From 7b7a2d5d0019a542c25708359f3c238a56002e38 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@gmail.com>
Date: Wed, 12 Aug 2026 15:03:15 +0200
Subject: [PATCH] Fail sync if snapshot setup fails on a supported filesystem

---
 cmdline/mingwapp.c | 2 +-
 cmdline/state.c    | 7 ++++++-
 cmdline/unixapp.c  | 4 ++--
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/cmdline/mingwapp.c b/cmdline/mingwapp.c
index 43b1a6f6..9d029588 100644
--- a/cmdline/mingwapp.c
+++ b/cmdline/mingwapp.c
@@ -437,7 +437,7 @@ int fssnapshot_mount(const char* dir, struct fssnapshot_struct* fss)
 	if (wcscmp(fs_name, L"NTFS") == 0)
 		magic = WINDOWS_NTFS_MAGIC;
 	else
-		return -1;         /* support only NTFS */
+		return 1; /* support only NTFS */
 
 	/*
 	 * Obtain the canonical volume name: \\?\Volume{GUID}\
diff --git a/cmdline/state.c b/cmdline/state.c
index 84867764..fb7e536d 100644
--- a/cmdline/state.c
+++ b/cmdline/state.c
@@ -5965,8 +5965,13 @@ int state_snapshot_scan(struct snapraid_state* state)
 		struct snapraid_disk* disk = i->data;
 
 		/* check if it supports snapshot */
-		if (fssnapshot_mount(disk->mount_point, &disk->fss) != 0)
+		int res = fssnapshot_mount(disk->mount_point, &disk->fss);
+		if (res > 0)
 			continue;
+		if (res < 0) {
+			log_fatal(EINTERNAL, "Failed to setup snapshot for disk '%s'.\n", disk->name);
+			return -1;
+		}
 
 		size_t root_len = strlen(disk->fss.root_dir);
 
diff --git a/cmdline/unixapp.c b/cmdline/unixapp.c
index 875a89cc..870c7005 100644
--- a/cmdline/unixapp.c
+++ b/cmdline/unixapp.c
@@ -2177,12 +2177,12 @@ int fssnapshot_mount(const char* path, struct fssnapshot_struct* fss)
 	} else if (sfs.f_type == ZFS_SUPER_MAGIC) {
 		return fssnapshot_zfs(path, ZFS_SUPER_MAGIC, fss);
 	} else {
-		return -1;
+		return 1;
 	}
 #else
 	(void)path;
 	(void)fss;
-	return -1;
+	return 1;
 #endif
 }