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author | Alasdair Kergon <agk@redhat.com> | 2001-11-08 16:15:58 +0000 |
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committer | Alasdair Kergon <agk@redhat.com> | 2001-11-08 16:15:58 +0000 |
commit | 94b8220f6a33738fab26544936b3e40b3448fa29 (patch) | |
tree | 943ba6aa87898e8c6ad851e3ab1bfc89c8d80110 /tools/lvreduce.c | |
parent | f90fc5faf0ff3be581b19fab1ed19a9aad8fcbcd (diff) | |
download | lvm2-94b8220f6a33738fab26544936b3e40b3448fa29.tar.gz |
lvdisplay & lvreduce
Diffstat (limited to 'tools/lvreduce.c')
-rw-r--r-- | tools/lvreduce.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/tools/lvreduce.c b/tools/lvreduce.c new file mode 100644 index 000000000..e9163e5bc --- /dev/null +++ b/tools/lvreduce.c @@ -0,0 +1,183 @@ +/* + * Copyright (C) 2001 Sistina Software + * + * LVM is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * LVM is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with LVM; see the file COPYING. If not, write to + * the Free Software Foundation, 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + * + */ + +#include "tools.h" + +int lvreduce(int argc, char **argv) +{ + struct volume_group *vg; + struct logical_volume *lv; + struct list *lvh; + int32_t extents = 0; + int32_t size = 0; + char *lv_name, *vg_name; + char *st; + + if (arg_count(extents_ARG) + arg_count(size_ARG) != 1) { + log_error("Please specify either size or extents (not both)"); + return EINVALID_CMD_LINE; + } + + /* FIXME signed use throughout halves the maximum... */ + if (arg_count(extents_ARG)) + extents = arg_int_value(extents_ARG, 0); + + if (arg_count(size_ARG)) + size = arg_int_value(size_ARG, 0); + + if (!argc) { + log_error("Please provide the logical volume name"); + return EINVALID_CMD_LINE; + } + + lv_name = argv[0]; + argv++; + argc--; + + if (!(vg_name = extract_vgname(ios, lv_name))) { + log_error("Please provide a volume group name"); + return EINVALID_CMD_LINE; + } + + if ((st = strrchr(lv_name, '/'))) + lv_name = st + 1; + + /* does VG exist? */ + log_verbose("Finding volume group %s", vg_name); + if (!(vg = ios->vg_read(ios, vg_name))) { + log_error("Volume group %s doesn't exist", vg_name); + return ECMD_FAILED; + } + + if (!(vg->status & ACTIVE)) { + log_error("Volume group %s must be active before changing a " + "logical volume", vg_name); + return ECMD_FAILED; + } + + /* does LV exist? */ + if (!(lvh = find_lv_in_vg(vg, lv_name))) { + log_error("Logical volume %s not found in volume group %s", + lv_name, vg_name); + return ECMD_FAILED; + } + + lv = &list_item(lvh, struct lv_list)->lv; + + if (!(lv->status & ACTIVE)) { + log_error("Logical volume %s must be active before reduction", + lv_name); + return ECMD_FAILED; + } + + if (size) { + /* No of 512-byte sectors */ + extents = size * 2; + + if (extents % vg->extent_size) { + char *s1; + + extents += (signed) vg->extent_size - + (signed) (extents % vg->extent_size); + log_print("Rounding up size to full physical extent %s", + (s1 = + display_size(abs(extents) / 2, SIZE_SHORT))); + dbg_free(s1); + } + + extents /= (signed) vg->extent_size; + } + + if (!extents) { + log_error("New size of 0 not permitted"); + return EINVALID_CMD_LINE; + } + + if (extents < 0) { + if (1 - extents > lv->le_count) { + log_error("Unable to reduce %s below 1 extent", + lv_name); + return EINVALID_CMD_LINE; + } + + lv->le_count += extents; + } else { + if (extents >= lv->le_count) { + log_error("New size given (%d extents) not less than " + "existing size (%d extents)", extents, + lv->le_count); + return EINVALID_CMD_LINE; + } + lv->le_count = extents; + } + +/************ FIXME Stripes + size_rest = new_size % (vg->lv[l]->lv_stripes * vg->pe_size); + if (size_rest != 0) { + log_print + ("rounding size %ld KB to stripe boundary size ", + new_size / 2); + new_size = new_size - size_rest; + printf("%ld KB\n", new_size / 2); + } +***********************/ + + if (lv->status & ACTIVE || lv_active(lv) > 0) { + char *dummy; + log_print("WARNING: Reducing active%s logical volume to %s", + (lv_open_count(lv) > 0) ? " and open" : "", + (dummy = + display_size(lv->le_count * vg->extent_size / 2, + SIZE_SHORT))); + log_print("THIS MAY DESTROY YOUR DATA (filesystem etc.)"); + dbg_free(dummy); + } + + if (!arg_count(force_ARG)) { + if (yes_no_prompt + ("Do you really want to reduce %s? [y/n]: ", lv_name) + == 'n') { + log_print("Logical volume %s NOT reduced", lv_name); + return ECMD_FAILED; + } + } + +/********* FIXME Suspend lv ***********/ + + /* store vg on disk(s) */ + if (!ios->vg_write(ios, vg)) + return ECMD_FAILED; + + /* FIXME Ensure it always displays errors? */ + if (!lv_reactivate(lv)) + return ECMD_FAILED; + +/********* FIXME Resume *********/ + +/********* FIXME Backup + if ((ret = do_autobackup(vg_name, vg))) + return ret; +************/ + + log_print("Logical volume %s reduced", lv_name); + + return 0; +} + |