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e689bfb5d5
lvm2/lib/activate/dev_manager.c
Zdenek Kabelac e689bfb5d5 vdo: minor API cleanup 
Since the parse_vdo_pool_status() become vdo_manip API part,
and there will be no 'dm' matching status parser,
the API can be simplified and closely match thin API here.
2019-01-21 12:53:16 +01:00

3786 lines
106 KiB
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/*
* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2018 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "lib/misc/lib.h"
#include "dev_manager.h"
#include "lib/misc/lvm-string.h"
#include "fs.h"
#include "lib/config/defaults.h"
#include "lib/metadata/segtype.h"
#include "lib/display/display.h"
#include "lib/commands/toolcontext.h"
#include "lib/activate/targets.h"
#include "lib/config/config.h"
#include "lib/activate/activate.h"
#include "lib/misc/lvm-exec.h"
#include "lib/datastruct/str_list.h"
#include <limits.h>
#include <dirent.h>
#define MAX_TARGET_PARAMSIZE 50000
#define LVM_UDEV_NOSCAN_FLAG DM_SUBSYSTEM_UDEV_FLAG0
#define CRYPT_TEMP "CRYPT-TEMP"
#define STRATIS "stratis-"
typedef enum {
PRELOAD,
ACTIVATE,
DEACTIVATE,
SUSPEND,
SUSPEND_WITH_LOCKFS,
CLEAN
} action_t;
/* This list must match lib/misc/lvm-string.c:build_dm_uuid(). */
const char *uuid_suffix_list[] = { "pool", "cdata", "cmeta", "tdata", "tmeta", "vdata", "vpool", NULL};
struct dlid_list {
struct dm_list list;
const char *dlid;
const struct logical_volume *lv;
};
struct dev_manager {
struct dm_pool *mem;
struct cmd_context *cmd;
void *target_state;
uint32_t pvmove_mirror_count;
int flush_required;
int activation; /* building activation tree */
int suspend; /* building suspend tree */
unsigned track_external_lv_deps;
struct dm_list pending_delete; /* str_list of dlid(s) with pending delete */
unsigned track_pending_delete;
unsigned track_pvmove_deps;
const char *vg_name;
};
struct lv_layer {
const struct logical_volume *lv;
const char *old_name;
int visible_component;
};
int read_only_lv(const struct logical_volume *lv, const struct lv_activate_opts *laopts, const char *layer)
{
if (layer && lv_is_cow(lv))
return 0; /* Keep snapshot's COW volume writable */
if (lv_is_raid_image(lv) || lv_is_raid_metadata(lv))
return 0; /* Keep RAID SubLvs writable */
return (laopts->read_only || !(lv->status & LVM_WRITE));
}
/*
* Low level device-layer operations.
*
* Unless task is DM_DEVICE_TARGET_MSG, also calls dm_task_run()
*/
static struct dm_task *_setup_task_run(int task, struct dm_info *info,
const char *name, const char *uuid,
uint32_t *event_nr,
uint32_t major, uint32_t minor,
int with_open_count,
int with_flush,
int query_inactive)
{
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;
if (query_inactive && !dm_task_query_inactive_table(dmt)) {
log_error("Failed to set query_inactive_table.");
goto out;
}
if (!with_open_count && !dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if (!with_flush && !dm_task_no_flush(dmt))
log_warn("WARNING: Failed to set no_flush.");
if (task == DM_DEVICE_TARGET_MSG)
return dmt; /* TARGET_MSG needs more local tweaking before task_run() */
if (!dm_task_run(dmt))
goto_out;
if (info && !dm_task_get_info(dmt, info))
goto_out;
return dmt;
out:
dm_task_destroy(dmt);
return NULL;
}
static int _get_segment_status_from_target_params(const char *target_name,
const char *params,
struct lv_seg_status *seg_status)
{
const struct lv_segment *seg = seg_status->seg;
const struct segment_type *segtype = seg->segtype;
seg_status->type = SEG_STATUS_UNKNOWN; /* Parsing failed */
/* Switch to snapshot segtype status logic for merging origin */
/* This is 'dynamic' decision, both states are valid */
if (lv_is_merging_origin(seg->lv)) {
if (!strcmp(target_name, TARGET_NAME_SNAPSHOT_ORIGIN)) {
seg_status->type = SEG_STATUS_NONE;
return 1; /* Merge has not yet started */
}
if (!strcmp(target_name, TARGET_NAME_SNAPSHOT_MERGE) &&
!(segtype = get_segtype_from_string(seg->lv->vg->cmd, TARGET_NAME_SNAPSHOT)))
return_0;
/* Merging, parse 'snapshot' status of merge progress */
}
if (!params) {
log_warn("WARNING: Cannot find matching %s segment for %s.",
segtype->name, display_lvname(seg_status->seg->lv));
return 0;
}
/* Validate target_name segtype from DM table with lvm2 metadata segtype */
if (!lv_is_locked(seg->lv) &&
strcmp(segtype->name, target_name) &&
/* If kernel's type isn't an exact match is it compatible? */
(!segtype->ops->target_status_compatible ||
!segtype->ops->target_status_compatible(target_name))) {
log_warn(INTERNAL_ERROR "WARNING: Segment type %s found does not match expected type %s for %s.",
target_name, segtype->name, display_lvname(seg_status->seg->lv));
return 0;
}
/* TODO: move into segtype method */
if (segtype_is_cache(segtype)) {
if (!dm_get_status_cache(seg_status->mem, params, &(seg_status->cache)))
return_0;
seg_status->type = SEG_STATUS_CACHE;
} else if (segtype_is_raid(segtype)) {
if (!dm_get_status_raid(seg_status->mem, params, &seg_status->raid))
return_0;
seg_status->type = SEG_STATUS_RAID;
} else if (segtype_is_thin_volume(segtype)) {
if (!dm_get_status_thin(seg_status->mem, params, &seg_status->thin))
return_0;
seg_status->type = SEG_STATUS_THIN;
} else if (segtype_is_thin_pool(segtype)) {
if (!dm_get_status_thin_pool(seg_status->mem, params, &seg_status->thin_pool))
return_0;
seg_status->type = SEG_STATUS_THIN_POOL;
} else if (segtype_is_snapshot(segtype)) {
if (!dm_get_status_snapshot(seg_status->mem, params, &seg_status->snapshot))
return_0;
seg_status->type = SEG_STATUS_SNAPSHOT;
} else if (segtype_is_vdo_pool(segtype)) {
if (!parse_vdo_pool_status(seg_status->mem, seg->lv, params, &seg_status->vdo_pool))
return_0;
seg_status->type = SEG_STATUS_VDO_POOL;
} else if (segtype_is_writecache(segtype)) {
if (!dm_get_status_writecache(seg_status->mem, params, &(seg_status->writecache)))
return_0;
seg_status->type = SEG_STATUS_WRITECACHE;
} else
/*
* TODO: Add support for other segment types too!
* Status not supported
*/
seg_status->type = SEG_STATUS_NONE;
return 1;
}
typedef enum {
INFO, /* DM_DEVICE_INFO ioctl */
STATUS, /* DM_DEVICE_STATUS ioctl */
} info_type_t;
/* Return length of segment depending on type and reshape_len */
static uint32_t _seg_len(const struct lv_segment *seg)
{
uint32_t reshape_len = seg_is_raid(seg) ? ((seg->area_count - seg->segtype->parity_devs) * seg->reshape_len) : 0;
return seg->len - reshape_len;
}
static int _info_run(const char *dlid, struct dm_info *dminfo,
uint32_t *read_ahead,
struct lv_seg_status *seg_status,
int with_open_count, int with_read_ahead,
uint32_t major, uint32_t minor)
{
int r = 0;
struct dm_task *dmt;
int dmtask;
int with_flush; /* TODO: arg for _info_run */
void *target = NULL;
uint64_t target_start, target_length, start, length;
char *target_name, *target_params;
if (seg_status) {
dmtask = DM_DEVICE_STATUS;
with_flush = 0;
} else {
dmtask = DM_DEVICE_INFO;
with_flush = 1; /* doesn't really matter */
}
if (!(dmt = _setup_task_run(dmtask, dminfo, NULL, dlid, 0, major, minor,
with_open_count, with_flush, 0)))
return_0;
if (with_read_ahead && dminfo->exists) {
if (!dm_task_get_read_ahead(dmt, read_ahead))
goto_out;
} else if (read_ahead)
*read_ahead = DM_READ_AHEAD_NONE;
/* Query status only for active device */
if (seg_status && dminfo->exists) {
start = length = seg_status->seg->lv->vg->extent_size;
start *= seg_status->seg->le;
length *= _seg_len(seg_status->seg);
/* Uses max DM_THIN_MAX_METADATA_SIZE sectors for metadata device */
if (lv_is_thin_pool_metadata(seg_status->seg->lv) &&
(length > DM_THIN_MAX_METADATA_SIZE))
length = DM_THIN_MAX_METADATA_SIZE;
/* Uses virtual size with headers for VDO pool device */
if (lv_is_vdo_pool(seg_status->seg->lv))
length = get_vdo_pool_virtual_size(seg_status->seg);
do {
target = dm_get_next_target(dmt, target, &target_start,
&target_length, &target_name, &target_params);
if ((start == target_start) && (length == target_length))
break; /* Keep target_params when matching segment is found */
target_params = NULL; /* Marking this target_params unusable */
} while (target);
if (!target_name ||
!_get_segment_status_from_target_params(target_name, target_params, seg_status))
stack;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/*
* ignore_blocked_mirror_devices
* @dev
* @start
* @length
* @mirror_status_str
*
* When a DM 'mirror' target is created with 'block_on_error' or
* 'handle_errors', it will block I/O if there is a device failure
* until the mirror is reconfigured. Thus, LVM should never attempt
* to read labels from a mirror that has a failed device. (LVM
* commands are issued to repair mirrors; and if LVM is blocked
* attempting to read a mirror, a circular dependency would be created.)
*
* This function is a slimmed-down version of lib/mirror/mirrored.c:
* _mirrored_transient_status().
*
* If a failed device is detected in the status string, then it must be
* determined if 'block_on_error' or 'handle_errors' was used when
* creating the mirror. This info can only be determined from the mirror
* table. The 'dev', 'start', 'length' trio allow us to correlate the
* 'mirror_status_str' with the correct device table in order to check
* for blocking.
*
* Returns: 1 if mirror should be ignored, 0 if safe to use
*/
static int _ignore_blocked_mirror_devices(struct device *dev,
uint64_t start, uint64_t length,
char *mirror_status_str)
{
struct dm_pool *mem;
struct dm_status_mirror *sm;
unsigned i, check_for_blocking = 0;
uint64_t s,l;
char *p, *params, *target_type = NULL;
void *next = NULL;
struct dm_task *dmt = NULL;
int r = 0;
struct device *tmp_dev;
char buf[16];
if (!(mem = dm_pool_create("blocked_mirrors", 128)))
return_0;
if (!dm_get_status_mirror(mem, mirror_status_str, &sm))
goto_out;
for (i = 0; i < sm->dev_count; ++i)
if (sm->devs[i].health != DM_STATUS_MIRROR_ALIVE) {
log_debug_activation("%s: Mirror image %d marked as failed.",
dev_name(dev), i);
check_for_blocking = 1;
}
if (!check_for_blocking && sm->log_count) {
if (sm->logs[0].health != DM_STATUS_MIRROR_ALIVE) {
log_debug_activation("%s: Mirror log device marked as failed.",
dev_name(dev));
check_for_blocking = 1;
} else {
if (dm_snprintf(buf, sizeof(buf), "%u:%u",
sm->logs[0].major, sm->logs[0].minor) < 0)
goto_out;
if (!(tmp_dev = dev_create_file(buf, NULL, NULL, 0)))
goto_out;
tmp_dev->dev = MKDEV(sm->logs[0].major, sm->logs[0].minor);
if (device_is_usable(tmp_dev, (struct dev_usable_check_params)
{ .check_empty = 1,
.check_blocked = 1,
.check_suspended = ignore_suspended_devices(),
.check_error_target = 1,
.check_reserved = 0 }))
goto out; /* safe to use */
stack;
}
}
if (!check_for_blocking) {
r = 1;
goto out;
}
/*
* We avoid another system call if we can, but if a device is
* dead, we have no choice but to look up the table too.
*/
if (!(dmt = _setup_task_run(DM_DEVICE_TABLE, NULL, NULL, NULL, NULL,
MAJOR(dev->dev), MINOR(dev->dev), 0, 1, 0)))
goto_out;
do {
next = dm_get_next_target(dmt, next, &s, &l,
&target_type, &params);
if ((s == start) && (l == length) &&
target_type && params) {
if (strcmp(target_type, TARGET_NAME_MIRROR))
goto_out;
if (((p = strstr(params, " block_on_error")) &&
(p[15] == '\0' || p[15] == ' ')) ||
((p = strstr(params, " handle_errors")) &&
(p[14] == '\0' || p[14] == ' '))) {
log_debug_activation("%s: I/O blocked to mirror device.",
dev_name(dev));
goto out;
}
}
} while (next);
r = 1;
out:
if (dmt)
dm_task_destroy(dmt);
dm_pool_destroy(mem);
return r;
}
static int _device_is_suspended(int major, int minor)
{
struct dm_task *dmt;
struct dm_info info;
if (!(dmt = _setup_task_run(DM_DEVICE_INFO, &info,
NULL, NULL, NULL,
major, minor, 0, 0, 0)))
return_0;
dm_task_destroy(dmt);
return (info.exists && info.suspended);
}
static int _ignore_suspended_snapshot_component(struct device *dev)
{
struct dm_task *dmt;
void *next = NULL;
char *params, *target_type = NULL;
uint64_t start, length;
int major1, minor1, major2, minor2;
int r = 0;
if (!(dmt = _setup_task_run(DM_DEVICE_TABLE, NULL,
NULL, NULL, NULL,
MAJOR(dev->dev), MINOR(dev->dev), 0, 1, 0)))
return_0;
do {
next = dm_get_next_target(dmt, next, &start, &length, &target_type, &params);
if (!target_type)
continue;
if (!strcmp(target_type, TARGET_NAME_SNAPSHOT)) {
if (!params || sscanf(params, "%d:%d %d:%d", &major1, &minor1, &major2, &minor2) != 4) {
log_warn("WARNING: Incorrect snapshot table found for %d:%d.",
(int)MAJOR(dev->dev), (int)MINOR(dev->dev));
goto out;
}
r = r || _device_is_suspended(major1, minor1) || _device_is_suspended(major2, minor2);
} else if (!strcmp(target_type, TARGET_NAME_SNAPSHOT_ORIGIN)) {
if (!params || sscanf(params, "%d:%d", &major1, &minor1) != 2) {
log_warn("WARNING: Incorrect snapshot-origin table found for %d:%d.",
(int)MAJOR(dev->dev), (int)MINOR(dev->dev));
goto out;
}
r = r || _device_is_suspended(major1, minor1);
}
} while (next);
out:
dm_task_destroy(dmt);
return r;
}
static int _ignore_unusable_thins(struct device *dev)
{
/* TODO make function for thin testing */
struct dm_pool *mem;
struct dm_status_thin_pool *status;
struct dm_task *dmt = NULL;
void *next = NULL;
uint64_t start, length;
char *target_type = NULL;
char *params;
int minor, major;
int r = 0;
if (!(mem = dm_pool_create("unusable_thins", 128)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_TABLE, NULL, NULL, NULL, NULL,
MAJOR(dev->dev), MINOR(dev->dev), 0, 1, 0)))
goto_out;
dm_get_next_target(dmt, next, &start, &length, &target_type, &params);
if (!params || sscanf(params, "%d:%d", &major, &minor) != 2) {
log_warn("WARNING: Cannot get thin-pool major:minor for thin device %d:%d.",
(int)MAJOR(dev->dev), (int)MINOR(dev->dev));
goto out;
}
dm_task_destroy(dmt);
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, NULL, NULL, NULL, NULL,
major, minor, 0, 0, 0)))
goto_out;
dm_get_next_target(dmt, next, &start, &length, &target_type, &params);
if (!dm_get_status_thin_pool(mem, params, &status))
goto_out;
if (status->read_only || status->out_of_data_space) {
log_warn("WARNING: %s: Thin's thin-pool needs inspection.",
dev_name(dev));
goto out;
}
r = 1;
out:
if (dmt)
dm_task_destroy(dmt);
dm_pool_destroy(mem);
return r;
}
static int _ignore_invalid_snapshot(const char *params)
{
struct dm_status_snapshot *s;
struct dm_pool *mem;
int r = 0;
if (!(mem = dm_pool_create("invalid snapshots", 128)))
return_0;
if (!dm_get_status_snapshot(mem, params, &s))
stack;
else
r = s->invalid;
dm_pool_destroy(mem);
return r;
}
static int _ignore_frozen_raid(struct device *dev, const char *params)
{
struct dm_status_raid *s;
struct dm_pool *mem;
int r = 0;
if (!(mem = dm_pool_create("frozen raid", 128)))
return_0;
if (!dm_get_status_raid(mem, params, &s))
stack;
else if (s->sync_action && !strcmp(s->sync_action, "frozen")) {
log_warn("WARNING: %s frozen raid device (%d:%d) needs inspection.",
dev_name(dev), (int)MAJOR(dev->dev), (int)MINOR(dev->dev));
r = 1;
}
dm_pool_destroy(mem);
return r;
}
/*
* device_is_usable
* @dev
* @check_lv_names
*
* A device is considered not usable if it is:
* 1) An empty device (no targets)
* 2) A blocked mirror (i.e. a mirror with a failure and block_on_error set)
* 3) ignore_suspended_devices is set and
* a) the device is suspended
* b) it is a snapshot origin
* 4) an error target
* 5) the LV name is a reserved name.
*
* Returns: 1 if usable, 0 otherwise
*/
int device_is_usable(struct device *dev, struct dev_usable_check_params check)
{
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 = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, NULL, NULL,
MAJOR(dev->dev), MINOR(dev->dev), 0, 0, 0)))
return_0;
if (!info.exists)
goto out;
name = dm_task_get_name(dmt);
uuid = dm_task_get_uuid(dmt);
if (check.check_empty && !info.target_count) {
log_debug_activation("%s: Empty device %s not usable.", dev_name(dev), name);
goto out;
}
if (check.check_suspended && info.suspended) {
log_debug_activation("%s: Suspended device %s not usable.", dev_name(dev), name);
goto out;
}
/* Check internal lvm devices */
if (check.check_reserved &&
uuid && !strncmp(uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1)) {
if (strlen(uuid) > (sizeof(UUID_PREFIX) + 2 * ID_LEN)) { /* 68 */
log_debug_activation("%s: Reserved uuid %s on internal LV device %s not usable.",
dev_name(dev), uuid, name);
goto out;
}
if (!(vgname = strdup(name)) ||
!dm_split_lvm_name(NULL, NULL, &vgname, &lvname, &layer))
goto_out;
/* FIXME: fails to handle dev aliases i.e. /dev/dm-5, replace with UUID suffix */
if (lvname && (is_reserved_lvname(lvname) || *layer)) {
log_debug_activation("%s: Reserved internal LV device %s/%s%s%s not usable.",
dev_name(dev), vgname, lvname, *layer ? "-" : "", layer);
goto out;
}
}
if (check.check_lv && uuid && !strncmp(uuid, "LVM-", 4)) {
/* Skip LVs */
goto out;
}
if (check.check_reserved && uuid &&
(!strncmp(uuid, CRYPT_TEMP, sizeof(CRYPT_TEMP) - 1) ||
!strncmp(uuid, STRATIS, sizeof(STRATIS) - 1))) {
/* Skip private crypto devices */
log_debug_activation("%s: Reserved uuid %s on %s device %s not usable.",
dev_name(dev), uuid,
uuid[0] == 'C' ? "crypto" : "stratis",
name);
goto out;
}
/* FIXME Also check for mpath no paths */
do {
next = dm_get_next_target(dmt, next, &start, &length,
&target_type, &params);
if (!target_type)
continue;
if (check.check_blocked && !strcmp(target_type, TARGET_NAME_MIRROR)) {
if (ignore_lvm_mirrors()) {
log_debug_activation("%s: Scanning mirror devices is disabled.", dev_name(dev));
goto out;
}
if (!_ignore_blocked_mirror_devices(dev, start,
length, params)) {
log_debug_activation("%s: Mirror device %s not usable.",
dev_name(dev), name);
goto out;
}
}
/*
* FIXME: Snapshot origin could be sitting on top of a mirror
* which could be blocking I/O. We should add a check for the
* stack here and see if there's blocked mirror underneath.
* Currently, mirrors used as origin or snapshot is not
* supported anymore and in general using mirrors in a stack
* is disabled by default (with a warning that if enabled,
* it could cause various deadlocks).
* Similar situation can happen with RAID devices where
* a RAID device can be snapshotted.
* If one of the RAID legs are down and we're doing
* lvconvert --repair, there's a time period in which
* snapshot components are (besides other devs) suspended.
* See also https://bugzilla.redhat.com/show_bug.cgi?id=1219222
* for an example where this causes problems.
*
* This is a quick check for now, but replace it with more
* robust and better check that would check the stack
* correctly, not just snapshots but any cobimnation possible
* in a stack - use proper dm tree to check this instead.
*/
if (check.check_suspended &&
(!strcmp(target_type, TARGET_NAME_SNAPSHOT) || !strcmp(target_type, TARGET_NAME_SNAPSHOT_ORIGIN)) &&
_ignore_suspended_snapshot_component(dev)) {
log_debug_activation("%s: %s device %s not usable.", dev_name(dev), target_type, name);
goto out;
}
if (!strcmp(target_type, TARGET_NAME_SNAPSHOT) &&
_ignore_invalid_snapshot(params)) {
log_debug_activation("%s: Invalid %s device %s not usable.", dev_name(dev), target_type, name);
goto out;
}
if (!strncmp(target_type, TARGET_NAME_RAID, 4) && _ignore_frozen_raid(dev, params)) {
log_debug_activation("%s: Frozen %s device %s not usable.",
dev_name(dev), target_type, name);
goto out;
}
/* TODO: extend check struct ? */
if (!strcmp(target_type, TARGET_NAME_THIN) &&
!_ignore_unusable_thins(dev)) {
log_debug_activation("%s: %s device %s not usable.", dev_name(dev), target_type, name);
goto out;
}
if (strcmp(target_type, TARGET_NAME_ERROR))
only_error_target = 0;
} while (next);
/* Skip devices consisting entirely of error targets. */
/* FIXME Deal with device stacked above error targets? */
if (check.check_error_target && only_error_target) {
log_debug_activation("%s: Error device %s not usable.",
dev_name(dev), name);
goto out;
}
/* FIXME Also check dependencies? */
r = 1;
out:
free(vgname);
dm_task_destroy(dmt);
return r;
}
/*
* If active LVs were activated by a version of LVM2 before 2.02.00 we must
* perform additional checks to find them because they do not have the LVM-
* prefix on their dm uuids.
* As of 2.02.150, we've chosen to disable this compatibility arbitrarily if
* we're running kernel version 3 or above.
*/
#define MIN_KERNEL_MAJOR 3
static int _original_uuid_format_check_required(struct cmd_context *cmd)
{
static int _kernel_major = 0;
if (!_kernel_major) {
if ((sscanf(cmd->kernel_vsn, "%d", &_kernel_major) == 1) &&
(_kernel_major >= MIN_KERNEL_MAJOR))
log_debug_activation("Skipping checks for old devices without " UUID_PREFIX
" dm uuid prefix (kernel vsn %d >= %d).", _kernel_major, MIN_KERNEL_MAJOR);
else
_kernel_major = -1;
}
return (_kernel_major == -1);
}
static int _info(struct cmd_context *cmd,
const char *name, const char *dlid,
int with_open_count, int with_read_ahead,
struct dm_info *dminfo, uint32_t *read_ahead,
struct lv_seg_status *seg_status)
{
char old_style_dlid[sizeof(UUID_PREFIX) + 2 * ID_LEN];
const char *suffix, *suffix_position;
unsigned i = 0;
log_debug_activation("Getting device info for %s [%s].", name, dlid);
/* Check for dlid */
if (!_info_run(dlid, dminfo, read_ahead, seg_status,
with_open_count, with_read_ahead, 0, 0))
return_0;
if (dminfo->exists)
return 1;
/* Check for original version of dlid before the suffixes got added in 2.02.106 */
if ((suffix_position = rindex(dlid, '-'))) {
while ((suffix = uuid_suffix_list[i++])) {
if (strcmp(suffix_position + 1, suffix))
continue;
(void) strncpy(old_style_dlid, dlid, sizeof(old_style_dlid));
old_style_dlid[sizeof(old_style_dlid) - 1] = '\0';
if (!_info_run(old_style_dlid, dminfo, read_ahead, seg_status,
with_open_count, with_read_ahead, 0, 0))
return_0;
if (dminfo->exists)
return 1;
}
}
/* Must we still check for the pre-2.02.00 dm uuid format? */
if (!_original_uuid_format_check_required(cmd))
return 1;
/* Check for dlid before UUID_PREFIX was added */
if (!_info_run(dlid + sizeof(UUID_PREFIX) - 1, dminfo, read_ahead, seg_status,
with_open_count, with_read_ahead, 0, 0))
return_0;
return 1;
}
/* FIXME: could we just use dev_manager_info instead of this? */
int get_cache_single_meta_data(struct cmd_context *cmd,
struct logical_volume *lv,
struct logical_volume *pool_lv,
struct dm_info *info_meta, struct dm_info *info_data)
{
struct lv_segment *lvseg = first_seg(lv);
union lvid lvid_meta;
union lvid lvid_data;
char *name_meta;
char *name_data;
char *dlid_meta;
char *dlid_data;
memset(&lvid_meta, 0, sizeof(lvid_meta));
memset(&lvid_data, 0, sizeof(lvid_meta));
memcpy(&lvid_meta.id[0], &lv->vg->id, sizeof(struct id));
memcpy(&lvid_meta.id[1], &lvseg->metadata_id, sizeof(struct id));
memcpy(&lvid_data.id[0], &lv->vg->id, sizeof(struct id));
memcpy(&lvid_data.id[1], &lvseg->data_id, sizeof(struct id));
if (!(dlid_meta = dm_build_dm_uuid(cmd->mem, UUID_PREFIX, (const char *)&lvid_meta.s, NULL)))
return_0;
if (!(dlid_data = dm_build_dm_uuid(cmd->mem, UUID_PREFIX, (const char *)&lvid_data.s, NULL)))
return_0;
if (!(name_meta = dm_build_dm_name(cmd->mem, lv->vg->name, pool_lv->name, "_cmeta")))
return_0;
if (!(name_data = dm_build_dm_name(cmd->mem, lv->vg->name, pool_lv->name, "_cdata")))
return_0;
if (!_info(cmd, name_meta, dlid_meta, 1, 0, info_meta, NULL, NULL))
return_0;
if (!_info(cmd, name_data, dlid_data, 1, 0, info_data, NULL, NULL))
return_0;
return 1;
}
/*
* FIXME: isn't there a simpler, more direct way to just remove these two dm
* devs?
*/
int remove_cache_single_meta_data(struct cmd_context *cmd,
struct dm_info *info_meta, struct dm_info *info_data)
{
struct dm_tree *dtree;
struct dm_tree_node *root;
struct dm_tree_node *child;
const char *uuid;
void *handle = NULL;
if (!(dtree = dm_tree_create()))
goto_out;
if (!dm_tree_add_dev(dtree, info_meta->major, info_meta->minor))
goto_out;
if (!dm_tree_add_dev(dtree, info_data->major, info_data->minor))
goto_out;
if (!(root = dm_tree_find_node(dtree, 0, 0)))
goto_out;
while ((child = dm_tree_next_child(&handle, root, 0))) {
if (!(uuid = dm_tree_node_get_uuid(child))) {
stack;
continue;
}
if (!dm_tree_deactivate_children(root, uuid, strlen(uuid))) {
stack;
continue;
}
}
dm_tree_free(dtree);
return 1;
out:
dm_tree_free(dtree);
return 0;
}
int dev_manager_remove_dm_major_minor(uint32_t major, uint32_t minor)
{
struct dm_task *dmt;
int r = 0;
log_verbose("Removing dm dev %u:%u", major, minor);
if (!(dmt = dm_task_create(DM_DEVICE_REMOVE)))
return_0;
if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) {
log_error("Failed to set device number for remove %u:%u", major, minor);
goto out;
}
r = dm_task_run(dmt);
out:
dm_task_destroy(dmt);
return r;
}
static int _info_by_dev(uint32_t major, uint32_t minor, struct dm_info *info)
{
return _info_run(NULL, info, NULL, 0, 0, 0, major, minor);
}
int dev_manager_info(struct cmd_context *cmd,
const struct logical_volume *lv, const char *layer,
int with_open_count, int with_read_ahead,
struct dm_info *dminfo, uint32_t *read_ahead,
struct lv_seg_status *seg_status)
{
char *dlid, *name;
int r = 0;
if (!(name = dm_build_dm_name(cmd->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(cmd->mem, lv, layer)))
goto_out;
if (!(r = _info(cmd, name, dlid, with_open_count, with_read_ahead,
dminfo, read_ahead, seg_status)))
stack;
out:
dm_pool_free(cmd->mem, name);
return r;
}
static const struct dm_info *_cached_dm_info(struct dm_pool *mem,
struct dm_tree *dtree,
const struct logical_volume *lv,
const char *layer)
{
char *dlid;
const struct dm_tree_node *dnode;
const struct dm_info *dinfo = NULL;
if (!(dlid = build_dm_uuid(mem, lv, layer)))
return_NULL;
if (!(dnode = dm_tree_find_node_by_uuid(dtree, dlid)))
goto out;
if (!(dinfo = dm_tree_node_get_info(dnode))) {
log_warn("WARNING: Cannot get info from tree node for %s.",
display_lvname(lv));
goto out;
}
if (!dinfo->exists)
dinfo = NULL;
out:
dm_pool_free(mem, dlid);
return dinfo;
}
int lv_has_target_type(struct dm_pool *mem, const 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, layer)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, 0, 0, 0, 0, 0, 0)))
goto_bad;
if (!info.exists)
goto_out;
/* If there is a preloaded table, use that in preference. */
if (info.inactive_table) {
dm_task_destroy(dmt);
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, 0, 0, 0, 0, 0, 1)))
goto_bad;
if (!info.exists || !info.inactive_table)
goto_out;
}
do {
next = dm_get_next_target(dmt, next, &start, &length,
&type, &params);
if (type && !strncmp(type, target_type, strlen(target_type))) {
r = 1;
break;
}
} while (next);
out:
dm_task_destroy(dmt);
bad:
dm_pool_free(mem, dlid);
return r;
}
static int _thin_lv_has_device_id(struct dm_pool *mem, const struct logical_volume *lv,
const char *layer, unsigned device_id)
{
char *dlid;
struct dm_task *dmt;
struct dm_info info;
void *next = NULL;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
unsigned id = ~0;
if (!(dlid = build_dm_uuid(mem, lv, layer)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_TABLE, &info, NULL, dlid, 0, 0, 0, 0, 1, 0)))
goto_bad;
if (!info.exists)
goto_out;
/* If there is a preloaded table, use that in preference. */
if (info.inactive_table) {
dm_task_destroy(dmt);
if (!(dmt = _setup_task_run(DM_DEVICE_TABLE, &info, NULL, dlid, 0, 0, 0, 0, 1, 1)))
goto_bad;
if (!info.exists || !info.inactive_table)
goto_out;
}
(void) dm_get_next_target(dmt, next, &start, &length, &type, &params);
if (!type || strcmp(type, TARGET_NAME_THIN))
goto_out;
if (!params || sscanf(params, "%*u:%*u %u", &id) != 1)
goto_out;
log_debug_activation("%soaded thin volume %s with id %u is %smatching id %u.",
info.inactive_table ? "Prel" : "L",
display_lvname(lv), id,
(device_id != id) ? "not " : "", device_id);
out:
dm_task_destroy(dmt);
bad:
dm_pool_free(mem, dlid);
return (device_id == id);
}
int add_linear_area_to_dtree(struct dm_tree_node *node, uint64_t size, uint32_t extent_size,
int use_linear_target, const char *vgname, const char *lvname)
{
uint32_t page_size;
/*
* Use striped or linear target?
*/
if (!use_linear_target) {
page_size = lvm_getpagesize() >> SECTOR_SHIFT;
/*
* We'll use the extent size as the stripe size.
* Extent size and page size are always powers of 2.
* The striped target requires that the stripe size is
* divisible by the page size.
*/
if (extent_size >= page_size) {
/* Use striped target */
if (!dm_tree_node_add_striped_target(node, size, extent_size))
return_0;
return 1;
}
/* Some exotic cases are unsupported by striped. */
log_warn("WARNING: Using linear target for %s/%s: Striped requires extent size "
"(" FMTu32 " sectors) >= page size (" FMTu32 ").",
vgname, lvname, extent_size, page_size);
}
/*
* Use linear target.
*/
if (!dm_tree_node_add_linear_target(node, size))
return_0;
return 1;
}
static dm_percent_range_t _combine_percent(dm_percent_t a, dm_percent_t b,
uint32_t numerator, uint32_t denominator)
{
if (a == LVM_PERCENT_MERGE_FAILED || b == LVM_PERCENT_MERGE_FAILED)
return LVM_PERCENT_MERGE_FAILED;
if (a == DM_PERCENT_INVALID || b == DM_PERCENT_INVALID)
return DM_PERCENT_INVALID;
if (a == DM_PERCENT_100 && b == DM_PERCENT_100)
return DM_PERCENT_100;
if (a == DM_PERCENT_0 && b == DM_PERCENT_0)
return DM_PERCENT_0;
return (dm_percent_range_t) dm_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, dm_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 ? &lv->segments : NULL;
struct lv_segment *seg = NULL;
int first_time = 1;
dm_percent_t percent = DM_PERCENT_INVALID;
uint64_t total_numerator = 0, total_denominator = 0;
struct segment_type *segtype;
*overall_percent = percent;
if (!(segtype = get_segtype_from_string(dm->cmd, target_type)))
return_0;
if (!(dmt = _setup_task_run(wait ? DM_DEVICE_WAITEVENT : DM_DEVICE_STATUS, &info,
name, dlid, event_nr, 0, 0, 0, 0, 0)))
return_0;
if (!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.",
display_lvname(lv));
goto out;
}
seg = dm_list_item(segh, struct lv_segment);
}
if (!type || !params)
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.", display_lvname(lv));
goto out;
}
if (first_time) {
/* above ->target_percent() was not executed! */
/* FIXME why return PERCENT_100 et. al. in this case? */
*overall_percent = DM_PERCENT_100;
if (fail_if_percent_unsupported)
goto_out;
}
log_debug_activation("LV percent: %s",
display_percent(dm->cmd, *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, dm_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;
if (_original_uuid_format_check_required(dm->cmd) &&
_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, const 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_layer(lv);
const struct dm_list *segh = &lv->segments;
struct lv_segment *seg = NULL;
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, NULL, 0, 0, 0, 0, 0)))
return_0;
if (!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.", display_lvname(lv));
goto out;
}
seg = dm_list_item(segh, struct lv_segment);
if (!type || !params)
continue;
if (!seg) {
log_error(INTERNAL_ERROR "Segment is not selected.");
goto out;
}
if (seg->segtype->ops->check_transient_status &&
!seg->segtype->ops->check_transient_status(dm->mem, 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.", display_lvname(lv));
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;
dm->vg_name = vg_name;
/*
* 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);
dm_list_init(&dm->pending_delete);
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,
dm_percent_t *percent)
{
const struct logical_volume *snap_lv;
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;
}
if (lv_is_merging_cow(lv)) {
/* must check percent of origin for a merging snapshot */
snap_lv = origin_from_cow(lv);
} else
snap_lv = lv;
/*
* Build a name for the top layer.
*/
if (!(name = dm_build_dm_name(dm->mem, snap_lv->vg->name, snap_lv->name, NULL)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, snap_lv, NULL)))
return_0;
/*
* Try and get some info on this device.
*/
if (!_percent(dm, name, dlid, TARGET_NAME_SNAPSHOT, 0, NULL, percent,
NULL, fail_if_percent_unsupported))
return_0;
/* 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,
dm_percent_t *percent, uint32_t *event_nr)
{
char *name;
const char *dlid;
const char *target_type = first_seg(lv)->segtype->name;
const char *layer = lv_layer(lv);
/*
* Build a name for the top layer.
*/
if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
log_debug_activation("Getting device %s status percentage for %s.",
target_type, name);
if (!_percent(dm, name, dlid, target_type, wait, lv, percent, event_nr, 0))
return_0;
return 1;
}
int dev_manager_raid_status(struct dev_manager *dm,
const struct logical_volume *lv,
struct dm_status_raid **status)
{
int r = 0;
const char *dlid;
struct dm_task *dmt;
struct dm_info info;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
const char *layer = lv_layer(lv);
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, 0, 0, 0, 0, 0, 0)))
return_0;
if (!info.exists)
goto_out;
dm_get_next_target(dmt, NULL, &start, &length, &type, &params);
if (!type || strcmp(type, TARGET_NAME_RAID)) {
log_error("Expected %s segment type but got %s instead.",
TARGET_NAME_RAID, type ? type : "NULL");
goto out;
}
/* FIXME Check there's only one target */
if (!dm_get_status_raid(dm->mem, params, status))
goto_out;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int dev_manager_raid_message(struct dev_manager *dm,
const struct logical_volume *lv,
const char *msg)
{
int r = 0;
const char *dlid;
struct dm_task *dmt;
const char *layer = lv_layer(lv);
if (!lv_is_raid(lv)) {
log_error(INTERNAL_ERROR "%s is not a RAID logical volume.",
display_lvname(lv));
return 0;
}
/* These are the supported RAID messages for dm-raid v1.9.0 */
if (strcmp(msg, "idle") &&
strcmp(msg, "frozen") &&
strcmp(msg, "resync") &&
strcmp(msg, "recover") &&
strcmp(msg, "check") &&
strcmp(msg, "repair")) {
log_error(INTERNAL_ERROR "Unknown RAID message: %s.", msg);
return 0;
}
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_TARGET_MSG, NULL, NULL, dlid, 0, 0, 0, 0, 1, 0)))
return_0;
if (!dm_task_set_message(dmt, msg))
goto_out;
if (!dm_task_run(dmt))
goto_out;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int dev_manager_writecache_message(struct dev_manager *dm,
const struct logical_volume *lv,
const char *msg)
{
int r = 0;
const char *dlid;
struct dm_task *dmt;
const char *layer = lv_layer(lv);
if (!lv_is_writecache(lv)) {
log_error(INTERNAL_ERROR "%s is not a writecache logical volume.",
display_lvname(lv));
return 0;
}
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_TARGET_MSG, NULL, NULL, dlid, 0, 0, 0, 0, 1, 0)))
return_0;
if (!dm_task_set_message(dmt, msg))
goto_out;
if (!dm_task_run(dmt))
goto_out;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int dev_manager_cache_status(struct dev_manager *dm,
const struct logical_volume *lv,
struct lv_status_cache **status)
{
int r = 0;
const char *dlid;
struct dm_task *dmt;
struct dm_info info;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
struct dm_status_cache *c;
if (!(dlid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if (!(*status = dm_pool_zalloc(dm->mem, sizeof(struct lv_status_cache))))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, 0, 0, 0, 0, 0, 0)))
return_0;
if (!info.exists)
goto_out;
dm_get_next_target(dmt, NULL, &start, &length, &type, &params);
if (!type || strcmp(type, TARGET_NAME_CACHE)) {
log_error("Expected %s segment type but got %s instead.",
TARGET_NAME_CACHE, type ? type : "NULL");
goto out;
}
/*
* FIXME:
* ->target_percent() API is able to transfer only a single value.
* Needs to be able to pass whole structure.
*/
if (!dm_get_status_cache(dm->mem, params, &c))
goto_out;
(*status)->cache = c;
(*status)->mem = dm->mem; /* User has to destroy this mem pool later */
if (c->fail || c->error) {
(*status)->data_usage =
(*status)->metadata_usage =
(*status)->dirty_usage = DM_PERCENT_INVALID;
} else {
(*status)->data_usage = dm_make_percent(c->used_blocks,
c->total_blocks);
(*status)->metadata_usage = dm_make_percent(c->metadata_used_blocks,
c->metadata_total_blocks);
(*status)->dirty_usage = (c->used_blocks) ?
dm_make_percent(c->dirty_blocks,
c->used_blocks) : DM_PERCENT_0;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int dev_manager_thin_pool_status(struct dev_manager *dm,
const struct logical_volume *lv,
struct dm_status_thin_pool **status,
int flush)
{
const char *dlid;
struct dm_task *dmt;
struct dm_info info;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
int r = 0;
/* Build dlid for the thin pool layer */
if (!(dlid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, 0, 0, 0, 0, flush, 0)))
return_0;
if (!info.exists)
goto_out;
dm_get_next_target(dmt, NULL, &start, &length, &type, &params);
/* FIXME Check for thin and check there's exactly one target */
if (!dm_get_status_thin_pool(dm->mem, params, status))
goto_out;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int dev_manager_thin_pool_percent(struct dev_manager *dm,
const struct logical_volume *lv,
int metadata, dm_percent_t *percent)
{
char *name;
const char *dlid;
const char *layer = lv_layer(lv);
/* Build a name for the top layer */
if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
log_debug_activation("Getting device status percentage for %s.", name);
if (!(_percent(dm, name, dlid, TARGET_NAME_THIN_POOL, 0,
(metadata) ? lv : NULL, percent, NULL, 1)))
return_0;
return 1;
}
int dev_manager_thin_percent(struct dev_manager *dm,
const struct logical_volume *lv,
int mapped, dm_percent_t *percent)
{
char *name;
const char *dlid;
const char *layer = lv_layer(lv);
/* Build a name for the top layer */
if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
log_debug_activation("Getting device status percentage for %s", name);
if (!(_percent(dm, name, dlid, TARGET_NAME_THIN, 0,
(mapped) ? NULL : lv, percent, NULL, 1)))
return_0;
return 1;
}
int dev_manager_thin_device_id(struct dev_manager *dm,
const struct logical_volume *lv,
uint32_t *device_id)
{
const char *dlid;
struct dm_task *dmt;
struct dm_info info;
uint64_t start, length;
char *params, *target_type = NULL;
int r = 0;
/* Build dlid for the thin layer */
if (!(dlid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_TABLE, &info, NULL, dlid, 0, 0, 0, 0, 1, 0)))
return_0;
if (!info.exists)
goto_out;
if (dm_get_next_target(dmt, NULL, &start, &length,
&target_type, &params)) {
log_error("More then one table line found for %s.",
display_lvname(lv));
goto out;
}
if (!target_type || strcmp(target_type, TARGET_NAME_THIN)) {
log_error("Unexpected target type %s found for thin %s.",
target_type, display_lvname(lv));
goto out;
}
if (!params || sscanf(params, "%*u:%*u %u", device_id) != 1) {
log_error("Cannot parse table like parameters %s for %s.",
params, display_lvname(lv));
goto out;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
int dev_manager_vdo_pool_status(struct dev_manager *dm,
const struct logical_volume *lv,
struct lv_status_vdo **vdo_status,
int flush)
{
struct lv_status_vdo *status;
const char *dlid;
struct dm_info info;
uint64_t start, length;
struct dm_task *dmt = NULL;
char *type = NULL;
char *params = NULL;
int r = 0;
*vdo_status = NULL;
if (!(status = dm_pool_zalloc(dm->mem, sizeof(struct lv_status_vdo)))) {
log_error("Cannot allocate VDO status structure.");
return 0;
}
if (!(dlid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_STATUS, &info, NULL, dlid, 0, 0, 0, 0, flush, 0)))
return_0;
if (!info.exists)
goto_out;
if (dm_get_next_target(dmt, NULL, &start, &length, &type, &params)) {
log_error("More then one table line found for %s.",
display_lvname(lv));
goto out;
}
if (!type || strcmp(type, TARGET_NAME_VDO)) {
log_error("Expected %s segment type but got %s instead.",
TARGET_NAME_VDO, type ? type : "NULL");
goto out;
}
if (!parse_vdo_pool_status(dm->mem, lv, params, status))
goto_out;
status->mem = dm->mem;
*vdo_status = status;
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/*************************/
/* NEW CODE STARTS HERE */
/*************************/
static int _dev_manager_lv_mknodes(const struct logical_volume *lv)
{
char *name;
if (!(name = dm_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);
}
static int _lv_has_mknode(const struct logical_volume *lv)
{
return (lv_is_visible(lv) &&
(!lv_is_thin_pool(lv) || lv_is_new_thin_pool(lv)));
}
int dev_manager_mknodes(const struct logical_volume *lv)
{
struct dm_info dminfo;
struct dm_task *dmt;
char *name;
int r = 0;
if (!(name = dm_build_dm_name(lv->vg->cmd->mem, lv->vg->name, lv->name, NULL)))
return_0;
if (!(dmt = _setup_task_run(DM_DEVICE_MKNODES, &dminfo, name, NULL, 0, 0, 0, 0, 0, 0)))
return_0;
if (dminfo.exists) {
/* read-only component LV is also made visible */
if (_lv_has_mknode(lv) || (dminfo.read_only && lv_is_component(lv)))
r = _dev_manager_lv_mknodes(lv);
} else
r = _dev_manager_lv_rmnodes(lv);
dm_task_destroy(dmt);
return r;
}
#ifdef UDEV_SYNC_SUPPORT
/*
* Until the DM_UEVENT_GENERATED_FLAG was introduced in kernel patch
* 856a6f1dbd8940e72755af145ebcd806408ecedd
* some operations could not be performed by udev, requiring our fallback code.
*/
static int _dm_driver_has_stable_udev_support(void)
{
char vsn[80];
unsigned maj, min, patchlevel;
return driver_version(vsn, sizeof(vsn)) &&
(sscanf(vsn, "%u.%u.%u", &maj, &min, &patchlevel) == 3) &&
(maj == 4 ? min >= 18 : maj > 4);
}
static int _check_udev_fallback(struct cmd_context *cmd)
{
struct config_info *settings = &cmd->current_settings;
if (settings->udev_fallback != -1)
goto out;
/*
* Use udev fallback automatically in case udev
* is disabled via DM_DISABLE_UDEV environment
* variable or udev rules are switched off.
*/
settings->udev_fallback = !settings->udev_rules ? 1 :
find_config_tree_bool(cmd, activation_verify_udev_operations_CFG, NULL);
/* Do not rely fully on udev if the udev support is known to be incomplete. */
if (!settings->udev_fallback && !_dm_driver_has_stable_udev_support()) {
log_very_verbose("Kernel driver has incomplete udev support so "
"LVM will check and perform some operations itself.");
settings->udev_fallback = 1;
}
out:
return settings->udev_fallback;
}
#else /* UDEV_SYNC_SUPPORT */
static int _check_udev_fallback(struct cmd_context *cmd)
{
/* We must use old node/symlink creation code if not compiled with udev support at all! */
return cmd->current_settings.udev_fallback = 1;
}
#endif /* UDEV_SYNC_SUPPORT */
static uint16_t _get_udev_flags(struct dev_manager *dm, const struct logical_volume *lv,
const char *layer, int noscan, int temporary,
int visible_component)
{
uint16_t udev_flags = 0;
/*
* Instruct also libdevmapper to disable udev
* fallback in accordance to LVM2 settings.
*/
if (!_check_udev_fallback(dm->cmd))
udev_flags |= DM_UDEV_DISABLE_LIBRARY_FALLBACK;
/*
* Is this top-level and visible device?
* If not, create just the /dev/mapper content.
*/
/* FIXME: add target's method for this */
if (lv_is_new_thin_pool(lv) || visible_component)
/* New thin-pool is regular LV with -tpool UUID suffix. */
udev_flags |= DM_UDEV_DISABLE_DISK_RULES_FLAG |
DM_UDEV_DISABLE_OTHER_RULES_FLAG;
else if (layer || !lv_is_visible(lv) || lv_is_thin_pool(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;
/*
* LVM subsystem specific flags.
*/
if (noscan)
udev_flags |= DM_SUBSYSTEM_UDEV_FLAG0;
if (temporary)
udev_flags |= DM_UDEV_DISABLE_DISK_RULES_FLAG |
DM_UDEV_DISABLE_OTHER_RULES_FLAG;
return udev_flags;
}
static int _add_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const struct logical_volume *lv, int origin_only);
static int _check_holder(struct dev_manager *dm, struct dm_tree *dtree,
const struct logical_volume *lv, uint32_t major,
const char *d_name)
{
const char *default_uuid_prefix = dm_uuid_prefix();
const size_t default_uuid_prefix_len = strlen(default_uuid_prefix);
const char *name;
const char *uuid;
struct dm_info info;
struct dm_task *dmt;
struct logical_volume *lv_det;
union lvid id;
int dev, r = 0;
errno = 0;
dev = strtoll(d_name + 3, NULL, 10);
if (errno) {
log_error("Failed to parse dm device minor number from %s.", d_name);
return 0;
}
if (!(dmt = _setup_task_run(DM_DEVICE_INFO, &info, NULL, NULL, NULL,
major, dev, 0, 0, 0)))
return_0;
if (info.exists) {
uuid = dm_task_get_uuid(dmt);
name = dm_task_get_name(dmt);
log_debug_activation("Checking holder of %s %s (" FMTu32 ":" FMTu32 ") %s.",
display_lvname(lv), uuid, info.major, info.minor,
name);
/* Skip common uuid prefix */
if (!strncmp(default_uuid_prefix, uuid, default_uuid_prefix_len))
uuid += default_uuid_prefix_len;
if (!strncmp(uuid, (char*)&lv->vg->id, sizeof(lv->vg->id)) &&
!dm_tree_find_node_by_uuid(dtree, uuid)) {
/* trims any UUID suffix (i.e. -cow) */
(void) dm_strncpy((char*)&id, uuid, 2 * sizeof(struct id) + 1);
/* If UUID is not yet in dtree, look for matching LV */
if (!(lv_det = find_lv_in_vg_by_lvid(lv->vg, &id))) {
log_error("Cannot find holder with device name %s in VG %s.",
name, lv->vg->name);
goto out;
}
if (lv_is_cow(lv_det))
lv_det = origin_from_cow(lv_det);
log_debug_activation("Found holder %s of %s.",
display_lvname(lv_det),
display_lvname(lv));
if (!_add_lv_to_dtree(dm, dtree, lv_det, 0))
goto_out;
}
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/*
* Add exiting devices which holds given LV device open.
* This is used in case when metadata already do not contain information
* i.e. PVMOVE is being finished and final table is going to be resumed.
*/
static int _add_holders_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const struct logical_volume *lv, struct dm_info *info)
{
const char *sysfs_dir = dm_sysfs_dir();
char sysfs_path[PATH_MAX];
struct dirent *dirent;
DIR *d;
int r = 0;
/* Sysfs path of holders */
if (dm_snprintf(sysfs_path, sizeof(sysfs_path), "%sblock/dm-" FMTu32
"/holders", sysfs_dir, info->minor) < 0) {
log_error("sysfs_path dm_snprintf failed.");
return 0;
}
if (!(d = opendir(sysfs_path))) {
log_sys_error("opendir", sysfs_path);
return 0;
}
while ((dirent = readdir(d)))
/* Expects minor is added to 'dm-' prefix */
if (!strncmp(dirent->d_name, "dm-", 3) &&
!_check_holder(dm, dtree, lv, info->major, dirent->d_name))
goto_out;
r = 1;
out:
if (closedir(d))
log_sys_debug("closedir", "holders");
return r;
}
static int _add_dev_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const struct logical_volume *lv, const char *layer)
{
char *dlid, *name;
struct dm_info info, info2;
if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, lv, layer)))
return_0;
if (!_info(dm->cmd, name, dlid, 1, 0, &info, NULL, NULL))
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 && ((int) info.minor != lv->minor)) {
log_error("Volume %s (%" PRIu32 ":%" PRIu32")"
" differs from already active device "
"(%" PRIu32 ":%" PRIu32").",
display_lvname(lv), 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,
0, 0, 0))) {
log_error("Failed to add device (%" PRIu32 ":%" PRIu32") to dtree.",
info.major, info.minor);
return 0;
}
if (info.exists && dm->track_pending_delete) {
log_debug_activation("Tracking pending delete for %s (%s).",
display_lvname(lv), dlid);
if (!str_list_add(dm->mem, &dm->pending_delete, dlid))
return_0;
}
/*
* Find holders of existing active LV where name starts with 'pvmove',
* but it's not anymore PVMOVE LV and also it's not PVMOVE _mimage
*/
if (info.exists && !lv_is_pvmove(lv) &&
!strchr(lv->name, '_') && !strncmp(lv->name, "pvmove", 6))
if (!_add_holders_to_dtree(dm, dtree, lv, &info))
return_0;
return 1;
}
struct pool_cb_data {
struct dev_manager *dm;
const struct logical_volume *pool_lv;
int skip_zero; /* to skip zeroed device header (check first 64B) */
int exec; /* which binary to call */
int opts;
struct {
unsigned maj;
unsigned min;
unsigned patch;
} version;
const char *global;
};
/*
* Simple version of check function calling 'tool -V'
*
* Returns 1 if the tool's version is equal or better to given.
* Otherwise it returns 0.
*/
static int _check_tool_version(struct cmd_context *cmd, const char *tool,
unsigned maj, unsigned min, unsigned patch)
{
const char *argv[] = { tool, "-V", NULL };
struct pipe_data pdata;
FILE *f;
char buf[128] = { 0 };
char *nl;
unsigned v_maj, v_min, v_patch;
int ret = 0;
if (!(f = pipe_open(cmd, argv, 0, &pdata))) {
log_warn("WARNING: Cannot read output from %s.", argv[0]);
} else {
if (fgets(buf, sizeof(buf) - 1, f) &&
(sscanf(buf, "%u.%u.%u", &v_maj, &v_min, &v_patch) == 3)) {
if ((v_maj > maj) ||
((v_maj == maj) &&
((v_min > min) ||
(v_min == min && v_patch >= patch))))
ret = 1;
if ((nl = strchr(buf, '\n')))
nl[0] = 0; /* cut newline away */
log_verbose("Found version of %s %s is %s then requested %u.%u.%u.",
argv[0], buf, ret ? "better" : "older", maj, min, patch);
} else
log_warn("WARNING: Cannot parse output '%s' from %s.", buf, argv[0]);
(void) pipe_close(&pdata);
}
return ret;
}
static int _pool_callback(struct dm_tree_node *node,
dm_node_callback_t type, void *cb_data)
{
int ret, status = 0, fd;
const struct dm_config_node *cn;
const struct dm_config_value *cv;
const struct pool_cb_data *data = cb_data;
const struct logical_volume *pool_lv = data->pool_lv;
const struct logical_volume *mlv = first_seg(pool_lv)->metadata_lv;
long buf[64 / sizeof(long)]; /* buffer for short disk header (64B) */
int args = 0;
char *mpath;
const char *argv[19] = { /* Max supported 15 args */
find_config_tree_str_allow_empty(pool_lv->vg->cmd, data->exec, NULL)
};
if (!*argv[0]) /* *_check tool is unconfigured/disabled with "" setting */
return 1;
if (!(mpath = lv_dmpath_dup(data->dm->mem, mlv))) {
log_error("Failed to build device path for checking pool metadata %s.",
display_lvname(mlv));
return 0;
}
if (data->skip_zero) {
if ((fd = open(mpath, O_RDONLY)) < 0) {
log_sys_error("open", mpath);
return 0;
}
/* let's assume there is no problem to read 64 bytes */
if (read(fd, buf, sizeof(buf)) < (int)sizeof(buf)) {
log_sys_error("read", mpath);
if (close(fd))
log_sys_error("close", mpath);
return 0;
}
for (ret = 0; ret < (int) DM_ARRAY_SIZE(buf); ++ret)
if (buf[ret])
break;
if (close(fd))
log_sys_error("close", mpath);
if (ret == (int) DM_ARRAY_SIZE(buf)) {
log_debug_activation("Metadata checking skipped, detected empty disk header on %s.",
mpath);
return 1;
}
}
if (!(cn = find_config_tree_array(mlv->vg->cmd, data->opts, NULL))) {
log_error(INTERNAL_ERROR "Unable to find configuration for pool check options.");
return 0;
}
for (cv = cn->v; cv && args < 16; cv = cv->next) {
if (cv->type != DM_CFG_STRING) {
log_error("Invalid string in config file: "
"global/%s_check_options.",
data->global);
return 0;
}
argv[++args] = cv->v.str;
}
if (args == 16) {
log_error("Too many options for %s command.", argv[0]);
return 0;
}
argv[++args] = mpath;
if (!(ret = exec_cmd(pool_lv->vg->cmd, (const char * const *)argv,
&status, 0))) {
if (status == ENOENT) {
log_warn("WARNING: Check is skipped, please install recommended missing binary %s!",
argv[0]);
return 1;
}
if ((data->version.maj || data->version.min || data->version.patch) &&
!_check_tool_version(pool_lv->vg->cmd, argv[0],
data->version.maj, data->version.min, data->version.patch)) {
log_warn("WARNING: Check is skipped, please upgrade installed version of %s!",
argv[0]);
return 1;
}
switch (type) {
case DM_NODE_CALLBACK_PRELOADED:
log_err_once("Check of pool %s failed (status:%d). "
"Manual repair required!",
display_lvname(pool_lv), status);
break;
default:
log_warn("WARNING: Integrity check of metadata for pool "
"%s failed.", display_lvname(pool_lv));
}
/*
* FIXME: What should we do here??
*
* Maybe mark the node, so it's not activating
* as pool but as error/linear and let the
* dm tree resolve the issue.
*/
}
return ret;
}
static int _pool_register_callback(struct dev_manager *dm,
struct dm_tree_node *node,
const struct logical_volume *lv)
{
struct pool_cb_data *data;
/* Do not skip metadata of testing even for unused thin pools */
#if 0
/* Skip metadata testing for unused thin pool. */
if (lv_is_thin_pool(lv) &&
(!first_seg(lv)->transaction_id ||
((first_seg(lv)->transaction_id == 1) &&
pool_has_message(first_seg(lv), NULL, 0))))
return 1;
#endif
/* Skip for single-device cache pool */
if (lv_is_cache(lv) && lv_is_cache_single(first_seg(lv)->pool_lv))
return 1;
if (!(data = dm_pool_zalloc(dm->mem, sizeof(*data)))) {
log_error("Failed to allocated path for callback.");
return 0;
}
data->dm = dm;
if (lv_is_thin_pool(lv)) {
data->pool_lv = lv;
data->skip_zero = 1;
data->exec = global_thin_check_executable_CFG;
data->opts = global_thin_check_options_CFG;
data->global = "thin";
} else if (lv_is_cache(lv)) { /* cache pool */
data->pool_lv = first_seg(lv)->pool_lv;
data->skip_zero = 1; /* cheap read-error detection */
data->exec = global_cache_check_executable_CFG;
data->opts = global_cache_check_options_CFG;
data->global = "cache";
if (first_seg(first_seg(lv)->pool_lv)->cache_metadata_format > 1) {
data->version.maj = 0;
data->version.min = 7;
}
} else {
log_error(INTERNAL_ERROR "Registering unsupported pool callback.");
return 0;
}
dm_tree_node_set_callback(node, _pool_callback, data);
return 1;
}
/* Declaration to resolve suspend tree and message passing for thin-pool */
static int _add_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
struct lv_segment *seg,
struct lv_activate_opts *laopts);
/*
* Add LV and any known dependencies
*/
static int _add_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const struct logical_volume *lv, int origin_only)
{
uint32_t s;
struct seg_list *sl;
struct dm_list *snh;
struct lv_segment *seg;
struct dm_tree_node *node;
const char *uuid;
const struct logical_volume *plv;
if (lv_is_pvmove(lv) && (dm->track_pvmove_deps == 2))
return 1; /* Avoid rechecking of already seen pvmove LV */
if (lv_is_cache_pool(lv)) {
if (!dm_list_empty(&lv->segs_using_this_lv)) {
if (!_add_lv_to_dtree(dm, dtree, seg_lv(first_seg(lv), 0), 0))
return_0;
if (!_add_lv_to_dtree(dm, dtree, first_seg(lv)->metadata_lv, 0))
return_0;
/* Cache pool does not have a real device node */
return 1;
}
/* Unused cache pool is activated as metadata */
}
if (lv_is_cache(lv) && lv_is_cache_single(first_seg(lv)->pool_lv) && dm->activation) {
struct logical_volume *pool_lv = first_seg(lv)->pool_lv;
struct lv_segment *lvseg = first_seg(lv);
struct dm_info info_meta;
struct dm_info info_data;
union lvid lvid_meta;
union lvid lvid_data;
char *name_meta;
char *name_data;
char *dlid_meta;
char *dlid_data;
memset(&lvid_meta, 0, sizeof(lvid_meta));
memset(&lvid_data, 0, sizeof(lvid_meta));
memcpy(&lvid_meta.id[0], &lv->vg->id, sizeof(struct id));
memcpy(&lvid_meta.id[1], &lvseg->metadata_id, sizeof(struct id));
memcpy(&lvid_data.id[0], &lv->vg->id, sizeof(struct id));
memcpy(&lvid_data.id[1], &lvseg->data_id, sizeof(struct id));
if (!(dlid_meta = dm_build_dm_uuid(dm->mem, UUID_PREFIX, (const char *)&lvid_meta.s, NULL)))
return_0;
if (!(dlid_data = dm_build_dm_uuid(dm->mem, UUID_PREFIX, (const char *)&lvid_data.s, NULL)))
return_0;
if (!(name_meta = dm_build_dm_name(dm->mem, lv->vg->name, pool_lv->name, "_cmeta")))
return_0;
if (!(name_data = dm_build_dm_name(dm->mem, lv->vg->name, pool_lv->name, "_cdata")))
return_0;
if (!_info(dm->cmd, name_meta, dlid_meta, 1, 0, &info_meta, NULL, NULL))
return_0;
if (!_info(dm->cmd, name_data, dlid_data, 1, 0, &info_data, NULL, NULL))
return_0;
if (info_meta.exists &&
!dm_tree_add_dev_with_udev_flags(dtree, info_meta.major, info_meta.minor,
_get_udev_flags(dm, lv, NULL, 0, 0, 0))) {
log_error("Failed to add device (%" PRIu32 ":%" PRIu32") to dtree.", info_meta.major, info_meta.minor);
}
if (info_data.exists &&
!dm_tree_add_dev_with_udev_flags(dtree, info_data.major, info_data.minor,
_get_udev_flags(dm, lv, NULL, 0, 0, 0))) {
log_error("Failed to add device (%" PRIu32 ":%" PRIu32") to dtree.", info_data.major, info_data.minor);
}
}
if (!origin_only && !_add_dev_to_dtree(dm, dtree, lv, NULL))
return_0;
/* FIXME Can we avoid doing this every time? */
/* Reused also for lv_is_external_origin(lv) */
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 (origin_only && lv_is_thin_volume(lv)) {
if (!_add_dev_to_dtree(dm, dtree, lv, lv_layer(lv)))
return_0;
#if 0
/* ? Use origin_only to avoid 'deep' thin pool suspend ? */
/* FIXME Implement dm_tree_node_skip_childrens optimisation */
if (!(uuid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if ((node = dm_tree_find_node_by_uuid(dtree, uuid)))
dm_tree_node_skip_childrens(node, 1);
#endif
}
if (origin_only && dm->activation && dm->track_external_lv_deps &&
lv_is_external_origin(lv)) {
/* Find possible users of external origin lv */
dm->track_external_lv_deps = 0; /* avoid recursion */
dm_list_iterate_items(sl, &lv->segs_using_this_lv)
/* Match only external_lv users */
if ((sl->seg->external_lv == lv) &&
!_add_lv_to_dtree(dm, dtree, sl->seg->lv, 1))
return_0;
dm->track_external_lv_deps = 1;
}
if (lv_is_thin_pool(lv)) {
/*
* For both origin_only and !origin_only
* skips test for -tpool-real and tpool-cow
*/
if (!_add_dev_to_dtree(dm, dtree, lv, lv_layer(lv)))
return_0;
/*
* TODO: change API and move this code
* Could be easier to handle this in _add_dev_to_dtree()
* and base this according to info.exists ?
*/
if (!dm->activation) {
if (!(uuid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if ((node = dm_tree_find_node_by_uuid(dtree, uuid))) {
if (origin_only) {
struct lv_activate_opts laopts = {
.origin_only = 1,
.send_messages = 1 /* Node with messages */
};
/*
* Add some messsages if right node exist in the table only
* when building SUSPEND tree for origin-only thin-pool.
*
* TODO: Fix call of '_add_target_to_dtree()' to add message
* to thin-pool node as we already know the pool node exists
* in the table. Any better/cleaner API way ?
*
* Probably some 'new' target method to add messages for any node?
*/
if (dm->suspend &&
!dm_list_empty(&(first_seg(lv)->thin_messages)) &&
!_add_target_to_dtree(dm, node, first_seg(lv), &laopts))
return_0;
} else {
/* Setup callback for non-activation partial tree */
/* Activation gets own callback when needed */
/* TODO: extend _cached_dm_info() to return dnode */
if (!_pool_register_callback(dm, node, lv))
return_0;
}
}
}
}
if (lv_is_cache(lv)) {
if (!origin_only && !dm->activation && !dm->track_pending_delete) {
/* Setup callback for non-activation partial tree */
/* Activation gets own callback when needed */
/* TODO: extend _cached_dm_info() to return dnode */
if (!(uuid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
if ((node = dm_tree_find_node_by_uuid(dtree, uuid)) &&
!_pool_register_callback(dm, node, lv))
return_0;
}
}
/* Add any snapshots of this LV */
if (!origin_only && lv_is_origin(lv))
dm_list_iterate(snh, &lv->snapshot_segs)
if (!_add_lv_to_dtree(dm, dtree, dm_list_struct_base(snh, struct lv_segment, origin_list)->cow, 0))
return_0;
if (dm->activation && !origin_only && lv_is_merging_origin(lv) &&
!_add_lv_to_dtree(dm, dtree, find_snapshot(lv)->lv, 1))
return_0;
/* Add any LVs referencing a PVMOVE LV unless told not to. */
if ((dm->track_pvmove_deps == 1) && lv_is_pvmove(lv)) {
dm->track_pvmove_deps = 2; /* Mark as already seen */
dm_list_iterate_items(sl, &lv->segs_using_this_lv) {
/* If LV is snapshot COW - whole snapshot needs reload */
plv = lv_is_cow(sl->seg->lv) ? origin_from_cow(sl->seg->lv) : sl->seg->lv;
if (!_add_lv_to_dtree(dm, dtree, plv, 0))
return_0;
}
dm->track_pvmove_deps = 1;
}
if (!dm->track_pending_delete)
dm_list_iterate_items(sl, &lv->segs_using_this_lv) {
if (lv_is_pending_delete(sl->seg->lv)) {
/* LV is referenced by 'cache pending delete LV */
dm->track_pending_delete = 1;
if (!_add_lv_to_dtree(dm, dtree, sl->seg->lv, origin_only))
return_0;
dm->track_pending_delete = 0;
}
}
/* Add any LVs used by segments in this LV */
dm_list_iterate_items(seg, &lv->segments) {
if (seg->external_lv && dm->track_external_lv_deps &&
!_add_lv_to_dtree(dm, dtree, seg->external_lv, 1)) /* stack */
return_0;
if (seg->log_lv &&
!_add_lv_to_dtree(dm, dtree, seg->log_lv, 0))
return_0;
if (seg->metadata_lv &&
!_add_lv_to_dtree(dm, dtree, seg->metadata_lv, 0))
return_0;
if (seg->writecache && seg_is_writecache(seg)) {
if (!_add_lv_to_dtree(dm, dtree, seg->writecache, dm->activation ? origin_only : 1))
return_0;
}
if (seg->pool_lv &&
(lv_is_cache_pool(seg->pool_lv) || lv_is_cache_single(seg->pool_lv) || dm->track_external_lv_deps) &&
/* When activating and not origin_only detect linear 'overlay' over pool */
!_add_lv_to_dtree(dm, dtree, seg->pool_lv, dm->activation ? origin_only : 1))
return_0;
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) == AREA_LV && seg_lv(seg, s) &&
/* origin only for cache without pending delete */
(!dm->track_pending_delete || !lv_is_cache(lv)) &&
!_add_lv_to_dtree(dm, dtree, seg_lv(seg, s), 0))
return_0;
if (seg_is_raid_with_meta(seg) && seg->meta_areas && seg_metalv(seg, s) &&
!_add_lv_to_dtree(dm, dtree, seg_metalv(seg, s), 0))
return_0;
}
/* When activating, detect merging LV presence */
if (dm->activation && seg->merge_lv &&
!_add_lv_to_dtree(dm, dtree, seg->merge_lv, 1))
return_0;
}
return 1;
}
static struct dm_tree *_create_partial_dtree(struct dev_manager *dm, const struct logical_volume *lv, int origin_only)
{
struct dm_tree *dtree;
if (!(dtree = dm_tree_create())) {
log_debug_activation("Partial dtree creation failed for %s.",
display_lvname(lv));
return NULL;
}
dm_tree_set_optional_uuid_suffixes(dtree, &uuid_suffix_list[0]);
if (!_add_lv_to_dtree(dm, dtree, lv, (lv_is_origin(lv) || lv_is_thin_volume(lv) || lv_is_thin_pool(lv)) ? origin_only : 0))
goto_bad;
return dtree;
bad:
dm_tree_free(dtree);
return NULL;
}
static char *_add_error_or_zero_device(struct dev_manager *dm, struct dm_tree *dtree,
struct lv_segment *seg, int s, int use_zero)
{
char *dlid, *name;
char errid[32];
struct dm_tree_node *node;
struct lv_segment *seg_i;
struct dm_info info;
int segno = -1, i = 0;
uint64_t size = (uint64_t) _seg_len(seg) * seg->lv->vg->extent_size;
dm_list_iterate_items(seg_i, &seg->lv->segments) {
if (seg == seg_i) {
segno = i;
break;
}
++i;
}
if (segno < 0) {
log_error(INTERNAL_ERROR "_add_error_or_zero_device called with bad segment.");
return NULL;
}
sprintf(errid, "missing_%d_%d", segno, s);
if (!(dlid = build_dm_uuid(dm->mem, seg->lv, errid)))
return_NULL;
if (!(name = dm_build_dm_name(dm->mem, seg->lv->vg->name,
seg->lv->name, errid)))
return_NULL;
if (!_info(dm->cmd, name, dlid, 1, 0, &info, NULL, NULL))
return_NULL;
if (!info.exists) {
/* Create new node */
if (!(node = dm_tree_add_new_dev(dtree, name, dlid, 0, 0, 0, 0, 0)))
return_NULL;
if (use_zero) {
if (!dm_tree_node_add_zero_target(node, size))
return_NULL;
} else
if (!dm_tree_node_add_error_target(node, size))
return_NULL;
} else {
/* Already exists */
if (!dm_tree_add_dev(dtree, info.major, info.minor)) {
log_error("Failed to add device (%" PRIu32 ":%" PRIu32") to dtree.",
info.major, info.minor);
return NULL;
}
}
return dlid;
}
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;
int use_zero = !strcmp(dm->cmd->stripe_filler, TARGET_NAME_ZERO) ? 1 : 0;
if (!strcmp(dm->cmd->stripe_filler, TARGET_NAME_ERROR) || use_zero) {
/*
* 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;
if (!(dlid = _add_error_or_zero_device(dm, *tree, seg, s, use_zero)))
return_0;
if (!dm_tree_node_add_target_area(node, NULL, dlid, extent_size * seg_le(seg, s)))
return_0;
} else
if (!dm_tree_node_add_target_area(node, dm->cmd->stripe_filler, NULL, UINT64_C(0)))
return_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;
struct stat info;
const char *name;
unsigned num_error_areas = 0;
unsigned num_existing_areas = 0;
/* FIXME Avoid repeating identical stat in dm_tree_node_add_target_area */
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) ||
!(name = dev_name(seg_dev(seg, s))) || !*name ||
stat(name, &info) < 0 || !S_ISBLK(info.st_mode))) ||
(seg_type(seg, s) == AREA_LV && !seg_lv(seg, s))) {
if (!seg->lv->vg->cmd->partial_activation) {
if (!seg->lv->vg->cmd->degraded_activation ||
!lv_is_raid_type(seg->lv)) {
log_error("Aborting. LV %s is now incomplete "
"and '--activationmode partial' was not specified.",
display_lvname(seg->lv));
return 0;
}
}
if (!_add_error_area(dm, node, seg, s))
return_0;
num_error_areas++;
} else if (seg_type(seg, s) == AREA_PV) {
if (!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)))))
return_0;
num_existing_areas++;
} else if (seg_is_raid(seg)) {
/*
* RAID can handle unassigned areas. It simple puts
* '- -' in for the metadata/data device pair. This
* is a valid way to indicate to the RAID target that
* the device is missing.
*
* If an image is marked as VISIBLE_LV and !LVM_WRITE,
* it means the device has temporarily been extracted
* from the array. It may come back at a future date,
* so the bitmap must track differences. Again, '- -'
* is used in the CTR table.
*/
if ((seg_type(seg, s) == AREA_UNASSIGNED) ||
(lv_is_visible(seg_lv(seg, s)) &&
!(seg_lv(seg, s)->status & LVM_WRITE))) {
/* One each for metadata area and data area */
if (!dm_tree_node_add_null_area(node, 0) ||
!dm_tree_node_add_null_area(node, 0))
return_0;
continue;
}
if (seg->meta_areas && seg_metalv(seg, s)) {
if (!(dlid = build_dm_uuid(dm->mem, seg_metalv(seg, s), NULL)))
return_0;
if (!dm_tree_node_add_target_area(node, NULL, dlid, extent_size * seg_metale(seg, s)))
return_0;
} else if (!dm_tree_node_add_null_area(node, 0))
return_0;
if (!(dlid = build_dm_uuid(dm->mem, seg_lv(seg, s), NULL)))
return_0;
if (!dm_tree_node_add_target_area(node, NULL, dlid, extent_size * seg_le(seg, s)))
return_0;
} else if (seg_type(seg, s) == AREA_LV) {
if (!(dlid = build_dm_uuid(dm->mem, seg_lv(seg, s), NULL)))
return_0;
if (!dm_tree_node_add_target_area(node, NULL, dlid, extent_size * seg_le(seg, s)))
return_0;
} else {
log_error(INTERNAL_ERROR "Unassigned area found in LV %s.",
display_lvname(seg->lv));
return 0;
}
}
if (num_error_areas) {
/* Thins currently do not support partial activation */
if (lv_is_thin_type(seg->lv)) {
log_error("Cannot activate %s: pool incomplete.",
display_lvname(seg->lv));
return 0;
}
}
return 1;
}
static int _add_layer_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
const struct logical_volume *lv)
{
const char *layer_dlid;
if (!(layer_dlid = build_dm_uuid(dm->mem, lv, lv_layer(lv))))
return_0;
/* Add linear mapping over layered LV */
if (!add_linear_area_to_dtree(dnode, lv->size, lv->vg->extent_size,
lv->vg->cmd->use_linear_target,
lv->vg->name, lv->name) ||
!dm_tree_node_add_target_area(dnode, NULL, layer_dlid, 0))
return_0;
return 1;
}
static int _add_origin_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
const struct logical_volume *lv)
{
const char *real_dlid;
if (!(real_dlid = build_dm_uuid(dm->mem, lv, "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,
const struct logical_volume *lv)
{
const char *origin_dlid, *cow_dlid, *merge_dlid;
struct lv_segment *merging_snap_seg = find_snapshot(lv);
if (!lv_is_merging_origin(lv)) {
log_error(INTERNAL_ERROR "LV %s is not merging snapshot.",
display_lvname(lv));
return 0;
}
if (!(origin_dlid = build_dm_uuid(dm->mem, lv, "real")))
return_0;
if (!(cow_dlid = build_dm_uuid(dm->mem, merging_snap_seg->cow, "cow")))
return_0;
if (!(merge_dlid = build_dm_uuid(dm->mem, merging_snap_seg->cow, NULL)))
return_0;
if (!dm_tree_node_add_snapshot_merge_target(dnode, lv->size, origin_dlid,
cow_dlid, merge_dlid,
merging_snap_seg->chunk_size))
return_0;
return 1;
}
static int _add_snapshot_target_to_dtree(struct dev_manager *dm,
struct dm_tree_node *dnode,
const 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_snapshot(lv))) {
log_error("Couldn't find snapshot for '%s'.",
display_lvname(lv));
return 0;
}
if (!(origin_dlid = build_dm_uuid(dm->mem, snap_seg->origin, "real")))
return_0;
if (!(cow_dlid = build_dm_uuid(dm->mem, snap_seg->cow, "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.", lvseg_name(seg));
return 0;
}
return seg->segtype->ops->add_target_line(dm, dm->mem, dm->cmd,
&dm->target_state, seg,
laopts, dnode,
extent_size * _seg_len(seg),
&dm->pvmove_mirror_count);
}
static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const struct logical_volume *lv,
struct lv_activate_opts *laopts,
const char *layer);
static int _add_new_external_lv_to_dtree(struct dev_manager *dm,
struct dm_tree *dtree,
struct logical_volume *external_lv,
struct lv_activate_opts *laopts)
{
struct seg_list *sl;
/* Do not want to recursively add externals again */
if (!dm->track_external_lv_deps)
return 1;
/*
* Any LV can have only 1 external origin, so we will
* process all LVs related to this LV, and we want to
* skip repeated invocation of external lv processing
*/
dm->track_external_lv_deps = 0;
log_debug_activation("Adding external origin LV %s and all active users.",
display_lvname(external_lv));
if (!_add_new_lv_to_dtree(dm, dtree, external_lv, laopts,
lv_layer(external_lv)))
return_0;
/*
* Add all ACTIVE LVs using this external origin LV. This is
* needed because of conversion of thin which could have been
* also an old-snapshot to external origin.
*/
dm_list_iterate_items(sl, &external_lv->segs_using_this_lv)
if ((sl->seg->external_lv == external_lv) &&
/* Add only active layered devices (also avoids loop) */
_cached_dm_info(dm->mem, dtree, sl->seg->lv,
lv_layer(sl->seg->lv)) &&
!_add_new_lv_to_dtree(dm, dtree, sl->seg->lv,
laopts, lv_layer(sl->seg->lv)))
return_0;
log_debug_activation("Finished adding external origin LV %s and all active users.",
display_lvname(external_lv));
dm->track_external_lv_deps = 1;
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 lv_segment *seg_present;
const struct segment_type *segtype;
const char *target_name;
/* Ensure required device-mapper targets are loaded */
seg_present = find_snapshot(seg->lv) ? : seg;
segtype = seg_present->segtype;
target_name = (segtype->ops->target_name ?
segtype->ops->target_name(seg_present, laopts) :
segtype->name);
log_debug_activation("Checking kernel supports %s segment type for %s%s%s",
target_name, display_lvname(seg->lv),
layer ? "-" : "", layer ? : "");
if (segtype->ops->target_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?", display_lvname(seg->lv), target_name);
return 0;
}
/* Add external origin layer */
if (seg->external_lv &&
!_add_new_external_lv_to_dtree(dm, dtree, seg->external_lv, laopts))
return_0;
/* Add mirror log */
if (seg->log_lv &&
!_add_new_lv_to_dtree(dm, dtree, seg->log_lv, laopts, NULL))
return_0;
/* Add pool metadata */
if (seg->metadata_lv &&
!_add_new_lv_to_dtree(dm, dtree, seg->metadata_lv, laopts, NULL))
return_0;
/* Add pool layer */
if (seg->pool_lv && !laopts->origin_only &&
!_add_new_lv_to_dtree(dm, dtree, seg->pool_lv, laopts,
lv_layer(seg->pool_lv)))
return_0;
if (seg->writecache && !laopts->origin_only &&
!_add_new_lv_to_dtree(dm, dtree, seg->writecache, laopts,
lv_layer(seg->writecache)))
return_0;
/* Add any LVs used by this segment */
for (s = 0; s < seg->area_count; ++s) {
if ((seg_type(seg, s) == AREA_LV) &&
/* do not bring up tracked image */
!lv_is_raid_image_with_tracking(seg_lv(seg, s)) &&
/* origin only for cache without pending delete */
(!dm->track_pending_delete || !seg_is_cache(seg)) &&
!_add_new_lv_to_dtree(dm, dtree, seg_lv(seg, s),
laopts, NULL))
return_0;
if (seg_is_raid_with_meta(seg) && seg->meta_areas && seg_metalv(seg, s) &&
!lv_is_raid_image_with_tracking(seg_lv(seg, s)) &&
!_add_new_lv_to_dtree(dm, dtree, seg_metalv(seg, s),
laopts, NULL))
return_0;
}
if (dm->track_pending_delete) {
/* Replace target and all its used devs with error mapping */
log_debug_activation("Using error for pending delete %s.",
display_lvname(seg->lv));
if (!dm_tree_node_add_error_target(dnode, (uint64_t)seg->lv->vg->extent_size * _seg_len(seg)))
return_0;
} else if (!_add_target_to_dtree(dm, dnode, seg, laopts))
return_0;
return 1;
}
static int _add_new_lv_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
const 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_list *snh;
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);
int save_pending_delete = dm->track_pending_delete;
int merge_in_progress = 0;
if (!(lvlayer = dm_pool_alloc(dm->mem, sizeof(*lvlayer)))) {
log_error("_add_new_lv_to_dtree: pool alloc failed for %s %s.",
display_lvname(lv), layer);
return 0;
}
lvlayer->lv = lv;
lvlayer->visible_component = (laopts->component_lv == lv) ? 1 : 0;
log_debug_activation("Adding new LV %s%s%s to dtree", display_lvname(lv),
layer ? "-" : "", layer ? : "");
/* LV with pending delete is never put new into a table */
if (lv_is_pending_delete(lv) && !_cached_dm_info(dm->mem, dtree, lv, NULL))
return 1; /* Replace with error only when already exists */
if (lv_is_cache_pool(lv) &&
!dm_list_empty(&lv->segs_using_this_lv)) {
/* cache pool is 'meta' LV and does not have a real device node */
if (!_add_new_lv_to_dtree(dm, dtree, seg_lv(first_seg(lv), 0), laopts, NULL))
return_0;
if (!_add_new_lv_to_dtree(dm, dtree, first_seg(lv)->metadata_lv, laopts, NULL))
return_0;
return 1;
}
if (lv_is_cache(lv) && lv_is_cache_single(first_seg(lv)->pool_lv)) {
struct logical_volume *pool_lv = first_seg(lv)->pool_lv;
struct lv_segment *lvseg = first_seg(lv);
struct volume_group *vg = lv->vg;
struct dm_tree_node *dnode_meta;
struct dm_tree_node *dnode_data;
union lvid lvid_meta;
union lvid lvid_data;
char *name_meta;
char *name_data;
char *dlid_meta;
char *dlid_data;
char *dlid_pool;
uint64_t meta_len = first_seg(lv)->metadata_len;
uint64_t data_len = first_seg(lv)->data_len;
uint16_t udev_flags = _get_udev_flags(dm, lv, layer,
laopts->noscan, laopts->temporary,
0);
log_debug("Add cache pool %s to dtree before cache %s", pool_lv->name, lv->name);
if (!_add_new_lv_to_dtree(dm, dtree, pool_lv, laopts, NULL)) {
log_error("Failed to add cachepool to dtree before cache");
return_0;
}
memset(&lvid_meta, 0, sizeof(lvid_meta));
memset(&lvid_data, 0, sizeof(lvid_meta));
memcpy(&lvid_meta.id[0], &vg->id, sizeof(struct id));
memcpy(&lvid_meta.id[1], &lvseg->metadata_id, sizeof(struct id));
memcpy(&lvid_data.id[0], &vg->id, sizeof(struct id));
memcpy(&lvid_data.id[1], &lvseg->data_id, sizeof(struct id));
if (!(dlid_meta = dm_build_dm_uuid(dm->mem, UUID_PREFIX, (const char *)&lvid_meta.s, NULL)))
return_0;
if (!(dlid_data = dm_build_dm_uuid(dm->mem, UUID_PREFIX, (const char *)&lvid_data.s, NULL)))
return_0;
if (!(name_meta = dm_build_dm_name(dm->mem, vg->name, pool_lv->name, "_cmeta")))
return_0;
if (!(name_data = dm_build_dm_name(dm->mem, vg->name, pool_lv->name, "_cdata")))
return_0;
if (!(dlid_pool = build_dm_uuid(dm->mem, pool_lv, NULL)))
return_0;
/* add meta dnode */
if (!(dnode_meta = dm_tree_add_new_dev_with_udev_flags(dtree,
name_meta,
dlid_meta,
-1, -1,
read_only_lv(lv, laopts, layer),
((lv->vg->status & PRECOMMITTED) | laopts->revert) ? 1 : 0,
lvlayer,
udev_flags)))
return_0;
/* add load_segment to meta dnode: linear, size of meta area */
if (!add_linear_area_to_dtree(dnode_meta,
meta_len,
lv->vg->extent_size,
lv->vg->cmd->use_linear_target,
lv->vg->name, lv->name))
return_0;
/* add seg_area to prev load_seg: offset 0 maps to cachepool lv offset 0 */
if (!dm_tree_node_add_target_area(dnode_meta, NULL, dlid_pool, 0))
return_0;
/* add data dnode */
if (!(dnode_data = dm_tree_add_new_dev_with_udev_flags(dtree,
name_data,
dlid_data,
-1, -1,
read_only_lv(lv, laopts, layer),
((lv->vg->status & PRECOMMITTED) | laopts->revert) ? 1 : 0,
lvlayer,
udev_flags)))
return_0;
/* add load_segment to data dnode: linear, size of data area */
if (!add_linear_area_to_dtree(dnode_data,
data_len,
lv->vg->extent_size,
lv->vg->cmd->use_linear_target,
lv->vg->name, lv->name))
return_0;
/* add seg_area to prev load_seg: offset 0 maps to cachepool lv after meta */
if (!dm_tree_node_add_target_area(dnode_data, NULL, dlid_pool, meta_len))
return_0;
}
/* FIXME Seek a simpler way to lay out the snapshot-merge tree. */
if (!layer && lv_is_merging_origin(lv)) {
seg = find_snapshot(lv);
/*
* Prevent merge if merge isn't currently possible:
* either origin or merging snapshot are open
* - for old snaps 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_dm_info(dm->mem, dtree, lv, NULL))) {
/* Merging origin LV is present, check if mergins is already running. */
if ((seg_is_thin_volume(seg) && _thin_lv_has_device_id(dm->mem, lv, NULL, seg->device_id)) ||
(!seg_is_thin_volume(seg) && lv_has_target_type(dm->mem, lv, NULL, TARGET_NAME_SNAPSHOT_MERGE))) {
log_debug_activation("Merging of snapshot volume %s to origin %s is in progress.",
display_lvname(seg->lv), display_lvname(seg->lv));
merge_in_progress = 1; /* Merge is already running */
} /* Merge is not yet running, so check if it can be started */
else if (laopts->resuming) {
log_debug_activation("Postponing pending snapshot merge for origin %s, "
"merge was not started before suspend.",
display_lvname(lv));
laopts->no_merging = 1; /* Cannot be reloaded in suspend */
} /* Non-resuming merge requires origin to be unused */
else if (dinfo->open_count) {
log_debug_activation("Postponing pending snapshot merge for origin %s, "
"origin volume is opened.",
display_lvname(lv));
laopts->no_merging = 1;
}
}
/* If merge would be still undecided, look as snapshot */
if (!merge_in_progress && !laopts->no_merging &&
(dinfo = _cached_dm_info(dm->mem, dtree,
seg_is_thin_volume(seg) ?
seg->lv : seg->cow, NULL))) {
if (seg_is_thin_volume(seg)) {
/* Active thin snapshot prevents merge */
log_debug_activation("Postponing pending snapshot merge for origin volume %s, "
"merging thin snapshot volume %s is active.",
display_lvname(lv), display_lvname(seg->lv));
laopts->no_merging = 1;
} else if (dinfo->open_count) {
log_debug_activation("Postponing pending snapshot merge for origin volume %s, "
"merging snapshot volume %s is opened.",
display_lvname(lv), display_lvname(seg->lv));
laopts->no_merging = 1;
}
}
}
if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, layer)))
return_0;
/* Even unused thin-pool still needs to get layered UUID -suffix */
if (!layer && lv_is_new_thin_pool(lv))
layer = lv_layer(lv);
if (!(dlid = build_dm_uuid(dm->mem, lv, 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;
lvlayer->lv = lv;
lvlayer->visible_component = (laopts->component_lv == lv) ? 1 : 0;
/*
* 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, laopts, layer),
((lv->vg->status & PRECOMMITTED) | laopts->revert) ? 1 : 0,
lvlayer,
_get_udev_flags(dm, lv, layer, laopts->noscan, laopts->temporary,
lvlayer->visible_component))))
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;
if (lv_is_pending_delete(lv))
/* Handle LVs with pending delete */
/* Fow now used only by cache segtype, TODO snapshots */
dm->track_pending_delete = 1;
/* This is unused cache-pool - make metadata accessible */
if (lv_is_cache_pool(lv))
lv = first_seg(lv)->metadata_lv;
/* If this is a snapshot origin, add real LV */
/* If this is a snapshot origin + merging snapshot, add cow + real LV */
/* Snapshot origin could be also external origin */
if (lv_is_origin(lv) && !layer) {
if (!_add_new_lv_to_dtree(dm, dtree, lv, laopts, "real"))
return_0;
if (!laopts->no_merging && lv_is_merging_origin(lv)) {
if (!_add_new_lv_to_dtree(dm, dtree,
find_snapshot(lv)->cow, laopts, "cow"))
return_0;
/*
* Must also add "real" LV for use when
* snapshot-merge target is added
*/
if (!_add_snapshot_merge_target_to_dtree(dm, dnode, lv))
return_0;
} else if (!_add_origin_target_to_dtree(dm, dnode, lv))
return_0;
/* Add any snapshots of this LV */
dm_list_iterate(snh, &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;
} else if (lv_is_cow(lv) && !layer) {
if (!_add_new_lv_to_dtree(dm, dtree, lv, laopts, "cow"))
return_0;
if (!_add_snapshot_target_to_dtree(dm, dnode, lv, laopts))
return_0;
} else if (!layer && ((lv_is_thin_pool(lv) && !lv_is_new_thin_pool(lv)) ||
lv_is_external_origin(lv))) {
/* External origin or 'used' Thin pool is using layer */
if (!_add_new_lv_to_dtree(dm, dtree, lv, laopts, lv_layer(lv)))
return_0;
if (!_add_layer_target_to_dtree(dm, dnode, lv))
return_0;
} else {
/* Add 'real' segments for LVs */
dm_list_iterate_items(seg, &lv->segments) {
if (!_add_segment_to_dtree(dm, dtree, dnode, seg, laopts, layer))
return_0;
if (max_stripe_size < seg->stripe_size * seg->area_count)
max_stripe_size = seg->stripe_size * seg->area_count;
}
}
/* Setup thin pool callback */
if (lv_is_thin_pool(lv) && layer &&
!_pool_register_callback(dm, dnode, lv))
return_0;
if (lv_is_cache(lv) && !lv_is_cache_single(first_seg(lv)->pool_lv) &&
/* Register callback only for layer activation or non-layered cache LV */
(layer || !lv_layer(lv)) &&
/* Register callback when metadata LV is NOT already active */
!_cached_dm_info(dm->mem, dtree, first_seg(first_seg(lv)->pool_lv)->metadata_lv, NULL) &&
!_pool_register_callback(dm, dnode, lv))
return_0;
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;
/* FIXME: layered device read-ahead */
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_is_pvmove(lv))
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;
dm->track_pending_delete = save_pending_delete; /* restore */
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 (!_check_udev_fallback(dm->cmd)) {
fs_set_create();
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_has_mknode(lvlayer->lv) || lvlayer->visible_component) {
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 (!_check_udev_fallback(dm->cmd))
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, const char *non_toplevel_tree_dlid)
{
void *handle = NULL;
struct dm_tree_node *child;
char *vgname, *lvname, *layer;
const char *name, *uuid;
struct dm_str_list *dl;
/* Deactivate any tracked pending delete nodes */
dm_list_iterate_items(dl, &dm->pending_delete) {
log_debug_activation("Deleting tracked UUID %s.", dl->str);
if (!dm_tree_deactivate_children(root, dl->str, strlen(dl->str)))
return_0;
}
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, const struct logical_volume *lv,
struct lv_activate_opts *laopts, action_t action)
{
static const char _action_names[][24] = {
"PRELOAD", "ACTIVATE", "DEACTIVATE", "SUSPEND", "SUSPEND_WITH_LOCKFS", "CLEAN"
};
const size_t DLID_SIZE = ID_LEN + sizeof(UUID_PREFIX) - 1;
struct dm_tree *dtree;
struct dm_tree_node *root;
char *dlid;
int r = 0;
if (action < DM_ARRAY_SIZE(_action_names))
log_debug_activation("Creating %s%s tree for %s.",
_action_names[action],
(laopts->origin_only) ? " origin-only" : "",
display_lvname(lv));
/* Some LV cannot be used for top level tree */
/* TODO: add more.... */
if (lv_is_cache_pool(lv) && !dm_list_empty(&lv->segs_using_this_lv)) {
log_error(INTERNAL_ERROR "Cannot create tree for %s.",
display_lvname(lv));
return 0;
}
/* Some targets may build bigger tree for activation */
dm->activation = ((action == PRELOAD) || (action == ACTIVATE));
dm->suspend = (action == SUSPEND_WITH_LOCKFS) || (action == SUSPEND);
dm->track_external_lv_deps = 1;
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, laopts->origin_only ? lv_layer(lv) : NULL)))
goto_out;
/* Only process nodes with uuid of "LVM-" plus VG id. */
switch(action) {
case CLEAN:
if (retry_deactivation())
dm_tree_retry_remove(root);
/* Deactivate any unused non-toplevel nodes */
if (!_clean_tree(dm, root, laopts->origin_only ? dlid : NULL))
goto_out;
break;
case DEACTIVATE:
if (retry_deactivation())
dm_tree_retry_remove(root);
/* Deactivate LV and all devices it references that nothing else has open. */
if (!dm_tree_deactivate_children(root, dlid, DLID_SIZE))
goto_out;
if (!_remove_lv_symlinks(dm, root))
log_warn("Failed to remove all device symlinks associated with %s.",
display_lvname(lv));
break;
case SUSPEND:
dm_tree_skip_lockfs(root);
if (!dm->flush_required)
dm_tree_use_no_flush_suspend(root);
/* Fall through */
case SUSPEND_WITH_LOCKFS:
if (!dm_tree_suspend_children(root, dlid, DLID_SIZE))
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" :
(lv_is_thin_pool(lv) && laopts->origin_only) ? "tpool" : NULL))
goto_out;
/* Preload any devices required before any suspensions */
if (!dm_tree_preload_children(root, dlid, DLID_SIZE))
goto_out;
if ((dm_tree_node_size_changed(root) < 0))
dm->flush_required = 1;
/* Currently keep the code require flush for any
* non 'thin pool/volume' and size increase */
else if (!lv_is_thin_volume(lv) &&
!lv_is_thin_pool(lv) &&
dm_tree_node_size_changed(root))
dm->flush_required = 1;
if (action == ACTIVATE) {
if (!dm_tree_activate_children(root, dlid, DLID_SIZE))
goto_out;
if (!_create_lv_symlinks(dm, root))
log_warn("Failed to create symlinks for %s.",
display_lvname(lv));
}
break;
default:
log_error(INTERNAL_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, const struct logical_volume *lv,
struct lv_activate_opts *laopts)
{
if (!_tree_action(dm, lv, laopts, ACTIVATE))
return_0;
if (!_tree_action(dm, lv, laopts, CLEAN))
return_0;
return 1;
}
/* origin_only may only be set if we are resuming (not activating) an origin LV */
int dev_manager_preload(struct dev_manager *dm, const struct logical_volume *lv,
struct lv_activate_opts *laopts, int *flush_required)
{
dm->flush_required = *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, const struct logical_volume *lv)
{
struct lv_activate_opts laopts = { 0 };
if (!_tree_action(dm, lv, &laopts, DEACTIVATE))
return_0;
return 1;
}
int dev_manager_suspend(struct dev_manager *dm, const struct logical_volume *lv,
struct lv_activate_opts *laopts, int lockfs, int flush_required)
{
dm->flush_required = flush_required;
if (!_tree_action(dm, lv, laopts, lockfs ? SUSPEND_WITH_LOCKFS : SUSPEND))
return_0;
return 1;
}
/*
* 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("Failed to create partial dtree.");
return r;
}
dm_tree_set_optional_uuid_suffixes(dtree, &uuid_suffix_list[0]);
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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