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226c80c83c
Add support for allow lists of filesystem mount points and filesystem types. This allows for less messy regexps when you want to target only specific lists of mount points or filesystem types. Signed-off-by: Ben Kochie <superq@gmail.com>
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.mountPointFilter.ignored(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.fsTypeFilter.ignored(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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