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>
46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
/*
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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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package btrfs
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// Info describes metadata about a btrfs subvolume.
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type Info struct {
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ID uint64 // subvolume id
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ParentID uint64 // aka ref_tree
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TopLevelID uint64 // not actually clear what this is, not set for now.
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Offset uint64 // key offset for root
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DirID uint64
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Generation uint64
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OriginalGeneration uint64
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UUID string
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ParentUUID string
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ReceivedUUID string
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Name string
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Path string // absolute path of subvolume
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Root string // path of root mount point
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Readonly bool // true if the snaps hot is readonly, extracted from flags
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}
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type infosByID []Info
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func (b infosByID) Len() int { return len(b) }
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func (b infosByID) Less(i, j int) bool { return b[i].ID < b[j].ID }
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func (b infosByID) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
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