52f82acb7b
See containerd/btrfs PR 40 and moby/moby PR 44761. (Thanks to [@]neersighted.) The containerd/btrfs library now requires headers from kernel 4.12 or newer: - https://github.com/torvalds/linux/blob/master/include/uapi/linux/btrfs.h - https://github.com/torvalds/linux/blob/master/include/uapi/linux/btrfs_tree.h These files are licensed under the GPL-2.0 WITH Linux-syscall-note, so it should be compatible with the Apache License 2.0. https://spdx.org/licenses/Linux-syscall-note.html The dependency on the kernel headers only affects users building from source. Users on older kernels may opt to not compile this library (`BUILDTAGS=no_btfs`), or to provide headers from a newer kernel. Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/*
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Copyright The containerd Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0)
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#error "Headers from kernel >= 4.12 are required on compilation time (not on run time)"
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#endif
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#include <linux/btrfs.h>
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#include <linux/btrfs_tree.h>
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// unfortunately, we need to define "alignment safe" C structs to populate for
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// packed structs that aren't handled by cgo. Fields will be added here, as
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// needed.
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struct gosafe_btrfs_root_item {
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__u8 uuid[BTRFS_UUID_SIZE];
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__u8 parent_uuid[BTRFS_UUID_SIZE];
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__u8 received_uuid[BTRFS_UUID_SIZE];
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__le64 generation;
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__le64 otransid;
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__le64 flags;
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};
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void unpack_root_item(struct gosafe_btrfs_root_item* dst, struct btrfs_root_item* src);
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/* void unpack_root_ref(struct gosafe_btrfs_root_ref* dst, struct btrfs_root_ref* src); */
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