linux-kernel - Re: [PATCH] btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION} in btrfs

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Date:	Thu, 29 Oct 2015 20:36:35 +0100
From:	Thomas Rohwer <trohwer85@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-btrfs@...r.kernel.org
Subject: Re: [PATCH] btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION}
 in btrfs_ioctl

> I suggest to add an anonymous union and add a u64 member that would
> force the type width:
>
> struct btrfs_ioctl_send_args {
>          __s64 send_fd;                  /* in */
>          __u64 clone_sources_count;      /* in */
> 	union {
> 		__u64 __user *clone_sources;    /* in */
> 		u64 __pointer_alignment;
> 	};
>          __u64 parent_root;              /* in */
>          __u64 flags;                    /* in */
>          __u64 reserved[4];              /* in */
> };

I am no expert, but would this change alone modify the user space ABI of a 32-bit Linux kernel?
I.e. people in the (presumably currently working) btrfs-send situation (32-bit) user space/32-bit kernel
would have to upgrade user space tools and kernel at the same time. Otherwise, they will encounter a non-working setup.
I think, my suggested patch does not change any working ABI, and no change to the user
space tools are necessary.

Sincerely,

Thomas Rohwer

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