/* $NetBSD: lvresize.c,v 1.1.1.3 2009/12/02 00:25:53 haad Exp $ */ /* * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. * Copyright (C) 2004-2009 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "tools.h" #define SIZE_BUF 128 struct lvresize_params { const char *vg_name; const char *lv_name; uint32_t stripes; uint32_t stripe_size; uint32_t mirrors; const struct segment_type *segtype; /* size */ uint32_t extents; uint64_t size; sign_t sign; percent_t percent; enum { LV_ANY = 0, LV_REDUCE = 1, LV_EXTEND = 2 } resize; int resizefs; int nofsck; int argc; char **argv; }; static int _validate_stripesize(struct cmd_context *cmd, const struct volume_group *vg, struct lvresize_params *lp) { if (arg_sign_value(cmd, stripesize_ARG, 0) == SIGN_MINUS) { log_error("Stripesize may not be negative."); return 0; } if (arg_uint_value(cmd, stripesize_ARG, 0) > STRIPE_SIZE_LIMIT * 2) { log_error("Stripe size cannot be larger than %s", display_size(cmd, (uint64_t) STRIPE_SIZE_LIMIT)); return 0; } if (!(vg->fid->fmt->features & FMT_SEGMENTS)) log_warn("Varied stripesize not supported. Ignoring."); else if (arg_uint_value(cmd, stripesize_ARG, 0) > vg->extent_size * 2) { log_error("Reducing stripe size %s to maximum, " "physical extent size %s", display_size(cmd, (uint64_t) arg_uint_value(cmd, stripesize_ARG, 0)), display_size(cmd, (uint64_t) vg->extent_size)); lp->stripe_size = vg->extent_size; } else lp->stripe_size = arg_uint_value(cmd, stripesize_ARG, 0); if (lp->mirrors) { log_error("Mirrors and striping cannot be combined yet."); return 0; } if (lp->stripe_size & (lp->stripe_size - 1)) { log_error("Stripe size must be power of 2"); return 0; } return 1; } static int _request_confirmation(struct cmd_context *cmd, const struct volume_group *vg, const struct logical_volume *lv, const struct lvresize_params *lp) { struct lvinfo info; memset(&info, 0, sizeof(info)); if (!lv_info(cmd, lv, &info, 1, 0) && driver_version(NULL, 0)) { log_error("lv_info failed: aborting"); return 0; } if (lp->resizefs) { if (!info.exists) { log_error("Logical volume %s must be activated " "before resizing filesystem", lp->lv_name); return 0; } return 1; } if (!info.exists) return 1; log_warn("WARNING: Reducing active%s logical volume to %s", info.open_count ? " and open" : "", display_size(cmd, (uint64_t) lp->extents * vg->extent_size)); log_warn("THIS MAY DESTROY YOUR DATA (filesystem etc.)"); if (!arg_count(cmd, force_ARG)) { if (yes_no_prompt("Do you really want to reduce %s? [y/n]: ", lp->lv_name) == 'n') { log_print("Logical volume %s NOT reduced", lp->lv_name); return 0; } if (sigint_caught()) return 0; } return 1; } enum fsadm_cmd_e { FSADM_CMD_CHECK, FSADM_CMD_RESIZE }; #define FSADM_CMD "fsadm" #define FSADM_CMD_MAX_ARGS 6 /* * FSADM_CMD --dry-run --verbose --force check lv_path * FSADM_CMD --dry-run --verbose --force resize lv_path size */ static int _fsadm_cmd(struct cmd_context *cmd, const struct volume_group *vg, const struct lvresize_params *lp, enum fsadm_cmd_e fcmd) { char lv_path[PATH_MAX]; char size_buf[SIZE_BUF]; const char *argv[FSADM_CMD_MAX_ARGS + 2]; unsigned i = 0; argv[i++] = FSADM_CMD; if (test_mode()) argv[i++] = "--dry-run"; if (verbose_level() >= _LOG_NOTICE) argv[i++] = "--verbose"; if (arg_count(cmd, force_ARG)) argv[i++] = "--force"; argv[i++] = (fcmd == FSADM_CMD_RESIZE) ? "resize" : "check"; if (dm_snprintf(lv_path, PATH_MAX, "%s%s/%s", cmd->dev_dir, lp->vg_name, lp->lv_name) < 0) { log_error("Couldn't create LV path for %s", lp->lv_name); return 0; } argv[i++] = lv_path; if (fcmd == FSADM_CMD_RESIZE) { if (dm_snprintf(size_buf, SIZE_BUF, "%" PRIu64 "K", (uint64_t) lp->extents * vg->extent_size / 2) < 0) { log_error("Couldn't generate new LV size string"); return 0; } argv[i++] = size_buf; } argv[i] = NULL; return exec_cmd(cmd, argv); } static int _lvresize_params(struct cmd_context *cmd, int argc, char **argv, struct lvresize_params *lp) { const char *cmd_name; char *st; unsigned dev_dir_found = 0; lp->sign = SIGN_NONE; lp->resize = LV_ANY; cmd_name = command_name(cmd); if (!strcmp(cmd_name, "lvreduce")) lp->resize = LV_REDUCE; if (!strcmp(cmd_name, "lvextend")) lp->resize = LV_EXTEND; /* * Allow omission of extents and size if the user has given us * one or more PVs. Most likely, the intent was "resize this * LV the best you can with these PVs" */ if ((arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) == 0) && (argc >= 2)) { lp->extents = 100; lp->percent = PERCENT_PVS; lp->sign = SIGN_PLUS; } else if ((arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) != 1)) { log_error("Please specify either size or extents but not " "both."); return 0; } if (arg_count(cmd, extents_ARG)) { lp->extents = arg_uint_value(cmd, extents_ARG, 0); lp->sign = arg_sign_value(cmd, extents_ARG, SIGN_NONE); lp->percent = arg_percent_value(cmd, extents_ARG, PERCENT_NONE); } /* Size returned in kilobyte units; held in sectors */ if (arg_count(cmd, size_ARG)) { lp->size = arg_uint64_value(cmd, size_ARG, UINT64_C(0)); lp->sign = arg_sign_value(cmd, size_ARG, SIGN_NONE); lp->percent = PERCENT_NONE; } if (lp->resize == LV_EXTEND && lp->sign == SIGN_MINUS) { log_error("Negative argument not permitted - use lvreduce"); return 0; } if (lp->resize == LV_REDUCE && lp->sign == SIGN_PLUS) { log_error("Positive sign not permitted - use lvextend"); return 0; } lp->resizefs = arg_is_set(cmd, resizefs_ARG); lp->nofsck = arg_is_set(cmd, nofsck_ARG); if (!argc) { log_error("Please provide the logical volume name"); return 0; } lp->lv_name = argv[0]; argv++; argc--; if (!(lp->lv_name = skip_dev_dir(cmd, lp->lv_name, &dev_dir_found)) || !(lp->vg_name = extract_vgname(cmd, lp->lv_name))) { log_error("Please provide a volume group name"); return 0; } if (!validate_name(lp->vg_name)) { log_error("Volume group name %s has invalid characters", lp->vg_name); return 0; } if ((st = strrchr(lp->lv_name, '/'))) lp->lv_name = st + 1; lp->argc = argc; lp->argv = argv; return 1; } static int _lvresize(struct cmd_context *cmd, struct volume_group *vg, struct lvresize_params *lp) { struct logical_volume *lv; struct lvinfo info; uint32_t stripesize_extents = 0; uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0; uint32_t seg_mirrors = 0; uint32_t extents_used = 0; uint32_t size_rest; uint32_t pv_extent_count = 0; alloc_policy_t alloc; struct logical_volume *lock_lv; struct lv_list *lvl; struct lv_segment *seg; uint32_t seg_extents; uint32_t sz, str; struct dm_list *pvh = NULL; /* does LV exist? */ if (!(lvl = find_lv_in_vg(vg, lp->lv_name))) { log_error("Logical volume %s not found in volume group %s", lp->lv_name, lp->vg_name); return ECMD_FAILED; } if (arg_count(cmd, stripes_ARG)) { if (vg->fid->fmt->features & FMT_SEGMENTS) lp->stripes = arg_uint_value(cmd, stripes_ARG, 1); else log_warn("Varied striping not supported. Ignoring."); } if (arg_count(cmd, mirrors_ARG)) { if (vg->fid->fmt->features & FMT_SEGMENTS) lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 1) + 1; else log_warn("Mirrors not supported. Ignoring."); if (arg_sign_value(cmd, mirrors_ARG, 0) == SIGN_MINUS) { log_error("Mirrors argument may not be negative"); return EINVALID_CMD_LINE; } } if (arg_count(cmd, stripesize_ARG) && !_validate_stripesize(cmd, vg, lp)) return EINVALID_CMD_LINE; lv = lvl->lv; if (lv->status & LOCKED) { log_error("Can't resize locked LV %s", lv->name); return ECMD_FAILED; } if (lv->status & CONVERTING) { log_error("Can't resize %s while lvconvert in progress", lv->name); return ECMD_FAILED; } alloc = arg_uint_value(cmd, alloc_ARG, lv->alloc); if (lp->size) { if (lp->size % vg->extent_size) { if (lp->sign == SIGN_MINUS) lp->size -= lp->size % vg->extent_size; else lp->size += vg->extent_size - (lp->size % vg->extent_size); log_print("Rounding up size to full physical extent %s", display_size(cmd, (uint64_t) lp->size)); } lp->extents = lp->size / vg->extent_size; } if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc, lp->argv, 1) : &vg->pvs)) { stack; return ECMD_FAILED; } switch(lp->percent) { case PERCENT_VG: lp->extents = lp->extents * vg->extent_count / 100; break; case PERCENT_FREE: lp->extents = lp->extents * vg->free_count / 100; break; case PERCENT_LV: lp->extents = lp->extents * lv->le_count / 100; break; case PERCENT_PVS: if (lp->argc) { pv_extent_count = pv_list_extents_free(pvh); lp->extents = lp->extents * pv_extent_count / 100; } else lp->extents = lp->extents * vg->extent_count / 100; break; case PERCENT_NONE: break; } if (lp->sign == SIGN_PLUS) lp->extents += lv->le_count; if (lp->sign == SIGN_MINUS) { if (lp->extents >= lv->le_count) { log_error("Unable to reduce %s below 1 extent", lp->lv_name); return EINVALID_CMD_LINE; } lp->extents = lv->le_count - lp->extents; } if (!lp->extents) { log_error("New size of 0 not permitted"); return EINVALID_CMD_LINE; } if (lp->extents == lv->le_count) { if (!lp->resizefs) { log_error("New size (%d extents) matches existing size " "(%d extents)", lp->extents, lv->le_count); return EINVALID_CMD_LINE; } lp->resize = LV_EXTEND; /* lets pretend zero size extension */ } seg_size = lp->extents - lv->le_count; /* Use segment type of last segment */ dm_list_iterate_items(seg, &lv->segments) { lp->segtype = seg->segtype; } /* FIXME Support LVs with mixed segment types */ if (lp->segtype != arg_ptr_value(cmd, type_ARG, lp->segtype)) { log_error("VolumeType does not match (%s)", lp->segtype->name); return EINVALID_CMD_LINE; } /* If extending, find stripes, stripesize & size of last segment */ if ((lp->extents > lv->le_count) && !(lp->stripes == 1 || (lp->stripes > 1 && lp->stripe_size))) { dm_list_iterate_items(seg, &lv->segments) { if (!seg_is_striped(seg)) continue; sz = seg->stripe_size; str = seg->area_count; if ((seg_stripesize && seg_stripesize != sz && !lp->stripe_size) || (seg_stripes && seg_stripes != str && !lp->stripes)) { log_error("Please specify number of " "stripes (-i) and stripesize (-I)"); return EINVALID_CMD_LINE; } seg_stripesize = sz; seg_stripes = str; } if (!lp->stripes) lp->stripes = seg_stripes; if (!lp->stripe_size && lp->stripes > 1) { if (seg_stripesize) { log_print("Using stripesize of last segment %s", display_size(cmd, (uint64_t) seg_stripesize)); lp->stripe_size = seg_stripesize; } else { lp->stripe_size = find_config_tree_int(cmd, "metadata/stripesize", DEFAULT_STRIPESIZE) * 2; log_print("Using default stripesize %s", display_size(cmd, (uint64_t) lp->stripe_size)); } } } /* If extending, find mirrors of last segment */ if ((lp->extents > lv->le_count)) { dm_list_iterate_back_items(seg, &lv->segments) { if (seg_is_mirrored(seg)) seg_mirrors = lv_mirror_count(seg->lv); else seg_mirrors = 0; break; } if (!arg_count(cmd, mirrors_ARG) && seg_mirrors) { log_print("Extending %" PRIu32 " mirror images.", seg_mirrors); lp->mirrors = seg_mirrors; } if ((arg_count(cmd, mirrors_ARG) || seg_mirrors) && (lp->mirrors != seg_mirrors)) { log_error("Cannot vary number of mirrors in LV yet."); return EINVALID_CMD_LINE; } } /* If reducing, find stripes, stripesize & size of last segment */ if (lp->extents < lv->le_count) { extents_used = 0; if (lp->stripes || lp->stripe_size || lp->mirrors) log_error("Ignoring stripes, stripesize and mirrors " "arguments when reducing"); dm_list_iterate_items(seg, &lv->segments) { seg_extents = seg->len; if (seg_is_striped(seg)) { seg_stripesize = seg->stripe_size; seg_stripes = seg->area_count; } if (seg_is_mirrored(seg)) seg_mirrors = lv_mirror_count(seg->lv); else seg_mirrors = 0; if (lp->extents <= extents_used + seg_extents) break; extents_used += seg_extents; } seg_size = lp->extents - extents_used; lp->stripe_size = seg_stripesize; lp->stripes = seg_stripes; lp->mirrors = seg_mirrors; } if (lp->stripes > 1 && !lp->stripe_size) { log_error("Stripesize for striped segment should not be 0!"); return EINVALID_CMD_LINE; } if ((lp->stripes > 1)) { if (!(stripesize_extents = lp->stripe_size / vg->extent_size)) stripesize_extents = 1; if ((size_rest = seg_size % (lp->stripes * stripesize_extents))) { log_print("Rounding size (%d extents) down to stripe " "boundary size for segment (%d extents)", lp->extents, lp->extents - size_rest); lp->extents = lp->extents - size_rest; } if (lp->stripe_size < STRIPE_SIZE_MIN) { log_error("Invalid stripe size %s", display_size(cmd, (uint64_t) lp->stripe_size)); return EINVALID_CMD_LINE; } } if (lp->extents < lv->le_count) { if (lp->resize == LV_EXTEND) { log_error("New size given (%d extents) not larger " "than existing size (%d extents)", lp->extents, lv->le_count); return EINVALID_CMD_LINE; } lp->resize = LV_REDUCE; } else if (lp->extents > lv->le_count) { if (lp->resize == LV_REDUCE) { log_error("New size given (%d extents) not less than " "existing size (%d extents)", lp->extents, lv->le_count); return EINVALID_CMD_LINE; } lp->resize = LV_EXTEND; } if (lv_is_origin(lv)) { if (lp->resize == LV_REDUCE) { log_error("Snapshot origin volumes cannot be reduced " "in size yet."); return ECMD_FAILED; } memset(&info, 0, sizeof(info)); if (lv_info(cmd, lv, &info, 0, 0) && info.exists) { log_error("Snapshot origin volumes can be resized " "only while inactive: try lvchange -an"); return ECMD_FAILED; } } if ((lp->resize == LV_REDUCE) && lp->argc) log_warn("Ignoring PVs on command line when reducing"); /* Request confirmation before operations that are often mistakes. */ if ((lp->resizefs || (lp->resize == LV_REDUCE)) && !_request_confirmation(cmd, vg, lv, lp)) { stack; return ECMD_FAILED; } if (lp->resizefs) { if (!lp->nofsck && !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_CHECK)) { stack; return ECMD_FAILED; } if ((lp->resize == LV_REDUCE) && !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE)) { stack; return ECMD_FAILED; } } if (!archive(vg)) { stack; return ECMD_FAILED; } log_print("%sing logical volume %s to %s", (lp->resize == LV_REDUCE) ? "Reduc" : "Extend", lp->lv_name, display_size(cmd, (uint64_t) lp->extents * vg->extent_size)); if (lp->resize == LV_REDUCE) { if (!lv_reduce(lv, lv->le_count - lp->extents)) { stack; return ECMD_FAILED; } } else if ((lp->extents > lv->le_count) && /* Ensure we extend */ !lv_extend(lv, lp->segtype, lp->stripes, lp->stripe_size, lp->mirrors, lp->extents - lv->le_count, NULL, 0u, 0u, pvh, alloc)) { stack; return ECMD_FAILED; } /* store vg on disk(s) */ if (!vg_write(vg)) { stack; return ECMD_FAILED; } /* If snapshot, must suspend all associated devices */ if (lv_is_cow(lv)) lock_lv = origin_from_cow(lv); else lock_lv = lv; if (!suspend_lv(cmd, lock_lv)) { log_error("Failed to suspend %s", lp->lv_name); vg_revert(vg); backup(vg); return ECMD_FAILED; } if (!vg_commit(vg)) { stack; resume_lv(cmd, lock_lv); backup(vg); return ECMD_FAILED; } if (!resume_lv(cmd, lock_lv)) { log_error("Problem reactivating %s", lp->lv_name); backup(vg); return ECMD_FAILED; } backup(vg); log_print("Logical volume %s successfully resized", lp->lv_name); if (lp->resizefs && (lp->resize == LV_EXTEND) && !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE)) { stack; return ECMD_FAILED; } return ECMD_PROCESSED; } int lvresize(struct cmd_context *cmd, int argc, char **argv) { struct lvresize_params lp; struct volume_group *vg; int r; memset(&lp, 0, sizeof(lp)); if (!_lvresize_params(cmd, argc, argv, &lp)) return EINVALID_CMD_LINE; log_verbose("Finding volume group %s", lp.vg_name); vg = vg_read_for_update(cmd, lp.vg_name, NULL, 0); if (vg_read_error(vg)) { vg_release(vg); stack; return ECMD_FAILED; } if (!(r = _lvresize(cmd, vg, &lp))) stack; unlock_and_release_vg(cmd, vg, lp.vg_name); return r; }