[PATCH 7/8] fuse2fs: enable syncfs

Darrick J. Wong
2025-08-21T01:23:00Z

Enable syncfs calls in fuse2fs.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
misc/fuse2fs.c | 36 ++++++++++++++++++++++++++++++++++++
misc/fuse4fs.c | 39 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 80bd47549925bf..62aca0ab56ec07 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -5414,6 +5414,41 @@ 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, 99)
+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
static void fuse2fs_iomap_hole(struct fuse2fs *ff, struct fuse_file_iomap *iomap,
off_t pos, uint64_t count)
@@ -6750,6 +6785,7 @@ static struct fuse_operations fs_ops = {
#endif
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99)
.getattr_iflags = op_getattr_iflags,
+ .syncfs = op_syncfs,
#endif
#ifdef HAVE_FUSE_IOMAP
.iomap_begin = op_iomap_begin,
diff --git a/misc/fuse4fs.c b/misc/fuse4fs.c
index a06e963eab6afd..e01b83e271415c 100644
--- a/misc/fuse4fs.c
+++ b/misc/fuse4fs.c
@@ -1968,7 +1968,7 @@ static int fuse4fs_statx(struct fuse4fs *ff, ext2_ino_t ino, int statx_mask,
static void op_statx(fuse_req_t req, fuse_ino_t fino, int flags, int mask,
struct fuse_file_info *fi)
{
- struct statx stx;
+ struct statx stx = { };
struct fuse4fs *ff = fuse4fs_get(req);
ext2_ino_t ino;
int ret = 0;
@@ -5708,6 +5708,40 @@ static void op_fallocate(fuse_req_t req, fuse_ino_t fino EXT2FS_ATTR((unused)),
}
#endif /* SUPPORT_FALLOCATE */

+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99)
+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
+
#ifdef HAVE_FUSE_IOMAP
static void fuse4fs_iomap_hole(struct fuse4fs *ff, struct fuse_file_iomap *iomap,
off_t pos, uint64_t count)
@@ -7034,6 +7068,9 @@ static struct fuse_lowlevel_ops fs_ops = {
#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 18)
.statx = op_statx,
#endif
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 99)
+ .syncfs = op_syncfs,
+#endif
#ifdef HAVE_FUSE_IOMAP
.iomap_begin = op_iomap_begin,
.iomap_end = op_iomap_end,