From 78d3a673aa9bd241f1acf5fa1b9e6024d048d389 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Wed, 1 Apr 2015 00:25:34 +0200
Subject: [PATCH] Add statvfs support to extfs.

---
 ext/fsmarshall.cpp | 29 +++++++++++++++++++++++++++++
 ext/fuse.cpp       | 19 +++++++++++++++++--
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/ext/fsmarshall.cpp b/ext/fsmarshall.cpp
index a1d3396a..5a863b29 100644
--- a/ext/fsmarshall.cpp
+++ b/ext/fsmarshall.cpp
@@ -95,6 +95,13 @@ bool RespondStat(int chl, struct stat* st)
 	return RespondMessage(chl, FSM_RESP_STAT, &body, sizeof(body));
 }
 
+bool RespondStatVFS(int chl, struct statvfs* stvfs)
+{
+	struct fsm_resp_statvfs body;
+	body.stvfs = *stvfs;
+	return RespondMessage(chl, FSM_RESP_STATVFS, &body, sizeof(body));
+}
+
 bool RespondSeek(int chl, off_t offset)
 {
 	struct fsm_resp_lseek body;
@@ -585,6 +592,27 @@ void HandleRename(int chl, struct fsm_req_rename* msg, Filesystem* fs)
 	free(path);
 }
 
+void HandleStatVFS(int chl, struct fsm_req_statvfs* msg, Filesystem* fs)
+{
+	(void) msg;
+	struct statvfs stvfs;
+	stvfs.f_bsize = fs->block_size;
+	stvfs.f_frsize = fs->block_size;
+	stvfs.f_blocks = fs->num_blocks;
+	stvfs.f_bfree = fs->sb->s_free_blocks_count;
+	stvfs.f_bavail = fs->sb->s_free_blocks_count;
+	stvfs.f_files = fs->num_inodes;
+	stvfs.f_ffree = fs->sb->s_free_inodes_count;
+	stvfs.f_favail = fs->sb->s_free_inodes_count;
+	stvfs.f_ffree = fs->sb->s_free_inodes_count;
+	stvfs.f_fsid = 0;
+	stvfs.f_flag = 0;
+	if ( !fs->device->write )
+		stvfs.f_flag |= ST_RDONLY;
+	stvfs.f_namemax = 255;
+	RespondStatVFS(chl, &stvfs);
+}
+
 void HandleTCGetBlob(int chl, struct fsm_req_tcgetblob* msg, Filesystem* fs)
 {
 	if ( fs->num_inodes <= msg->ino )
@@ -639,6 +667,7 @@ void HandleIncomingMessage(int chl, struct fsm_msg_header* hdr, Filesystem* fs)
 	handlers[FSM_REQ_RENAME] = (handler_t) HandleRename;
 	handlers[FSM_REQ_REFER] = (handler_t) HandleRefer;
 	handlers[FSM_REQ_UNREF] = (handler_t) HandleUnref;
+	handlers[FSM_REQ_STATVFS] = (handler_t) HandleStatVFS;
 	handlers[FSM_REQ_TCGETBLOB] = (handler_t) HandleTCGetBlob;
 	if ( FSM_MSG_NUM <= hdr->msgtype || !handlers[hdr->msgtype] )
 	{
diff --git a/ext/fuse.cpp b/ext/fuse.cpp
index e11b9c11..e4c990b3 100644
--- a/ext/fuse.cpp
+++ b/ext/fuse.cpp
@@ -383,8 +383,23 @@ int ext2_fuse_write(const char* /*path*/, const char* buf, size_t count,
 
 int ext2_fuse_statfs(const char* /*path*/, struct statvfs* stvfs)
 {
-	(void) stvfs;
-	return errno = -ENOSYS, -1;
+	memset(stvfs, 0, sizeof(*stvfs));
+	Filesystem* fs = FUSE_FS;
+	stvfs->f_bsize = fs->block_size;
+	stvfs->f_frsize = fs->block_size;
+	stvfs->f_blocks = fs->num_blocks;
+	stvfs->f_bfree = fs->sb->s_free_blocks_count;
+	stvfs->f_bavail = fs->sb->s_free_blocks_count;
+	stvfs->f_files = fs->num_inodes;
+	stvfs->f_ffree = fs->sb->s_free_inodes_count;
+	stvfs->f_favail = fs->sb->s_free_inodes_count;
+	stvfs->f_ffree = fs->sb->s_free_inodes_count;
+	stvfs->f_fsid = 0;
+	stvfs->f_flag = 0;
+	if ( !fs->device->write )
+		stvfs->f_flag |= ST_RDONLY;
+	stvfs->f_namemax = 255;
+	return 0;
 }
 
 int ext2_fuse_flush(const char* /*path*/, struct fuse_file_info* fi)