diff --git a/src/fs/fugue/BFile_Ext_Stat.c b/src/fs/fugue/BFile_Ext_Stat.c
index bde0c2a..275a38e 100644
--- a/src/fs/fugue/BFile_Ext_Stat.c
+++ b/src/fs/fugue/BFile_Ext_Stat.c
@@ -1,4 +1,5 @@
 #include <gint/bfile.h>
+#include <gint/gint.h>
 #include "util.h"
 
 int BFile_Ext_Stat(uint16_t const *path, int *type, int *size)
@@ -7,6 +8,7 @@ int BFile_Ext_Stat(uint16_t const *path, int *type, int *size)
 	uint16_t found_file[256];
 	struct BFile_FileInfo fileinfo;
 
+    gint_world_enter(GINT_WORLD_OS);
 	rc = BFile_FindFirst(path, &search_handle, found_file, &fileinfo);
 	if(rc < 0) {
 		if(type) *type = -1;
@@ -20,5 +22,6 @@ int BFile_Ext_Stat(uint16_t const *path, int *type, int *size)
 	}
 
 	BFile_FindClose(search_handle);
+    gint_world_leave();
 	return rc;
 }
diff --git a/src/fs/fugue/fugue.c b/src/fs/fugue/fugue.c
index 00185da..b7cf505 100644
--- a/src/fs/fugue/fugue.c
+++ b/src/fs/fugue/fugue.c
@@ -2,6 +2,7 @@
 #include <gint/hardware.h>
 #include <gint/bfile.h>
 #include <gint/mmu.h>
+#include <gint/gint.h>
 #include <gint/defs/util.h>
 #include <string.h>
 #include <fcntl.h>
@@ -11,6 +12,8 @@
 
 ssize_t fugue_read(void *data0, void *buf, size_t size)
 {
+    gint_world_enter(GINT_WORLD_OS);
+
 	fugue_fd_t *data = data0;
 	int fugue_fd = data->fd;
 
@@ -22,9 +25,12 @@ ssize_t fugue_read(void *data0, void *buf, size_t size)
 	int rc = BFile_Read(fugue_fd, buf, size, -1);
 	if(rc < 0) {
 		errno = bfile_error_to_errno(rc);
-		return -1;
-	}
-	data->pos += rc;
+		size = -1;
+	} else {
+	    data->pos += rc;
+    }
+
+    gint_world_leave();
 	return size;
 }
 
@@ -62,6 +68,7 @@ ssize_t fugue_write(void *data0, const void *buf, size_t size)
 			return -1;
 		}
 
+        gint_world_enter(GINT_WORLD_OS);
 		while(written < size) {
 			size_t block_size = min(size - written, alloc_size);
 			memcpy(ram, buf + written, block_size);
@@ -79,24 +86,31 @@ ssize_t fugue_write(void *data0, const void *buf, size_t size)
 			/* Partial write */
 			if(rc < (int)block_size) break;
 		}
+        gint_world_leave();
 
 		free(ram);
 		return written;
 	}
 	/* Otherwise, we can write normally */
 	else {
+        gint_world_enter(GINT_WORLD_OS);
 		int rc = BFile_Write(fugue_fd, buf, size);
 		if(rc < 0) {
 			errno = bfile_error_to_errno(rc);
-			return -1;
-		}
-		data->pos += rc;
+			rc = -1;
+		} else {
+		    data->pos += rc;
+            rc = 0;
+        }
+        gint_world_leave();
 		return rc;
 	}
 }
 
 off_t fugue_lseek(void *data0, off_t offset, int whence)
 {
+    gint_world_enter(GINT_WORLD_OS);
+
 	fugue_fd_t *data = data0;
 	int fugue_fd = data->fd;
 
@@ -114,9 +128,12 @@ off_t fugue_lseek(void *data0, off_t offset, int whence)
 	int rc = BFile_Seek(fugue_fd, offset);
 	if(rc < 0) {
 		errno = bfile_error_to_errno(rc);
-		return -1;
-	}
-	data->pos = offset;
+		offset = -1;
+	} else {
+	    data->pos = offset;
+    }
+
+    gint_world_leave();
 
 	/* rc is the amount of space left in the file (including pre-allocated
 	   space), so instead just return offset directly */
@@ -125,16 +142,21 @@ off_t fugue_lseek(void *data0, off_t offset, int whence)
 
 int fugue_close(void *data0)
 {
+    gint_world_enter(GINT_WORLD_OS);
+
 	fugue_fd_t *data = data0;
 	int fugue_fd = data->fd;
 
 	int rc = BFile_Close(fugue_fd);
 	if(rc < 0) {
 		errno = bfile_error_to_errno(rc);
-		return -1;
-	}
+		rc = -1;
+	} else {
+        rc = 0;
+    }
+    gint_world_leave();
 	free(data);
-	return 0;
+	return rc;
 }
 
 const fs_descriptor_type_t fugue_descriptor_type = {
diff --git a/src/fs/fugue/fugue_dir.c b/src/fs/fugue/fugue_dir.c
index d8a8fc0..9dd218d 100644
--- a/src/fs/fugue/fugue_dir.c
+++ b/src/fs/fugue/fugue_dir.c
@@ -1,6 +1,7 @@
 #include <gint/fs.h>
 #include <gint/hardware.h>
 #include <gint/bfile.h>
+#include <gint/gint.h>
 #include <dirent.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -96,6 +97,8 @@ void *fugue_dir_explore(char const *path)
 	/* We allocate by batches of 8 */
 	int sd=-1, rc, allocated=0;
 
+    gint_world_enter(GINT_WORLD_OS);
+
 	dir_t *dp = malloc(sizeof *dp);
 	if(!dp) goto alloc_failure;
 
@@ -157,5 +160,6 @@ end:
 	free(fc_path);
 	if(sd >= 0)
 		BFile_FindClose(sd);
+    gint_world_leave();
 	return dp;
 }
diff --git a/src/fs/fugue/fugue_mkdir.c b/src/fs/fugue/fugue_mkdir.c
index 29f10b9..819ba8c 100644
--- a/src/fs/fugue/fugue_mkdir.c
+++ b/src/fs/fugue/fugue_mkdir.c
@@ -1,5 +1,6 @@
 #include <gint/hardware.h>
 #include <gint/bfile.h>
+#include <gint/gint.h>
 #include <gint/fs.h>
 #include <errno.h>
 #include "util.h"
@@ -14,13 +15,17 @@ int fugue_mkdir(char const *path, GUNUSED mode_t mode)
 		return -1;
 	}
 
+    gint_world_enter(GINT_WORLD_OS);
 	int rc = BFile_Create(fcpath, BFile_Folder, NULL);
 	if(rc < 0) {
 		errno = bfile_error_to_errno(rc);
 		free(fcpath);
-		return -1;
-	}
+		rc = -1;
+	} else {
+        rc = 0;
+    }
+    gint_world_leave();
 
 	free(fcpath);
-	return 0;
+	return rc;
 }
diff --git a/src/fs/fugue/fugue_open.c b/src/fs/fugue/fugue_open.c
index c9ecce4..89407d3 100644
--- a/src/fs/fugue/fugue_open.c
+++ b/src/fs/fugue/fugue_open.c
@@ -1,5 +1,6 @@
 #include <gint/fs.h>
 #include <gint/bfile.h>
+#include <gint/gint.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <string.h>
@@ -32,6 +33,8 @@ int fugue_open(char const *path, int flags, GUNUSED mode_t mode)
 	/* Truncation requires the file to be removed/recreated */
 	bool trunc = (flags & O_TRUNC) && (flags & O_CREAT);
 
+    gint_world_enter(GINT_WORLD_OS);
+
 	/* Stat the entry. A special case is needed for the root, which doesn't
 	   respond well. fs_path_normalize_fc() normalizes the path so we just
 	   have to check for the fixed string "\\fls0\". */
@@ -142,6 +145,7 @@ int fugue_open(char const *path, int flags, GUNUSED mode_t mode)
 	}
 
 end:
+    gint_world_leave();
 	free(fcpath);
 	return rc;
 }
diff --git a/src/fs/fugue/fugue_rename.c b/src/fs/fugue/fugue_rename.c
index 6eaded6..c77c77d 100644
--- a/src/fs/fugue/fugue_rename.c
+++ b/src/fs/fugue/fugue_rename.c
@@ -1,6 +1,7 @@
 #include <gint/hardware.h>
 #include <gint/bfile.h>
 #include <gint/fs.h>
+#include <gint/gint.h>
 #include <errno.h>
 #include <sys/stat.h>
 #include "util.h"
@@ -24,12 +25,15 @@ int fugue_rename(char const *oldpath, char const *newpath)
 		goto end;
 	}
 
+    gint_world_enter(GINT_WORLD_OS);
 	rc = BFile_Rename(fcpath_1, fcpath_2);
 	if(rc < 0) {
 		errno = bfile_error_to_errno(rc);
 		rc = -1;
-	}
-	else rc = 0;
+	} else {
+        rc = 0;
+    }
+    gint_world_leave();
 
 end:
 	free(fcpath_1);
diff --git a/src/fs/fugue/fugue_rmdir.c b/src/fs/fugue/fugue_rmdir.c
index ceff28e..878fe5a 100644
--- a/src/fs/fugue/fugue_rmdir.c
+++ b/src/fs/fugue/fugue_rmdir.c
@@ -1,6 +1,7 @@
 #include <gint/hardware.h>
 #include <gint/bfile.h>
 #include <gint/fs.h>
+#include <gint/gint.h>
 #include <errno.h>
 #include <dirent.h>
 #include <string.h>
@@ -39,12 +40,15 @@ int fugue_rmdir(char const *path)
 		return -1;
 	}
 
+    gint_world_enter(GINT_WORLD_OS);
 	int rc = BFile_Remove(fcpath);
 	if(rc < 0) {
 		errno = bfile_error_to_errno(rc);
 		rc = -1;
-	}
-	else rc = 0;
+	} else {
+        rc = 0;
+    }
+    gint_world_leave();
 
 	free(fcpath);
 	return rc;
diff --git a/src/fs/fugue/fugue_stat.c b/src/fs/fugue/fugue_stat.c
index 6cf43a9..afe0d76 100644
--- a/src/fs/fugue/fugue_stat.c
+++ b/src/fs/fugue/fugue_stat.c
@@ -1,5 +1,6 @@
 #include <sys/stat.h>
 #include <gint/fs.h>
+#include <gint/gint.h>
 #include <gint/bfile.h>
 #include "fugue.h"
 #include <errno.h>
@@ -17,7 +18,9 @@ int fugue_stat(char const * restrict path, struct stat * restrict statbuf)
 	}
 
 	int type, size, rc;
+    gint_world_enter(GINT_WORLD_OS);
 	rc = BFile_Ext_Stat(fcpath, &type, &size);
+    gint_world_leave();
 	free(fcpath);
 
 	if(rc < 0) {
diff --git a/src/fs/fugue/fugue_unlink.c b/src/fs/fugue/fugue_unlink.c
index cff9cb8..73f8c65 100644
--- a/src/fs/fugue/fugue_unlink.c
+++ b/src/fs/fugue/fugue_unlink.c
@@ -1,6 +1,7 @@
 #include <gint/hardware.h>
 #include <gint/bfile.h>
 #include <gint/fs.h>
+#include <gint/gint.h>
 #include <errno.h>
 #include <sys/stat.h>
 #include "util.h"
@@ -15,6 +16,8 @@ int fugue_unlink(char const *path)
 		return -1;
 	}
 
+    gint_world_enter(GINT_WORLD_OS);
+
 	int type, size, rc;
 	rc = BFile_Ext_Stat(fcpath, &type, &size);
 	if(rc < 0) {
@@ -36,6 +39,7 @@ int fugue_unlink(char const *path)
 	else rc = 0;
 
 end:
+    gint_world_leave();
 	free(fcpath);
 	return rc;
 }