/* * 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 "libdm/misc/dmlib.h" #include "libdm-targets.h" #include "libdm-common.h" #include "libdm/misc/kdev_t.h" #include "libdm/misc/dm-ioctl.h" #include #include #define MAX_TARGET_PARAMSIZE 500000 /* Supported segment types */ enum { SEG_CACHE, SEG_CRYPT, SEG_ERROR, SEG_LINEAR, SEG_MIRRORED, 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_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; }; 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; }; /* Per-segment properties */ struct load_segment { struct dm_list list; unsigned type; uint64_t size; unsigned area_count; /* Linear + Striped + Mirrored + Crypt */ struct dm_list areas; /* Linear + Striped + Mirrored + Crypt */ 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 */ 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 */ 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 */ uint32_t migration_threshold; /* 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; /* * Preload tree normally only loads and not resume, but there is * automatic resume when target is extended, as it's believed * there can be no i/o flying to this 'new' extedend space * from any device above. Reason is that preloaded target above * may actually need to see its bigger subdevice before it * gets suspended. As long as devices are simple linears * there is no problem to resume bigger device in preload (before commit). * However complex targets like thin-pool (raid,cache...) * they shall not be resumed before their commit. */ unsigned delay_resume_if_extended; /* * 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; /* Suspend and Resume siblings after node activation with udev flags*/ unsigned reactivate_siblings; uint16_t reactivate_udev_flags; }; /* 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; int activated; /* tracks activation during preload */ }; 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); 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->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 && !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(major, 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 = strrchr(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 (" FMTu32 ":" FMTu32 ")", dnode->name ? 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) { if (udev_flags != dnode->udev_flags) log_debug_activation("Resetting %s udev_flags from 0x%x to 0x%x.", _node_name(dnode), 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)); *name = ""; *uuid = ""; *deps = NULL; if (!dm_is_dm_major(major)) { info->major = major; info->minor = minor; return 1; } if (!(*dmt = dm_task_create(DM_DEVICE_DEPS))) return_0; if (!dm_task_set_major(*dmt, major) || !dm_task_set_minor(*dmt, minor)) { log_error("_deps: failed to set major:minor for (" FMTu32 ":" FMTu32 ").", 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) { 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); *dmt = NULL; 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 = 0; if (!(dmt = dm_task_create(DM_DEVICE_INFO))) 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."); goto out; } if (!with_open_count && !dm_task_no_open_count(dmt)) log_warn("WARNING: Failed to disable open_count."); if (!dm_task_run(dmt)) goto_out; if (!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"); goto out; } if (uuid && !(*uuid = dm_pool_strdup(mem, dm_task_get_uuid(dmt)))) { log_error("uuid pool_strdup failed"); goto out; } r = 1; out: dm_task_destroy(dmt); return r; } static int _check_device_not_in_use(const char *name, struct dm_info *info) { const char *reason; if (!info->exists) return 1; /* If sysfs is not used, use open_count information only. */ if (!*dm_sysfs_dir()) { if (!info->open_count) return 1; reason = "in use"; } else if (dm_device_has_holders(info->major, info->minor)) reason = "is used by another device"; else if (dm_device_has_mounted_fs(info->major, info->minor)) reason = "constains a filesystem in use"; else return 1; log_error("Device %s (" FMTu32 ":" FMTu32 ") %s.", name, info->major, info->minor, reason); return 0; } /* 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 = &dnode->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 (!(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 (" FMTu32 ":" FMTu32 ").", 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 = 0; 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); goto out; } 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); } out: 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, ¶ms); if (!type || (strcmp(type, "thin-pool") != 0)) { log_error("Expected thin-pool target for %s and got %s.", _node_name(dnode), type ? : "no target"); 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 _node_message(uint32_t major, uint32_t minor, int expected_errno, const char *message) { struct dm_task *dmt; int r = 0; if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG))) return_0; if (!dm_task_set_major(dmt, major) || !dm_task_set_minor(dmt, minor)) { log_error("Failed to set message major minor."); goto out; } if (!dm_task_set_message(dmt, message)) goto_out; /* Internal functionality of dm_task */ dmt->expected_errno = expected_errno; if (!dm_task_run(dmt)) { log_error("Failed to process message \"%s\".", message); goto out; } 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_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; } if (!_node_message(dnode->info.major, dnode->info.minor, tm->expected_errno, buf)) { switch (m->type) { case DM_THIN_MESSAGE_CREATE_SNAP: case DM_THIN_MESSAGE_CREATE_THIN: if (errno == EEXIST) { /* * ATM errno from ioctl() is preserved through code error path chain * If this would ever change, another way need to be used to * obtain result from failed DM message */ log_error("Thin pool %s already contain thin device with device_id %u.", _node_name(dnode), m->u.m_create_snap.device_id); /* * TODO: * * Give some useful advice how to solve this problem, * until lvconvert --repair can handle this automatically */ log_error("Manual intervention may be required to remove device dev_id=%u in thin pool metadata.", m->u.m_create_snap.device_id); log_error("Optionally new thin volume with device_id=%u can be manually added into a volume group.", m->u.m_create_snap.device_id); log_warn("WARNING: When uncertain how to do this, contact support!"); return 0; } /* fall through */ default: return_0; } } return 1; } static struct load_segment *_get_last_load_segment(struct dm_tree_node *node) { if (dm_list_empty(&node->props.segs)) { log_error("Node %s is missing a segment.", _node_name(node)); return NULL; } return dm_list_item(dm_list_last(&node->props.segs), struct load_segment); } /* 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; const char *uuid; int have_messages; if (!dnode->info.exists) return 1; if (!(seg = _get_last_load_segment(dnode))) return_0; 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 */ if (stp.fail || stp.read_only || stp.needs_check) { log_error("Cannot send messages to thin pool %s%s%s%s.", _node_name(dnode), stp.fail ? " in failed state" : "", stp.read_only ? " with read only metadata" : "", stp.needs_check ? " which needs check first" : ""); return 0; } 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 (" FMTu32 ":" FMTu32 ").", 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 (" FMTu32 ":" FMTu32 ").", 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 (" FMTu32 ":" FMTu32 ").", 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 (" FMTu32 ":" FMTu32 ")", 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; } /* * Reactivation of sibling nodes * * Function is used when activating origin and its thick snapshots * to ensure udev is processing first the origin LV and all the * snapshot LVs are processed afterwards. */ static int _reactivate_siblings(struct dm_tree_node *dnode, const char *uuid_prefix, size_t uuid_prefix_len) { struct dm_tree_node *child; const char *uuid; void *handle = NULL; int r = 1; /* Wait for udev before reactivating siblings */ if (!dm_udev_wait(dm_tree_get_cookie(dnode))) stack; dm_tree_set_cookie(dnode, 0); while ((child = dm_tree_next_child(&handle, dnode, 0))) { if (child->props.reactivate_siblings) { /* Skip 'leading' device in this group, marked with flag */ child->props.reactivate_siblings = 0; continue; } if (!(uuid = dm_tree_node_get_uuid(child))) { stack; continue; } if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len)) continue; if (!_suspend_node(child->name, child->info.major, child->info.minor, child->dtree->skip_lockfs, child->dtree->no_flush, &child->info)) { log_error("Unable to suspend %s (" FMTu32 ":" FMTu32 ")", child->name, child->info.major, child->info.minor); r = 0; continue; } if (!_resume_node(child->name, child->info.major, child->info.minor, child->props.read_ahead, child->props.read_ahead_flags, &child->info, &child->dtree->cookie, child->props.reactivate_udev_flags, // use these flags child->info.suspended)) { log_error("Failed to suspend %s (" FMTu32 ":" FMTu32 ")", child->name, child->info.major, child->info.minor); r = 0; continue; } } return r; } 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; 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, &child->info, &child->dtree->cookie, child->udev_flags, child->info.suspended)) { log_error("Unable to resume %s.", _node_name(child)); r = 0; continue; } /* * 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 && (child->props.send_messages > 1) && !(r = _node_send_messages(child, uuid_prefix, uuid_prefix_len, 1))) stack; /* Reactivate only for fresh activated origin */ if (r && child->props.reactivate_siblings && (!(r = _reactivate_siblings(dnode, uuid_prefix, uuid_prefix_len)))) stack; } if (awaiting_peer_rename) priority--; /* redo priority level */ } return r; } static int _create_node(struct dm_tree_node *dnode, struct dm_tree_node *parent) { 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); } if (r) dnode->activated = 1; 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; } /* 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; dm_list_iterate_items(area, &seg->areas) { switch (seg->type) { 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; } /* * 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; unsigned log_parm_count; int pos = 0; char logbuf[DM_FORMAT_DEV_BUFSIZE]; const char *logtype; unsigned kmaj = 0, kmin = 0, krel = 0; if (!get_uname_version(&kmaj, &kmin, &krel)) 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)) 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)) 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); /* Do not pass migration_threshold 2048 which is default */ EMIT_PARAMS(pos, " %u", (seg->policy_argc + ((seg->migration_threshold != 2048) ? 1 : 0)) * 2); if (seg->migration_threshold != 2048) EMIT_PARAMS(pos, " migration_threshold %u", seg->migration_threshold); if (seg->policy_settings) for (cn = seg->policy_settings->child; cn; cn = cn->sib) if (cn->v) /* Skip deleted entry */ 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 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 */ if (!_mirror_emit_segment_line(dmt, seg, params, paramsize)) return_0; 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; if (!_raid_emit_segment_line(dmt, major, minor, seg, seg_start, params, paramsize)) 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_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_STRIPED: if (!_emit_areas_line(dmt, seg, params, paramsize, &pos)) return_0; 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 table for %s.", _node_name(dnode)); if (!(dmt = dm_task_create(DM_DEVICE_RELOAD))) { log_error("Reload dm_task creation failed for %s.", _node_name(dnode)); 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.", _node_name(dnode)); goto out; } if (dnode->props.read_only && !dm_task_set_ro(dmt)) { log_error("Failed to set read only flag for %s.", _node_name(dnode)); goto out; } if (!dm_task_no_open_count(dmt)) log_warn("WARNING: 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_warn("WARNING: 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.", _node_name(dnode)); 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.%s", existing_table_size, seg_start, _node_name(dnode), dnode->props.size_changed ? "" : " (Ignoring.)"); /* * FIXME: code here has known design problem. * LVM2 does NOT resize thin-pool on top of other LV in 2 steps - * where raid would be resized with 1st. transaction * followed by 2nd. thin-pool resize - RHBZ #1285063 */ if (existing_table_size && dnode->props.delay_resume_if_extended) { log_debug_activation("Resume of table of extended device %s delayed.", _node_name(dnode)); dnode->props.size_changed = 0; } } } dnode->props.segment_count = 0; out: dm_task_destroy(dmt); return r; } /* Try to deactivate only nodes created during preload. */ static int _dm_tree_revert_activated(struct dm_tree_node *dnode) { void *handle = NULL; struct dm_tree_node *child; while ((child = dm_tree_next_child(&handle, dnode, 0))) { if (child->activated) { if (child->callback) { log_debug_activation("Dropping callback for %s.", _node_name(child)); child->callback = NULL; } log_debug_activation("Reverting %s.", _node_name(child)); if (!_deactivate_node(child->name, child->info.major, child->info.minor, &child->dtree->cookie, child->udev_flags, 0)) { log_debug_activation("Unable to deactivate %s.", _node_name(child)); return 0; } } if (dm_tree_node_num_children(child, 0) && !_dm_tree_revert_activated(child)) return_0; } return 1; } static int _dm_tree_wait_and_revert_activated(struct dm_tree_node *dnode) { if (!dm_udev_wait(dm_tree_get_cookie(dnode))) stack; dm_tree_set_cookie(dnode, 0); return _dm_tree_revert_activated(dnode); } 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; int update_devs_flag = 0; /* 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, dnode))) return_0; /* Propagate delayed resume from exteded child node */ if (child->props.delay_resume_if_extended) dnode->props.delay_resume_if_extended = 1; if (!child->info.inactive_table && child->props.segment_count && !_load_node(child)) { stack; /* * If the table load fails, try to device in the kernel * together with other created and preloaded devices. */ if (!_dm_tree_wait_and_revert_activated(dnode)) stack; r = 0; continue; } /* 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 (!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, &child->info, &child->dtree->cookie, child->udev_flags, child->info.suspended)) { log_error("Unable to resume %s.", _node_name(child)); if (!_dm_tree_wait_and_revert_activated(dnode)) stack; r = 0; continue; } if (node_created) { /* 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_tree_wait_and_revert_activated(dnode)) stack; r = 0; continue; } } /* * 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_warn("WARNING: Failed to get uuid for dtree node %s.", _node_name(child)); 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; if (!dnode->info.exists) /* Reactivate siblings for this origin after being resumed */ dnode->props.reactivate_siblings = 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; } } else if (!origin_node->info.exists) { /* Keep original udev_flags for reactivation. */ node->props.reactivate_udev_flags = node->udev_flags; /* Reactivation is needed if the origin's -real device is not in DM table. * For this case after the resume of its origin LV we resume its snapshots * with updated udev_flags to completely avoid udev scanning for the first resume. * Reactivation then resumes snapshots with original udev_flags. */ node->udev_flags |= DM_SUBSYSTEM_UDEV_FLAG0 | DM_UDEV_DISABLE_DISK_RULES_FLAG | DM_UDEV_DISABLE_OTHER_RULES_FLAG; log_debug_activation("Using udev_flags 0x%x for activation of %s.", node->udev_flags, node->name); } 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 (!(seg = _get_last_load_segment(node))) return_0; 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, ¶ms); } /* * 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; } DM_EXPORT_NEW_SYMBOL(int, dm_tree_node_add_cache_target, 1_02_138) (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; seg->migration_threshold = 2048; /* Default migration threshold 1MiB */ /* 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 = pairs are supported */ log_error("Cache policy parameter %s is without integer value.", cn->key); return 0; } if (strcmp(cn->key, "migration_threshold") == 0) { seg->migration_threshold = cn->v->v.i; cn->v = NULL; /* skip this entry */ } else seg->policy_argc++; } } /* Always some throughput available for cache to proceed */ if (seg->migration_threshold < data_block_size * 8) seg->migration_threshold = data_block_size * 8; 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) { log_error("Replicator segment is unsupported."); return 0; } /* 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) { log_error("Replicator targer is unsupported."); return 0; } static struct load_segment *_get_single_load_segment(struct dm_tree_node *node, unsigned type) { struct load_segment *seg; if (!(seg = _get_last_load_segment(node))) return_NULL; /* Never used past _load_node(), so can test segment_count */ if (node->props.segment_count != 1) { log_error("Node %s must have only one segment.", _dm_segtypes[type].target); return NULL; } 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) { return dm_tree_node_add_thin_pool_target_v1(node, size, transaction_id, metadata_uuid, pool_uuid, data_block_size, low_water_mark, skip_block_zeroing, 1); } int dm_tree_node_add_thin_pool_target_v1(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, unsigned crop_metadata) { 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; if (crop_metadata) /* 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; /* Preload must not resume extended running thin-pool before it's committed */ node->props.delay_resume_if_extended = 1; /* 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 (!(seg = _get_last_load_segment(node))) return_0; 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; if (!(seg = _get_last_load_segment(node))) return_0; 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(GNU_SYMVER) /* * 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. */ DM_EXPORT_SYMBOL_BASE(dm_tree_node_size_changed) int dm_tree_node_size_changed_base(const struct dm_tree_node *dnode); 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. */ 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, /* 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); 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