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use crate::collection::disks::IoCounters;
/// Returns zpool I/O stats. Pulls data from `sysctl
/// kstat.zfs.{POOL}.dataset.{objset-*}`
#[cfg(target_os = "freebsd")]
pub fn zfs_io_stats() -> anyhow::Result<Vec<IoCounters>> {
use sysctl::Sysctl;
let zfs_ctls: Vec<_> = sysctl::Ctl::new("kstat.zfs.")?
.into_iter()
.filter_map(|e| {
e.ok().and_then(|ctl| {
let name = ctl.name();
if let Ok(name) = name {
if name.contains("objset-")
&& (name.contains("dataset_name")
|| name.contains("nwritten")
|| name.contains("nread"))
{
Some(ctl)
} else {
None
}
} else {
None
}
})
})
.collect();
use itertools::Itertools;
let results: Vec<IoCounters> = zfs_ctls
.iter()
.chunks(3)
.into_iter()
.filter_map(|chunk| {
let mut nread = 0;
let mut nwrite = 0;
let mut ds_name = String::new();
for ctl in chunk {
if let Ok(name) = ctl.name() {
if name.contains("dataset_name") {
ds_name = ctl.value_string().ok()?;
} else if name.contains("nread") {
if let Ok(sysctl::CtlValue::U64(val)) = ctl.value() {
nread = val;
}
} else if name.contains("nwritten") {
if let Ok(sysctl::CtlValue::U64(val)) = ctl.value() {
nwrite = val;
}
}
}
}
Some(IoCounters::new(ds_name, nread, nwrite))
})
.collect();
Ok(results)
}
/// Returns zpool I/O stats. Pulls data from `/proc/spl/kstat/zfs/*/objset-*`.
#[cfg(target_os = "linux")]
pub fn zfs_io_stats() -> anyhow::Result<Vec<IoCounters>> {
if let Ok(zpools) = std::fs::read_dir("/proc/spl/kstat/zfs") {
let zpools_vec: Vec<std::path::PathBuf> = zpools
.filter_map(|e| {
e.ok().and_then(|d| {
let p = d.path();
if p.is_dir() { Some(p) } else { None }
})
})
.collect();
let results = zpools_vec
.iter()
.filter_map(|zpool| {
// go through each pool
if let Ok(datasets) = std::fs::read_dir(zpool) {
let datasets_vec: Vec<std::path::PathBuf> =
datasets // go through dataset
.filter_map(|e| {
e.ok().and_then(|d| {
let p = d.path();
if p.is_file() && p.to_str()?.contains("objset-") {
Some(p)
} else {
None
}
})
})
.collect();
let io_counters: Vec<IoCounters> = datasets_vec
.iter()
.filter_map(|ds| {
// get io-counter from each dataset
if let Ok(contents) = std::fs::read_to_string(ds) {
let mut read = 0;
let mut write = 0;
let mut name = "";
contents.lines().for_each(|line| {
if let Some((label, value)) = line.split_once(' ') {
match label {
"dataset_name" => {
if let Some((_type, val)) =
value.trim_start().rsplit_once(' ')
{
name = val;
}
}
"nwritten" => {
if let Some((_type, val)) =
value.trim_start().rsplit_once(' ')
{
if let Ok(number) = val.parse::<u64>() {
write = number;
}
}
}
"nread" => {
if let Some((_type, val)) =
value.trim_start().rsplit_once(' ')
{
if let Ok(number) = val.parse::<u64>() {
read = number;
}
}
}
_ => {}
}
}
});
let counter = IoCounters::new(name.to_owned(), read, write);
Some(counter)
} else {
None
}
})
.collect();
Some(io_counters)
} else {
None
}
})
.flatten()
.collect(); // combine io-counters
Ok(results)
} else {
Err(anyhow::anyhow!("Unable to open zfs proc directory"))
}
}