qemu/linux-user
Filip Bozuta 53906f689d linux-user: Add support for btrfs ioctls used to manage quota
This patch implements functionality for following ioctls:

BTRFS_IOC_QUOTA_CTL - Enabling/Disabling quota support

    Enable or disable quota support for a btrfs filesystem. Quota
    support is enabled or disabled using the ioctls third argument
    which represents a pointer to a following type:

    struct btrfs_ioctl_quota_ctl_args {
	__u64 cmd;
	__u64 status;
    };

    Before calling this ioctl, the 'cmd' field should be filled
    with one of the values 'BTRFS_QUOTA_CTL_ENABLE' (enabling quota)
    'BTRFS_QUOTA_CTL_DISABLE' (disabling quota).

BTRFS_IOC_QGROUP_CREATE - Creating/Removing a subvolume quota group

    Create or remove a subvolume quota group. The subvolume quota
    group is created or removed using the ioctl's third argument which
    represents a pointer to a following type:

    struct btrfs_ioctl_qgroup_create_args {
	__u64 create;
	__u64 qgroupid;
    };

    Before calling this ioctl, the 'create' field should be filled
    with the aproppriate value depending on if the user wants to
    create or remove a quota group (0 for removing, everything else
    for creating). Also, the 'qgroupid' field should be filled with
    the value for the quota group id that is to be created.

BTRFS_IOC_QGROUP_ASSIGN - Asigning or removing a quota group as child group

    Asign or remove a quota group as child quota group of another
    group in the btrfs filesystem. The asignment is done using the
    ioctl's third argument which represents a pointert to a following type:

    struct btrfs_ioctl_qgroup_assign_args {
	__u64 assign;
	__u64 src;
	__u64 dst;
    };

    Before calling this ioctl, the 'assign' field should be filled with
    the aproppriate value depending on if the user wants to asign or remove
    a quota group as a child quota group of another group (0 for removing,
    everythin else for asigning). Also, the 'src' and 'dst' fields should
    be filled with the aproppriate quota group id values depending on which
    quota group needs to asigned or removed as child quota group of another
    group ('src' gets asigned or removed as child group of 'dst').

BTRFS_IOC_QGROUP_LIMIT - Limiting the size of a quota group

    Limit the size of a quota group. The size of the quota group is limited
    with the ioctls third argument which represents a pointer to a following
    type:

    struct btrfs_ioctl_qgroup_limit_args {
	__u64	qgroupid;
	struct btrfs_qgroup_limit lim;
    };

    Before calling this ioctl, the 'qgroup' id field should be filled with
    aproppriate value of the quota group id for which the size is to be
    limited. The second field is of following type:

    struct btrfs_qgroup_limit {
	__u64	flags;
	__u64	max_rfer;
	__u64	max_excl;
	__u64	rsv_rfer;
	__u64	rsv_excl;
    };

    The 'max_rfer' field should be filled with the size to which the quota
    group should be limited. The 'flags' field can be used for passing
    additional options and can have values which can be found on:
    https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/btrfs.h#L67

BTRFS_IOC_QUOTA_RESCAN_STATUS - Checking status of running rescan operation

    Check status of a running rescan operation. The status is checked using
    the ioctl's third argument which represents a pointer to a following type:

    struct btrfs_ioctl_quota_rescan_args {
        __u64   flags;
        __u64   progress;
        __u64   reserved[6];
    };

    If there is a rescan operation running, 'flags' field is set to 1, and
    'progress' field is set to aproppriate value which represents the progress
    of the operation.

BTRFS_IOC_QUOTA_RESCAN - Starting a rescan operation

    Start ar rescan operation to Trash all quota groups and scan the metadata
    again with the current config. Before calling this ioctl,
    BTRFS_IOC_QUOTA_RESCAN_STATUS sould be run to check if there is already a
    rescan operation runing. After that ioctl call, the received
    'struct btrfs_ioctl_quota_rescan_args' should be than passed as this ioctls
    third argument.

BTRFS_IOC_QUOTA_RESCAN_WAIT - Waiting for a rescan operation to finish

    Wait until a rescan operation is finished (if there is a rescan operation
    running). The third ioctls argument is ignored.

Implementation notes:

    Almost all of the ioctls in this patch use structure types as third arguments.
    That is the reason why aproppriate thunk definitions were added in file
    'syscall_types.h'.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200823195014.116226-8-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2020-09-03 01:09:35 +02:00
..
aarch64 linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
alpha linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
arm linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
cris linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
generic linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
host linux-user: Add safe_syscall for riscv64 host 2018-12-26 06:40:02 +11:00
hppa linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
i386 linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
m68k linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
microblaze linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
mips linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
mips64 linux-user: Add strace support for printing arguments of syscalls used to lock and unlock memory 2020-08-27 12:29:50 +02:00
nios2 linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
openrisc linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
ppc linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
riscv linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
s390x linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
sh4 linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
sparc linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
sparc64 linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
tilegx linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
x86_64 linux-user: Add generic 'termbits.h' for some archs 2020-08-27 12:29:50 +02:00
xtensa linux-user: Add missing termbits types and values definitions 2020-08-27 12:29:50 +02:00
cpu_loop-common.h cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
elfload.c linux-user: detect mismatched ELF ABI in qemu-mips[n32][el] 2020-08-27 12:29:50 +02:00
errno_defs.h Supply missing header guards 2019-06-12 13:20:21 +02:00
exit.c build: move TARGET_GPROF to config-host.mak 2020-02-12 16:29:27 +01:00
fd-trans.c linux-user: add netlink RTM_SETLINK command 2020-07-13 21:26:33 +02:00
fd-trans.h linux-user: move TargetFdTrans functions to their own file 2018-09-25 22:36:47 +02:00
flat.h Supply missing header guards 2019-06-12 13:20:21 +02:00
flatload.c linux-user: completely re-write init_guest_space 2020-05-15 15:25:16 +01:00
ioctls.h linux-user: Add support for btrfs ioctls used to manage quota 2020-09-03 01:09:35 +02:00
linux_loop.h linux-user: Add loop control ioctls 2016-07-19 15:22:33 +03:00
linuxload.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
main.c linux-user: Ensure mmap_min_addr is non-zero 2020-07-27 22:02:40 +02:00
meson.build meson: linux-user 2020-08-21 06:30:38 -04:00
mmap.c linux-user: Adjust guest page protection for the host 2020-08-23 16:57:58 +02:00
qemu.h linux-user: Add strace support for printing arguments for ioctls used for terminals and serial lines 2020-08-27 12:29:50 +02:00
safe-syscall.S linux-user: Provide safe_syscall for fixing races between signals and syscalls 2016-05-27 14:49:51 +03:00
signal-common.h linux-user: Make sigaltstack stacks per-thread 2019-07-26 19:24:33 +02:00
signal.c linux-user: Use `qemu_log' for strace 2020-02-19 11:17:40 +01:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user: Add strace support for printing OFD fcntl operations 2020-09-01 11:47:12 +02:00
strace.list linux-user: Add strace support for printing arguments of some clock and time functions 2020-08-27 12:29:50 +02:00
syscall_defs.h linux-user: Add support for btrfs ioctls used to manage quota 2020-09-03 01:09:35 +02:00
syscall_types.h linux-user: Add support for btrfs ioctls used to manage quota 2020-09-03 01:09:35 +02:00
syscall.c linux-user: Add support for a group of btrfs ioctls used for subvolumes 2020-09-03 01:09:35 +02:00
target_flat.h Supply missing header guards 2019-06-12 13:20:21 +02:00
trace-events linux-user: fix use of SIGRTMIN 2020-02-12 18:56:41 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
uaccess.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
uname.c cpu: Replace ENV_GET_CPU with env_cpu 2019-06-10 07:03:34 -07:00
uname.h Clean up decorations and whitespace around header guards 2016-07-12 16:20:46 +02:00
vm86.c linux-user: Use `qemu_log' for non-strace logging 2020-02-19 11:17:40 +01:00