diff options
author | David Teigland <teigland@redhat.com> | 2016-05-25 13:57:33 -0500 |
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committer | David Teigland <teigland@redhat.com> | 2016-05-25 13:57:33 -0500 |
commit | 34509ff7b62802b43c8cbadf332ffad2911007f4 (patch) | |
tree | ab9c2eab5125bbf85c14cc53033923389ab00df8 | |
parent | bee7c36f6263aae1afc9e1473499aaf605413c70 (diff) | |
download | lvm2-dev-dct-vgimportclone-3.tar.gz |
vgimportclone: add native commanddev-dct-vgimportclone-3
to replace the previous script.
-rw-r--r-- | tools/Makefile.in | 1 | ||||
-rw-r--r-- | tools/args.h | 2 | ||||
-rw-r--r-- | tools/commands.h | 15 | ||||
-rw-r--r-- | tools/vgimportclone.c | 341 |
4 files changed, 359 insertions, 0 deletions
diff --git a/tools/Makefile.in b/tools/Makefile.in index f2f9faa56..9be8b7cd9 100644 --- a/tools/Makefile.in +++ b/tools/Makefile.in @@ -60,6 +60,7 @@ SOURCES =\ vgmerge.c \ vgmknodes.c \ lvpoll.c \ + vgimportclone.c \ vgreduce.c \ vgremove.c \ vgrename.c \ diff --git a/tools/args.h b/tools/args.h index 8fcaee8b0..443df0127 100644 --- a/tools/args.h +++ b/tools/args.h @@ -153,6 +153,7 @@ arg(autobackup_ARG, 'A', "autobackup", yes_no_arg, 0) arg(activevolumegroups_ARG, 'A', "activevolumegroups", NULL, 0) arg(background_ARG, 'b', "background", NULL, 0) arg(backgroundfork_ARG, 'b', "background", NULL, 0) +arg(basevgname_ARG, 'n', "basevgname", string_arg, 0) arg(blockdevice_ARG, 'b', "blockdevice", NULL, 0) arg(chunksize_ARG, 'c', "chunksize", size_kb_arg, 0) arg(clustered_ARG, 'c', "clustered", yes_no_arg, 0) @@ -169,6 +170,7 @@ arg(help_ARG, 'h', "help", NULL, 0) arg(cache_ARG, 'H', "cache", NULL, 0) arg(history_ARG, 'H', "history", NULL, 0) arg(help2_ARG, '?', "", NULL, 0) +arg(import_ARG, 'i', "import", NULL, 0) arg(interval_ARG, 'i', "interval", int_arg, 0) arg(iop_version_ARG, 'i', "iop_version", NULL, 0) arg(stripes_ARG, 'i', "stripes", int_arg, 0) diff --git a/tools/commands.h b/tools/commands.h index bf3e7ac67..7f6cef582 100644 --- a/tools/commands.h +++ b/tools/commands.h @@ -1260,6 +1260,21 @@ xx(vgimport, all_ARG, force_ARG, select_ARG, test_ARG) +xx(vgimportclone, + "Import a VG from cloned PVs", + 0, + "vgimportclone\n" + "\t[-d|--debug]\n" + "\t[-h|--help]\n" + "\t[-i|--import]\n" + "\t[-n|--basevgname]\n" + "\t[-t|--test]\n" + "\t[-v|--verbose]\n" + "\t[--version]\n" + "\t[PhysicalVolumePath...]\n", + + basevgname_ARG, test_ARG, import_ARG) + xx(vgmerge, "Merge volume groups", 0, diff --git a/tools/vgimportclone.c b/tools/vgimportclone.c new file mode 100644 index 000000000..2f9a69cd0 --- /dev/null +++ b/tools/vgimportclone.c @@ -0,0 +1,341 @@ +/* + * Copyright (C) 2016 Red Hat, Inc. All rights reserved. + * + * This file is part of LVM2. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU Lesser General Public License v.2.1. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "tools.h" +#include "lvmcache.h" +#include "lvmetad-client.h" +#include "filter.h" + +struct vgimportclone_params { + unsigned done; + unsigned total; + + int import_vg; + int found_args; + struct dm_list arg_import; + const char *base_vgname; + const char *old_vgname; + const char *new_vgname; +}; + +struct vgimportclone_device { + struct dm_list list; + struct device *dev; + unsigned found_in_vg : 1; +}; + +static int _vgimportclone_pv_single(struct cmd_context *cmd, struct volume_group *vg, + struct physical_volume *pv, struct processing_handle *handle) +{ + struct vgimportclone_params *vp = (struct vgimportclone_params *) handle->custom_handle; + struct vgimportclone_device *vd; + + if (vg && is_orphan_vg(vg->name)) { + log_error("Cannot import clone of orphan PV %s.", dev_name(pv->dev)); + return ECMD_FAILED; + } + + if (!(vd = dm_pool_zalloc(cmd->mem, sizeof(*vd)))) { + log_error("alloc failed."); + return ECMD_FAILED; + } + + vd->dev = pv->dev; + dm_list_add(&vp->arg_import, &vd->list); + + log_debug("vgimportclone dev %s VG %s found to import", + dev_name(vd->dev), vg ? vg->name : "<none>"); + + vp->found_args++; + + return ECMD_PROCESSED; +} + +static int _vgimportclone_vg_single(struct cmd_context *cmd, const char *vg_name, + struct volume_group *vg, struct processing_handle *handle) +{ + char uuid[64] __attribute__((aligned(8))); + struct vgimportclone_params *vp = (struct vgimportclone_params *) handle->custom_handle; + struct vgimportclone_device *vd; + struct pv_list *pvl, *new_pvl; + struct lv_list *lvl; + int devs_used_for_lv = 0; + int found; + + if (vg_is_exported(vg) && !vp->import_vg) { + log_error("VG %s is exported, use the --import option.", vg->name); + goto_bad; + } + + if (vg_status(vg) & PARTIAL_VG) { + log_error("VG %s is partial, it must be complete.", vg->name); + goto_bad; + } + + /* + * N.B. lvs_in_vg_activated() is not smart enough to distinguish + * between LVs that are active in the original VG vs the cloned VG + * that's being imported, so check DEV_USED_FOR_LV. + */ + dm_list_iterate_items(pvl, &vg->pvs) { + if (pvl->pv->dev->flags & DEV_USED_FOR_LV) { + log_error("Device %s has active LVs, deactivate first.", dev_name(pvl->pv->dev)); + devs_used_for_lv++; + } + } + + if (devs_used_for_lv) + goto_bad; + + /* + * The arg_import list must match the PVs in VG. + */ + + dm_list_iterate_items(pvl, &vg->pvs) { + found = 0; + + dm_list_iterate_items(vd, &vp->arg_import) { + if (pvl->pv->dev != vd->dev) + continue; + vd->found_in_vg = 1; + found = 1; + break; + } + + if (!found) { + if (!id_write_format(&pvl->pv->id, uuid, sizeof(uuid))) + goto_bad; + + /* all PVs in the VG must be imported together, pvl is missing from args. */ + log_error("PV with UUID %s is part of VG %s, but is not included in the devices to import.", + uuid, vg->name); + log_error("All PVs in the VG must be imported together."); + goto_bad; + } + } + + dm_list_iterate_items(vd, &vp->arg_import) { + if (!vd->found_in_vg) { + /* device arg is not in the VG. */ + log_error("Device %s was not found in VG %s.", dev_name(vd->dev), vg->name); + log_error("The devices to import must match the devices in the VG."); + goto_bad; + } + } + + /* + * Write changes. + */ + + if (!archive(vg)) + return_ECMD_FAILED; + + if (vp->import_vg) + vg->status &= ~EXPORTED_VG; + + if (!id_create(&vg->id)) + goto_bad; + + /* Low level vg_write code needs old_name to be set! */ + vg->old_name = vg->name; + + if (!(vg->name = dm_pool_strdup(vg->vgmem, vp->new_vgname))) + goto_bad; + + dm_list_iterate_items(pvl, &vg->pvs) { + if (!(new_pvl = dm_pool_zalloc(vg->vgmem, sizeof(*new_pvl)))) + goto_bad; + + new_pvl->pv = pvl->pv; + + if (!(pvl->pv->vg_name = dm_pool_strdup(vg->vgmem, vp->new_vgname))) + goto_bad; + + if (vp->import_vg) + new_pvl->pv->status &= ~EXPORTED_VG; + + /* Low level pv_write code needs old_id to be set! */ + memcpy(&new_pvl->pv->old_id, &new_pvl->pv->id, sizeof(new_pvl->pv->id)); + + if (!id_create(&new_pvl->pv->id)) + goto_bad; + + dm_list_add(&vg->pv_write_list, &new_pvl->list); + } + + dm_list_iterate_items(lvl, &vg->lvs) + memcpy(&lvl->lv->lvid, &vg->id, sizeof(vg->id)); + + if (!vg_write(vg) || !vg_commit(vg)) + goto_bad; + + return ECMD_PROCESSED; +bad: + return ECMD_FAILED; +} + +int vgimportclone(struct cmd_context *cmd, int argc, char **argv) +{ + struct vgimportclone_params vp = { 0 }; + struct processing_handle *handle = NULL; + struct dm_list vgnameids_on_system; /* vgnameid_list */ + struct vgnameid_list *vgnl; + struct vgimportclone_device *vd; + struct lvmcache_info *info; + const char *vgname; + char base_vgname[NAME_LEN] = { 0 }; + char tmp_vgname[NAME_LEN] = { 0 }; + unsigned int vgname_count; + int ret = ECMD_FAILED; + + if (!argc) { + log_error("PV names required."); + return EINVALID_CMD_LINE; + } + + dm_list_init(&vgnameids_on_system); + dm_list_init(&vp.arg_import); + + set_pv_notify(cmd); + + vp.import_vg = arg_is_set(cmd, import_ARG); + + if (!(handle = init_processing_handle(cmd))) { + log_error("Failed to initialize processing handle."); + return ECMD_FAILED; + } + handle->custom_handle = &vp; + + if (!lock_vol(cmd, VG_GLOBAL, LCK_VG_WRITE, NULL)) { + log_error("Unable to obtain global lock."); + destroy_processing_handle(cmd, handle); + return ECMD_FAILED; + } + + if (!lockd_gl(cmd, "ex", 0)) + goto_out; + cmd->lockd_gl_disable = 1; + + lvmetad_set_disabled(cmd, LVMETAD_DISABLE_REASON_DUPLICATES); + lvmetad_make_unused(cmd); + + /* + * Find the devices being imported which are named on the command line. + * They may be in the list of unchosen duplicates. + */ + + log_debug("Finding devices to import."); + cmd->command->flags |= ENABLE_DUPLICATE_DEVS; + process_each_pv(cmd, argc, argv, NULL, 0, READ_ALLOW_EXPORTED, handle, _vgimportclone_pv_single); + + if (vp.found_args != argc) { + log_error("Failed to find all devices."); + goto_out; + } + + /* + * Find the VG name of the PVs being imported, save as old_vgname. + * N.B. If vd->dev is a duplicate, then it may not match info->dev. + */ + + dm_list_iterate_items(vd, &vp.arg_import) { + if (!(info = lvmcache_info_from_pvid(vd->dev->pvid, 0))) { + log_error("Failed to find PVID for device %s in lvmcache.", dev_name(vd->dev)); + goto_out; + } + + if (!(vgname = lvmcache_vgname_from_info(info))) { + log_error("Failed to find VG name for device %s in lvmcache.", dev_name(vd->dev)); + goto_out; + } + + if (!vp.old_vgname) { + if (!(vp.old_vgname = dm_pool_strdup(cmd->mem, vgname))) + goto_out; + } else { + if (strcmp(vp.old_vgname, vgname)) { + log_error("Devices must be from the same VG."); + goto_out; + } + } + } + + /* + * Pick a new VG name, save as new_vgname. The new name begins with + * the basevgname or old_vgname, plus a $i suffix, if necessary, to + * make it unique. This requires comparing the old_vgname with all the + * VG names on the system. + */ + + if (arg_is_set(cmd, basevgname_ARG)) { + snprintf(base_vgname, sizeof(base_vgname) - 1, "%s", arg_str_value(cmd, basevgname_ARG, "")); + memcpy(tmp_vgname, base_vgname, NAME_LEN); + vgname_count = 0; + } else { + snprintf(base_vgname, sizeof(base_vgname) - 1, "%s", vp.old_vgname); + snprintf(tmp_vgname, sizeof(tmp_vgname) - 1, "%s1", vp.old_vgname); + vgname_count = 1; + } + + if (!get_vgnameids(cmd, &vgnameids_on_system, NULL, 0)) + goto_out; + +retry_name: + dm_list_iterate_items(vgnl, &vgnameids_on_system) { + if (!strcmp(vgnl->vg_name, tmp_vgname)) { + vgname_count++; + snprintf(tmp_vgname, sizeof(tmp_vgname) - 1, "%s%u", base_vgname, vgname_count); + goto retry_name; + } + } + + if (!(vp.new_vgname = dm_pool_strdup(cmd->mem, tmp_vgname))) + goto_out; + log_debug("Using new VG name %s.", vp.new_vgname); + + /* + * Create a device filter so that we are only working with the devices + * in arg_import. With the original devs hidden (that arg_import were + * cloned from), we can read and write the cloned PVs and VG without + * touching the original PVs/VG. + */ + + init_internal_filtering(1); + dm_list_iterate_items(vd, &vp.arg_import) + internal_filter_allow(cmd->mem, vd->dev); + lvmcache_destroy(cmd, 1, 0); + dev_cache_full_scan(cmd->full_filter); + + log_debug("Changing VG %s to %s.", vp.old_vgname, vp.new_vgname); + + /* We don't care if the new name comes before the old in lock order. */ + lvmcache_lock_ordering(0); + + if (!lock_vol(cmd, vp.new_vgname, LCK_VG_WRITE, NULL)) { + log_error("Can't get lock for new VG name %s", vp.new_vgname); + goto out; + } + + ret = process_each_vg(cmd, 0, NULL, vp.old_vgname, NULL, READ_FOR_UPDATE | READ_ALLOW_EXPORTED, handle, _vgimportclone_vg_single); + + unlock_vg(cmd, vp.new_vgname); +out: + unlock_vg(cmd, VG_GLOBAL); + internal_filter_clear(); + init_internal_filtering(0); + lvmcache_lock_ordering(1); + destroy_processing_handle(cmd, handle); + return ret; +} + |