1 /* $NetBSD: pvmove.c,v 1.1.1.2 2009/12/02 00:25:54 haad Exp $ */
4 * Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
5 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
7 * This file is part of LVM2.
9 * This copyrighted material is made available to anyone wishing to use,
10 * modify, copy, or redistribute it subject to the terms and conditions
11 * of the GNU Lesser General Public License v.2.1.
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include "polldaemon.h"
22 #define PVMOVE_FIRST_TIME 0x00000001 /* Called for first time */
24 static int _pvmove_target_present(struct cmd_context *cmd, int clustered)
26 const struct segment_type *segtype;
29 static int _clustered_found = -1;
31 if (clustered && _clustered_found >= 0)
32 return _clustered_found;
34 if (!(segtype = get_segtype_from_string(cmd, "mirror")))
37 if (activation() && segtype->ops->target_present &&
38 !segtype->ops->target_present(cmd, NULL, clustered ? &attr : NULL))
41 if (activation() && clustered) {
42 if (found && (attr & MIRROR_LOG_CLUSTERED))
43 _clustered_found = found = 1;
45 _clustered_found = found = 0;
51 static unsigned _pvmove_is_exclusive(struct cmd_context *cmd,
52 struct volume_group *vg)
54 if (vg_is_clustered(vg))
55 if (!_pvmove_target_present(cmd, 1))
61 /* Allow /dev/vgname/lvname, vgname/lvname or lvname */
62 static const char *_extract_lvname(struct cmd_context *cmd, const char *vgname,
67 /* Is an lvname supplied directly? */
68 if (!strchr(arg, '/'))
71 lvname = skip_dev_dir(cmd, arg, NULL);
72 while (*lvname == '/')
74 if (!strchr(lvname, '/')) {
75 log_error("--name takes a logical volume name");
78 if (strncmp(vgname, lvname, strlen(vgname)) ||
79 (lvname += strlen(vgname), *lvname != '/')) {
80 log_error("Named LV and old PV must be in the same VG");
83 while (*lvname == '/')
86 log_error("Incomplete LV name supplied with --name");
92 static struct volume_group *_get_vg(struct cmd_context *cmd, const char *vgname)
96 return vg_read_for_update(cmd, vgname, NULL, 0);
99 /* Create list of PVs for allocation of replacement extents */
100 static struct dm_list *_get_allocatable_pvs(struct cmd_context *cmd, int argc,
101 char **argv, struct volume_group *vg,
102 struct physical_volume *pv,
103 alloc_policy_t alloc)
105 struct dm_list *allocatable_pvs, *pvht, *pvh;
109 allocatable_pvs = create_pv_list(cmd->mem, vg, argc, argv, 1);
111 allocatable_pvs = clone_pv_list(cmd->mem, &vg->pvs);
113 if (!allocatable_pvs)
116 dm_list_iterate_safe(pvh, pvht, allocatable_pvs) {
117 pvl = dm_list_item(pvh, struct pv_list);
119 /* Don't allocate onto the PV we're clearing! */
120 if ((alloc != ALLOC_ANYWHERE) && (pvl->pv->dev == pv_dev(pv))) {
121 dm_list_del(&pvl->list);
125 /* Remove PV if full */
126 if ((pvl->pv->pe_count == pvl->pv->pe_alloc_count))
127 dm_list_del(&pvl->list);
130 if (dm_list_empty(allocatable_pvs)) {
131 log_error("No extents available for allocation");
135 return allocatable_pvs;
139 * Replace any LV segments on given PV with temporary mirror.
140 * Returns list of LVs changed.
142 static int _insert_pvmove_mirrors(struct cmd_context *cmd,
143 struct logical_volume *lv_mirr,
144 struct dm_list *source_pvl,
145 struct logical_volume *lv,
146 struct dm_list *lvs_changed)
150 uint32_t prev_le_count;
152 /* Only 1 PV may feature in source_pvl */
153 pvl = dm_list_item(source_pvl->n, struct pv_list);
155 prev_le_count = lv_mirr->le_count;
156 if (!insert_layer_for_segments_on_pv(cmd, lv, lv_mirr, PVMOVE,
160 /* check if layer was inserted */
161 if (lv_mirr->le_count - prev_le_count) {
162 lv->status |= LOCKED;
164 log_verbose("Moving %u extents of logical volume %s/%s",
165 lv_mirr->le_count - prev_le_count,
166 lv->vg->name, lv->name);
172 /* Create new LV with mirror segments for the required copies */
173 static struct logical_volume *_set_up_pvmove_lv(struct cmd_context *cmd,
174 struct volume_group *vg,
175 struct dm_list *source_pvl,
177 struct dm_list *allocatable_pvs,
178 alloc_policy_t alloc,
179 struct dm_list **lvs_changed)
181 struct logical_volume *lv_mirr, *lv;
183 uint32_t log_count = 0;
186 /* FIXME Cope with non-contiguous => splitting existing segments */
187 if (!(lv_mirr = lv_create_empty("pvmove%d", NULL,
188 LVM_READ | LVM_WRITE,
189 ALLOC_CONTIGUOUS, vg))) {
190 log_error("Creation of temporary pvmove LV failed");
194 lv_mirr->status |= (PVMOVE | LOCKED);
196 if (!(*lvs_changed = dm_pool_alloc(cmd->mem, sizeof(**lvs_changed)))) {
197 log_error("lvs_changed list struct allocation failed");
201 dm_list_init(*lvs_changed);
203 /* Find segments to be moved and set up mirrors */
204 dm_list_iterate_items(lvl, &vg->lvs) {
209 if (strcmp(lv->name, lv_name))
213 if (lv_is_origin(lv) || lv_is_cow(lv)) {
214 log_print("Skipping snapshot-related LV %s", lv->name);
217 if (lv->status & MIRRORED) {
218 log_print("Skipping mirror LV %s", lv->name);
221 if (lv->status & MIRROR_LOG) {
222 log_print("Skipping mirror log LV %s", lv->name);
225 if (lv->status & MIRROR_IMAGE) {
226 log_print("Skipping mirror image LV %s", lv->name);
229 if (lv->status & LOCKED) {
230 log_print("Skipping locked LV %s", lv->name);
233 if (!_insert_pvmove_mirrors(cmd, lv_mirr, source_pvl, lv,
238 if (lv_name && !lv_found) {
239 log_error("Logical volume %s not found.", lv_name);
243 /* Is temporary mirror empty? */
244 if (!lv_mirr->le_count) {
245 log_error("No data to move for %s", vg->name);
249 if (!lv_add_mirrors(cmd, lv_mirr, 1, 1, 0, log_count,
250 allocatable_pvs, alloc, MIRROR_BY_SEG)) {
251 log_error("Failed to convert pvmove LV to mirrored");
255 if (!split_parent_segments_for_layer(cmd, lv_mirr)) {
256 log_error("Failed to split segments being moved");
263 static int _activate_lv(struct cmd_context *cmd, struct logical_volume *lv_mirr,
267 return activate_lv_excl(cmd, lv_mirr);
269 return activate_lv(cmd, lv_mirr);
272 static int _finish_pvmove(struct cmd_context *cmd, struct volume_group *vg,
273 struct logical_volume *lv_mirr,
274 struct dm_list *lvs_changed);
276 static int _update_metadata(struct cmd_context *cmd, struct volume_group *vg,
277 struct logical_volume *lv_mirr,
278 struct dm_list *lvs_changed, unsigned flags)
280 unsigned exclusive = _pvmove_is_exclusive(cmd, vg);
281 unsigned first_time = (flags & PVMOVE_FIRST_TIME) ? 1 : 0;
284 log_verbose("Updating volume group metadata");
286 log_error("ABORTING: Volume group metadata update failed.");
290 /* Suspend lvs_changed */
291 if (!suspend_lvs(cmd, lvs_changed))
294 /* Suspend mirrors on subsequent calls */
296 if (!suspend_lv(cmd, lv_mirr)) {
297 resume_lvs(cmd, lvs_changed);
303 /* Commit on-disk metadata */
304 if (!vg_commit(vg)) {
305 log_error("ABORTING: Volume group metadata update failed.");
307 resume_lv(cmd, lv_mirr);
308 resume_lvs(cmd, lvs_changed);
312 /* Activate the temporary mirror LV */
313 /* Only the first mirror segment gets activated as a mirror */
314 /* FIXME: Add option to use a log */
316 if (!_activate_lv(cmd, lv_mirr, exclusive)) {
321 * Nothing changed yet, try to revert pvmove.
323 log_error("Temporary pvmove mirror activation failed.");
324 if (!_finish_pvmove(cmd, vg, lv_mirr, lvs_changed))
325 log_error("ABORTING: Restoring original configuration "
326 "before pvmove failed. Run pvmove --abort.");
329 } else if (!resume_lv(cmd, lv_mirr)) {
330 log_error("Unable to reactivate logical volume \"%s\"",
332 resume_lvs(cmd, lvs_changed);
337 if (!resume_lvs(cmd, lvs_changed)) {
338 log_error("Unable to resume logical volumes");
348 static int _set_up_pvmove(struct cmd_context *cmd, const char *pv_name,
349 int argc, char **argv)
351 const char *lv_name = NULL;
353 struct volume_group *vg;
354 struct dm_list *source_pvl;
355 struct dm_list *allocatable_pvs;
356 alloc_policy_t alloc;
357 struct dm_list *lvs_changed;
358 struct physical_volume *pv;
359 struct logical_volume *lv_mirr;
360 unsigned first_time = 1;
364 pv_name_arg = argv[0];
368 /* Find PV (in VG) */
369 if (!(pv = find_pv_by_name(cmd, pv_name))) {
371 return EINVALID_CMD_LINE;
374 if (arg_count(cmd, name_ARG)) {
375 if (!(lv_name = _extract_lvname(cmd, pv_vg_name(pv),
376 arg_value(cmd, name_ARG)))) {
378 return EINVALID_CMD_LINE;
381 if (!validate_name(lv_name)) {
382 log_error("Logical volume name %s is invalid", lv_name);
383 return EINVALID_CMD_LINE;
388 log_verbose("Finding volume group \"%s\"", pv_vg_name(pv));
390 vg = _get_vg(cmd, pv_vg_name(pv));
391 if (vg_read_error(vg)) {
397 exclusive = _pvmove_is_exclusive(cmd, vg);
399 if ((lv_mirr = find_pvmove_lv(vg, pv_dev(pv), PVMOVE))) {
400 log_print("Detected pvmove in progress for %s", pv_name);
402 log_error("Ignoring remaining command line arguments");
404 if (!(lvs_changed = lvs_using_lv(cmd, vg, lv_mirr))) {
405 log_error("ABORTING: Failed to generate list of moving LVs");
409 /* Ensure mirror LV is active */
410 if (!_activate_lv(cmd, lv_mirr, exclusive)) {
411 log_error("ABORTING: Temporary mirror activation failed.");
417 /* Determine PE ranges to be moved */
418 if (!(source_pvl = create_pv_list(cmd->mem, vg, 1,
422 alloc = arg_uint_value(cmd, alloc_ARG, ALLOC_INHERIT);
423 if (alloc == ALLOC_INHERIT)
426 /* Get PVs we can use for allocation */
427 if (!(allocatable_pvs = _get_allocatable_pvs(cmd, argc, argv,
434 if (!(lv_mirr = _set_up_pvmove_lv(cmd, vg, source_pvl, lv_name,
435 allocatable_pvs, alloc,
440 /* Lock lvs_changed and activate (with old metadata) */
441 if (!activate_lvs(cmd, lvs_changed, exclusive))
444 /* FIXME Presence of a mirror once set PVMOVE - now remove associated logic */
445 /* init_pvmove(1); */
446 /* vg->status |= PVMOVE; */
449 if (!_update_metadata
450 (cmd, vg, lv_mirr, lvs_changed, PVMOVE_FIRST_TIME))
454 /* LVs are all in status LOCKED */
457 unlock_and_release_vg(cmd, vg, pv_vg_name(pv));
461 static int _finish_pvmove(struct cmd_context *cmd, struct volume_group *vg,
462 struct logical_volume *lv_mirr,
463 struct dm_list *lvs_changed)
466 struct dm_list lvs_completed;
469 /* Update metadata to remove mirror segments and break dependencies */
470 dm_list_init(&lvs_completed);
471 if (!lv_remove_mirrors(cmd, lv_mirr, 1, 0, NULL, PVMOVE) ||
472 !remove_layers_for_segments_all(cmd, lv_mirr, PVMOVE,
474 log_error("ABORTING: Removal of temporary mirror failed");
478 dm_list_iterate_items(lvl, &lvs_completed)
479 /* FIXME Assumes only one pvmove at a time! */
480 lvl->lv->status &= ~LOCKED;
482 /* Store metadata without dependencies on mirror segments */
484 log_error("ABORTING: Failed to write new data locations "
489 /* Suspend LVs changed */
490 if (!suspend_lvs(cmd, lvs_changed)) {
491 log_error("Locking LVs to remove temporary mirror failed");
495 /* Suspend mirror LV to flush pending I/O */
496 if (!suspend_lv(cmd, lv_mirr)) {
497 log_error("Suspension of temporary mirror LV failed");
501 /* Store metadata without dependencies on mirror segments */
502 if (!vg_commit(vg)) {
503 log_error("ABORTING: Failed to write new data locations "
506 resume_lv(cmd, lv_mirr);
507 resume_lvs(cmd, lvs_changed);
511 /* Release mirror LV. (No pending I/O because it's been suspended.) */
512 if (!resume_lv(cmd, lv_mirr)) {
513 log_error("Unable to reactivate logical volume \"%s\"",
519 resume_lvs(cmd, lvs_changed);
521 /* Deactivate mirror LV */
522 if (!deactivate_lv(cmd, lv_mirr)) {
523 log_error("ABORTING: Unable to deactivate temporary logical "
524 "volume \"%s\"", lv_mirr->name);
528 log_verbose("Removing temporary pvmove LV");
529 if (!lv_remove(lv_mirr)) {
530 log_error("ABORTING: Removal of temporary pvmove LV failed");
534 /* Store it on disks */
535 log_verbose("Writing out final volume group after pvmove");
536 if (!vg_write(vg) || !vg_commit(vg)) {
537 log_error("ABORTING: Failed to write new data locations "
542 /* FIXME backup positioning */
548 static struct volume_group *_get_move_vg(struct cmd_context *cmd,
549 const char *name, const char *uuid)
551 struct physical_volume *pv;
553 /* Reread all metadata in case it got changed */
554 if (!(pv = find_pv_by_name(cmd, name))) {
555 log_error("ABORTING: Can't reread PV %s", name);
556 /* What more could we do here? */
560 return _get_vg(cmd, pv_vg_name(pv));
563 static struct poll_functions _pvmove_fns = {
564 .get_copy_name_from_lv = get_pvmove_pvname_from_lv_mirr,
565 .get_copy_vg = _get_move_vg,
566 .get_copy_lv = find_pvmove_lv_from_pvname,
567 .poll_progress = poll_mirror_progress,
568 .update_metadata = _update_metadata,
569 .finish_copy = _finish_pvmove,
572 int pvmove_poll(struct cmd_context *cmd, const char *pv_name,
575 return poll_daemon(cmd, pv_name, NULL, background, PVMOVE, &_pvmove_fns,
579 int pvmove(struct cmd_context *cmd, int argc, char **argv)
581 char *pv_name = NULL;
585 /* dm raid1 target must be present in every case */
586 if (!_pvmove_target_present(cmd, 0)) {
587 log_error("Required device-mapper target(s) not "
588 "detected in your kernel");
595 /* Drop any PE lists from PV name */
596 if ((colon = strchr(pv_name, ':'))) {
597 if (!(pv_name = dm_pool_strndup(cmd->mem, pv_name,
600 log_error("Failed to clone PV name");
605 if (!arg_count(cmd, abort_ARG) &&
606 (ret = _set_up_pvmove(cmd, pv_name, argc, argv)) !=
613 return pvmove_poll(cmd, pv_name, arg_is_set(cmd, background_ARG));