mirror of
git://sourceware.org/git/lvm2.git
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678 lines
14 KiB
C
678 lines
14 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#include "metadata.h"
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#include "import-export.h"
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#include "pool.h"
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#include "log.h"
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#include "uuid.h"
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#include "hash.h"
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#include "toolcontext.h"
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typedef int (*section_fn) (struct format_instance * fid, struct pool * mem,
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struct volume_group * vg, struct config_node * pvn,
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struct config_node * vgn,
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struct hash_table * pv_hash, struct uuid_map * um);
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#define _read_int32(root, path, result) \
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get_config_uint32(root, path, '/', result)
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#define _read_uint32(root, path, result) \
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get_config_uint32(root, path, '/', result)
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#define _read_int64(root, path, result) \
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get_config_uint64(root, path, '/', result)
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static int _read_id(struct id *id, struct config_node *cn, const char *path)
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{
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struct config_value *cv;
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if (!(cn = find_config_node(cn, path, '/'))) {
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log_err("Couldn't find uuid.");
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return 0;
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}
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cv = cn->v;
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if (!cv || !cv->v.str) {
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log_err("uuid must be a string.");
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return 0;
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}
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if (!id_read_format(id, cv->v.str)) {
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log_err("Invalid uuid.");
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return 0;
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}
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return 1;
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}
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static int _read_pv(struct format_instance *fid, struct pool *mem,
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struct volume_group *vg, struct config_node *pvn,
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struct config_node *vgn,
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struct hash_table *pv_hash, struct uuid_map *um)
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{
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struct physical_volume *pv;
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struct pv_list *pvl;
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struct config_node *cn;
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if (!(pvl = pool_zalloc(mem, sizeof(*pvl))) ||
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!(pvl->pv = pool_zalloc(mem, sizeof(*pvl->pv)))) {
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stack;
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return 0;
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}
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pv = pvl->pv;
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/*
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* Add the pv to the pv hash for quick lookup when we read
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* the lv segments.
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*/
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if (!hash_insert(pv_hash, pvn->key, pv)) {
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stack;
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return 0;
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}
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if (!(pvn = pvn->child)) {
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log_err("Empty pv section.");
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return 0;
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}
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if (!_read_id(&pv->id, pvn, "id")) {
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log_err("Couldn't read uuid for volume group.");
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return 0;
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}
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/*
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* Use the uuid map to convert the uuid into a device.
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*/
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if (!(pv->dev = uuid_map_lookup(um, &pv->id))) {
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char buffer[64];
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if (!id_write_format(&pv->id, buffer, sizeof(buffer)))
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log_err("Couldn't find device.");
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else
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log_err("Couldn't find device with uuid '%s'.", buffer);
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if (partial_mode())
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vg->status |= PARTIAL_VG;
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else
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return 0;
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}
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if (!(pv->vg_name = pool_strdup(mem, vg->name))) {
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stack;
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return 0;
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}
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if (!(cn = find_config_node(pvn, "status", '/'))) {
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log_err("Couldn't find status flags for physical volume.");
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return 0;
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}
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if (!(read_flags(&pv->status, PV_FLAGS, cn->v))) {
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log_err("Couldn't read status flags for physical volume.");
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return 0;
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}
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if (!_read_int64(pvn, "pe_start", &pv->pe_start)) {
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log_err("Couldn't read extent size for volume group.");
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return 0;
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}
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if (!_read_int32(pvn, "pe_count", &pv->pe_count)) {
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log_err("Couldn't find extent count (pe_count) for "
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"physical volume.");
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return 0;
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}
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/* adjust the volume group. */
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vg->extent_count += pv->pe_count;
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vg->free_count += pv->pe_count;
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pv->pe_size = vg->extent_size;
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pv->size = pv->pe_size * (uint64_t) pv->pe_count;
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pv->pe_alloc_count = 0;
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pv->fid = fid;
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vg->pv_count++;
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list_add(&vg->pvs, &pvl->list);
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return 1;
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}
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static void _insert_segment(struct logical_volume *lv,
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struct stripe_segment *seg)
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{
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struct list *segh;
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struct stripe_segment *comp;
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list_iterate(segh, &lv->segments) {
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comp = list_item(segh, struct stripe_segment);
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if (comp->le > seg->le) {
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list_add(&comp->list, &seg->list);
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return;
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}
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}
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lv->le_count += seg->len;
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list_add(&lv->segments, &seg->list);
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}
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static int _read_segment(struct pool *mem, struct volume_group *vg,
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struct logical_volume *lv, struct config_node *sn,
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struct hash_table *pv_hash)
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{
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int s;
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uint32_t stripes;
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struct stripe_segment *seg;
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struct config_node *cn;
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struct config_value *cv;
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const char *seg_name = sn->key;
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if (!(sn = sn->child)) {
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log_err("Empty segment section.");
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return 0;
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}
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if (!_read_int32(sn, "stripes", &stripes)) {
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log_err("Couldn't read 'stripes' for segment '%s'.", sn->key);
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return 0;
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}
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if (!(seg = pool_zalloc(mem, sizeof(*seg) +
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(sizeof(seg->area[0]) * stripes)))) {
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stack;
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return 0;
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}
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seg->stripes = stripes;
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seg->lv = lv;
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if (!_read_int32(sn, "start_extent", &seg->le)) {
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log_err("Couldn't read 'start_extent' for segment '%s'.",
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sn->key);
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return 0;
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}
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if (!_read_int32(sn, "extent_count", &seg->len)) {
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log_err("Couldn't read 'extent_count' for segment '%s'.",
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sn->key);
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return 0;
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}
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if (seg->stripes == 0) {
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log_err("Zero stripes is *not* allowed for segment '%s'.",
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sn->key);
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return 0;
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}
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if ((seg->stripes != 1) &&
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!_read_int32(sn, "stripe_size", &seg->stripe_size)) {
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log_err("Couldn't read 'stripe_size' for segment '%s'.",
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sn->key);
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return 0;
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}
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if (!(cn = find_config_node(sn, "areas", '/'))) {
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log_err("Couldn't find 'areas' array for segment '%s'.",
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sn->key);
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return 0;
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}
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/*
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* Read the stripes from the 'areas' array.
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* FIXME: we could move this to a separate function.
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*/
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for (cv = cn->v, s = 0; cv && s < seg->stripes; s++, cv = cv->next) {
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/* first we read the pv */
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const char *bad = "Badly formed areas array for segment '%s'.";
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struct physical_volume *pv;
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uint32_t allocated;
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if (cv->type != CFG_STRING) {
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log_err(bad, sn->key);
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return 0;
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}
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if (!(pv = hash_lookup(pv_hash, cv->v.str))) {
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log_err("Couldn't find physical volume '%s' for "
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"segment '%s'.",
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cn->v->v.str ? cn->v->v.str : "NULL", seg_name);
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return 0;
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}
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seg->area[s].pv = pv;
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if (!(cv = cv->next)) {
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log_err(bad, sn->key);
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return 0;
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}
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if (cv->type != CFG_INT) {
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log_err(bad, sn->key);
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return 0;
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}
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seg->area[s].pe = cv->v.i;
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/*
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* Adjust the extent counts in the pv and vg.
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*/
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allocated = seg->len / seg->stripes;
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pv->pe_alloc_count += allocated;
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vg->free_count -= allocated;
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}
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/*
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* Check we read the correct number of stripes.
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*/
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if (cv || (s < seg->stripes)) {
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log_err("Incorrect number of stripes in 'area' array "
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"for segment '%s'.", seg_name);
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return 0;
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}
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/*
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* Insert into correct part of segment list.
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*/
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_insert_segment(lv, seg);
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return 1;
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}
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static int _read_segments(struct pool *mem, struct volume_group *vg,
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struct logical_volume *lv, struct config_node *lvn,
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struct hash_table *pv_hash)
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{
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struct config_node *sn;
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int count = 0, seg_count;
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for (sn = lvn; sn; sn = sn->sib) {
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/*
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* All sub-sections are assumed to be segments.
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*/
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if (!sn->v) {
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if (!_read_segment(mem, vg, lv, sn, pv_hash)) {
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stack;
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return 0;
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}
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count++;
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}
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}
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if (!_read_int32(lvn, "segment_count", &seg_count)) {
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log_err("Couldn't read segment count for logical volume.");
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return 0;
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}
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if (seg_count != count) {
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log_err("segment_count and actual number of segments "
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"disagree.");
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return 0;
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}
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/*
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* Check there are no gaps or overlaps in the lv.
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*/
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if (!lv_check_segments(lv)) {
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stack;
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return 0;
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}
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/*
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* Merge segments in case someones been editing things by hand.
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*/
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if (!lv_merge_segments(lv)) {
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stack;
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return 0;
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}
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return 1;
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}
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static int _read_lv(struct format_instance *fid, struct pool *mem,
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struct volume_group *vg, struct config_node *lvn,
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struct config_node *vgn, struct hash_table *pv_hash,
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struct uuid_map *um)
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{
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struct logical_volume *lv;
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struct lv_list *lvl;
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struct config_node *cn;
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if (!(lvl = pool_zalloc(mem, sizeof(*lvl))) ||
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!(lvl->lv = pool_zalloc(mem, sizeof(*lvl->lv)))) {
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stack;
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return 0;
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}
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lv = lvl->lv;
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if (!(lv->name = pool_strdup(mem, lvn->key))) {
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stack;
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return 0;
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}
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if (!(lvn = lvn->child)) {
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log_err("Empty logical volume section.");
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return 0;
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}
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lv->vg = vg;
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/* FIXME: read full lvid */
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if (!_read_id(&lv->lvid.id[1], lvn, "id")) {
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log_err("Couldn't read uuid for logical volume %s.", lv->name);
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return 0;
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}
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memcpy(&lv->lvid.id[0], &lv->vg->id, sizeof(lv->lvid.id[0]));
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if (!(cn = find_config_node(lvn, "status", '/'))) {
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log_err("Couldn't find status flags for logical volume.");
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return 0;
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}
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if (!(read_flags(&lv->status, LV_FLAGS, cn->v))) {
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log_err("Couldn't read status flags for logical volume.");
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return 0;
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}
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lv->minor = -1;
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if ((lv->status & FIXED_MINOR) &&
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!_read_int32(lvn, "minor", &lv->minor)) {
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log_error("Couldn't read 'minor' value for logical volume.");
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return 0;
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}
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if (!_read_int32(lvn, "read_ahead", &lv->read_ahead)) {
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log_err("Couldn't read 'read_ahead' value for "
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"logical volume.");
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return 0;
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}
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list_init(&lv->segments);
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if (!_read_segments(mem, vg, lv, lvn, pv_hash)) {
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stack;
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return 0;
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}
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lv->size = (uint64_t) lv->le_count * (uint64_t) vg->extent_size;
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vg->lv_count++;
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list_add(&vg->lvs, &lvl->list);
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return 1;
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}
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static int _read_snapshot(struct format_instance *fid, struct pool *mem,
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struct volume_group *vg, struct config_node *sn,
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struct config_node *vgn, struct hash_table *pv_hash,
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struct uuid_map *um)
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{
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uint32_t chunk_size;
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const char *org_name, *cow_name;
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struct logical_volume *org, *cow;
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if (!(sn = sn->child)) {
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log_err("Empty snapshot section.");
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return 0;
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}
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if (!_read_uint32(sn, "chunk_size", &chunk_size)) {
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log_err("Couldn't read chunk size for snapshot.");
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return 0;
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}
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if (!(cow_name = find_config_str(sn, "cow_store", '/', NULL))) {
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log_err("Snapshot cow storage not specified.");
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return 0;
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}
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if (!(org_name = find_config_str(sn, "origin", '/', NULL))) {
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log_err("Snapshot origin not specified.");
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return 0;
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}
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if (!(cow = find_lv(vg, cow_name))) {
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log_err("Unknown logical volume specified for "
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"snapshot cow store.");
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return 0;
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}
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if (!(org = find_lv(vg, org_name))) {
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log_err("Unknown logical volume specified for "
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"snapshot origin.");
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return 0;
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}
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if (!vg_add_snapshot(org, cow, 1, chunk_size)) {
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stack;
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return 0;
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}
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return 1;
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}
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static int _read_sections(struct format_instance *fid,
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const char *section, section_fn fn,
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struct pool *mem,
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struct volume_group *vg, struct config_node *vgn,
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struct hash_table *pv_hash,
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struct uuid_map *um, int optional)
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{
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struct config_node *n;
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if (!(n = find_config_node(vgn, section, '/'))) {
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if (!optional) {
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log_err("Couldn't find section '%s'.", section);
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return 0;
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}
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return 1;
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}
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for (n = n->child; n; n = n->sib) {
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if (!fn(fid, mem, vg, n, vgn, pv_hash, um)) {
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stack;
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return 0;
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}
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}
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return 1;
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}
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static struct volume_group *_read_vg(struct format_instance *fid,
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struct config_file *cf,
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struct uuid_map *um)
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{
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struct config_node *vgn, *cn;
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struct volume_group *vg;
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struct hash_table *pv_hash = NULL;
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struct pool *mem = fid->fmt->cmd->mem;
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/* skip any top-level values */
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for (vgn = cf->root; (vgn && vgn->v); vgn = vgn->sib) ;
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if (!vgn) {
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log_err("Couldn't find volume group in file.");
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return NULL;
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}
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if (!(vg = pool_zalloc(mem, sizeof(*vg)))) {
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stack;
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return NULL;
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}
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vg->cmd = fid->fmt->cmd;
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/* FIXME Determine format type from file contents */
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/* eg Set to instance of fmt1 here if reading a format1 backup? */
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vg->fid = fid;
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if (!(vg->name = pool_strdup(mem, vgn->key))) {
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stack;
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goto bad;
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}
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if (!(vg->system_id = pool_zalloc(mem, NAME_LEN))) {
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stack;
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goto bad;
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}
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vgn = vgn->child;
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if ((cn = find_config_node(vgn, "system_id", '/')) && cn->v) {
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if (!cn->v->v.str) {
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log_error("system_id must be a string");
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goto bad;
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}
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strncpy(vg->system_id, cn->v->v.str, NAME_LEN);
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}
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if (!_read_id(&vg->id, vgn, "id")) {
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log_err("Couldn't read uuid for volume group %s.", vg->name);
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goto bad;
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}
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if (!_read_int32(vgn, "seqno", &vg->seqno)) {
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log_err("Couldn't read 'seqno' for volume group %s.", vg->name);
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goto bad;
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}
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if (!(cn = find_config_node(vgn, "status", '/'))) {
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log_err("Couldn't find status flags for volume group %s.",
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vg->name);
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goto bad;
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}
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if (!(read_flags(&vg->status, VG_FLAGS, cn->v))) {
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log_err("Couldn't read status flags for volume group %s.",
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vg->name);
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goto bad;
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}
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if (!_read_int32(vgn, "extent_size", &vg->extent_size)) {
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log_err("Couldn't read extent size for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* 'extent_count' and 'free_count' get filled in
|
|
* implicitly when reading in the pv's and lv's.
|
|
*/
|
|
|
|
if (!_read_int32(vgn, "max_lv", &vg->max_lv)) {
|
|
log_err("Couldn't read 'max_lv' for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
if (!_read_int32(vgn, "max_pv", &vg->max_pv)) {
|
|
log_err("Couldn't read 'max_pv' for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* The pv hash memoises the pv section names -> pv
|
|
* structures.
|
|
*/
|
|
if (!(pv_hash = hash_create(32))) {
|
|
log_err("Couldn't create hash table.");
|
|
goto bad;
|
|
}
|
|
|
|
list_init(&vg->pvs);
|
|
if (!_read_sections(fid, "physical_volumes", _read_pv, mem, vg,
|
|
vgn, pv_hash, um, 0)) {
|
|
log_err("Couldn't find all physical volumes for volume "
|
|
"group %s.", vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
list_init(&vg->lvs);
|
|
if (!_read_sections(fid, "logical_volumes", _read_lv, mem, vg,
|
|
vgn, pv_hash, um, 1)) {
|
|
log_err("Couldn't read all logical volumes for volume "
|
|
"group %s.", vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
list_init(&vg->snapshots);
|
|
if (!_read_sections(fid, "snapshots", _read_snapshot, mem, vg,
|
|
vgn, pv_hash, um, 1)) {
|
|
log_err("Couldn't read all snapshots for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
hash_destroy(pv_hash);
|
|
|
|
if (vg->status & PARTIAL_VG) {
|
|
vg->status &= ~LVM_WRITE;
|
|
vg->status |= LVM_READ;
|
|
}
|
|
|
|
/*
|
|
* Finished.
|
|
*/
|
|
return vg;
|
|
|
|
bad:
|
|
if (pv_hash)
|
|
hash_destroy(pv_hash);
|
|
|
|
pool_free(mem, vg);
|
|
return NULL;
|
|
}
|
|
|
|
static void _read_desc(struct pool *mem,
|
|
struct config_file *cf, time_t * when, char **desc)
|
|
{
|
|
const char *d;
|
|
unsigned int u = 0u;
|
|
|
|
d = find_config_str(cf->root, "description", '/', "");
|
|
*desc = pool_strdup(mem, d);
|
|
|
|
get_config_uint32(cf->root, "creation_time", '/', &u);
|
|
*when = u;
|
|
}
|
|
|
|
struct volume_group *text_vg_import(struct format_instance *fid,
|
|
const char *file,
|
|
struct uuid_map *um,
|
|
time_t * when, char **desc)
|
|
{
|
|
struct volume_group *vg = NULL;
|
|
struct config_file *cf;
|
|
|
|
*desc = NULL;
|
|
*when = 0;
|
|
|
|
if (!(cf = create_config_file())) {
|
|
stack;
|
|
goto out;
|
|
}
|
|
|
|
if (!read_config(cf, file)) {
|
|
log_error("Couldn't read volume group file.");
|
|
goto out;
|
|
}
|
|
|
|
if (!(vg = _read_vg(fid, cf, um))) {
|
|
stack;
|
|
goto out;
|
|
}
|
|
|
|
_read_desc(fid->fmt->cmd->mem, cf, when, desc);
|
|
|
|
out:
|
|
destroy_config_file(cf);
|
|
return vg;
|
|
}
|