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