	x(EROFS,			erofs_sb_err)				\
+	x(EROFS,			insufficient_devices)			\
 	x(BCH_ERR_invalid,		invalid_sb)				\
 	x(BCH_ERR_invalid_sb,		invalid_sb_magic)			\
 	x(BCH_ERR_invalid_sb,		invalid_sb_version)			\

fs/bcachefs/io.c

@@ -1417,7 +1417,7 @@ void bch2_write(struct closure *cl)
 
 	if (c->opts.nochanges ||
 	    !percpu_ref_tryget_live(&c->writes)) {
-		op->error = -EROFS;
+		op->error = -BCH_ERR_erofs_no_writes;
 		goto err;
 	}
 

fs/bcachefs/journal.c

@@ -363,7 +363,7 @@ static int __journal_res_get(struct journal *j, struct journal_res *res,
 		return 0;
 
 	if (bch2_journal_error(j))
-		return -EROFS;
+		return -BCH_ERR_erofs_journal_err;
 
 	spin_lock(&j->lock);
 

fs/bcachefs/move.c

@@ -251,7 +251,7 @@ static int bch2_move_extent(struct btree_trans *trans,
 	}
 
 	if (!percpu_ref_tryget_live(&c->writes))
-		return -EROFS;
+		return -BCH_ERR_erofs_no_writes;
 
 	/* write path might have to decompress data: */
 	bkey_for_each_ptr_decode(k.k, ptrs, p, entry)

fs/bcachefs/movinggc.c

@@ -319,7 +319,7 @@ static int bch2_copygc(struct bch_fs *c)
 			     writepoint_ptr(&c->copygc_write_point),
 			     false,
 			     copygc_pred, NULL);
-	if (ret < 0 && ret != -EROFS)
+	if (ret < 0 && !bch2_err_matches(ret, EROFS))
 		bch_err(c, "error from bch2_move_data() in copygc: %s", bch2_err_str(ret));
 	if (ret)
 		return ret;

fs/bcachefs/recovery.c

@@ -631,8 +631,8 @@ static int bch2_journal_replay(struct bch_fs *c, u64 start_seq, u64 end_seq)
 				     : 0),
 			     bch2_journal_replay_key(&trans, k));
 		if (ret) {
-			bch_err(c, "journal replay: error %d while replaying key at btree %s level %u",
-				ret, bch2_btree_ids[k->btree_id], k->level);
+			bch_err(c, "journal replay: error while replaying key at btree %s level %u: %s",
+				bch2_btree_ids[k->btree_id], k->level, bch2_err_str(ret));
 			goto err;
 		}
 	}

fs/bcachefs/reflink.c

@@ -283,7 +283,7 @@ s64 bch2_remap_range(struct bch_fs *c,
 	int ret = 0, ret2 = 0;
 
 	if (!percpu_ref_tryget_live(&c->writes))
-		return -EROFS;
+		return -BCH_ERR_erofs_no_writes;
 
 	bch2_check_set_feature(c, BCH_FEATURE_reflink);
 

fs/bcachefs/super-io.c

@@ -868,7 +868,7 @@ int bch2_write_super(struct bch_fs *c)
 				le64_to_cpu(ca->sb_read_scratch->seq),
 				ca->disk_sb.seq);
 			percpu_ref_put(&ca->io_ref);
-			ret = -EROFS;
+			ret = -BCH_ERR_erofs_sb_err;
 			goto out;
 		}
 
@@ -878,7 +878,7 @@ int bch2_write_super(struct bch_fs *c)
 				le64_to_cpu(ca->sb_read_scratch->seq),
 				ca->disk_sb.seq);
 			percpu_ref_put(&ca->io_ref);
-			ret = -EROFS;
+			ret = -BCH_ERR_erofs_sb_err;
 			goto out;
 		}
 	}