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lvm2/lib/locking/lvmlockd.c
David Teigland 6a8bd0c509 lvmlockd: fix cachevol locking 
When a cachevol LV is attached, have the LV keep it's lock
allocated.  The lock on the cachevol won't be used while
it's attached.  When the cachevol is split a new lock does
not need to be allocated.  (Applies to cachevol usage by
both dm-cache and dm-writecache.)
2019-10-25 14:08:59 -05:00

3055 lines
80 KiB
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/*
* Copyright (C) 2014-2015 Red Hat, Inc.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*/
#include "lib/misc/lib.h"
#include "lib/commands/toolcontext.h"
#include "lib/metadata/metadata.h"
#include "lib/metadata/segtype.h"
#include "lib/activate/activate.h"
#include "lib/locking/lvmlockd.h"
#include "lib/cache/lvmcache.h"
#include "daemons/lvmlockd/lvmlockd-client.h"
#include <mntent.h>
static daemon_handle _lvmlockd;
static const char *_lvmlockd_socket = NULL;
static int _use_lvmlockd = 0; /* is 1 if command is configured to use lvmlockd */
static int _lvmlockd_connected = 0; /* is 1 if command is connected to lvmlockd */
static int _lvmlockd_init_failed = 0; /* used to suppress further warnings */
void lvmlockd_set_socket(const char *sock)
{
_lvmlockd_socket = sock;
}
/*
* Set directly from global/use_lvmlockd
*/
void lvmlockd_set_use(int use)
{
_use_lvmlockd = use;
}
/*
* Returns the value of global/use_lvmlockd being used by the command.
*/
int lvmlockd_use(void)
{
return _use_lvmlockd;
}
/*
* The command continues even if init and/or connect fail,
* because the command is allowed to use local VGs without lvmlockd,
* and is allowed to read lockd VGs without locks from lvmlockd.
*/
void lvmlockd_init(struct cmd_context *cmd)
{
if (!_use_lvmlockd) {
/* Should never happen, don't call init when not using lvmlockd. */
log_error("Should not initialize lvmlockd with use_lvmlockd=0.");
}
if (!_lvmlockd_socket) {
log_warn("WARNING: lvmlockd socket location is not configured.");
_lvmlockd_init_failed = 1;
}
if (!!access(LVMLOCKD_PIDFILE, F_OK)) {
log_warn("WARNING: lvmlockd process is not running.");
_lvmlockd_init_failed = 1;
} else {
_lvmlockd_init_failed = 0;
}
}
void lvmlockd_connect(void)
{
if (!_use_lvmlockd) {
/* Should never happen, don't call connect when not using lvmlockd. */
log_error("Should not connect to lvmlockd with use_lvmlockd=0.");
}
if (_lvmlockd_connected) {
/* Should never happen, only call connect once. */
log_error("lvmlockd is already connected.");
}
if (_lvmlockd_init_failed)
return;
_lvmlockd = lvmlockd_open(_lvmlockd_socket);
if (_lvmlockd.socket_fd >= 0 && !_lvmlockd.error) {
log_debug("Successfully connected to lvmlockd on fd %d.", _lvmlockd.socket_fd);
_lvmlockd_connected = 1;
} else {
log_warn("WARNING: lvmlockd connect failed.");
}
}
void lvmlockd_disconnect(void)
{
if (_lvmlockd_connected)
daemon_close(_lvmlockd);
_lvmlockd_connected = 0;
}
/* Translate the result strings from lvmlockd to bit flags. */
static void _flags_str_to_lockd_flags(const char *flags_str, uint32_t *lockd_flags)
{
if (strstr(flags_str, "NO_LOCKSPACES"))
*lockd_flags |= LD_RF_NO_LOCKSPACES;
if (strstr(flags_str, "NO_GL_LS"))
*lockd_flags |= LD_RF_NO_GL_LS;
if (strstr(flags_str, "NO_LM"))
*lockd_flags |= LD_RF_NO_LM;
if (strstr(flags_str, "DUP_GL_LS"))
*lockd_flags |= LD_RF_DUP_GL_LS;
if (strstr(flags_str, "WARN_GL_REMOVED"))
*lockd_flags |= LD_RF_WARN_GL_REMOVED;
if (strstr(flags_str, "SH_EXISTS"))
*lockd_flags |= LD_RF_SH_EXISTS;
}
/*
* evaluate the reply from lvmlockd, check for errors, extract
* the result and lockd_flags returned by lvmlockd.
* 0 failure (no result/lockd_flags set)
* 1 success (result/lockd_flags set)
*/
/*
* This is an arbitrary number that we know lvmlockd
* will not return. daemon_reply_int reverts to this
* value if it finds no result value.
*/
#define NO_LOCKD_RESULT (-1000)
static int _lockd_result(daemon_reply reply, int *result, uint32_t *lockd_flags)
{
int reply_result;
const char *flags_str = NULL;
const char *lock_type = NULL;
*result = -1;
if (reply.error) {
log_error("lockd_result reply error %d", reply.error);
return 0;
}
if (strcmp(daemon_reply_str(reply, "response", ""), "OK")) {
log_error("lockd_result bad response");
return 0;
}
reply_result = daemon_reply_int(reply, "op_result", NO_LOCKD_RESULT);
if (reply_result == NO_LOCKD_RESULT) {
log_error("lockd_result no op_result");
return 0;
}
/* The lock_type that lvmlockd used for locking. */
lock_type = daemon_reply_str(reply, "lock_type", "none");
*result = reply_result;
if (lockd_flags) {
if ((flags_str = daemon_reply_str(reply, "result_flags", NULL)))
_flags_str_to_lockd_flags(flags_str, lockd_flags);
}
log_debug("lockd_result %d flags %s lm %s", reply_result,
flags_str ? flags_str : "none", lock_type);
return 1;
}
static daemon_reply _lockd_send(const char *req_name, ...)
{
va_list ap;
daemon_reply repl;
daemon_request req;
req = daemon_request_make(req_name);
va_start(ap, req_name);
daemon_request_extend_v(req, ap);
va_end(ap);
repl = daemon_send(_lvmlockd, req);
daemon_request_destroy(req);
return repl;
}
/*
* result/lockd_flags are values returned from lvmlockd.
*
* return 0 (failure)
* return 1 (result/lockd_flags indicate success/failure)
*
* return 1 result 0 (success)
* return 1 result < 0 (failure)
*
* caller may ignore result < 0 failure depending on
* lockd_flags and the specific command/mode.
*
* When this function returns 0 (failure), no result/lockd_flags
* were obtained from lvmlockd.
*
* When this function returns 1 (success), result/lockd_flags may
* have been obtained from lvmlockd. This lvmlockd result may
* indicate a locking failure.
*/
static int _lockd_request(struct cmd_context *cmd,
const char *req_name,
const char *vg_name,
const char *vg_lock_type,
const char *vg_lock_args,
const char *lv_name,
const char *lv_uuid,
const char *lv_lock_args,
const char *mode,
const char *opts,
int *result,
uint32_t *lockd_flags)
{
const char *cmd_name = get_cmd_name();
daemon_reply reply;
int pid = getpid();
*result = 0;
*lockd_flags = 0;
if (!strcmp(mode, "na"))
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
/* cmd and pid are passed for informational and debugging purposes */
if (!cmd_name || !cmd_name[0])
cmd_name = "none";
if (vg_name && lv_name) {
reply = _lockd_send(req_name,
"cmd = %s", cmd_name,
"pid = " FMTd64, (int64_t) pid,
"mode = %s", mode,
"opts = %s", opts ?: "none",
"vg_name = %s", vg_name,
"lv_name = %s", lv_name,
"lv_uuid = %s", lv_uuid,
"vg_lock_type = %s", vg_lock_type ?: "none",
"vg_lock_args = %s", vg_lock_args ?: "none",
"lv_lock_args = %s", lv_lock_args ?: "none",
NULL);
if (!_lockd_result(reply, result, lockd_flags))
goto fail;
log_debug("lvmlockd %s %s vg %s lv %s result %d %x",
req_name, mode, vg_name, lv_name, *result, *lockd_flags);
} else if (vg_name) {
reply = _lockd_send(req_name,
"cmd = %s", cmd_name,
"pid = " FMTd64, (int64_t) pid,
"mode = %s", mode,
"opts = %s", opts ?: "none",
"vg_name = %s", vg_name,
"vg_lock_type = %s", vg_lock_type ?: "none",
"vg_lock_args = %s", vg_lock_args ?: "none",
NULL);
if (!_lockd_result(reply, result, lockd_flags))
goto fail;
log_debug("lvmlockd %s %s vg %s result %d %x",
req_name, mode, vg_name, *result, *lockd_flags);
} else {
reply = _lockd_send(req_name,
"cmd = %s", cmd_name,
"pid = " FMTd64, (int64_t) pid,
"mode = %s", mode,
"opts = %s", opts ?: "none",
"vg_lock_type = %s", vg_lock_type ?: "none",
NULL);
if (!_lockd_result(reply, result, lockd_flags))
goto fail;
log_debug("lvmlockd %s %s result %d %x",
req_name, mode, *result, *lockd_flags);
}
daemon_reply_destroy(reply);
/* result/lockd_flags have lvmlockd result */
return 1;
fail:
/* no result was obtained from lvmlockd */
log_error("lvmlockd %s %s failed no result", req_name, mode);
daemon_reply_destroy(reply);
return 0;
}
/*
* Eventually add an option to specify which pv the lvmlock lv should be placed on.
*/
#define ONE_MB_IN_BYTES 1048576
static int _create_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg,
const char *lock_lv_name, int num_mb)
{
uint32_t lv_size_bytes;
uint32_t extent_bytes;
uint32_t total_extents;
struct logical_volume *lv;
struct lvcreate_params lp = {
.activate = CHANGE_ALY,
.alloc = ALLOC_INHERIT,
.major = -1,
.minor = -1,
.permission = LVM_READ | LVM_WRITE,
.pvh = &vg->pvs,
.read_ahead = DM_READ_AHEAD_NONE,
.stripes = 1,
.vg_name = vg->name,
.lv_name = dm_pool_strdup(cmd->mem, lock_lv_name),
.zero = 1,
};
lv_size_bytes = num_mb * ONE_MB_IN_BYTES; /* size of sanlock LV in bytes */
extent_bytes = vg->extent_size * SECTOR_SIZE; /* size of one extent in bytes */
total_extents = lv_size_bytes / extent_bytes; /* number of extents in sanlock LV */
lp.extents = total_extents;
log_debug("Creating lvmlock LV for sanlock with size %um %ub %u extents", num_mb, lv_size_bytes, lp.extents);
dm_list_init(&lp.tags);
if (!(lp.segtype = get_segtype_from_string(vg->cmd, SEG_TYPE_NAME_STRIPED)))
return_0;
lv = lv_create_single(vg, &lp);
if (!lv) {
log_error("Failed to create sanlock lv %s in vg %s", lock_lv_name, vg->name);
return 0;
}
vg->sanlock_lv = lv;
return 1;
}
static int _remove_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg)
{
if (!lv_remove(vg->sanlock_lv)) {
log_error("Failed to remove sanlock LV %s/%s", vg->name, vg->sanlock_lv->name);
return 0;
}
log_debug("sanlock lvmlock LV removed");
return 1;
}
static int _extend_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg, int extend_mb)
{
struct device *dev;
char path[PATH_MAX];
uint64_t old_size_bytes;
uint64_t new_size_bytes;
uint32_t extend_bytes;
uint32_t extend_sectors;
uint32_t new_size_sectors;
struct logical_volume *lv = vg->sanlock_lv;
struct lvresize_params lp = {
.sign = SIGN_NONE,
.size = 0,
.percent = PERCENT_NONE,
.resize = LV_EXTEND,
.force = 1,
};
uint64_t i;
extend_bytes = extend_mb * ONE_MB_IN_BYTES;
extend_sectors = extend_bytes / SECTOR_SIZE;
new_size_sectors = lv->size + extend_sectors;
old_size_bytes = lv->size * SECTOR_SIZE;
log_debug("Extend sanlock LV from %llus (%llu bytes) to %us (%u bytes)",
(unsigned long long)lv->size,
(unsigned long long)old_size_bytes,
(uint32_t)new_size_sectors,
(uint32_t)(new_size_sectors * SECTOR_SIZE));
lp.size = new_size_sectors;
if (!lv_resize(lv, &lp, &vg->pvs)) {
log_error("Extend sanlock LV %s to size %s failed.",
display_lvname(lv), display_size(cmd, lp.size));
return 0;
}
if (!lv_refresh_suspend_resume(lv)) {
log_error("Failed to refresh sanlock LV %s after extend.", display_lvname(lv));
return 0;
}
new_size_bytes = lv->size * SECTOR_SIZE;
if (dm_snprintf(path, sizeof(path), "%s/mapper/%s-%s", lv->vg->cmd->dev_dir,
lv->vg->name, lv->name) < 0) {
log_error("Extend sanlock LV %s name too long - extended size not zeroed.",
display_lvname(lv));
return 0;
}
log_debug("Extend sanlock LV zeroing %u bytes from offset %llu to %llu",
(uint32_t)(new_size_bytes - old_size_bytes),
(unsigned long long)old_size_bytes,
(unsigned long long)new_size_bytes);
log_print("Zeroing %u MiB on extended internal lvmlock LV...", extend_mb);
if (!(dev = dev_cache_get(cmd, path, NULL))) {
log_error("Extend sanlock LV %s cannot find device.", display_lvname(lv));
return 0;
}
if (!label_scan_open(dev)) {
log_error("Extend sanlock LV %s cannot open device.", display_lvname(lv));
return 0;
}
for (i = 0; i < extend_mb; i++) {
if (!dev_write_zeros(dev, old_size_bytes + (i * ONE_MB_IN_BYTES), ONE_MB_IN_BYTES)) {
log_error("Extend sanlock LV %s cannot zero device at " FMTu64 ".",
display_lvname(lv), (old_size_bytes + i * ONE_MB_IN_BYTES));
label_scan_invalidate(dev);
return 0;
}
}
label_scan_invalidate(dev);
return 1;
}
/* When one host does _extend_sanlock_lv, the others need to refresh the size. */
static int _refresh_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg)
{
if (!lv_refresh_suspend_resume(vg->sanlock_lv)) {
log_error("Failed to refresh %s.", vg->sanlock_lv->name);
return 0;
}
return 1;
}
/*
* Called at the beginning of lvcreate in a sanlock VG to ensure
* that there is space in the sanlock LV for a new lock. If it's
* full, then this extends it.
*/
int handle_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
int extend_mb;
int result;
int ret;
if (!_use_lvmlockd)
return 1;
if (!_lvmlockd_connected)
return 0;
extend_mb = find_config_tree_int(cmd, global_sanlock_lv_extend_CFG, NULL);
/*
* User can choose to not automatically extend the lvmlock LV
* so they can manually extend it.
*/
if (!extend_mb)
return 1;
/*
* Another host may have extended the lvmlock LV already.
* Refresh so that we'll find the new space they added
* when we search for new space.
*/
if (!_refresh_sanlock_lv(cmd, vg))
return 0;
/*
* Ask lvmlockd/sanlock to look for an unused lock.
*/
reply = _lockd_send("find_free_lock",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
/* No space on the lvmlock lv for a new lease. */
if (result == -EMSGSIZE)
ret = _extend_sanlock_lv(cmd, vg, extend_mb);
daemon_reply_destroy(reply);
return ret;
}
static int _activate_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg)
{
if (!activate_lv(cmd, vg->sanlock_lv)) {
log_error("Failed to activate sanlock lv %s/%s", vg->name, vg->sanlock_lv->name);
return 0;
}
return 1;
}
static int _deactivate_sanlock_lv(struct cmd_context *cmd, struct volume_group *vg)
{
if (!deactivate_lv(cmd, vg->sanlock_lv)) {
log_error("Failed to deactivate sanlock lv %s/%s", vg->name, vg->sanlock_lv->name);
return 0;
}
return 1;
}
static int _init_vg_dlm(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
const char *reply_str;
const char *vg_lock_args = NULL;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
reply = _lockd_send("init_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", "dlm",
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
result = -ELOCKD;
} else {
ret = (result < 0) ? 0 : 1;
}
switch (result) {
case 0:
break;
case -ELOCKD:
log_error("VG %s init failed: lvmlockd not available", vg->name);
break;
case -EARGS:
log_error("VG %s init failed: invalid parameters for dlm", vg->name);
break;
case -EMANAGER:
log_error("VG %s init failed: lock manager dlm is not running", vg->name);
break;
case -EPROTONOSUPPORT:
log_error("VG %s init failed: lock manager dlm is not supported by lvmlockd", vg->name);
break;
case -EEXIST:
log_error("VG %s init failed: a lockspace with the same name exists", vg->name);
break;
default:
log_error("VG %s init failed: %d", vg->name, result);
}
if (!ret)
goto out;
if (!(reply_str = daemon_reply_str(reply, "vg_lock_args", NULL))) {
log_error("VG %s init failed: lock_args not returned", vg->name);
ret = 0;
goto out;
}
if (!(vg_lock_args = dm_pool_strdup(cmd->mem, reply_str))) {
log_error("VG %s init failed: lock_args alloc failed", vg->name);
ret = 0;
goto out;
}
vg->lock_type = "dlm";
vg->lock_args = vg_lock_args;
if (!vg_write(vg) || !vg_commit(vg)) {
log_error("VG %s init failed: vg_write vg_commit", vg->name);
ret = 0;
goto out;
}
ret = 1;
out:
daemon_reply_destroy(reply);
return ret;
}
static int _init_vg_sanlock(struct cmd_context *cmd, struct volume_group *vg, int lv_lock_count)
{
daemon_reply reply;
const char *reply_str;
const char *vg_lock_args = NULL;
const char *opts = NULL;
struct pv_list *pvl;
struct device *sector_dev;
uint32_t sector_size = 0;
unsigned int physical_block_size, logical_block_size;
int num_mb = 0;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
/*
* We need the sector size to know what size to create the LV,
* but we're not sure what PV the LV will be allocated from, so
* just get the sector size of the first PV.
*/
dm_list_iterate_items(pvl, &vg->pvs) {
if (!dev_get_direct_block_sizes(pvl->pv->dev, &physical_block_size, &logical_block_size))
continue;
if (!sector_size) {
sector_size = logical_block_size;
sector_dev = pvl->pv->dev;
} else if (sector_size != logical_block_size) {
log_error("Inconsistent logical block sizes for %s and %s.",
dev_name(pvl->pv->dev), dev_name(sector_dev));
return 0;
}
}
log_debug("Using sector size %u for sanlock LV", sector_size);
/* Base starting size of sanlock LV is 256MB/1GB for 512/4K sectors */
switch (sector_size) {
case 512: num_mb = 256; break;
case 4096: num_mb = 1024; break;
default: log_error("Unknown sector size %u.", sector_size); return 0;
}
/*
* Creating the sanlock LV writes the VG containing the new lvmlock
* LV, then activates the lvmlock LV. The lvmlock LV must be active
* before we ask lvmlockd to initialize the VG because sanlock needs
* to initialize leases on the lvmlock LV.
*
* When converting an existing VG to sanlock, the sanlock lv needs to
* be large enough to hold leases for all existing lvs needing locks.
* One sanlock lease uses 1MB/8MB for 512/4K sector size devices, so
* increase the initial size by 1MB/8MB for each existing lv.
*/
if (lv_lock_count) {
if (sector_size == 512)
num_mb += lv_lock_count;
else if (sector_size == 4096)
num_mb += 8 * lv_lock_count;
}
if (!_create_sanlock_lv(cmd, vg, LOCKD_SANLOCK_LV_NAME, num_mb)) {
log_error("Failed to create internal lv.");
return 0;
}
/*
* N.B. this passes the sanlock lv name as vg_lock_args
* even though it is only part of the final args string
* which will be returned from lvmlockd.
*/
reply = _lockd_send("init_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", "sanlock",
"vg_lock_args = %s", vg->sanlock_lv->name,
"opts = %s", opts ?: "none",
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
result = -ELOCKD;
} else {
ret = (result < 0) ? 0 : 1;
}
switch (result) {
case 0:
break;
case -ELOCKD:
log_error("VG %s init failed: lvmlockd not available", vg->name);
break;
case -EARGS:
log_error("VG %s init failed: invalid parameters for sanlock", vg->name);
break;
case -EDEVOPEN:
log_error("VG %s init failed: sanlock cannot open device /dev/mapper/%s-%s", vg->name, vg->name, LOCKD_SANLOCK_LV_NAME);
log_error("Check that sanlock has permission to access disks.");
break;
case -EMANAGER:
log_error("VG %s init failed: lock manager sanlock is not running", vg->name);
break;
case -EPROTONOSUPPORT:
log_error("VG %s init failed: lock manager sanlock is not supported by lvmlockd", vg->name);
break;
case -EMSGSIZE:
log_error("VG %s init failed: no disk space for leases", vg->name);
break;
case -EEXIST:
log_error("VG %s init failed: a lockspace with the same name exists", vg->name);
break;
default:
log_error("VG %s init failed: %d", vg->name, result);
}
if (!ret)
goto out;
if (!(reply_str = daemon_reply_str(reply, "vg_lock_args", NULL))) {
log_error("VG %s init failed: lock_args not returned", vg->name);
ret = 0;
goto out;
}
if (!(vg_lock_args = dm_pool_strdup(cmd->mem, reply_str))) {
log_error("VG %s init failed: lock_args alloc failed", vg->name);
ret = 0;
goto out;
}
lv_set_hidden(vg->sanlock_lv);
vg->sanlock_lv->status |= LOCKD_SANLOCK_LV;
vg->lock_type = "sanlock";
vg->lock_args = vg_lock_args;
if (!vg_write(vg) || !vg_commit(vg)) {
log_error("VG %s init failed: vg_write vg_commit", vg->name);
ret = 0;
goto out;
}
ret = 1;
out:
if (!ret) {
/*
* The usleep delay gives sanlock time to close the lock lv,
* and usually avoids having an annoying error printed.
*/
usleep(1000000);
_deactivate_sanlock_lv(cmd, vg);
_remove_sanlock_lv(cmd, vg);
if (!vg_write(vg) || !vg_commit(vg))
stack;
}
daemon_reply_destroy(reply);
return ret;
}
/* called after vg_remove on disk */
static int _free_vg_dlm(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
uint32_t lockd_flags = 0;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
reply = _lockd_send("free_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
NULL);
if (!_lockd_result(reply, &result, &lockd_flags)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (!ret)
log_error("_free_vg_dlm lvmlockd result %d", result);
daemon_reply_destroy(reply);
return 1;
}
/* called before vg_remove on disk */
static int _busy_vg_dlm(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
uint32_t lockd_flags = 0;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
/*
* Check that other hosts do not have the VG lockspace started.
*/
reply = _lockd_send("busy_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
NULL);
if (!_lockd_result(reply, &result, &lockd_flags)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (result == -EBUSY) {
log_error("Lockspace for \"%s\" not stopped on other hosts", vg->name);
goto out;
}
if (!ret)
log_error("_busy_vg_dlm lvmlockd result %d", result);
out:
daemon_reply_destroy(reply);
return ret;
}
/* called before vg_remove on disk */
static int _free_vg_sanlock(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
uint32_t lockd_flags = 0;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
/*
* vgremove originally held the global lock, but lost it because the
* vgremove command is removing multiple VGs, and removed the VG
* holding the global lock before attempting to remove this VG.
* To avoid this situation, the user should remove the VG holding
* the global lock in a command by itself, or as the last arg in a
* vgremove command that removes multiple VGs.
*/
if (cmd->lockd_gl_removed) {
log_error("Global lock failed: global lock was lost by removing a previous VG.");
return 0;
}
if (!vg->lock_args || !strlen(vg->lock_args)) {
/* Shouldn't happen in general, but maybe in some error cases? */
log_debug("_free_vg_sanlock %s no lock_args", vg->name);
return 1;
}
reply = _lockd_send("free_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
NULL);
if (!_lockd_result(reply, &result, &lockd_flags)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
/*
* Other hosts could still be joined to the lockspace, which means they
* are using the internal sanlock LV, which means we cannot remove the
* VG. Once other hosts stop using the VG it can be removed.
*/
if (result == -EBUSY) {
log_error("Lockspace for \"%s\" not stopped on other hosts", vg->name);
goto out;
}
if (!ret) {
log_error("_free_vg_sanlock lvmlockd result %d", result);
goto out;
}
/*
* If the global lock was been removed by removing this VG, then:
*
* Print a warning indicating that the global lock should be enabled
* in another remaining sanlock VG.
*
* Do not allow any more VGs to be removed by this command, e.g.
* if a command removes two sanlock VGs, like vgremove foo bar,
* and the global lock existed in foo, do not continue to remove
* VG bar without the global lock. See the corresponding check above.
*/
if (lockd_flags & LD_RF_WARN_GL_REMOVED) {
log_warn("VG %s held the sanlock global lock, enable global lock in another VG.", vg->name);
cmd->lockd_gl_removed = 1;
}
/*
* The usleep delay gives sanlock time to close the lock lv,
* and usually avoids having an annoying error printed.
*/
usleep(1000000);
_deactivate_sanlock_lv(cmd, vg);
_remove_sanlock_lv(cmd, vg);
out:
daemon_reply_destroy(reply);
return ret;
}
/* vgcreate */
int lockd_init_vg(struct cmd_context *cmd, struct volume_group *vg,
const char *lock_type, int lv_lock_count)
{
switch (get_lock_type_from_string(lock_type)) {
case LOCK_TYPE_NONE:
return 1;
case LOCK_TYPE_CLVM:
return 1;
case LOCK_TYPE_DLM:
return _init_vg_dlm(cmd, vg);
case LOCK_TYPE_SANLOCK:
return _init_vg_sanlock(cmd, vg, lv_lock_count);
default:
log_error("Unknown lock_type.");
return 0;
}
}
static int _lockd_all_lvs(struct cmd_context *cmd, struct volume_group *vg)
{
struct lv_list *lvl;
dm_list_iterate_items(lvl, &vg->lvs) {
if (!lockd_lv_uses_lock(lvl->lv))
continue;
if (!lockd_lv(cmd, lvl->lv, "ex", 0)) {
log_error("LV %s/%s must be inactive on all hosts.",
vg->name, lvl->lv->name);
return 0;
}
if (!lockd_lv(cmd, lvl->lv, "un", 0)) {
log_error("Failed to unlock LV %s/%s.", vg->name, lvl->lv->name);
return 0;
}
}
return 1;
}
/* vgremove before the vg is removed */
int lockd_free_vg_before(struct cmd_context *cmd, struct volume_group *vg,
int changing)
{
int lock_type_num = get_lock_type_from_string(vg->lock_type);
/*
* Check that no LVs are active on other hosts.
* When removing (not changing), each LV is locked
* when it is removed, they do not need checking here.
*/
if (lock_type_num == LOCK_TYPE_DLM || lock_type_num == LOCK_TYPE_SANLOCK) {
if (changing && !_lockd_all_lvs(cmd, vg)) {
log_error("Cannot change VG %s with active LVs", vg->name);
return 0;
}
}
switch (lock_type_num) {
case LOCK_TYPE_NONE:
/*
* If a sanlock VG was forcibly changed to none,
* the sanlock_lv may have been left behind.
*/
if (vg->sanlock_lv)
_remove_sanlock_lv(cmd, vg);
return 1;
case LOCK_TYPE_CLVM:
return 1;
case LOCK_TYPE_DLM:
/* returning an error will prevent vg_remove() */
return _busy_vg_dlm(cmd, vg);
case LOCK_TYPE_SANLOCK:
/* returning an error will prevent vg_remove() */
return _free_vg_sanlock(cmd, vg);
default:
log_error("Unknown lock_type.");
return 0;
}
}
/* vgremove after the vg is removed */
void lockd_free_vg_final(struct cmd_context *cmd, struct volume_group *vg)
{
switch (get_lock_type_from_string(vg->lock_type)) {
case LOCK_TYPE_NONE:
case LOCK_TYPE_CLVM:
case LOCK_TYPE_SANLOCK:
break;
case LOCK_TYPE_DLM:
_free_vg_dlm(cmd, vg);
break;
default:
log_error("Unknown lock_type.");
}
}
/*
* Starting a vg involves:
* 1. reading the vg without a lock
* 2. getting the lock_type/lock_args from the vg metadata
* 3. doing start_vg in lvmlockd for the lock_type;
* this means joining the lockspace
*
* The vg read in step 1 should not be used for anything
* other than getting the lock_type/lock_args/uuid necessary
* for starting the lockspace. To use the vg after starting
* the lockspace, follow the standard method which is:
* lock the vg, read/use/write the vg, unlock the vg.
*
* start_init is 1 when the VG is being started after the
* command has done lockd_init_vg(). This tells lvmlockd
* that the VG lockspace being started is new.
*/
int lockd_start_vg(struct cmd_context *cmd, struct volume_group *vg, int start_init, int *exists)
{
char uuid[64] __attribute__((aligned(8)));
daemon_reply reply;
uint32_t lockd_flags = 0;
int host_id = 0;
int result;
int ret;
memset(uuid, 0, sizeof(uuid));
if (!vg_is_shared(vg))
return 1;
if (!_use_lvmlockd) {
log_error("VG %s start failed: lvmlockd is not enabled", vg->name);
return 0;
}
if (!_lvmlockd_connected) {
log_error("VG %s start failed: lvmlockd is not running", vg->name);
return 0;
}
log_debug("lockd start VG %s lock_type %s init %d",
vg->name, vg->lock_type ? vg->lock_type : "empty", start_init);
if (!id_write_format(&vg->id, uuid, sizeof(uuid)))
return_0;
if (vg->lock_type && !strcmp(vg->lock_type, "sanlock")) {
/*
* This is the big difference between starting
* sanlock vgs vs starting dlm vgs: the internal
* sanlock lv needs to be activated before lvmlockd
* does the start because sanlock needs to use the lv
* to access locks.
*/
if (!_activate_sanlock_lv(cmd, vg))
return 0;
host_id = find_config_tree_int(cmd, local_host_id_CFG, NULL);
}
reply = _lockd_send("start_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args ?: "none",
"vg_uuid = %s", uuid[0] ? uuid : "none",
"version = " FMTd64, (int64_t) vg->seqno,
"host_id = " FMTd64, (int64_t) host_id,
"opts = %s", start_init ? "start_init" : "none",
NULL);
if (!_lockd_result(reply, &result, &lockd_flags)) {
ret = 0;
result = -ELOCKD;
} else {
ret = (result < 0) ? 0 : 1;
}
if (lockd_flags & LD_RF_WARN_GL_REMOVED)
cmd->lockd_gl_removed = 1;
switch (result) {
case 0:
log_print_unless_silent("VG %s starting %s lockspace", vg->name, vg->lock_type);
break;
case -ELOCKD:
log_error("VG %s start failed: lvmlockd not available", vg->name);
break;
case -EEXIST:
log_debug("VG %s start error: already started", vg->name);
ret = 1;
break;
case -ESTARTING:
log_debug("VG %s start error: already starting", vg->name);
if (exists)
*exists = 1;
ret = 1;
break;
case -EARGS:
log_error("VG %s start failed: invalid parameters for %s", vg->name, vg->lock_type);
break;
case -EHOSTID:
log_error("VG %s start failed: invalid sanlock host_id, set in lvmlocal.conf", vg->name);
break;
case -EMANAGER:
log_error("VG %s start failed: lock manager %s is not running", vg->name, vg->lock_type);
break;
case -EPROTONOSUPPORT:
log_error("VG %s start failed: lock manager %s is not supported by lvmlockd", vg->name, vg->lock_type);
break;
default:
log_error("VG %s start failed: %d", vg->name, result);
}
daemon_reply_destroy(reply);
return ret;
}
int lockd_stop_vg(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
int result;
int ret;
if (!vg_is_shared(vg))
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
log_debug("lockd stop VG %s lock_type %s",
vg->name, vg->lock_type ? vg->lock_type : "empty");
reply = _lockd_send("stop_vg",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (result == -ENOLS) {
ret = 1;
goto out;
}
if (result == -EBUSY) {
log_error("VG %s stop failed: LVs must first be deactivated", vg->name);
goto out;
}
if (!ret) {
log_error("VG %s stop failed: %d", vg->name, result);
goto out;
}
if (!strcmp(vg->lock_type, "sanlock")) {
log_debug("lockd_stop_vg deactivate sanlock lv");
_deactivate_sanlock_lv(cmd, vg);
}
out:
daemon_reply_destroy(reply);
return ret;
}
int lockd_start_wait(struct cmd_context *cmd)
{
daemon_reply reply;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
reply = _lockd_send("start_wait",
"pid = " FMTd64, (int64_t) getpid(),
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (!ret)
log_error("Lock start failed");
/*
* FIXME: get a list of vgs that started so we can
* better report what worked and what didn't?
*/
daemon_reply_destroy(reply);
if (cmd->lockd_gl_removed) {
log_error("Missing global lock: global lock was lost by removing a previous VG.");
log_error("To enable the global lock in another VG, see lvmlockctl --gl-enable.");
}
return ret;
}
/*
* lockd_gl_create() is a variation of lockd_gl() used only by vgcreate.
* It handles the case that when using sanlock, the global lock does
* not exist until after the first vgcreate is complete, since the global
* lock exists on storage within an actual VG. So, the first vgcreate
* needs special logic to detect this bootstrap case.
*
* When the vgcreate is not creating the first VG, then lockd_gl_create()
* behaves the same as lockd_gl().
*
* vgcreate will have a lock_type for the new VG which lockd_gl_create()
* can provide in the lock-gl call.
*
* lockd_gl() and lockd_gl_create() differ in the specific cases where
* ENOLS (no lockspace found) is overriden. In the vgcreate case, the
* override cases are related to sanlock bootstrap, and the lock_type of
* the vg being created is needed.
*
* 1. vgcreate of the first lockd-type vg calls lockd_gl_create()
* to acquire the global lock.
*
* 2. vgcreate/lockd_gl_create passes gl lock request to lvmlockd,
* along with lock_type of the new vg.
*
* 3. lvmlockd finds no global lockspace/lock.
*
* 4. dlm:
* If the lock_type from vgcreate is dlm, lvmlockd creates the
* dlm global lockspace, and queues the global lock request
* for vgcreate. lockd_gl_create returns sucess with the gl held.
*
* sanlock:
* If the lock_type from vgcreate is sanlock, lvmlockd returns -ENOLS
* with the NO_GL_LS flag. lvmlockd cannot create or acquire a sanlock
* global lock until the VG exists on disk (the locks live within the VG).
*
* lockd_gl_create sees sanlock/ENOLS/NO_GL_LS (and optionally the
* "enable" lock-gl arg), determines that this is the sanlock
* bootstrap special case, and returns success without the global lock.
*
* vgcreate creates the VG on disk, and calls lockd_init_vg() which
* initializes/enables a global lock on the new VG's internal sanlock lv.
* Future lockd_gl/lockd_gl_create calls will acquire the existing gl.
*/
int lockd_global_create(struct cmd_context *cmd, const char *def_mode, const char *vg_lock_type)
{
const char *mode = NULL;
uint32_t lockd_flags;
int retries = 0;
int result;
/*
* There are four variations of creating a local/lockd VG
* with/without use_lvmlockd set.
*
* use_lvmlockd=1, lockd VG:
* This function should acquire or create the global lock.
*
* use_lvmlockd=0, local VG:
* This function is a no-op, just returns 1.
*
* use_lvmlockd=0, lockd VG
* An error is returned in vgcreate_params_set_from_args (before this is called).
*
* use_lvmlockd=1, local VG
* This function should acquire the global lock.
*/
if (!_use_lvmlockd) {
if (!is_lockd_type(vg_lock_type))
return 1;
log_error("Cannot create VG with lock_type %s without lvmlockd.", vg_lock_type);
return 0;
}
log_debug("lockd global lock_type %s", vg_lock_type);
if (!mode)
mode = def_mode;
if (!mode) {
log_error("Unknown lock-gl mode");
return 0;
}
req:
if (!_lockd_request(cmd, "lock_gl",
NULL, vg_lock_type, NULL, NULL, NULL, NULL, mode, NULL,
&result, &lockd_flags)) {
/* No result from lvmlockd, it is probably not running. */
log_error("Global lock failed: check that lvmlockd is running.");
return 0;
}
if (result == -EAGAIN) {
if (retries < find_config_tree_int(cmd, global_lvmlockd_lock_retries_CFG, NULL)) {
log_warn("Retrying %s global lock", mode);
sleep(1);
retries++;
goto req;
}
}
/*
* ENOLS: no lockspace was found with a global lock.
* It may not exist (perhaps this command is creating the first),
* or it may not be visible or started on the system yet.
*/
if (result == -ENOLS) {
if (!strcmp(mode, "un"))
return 1;
/*
* This is the sanlock bootstrap condition for proceding
* without the global lock: a chicken/egg case for the first
* sanlock VG that is created. When creating the first
* sanlock VG, there is no global lock to acquire because
* the gl will exist in the VG being created. So, we
* skip acquiring the global lock when creating this initial
* VG, and enable the global lock in this VG.
*
* This initial bootstrap condition is identified based on
* two things:
*
* 1. No sanlock VGs have been started in lvmlockd, causing
* lvmlockd to return NO_GL_LS/NO_LOCKSPACES.
*
* 2. No sanlock VGs are seen in lvmcache after the disk
* scan performed.
*
* If both of those are true, we go ahead and create this new
* VG which will have the global lock enabled. However, this
* has a shortcoming: another sanlock VG may exist that hasn't
* appeared to the system yet. If that VG has its global lock
* enabled, then when it appears later, duplicate global locks
* will be seen, and a warning will indicate that one of them
* should be disabled.
*
* The two bootstrap conditions have another shortcoming to the
* opposite effect: other sanlock VGs may be visible to the
* system, but none of them have a global lock enabled.
* In that case, it would make sense to create this new VG with
* an enabled global lock. (FIXME: we could detect that none
* of the existing sanlock VGs have a gl enabled and allow this
* vgcreate to go ahead.) Enabling the global lock in one of
* the existing sanlock VGs is currently the simplest solution.
*/
if ((lockd_flags & LD_RF_NO_GL_LS) &&
(lockd_flags & LD_RF_NO_LOCKSPACES) &&
!strcmp(vg_lock_type, "sanlock")) {
if (lvmcache_contains_lock_type_sanlock(cmd)) {
/* FIXME: we could check that all are started, and then check that none have gl enabled. */
log_error("Global lock failed: start existing sanlock VGs to access global lock.");
log_error("(If all sanlock VGs are started, enable global lock with lvmlockctl.)");
return 0;
}
log_print_unless_silent("Enabling sanlock global lock");
return 1;
}
if (!strcmp(vg_lock_type, "sanlock"))
log_error("Global lock failed: check that VG holding global lock exists and is started.");
else
log_error("Global lock failed: check that global lockspace is started.");
if (lockd_flags & LD_RF_NO_LM)
log_error("Start a lock manager, lvmlockd did not find one running.");
return 0;
}
/*
* Check for each specific error that can be returned so a helpful
* message can be printed for it.
*/
if (result < 0) {
if (result == -ESTARTING)
log_error("Global lock failed: lockspace is starting.");
else if (result == -EAGAIN)
log_error("Global lock failed: held by other host.");
else if (result == -EPROTONOSUPPORT)
log_error("VG create failed: lock manager %s is not supported by lvmlockd.", vg_lock_type);
else
log_error("Global lock failed: error %d", result);
return 0;
}
/* --shared with vgcreate does not mean include_shared_vgs */
cmd->include_shared_vgs = 0;
/*
* This is done to prevent converting an explicitly acquired
* ex lock to sh in process_each.
*/
cmd->lockd_global_ex = 1;
return 1;
}
/*
* The global lock protects:
*
* - The global VG namespace. Two VGs cannot have the same name.
* Used by any command that creates or removes a VG name,
* e.g. vgcreate, vgremove, vgrename, vgsplit, vgmerge.
*
* - The set of orphan PVs.
* Used by any command that changes a non-PV device into an orphan PV,
* an orphan PV into a device, a non-orphan PV (in a VG) into an orphan PV
* (not in a VG), or an orphan PV into a non-orphan PV,
* e.g. pvcreate, pvremove, vgcreate, vgremove, vgextend, vgreduce.
*
* - The properties of orphan PVs. It is possible to make changes to the
* properties of an orphan PV, e.g. pvresize, pvchange.
*
* These are things that cannot be protected by a VG lock alone, since
* orphan PVs do not belong to a real VG (an artificial VG does not
* apply since a sanlock lock only exists on real storage.)
*
* If a command will change any of the things above, it must first acquire
* the global lock in exclusive mode.
*
* If command is reading any of the things above, it must acquire the global
* lock in shared mode. A number of commands read the things above, including:
*
* - Reporting/display commands which show all VGs. Any command that
* will iterate through the entire VG namespace must first acquire the
* global lock shared so that it has an accurate view of the namespace.
*
* - A command where a tag name is used to identify what to process.
* A tag requires reading all VGs to check if they match the tag.
*
* In these cases, the global lock must be acquired before the list of
* all VGs is created.
*
* The global lock is not generally unlocked explicitly in the code.
* When the command disconnects from lvmlockd, lvmlockd automatically
* releases the locks held by the command. The exception is if a command
* will continue running for a long time while not needing the global lock,
* e.g. commands that poll to report progress.
*
* There are two cases where the global lock can be taken in shared mode,
* and then later converted to ex. pvchange and pvresize use process_each_pv
* which does lockd_gl("sh") to get the list of VGs. Later, in the "_single"
* function called within process_each_pv, the PV may be an orphan, in which
* case the ex global lock is needed, so it's converted to ex at that point.
*
* Effects of misconfiguring use_lvmlockd.
*
* - Setting use_lvmlockd=1 tells lvm commands to use the global lock.
* This should not be set unless a lock manager and lockd VGs will
* be used. Setting use_lvmlockd=1 without setting up a lock manager
* or using lockd VGs will cause lvm commands to fail when they attempt
* to change any global state (requiring the ex global lock), and will
* cause warnings when the commands read global state (requiring the sh
* global lock). In this condition, lvm is nominally useful, and existing
* local VGs can continue to be used mostly as usual. But, the
* warnings/errors should lead a user to either set up a lock manager
* and lockd VGs, or set use_lvmlockd to 0.
*
* - Setting use_lvmlockd=0 tells lvm commands to not use the global lock.
* If use_lvmlockd=0 when lockd VGs exist which require lvmlockd, the
* lockd_gl() calls become no-ops, but the lockd_vg() calls for the lockd
* VGs will fail. The warnings/errors from accessing the lockd VGs
* should lead the user to set use_lvmlockd to 1 and run the necessary
* lock manager. In this condition, lvm reverts to the behavior of
* the following case, in which system ID largely protects shared
* devices, but has limitations.
*
* - Setting use_lvmlockd=0 with shared devices, no lockd VGs and
* no lock manager is a recognized mode of operation that is
* described in the lvmsystemid man page. Using lvm on shared
* devices this way is made safe by using system IDs to assign
* ownership of VGs to single hosts. The main limitation of this
* mode (among others outlined in the man page), is that orphan PVs
* are unprotected.
*/
int lockd_global(struct cmd_context *cmd, const char *def_mode)
{
const char *mode = NULL;
const char *opts = NULL;
uint32_t lockd_flags;
int retries = 0;
int result;
if (!_use_lvmlockd)
return 1;
/*
* Verify that when --readonly is used, no ex locks should be used.
*/
if (cmd->metadata_read_only && def_mode && !strcmp(def_mode, "ex")) {
log_error("Exclusive locks are not allowed with readonly option.");
return 0;
}
if (cmd->lockd_gl_disable)
return 1;
if (def_mode && !strcmp(def_mode, "un")) {
mode = "un";
goto req;
}
if (!mode)
mode = def_mode;
if (!mode) {
log_error("Unknown lvmlockd global lock mode");
return 0;
}
if (!strcmp(mode, "sh") && cmd->lockd_global_ex)
return 1;
if (!strcmp(mode, "un") && cmd->lockd_global_ex)
cmd->lockd_global_ex = 0;
req:
log_debug("lockd global mode %s", mode);
if (!_lockd_request(cmd, "lock_gl",
NULL, NULL, NULL, NULL, NULL, NULL, mode, opts,
&result, &lockd_flags)) {
/* No result from lvmlockd, it is probably not running. */
/* We don't care if an unlock fails. */
if (!strcmp(mode, "un"))
return 1;
/* We can continue reading if a shared lock fails. */
if (!strcmp(mode, "sh")) {
log_warn("Reading without shared global lock.");
goto allow;
}
log_error("Global lock failed: check that lvmlockd is running.");
return 0;
}
if (result == -EAGAIN) {
if (retries < find_config_tree_int(cmd, global_lvmlockd_lock_retries_CFG, NULL)) {
log_warn("Retrying %s global lock", mode);
sleep(1);
retries++;
goto req;
}
}
if (result == -EALREADY) {
/*
* This should generally not happen because commands should be coded
* to avoid reacquiring the global lock. If there is a case that's
* missed which causes the command to request the gl when it's already
* held, it's not a problem, so let it go.
*/
log_debug("lockd global mode %s already held.", mode);
return 1;
}
if (!strcmp(mode, "un"))
return 1;
/*
* ENOLS: no lockspace was found with a global lock.
* The VG with the global lock may not be visible or started yet,
* this should be a temporary condition.
*
* ESTARTING: the lockspace with the gl is starting.
* The VG with the global lock is starting and should finish shortly.
*
* ELOCKIO: sanlock gets i/o errors when trying to read/write leases
* (This can progress to EVGKILLED.)
*
* EVGKILLED: the sanlock lockspace is being killed after losing
* access to lease storage.
*/
if (result == -ENOLS && (lockd_flags & LD_RF_NO_LM))
log_error("Start a lock manager, lvmlockd did not find one running.");
if (result == -ENOLS ||
result == -ESTARTING ||
result == -EVGKILLED ||
result == -ELOCKIO) {
/*
* If an ex global lock fails, then the command fails.
*/
if (strcmp(mode, "sh")) {
if (result == -ESTARTING)
log_error("Global lock failed: lockspace is starting");
else if (result == -ENOLS)
log_error("Global lock failed: check that global lockspace is started");
else if (result == -ELOCKIO)
log_error("Global lock failed: storage errors for sanlock leases");
else if (result == -EVGKILLED)
log_error("Global lock failed: storage failed for sanlock leases");
else
log_error("Global lock failed: error %d", result);
return 0;
}
/*
* If a sh global lock fails, then the command can continue
* reading without it, but force a global cache validation,
* and print a warning.
*/
if (result == -ESTARTING) {
log_warn("Skipping global lock: lockspace is starting");
goto allow;
}
if (result == -ELOCKIO || result == -EVGKILLED) {
log_warn("Skipping global lock: storage %s for sanlock leases",
result == -ELOCKIO ? "errors" : "failed");
goto allow;
}
if ((lockd_flags & LD_RF_NO_GL_LS) && (lockd_flags & LD_RF_WARN_GL_REMOVED)) {
log_warn("Skipping global lock: VG with global lock was removed");
goto allow;
}
if ((lockd_flags & LD_RF_NO_GL_LS) || (lockd_flags & LD_RF_NO_LOCKSPACES)) {
log_warn("Skipping global lock: lockspace not found or started");
goto allow;
}
/*
* This is for completeness. If we reach here, then
* a specific check for the error should be added above
* with a more helpful message.
*/
log_error("Global lock failed: error %d", result);
return 0;
}
if ((lockd_flags & LD_RF_DUP_GL_LS) && strcmp(mode, "un"))
log_warn("Duplicate sanlock global locks should be corrected");
if (result < 0) {
if (result == -EAGAIN) {
/*
* Most of the time, retries should avoid this case.
*/
log_error("Global lock failed: held by other host.");
return 0;
} else {
/*
* We don't intend to reach this. We should check
* any known/possible error specifically and print
* a more helpful message. This is for completeness.
*/
log_error("Global lock failed: error %d.", result);
return 0;
}
}
allow:
/*
* This is done to prevent converting an explicitly acquired
* ex lock to sh in process_each.
*/
if (!strcmp(mode, "ex"))
cmd->lockd_global_ex = 1;
return 1;
}
/*
* VG lock
*
* Return 1: continue, lockd_state may still indicate an error
* Return 0: failure, do not continue
*
* lvmlockd could also return the lock_type that it used for the VG,
* and we could encode that in lockd_state, and verify later that it
* matches vg->lock_type.
*
* The result of the VG lock operation needs to be saved in lockd_state
* because the result needs to be passed into vg_read so it can be
* assessed in combination with vg->lock_type.
*
* The VG lock protects the VG metadata on disk from concurrent access
* among hosts.
*
* The VG lock must be acquired before the VG is read, i.e. before vg_read().
* The result from lockd_vg() is saved in the "lockd_state" variable, and
* this result is passed into vg_read(). After vg_read() reads the VG,
* it checks if the VG lock_type (sanlock or dlm) requires a lock to be
* held, and if so, it verifies that the lock was correctly acquired by
* looking at lockd_state. If vg_read() sees that the VG is a local VG,
* i.e. lock_type is not sanlock or dlm, then no lock is required, and it
* ignores lockd_state (which would indicate no lock was found.)
*/
int lockd_vg(struct cmd_context *cmd, const char *vg_name, const char *def_mode,
uint32_t flags, uint32_t *lockd_state)
{
const char *mode = NULL;
uint32_t lockd_flags;
uint32_t prev_state = *lockd_state;
int retries = 0;
int result;
int ret;
/*
* The result of the VG lock request is saved in lockd_state to be
* passed into vg_read where the lock result is needed once we
* know if this is a local VG or lockd VG.
*/
*lockd_state = 0;
if (!is_real_vg(vg_name))
return 1;
/*
* Verify that when --readonly is used, no ex locks should be used.
*/
if (cmd->metadata_read_only &&
((def_mode && !strcmp(def_mode, "ex")) ||
(!def_mode && !cmd->lockd_vg_default_sh))) {
log_error("Exclusive locks are not allowed with readonly option.");
return 0;
}
/*
* Some special cases need to disable the vg lock.
*/
if (cmd->lockd_vg_disable)
return 1;
/*
* An unlock is simply sent or skipped without any need
* for the mode checking for sh/ex.
*
* Look at lockd_state from the sh/ex lock, and if it failed,
* don't bother sending the unlock to lvmlockd. The main
* purpose of this is to avoid sending an unnecessary unlock
* for local VGs (the lockd_state from sh/ex on the local VG
* will be failed.) This implies that the lockd_state value
* should be preserved from the sh/ex lockd_vg() call and
* passed back to lockd_vg() for the corresponding unlock.
*/
if (def_mode && !strcmp(def_mode, "un")) {
if (prev_state & LDST_FAIL)
return 1;
mode = "un";
goto req;
}
/*
* The default mode may not have been provided in the
* function args. This happens when lockd_vg is called
* from a process_each function that handles different
* commands. Commands that only read/check/report/display
* the vg have LOCKD_VG_SH set in commands.h, which is
* copied to lockd_vg_default_sh. Commands without this
* set modify the vg and need ex.
*/
if (!mode)
mode = def_mode;
if (!mode)
mode = cmd->lockd_vg_default_sh ? "sh" : "ex";
if (!strcmp(mode, "ex"))
*lockd_state |= LDST_EX;
req:
/*
* This check is not at the top of the function so that
* we can first set LDST_EX which will be used later to
* decide whether a failure can be ignored or not.
*
* We do not know if this is a local VG or lockd VG yet,
* so we must return success, go ahead and read the VG,
* then check if the lock_type required lvmlockd or not.
*/
if (!_use_lvmlockd) {
*lockd_state |= LDST_FAIL_REQUEST;
return 1;
}
log_debug("lockd VG %s mode %s", vg_name, mode);
if (!_lockd_request(cmd, "lock_vg",
vg_name, NULL, NULL, NULL, NULL, NULL, mode, NULL,
&result, &lockd_flags)) {
/*
* No result from lvmlockd, it is probably not running.
* Decide if it is ok to continue without a lock in
* access_vg_lock_type() after the VG has been read and
* the lock_type can be checked. We don't care about
* this error for local VGs, but we do care for lockd VGs.
*/
*lockd_state |= LDST_FAIL_REQUEST;
return 1;
}
if (result == -EAGAIN) {
if (retries < find_config_tree_int(cmd, global_lvmlockd_lock_retries_CFG, NULL)) {
log_warn("Retrying %s lock on VG %s", mode, vg_name);
sleep(1);
retries++;
goto req;
}
}
switch (result) {
case 0:
/* success */
break;
case -ENOLS:
*lockd_state |= LDST_FAIL_NOLS;
break;
case -ESTARTING:
*lockd_state |= LDST_FAIL_STARTING;
break;
default:
*lockd_state |= LDST_FAIL_OTHER;
}
/*
* Normal success.
*/
if (!result) {
ret = 1;
goto out;
}
/*
* The VG has been removed. This will only happen with a dlm VG
* since a sanlock VG must be stopped everywhere before it's removed.
*/
if (result == -EREMOVED) {
log_error("VG %s lock failed: removed", vg_name);
ret = 1;
goto out;
}
/*
* The lockspace for the VG is starting (the VG must not
* be local), and is not yet ready to do locking. Allow
* reading without a sh lock during this period.
*/
if (result == -ESTARTING) {
if (!strcmp(mode, "un")) {
ret = 1;
goto out;
} else if (!strcmp(mode, "sh")) {
log_warn("VG %s lock skipped: lock start in progress", vg_name);
ret = 1;
goto out;
} else {
log_error("VG %s lock failed: lock start in progress", vg_name);
ret = 0;
goto out;
}
}
/*
* sanlock is getting i/o errors while reading/writing leases, or the
* lockspace/VG is being killed after failing to renew its lease for
* too long.
*/
if (result == -EVGKILLED || result == -ELOCKIO) {
const char *problem = (result == -ELOCKIO ? "errors" : "failed");
if (!strcmp(mode, "un")) {
ret = 1;
goto out;
} else if (!strcmp(mode, "sh")) {
log_warn("VG %s lock skipped: storage %s for sanlock leases", vg_name, problem);
ret = 1;
goto out;
} else {
log_error("VG %s lock failed: storage %s for sanlock leases", vg_name, problem);
ret = 0;
goto out;
}
}
/*
* The lock is held by another host, and retries have been unsuccessful.
*/
if (result == -EAGAIN) {
if (!strcmp(mode, "un")) {
ret = 1;
goto out;
} else if (!strcmp(mode, "sh")) {
log_warn("VG %s lock skipped: held by other host.", vg_name);
ret = 1;
goto out;
} else {
log_error("VG %s lock failed: held by other host.", vg_name);
ret = 0;
goto out;
}
}
/*
* No lockspace for the VG was found. It may be a local
* VG that lvmlockd doesn't keep track of, or it may be
* a lockd VG that lvmlockd doesn't yet know about (it hasn't
* been started yet.) Decide what to do after the VG is
* read and we can see the lock_type.
*/
if (result == -ENOLS) {
ret = 1;
goto out;
}
/*
* Another error. We don't intend to reach here, but
* want to check for each specific error above so that
* a helpful message can be printed.
*/
if (result) {
if (!strcmp(mode, "un")) {
ret = 1;
goto out;
} else if (!strcmp(mode, "sh")) {
log_warn("VG %s lock skipped: error %d", vg_name, result);
ret = 1;
goto out;
} else {
log_error("VG %s lock failed: error %d", vg_name, result);
ret = 0;
goto out;
}
}
out:
/*
* A notice from lvmlockd that duplicate gl locks have been found.
* It would be good for the user to disable one of them.
*/
if ((lockd_flags & LD_RF_DUP_GL_LS) && strcmp(mode, "un"))
log_warn("Duplicate sanlock global lock in VG %s", vg_name);
return ret;
}
/*
* This must be called before a new version of the VG metadata is
* written to disk. For local VGs, this is a no-op, but for lockd
* VGs, this notifies lvmlockd of the new VG seqno. lvmlockd must
* know the latest VG seqno so that it can save it within the lock's
* LVB. The VG seqno in the VG lock's LVB is used by other hosts to
* detect when their cached copy of the VG metadata is stale, i.e.
* the cached VG metadata has a lower seqno than the seqno seen in
* the VG lock.
*/
int lockd_vg_update(struct volume_group *vg)
{
daemon_reply reply;
int result;
int ret;
if (!vg_is_shared(vg))
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
reply = _lockd_send("vg_update",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"version = " FMTd64, (int64_t) vg->seqno,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
daemon_reply_destroy(reply);
return ret;
}
static int _query_lock_lv(struct cmd_context *cmd, struct volume_group *vg,
const char *lv_name, char *lv_uuid,
const char *lock_args, int *ex, int *sh)
{
daemon_reply reply;
const char *opts = NULL;
const char *reply_str;
int result;
int ret;
log_debug("lockd query LV %s/%s", vg->name, lv_name);
reply = _lockd_send("query_lock_lv",
"pid = " FMTd64, (int64_t) getpid(),
"opts = %s", opts ?: "none",
"vg_name = %s", vg->name,
"lv_name = %s", lv_name,
"lv_uuid = %s", lv_uuid,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
"lv_lock_args = %s", lock_args ?: "none",
NULL);
if (!_lockd_result(reply, &result, NULL)) {
/* No result from lvmlockd, it is probably not running. */
log_error("Lock query failed for LV %s/%s", vg->name, lv_name);
return 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (!ret)
log_error("query_lock_lv lvmlockd result %d", result);
if (!(reply_str = daemon_reply_str(reply, "mode", NULL))) {
log_error("query_lock_lv mode not returned");
ret = 0;
}
if (reply_str && !strcmp(reply_str, "ex"))
*ex = 1;
else if (reply_str && !strcmp(reply_str, "sh"))
*sh = 1;
daemon_reply_destroy(reply);
/* The lv was not active/locked. */
if (result == -ENOENT)
return 1;
return 1;
}
/*
* When this is called directly (as opposed to being called from
* lockd_lv), the caller knows that the LV has a lock.
*/
int lockd_lv_name(struct cmd_context *cmd, struct volume_group *vg,
const char *lv_name, struct id *lv_id,
const char *lock_args, const char *def_mode, uint32_t flags)
{
char lv_uuid[64] __attribute__((aligned(8)));
const char *mode = NULL;
const char *opts = NULL;
uint32_t lockd_flags;
int refreshed = 0;
int result;
/*
* Verify that when --readonly is used, no LVs should be activated or used.
*/
if (cmd->metadata_read_only) {
log_error("LV locks are not allowed with readonly option.");
return 0;
}
if (!id_write_format(lv_id, lv_uuid, sizeof(lv_uuid)))
return_0;
if (cmd->lockd_lv_disable && !strcmp(vg->lock_type, "dlm")) {
/*
* If the command is updating an LV with a shared lock,
* and using --lockopt skiplv to skip the incompat ex
* lock, then check if an existing sh lock exists.
*/
if (!strcmp(cmd->name, "lvextend") || !strcmp(cmd->name, "lvresize") ||
!strcmp(cmd->name, "lvchange") || !strcmp(cmd->name, "lvconvert")) {
int ex = 0, sh = 0;
if (!_query_lock_lv(cmd, vg, lv_name, lv_uuid, lock_args, &ex, &sh))
return 1;
if (sh) {
log_warn("WARNING: shared LV may require refresh on other hosts where it is active.");
return 1;
}
}
return 1;
}
if (cmd->lockd_lv_disable)
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
/*
* For lvchange/vgchange activation, def_mode is "sh" or "ex"
* according to the specific -a{e,s}y mode designation.
* No e,s designation gives NULL def_mode.
*/
if (def_mode)
mode = def_mode;
if (mode && !strcmp(mode, "sh") && (flags & LDLV_MODE_NO_SH)) {
struct logical_volume *lv = find_lv(vg, lv_name);
log_error("Shared activation not compatible with LV type %s of %s/%s",
lv ? lvseg_name(first_seg(lv)) : "", vg->name, lv_name);
return 0;
}
if (!mode)
mode = "ex";
if (flags & LDLV_PERSISTENT)
opts = "persistent";
retry:
log_debug("lockd LV %s/%s mode %s uuid %s", vg->name, lv_name, mode, lv_uuid);
if (!_lockd_request(cmd, "lock_lv",
vg->name, vg->lock_type, vg->lock_args,
lv_name, lv_uuid, lock_args, mode, opts,
&result, &lockd_flags)) {
/* No result from lvmlockd, it is probably not running. */
log_error("Locking failed for LV %s/%s", vg->name, lv_name);
return 0;
}
/* The lv was not active/locked. */
if (result == -ENOENT && !strcmp(mode, "un"))
return 1;
if (result == -EALREADY)
return 1;
if (result == -EAGAIN) {
log_error("LV locked by other host: %s/%s", vg->name, lv_name);
return 0;
}
if (result == -EEXIST) {
/*
* This happens if a command like lvchange tries to modify the
* LV with an ex LV lock when the LV is already active with a
* sh LV lock.
*/
if (lockd_flags & LD_RF_SH_EXISTS) {
if (flags & LDLV_SH_EXISTS_OK) {
log_warn("WARNING: extending LV with a shared lock, other hosts may require LV refresh.");
cmd->lockd_lv_sh_for_ex = 1;
return 1;
}
}
log_error("LV is already locked with incompatible mode: %s/%s", vg->name, lv_name);
return 0;
}
if (result == -EMSGSIZE) {
/* Another host probably extended lvmlock. */
if (!refreshed++) {
log_debug("Refresh lvmlock");
_refresh_sanlock_lv(cmd, vg);
goto retry;
}
}
if (result == -ENOLS) {
log_error("LV %s/%s lock failed: lockspace is inactive", vg->name, lv_name);
return 0;
}
if (result == -EVGKILLED || result == -ELOCKIO) {
const char *problem = (result == -ELOCKIO ? "errors" : "failed");
log_error("LV %s/%s lock failed: storage %s for sanlock leases", vg->name, lv_name, problem);
return 0;
}
if (result < 0) {
log_error("LV %s/%s lock failed: error %d", vg->name, lv_name, result);
return 0;
}
return 1;
}
/*
* Direct the lock request to the pool LV.
* For a thin pool and all its thin volumes, one ex lock is used.
* It is the one specified in metadata of the pool data lv.
*/
static int _lockd_lv_thin(struct cmd_context *cmd, struct logical_volume *lv,
const char *def_mode, uint32_t flags)
{
struct logical_volume *pool_lv = NULL;
if (lv_is_thin_volume(lv)) {
struct lv_segment *pool_seg = first_seg(lv);
pool_lv = pool_seg ? pool_seg->pool_lv : NULL;
} else if (lv_is_thin_pool(lv)) {
pool_lv = lv;
} else if (lv_is_thin_pool_data(lv)) {
/* FIXME: there should be a function to get pool lv from data lv. */
pool_lv = lv_parent(lv);
} else if (lv_is_thin_pool_metadata(lv)) {
struct lv_segment *pool_seg = get_only_segment_using_this_lv(lv);
if (pool_seg)
pool_lv = pool_seg->lv;
} else {
/* This should not happen AFAIK. */
log_error("Lock on incorrect thin lv type %s/%s",
lv->vg->name, lv->name);
return 0;
}
if (!pool_lv) {
/* This should not happen. */
log_error("Cannot find thin pool for %s/%s",
lv->vg->name, lv->name);
return 0;
}
/*
* Locking a locked lv (pool in this case) is a no-op.
* Unlock when the pool is no longer active.
*/
if (def_mode && !strcmp(def_mode, "un") && pool_is_active(pool_lv))
return 1;
flags |= LDLV_MODE_NO_SH;
return lockd_lv_name(cmd, pool_lv->vg, pool_lv->name, &pool_lv->lvid.id[1],
pool_lv->lock_args, def_mode, flags);
}
/*
* If the VG has no lock_type, then this function can return immediately.
* The LV itself may have no lock (NULL lv->lock_args), but the lock request
* may be directed to another lock, e.g. the pool LV lock in _lockd_lv_thin.
* If the lock request is not directed to another LV, and the LV has no
* lock_type set, it means that the LV has no lock, and no locking is done
* for it.
*
* An LV lock is acquired before the LV is activated, and released
* after the LV is deactivated. If the LV lock cannot be acquired,
* it means that the LV is active on another host and the activation
* fails. Commands that modify an inactive LV also acquire the LV lock.
*
* In non-lockd VGs, this is a no-op.
*
* In lockd VGs, normal LVs each have their own lock, but other
* LVs do not have their own lock, e.g. the lock for a thin LV is
* acquired on the thin pool LV, and a thin LV does not have a lock
* of its own. A cache pool LV does not have a lock of its own.
* When the cache pool LV is linked to an origin LV, the lock of
* the orgin LV protects the combined origin + cache pool.
*/
int lockd_lv(struct cmd_context *cmd, struct logical_volume *lv,
const char *def_mode, uint32_t flags)
{
if (!vg_is_shared(lv->vg))
return 1;
if (!_use_lvmlockd) {
log_error("LV in VG %s with lock_type %s requires lvmlockd.",
lv->vg->name, lv->vg->lock_type);
return 0;
}
if (!_lvmlockd_connected)
return 0;
if (lv_is_thin_type(lv))
return _lockd_lv_thin(cmd, lv, def_mode, flags);
/*
* An LV with NULL lock_args does not have a lock of its own.
*/
if (!lv->lock_args)
return 1;
/*
* A cachevol LV is one exception, where the LV keeps lock_args (so
* they do not need to be reallocated on split) but the lvmlockd lock
* is not used.
*/
if (lv_is_cache_vol(lv))
return 1;
/*
* LV type cannot be active concurrently on multiple hosts,
* so shared mode activation is not allowed.
*/
if (lv_is_external_origin(lv) ||
lv_is_thin_type(lv) ||
lv_is_mirror_type(lv) ||
lv_is_raid_type(lv) ||
lv_is_cache_type(lv)) {
flags |= LDLV_MODE_NO_SH;
}
return lockd_lv_name(cmd, lv->vg, lv->name, &lv->lvid.id[1],
lv->lock_args, def_mode, flags);
}
/*
* Check if the LV being resized is used by gfs2/ocfs2 which we
* know allow resizing under a shared lock.
*/
static int _shared_fs_can_resize(struct logical_volume *lv)
{
FILE *f = NULL;
struct mntent *m;
int ret = 0;
if (!(f = setmntent("/etc/mtab", "r")))
return 0;
while ((m = getmntent(f))) {
if (!strcmp(m->mnt_type, "gfs2") || !strcmp(m->mnt_type, "ocfs2")) {
/* FIXME: check if this mntent is for lv */
ret = 1;
break;
}
}
endmntent(f);
return ret;
}
/*
* A special lockd_lv function is used for lvresize so that details can
* be saved for doing cluster "refresh" at the end of the command.
*/
int lockd_lv_resize(struct cmd_context *cmd, struct logical_volume *lv,
const char *def_mode, uint32_t flags,
struct lvresize_params *lp)
{
char lv_uuid[64] __attribute__((aligned(8)));
char path[PATH_MAX];
int shupdate = (lp->lockopt && strstr(lp->lockopt, "shupdate"));
int norefresh = (lp->lockopt && strstr(lp->lockopt, "norefresh"));
int rv;
if (!vg_is_shared(lv->vg))
return 1;
if (!_use_lvmlockd) {
log_error("LV in VG %s with lock_type %s requires lvmlockd.",
lv->vg->name, lv->vg->lock_type);
return 0;
}
if (!_lvmlockd_connected)
return 0;
/*
* A special case for gfs2 where we want to allow lvextend
* of an LV that has an existing shared lock, which is normally
* incompatible with the ex lock required by lvextend.
*
* Check if gfs2 or ocfs2 is mounted on the LV, and enable this
* SH_EXISTS_OK flag if so. Other users of the LV may not want
* to allow this. --lockopt shupdate allows the shared lock in
* place of ex even we don't detect gfs2/ocfs2.
*/
if (lp->resize == LV_EXTEND) {
if (shupdate || _shared_fs_can_resize(lv))
flags |= LDLV_SH_EXISTS_OK;
}
rv = lockd_lv(cmd, lv, def_mode, flags);
if (norefresh)
return rv;
/*
* If lockd_lv found an existing sh lock in lvmlockd and
* used that in place of the usual ex lock (we allowed this
* with SH_EXISTS_OK), then it sets this flag.
*
* We use this as a signal that we should try to refresh
* the LV on remote nodes through dlm/corosync at the end
* of the command.
*
* If lockd_lv sucessfully acquired the LV lock ex (did not
* need to make use of SH_EXISTS_OK), then we know the LV
* is active here only (or not active anywhere) and we
* don't need to do any remote refresh.
*
* lvresize --lockopt norefresh disables the remote refresh.
*/
if (cmd->lockd_lv_sh_for_ex) {
if (!id_write_format(&lv->lvid.id[1], lv_uuid, sizeof(lv_uuid)))
return 0;
if (dm_snprintf(path, sizeof(path), "%s/%s/%s",
cmd->dev_dir, lv->vg->name, lv->name) < 0) {
log_error("LV path too long for lvmlockd refresh.");
return 0;
}
/* These will be used at the end of lvresize to do lockd_lv_refresh */
lp->lockd_lv_refresh_path = dm_pool_strdup(cmd->mem, path);
lp->lockd_lv_refresh_uuid = dm_pool_strdup(cmd->mem, lv_uuid);
}
return rv;
}
static int _init_lv_sanlock(struct cmd_context *cmd, struct volume_group *vg,
const char *lv_name, struct id *lv_id,
const char **lock_args_ret)
{
char lv_uuid[64] __attribute__((aligned(8)));
daemon_reply reply;
const char *reply_str;
const char *lv_lock_args = NULL;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
if (!id_write_format(lv_id, lv_uuid, sizeof(lv_uuid)))
return_0;
reply = _lockd_send("init_lv",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"lv_name = %s", lv_name,
"lv_uuid = %s", lv_uuid,
"vg_lock_type = %s", "sanlock",
"vg_lock_args = %s", vg->lock_args,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (result == -EEXIST) {
log_error("Lock already exists for LV %s/%s", vg->name, lv_name);
goto out;
}
if (result == -EMSGSIZE) {
/*
* No space on the lvmlock lv for a new lease, this should be
* detected by handle_sanlock_lv() called before.
*/
log_error("No sanlock space for lock for LV %s/%s", vg->name, lv_name);
goto out;
}
if (!ret) {
log_error("_init_lv_sanlock lvmlockd result %d", result);
goto out;
}
if (!(reply_str = daemon_reply_str(reply, "lv_lock_args", NULL))) {
log_error("lv_lock_args not returned");
ret = 0;
goto out;
}
if (!(lv_lock_args = dm_pool_strdup(cmd->mem, reply_str))) {
log_error("lv_lock_args allocation failed");
ret = 0;
}
out:
daemon_reply_destroy(reply);
*lock_args_ret = lv_lock_args;
return ret;
}
static int _free_lv(struct cmd_context *cmd, struct volume_group *vg,
const char *lv_name, struct id *lv_id, const char *lock_args)
{
char lv_uuid[64] __attribute__((aligned(8)));
daemon_reply reply;
int result;
int ret;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
if (!id_write_format(lv_id, lv_uuid, sizeof(lv_uuid)))
return_0;
reply = _lockd_send("free_lv",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"lv_name = %s", lv_name,
"lv_uuid = %s", lv_uuid,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
"lv_lock_args = %s", lock_args ?: "none",
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
if (!ret)
log_error("_free_lv lvmlockd result %d", result);
daemon_reply_destroy(reply);
return ret;
}
int lockd_init_lv_args(struct cmd_context *cmd, struct volume_group *vg,
struct logical_volume *lv,
const char *lock_type, const char **lock_args)
{
/* sanlock is the only lock type that sets per-LV lock_args. */
if (!strcmp(lock_type, "sanlock"))
return _init_lv_sanlock(cmd, vg, lv->name, &lv->lvid.id[1], lock_args);
return 1;
}
/*
* lvcreate
*
* An LV created in a lockd VG inherits the lock_type of the VG. In some
* cases, e.g. thin LVs, this function may decide that the LV should not be
* given a lock, in which case it sets lp lock_args to NULL, which will cause
* the LV to not have lock_args set in its metadata. A lockd_lv() request on
* an LV with no lock_args will do nothing (unless the LV type causes the lock
* request to be directed to another LV with a lock, e.g. to the thin pool LV
* for thin LVs.)
*/
int lockd_init_lv(struct cmd_context *cmd, struct volume_group *vg, struct logical_volume *lv,
struct lvcreate_params *lp)
{
int lock_type_num = get_lock_type_from_string(vg->lock_type);
switch (lock_type_num) {
case LOCK_TYPE_NONE:
case LOCK_TYPE_CLVM:
return 1;
case LOCK_TYPE_SANLOCK:
case LOCK_TYPE_DLM:
break;
default:
log_error("lockd_init_lv: unknown lock_type.");
return 0;
}
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
if (!lp->needs_lockd_init) {
/* needs_lock_init is set for LVs that need a lockd lock. */
return 1;
} else if (seg_is_cache_pool(lp)) {
/*
* A cache pool does not use a lockd lock because it cannot be
* used by itself. When a cache pool is attached to an actual
* LV, the lockd lock for that LV covers the LV and the cache
* pool attached to it.
*/
lv->lock_args = NULL;
return 1;
} else if (!seg_is_thin_volume(lp) && lp->snapshot) {
struct logical_volume *origin_lv;
/*
* COW snapshots are associated with their origin LV,
* and only the origin LV needs its own lock, which
* represents itself and all associated cow snapshots.
*/
if (!lp->origin_name) {
/* Sparse LV case. We require a lock from the origin LV. */
log_error("Cannot create snapshot without origin LV in shared VG.");
return 0;
}
if (!(origin_lv = find_lv(vg, lp->origin_name))) {
log_error("Failed to find origin LV %s/%s", vg->name, lp->origin_name);
return 0;
}
if (!lockd_lv(cmd, origin_lv, "ex", LDLV_PERSISTENT)) {
log_error("Failed to lock origin LV %s/%s", vg->name, lp->origin_name);
return 0;
}
lv->lock_args = NULL;
return 1;
} else if (seg_is_thin(lp)) {
if ((seg_is_thin_volume(lp) && !lp->create_pool) ||
(!seg_is_thin_volume(lp) && lp->snapshot)) {
struct lv_list *lvl;
/*
* Creating a new thin lv or snapshot. These lvs do not get
* their own lock but use the pool lock. If an lv does not
* use its own lock, its lock_args is set to NULL.
*/
if (!(lvl = find_lv_in_vg(vg, lp->pool_name))) {
log_error("Failed to find thin pool %s/%s", vg->name, lp->pool_name);
return 0;
}
if (!lockd_lv(cmd, lvl->lv, "ex", LDLV_PERSISTENT)) {
log_error("Failed to lock thin pool %s/%s", vg->name, lp->pool_name);
return 0;
}
lv->lock_args = NULL;
return 1;
} else if (seg_is_thin_volume(lp) && lp->create_pool) {
/*
* Creating a thin pool and a thin lv in it. We could
* probably make this work.
*
* This should not happen because the command defs are
* checked and excluded for shared VGs early in lvcreate.
*/
log_error("Create thin pool and thin LV separately with lock type %s",
vg->lock_type);
return 0;
} else if (!seg_is_thin_volume(lp) && lp->create_pool) {
/* Creating a thin pool only. */
/* lv_name_lock = lp->pool_name; */
} else {
log_error("Unknown thin options for lock init.");
return 0;
}
} else {
/* Creating a normal lv. */
/* lv_name_lock = lv_name; */
}
/*
* The LV gets its own lock, so set lock_args to non-NULL.
*
* lockd_init_lv_args() will be called during vg_write()
* to complete the sanlock LV lock initialization, where
* actual space on disk is allocated. Waiting to do this
* last step until vg_write() avoids the need to revert
* the sanlock allocation if the lvcreate function isn't
* completed.
*
* This works, but would leave the sanlock lease allocated
* unless the lease was freed on each early exit path from
* lvcreate:
*
* return lockd_init_lv_args(cmd, vg, lv_name_lock, lv_id,
* vg->lock_type, &lv->lock_args);
*/
if (!strcmp(vg->lock_type, "sanlock"))
lv->lock_args = "pending";
else if (!strcmp(vg->lock_type, "dlm"))
lv->lock_args = "dlm";
return 1;
}
/* lvremove */
int lockd_free_lv(struct cmd_context *cmd, struct volume_group *vg,
const char *lv_name, struct id *lv_id, const char *lock_args)
{
switch (get_lock_type_from_string(vg->lock_type)) {
case LOCK_TYPE_NONE:
case LOCK_TYPE_CLVM:
return 1;
case LOCK_TYPE_DLM:
case LOCK_TYPE_SANLOCK:
if (!lock_args)
return 1;
return _free_lv(cmd, vg, lv_name, lv_id, lock_args);
default:
log_error("lockd_free_lv: unknown lock_type.");
return 0;
}
}
int lockd_rename_vg_before(struct cmd_context *cmd, struct volume_group *vg)
{
daemon_reply reply;
int result;
int ret;
if (!vg_is_shared(vg))
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
if (lvs_in_vg_activated(vg)) {
log_error("LVs must be inactive before vgrename.");
return 0;
}
/* Check that no LVs are active on other hosts. */
if (!_lockd_all_lvs(cmd, vg)) {
log_error("Cannot rename VG %s with active LVs", vg->name);
return 0;
}
/*
* lvmlockd:
* checks for other hosts in lockspace
* leaves the lockspace
*/
reply = _lockd_send("rename_vg_before",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
daemon_reply_destroy(reply);
/* Other hosts have not stopped the lockspace. */
if (result == -EBUSY) {
log_error("Lockspace for \"%s\" not stopped on other hosts", vg->name);
return 0;
}
if (!ret) {
log_error("lockd_rename_vg_before lvmlockd result %d", result);
return 0;
}
if (!strcmp(vg->lock_type, "sanlock")) {
log_debug("lockd_rename_vg_before deactivate sanlock lv");
_deactivate_sanlock_lv(cmd, vg);
}
return 1;
}
int lockd_rename_vg_final(struct cmd_context *cmd, struct volume_group *vg, int success)
{
daemon_reply reply;
int result;
int ret;
if (!vg_is_shared(vg))
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
if (!success) {
/*
* Depending on the problem that caused the rename to
* fail, it may make sense to not restart the VG here.
*/
if (!lockd_start_vg(cmd, vg, 0, NULL))
log_error("Failed to restart VG %s lockspace.", vg->name);
return 1;
}
if (!strcmp(vg->lock_type, "sanlock")) {
if (!_activate_sanlock_lv(cmd, vg))
return 0;
/*
* lvmlockd needs to rewrite the leases on disk
* with the new VG (lockspace) name.
*/
reply = _lockd_send("rename_vg_final",
"pid = " FMTd64, (int64_t) getpid(),
"vg_name = %s", vg->name,
"vg_lock_type = %s", vg->lock_type,
"vg_lock_args = %s", vg->lock_args,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
ret = 0;
} else {
ret = (result < 0) ? 0 : 1;
}
daemon_reply_destroy(reply);
if (!ret) {
/*
* The VG has been renamed on disk, but renaming the
* sanlock leases failed. Cleaning this up can
* probably be done by converting the VG to lock_type
* none, then converting back to sanlock.
*/
log_error("lockd_rename_vg_final lvmlockd result %d", result);
return 0;
}
}
if (!lockd_start_vg(cmd, vg, 1, NULL))
log_error("Failed to start VG %s lockspace.", vg->name);
return 1;
}
const char *lockd_running_lock_type(struct cmd_context *cmd, int *found_multiple)
{
daemon_reply reply;
const char *lock_type = NULL;
int result;
if (!_use_lvmlockd)
return NULL;
if (!_lvmlockd_connected)
return NULL;
reply = _lockd_send("running_lm",
"pid = " FMTd64, (int64_t) getpid(),
NULL);
if (!_lockd_result(reply, &result, NULL)) {
log_error("Failed to get result from lvmlockd");
goto out;
}
switch (result) {
case -EXFULL:
*found_multiple = 1;
break;
case -ENOLCK:
break;
case LOCK_TYPE_SANLOCK:
log_debug("lvmlockd found sanlock");
lock_type = "sanlock";
break;
case LOCK_TYPE_DLM:
log_debug("lvmlockd found dlm");
lock_type = "dlm";
break;
default:
log_error("Failed to find a running lock manager.");
break;
}
out:
daemon_reply_destroy(reply);
return lock_type;
}
/* Some LV types have no lock. */
int lockd_lv_uses_lock(struct logical_volume *lv)
{
if (lv_is_thin_volume(lv))
return 0;
if (lv_is_thin_pool_data(lv))
return 0;
if (lv_is_thin_pool_metadata(lv))
return 0;
if (lv_is_pool_metadata_spare(lv))
return 0;
if (lv_is_cache_vol(lv))
return 0;
if (lv_is_cache_pool(lv))
return 0;
if (lv_is_cache_pool_data(lv))
return 0;
if (lv_is_cache_pool_metadata(lv))
return 0;
if (lv_is_cow(lv))
return 0;
if (lv_is_snapshot(lv))
return 0;
/* FIXME: lv_is_virtual_origin ? */
if (lv_is_lockd_sanlock_lv(lv))
return 0;
if (lv_is_mirror_image(lv))
return 0;
if (lv_is_mirror_log(lv))
return 0;
if (lv_is_raid_image(lv))
return 0;
if (lv_is_raid_metadata(lv))
return 0;
if (!lv_is_visible(lv))
return 0;
return 1;
}
/*
* send lvmlockd a request to use libdlmcontrol dlmc_run_start/dlmc_run_check
* to run a command on all nodes running dlm_controld:
* lvm lvchange --refresh --nolocking <path>
*/
int lockd_lv_refresh(struct cmd_context *cmd, struct lvresize_params *lp)
{
daemon_reply reply;
char *lv_uuid = lp->lockd_lv_refresh_uuid;
char *path = lp->lockd_lv_refresh_path;
int result;
if (!lv_uuid || !path)
return 1;
log_warn("Refreshing LV %s on other hosts...", path);
reply = _lockd_send("refresh_lv",
"pid = " FMTd64, (int64_t) getpid(),
"opts = %s", "none",
"lv_uuid = %s", lv_uuid,
"path = %s", path,
NULL);
if (!_lockd_result(reply, &result, NULL)) {
/* No result from lvmlockd, it is probably not running. */
log_error("LV refresh failed for LV %s", path);
return 0;
}
daemon_reply_destroy(reply);
if (result < 0) {
log_error("Failed to refresh LV on all hosts.");
log_error("Manual lvchange --refresh required on all hosts for %s.", path);
return 0;
}
return 1;
}
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