Le 03/08/2020 à 11:46, Filip Bozuta a écrit :
> This patch implements functionality for following ioctls:
>
> BTRFS_IOC_SNAP_CREATE - Creating a subvolume snapshot
>
> Create a snapshot of a btrfs subvolume. The snapshot is created using the
> ioctl's third argument that is a pointer to a 'struct
> btrfs_ioctl_vol_args'
> (which was mentioned in the previous patch). Before calling this ioctl,
> the fields of the structure should be filled with aproppriate values for
> the file descriptor and path of the subvolume for which the snapshot is to
> be created.
>
> BTRFS_IOC_SNAP_DESTROY - Removing a subvolume snapshot
>
> Delete a snapshot of a btrfs subvolume. The snapshot is deleted using the
> ioctl's third argument that is a pointer to a 'struct
> btrfs_ioctl_vol_args'
> (which was mentioned in the previous patch). Before calling this ioctl,
> the fields of the structure should be filled with aproppriate values for
> the file descriptor and path of the subvolume for which the snapshot is to
> be deleted.
>
> Implementation notes:
>
> Since the thunk type 'struct btrfs_ioctl_vol_args' is defined in the
> previous patch, the implementation for these ioctls was straightforward.
>
> Signed-off-by: Filip Bozuta <filip.boz...@syrmia.com>
> Reviewed-by: Laurent Vivier <laur...@vivier.eu>
> ---
> linux-user/ioctls.h | 8 ++++++++
> linux-user/syscall_defs.h | 2 ++
> 2 files changed, 10 insertions(+)
>
> diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
> index 544184ff95..2422675dd0 100644
> --- a/linux-user/ioctls.h
> +++ b/linux-user/ioctls.h
> @@ -174,10 +174,18 @@
> IOCTL(FS_IOC32_GETVERSION, IOC_R, MK_PTR(TYPE_INT))
> IOCTL(FS_IOC32_SETVERSION, IOC_W, MK_PTR(TYPE_INT))
>
> +#ifdef BTRFS_IOC_SNAP_CREATE
> + IOCTL(BTRFS_IOC_SNAP_CREATE, IOC_W,
> + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
> +#endif
> #ifdef BTRFS_IOC_SUBVOL_CREATE
> IOCTL(BTRFS_IOC_SUBVOL_CREATE, IOC_W,
> MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
> #endif
> +#ifdef BTRFS_IOC_SNAP_DESTROY
> + IOCTL(BTRFS_IOC_SNAP_DESTROY, IOC_W,
> + MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
> +#endif
> #ifdef BTRFS_IOC_SUBVOL_GETFLAGS
> IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG))
> #endif
> diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
> index 67a3c110b6..16966c323f 100644
> --- a/linux-user/syscall_defs.h
> +++ b/linux-user/syscall_defs.h
> @@ -968,7 +968,9 @@ struct target_rtc_pll_info {
> #define TARGET_FS_IOC32_SETVERSION TARGET_IOW('v', 2, int)
>
> /* btrfs ioctls */
> +#define TARGET_BTRFS_IOC_SNAP_CREATE
> TARGET_IOWU(BTRFS_IOCTL_MAGIC, 1)
> #define TARGET_BTRFS_IOC_SUBVOL_CREATE
> TARGET_IOWU(BTRFS_IOCTL_MAGIC, 14)
> +#define TARGET_BTRFS_IOC_SNAP_DESTROY
> TARGET_IOWU(BTRFS_IOCTL_MAGIC, 15)
> #define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS
> TARGET_IOR(BTRFS_IOCTL_MAGIC, 25,\
> abi_ullong)
> #define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS
> TARGET_IOW(BTRFS_IOCTL_MAGIC, 26,\
>
Applied to my linux-user-for-5.2 branch.
Thanks,
Laurent
