diff --git a/nx/include/switch/services/fs.h b/nx/include/switch/services/fs.h
index 859dfdc9..0ff39bf5 100644
--- a/nx/include/switch/services/fs.h
+++ b/nx/include/switch/services/fs.h
@@ -199,6 +199,9 @@ void fsDirClose(FsDir* d);
 
 // IStorage
 Result fsStorageRead(FsStorage* s, u64 off, void* buf, size_t len);
+Result fsStorageWrite(FsStorage* s, u64 off, const void* buf, size_t len);
+Result fsStorageFlush(FsStorage* s);
+Result fsStorageSetSize(FsStorage* s, u64 sz);
 Result fsStorageGetSize(FsStorage* s, u64* out);
 void fsStorageClose(FsStorage* s);
 
diff --git a/nx/source/services/fs.c b/nx/source/services/fs.c
index 8acb4ae1..af84dfe6 100644
--- a/nx/source/services/fs.c
+++ b/nx/source/services/fs.c
@@ -1175,6 +1175,106 @@ Result fsStorageRead(FsStorage* s, u64 off, void* buf, size_t len) {
     return rc;
 }
 
+Result fsStorageWrite(FsStorage* s, u64 off, const void* buf, size_t len) {
+    IpcCommand c;
+    ipcInitialize(&c);
+    ipcAddSendBuffer(&c, buf, len, 1);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+        u64 offset;
+        u64 write_size;
+    } *raw;
+
+    raw = ipcPrepareHeader(&c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 1;
+    raw->offset = off;
+    raw->write_size = len;
+
+    Result rc = serviceIpcDispatch(&s->s);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        ipcParse(&r);
+
+        struct {
+            u64 magic;
+            u64 result;
+        } *resp = r.Raw;
+
+        rc = resp->result;
+    }
+
+    return rc;
+}
+
+Result fsStorageFlush(FsStorage* s) {
+    IpcCommand c;
+    ipcInitialize(&c);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+    } *raw;
+
+    raw = ipcPrepareHeader(&c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 2;
+
+    Result rc = serviceIpcDispatch(&s->s);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        ipcParse(&r);
+
+        struct {
+            u64 magic;
+            u64 result;
+        } *resp = r.Raw;
+
+        rc = resp->result;
+    }
+
+    return rc;
+}
+
+Result fsStorageSetSize(FsStorage* s, u64 sz) {
+    IpcCommand c;
+    ipcInitialize(&c);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+        u64 size;
+    } *raw;
+
+    raw = ipcPrepareHeader(&c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 3;
+    raw->size = sz;
+
+    Result rc = serviceIpcDispatch(&s->s);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        ipcParse(&r);
+
+        struct {
+            u64 magic;
+            u64 result;
+        } *resp = r.Raw;
+
+        rc = resp->result;
+    }
+
+    return rc;
+}
+
 Result fsStorageGetSize(FsStorage* s, u64* out) {
     IpcCommand c;
     ipcInitialize(&c);