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120 lines
2.8 KiB
Go
120 lines
2.8 KiB
Go
//go:build !windows
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// +build !windows
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/*
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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 fs
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import (
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"context"
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"os"
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"path/filepath"
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"syscall"
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)
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// blocksUnitSize is the unit used by `st_blocks` in `stat` in bytes.
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// See https://man7.org/linux/man-pages/man2/stat.2.html
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//
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// st_blocks
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// This field indicates the number of blocks allocated to the
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// file, in 512-byte units. (This may be smaller than
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// st_size/512 when the file has holes.)
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const blocksUnitSize = 512
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type inode struct {
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// TODO(stevvooe): Can probably reduce memory usage by not tracking
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// device, but we can leave this right for now.
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dev, ino uint64
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}
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func newInode(stat *syscall.Stat_t) inode {
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return inode{
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dev: uint64(stat.Dev), //nolint: unconvert // dev is uint32 on darwin/bsd, uint64 on linux/solaris/freebsd
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ino: uint64(stat.Ino), //nolint: unconvert // ino is uint32 on bsd, uint64 on darwin/linux/solaris/freebsd
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}
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}
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func diskUsage(ctx context.Context, roots ...string) (Usage, error) {
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var (
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size int64
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inodes = map[inode]struct{}{} // expensive!
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)
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for _, root := range roots {
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if err := filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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stat := fi.Sys().(*syscall.Stat_t)
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inoKey := newInode(stat)
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if _, ok := inodes[inoKey]; !ok {
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inodes[inoKey] = struct{}{}
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size += stat.Blocks * blocksUnitSize
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}
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return nil
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}); err != nil {
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return Usage{}, err
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}
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}
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return Usage{
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Inodes: int64(len(inodes)),
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Size: size,
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}, nil
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}
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func diffUsage(ctx context.Context, a, b string) (Usage, error) {
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var (
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size int64
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inodes = map[inode]struct{}{} // expensive!
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)
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if err := Changes(ctx, a, b, func(kind ChangeKind, _ string, fi os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if kind == ChangeKindAdd || kind == ChangeKindModify {
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stat := fi.Sys().(*syscall.Stat_t)
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inoKey := newInode(stat)
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if _, ok := inodes[inoKey]; !ok {
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inodes[inoKey] = struct{}{}
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size += stat.Blocks * blocksUnitSize
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}
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return nil
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}
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return nil
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}); err != nil {
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return Usage{}, err
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}
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return Usage{
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Inodes: int64(len(inodes)),
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Size: size,
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}, nil
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}
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