[PATCH v6 03/16] fs: add generic FS_IOC_SHUTDOWN definitions

[Namjae Jeon <linkinjeon@kernel.org>]

Currently, several filesystems (e.g., xfs, ext4, btrfs) implement
a "shutdown" or "going down" ioctl to simulate filesystem force a shutdown.
While they often use the same underlying numeric value, the definition is
duplicated across filesystem headers or private definitions.

This patch adds generic definitions for FS_IOC_SHUTDOWN in uapi/linux/fs.h.
This allows new filesystems (like ntfs) to implement this feature using
a standard VFS definition and paves the way for existing filesystems
to unify their definitions later.

The flag names are standardized as FS_SHUTDOWN_* to be consistent with
the ioctl name, replacing the historical GOING_DOWN naming convention.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 include/uapi/linux/fs.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 66ca526cf786..32e24778c9e5 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -656,4 +656,16 @@ struct procmap_query {
 	__u64 build_id_addr;		/* in */
 };
 
+/*
+ * Shutdown the filesystem.
+ */
+#define FS_IOC_SHUTDOWN _IOR('X', 125, __u32)
+
+/*
+ * Flags for FS_IOC_SHUTDOWN
+ */
+#define FS_SHUTDOWN_FLAGS_DEFAULT	0x0
+#define FS_SHUTDOWN_FLAGS_LOGFLUSH	0x1	/* flush log but not data*/
+#define FS_SHUTDOWN_FLAGS_NOLOGFLUSH	0x2	/* don't flush log nor data */
+
 #endif /* _UAPI_LINUX_FS_H */
-- 
2.25.1