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lvm2/lib/activate/dev_manager.c
Alasdair Kergon b5750a61f1 Fix conditions using no_merging: only those using lv_is_merging_cow() should 
have been converted, not pure lv_is_cow ones.
(Merging has no impact on how the pre-merged cow segment itself is loaded.)
2011-07-05 01:01:19 +00:00

1871 lines
48 KiB
C
Raw Blame History

/*
* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "str_list.h"
#include "dev_manager.h"
#include "lvm-string.h"
#include "fs.h"
#include "defaults.h"
#include "segtype.h"
#include "display.h"
#include "toolcontext.h"
#include "targets.h"
#include "config.h"
#include "filter.h"
#include "activate.h"
#include <limits.h>
#include <dirent.h>
#define MAX_TARGET_PARAMSIZE 50000
typedef enum {
PRELOAD,
ACTIVATE,
DEACTIVATE,
SUSPEND,
SUSPEND_WITH_LOCKFS,
CLEAN
} action_t;
struct dev_manager {
struct dm_pool *mem;
struct cmd_context *cmd;
void *target_state;
uint32_t pvmove_mirror_count;
int flush_required;
unsigned track_pvmove_deps;
char *vg_name;
};
struct lv_layer {
struct logical_volume *lv;
const char *old_name;
};
static int _read_only_lv(struct logical_volume *lv)
{
return (!(lv->vg->status & LVM_WRITE) || !(lv->status & LVM_WRITE));
}
/*
* Low level device-layer operations.
*/
static struct dm_task *_setup_task(const char *name, const char *uuid,
uint32_t *event_nr, int task,
uint32_t major, uint32_t minor)
{
struct dm_task *dmt;
if (!(dmt = dm_task_create(task)))
return_NULL;
if (name && !dm_task_set_name(dmt, name))
goto_out;
if (uuid && *uuid && !dm_task_set_uuid(dmt, uuid))
goto_out;
if (event_nr && !dm_task_set_event_nr(dmt, *event_nr))
goto_out;
if (major && !dm_task_set_major_minor(dmt, major, minor, 1))
goto_out;
if (activation_checks() && !dm_task_enable_checks(dmt))
goto_out;
return dmt;
out:
dm_task_destroy(dmt);
return NULL;
}
static int _info_run(const char *name, const char *dlid, struct dm_info *info,
uint32_t *read_ahead, int mknodes, int with_open_count,
int with_read_ahead, uint32_t major, uint32_t minor)
{
int r = 0;
struct dm_task *dmt;
int dmtask;
dmtask = mknodes ? DM_DEVICE_MKNODES : DM_DEVICE_INFO;
if (!(dmt = _setup_task(mknodes ? name : NULL, dlid, 0, dmtask, major, minor)))
return_0;
if (!with_open_count)
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, info))
goto_out;
if (with_read_ahead && info->exists) {
if (!dm_task_get_read_ahead(dmt, read_ahead))
goto_out;
} else if (read_ahead)
*read_ahead = DM_READ_AHEAD_NONE;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int device_is_usable(struct device *dev)
{
struct dm_task *dmt;
struct dm_info info;
const char *name, *uuid;
uint64_t start, length;
char *target_type = NULL;
char *params, *vgname = NULL, *lvname, *layer;
void *next = NULL;
int only_error_target = 1;
int r = 0;
if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
return_0;
if (!dm_task_set_major_minor(dmt, MAJOR(dev->dev), MINOR(dev->dev), 1))
goto_out;
if (activation_checks() && !dm_task_enable_checks(dmt))
goto_out;
if (!dm_task_run(dmt)) {
log_error("Failed to get state of mapped device");
goto out;
}
if (!dm_task_get_info(dmt, &info))
goto_out;
if (!info.exists)
goto out;
name = dm_task_get_name(dmt);
uuid = dm_task_get_uuid(dmt);
if (!info.target_count) {
log_debug("%s: Empty device %s not usable.", dev_name(dev), name);
goto out;
}
if (info.suspended && ignore_suspended_devices()) {
log_debug("%s: Suspended device %s not usable.", dev_name(dev), name);
goto out;
}
/* FIXME Also check for mirror block_on_error and mpath no paths */
/* For now, we exclude all mirrors */
do {
next = dm_get_next_target(dmt, next, &start, &length,
&target_type, &params);
/* Skip if target type doesn't match */
if (target_type && !strcmp(target_type, "mirror") && ignore_suspended_devices()) {
log_debug("%s: Mirror device %s not usable.", dev_name(dev), name);
goto out;
}
/*
* Snapshot origin could be sitting on top of a mirror which
* could be blocking I/O. Skip snapshot origins entirely for
* now.
*
* FIXME: rather than skipping origin, check if mirror is
* underneath and if the mirror is blocking I/O.
*/
if (target_type && !strcmp(target_type, "snapshot-origin") &&
ignore_suspended_devices()) {
log_debug("%s: Snapshot-origin device %s not usable.",
dev_name(dev), name);
goto out;
}
if (target_type && strcmp(target_type, "error"))
only_error_target = 0;
} while (next);
/* Skip devices consisting entirely of error targets. */
/* FIXME Deal with device stacked above error targets? */
if (only_error_target) {
log_debug("%s: Error device %s not usable.",
dev_name(dev), name);
goto out;
}
/* FIXME Also check dependencies? */
/* Check internal lvm devices */
if (uuid && !strncmp(uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1)) {
if (!(vgname = dm_strdup(name)) ||
!dm_split_lvm_name(NULL, NULL, &vgname, &lvname, &layer))
goto_out;
if (lvname && (is_reserved_lvname(lvname) || *layer)) {
log_debug("%s: Reserved internal LV device %s/%s%s%s not usable.",
dev_name(dev), vgname, lvname, *layer ? "-" : "", layer);
goto out;
}
}
r = 1;
out:
dm_free(vgname);
dm_task_destroy(dmt);
return r;
}
static int _info(const char *dlid, int with_open_count, int with_read_ahead,
struct dm_info *info, uint32_t *read_ahead)
{
int r = 0;
if ((r = _info_run(NULL, dlid, info, read_ahead, 0, with_open_count,
with_read_ahead, 0, 0)) && info->exists)
return 1;
else if ((r = _info_run(NULL, dlid + sizeof(UUID_PREFIX) - 1, info,
read_ahead, 0, with_open_count,
with_read_ahead, 0, 0)) && info->exists)
return 1;
return r;
}
static int _info_by_dev(uint32_t major, uint32_t minor, struct dm_info *info)
{
return _info_run(NULL, NULL, info, NULL, 0, 0, 0, major, minor);
}
int dev_manager_info(struct dm_pool *mem, const struct logical_volume *lv,
const char *layer,
int with_open_count, int with_read_ahead,
struct dm_info *info, uint32_t *read_ahead)
{
char *dlid, *name;
int r;
if (!(name = build_dm_name(mem, lv->vg->name, lv->name, layer))) {
log_error("name build failed for %s", lv->name);
return 0;
}
if (!(dlid = build_dm_uuid(mem, lv->lvid.s, layer))) {
log_error("dlid build failed for %s", name);
return 0;
}
log_debug("Getting device info for %s [%s]", name, dlid);
r = _info(dlid, with_open_count, with_read_ahead, info, read_ahead);
dm_pool_free(mem, name);
return r;
}
static const struct dm_info *_cached_info(struct dm_pool *mem,
const struct logical_volume *lv,
struct dm_tree *dtree)
{
const char *dlid;
struct dm_tree_node *dnode;
const struct dm_info *dinfo;
if (!(dlid = build_dm_uuid(mem, lv->lvid.s, NULL))) {
log_error("dlid build failed for %s", lv->name);
return NULL;
}
/* An activating merging origin won't have a node in the tree yet */
if (!(dnode = dm_tree_find_node_by_uuid(dtree, dlid)))
return NULL;
if (!(dinfo = dm_tree_node_get_info(dnode))) {
log_error("failed to get info from tree node for %s", lv->name);
return NULL;
}
if (!dinfo->exists)
return NULL;
return dinfo;
}
#if 0
/* FIXME Interface must cope with multiple targets */
static int _status_run(const char *name, const char *uuid,
unsigned long long *s, unsigned long long *l,
char **t, uint32_t t_size, char **p, uint32_t p_size)
{
int r = 0;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
if (!(dmt = _setup_task(name, uuid, 0, DM_DEVICE_STATUS, 0, 0)))
return_0;
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, &info) || !info.exists)
goto_out;
do {
next = dm_get_next_target(dmt, next, &start, &length,
&type, &params);
if (type) {
*s = start;
*l = length;
/* Make sure things are null terminated */
strncpy(*t, type, t_size);
(*t)[t_size - 1] = '\0';
strncpy(*p, params, p_size);
(*p)[p_size - 1] = '\0';
r = 1;
/* FIXME Cope with multiple targets! */
break;
}
} while (next);
out:
dm_task_destroy(dmt);
return r;
}
static int _status(const char *name, const char *uuid,
unsigned long long *start, unsigned long long *length,
char **type, uint32_t type_size, char **params,
uint32_t param_size) __attribute__ ((unused));
static int _status(const char *name, const char *uuid,
unsigned long long *start, unsigned long long *length,
char **type, uint32_t type_size, char **params,
uint32_t param_size)
{
if (uuid && *uuid) {
if (_status_run(NULL, uuid, start, length, type,
type_size, params, param_size) &&
*params)
return 1;
else if (_status_run(NULL, uuid + sizeof(UUID_PREFIX) - 1, start,
length, type, type_size, params,
param_size) &&
*params)
return 1;
}
if (name && _status_run(name, NULL, start, length, type, type_size,
params, param_size))
return 1;
return 0;
}
#endif
int lv_has_target_type(struct dm_pool *mem, struct logical_volume *lv,
const char *layer, const char *target_type)
{
int r = 0;
char *dlid;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
if (!(dlid = build_dm_uuid(mem, lv->lvid.s, layer)))
return_0;
if (!(dmt = _setup_task(NULL, dlid, 0,
DM_DEVICE_STATUS, 0, 0)))
return_0;
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, &info) || !info.exists)
goto_out;
do {
next = dm_get_next_target(dmt, next, &start, &length,
&type, &params);
if (type && strncmp(type, target_type,
strlen(target_type)) == 0) {
if (info.live_table)
r = 1;
break;
}
} while (next);
out:
dm_task_destroy(dmt);
return r;
}
static percent_range_t _combine_percent(percent_t a, percent_t b,
uint32_t numerator, uint32_t denominator)
{
if (a == PERCENT_INVALID || b == PERCENT_INVALID)
return PERCENT_INVALID;
if (a == PERCENT_100 && b == PERCENT_100)
return PERCENT_100;
if (a == PERCENT_0 && b == PERCENT_0)
return PERCENT_0;
return make_percent(numerator, denominator);
}
static int _percent_run(struct dev_manager *dm, const char *name,
const char *dlid,
const char *target_type, int wait,
const struct logical_volume *lv, percent_t *overall_percent,
uint32_t *event_nr, int fail_if_percent_unsupported)
{
int r = 0;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
const struct dm_list *segh = &lv->segments;
struct lv_segment *seg = NULL;
struct segment_type *segtype;
int first_time = 1;
percent_t percent;
uint64_t total_numerator = 0, total_denominator = 0;
*overall_percent = PERCENT_INVALID;
if (!(dmt = _setup_task(name, dlid, event_nr,
wait ? DM_DEVICE_WAITEVENT : DM_DEVICE_STATUS, 0, 0)))
return_0;
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, &info) || !info.exists)
goto_out;
if (event_nr)
*event_nr = info.event_nr;
do {
next = dm_get_next_target(dmt, next, &start, &length, &type,
&params);
if (lv) {
if (!(segh = dm_list_next(&lv->segments, segh))) {
log_error("Number of segments in active LV %s "
"does not match metadata", lv->name);
goto out;
}
seg = dm_list_item(segh, struct lv_segment);
}
if (!type || !params)
continue;
if (!(segtype = get_segtype_from_string(dm->cmd, target_type)))
continue;
if (strcmp(type, target_type)) {
/* If kernel's type isn't an exact match is it compatible? */
if (!segtype->ops->target_status_compatible ||
!segtype->ops->target_status_compatible(type))
continue;
}
if (!segtype->ops->target_percent)
continue;
if (!segtype->ops->target_percent(&dm->target_state,
&percent, dm->mem,
dm->cmd, seg, params,
&total_numerator,
&total_denominator))
goto_out;
if (first_time) {
*overall_percent = percent;
first_time = 0;
} else
*overall_percent =
_combine_percent(*overall_percent, percent,
total_numerator, total_denominator);
} while (next);
if (lv && dm_list_next(&lv->segments, segh)) {
log_error("Number of segments in active LV %s does not "
"match metadata", lv->name);
goto out;
}
if (first_time) {
/* above ->target_percent() was not executed! */
/* FIXME why return PERCENT_100 et. al. in this case? */
*overall_percent = PERCENT_100;
if (fail_if_percent_unsupported)
goto_out;
}
log_debug("LV percent: %f", percent_to_float(*overall_percent));
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
static int _percent(struct dev_manager *dm, const char *name, const char *dlid,
const char *target_type, int wait,
const struct logical_volume *lv, percent_t *percent,
uint32_t *event_nr, int fail_if_percent_unsupported)
{
if (dlid && *dlid) {
if (_percent_run(dm, NULL, dlid, target_type, wait, lv, percent,
event_nr, fail_if_percent_unsupported))
return 1;
else if (_percent_run(dm, NULL, dlid + sizeof(UUID_PREFIX) - 1,
target_type, wait, lv, percent,
event_nr, fail_if_percent_unsupported))
return 1;
}
if (name && _percent_run(dm, name, NULL, target_type, wait, lv, percent,
event_nr, fail_if_percent_unsupported))
return 1;
return 0;
}
/* FIXME Merge with the percent function */
int dev_manager_transient(struct dev_manager *dm, struct logical_volume *lv)
{
int r = 0;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
char *dlid = NULL;
const char *layer = lv_is_origin(lv) ? "real" : NULL;
const struct dm_list *segh = &lv->segments;
struct lv_segment *seg = NULL;
if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, layer)))
return_0;
if (!(dmt = _setup_task(0, dlid, NULL, DM_DEVICE_STATUS, 0, 0)))
return_0;
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if (!dm_task_run(dmt))
goto_out;
if (!dm_task_get_info(dmt, &info) || !info.exists)
goto_out;
do {
next = dm_get_next_target(dmt, next, &start, &length, &type,
&params);
if (!(segh = dm_list_next(&lv->segments, segh))) {
log_error("Number of segments in active LV %s "
"does not match metadata", lv->name);
goto out;
}
seg = dm_list_item(segh, struct lv_segment);
if (!type || !params)
continue;
if (seg->segtype->ops->check_transient_status &&
!seg->segtype->ops->check_transient_status(seg, params))
goto_out;
} while (next);
if (dm_list_next(&lv->segments, segh)) {
log_error("Number of segments in active LV %s does not "
"match metadata", lv->name);
goto out;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/*
* dev_manager implementation.
*/
struct dev_manager *dev_manager_create(struct cmd_context *cmd,
const char *vg_name,
unsigned track_pvmove_deps)
{
struct dm_pool *mem;
struct dev_manager *dm;
if (!(mem = dm_pool_create("dev_manager", 16 * 1024)))
return_NULL;
if (!(dm = dm_pool_zalloc(mem, sizeof(*dm))))
goto_bad;
dm->cmd = cmd;
dm->mem = mem;
if (!(dm->vg_name = dm_pool_strdup(dm->mem, vg_name)))
goto_bad;
/*
* When we manipulate (normally suspend/resume) the PVMOVE
* device directly, there's no need to touch the LVs above.
*/
dm->track_pvmove_deps = track_pvmove_deps;
dm->target_state = NULL;
dm_udev_set_sync_support(cmd->current_settings.udev_sync);
return dm;
bad:
dm_pool_destroy(mem);
return NULL;
}
void dev_manager_destroy(struct dev_manager *dm)
{
dm_pool_destroy(dm->mem);
}
void dev_manager_release(void)
{
dm_lib_release();
}
void dev_manager_exit(void)
{
dm_lib_exit();
}
int dev_manager_snapshot_percent(struct dev_manager *dm,
const struct logical_volume *lv,
percent_t *percent)
{
char *name;
const char *dlid;
int fail_if_percent_unsupported = 0;
if (lv_is_merging_origin(lv)) {
/*
* Set 'fail_if_percent_unsupported', otherwise passing
* unsupported LV types to _percent will lead to a default
* successful return with percent_range as PERCENT_100.
* - For a merging origin, this will result in a polldaemon
* that runs infinitely (because completion is PERCENT_0)
* - We unfortunately don't yet _know_ if a snapshot-merge
* target is active (activation is deferred if dev is open);
* so we can't short-circuit origin devices based purely on
* existing LVM LV attributes.
*/
fail_if_percent_unsupported = 1;
}
/*
* Build a name for the top layer.
*/
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, NULL)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, NULL)))
return_0;
/*
* Try and get some info on this device.
*/
log_debug("Getting device status percentage for %s", name);
if (!(_percent(dm, name, dlid, "snapshot", 0, NULL, percent,
NULL, fail_if_percent_unsupported)))
return_0;
/* FIXME dm_pool_free ? */
/* If the snapshot isn't available, percent will be -1 */
return 1;
}
/* FIXME Merge with snapshot_percent, auto-detecting target type */
/* FIXME Cope with more than one target */
int dev_manager_mirror_percent(struct dev_manager *dm,
const struct logical_volume *lv, int wait,
percent_t *percent, uint32_t *event_nr)
{
char *name;
const char *dlid;
const char *layer = (lv_is_origin(lv)) ? "real" : NULL;
/*
* Build a name for the top layer.
*/
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
/* FIXME dm_pool_free ? */
if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, layer))) {
log_error("dlid build failed for %s", lv->name);
return 0;
}
log_debug("Getting device mirror status percentage for %s", name);
if (!(_percent(dm, name, dlid, "mirror", wait, lv, percent,
event_nr, 0)))
return_0;
return 1;
}
#if 0
log_very_verbose("%s %s", sus ? "Suspending" : "Resuming", name);
log_verbose("Loading %s", dl->name);
log_very_verbose("Activating %s read-only", dl->name);
log_very_verbose("Activated %s %s %03u:%03u", dl->name,
dl->dlid, dl->info.major, dl->info.minor);
if (_get_flag(dl, VISIBLE))
log_verbose("Removing %s", dl->name);
else
log_very_verbose("Removing %s", dl->name);
log_debug("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
extent_size * seg->le, extent_size * seg->len, target, params);
log_debug("Adding target: 0 %" PRIu64 " snapshot-origin %s",
dl->lv->size, params);
log_debug("Adding target: 0 %" PRIu64 " snapshot %s", size, params);
log_debug("Getting device info for %s", dl->name);
/* Rename? */
if ((suffix = strrchr(dl->dlid + sizeof(UUID_PREFIX) - 1, '-')))
suffix++;
new_name = build_dm_name(dm->mem, dm->vg_name, dl->lv->name,
suffix);
static int _belong_to_vg(const char *vgname, const char *name)
{
const char *v = vgname, *n = name;
while (*v) {
if ((*v != *n) || (*v == '-' && *(++n) != '-'))
return 0;
v++, n++;
}
if (*n == '-' && *(n + 1) != '-')
return 1;
else
return 0;
}
if (!(snap_seg = find_cow(lv)))
return 1;
old_origin = snap_seg->origin;
/* Was this the last active snapshot with this origin? */
dm_list_iterate_items(lvl, active_head) {
active = lvl->lv;
if ((snap_seg = find_cow(active)) &&
snap_seg->origin == old_origin) {
return 1;
}
}
#endif
/*************************/
/* NEW CODE STARTS HERE */
/*************************/
static int _dev_manager_lv_mknodes(const struct logical_volume *lv)
{
char *name;
if (!(name = build_dm_name(lv->vg->cmd->mem, lv->vg->name,
lv->name, NULL)))
return_0;
return fs_add_lv(lv, name);
}
static int _dev_manager_lv_rmnodes(const struct logical_volume *lv)
{
return fs_del_lv(lv);
}
int dev_manager_mknodes(const struct logical_volume *lv)
{
struct dm_info dminfo;
char *name;
int r = 0;
if (!(name = build_dm_name(lv->vg->cmd->mem, lv->vg->name, lv->name, NULL)))
return_0;
if ((r = _info_run(name, NULL, &dminfo, NULL, 1, 0, 0, 0, 0))) {
if (dminfo.exists) {
if (lv_is_visible(lv))
r = _dev_manager_lv_mknodes(lv);
} else
r = _dev_manager_lv_rmnodes(lv);
}
dm_pool_free(lv->vg->cmd->mem, name);
return r;
}
static uint16_t _get_udev_flags(struct dev_manager *dm, struct logical_volume *lv,
const char *layer)
{
uint16_t udev_flags = 0;
/*
* Instruct also libdevmapper to disable udev
* fallback in accordance to LVM2 settings.
*/
if (!dm->cmd->current_settings.udev_fallback)
udev_flags |= DM_UDEV_DISABLE_LIBRARY_FALLBACK;
/*
* Is this top-level and visible device?
* If not, create just the /dev/mapper content.
*/
if (layer || !lv_is_visible(lv))
udev_flags |= DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG |
DM_UDEV_DISABLE_DISK_RULES_FLAG |
DM_UDEV_DISABLE_OTHER_RULES_FLAG;
/*
* There's no need for other udev rules to touch special LVs with
* reserved names. We don't need to populate /dev/disk here either.
* Even if they happen to be visible and top-level.
*/
else if (is_reserved_lvname(lv->name))
udev_flags |= DM_UDEV_DISABLE_DISK_RULES_FLAG |
DM_UDEV_DISABLE_OTHER_RULES_FLAG;
/*
* Snapshots and origins could have the same rule applied that will
* give symlinks exactly the same name (e.g. a name based on
* filesystem UUID). We give preference to origins to make such
* naming deterministic (e.g. symlinks in /dev/disk/by-uuid).
*/
if (lv_is_cow(lv))
udev_flags |= DM_UDEV_LOW_PRIORITY_FLAG;
/*
* Finally, add flags to disable /dev/mapper and /dev/<vgname> content
* to be created by udev if it is requested by user's configuration.
* This is basically an explicit fallback to old node/symlink creation
* without udev.
*/
if (!dm->cmd->current_settings.udev_rules)
udev_flags |= DM_UDEV_DISABLE_DM_RULES_FLAG |
DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG;
return udev_flags;
}
static int _add_dev_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
struct logical_volume *lv, const char *layer)
{
char *dlid, *name;
struct dm_info info, info2;
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, layer)))
return_0;
log_debug("Getting device info for %s [%s]", name, dlid);
if (!_info(dlid, 1, 0, &info, NULL)) {
log_error("Failed to get info for %s [%s].", name, dlid);
return 0;
}
/*
* For top level volumes verify that existing device match
* requested major/minor and that major/minor pair is available for use
*/
if (!layer && lv->major != -1 && lv->minor != -1) {
/*
* FIXME compare info.major with lv->major if multiple major support
*/
if (info.exists && (info.minor != lv->minor)) {
log_error("Volume %s (%" PRIu32 ":%" PRIu32")"
" differs from already active device "
"(%" PRIu32 ":%" PRIu32")",
lv->name, lv->major, lv->minor, info.major, info.minor);
return 0;
}
if (!info.exists && _info_by_dev(lv->major, lv->minor, &info2) &&
info2.exists) {
log_error("The requested major:minor pair "
"(%" PRIu32 ":%" PRIu32") is already used",
lv->major, lv->minor);
return 0;
}
}
if (info.exists && !dm_tree_add_dev_with_udev_flags(dtree, info.major, info.minor,
_get_udev_flags(dm, lv, layer))) {
log_error("Failed to add device (%" PRIu32 ":%" PRIu32") to dtree",
info.major, info.minor);
return 0;
}
return 1;
}
/*
* Add replicator devices
*
* Using _add_dev_to_dtree() directly instead of _add_lv_to_dtree()
* to avoid extra checks with extensions.
*/
static int _add_partial_replicator_to_dtree(struct dev_manager *dm,
struct dm_tree *dtree,
struct logical_volume *lv)
{
struct logical_volume *rlv = first_seg(lv)->replicator;
struct replicator_device *rdev;
struct replicator_site *rsite;
struct dm_tree_node *rep_node, *rdev_node;
const char *uuid;
if (!lv_is_active_replicator_dev(lv)) {
if (!_add_dev_to_dtree(dm, dtree, lv->rdevice->lv,
NULL))
return_0;
return 1;
}
/* Add _rlog and replicator device */
if (!_add_dev_to_dtree(dm, dtree, first_seg(rlv)->rlog_lv, NULL))
return_0;
if (!_add_dev_to_dtree(dm, dtree, rlv, NULL))
return_0;
if (!(uuid = build_dm_uuid(dm->mem, rlv->lvid.s, NULL)))
return_0;
rep_node = dm_tree_find_node_by_uuid(dtree, uuid);
/* Add all related devices for replicator */
dm_list_iterate_items(rsite, &rlv->rsites)
dm_list_iterate_items(rdev, &rsite->rdevices) {
if (rsite->state == REPLICATOR_STATE_ACTIVE) {
/* Add _rimage LV */
if (!_add_dev_to_dtree(dm, dtree, rdev->lv, NULL))
return_0;
/* Add replicator-dev LV, except of the already added one */
if ((lv != rdev->replicator_dev->lv) &&
!_add_dev_to_dtree(dm, dtree,
rdev->replicator_dev->lv, NULL))
return_0;
/* If replicator exists - try connect existing heads */
if (rep_node) {
uuid = build_dm_uuid(dm->mem,
rdev->replicator_dev->lv->lvid.s,
NULL);
if (!uuid)
return_0;
rdev_node = dm_tree_find_node_by_uuid(dtree, uuid);
if (rdev_node)
dm_tree_node_set_presuspend_node(rdev_node,
rep_node);
}
}
if (!rdev->rsite->vg_name)
continue;
if (!_add_dev_to_dtree(dm, dtree, rdev->lv, NULL))
return_0;
if (rdev->slog &&
!_add_dev_to_dtree(dm, dtree, rdev->slog, NULL))
return_0;
}
return 1;
}
/*
* Add LV and any known dependencies
*/
static int _add_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree, struct logical_volume *lv, int origin_only)
{
struct seg_list *sl;
if (!origin_only && !_add_dev_to_dtree(dm, dtree, lv, NULL))
return_0;
/* FIXME Can we avoid doing this every time? */
if (!_add_dev_to_dtree(dm, dtree, lv, "real"))
return_0;
if (!origin_only && !_add_dev_to_dtree(dm, dtree, lv, "cow"))
return_0;
if ((lv->status & MIRRORED) && first_seg(lv)->log_lv &&
!_add_dev_to_dtree(dm, dtree, first_seg(lv)->log_lv, NULL))
return_0;
/* Add any LVs referencing a PVMOVE LV unless told not to. */
if (dm->track_pvmove_deps && lv->status & PVMOVE)
dm_list_iterate_items(sl, &lv->segs_using_this_lv)
if (!_add_lv_to_dtree(dm, dtree, sl->seg->lv, origin_only))
return_0;
/* Adding LV head of replicator adds all other related devs */
if (lv_is_replicator_dev(lv) &&
!_add_partial_replicator_to_dtree(dm, dtree, lv))
return_0;
return 1;
}
static struct dm_tree *_create_partial_dtree(struct dev_manager *dm, struct logical_volume *lv, int origin_only)
{
struct dm_tree *dtree;
struct dm_list *snh, *snht;
struct lv_segment *seg;
uint32_t s;
if (!(dtree = dm_tree_create())) {
log_error("Partial dtree creation failed for %s.", lv->name);
return NULL;
}
if (!_add_lv_to_dtree(dm, dtree, lv, lv_is_origin(lv) ? origin_only : 0))
goto_bad;
/* Add any snapshots of this LV */
if (!origin_only && lv_is_origin(lv))
dm_list_iterate_safe(snh, snht, &lv->snapshot_segs)
if (!_add_lv_to_dtree(dm, dtree, dm_list_struct_base(snh, struct lv_segment, origin_list)->cow, 0))
goto_bad;
/* Add any LVs used by segments in this LV */
dm_list_iterate_items(seg, &lv->segments)
for (s = 0; s < seg->area_count; s++)
if (seg_type(seg, s) == AREA_LV && seg_lv(seg, s)) {
if (!_add_lv_to_dtree(dm, dtree, seg_lv(seg, s), 0))
goto_bad;
}
return dtree;
bad:
dm_tree_free(dtree);
return NULL;
}
static char *_add_error_device(struct dev_manager *dm, struct dm_tree *dtree,
struct lv_segment *seg, int s)
{
char *id, *name;
char errid[32];
struct dm_tree_node *node;
struct lv_segment *seg_i;
int segno = -1, i = 0;
uint64_t size = seg->len * seg->lv->vg->extent_size;
dm_list_iterate_items(seg_i, &seg->lv->segments) {
if (seg == seg_i)
segno = i;
++i;
}
if (segno < 0) {
log_error("_add_error_device called with bad segment");
return_NULL;
}
sprintf(errid, "missing_%d_%d", segno, s);
if (!(id = build_dm_uuid(dm->mem, seg->lv->lvid.s, errid)))
return_NULL;
if (!(name = build_dm_name(dm->mem, seg->lv->vg->name,
seg->lv->name, errid)))
return_NULL;
if (!(node = dm_tree_add_new_dev(dtree, name, id, 0, 0, 0, 0, 0)))
return_NULL;
if (!dm_tree_node_add_error_target(node, size))
return_NULL;
return id;
}
static int _add_error_area(struct dev_manager *dm, struct dm_tree_node *node,
struct lv_segment *seg, int s)
{
char *dlid;
uint64_t extent_size = seg->lv->vg->extent_size;
if (!strcmp(dm->cmd->stripe_filler, "error")) {
/*
* FIXME, the tree pointer is first field of dm_tree_node, but
* we don't have the struct definition available.
*/
struct dm_tree **tree = (struct dm_tree **) node;
dlid = _add_error_device(dm, *tree, seg, s);
if (!dlid)
return_0;
dm_tree_node_add_target_area(node, NULL, dlid,
extent_size * seg_le(seg, s));
} else
dm_tree_node_add_target_area(node,
dm->cmd->stripe_filler,
NULL, UINT64_C(0));
return 1;
}
int add_areas_line(struct dev_manager *dm, struct lv_segment *seg,
struct dm_tree_node *node, uint32_t start_area,
uint32_t areas)
{
uint64_t extent_size = seg->lv->vg->extent_size;
uint32_t s;
char *dlid;
for (s = start_area; s < areas; s++) {
if ((seg_type(seg, s) == AREA_PV &&
(!seg_pvseg(seg, s) ||
!seg_pv(seg, s) ||
!seg_dev(seg, s))) ||
(seg_type(seg, s) == AREA_LV && !seg_lv(seg, s))) {
if (!_add_error_area(dm, node, seg, s))
return_0;
} else if (seg_type(seg, s) == AREA_PV)
dm_tree_node_add_target_area(node,
dev_name(seg_dev(seg, s)),
NULL,
(seg_pv(seg, s)->pe_start +
(extent_size * seg_pe(seg, s))));
else if (seg_type(seg, s) == AREA_LV) {
if (!(dlid = build_dm_uuid(dm->mem,
seg_lv(seg, s)->lvid.s,
NULL)))
return_0;
dm_tree_node_add_target_area(node, NULL, dlid,
extent_size * seg_le(seg, s));
} else {
log_error(INTERNAL_ERROR "Unassigned area found in LV %s.",
seg->lv->name);
return 0;
}
}
return 1;
}
static int _add_origin_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct logical_volume *lv)
{
const char *real_dlid;
if (!(real_dlid = build_dm_uuid(dm->mem, lv->lvid.s, "real")))
return_0;
if (!dm_tree_node_add_snapshot_origin_target(dnode, lv->size, real_dlid))
return_0;
return 1;
}
static int _add_snapshot_merge_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct logical_volume *lv)
{
const char *origin_dlid, *cow_dlid, *merge_dlid;
struct lv_segment *merging_cow_seg = find_merging_cow(lv);
if (!(origin_dlid = build_dm_uuid(dm->mem, lv->lvid.s, "real")))
return_0;
if (!(cow_dlid = build_dm_uuid(dm->mem, merging_cow_seg->cow->lvid.s, "cow")))
return_0;
if (!(merge_dlid = build_dm_uuid(dm->mem, merging_cow_seg->cow->lvid.s, NULL)))
return_0;
if (!dm_tree_node_add_snapshot_merge_target(dnode, lv->size, origin_dlid,
cow_dlid, merge_dlid,
merging_cow_seg->chunk_size))
return_0;
return 1;
}
static int _add_snapshot_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct logical_volume *lv,
struct lv_activate_opts *laopts)
{
const char *origin_dlid;
const char *cow_dlid;
struct lv_segment *snap_seg;
uint64_t size;
if (!(snap_seg = find_cow(lv))) {
log_error("Couldn't find snapshot for '%s'.", lv->name);
return 0;
}
if (!(origin_dlid = build_dm_uuid(dm->mem, snap_seg->origin->lvid.s, "real")))
return_0;
if (!(cow_dlid = build_dm_uuid(dm->mem, snap_seg->cow->lvid.s, "cow")))
return_0;
size = (uint64_t) snap_seg->len * snap_seg->origin->vg->extent_size;
if (!laopts->no_merging && lv_is_merging_cow(lv)) {
/* cow is to be merged so load the error target */
if (!dm_tree_node_add_error_target(dnode, size))
return_0;
}
else if (!dm_tree_node_add_snapshot_target(dnode, size, origin_dlid,
cow_dlid, 1, snap_seg->chunk_size))
return_0;
return 1;
}
static int _add_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct lv_segment *seg,
struct lv_activate_opts *laopts)
{
uint64_t extent_size = seg->lv->vg->extent_size;
if (!seg->segtype->ops->add_target_line) {
log_error(INTERNAL_ERROR "_emit_target cannot handle "
"segment type %s", seg->segtype->name);
return 0;
}
return seg->segtype->ops->add_target_line(dm, dm->mem, dm->cmd,
&dm->target_state, seg,
laopts, dnode,
extent_size * seg->len,
&dm-> pvmove_mirror_count);
}
static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
struct logical_volume *lv,
struct lv_activate_opts *laopts,
const char *layer);
/* Add all replicators' LVs */
static int _add_replicator_dev_target_to_dtree(struct dev_manager *dm,
struct dm_tree *dtree,
struct lv_segment *seg,
struct lv_activate_opts *laopts)
{
struct replicator_device *rdev;
struct replicator_site *rsite;
/* For inactive replicator add linear mapping */
if (!lv_is_active_replicator_dev(seg->lv)) {
if (!_add_new_lv_to_dtree(dm, dtree, seg->lv->rdevice->lv, laopts, NULL))
return_0;
return 1;
}
/* Add rlog and replicator nodes */
if (!seg->replicator ||
!first_seg(seg->replicator)->rlog_lv ||
!_add_new_lv_to_dtree(dm, dtree,
first_seg(seg->replicator)->rlog_lv,
laopts, NULL) ||
!_add_new_lv_to_dtree(dm, dtree, seg->replicator, laopts, NULL))
return_0;
/* Activation of one replicator_dev node activates all other nodes */
dm_list_iterate_items(rsite, &seg->replicator->rsites) {
dm_list_iterate_items(rdev, &rsite->rdevices) {
if (rdev->lv &&
!_add_new_lv_to_dtree(dm, dtree, rdev->lv,
laopts, NULL))
return_0;
if (rdev->slog &&
!_add_new_lv_to_dtree(dm, dtree, rdev->slog,
laopts, NULL))
return_0;
}
}
/* Add remaining replicator-dev nodes in the second loop
* to avoid multiple retries for inserting all elements */
dm_list_iterate_items(rsite, &seg->replicator->rsites) {
if (rsite->state != REPLICATOR_STATE_ACTIVE)
continue;
dm_list_iterate_items(rdev, &rsite->rdevices) {
if (rdev->replicator_dev->lv == seg->lv)
continue;
if (!rdev->replicator_dev->lv ||
!_add_new_lv_to_dtree(dm, dtree,
rdev->replicator_dev->lv,
laopts, NULL))
return_0;
}
}
return 1;
}
static int _add_segment_to_dtree(struct dev_manager *dm,
struct dm_tree *dtree,
struct dm_tree_node *dnode,
struct lv_segment *seg,
struct lv_activate_opts *laopts,
const char *layer)
{
uint32_t s;
struct dm_list *snh;
struct lv_segment *seg_present;
const char *target_name;
/* Ensure required device-mapper targets are loaded */
seg_present = find_cow(seg->lv) ? : seg;
target_name = (seg_present->segtype->ops->target_name ?
seg_present->segtype->ops->target_name(seg_present, laopts) :
seg_present->segtype->name);
log_debug("Checking kernel supports %s segment type for %s%s%s",
target_name, seg->lv->name,
layer ? "-" : "", layer ? : "");
if (seg_present->segtype->ops->target_present &&
!seg_present->segtype->ops->target_present(seg_present->lv->vg->cmd,
seg_present, NULL)) {
log_error("Can't process LV %s: %s target support missing "
"from kernel?", seg->lv->name, target_name);
return 0;
}
/* Add mirror log */
if (seg->log_lv &&
!_add_new_lv_to_dtree(dm, dtree, seg->log_lv, laopts, NULL))
return_0;
if (seg_is_replicator_dev(seg)) {
if (!_add_replicator_dev_target_to_dtree(dm, dtree, seg, laopts))
return_0;
/* If this is a snapshot origin, add real LV */
/* If this is a snapshot origin + merging snapshot, add cow + real LV */
} else if (lv_is_origin(seg->lv) && !layer) {
if (!laopts->no_merging && lv_is_merging_origin(seg->lv)) {
if (!_add_new_lv_to_dtree(dm, dtree,
find_merging_cow(seg->lv)->cow, laopts, "cow"))
return_0;
/*
* Must also add "real" LV for use when
* snapshot-merge target is added
*/
}
if (!_add_new_lv_to_dtree(dm, dtree, seg->lv, laopts, "real"))
return_0;
} else if (lv_is_cow(seg->lv) && !layer) {
if (!_add_new_lv_to_dtree(dm, dtree, seg->lv, laopts, "cow"))
return_0;
} else {
/* Add any LVs used by this segment */
for (s = 0; s < seg->area_count; s++)
if ((seg_type(seg, s) == AREA_LV) &&
(!_add_new_lv_to_dtree(dm, dtree, seg_lv(seg, s),
laopts, NULL)))
return_0;
}
/* Now we've added its dependencies, we can add the target itself */
if (lv_is_origin(seg->lv) && !layer) {
if (laopts->no_merging || !lv_is_merging_origin(seg->lv)) {
if (!_add_origin_target_to_dtree(dm, dnode, seg->lv))
return_0;
} else {
if (!_add_snapshot_merge_target_to_dtree(dm, dnode, seg->lv))
return_0;
}
} else if (lv_is_cow(seg->lv) && !layer) {
if (!_add_snapshot_target_to_dtree(dm, dnode, seg->lv, laopts))
return_0;
} else if (!_add_target_to_dtree(dm, dnode, seg, laopts))
return_0;
if (lv_is_origin(seg->lv) && !layer)
/* Add any snapshots of this LV */
dm_list_iterate(snh, &seg->lv->snapshot_segs)
if (!_add_new_lv_to_dtree(dm, dtree, dm_list_struct_base(snh, struct lv_segment, origin_list)->cow,
laopts, NULL))
return_0;
return 1;
}
static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
struct logical_volume *lv, struct lv_activate_opts *laopts,
const char *layer)
{
struct lv_segment *seg;
struct lv_layer *lvlayer;
struct seg_list *sl;
struct dm_tree_node *dnode;
const struct dm_info *dinfo;
char *name, *dlid;
uint32_t max_stripe_size = UINT32_C(0);
uint32_t read_ahead = lv->read_ahead;
uint32_t read_ahead_flags = UINT32_C(0);
/* FIXME Seek a simpler way to lay out the snapshot-merge tree. */
if (lv_is_origin(lv) && lv_is_merging_origin(lv) && !layer) {
/*
* Clear merge attributes if merge isn't currently possible:
* either origin or merging snapshot are open
* - but use "snapshot-merge" if it is already in use
* - open_count is always retrieved (as of dm-ioctl 4.7.0)
* so just use the tree's existing nodes' info
*/
if (((dinfo = _cached_info(dm->mem, lv,
dtree)) && dinfo->open_count) ||
((dinfo = _cached_info(dm->mem, find_merging_cow(lv)->cow,
dtree)) && dinfo->open_count)) {
/* FIXME Is there anything simpler to check for instead? */
if (!lv_has_target_type(dm->mem, lv, NULL, "snapshot-merge"))
laopts->no_merging = 1;
}
}
if (!(name = build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, layer)))
return_0;
/* We've already processed this node if it already has a context ptr */
if ((dnode = dm_tree_find_node_by_uuid(dtree, dlid)) &&
dm_tree_node_get_context(dnode))
return 1;
if (!(lvlayer = dm_pool_alloc(dm->mem, sizeof(*lvlayer)))) {
log_error("_add_new_lv_to_dtree: pool alloc failed for %s %s.",
lv->name, layer);
return 0;
}
lvlayer->lv = lv;
/*
* Add LV to dtree.
* If we're working with precommitted metadata, clear any
* existing inactive table left behind.
* Major/minor settings only apply to the visible layer.
*/
/* FIXME Move the clear from here until later, so we can leave
* identical inactive tables untouched. (For pvmove.)
*/
if (!(dnode = dm_tree_add_new_dev_with_udev_flags(dtree, name, dlid,
layer ? UINT32_C(0) : (uint32_t) lv->major,
layer ? UINT32_C(0) : (uint32_t) lv->minor,
_read_only_lv(lv),
(lv->vg->status & PRECOMMITTED) ? 1 : 0,
lvlayer,
_get_udev_flags(dm, lv, layer))))
return_0;
/* Store existing name so we can do rename later */
lvlayer->old_name = dm_tree_node_get_name(dnode);
/* Create table */
dm->pvmove_mirror_count = 0u;
dm_list_iterate_items(seg, &lv->segments) {
if (!_add_segment_to_dtree(dm, dtree, dnode, seg, laopts, layer))
return_0;
/* These aren't real segments in the LVM2 metadata */
if (lv_is_origin(lv) && !layer)
break;
if (!laopts->no_merging && lv_is_cow(lv) && !layer)
break;
if (max_stripe_size < seg->stripe_size * seg->area_count)
max_stripe_size = seg->stripe_size * seg->area_count;
}
if (read_ahead == DM_READ_AHEAD_AUTO) {
/* we need RA at least twice a whole stripe - see the comment in md/raid0.c */
read_ahead = max_stripe_size * 2;
if (!read_ahead)
lv_calculate_readahead(lv, &read_ahead);
read_ahead_flags = DM_READ_AHEAD_MINIMUM_FLAG;
}
dm_tree_node_set_read_ahead(dnode, read_ahead, read_ahead_flags);
/* Add any LVs referencing a PVMOVE LV unless told not to */
if (dm->track_pvmove_deps && (lv->status & PVMOVE))
dm_list_iterate_items(sl, &lv->segs_using_this_lv)
if (!_add_new_lv_to_dtree(dm, dtree, sl->seg->lv, laopts, NULL))
return_0;
return 1;
}
/* FIXME: symlinks should be created/destroyed at the same time
* as the kernel devices but we can't do that from within libdevmapper
* at present so we must walk the tree twice instead. */
/*
* Create LV symlinks for children of supplied root node.
*/
static int _create_lv_symlinks(struct dev_manager *dm, struct dm_tree_node *root)
{
void *handle = NULL;
struct dm_tree_node *child;
struct lv_layer *lvlayer;
char *old_vgname, *old_lvname, *old_layer;
char *new_vgname, *new_lvname, *new_layer;
const char *name;
int r = 1;
/* Nothing to do if udev fallback is disabled. */
if (!dm->cmd->current_settings.udev_fallback)
return 1;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!(lvlayer = dm_tree_node_get_context(child)))
continue;
/* Detect rename */
name = dm_tree_node_get_name(child);
if (name && lvlayer->old_name && *lvlayer->old_name && strcmp(name, lvlayer->old_name)) {
if (!dm_split_lvm_name(dm->mem, lvlayer->old_name, &old_vgname, &old_lvname, &old_layer)) {
log_error("_create_lv_symlinks: Couldn't split up old device name %s", lvlayer->old_name);
return 0;
}
if (!dm_split_lvm_name(dm->mem, name, &new_vgname, &new_lvname, &new_layer)) {
log_error("_create_lv_symlinks: Couldn't split up new device name %s", name);
return 0;
}
if (!fs_rename_lv(lvlayer->lv, name, old_vgname, old_lvname))
r = 0;
continue;
}
if (lv_is_visible(lvlayer->lv)) {
if (!_dev_manager_lv_mknodes(lvlayer->lv))
r = 0;
continue;
}
if (!_dev_manager_lv_rmnodes(lvlayer->lv))
r = 0;
}
return r;
}
/*
* Remove LV symlinks for children of supplied root node.
*/
static int _remove_lv_symlinks(struct dev_manager *dm, struct dm_tree_node *root)
{
void *handle = NULL;
struct dm_tree_node *child;
char *vgname, *lvname, *layer;
int r = 1;
/* Nothing to do if udev fallback is disabled. */
if (!dm->cmd->current_settings.udev_fallback)
return 1;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!dm_split_lvm_name(dm->mem, dm_tree_node_get_name(child), &vgname, &lvname, &layer)) {
r = 0;
continue;
}
if (!*vgname)
continue;
/* only top level layer has symlinks */
if (*layer)
continue;
fs_del_lv_byname(dm->cmd->dev_dir, vgname, lvname,
dm->cmd->current_settings.udev_rules);
}
return r;
}
static int _clean_tree(struct dev_manager *dm, struct dm_tree_node *root, char *non_toplevel_tree_dlid)
{
void *handle = NULL;
struct dm_tree_node *child;
char *vgname, *lvname, *layer;
const char *name, *uuid;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!(name = dm_tree_node_get_name(child)))
continue;
if (!(uuid = dm_tree_node_get_uuid(child)))
continue;
if (!dm_split_lvm_name(dm->mem, name, &vgname, &lvname, &layer)) {
log_error("_clean_tree: Couldn't split up device name %s.", name);
return 0;
}
/* Not meant to be top level? */
if (!*layer)
continue;
/* If operation was performed on a partial tree, don't remove it */
if (non_toplevel_tree_dlid && !strcmp(non_toplevel_tree_dlid, uuid))
continue;
if (!dm_tree_deactivate_children(root, uuid, strlen(uuid)))
return_0;
}
return 1;
}
static int _tree_action(struct dev_manager *dm, struct logical_volume *lv,
struct lv_activate_opts *laopts, action_t action)
{
struct dm_tree *dtree;
struct dm_tree_node *root;
char *dlid;
int r = 0;
if (!(dtree = _create_partial_dtree(dm, lv, laopts->origin_only)))
return_0;
if (!(root = dm_tree_find_node(dtree, 0, 0))) {
log_error("Lost dependency tree root node");
goto out_no_root;
}
/* Restore fs cookie */
dm_tree_set_cookie(root, fs_get_cookie());
if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, (lv_is_origin(lv) && laopts->origin_only) ? "real" : NULL)))
goto_out;
/* Only process nodes with uuid of "LVM-" plus VG id. */
switch(action) {
case CLEAN:
/* Deactivate any unused non-toplevel nodes */
if (!_clean_tree(dm, root, laopts->origin_only ? dlid : NULL))
goto_out;
break;
case DEACTIVATE:
/* Deactivate LV and all devices it references that nothing else has open. */
r = dm_tree_deactivate_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1);
if (!r)
goto_out;
if (!_remove_lv_symlinks(dm, root))
log_error("Failed to remove all device symlinks associated with %s.", lv->name);
break;
case SUSPEND:
dm_tree_skip_lockfs(root);
if (!dm->flush_required && (lv->status & MIRRORED) && !(lv->status & PVMOVE))
dm_tree_use_no_flush_suspend(root);
/* Fall through */
case SUSPEND_WITH_LOCKFS:
if (!dm_tree_suspend_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1))
goto_out;
break;
case PRELOAD:
case ACTIVATE:
/* Add all required new devices to tree */
if (!_add_new_lv_to_dtree(dm, dtree, lv, laopts, (lv_is_origin(lv) && laopts->origin_only) ? "real" : NULL))
goto_out;
/* Preload any devices required before any suspensions */
r = dm_tree_preload_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1);
if (!r)
goto_out;
if (dm_tree_node_size_changed(root))
dm->flush_required = 1;
if (action == ACTIVATE) {
r = dm_tree_activate_children(root, dlid, ID_LEN + sizeof(UUID_PREFIX) - 1);
if (!r)
goto_out;
if (!_create_lv_symlinks(dm, root)) {
log_error("Failed to create symlinks for %s.", lv->name);
goto out;
}
}
break;
default:
log_error("_tree_action: Action %u not supported.", action);
goto out;
}
r = 1;
out:
/* Save fs cookie for udev settle, do not wait here */
fs_set_cookie(dm_tree_get_cookie(root));
out_no_root:
dm_tree_free(dtree);
return r;
}
/* origin_only may only be set if we are resuming (not activating) an origin LV */
int dev_manager_activate(struct dev_manager *dm, struct logical_volume *lv,
struct lv_activate_opts *laopts)
{
if (!_tree_action(dm, lv, laopts, ACTIVATE))
return_0;
return _tree_action(dm, lv, laopts, CLEAN);
}
/* origin_only may only be set if we are resuming (not activating) an origin LV */
int dev_manager_preload(struct dev_manager *dm, struct logical_volume *lv,
struct lv_activate_opts *laopts, int *flush_required)
{
if (!_tree_action(dm, lv, laopts, PRELOAD))
return 0;
*flush_required = dm->flush_required;
return 1;
}
int dev_manager_deactivate(struct dev_manager *dm, struct logical_volume *lv)
{
struct lv_activate_opts laopts = { 0 };
int r;
r = _tree_action(dm, lv, &laopts, DEACTIVATE);
return r;
}
int dev_manager_suspend(struct dev_manager *dm, struct logical_volume *lv,
struct lv_activate_opts *laopts, int lockfs, int flush_required)
{
dm->flush_required = flush_required;
return _tree_action(dm, lv, laopts, lockfs ? SUSPEND_WITH_LOCKFS : SUSPEND);
}
/*
* Does device use VG somewhere in its construction?
* Returns 1 if uncertain.
*/
int dev_manager_device_uses_vg(struct device *dev,
struct volume_group *vg)
{
struct dm_tree *dtree;
struct dm_tree_node *root;
char dlid[sizeof(UUID_PREFIX) + sizeof(struct id) - 1] __attribute__((aligned(8)));
int r = 1;
if (!(dtree = dm_tree_create())) {
log_error("partial dtree creation failed");
return r;
}
if (!dm_tree_add_dev(dtree, (uint32_t) MAJOR(dev->dev), (uint32_t) MINOR(dev->dev))) {
log_error("Failed to add device %s (%" PRIu32 ":%" PRIu32") to dtree",
dev_name(dev), (uint32_t) MAJOR(dev->dev), (uint32_t) MINOR(dev->dev));
goto out;
}
memcpy(dlid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1);
memcpy(dlid + sizeof(UUID_PREFIX) - 1, &vg->id.uuid[0], sizeof(vg->id));
if (!(root = dm_tree_find_node(dtree, 0, 0))) {
log_error("Lost dependency tree root node");
goto out;
}
if (dm_tree_children_use_uuid(root, dlid, sizeof(UUID_PREFIX) + sizeof(vg->id) - 1))
goto_out;
r = 0;
out:
dm_tree_free(dtree);
return r;
}
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