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git://sourceware.org/git/lvm2.git
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584 lines
14 KiB
C
584 lines
14 KiB
C
/*
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* Copyright (C) 2005 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "tools.h"
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#include "lv_alloc.h"
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struct lvconvert_params {
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int snapshot;
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int zero;
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const char *origin;
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const char *lv_name;
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const char *vg_name;
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uint32_t chunk_size;
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uint32_t region_size;
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uint32_t mirrors;
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sign_t mirrors_sign;
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struct segment_type *segtype;
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alloc_policy_t alloc;
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int pv_count;
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char **pvs;
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struct list *pvh;
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};
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static int _lvconvert_name_params(struct lvconvert_params *lp,
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struct cmd_context *cmd,
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int *pargc, char ***pargv)
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{
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char *ptr;
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const char *vg_name = NULL;
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if (lp->snapshot) {
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if (!*pargc) {
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log_error("Please specify a logical volume to act as "
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"the snapshot origin.");
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return 0;
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}
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lp->origin = *pargv[0];
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(*pargv)++, (*pargc)--;
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if (!(lp->vg_name = extract_vgname(cmd, lp->origin))) {
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log_error("The origin name should include the "
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"volume group.");
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return 0;
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}
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/* Strip the volume group from the origin */
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if ((ptr = strrchr(lp->origin, (int) '/')))
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lp->origin = ptr + 1;
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}
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if (!*pargc) {
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log_error("Please provide logical volume path");
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return 0;
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}
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lp->lv_name = (*pargv)[0];
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(*pargv)++, (*pargc)--;
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if (strchr(lp->lv_name, '/') &&
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(vg_name = extract_vgname(cmd, lp->lv_name)) &&
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lp->vg_name && strcmp(vg_name, lp->vg_name)) {
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log_error("Please use a single volume group name "
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"(\"%s\" or \"%s\")", vg_name, lp->vg_name);
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return 0;
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}
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if (!lp->vg_name)
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lp->vg_name = vg_name;
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if (!validate_name(lp->vg_name)) {
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log_error("Please provide a valid volume group name");
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return 0;
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}
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if ((ptr = strrchr(lp->lv_name, '/')))
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lp->lv_name = ptr + 1;
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if (!apply_lvname_restrictions(lp->lv_name))
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return_0;
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return 1;
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}
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static int _read_params(struct lvconvert_params *lp, struct cmd_context *cmd,
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int argc, char **argv)
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{
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int region_size;
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int pagesize = lvm_getpagesize();
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memset(lp, 0, sizeof(*lp));
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if (arg_count(cmd, mirrors_ARG) + arg_count(cmd, snapshot_ARG) != 1) {
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log_error("Exactly one of --mirrors or --snapshot arguments "
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"required.");
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return 0;
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}
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if (arg_count(cmd, snapshot_ARG))
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lp->snapshot = 1;
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if (arg_count(cmd, mirrors_ARG)) {
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lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 0);
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lp->mirrors_sign = arg_sign_value(cmd, mirrors_ARG, 0);
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}
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lp->alloc = ALLOC_INHERIT;
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if (arg_count(cmd, alloc_ARG))
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lp->alloc = arg_uint_value(cmd, alloc_ARG, lp->alloc);
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if (lp->snapshot) {
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if (arg_count(cmd, regionsize_ARG)) {
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log_error("--regionsize is only available with mirrors");
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return 0;
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}
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if (arg_sign_value(cmd, chunksize_ARG, 0) == SIGN_MINUS) {
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log_error("Negative chunk size is invalid");
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return 0;
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}
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lp->chunk_size = 2 * arg_uint_value(cmd, chunksize_ARG, 8);
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if (lp->chunk_size < 8 || lp->chunk_size > 1024 ||
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(lp->chunk_size & (lp->chunk_size - 1))) {
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log_error("Chunk size must be a power of 2 in the "
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"range 4K to 512K");
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return 0;
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}
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log_verbose("Setting chunksize to %d sectors.", lp->chunk_size);
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if (!(lp->segtype = get_segtype_from_string(cmd, "snapshot")))
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return_0;
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lp->zero = strcmp(arg_str_value(cmd, zero_ARG,
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(lp->segtype->flags &
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SEG_CANNOT_BE_ZEROED) ?
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"n" : "y"), "n");
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} else { /* Mirrors */
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if (arg_count(cmd, chunksize_ARG)) {
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log_error("--chunksize is only available with "
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"snapshots");
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return 0;
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}
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if (arg_count(cmd, zero_ARG)) {
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log_error("--zero is only available with snapshots");
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return 0;
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}
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/*
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* --regionsize is only valid if converting an LV into a mirror.
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* Checked when we know the state of the LV being converted.
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*/
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if (arg_count(cmd, regionsize_ARG)) {
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if (arg_sign_value(cmd, regionsize_ARG, 0) ==
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SIGN_MINUS) {
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log_error("Negative regionsize is invalid");
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return 0;
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}
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lp->region_size = 2 * arg_uint_value(cmd,
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regionsize_ARG, 0);
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} else {
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region_size = 2 * find_config_tree_int(cmd,
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"activation/mirror_region_size",
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DEFAULT_MIRROR_REGION_SIZE);
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if (region_size < 0) {
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log_error("Negative regionsize in "
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"configuration file is invalid");
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return 0;
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}
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lp->region_size = region_size;
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}
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if (lp->region_size % (pagesize >> SECTOR_SHIFT)) {
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log_error("Region size (%" PRIu32 ") must be "
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"a multiple of machine memory "
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"page size (%d)",
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lp->region_size, pagesize >> SECTOR_SHIFT);
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return 0;
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}
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if (lp->region_size & (lp->region_size - 1)) {
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log_error("Region size (%" PRIu32
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") must be a power of 2", lp->region_size);
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return 0;
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}
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if (!lp->region_size) {
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log_error("Non-zero region size must be supplied.");
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return 0;
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}
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if (!(lp->segtype = get_segtype_from_string(cmd, "striped")))
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return_0;
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}
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if (activation() && lp->segtype->ops->target_present &&
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!lp->segtype->ops->target_present(NULL)) {
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log_error("%s: Required device-mapper target(s) not "
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"detected in your kernel", lp->segtype->name);
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return 0;
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}
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if (!_lvconvert_name_params(lp, cmd, &argc, &argv))
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return_0;
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lp->pv_count = argc;
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lp->pvs = argv;
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return 1;
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}
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static int lvconvert_mirrors(struct cmd_context * cmd, struct logical_volume * lv,
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struct lvconvert_params *lp)
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{
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struct lv_segment *seg;
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uint32_t existing_mirrors;
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struct alloc_handle *ah = NULL;
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struct logical_volume *log_lv;
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struct list *parallel_areas;
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struct segment_type *segtype; /* FIXME: could I just use lp->segtype */
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float sync_percent;
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seg = first_seg(lv);
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existing_mirrors = seg->area_count;
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/* Adjust required number of mirrors */
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if (lp->mirrors_sign == SIGN_PLUS)
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lp->mirrors = existing_mirrors + lp->mirrors;
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else if (lp->mirrors_sign == SIGN_MINUS) {
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if (lp->mirrors >= existing_mirrors) {
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log_error("Logical volume %s only has %" PRIu32 " mirrors.",
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lv->name, existing_mirrors);
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return 0;
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}
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lp->mirrors = existing_mirrors - lp->mirrors;
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} else
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lp->mirrors += 1;
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if (arg_count(cmd, regionsize_ARG) && (lv->status & MIRRORED) &&
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(lp->region_size != seg->region_size)) {
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log_error("Mirror log region size cannot be changed on "
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"an existing mirror.");
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return 0;
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}
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if ((lp->mirrors == 1)) {
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if (!(lv->status & MIRRORED)) {
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log_error("Logical volume %s is already not mirrored.",
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lv->name);
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return 1;
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}
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if (!remove_mirror_images(seg, 1,
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lp->pv_count ? lp->pvh : NULL, 1))
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return_0;
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} else { /* mirrors > 1 */
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if ((lv->status & MIRRORED)) {
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if (list_size(&lv->segments) != 1) {
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log_error("Logical volume %s has multiple "
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"mirror segments.", lv->name);
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return 0;
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}
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if (lp->mirrors == existing_mirrors) {
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if (!seg->log_lv && !arg_count(cmd, corelog_ARG)) {
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/* No disk log present, add one. */
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if (!(parallel_areas = build_parallel_areas_from_lv(cmd, lv)))
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return_0;
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if (!lv_mirror_percent(cmd, lv, 0, &sync_percent, NULL)) {
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log_error("Unable to determine mirror sync status.");
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return 0;
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}
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segtype = get_segtype_from_string(cmd, "striped");
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if (!(ah = allocate_extents(lv->vg, NULL, segtype, 0,
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0, 1, 0,
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NULL, 0, 0, lp->pvh,
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lp->alloc,
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parallel_areas))) {
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stack;
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return 0;
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}
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if (sync_percent >= 100.0)
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init_mirror_in_sync(1);
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else
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init_mirror_in_sync(0);
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if (!(log_lv = create_mirror_log(cmd, lv->vg, ah,
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lp->alloc, lv->name,
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(sync_percent >= 100.0) ?
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1 : 0, &lv->tags))) {
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log_error("Failed to create mirror log.");
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return 0;
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}
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seg->log_lv = log_lv;
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log_lv->status |= MIRROR_LOG;
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first_seg(log_lv)->mirror_seg = seg;
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} else if (seg->log_lv && arg_count(cmd, corelog_ARG)) {
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/* Had disk log, switch to core. */
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if (!lv_mirror_percent(cmd, lv, 0, &sync_percent, NULL)) {
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log_error("Unable to determine mirror sync status.");
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return 0;
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}
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if (sync_percent >= 100.0)
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init_mirror_in_sync(1);
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else
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init_mirror_in_sync(0);
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if (!remove_mirror_images(seg, lp->mirrors,
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lp->pv_count ?
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lp->pvh : NULL, 1))
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return_0;
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} else {
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/* No change */
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log_error("Logical volume %s already has %"
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PRIu32 " mirror(s).", lv->name,
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lp->mirrors - 1);
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return 1;
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}
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} else if (lp->mirrors > existing_mirrors) {
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/* FIXME Unless anywhere, remove PV of log_lv
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* from allocatable_pvs & allocate
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* (mirrors - existing_mirrors) new areas
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*/
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/* FIXME Create mirror hierarchy to sync */
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log_error("Adding mirror images is not "
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"supported yet.");
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return 0;
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} else {
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/* Reduce number of mirrors */
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if (!remove_mirror_images(seg, lp->mirrors,
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lp->pv_count ?
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lp->pvh : NULL, 0))
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return_0;
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}
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} else {
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/* Make existing LV into mirror set */
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/* FIXME Share code with lvcreate */
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/* FIXME Why is this restriction here? Fix it! */
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list_iterate_items(seg, &lv->segments) {
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if (seg_is_striped(seg) && seg->area_count > 1) {
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log_error("Mirrors of striped volumes are not yet supported.");
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return 0;
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}
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}
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if (!(parallel_areas = build_parallel_areas_from_lv(cmd, lv)))
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return_0;
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if (!(ah = allocate_extents(lv->vg, NULL, lp->segtype,
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1, lp->mirrors - 1,
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arg_count(cmd, corelog_ARG) ? 0 : 1,
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lv->le_count * (lp->mirrors - 1),
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NULL, 0, 0, lp->pvh,
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lp->alloc,
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parallel_areas)))
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return_0;
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lp->region_size = adjusted_mirror_region_size(lv->vg->extent_size,
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lv->le_count,
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lp->region_size);
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log_lv = NULL;
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if (!arg_count(cmd, corelog_ARG) &&
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!(log_lv = create_mirror_log(cmd, lv->vg, ah,
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lp->alloc,
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lv->name, 0, &lv->tags))) {
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log_error("Failed to create mirror log.");
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return 0;
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}
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if (!create_mirror_layers(ah, 1, lp->mirrors, lv,
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lp->segtype, 0,
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lp->region_size,
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log_lv))
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return_0;
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}
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}
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log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
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if (!vg_write(lv->vg))
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return_0;
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backup(lv->vg);
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if (!suspend_lv(cmd, lv)) {
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log_error("Failed to lock %s", lv->name);
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vg_revert(lv->vg);
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return 0;
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}
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if (!vg_commit(lv->vg)) {
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resume_lv(cmd, lv);
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return 0;
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}
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log_very_verbose("Updating \"%s\" in kernel", lv->name);
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if (!resume_lv(cmd, lv)) {
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log_error("Problem reactivating %s", lv->name);
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return 0;
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}
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log_print("Logical volume %s converted.", lv->name);
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return 1;
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}
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static int lvconvert_snapshot(struct cmd_context *cmd,
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struct logical_volume *lv,
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struct lvconvert_params *lp)
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{
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struct logical_volume *org;
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if (!(org = find_lv(lv->vg, lp->origin))) {
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log_error("Couldn't find origin volume '%s'.", lp->origin);
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return 0;
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}
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if (org->status & (LOCKED|PVMOVE) || lv_is_cow(org)) {
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log_error("Unable to create a snapshot of a %s LV.",
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org->status & LOCKED ? "locked" :
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org->status & PVMOVE ? "pvmove" : "snapshot");
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return 0;
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}
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if (!lp->zero || !(lv->status & LVM_WRITE))
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log_warn("WARNING: \"%s\" not zeroed", lv->name);
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else if (!set_lv(cmd, lv, 0, 0)) {
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log_error("Aborting. Failed to wipe snapshot "
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"exception store.");
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return 0;
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}
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if (!deactivate_lv(cmd, lv)) {
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log_error("Couldn't deactivate LV %s.", lv->name);
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return 0;
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}
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if (!vg_add_snapshot(lv->vg->fid, NULL, org, lv, NULL, org->le_count,
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lp->chunk_size)) {
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log_error("Couldn't create snapshot.");
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return 0;
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}
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/* store vg on disk(s) */
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if (!vg_write(lv->vg))
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return_0;
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backup(lv->vg);
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if (!suspend_lv(cmd, org)) {
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log_error("Failed to suspend origin %s", org->name);
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vg_revert(lv->vg);
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return 0;
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}
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if (!vg_commit(lv->vg))
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return_0;
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if (!resume_lv(cmd, org)) {
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log_error("Problem reactivating origin %s", org->name);
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return 0;
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}
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log_print("Logical volume %s converted to snapshot.", lv->name);
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return 1;
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}
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static int lvconvert_single(struct cmd_context *cmd, struct logical_volume *lv,
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void *handle)
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{
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struct lvconvert_params *lp = handle;
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if (lv->status & LOCKED) {
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log_error("Cannot convert locked LV %s", lv->name);
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return ECMD_FAILED;
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}
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if (lv_is_origin(lv)) {
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log_error("Can't convert logical volume \"%s\" under snapshot",
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lv->name);
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return ECMD_FAILED;
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}
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if (lv_is_cow(lv)) {
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log_error("Can't convert snapshot logical volume \"%s\"",
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lv->name);
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return ECMD_FAILED;
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}
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if (lv->status & PVMOVE) {
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log_error("Unable to convert pvmove LV %s", lv->name);
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return ECMD_FAILED;
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}
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if (arg_count(cmd, mirrors_ARG)) {
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if (!archive(lv->vg))
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return ECMD_FAILED;
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if (!lvconvert_mirrors(cmd, lv, lp))
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return ECMD_FAILED;
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} else if (lp->snapshot) {
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if (!archive(lv->vg))
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return ECMD_FAILED;
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if (!lvconvert_snapshot(cmd, lv, lp))
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return ECMD_FAILED;
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}
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return ECMD_PROCESSED;
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}
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|
|
int lvconvert(struct cmd_context * cmd, int argc, char **argv)
|
|
{
|
|
int consistent = 1;
|
|
struct volume_group *vg;
|
|
struct lv_list *lvl;
|
|
struct lvconvert_params lp;
|
|
int ret = ECMD_FAILED;
|
|
|
|
if (!_read_params(&lp, cmd, argc, argv)) {
|
|
stack;
|
|
return EINVALID_CMD_LINE;
|
|
}
|
|
|
|
log_verbose("Checking for existing volume group \"%s\"", lp.vg_name);
|
|
|
|
if (!lock_vol(cmd, lp.vg_name, LCK_VG_WRITE)) {
|
|
log_error("Can't get lock for %s", lp.vg_name);
|
|
return ECMD_FAILED;
|
|
}
|
|
|
|
if (!(vg = vg_read(cmd, lp.vg_name, NULL, &consistent))) {
|
|
log_error("Volume group \"%s\" doesn't exist", lp.vg_name);
|
|
goto error;
|
|
}
|
|
|
|
if (!vg_check_status(vg, CLUSTERED | EXPORTED_VG | LVM_WRITE))
|
|
goto error;
|
|
|
|
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);
|
|
goto error;
|
|
}
|
|
|
|
if (lp.pv_count) {
|
|
if (!(lp.pvh = create_pv_list(cmd->mem, vg, lp.pv_count,
|
|
lp.pvs, 1))) {
|
|
stack;
|
|
goto error;
|
|
}
|
|
} else
|
|
lp.pvh = &vg->pvs;
|
|
|
|
ret = lvconvert_single(cmd, lvl->lv, &lp);
|
|
|
|
error:
|
|
unlock_vg(cmd, lp.vg_name);
|
|
return ret;
|
|
}
|