133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
// Copyright 2024 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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//go:build !nofilesystem
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// +build !nofilesystem
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package collector
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import (
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"fmt"
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"syscall"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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const (
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defMountPointsExcluded = "^/(dev)($|/)"
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defFSTypesExcluded = "^(kernfs|procfs|ptyfs|fdesc)$"
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_VFS_NAMELEN = 32
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_VFS_MNAMELEN = 1024
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)
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/*
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* Go uses the NetBSD 9 ABI and thus syscall.SYS_GETVFSSTAT is compat_90_getvfsstat.
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* We have to declare struct statvfs90 because it is not included in the unix package.
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* See NetBSD/src/sys/compat/sys/statvfs.h.
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*/
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type statvfs90 struct {
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F_flag uint
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F_bsize uint
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F_frsize uint
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F_iosize uint
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F_blocks uint64
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F_bfree uint64
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F_bavail uint64
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F_bresvd uint64
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F_files uint64
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F_ffree uint64
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F_favail uint64
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F_fresvd uint64
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F_syncreads uint64
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F_syncwrites uint64
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F_asyncreads uint64
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F_asyncwrites uint64
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F_fsidx [2]uint32
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F_fsid uint32
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F_namemax uint
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F_owner uint32
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F_spare [4]uint32
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F_fstypename [_VFS_NAMELEN]byte
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F_mntonname [_VFS_MNAMELEN]byte
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F_mntfromname [_VFS_MNAMELEN]byte
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cgo_pad [4]byte
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}
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func (c *filesystemCollector) GetStats() (stats []filesystemStats, err error) {
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var mnt []statvfs90
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if syscall.SYS_GETVFSSTAT != 356 /* compat_90_getvfsstat */ {
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/*
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* Catch if golang ever updates to newer ABI and bail.
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*/
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return nil, fmt.Errorf("getvfsstat: ABI mismatch")
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}
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for {
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r1, _, errno := syscall.Syscall(syscall.SYS_GETVFSSTAT, uintptr(0), 0, unix.ST_NOWAIT)
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if errno != 0 {
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return nil, fmt.Errorf("getvfsstat: %s", string(errno))
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}
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mnt = make([]statvfs90, r1, r1)
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r2, _, errno := syscall.Syscall(syscall.SYS_GETVFSSTAT, uintptr(unsafe.Pointer(&mnt[0])), unsafe.Sizeof(mnt[0])*r1, unix.ST_NOWAIT /* ST_NOWAIT */)
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if errno != 0 {
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return nil, fmt.Errorf("getvfsstat: %s", string(errno))
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}
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if r1 == r2 {
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break
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}
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}
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stats = []filesystemStats{}
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for _, v := range mnt {
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mountpoint := unix.ByteSliceToString(v.F_mntonname[:])
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if c.excludedMountPointsPattern.MatchString(mountpoint) {
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c.logger.Debug("msg", "Ignoring mount point", "mountpoint", mountpoint)
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continue
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}
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device := unix.ByteSliceToString(v.F_mntfromname[:])
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fstype := unix.ByteSliceToString(v.F_fstypename[:])
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if c.excludedFSTypesPattern.MatchString(fstype) {
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c.logger.Debug("msg", "Ignoring fs type", "type", fstype)
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continue
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}
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var ro float64
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if (v.F_flag & unix.MNT_RDONLY) != 0 {
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ro = 1
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}
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stats = append(stats, filesystemStats{
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labels: filesystemLabels{
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device: device,
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mountPoint: mountpoint,
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fsType: fstype,
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},
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size: float64(v.F_blocks) * float64(v.F_bsize),
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free: float64(v.F_bfree) * float64(v.F_bsize),
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avail: float64(v.F_bavail) * float64(v.F_bsize),
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files: float64(v.F_files),
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filesFree: float64(v.F_ffree),
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ro: ro,
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})
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}
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return stats, nil
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}
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