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// Copyright 2024 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !nofilesystem
// +build !nofilesystem
package collector
import (
"fmt"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
const (
defMountPointsExcluded = "^/(dev)($|/)"
defFSTypesExcluded = "^(kernfs|procfs|ptyfs|fdesc)$"
_VFS_NAMELEN = 32
_VFS_MNAMELEN = 1024
)
/*
* Go uses the NetBSD 9 ABI and thus syscall.SYS_GETVFSSTAT is compat_90_getvfsstat.
* We have to declare struct statvfs90 because it is not included in the unix package.
* See NetBSD/src/sys/compat/sys/statvfs.h.
*/
type statvfs90 struct {
F_flag uint
F_bsize uint
F_frsize uint
F_iosize uint
F_blocks uint64
F_bfree uint64
F_bavail uint64
F_bresvd uint64
F_files uint64
F_ffree uint64
F_favail uint64
F_fresvd uint64
F_syncreads uint64
F_syncwrites uint64
F_asyncreads uint64
F_asyncwrites uint64
F_fsidx [2]uint32
F_fsid uint32
F_namemax uint
F_owner uint32
F_spare [4]uint32
F_fstypename [_VFS_NAMELEN]byte
F_mntonname [_VFS_MNAMELEN]byte
F_mntfromname [_VFS_MNAMELEN]byte
cgo_pad [4]byte
}
func (c *filesystemCollector) GetStats() (stats []filesystemStats, err error) {
var mnt []statvfs90
if syscall.SYS_GETVFSSTAT != 356 /* compat_90_getvfsstat */ {
/*
* Catch if golang ever updates to newer ABI and bail.
*/
return nil, fmt.Errorf("getvfsstat: ABI mismatch")
}
for {
r1, _, errno := syscall.Syscall(syscall.SYS_GETVFSSTAT, uintptr(0), 0, unix.ST_NOWAIT)
if errno != 0 {
return nil, fmt.Errorf("getvfsstat: %s", string(errno))
}
mnt = make([]statvfs90, r1, r1)
r2, _, errno := syscall.Syscall(syscall.SYS_GETVFSSTAT, uintptr(unsafe.Pointer(&mnt[0])), unsafe.Sizeof(mnt[0])*r1, unix.ST_NOWAIT /* ST_NOWAIT */)
if errno != 0 {
return nil, fmt.Errorf("getvfsstat: %s", string(errno))
}
if r1 == r2 {
break
}
}
stats = []filesystemStats{}
for _, v := range mnt {
mountpoint := unix.ByteSliceToString(v.F_mntonname[:])
if c.mountPointFilter.ignored(mountpoint) {
c.logger.Debug("msg", "Ignoring mount point", "mountpoint", mountpoint)
continue
}
device := unix.ByteSliceToString(v.F_mntfromname[:])
fstype := unix.ByteSliceToString(v.F_fstypename[:])
if c.fsTypeFilter.ignored(fstype) {
c.logger.Debug("msg", "Ignoring fs type", "type", fstype)
continue
}
var ro float64
if (v.F_flag & unix.MNT_RDONLY) != 0 {
ro = 1
}
stats = append(stats, filesystemStats{
labels: filesystemLabels{
device: device,
mountPoint: mountpoint,
fsType: fstype,
},
size: float64(v.F_blocks) * float64(v.F_bsize),
free: float64(v.F_bfree) * float64(v.F_bsize),
avail: float64(v.F_bavail) * float64(v.F_bsize),
files: float64(v.F_files),
filesFree: float64(v.F_ffree),
ro: ro,
})
}
return stats, nil
}
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