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45 lines
1.5 KiB
Go
45 lines
1.5 KiB
Go
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// Copyright 2020 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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//go:build linux
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// +build linux
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package vfs
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import "golang.org/x/sys/unix"
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func (defaultFS) GetDiskUsage(path string) (DiskUsage, error) {
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stat := unix.Statfs_t{}
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if err := unix.Statfs(path, &stat); err != nil {
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return DiskUsage{}, err
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}
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// We use stat.Frsize here rather than stat.Bsize because on
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// Linux Bavail and Bfree are in Frsize units.
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//
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// On most filesystems Frsize and Bsize will be set to the
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// same value, but on some filesystems bsize returns the
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// "optimal transfer block size"[1] which may be different
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// (typically larger) than the actual block size.
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//
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// This confusion is cleared up in the statvfs[2] libc function,
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// but the statfs system call used above varies across
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// platforms.
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//
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// Frsize is used by GNU coreutils and other libraries, so
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// this also helps ensure that we get the same results as one
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// would get if they ran `df` on the given path.
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//
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// [1] https://man7.org/linux/man-pages/man2/statfs.2.html
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// [2] https://man7.org/linux/man-pages/man3/statvfs.3.html
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freeBytes := uint64(stat.Frsize) * uint64(stat.Bfree)
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availBytes := uint64(stat.Frsize) * uint64(stat.Bavail)
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totalBytes := uint64(stat.Frsize) * uint64(stat.Blocks)
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return DiskUsage{
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AvailBytes: availBytes,
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TotalBytes: totalBytes,
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UsedBytes: totalBytes - freeBytes,
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}, nil
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}
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