Commit 1f662195 authored by Namjae Jeon's avatar Namjae Jeon
Browse files

fs: add generic FS_IOC_SHUTDOWN definitions 



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.

Add 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.

Reviewed-by: default avatar"Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
parent 1e9ea7e0

include/uapi/linux/fs.h

+12 −0
Original line number Diff line number Diff line
@@ -657,4 +657,16 @@ 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 */