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[PATCH 2/4] linux-user: Add support for a group of btrfs ioctls used for
From: |
Filip Bozuta |
Subject: |
[PATCH 2/4] linux-user: Add support for a group of btrfs ioctls used for snapshots |
Date: |
Thu, 9 Jul 2020 17:52:01 +0200 |
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.Bozuta@syrmia.com>
---
linux-user/ioctls.h | 8 ++++++++
linux-user/syscall_defs.h | 4 ++++
2 files changed, 12 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 c11bcc6ba9..21d8909fd6 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -968,8 +968,12 @@ struct target_rtc_pll_info {
#define TARGET_FS_IOC32_SETVERSION TARGET_IOW('v', 2, int)
/* btrfs ioctls */
+#define TARGET_BTRFS_IOC_SNAP_CREATE TARGET_IOW(BTRFS_IOCTL_MAGIC, \
+ 1, struct btrfs_ioctl_vol_args)
#define TARGET_BTRFS_IOC_SUBVOL_CREATE TARGET_IOW(BTRFS_IOCTL_MAGIC, \
14, struct btrfs_ioctl_vol_args)
+#define TARGET_BTRFS_IOC_SNAP_DESTROY TARGET_IOW(BTRFS_IOCTL_MAGIC, \
+ 15, struct btrfs_ioctl_vol_args)
#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, \
--
2.25.1