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fs: add generic FS_IOC_SHUTDOWN definitions

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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: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-01-30 14:59:19 +09:00
parent 1e9ea7e044
commit 1f662195db
1 changed files with 12 additions and 0 deletions
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12
include/uapi/linux/fs.h
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@ -657,4 +657,16 @@ struct procmap_query {
__u64 build_id_addr; /* in */ __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 */ #endif /* _UAPI_LINUX_FS_H */