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lvm2/tools/toollib.c
Alasdair Kergon 7424de5b77 Allow signed mirrors arguments. 
Move create_mirror_log() into toollib.
2005-11-28 21:00:37 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tools.h"
#include "lv_alloc.h"
#include <sys/stat.h>
#include <sys/wait.h>
/*
* Metadata iteration functions
*/
int process_each_lv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
struct list *arg_lvnames, struct list *tags,
void *handle,
int (*process_single) (struct cmd_context * cmd,
struct logical_volume * lv,
void *handle))
{
int ret_max = 0;
int ret = 0;
int process_all = 0;
int process_lv = 0;
int tags_supplied = 0;
int lvargs_supplied = 0;
int lvargs_matched = 0;
struct lv_list *lvl;
if (vg->status & EXPORTED_VG) {
log_error("Volume group \"%s\" is exported", vg->name);
return ECMD_FAILED;
}
if (tags && !list_empty(tags))
tags_supplied = 1;
if (arg_lvnames && !list_empty(arg_lvnames))
lvargs_supplied = 1;
/* Process all LVs in this VG if no restrictions given */
if (!tags_supplied && !lvargs_supplied)
process_all = 1;
/* Or if VG tags match */
if (!process_lv && tags_supplied &&
str_list_match_list(tags, &vg->tags)) {
process_all = 1;
}
list_iterate_items(lvl, &vg->lvs) {
if (lvl->lv->status & SNAPSHOT)
continue;
/* Should we process this LV? */
if (process_all)
process_lv = 1;
else
process_lv = 0;
/* LV tag match? */
if (!process_lv && tags_supplied &&
str_list_match_list(tags, &lvl->lv->tags)) {
process_lv = 1;
}
/* LV name match? */
if (lvargs_supplied &&
str_list_match_item(arg_lvnames, lvl->lv->name)) {
process_lv = 1;
lvargs_matched++;
}
if (!process_lv)
continue;
ret = process_single(cmd, lvl->lv, handle);
if (ret > ret_max)
ret_max = ret;
}
if (lvargs_supplied && lvargs_matched != list_size(arg_lvnames)) {
log_error("One or more specified logical volume(s) not found.");
if (ret_max < ECMD_FAILED)
ret_max = ECMD_FAILED;
}
return ret_max;
}
int process_each_lv(struct cmd_context *cmd, int argc, char **argv,
int lock_type, void *handle,
int (*process_single) (struct cmd_context * cmd,
struct logical_volume * lv,
void *handle))
{
int opt = 0;
int ret_max = 0;
int ret = 0;
int consistent;
struct list *tags_arg;
struct list *vgnames; /* VGs to process */
struct str_list *sll, *strl;
struct volume_group *vg;
struct list tags, lvnames;
struct list arg_lvnames; /* Cmdline vgname or vgname/lvname */
char *vglv;
size_t vglv_sz;
const char *vgname;
list_init(&tags);
list_init(&arg_lvnames);
if (argc) {
struct list arg_vgnames;
log_verbose("Using logical volume(s) on command line");
list_init(&arg_vgnames);
for (; opt < argc; opt++) {
const char *lv_name = argv[opt];
char *vgname_def;
int dev_dir_found = 0;
/* Do we have a tag or vgname or lvname? */
vgname = lv_name;
if (*vgname == '@') {
if (!validate_name(vgname + 1)) {
log_error("Skipping invalid tag %s",
vgname);
continue;
}
if (!str_list_add(cmd->mem, &tags,
dm_pool_strdup(cmd->mem,
vgname + 1))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
continue;
}
/* FIXME Jumbled parsing */
if (*vgname == '/') {
while (*vgname == '/')
vgname++;
vgname--;
}
if (!strncmp(vgname, cmd->dev_dir,
strlen(cmd->dev_dir))) {
vgname += strlen(cmd->dev_dir);
dev_dir_found = 1;
while (*vgname == '/')
vgname++;
}
if (*vgname == '/') {
log_error("\"%s\": Invalid path for Logical "
"Volume", argv[opt]);
if (ret_max < ECMD_FAILED)
ret_max = ECMD_FAILED;
continue;
}
lv_name = vgname;
if (strchr(vgname, '/')) {
/* Must be an LV */
lv_name = strchr(vgname, '/');
while (*lv_name == '/')
lv_name++;
if (!(vgname = extract_vgname(cmd, vgname))) {
if (ret_max < ECMD_FAILED)
ret_max = ECMD_FAILED;
continue;
}
} else if (!dev_dir_found &&
(vgname_def = default_vgname(cmd))) {
vgname = vgname_def;
} else
lv_name = NULL;
if (!str_list_add(cmd->mem, &arg_vgnames,
dm_pool_strdup(cmd->mem, vgname))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
if (!lv_name) {
if (!str_list_add(cmd->mem, &arg_lvnames,
dm_pool_strdup(cmd->mem,
vgname))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
} else {
vglv_sz = strlen(vgname) + strlen(lv_name) + 2;
if (!(vglv = dm_pool_alloc(cmd->mem, vglv_sz)) ||
lvm_snprintf(vglv, vglv_sz, "%s/%s", vgname,
lv_name) < 0) {
log_error("vg/lv string alloc failed");
return ECMD_FAILED;
}
if (!str_list_add(cmd->mem, &arg_lvnames, vglv)) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
}
}
vgnames = &arg_vgnames;
}
if (!argc || !list_empty(&tags)) {
log_verbose("Finding all logical volumes");
if (!(vgnames = get_vgs(cmd, 0)) || list_empty(vgnames)) {
log_error("No volume groups found");
return ret_max;
}
}
list_iterate_items(strl, vgnames) {
vgname = strl->str;
if (!vgname || !*vgname)
continue; /* FIXME Unnecessary? */
if (!lock_vol(cmd, vgname, lock_type)) {
log_error("Can't lock %s: skipping", vgname);
continue;
}
if (lock_type & LCK_WRITE)
consistent = 1;
else
consistent = 0;
if (!(vg = vg_read(cmd, vgname, &consistent)) || !consistent) {
unlock_vg(cmd, vgname);
if (!vg)
log_error("Volume group \"%s\" "
"not found", vgname);
else
log_error("Volume group \"%s\" "
"inconsistent", vgname);
if (!vg || !(vg = recover_vg(cmd, vgname, lock_type))) {
unlock_vg(cmd, vgname);
if (ret_max < ECMD_FAILED)
ret_max = ECMD_FAILED;
continue;
}
}
tags_arg = &tags;
list_init(&lvnames); /* LVs to be processed in this VG */
list_iterate_items(sll, &arg_lvnames) {
const char *vg_name = sll->str;
const char *lv_name = strchr(vg_name, '/');
if ((!lv_name && !strcmp(vg_name, vgname))) {
/* Process all LVs in this VG */
tags_arg = NULL;
list_init(&lvnames);
break;
} else if (!strncmp(vg_name, vgname, strlen(vgname)) &&
strlen(vgname) == lv_name - vg_name) {
if (!str_list_add(cmd->mem, &lvnames,
dm_pool_strdup(cmd->mem,
lv_name + 1))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
}
}
ret = process_each_lv_in_vg(cmd, vg, &lvnames, tags_arg,
handle, process_single);
unlock_vg(cmd, vgname);
if (ret > ret_max)
ret_max = ret;
}
return ret_max;
}
int process_each_segment_in_pv(struct cmd_context *cmd,
struct volume_group *vg,
struct physical_volume *pv,
void *handle,
int (*process_single) (struct cmd_context * cmd,
struct volume_group * vg,
struct pv_segment * pvseg,
void *handle))
{
struct pv_segment *pvseg;
int ret_max = 0;
int ret;
list_iterate_items(pvseg, &pv->segments) {
ret = process_single(cmd, vg, pvseg, handle);
if (ret > ret_max)
ret_max = ret;
}
return ret_max;
}
int process_each_segment_in_lv(struct cmd_context *cmd,
struct logical_volume *lv,
void *handle,
int (*process_single) (struct cmd_context * cmd,
struct lv_segment * seg,
void *handle))
{
struct lv_segment *seg;
int ret_max = 0;
int ret;
list_iterate_items(seg, &lv->segments) {
ret = process_single(cmd, seg, handle);
if (ret > ret_max)
ret_max = ret;
}
return ret_max;
}
static int _process_one_vg(struct cmd_context *cmd, const char *vg_name,
struct list *tags, struct list *arg_vgnames,
int lock_type, int consistent, void *handle,
int ret_max,
int (*process_single) (struct cmd_context * cmd,
const char *vg_name,
struct volume_group * vg,
int consistent, void *handle))
{
struct volume_group *vg;
int ret = 0;
if (!lock_vol(cmd, vg_name, lock_type)) {
log_error("Can't lock %s: skipping", vg_name);
return ret_max;
}
log_verbose("Finding volume group \"%s\"", vg_name);
vg = vg_read(cmd, vg_name, &consistent);
if (!list_empty(tags)) {
/* Only process if a tag matches or it's on arg_vgnames */
if (!str_list_match_item(arg_vgnames, vg_name) &&
!str_list_match_list(tags, &vg->tags)) {
unlock_vg(cmd, vg_name);
return ret_max;
}
}
if ((ret = process_single(cmd, vg_name, vg, consistent,
handle)) > ret_max) {
ret_max = ret;
}
unlock_vg(cmd, vg_name);
return ret_max;
}
int process_each_vg(struct cmd_context *cmd, int argc, char **argv,
int lock_type, int consistent, void *handle,
int (*process_single) (struct cmd_context * cmd,
const char *vg_name,
struct volume_group * vg,
int consistent, void *handle))
{
int opt = 0;
int ret_max = 0;
struct str_list *sl;
struct list *vgnames;
struct list arg_vgnames, tags;
const char *vg_name;
char *dev_dir = cmd->dev_dir;
list_init(&tags);
list_init(&arg_vgnames);
if (argc) {
log_verbose("Using volume group(s) on command line");
for (; opt < argc; opt++) {
vg_name = argv[opt];
if (*vg_name == '@') {
if (!validate_name(vg_name + 1)) {
log_error("Skipping invalid tag %s",
vg_name);
continue;
}
if (!str_list_add(cmd->mem, &tags,
dm_pool_strdup(cmd->mem,
vg_name + 1))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
continue;
}
if (*vg_name == '/') {
while (*vg_name == '/')
vg_name++;
vg_name--;
}
if (!strncmp(vg_name, dev_dir, strlen(dev_dir)))
vg_name += strlen(dev_dir);
if (strchr(vg_name, '/')) {
log_error("Invalid volume group name: %s",
vg_name);
continue;
}
if (!str_list_add(cmd->mem, &arg_vgnames,
dm_pool_strdup(cmd->mem, vg_name))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
}
vgnames = &arg_vgnames;
}
if (!argc || !list_empty(&tags)) {
log_verbose("Finding all volume groups");
if (!(vgnames = get_vgs(cmd, 0)) || list_empty(vgnames)) {
log_error("No volume groups found");
return ret_max;
}
}
list_iterate_items(sl, vgnames) {
vg_name = sl->str;
if (!vg_name || !*vg_name)
continue; /* FIXME Unnecessary? */
ret_max = _process_one_vg(cmd, vg_name, &tags, &arg_vgnames,
lock_type, consistent, handle,
ret_max, process_single);
}
return ret_max;
}
int process_each_pv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
struct list *tags, void *handle,
int (*process_single) (struct cmd_context * cmd,
struct volume_group * vg,
struct physical_volume * pv,
void *handle))
{
int ret_max = 0;
int ret = 0;
struct pv_list *pvl;
list_iterate_items(pvl, &vg->pvs) {
if (tags && !list_empty(tags) &&
!str_list_match_list(tags, &pvl->pv->tags)) {
continue;
}
if ((ret = process_single(cmd, vg, pvl->pv, handle)) > ret_max)
ret_max = ret;
}
return ret_max;
}
static int _process_all_devs(struct cmd_context *cmd, void *handle,
int (*process_single) (struct cmd_context * cmd,
struct volume_group * vg,
struct physical_volume * pv,
void *handle))
{
struct physical_volume *pv;
struct physical_volume pv_dummy;
struct dev_iter *iter;
struct device *dev;
int ret_max = 0;
int ret = 0;
if (!(iter = dev_iter_create(cmd->filter, 1))) {
log_error("dev_iter creation failed");
return ECMD_FAILED;
}
while ((dev = dev_iter_get(iter))) {
if (!(pv = pv_read(cmd, dev_name(dev), NULL, NULL, 0))) {
memset(&pv_dummy, 0, sizeof(pv_dummy));
list_init(&pv_dummy.tags);
list_init(&pv_dummy.segments);
pv_dummy.dev = dev;
pv_dummy.fmt = NULL;
pv = &pv_dummy;
}
ret = process_single(cmd, NULL, pv, handle);
if (ret > ret_max)
ret_max = ret;
}
dev_iter_destroy(iter);
return ret_max;
}
int process_each_pv(struct cmd_context *cmd, int argc, char **argv,
struct volume_group *vg, void *handle,
int (*process_single) (struct cmd_context * cmd,
struct volume_group * vg,
struct physical_volume * pv,
void *handle))
{
int opt = 0;
int ret_max = 0;
int ret = 0;
struct pv_list *pvl;
struct physical_volume *pv;
struct list *pvslist, *vgnames;
struct list tags;
struct str_list *sll;
char *tagname;
int consistent = 1;
list_init(&tags);
if (argc) {
log_verbose("Using physical volume(s) on command line");
for (; opt < argc; opt++) {
if (*argv[opt] == '@') {
tagname = argv[opt] + 1;
if (!validate_name(tagname)) {
log_error("Skipping invalid tag %s",
tagname);
if (ret_max < EINVALID_CMD_LINE)
ret_max = EINVALID_CMD_LINE;
continue;
}
if (!str_list_add(cmd->mem, &tags,
dm_pool_strdup(cmd->mem,
tagname))) {
log_error("strlist allocation failed");
return ECMD_FAILED;
}
continue;
}
if (vg) {
if (!(pvl = find_pv_in_vg(vg, argv[opt]))) {
log_error("Physical Volume \"%s\" not "
"found in Volume Group "
"\"%s\"", argv[opt],
vg->name);
ret_max = ECMD_FAILED;
continue;
}
pv = pvl->pv;
} else {
if (!(pv = pv_read(cmd, argv[opt], NULL,
NULL, 1))) {
log_error("Failed to read physical "
"volume \"%s\"", argv[opt]);
ret_max = ECMD_FAILED;
continue;
}
}
ret = process_single(cmd, vg, pv, handle);
if (ret > ret_max)
ret_max = ret;
}
if (!list_empty(&tags) && (vgnames = get_vgs(cmd, 0)) &&
!list_empty(vgnames)) {
list_iterate_items(sll, vgnames) {
vg = vg_read(cmd, sll->str, &consistent);
if (!consistent)
continue;
ret = process_each_pv_in_vg(cmd, vg, &tags,
handle,
process_single);
if (ret > ret_max)
ret_max = ret;
}
}
} else {
if (vg) {
log_verbose("Using all physical volume(s) in "
"volume group");
ret = process_each_pv_in_vg(cmd, vg, NULL, handle,
process_single);
if (ret > ret_max)
ret_max = ret;
} else if (arg_count(cmd, all_ARG)) {
ret = _process_all_devs(cmd, handle, process_single);
if (ret > ret_max)
ret_max = ret;
} else {
log_verbose("Scanning for physical volume names");
if (!(pvslist = get_pvs(cmd)))
return ECMD_FAILED;
list_iterate_items(pvl, pvslist) {
ret = process_single(cmd, NULL, pvl->pv,
handle);
if (ret > ret_max)
ret_max = ret;
}
}
}
return ret_max;
}
/*
* Determine volume group name from a logical volume name
*/
const char *extract_vgname(struct cmd_context *cmd, const char *lv_name)
{
const char *vg_name = lv_name;
char *st;
char *dev_dir = cmd->dev_dir;
int dev_dir_provided = 0;
/* Path supplied? */
if (vg_name && strchr(vg_name, '/')) {
/* Strip dev_dir (optional) */
if (*vg_name == '/') {
while (*vg_name == '/')
vg_name++;
vg_name--;
}
if (!strncmp(vg_name, dev_dir, strlen(dev_dir))) {
vg_name += strlen(dev_dir);
dev_dir_provided = 1;
while (*vg_name == '/')
vg_name++;
}
if (*vg_name == '/') {
log_error("\"%s\": Invalid path for Logical "
"Volume", lv_name);
return 0;
}
/* Require exactly one set of consecutive slashes */
if ((st = strchr(vg_name, '/')))
while (*st == '/')
st++;
if (!strchr(vg_name, '/') || strchr(st, '/')) {
log_error("\"%s\": Invalid path for Logical Volume",
lv_name);
return 0;
}
vg_name = dm_pool_strdup(cmd->mem, vg_name);
if (!vg_name) {
log_error("Allocation of vg_name failed");
return 0;
}
*strchr(vg_name, '/') = '\0';
return vg_name;
}
if (!(vg_name = default_vgname(cmd))) {
if (lv_name)
log_error("Path required for Logical Volume \"%s\"",
lv_name);
return 0;
}
return vg_name;
}
/*
* Extract default volume group name from environment
*/
char *default_vgname(struct cmd_context *cmd)
{
char *vg_path;
char *dev_dir = cmd->dev_dir;
/* Take default VG from environment? */
vg_path = getenv("LVM_VG_NAME");
if (!vg_path)
return 0;
/* Strip dev_dir (optional) */
if (*vg_path == '/') {
while (*vg_path == '/')
vg_path++;
vg_path--;
}
if (!strncmp(vg_path, dev_dir, strlen(dev_dir)))
vg_path += strlen(dev_dir);
if (strchr(vg_path, '/')) {
log_error("Environment Volume Group in LVM_VG_NAME invalid: "
"\"%s\"", vg_path);
return 0;
}
return dm_pool_strdup(cmd->mem, vg_path);
}
/*
* Process physical extent range specifiers
*/
static int _add_pe_range(struct dm_pool *mem, struct list *pe_ranges,
uint32_t start, uint32_t count)
{
struct pe_range *per;
log_debug("Adding PE range: start PE %" PRIu32 " length %" PRIu32,
start, count);
/* Ensure no overlap with existing areas */
list_iterate_items(per, pe_ranges) {
if (((start < per->start) && (start + count - 1 >= per->start))
|| ((start >= per->start) &&
(per->start + per->count - 1) >= start)) {
log_error("Overlapping PE ranges detected (%" PRIu32
"-%" PRIu32 ", %" PRIu32 "-%" PRIu32 ")",
start, start + count - 1, per->start,
per->start + per->count - 1);
return 0;
}
}
if (!(per = dm_pool_alloc(mem, sizeof(*per)))) {
log_error("Allocation of list failed");
return 0;
}
per->start = start;
per->count = count;
list_add(pe_ranges, &per->list);
return 1;
}
static int _parse_pes(struct dm_pool *mem, char *c, struct list *pe_ranges,
uint32_t size)
{
char *endptr;
uint32_t start, end;
/* Default to whole PV */
if (!c) {
if (!_add_pe_range(mem, pe_ranges, UINT32_C(0), size)) {
stack;
return 0;
}
return 1;
}
while (*c) {
if (*c != ':')
goto error;
c++;
/* Disallow :: and :\0 */
if (*c == ':' || !*c)
goto error;
/* Default to whole range */
start = UINT32_C(0);
end = size - 1;
/* Start extent given? */
if (isdigit(*c)) {
start = (uint32_t) strtoul(c, &endptr, 10);
if (endptr == c)
goto error;
c = endptr;
/* Just one number given? */
if (!*c || *c == ':')
end = start;
}
/* Range? */
if (*c == '-') {
c++;
if (isdigit(*c)) {
end = (uint32_t) strtoul(c, &endptr, 10);
if (endptr == c)
goto error;
c = endptr;
}
}
if (*c && *c != ':')
goto error;
if ((start > end) || (end > size - 1)) {
log_error("PE range error: start extent %" PRIu32 " to "
"end extent %" PRIu32, start, end);
return 0;
}
if (!_add_pe_range(mem, pe_ranges, start, end - start + 1)) {
stack;
return 0;
}
}
return 1;
error:
log_error("Physical extent parsing error at %s", c);
return 0;
}
static void _create_pv_entry(struct dm_pool *mem, struct pv_list *pvl,
char *colon, int allocatable_only, struct list *r)
{
const char *pvname;
struct pv_list *new_pvl;
struct list *pe_ranges;
pvname = dev_name(pvl->pv->dev);
if (allocatable_only && !(pvl->pv->status & ALLOCATABLE_PV)) {
log_error("Physical volume %s not allocatable", pvname);
return;
}
if (allocatable_only &&
(pvl->pv->pe_count == pvl->pv->pe_alloc_count)) {
log_err("No free extents on physical volume \"%s\"", pvname);
return;
}
if (!(new_pvl = dm_pool_alloc(mem, sizeof(*new_pvl)))) {
log_err("Unable to allocate physical volume list.");
return;
}
memcpy(new_pvl, pvl, sizeof(*new_pvl));
if (!(pe_ranges = dm_pool_alloc(mem, sizeof(*pe_ranges)))) {
log_error("Allocation of pe_ranges list failed");
return;
}
list_init(pe_ranges);
/* Determine selected physical extents */
if (!_parse_pes(mem, colon, pe_ranges, pvl->pv->pe_count)) {
stack;
return;
}
new_pvl->pe_ranges = pe_ranges;
list_add(r, &new_pvl->list);
}
struct list *create_pv_list(struct dm_pool *mem, struct volume_group *vg, int argc,
char **argv, int allocatable_only)
{
struct list *r;
struct pv_list *pvl;
struct list tags, arg_pvnames;
const char *pvname = NULL;
char *colon, *tagname;
int i;
/* Build up list of PVs */
if (!(r = dm_pool_alloc(mem, sizeof(*r)))) {
log_error("Allocation of list failed");
return NULL;
}
list_init(r);
list_init(&tags);
list_init(&arg_pvnames);
for (i = 0; i < argc; i++) {
if (*argv[i] == '@') {
tagname = argv[i] + 1;
if (!validate_name(tagname)) {
log_error("Skipping invalid tag %s", tagname);
continue;
}
list_iterate_items(pvl, &vg->pvs) {
if (str_list_match_item(&pvl->pv->tags,
tagname)) {
_create_pv_entry(mem, pvl, NULL,
allocatable_only, r);
}
}
continue;
}
pvname = argv[i];
if ((colon = strchr(pvname, ':'))) {
if (!(pvname = dm_pool_strndup(mem, pvname,
(unsigned) (colon -
pvname)))) {
log_error("Failed to clone PV name");
return NULL;
}
}
if (!(pvl = find_pv_in_vg(vg, pvname))) {
log_err("Physical Volume \"%s\" not found in "
"Volume Group \"%s\"", pvname, vg->name);
return NULL;
}
_create_pv_entry(mem, pvl, colon, allocatable_only, r);
}
if (list_empty(r))
log_error("No specified PVs have space available");
return list_empty(r) ? NULL : r;
}
struct list *clone_pv_list(struct dm_pool *mem, struct list *pvsl)
{
struct list *r;
struct pv_list *pvl, *new_pvl;
/* Build up list of PVs */
if (!(r = dm_pool_alloc(mem, sizeof(*r)))) {
log_error("Allocation of list failed");
return NULL;
}
list_init(r);
list_iterate_items(pvl, pvsl) {
if (!(new_pvl = dm_pool_zalloc(mem, sizeof(*new_pvl)))) {
log_error("Unable to allocate physical volume list.");
return NULL;
}
memcpy(new_pvl, pvl, sizeof(*new_pvl));
list_add(r, &new_pvl->list);
}
return r;
}
/*
* Attempt metadata recovery
*/
struct volume_group *recover_vg(struct cmd_context *cmd, const char *vgname,
int lock_type)
{
int consistent = 1;
lock_type &= ~LCK_TYPE_MASK;
lock_type |= LCK_WRITE;
if (!lock_vol(cmd, vgname, lock_type)) {
log_error("Can't lock %s for metadata recovery: skipping",
vgname);
return NULL;
}
return vg_read(cmd, vgname, &consistent);
}
int apply_lvname_restrictions(const char *name)
{
if (!strncmp(name, "snapshot", 8)) {
log_error("Names starting \"snapshot\" are reserved. "
"Please choose a different LV name.");
return 0;
}
if (!strncmp(name, "pvmove", 6)) {
log_error("Names starting \"pvmove\" are reserved. "
"Please choose a different LV name.");
return 0;
}
if (strstr(name, "_mlog")) {
log_error("Names including \"_mlog\" are reserved. "
"Please choose a different LV name.");
return 0;
}
if (strstr(name, "_mimage")) {
log_error("Names including \"_mimage\" are reserved. "
"Please choose a different LV name.");
return 0;
}
return 1;
}
int validate_vg_name(struct cmd_context *cmd, const char *vg_name)
{
char vg_path[PATH_MAX];
if (!validate_name(vg_name))
return 0;
snprintf(vg_path, PATH_MAX, "%s%s", cmd->dev_dir, vg_name);
if (path_exists(vg_path)) {
log_error("%s: already exists in filesystem", vg_path);
return 0;
}
return 1;
}
int generate_log_name_format(struct volume_group *vg, const char *lv_name,
char *buffer, size_t size)
{
if (lvm_snprintf(buffer, size, "%s_mlog", lv_name) < 0) {
stack;
return 0;
}
if (find_lv_in_vg(vg, buffer) &&
lvm_snprintf(buffer, size, "%s_mlog_%%d",
lv_name) < 0) {
stack;
return 0;
}
return 1;
}
/*
* Volumes may be zeroed to remove old application data.
*/
int zero_lv(struct cmd_context *cmd, struct logical_volume *lv)
{
struct device *dev;
char *name;
/*
* FIXME:
* <clausen> also, more than 4k
* <clausen> say, reiserfs puts it's superblock 32k in, IIRC
* <ejt_> k, I'll drop a fixme to that effect
* (I know the device is at least 4k, but not 32k)
*/
if (!(name = dm_pool_alloc(cmd->mem, PATH_MAX))) {
log_error("Name allocation failed - device not zeroed");
return 0;
}
if (lvm_snprintf(name, PATH_MAX, "%s%s/%s", cmd->dev_dir,
lv->vg->name, lv->name) < 0) {
log_error("Name too long - device not zeroed (%s)", lv->name);
return 0;
}
log_verbose("Zeroing start of logical volume \"%s\"", lv->name);
if (!(dev = dev_cache_get(name, NULL))) {
log_error("%s: not found: device not zeroed", name);
return 0;
}
if (!dev_open_quiet(dev))
return 0;
dev_zero(dev, UINT64_C(0), (size_t) 4096);
dev_close_immediate(dev);
return 1;
}
struct logical_volume *create_mirror_log(struct cmd_context *cmd,
struct volume_group *vg,
struct alloc_handle *ah,
alloc_policy_t alloc,
const char *lv_name)
{
struct logical_volume *log_lv;
char *log_name;
size_t len;
len = strlen(lv_name) + 32;
if (!(log_name = alloca(len)) ||
!(generate_log_name_format(vg, lv_name, log_name, len))) {
log_error("log_name allocation failed. "
"Remove new LV and retry.");
return NULL;
}
if (!(log_lv = lv_create_empty(vg->fid, log_name, NULL,
VISIBLE_LV | LVM_READ | LVM_WRITE,
alloc, 0, vg))) {
stack;
return NULL;
}
if (!lv_add_log_segment(ah, log_lv)) {
stack;
goto error;
}
/* store mirror log on disk(s) */
if (!vg_write(vg)) {
stack;
goto error;
}
backup(vg);
if (!vg_commit(vg)) {
stack;
goto error;
}
if (!activate_lv(cmd, log_lv)) {
log_error("Aborting. Failed to activate mirror log. "
"Remove new LVs and retry.");
goto error;
}
if (activation() && !zero_lv(cmd, log_lv)) {
log_error("Aborting. Failed to wipe mirror log. "
"Remove new LV and retry.");
goto error;
}
if (!deactivate_lv(cmd, log_lv)) {
log_error("Aborting. Failed to deactivate mirror log. "
"Remove new LV and retry.");
goto error;
}
log_lv->status &= ~VISIBLE_LV;
return log_lv;
error:
/* FIXME Attempt to clean up. */
return NULL;
}
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