linux-kernel - Re: [PATCH v6 03/16] fs: add generic FS_IOC

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Message-ID: <lr73r5xefcyv3je5ietj5wsqgdi5xwlut7u6nmxbnaxvtanmi4@zhgycwippa6o>
Date: Tue, 3 Feb 2026 09:54:44 +0100
From: Jan Kara <jack@...e.cz>
To: Namjae Jeon <linkinjeon@...nel.org>
Cc: viro@...iv.linux.org.uk, brauner@...nel.org, hch@....de, tytso@....edu, 
	willy@...radead.org, jack@...e.cz, djwong@...nel.org, josef@...icpanda.com, 
	sandeen@...deen.net, rgoldwyn@...e.com, xiang@...nel.org, dsterba@...e.com, 
	pali@...nel.org, ebiggers@...nel.org, neil@...wn.name, amir73il@...il.com, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, iamjoonsoo.kim@....com, 
	cheol.lee@....com, jay.sim@....com, gunho.lee@....com
Subject: Re: [PATCH v6 03/16] fs: add generic FS_IOC_SHUTDOWN definitions

On Tue 03-02-26 07:01:49, Namjae Jeon wrote:
> 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@...nel.org>

Good idea. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  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
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR