linux-ext4 - [PATCH 4/4] libfuse: add syncfs support to the upper library

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Message-ID: <176169814390.1428390.9380093122042614031.stgit@frogsfrogsfrogs>
Date: Tue, 28 Oct 2025 18:06:20 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: djwong@...nel.org, bschubert@....com
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 bernd@...ernd.com, miklos@...redi.hu, joannelkoong@...il.com, neal@...pa.dev
Subject: [PATCH 4/4] libfuse: add syncfs support to the upper library

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

Support syncfs in the upper level library.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 include/fuse.h |    5 +++++
 lib/fuse.c     |   31 +++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)


diff --git a/include/fuse.h b/include/fuse.h
index a10666b78eb1eb..3d36b49e1b3f67 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -918,6 +918,11 @@ struct fuse_operations {
 	 * Shut down the filesystem
 	 */
 	int (*shutdownfs) (const char *path, uint64_t flags);
+
+	/*
+	 * Flush the entire filesystem to disk.
+	 */
+	int (*syncfs) (const char *path);
 };
 
 /** Extra context that may be needed by some filesystems
diff --git a/lib/fuse.c b/lib/fuse.c
index b8d4b4600077d7..d54fc9ea2004bd 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -3000,6 +3000,16 @@ static int fuse_fs_shutdownfs(struct fuse_fs *fs, const char *path,
 	return fs->op.shutdownfs(path, flags);
 }
 
+static int fuse_fs_syncfs(struct fuse_fs *fs, const char *path)
+{
+	fuse_get_context()->private_data = fs->user_data;
+	if (!fs->op.syncfs)
+		return -ENOSYS;
+	if (fs->debug)
+		fuse_log(FUSE_LOG_DEBUG, "syncfs[%s]\n", path);
+	return fs->op.syncfs(path);
+}
+
 static void fuse_lib_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
 			     int valid, struct fuse_file_info *fi)
 {
@@ -4933,6 +4943,26 @@ static void fuse_lib_shutdownfs(fuse_req_t req, fuse_ino_t ino, uint64_t flags)
 	reply_err(req, err);
 }
 
+static void fuse_lib_syncfs(fuse_req_t req, fuse_ino_t ino)
+{
+	struct fuse *f = req_fuse_prepare(req);
+	struct fuse_intr_data d;
+	char *path;
+	int err;
+
+	err = get_path(f, ino, &path);
+	if (err) {
+		reply_err(req, err);
+		return;
+	}
+
+	fuse_prepare_interrupt(f, req, &d);
+	err = fuse_fs_syncfs(f->fs, path);
+	fuse_finish_interrupt(f, req, &d);
+	free_path(f, ino, path);
+	reply_err(req, err);
+}
+
 static int clean_delay(struct fuse *f)
 {
 	/*
@@ -5034,6 +5064,7 @@ static struct fuse_lowlevel_ops fuse_path_ops = {
 #ifdef HAVE_STATX
 	.statx = fuse_lib_statx,
 #endif
+	.syncfs = fuse_lib_syncfs,
 	.freezefs = fuse_lib_freezefs,
 	.unfreezefs = fuse_lib_unfreezefs,
 	.shutdownfs = fuse_lib_shutdownfs,