linux-ext4 - [PATCH 08/10] fuse2fs: enable syncfs

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Message-ID: <175279461864.716436.8625571064879927613.stgit@frogsfrogsfrogs>
Date: Thu, 17 Jul 2025 16:47:28 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: joannelkoong@...il.com, miklos@...redi.hu, John@...ves.net,
 linux-fsdevel@...r.kernel.org, bernd@...ernd.com, linux-ext4@...r.kernel.org,
 neal@...pa.dev
Subject: [PATCH 08/10] fuse2fs: enable syncfs

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

Enable syncfs calls in fuse2fs.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 misc/fuse2fs.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)


diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 15595fdf0b19ba..66baca72ad49d1 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -5099,6 +5099,42 @@ static int op_fallocate(const char *path EXT2FS_ATTR((unused)), int mode,
 # endif /* SUPPORT_FALLOCATE */
 #endif /* FUSE 29 */
 
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 18)
+static int op_syncfs(const char *path)
+{
+	struct fuse_context *ctxt = fuse_get_context();
+	struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
+	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
 static void fuse2fs_iomap_hole(struct fuse2fs *ff, struct fuse_iomap *iomap,
 			       off_t pos, uint64_t count)
@@ -6301,6 +6337,9 @@ static struct fuse_operations fs_ops = {
 	.fallocate = op_fallocate,
 # endif
 #endif
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 18)
+	.syncfs = op_syncfs,
+#endif
 #ifdef HAVE_FUSE_IOMAP
 	.iomap_begin = op_iomap_begin,
 	.iomap_end = op_iomap_end,