mirror of
git://sourceware.org/git/lvm2.git
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c23e7ff2a0
This is the client side handling of the global_invalid state added to lvmetad in commit c595b50cec8a6b95c6ac4988912d1412f3cc0237. The function added here: . checks if the global state in lvmetad is invalid . if so, scans disks to update the state in lvmetad . clears the global_invalid flag in lvmetad . updates the local udev db to reflect any changes
1582 lines
42 KiB
C
1582 lines
42 KiB
C
/*
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* Copyright (C) 2012 Red Hat, Inc.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "toolcontext.h"
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#include "metadata.h"
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#include "device.h"
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#include "lvmetad.h"
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#include "lvmcache.h"
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#include "lvmetad-client.h"
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#include "format-text.h" // TODO for disk_locn, used as a DA representation
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#include "crc.h"
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#include "lvm-signal.h"
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#define SCAN_TIMEOUT_SECONDS 80
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#define MAX_RESCANS 10 /* Maximum number of times to scan all PVs and retry if the daemon returns a token mismatch error */
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static daemon_handle _lvmetad = { .error = 0 };
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static int _lvmetad_use = 0;
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static int _lvmetad_connected = 0;
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static char *_lvmetad_token = NULL;
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static const char *_lvmetad_socket = NULL;
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static struct cmd_context *_lvmetad_cmd = NULL;
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static struct volume_group *lvmetad_pvscan_vg(struct cmd_context *cmd, struct volume_group *vg);
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void lvmetad_disconnect(void)
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{
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if (_lvmetad_connected)
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daemon_close(_lvmetad);
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_lvmetad_connected = 0;
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}
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void lvmetad_init(struct cmd_context *cmd)
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{
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if (!_lvmetad_use && !access(getenv("LVM_LVMETAD_PIDFILE") ? : LVMETAD_PIDFILE, F_OK))
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log_warn("WARNING: lvmetad is running but disabled."
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" Restart lvmetad before enabling it!");
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if (_lvmetad_connected)
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log_debug(INTERNAL_ERROR "Refreshing lvmetad global handle while connection with the daemon is active");
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_lvmetad_cmd = cmd;
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}
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static void _lvmetad_connect(void)
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{
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if (!_lvmetad_use || !_lvmetad_socket || _lvmetad_connected)
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return;
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_lvmetad = lvmetad_open(_lvmetad_socket);
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if (_lvmetad.socket_fd >= 0 && !_lvmetad.error) {
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log_debug_lvmetad("Successfully connected to lvmetad on fd %d.",
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_lvmetad.socket_fd);
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_lvmetad_connected = 1;
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}
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}
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void lvmetad_connect_or_warn(void)
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{
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if (!_lvmetad_use)
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return;
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if (!_lvmetad_connected && !_lvmetad.error) {
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_lvmetad_connect();
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if ((_lvmetad.socket_fd < 0 || _lvmetad.error))
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log_warn("WARNING: Failed to connect to lvmetad. Falling back to internal scanning.");
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}
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}
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int lvmetad_used(void)
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{
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return _lvmetad_use;
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}
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int lvmetad_socket_present(void)
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{
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const char *socket = _lvmetad_socket ?: LVMETAD_SOCKET;
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int r;
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if ((r = access(socket, F_OK)) && errno != ENOENT)
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log_sys_error("lvmetad_socket_present", "");
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return !r;
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}
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int lvmetad_active(void)
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{
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lvmetad_connect_or_warn();
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return _lvmetad_connected;
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}
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void lvmetad_set_active(struct cmd_context *cmd, int active)
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{
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_lvmetad_use = active;
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if (!active && lvmetad_active())
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lvmetad_disconnect();
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if (cmd && !refresh_filters(cmd))
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stack;
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}
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/*
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* Use a crc of the strings in the filter as the lvmetad token.
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*/
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void lvmetad_set_token(const struct dm_config_value *filter)
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{
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int ft = 0;
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dm_free(_lvmetad_token);
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while (filter && filter->type == DM_CFG_STRING) {
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ft = calc_crc(ft, (const uint8_t *) filter->v.str, strlen(filter->v.str));
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filter = filter->next;
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}
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if (dm_asprintf(&_lvmetad_token, "filter:%u", ft) < 0)
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log_warn("WARNING: Failed to set lvmetad token. Out of memory?");
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}
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void lvmetad_release_token(void)
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{
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dm_free(_lvmetad_token);
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_lvmetad_token = NULL;
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}
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void lvmetad_set_socket(const char *sock)
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{
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_lvmetad_socket = sock;
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}
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static int _lvmetad_pvscan_all_devs(struct cmd_context *cmd, activation_handler handler,
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int ignore_obsolete);
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static daemon_reply _lvmetad_send(const char *id, ...)
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{
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va_list ap;
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daemon_reply repl;
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daemon_request req;
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unsigned num_rescans = 0;
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unsigned total_usecs_waited = 0;
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unsigned max_remaining_sleep_times = 1;
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unsigned wait_usecs;
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retry:
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req = daemon_request_make(id);
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if (_lvmetad_token)
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daemon_request_extend(req, "token = %s", _lvmetad_token, NULL);
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va_start(ap, id);
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daemon_request_extend_v(req, ap);
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va_end(ap);
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repl = daemon_send(_lvmetad, req);
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daemon_request_destroy(req);
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/*
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* If another process is trying to scan, it might have the
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* same future token id and it's better to wait and avoid doing
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* the work multiple times. For the case where the future token is
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* different, the wait is randomized so that multiple waiting
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* processes do not start scanning all at once.
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*
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* If the token is mismatched because of global_filter changes,
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* we re-scan immediately, but if we lose the potential race for
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* the update, we back off for a short while (0.05-0.5 seconds) and
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* try again.
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*/
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if (!repl.error && !strcmp(daemon_reply_str(repl, "response", ""), "token_mismatch") &&
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num_rescans < MAX_RESCANS && total_usecs_waited < (SCAN_TIMEOUT_SECONDS * 1000000) && !test_mode()) {
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if (!strcmp(daemon_reply_str(repl, "expected", ""), "update in progress") ||
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max_remaining_sleep_times) {
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wait_usecs = 50000 + lvm_even_rand(&_lvmetad_cmd->rand_seed, 450000); /* between 0.05s and 0.5s */
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(void) usleep(wait_usecs);
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total_usecs_waited += wait_usecs;
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if (max_remaining_sleep_times)
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max_remaining_sleep_times--; /* Sleep once before rescanning the first time, then 5 times each time after that. */
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} else {
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/* If the re-scan fails here, we try again later. */
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(void) _lvmetad_pvscan_all_devs(_lvmetad_cmd, NULL, 0);
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num_rescans++;
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max_remaining_sleep_times = 5;
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}
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daemon_reply_destroy(repl);
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goto retry;
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}
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return repl;
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}
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static int _token_update(void)
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{
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daemon_reply repl;
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log_debug_lvmetad("Sending updated token to lvmetad: %s", _lvmetad_token ? : "<NONE>");
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repl = _lvmetad_send("token_update", NULL);
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if (repl.error || strcmp(daemon_reply_str(repl, "response", ""), "OK")) {
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daemon_reply_destroy(repl);
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return 0;
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}
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daemon_reply_destroy(repl);
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return 1;
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}
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/*
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* Helper; evaluate the reply from lvmetad, check for errors, print diagnostics
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* and return a summary success/failure exit code.
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*
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* If found is set, *found indicates whether or not device exists,
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* and missing device is not treated as an error.
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*/
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static int _lvmetad_handle_reply(daemon_reply reply, const char *action, const char *object,
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int *found)
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{
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if (reply.error) {
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log_error("Request to %s %s%sin lvmetad gave response %s.",
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action, object, *object ? " " : "", strerror(reply.error));
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return 0;
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}
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/* All OK? */
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if (!strcmp(daemon_reply_str(reply, "response", ""), "OK")) {
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if (found)
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*found = 1;
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return 1;
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}
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/* Unknown device permitted? */
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if (found && !strcmp(daemon_reply_str(reply, "response", ""), "unknown")) {
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log_very_verbose("Request to %s %s%sin lvmetad did not find any matching object.",
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action, object, *object ? " " : "");
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*found = 0;
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return 1;
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}
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log_error("Request to %s %s%sin lvmetad gave response %s. Reason: %s",
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action, object, *object ? " " : "",
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daemon_reply_str(reply, "response", "<missing>"),
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daemon_reply_str(reply, "reason", "<missing>"));
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return 0;
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}
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static int _read_mda(struct lvmcache_info *info,
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struct format_type *fmt,
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const struct dm_config_node *cn)
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{
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struct metadata_area_ops *ops;
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dm_list_iterate_items(ops, &fmt->mda_ops)
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if (ops->mda_import_text && ops->mda_import_text(info, cn))
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return 1;
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return 0;
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}
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static int _pv_populate_lvmcache(struct cmd_context *cmd,
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struct dm_config_node *cn,
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struct format_type *fmt, dev_t fallback)
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{
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struct device *dev, *dev_alternate, *dev_alternate_cache = NULL;
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struct label *label;
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struct id pvid, vgid;
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char mda_id[32];
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char da_id[32];
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int i = 0;
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struct dm_config_node *mda, *da;
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struct dm_config_node *alt_devices = dm_config_find_node(cn->child, "devices_alternate");
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struct dm_config_value *alt_device = NULL;
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uint64_t offset, size;
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struct lvmcache_info *info, *info_alternate;
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const char *pvid_txt = dm_config_find_str(cn->child, "id", NULL),
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*vgid_txt = dm_config_find_str(cn->child, "vgid", NULL),
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*vgname = dm_config_find_str(cn->child, "vgname", NULL),
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*fmt_name = dm_config_find_str(cn->child, "format", NULL);
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dev_t devt = dm_config_find_int(cn->child, "device", 0);
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uint64_t devsize = dm_config_find_int64(cn->child, "dev_size", 0),
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label_sector = dm_config_find_int64(cn->child, "label_sector", 0);
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if (!fmt && fmt_name)
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fmt = get_format_by_name(cmd, fmt_name);
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if (!fmt) {
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log_error("PV %s not recognised. Is the device missing?", pvid_txt);
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return 0;
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}
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dev = dev_cache_get_by_devt(devt, cmd->filter);
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if (!dev && fallback)
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dev = dev_cache_get_by_devt(fallback, cmd->filter);
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if (!dev) {
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log_warn("WARNING: Device for PV %s not found or rejected by a filter.", pvid_txt);
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return 0;
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}
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if (!pvid_txt || !id_read_format(&pvid, pvid_txt)) {
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log_error("Missing or ill-formatted PVID for PV: %s.", pvid_txt);
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return 0;
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}
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if (vgid_txt) {
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if (!id_read_format(&vgid, vgid_txt))
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return_0;
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} else
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strcpy((char*)&vgid, fmt->orphan_vg_name);
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if (!vgname)
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vgname = fmt->orphan_vg_name;
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if (!(info = lvmcache_add(fmt->labeller, (const char *)&pvid, dev,
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vgname, (const char *)&vgid, 0)))
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return_0;
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lvmcache_get_label(info)->sector = label_sector;
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lvmcache_get_label(info)->dev = dev;
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lvmcache_set_device_size(info, devsize);
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lvmcache_del_das(info);
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lvmcache_del_mdas(info);
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lvmcache_del_bas(info);
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do {
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sprintf(mda_id, "mda%d", i);
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mda = dm_config_find_node(cn->child, mda_id);
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if (mda)
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_read_mda(info, fmt, mda);
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++i;
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} while (mda);
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i = 0;
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do {
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sprintf(da_id, "da%d", i);
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da = dm_config_find_node(cn->child, da_id);
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if (da) {
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if (!dm_config_get_uint64(da->child, "offset", &offset)) return_0;
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if (!dm_config_get_uint64(da->child, "size", &size)) return_0;
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lvmcache_add_da(info, offset, size);
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}
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++i;
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} while (da);
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i = 0;
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do {
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sprintf(da_id, "ba%d", i);
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da = dm_config_find_node(cn->child, da_id);
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if (da) {
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if (!dm_config_get_uint64(da->child, "offset", &offset)) return_0;
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if (!dm_config_get_uint64(da->child, "size", &size)) return_0;
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lvmcache_add_ba(info, offset, size);
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}
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++i;
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} while (da);
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if (alt_devices)
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alt_device = alt_devices->v;
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while (alt_device) {
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dev_alternate = dev_cache_get_by_devt(alt_device->v.i, cmd->filter);
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if (dev_alternate) {
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if ((info_alternate = lvmcache_add(fmt->labeller, (const char *)&pvid, dev_alternate,
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vgname, (const char *)&vgid, 0))) {
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dev_alternate_cache = dev_alternate;
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info = info_alternate;
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lvmcache_get_label(info)->dev = dev_alternate;
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}
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} else {
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log_warn("Duplicate of PV %s dev %s exists on unknown device %"PRId64 ":%" PRId64,
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pvid_txt, dev_name(dev), MAJOR(alt_device->v.i), MINOR(alt_device->v.i));
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}
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alt_device = alt_device->next;
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}
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/*
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* Update lvmcache with the info about the alternate device by
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* reading its label, which should update lvmcache.
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*/
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if (dev_alternate_cache) {
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if (!label_read(dev_alternate_cache, &label, 0)) {
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log_warn("No PV label found on duplicate device %s.", dev_name(dev_alternate_cache));
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}
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}
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lvmcache_set_preferred_duplicates((const char *)&vgid);
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return 1;
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}
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static int _pv_update_struct_pv(struct physical_volume *pv, struct format_instance *fid)
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{
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struct lvmcache_info *info;
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if ((info = lvmcache_info_from_pvid((const char *)&pv->id, 0))) {
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pv->label_sector = lvmcache_get_label(info)->sector;
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pv->dev = lvmcache_device(info);
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if (!pv->dev)
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pv->status |= MISSING_PV;
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if (!lvmcache_fid_add_mdas_pv(info, fid))
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return_0;
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pv->fid = fid;
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} else
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pv->status |= MISSING_PV; /* probably missing */
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return 1;
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}
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struct volume_group *lvmetad_vg_lookup(struct cmd_context *cmd, const char *vgname, const char *vgid)
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{
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struct volume_group *vg = NULL;
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struct volume_group *vg2 = NULL;
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daemon_reply reply;
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int found;
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char uuid[64];
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struct format_instance *fid = NULL;
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struct format_instance_ctx fic;
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struct dm_config_node *top;
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const char *name, *diag_name;
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const char *fmt_name;
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struct format_type *fmt;
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struct dm_config_node *pvcn;
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struct pv_list *pvl;
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if (!lvmetad_active())
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return NULL;
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if (vgid) {
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if (!id_write_format((const struct id*)vgid, uuid, sizeof(uuid)))
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return_NULL;
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log_debug_lvmetad("Asking lvmetad for VG %s (%s)", uuid, vgname ? : "name unknown");
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reply = _lvmetad_send("vg_lookup", "uuid = %s", uuid, NULL);
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diag_name = uuid;
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} else {
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if (!vgname) {
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log_error(INTERNAL_ERROR "VG name required (VGID not available)");
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reply = _lvmetad_send("vg_lookup", "name = %s", "MISSING", NULL);
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goto out;
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}
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log_debug_lvmetad("Asking lvmetad for VG %s", vgname);
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reply = _lvmetad_send("vg_lookup", "name = %s", vgname, NULL);
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diag_name = vgname;
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}
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if (_lvmetad_handle_reply(reply, "lookup VG", diag_name, &found) && found) {
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if (!(top = dm_config_find_node(reply.cft->root, "metadata"))) {
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log_error(INTERNAL_ERROR "metadata config node not found.");
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goto out;
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}
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name = daemon_reply_str(reply, "name", NULL);
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|
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/* fall back to lvm2 if we don't know better */
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fmt_name = dm_config_find_str(top, "metadata/format", "lvm2");
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if (!(fmt = get_format_by_name(cmd, fmt_name))) {
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log_error(INTERNAL_ERROR
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"We do not know the format (%s) reported by lvmetad.",
|
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fmt_name);
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goto out;
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}
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|
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fic.type = FMT_INSTANCE_MDAS | FMT_INSTANCE_AUX_MDAS;
|
|
fic.context.vg_ref.vg_name = name;
|
|
fic.context.vg_ref.vg_id = vgid;
|
|
|
|
if (!(fid = fmt->ops->create_instance(fmt, &fic)))
|
|
goto_out;
|
|
|
|
if ((pvcn = dm_config_find_node(top, "metadata/physical_volumes")))
|
|
for (pvcn = pvcn->child; pvcn; pvcn = pvcn->sib)
|
|
_pv_populate_lvmcache(cmd, pvcn, fmt, 0);
|
|
|
|
if ((pvcn = dm_config_find_node(top, "metadata/outdated_pvs")))
|
|
for (pvcn = pvcn->child; pvcn; pvcn = pvcn->sib)
|
|
_pv_populate_lvmcache(cmd, pvcn, fmt, 0);
|
|
|
|
top->key = name;
|
|
if (!(vg = import_vg_from_lvmetad_config_tree(reply.cft, fid)))
|
|
goto_out;
|
|
|
|
/*
|
|
* locking may have detected a newer vg version and
|
|
* invalidated the cached vg.
|
|
*/
|
|
if (dm_config_find_node(reply.cft->root, "vg_invalid")) {
|
|
log_debug_lvmetad("Update invalid lvmetad cache for VG %s", vgname);
|
|
vg2 = lvmetad_pvscan_vg(cmd, vg);
|
|
release_vg(vg);
|
|
vg = vg2;
|
|
fid = vg->fid;
|
|
}
|
|
|
|
dm_list_iterate_items(pvl, &vg->pvs) {
|
|
if (!_pv_update_struct_pv(pvl->pv, fid)) {
|
|
vg = NULL;
|
|
goto_out; /* FIXME error path */
|
|
}
|
|
}
|
|
|
|
dm_list_iterate_items(pvl, &vg->pvs_outdated) {
|
|
if (!_pv_update_struct_pv(pvl->pv, fid)) {
|
|
vg = NULL;
|
|
goto_out; /* FIXME error path */
|
|
}
|
|
}
|
|
|
|
lvmcache_update_vg(vg, 0);
|
|
vg_mark_partial_lvs(vg, 1);
|
|
}
|
|
|
|
out:
|
|
if (!vg && fid)
|
|
fid->fmt->ops->destroy_instance(fid);
|
|
daemon_reply_destroy(reply);
|
|
|
|
return vg;
|
|
}
|
|
|
|
struct _fixup_baton {
|
|
int i;
|
|
int find;
|
|
int ignore;
|
|
};
|
|
|
|
static int _fixup_ignored(struct metadata_area *mda, void *baton) {
|
|
struct _fixup_baton *b = baton;
|
|
if (b->i == b->find)
|
|
mda_set_ignored(mda, b->ignore);
|
|
b->i ++;
|
|
return 1;
|
|
}
|
|
|
|
int lvmetad_vg_update(struct volume_group *vg)
|
|
{
|
|
daemon_reply reply;
|
|
struct dm_hash_node *n;
|
|
struct metadata_area *mda;
|
|
char mda_id[128], *num;
|
|
struct pv_list *pvl;
|
|
struct lvmcache_info *info;
|
|
struct _fixup_baton baton;
|
|
|
|
if (!vg)
|
|
return 0;
|
|
|
|
if (!lvmetad_active() || test_mode())
|
|
return 1; /* fake it */
|
|
|
|
if (!vg->cft_precommitted) {
|
|
log_error(INTERNAL_ERROR "VG update without precommited");
|
|
return 0;
|
|
}
|
|
|
|
log_debug_lvmetad("Sending lvmetad updated metadata for VG %s (seqno %" PRIu32 ")", vg->name, vg->seqno);
|
|
reply = _lvmetad_send("vg_update", "vgname = %s", vg->name,
|
|
"metadata = %t", vg->cft_precommitted, NULL);
|
|
|
|
if (!_lvmetad_handle_reply(reply, "update VG", vg->name, NULL)) {
|
|
daemon_reply_destroy(reply);
|
|
return 0;
|
|
}
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
n = (vg->fid && vg->fid->metadata_areas_index) ?
|
|
dm_hash_get_first(vg->fid->metadata_areas_index) : NULL;
|
|
while (n) {
|
|
mda = dm_hash_get_data(vg->fid->metadata_areas_index, n);
|
|
strcpy(mda_id, dm_hash_get_key(vg->fid->metadata_areas_index, n));
|
|
if ((num = strchr(mda_id, '_'))) {
|
|
*num = 0;
|
|
++num;
|
|
if ((info = lvmcache_info_from_pvid(mda_id, 0))) {
|
|
memset(&baton, 0, sizeof(baton));
|
|
baton.find = atoi(num);
|
|
baton.ignore = mda_is_ignored(mda);
|
|
lvmcache_foreach_mda(info, _fixup_ignored, &baton);
|
|
}
|
|
}
|
|
n = dm_hash_get_next(vg->fid->metadata_areas_index, n);
|
|
}
|
|
|
|
dm_list_iterate_items(pvl, &vg->pvs) {
|
|
/* NB. the PV fmt pointer is sometimes wrong during vgconvert */
|
|
if (pvl->pv->dev && !lvmetad_pv_found(&pvl->pv->id, pvl->pv->dev,
|
|
vg->fid ? vg->fid->fmt : pvl->pv->fmt,
|
|
pvl->pv->label_sector, NULL, NULL))
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int lvmetad_vg_remove(struct volume_group *vg)
|
|
{
|
|
char uuid[64];
|
|
daemon_reply reply;
|
|
int result;
|
|
|
|
if (!lvmetad_active() || test_mode())
|
|
return 1; /* just fake it */
|
|
|
|
if (!id_write_format(&vg->id, uuid, sizeof(uuid)))
|
|
return_0;
|
|
|
|
log_debug_lvmetad("Telling lvmetad to remove VGID %s (%s)", uuid, vg->name);
|
|
reply = _lvmetad_send("vg_remove", "uuid = %s", uuid, NULL);
|
|
result = _lvmetad_handle_reply(reply, "remove VG", vg->name, NULL);
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
return result;
|
|
}
|
|
|
|
int lvmetad_pv_lookup(struct cmd_context *cmd, struct id pvid, int *found)
|
|
{
|
|
char uuid[64];
|
|
daemon_reply reply;
|
|
int result = 0;
|
|
struct dm_config_node *cn;
|
|
|
|
if (!lvmetad_active())
|
|
return_0;
|
|
|
|
if (!id_write_format(&pvid, uuid, sizeof(uuid)))
|
|
return_0;
|
|
|
|
log_debug_lvmetad("Asking lvmetad for PV %s", uuid);
|
|
reply = _lvmetad_send("pv_lookup", "uuid = %s", uuid, NULL);
|
|
if (!_lvmetad_handle_reply(reply, "lookup PV", "", found))
|
|
goto_out;
|
|
|
|
if (found && !*found)
|
|
goto out_success;
|
|
|
|
if (!(cn = dm_config_find_node(reply.cft->root, "physical_volume")))
|
|
goto_out;
|
|
else if (!_pv_populate_lvmcache(cmd, cn, NULL, 0))
|
|
goto_out;
|
|
|
|
out_success:
|
|
result = 1;
|
|
|
|
out:
|
|
daemon_reply_destroy(reply);
|
|
|
|
return result;
|
|
}
|
|
|
|
int lvmetad_pv_lookup_by_dev(struct cmd_context *cmd, struct device *dev, int *found)
|
|
{
|
|
int result = 0;
|
|
daemon_reply reply;
|
|
struct dm_config_node *cn;
|
|
|
|
if (!lvmetad_active())
|
|
return_0;
|
|
|
|
log_debug_lvmetad("Asking lvmetad for PV on %s", dev_name(dev));
|
|
reply = _lvmetad_send("pv_lookup", "device = %" PRId64, (int64_t) dev->dev, NULL);
|
|
if (!_lvmetad_handle_reply(reply, "lookup PV", dev_name(dev), found))
|
|
goto_out;
|
|
|
|
if (found && !*found)
|
|
goto out_success;
|
|
|
|
cn = dm_config_find_node(reply.cft->root, "physical_volume");
|
|
if (!cn || !_pv_populate_lvmcache(cmd, cn, NULL, dev->dev))
|
|
goto_out;
|
|
|
|
out_success:
|
|
result = 1;
|
|
|
|
out:
|
|
daemon_reply_destroy(reply);
|
|
return result;
|
|
}
|
|
|
|
int lvmetad_pv_list_to_lvmcache(struct cmd_context *cmd)
|
|
{
|
|
daemon_reply reply;
|
|
struct dm_config_node *cn;
|
|
|
|
if (!lvmetad_active())
|
|
return 1;
|
|
|
|
log_debug_lvmetad("Asking lvmetad for complete list of known PVs");
|
|
reply = _lvmetad_send("pv_list", NULL);
|
|
if (!_lvmetad_handle_reply(reply, "list PVs", "", NULL)) {
|
|
daemon_reply_destroy(reply);
|
|
return_0;
|
|
}
|
|
|
|
if ((cn = dm_config_find_node(reply.cft->root, "physical_volumes")))
|
|
for (cn = cn->child; cn; cn = cn->sib)
|
|
_pv_populate_lvmcache(cmd, cn, NULL, 0);
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int lvmetad_get_vgnameids(struct cmd_context *cmd, struct dm_list *vgnameids)
|
|
{
|
|
struct vgnameid_list *vgnl;
|
|
struct id vgid;
|
|
const char *vgid_txt;
|
|
const char *vg_name;
|
|
daemon_reply reply;
|
|
struct dm_config_node *cn;
|
|
|
|
log_debug_lvmetad("Asking lvmetad for complete list of known VG ids/names");
|
|
reply = _lvmetad_send("vg_list", NULL);
|
|
if (!_lvmetad_handle_reply(reply, "list VGs", "", NULL)) {
|
|
daemon_reply_destroy(reply);
|
|
return_0;
|
|
}
|
|
|
|
if ((cn = dm_config_find_node(reply.cft->root, "volume_groups"))) {
|
|
for (cn = cn->child; cn; cn = cn->sib) {
|
|
vgid_txt = cn->key;
|
|
if (!id_read_format(&vgid, vgid_txt)) {
|
|
stack;
|
|
continue;
|
|
}
|
|
|
|
if (!(vgnl = dm_pool_alloc(cmd->mem, sizeof(*vgnl)))) {
|
|
log_error("vgnameid_list allocation failed.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(vg_name = dm_config_find_str(cn->child, "name", NULL))) {
|
|
log_error("vg_list no name found.");
|
|
return 0;
|
|
}
|
|
|
|
vgnl->vgid = dm_pool_strdup(cmd->mem, (char *)&vgid);
|
|
vgnl->vg_name = dm_pool_strdup(cmd->mem, vg_name);
|
|
|
|
if (!vgnl->vgid || !vgnl->vg_name) {
|
|
log_error("vgnameid_list member allocation failed.");
|
|
return 0;
|
|
}
|
|
|
|
dm_list_add(vgnameids, &vgnl->list);
|
|
}
|
|
}
|
|
|
|
daemon_reply_destroy(reply);
|
|
return 1;
|
|
}
|
|
|
|
int lvmetad_vg_list_to_lvmcache(struct cmd_context *cmd)
|
|
{
|
|
struct volume_group *tmp;
|
|
struct id vgid;
|
|
const char *vgid_txt;
|
|
daemon_reply reply;
|
|
struct dm_config_node *cn;
|
|
|
|
if (!lvmetad_active())
|
|
return 1;
|
|
|
|
log_debug_lvmetad("Asking lvmetad for complete list of known VGs");
|
|
reply = _lvmetad_send("vg_list", NULL);
|
|
if (!_lvmetad_handle_reply(reply, "list VGs", "", NULL)) {
|
|
daemon_reply_destroy(reply);
|
|
return_0;
|
|
}
|
|
|
|
if ((cn = dm_config_find_node(reply.cft->root, "volume_groups")))
|
|
for (cn = cn->child; cn; cn = cn->sib) {
|
|
vgid_txt = cn->key;
|
|
if (!id_read_format(&vgid, vgid_txt)) {
|
|
stack;
|
|
continue;
|
|
}
|
|
|
|
/* the call to lvmetad_vg_lookup will poke the VG into lvmcache */
|
|
tmp = lvmetad_vg_lookup(cmd, NULL, (const char*)&vgid);
|
|
release_vg(tmp);
|
|
}
|
|
|
|
daemon_reply_destroy(reply);
|
|
return 1;
|
|
}
|
|
|
|
struct _extract_dl_baton {
|
|
int i;
|
|
struct dm_config_tree *cft;
|
|
struct dm_config_node *pre_sib;
|
|
};
|
|
|
|
static int _extract_mda(struct metadata_area *mda, void *baton)
|
|
{
|
|
struct _extract_dl_baton *b = baton;
|
|
struct dm_config_node *cn;
|
|
char id[32];
|
|
|
|
if (!mda->ops->mda_export_text) /* do nothing */
|
|
return 1;
|
|
|
|
(void) dm_snprintf(id, 32, "mda%d", b->i);
|
|
if (!(cn = make_config_node(b->cft, id, b->cft->root, b->pre_sib)))
|
|
return 0;
|
|
if (!mda->ops->mda_export_text(mda, b->cft, cn))
|
|
return 0;
|
|
|
|
b->i ++;
|
|
b->pre_sib = cn; /* for efficiency */
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _extract_disk_location(const char *name, struct disk_locn *dl, void *baton)
|
|
{
|
|
struct _extract_dl_baton *b = baton;
|
|
struct dm_config_node *cn;
|
|
char id[32];
|
|
|
|
if (!dl)
|
|
return 1;
|
|
|
|
(void) dm_snprintf(id, 32, "%s%d", name, b->i);
|
|
if (!(cn = make_config_node(b->cft, id, b->cft->root, b->pre_sib)))
|
|
return 0;
|
|
if (!config_make_nodes(b->cft, cn, NULL,
|
|
"offset = %"PRId64, (int64_t) dl->offset,
|
|
"size = %"PRId64, (int64_t) dl->size,
|
|
NULL))
|
|
return 0;
|
|
|
|
b->i ++;
|
|
b->pre_sib = cn; /* for efficiency */
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _extract_da(struct disk_locn *da, void *baton)
|
|
{
|
|
return _extract_disk_location("da", da, baton);
|
|
}
|
|
|
|
static int _extract_ba(struct disk_locn *ba, void *baton)
|
|
{
|
|
return _extract_disk_location("ba", ba, baton);
|
|
}
|
|
|
|
static int _extract_mdas(struct lvmcache_info *info, struct dm_config_tree *cft,
|
|
struct dm_config_node *pre_sib)
|
|
{
|
|
struct _extract_dl_baton baton = { .i = 0, .cft = cft, .pre_sib = NULL };
|
|
|
|
if (!lvmcache_foreach_mda(info, &_extract_mda, &baton))
|
|
return 0;
|
|
baton.i = 0;
|
|
if (!lvmcache_foreach_da(info, &_extract_da, &baton))
|
|
return 0;
|
|
baton.i = 0;
|
|
if (!lvmcache_foreach_ba(info, &_extract_ba, &baton))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int lvmetad_pv_found(const struct id *pvid, struct device *dev, const struct format_type *fmt,
|
|
uint64_t label_sector, struct volume_group *vg, activation_handler handler)
|
|
{
|
|
char uuid[64];
|
|
daemon_reply reply;
|
|
struct lvmcache_info *info;
|
|
struct dm_config_tree *pvmeta, *vgmeta;
|
|
const char *status, *vgname, *vgid;
|
|
int64_t changed;
|
|
int result;
|
|
|
|
if (!lvmetad_active() || test_mode())
|
|
return 1;
|
|
|
|
if (!id_write_format(pvid, uuid, sizeof(uuid)))
|
|
return_0;
|
|
|
|
pvmeta = dm_config_create();
|
|
if (!pvmeta)
|
|
return_0;
|
|
|
|
info = lvmcache_info_from_pvid((const char *)pvid, 0);
|
|
|
|
if (!(pvmeta->root = make_config_node(pvmeta, "pv", NULL, NULL))) {
|
|
dm_config_destroy(pvmeta);
|
|
return_0;
|
|
}
|
|
|
|
if (!config_make_nodes(pvmeta, pvmeta->root, NULL,
|
|
"device = %"PRId64, (int64_t) dev->dev,
|
|
"dev_size = %"PRId64, (int64_t) (info ? lvmcache_device_size(info) : 0),
|
|
"format = %s", fmt->name,
|
|
"label_sector = %"PRId64, (int64_t) label_sector,
|
|
"id = %s", uuid,
|
|
NULL))
|
|
{
|
|
dm_config_destroy(pvmeta);
|
|
return_0;
|
|
}
|
|
|
|
if (info)
|
|
/* FIXME A more direct route would be much preferable. */
|
|
_extract_mdas(info, pvmeta, pvmeta->root);
|
|
|
|
if (vg) {
|
|
if (!(vgmeta = export_vg_to_config_tree(vg))) {
|
|
dm_config_destroy(pvmeta);
|
|
return_0;
|
|
}
|
|
|
|
log_debug_lvmetad("Telling lvmetad to store PV %s (%s) in VG %s", dev_name(dev), uuid, vg->name);
|
|
reply = _lvmetad_send("pv_found",
|
|
"pvmeta = %t", pvmeta,
|
|
"vgname = %s", vg->name,
|
|
"metadata = %t", vgmeta,
|
|
NULL);
|
|
dm_config_destroy(vgmeta);
|
|
} else {
|
|
/*
|
|
* There is no VG metadata stored on this PV.
|
|
* It might or might not be an orphan.
|
|
*/
|
|
log_debug_lvmetad("Telling lvmetad to store PV %s (%s)", dev_name(dev), uuid);
|
|
reply = _lvmetad_send("pv_found", "pvmeta = %t", pvmeta, NULL);
|
|
}
|
|
|
|
dm_config_destroy(pvmeta);
|
|
|
|
result = _lvmetad_handle_reply(reply, "update PV", uuid, NULL);
|
|
|
|
if (vg && result &&
|
|
(daemon_reply_int(reply, "seqno_after", -1) != vg->seqno ||
|
|
daemon_reply_int(reply, "seqno_after", -1) != daemon_reply_int(reply, "seqno_before", -1)))
|
|
log_warn("WARNING: Inconsistent metadata found for VG %s", vg->name);
|
|
|
|
if (result && handler) {
|
|
status = daemon_reply_str(reply, "status", "<missing>");
|
|
vgname = daemon_reply_str(reply, "vgname", "<missing>");
|
|
vgid = daemon_reply_str(reply, "vgid", "<missing>");
|
|
changed = daemon_reply_int(reply, "changed", 0);
|
|
if (!strcmp(status, "partial"))
|
|
handler(_lvmetad_cmd, vgname, vgid, 1, changed, CHANGE_AAY);
|
|
else if (!strcmp(status, "complete"))
|
|
handler(_lvmetad_cmd, vgname, vgid, 0, changed, CHANGE_AAY);
|
|
else if (!strcmp(status, "orphan"))
|
|
;
|
|
else
|
|
log_error("Request to %s %s in lvmetad gave status %s.",
|
|
"update PV", uuid, status);
|
|
}
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
return result;
|
|
}
|
|
|
|
int lvmetad_pv_gone(dev_t devno, const char *pv_name, activation_handler handler)
|
|
{
|
|
daemon_reply reply;
|
|
int result;
|
|
int found;
|
|
|
|
if (!lvmetad_active() || test_mode())
|
|
return 1;
|
|
|
|
/*
|
|
* TODO: automatic volume deactivation takes place here *before*
|
|
* all cached info is gone - call handler. Also, consider
|
|
* integrating existing deactivation script that deactivates
|
|
* the whole stack from top to bottom (not yet upstream).
|
|
*/
|
|
|
|
log_debug_lvmetad("Telling lvmetad to forget any PV on %s", pv_name);
|
|
reply = _lvmetad_send("pv_gone", "device = %" PRId64, (int64_t) devno, NULL);
|
|
|
|
result = _lvmetad_handle_reply(reply, "drop PV", pv_name, &found);
|
|
/* We don't care whether or not the daemon had the PV cached. */
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
return result;
|
|
}
|
|
|
|
int lvmetad_pv_gone_by_dev(struct device *dev, activation_handler handler)
|
|
{
|
|
return lvmetad_pv_gone(dev->dev, dev_name(dev), handler);
|
|
}
|
|
|
|
/*
|
|
* The following code implements pvscan --cache.
|
|
*/
|
|
|
|
struct _lvmetad_pvscan_baton {
|
|
struct volume_group *vg;
|
|
struct format_instance *fid;
|
|
};
|
|
|
|
static int _lvmetad_pvscan_single(struct metadata_area *mda, void *baton)
|
|
{
|
|
struct _lvmetad_pvscan_baton *b = baton;
|
|
struct volume_group *this;
|
|
|
|
this = mda_is_ignored(mda) ? NULL : mda->ops->vg_read(b->fid, "", mda, NULL, NULL, 1);
|
|
|
|
/* FIXME Also ensure contents match etc. */
|
|
if (!b->vg || this->seqno > b->vg->seqno)
|
|
b->vg = this;
|
|
else if (b->vg)
|
|
release_vg(this);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* The lock manager may detect that the vg cached in lvmetad is out of date,
|
|
* due to something like an lvcreate from another host.
|
|
* This is limited to changes that only affect the vg (not global state like
|
|
* orphan PVs), so we only need to reread mdas on the vg's existing pvs.
|
|
*/
|
|
|
|
static struct volume_group *lvmetad_pvscan_vg(struct cmd_context *cmd, struct volume_group *vg)
|
|
{
|
|
struct volume_group *vg_ret = NULL;
|
|
struct dm_config_tree *vgmeta_ret = NULL;
|
|
struct dm_config_tree *vgmeta;
|
|
struct pv_list *pvl;
|
|
struct lvmcache_info *info;
|
|
struct format_instance *fid;
|
|
struct format_instance_ctx fic = { .type = 0 };
|
|
struct _lvmetad_pvscan_baton baton;
|
|
|
|
dm_list_iterate_items(pvl, &vg->pvs) {
|
|
/* missing pv */
|
|
if (!pvl->pv->dev)
|
|
continue;
|
|
|
|
info = lvmcache_info_from_pvid((const char *)&pvl->pv->id, 0);
|
|
|
|
baton.vg = NULL;
|
|
baton.fid = lvmcache_fmt(info)->ops->create_instance(lvmcache_fmt(info), &fic);
|
|
|
|
if (!baton.fid)
|
|
return NULL;
|
|
|
|
if (baton.fid->fmt->features & FMT_OBSOLETE) {
|
|
log_error("WARNING: Ignoring obsolete format of metadata (%s) on device %s when using lvmetad",
|
|
baton.fid->fmt->name, dev_name(pvl->pv->dev));
|
|
lvmcache_fmt(info)->ops->destroy_instance(baton.fid);
|
|
return NULL;
|
|
}
|
|
|
|
lvmcache_foreach_mda(info, _lvmetad_pvscan_single, &baton);
|
|
|
|
if (!baton.vg) {
|
|
lvmcache_fmt(info)->ops->destroy_instance(baton.fid);
|
|
return NULL;
|
|
}
|
|
|
|
if (!(vgmeta = export_vg_to_config_tree(baton.vg))) {
|
|
log_error("VG export to config tree failed");
|
|
release_vg(baton.vg);
|
|
return NULL;
|
|
}
|
|
|
|
if (!vgmeta_ret) {
|
|
vgmeta_ret = vgmeta;
|
|
} else {
|
|
if (!compare_config(vgmeta_ret->root, vgmeta->root)) {
|
|
log_error("VG metadata comparison failed");
|
|
dm_config_destroy(vgmeta);
|
|
dm_config_destroy(vgmeta_ret);
|
|
release_vg(baton.vg);
|
|
return NULL;
|
|
}
|
|
dm_config_destroy(vgmeta);
|
|
}
|
|
|
|
release_vg(baton.vg);
|
|
}
|
|
|
|
if (vgmeta_ret) {
|
|
fid = lvmcache_fmt(info)->ops->create_instance(lvmcache_fmt(info), &fic);
|
|
if (!(vg_ret = import_vg_from_config_tree(vgmeta_ret, fid))) {
|
|
log_error("VG import from config tree failed");
|
|
lvmcache_fmt(info)->ops->destroy_instance(fid);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Update lvmetad with the newly read version of the VG.
|
|
* The "precommitted" name is a misnomer in this case,
|
|
* but that is the field which lvmetad_vg_update() uses
|
|
* to send the metadata cft to lvmetad.
|
|
*/
|
|
vg_ret->cft_precommitted = vgmeta_ret;
|
|
if (!lvmetad_vg_update(vg_ret))
|
|
log_error("Failed to update lvmetad with new VG meta");
|
|
vg_ret->cft_precommitted = NULL;
|
|
dm_config_destroy(vgmeta_ret);
|
|
}
|
|
out:
|
|
return vg_ret;
|
|
}
|
|
|
|
int lvmetad_pvscan_single(struct cmd_context *cmd, struct device *dev,
|
|
activation_handler handler, int ignore_obsolete)
|
|
{
|
|
struct label *label;
|
|
struct lvmcache_info *info;
|
|
struct _lvmetad_pvscan_baton baton;
|
|
/* Create a dummy instance. */
|
|
struct format_instance_ctx fic = { .type = 0 };
|
|
|
|
if (!lvmetad_active()) {
|
|
log_error("Cannot proceed since lvmetad is not active.");
|
|
return 0;
|
|
}
|
|
|
|
if (!label_read(dev, &label, 0)) {
|
|
log_print_unless_silent("No PV label found on %s.", dev_name(dev));
|
|
if (!lvmetad_pv_gone_by_dev(dev, handler))
|
|
goto_bad;
|
|
return 1;
|
|
}
|
|
|
|
info = (struct lvmcache_info *) label->info;
|
|
|
|
baton.vg = NULL;
|
|
baton.fid = lvmcache_fmt(info)->ops->create_instance(lvmcache_fmt(info), &fic);
|
|
|
|
if (!baton.fid)
|
|
goto_bad;
|
|
|
|
if (baton.fid->fmt->features & FMT_OBSOLETE) {
|
|
if (ignore_obsolete)
|
|
log_warn("WARNING: Ignoring obsolete format of metadata (%s) on device %s when using lvmetad",
|
|
baton.fid->fmt->name, dev_name(dev));
|
|
else
|
|
log_error("WARNING: Ignoring obsolete format of metadata (%s) on device %s when using lvmetad",
|
|
baton.fid->fmt->name, dev_name(dev));
|
|
lvmcache_fmt(info)->ops->destroy_instance(baton.fid);
|
|
|
|
if (ignore_obsolete)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
lvmcache_foreach_mda(info, _lvmetad_pvscan_single, &baton);
|
|
|
|
/*
|
|
* LVM1 VGs have no MDAs and lvmcache_foreach_mda isn't worth fixing
|
|
* to use pseudo-mdas for PVs.
|
|
* Note that the single_device parameter also gets ignored and this code
|
|
* can scan further devices.
|
|
*/
|
|
if (!baton.vg && !(baton.fid->fmt->features & FMT_MDAS))
|
|
baton.vg = ((struct metadata_area *) dm_list_first(&baton.fid->metadata_areas_in_use))->ops->vg_read(baton.fid, lvmcache_vgname_from_info(info), NULL, NULL, NULL, 1);
|
|
|
|
if (!baton.vg)
|
|
lvmcache_fmt(info)->ops->destroy_instance(baton.fid);
|
|
|
|
/*
|
|
* NB. If this command failed and we are relying on lvmetad to have an
|
|
* *exact* image of the system, the lvmetad instance that went out of
|
|
* sync needs to be killed.
|
|
*/
|
|
if (!lvmetad_pv_found((const struct id *) &dev->pvid, dev, lvmcache_fmt(info),
|
|
label->sector, baton.vg, handler)) {
|
|
release_vg(baton.vg);
|
|
goto_bad;
|
|
}
|
|
|
|
release_vg(baton.vg);
|
|
return 1;
|
|
|
|
bad:
|
|
/* FIXME kill lvmetad automatically if we can */
|
|
log_error("Update of lvmetad failed. This is a serious problem.\n "
|
|
"It is strongly recommended that you restart lvmetad immediately.");
|
|
return 0;
|
|
}
|
|
|
|
static int _lvmetad_pvscan_all_devs(struct cmd_context *cmd, activation_handler handler,
|
|
int ignore_obsolete)
|
|
{
|
|
struct dev_iter *iter;
|
|
struct device *dev;
|
|
daemon_reply reply;
|
|
int r = 1;
|
|
char *future_token;
|
|
int was_silent;
|
|
|
|
if (!lvmetad_active()) {
|
|
log_error("Cannot proceed since lvmetad is not active.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(iter = dev_iter_create(cmd->lvmetad_filter, 1))) {
|
|
log_error("dev_iter creation failed");
|
|
return 0;
|
|
}
|
|
|
|
future_token = _lvmetad_token;
|
|
_lvmetad_token = (char *) "update in progress";
|
|
if (!_token_update()) {
|
|
dev_iter_destroy(iter);
|
|
_lvmetad_token = future_token;
|
|
return 0;
|
|
}
|
|
|
|
log_debug_lvmetad("Telling lvmetad to clear its cache");
|
|
reply = _lvmetad_send("pv_clear_all", NULL);
|
|
if (!_lvmetad_handle_reply(reply, "clear info about all PVs", "", NULL))
|
|
r = 0;
|
|
daemon_reply_destroy(reply);
|
|
|
|
was_silent = silent_mode();
|
|
init_silent(1);
|
|
|
|
while ((dev = dev_iter_get(iter))) {
|
|
if (sigint_caught()) {
|
|
r = 0;
|
|
stack;
|
|
break;
|
|
}
|
|
if (!lvmetad_pvscan_single(cmd, dev, handler, ignore_obsolete))
|
|
r = 0;
|
|
}
|
|
|
|
init_silent(was_silent);
|
|
|
|
dev_iter_destroy(iter);
|
|
|
|
_lvmetad_token = future_token;
|
|
if (!_token_update())
|
|
return 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
int lvmetad_pvscan_all_devs(struct cmd_context *cmd, activation_handler handler)
|
|
{
|
|
return _lvmetad_pvscan_all_devs(cmd, handler, 0);
|
|
}
|
|
|
|
/*
|
|
* FIXME Implement this function, skipping PVs known to belong to local or clustered,
|
|
* non-exported VGs.
|
|
*/
|
|
int lvmetad_pvscan_foreign_vgs(struct cmd_context *cmd, activation_handler handler)
|
|
{
|
|
return _lvmetad_pvscan_all_devs(cmd, handler, 1);
|
|
}
|
|
|
|
int lvmetad_vg_clear_outdated_pvs(struct volume_group *vg)
|
|
{
|
|
char uuid[64];
|
|
daemon_reply reply;
|
|
int result;
|
|
|
|
if (!id_write_format(&vg->id, uuid, sizeof(uuid)))
|
|
return_0;
|
|
|
|
reply = _lvmetad_send("vg_clear_outdated_pvs", "vgid = %s", uuid, NULL);
|
|
result = _lvmetad_handle_reply(reply, "clear the list of outdated PVs", vg->name, NULL);
|
|
daemon_reply_destroy(reply);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Records the state of cached PVs in lvmetad so we can look for changes
|
|
* after rescanning.
|
|
*/
|
|
struct pv_cache_list {
|
|
struct dm_list list;
|
|
dev_t devt;
|
|
struct id pvid;
|
|
const char *vgid;
|
|
unsigned found : 1;
|
|
unsigned update_udev : 1;
|
|
};
|
|
|
|
/*
|
|
* Get the list of PVs known to lvmetad.
|
|
*/
|
|
static int _lvmetad_get_pv_cache_list(struct cmd_context *cmd, struct dm_list *pvc_list)
|
|
{
|
|
daemon_reply reply;
|
|
struct dm_config_node *cn;
|
|
struct pv_cache_list *pvcl;
|
|
const char *pvid_txt;
|
|
const char *vgid;
|
|
|
|
if (!lvmetad_active())
|
|
return 1;
|
|
|
|
log_debug_lvmetad("Asking lvmetad for complete list of known PVs");
|
|
reply = _lvmetad_send("pv_list", NULL);
|
|
if (!_lvmetad_handle_reply(reply, "list PVs", "", NULL)) {
|
|
log_error("lvmetad message failed.");
|
|
daemon_reply_destroy(reply);
|
|
return_0;
|
|
}
|
|
|
|
if ((cn = dm_config_find_node(reply.cft->root, "physical_volumes"))) {
|
|
for (cn = cn->child; cn; cn = cn->sib) {
|
|
if (!(pvcl = dm_pool_zalloc(cmd->mem, sizeof(*pvcl)))) {
|
|
log_error("pv_cache_list allocation failed.");
|
|
return 0;
|
|
}
|
|
|
|
pvid_txt = cn->key;
|
|
if (!id_read_format(&pvcl->pvid, pvid_txt)) {
|
|
stack;
|
|
continue;
|
|
}
|
|
|
|
pvcl->devt = dm_config_find_int(cn->child, "device", 0);
|
|
|
|
if ((vgid = dm_config_find_str(cn->child, "vgid", NULL)))
|
|
pvcl->vgid = dm_pool_strdup(cmd->mem, vgid);
|
|
|
|
dm_list_add(pvc_list, &pvcl->list);
|
|
}
|
|
}
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Opening the device RDWR should trigger a udev db update.
|
|
* FIXME: is there a better way to update the udev db than
|
|
* doing an open/close of the device?
|
|
*/
|
|
static void _update_pv_in_udev(struct cmd_context *cmd, dev_t devt)
|
|
{
|
|
struct device *dev;
|
|
|
|
log_debug_devs("device %d:%d open to update udev",
|
|
(int)MAJOR(devt), (int)MINOR(devt));
|
|
|
|
if (!(dev = dev_cache_get_by_devt(devt, cmd->lvmetad_filter))) {
|
|
log_error("_update_pv_in_udev no dev found");
|
|
return;
|
|
}
|
|
|
|
if (!dev_open(dev))
|
|
return;
|
|
dev_close(dev);
|
|
}
|
|
|
|
/*
|
|
* Compare before and after PV lists from before/after rescanning,
|
|
* and update udev db for changes.
|
|
*
|
|
* For PVs that have changed pvid or vgid in lvmetad from rescanning,
|
|
* there may be information in the udev database to update, so open
|
|
* these devices to trigger a udev update.
|
|
*
|
|
* "before" refers to the list of pvs from lvmetad before rescanning
|
|
* "after" refers to the list of pvs from lvmetad after rescanning
|
|
*
|
|
* Comparing both lists, we can see which PVs changed (pvid or vgid),
|
|
* and trigger a udev db update for those.
|
|
*/
|
|
static void _update_changed_pvs_in_udev(struct cmd_context *cmd,
|
|
struct dm_list *pvc_before,
|
|
struct dm_list *pvc_after)
|
|
{
|
|
struct pv_cache_list *before;
|
|
struct pv_cache_list *after;
|
|
char id_before[ID_LEN + 1] __attribute__((aligned(8)));
|
|
char id_after[ID_LEN + 1] __attribute__((aligned(8)));
|
|
int found;
|
|
|
|
dm_list_iterate_items(before, pvc_before) {
|
|
found = 0;
|
|
|
|
dm_list_iterate_items(after, pvc_after) {
|
|
if (after->found)
|
|
continue;
|
|
|
|
if (before->devt != after->devt)
|
|
continue;
|
|
|
|
if (!id_equal(&before->pvid, &after->pvid)) {
|
|
memset(id_before, 0, sizeof(id_before));
|
|
memset(id_after, 0, sizeof(id_after));
|
|
strncpy(&id_before[0], (char *) &before->pvid, sizeof(id_before) - 1);
|
|
strncpy(&id_after[0], (char *) &after->pvid, sizeof(id_after) - 1);
|
|
|
|
log_debug_devs("device %d:%d changed pvid from %s to %s",
|
|
(int)MAJOR(before->devt), (int)MINOR(before->devt),
|
|
id_before, id_after);
|
|
|
|
before->update_udev = 1;
|
|
|
|
} else if ((before->vgid && !after->vgid) ||
|
|
(after->vgid && !before->vgid) ||
|
|
(before->vgid && after->vgid && strcmp(before->vgid, after->vgid))) {
|
|
|
|
log_debug_devs("device %d:%d changed vg from %s to %s",
|
|
(int)MAJOR(before->devt), (int)MINOR(before->devt),
|
|
before->vgid ?: "none", after->vgid ?: "none");
|
|
|
|
before->update_udev = 1;
|
|
}
|
|
|
|
after->found = 1;
|
|
before->found = 1;
|
|
found = 1;
|
|
break;
|
|
}
|
|
|
|
if (!found) {
|
|
memset(id_before, 0, sizeof(id_before));
|
|
strncpy(&id_before[0], (char *) &before->pvid, sizeof(id_before) - 1);
|
|
|
|
log_debug_devs("device %d:%d pvid %s vg %s is gone",
|
|
(int)MAJOR(before->devt), (int)MINOR(before->devt),
|
|
id_before, before->vgid ? before->vgid : "none");
|
|
|
|
before->update_udev = 1;
|
|
}
|
|
}
|
|
|
|
dm_list_iterate_items(before, pvc_before) {
|
|
if (before->update_udev)
|
|
_update_pv_in_udev(cmd, before->devt);
|
|
}
|
|
|
|
dm_list_iterate_items(after, pvc_after) {
|
|
if (after->update_udev)
|
|
_update_pv_in_udev(cmd, after->devt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Before this command was run, some external entity may have
|
|
* invalidated lvmetad's cache of global information, e.g. lvmlockd.
|
|
*
|
|
* The global information includes things like a new VG, a
|
|
* VG that was removed, the assignment of a PV to a VG;
|
|
* any change that is not isolated within a single VG.
|
|
*
|
|
* The external entity, like a lock manager, would invalidate
|
|
* the lvmetad global cache if it detected that the global
|
|
* information had been changed on disk by something other
|
|
* than a local lvm command, e.g. an lvm command on another
|
|
* host with access to the same devices. (How it detects
|
|
* the change is specific to lock manager or other entity.)
|
|
*
|
|
* The effect is that metadata on disk is newer than the metadata
|
|
* in the local lvmetad daemon, and the local lvmetad's cache
|
|
* should be updated from disk before this command uses it.
|
|
*
|
|
* So, using this function, a command checks if lvmetad's global
|
|
* cache is valid. If so, it does nothing. If not, it rescans
|
|
* devices to update the lvmetad cache, then it notifies lvmetad
|
|
* that it's cache is valid again (consistent with what's on disk.)
|
|
* This command can then go ahead and use the newly refreshed metadata.
|
|
*
|
|
* 1. Check if the lvmetad global cache is invalid.
|
|
* 2. If so, reread metadata from all devices and update the lvmetad cache.
|
|
* 3. Tell lvmetad that the global cache is now valid.
|
|
*/
|
|
|
|
void lvmetad_validate_global_cache(struct cmd_context *cmd, int force)
|
|
{
|
|
struct dm_list pvc_before; /* pv_cache_list */
|
|
struct dm_list pvc_after; /* pv_cache_list */
|
|
daemon_reply reply;
|
|
int global_invalid;
|
|
|
|
dm_list_init(&pvc_before);
|
|
dm_list_init(&pvc_after);
|
|
|
|
if (!lvmetad_used())
|
|
return;
|
|
|
|
if (force)
|
|
goto do_scan;
|
|
|
|
reply = daemon_send_simple(_lvmetad, "get_global_info",
|
|
"token = %s", "skip",
|
|
NULL);
|
|
|
|
if (reply.error) {
|
|
log_error("lvmetad_validate_global_cache get_global_info error %d", reply.error);
|
|
goto do_scan;
|
|
}
|
|
|
|
if (strcmp(daemon_reply_str(reply, "response", ""), "OK")) {
|
|
log_error("lvmetad_validate_global_cache get_global_info not ok");
|
|
goto do_scan;
|
|
}
|
|
|
|
global_invalid = daemon_reply_int(reply, "global_invalid", -1);
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
if (!global_invalid) {
|
|
/* cache is valid */
|
|
return;
|
|
}
|
|
|
|
do_scan:
|
|
/*
|
|
* Save the current state of pvs from lvmetad so after devices are
|
|
* scanned, we can compare to the new state to see if pvs changed.
|
|
*/
|
|
_lvmetad_get_pv_cache_list(cmd, &pvc_before);
|
|
|
|
/*
|
|
* Update the local lvmetad cache so it correctly reflects any
|
|
* changes made on remote hosts.
|
|
*/
|
|
lvmetad_pvscan_all_devs(cmd, NULL);
|
|
|
|
/*
|
|
* Clear the global_invalid flag in lvmetad.
|
|
* Subsequent local commands that read global state
|
|
* from lvmetad will not see global_invalid until
|
|
* another host makes another global change.
|
|
*/
|
|
reply = daemon_send_simple(_lvmetad, "set_global_info",
|
|
"token = %s", "skip",
|
|
"global_invalid = %d", 0,
|
|
NULL);
|
|
if (reply.error)
|
|
log_error("lvmetad_validate_global_cache set_global_info error %d", reply.error);
|
|
|
|
if (strcmp(daemon_reply_str(reply, "response", ""), "OK"))
|
|
log_error("lvmetad_validate_global_cache set_global_info not ok");
|
|
|
|
daemon_reply_destroy(reply);
|
|
|
|
/*
|
|
* Populate this command's lvmcache structures from lvmetad.
|
|
*/
|
|
lvmcache_seed_infos_from_lvmetad(cmd);
|
|
|
|
/*
|
|
* Update the local udev database to reflect PV changes from
|
|
* other hosts.
|
|
*
|
|
* Compare the before and after PV lists, and if a PV's
|
|
* pvid or vgid has changed, then open that device to trigger
|
|
* a uevent to update the udev db.
|
|
*
|
|
* This has no direct benefit to lvm, but is just a best effort
|
|
* attempt to keep the udev db updated and reflecting current
|
|
* lvm information.
|
|
*
|
|
* FIXME: lvmcache_seed_infos_from_lvmetad() and _lvmetad_get_pv_cache_list()
|
|
* each get pv_list from lvmetad, and they could share a single pv_list reply.
|
|
*/
|
|
if (!dm_list_empty(&pvc_before)) {
|
|
_lvmetad_get_pv_cache_list(cmd, &pvc_after);
|
|
_update_changed_pvs_in_udev(cmd, &pvc_before, &pvc_after);
|
|
}
|
|
}
|