You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

468 lines
10 KiB

// SPDX-License-Identifier: GPL-2.0-or-later
// LVM2 backend for uvol
// (c) 2022 Daniel Golle <daniel@makrotopia.org>
//
// This plugin uses LVM2 as a storage backend for uvol.
//
// By default, volumes are allocated on the physical device used for booting,
// the LVM2 PV and VG are initialized auto-magically by the 'autopart' script.
// By setting the UCI option 'vg_name' in the 'uvol' section in /etc/config/fstab
// you may set an arbitrary LVM2 volume group to back uvol instad.
let lvm_exec = "/sbin/lvm";
function lvm(cmd, ...args) {
let lvm_json_cmds = [ "lvs", "pvs", "vgs" ];
try {
let json_param = "";
if (cmd in lvm_json_cmds)
json_param = "--reportformat json --units b ";
let stdout = fs.popen(sprintf("LVM_SUPPRESS_FD_WARNINGS=1 %s %s %s%s", lvm_exec, cmd, json_param, join(" ", args)));
let tmp;
if (stdout) {
tmp = stdout.read("all");
let ret = {};
ret.retval = stdout.close();
if (json_param) {
let data = json(tmp);
if (data.report)
ret.report = data.report[0];
} else {
ret.stdout = trim(tmp);
}
return ret;
} else {
printf("lvm cli command failed: %s\n", fs.error());
}
} catch(e) {
printf("Failed to parse lvm cli output: %s\n%s\n", e, e.stacktrace[0].context);
}
return null;
}
function pvs() {
let fstab = cursor.get_all('fstab');
for (let k, section in fstab) {
if (section['.type'] != 'uvol' || !section.vg_name)
continue;
return section.vg_name;
}
include("/usr/lib/uvol/blockdev_common.uc");
let rootdev = blockdev_common.get_partition(blockdev_common.get_bootdev(), 0);
if (!rootdev)
return null;
let tmp = lvm("pvs", "-o", "vg_name", "-S", sprintf("\"pv_name=~^/dev/%s.*\$\"", rootdev));
if (tmp.report.pv[0])
return tmp.report.pv[0].vg_name;
else
return null;
}
function vgs(vg_name) {
let tmp = lvm("vgs", "-o", "vg_extent_size,vg_extent_count,vg_free_count", "-S", sprintf("\"vg_name=%s\"", vg_name));
let ret = null;
if (tmp && tmp.report.vg) {
ret = tmp.report.vg;
for (let r in ret) {
r.vg_extent_size = +(rtrim(r.vg_extent_size, "B"));
r.vg_extent_count = +r.vg_extent_count;
r.vg_free_count = +r.vg_free_count;
}
}
if (ret)
return ret[0];
else
return null;
}
function lvs(vg_name, vol_name, extra_exp) {
let ret = [];
if (!vol_name)
vol_name = ".*";
let lvexpr = sprintf("\"lvname=~^[rw][owp]_%s\$ && vg_name=%s%s%s\"",
vol_name, vg_name, extra_exp?" && ":"", extra_exp?extra_exp:"");
let tmp = lvm("lvs", "-o", "lv_active,lv_name,lv_full_name,lv_size,lv_path,lv_dm_path", "-S", lvexpr);
if (tmp && tmp.report.lv) {
ret = tmp.report.lv;
for (let r in ret) {
r.lv_size = +(rtrim(r.lv_size, "B"));
r.lv_active = (r.lv_active == "active");
}
}
return ret;
}
function getdev(lv) {
if (!lv)
return null;
for (let dms in fs.glob("/sys/devices/virtual/block/dm-*")) {
let f = fs.open(sprintf("%s/dm/name", dms), "r");
if (!f)
continue;
let dm_name = trim(f.read("all"));
f.close();
if ( split(lv.lv_dm_path, '/')[-1] == dm_name )
return split(dms, '/')[-1]
}
return null;
}
function lvm_init(ctx) {
cursor = ctx.cursor;
fs = ctx.fs;
if (type(fs.access) == "function" && !fs.access(lvm_exec, "x"))
return false;
vg_name = pvs();
if (!vg_name)
return false;
vg = vgs(vg_name);
uvol_uci_add = ctx.uci_add;
uvol_uci_commit = ctx.uci_commit;
uvol_uci_remove = ctx.uci_remove;
uvol_uci_init = ctx.uci_init;
return true;
}
function lvm_free() {
if (!vg || !vg.vg_free_count || !vg.vg_extent_size)
return 2;
return sprintf("%d", vg.vg_free_count * vg.vg_extent_size);
}
function lvm_total() {
if (!vg || !vg.vg_extent_count || !vg.vg_extent_size)
return 2;
return sprintf("%d", vg.vg_extent_count * vg.vg_extent_size);
}
function lvm_align() {
if (!vg || !vg.vg_extent_size)
return 2;
return sprintf("%d", vg.vg_extent_size);
}
function lvm_list(vol_name) {
let vols = [];
if (!vg_name)
return vols;
let res = lvs(vg_name, vol_name);
for (let lv in res) {
let vol = {};
if (substr(lv.lv_name, 3, 1) == ".")
continue;
vol.name = substr(lv.lv_name, 3);
vol.mode = substr(lv.lv_name, 0, 2);
if (!lv.lv_active) {
if (vol.mode == "ro")
vol.mode = "rd";
if (vol.mode == "rw")
vol.mode = "wd";
}
vol.size = lv.lv_size;
push(vols, vol);
}
return vols;
}
function lvm_size(vol_name) {
if (!vol_name || !vg_name)
return 2;
let res = lvs(vg_name, vol_name);
if (!res[0])
return 2;
return sprintf("%d", res[0].lv_size);
}
function lvm_status(vol_name) {
if (!vol_name || !vg_name)
return 22;
let res = lvs(vg_name, vol_name);
if (!res[0])
return 2;
let mode = substr(res[0].lv_name, 0, 2);
if ((mode != "ro" && mode != "rw") || !res[0].lv_active)
return 1;
return 0;
}
function lvm_device(vol_name) {
if (!vol_name || !vg_name)
return 22;
let res = lvs(vg_name, vol_name);
if (!res[0])
return 2;
let mode = substr(res[0].lv_name, 0, 2);
if ((mode != "ro" && mode != "rw") || !res[0].lv_active)
return 22;
return getdev(res[0]);
}
function lvm_updown(vol_name, up) {
if (!vol_name || !vg_name)
return 22;
let res = lvs(vg_name, vol_name);
if (!res[0])
return 2;
let lv = res[0];
if (!lv.lv_path)
return 2;
if (up && (wildcard(lv.lv_path, "/dev/*/wo_*") ||
wildcard(lv.lv_path, "/dev/*/wp_*")))
return 22;
if (up)
uvol_uci_commit(vol_name);
if (lv.lv_active == up)
return 0;
if (!up) {
let devname = getdev(lv);
if (devname)
system(sprintf("umount /dev/%s", devname));
}
let lvchange_r = lvm("lvchange", up?"-k":"-a", "n", lv.lv_full_name);
if (up && lvchange_r.retval != 0)
return lvchange_r.retval;
lvchange_r = lvm("lvchange", up?"-a":"-k", "y", lv.lv_full_name);
if (lvchange_r.retval != 0)
return lvchange_r.retval;
return 0
}
function lvm_up(vol_name) {
return lvm_updown(vol_name, true);
}
function lvm_down(vol_name) {
return lvm_updown(vol_name, false);
}
function lvm_create(vol_name, vol_size, vol_mode) {
if (!vol_name || !vg_name)
return 22;
vol_size = +vol_size;
if (vol_size <= 0)
return 22;
let res = lvs(vg_name, vol_name);
if (res[0])
return 17;
let size_ext = vol_size / vg.vg_extent_size;
if (vol_size % vg.vg_extent_size)
++size_ext;
let lvmode, mode;
if (vol_mode == "ro" || vol_mode == "wo") {
lvmode = "r";
mode = "wo";
} else if (vol_mode == "rw") {
lvmode = "rw";
mode = "wp";
} else {
return 22;
}
let ret = lvm("lvcreate", "-p", lvmode, "-a", "n", "-y", "-W", "n", "-Z", "n", "-n", sprintf("%s_%s", mode, vol_name), "-l", size_ext, vg_name);
if (ret.retval != 0 || lvmode == "r")
return ret.retval;
let lv = lvs(vg_name, vol_name);
if (!lv[0] || !lv[0].lv_full_name)
return 22;
lv = lv[0];
let ret = lvm("lvchange", "-a", "y", lv.lv_full_name);
if (ret.retval != 0)
return ret.retval;
let use_f2fs = (lv.lv_size > (100 * 1024 * 1024));
if (use_f2fs) {
let mkfs_ret = system(sprintf("/usr/sbin/mkfs.f2fs -f -l \"%s\" \"%s\"", vol_name, lv.lv_path));
if (mkfs_ret != 0 && mkfs_ret != 134) {
lvchange_r = lvm("lvchange", "-a", "n", lv.lv_full_name);
if (lvchange_r.retval != 0)
return lvchange_r.retval;
return mkfs_ret;
}
} else {
let mkfs_ret = system(sprintf("/usr/sbin/mke2fs -F -L \"%s\" \"%s\"", vol_name, lv.lv_path));
if (mkfs_ret != 0) {
lvchange_r = lvm("lvchange", "-a", "n", lv.lv_full_name);
if (lvchange_r.retval != 0)
return lvchange_r.retval;
return mkfs_ret;
}
}
uvol_uci_add(vol_name, sprintf("/dev/%s", getdev(lv)), "rw");
ret = lvm("lvchange", "-a", "n", lv.lv_full_name);
if (ret.retval != 0)
return ret.retval;
ret = lvm("lvrename", vg_name, sprintf("wp_%s", vol_name), sprintf("rw_%s", vol_name));
if (ret.retval != 0)
return ret.retval;
return 0;
}
function lvm_remove(vol_name) {
if (!vol_name || !vg_name)
return 22;
let res = lvs(vg_name, vol_name);
if (!res[0])
return 2;
if (res[0].lv_active)
return 16;
let ret = lvm("lvremove", "-y", res[0].lv_full_name);
if (ret.retval != 0)
return ret.retval;
uvol_uci_remove(vol_name);
uvol_uci_commit(vol_name);
return 0;
}
function lvm_dd(in_fd, out_fd, vol_size) {
let rem = vol_size;
let buf;
while ((buf = in_fd.read(vg.vg_extent_size)) && (rem > 0)) {
rem -= length(buf);
if (rem < 0) {
buf = substr(buf, 0, rem);
}
out_fd.write(buf);
}
return rem;
}
function lvm_write(vol_name, vol_size) {
if (!vol_name || !vg_name)
return 22;
let lv = lvs(vg_name, vol_name);
if (!lv[0] || !lv[0].lv_full_name)
return 2;
lv = lv[0];
vol_size = +vol_size;
if (vol_size > lv.lv_size)
return 27;
if (wildcard(lv.lv_path, "/dev/*/wo_*")) {
let ret = lvm("lvchange", "-p", "rw", lv.lv_full_name);
if (ret.retval != 0)
return ret.retval;
let ret = lvm("lvchange", "-a", "y", lv.lv_full_name);
if (ret.retval != 0)
return ret.retval;
let volfile = fs.open(lv.lv_path, "w");
let ret = lvm_dd(fs.stdin, volfile, vol_size);
volfile.close();
if (ret < 0) {
printf("more %d bytes data than given size!\n", -ret);
}
if (ret > 0) {
printf("reading finished %d bytes before given size!\n", ret);
}
uvol_uci_add(vol_name, sprintf("/dev/%s", getdev(lv)), "ro");
let ret = lvm("lvchange", "-a", "n", lv.lv_full_name);
if (ret.retval != 0)
return ret.retval;
let ret = lvm("lvchange", "-p", "r", lv.lv_full_name);
if (ret.retval != 0)
return ret.retval;
let ret = lvm("lvrename", vg_name, sprintf("wo_%s", vol_name), sprintf("ro_%s", vol_name));
if (ret.retval != 0)
return ret.retval;
} else {
return 22;
}
return 0;
}
function lvm_detect() {
let temp_up = [];
let inactive_lv = lvs(vg_name, null, "lv_skip_activation!=0");
for (let lv in inactive_lv) {
lvm("lvchange", "-k", "n", lv.lv_full_name);
lvm("lvchange", "-a", "y", lv.lv_full_name);
push(temp_up, lv.lv_full_name);
}
sleep(1000);
uvol_uci_init();
for (let lv in lvs(vg_name)) {
let vol_name = substr(lv.lv_name, 3);
let vol_mode = substr(lv.lv_name, 0, 2);
uvol_uci_add(vol_name, sprintf("/dev/%s", getdev(lv)), vol_mode);
}
uvol_uci_commit();
for (let lv_full_name in temp_up) {
lvm("lvchange", "-a", "n", lv_full_name);
lvm("lvchange", "-k", "y", lv_full_name);
}
return 0;
}
function lvm_boot() {
return 0;
}
backend.backend = "LVM";
backend.priority = 50;
backend.init = lvm_init;
backend.boot = lvm_boot;
backend.detect = lvm_detect;
backend.free = lvm_free;
backend.align = lvm_align;
backend.total = lvm_total;
backend.list = lvm_list;
backend.size = lvm_size;
backend.status = lvm_status;
backend.device = lvm_device;
backend.up = lvm_up;
backend.down = lvm_down;
backend.create = lvm_create;
backend.remove = lvm_remove;
backend.write = lvm_write;