linux-ext4 - [PATCH 08/11] fuse2fs: enable syncfs

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Message-ID: <176169818368.1430380.11990499926700329921.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 18:15:28 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: linux-fsdevel@...r.kernel.org, joannelkoong@...il.com, bernd@...ernd.com,
 neal@...pa.dev, miklos@...redi.hu, linux-ext4@...r.kernel.org
Subject: [PATCH 08/11] fuse2fs: enable syncfs

From: Darrick J. Wong <djwong@...nel.org>

Enable syncfs calls in fuse2fs.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 fuse4fs/fuse4fs.c |   32 ++++++++++++++++++++++++++++++++
 misc/fuse2fs.c    |   34 ++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)


diff --git a/fuse4fs/fuse4fs.c b/fuse4fs/fuse4fs.c
index cafee29991bff6..ac8696aab65af4 100644
--- a/fuse4fs/fuse4fs.c
+++ b/fuse4fs/fuse4fs.c
@@ -6271,7 +6271,38 @@ static void op_shutdownfs(fuse_req_t req, fuse_ino_t ino, uint64_t flags)
 	int ret;
 
 	ret = ioctl_shutdown(ff, ctxt, NULL, NULL, 0);
+	fuse_reply_err(req, -ret);
+}
 
+static void op_syncfs(fuse_req_t req, fuse_ino_t ino)
+{
+	struct fuse4fs *ff = fuse4fs_get(req);
+	ext2_filsys fs;
+	errcode_t err;
+	int ret = 0;
+
+	FUSE4FS_CHECK_CONTEXT(req);
+	fs = fuse4fs_start(ff);
+
+	if (ff->opstate == F4OP_WRITABLE) {
+		if (fs->super->s_error_count)
+			fs->super->s_state |= EXT2_ERROR_FS;
+		ext2fs_mark_super_dirty(fs);
+		err = ext2fs_set_gdt_csum(fs);
+		if (err) {
+			ret = translate_error(fs, 0, err);
+			goto out_unlock;
+		}
+
+		err = ext2fs_flush2(fs, 0);
+		if (err) {
+			ret = translate_error(fs, 0, err);
+			goto out_unlock;
+		}
+	}
+
+out_unlock:
+	fuse4fs_finish(ff, ret);
 	fuse_reply_err(req, -ret);
 }
 #endif
@@ -7568,6 +7599,7 @@ static struct fuse_lowlevel_ops fs_ops = {
 	.freezefs = op_freezefs,
 	.unfreezefs = op_unfreezefs,
 	.shutdownfs = op_shutdownfs,
+	.syncfs = op_syncfs,
 #endif
 #ifdef HAVE_FUSE_IOMAP
 	.iomap_begin = op_iomap_begin,
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 10673aaed60dea..b6ede4bcb32c27 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -5829,6 +5829,39 @@ static int op_shutdownfs(const char *path, uint64_t flags)
 
 	return ioctl_shutdown(ff, NULL, NULL);
 }
+
+static int op_syncfs(const char *path)
+{
+	struct fuse2fs *ff = fuse2fs_get();
+	ext2_filsys fs;
+	errcode_t err;
+	int ret = 0;
+
+	FUSE2FS_CHECK_CONTEXT(ff);
+	dbg_printf(ff, "%s: path=%s\n", __func__, path);
+	fs = fuse2fs_start(ff);
+
+	if (ff->opstate == F2OP_WRITABLE) {
+		if (fs->super->s_error_count)
+			fs->super->s_state |= EXT2_ERROR_FS;
+		ext2fs_mark_super_dirty(fs);
+		err = ext2fs_set_gdt_csum(fs);
+		if (err) {
+			ret = translate_error(fs, 0, err);
+			goto out_unlock;
+		}
+
+		err = ext2fs_flush2(fs, 0);
+		if (err) {
+			ret = translate_error(fs, 0, err);
+			goto out_unlock;
+		}
+	}
+
+out_unlock:
+	fuse2fs_finish(ff, ret);
+	return ret;
+}
 #endif
 
 #ifdef HAVE_FUSE_IOMAP
@@ -7114,6 +7147,7 @@ static struct fuse_operations fs_ops = {
 	.freezefs = op_freezefs,
 	.unfreezefs = op_unfreezefs,
 	.shutdownfs = op_shutdownfs,
+	.syncfs = op_syncfs,
 #endif
 #ifdef HAVE_FUSE_IOMAP
 	.iomap_begin = op_iomap_begin,