95 lines
3.9 KiB
Diff
95 lines
3.9 KiB
Diff
From: Filip Bozuta <Filip.Bozuta@syrmia.com>
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Date: Thu, 3 Sep 2020 01:26:55 +0200
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Subject: [PATCH] linux-user: Add support for a group of btrfs ioctls used for
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snapshots
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This patch implements functionality for following ioctls:
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BTRFS_IOC_SNAP_CREATE - Creating a subvolume snapshot
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Create a snapshot of a btrfs subvolume. The snapshot is created using the
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ioctl's third argument that is a pointer to a 'struct btrfs_ioctl_vol_args'
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(which was mentioned in the previous patch). Before calling this ioctl,
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the fields of the structure should be filled with aproppriate values for
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the file descriptor and path of the subvolume for which the snapshot is to
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be created.
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BTRFS_IOC_SNAP_DESTROY - Removing a subvolume snapshot
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Delete a snapshot of a btrfs subvolume. The snapshot is deleted using the
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ioctl's third argument that is a pointer to a 'struct btrfs_ioctl_vol_args'
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(which was mentioned in the previous patch). Before calling this ioctl,
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the fields of the structure should be filled with aproppriate values for
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the file descriptor and path of the subvolume for which the snapshot is to
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be deleted.
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Implementation notes:
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Since the thunk type 'struct btrfs_ioctl_vol_args' is defined in the
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previous patch, the implementation for these ioctls was straightforward.
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Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
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Tested-by: Daniel P. Berrangé <berrange@redhat.com>
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Message-Id: <20200823195014.116226-3-Filip.Bozuta@syrmia.com>
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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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---
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linux-user/ioctls.h | 8 ++++++++
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linux-user/syscall_defs.h | 2 ++
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linux-user/syscall_types.h | 3 ++-
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3 files changed, 12 insertions(+), 1 deletion(-)
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diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
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index 12d1444224..f33a99f8b6 100644
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--- a/linux-user/ioctls.h
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+++ b/linux-user/ioctls.h
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@@ -174,10 +174,18 @@
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IOCTL(FS_IOC32_GETVERSION, IOC_R, MK_PTR(TYPE_INT))
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IOCTL(FS_IOC32_SETVERSION, IOC_W, MK_PTR(TYPE_INT))
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+#ifdef BTRFS_IOC_SNAP_CREATE
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+ IOCTL(BTRFS_IOC_SNAP_CREATE, IOC_W,
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+ MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
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+#endif
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#ifdef BTRFS_IOC_SUBVOL_CREATE
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IOCTL(BTRFS_IOC_SUBVOL_CREATE, IOC_W,
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MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
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#endif
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+#ifdef BTRFS_IOC_SNAP_DESTROY
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+ IOCTL(BTRFS_IOC_SNAP_DESTROY, IOC_W,
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+ MK_PTR(MK_STRUCT(STRUCT_btrfs_ioctl_vol_args)))
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+#endif
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#ifdef BTRFS_IOC_SUBVOL_GETFLAGS
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IOCTL(BTRFS_IOC_SUBVOL_GETFLAGS, IOC_R, MK_PTR(TYPE_ULONGLONG))
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#endif
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diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
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index 2757956dfa..a945e12547 100644
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--- a/linux-user/syscall_defs.h
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+++ b/linux-user/syscall_defs.h
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@@ -968,7 +968,9 @@ struct target_rtc_pll_info {
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#define TARGET_FS_IOC32_SETVERSION TARGET_IOW('v', 2, int)
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/* btrfs ioctls */
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+#define TARGET_BTRFS_IOC_SNAP_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC, 1)
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#define TARGET_BTRFS_IOC_SUBVOL_CREATE TARGET_IOWU(BTRFS_IOCTL_MAGIC, 14)
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+#define TARGET_BTRFS_IOC_SNAP_DESTROY TARGET_IOWU(BTRFS_IOCTL_MAGIC, 15)
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#define TARGET_BTRFS_IOC_SUBVOL_GETFLAGS TARGET_IOR(BTRFS_IOCTL_MAGIC, 25,\
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abi_ullong)
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#define TARGET_BTRFS_IOC_SUBVOL_SETFLAGS TARGET_IOW(BTRFS_IOCTL_MAGIC, 26,\
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diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
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index db61dbc1b3..038cd7869b 100644
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--- a/linux-user/syscall_types.h
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+++ b/linux-user/syscall_types.h
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@@ -354,7 +354,8 @@ STRUCT(blkpg_partition,
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MK_ARRAY(TYPE_CHAR, BLKPG_DEVNAMELTH), /* devname */
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MK_ARRAY(TYPE_CHAR, BLKPG_VOLNAMELTH)) /* volname */
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-#ifdef BTRFS_IOC_SUBVOL_CREATE
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+#if defined(BTRFS_IOC_SUBVOL_CREATE) || defined(BTRFS_IOC_SNAP_CREATE) || \
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+ defined(BTRFS_IOC_SNAP_DESTROY)
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STRUCT(btrfs_ioctl_vol_args,
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TYPE_LONGLONG, /* fd */
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MK_ARRAY(TYPE_CHAR, BTRFS_PATH_NAME_MAX + 1)) /* name */
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