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lvm2/libdm/libdm-deptree.c
Alasdair Kergon 56c282920c Resume snapshot-origins last.
2005-11-22 20:00:35 +00:00

1730 lines
40 KiB
C
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/*
* Copyright (C) 2005 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "libdm-targets.h"
#include "libdm-common.h"
#include "list.h"
#include "kdev_t.h"
#include <stdarg.h>
#include <sys/param.h>
#include <linux/dm-ioctl.h>
#define MAX_TARGET_PARAMSIZE 500000
/* FIXME Fix interface so this is used only by LVM */
#define UUID_PREFIX "LVM-"
/* Supported segment types */
enum {
SEG_ERROR,
SEG_LINEAR,
SEG_MIRRORED,
SEG_SNAPSHOT,
SEG_SNAPSHOT_ORIGIN,
SEG_STRIPED,
SEG_ZERO,
};
/* FIXME Add crypt and multipath support */
struct {
unsigned type;
const char *target;
} dm_segtypes[] = {
{ SEG_ERROR, "error" },
{ SEG_LINEAR, "linear" },
{ SEG_MIRRORED, "mirror" },
{ SEG_SNAPSHOT, "snapshot" },
{ SEG_SNAPSHOT_ORIGIN, "snapshot-origin" },
{ SEG_STRIPED, "striped" },
{ SEG_ZERO, "zero"},
};
/* Some segment types have a list of areas of other devices attached */
struct seg_area {
struct list list;
struct dm_tree_node *dev_node;
uint64_t offset;
};
/* Per-segment properties */
struct load_segment {
struct list list;
unsigned type;
uint64_t size;
unsigned area_count; /* Linear + Striped + Mirrored */
struct list areas; /* Linear + Striped + Mirrored */
uint32_t stripe_size; /* Striped */
int persistent; /* Snapshot */
uint32_t chunk_size; /* Snapshot */
struct dm_tree_node *cow; /* Snapshot */
struct dm_tree_node *origin; /* Snapshot + Snapshot origin */
struct dm_tree_node *log; /* Mirror */
uint32_t region_size; /* Mirror */
unsigned clustered; /* Mirror */
unsigned mirror_area_count; /* Mirror */
};
/* Per-device properties */
struct load_properties {
int read_only;
uint32_t major;
uint32_t minor;
unsigned segment_count;
struct list segs;
const char *new_name;
};
/* Two of these used to join two nodes with uses and used_by. */
struct dm_tree_link {
struct 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 list uses; /* Nodes this node uses */
struct list used_by; /* Nodes that use this node */
int activation_priority; /* 0 gets activated first */
void *context; /* External supplied context */
struct load_properties props; /* For creation/table (re)load */
};
struct dm_tree {
struct dm_pool *mem;
struct dm_hash_table *devs;
struct dm_hash_table *uuids;
struct dm_tree_node root;
};
/* FIXME Consider exporting this */
static int _dm_snprintf(char *buf, size_t bufsize, const char *format, ...)
{
int n;
va_list ap;
va_start(ap, format);
n = vsnprintf(buf, bufsize, format, ap);
va_end(ap);
if (n < 0 || (n > bufsize - 1))
return -1;
return n;
}
struct dm_tree *dm_tree_create(void)
{
struct dm_tree *dtree;
if (!(dtree = dm_malloc(sizeof(*dtree)))) {
log_error("dm_tree_create malloc failed");
return NULL;
}
memset(dtree, 0, sizeof(*dtree));
dtree->root.dtree = dtree;
list_init(&dtree->root.uses);
list_init(&dtree->root.used_by);
if (!(dtree->mem = dm_pool_create("dtree", 1024))) {
log_error("dtree pool creation failed");
dm_free(dtree);
return NULL;
}
if (!(dtree->devs = dm_hash_create(8))) {
log_error("dtree hash creation failed");
dm_pool_destroy(dtree->mem);
dm_free(dtree);
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);
dm_free(dtree);
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);
dm_free(dtree);
}
static int _nodes_are_linked(struct dm_tree_node *parent,
struct dm_tree_node *child)
{
struct dm_tree_link *dlink;
list_iterate_items(dlink, &parent->uses)
if (dlink->node == child)
return 1;
return 0;
}
static int _link(struct 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;
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 list *list, struct dm_tree_node *node)
{
struct dm_tree_link *dlink;
list_iterate_items(dlink, list)
if (dlink->node == node) {
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)
{
return _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)
{
return _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)
{
struct dm_tree_node *node;
uint64_t dev;
if (!(node = dm_pool_zalloc(dtree->mem, sizeof(*node)))) {
log_error("_create_dm_tree_node alloc failed");
return NULL;
}
node->dtree = dtree;
node->name = name;
node->uuid = uuid;
node->info = *info;
node->context = context;
node->activation_priority = 0;
list_init(&node->uses);
list_init(&node->used_by);
list_init(&node->props.segs);
dev = MKDEV(info->major, 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)
{
uint64_t dev = MKDEV(major, minor);
return dm_hash_lookup_binary(dtree->devs, (const char *) &dev,
sizeof(dev));
}
static struct dm_tree_node *_find_dm_tree_node_by_uuid(struct dm_tree *dtree,
const char *uuid)
{
struct dm_tree_node *node;
if ((node = dm_hash_lookup(dtree->uuids, uuid)))
return node;
if (strncmp(uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1))
return NULL;
return dm_hash_lookup(dtree->uuids, uuid + sizeof(UUID_PREFIX) - 1);
}
static int _deps(struct dm_task **dmt, struct dm_pool *mem, uint32_t major, uint32_t minor,
const char **name, const char **uuid,
struct dm_info *info, struct dm_deps **deps)
{
memset(info, 0, sizeof(*info));
if (!dm_is_dm_major(major)) {
*name = "";
*uuid = "";
*deps = NULL;
info->major = major;
info->minor = minor;
info->exists = 0;
info->live_table = 0;
info->inactive_table = 0;
info->read_only = 0;
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 (!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;
}
if (!(*name = dm_pool_strdup(mem, dm_task_get_name(*dmt)))) {
log_error("name pool_strdup failed");
goto failed;
}
if (!(*uuid = dm_pool_strdup(mem, dm_task_get_uuid(*dmt)))) {
log_error("uuid pool_strdup failed");
goto failed;
}
*deps = dm_task_get_deps(*dmt);
}
return 1;
failed:
dm_task_destroy(*dmt);
return 0;
}
static struct dm_tree_node *_add_dev(struct dm_tree *dtree,
struct dm_tree_node *parent,
uint32_t major, uint32_t minor)
{
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, &info, &deps))
return_NULL;
if (!(node = _create_dm_tree_node(dtree, name, uuid,
&info, NULL)))
goto_out;
new = 1;
}
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->count) {
if (!_add_to_bottomlevel(node)) {
stack;
node = NULL;
}
goto out;
}
/* Add dependencies to tree */
for (i = 0; i < deps->count; i++)
if (!_add_dev(dtree, node, MAJOR(deps->device[i]),
MINOR(deps->device[i]))) {
node = NULL;
goto_out;
}
out:
if (dmt)
dm_task_destroy(dmt);
return node;
}
static int _node_clear_table(struct dm_tree_node *dnode)
{
struct dm_task *dmt;
struct dm_info *info;
const char *name;
int r;
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;
log_verbose("Clearing inactive table %s (%" PRIu32 ":%" PRIu32 ")",
name, info->major, info->minor);
if (!(dmt = dm_task_create(DM_DEVICE_CLEAR))) {
dm_task_destroy(dmt);
log_error("Table clear dm_task creation failed for %s", name);
return 0;
}
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);
dm_task_destroy(dmt);
return 0;
}
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;
}
dm_task_destroy(dmt);
return r;
}
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)
{
struct dm_tree_node *dnode;
struct dm_info info;
const char *name2;
const char *uuid2;
/* Do we need to add node to tree? */
if (!(dnode = dm_tree_find_node_by_uuid(dtree, uuid))) {
if (!(name2 = dm_pool_strdup(dtree->mem, name))) {
log_error("name pool_strdup failed");
return NULL;
}
if (!(uuid2 = dm_pool_strdup(dtree->mem, uuid))) {
log_error("uuid pool_strdup failed");
return NULL;
}
info.major = 0;
info.minor = 0;
info.exists = 0;
info.live_table = 0;
info.inactive_table = 0;
info.read_only = 0;
if (!(dnode = _create_dm_tree_node(dtree, name2, uuid2,
&info, context)))
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;
dnode->props.new_name = NULL;
} 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 0;
}
}
dnode->props.read_only = read_only ? 1 : 0;
if (clear_inactive && !_node_clear_table(dnode))
return_NULL;
dnode->context = context;
return dnode;
}
int dm_tree_add_dev(struct dm_tree *dtree, uint32_t major, uint32_t minor)
{
return _add_dev(dtree, &dtree->root, major, minor) ? 1 : 0;
}
const char *dm_tree_node_get_name(struct dm_tree_node *node)
{
return node->info.exists ? node->name : "";
}
const char *dm_tree_node_get_uuid(struct dm_tree_node *node)
{
return node->info.exists ? node->uuid : "";
}
const struct dm_info *dm_tree_node_get_info(struct dm_tree_node *node)
{
return &node->info;
}
void *dm_tree_node_get_context(struct dm_tree_node *node)
{
return node->context;
}
int dm_tree_node_num_children(struct dm_tree_node *node, uint32_t inverted)
{
if (inverted) {
if (_nodes_are_linked(&node->dtree->root, node))
return 0;
return list_size(&node->used_by);
}
if (_nodes_are_linked(node, &node->dtree->root))
return 0;
return 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)
{
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, UUID_PREFIX, sizeof(UUID_PREFIX) - 1))
return 0;
if (strncmp(uuid_prefix, UUID_PREFIX, sizeof(UUID_PREFIX) - 1))
return 0;
if (!strncmp(uuid, uuid_prefix + sizeof(UUID_PREFIX) - 1, uuid_prefix_len - (sizeof(UUID_PREFIX) - 1)))
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 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;
}
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;
if (!(dinfo = dm_tree_node_get_info(dlink->node))) {
stack; /* FIXME Is this normal? */
return 0;
}
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,
struct dm_tree_node *parent,
uint32_t inverted)
{
struct list **dlink = (struct list **) handle;
struct list *use_list;
if (inverted)
use_list = &parent->used_by;
else
use_list = &parent->uses;
if (!*dlink)
*dlink = list_first(use_list);
else
*dlink = list_next(use_list, *dlink);
return (*dlink) ? list_item(*dlink, struct dm_tree_link)->node : NULL;
}
/*
* 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_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_error("Failed to disable open_count");
if ((r = dm_task_run(dmt)))
r = dm_task_get_info(dmt, info);
dm_task_destroy(dmt);
return r;
}
static int _deactivate_node(const char *name, uint32_t major, uint32_t minor)
{
struct dm_task *dmt;
int r;
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);
dm_task_destroy(dmt);
return 0;
}
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
r = dm_task_run(dmt);
/* FIXME Until kernel returns actual name so dm-ioctl.c can handle it */
rm_dev_node(name);
/* FIXME Remove node from tree or mark invalid? */
dm_task_destroy(dmt);
return r;
}
static int _rename_node(const char *old_name, const char *new_name, uint32_t major, uint32_t minor)
{
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_error("Failed to disable open_count");
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,
struct dm_info *newinfo)
{
struct dm_task *dmt;
int r;
log_verbose("Resuming %s (%" PRIu32 ":%" PRIu32 ")", name, major, minor);
if (!(dmt = dm_task_create(DM_DEVICE_RESUME))) {
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 resumption.", name);
dm_task_destroy(dmt);
return 0;
}
if (!dm_task_no_open_count(dmt))
log_error("Failed to disable open_count");
if ((r = dm_task_run(dmt)))
r = dm_task_get_info(dmt, newinfo);
dm_task_destroy(dmt);
return r;
}
static int _suspend_node(const char *name, uint32_t major, uint32_t minor,
struct dm_info *newinfo)
{
struct dm_task *dmt;
int r;
log_verbose("Suspending %s (%" PRIu32 ":%" PRIu32 ")", name, major, minor);
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_error("Failed to disable open_count");
if ((r = dm_task_run(dmt)))
r = dm_task_get_info(dmt, newinfo);
dm_task_destroy(dmt);
return r;
}
int dm_tree_deactivate_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
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) ||
!info.exists || info.open_count)
continue;
if (!_deactivate_node(name, info.major, info.minor)) {
log_error("Unable to deactivate %s (%" PRIu32
":%" PRIu32 ")", name, info.major,
info.minor);
continue;
}
if (dm_tree_node_num_children(child, 0))
dm_tree_deactivate_children(child, uuid_prefix, uuid_prefix_len);
}
return 1;
}
int dm_tree_suspend_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
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) ||
!info.exists)
continue;
if (!_suspend_node(name, info.major, info.minor, &newinfo)) {
log_error("Unable to suspend %s (%" PRIu32
":%" PRIu32 ")", name, info.major,
info.minor);
continue;
}
/* Update cached info */
child->info = newinfo;
}
/* Then suspend any child nodes */
handle = NULL;
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
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))
dm_tree_suspend_children(child, uuid_prefix, uuid_prefix_len);
}
return 1;
}
int dm_tree_activate_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
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))
dm_tree_activate_children(child, uuid_prefix, uuid_prefix_len);
}
handle = NULL;
for (priority = 0; priority < 2; priority++) {
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 (priority != child->activation_priority)
continue;
if (!(name = dm_tree_node_get_name(child))) {
stack;
continue;
}
/* Rename? */
if (child->props.new_name) {
if (!_rename_node(name, child->props.new_name, child->info.major, child->info.minor)) {
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(name, child->info.major, child->info.minor, &newinfo)) {
log_error("Unable to resume %s (%" PRIu32
":%" PRIu32 ")", name, child->info.major,
child->info.minor);
continue;
}
/* Update cached info */
child->info = newinfo;
}
}
handle = NULL;
return 1;
}
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_error("Failed to disable open_count");
if ((r = dm_task_run(dmt)))
r = dm_task_get_info(dmt, &dnode->info);
out:
dm_task_destroy(dmt);
return r;
}
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;
}
static int _emit_areas_line(struct dm_task *dmt, struct load_segment *seg, char *params, size_t paramsize, int *pos)
{
struct seg_area *area;
char devbuf[10];
int tw;
const char *prefix = "";
list_iterate_items(area, &seg->areas) {
if (!_build_dev_string(devbuf, sizeof(devbuf), area->dev_node))
return_0;
if ((tw = _dm_snprintf(params + *pos, paramsize - *pos, "%s%s %" PRIu64,
prefix, devbuf, area->offset)) < 0) {
stack; /* Out of space */
return -1;
}
prefix = " ";
*pos += tw;
}
return 1;
}
static int _emit_segment_line(struct dm_task *dmt, struct load_segment *seg, uint64_t *seg_start, char *params, size_t paramsize)
{
int pos = 0;
int tw;
int r;
char originbuf[10], cowbuf[10], logbuf[10];
switch(seg->type) {
case SEG_ERROR:
case SEG_ZERO:
params[0] = '\0';
case SEG_LINEAR:
break;
case SEG_MIRRORED:
if (seg->clustered) {
if ((tw = _dm_snprintf(params + pos, paramsize - pos, "clustered ")) < 0) {
stack; /* Out of space */
return -1;
}
pos += tw;
}
if (!seg->log) {
if ((tw = _dm_snprintf(params + pos, paramsize - pos, "core 1 ")) < 0) {
stack; /* Out of space */
return -1;
}
pos += tw;
} else {
if (!_build_dev_string(logbuf, sizeof(logbuf), seg->log))
return_0;
if ((tw = _dm_snprintf(params + pos, paramsize - pos, "disk 2 %s ", logbuf)) < 0) {
stack; /* Out of space */
return -1;
}
pos += tw;
}
if ((tw = _dm_snprintf(params + pos, paramsize - pos, "%u %u ", seg->region_size, seg->mirror_area_count)) < 0) {
stack; /* Out of space */
return -1;
}
pos += tw;
break;
case SEG_SNAPSHOT:
if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
return_0;
if (!_build_dev_string(cowbuf, sizeof(cowbuf), seg->cow))
return_0;
if ((pos = _dm_snprintf(params, paramsize, "%s %s %c %d",
originbuf, cowbuf,
seg->persistent ? 'P' : 'N',
seg->chunk_size)) < 0) {
stack; /* Out of space */
return -1;
}
break;
case SEG_SNAPSHOT_ORIGIN:
if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
return_0;
if ((pos = _dm_snprintf(params, paramsize, "%s",
originbuf)) < 0) {
stack; /* Out of space */
return -1;
}
break;
case SEG_STRIPED:
if ((pos = _dm_snprintf(params, paramsize, "%u %u ",
seg->area_count,
seg->stripe_size)) < 0) {
stack; /* Out of space */
return -1;
}
break;
}
switch(seg->type) {
case SEG_ERROR:
case SEG_SNAPSHOT:
case SEG_SNAPSHOT_ORIGIN:
case SEG_ZERO:
break;
case SEG_LINEAR:
case SEG_MIRRORED:
case SEG_STRIPED:
if ((r = _emit_areas_line(dmt, seg, params, paramsize, &pos)) <= 0) {
stack;
return r;
}
break;
}
log_debug("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
*seg_start, seg->size, dm_segtypes[seg->type].target, params);
if (!dm_task_add_target(dmt, *seg_start, seg->size, dm_segtypes[seg->type].target, params))
return_0;
*seg_start += seg->size;
return 1;
}
static int _emit_segment(struct dm_task *dmt, struct load_segment *seg,
uint64_t *seg_start)
{
char *params;
size_t paramsize = 4096;
int ret;
do {
if (!(params = dm_malloc(paramsize))) {
log_error("Insufficient space for target parameters.");
return 0;
}
ret = _emit_segment_line(dmt, seg, seg_start, params, paramsize);
dm_free(params);
if (!ret)
stack;
if (ret >= 0)
return ret;
log_debug("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;
log_verbose("Loading %s table", dnode->name);
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");
list_iterate_items(seg, &dnode->props.segs)
if (!_emit_segment(dmt, 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 identical table reload.",
dnode->name);
}
dnode->props.segment_count = 0;
out:
dm_task_destroy(dmt);
return r;
}
int dm_tree_preload_children(struct dm_tree_node *dnode,
const char *uuid_prefix,
size_t uuid_prefix_len)
{
void *handle = NULL;
struct dm_tree_node *child;
struct dm_info newinfo;
const char *name;
/* Preload children first */
while ((child = dm_tree_next_child(&handle, dnode, 0))) {
/* 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))
dm_tree_preload_children(child, uuid_prefix, uuid_prefix_len);
if (!(name = dm_tree_node_get_name(child))) {
stack;
continue;
}
/* FIXME Cope if name exists with no uuid? */
if (!child->info.exists) {
if (!_create_node(child)) {
stack;
return 0;
}
}
if (!child->info.inactive_table && child->props.segment_count) {
if (!_load_node(child)) {
stack;
return 0;
}
}
/* Resume device immediately if it has parents */
if (!dm_tree_node_num_children(child, 1))
continue;
if (!child->info.inactive_table && !child->info.suspended)
continue;
if (!_resume_node(name, child->info.major, child->info.minor, &newinfo)) {
log_error("Unable to resume %s (%" PRIu32
":%" PRIu32 ")", name, child->info.major,
child->info.minor);
continue;
}
/* Update cached info */
child->info = newinfo;
}
handle = NULL;
return 1;
}
/*
* 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;
seg->area_count = 0;
list_init(&seg->areas);
seg->stripe_size = 0;
seg->persistent = 0;
seg->chunk_size = 0;
seg->cow = NULL;
seg->origin = NULL;
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;
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)
{
struct load_segment *seg;
struct dm_tree_node *origin_node, *cow_node;
if (!(seg = _add_segment(node, SEG_SNAPSHOT, 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 origin 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;
return 1;
}
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_mirror_target_log(struct dm_tree_node *node,
uint32_t region_size,
unsigned clustered,
const char *log_uuid,
unsigned area_count)
{
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 = list_item(list_last(&node->props.segs), struct load_segment);
if (log_uuid) {
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 (!_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;
return 1;
}
int dm_tree_node_add_mirror_target(struct dm_tree_node *node,
uint64_t size)
{
struct load_segment *seg;
if (!(seg = _add_segment(node, SEG_MIRRORED, size)))
return_0;
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;
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))))
return_0;
}
if (!node->props.segment_count) {
log_error("Internal error: Attempt to add target area to missing segment.");
return 0;
}
seg = list_item(list_last(&node->props.segs), struct load_segment);
if (!_add_area(node, seg, dev_node, offset))
return_0;
return 1;
}
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