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63368a5064
lvm2/libdm/libdm-deptree.c
Zdenek Kabelac 63368a5064 libdm: watch for failing _info_by_dev 
Separate handling of error code from _info_by_dev.
This error can only happeng when we are running out of memory.
In such case there is urgent need to stop any futher proceeding
of command and run to error ASAP.
2017-12-04 15:38:50 +01:00

4160 lines
106 KiB
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/*
* Copyright (C) 2005-2017 Red Hat, Inc. All rights reserved.
*
* This file is part of the device-mapper userspace tools.
*
* 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 "dmlib.h"
#include "libdm-targets.h"
#include "libdm-common.h"
#include "kdev_t.h"
#include "dm-ioctl.h"
#include <stdarg.h>
#include <sys/param.h>
#include <sys/utsname.h>
#define MAX_TARGET_PARAMSIZE 500000
#define REPLICATOR_LOCAL_SITE 0
/* Supported segment types */
enum {
SEG_CACHE,
SEG_CRYPT,
SEG_ERROR,
SEG_LINEAR,
SEG_MIRRORED,
SEG_REPLICATOR,
SEG_REPLICATOR_DEV,
SEG_SNAPSHOT,
SEG_SNAPSHOT_ORIGIN,
SEG_SNAPSHOT_MERGE,
SEG_STRIPED,
SEG_ZERO,
SEG_THIN_POOL,
SEG_THIN,
SEG_RAID0,
SEG_RAID0_META,
SEG_RAID1,
SEG_RAID10,
SEG_RAID4,
SEG_RAID5_N,
SEG_RAID5_LA,
SEG_RAID5_RA,
SEG_RAID5_LS,
SEG_RAID5_RS,
SEG_RAID6_N_6,
SEG_RAID6_ZR,
SEG_RAID6_NR,
SEG_RAID6_NC,
SEG_RAID6_LS_6,
SEG_RAID6_RS_6,
SEG_RAID6_LA_6,
SEG_RAID6_RA_6,
};
/* FIXME Add crypt and multipath support */
static const struct {
unsigned type;
const char target[16];
} _dm_segtypes[] = {
{ SEG_CACHE, "cache" },
{ SEG_CRYPT, "crypt" },
{ SEG_ERROR, "error" },
{ SEG_LINEAR, "linear" },
{ SEG_MIRRORED, "mirror" },
{ SEG_REPLICATOR, "replicator" },
{ SEG_REPLICATOR_DEV, "replicator-dev" },
{ SEG_SNAPSHOT, "snapshot" },
{ SEG_SNAPSHOT_ORIGIN, "snapshot-origin" },
{ SEG_SNAPSHOT_MERGE, "snapshot-merge" },
{ SEG_STRIPED, "striped" },
{ SEG_ZERO, "zero"},
{ SEG_THIN_POOL, "thin-pool"},
{ SEG_THIN, "thin"},
{ SEG_RAID0, "raid0"},
{ SEG_RAID0_META, "raid0_meta"},
{ SEG_RAID1, "raid1"},
{ SEG_RAID10, "raid10"},
{ SEG_RAID4, "raid4"},
{ SEG_RAID5_N, "raid5_n"},
{ SEG_RAID5_LA, "raid5_la"},
{ SEG_RAID5_RA, "raid5_ra"},
{ SEG_RAID5_LS, "raid5_ls"},
{ SEG_RAID5_RS, "raid5_rs"},
{ SEG_RAID6_N_6,"raid6_n_6"},
{ SEG_RAID6_ZR, "raid6_zr"},
{ SEG_RAID6_NR, "raid6_nr"},
{ SEG_RAID6_NC, "raid6_nc"},
{ SEG_RAID6_LS_6, "raid6_ls_6"},
{ SEG_RAID6_RS_6, "raid6_rs_6"},
{ SEG_RAID6_LA_6, "raid6_la_6"},
{ SEG_RAID6_RA_6, "raid6_ra_6"},
/*
* WARNING: Since 'raid' target overloads this 1:1 mapping table
* for search do not add new enum elements past them!
*/
{ SEG_RAID5_LS, "raid5"}, /* same as "raid5_ls" (default for MD also) */
{ SEG_RAID6_ZR, "raid6"}, /* same as "raid6_zr" */
{ SEG_RAID10, "raid10_near"}, /* same as "raid10" */
};
/* Some segment types have a list of areas of other devices attached */
struct seg_area {
struct dm_list list;
struct dm_tree_node *dev_node;
uint64_t offset;
unsigned rsite_index; /* Replicator site index */
struct dm_tree_node *slog; /* Replicator sync log node */
uint64_t region_size; /* Replicator sync log size */
uint32_t flags; /* Replicator sync log flags */
};
struct dm_thin_message {
dm_thin_message_t type;
union {
struct {
uint32_t device_id;
uint32_t origin_id;
} m_create_snap;
struct {
uint32_t device_id;
} m_create_thin;
struct {
uint32_t device_id;
} m_delete;
struct {
uint64_t current_id;
uint64_t new_id;
} m_set_transaction_id;
} u;
};
struct thin_message {
struct dm_list list;
struct dm_thin_message message;
int expected_errno;
};
/* Replicator-log has a list of sites */
/* FIXME: maybe move to seg_area too? */
struct replicator_site {
struct dm_list list;
unsigned rsite_index;
dm_replicator_mode_t mode;
uint32_t async_timeout;
uint32_t fall_behind_ios;
uint64_t fall_behind_data;
};
/* Per-segment properties */
struct load_segment {
struct dm_list list;
unsigned type;
uint64_t size;
unsigned area_count; /* Linear + Striped + Mirrored + Crypt + Replicator */
struct dm_list areas; /* Linear + Striped + Mirrored + Crypt + Replicator */
uint32_t stripe_size; /* Striped + raid */
int persistent; /* Snapshot */
uint32_t chunk_size; /* Snapshot */
struct dm_tree_node *cow; /* Snapshot */
struct dm_tree_node *origin; /* Snapshot + Snapshot origin + Cache */
struct dm_tree_node *merge; /* Snapshot */
struct dm_tree_node *log; /* Mirror + Replicator */
uint32_t region_size; /* Mirror + raid */
unsigned clustered; /* Mirror */
unsigned mirror_area_count; /* Mirror */
uint32_t flags; /* Mirror + raid + Cache */
char *uuid; /* Clustered mirror log */
const char *policy_name; /* Cache */
unsigned policy_argc; /* Cache */
struct dm_config_node *policy_settings; /* Cache */
const char *cipher; /* Crypt */
const char *chainmode; /* Crypt */
const char *iv; /* Crypt */
uint64_t iv_offset; /* Crypt */
const char *key; /* Crypt */
const char *rlog_type; /* Replicator */
struct dm_list rsites; /* Replicator */
unsigned rsite_count; /* Replicator */
unsigned rdevice_count; /* Replicator */
struct dm_tree_node *replicator;/* Replicator-dev */
uint64_t rdevice_index; /* Replicator-dev */
int delta_disks; /* raid reshape number of disks */
int data_offset; /* raid reshape data offset on disk to set */
uint64_t rebuilds[RAID_BITMAP_SIZE]; /* raid */
uint64_t writemostly[RAID_BITMAP_SIZE]; /* raid */
uint32_t writebehind; /* raid */
uint32_t max_recovery_rate; /* raid kB/sec/disk */
uint32_t min_recovery_rate; /* raid kB/sec/disk */
uint32_t data_copies; /* raid10 data_copies */
struct dm_tree_node *metadata; /* Thin_pool + Cache */
struct dm_tree_node *pool; /* Thin_pool, Thin */
struct dm_tree_node *external; /* Thin */
struct dm_list thin_messages; /* Thin_pool */
uint64_t transaction_id; /* Thin_pool */
uint64_t low_water_mark; /* Thin_pool */
uint32_t data_block_size; /* Thin_pool + cache */
unsigned skip_block_zeroing; /* Thin_pool */
unsigned ignore_discard; /* Thin_pool target vsn 1.1 */
unsigned no_discard_passdown; /* Thin_pool target vsn 1.1 */
unsigned error_if_no_space; /* Thin pool target vsn 1.10 */
unsigned read_only; /* Thin pool target vsn 1.3 */
uint32_t device_id; /* Thin */
};
/* Per-device properties */
struct load_properties {
int read_only;
uint32_t major;
uint32_t minor;
uint32_t read_ahead;
uint32_t read_ahead_flags;
unsigned segment_count;
int size_changed;
struct dm_list segs;
const char *new_name;
/* If immediate_dev_node is set to 1, try to create the dev node
* as soon as possible (e.g. in preload stage even during traversal
* and processing of dm tree). This will also flush all stacked dev
* node operations, synchronizing with udev.
*/
unsigned immediate_dev_node;
/*
* If the device size changed from zero and this is set,
* don't resume the device immediately, even if the device
* has parents. This works provided the parents do not
* validate the device size and is required by pvmove to
* avoid starting the mirror resync operation too early.
*/
unsigned delay_resume_if_new;
/*
* Call node_send_messages(), set to 2 if there are messages
* When != 0, it validates matching transaction id, thus thin-pools
* where transation_id is passed as 0 are never validated, this
* allows external managment of thin-pool TID.
*/
unsigned send_messages;
/* Skip suspending node's children, used when sending messages to thin-pool */
int skip_suspend;
};
/* Two of these used to join two nodes with uses and used_by. */
struct dm_tree_link {
struct dm_list list;
struct dm_tree_node *node;
};
struct dm_tree_node {
struct dm_tree *dtree;
const char *name;
const char *uuid;
struct dm_info info;
struct dm_list uses; /* Nodes this node uses */
struct dm_list used_by; /* Nodes that use this node */
int activation_priority; /* 0 gets activated first */
int implicit_deps; /* 1 device only implicitly referenced */
uint16_t udev_flags; /* Udev control flags */
void *context; /* External supplied context */
struct load_properties props; /* For creation/table (re)load */
/*
* If presuspend of child node is needed
* Note: only direct child is allowed
*/
struct dm_tree_node *presuspend_node;
/* Callback */
dm_node_callback_fn callback;
void *callback_data;
/*
* TODO:
* Add advanced code which tracks of send ioctls and their
* proper revert operation for more advanced recovery
* Current code serves mostly only to recovery when
* thin pool metadata check fails and command would
* have left active thin data and metadata subvolumes.
*/
struct dm_list activated; /* Head of activated nodes for preload revert */
struct dm_list activated_list; /* List of activated nodes for preload revert */
};
struct dm_tree {
struct dm_pool *mem;
struct dm_hash_table *devs;
struct dm_hash_table *uuids;
struct dm_tree_node root;
int skip_lockfs; /* 1 skips lockfs (for non-snapshots) */
int no_flush; /* 1 sets noflush (mirrors/multipath) */
int retry_remove; /* 1 retries remove if not successful */
uint32_t cookie;
char buf[DM_NAME_LEN + 32]; /* print buffer for device_name (major:minor) */
const char **optional_uuid_suffixes; /* uuid suffixes ignored when matching */
};
/*
* Tree functions.
*/
struct dm_tree *dm_tree_create(void)
{
struct dm_pool *dmem;
struct dm_tree *dtree;
if (!(dmem = dm_pool_create("dtree", 1024)) ||
!(dtree = dm_pool_zalloc(dmem, sizeof(*dtree)))) {
log_error("Failed to allocate dtree.");
if (dmem)
dm_pool_destroy(dmem);
return NULL;
}
dtree->root.dtree = dtree;
dm_list_init(&dtree->root.uses);
dm_list_init(&dtree->root.used_by);
dm_list_init(&dtree->root.activated);
dtree->skip_lockfs = 0;
dtree->no_flush = 0;
dtree->mem = dmem;
dtree->optional_uuid_suffixes = NULL;
if (!(dtree->devs = dm_hash_create(8))) {
log_error("dtree hash creation failed");
dm_pool_destroy(dtree->mem);
return NULL;
}
if (!(dtree->uuids = dm_hash_create(32))) {
log_error("dtree uuid hash creation failed");
dm_hash_destroy(dtree->devs);
dm_pool_destroy(dtree->mem);
return NULL;
}
return dtree;
}
void dm_tree_free(struct dm_tree *dtree)
{
if (!dtree)
return;
dm_hash_destroy(dtree->uuids);
dm_hash_destroy(dtree->devs);
dm_pool_destroy(dtree->mem);
}
void dm_tree_set_cookie(struct dm_tree_node *node, uint32_t cookie)
{
node->dtree->cookie = cookie;
}
uint32_t dm_tree_get_cookie(struct dm_tree_node *node)
{
return node->dtree->cookie;
}
void dm_tree_skip_lockfs(struct dm_tree_node *dnode)
{
dnode->dtree->skip_lockfs = 1;
}
void dm_tree_use_no_flush_suspend(struct dm_tree_node *dnode)
{
dnode->dtree->no_flush = 1;
}
void dm_tree_retry_remove(struct dm_tree_node *dnode)
{
dnode->dtree->retry_remove = 1;
}
/*
* Node functions.
*/
static int _nodes_are_linked(const struct dm_tree_node *parent,
const struct dm_tree_node *child)
{
struct dm_tree_link *dlink;
dm_list_iterate_items(dlink, &parent->uses)
if (dlink->node == child)
return 1;
return 0;
}
static int _link(struct dm_list *list, struct dm_tree_node *node)
{
struct dm_tree_link *dlink;
if (!(dlink = dm_pool_alloc(node->dtree->mem, sizeof(*dlink)))) {
log_error("dtree link allocation failed");
return 0;
}
dlink->node = node;
dm_list_add(list, &dlink->list);
return 1;
}
static int _link_nodes(struct dm_tree_node *parent,
struct dm_tree_node *child)
{
if (_nodes_are_linked(parent, child))
return 1;
if (!_link(&parent->uses, child))
return 0;
if (!_link(&child->used_by, parent))
return 0;
return 1;
}
static void _unlink(struct dm_list *list, struct dm_tree_node *node)
{
struct dm_tree_link *dlink;
dm_list_iterate_items(dlink, list)
if (dlink->node == node) {
dm_list_del(&dlink->list);
break;
}
}
static void _unlink_nodes(struct dm_tree_node *parent,
struct dm_tree_node *child)
{
if (!_nodes_are_linked(parent, child))
return;
_unlink(&parent->uses, child);
_unlink(&child->used_by, parent);
}
static int _add_to_toplevel(struct dm_tree_node *node)
{
return _link_nodes(&node->dtree->root, node);
}
static void _remove_from_toplevel(struct dm_tree_node *node)
{
_unlink_nodes(&node->dtree->root, node);
}
static int _add_to_bottomlevel(struct dm_tree_node *node)
{
return _link_nodes(node, &node->dtree->root);
}
static void _remove_from_bottomlevel(struct dm_tree_node *node)
{
_unlink_nodes(node, &node->dtree->root);
}
static int _link_tree_nodes(struct dm_tree_node *parent, struct dm_tree_node *child)
{
/* Don't link to root node if child already has a parent */
if (parent == &parent->dtree->root) {
if (dm_tree_node_num_children(child, 1))
return 1;
} else
_remove_from_toplevel(child);
if (child == &child->dtree->root) {
if (dm_tree_node_num_children(parent, 0))
return 1;
} else
_remove_from_bottomlevel(parent);
return _link_nodes(parent, child);
}
static struct dm_tree_node *_create_dm_tree_node(struct dm_tree *dtree,
const char *name,
const char *uuid,
struct dm_info *info,
void *context,
uint16_t udev_flags)
{
struct dm_tree_node *node;
dev_t dev;
if (!(node = dm_pool_zalloc(dtree->mem, sizeof(*node))) ||
!(node->name = dm_pool_strdup(dtree->mem, name)) ||
!(node->uuid = dm_pool_strdup(dtree->mem, uuid))) {
log_error("_create_dm_tree_node alloc failed.");
return NULL;
}
node->dtree = dtree;
node->info = *info;
node->context = context;
node->udev_flags = udev_flags;
dm_list_init(&node->uses);
dm_list_init(&node->used_by);
dm_list_init(&node->activated);
dm_list_init(&node->props.segs);
dev = MKDEV((dev_t)info->major, (dev_t)info->minor);
if (!dm_hash_insert_binary(dtree->devs, (const char *) &dev,
sizeof(dev), node)) {
log_error("dtree node hash insertion failed");
dm_pool_free(dtree->mem, node);
return NULL;
}
if (uuid && *uuid &&
!dm_hash_insert(dtree->uuids, uuid, node)) {
log_error("dtree uuid hash insertion failed");
dm_hash_remove_binary(dtree->devs, (const char *) &dev,
sizeof(dev));
dm_pool_free(dtree->mem, node);
return NULL;
}
return node;
}
static struct dm_tree_node *_find_dm_tree_node(struct dm_tree *dtree,
uint32_t major, uint32_t minor)
{
dev_t dev = MKDEV((dev_t)major, (dev_t)minor);
return dm_hash_lookup_binary(dtree->devs, (const char *) &dev,
sizeof(dev));
}
void dm_tree_set_optional_uuid_suffixes(struct dm_tree *dtree, const char **optional_uuid_suffixes)
{
dtree->optional_uuid_suffixes = optional_uuid_suffixes;
}
static struct dm_tree_node *_find_dm_tree_node_by_uuid(struct dm_tree *dtree,
const char *uuid)
{
struct dm_tree_node *node;
const char *default_uuid_prefix;
size_t default_uuid_prefix_len;
const char *suffix, *suffix_position;
char uuid_without_suffix[DM_UUID_LEN];
unsigned i = 0;
const char **suffix_list = dtree->optional_uuid_suffixes;
if ((node = dm_hash_lookup(dtree->uuids, uuid))) {
log_debug("Matched uuid %s in deptree.", uuid);
return node;
}
default_uuid_prefix = dm_uuid_prefix();
default_uuid_prefix_len = strlen(default_uuid_prefix);
if (suffix_list && (suffix_position = rindex(uuid, '-'))) {
while ((suffix = suffix_list[i++])) {
if (strcmp(suffix_position + 1, suffix))
continue;
(void) strncpy(uuid_without_suffix, uuid, sizeof(uuid_without_suffix));
uuid_without_suffix[suffix_position - uuid] = '\0';
if ((node = dm_hash_lookup(dtree->uuids, uuid_without_suffix))) {
log_debug("Matched uuid %s (missing suffix -%s) in deptree.", uuid_without_suffix, suffix);
return node;
}
break;
};
}
if (strncmp(uuid, default_uuid_prefix, default_uuid_prefix_len))
return NULL;
if ((node = dm_hash_lookup(dtree->uuids, uuid + default_uuid_prefix_len))) {
log_debug("Matched uuid %s (missing prefix) in deptree.", uuid + default_uuid_prefix_len);
return node;
}
log_debug("Not matched uuid %s in deptree.", uuid);
return NULL;
}
/* Return node's device_name (major:minor) for debug messages */
static const char *_node_name(struct dm_tree_node *dnode)
{
if (dm_snprintf(dnode->dtree->buf, sizeof(dnode->dtree->buf),
"%s (%" PRIu32 ":%" PRIu32 ")",
dnode->name, dnode->info.major, dnode->info.minor) < 0) {
stack;
return dnode->name;
}
return dnode->dtree->buf;
}
void dm_tree_node_set_udev_flags(struct dm_tree_node *dnode, uint16_t udev_flags)
{
struct dm_info *dinfo = &dnode->info;
if (udev_flags != dnode->udev_flags)
log_debug_activation("Resetting %s (%" PRIu32 ":%" PRIu32
") udev_flags from 0x%x to 0x%x",
dnode->name, dinfo->major, dinfo->minor,
dnode->udev_flags, udev_flags);
dnode->udev_flags = udev_flags;
}
void dm_tree_node_set_read_ahead(struct dm_tree_node *dnode,
uint32_t read_ahead,
uint32_t read_ahead_flags)
{
dnode->props.read_ahead = read_ahead;
dnode->props.read_ahead_flags = read_ahead_flags;
}
void dm_tree_node_set_presuspend_node(struct dm_tree_node *node,
struct dm_tree_node *presuspend_node)
{
node->presuspend_node = presuspend_node;
}
const char *dm_tree_node_get_name(const struct dm_tree_node *node)
{
return node->info.exists ? node->name : "";
}
const char *dm_tree_node_get_uuid(const struct dm_tree_node *node)
{
return node->info.exists ? node->uuid : "";
}
const struct dm_info *dm_tree_node_get_info(const struct dm_tree_node *node)
{
return &node->info;
}
void *dm_tree_node_get_context(const struct dm_tree_node *node)
{
return node->context;
}
int dm_tree_node_size_changed(const struct dm_tree_node *dnode)
{
return dnode->props.size_changed;
}
int dm_tree_node_num_children(const struct dm_tree_node *node, uint32_t inverted)
{
if (inverted) {
if (_nodes_are_linked(&node->dtree->root, node))
return 0;
return dm_list_size(&node->used_by);
}
if (_nodes_are_linked(node, &node->dtree->root))
return 0;
return dm_list_size(&node->uses);
}
/*
* Returns 1 if no prefix supplied
*/
static int _uuid_prefix_matches(const char *uuid, const char *uuid_prefix, size_t uuid_prefix_len)
{
const char *default_uuid_prefix = dm_uuid_prefix();
size_t default_uuid_prefix_len = strlen(default_uuid_prefix);
if (!uuid_prefix)
return 1;
if (!strncmp(uuid, uuid_prefix, uuid_prefix_len))
return 1;
/* Handle transition: active device uuids might be missing the prefix */
if (uuid_prefix_len <= 4)
return 0;
if (!strncmp(uuid, default_uuid_prefix, default_uuid_prefix_len))
return 0;
if (strncmp(uuid_prefix, default_uuid_prefix, default_uuid_prefix_len))
return 0;
if (!strncmp(uuid, uuid_prefix + default_uuid_prefix_len, uuid_prefix_len - default_uuid_prefix_len))
return 1;
return 0;
}
/*
* Returns 1 if no children.
*/
static int _children_suspended(struct dm_tree_node *node,
uint32_t inverted,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
struct dm_list *list;
struct dm_tree_link *dlink;
const struct dm_info *dinfo;
const char *uuid;
if (inverted) {
if (_nodes_are_linked(&node->dtree->root, node))
return 1;
list = &node->used_by;
} else {
if (_nodes_are_linked(node, &node->dtree->root))
return 1;
list = &node->uses;
}
dm_list_iterate_items(dlink, list) {
if (!(uuid = dm_tree_node_get_uuid(dlink->node))) {
stack;
continue;
}
/* Ignore if it doesn't belong to this VG */
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
/* Ignore if parent node wants to presuspend this node */
if (dlink->node->presuspend_node == node)
continue;
if (!(dinfo = dm_tree_node_get_info(dlink->node)))
return_0; /* FIXME Is this normal? */
if (!dinfo->suspended)
return 0;
}
return 1;
}
/*
* Set major and minor to zero for root of tree.
*/
struct dm_tree_node *dm_tree_find_node(struct dm_tree *dtree,
uint32_t major,
uint32_t minor)
{
if (!major && !minor)
return &dtree->root;
return _find_dm_tree_node(dtree, major, minor);
}
/*
* Set uuid to NULL for root of tree.
*/
struct dm_tree_node *dm_tree_find_node_by_uuid(struct dm_tree *dtree,
const char *uuid)
{
if (!uuid || !*uuid)
return &dtree->root;
return _find_dm_tree_node_by_uuid(dtree, uuid);
}
/*
* First time set *handle to NULL.
* Set inverted to invert the tree.
*/
struct dm_tree_node *dm_tree_next_child(void **handle,
const struct dm_tree_node *parent,
uint32_t inverted)
{
struct dm_list **dlink = (struct dm_list **) handle;
const struct dm_list *use_list;
if (inverted)
use_list = &parent->used_by;
else
use_list = &parent->uses;
if (!*dlink)
*dlink = dm_list_first(use_list);
else
*dlink = dm_list_next(use_list, *dlink);
return (*dlink) ? dm_list_item(*dlink, struct dm_tree_link)->node : NULL;
}
static int _deps(struct dm_task **dmt, struct dm_pool *mem, uint32_t major, uint32_t minor,
const char **name, const char **uuid, unsigned inactive_table,
struct dm_info *info, struct dm_deps **deps)
{
memset(info, 0, sizeof(*info));
if (!dm_is_dm_major(major)) {
if (name)
*name = "";
if (uuid)
*uuid = "";
*deps = NULL;
info->major = major;
info->minor = minor;
return 1;
}
if (!(*dmt = dm_task_create(DM_DEVICE_DEPS))) {
log_error("deps dm_task creation failed");
return 0;
}
if (!dm_task_set_major(*dmt, major)) {
log_error("_deps: failed to set major for (%" PRIu32 ":%" PRIu32 ")",
major, minor);
goto failed;
}
if (!dm_task_set_minor(*dmt, minor)) {
log_error("_deps: failed to set minor for (%" PRIu32 ":%" PRIu32 ")",
major, minor);
goto failed;
}
if (inactive_table && !dm_task_query_inactive_table(*dmt)) {
log_error("_deps: failed to set inactive table for (%" PRIu32 ":%" PRIu32 ")",
major, minor);
goto failed;
}
if (!dm_task_run(*dmt)) {
log_error("_deps: task run failed for (%" PRIu32 ":%" PRIu32 ")",
major, minor);
goto failed;
}
if (!dm_task_get_info(*dmt, info)) {
log_error("_deps: failed to get info for (%" PRIu32 ":%" PRIu32 ")",
major, minor);
goto failed;
}
if (!info->exists) {
*name = "";
*uuid = "";
*deps = NULL;
} else {
if (info->major != major) {
log_error("Inconsistent dtree major number: %u != %u",
major, info->major);
goto failed;
}
if (info->minor != minor) {
log_error("Inconsistent dtree minor number: %u != %u",
minor, info->minor);
goto failed;
}
*name = dm_task_get_name(*dmt);
*uuid = dm_task_get_uuid(*dmt);
*deps = dm_task_get_deps(*dmt);
}
return 1;
failed:
dm_task_destroy(*dmt);
return 0;
}
/*
* Deactivate a device with its dependencies if the uuid prefix matches.
*/
static int _info_by_dev(uint32_t major, uint32_t minor, int with_open_count,
struct dm_info *info, struct dm_pool *mem,
const char **name, const char **uuid)
{
struct dm_task *dmt;
int r;
if (!(dmt = dm_task_create(DM_DEVICE_INFO))) {
log_error("_info_by_dev: dm_task creation failed");
return 0;
}
if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) {
log_error("_info_by_dev: Failed to set device number");
dm_task_destroy(dmt);
return 0;
}
if (!with_open_count && !dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if (!(r = dm_task_run(dmt)))
goto_out;
if (!(r = dm_task_get_info(dmt, info)))
goto_out;
if (name && !(*name = dm_pool_strdup(mem, dm_task_get_name(dmt)))) {
log_error("name pool_strdup failed");
r = 0;
goto out;
}
if (uuid && !(*uuid = dm_pool_strdup(mem, dm_task_get_uuid(dmt)))) {
log_error("uuid pool_strdup failed");
r = 0;
goto out;
}
out:
dm_task_destroy(dmt);
return r;
}
static int _check_device_not_in_use(const char *name, struct dm_info *info)
{
if (!info->exists)
return 1;
/* If sysfs is not used, use open_count information only. */
if (!*dm_sysfs_dir()) {
if (info->open_count) {
log_error("Device %s (%" PRIu32 ":%" PRIu32 ") in use",
name, info->major, info->minor);
return 0;
}
return 1;
}
if (dm_device_has_holders(info->major, info->minor)) {
log_error("Device %s (%" PRIu32 ":%" PRIu32 ") is used "
"by another device.", name, info->major, info->minor);
return 0;
}
if (dm_device_has_mounted_fs(info->major, info->minor)) {
log_error("Device %s (%" PRIu32 ":%" PRIu32 ") contains "
"a filesystem in use.", name, info->major, info->minor);
return 0;
}
return 1;
}
/* Check if all parent nodes of given node have open_count == 0 */
static int _node_has_closed_parents(struct dm_tree_node *node,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
struct dm_tree_link *dlink;
const struct dm_info *dinfo;
struct dm_info info;
const char *uuid;
/* Iterate through parents of this node */
dm_list_iterate_items(dlink, &node->used_by) {
if (!(uuid = dm_tree_node_get_uuid(dlink->node))) {
stack;
continue;
}
/* Ignore if it doesn't belong to this VG */
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
if (!(dinfo = dm_tree_node_get_info(dlink->node)))
return_0; /* FIXME Is this normal? */
/* Refresh open_count */
if (!_info_by_dev(dinfo->major, dinfo->minor, 1, &info, NULL, NULL, NULL))
return_0;
if (!info.exists)
continue;
if (info.open_count) {
log_debug_activation("Node %s %d:%d has open_count %d", uuid_prefix,
dinfo->major, dinfo->minor, info.open_count);
return 0;
}
}
return 1;
}
static int _deactivate_node(const char *name, uint32_t major, uint32_t minor,
uint32_t *cookie, uint16_t udev_flags, int retry)
{
struct dm_task *dmt;
int r = 0;
log_verbose("Removing %s (%" PRIu32 ":%" PRIu32 ")", name, major, minor);
if (!(dmt = dm_task_create(DM_DEVICE_REMOVE))) {
log_error("Deactivation dm_task creation failed for %s", name);
return 0;
}
if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) {
log_error("Failed to set device number for %s deactivation", name);
goto out;
}
if (!dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if (cookie)
if (!dm_task_set_cookie(dmt, cookie, udev_flags))
goto out;
if (retry)
dm_task_retry_remove(dmt);
r = dm_task_run(dmt);
/* FIXME Until kernel returns actual name so dm-iface.c can handle it */
rm_dev_node(name, dmt->cookie_set && !(udev_flags & DM_UDEV_DISABLE_DM_RULES_FLAG),
dmt->cookie_set && (udev_flags & DM_UDEV_DISABLE_LIBRARY_FALLBACK));
/* FIXME Remove node from tree or mark invalid? */
out:
dm_task_destroy(dmt);
return r;
}
static int _node_clear_table(struct dm_tree_node *dnode, uint16_t udev_flags)
{
struct dm_task *dmt = NULL, *deps_dmt = NULL;
struct dm_info *info, deps_info;
struct dm_deps *deps = NULL;
const char *name, *uuid, *depname, *depuuid;
const char *default_uuid_prefix;
size_t default_uuid_prefix_len;
uint32_t i;
int r = 0;
if (!(info = &dnode->info)) {
log_error("_node_clear_table failed: missing info");
return 0;
}
if (!(name = dm_tree_node_get_name(dnode))) {
log_error("_node_clear_table failed: missing name");
return 0;
}
/* Is there a table? */
if (!info->exists || !info->inactive_table)
return 1;
/* Get devices used by inactive table that's about to be deleted. */
if (!_deps(&deps_dmt, dnode->dtree->mem, info->major, info->minor, &depname, &depuuid, 1, info, &deps)) {
log_error("Failed to obtain dependencies for %s before clearing table.", name);
return 0;
}
log_verbose("Clearing inactive table %s (%" PRIu32 ":%" PRIu32 ")",
name, info->major, info->minor);
if (!(dmt = dm_task_create(DM_DEVICE_CLEAR))) {
log_error("Table clear dm_task creation failed for %s", name);
goto out;
}
if (!dm_task_set_major(dmt, info->major) ||
!dm_task_set_minor(dmt, info->minor)) {
log_error("Failed to set device number for %s table clear", name);
goto out;
}
r = dm_task_run(dmt);
if (!dm_task_get_info(dmt, info)) {
log_error("_node_clear_table failed: info missing after running task for %s", name);
r = 0;
}
if (!r || !deps)
goto_out;
/*
* Remove (incomplete) devices that the inactive table referred to but
* which are not in the tree, no longer referenced and don't have a live
* table.
*/
default_uuid_prefix = dm_uuid_prefix();
default_uuid_prefix_len = strlen(default_uuid_prefix);
for (i = 0; i < deps->count; i++) {
/* If already in tree, assume it's under control */
if (_find_dm_tree_node(dnode->dtree, MAJOR(deps->device[i]), MINOR(deps->device[i])))
continue;
if (!_info_by_dev(MAJOR(deps->device[i]), MINOR(deps->device[i]), 1,
&deps_info, dnode->dtree->mem, &name, &uuid))
goto_out;
/* Proceed if device is an 'orphan' - unreferenced and without a live table. */
if (!deps_info.exists || deps_info.live_table || deps_info.open_count)
continue;
if (strncmp(uuid, default_uuid_prefix, default_uuid_prefix_len))
continue;
/* Remove device. */
if (!_deactivate_node(name, deps_info.major, deps_info.minor, &dnode->dtree->cookie, udev_flags, 0)) {
log_error("Failed to deactivate no-longer-used device %s (%"
PRIu32 ":%" PRIu32 ")", name, deps_info.major, deps_info.minor);
} else if (deps_info.suspended)
dec_suspended();
}
out:
if (dmt)
dm_task_destroy(dmt);
if (deps_dmt)
dm_task_destroy(deps_dmt);
return r;
}
struct dm_tree_node *dm_tree_add_new_dev_with_udev_flags(struct dm_tree *dtree,
const char *name,
const char *uuid,
uint32_t major,
uint32_t minor,
int read_only,
int clear_inactive,
void *context,
uint16_t udev_flags)
{
struct dm_tree_node *dnode;
struct dm_info info = { 0 };
if (!name || !uuid) {
log_error("Cannot add device without name and uuid.");
return NULL;
}
/* Do we need to add node to tree? */
if (!(dnode = dm_tree_find_node_by_uuid(dtree, uuid))) {
if (!(dnode = _create_dm_tree_node(dtree, name, uuid, &info,
context, 0)))
return_NULL;
/* Attach to root node until a table is supplied */
if (!_add_to_toplevel(dnode) || !_add_to_bottomlevel(dnode))
return_NULL;
dnode->props.major = major;
dnode->props.minor = minor;
} else if (strcmp(name, dnode->name)) {
/* Do we need to rename node? */
if (!(dnode->props.new_name = dm_pool_strdup(dtree->mem, name))) {
log_error("name pool_strdup failed");
return NULL;
}
}
dnode->props.read_only = read_only ? 1 : 0;
dnode->props.read_ahead = DM_READ_AHEAD_AUTO;
dnode->props.read_ahead_flags = 0;
if (clear_inactive && !_node_clear_table(dnode, udev_flags))
return_NULL;
dnode->context = context;
dnode->udev_flags = udev_flags;
return dnode;
}
struct dm_tree_node *dm_tree_add_new_dev(struct dm_tree *dtree, const char *name,
const char *uuid, uint32_t major, uint32_t minor,
int read_only, int clear_inactive, void *context)
{
return dm_tree_add_new_dev_with_udev_flags(dtree, name, uuid, major, minor,
read_only, clear_inactive, context, 0);
}
static struct dm_tree_node *_add_dev(struct dm_tree *dtree,
struct dm_tree_node *parent,
uint32_t major, uint32_t minor,
uint16_t udev_flags,
int implicit_deps)
{
struct dm_task *dmt = NULL;
struct dm_info info;
struct dm_deps *deps = NULL;
const char *name = NULL;
const char *uuid = NULL;
struct dm_tree_node *node = NULL;
uint32_t i;
int new = 0;
/* Already in tree? */
if (!(node = _find_dm_tree_node(dtree, major, minor))) {
if (!_deps(&dmt, dtree->mem, major, minor, &name, &uuid, 0, &info, &deps))
return_NULL;
if (!(node = _create_dm_tree_node(dtree, name, uuid, &info,
NULL, udev_flags)))
goto_out;
new = 1;
node->implicit_deps = implicit_deps;
} else if (!implicit_deps && node->implicit_deps) {
node->udev_flags = udev_flags;
node->implicit_deps = 0;
}
if (!_link_tree_nodes(parent, node)) {
node = NULL;
goto_out;
}
/* If node was already in tree, no need to recurse. */
if (!new)
goto out;
/* Can't recurse if not a mapped device or there are no dependencies */
if (!node->info.exists || !deps || !deps->count) {
if (!_add_to_bottomlevel(node)) {
stack;
node = NULL;
}
goto out;
}
/* Add dependencies to tree */
for (i = 0; i < deps->count; i++)
/* Implicit devices are by default temporary */
if (!_add_dev(dtree, node, MAJOR(deps->device[i]),
MINOR(deps->device[i]), udev_flags |
DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG |
DM_UDEV_DISABLE_DISK_RULES_FLAG |
DM_UDEV_DISABLE_OTHER_RULES_FLAG, 1)) {
node = NULL;
goto_out;
}
out:
if (dmt)
dm_task_destroy(dmt);
return node;
}
int dm_tree_add_dev(struct dm_tree *dtree, uint32_t major, uint32_t minor)
{
return _add_dev(dtree, &dtree->root, major, minor, 0, 0) ? 1 : 0;
}
int dm_tree_add_dev_with_udev_flags(struct dm_tree *dtree, uint32_t major,
uint32_t minor, uint16_t udev_flags)
{
return _add_dev(dtree, &dtree->root, major, minor, udev_flags, 0) ? 1 : 0;
}
static int _rename_node(const char *old_name, const char *new_name, uint32_t major,
uint32_t minor, uint32_t *cookie, uint16_t udev_flags)
{
struct dm_task *dmt;
int r = 0;
log_verbose("Renaming %s (%" PRIu32 ":%" PRIu32 ") to %s", old_name, major, minor, new_name);
if (!(dmt = dm_task_create(DM_DEVICE_RENAME))) {
log_error("Rename dm_task creation failed for %s", old_name);
return 0;
}
if (!dm_task_set_name(dmt, old_name)) {
log_error("Failed to set name for %s rename.", old_name);
goto out;
}
if (!dm_task_set_newname(dmt, new_name))
goto_out;
if (!dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if (!dm_task_set_cookie(dmt, cookie, udev_flags))
goto out;
r = dm_task_run(dmt);
out:
dm_task_destroy(dmt);
return r;
}
/* FIXME Merge with _suspend_node? */
static int _resume_node(const char *name, uint32_t major, uint32_t minor,
uint32_t read_ahead, uint32_t read_ahead_flags,
struct dm_info *newinfo, uint32_t *cookie,
uint16_t udev_flags, int already_suspended)
{
struct dm_task *dmt;
int r = 0;
log_verbose("Resuming %s (%" PRIu32 ":%" PRIu32 ")", name, major, minor);
if (!(dmt = dm_task_create(DM_DEVICE_RESUME))) {
log_debug_activation("Suspend dm_task creation failed for %s.", name);
return 0;
}
/* FIXME Kernel should fill in name on return instead */
if (!dm_task_set_name(dmt, name)) {
log_debug_activation("Failed to set device name for %s resumption.", name);
goto out;
}
if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) {
log_error("Failed to set device number for %s resumption.", name);
goto out;
}
if (!dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if (!dm_task_set_read_ahead(dmt, read_ahead, read_ahead_flags))
log_warn("WARNING: Failed to set read ahead.");
if (!dm_task_set_cookie(dmt, cookie, udev_flags))
goto_out;
if (!(r = dm_task_run(dmt)))
goto_out;
if (already_suspended)
dec_suspended();
if (!(r = dm_task_get_info(dmt, newinfo)))
stack;
out:
dm_task_destroy(dmt);
return r;
}
static int _suspend_node(const char *name, uint32_t major, uint32_t minor,
int skip_lockfs, int no_flush, struct dm_info *newinfo)
{
struct dm_task *dmt;
int r;
log_verbose("Suspending %s (%" PRIu32 ":%" PRIu32 ")%s%s",
name, major, minor,
skip_lockfs ? "" : " with filesystem sync",
no_flush ? "" : " with device flush");
if (!(dmt = dm_task_create(DM_DEVICE_SUSPEND))) {
log_error("Suspend dm_task creation failed for %s", name);
return 0;
}
if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) {
log_error("Failed to set device number for %s suspension.", name);
dm_task_destroy(dmt);
return 0;
}
if (!dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if (skip_lockfs && !dm_task_skip_lockfs(dmt))
log_warn("WARNING: Failed to set skip_lockfs flag.");
if (no_flush && !dm_task_no_flush(dmt))
log_warn("WARNING: Failed to set no_flush flag.");
if ((r = dm_task_run(dmt))) {
inc_suspended();
r = dm_task_get_info(dmt, newinfo);
}
dm_task_destroy(dmt);
return r;
}
static int _thin_pool_get_status(struct dm_tree_node *dnode,
struct dm_status_thin_pool *s)
{
struct dm_task *dmt;
int r = 0;
uint64_t start, length;
char *type = NULL;
char *params = NULL;
if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
return_0;
if (!dm_task_set_major(dmt, dnode->info.major) ||
!dm_task_set_minor(dmt, dnode->info.minor)) {
log_error("Failed to set major minor.");
goto out;
}
if (!dm_task_no_flush(dmt))
log_warn("WARNING: Can't set no_flush flag."); /* Non fatal */
if (!dm_task_run(dmt))
goto_out;
dm_get_next_target(dmt, NULL, &start, &length, &type, &params);
if (type && (strcmp(type, "thin-pool") != 0)) {
log_error("Expected thin-pool target for %d:%d and got %s.",
dnode->info.major, dnode->info.minor, type);
goto out;
}
if (!parse_thin_pool_status(params, s))
goto_out;
log_debug_activation("Found transaction id %" PRIu64 " for thin pool %s "
"with status line: %s.",
s->transaction_id, _node_name(dnode), params);
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
static int _thin_pool_node_message(struct dm_tree_node *dnode, struct thin_message *tm)
{
struct dm_task *dmt;
struct dm_thin_message *m = &tm->message;
char buf[64];
int r;
switch (m->type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
r = dm_snprintf(buf, sizeof(buf), "create_snap %u %u",
m->u.m_create_snap.device_id,
m->u.m_create_snap.origin_id);
break;
case DM_THIN_MESSAGE_CREATE_THIN:
r = dm_snprintf(buf, sizeof(buf), "create_thin %u",
m->u.m_create_thin.device_id);
break;
case DM_THIN_MESSAGE_DELETE:
r = dm_snprintf(buf, sizeof(buf), "delete %u",
m->u.m_delete.device_id);
break;
case DM_THIN_MESSAGE_SET_TRANSACTION_ID:
r = dm_snprintf(buf, sizeof(buf),
"set_transaction_id %" PRIu64 " %" PRIu64,
m->u.m_set_transaction_id.current_id,
m->u.m_set_transaction_id.new_id);
break;
case DM_THIN_MESSAGE_RESERVE_METADATA_SNAP: /* target vsn 1.1 */
r = dm_snprintf(buf, sizeof(buf), "reserve_metadata_snap");
break;
case DM_THIN_MESSAGE_RELEASE_METADATA_SNAP: /* target vsn 1.1 */
r = dm_snprintf(buf, sizeof(buf), "release_metadata_snap");
break;
default:
r = -1;
}
if (r < 0) {
log_error("Failed to prepare message.");
return 0;
}
r = 0;
if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
return_0;
if (!dm_task_set_major(dmt, dnode->info.major) ||
!dm_task_set_minor(dmt, dnode->info.minor)) {
log_error("Failed to set message major minor.");
goto out;
}
if (!dm_task_set_message(dmt, buf))
goto_out;
/* Internal functionality of dm_task */
dmt->expected_errno = tm->expected_errno;
if (!dm_task_run(dmt)) {
log_error("Failed to process thin pool message \"%s\".", buf);
goto out;
}
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/* For preload pass only validate pool's transaction_id */
static int _node_send_messages(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len,
int send)
{
struct load_segment *seg;
struct thin_message *tmsg;
struct dm_status_thin_pool stp = { 0 };
const char *uuid;
int have_messages;
if (!dnode->info.exists || (dm_list_size(&dnode->props.segs) != 1))
return 1;
seg = dm_list_item(dm_list_last(&dnode->props.segs), struct load_segment);
if (seg->type != SEG_THIN_POOL)
return 1;
if (!(uuid = dm_tree_node_get_uuid(dnode)))
return_0;
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len)) {
log_debug_activation("UUID \"%s\" does not match.", uuid);
return 1;
}
if (!_thin_pool_get_status(dnode, &stp))
return_0;
have_messages = !dm_list_empty(&seg->thin_messages) ? 1 : 0;
if (stp.transaction_id == seg->transaction_id) {
dnode->props.send_messages = 0; /* messages already committed */
if (have_messages)
log_debug_activation("Thin pool %s transaction_id matches %"
PRIu64 ", skipping messages.",
_node_name(dnode), stp.transaction_id);
return 1;
}
/* Error if there are no stacked messages or id mismatches */
if ((stp.transaction_id + 1) != seg->transaction_id) {
log_error("Thin pool %s transaction_id is %" PRIu64 ", while expected %" PRIu64 ".",
_node_name(dnode), stp.transaction_id, seg->transaction_id - have_messages);
return 0;
}
if (!have_messages || !send)
return 1; /* transaction_id is matching */
dm_list_iterate_items(tmsg, &seg->thin_messages) {
if (!(_thin_pool_node_message(dnode, tmsg)))
return_0;
if (tmsg->message.type == DM_THIN_MESSAGE_SET_TRANSACTION_ID) {
if (!_thin_pool_get_status(dnode, &stp))
return_0;
if (stp.transaction_id != tmsg->message.u.m_set_transaction_id.new_id) {
log_error("Thin pool %s transaction_id is %" PRIu64
" and does not match expected %" PRIu64 ".",
_node_name(dnode), stp.transaction_id,
tmsg->message.u.m_set_transaction_id.new_id);
return 0;
}
}
}
dnode->props.send_messages = 0; /* messages posted */
return 1;
}
/*
* FIXME Don't attempt to deactivate known internal dependencies.
*/
static int _dm_tree_deactivate_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len,
unsigned level)
{
int r = 1;
void *handle = NULL;
struct dm_tree_node *child = dnode;
struct dm_info info;
const struct dm_info *dinfo;
const char *name;
const char *uuid;
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
if (!(dinfo = dm_tree_node_get_info(child))) {
stack;
continue;
}
if (!(name = dm_tree_node_get_name(child))) {
stack;
continue;
}
if (!(uuid = dm_tree_node_get_uuid(child))) {
stack;
continue;
}
/* Ignore if it doesn't belong to this VG */
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
/* Refresh open_count */
if (!_info_by_dev(dinfo->major, dinfo->minor, 1, &info, NULL, NULL, NULL))
return_0;
if (!info.exists)
continue;
if (info.open_count) {
/* Skip internal non-toplevel opened nodes */
if (level)
continue;
/* When retry is not allowed, error */
if (!child->dtree->retry_remove) {
log_error("Unable to deactivate open %s (%" PRIu32
":%" PRIu32 ")", name, info.major, info.minor);
r = 0;
continue;
}
/* Check toplevel node for holders/mounted fs */
if (!_check_device_not_in_use(name, &info)) {
stack;
r = 0;
continue;
}
/* Go on with retry */
}
/* Also checking open_count in parent nodes of presuspend_node */
if ((child->presuspend_node &&
!_node_has_closed_parents(child->presuspend_node,
uuid_prefix, uuid_prefix_len))) {
/* Only report error from (likely non-internal) dependency at top level */
if (!level) {
log_error("Unable to deactivate open %s (%" PRIu32
":%" PRIu32 ")", name, info.major,
info.minor);
r = 0;
}
continue;
}
/* Suspend child node first if requested */
if (child->presuspend_node &&
!dm_tree_suspend_children(child, uuid_prefix, uuid_prefix_len))
continue;
if (!_deactivate_node(name, info.major, info.minor,
&child->dtree->cookie, child->udev_flags,
(level == 0) ? child->dtree->retry_remove : 0)) {
log_error("Unable to deactivate %s (%" PRIu32
":%" PRIu32 ")", name, info.major,
info.minor);
r = 0;
continue;
}
if (info.suspended && info.live_table)
dec_suspended();
if (child->callback &&
!child->callback(child, DM_NODE_CALLBACK_DEACTIVATED,
child->callback_data))
stack;
/* FIXME Deactivation must currently ignore failure
* here so that lvremove can continue: we need an
* alternative way to handle this state without
* setting r=0. Or better, skip calling thin_check
* entirely if the device is about to be removed. */
if (dm_tree_node_num_children(child, 0) &&
!_dm_tree_deactivate_children(child, uuid_prefix, uuid_prefix_len, level + 1))
return_0;
}
return r;
}
int dm_tree_deactivate_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
return _dm_tree_deactivate_children(dnode, uuid_prefix, uuid_prefix_len, 0);
}
int dm_tree_suspend_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
int r = 1;
void *handle = NULL;
struct dm_tree_node *child = dnode;
struct dm_info info, newinfo;
const struct dm_info *dinfo;
const char *name;
const char *uuid;
/* Suspend nodes at this level of the tree */
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
if (!(dinfo = dm_tree_node_get_info(child))) {
stack;
continue;
}
if (!(name = dm_tree_node_get_name(child))) {
stack;
continue;
}
if (!(uuid = dm_tree_node_get_uuid(child))) {
stack;
continue;
}
/* Ignore if it doesn't belong to this VG */
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
/* Ensure immediate parents are already suspended */
if (!_children_suspended(child, 1, uuid_prefix, uuid_prefix_len))
continue;
if (!_info_by_dev(dinfo->major, dinfo->minor, 0, &info, NULL, NULL, NULL))
return_0;
if (!info.exists || info.suspended)
continue;
/* If child has some real messages send them */
if ((child->props.send_messages > 1) && r) {
if (!(r = _node_send_messages(child, uuid_prefix, uuid_prefix_len, 1)))
stack;
else {
log_debug_activation("Sent messages to thin-pool %s and "
"skipping suspend of its children.",
_node_name(child));
child->props.skip_suspend++;
}
continue;
}
if (!_suspend_node(name, info.major, info.minor,
child->dtree->skip_lockfs,
child->dtree->no_flush, &newinfo)) {
log_error("Unable to suspend %s (%" PRIu32
":%" PRIu32 ")", name, info.major,
info.minor);
r = 0;
continue;
}
/* Update cached info */
child->info = newinfo;
}
/* Then suspend any child nodes */
handle = NULL;
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
if (child->props.skip_suspend)
continue;
if (!(uuid = dm_tree_node_get_uuid(child))) {
stack;
continue;
}
/* Ignore if it doesn't belong to this VG */
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
if (dm_tree_node_num_children(child, 0))
if (!dm_tree_suspend_children(child, uuid_prefix, uuid_prefix_len))
return_0;
}
return r;
}
/*
* _rename_conflict_exists
* @dnode
* @node
* @resolvable
*
* Check if there is a rename conflict with existing peers in
* this tree. 'resolvable' is set if the conflicting node will
* also be undergoing a rename. (Allowing that node to rename
* first would clear the conflict.)
*
* Returns: 1 if conflict, 0 otherwise
*/
static int _rename_conflict_exists(struct dm_tree_node *parent,
struct dm_tree_node *node,
int *resolvable)
{
void *handle = NULL;
const char *name = dm_tree_node_get_name(node);
const char *sibling_name;
struct dm_tree_node *sibling;
*resolvable = 0;
if (!name)
return_0;
while ((sibling = dm_tree_next_child(&handle, parent, 0))) {
if (sibling == node)
continue;
if (!(sibling_name = dm_tree_node_get_name(sibling))) {
stack;
continue;
}
if (!strcmp(node->props.new_name, sibling_name)) {
if (sibling->props.new_name)
*resolvable = 1;
return 1;
}
}
return 0;
}
int dm_tree_activate_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
int r = 1;
int resolvable_name_conflict, awaiting_peer_rename = 0;
void *handle = NULL;
struct dm_tree_node *child = dnode;
struct dm_info newinfo;
const char *name;
const char *uuid;
int priority;
/* Activate children first */
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
if (!(uuid = dm_tree_node_get_uuid(child))) {
stack;
continue;
}
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
if (dm_tree_node_num_children(child, 0))
if (!dm_tree_activate_children(child, uuid_prefix, uuid_prefix_len))
return_0;
}
handle = NULL;
for (priority = 0; priority < 3; priority++) {
awaiting_peer_rename = 0;
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
if (priority != child->activation_priority)
continue;
if (!(uuid = dm_tree_node_get_uuid(child))) {
stack;
continue;
}
if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
continue;
if (!(name = dm_tree_node_get_name(child))) {
stack;
continue;
}
/* Rename? */
if (child->props.new_name) {
if (_rename_conflict_exists(dnode, child, &resolvable_name_conflict) &&
resolvable_name_conflict) {
awaiting_peer_rename++;
continue;
}
if (!_rename_node(name, child->props.new_name, child->info.major,
child->info.minor, &child->dtree->cookie,
child->udev_flags)) {
log_error("Failed to rename %s (%" PRIu32
":%" PRIu32 ") to %s", name, child->info.major,
child->info.minor, child->props.new_name);
return 0;
}
child->name = child->props.new_name;
child->props.new_name = NULL;
}
if (!child->info.inactive_table && !child->info.suspended)
continue;
if (!_resume_node(child->name, child->info.major, child->info.minor,
child->props.read_ahead, child->props.read_ahead_flags,
&newinfo, &child->dtree->cookie, child->udev_flags, child->info.suspended)) {
log_error("Unable to resume %s (%" PRIu32
":%" PRIu32 ")", child->name, child->info.major,
child->info.minor);
r = 0;
continue;
}
/* Update cached info */
child->info = newinfo;
}
if (awaiting_peer_rename)
priority--; /* redo priority level */
}
/*
* FIXME: Implement delayed error reporting
* activation should be stopped only in the case,
* the submission of transation_id message fails,
* resume should continue further, just whole command
* has to report failure.
*/
if (r && dnode->props.send_messages &&
!(r = _node_send_messages(dnode, uuid_prefix, uuid_prefix_len, 1)))
stack;
return r;
}
static int _create_node(struct dm_tree_node *dnode)
{
int r = 0;
struct dm_task *dmt;
log_verbose("Creating %s", dnode->name);
if (!(dmt = dm_task_create(DM_DEVICE_CREATE))) {
log_error("Create dm_task creation failed for %s", dnode->name);
return 0;
}
if (!dm_task_set_name(dmt, dnode->name)) {
log_error("Failed to set device name for %s", dnode->name);
goto out;
}
if (!dm_task_set_uuid(dmt, dnode->uuid)) {
log_error("Failed to set uuid for %s", dnode->name);
goto out;
}
if (dnode->props.major &&
(!dm_task_set_major(dmt, dnode->props.major) ||
!dm_task_set_minor(dmt, dnode->props.minor))) {
log_error("Failed to set device number for %s creation.", dnode->name);
goto out;
}
if (dnode->props.read_only && !dm_task_set_ro(dmt)) {
log_error("Failed to set read only flag for %s", dnode->name);
goto out;
}
if (!dm_task_no_open_count(dmt))
log_warn("WARNING: Failed to disable open_count.");
if ((r = dm_task_run(dmt))) {
if (!(r = dm_task_get_info(dmt, &dnode->info)))
/*
* This should not be possible to occur. However,
* we print an error message anyway for the more
* absurd cases (e.g. memory corruption) so there
* is never any question as to which one failed.
*/
log_error(INTERNAL_ERROR
"Unable to get DM task info for %s.",
dnode->name);
}
out:
dm_task_destroy(dmt);
return r;
}
/*
* _remove_node
*
* This function is only used to remove a DM device that has failed
* to load any table.
*/
static int _remove_node(struct dm_tree_node *dnode)
{
if (!dnode->info.exists)
return 1;
if (dnode->info.live_table || dnode->info.inactive_table) {
log_error(INTERNAL_ERROR
"_remove_node called on device with loaded table(s).");
return 0;
}
if (!_deactivate_node(dnode->name, dnode->info.major, dnode->info.minor,
&dnode->dtree->cookie, dnode->udev_flags, 0)) {
log_error("Failed to clean-up device with no table: %s %u:%u",
dnode->name ? dnode->name : "",
dnode->info.major, dnode->info.minor);
return 0;
}
return 1;
}
static int _build_dev_string(char *devbuf, size_t bufsize, struct dm_tree_node *node)
{
if (!dm_format_dev(devbuf, bufsize, node->info.major, node->info.minor)) {
log_error("Failed to format %s device number for %s as dm "
"target (%u,%u)",
node->name, node->uuid, node->info.major, node->info.minor);
return 0;
}
return 1;
}
/* simplify string emiting code */
#define EMIT_PARAMS(p, str...)\
do {\
int w;\
if ((w = dm_snprintf(params + p, paramsize - (size_t) p, str)) < 0) {\
stack; /* Out of space */\
return -1;\
}\
p += w;\
} while (0)
/*
* _emit_areas_line
*
* Returns: 1 on success, 0 on failure
*/
static int _emit_areas_line(struct dm_task *dmt __attribute__((unused)),
struct load_segment *seg, char *params,
size_t paramsize, int *pos)
{
struct seg_area *area;
char devbuf[DM_FORMAT_DEV_BUFSIZE];
unsigned first_time = 1;
const char *logtype, *synctype;
unsigned log_parm_count;
dm_list_iterate_items(area, &seg->areas) {
switch (seg->type) {
case SEG_REPLICATOR_DEV:
if (!_build_dev_string(devbuf, sizeof(devbuf), area->dev_node))
return_0;
EMIT_PARAMS(*pos, " %d 1 %s", area->rsite_index, devbuf);
if (first_time)
EMIT_PARAMS(*pos, " nolog 0");
else {
/* Remote devices */
log_parm_count = (area->flags &
(DM_NOSYNC | DM_FORCESYNC)) ? 2 : 1;
if (!area->slog) {
devbuf[0] = 0; /* Only core log parameters */
logtype = "core";
} else {
devbuf[0] = ' '; /* Extra space before device name */
if (!_build_dev_string(devbuf + 1,
sizeof(devbuf) - 1,
area->slog))
return_0;
logtype = "disk";
log_parm_count++; /* Extra sync log device name parameter */
}
EMIT_PARAMS(*pos, " %s %u%s %" PRIu64, logtype,
log_parm_count, devbuf, area->region_size);
synctype = (area->flags & DM_NOSYNC) ?
" nosync" : (area->flags & DM_FORCESYNC) ?
" sync" : NULL;
if (synctype)
EMIT_PARAMS(*pos, "%s", synctype);
}
break;
case SEG_RAID0:
case SEG_RAID0_META:
case SEG_RAID1:
case SEG_RAID10:
case SEG_RAID4:
case SEG_RAID5_N:
case SEG_RAID5_LA:
case SEG_RAID5_RA:
case SEG_RAID5_LS:
case SEG_RAID5_RS:
case SEG_RAID6_N_6:
case SEG_RAID6_ZR:
case SEG_RAID6_NR:
case SEG_RAID6_NC:
case SEG_RAID6_LS_6:
case SEG_RAID6_RS_6:
case SEG_RAID6_LA_6:
case SEG_RAID6_RA_6:
if (!area->dev_node) {
EMIT_PARAMS(*pos, " -");
break;
}
if (!_build_dev_string(devbuf, sizeof(devbuf), area->dev_node))
return_0;
EMIT_PARAMS(*pos, " %s", devbuf);
break;
default:
if (!_build_dev_string(devbuf, sizeof(devbuf), area->dev_node))
return_0;
EMIT_PARAMS(*pos, "%s%s %" PRIu64, first_time ? "" : " ",
devbuf, area->offset);
}
first_time = 0;
}
return 1;
}
static int _replicator_emit_segment_line(const struct load_segment *seg, char *params,
size_t paramsize, int *pos)
{
const struct load_segment *rlog_seg;
struct replicator_site *rsite;
char rlogbuf[DM_FORMAT_DEV_BUFSIZE];
unsigned parm_count;
if (!seg->log || !_build_dev_string(rlogbuf, sizeof(rlogbuf), seg->log))
return_0;
rlog_seg = dm_list_item(dm_list_last(&seg->log->props.segs),
struct load_segment);
EMIT_PARAMS(*pos, "%s 4 %s 0 auto %" PRIu64,
seg->rlog_type, rlogbuf, rlog_seg->size);
dm_list_iterate_items(rsite, &seg->rsites) {
parm_count = (rsite->fall_behind_data
|| rsite->fall_behind_ios
|| rsite->async_timeout) ? 4 : 2;
EMIT_PARAMS(*pos, " blockdev %u %u %s", parm_count, rsite->rsite_index,
(rsite->mode == DM_REPLICATOR_SYNC) ? "synchronous" : "asynchronous");
if (rsite->fall_behind_data)
EMIT_PARAMS(*pos, " data %" PRIu64, rsite->fall_behind_data);
else if (rsite->fall_behind_ios)
EMIT_PARAMS(*pos, " ios %" PRIu32, rsite->fall_behind_ios);
else if (rsite->async_timeout)
EMIT_PARAMS(*pos, " timeout %" PRIu32, rsite->async_timeout);
}
return 1;
}
/*
* Returns: 1 on success, 0 on failure
*/
static int _mirror_emit_segment_line(struct dm_task *dmt, struct load_segment *seg,
char *params, size_t paramsize)
{
int block_on_error = 0;
int handle_errors = 0;
int dm_log_userspace = 0;
struct utsname uts;
unsigned log_parm_count;
int pos = 0, parts;
char logbuf[DM_FORMAT_DEV_BUFSIZE];
const char *logtype;
unsigned kmaj = 0, kmin = 0, krel = 0;
if (uname(&uts) == -1) {
log_error("Cannot read kernel release version.");
return 0;
}
/* Kernels with a major number of 2 always had 3 parts. */
parts = sscanf(uts.release, "%u.%u.%u", &kmaj, &kmin, &krel);
if (parts < 1 || (kmaj < 3 && parts < 3)) {
log_error("Wrong kernel release version %s.", uts.release);
return 0;
}
if ((seg->flags & DM_BLOCK_ON_ERROR)) {
/*
* Originally, block_on_error was an argument to the log
* portion of the mirror CTR table. It was renamed to
* "handle_errors" and now resides in the 'features'
* section of the mirror CTR table (i.e. at the end).
*
* We can identify whether to use "block_on_error" or
* "handle_errors" by the dm-mirror module's version
* number (>= 1.12) or by the kernel version (>= 2.6.22).
*/
if (KERNEL_VERSION(kmaj, kmin, krel) >= KERNEL_VERSION(2, 6, 22))
handle_errors = 1;
else
block_on_error = 1;
}
if (seg->clustered) {
/* Cluster mirrors require a UUID */
if (!seg->uuid)
return_0;
/*
* Cluster mirrors used to have their own log
* types. Now they are accessed through the
* userspace log type.
*
* The dm-log-userspace module was added to the
* 2.6.31 kernel.
*/
if (KERNEL_VERSION(kmaj, kmin, krel) >= KERNEL_VERSION(2, 6, 31))
dm_log_userspace = 1;
}
/* Region size */
log_parm_count = 1;
/* [no]sync, block_on_error etc. */
log_parm_count += hweight32(seg->flags);
/* "handle_errors" is a feature arg now */
if (handle_errors)
log_parm_count--;
/* DM_CORELOG does not count in the param list */
if (seg->flags & DM_CORELOG)
log_parm_count--;
if (seg->clustered) {
log_parm_count++; /* For UUID */
if (!dm_log_userspace)
EMIT_PARAMS(pos, "clustered-");
else
/* For clustered-* type field inserted later */
log_parm_count++;
}
if (!seg->log)
logtype = "core";
else {
logtype = "disk";
log_parm_count++;
if (!_build_dev_string(logbuf, sizeof(logbuf), seg->log))
return_0;
}
if (dm_log_userspace)
EMIT_PARAMS(pos, "userspace %u %s clustered-%s",
log_parm_count, seg->uuid, logtype);
else
EMIT_PARAMS(pos, "%s %u", logtype, log_parm_count);
if (seg->log)
EMIT_PARAMS(pos, " %s", logbuf);
EMIT_PARAMS(pos, " %u", seg->region_size);
if (seg->clustered && !dm_log_userspace)
EMIT_PARAMS(pos, " %s", seg->uuid);
if ((seg->flags & DM_NOSYNC))
EMIT_PARAMS(pos, " nosync");
else if ((seg->flags & DM_FORCESYNC))
EMIT_PARAMS(pos, " sync");
if (block_on_error)
EMIT_PARAMS(pos, " block_on_error");
EMIT_PARAMS(pos, " %u ", seg->mirror_area_count);
if (_emit_areas_line(dmt, seg, params, paramsize, &pos) <= 0)
return_0;
if (handle_errors)
EMIT_PARAMS(pos, " 1 handle_errors");
return 1;
}
static int _2_if_value(unsigned p)
{
return p ? 2 : 0;
}
/* Return number of bits passed in @bits assuming 2 * 64 bit size */
static int _get_params_count(const uint64_t *bits)
{
int r = 0;
int i = RAID_BITMAP_SIZE;
while (i--) {
r += 2 * hweight32(bits[i] & 0xFFFFFFFF);
r += 2 * hweight32(bits[i] >> 32);
}
return r;
}
/*
* Get target version (major, minor and patchlevel) for @target_name
*
* FIXME: this function is derived from liblvm.
* Integrate with move of liblvm functions
* to libdm in future library layer purge
* (e.g. expose as API dm_target_version()?)
*/
static int _target_version(const char *target_name, uint32_t *maj,
uint32_t *min, uint32_t *patchlevel)
{
int r = 0;
struct dm_task *dmt;
struct dm_versions *target, *last_target = NULL;
log_very_verbose("Getting target version for %s", target_name);
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
return_0;
if (!dm_task_run(dmt)) {
log_debug_activation("Failed to get %s target versions", target_name);
/* Assume this was because LIST_VERSIONS isn't supported */
*maj = *min = *patchlevel = 0;
r = 1;
} else
for (target = dm_task_get_versions(dmt);
target != last_target;
last_target = target, target = (struct dm_versions *)((char *) target + target->next))
if (!strcmp(target_name, target->name)) {
*maj = target->version[0];
*min = target->version[1];
*patchlevel = target->version[2];
log_very_verbose("Found %s target "
"v%" PRIu32 ".%" PRIu32 ".%" PRIu32 ".",
target_name, *maj, *min, *patchlevel);
r = 1;
break;
}
dm_task_destroy(dmt);
return r;
}
static int _raid_emit_segment_line(struct dm_task *dmt, uint32_t major,
uint32_t minor, struct load_segment *seg,
uint64_t *seg_start, char *params,
size_t paramsize)
{
uint32_t i;
uint32_t area_count = seg->area_count / 2;
uint32_t maj, min, patchlevel;
int param_count = 1; /* mandatory 'chunk size'/'stripe size' arg */
int pos = 0;
unsigned type;
if (seg->area_count % 2)
return 0;
if ((seg->flags & DM_NOSYNC) || (seg->flags & DM_FORCESYNC))
param_count++;
param_count += _2_if_value(seg->data_offset) +
_2_if_value(seg->delta_disks) +
_2_if_value(seg->region_size) +
_2_if_value(seg->writebehind) +
_2_if_value(seg->min_recovery_rate) +
_2_if_value(seg->max_recovery_rate) +
_2_if_value(seg->data_copies > 1);
/* rebuilds and writemostly are BITMAP_SIZE * 64 bits */
param_count += _get_params_count(seg->rebuilds);
param_count += _get_params_count(seg->writemostly);
if ((seg->type == SEG_RAID1) && seg->stripe_size)
log_info("WARNING: Ignoring RAID1 stripe size");
/* Kernel only expects "raid0", not "raid0_meta" */
type = seg->type;
if (type == SEG_RAID0_META)
type = SEG_RAID0;
EMIT_PARAMS(pos, "%s %d %u",
type == SEG_RAID10 ? "raid10" : _dm_segtypes[type].target,
param_count, seg->stripe_size);
if (!_target_version("raid", &maj, &min, &patchlevel))
return_0;
/*
* Target version prior to 1.9.0 and >= 1.11.0 emit
* order of parameters as of kernel target documentation
*/
if (maj > 1 || (maj == 1 && (min < 9 || min >= 11))) {
if (seg->flags & DM_NOSYNC)
EMIT_PARAMS(pos, " nosync");
else if (seg->flags & DM_FORCESYNC)
EMIT_PARAMS(pos, " sync");
for (i = 0; i < area_count; i++)
if (seg->rebuilds[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " rebuild %u", i);
if (seg->min_recovery_rate)
EMIT_PARAMS(pos, " min_recovery_rate %u",
seg->min_recovery_rate);
if (seg->max_recovery_rate)
EMIT_PARAMS(pos, " max_recovery_rate %u",
seg->max_recovery_rate);
for (i = 0; i < area_count; i++)
if (seg->writemostly[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " write_mostly %u", i);
if (seg->writebehind)
EMIT_PARAMS(pos, " max_write_behind %u", seg->writebehind);
if (seg->region_size)
EMIT_PARAMS(pos, " region_size %u", seg->region_size);
if (seg->data_copies > 1 && type == SEG_RAID10)
EMIT_PARAMS(pos, " raid10_copies %u", seg->data_copies);
if (seg->delta_disks)
EMIT_PARAMS(pos, " delta_disks %d", seg->delta_disks);
/* If seg-data_offset == 1, kernel needs a zero offset to adjust to it */
if (seg->data_offset)
EMIT_PARAMS(pos, " data_offset %d", seg->data_offset == 1 ? 0 : seg->data_offset);
/* Target version >= 1.9.0 && < 1.11.0 had a table line parameter ordering flaw */
} else {
if (seg->data_copies > 1 && type == SEG_RAID10)
EMIT_PARAMS(pos, " raid10_copies %u", seg->data_copies);
if (seg->flags & DM_NOSYNC)
EMIT_PARAMS(pos, " nosync");
else if (seg->flags & DM_FORCESYNC)
EMIT_PARAMS(pos, " sync");
if (seg->region_size)
EMIT_PARAMS(pos, " region_size %u", seg->region_size);
/* If seg-data_offset == 1, kernel needs a zero offset to adjust to it */
if (seg->data_offset)
EMIT_PARAMS(pos, " data_offset %d", seg->data_offset == 1 ? 0 : seg->data_offset);
if (seg->delta_disks)
EMIT_PARAMS(pos, " delta_disks %d", seg->delta_disks);
for (i = 0; i < area_count; i++)
if (seg->rebuilds[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " rebuild %u", i);
for (i = 0; i < area_count; i++)
if (seg->writemostly[i/64] & (1ULL << (i%64)))
EMIT_PARAMS(pos, " write_mostly %u", i);
if (seg->writebehind)
EMIT_PARAMS(pos, " max_write_behind %u", seg->writebehind);
if (seg->max_recovery_rate)
EMIT_PARAMS(pos, " max_recovery_rate %u",
seg->max_recovery_rate);
if (seg->min_recovery_rate)
EMIT_PARAMS(pos, " min_recovery_rate %u",
seg->min_recovery_rate);
}
/* Print number of metadata/data device pairs */
EMIT_PARAMS(pos, " %u", area_count);
if (_emit_areas_line(dmt, seg, params, paramsize, &pos) <= 0)
return_0;
return 1;
}
static int _cache_emit_segment_line(struct dm_task *dmt,
struct load_segment *seg,
char *params, size_t paramsize)
{
int pos = 0;
/* unsigned feature_count; */
char data[DM_FORMAT_DEV_BUFSIZE];
char metadata[DM_FORMAT_DEV_BUFSIZE];
char origin[DM_FORMAT_DEV_BUFSIZE];
const char *name;
struct dm_config_node *cn;
/* Cache Dev */
if (!_build_dev_string(data, sizeof(data), seg->pool))
return_0;
/* Metadata Dev */
if (!_build_dev_string(metadata, sizeof(metadata), seg->metadata))
return_0;
/* Origin Dev */
if (!_build_dev_string(origin, sizeof(origin), seg->origin))
return_0;
EMIT_PARAMS(pos, "%s %s %s", metadata, data, origin);
/* Data block size */
EMIT_PARAMS(pos, " %u", seg->data_block_size);
/* Features */
/* feature_count = hweight32(seg->flags); */
/* EMIT_PARAMS(pos, " %u", feature_count); */
if (seg->flags & DM_CACHE_FEATURE_METADATA2)
EMIT_PARAMS(pos, " 2 metadata2 ");
else
EMIT_PARAMS(pos, " 1 ");
if (seg->flags & DM_CACHE_FEATURE_PASSTHROUGH)
EMIT_PARAMS(pos, "passthrough");
else if (seg->flags & DM_CACHE_FEATURE_WRITEBACK)
EMIT_PARAMS(pos, "writeback");
else
EMIT_PARAMS(pos, "writethrough");
/* Cache Policy */
name = seg->policy_name ? : "default";
EMIT_PARAMS(pos, " %s", name);
EMIT_PARAMS(pos, " %u", seg->policy_argc * 2);
if (seg->policy_settings)
for (cn = seg->policy_settings->child; cn; cn = cn->sib)
EMIT_PARAMS(pos, " %s %" PRIu64, cn->key, cn->v->v.i);
return 1;
}
static int _thin_pool_emit_segment_line(struct dm_task *dmt,
struct load_segment *seg,
char *params, size_t paramsize)
{
int pos = 0;
char pool[DM_FORMAT_DEV_BUFSIZE], metadata[DM_FORMAT_DEV_BUFSIZE];
int features = (seg->error_if_no_space ? 1 : 0) +
(seg->read_only ? 1 : 0) +
(seg->ignore_discard ? 1 : 0) +
(seg->no_discard_passdown ? 1 : 0) +
(seg->skip_block_zeroing ? 1 : 0);
if (!_build_dev_string(metadata, sizeof(metadata), seg->metadata))
return_0;
if (!_build_dev_string(pool, sizeof(pool), seg->pool))
return_0;
EMIT_PARAMS(pos, "%s %s %d %" PRIu64 " %d%s%s%s%s%s", metadata, pool,
seg->data_block_size, seg->low_water_mark, features,
seg->skip_block_zeroing ? " skip_block_zeroing" : "",
seg->ignore_discard ? " ignore_discard" : "",
seg->no_discard_passdown ? " no_discard_passdown" : "",
seg->error_if_no_space ? " error_if_no_space" : "",
seg->read_only ? " read_only" : ""
);
return 1;
}
static int _thin_emit_segment_line(struct dm_task *dmt,
struct load_segment *seg,
char *params, size_t paramsize)
{
int pos = 0;
char pool[DM_FORMAT_DEV_BUFSIZE];
char external[DM_FORMAT_DEV_BUFSIZE + 1];
if (!_build_dev_string(pool, sizeof(pool), seg->pool))
return_0;
if (!seg->external)
*external = 0;
else {
*external = ' ';
if (!_build_dev_string(external + 1, sizeof(external) - 1,
seg->external))
return_0;
}
EMIT_PARAMS(pos, "%s %d%s", pool, seg->device_id, external);
return 1;
}
static int _emit_segment_line(struct dm_task *dmt, uint32_t major,
uint32_t minor, struct load_segment *seg,
uint64_t *seg_start, char *params,
size_t paramsize)
{
int pos = 0;
int r;
int target_type_is_raid = 0;
char originbuf[DM_FORMAT_DEV_BUFSIZE], cowbuf[DM_FORMAT_DEV_BUFSIZE];
switch(seg->type) {
case SEG_ERROR:
case SEG_ZERO:
case SEG_LINEAR:
break;
case SEG_MIRRORED:
/* Mirrors are pretty complicated - now in separate function */
r = _mirror_emit_segment_line(dmt, seg, params, paramsize);
if (!r)
return_0;
break;
case SEG_REPLICATOR:
if ((r = _replicator_emit_segment_line(seg, params, paramsize,
&pos)) <= 0) {
stack;
return r;
}
break;
case SEG_REPLICATOR_DEV:
if (!seg->replicator || !_build_dev_string(originbuf,
sizeof(originbuf),
seg->replicator))
return_0;
EMIT_PARAMS(pos, "%s %" PRIu64, originbuf, seg->rdevice_index);
break;
case SEG_SNAPSHOT:
case SEG_SNAPSHOT_MERGE:
if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
return_0;
if (!_build_dev_string(cowbuf, sizeof(cowbuf), seg->cow))
return_0;
EMIT_PARAMS(pos, "%s %s %c %d", originbuf, cowbuf,
seg->persistent ? 'P' : 'N', seg->chunk_size);
break;
case SEG_SNAPSHOT_ORIGIN:
if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
return_0;
EMIT_PARAMS(pos, "%s", originbuf);
break;
case SEG_STRIPED:
EMIT_PARAMS(pos, "%u %u ", seg->area_count, seg->stripe_size);
break;
case SEG_CRYPT:
EMIT_PARAMS(pos, "%s%s%s%s%s %s %" PRIu64 " ", seg->cipher,
seg->chainmode ? "-" : "", seg->chainmode ?: "",
seg->iv ? "-" : "", seg->iv ?: "", seg->key,
seg->iv_offset != DM_CRYPT_IV_DEFAULT ?
seg->iv_offset : *seg_start);
break;
case SEG_RAID0:
case SEG_RAID0_META:
case SEG_RAID1:
case SEG_RAID10:
case SEG_RAID4:
case SEG_RAID5_N:
case SEG_RAID5_LA:
case SEG_RAID5_RA:
case SEG_RAID5_LS:
case SEG_RAID5_RS:
case SEG_RAID6_N_6:
case SEG_RAID6_ZR:
case SEG_RAID6_NR:
case SEG_RAID6_NC:
case SEG_RAID6_LS_6:
case SEG_RAID6_RS_6:
case SEG_RAID6_LA_6:
case SEG_RAID6_RA_6:
target_type_is_raid = 1;
r = _raid_emit_segment_line(dmt, major, minor, seg, seg_start,
params, paramsize);
if (!r)
return_0;
break;
case SEG_THIN_POOL:
if (!_thin_pool_emit_segment_line(dmt, seg, params, paramsize))
return_0;
break;
case SEG_THIN:
if (!_thin_emit_segment_line(dmt, seg, params, paramsize))
return_0;
break;
case SEG_CACHE:
if (!_cache_emit_segment_line(dmt, seg, params, paramsize))
return_0;
break;
}
switch(seg->type) {
case SEG_ERROR:
case SEG_REPLICATOR:
case SEG_SNAPSHOT:
case SEG_SNAPSHOT_ORIGIN:
case SEG_SNAPSHOT_MERGE:
case SEG_ZERO:
case SEG_THIN_POOL:
case SEG_THIN:
case SEG_CACHE:
break;
case SEG_CRYPT:
case SEG_LINEAR:
case SEG_REPLICATOR_DEV:
case SEG_STRIPED:
if ((r = _emit_areas_line(dmt, seg, params, paramsize, &pos)) <= 0) {
stack;
return r;
}
if (!params[0]) {
log_error("No parameters supplied for %s target "
"%u:%u.", _dm_segtypes[seg->type].target,
major, minor);
return 0;
}
break;
}
log_debug_activation("Adding target to (%" PRIu32 ":%" PRIu32 "): %" PRIu64
" %" PRIu64 " %s %s", major, minor,
*seg_start, seg->size, target_type_is_raid ? "raid" :
_dm_segtypes[seg->type].target, params);
if (!dm_task_add_target(dmt, *seg_start, seg->size,
target_type_is_raid ? "raid" :
_dm_segtypes[seg->type].target, params))
return_0;
*seg_start += seg->size;
return 1;
}
#undef EMIT_PARAMS
static int _emit_segment(struct dm_task *dmt, uint32_t major, uint32_t minor,
struct load_segment *seg, uint64_t *seg_start)
{
char *params;
size_t paramsize = 4096; /* FIXME: too small for long RAID lines when > 64 devices supported */
int ret;
do {
if (!(params = dm_malloc(paramsize))) {
log_error("Insufficient space for target parameters.");
return 0;
}
params[0] = '\0';
ret = _emit_segment_line(dmt, major, minor, seg, seg_start,
params, paramsize);
dm_free(params);
if (!ret)
stack;
if (ret >= 0)
return ret;
log_debug_activation("Insufficient space in params[%" PRIsize_t
"] for target parameters.", paramsize);
paramsize *= 2;
} while (paramsize < MAX_TARGET_PARAMSIZE);
log_error("Target parameter size too big. Aborting.");
return 0;
}
static int _load_node(struct dm_tree_node *dnode)
{
int r = 0;
struct dm_task *dmt;
struct load_segment *seg;
uint64_t seg_start = 0, existing_table_size;
log_verbose("Loading %s table (%" PRIu32 ":%" PRIu32 ")", dnode->name,
dnode->info.major, dnode->info.minor);
if (!(dmt = dm_task_create(DM_DEVICE_RELOAD))) {
log_error("Reload dm_task creation failed for %s", dnode->name);
return 0;
}
if (!dm_task_set_major(dmt, dnode->info.major) ||
!dm_task_set_minor(dmt, dnode->info.minor)) {
log_error("Failed to set device number for %s reload.", dnode->name);
goto out;
}
if (dnode->props.read_only && !dm_task_set_ro(dmt)) {
log_error("Failed to set read only flag for %s", dnode->name);
goto out;
}
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
dm_list_iterate_items(seg, &dnode->props.segs)
if (!_emit_segment(dmt, dnode->info.major, dnode->info.minor,
seg, &seg_start))
goto_out;
if (!dm_task_suppress_identical_reload(dmt))
log_error("Failed to suppress reload of identical tables.");
if ((r = dm_task_run(dmt))) {
r = dm_task_get_info(dmt, &dnode->info);
if (r && !dnode->info.inactive_table)
log_verbose("Suppressed %s (%" PRIu32 ":%" PRIu32
") identical table reload.",
dnode->name,
dnode->info.major, dnode->info.minor);
existing_table_size = dm_task_get_existing_table_size(dmt);
if ((dnode->props.size_changed =
(existing_table_size == seg_start) ? 0 :
(existing_table_size > seg_start) ? -1 : 1)) {
/*
* Kernel usually skips size validation on zero-length devices
* now so no need to preload them.
*/
/* FIXME In which kernel version did this begin? */
if (!existing_table_size && dnode->props.delay_resume_if_new)
dnode->props.size_changed = 0;
log_debug_activation("Table size changed from %" PRIu64 " to %"
PRIu64 " for %s (%" PRIu32 ":%" PRIu32 ").%s",
existing_table_size, seg_start, dnode->name,
dnode->info.major, dnode->info.minor,
dnode->props.size_changed ? "" : " (Ignoring.)");
}
}
dnode->props.segment_count = 0;
out:
dm_task_destroy(dmt);
return r;
}
/*
* Currently try to deactivate only nodes created during preload.
* New node is always attached to the front of activated_list
*/
static int _dm_tree_revert_activated(struct dm_tree_node *parent)
{
struct dm_tree_node *child;
dm_list_iterate_items_gen(child, &parent->activated, activated_list) {
log_debug_activation("Reverting %s.", child->name);
if (child->callback) {
log_debug_activation("Dropping callback for %s.", child->name);
child->callback = NULL;
}
if (!_deactivate_node(child->name, child->info.major, child->info.minor,
&child->dtree->cookie, child->udev_flags, 0)) {
log_error("Unable to deactivate %s (%" PRIu32
":%" PRIu32 ")", child->name, child->info.major,
child->info.minor);
return 0;
}
if (!_dm_tree_revert_activated(child))
return_0;
}
return 1;
}
int dm_tree_preload_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
int r = 1, node_created = 0;
void *handle = NULL;
struct dm_tree_node *child;
struct dm_info newinfo;
int update_devs_flag = 0;
struct load_segment *seg;
/* Preload children first */
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
/* Propagate delay of resume from parent node */
if (dnode->props.delay_resume_if_new > 1)
child->props.delay_resume_if_new = dnode->props.delay_resume_if_new;
/* Skip existing non-device-mapper devices */
if (!child->info.exists && child->info.major)
continue;
/* Ignore if it doesn't belong to this VG */
if (child->info.exists &&
!_uuid_prefix_matches(child->uuid, uuid_prefix, uuid_prefix_len))
continue;
if (dm_tree_node_num_children(child, 0))
if (!dm_tree_preload_children(child, uuid_prefix, uuid_prefix_len))
return_0;
/* FIXME Cope if name exists with no uuid? */
if (!child->info.exists && !(node_created = _create_node(child)))
return_0;
if (!child->info.inactive_table &&
child->props.segment_count &&
!_load_node(child)) {
/*
* If the table load does not succeed, we remove the
* device in the kernel that would otherwise have an
* empty table. This makes the create + load of the
* device atomic. However, if other dependencies have
* already been created and loaded; this code is
* insufficient to remove those - only the node
* encountering the table load failure is removed.
*/
if (node_created && !_remove_node(child))
return_0;
return_0;
}
/* Propagate device size change change */
if (child->props.size_changed > 0 && !dnode->props.size_changed)
dnode->props.size_changed = 1;
else if (child->props.size_changed < 0)
dnode->props.size_changed = -1;
/* No resume for a device without parents or with unchanged or smaller size */
if (!dm_tree_node_num_children(child, 1) || (child->props.size_changed <= 0))
continue;
if (!node_created && (dm_list_size(&child->props.segs) == 1)) {
/* If thin-pool child nodes were preloaded WITH changed size
* skip device resume, as this is likely resize of data or
* metadata device and so thin pool needs suspend before
* resume operation.
* Note: child->props.segment_count is already 0 here
*/
seg = dm_list_item(dm_list_last(&child->props.segs),
struct load_segment);
if (seg->type == SEG_THIN_POOL) {
log_debug_activation("Skipping resume of thin-pool %s.",
child->name);
continue;
}
}
if (!child->info.inactive_table && !child->info.suspended)
continue;
if (!_resume_node(child->name, child->info.major, child->info.minor,
child->props.read_ahead, child->props.read_ahead_flags,
&newinfo, &child->dtree->cookie, child->udev_flags,
child->info.suspended)) {
log_error("Unable to resume %s (%" PRIu32
":%" PRIu32 ")", child->name, child->info.major,
child->info.minor);
/* If the device was not previously active, we might as well remove this node. */
if (!child->info.live_table &&
!_deactivate_node(child->name, child->info.major, child->info.minor,
&child->dtree->cookie, child->udev_flags, 0))
log_error("Unable to deactivate %s (%" PRIu32
":%" PRIu32 ")", child->name, child->info.major,
child->info.minor);
r = 0;
/* Each child is handled independently */
continue;
}
if (!child->info.live_table) {
/* Collect newly introduced devices for revert */
dm_list_add_h(&dnode->activated, &child->activated_list);
/* When creating new node also check transaction_id. */
if (child->props.send_messages &&
!_node_send_messages(child, uuid_prefix, uuid_prefix_len, 0)) {
stack;
if (!dm_udev_wait(dm_tree_get_cookie(dnode)))
stack;
dm_tree_set_cookie(dnode, 0);
(void) _dm_tree_revert_activated(dnode);
r = 0;
continue;
}
}
/* Update cached info */
child->info = newinfo;
/*
* Prepare for immediate synchronization with udev and flush all stacked
* dev node operations if requested by immediate_dev_node property. But
* finish processing current level in the tree first.
*/
if (child->props.immediate_dev_node)
update_devs_flag = 1;
}
if (update_devs_flag ||
(r && !dnode->info.exists && dnode->callback)) {
if (!dm_udev_wait(dm_tree_get_cookie(dnode)))
stack;
dm_tree_set_cookie(dnode, 0);
if (r && !dnode->info.exists && dnode->callback &&
!dnode->callback(dnode, DM_NODE_CALLBACK_PRELOADED,
dnode->callback_data))
{
/* Try to deactivate what has been activated in preload phase */
(void) _dm_tree_revert_activated(dnode);
return_0;
}
}
return r;
}
/*
* Returns 1 if unsure.
*/
int dm_tree_children_use_uuid(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
void *handle = NULL;
struct dm_tree_node *child = dnode;
const char *uuid;
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
if (!(uuid = dm_tree_node_get_uuid(child))) {
log_error("Failed to get uuid for dtree node.");
return 1;
}
if (_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
return 1;
if (dm_tree_node_num_children(child, 0))
dm_tree_children_use_uuid(child, uuid_prefix, uuid_prefix_len);
}
return 0;
}
/*
* Target functions
*/
static struct load_segment *_add_segment(struct dm_tree_node *dnode, unsigned type, uint64_t size)
{
struct load_segment *seg;
if (!(seg = dm_pool_zalloc(dnode->dtree->mem, sizeof(*seg)))) {
log_error("dtree node segment allocation failed");
return NULL;
}
seg->type = type;
seg->size = size;
dm_list_init(&seg->areas);
dm_list_add(&dnode->props.segs, &seg->list);
dnode->props.segment_count++;
return seg;
}
int dm_tree_node_add_snapshot_origin_target(struct dm_tree_node *dnode,
uint64_t size,
const char *origin_uuid)
{
struct load_segment *seg;
struct dm_tree_node *origin_node;
if (!(seg = _add_segment(dnode, SEG_SNAPSHOT_ORIGIN, size)))
return_0;
if (!(origin_node = dm_tree_find_node_by_uuid(dnode->dtree, origin_uuid))) {
log_error("Couldn't find snapshot origin uuid %s.", origin_uuid);
return 0;
}
seg->origin = origin_node;
if (!_link_tree_nodes(dnode, origin_node))
return_0;
/* Resume snapshot origins after new snapshots */
dnode->activation_priority = 1;
/*
* Don't resume the origin immediately in case it is a non-trivial
* target that must not be active more than once concurrently!
*/
origin_node->props.delay_resume_if_new = 1;
return 1;
}
static int _add_snapshot_target(struct dm_tree_node *node,
uint64_t size,
const char *origin_uuid,
const char *cow_uuid,
const char *merge_uuid,
int persistent,
uint32_t chunk_size)
{
struct load_segment *seg;
struct dm_tree_node *origin_node, *cow_node, *merge_node;
unsigned seg_type;
seg_type = !merge_uuid ? SEG_SNAPSHOT : SEG_SNAPSHOT_MERGE;
if (!(seg = _add_segment(node, seg_type, size)))
return_0;
if (!(origin_node = dm_tree_find_node_by_uuid(node->dtree, origin_uuid))) {
log_error("Couldn't find snapshot origin uuid %s.", origin_uuid);
return 0;
}
seg->origin = origin_node;
if (!_link_tree_nodes(node, origin_node))
return_0;
if (!(cow_node = dm_tree_find_node_by_uuid(node->dtree, cow_uuid))) {
log_error("Couldn't find snapshot COW device uuid %s.", cow_uuid);
return 0;
}
seg->cow = cow_node;
if (!_link_tree_nodes(node, cow_node))
return_0;
seg->persistent = persistent ? 1 : 0;
seg->chunk_size = chunk_size;
if (merge_uuid) {
if (!(merge_node = dm_tree_find_node_by_uuid(node->dtree, merge_uuid))) {
/* not a pure error, merging snapshot may have been deactivated */
log_verbose("Couldn't find merging snapshot uuid %s.", merge_uuid);
} else {
seg->merge = merge_node;
/* must not link merging snapshot, would undermine activation_priority below */
}
/* Resume snapshot-merge (acting origin) after other snapshots */
node->activation_priority = 1;
if (seg->merge) {
/* Resume merging snapshot after snapshot-merge */
seg->merge->activation_priority = 2;
}
}
return 1;
}
int dm_tree_node_add_snapshot_target(struct dm_tree_node *node,
uint64_t size,
const char *origin_uuid,
const char *cow_uuid,
int persistent,
uint32_t chunk_size)
{
return _add_snapshot_target(node, size, origin_uuid, cow_uuid,
NULL, persistent, chunk_size);
}
int dm_tree_node_add_snapshot_merge_target(struct dm_tree_node *node,
uint64_t size,
const char *origin_uuid,
const char *cow_uuid,
const char *merge_uuid,
uint32_t chunk_size)
{
return _add_snapshot_target(node, size, origin_uuid, cow_uuid,
merge_uuid, 1, chunk_size);
}
int dm_tree_node_add_error_target(struct dm_tree_node *node,
uint64_t size)
{
if (!_add_segment(node, SEG_ERROR, size))
return_0;
return 1;
}
int dm_tree_node_add_zero_target(struct dm_tree_node *node,
uint64_t size)
{
if (!_add_segment(node, SEG_ZERO, size))
return_0;
return 1;
}
int dm_tree_node_add_linear_target(struct dm_tree_node *node,
uint64_t size)
{
if (!_add_segment(node, SEG_LINEAR, size))
return_0;
return 1;
}
int dm_tree_node_add_striped_target(struct dm_tree_node *node,
uint64_t size,
uint32_t stripe_size)
{
struct load_segment *seg;
if (!(seg = _add_segment(node, SEG_STRIPED, size)))
return_0;
seg->stripe_size = stripe_size;
return 1;
}
int dm_tree_node_add_crypt_target(struct dm_tree_node *node,
uint64_t size,
const char *cipher,
const char *chainmode,
const char *iv,
uint64_t iv_offset,
const char *key)
{
struct load_segment *seg;
if (!(seg = _add_segment(node, SEG_CRYPT, size)))
return_0;
seg->cipher = cipher;
seg->chainmode = chainmode;
seg->iv = iv;
seg->iv_offset = iv_offset;
seg->key = key;
return 1;
}
int dm_tree_node_add_mirror_target_log(struct dm_tree_node *node,
uint32_t region_size,
unsigned clustered,
const char *log_uuid,
unsigned area_count,
uint32_t flags)
{
struct dm_tree_node *log_node = NULL;
struct load_segment *seg;
if (!node->props.segment_count) {
log_error(INTERNAL_ERROR "Attempt to add target area to missing segment.");
return 0;
}
seg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
if (log_uuid) {
if (!(seg->uuid = dm_pool_strdup(node->dtree->mem, log_uuid))) {
log_error("log uuid pool_strdup failed");
return 0;
}
if ((flags & DM_CORELOG))
/* For pvmove: immediate resume (for size validation) isn't needed. */
/* pvmove flag passed via unused UUID and its suffix */
node->props.delay_resume_if_new = strstr(log_uuid, "pvmove") ? 2 : 1;
else {
if (!(log_node = dm_tree_find_node_by_uuid(node->dtree, log_uuid))) {
log_error("Couldn't find mirror log uuid %s.", log_uuid);
return 0;
}
if (clustered)
log_node->props.immediate_dev_node = 1;
/* The kernel validates the size of disk logs. */
/* FIXME Propagate to any devices below */
log_node->props.delay_resume_if_new = 0;
if (!_link_tree_nodes(node, log_node))
return_0;
}
}
seg->log = log_node;
seg->region_size = region_size;
seg->clustered = clustered;
seg->mirror_area_count = area_count;
seg->flags = flags;
return 1;
}
int dm_tree_node_add_mirror_target(struct dm_tree_node *node,
uint64_t size)
{
if (!_add_segment(node, SEG_MIRRORED, size))
return_0;
return 1;
}
int dm_tree_node_add_raid_target_with_params(struct dm_tree_node *node,
uint64_t size,
const struct dm_tree_node_raid_params *p)
{
unsigned i;
struct load_segment *seg = NULL;
for (i = 0; i < DM_ARRAY_SIZE(_dm_segtypes) && !seg; ++i)
if (!strcmp(p->raid_type, _dm_segtypes[i].target))
if (!(seg = _add_segment(node,
_dm_segtypes[i].type, size)))
return_0;
if (!seg) {
log_error("Unsupported raid type %s.", p->raid_type);
return 0;
}
seg->region_size = p->region_size;
seg->stripe_size = p->stripe_size;
seg->area_count = 0;
memset(seg->rebuilds, 0, sizeof(seg->rebuilds));
seg->rebuilds[0] = p->rebuilds;
memset(seg->writemostly, 0, sizeof(seg->writemostly));
seg->writemostly[0] = p->writemostly;
seg->writebehind = p->writebehind;
seg->min_recovery_rate = p->min_recovery_rate;
seg->max_recovery_rate = p->max_recovery_rate;
seg->flags = p->flags;
return 1;
}
int dm_tree_node_add_raid_target(struct dm_tree_node *node,
uint64_t size,
const char *raid_type,
uint32_t region_size,
uint32_t stripe_size,
uint64_t rebuilds,
uint64_t flags)
{
struct dm_tree_node_raid_params params = {
.raid_type = raid_type,
.region_size = region_size,
.stripe_size = stripe_size,
.rebuilds = rebuilds,
.flags = flags
};
return dm_tree_node_add_raid_target_with_params(node, size, &params);
}
/*
* Version 2 of dm_tree_node_add_raid_target() allowing for:
*
* - maximum 253 legs in a raid set (MD kernel limitation)
* - delta_disks for disk add/remove reshaping
* - data_offset for out-of-place reshaping
* - data_copies to cope witth odd numbers of raid10 disks
*/
int dm_tree_node_add_raid_target_with_params_v2(struct dm_tree_node *node,
uint64_t size,
const struct dm_tree_node_raid_params_v2 *p)
{
unsigned i;
struct load_segment *seg = NULL;
for (i = 0; i < DM_ARRAY_SIZE(_dm_segtypes) && !seg; ++i)
if (!strcmp(p->raid_type, _dm_segtypes[i].target))
if (!(seg = _add_segment(node,
_dm_segtypes[i].type, size)))
return_0;
if (!seg) {
log_error("Unsupported raid type %s.", p->raid_type);
return 0;
}
seg->region_size = p->region_size;
seg->stripe_size = p->stripe_size;
seg->area_count = 0;
seg->delta_disks = p->delta_disks;
seg->data_offset = p->data_offset;
memcpy(seg->rebuilds, p->rebuilds, sizeof(seg->rebuilds));
memcpy(seg->writemostly, p->writemostly, sizeof(seg->writemostly));
seg->writebehind = p->writebehind;
seg->data_copies = p->data_copies;
seg->min_recovery_rate = p->min_recovery_rate;
seg->max_recovery_rate = p->max_recovery_rate;
seg->flags = p->flags;
return 1;
}
int dm_tree_node_add_cache_target(struct dm_tree_node *node,
uint64_t size,
uint64_t feature_flags, /* DM_CACHE_FEATURE_* */
const char *metadata_uuid,
const char *data_uuid,
const char *origin_uuid,
const char *policy_name,
const struct dm_config_node *policy_settings,
uint32_t data_block_size)
{
struct dm_config_node *cn;
struct load_segment *seg;
static const uint64_t _modemask =
DM_CACHE_FEATURE_PASSTHROUGH |
DM_CACHE_FEATURE_WRITETHROUGH |
DM_CACHE_FEATURE_WRITEBACK;
/* Detect unknown (bigger) feature bit */
if (feature_flags >= (DM_CACHE_FEATURE_METADATA2 * 2)) {
log_error("Unsupported cache's feature flags set " FMTu64 ".",
feature_flags);
return 0;
}
switch (feature_flags & _modemask) {
case DM_CACHE_FEATURE_PASSTHROUGH:
case DM_CACHE_FEATURE_WRITEBACK:
if (strcmp(policy_name, "cleaner") == 0) {
/* Enforce writethrough mode for cleaner policy */
feature_flags = ~_modemask;
feature_flags |= DM_CACHE_FEATURE_WRITETHROUGH;
}
/* Fall through */
case DM_CACHE_FEATURE_WRITETHROUGH:
break;
default:
log_error("Invalid cache's feature flag " FMTu64 ".",
feature_flags);
return 0;
}
if (data_block_size < DM_CACHE_MIN_DATA_BLOCK_SIZE) {
log_error("Data block size %u is lower then %u sectors.",
data_block_size, DM_CACHE_MIN_DATA_BLOCK_SIZE);
return 0;
}
if (data_block_size > DM_CACHE_MAX_DATA_BLOCK_SIZE) {
log_error("Data block size %u is higher then %u sectors.",
data_block_size, DM_CACHE_MAX_DATA_BLOCK_SIZE);
return 0;
}
if (!(seg = _add_segment(node, SEG_CACHE, size)))
return_0;
if (!(seg->pool = dm_tree_find_node_by_uuid(node->dtree,
data_uuid))) {
log_error("Missing cache's data uuid %s.",
data_uuid);
return 0;
}
if (!_link_tree_nodes(node, seg->pool))
return_0;
if (!(seg->metadata = dm_tree_find_node_by_uuid(node->dtree,
metadata_uuid))) {
log_error("Missing cache's metadata uuid %s.",
metadata_uuid);
return 0;
}
if (!_link_tree_nodes(node, seg->metadata))
return_0;
if (!(seg->origin = dm_tree_find_node_by_uuid(node->dtree,
origin_uuid))) {
log_error("Missing cache's origin uuid %s.",
metadata_uuid);
return 0;
}
if (!_link_tree_nodes(node, seg->origin))
return_0;
seg->data_block_size = data_block_size;
seg->flags = feature_flags;
seg->policy_name = policy_name;
/* FIXME: better validation missing */
if (policy_settings) {
if (!(seg->policy_settings = dm_config_clone_node_with_mem(node->dtree->mem, policy_settings, 0)))
return_0;
for (cn = seg->policy_settings->child; cn; cn = cn->sib) {
if (!cn->v || (cn->v->type != DM_CFG_INT)) {
/* For now only <key> = <int> pairs are supported */
log_error("Cache policy parameter %s is without integer value.", cn->key);
return 0;
}
seg->policy_argc++;
}
}
return 1;
}
int dm_tree_node_add_replicator_target(struct dm_tree_node *node,
uint64_t size,
const char *rlog_uuid,
const char *rlog_type,
unsigned rsite_index,
dm_replicator_mode_t mode,
uint32_t async_timeout,
uint64_t fall_behind_data,
uint32_t fall_behind_ios)
{
struct load_segment *rseg;
struct replicator_site *rsite;
/* Local site0 - adds replicator segment and links rlog device */
if (rsite_index == REPLICATOR_LOCAL_SITE) {
if (node->props.segment_count) {
log_error(INTERNAL_ERROR "Attempt to add replicator segment to already used node.");
return 0;
}
if (!(rseg = _add_segment(node, SEG_REPLICATOR, size)))
return_0;
if (!(rseg->log = dm_tree_find_node_by_uuid(node->dtree, rlog_uuid))) {
log_error("Missing replicator log uuid %s.", rlog_uuid);
return 0;
}
if (!_link_tree_nodes(node, rseg->log))
return_0;
if (strcmp(rlog_type, "ringbuffer") != 0) {
log_error("Unsupported replicator log type %s.", rlog_type);
return 0;
}
if (!(rseg->rlog_type = dm_pool_strdup(node->dtree->mem, rlog_type)))
return_0;
dm_list_init(&rseg->rsites);
rseg->rdevice_count = 0;
node->activation_priority = 1;
}
/* Add site to segment */
if (mode == DM_REPLICATOR_SYNC
&& (async_timeout || fall_behind_ios || fall_behind_data)) {
log_error("Async parameters passed for synchronnous replicator.");
return 0;
}
if (node->props.segment_count != 1) {
log_error(INTERNAL_ERROR "Attempt to add remote site area before setting replicator log.");
return 0;
}
rseg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
if (rseg->type != SEG_REPLICATOR) {
log_error(INTERNAL_ERROR "Attempt to use non replicator segment %s.",
_dm_segtypes[rseg->type].target);
return 0;
}
if (!(rsite = dm_pool_zalloc(node->dtree->mem, sizeof(*rsite)))) {
log_error("Failed to allocate remote site segment.");
return 0;
}
dm_list_add(&rseg->rsites, &rsite->list);
rseg->rsite_count++;
rsite->mode = mode;
rsite->async_timeout = async_timeout;
rsite->fall_behind_data = fall_behind_data;
rsite->fall_behind_ios = fall_behind_ios;
rsite->rsite_index = rsite_index;
return 1;
}
/* Appends device node to Replicator */
int dm_tree_node_add_replicator_dev_target(struct dm_tree_node *node,
uint64_t size,
const char *replicator_uuid,
uint64_t rdevice_index,
const char *rdev_uuid,
unsigned rsite_index,
const char *slog_uuid,
uint32_t slog_flags,
uint32_t slog_region_size)
{
struct seg_area *area;
struct load_segment *rseg;
struct load_segment *rep_seg;
if (rsite_index == REPLICATOR_LOCAL_SITE) {
/* Site index for local target */
if (!(rseg = _add_segment(node, SEG_REPLICATOR_DEV, size)))
return_0;
if (!(rseg->replicator = dm_tree_find_node_by_uuid(node->dtree, replicator_uuid))) {
log_error("Missing replicator uuid %s.", replicator_uuid);
return 0;
}
/* Local slink0 for replicator must be always initialized first */
if (rseg->replicator->props.segment_count != 1) {
log_error(INTERNAL_ERROR "Attempt to use non replicator segment.");
return 0;
}
rep_seg = dm_list_item(dm_list_last(&rseg->replicator->props.segs), struct load_segment);
if (rep_seg->type != SEG_REPLICATOR) {
log_error(INTERNAL_ERROR "Attempt to use non replicator segment %s.",
_dm_segtypes[rep_seg->type].target);
return 0;
}
rep_seg->rdevice_count++;
if (!_link_tree_nodes(node, rseg->replicator))
return_0;
rseg->rdevice_index = rdevice_index;
} else {
/* Local slink0 for replicator must be always initialized first */
if (node->props.segment_count != 1) {
log_error(INTERNAL_ERROR "Attempt to use non replicator-dev segment.");
return 0;
}
rseg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
if (rseg->type != SEG_REPLICATOR_DEV) {
log_error(INTERNAL_ERROR "Attempt to use non replicator-dev segment %s.",
_dm_segtypes[rseg->type].target);
return 0;
}
}
if (!(slog_flags & DM_CORELOG) && !slog_uuid) {
log_error("Unspecified sync log uuid.");
return 0;
}
if (!dm_tree_node_add_target_area(node, NULL, rdev_uuid, 0))
return_0;
area = dm_list_item(dm_list_last(&rseg->areas), struct seg_area);
if (!(slog_flags & DM_CORELOG)) {
if (!(area->slog = dm_tree_find_node_by_uuid(node->dtree, slog_uuid))) {
log_error("Couldn't find sync log uuid %s.", slog_uuid);
return 0;
}
if (!_link_tree_nodes(node, area->slog))
return_0;
}
area->flags = slog_flags;
area->region_size = slog_region_size;
area->rsite_index = rsite_index;
return 1;
}
static struct load_segment *_get_single_load_segment(struct dm_tree_node *node,
unsigned type)
{
struct load_segment *seg;
if (node->props.segment_count != 1) {
log_error("Node %s must have only one segment.",
_dm_segtypes[type].target);
return NULL;
}
seg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
if (seg->type != type) {
log_error("Node %s has segment type %s.",
_dm_segtypes[type].target,
_dm_segtypes[seg->type].target);
return NULL;
}
return seg;
}
static int _thin_validate_device_id(uint32_t device_id)
{
if (device_id > DM_THIN_MAX_DEVICE_ID) {
log_error("Device id %u is higher then %u.",
device_id, DM_THIN_MAX_DEVICE_ID);
return 0;
}
return 1;
}
int dm_tree_node_add_thin_pool_target(struct dm_tree_node *node,
uint64_t size,
uint64_t transaction_id,
const char *metadata_uuid,
const char *pool_uuid,
uint32_t data_block_size,
uint64_t low_water_mark,
unsigned skip_block_zeroing)
{
struct load_segment *seg, *mseg;
uint64_t devsize = 0;
if (data_block_size < DM_THIN_MIN_DATA_BLOCK_SIZE) {
log_error("Data block size %u is lower then %u sectors.",
data_block_size, DM_THIN_MIN_DATA_BLOCK_SIZE);
return 0;
}
if (data_block_size > DM_THIN_MAX_DATA_BLOCK_SIZE) {
log_error("Data block size %u is higher then %u sectors.",
data_block_size, DM_THIN_MAX_DATA_BLOCK_SIZE);
return 0;
}
if (!(seg = _add_segment(node, SEG_THIN_POOL, size)))
return_0;
if (!(seg->metadata = dm_tree_find_node_by_uuid(node->dtree, metadata_uuid))) {
log_error("Missing metadata uuid %s.", metadata_uuid);
return 0;
}
if (!_link_tree_nodes(node, seg->metadata))
return_0;
/* FIXME: more complex target may need more tweaks */
dm_list_iterate_items(mseg, &seg->metadata->props.segs) {
devsize += mseg->size;
if (devsize > DM_THIN_MAX_METADATA_SIZE) {
log_debug_activation("Ignoring %" PRIu64 " of device.",
devsize - DM_THIN_MAX_METADATA_SIZE);
mseg->size -= (devsize - DM_THIN_MAX_METADATA_SIZE);
devsize = DM_THIN_MAX_METADATA_SIZE;
/* FIXME: drop remaining segs */
}
}
if (!(seg->pool = dm_tree_find_node_by_uuid(node->dtree, pool_uuid))) {
log_error("Missing pool uuid %s.", pool_uuid);
return 0;
}
if (!_link_tree_nodes(node, seg->pool))
return_0;
/* Clean flag delay_resume_if_new - so corelog gets resumed */
seg->metadata->props.delay_resume_if_new = 0;
seg->pool->props.delay_resume_if_new = 0;
/* Validate only transaction_id > 0 when activating thin-pool */
node->props.send_messages = transaction_id ? 1 : 0;
seg->transaction_id = transaction_id;
seg->low_water_mark = low_water_mark;
seg->data_block_size = data_block_size;
seg->skip_block_zeroing = skip_block_zeroing;
dm_list_init(&seg->thin_messages);
return 1;
}
int dm_tree_node_add_thin_pool_message(struct dm_tree_node *node,
dm_thin_message_t type,
uint64_t id1, uint64_t id2)
{
struct thin_message *tm;
struct load_segment *seg;
if (!(seg = _get_single_load_segment(node, SEG_THIN_POOL)))
return_0;
if (!(tm = dm_pool_zalloc(node->dtree->mem, sizeof (*tm)))) {
log_error("Failed to allocate thin message.");
return 0;
}
switch (type) {
case DM_THIN_MESSAGE_CREATE_SNAP:
/* If the thin origin is active, it must be suspend first! */
if (id1 == id2) {
log_error("Cannot use same device id for origin and its snapshot.");
return 0;
}
if (!_thin_validate_device_id(id1) ||
!_thin_validate_device_id(id2))
return_0;
tm->message.u.m_create_snap.device_id = id1;
tm->message.u.m_create_snap.origin_id = id2;
break;
case DM_THIN_MESSAGE_CREATE_THIN:
if (!_thin_validate_device_id(id1))
return_0;
tm->message.u.m_create_thin.device_id = id1;
tm->expected_errno = EEXIST;
break;
case DM_THIN_MESSAGE_DELETE:
if (!_thin_validate_device_id(id1))
return_0;
tm->message.u.m_delete.device_id = id1;
tm->expected_errno = ENODATA;
break;
case DM_THIN_MESSAGE_SET_TRANSACTION_ID:
if ((id1 + 1) != id2) {
log_error("New transaction id must be sequential.");
return 0; /* FIXME: Maybe too strict here? */
}
if (id2 != seg->transaction_id) {
log_error("Current transaction id is different from thin pool.");
return 0; /* FIXME: Maybe too strict here? */
}
tm->message.u.m_set_transaction_id.current_id = id1;
tm->message.u.m_set_transaction_id.new_id = id2;
break;
default:
log_error("Unsupported message type %d.", (int) type);
return 0;
}
tm->message.type = type;
dm_list_add(&seg->thin_messages, &tm->list);
/* Higher value >1 identifies there are really some messages */
node->props.send_messages = 2;
return 1;
}
int dm_tree_node_set_thin_pool_discard(struct dm_tree_node *node,
unsigned ignore,
unsigned no_passdown)
{
struct load_segment *seg;
if (!(seg = _get_single_load_segment(node, SEG_THIN_POOL)))
return_0;
seg->ignore_discard = ignore;
seg->no_discard_passdown = no_passdown;
return 1;
}
int dm_tree_node_set_thin_pool_error_if_no_space(struct dm_tree_node *node,
unsigned error_if_no_space)
{
struct load_segment *seg;
if (!(seg = _get_single_load_segment(node, SEG_THIN_POOL)))
return_0;
seg->error_if_no_space = error_if_no_space;
return 1;
}
int dm_tree_node_set_thin_pool_read_only(struct dm_tree_node *node,
unsigned read_only)
{
struct load_segment *seg;
if (!(seg = _get_single_load_segment(node, SEG_THIN_POOL)))
return_0;
seg->read_only = read_only;
return 1;
}
int dm_tree_node_add_thin_target(struct dm_tree_node *node,
uint64_t size,
const char *pool_uuid,
uint32_t device_id)
{
struct dm_tree_node *pool;
struct load_segment *seg;
if (!(pool = dm_tree_find_node_by_uuid(node->dtree, pool_uuid))) {
log_error("Missing thin pool uuid %s.", pool_uuid);
return 0;
}
if (!_link_tree_nodes(node, pool))
return_0;
if (!_thin_validate_device_id(device_id))
return_0;
if (!(seg = _add_segment(node, SEG_THIN, size)))
return_0;
seg->pool = pool;
seg->device_id = device_id;
return 1;
}
int dm_tree_node_set_thin_external_origin(struct dm_tree_node *node,
const char *external_uuid)
{
struct dm_tree_node *external;
struct load_segment *seg;
if (!(seg = _get_single_load_segment(node, SEG_THIN)))
return_0;
if (!(external = dm_tree_find_node_by_uuid(node->dtree,
external_uuid))) {
log_error("Missing thin external origin uuid %s.",
external_uuid);
return 0;
}
if (!_link_tree_nodes(node, external))
return_0;
seg->external = external;
return 1;
}
static int _add_area(struct dm_tree_node *node, struct load_segment *seg, struct dm_tree_node *dev_node, uint64_t offset)
{
struct seg_area *area;
if (!(area = dm_pool_zalloc(node->dtree->mem, sizeof (*area)))) {
log_error("Failed to allocate target segment area.");
return 0;
}
area->dev_node = dev_node;
area->offset = offset;
dm_list_add(&seg->areas, &area->list);
seg->area_count++;
return 1;
}
int dm_tree_node_add_target_area(struct dm_tree_node *node,
const char *dev_name,
const char *uuid,
uint64_t offset)
{
struct load_segment *seg;
struct stat info;
struct dm_tree_node *dev_node;
if ((!dev_name || !*dev_name) && (!uuid || !*uuid)) {
log_error("dm_tree_node_add_target_area called without device");
return 0;
}
if (uuid) {
if (!(dev_node = dm_tree_find_node_by_uuid(node->dtree, uuid))) {
log_error("Couldn't find area uuid %s.", uuid);
return 0;
}
if (!_link_tree_nodes(node, dev_node))
return_0;
} else {
if (stat(dev_name, &info) < 0) {
log_error("Device %s not found.", dev_name);
return 0;
}
if (!S_ISBLK(info.st_mode)) {
log_error("Device %s is not a block device.", dev_name);
return 0;
}
/* FIXME Check correct macro use */
if (!(dev_node = _add_dev(node->dtree, node, MAJOR(info.st_rdev),
MINOR(info.st_rdev), 0, 0)))
return_0;
}
if (!node->props.segment_count) {
log_error(INTERNAL_ERROR "Attempt to add target area to missing segment.");
return 0;
}
seg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
if (!_add_area(node, seg, dev_node, offset))
return_0;
return 1;
}
int dm_tree_node_add_null_area(struct dm_tree_node *node, uint64_t offset)
{
struct load_segment *seg;
seg = dm_list_item(dm_list_last(&node->props.segs), struct load_segment);
switch (seg->type) {
case SEG_RAID0:
case SEG_RAID0_META:
case SEG_RAID1:
case SEG_RAID4:
case SEG_RAID5_N:
case SEG_RAID5_LA:
case SEG_RAID5_RA:
case SEG_RAID5_LS:
case SEG_RAID5_RS:
case SEG_RAID6_N_6:
case SEG_RAID6_ZR:
case SEG_RAID6_NR:
case SEG_RAID6_NC:
case SEG_RAID6_LS_6:
case SEG_RAID6_RS_6:
case SEG_RAID6_LA_6:
case SEG_RAID6_RA_6:
break;
default:
log_error("dm_tree_node_add_null_area() called on an unsupported segment type");
return 0;
}
if (!_add_area(node, seg, NULL, offset))
return_0;
return 1;
}
void dm_tree_node_set_callback(struct dm_tree_node *dnode,
dm_node_callback_fn cb, void *data)
{
dnode->callback = cb;
dnode->callback_data = data;
}
#if defined(__GNUC__)
/*
* Backward compatible implementations.
*
* Keep these at the end of the file to make sure that
* no code in this file accidentally calls it.
*/
/* Backward compatible dm_tree_node_size_changed() implementations. */
int dm_tree_node_size_changed_base(const struct dm_tree_node *dnode);
DM_EXPORT_SYMBOL_BASE(dm_tree_node_size_changed);
int dm_tree_node_size_changed_base(const struct dm_tree_node *dnode)
{
/* Base does not make difference between smaller and bigger */
return dm_tree_node_size_changed(dnode) ? 1 : 0;
}
/*
* Retain ABI compatibility after adding the DM_CACHE_FEATURE_METADATA2
* in version 1.02.138.
*
* Binaries compiled against version 1.02.138 onwards will use
* the new function dm_tree_node_add_cache_target which detects unknown
* feature flags and returns error for them.
*/
int dm_tree_node_add_cache_target_base(struct dm_tree_node *node,
uint64_t size,
uint64_t feature_flags, /* DM_CACHE_FEATURE_* */
const char *metadata_uuid,
const char *data_uuid,
const char *origin_uuid,
const char *policy_name,
const struct dm_config_node *policy_settings,
uint32_t data_block_size);
DM_EXPORT_SYMBOL_BASE(dm_tree_node_add_cache_target);
int dm_tree_node_add_cache_target_base(struct dm_tree_node *node,
uint64_t size,
uint64_t feature_flags,
const char *metadata_uuid,
const char *data_uuid,
const char *origin_uuid,
const char *policy_name,
const struct dm_config_node *policy_settings,
uint32_t data_block_size)
{
/* Old version supported only these FEATURE bits, others were ignored so masked them */
static const uint64_t _mask =
DM_CACHE_FEATURE_WRITEBACK |
DM_CACHE_FEATURE_WRITETHROUGH |
DM_CACHE_FEATURE_PASSTHROUGH;
return dm_tree_node_add_cache_target(node, size, feature_flags & _mask,
metadata_uuid, data_uuid, origin_uuid,
policy_name, policy_settings, data_block_size);
}
#endif
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