mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
15c325f06a
from lock_vol() - otherwise it now attempts to acquire the lock and then immediately releases it. o Extend the id field in struct logical_volume to hold VG uuid + LV uuid for format1. This unique lvid can be used directly when calling lock_vol(). o Add the VG uuid to vgcache to make VG uuid lookups possible. (Another step towards using them instead of VG names internally.)
669 lines
14 KiB
C
669 lines
14 KiB
C
/*
|
|
* Copyright (C) 2001 Sistina Software (UK) Limited.
|
|
*
|
|
* This file is released under the LGPL.
|
|
*/
|
|
|
|
#include "metadata.h"
|
|
#include "import-export.h"
|
|
#include "pool.h"
|
|
#include "log.h"
|
|
#include "uuid.h"
|
|
#include "hash.h"
|
|
#include "toolcontext.h"
|
|
|
|
|
|
typedef int (*section_fn)(struct pool *mem,
|
|
struct volume_group *vg, struct config_node *pvn,
|
|
struct config_node *vgn, struct hash_table *pv_hash,
|
|
struct uuid_map *um);
|
|
|
|
#define _read_int32(root, path, result) \
|
|
get_config_uint32(root, path, '/', result)
|
|
|
|
#define _read_uint32(root, path, result) \
|
|
get_config_uint32(root, path, '/', result)
|
|
|
|
#define _read_int64(root, path, result) \
|
|
get_config_uint64(root, path, '/', result)
|
|
|
|
static int _read_id(struct id *id, struct config_node *cn, const char *path)
|
|
{
|
|
struct config_value *cv;
|
|
|
|
if (!(cn = find_config_node(cn, path, '/'))) {
|
|
log_err("Couldn't find uuid.");
|
|
return 0;
|
|
}
|
|
|
|
cv = cn->v;
|
|
if (!cv || !cv->v.str) {
|
|
log_err("uuid must be a string.");
|
|
return 0;
|
|
}
|
|
|
|
if (!id_read_format(id, cv->v.str)) {
|
|
log_err("Invalid uuid.");
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _read_pv(struct pool *mem,
|
|
struct volume_group *vg, struct config_node *pvn,
|
|
struct config_node *vgn,
|
|
struct hash_table *pv_hash,
|
|
struct uuid_map *um)
|
|
{
|
|
struct physical_volume *pv;
|
|
struct pv_list *pvl;
|
|
struct config_node *cn;
|
|
|
|
if (!(pvl = pool_zalloc(mem, sizeof(*pvl))) ||
|
|
!(pvl->pv = pool_zalloc(mem, sizeof(*pvl->pv)))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
pv = pvl->pv;
|
|
|
|
/*
|
|
* Add the pv to the pv hash for quick lookup when we read
|
|
* the lv segments.
|
|
*/
|
|
if (!hash_insert(pv_hash, pvn->key, pv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(pvn = pvn->child)) {
|
|
log_err("Empty pv section.");
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_id(&pv->id, pvn, "id")) {
|
|
log_err("Couldn't read uuid for volume group.");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Use the uuid map to convert the uuid into a device.
|
|
*/
|
|
if (!(pv->dev = uuid_map_lookup(um, &pv->id))) {
|
|
char buffer[64];
|
|
|
|
if (!id_write_format(&pv->id, buffer, sizeof(buffer))) {
|
|
log_err("Couldn't find device.");
|
|
return 0;
|
|
}
|
|
|
|
log_err("Couldn't find device with uuid '%s'.", buffer);
|
|
return 0;
|
|
}
|
|
|
|
if (!(pv->vg_name = pool_strdup(mem, vg->name))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(cn = find_config_node(pvn, "status", '/'))) {
|
|
log_err("Couldn't find status flags for physical volume.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(read_flags(&pv->status, PV_FLAGS, cn->v))) {
|
|
log_err("Couldn't read status flags for physical volume.");
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_int64(pvn, "pe_start", &pv->pe_start)) {
|
|
log_err("Couldn't read extent size for volume group.");
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_int32(pvn, "pe_count", &pv->pe_count)) {
|
|
log_err("Couldn't find extent count (pe_count) for "
|
|
"physical volume.");
|
|
return 0;
|
|
}
|
|
|
|
/* adjust the volume group. */
|
|
vg->extent_count += pv->pe_count;
|
|
vg->free_count += pv->pe_count;
|
|
|
|
pv->pe_size = vg->extent_size;
|
|
pv->size = pv->pe_size * (uint64_t) pv->pe_count;
|
|
pv->pe_allocated = 0;
|
|
|
|
vg->pv_count++;
|
|
list_add(&vg->pvs, &pvl->list);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void _insert_segment(struct logical_volume *lv,
|
|
struct stripe_segment *seg)
|
|
{
|
|
struct list *segh;
|
|
struct stripe_segment *comp;
|
|
|
|
list_iterate (segh, &lv->segments) {
|
|
comp = list_item(segh, struct stripe_segment);
|
|
|
|
if (comp->le > seg->le) {
|
|
list_add(&comp->list, &seg->list);
|
|
return;
|
|
}
|
|
}
|
|
|
|
lv->le_count += seg->len;
|
|
list_add(&lv->segments, &seg->list);
|
|
}
|
|
|
|
static int _read_segment(struct pool *mem, struct volume_group *vg,
|
|
struct logical_volume *lv, struct config_node *sn,
|
|
struct hash_table *pv_hash)
|
|
{
|
|
int s;
|
|
uint32_t stripes;
|
|
struct stripe_segment *seg;
|
|
struct config_node *cn;
|
|
struct config_value *cv;
|
|
const char *seg_name = sn->key;
|
|
|
|
if (!(sn = sn->child)) {
|
|
log_err("Empty segment section.");
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_int32(sn, "stripes", &stripes)) {
|
|
log_err("Couldn't read 'stripes' for segment '%s'.",
|
|
sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if (!(seg = pool_zalloc(mem, sizeof(*seg) +
|
|
(sizeof(seg->area[0]) * stripes)))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
seg->stripes = stripes;
|
|
|
|
if (!_read_int32(sn, "start_extent", &seg->le)) {
|
|
log_err("Couldn't read 'start_extent' for segment '%s'.",
|
|
sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_int32(sn, "extent_count", &seg->len)) {
|
|
log_err("Couldn't read 'extent_count' for segment '%s'.",
|
|
sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if (seg->stripes == 0) {
|
|
log_err("Zero stripes is *not* allowed for segment '%s'.",
|
|
sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if ((seg->stripes != 1) &&
|
|
!_read_int32(sn, "stripe_size", &seg->stripe_size)) {
|
|
log_err("Couldn't read 'stripe_size' for segment '%s'.",
|
|
sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if (!(cn = find_config_node(sn, "areas", '/'))) {
|
|
log_err("Couldn't find 'areas' array for segment '%s'.",
|
|
sn->key);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the stripes from the 'areas' array.
|
|
* FIXME: we could move this to a separate function.
|
|
*/
|
|
for (cv = cn->v, s = 0; cv && s < seg->stripes; s++, cv = cv->next) {
|
|
|
|
/* first we read the pv */
|
|
const char *bad = "Badly formed areas array for segment '%s'.";
|
|
struct physical_volume *pv;
|
|
uint32_t allocated;
|
|
|
|
if (cv->type != CFG_STRING) {
|
|
log_err(bad, sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if (!(pv = hash_lookup(pv_hash, cv->v.str))) {
|
|
log_err("Couldn't find physical volume '%s' for "
|
|
"segment '%s'.",
|
|
cn->v->v.str ? cn->v->v.str : "NULL",
|
|
seg_name);
|
|
return 0;
|
|
}
|
|
|
|
seg->area[s].pv = pv;
|
|
|
|
if (!(cv = cv->next)) {
|
|
log_err(bad, sn->key);
|
|
return 0;
|
|
}
|
|
|
|
if (cv->type != CFG_INT) {
|
|
log_err(bad, sn->key);
|
|
return 0;
|
|
}
|
|
|
|
seg->area[s].pe = cv->v.i;
|
|
|
|
/*
|
|
* Adjust the extent counts in the pv and vg.
|
|
*/
|
|
allocated = seg->len / seg->stripes;
|
|
pv->pe_allocated += allocated;
|
|
vg->free_count -= allocated;
|
|
}
|
|
|
|
/*
|
|
* Check we read the correct number of stripes.
|
|
*/
|
|
if (cv || (s < seg->stripes)) {
|
|
log_err("Incorrect number of stripes in 'area' array "
|
|
"for segment '%s'.", seg_name);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Insert into correct part of segment list.
|
|
*/
|
|
_insert_segment(lv, seg);
|
|
return 1;
|
|
}
|
|
|
|
static int _read_segments(struct pool *mem, struct volume_group *vg,
|
|
struct logical_volume *lv, struct config_node *lvn,
|
|
struct hash_table *pv_hash)
|
|
{
|
|
struct config_node *sn;
|
|
int count = 0, seg_count;
|
|
|
|
for (sn = lvn; sn; sn = sn->sib) {
|
|
|
|
/*
|
|
* All sub-sections are assumed to be segments.
|
|
*/
|
|
if (!sn->v) {
|
|
if (!_read_segment(mem, vg, lv, sn, pv_hash)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
count++;
|
|
}
|
|
}
|
|
|
|
if (!_read_int32(lvn, "segment_count", &seg_count)) {
|
|
log_err("Couldn't read segment count for logical volume.");
|
|
return 0;
|
|
}
|
|
|
|
if (seg_count != count) {
|
|
log_err("segment_count and actual number of segments "
|
|
"disagree.");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check there are no gaps or overlaps in the lv.
|
|
*/
|
|
if (!lv_check_segments(lv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Merge segments in case someones been editing things by hand.
|
|
*/
|
|
if (!lv_merge_segments(lv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _read_lv(struct pool *mem,
|
|
struct volume_group *vg, struct config_node *lvn,
|
|
struct config_node *vgn, struct hash_table *pv_hash,
|
|
struct uuid_map *um)
|
|
{
|
|
struct logical_volume *lv;
|
|
struct lv_list *lvl;
|
|
struct config_node *cn;
|
|
|
|
if (!(lvl = pool_zalloc(mem, sizeof(*lvl))) ||
|
|
!(lvl->lv = pool_zalloc(mem, sizeof(*lvl->lv)))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
lv = lvl->lv;
|
|
|
|
if (!(lv->name = pool_strdup(mem, lvn->key))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(lvn = lvn->child)) {
|
|
log_err("Empty logical volume section.");
|
|
return 0;
|
|
}
|
|
|
|
lv->vg = vg;
|
|
|
|
/* FIXME: read full lvid */
|
|
if (!_read_id(&lv->lvid.id[1], lvn, "id")) {
|
|
log_err("Couldn't read uuid for logical volume %s.",
|
|
lv->name);
|
|
return 0;
|
|
}
|
|
|
|
memcpy(&lv->lvid.id[0], &lv->vg->id, sizeof(lv->lvid.id[0]));
|
|
|
|
if (!(cn = find_config_node(lvn, "status", '/'))) {
|
|
log_err("Couldn't find status flags for logical volume.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(read_flags(&lv->status, LV_FLAGS, cn->v))) {
|
|
log_err("Couldn't read status flags for logical volume.");
|
|
return 0;
|
|
}
|
|
|
|
lv->minor = -1;
|
|
if ((lv->status & FIXED_MINOR) &&
|
|
!_read_int32(lvn, "minor", &lv->minor)) {
|
|
log_error("Couldn't read 'minor' value for logical volume.");
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_int32(lvn, "read_ahead", &lv->read_ahead)) {
|
|
log_err("Couldn't read 'read_ahead' value for "
|
|
"logical volume.");
|
|
return 0;
|
|
}
|
|
|
|
list_init(&lv->segments);
|
|
if (!_read_segments(mem, vg, lv, lvn, pv_hash)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
lv->size = (uint64_t) lv->le_count * (uint64_t) vg->extent_size;
|
|
|
|
vg->lv_count++;
|
|
list_add(&vg->lvs, &lvl->list);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _read_snapshot(struct pool *mem,
|
|
struct volume_group *vg, struct config_node *sn,
|
|
struct config_node *vgn, struct hash_table *pv_hash,
|
|
struct uuid_map *um)
|
|
{
|
|
uint32_t chunk_size;
|
|
const char *org_name, *cow_name;
|
|
struct logical_volume *org, *cow;
|
|
|
|
if (!(sn = sn->child)) {
|
|
log_err("Empty snapshot section.");
|
|
return 0;
|
|
}
|
|
|
|
if (!_read_uint32(sn, "chunk_size", &chunk_size)) {
|
|
log_err("Couldn't read chunk size for snapshot.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(cow_name = find_config_str(sn, "cow_store", '/', NULL))) {
|
|
log_err("Snapshot cow storage not specified.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(org_name = find_config_str(sn, "origin", '/', NULL))) {
|
|
log_err("Snapshot origin not specified.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(cow = find_lv(vg, cow_name))) {
|
|
log_err("Unknown logical volume specified for "
|
|
"snapshot cow store.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(org = find_lv(vg, org_name))) {
|
|
log_err("Unknown logical volume specified for "
|
|
"snapshot origin.");
|
|
return 0;
|
|
}
|
|
|
|
if (!vg_add_snapshot(org, cow, 1, chunk_size)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _read_sections(const char *section, section_fn fn,
|
|
struct pool *mem,
|
|
struct volume_group *vg, struct config_node *vgn,
|
|
struct hash_table *pv_hash,
|
|
struct uuid_map *um,
|
|
int optional)
|
|
{
|
|
struct config_node *n;
|
|
|
|
if (!(n = find_config_node(vgn, section, '/'))) {
|
|
if (!optional) {
|
|
log_err("Couldn't find section '%s'.", section);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
for (n = n->child; n; n = n->sib) {
|
|
if (!fn(mem, vg, n, vgn, pv_hash, um)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct volume_group *_read_vg(struct cmd_context *cmd,
|
|
struct config_file *cf,
|
|
struct uuid_map *um)
|
|
{
|
|
struct config_node *vgn, *cn;
|
|
struct volume_group *vg;
|
|
struct hash_table *pv_hash = NULL;
|
|
struct pool *mem = cmd->mem;
|
|
|
|
/* skip any top-level values */
|
|
for (vgn = cf->root; (vgn && vgn->v); vgn = vgn->sib)
|
|
;
|
|
|
|
if (!vgn) {
|
|
log_err("Couldn't find volume group in file.");
|
|
return NULL;
|
|
}
|
|
|
|
if (!(vg = pool_zalloc(mem, sizeof(*vg)))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
vg->cmd = cmd;
|
|
|
|
if (!(vg->name = pool_strdup(mem, vgn->key))) {
|
|
stack;
|
|
goto bad;
|
|
}
|
|
|
|
if (!(vg->system_id = pool_zalloc(mem, NAME_LEN))) {
|
|
stack;
|
|
goto bad;
|
|
}
|
|
|
|
vgn = vgn->child;
|
|
|
|
if ((cn = find_config_node(vgn, "system_id", '/')) && cn->v) {
|
|
if (!cn->v->v.str) {
|
|
log_error("system_id must be a string");
|
|
goto bad;
|
|
}
|
|
strncpy(vg->system_id, cn->v->v.str, NAME_LEN);
|
|
}
|
|
|
|
if (!_read_id(&vg->id, vgn, "id")) {
|
|
log_err("Couldn't read uuid for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
if (!(cn = find_config_node(vgn, "status", '/'))) {
|
|
log_err("Couldn't find status flags for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
if (!(read_flags(&vg->status, VG_FLAGS, cn->v))) {
|
|
log_err("Couldn't read status flags for volume group %s.",
|
|
vg->name);
|
|
goto bad;
|
|
}
|
|
|
|
if (!_read_int32(vgn, "extent_size", &vg->extent_size)) {
|
|
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("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("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("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);
|
|
|
|
/*
|
|
* 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 cmd_context *cmd,
|
|
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(cmd, cf, um))) {
|
|
stack;
|
|
goto out;
|
|
}
|
|
|
|
vg->cmd = cmd;
|
|
|
|
_read_desc(cmd->mem, cf, when, desc);
|
|
|
|
out:
|
|
destroy_config_file(cf);
|
|
return vg;
|
|
}
|