Re: [PATCH v3 0/8] linux-user: Adding support for a group of btrfs ioctls

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sun, Aug 23, 2020 at 09:50:06PM +0200, Filip Bozuta wrote:
> This series covers support for following btrfs ioctls
> 
>     *BTRFS_SUBVOL_CREATE           *BTRFS_IOC_ADD_DEV
>     *BTRFS_SUBVOL_SETFLAGS         *BTRFS_IOC_RM_DEV
>     *BTRFS_SUBVOL_GETFLAGS         *BTRFS_IOC_DEV_INFO
>     *BTRFS_GET_SUBVOL_INFO         *BTRFS_IOC_GET_DEV_STATS
>     *BTRFS_IOC_SNAP_CREATE         *BTRFS_IOC_GET_FEATURES
>     *BTRFS_IOC_SNAP_DESTROY        *BTRFS_IOC_SET_FEATURES
>     *BTRFS_IOC_SCAN_DEV            *BTRFS_IOC_GET_SUPPORTED_FEATURES
>     *BTRFS_IOC_DEFAULT_SUBVOL      *BTRFS_IOC_QUOTA_RESCAN
>     *BTRFS_IOC_GET_SUBVOL_ROOTREF  *BTRFS_IOC_QUOTA_RESCAN_WAIT
>     *BTRFS_IOC_QUOTA_CTL           *BTRFS_IOC_SCRUB
>     *BTRFS_IOC_QGROUP_CREATE       *BTRFS_IOC_SCRUB_CANCEL
>     *BTRFS_IOC_QGROUP_ASSIGN       *BTRFS_IOC_SCRUB_PROGRESS
>     *BTRFS_IOC_INO_PATHS           *BTRFS_IOC_QGROUP_LIMIT
>     *BTRFS_IOC_LOGICAL_INO         *BTRFS_IOC_QUOTA_RESCAN_STATUS
>     *BTRFS_IOC_LOGICAL_INO_V2
>     *BTRFS_IOC_INO_LOOKUP_USER
>     *BTRFS_IOC_INO_LOOKUP
> 
> The functionalities of individual ioctls were described in this series
> patch commit messages. Since all of these ioctls are added in kernel
> version 3.9, their definitions in file 'linux-user/ioctls.h' are
> enwrapped in an #ifdef directive.
> 
> Testing method:
> 
>     Mini test programs were written for these ioctls. These test programs
>     can be found on a repositort which is located on the link:
>     https://github.com/bozutaf/btrfs-tests
> 
>     These test programs were compiled (sometimes using cross compilers) for
>     following architectures:
> 
>          * Intel 64-bit (little endian)
>          * Power pc 32-bit (big endian)
>          * Power pc 64-bit (big endian)
> 
>     The corresponding native programs were executed without using QEMU on
>     an intel x86_64 host.
> 
>     All applicable compiled programs were in turn executed through QEMU
>     and the results obtained were the same ones gotten for native
>     execution.
> 
> v2:
> 
>     * Merged two series in one 8 patch series
>     * Changed target ioctl definitions from IOR/IOW/IOWR to IORU/IOWU/IOWRU
>     * Fixed some thunk struct definitions
> 
> v3:
> 
>    * Added some checks in fine 'syscall_types.h' to see whether the ioctls that
>      use the defined thunk types are present. This is done to support systems
>      that have older versions of 'btrfs.h' file or if the file is not present
>      at all. This is neccesary as to not cause build errors as some structures
>      depend on values which are defined in 'btrfs.h'.
> 
> Filip Bozuta (8):
>   linux-user: Add support for a group of btrfs ioctls used for
>     subvolumes
>   linux-user: Add support for a group of btrfs ioctls used for snapshots
>   linux-user: Add support for btrfs ioctls used to manipulate with
>     devices
>   linux-user: Add support for btrfs ioctls used to get/set features
>   linux-user: Add support for a group of btrfs inode ioctls
>   linux-user: Add support for two btrfs ioctls used for subvolume
>   linux-user: Add support for btrfs ioctls used to manage quota
>   linux-user: Add support for btrfs ioctls used to scrub a filesystem
> 
>  configure                  |   9 ++
>  linux-user/ioctls.h        | 124 ++++++++++++++++++++++++++++
>  linux-user/syscall.c       |   3 +
>  linux-user/syscall_defs.h  |  37 +++++++++
>  linux-user/syscall_types.h | 163 +++++++++++++++++++++++++++++++++++++
>  5 files changed, 336 insertions(+)

Tested-by: Daniel P. Berrangé <berrange@redhat.com>

This series solves a problem that Fedora has with creating btrfs volumes
inside a mock chroot using qemu-user.

Regards,
Daniel
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