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1ea4c6d449
lvm2/lib/format_text/format-text.c
Zdenek Kabelac 1ea4c6d449 Add more strict const pointers around config tree 
To have better control were the config tree could be modified use more
const pointers and very carefully downcast them back to non-const
(for config tree merge).
2010-12-20 13:12:55 +00:00

2211 lines
57 KiB
C
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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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 Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser 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 "lib.h"
#include "format-text.h"
#include "import-export.h"
#include "device.h"
#include "lvm-file.h"
#include "config.h"
#include "display.h"
#include "toolcontext.h"
#include "lvm-string.h"
#include "uuid.h"
#include "layout.h"
#include "crc.h"
#include "xlate.h"
#include "label.h"
#include "memlock.h"
#include "lvmcache.h"
#include <unistd.h>
#include <sys/file.h>
#include <sys/param.h>
#include <limits.h>
#include <dirent.h>
#include <ctype.h>
static struct format_instance *_text_create_text_instance(const struct format_type
*fmt, const char *vgname,
const char *vgid,
void *context);
struct text_fid_context {
char *raw_metadata_buf;
uint32_t raw_metadata_buf_size;
};
struct dir_list {
struct dm_list list;
char dir[0];
};
struct raw_list {
struct dm_list list;
struct device_area dev_area;
};
struct text_context {
char *path_live; /* Path to file holding live metadata */
char *path_edit; /* Path to file holding edited metadata */
char *desc; /* Description placed inside file */
};
int rlocn_is_ignored(const struct raw_locn *rlocn)
{
return (rlocn->flags & RAW_LOCN_IGNORED ? 1 : 0);
}
void rlocn_set_ignored(struct raw_locn *rlocn, unsigned mda_ignored)
{
if (mda_ignored)
rlocn->flags |= RAW_LOCN_IGNORED;
else
rlocn->flags &= ~RAW_LOCN_IGNORED;
}
/*
* NOTE: Currently there can be only one vg per text file.
*/
static int _text_vg_setup(struct format_instance *fid __attribute__((unused)),
struct volume_group *vg)
{
if (vg->extent_size & (vg->extent_size - 1)) {
log_error("Extent size must be power of 2");
return 0;
}
return 1;
}
static uint64_t _mda_free_sectors_raw(struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
return mdac->free_sectors;
}
static uint64_t _mda_total_sectors_raw(struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
return mdac->area.size >> SECTOR_SHIFT;
}
/*
* Check if metadata area belongs to vg
*/
static int _mda_in_vg_raw(struct format_instance *fid __attribute__((unused)),
struct volume_group *vg, struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct pv_list *pvl;
dm_list_iterate_items(pvl, &vg->pvs)
if (pvl->pv->dev == mdac->area.dev)
return 1;
return 0;
}
static unsigned _mda_locns_match_raw(struct metadata_area *mda1,
struct metadata_area *mda2)
{
struct mda_context *mda1c = (struct mda_context *) mda1->metadata_locn;
struct mda_context *mda2c = (struct mda_context *) mda2->metadata_locn;
if ((mda1c->area.dev == mda2c->area.dev) &&
(mda1c->area.start == mda2c->area.start) &&
(mda1c->area.size == mda2c->area.size))
return 1;
return 0;
}
/*
* For circular region between region_start and region_start + region_size,
* back up one SECTOR_SIZE from 'region_ptr' and return the value.
* This allows reverse traversal through text metadata area to find old
* metadata.
*
* Parameters:
* region_start: start of the region (bytes)
* region_size: size of the region (bytes)
* region_ptr: pointer within the region (bytes)
* NOTE: region_start <= region_ptr <= region_start + region_size
*/
static uint64_t _get_prev_sector_circular(uint64_t region_start,
uint64_t region_size,
uint64_t region_ptr)
{
if (region_ptr >= region_start + SECTOR_SIZE)
return region_ptr - SECTOR_SIZE;
else
return (region_start + region_size - SECTOR_SIZE);
}
/*
* Analyze a metadata area for old metadata records in the circular buffer.
* This function just looks through and makes a first pass at the data in
* the sectors for particular things.
* FIXME: do something with each metadata area (try to extract vg, write
* raw data to file, etc)
*/
static int _pv_analyze_mda_raw (const struct format_type * fmt,
struct metadata_area *mda)
{
struct mda_header *mdah;
struct raw_locn *rlocn;
uint64_t area_start;
uint64_t area_size;
uint64_t prev_sector, prev_sector2;
uint64_t latest_mrec_offset;
uint64_t offset;
uint64_t offset2;
size_t size;
size_t size2;
char *buf=NULL;
struct device_area *area;
struct mda_context *mdac;
int r=0;
mdac = (struct mda_context *) mda->metadata_locn;
log_print("Found text metadata area: offset=%" PRIu64 ", size=%"
PRIu64, mdac->area.start, mdac->area.size);
area = &mdac->area;
if (!dev_open(area->dev))
return_0;
if (!(mdah = raw_read_mda_header(fmt, area)))
goto_out;
rlocn = mdah->raw_locns;
/*
* The device area includes the metadata header as well as the
* records, so remove the metadata header from the start and size
*/
area_start = area->start + MDA_HEADER_SIZE;
area_size = area->size - MDA_HEADER_SIZE;
latest_mrec_offset = rlocn->offset + area->start;
/*
* Start searching at rlocn (point of live metadata) and go
* backwards.
*/
prev_sector = _get_prev_sector_circular(area_start, area_size,
latest_mrec_offset);
offset = prev_sector;
size = SECTOR_SIZE;
offset2 = size2 = 0;
while (prev_sector != latest_mrec_offset) {
prev_sector2 = prev_sector;
prev_sector = _get_prev_sector_circular(area_start, area_size,
prev_sector);
if (prev_sector > prev_sector2)
goto_out;
/*
* FIXME: for some reason, the whole metadata region from
* area->start to area->start+area->size is not used.
* Only ~32KB seems to contain valid metadata records
* (LVM2 format - format_text). As a result, I end up with
* "maybe_config_section" returning true when there's no valid
* metadata in a sector (sectors with all nulls).
*/
if (!(buf = dm_pool_alloc(fmt->cmd->mem, size + size2)))
goto_out;
if (!dev_read_circular(area->dev, offset, size,
offset2, size2, buf))
goto_out;
/*
* FIXME: We could add more sophisticated metadata detection
*/
if (maybe_config_section(buf, size + size2)) {
/* FIXME: Validate region, pull out timestamp?, etc */
/* FIXME: Do something with this region */
log_verbose ("Found LVM2 metadata record at "
"offset=%"PRIu64", size=%"PRIsize_t", "
"offset2=%"PRIu64" size2=%"PRIsize_t,
offset, size, offset2, size2);
offset = prev_sector;
size = SECTOR_SIZE;
offset2 = size2 = 0;
} else {
/*
* Not a complete metadata record, assume we have
* metadata and just increase the size and offset.
* Start the second region if the previous sector is
* wrapping around towards the end of the disk.
*/
if (prev_sector > offset) {
offset2 = prev_sector;
size2 += SECTOR_SIZE;
} else {
offset = prev_sector;
size += SECTOR_SIZE;
}
}
dm_pool_free(fmt->cmd->mem, buf);
buf = NULL;
}
r = 1;
out:
if (buf)
dm_pool_free(fmt->cmd->mem, buf);
if (!dev_close(area->dev))
stack;
return r;
}
static int _text_lv_setup(struct format_instance *fid __attribute__((unused)),
struct logical_volume *lv)
{
/******** FIXME Any LV size restriction?
uint64_t max_size = UINT_MAX;
if (lv->size > max_size) {
char *dummy = display_size(max_size);
log_error("logical volumes cannot be larger than %s", dummy);
dm_free(dummy);
return 0;
}
*/
if (!*lv->lvid.s && !lvid_create(&lv->lvid, &lv->vg->id)) {
log_error("Random lvid creation failed for %s/%s.",
lv->vg->name, lv->name);
return 0;
}
return 1;
}
static void _xlate_mdah(struct mda_header *mdah)
{
struct raw_locn *rl;
mdah->version = xlate32(mdah->version);
mdah->start = xlate64(mdah->start);
mdah->size = xlate64(mdah->size);
rl = &mdah->raw_locns[0];
while (rl->offset) {
rl->checksum = xlate32(rl->checksum);
rl->offset = xlate64(rl->offset);
rl->size = xlate64(rl->size);
rl++;
}
}
struct mda_header *raw_read_mda_header(const struct format_type *fmt,
struct device_area *dev_area)
{
struct mda_header *mdah;
if (!(mdah = dm_pool_alloc(fmt->cmd->mem, MDA_HEADER_SIZE))) {
log_error("struct mda_header allocation failed");
return NULL;
}
if (!dev_read(dev_area->dev, dev_area->start, MDA_HEADER_SIZE, mdah))
goto_bad;
if (mdah->checksum_xl != xlate32(calc_crc(INITIAL_CRC, (uint8_t *)mdah->magic,
MDA_HEADER_SIZE -
sizeof(mdah->checksum_xl)))) {
log_error("Incorrect metadata area header checksum on %s"
" at offset %"PRIu64, dev_name(dev_area->dev),
dev_area->start);
goto bad;
}
_xlate_mdah(mdah);
if (strncmp((char *)mdah->magic, FMTT_MAGIC, sizeof(mdah->magic))) {
log_error("Wrong magic number in metadata area header on %s"
" at offset %"PRIu64, dev_name(dev_area->dev),
dev_area->start);
goto bad;
}
if (mdah->version != FMTT_VERSION) {
log_error("Incompatible metadata area header version: %d on %s"
" at offset %"PRIu64, mdah->version,
dev_name(dev_area->dev), dev_area->start);
goto bad;
}
if (mdah->start != dev_area->start) {
log_error("Incorrect start sector in metadata area header: %"
PRIu64" on %s at offset %"PRIu64, mdah->start,
dev_name(dev_area->dev), dev_area->start);
goto bad;
}
return mdah;
bad:
dm_pool_free(fmt->cmd->mem, mdah);
return NULL;
}
static int _raw_write_mda_header(const struct format_type *fmt,
struct device *dev,
uint64_t start_byte, struct mda_header *mdah)
{
strncpy((char *)mdah->magic, FMTT_MAGIC, sizeof(mdah->magic));
mdah->version = FMTT_VERSION;
mdah->start = start_byte;
_xlate_mdah(mdah);
mdah->checksum_xl = xlate32(calc_crc(INITIAL_CRC, (uint8_t *)mdah->magic,
MDA_HEADER_SIZE -
sizeof(mdah->checksum_xl)));
if (!dev_write(dev, start_byte, MDA_HEADER_SIZE, mdah))
return_0;
return 1;
}
static struct raw_locn *_find_vg_rlocn(struct device_area *dev_area,
struct mda_header *mdah,
const char *vgname,
int *precommitted)
{
size_t len;
char vgnamebuf[NAME_LEN + 2] __attribute__((aligned(8)));
struct raw_locn *rlocn, *rlocn_precommitted;
struct lvmcache_info *info;
rlocn = mdah->raw_locns; /* Slot 0 */
rlocn_precommitted = rlocn + 1; /* Slot 1 */
/* Should we use precommitted metadata? */
if (*precommitted && rlocn_precommitted->size &&
(rlocn_precommitted->offset != rlocn->offset)) {
rlocn = rlocn_precommitted;
} else
*precommitted = 0;
/* Do not check non-existent metadata. */
if (!rlocn->offset && !rlocn->size)
return NULL;
/*
* Don't try to check existing metadata
* if given vgname is an empty string.
*/
if (!*vgname)
return rlocn;
/* FIXME Loop through rlocns two-at-a-time. List null-terminated. */
/* FIXME Ignore if checksum incorrect!!! */
if (!dev_read(dev_area->dev, dev_area->start + rlocn->offset,
sizeof(vgnamebuf), vgnamebuf))
goto_bad;
if (!strncmp(vgnamebuf, vgname, len = strlen(vgname)) &&
(isspace(vgnamebuf[len]) || vgnamebuf[len] == '{'))
return rlocn;
else
log_debug("Volume group name found in metadata does "
"not match expected name %s.", vgname);
bad:
if ((info = info_from_pvid(dev_area->dev->pvid, 0)))
lvmcache_update_vgname_and_id(info, FMT_TEXT_ORPHAN_VG_NAME,
FMT_TEXT_ORPHAN_VG_NAME, 0, NULL);
return NULL;
}
/*
* Determine offset for uncommitted metadata
*/
static uint64_t _next_rlocn_offset(struct raw_locn *rlocn,
struct mda_header *mdah)
{
if (!rlocn)
/* Find an empty slot */
/* FIXME Assume only one VG per mdah for now */
return MDA_HEADER_SIZE;
/* Start of free space - round up to next sector; circular */
return ((rlocn->offset + rlocn->size +
(SECTOR_SIZE - rlocn->size % SECTOR_SIZE) -
MDA_HEADER_SIZE) % (mdah->size - MDA_HEADER_SIZE))
+ MDA_HEADER_SIZE;
}
static int _raw_holds_vgname(struct format_instance *fid,
struct device_area *dev_area, const char *vgname)
{
int r = 0;
int noprecommit = 0;
struct mda_header *mdah;
if (!dev_open(dev_area->dev))
return_0;
if (!(mdah = raw_read_mda_header(fid->fmt, dev_area)))
return_0;
if (_find_vg_rlocn(dev_area, mdah, vgname, &noprecommit))
r = 1;
if (!dev_close(dev_area->dev))
stack;
return r;
}
static struct volume_group *_vg_read_raw_area(struct format_instance *fid,
const char *vgname,
struct device_area *area,
int precommitted)
{
struct volume_group *vg = NULL;
struct raw_locn *rlocn;
struct mda_header *mdah;
time_t when;
char *desc;
uint32_t wrap = 0;
if (!(mdah = raw_read_mda_header(fid->fmt, area)))
goto_out;
if (!(rlocn = _find_vg_rlocn(area, mdah, vgname, &precommitted))) {
log_debug("VG %s not found on %s", vgname, dev_name(area->dev));
goto out;
}
if (rlocn->offset + rlocn->size > mdah->size)
wrap = (uint32_t) ((rlocn->offset + rlocn->size) - mdah->size);
if (wrap > rlocn->offset) {
log_error("VG %s metadata too large for circular buffer",
vgname);
goto out;
}
/* FIXME 64-bit */
if (!(vg = text_vg_import_fd(fid, NULL, area->dev,
(off_t) (area->start + rlocn->offset),
(uint32_t) (rlocn->size - wrap),
(off_t) (area->start + MDA_HEADER_SIZE),
wrap, calc_crc, rlocn->checksum, &when,
&desc)))
goto_out;
log_debug("Read %s %smetadata (%u) from %s at %" PRIu64 " size %"
PRIu64, vg->name, precommitted ? "pre-commit " : "",
vg->seqno, dev_name(area->dev),
area->start + rlocn->offset, rlocn->size);
if (precommitted)
vg->status |= PRECOMMITTED;
out:
return vg;
}
static struct volume_group *_vg_read_raw(struct format_instance *fid,
const char *vgname,
struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct volume_group *vg;
if (!dev_open(mdac->area.dev))
return_NULL;
vg = _vg_read_raw_area(fid, vgname, &mdac->area, 0);
if (!dev_close(mdac->area.dev))
stack;
return vg;
}
static struct volume_group *_vg_read_precommit_raw(struct format_instance *fid,
const char *vgname,
struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct volume_group *vg;
if (!dev_open(mdac->area.dev))
return_NULL;
vg = _vg_read_raw_area(fid, vgname, &mdac->area, 1);
if (!dev_close(mdac->area.dev))
stack;
return vg;
}
static int _vg_write_raw(struct format_instance *fid, struct volume_group *vg,
struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct text_fid_context *fidtc = (struct text_fid_context *) fid->private;
struct raw_locn *rlocn;
struct mda_header *mdah;
struct pv_list *pvl;
int r = 0;
uint64_t new_wrap = 0, old_wrap = 0, new_end;
int found = 0;
int noprecommit = 0;
/* Ignore any mda on a PV outside the VG. vgsplit relies on this */
dm_list_iterate_items(pvl, &vg->pvs) {
if (pvl->pv->dev == mdac->area.dev) {
found = 1;
break;
}
}
if (!found)
return 1;
if (!dev_open(mdac->area.dev))
return_0;
if (!(mdah = raw_read_mda_header(fid->fmt, &mdac->area)))
goto_out;
rlocn = _find_vg_rlocn(&mdac->area, mdah,
vg->old_name ? vg->old_name : vg->name, &noprecommit);
mdac->rlocn.offset = _next_rlocn_offset(rlocn, mdah);
if (!fidtc->raw_metadata_buf &&
!(fidtc->raw_metadata_buf_size =
text_vg_export_raw(vg, "", &fidtc->raw_metadata_buf))) {
log_error("VG %s metadata writing failed", vg->name);
goto out;
}
mdac->rlocn.size = fidtc->raw_metadata_buf_size;
if (mdac->rlocn.offset + mdac->rlocn.size > mdah->size)
new_wrap = (mdac->rlocn.offset + mdac->rlocn.size) - mdah->size;
if (rlocn && (rlocn->offset + rlocn->size > mdah->size))
old_wrap = (rlocn->offset + rlocn->size) - mdah->size;
new_end = new_wrap ? new_wrap + MDA_HEADER_SIZE :
mdac->rlocn.offset + mdac->rlocn.size;
if ((new_wrap && old_wrap) ||
(rlocn && (new_wrap || old_wrap) && (new_end > rlocn->offset)) ||
(mdac->rlocn.size >= mdah->size)) {
log_error("VG %s metadata too large for circular buffer",
vg->name);
goto out;
}
log_debug("Writing %s metadata to %s at %" PRIu64 " len %" PRIu64,
vg->name, dev_name(mdac->area.dev), mdac->area.start +
mdac->rlocn.offset, mdac->rlocn.size - new_wrap);
/* Write text out, circularly */
if (!dev_write(mdac->area.dev, mdac->area.start + mdac->rlocn.offset,
(size_t) (mdac->rlocn.size - new_wrap),
fidtc->raw_metadata_buf))
goto_out;
if (new_wrap) {
log_debug("Writing metadata to %s at %" PRIu64 " len %" PRIu64,
dev_name(mdac->area.dev), mdac->area.start +
MDA_HEADER_SIZE, new_wrap);
if (!dev_write(mdac->area.dev,
mdac->area.start + MDA_HEADER_SIZE,
(size_t) new_wrap,
fidtc->raw_metadata_buf +
mdac->rlocn.size - new_wrap))
goto_out;
}
mdac->rlocn.checksum = calc_crc(INITIAL_CRC, (uint8_t *)fidtc->raw_metadata_buf,
(uint32_t) (mdac->rlocn.size -
new_wrap));
if (new_wrap)
mdac->rlocn.checksum = calc_crc(mdac->rlocn.checksum,
(uint8_t *)fidtc->raw_metadata_buf +
mdac->rlocn.size -
new_wrap, (uint32_t) new_wrap);
r = 1;
out:
if (!r) {
if (!dev_close(mdac->area.dev))
stack;
if (fidtc->raw_metadata_buf) {
dm_free(fidtc->raw_metadata_buf);
fidtc->raw_metadata_buf = NULL;
}
}
return r;
}
static int _vg_commit_raw_rlocn(struct format_instance *fid,
struct volume_group *vg,
struct metadata_area *mda,
int precommit)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct text_fid_context *fidtc = (struct text_fid_context *) fid->private;
struct mda_header *mdah;
struct raw_locn *rlocn;
struct pv_list *pvl;
int r = 0;
int found = 0;
int noprecommit = 0;
/* Ignore any mda on a PV outside the VG. vgsplit relies on this */
dm_list_iterate_items(pvl, &vg->pvs) {
if (pvl->pv->dev == mdac->area.dev) {
found = 1;
break;
}
}
if (!found)
return 1;
if (!(mdah = raw_read_mda_header(fid->fmt, &mdac->area)))
goto_out;
if (!(rlocn = _find_vg_rlocn(&mdac->area, mdah,
vg->old_name ? vg->old_name : vg->name,
&noprecommit))) {
mdah->raw_locns[0].offset = 0;
mdah->raw_locns[0].size = 0;
mdah->raw_locns[0].checksum = 0;
mdah->raw_locns[1].offset = 0;
mdah->raw_locns[1].size = 0;
mdah->raw_locns[1].checksum = 0;
mdah->raw_locns[2].offset = 0;
mdah->raw_locns[2].size = 0;
mdah->raw_locns[2].checksum = 0;
rlocn = &mdah->raw_locns[0];
}
if (precommit)
rlocn++;
else {
/* If not precommitting, wipe the precommitted rlocn */
mdah->raw_locns[1].offset = 0;
mdah->raw_locns[1].size = 0;
mdah->raw_locns[1].checksum = 0;
}
/* Is there new metadata to commit? */
if (mdac->rlocn.size) {
rlocn->offset = mdac->rlocn.offset;
rlocn->size = mdac->rlocn.size;
rlocn->checksum = mdac->rlocn.checksum;
log_debug("%sCommitting %s metadata (%u) to %s header at %"
PRIu64, precommit ? "Pre-" : "", vg->name, vg->seqno,
dev_name(mdac->area.dev), mdac->area.start);
} else
log_debug("Wiping pre-committed %s metadata from %s "
"header at %" PRIu64, vg->name,
dev_name(mdac->area.dev), mdac->area.start);
rlocn_set_ignored(mdah->raw_locns, mda_is_ignored(mda));
if (!_raw_write_mda_header(fid->fmt, mdac->area.dev, mdac->area.start,
mdah)) {
dm_pool_free(fid->fmt->cmd->mem, mdah);
log_error("Failed to write metadata area header");
goto out;
}
r = 1;
out:
if (!precommit) {
if (!dev_close(mdac->area.dev))
stack;
if (fidtc->raw_metadata_buf) {
dm_free(fidtc->raw_metadata_buf);
fidtc->raw_metadata_buf = NULL;
}
}
return r;
}
static int _vg_commit_raw(struct format_instance *fid, struct volume_group *vg,
struct metadata_area *mda)
{
return _vg_commit_raw_rlocn(fid, vg, mda, 0);
}
static int _vg_precommit_raw(struct format_instance *fid,
struct volume_group *vg,
struct metadata_area *mda)
{
return _vg_commit_raw_rlocn(fid, vg, mda, 1);
}
/* Close metadata area devices */
static int _vg_revert_raw(struct format_instance *fid, struct volume_group *vg,
struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct pv_list *pvl;
int found = 0;
/* Ignore any mda on a PV outside the VG. vgsplit relies on this */
dm_list_iterate_items(pvl, &vg->pvs) {
if (pvl->pv->dev == mdac->area.dev) {
found = 1;
break;
}
}
if (!found)
return 1;
/* Wipe pre-committed metadata */
mdac->rlocn.size = 0;
return _vg_commit_raw_rlocn(fid, vg, mda, 0);
}
static int _vg_remove_raw(struct format_instance *fid, struct volume_group *vg,
struct metadata_area *mda)
{
struct mda_context *mdac = (struct mda_context *) mda->metadata_locn;
struct mda_header *mdah;
struct raw_locn *rlocn;
int r = 0;
int noprecommit = 0;
if (!dev_open(mdac->area.dev))
return_0;
if (!(mdah = raw_read_mda_header(fid->fmt, &mdac->area)))
goto_out;
if (!(rlocn = _find_vg_rlocn(&mdac->area, mdah, vg->name, &noprecommit))) {
rlocn = &mdah->raw_locns[0];
mdah->raw_locns[1].offset = 0;
}
rlocn->offset = 0;
rlocn->size = 0;
rlocn->checksum = 0;
rlocn_set_ignored(mdah->raw_locns, mda_is_ignored(mda));
if (!_raw_write_mda_header(fid->fmt, mdac->area.dev, mdac->area.start,
mdah)) {
dm_pool_free(fid->fmt->cmd->mem, mdah);
log_error("Failed to write metadata area header");
goto out;
}
r = 1;
out:
if (!dev_close(mdac->area.dev))
stack;
return r;
}
static struct volume_group *_vg_read_file_name(struct format_instance *fid,
const char *vgname,
const char *read_path)
{
struct volume_group *vg;
time_t when;
char *desc;
if (!(vg = text_vg_import_file(fid, read_path, &when, &desc)))
return_NULL;
/*
* Currently you can only have a single volume group per
* text file (this restriction may remain). We need to
* check that it contains the correct volume group.
*/
if (vgname && strcmp(vgname, vg->name)) {
free_vg(vg);
log_error("'%s' does not contain volume group '%s'.",
read_path, vgname);
return NULL;
} else
log_debug("Read volume group %s from %s", vg->name, read_path);
return vg;
}
static struct volume_group *_vg_read_file(struct format_instance *fid,
const char *vgname,
struct metadata_area *mda)
{
struct text_context *tc = (struct text_context *) mda->metadata_locn;
return _vg_read_file_name(fid, vgname, tc->path_live);
}
static struct volume_group *_vg_read_precommit_file(struct format_instance *fid,
const char *vgname,
struct metadata_area *mda)
{
struct text_context *tc = (struct text_context *) mda->metadata_locn;
struct volume_group *vg;
if ((vg = _vg_read_file_name(fid, vgname, tc->path_edit)))
vg->status |= PRECOMMITTED;
else
vg = _vg_read_file_name(fid, vgname, tc->path_live);
return vg;
}
static int _vg_write_file(struct format_instance *fid __attribute__((unused)),
struct volume_group *vg, struct metadata_area *mda)
{
struct text_context *tc = (struct text_context *) mda->metadata_locn;
FILE *fp;
int fd;
char *slash;
char temp_file[PATH_MAX], temp_dir[PATH_MAX];
slash = strrchr(tc->path_edit, '/');
if (slash == 0)
strcpy(temp_dir, ".");
else if (slash - tc->path_edit < PATH_MAX) {
strncpy(temp_dir, tc->path_edit,
(size_t) (slash - tc->path_edit));
temp_dir[slash - tc->path_edit] = '\0';
} else {
log_error("Text format failed to determine directory.");
return 0;
}
if (!create_temp_name(temp_dir, temp_file, sizeof(temp_file), &fd,
&vg->cmd->rand_seed)) {
log_error("Couldn't create temporary text file name.");
return 0;
}
if (!(fp = fdopen(fd, "w"))) {
log_sys_error("fdopen", temp_file);
if (close(fd))
log_sys_error("fclose", temp_file);
return 0;
}
log_debug("Writing %s metadata to %s", vg->name, temp_file);
if (!text_vg_export_file(vg, tc->desc, fp)) {
log_error("Failed to write metadata to %s.", temp_file);
if (fclose(fp))
log_sys_error("fclose", temp_file);
return 0;
}
if (fsync(fd) && (errno != EROFS) && (errno != EINVAL)) {
log_sys_error("fsync", tc->path_edit);
if (fclose(fp))
log_sys_error("fclose", tc->path_edit);
return 0;
}
if (lvm_fclose(fp, tc->path_edit))
return_0;
if (rename(temp_file, tc->path_edit)) {
log_debug("Renaming %s to %s", temp_file, tc->path_edit);
log_error("%s: rename to %s failed: %s", temp_file,
tc->path_edit, strerror(errno));
return 0;
}
return 1;
}
static int _vg_commit_file_backup(struct format_instance *fid __attribute__((unused)),
struct volume_group *vg,
struct metadata_area *mda)
{
struct text_context *tc = (struct text_context *) mda->metadata_locn;
if (test_mode()) {
log_verbose("Test mode: Skipping committing %s metadata (%u)",
vg->name, vg->seqno);
if (unlink(tc->path_edit)) {
log_debug("Unlinking %s", tc->path_edit);
log_sys_error("unlink", tc->path_edit);
return 0;
}
} else {
log_debug("Committing %s metadata (%u)", vg->name, vg->seqno);
log_debug("Renaming %s to %s", tc->path_edit, tc->path_live);
if (rename(tc->path_edit, tc->path_live)) {
log_error("%s: rename to %s failed: %s", tc->path_edit,
tc->path_live, strerror(errno));
return 0;
}
}
sync_dir(tc->path_edit);
return 1;
}
static int _vg_commit_file(struct format_instance *fid, struct volume_group *vg,
struct metadata_area *mda)
{
struct text_context *tc = (struct text_context *) mda->metadata_locn;
char *slash;
char new_name[PATH_MAX];
size_t len;
if (!_vg_commit_file_backup(fid, vg, mda))
return 0;
/* vgrename? */
if ((slash = strrchr(tc->path_live, '/')))
slash = slash + 1;
else
slash = tc->path_live;
if (strcmp(slash, vg->name)) {
len = slash - tc->path_live;
strncpy(new_name, tc->path_live, len);
strcpy(new_name + len, vg->name);
log_debug("Renaming %s to %s", tc->path_live, new_name);
if (test_mode())
log_verbose("Test mode: Skipping rename");
else {
if (rename(tc->path_live, new_name)) {
log_error("%s: rename to %s failed: %s",
tc->path_live, new_name,
strerror(errno));
sync_dir(new_name);
return 0;
}
}
}
return 1;
}
static int _vg_remove_file(struct format_instance *fid __attribute__((unused)),
struct volume_group *vg __attribute__((unused)),
struct metadata_area *mda)
{
struct text_context *tc = (struct text_context *) mda->metadata_locn;
if (path_exists(tc->path_edit) && unlink(tc->path_edit)) {
log_sys_error("unlink", tc->path_edit);
return 0;
}
if (path_exists(tc->path_live) && unlink(tc->path_live)) {
log_sys_error("unlink", tc->path_live);
return 0;
}
sync_dir(tc->path_live);
return 1;
}
static int _scan_file(const struct format_type *fmt, const char *vgname)
{
struct dirent *dirent;
struct dir_list *dl;
struct dm_list *dir_list;
char *tmp;
DIR *d;
struct volume_group *vg;
struct format_instance *fid;
char path[PATH_MAX];
char *scanned_vgname;
dir_list = &((struct mda_lists *) fmt->private)->dirs;
dm_list_iterate_items(dl, dir_list) {
if (!(d = opendir(dl->dir))) {
log_sys_error("opendir", dl->dir);
continue;
}
while ((dirent = readdir(d)))
if (strcmp(dirent->d_name, ".") &&
strcmp(dirent->d_name, "..") &&
(!(tmp = strstr(dirent->d_name, ".tmp")) ||
tmp != dirent->d_name + strlen(dirent->d_name)
- 4)) {
scanned_vgname = dirent->d_name;
/* If vgname supplied, only scan that one VG */
if (vgname && strcmp(vgname, scanned_vgname))
continue;
if (dm_snprintf(path, PATH_MAX, "%s/%s",
dl->dir, scanned_vgname) < 0) {
log_error("Name too long %s/%s",
dl->dir, scanned_vgname);
break;
}
/* FIXME stat file to see if it's changed */
fid = _text_create_text_instance(fmt, NULL, NULL,
NULL);
if ((vg = _vg_read_file_name(fid, scanned_vgname,
path))) {
/* FIXME Store creation host in vg */
lvmcache_update_vg(vg, 0);
free_vg(vg);
}
}
if (closedir(d))
log_sys_error("closedir", dl->dir);
}
return 1;
}
const char *vgname_from_mda(const struct format_type *fmt,
struct mda_header *mdah,
struct device_area *dev_area, struct id *vgid,
uint64_t *vgstatus, char **creation_host,
uint64_t *mda_free_sectors)
{
struct raw_locn *rlocn;
uint32_t wrap = 0;
const char *vgname = NULL;
unsigned int len = 0;
char buf[NAME_LEN + 1] __attribute__((aligned(8)));
char uuid[64] __attribute__((aligned(8)));
uint64_t buffer_size, current_usage;
if (mda_free_sectors)
*mda_free_sectors = ((dev_area->size - MDA_HEADER_SIZE) / 2) >> SECTOR_SHIFT;
if (!mdah) {
log_error(INTERNAL_ERROR "vgname_from_mda called with NULL pointer for mda_header");
goto_out;
}
/* FIXME Cope with returning a list */
rlocn = mdah->raw_locns;
/*
* If no valid offset, do not try to search for vgname
*/
if (!rlocn->offset)
goto out;
/* Do quick check for a vgname */
if (!dev_read(dev_area->dev, dev_area->start + rlocn->offset,
NAME_LEN, buf))
goto_out;
while (buf[len] && !isspace(buf[len]) && buf[len] != '{' &&
len < (NAME_LEN - 1))
len++;
buf[len] = '\0';
/* Ignore this entry if the characters aren't permissible */
if (!validate_name(buf))
goto_out;
/* We found a VG - now check the metadata */
if (rlocn->offset + rlocn->size > mdah->size)
wrap = (uint32_t) ((rlocn->offset + rlocn->size) - mdah->size);
if (wrap > rlocn->offset) {
log_error("%s: metadata too large for circular buffer",
dev_name(dev_area->dev));
goto out;
}
/* FIXME 64-bit */
if (!(vgname = text_vgname_import(fmt, dev_area->dev,
(off_t) (dev_area->start +
rlocn->offset),
(uint32_t) (rlocn->size - wrap),
(off_t) (dev_area->start +
MDA_HEADER_SIZE),
wrap, calc_crc, rlocn->checksum,
vgid, vgstatus, creation_host)))
goto_out;
/* Ignore this entry if the characters aren't permissible */
if (!validate_name(vgname)) {
vgname = NULL;
goto_out;
}
if (!id_write_format(vgid, uuid, sizeof(uuid))) {
vgname = NULL;
goto_out;
}
log_debug("%s: Found metadata at %" PRIu64 " size %" PRIu64
" (in area at %" PRIu64 " size %" PRIu64
") for %s (%s)",
dev_name(dev_area->dev), dev_area->start + rlocn->offset,
rlocn->size, dev_area->start, dev_area->size, vgname, uuid);
if (mda_free_sectors) {
current_usage = (rlocn->size + SECTOR_SIZE - UINT64_C(1)) -
(rlocn->size + SECTOR_SIZE - UINT64_C(1)) % SECTOR_SIZE;
buffer_size = mdah->size - MDA_HEADER_SIZE;
if (current_usage * 2 >= buffer_size)
*mda_free_sectors = UINT64_C(0);
else
*mda_free_sectors = ((buffer_size - 2 * current_usage) / 2) >> SECTOR_SHIFT;
}
out:
return vgname;
}
static int _scan_raw(const struct format_type *fmt, const char *vgname __attribute__((unused)))
{
struct raw_list *rl;
struct dm_list *raw_list;
const char *scanned_vgname;
struct volume_group *vg;
struct format_instance fid;
struct id vgid;
uint64_t vgstatus;
struct mda_header *mdah;
raw_list = &((struct mda_lists *) fmt->private)->raws;
fid.fmt = fmt;
dm_list_init(&fid.metadata_areas_in_use);
dm_list_init(&fid.metadata_areas_ignored);
dm_list_iterate_items(rl, raw_list) {
/* FIXME We're reading mdah twice here... */
if (!dev_open(rl->dev_area.dev)) {
stack;
continue;
}
if (!(mdah = raw_read_mda_header(fmt, &rl->dev_area))) {
stack;
goto close_dev;
}
if ((scanned_vgname = vgname_from_mda(fmt, mdah,
&rl->dev_area, &vgid, &vgstatus,
NULL, NULL))) {
vg = _vg_read_raw_area(&fid, scanned_vgname, &rl->dev_area, 0);
if (vg)
lvmcache_update_vg(vg, 0);
}
close_dev:
if (!dev_close(rl->dev_area.dev))
stack;
}
return 1;
}
static int _text_scan(const struct format_type *fmt, const char *vgname)
{
return (_scan_file(fmt, vgname) & _scan_raw(fmt, vgname));
}
/* For orphan, creates new mdas according to policy.
Always have an mda between end-of-label and pe_align() boundary */
static int _mda_setup(const struct format_type *fmt,
uint64_t pe_start, uint64_t pe_end,
int pvmetadatacopies, uint64_t pvmetadatasize,
unsigned metadataignore, struct dm_list *mdas,
struct physical_volume *pv,
struct volume_group *vg __attribute__((unused)))
{
uint64_t mda_adjustment, disk_size, alignment, alignment_offset;
uint64_t start1, mda_size1; /* First area - start of disk */
uint64_t start2, mda_size2; /* Second area - end of disk */
uint64_t wipe_size = 8 << SECTOR_SHIFT;
size_t pagesize = lvm_getpagesize();
if (!pvmetadatacopies)
return 1;
alignment = pv->pe_align << SECTOR_SHIFT;
alignment_offset = pv->pe_align_offset << SECTOR_SHIFT;
disk_size = pv->size << SECTOR_SHIFT;
pe_start <<= SECTOR_SHIFT;
pe_end <<= SECTOR_SHIFT;
if (pe_end > disk_size) {
log_error("Physical extents end beyond end of device %s!",
pv_dev_name(pv));
return 0;
}
/* Requested metadatasize */
mda_size1 = pvmetadatasize << SECTOR_SHIFT;
/* Place mda straight after label area at start of disk */
start1 = LABEL_SCAN_SIZE;
/* Unless the space available is tiny, round to PAGE_SIZE boundary */
if ((!pe_start && !pe_end) ||
((pe_start > start1) && (pe_start - start1 >= MDA_SIZE_MIN))) {
mda_adjustment = start1 % pagesize;
if (mda_adjustment)
start1 += (pagesize - mda_adjustment);
}
/* Round up to pe_align boundary */
mda_adjustment = (mda_size1 + start1) % alignment;
if (mda_adjustment) {
mda_size1 += (alignment - mda_adjustment);
/* Revert if it's now too large */
if (start1 + mda_size1 > disk_size)
mda_size1 -= (alignment - mda_adjustment);
}
/* Add pe_align_offset if on pe_align boundary */
if (alignment_offset &&
(((start1 + mda_size1) % alignment) == 0)) {
mda_size1 += alignment_offset;
/* Revert if it's now too large */
if (start1 + mda_size1 > disk_size)
mda_size1 -= alignment_offset;
}
/* Ensure it's not going to be bigger than the disk! */
if (start1 + mda_size1 > disk_size) {
log_warn("WARNING: metadata area fills disk leaving no "
"space for data on %s.", pv_dev_name(pv));
/* Leave some free space for rounding */
/* Avoid empty data area as could cause tools problems */
mda_size1 = disk_size - start1 - alignment * 2;
if (start1 + mda_size1 > disk_size) {
log_error("Insufficient space for first mda on %s",
pv_dev_name(pv));
return 0;
}
/* Round up to pe_align boundary */
mda_adjustment = (mda_size1 + start1) % alignment;
if (mda_adjustment)
mda_size1 += (alignment - mda_adjustment);
/* Only have 1 mda in this case */
pvmetadatacopies = 1;
}
/* If we already have PEs, avoid overlap */
if (pe_start || pe_end) {
if (pe_start <= start1)
mda_size1 = 0;
else if (start1 + mda_size1 > pe_start)
mda_size1 = pe_start - start1;
}
/* FIXME If creating new mdas, wipe them! */
if (mda_size1) {
if (!add_mda(fmt, fmt->cmd->mem, mdas, pv->dev, start1,
mda_size1, metadataignore))
return 0;
if (!dev_set((struct device *) pv->dev, start1,
(size_t) (mda_size1 >
wipe_size ? : mda_size1), 0)) {
log_error("Failed to wipe new metadata area");
return 0;
}
if (pvmetadatacopies == 1)
return 1;
} else
start1 = 0;
/* A second copy at end of disk */
mda_size2 = pvmetadatasize << SECTOR_SHIFT;
/* Ensure it's not going to be bigger than the disk! */
if (mda_size2 > disk_size)
mda_size2 = disk_size - start1 - mda_size1;
mda_adjustment = (disk_size - mda_size2) % alignment;
if (mda_adjustment)
mda_size2 += mda_adjustment;
start2 = disk_size - mda_size2;
/* If we already have PEs, avoid overlap */
if (pe_start || pe_end) {
if (start2 < pe_end) {
mda_size2 -= (pe_end - start2);
start2 = pe_end;
}
}
/* If we already have a first mda, avoid overlap */
if (mda_size1) {
if (start2 < start1 + mda_size1) {
mda_size2 -= (start1 + mda_size1 - start2);
start2 = start1 + mda_size1;
}
/* No room for any PEs here now! */
}
if (mda_size2) {
if (!add_mda(fmt, fmt->cmd->mem, mdas, pv->dev, start2,
mda_size2, metadataignore)) return 0;
if (!dev_set(pv->dev, start2,
(size_t) (mda_size1 >
wipe_size ? : mda_size1), 0)) {
log_error("Failed to wipe new metadata area");
return 0;
}
} else
return 0;
return 1;
}
/* Only for orphans */
/* Set label_sector to -1 if rewriting existing label into same sector */
/* If mdas is supplied it overwrites existing mdas e.g. used with pvcreate */
static int _text_pv_write(const struct format_type *fmt, struct physical_volume *pv,
struct dm_list *mdas, int64_t label_sector)
{
struct label *label;
struct lvmcache_info *info;
struct mda_context *mdac;
struct metadata_area *mda;
char buf[MDA_HEADER_SIZE] __attribute__((aligned(8)));
struct mda_header *mdah = (struct mda_header *) buf;
uint64_t adjustment;
struct data_area_list *da;
/* FIXME Test mode don't update cache? */
if (!(info = lvmcache_add(fmt->labeller, (char *) &pv->id, pv->dev,
FMT_TEXT_ORPHAN_VG_NAME, NULL, 0)))
return_0;
label = info->label;
if (label_sector != -1)
label->sector = label_sector;
info->device_size = pv->size << SECTOR_SHIFT;
info->fmt = fmt;
/* If mdas supplied, use them regardless of existing ones, */
/* otherwise retain existing ones */
if (mdas) {
if (info->mdas.n)
del_mdas(&info->mdas);
else
dm_list_init(&info->mdas);
dm_list_iterate_items(mda, mdas) {
mdac = mda->metadata_locn;
log_debug("Creating metadata area on %s at sector %"
PRIu64 " size %" PRIu64 " sectors",
dev_name(mdac->area.dev),
mdac->area.start >> SECTOR_SHIFT,
mdac->area.size >> SECTOR_SHIFT);
add_mda(fmt, NULL, &info->mdas, mdac->area.dev,
mdac->area.start, mdac->area.size, mda_is_ignored(mda));
}
/* FIXME Temporary until mda creation supported by tools */
} else if (!info->mdas.n) {
dm_list_init(&info->mdas);
}
/*
* If no pe_start supplied but PV already exists,
* get existing value; use-cases include:
* - pvcreate on PV without prior pvremove
* - vgremove on VG with PV(s) that have pe_start=0 (hacked cfg)
*/
if (info->das.n) {
if (!pv->pe_start)
dm_list_iterate_items(da, &info->das)
pv->pe_start = da->disk_locn.offset >> SECTOR_SHIFT;
del_das(&info->das);
} else
dm_list_init(&info->das);
#if 0
/*
* FIXME: ideally a pre-existing pe_start seen in .pv_write
* would always be preserved BUT 'pvcreate on PV without prior pvremove'
* could easily cause the pe_start to overlap with the first mda!
*/
if (pv->pe_start) {
log_very_verbose("%s: preserving pe_start=%lu",
pv_dev_name(pv), pv->pe_start);
goto preserve_pe_start;
}
#endif
/*
* If pe_start is still unset, set it to first aligned
* sector after any metadata areas that begin before pe_start.
*/
if (!pv->pe_start) {
pv->pe_start = pv->pe_align;
if (pv->pe_align_offset)
pv->pe_start += pv->pe_align_offset;
}
dm_list_iterate_items(mda, &info->mdas) {
mdac = (struct mda_context *) mda->metadata_locn;
if (pv->dev == mdac->area.dev &&
((mdac->area.start <= (pv->pe_start << SECTOR_SHIFT)) ||
(mdac->area.start <= lvm_getpagesize() &&
pv->pe_start < (lvm_getpagesize() >> SECTOR_SHIFT))) &&
(mdac->area.start + mdac->area.size >
(pv->pe_start << SECTOR_SHIFT))) {
pv->pe_start = (mdac->area.start + mdac->area.size)
>> SECTOR_SHIFT;
/* Adjust pe_start to: (N * pe_align) + pe_align_offset */
if (pv->pe_align) {
adjustment =
(pv->pe_start - pv->pe_align_offset) % pv->pe_align;
if (adjustment)
pv->pe_start += (pv->pe_align - adjustment);
log_very_verbose("%s: setting pe_start=%" PRIu64
" (orig_pe_start=%" PRIu64 ", "
"pe_align=%lu, pe_align_offset=%lu, "
"adjustment=%" PRIu64 ")",
pv_dev_name(pv), pv->pe_start,
(adjustment ?
pv->pe_start - (pv->pe_align - adjustment) :
pv->pe_start),
pv->pe_align, pv->pe_align_offset, adjustment);
}
}
}
if (pv->pe_start >= pv->size) {
log_error("Data area is beyond end of device %s!",
pv_dev_name(pv));
return 0;
}
/* FIXME: preserve_pe_start: */
if (!add_da
(NULL, &info->das, pv->pe_start << SECTOR_SHIFT, UINT64_C(0)))
return_0;
if (!dev_open(pv->dev))
return_0;
dm_list_iterate_items(mda, &info->mdas) {
mdac = mda->metadata_locn;
memset(&buf, 0, sizeof(buf));
mdah->size = mdac->area.size;
rlocn_set_ignored(mdah->raw_locns, mda_is_ignored(mda));
if (!_raw_write_mda_header(fmt, mdac->area.dev,
mdac->area.start, mdah)) {
if (!dev_close(pv->dev))
stack;
return_0;
}
}
if (!label_write(pv->dev, label)) {
dev_close(pv->dev);
return_0;
}
if (!dev_close(pv->dev))
return_0;
return 1;
}
static int _add_raw(struct dm_list *raw_list, struct device_area *dev_area)
{
struct raw_list *rl;
/* Already present? */
dm_list_iterate_items(rl, raw_list) {
/* FIXME Check size/overlap consistency too */
if (rl->dev_area.dev == dev_area->dev &&
rl->dev_area.start == dev_area->start)
return 1;
}
if (!(rl = dm_malloc(sizeof(struct raw_list)))) {
log_error("_add_raw allocation failed");
return 0;
}
memcpy(&rl->dev_area, dev_area, sizeof(*dev_area));
dm_list_add(raw_list, &rl->list);
return 1;
}
static int _get_pv_if_in_vg(struct lvmcache_info *info,
struct physical_volume *pv)
{
if (info->vginfo && info->vginfo->vgname &&
!is_orphan_vg(info->vginfo->vgname) &&
get_pv_from_vg_by_id(info->fmt, info->vginfo->vgname,
info->vginfo->vgid, info->dev->pvid, pv))
return 1;
return 0;
}
static int _populate_pv_fields(struct lvmcache_info *info,
struct physical_volume *pv,
int scan_label_only)
{
struct data_area_list *da;
/* Have we already cached vgname? */
if (!scan_label_only && _get_pv_if_in_vg(info, pv))
return 1;
/* Perform full scan (just the first time) and try again */
if (!scan_label_only && !memlock() && !full_scan_done()) {
lvmcache_label_scan(info->fmt->cmd, 2);
if (_get_pv_if_in_vg(info, pv))
return 1;
}
/* Orphan */
pv->dev = info->dev;
pv->fmt = info->fmt;
pv->size = info->device_size >> SECTOR_SHIFT;
pv->vg_name = FMT_TEXT_ORPHAN_VG_NAME;
memcpy(&pv->id, &info->dev->pvid, sizeof(pv->id));
/* Currently only support exactly one data area */
if (dm_list_size(&info->das) != 1) {
log_error("Must be exactly one data area (found %d) on PV %s",
dm_list_size(&info->das), dev_name(info->dev));
return 0;
}
dm_list_iterate_items(da, &info->das)
pv->pe_start = da->disk_locn.offset >> SECTOR_SHIFT;
return 1;
}
/*
* Copy constructor for a metadata_locn.
*/
static void *_metadata_locn_copy_raw(struct dm_pool *mem, void *metadata_locn)
{
struct mda_context *mdac, *mdac_new;
mdac = (struct mda_context *) metadata_locn;
if (!(mdac_new = dm_pool_alloc(mem, sizeof(*mdac_new)))) {
log_error("mda_context allocation failed");
return NULL;
}
memcpy(mdac_new, mdac, sizeof(*mdac));
return mdac_new;
}
/*
* Return a string description of the metadata location.
*/
static const char *_metadata_locn_name_raw(void *metadata_locn)
{
struct mda_context *mdac = (struct mda_context *) metadata_locn;
return dev_name(mdac->area.dev);
}
static uint64_t _metadata_locn_offset_raw(void *metadata_locn)
{
struct mda_context *mdac = (struct mda_context *) metadata_locn;
return mdac->area.start;
}
static int _text_pv_read(const struct format_type *fmt, const char *pv_name,
struct physical_volume *pv, struct dm_list *mdas,
int scan_label_only)
{
struct metadata_area *mda, *mda_new;
struct label *label;
struct device *dev;
struct lvmcache_info *info;
if (!(dev = dev_cache_get(pv_name, fmt->cmd->filter)))
return_0;
if (!(label_read(dev, &label, UINT64_C(0))))
return_0;
info = (struct lvmcache_info *) label->info;
if (!_populate_pv_fields(info, pv, scan_label_only))
return 0;
if (!mdas)
return 1;
/* Add copy of mdas to supplied list */
dm_list_iterate_items(mda, &info->mdas) {
mda_new = mda_copy(fmt->cmd->mem, mda);
if (!mda_new)
return 0;
dm_list_add(mdas, &mda_new->list);
}
return 1;
}
static void _text_destroy_instance(struct format_instance *fid __attribute__((unused)))
{
}
static void _free_dirs(struct dm_list *dir_list)
{
struct dm_list *dl, *tmp;
dm_list_iterate_safe(dl, tmp, dir_list) {
dm_list_del(dl);
dm_free(dl);
}
}
static void _free_raws(struct dm_list *raw_list)
{
struct dm_list *rl, *tmp;
dm_list_iterate_safe(rl, tmp, raw_list) {
dm_list_del(rl);
dm_free(rl);
}
}
static void _text_destroy(const struct format_type *fmt)
{
if (fmt->private) {
_free_dirs(&((struct mda_lists *) fmt->private)->dirs);
_free_raws(&((struct mda_lists *) fmt->private)->raws);
dm_free(fmt->private);
}
dm_free((void *)fmt);
}
static struct metadata_area_ops _metadata_text_file_ops = {
.vg_read = _vg_read_file,
.vg_read_precommit = _vg_read_precommit_file,
.vg_write = _vg_write_file,
.vg_remove = _vg_remove_file,
.vg_commit = _vg_commit_file
};
static struct metadata_area_ops _metadata_text_file_backup_ops = {
.vg_read = _vg_read_file,
.vg_write = _vg_write_file,
.vg_remove = _vg_remove_file,
.vg_commit = _vg_commit_file_backup
};
static struct metadata_area_ops _metadata_text_raw_ops = {
.vg_read = _vg_read_raw,
.vg_read_precommit = _vg_read_precommit_raw,
.vg_write = _vg_write_raw,
.vg_remove = _vg_remove_raw,
.vg_precommit = _vg_precommit_raw,
.vg_commit = _vg_commit_raw,
.vg_revert = _vg_revert_raw,
.mda_metadata_locn_copy = _metadata_locn_copy_raw,
.mda_metadata_locn_name = _metadata_locn_name_raw,
.mda_metadata_locn_offset = _metadata_locn_offset_raw,
.mda_free_sectors = _mda_free_sectors_raw,
.mda_total_sectors = _mda_total_sectors_raw,
.mda_in_vg = _mda_in_vg_raw,
.pv_analyze_mda = _pv_analyze_mda_raw,
.mda_locns_match = _mda_locns_match_raw
};
/* pvmetadatasize in sectors */
/*
* pe_start goal: FIXME -- reality of .pv_write complexity undermines this goal
* - In cases where a pre-existing pe_start is provided (pvcreate --restorefile
* and vgconvert): pe_start must not be changed (so pv->pe_start = pe_start).
* - In cases where pe_start is 0: leave pv->pe_start as 0 and defer the
* setting of pv->pe_start to .pv_write
*/
static int _text_pv_setup(const struct format_type *fmt,
uint64_t pe_start, uint32_t extent_count,
uint32_t extent_size, unsigned long data_alignment,
unsigned long data_alignment_offset,
int pvmetadatacopies, uint64_t pvmetadatasize,
unsigned metadataignore, struct dm_list *mdas,
struct physical_volume *pv, struct volume_group *vg)
{
struct metadata_area *mda, *mda_new, *mda2;
struct mda_context *mdac, *mdac2;
struct dm_list *pvmdas;
struct lvmcache_info *info;
int found;
uint64_t pe_end = 0;
unsigned mda_count = 0;
uint64_t mda_size2 = 0;
uint64_t pe_count;
/* FIXME Cope with pvchange */
/* FIXME Merge code with _text_create_text_instance */
/* If new vg, add any further mdas on this PV to the fid's mda list */
if (vg) {
/* Iterate through all mdas on this PV */
if ((info = info_from_pvid(pv->dev->pvid, 0))) {
pvmdas = &info->mdas;
dm_list_iterate_items(mda, pvmdas) {
mda_count++;
mdac =
(struct mda_context *) mda->metadata_locn;
/* FIXME Check it isn't already in use */
/* Reduce usable device size */
if (mda_count > 1)
mda_size2 = mdac->area.size >> SECTOR_SHIFT;
/* Ensure it isn't already on list */
found = 0;
dm_list_iterate_items(mda2, mdas) {
if (mda2->ops !=
&_metadata_text_raw_ops) continue;
mdac2 =
(struct mda_context *)
mda2->metadata_locn;
if (!memcmp
(&mdac2->area, &mdac->area,
sizeof(mdac->area))) {
found = 1;
break;
}
}
if (found)
continue;
mda_new = mda_copy(fmt->cmd->mem, mda);
if (!mda_new)
return_0;
dm_list_add(mdas, &mda_new->list);
/* FIXME multiple dev_areas inside area */
}
}
/* FIXME Cope with genuine pe_count 0 */
/* If missing, estimate pv->size from file-based metadata */
if (!pv->size && pv->pe_count)
pv->size = pv->pe_count * (uint64_t) vg->extent_size +
pv->pe_start + mda_size2;
/* Recalculate number of extents that will fit */
if (!pv->pe_count) {
pe_count = (pv->size - pv->pe_start - mda_size2) /
vg->extent_size;
if (pe_count > UINT32_MAX) {
log_error("PV %s too large for extent size %s.",
pv_dev_name(pv),
display_size(vg->cmd, (uint64_t) vg->extent_size));
return 0;
}
pv->pe_count = (uint32_t) pe_count;
}
/* Unlike LVM1, we don't store this outside a VG */
/* FIXME Default from config file? vgextend cmdline flag? */
pv->status |= ALLOCATABLE_PV;
} else {
if (pe_start)
pv->pe_start = pe_start;
if (!data_alignment)
data_alignment = find_config_tree_int(pv->fmt->cmd,
"devices/data_alignment",
0) * 2;
if (set_pe_align(pv, data_alignment) != data_alignment &&
data_alignment) {
log_error("%s: invalid data alignment of "
"%lu sectors (requested %lu sectors)",
pv_dev_name(pv), pv->pe_align, data_alignment);
return 0;
}
if (set_pe_align_offset(pv, data_alignment_offset) != data_alignment_offset &&
data_alignment_offset) {
log_error("%s: invalid data alignment offset of "
"%lu sectors (requested %lu sectors)",
pv_dev_name(pv), pv->pe_align_offset, data_alignment_offset);
return 0;
}
if (pv->pe_align < pv->pe_align_offset) {
log_error("%s: pe_align (%lu sectors) must not be less "
"than pe_align_offset (%lu sectors)",
pv_dev_name(pv), pv->pe_align, pv->pe_align_offset);
return 0;
}
/*
* This initialization has a side-effect of allowing
* orphaned PVs to be created with the proper alignment.
* Setting pv->pe_start here circumvents .pv_write's
* "pvcreate on PV without prior pvremove" retreival of
* the PV's previous pe_start.
* - Without this you get actual != expected pe_start
* failures in the testsuite.
*/
if (!pe_start && pv->pe_start < pv->pe_align)
pv->pe_start = pv->pe_align;
if (extent_count)
pe_end = pe_start + extent_count * extent_size - 1;
if (!_mda_setup(fmt, pe_start, pe_end, pvmetadatacopies,
pvmetadatasize, metadataignore, mdas, pv, vg))
return_0;
}
return 1;
}
/* NULL vgname means use only the supplied context e.g. an archive file */
static struct format_instance *_text_create_text_instance(const struct format_type
*fmt, const char *vgname,
const char *vgid,
void *context)
{
struct format_instance *fid;
struct text_fid_context *fidtc;
struct metadata_area *mda;
struct mda_context *mdac;
struct dir_list *dl;
struct raw_list *rl;
struct dm_list *dir_list, *raw_list;
char path[PATH_MAX];
struct lvmcache_vginfo *vginfo;
struct lvmcache_info *info;
if (!(fid = dm_pool_alloc(fmt->cmd->mem, sizeof(*fid)))) {
log_error("Couldn't allocate format instance object.");
return NULL;
}
if (!(fidtc = (struct text_fid_context *)
dm_pool_zalloc(fmt->cmd->mem,sizeof(*fidtc)))) {
log_error("Couldn't allocate text_fid_context.");
return NULL;
}
fidtc->raw_metadata_buf = NULL;
fid->private = (void *) fidtc;
fid->fmt = fmt;
dm_list_init(&fid->metadata_areas_in_use);
dm_list_init(&fid->metadata_areas_ignored);
if (!vgname) {
if (!(mda = dm_pool_zalloc(fmt->cmd->mem, sizeof(*mda))))
return_NULL;
mda->ops = &_metadata_text_file_backup_ops;
mda->metadata_locn = context;
mda->status = 0;
fid_add_mda(fid, mda);
} else {
dir_list = &((struct mda_lists *) fmt->private)->dirs;
dm_list_iterate_items(dl, dir_list) {
if (dm_snprintf(path, PATH_MAX, "%s/%s",
dl->dir, vgname) < 0) {
log_error("Name too long %s/%s", dl->dir,
vgname);
return NULL;
}
context = create_text_context(fmt->cmd, path, NULL);
if (!(mda = dm_pool_zalloc(fmt->cmd->mem, sizeof(*mda))))
return_NULL;
mda->ops = &_metadata_text_file_ops;
mda->metadata_locn = context;
mda->status = 0;
fid_add_mda(fid, mda);
}
raw_list = &((struct mda_lists *) fmt->private)->raws;
dm_list_iterate_items(rl, raw_list) {
/* FIXME Cache this; rescan below if some missing */
if (!_raw_holds_vgname(fid, &rl->dev_area, vgname))
continue;
if (!(mda = dm_pool_zalloc(fmt->cmd->mem, sizeof(*mda))))
return_NULL;
if (!(mdac = dm_pool_zalloc(fmt->cmd->mem, sizeof(*mdac))))
return_NULL;
mda->metadata_locn = mdac;
/* FIXME Allow multiple dev_areas inside area */
memcpy(&mdac->area, &rl->dev_area, sizeof(mdac->area));
mda->ops = &_metadata_text_raw_ops;
mda->status = 0;
/* FIXME MISTAKE? mda->metadata_locn = context; */
fid_add_mda(fid, mda);
}
/* Scan PVs in VG for any further MDAs */
lvmcache_label_scan(fmt->cmd, 0);
if (!(vginfo = vginfo_from_vgname(vgname, vgid)))
goto_out;
dm_list_iterate_items(info, &vginfo->infos) {
if (!fid_add_mdas(fid, &info->mdas))
return_NULL;
}
/* FIXME Check raw metadata area count - rescan if required */
}
out:
return fid;
}
void *create_text_context(struct cmd_context *cmd, const char *path,
const char *desc)
{
struct text_context *tc;
char *tmp;
if ((tmp = strstr(path, ".tmp")) && (tmp == path + strlen(path) - 4)) {
log_error("%s: Volume group filename may not end in .tmp",
path);
return NULL;
}
if (!(tc = dm_pool_alloc(cmd->mem, sizeof(*tc))))
return_NULL;
if (!(tc->path_live = dm_pool_strdup(cmd->mem, path)))
goto_bad;
if (!(tc->path_edit = dm_pool_alloc(cmd->mem, strlen(path) + 5)))
goto_bad;
sprintf(tc->path_edit, "%s.tmp", path);
if (!desc)
desc = "";
if (!(tc->desc = dm_pool_strdup(cmd->mem, desc)))
goto_bad;
return (void *) tc;
bad:
dm_pool_free(cmd->mem, tc);
log_error("Couldn't allocate text format context object.");
return NULL;
}
static struct format_handler _text_handler = {
.scan = _text_scan,
.pv_read = _text_pv_read,
.pv_setup = _text_pv_setup,
.pv_write = _text_pv_write,
.vg_setup = _text_vg_setup,
.lv_setup = _text_lv_setup,
.create_instance = _text_create_text_instance,
.destroy_instance = _text_destroy_instance,
.destroy = _text_destroy
};
static int _add_dir(const char *dir, struct dm_list *dir_list)
{
struct dir_list *dl;
if (dm_create_dir(dir)) {
if (!(dl = dm_malloc(sizeof(struct dm_list) + strlen(dir) + 1))) {
log_error("_add_dir allocation failed");
return 0;
}
log_very_verbose("Adding text format metadata dir: %s", dir);
strcpy(dl->dir, dir);
dm_list_add(dir_list, &dl->list);
return 1;
}
return 0;
}
static int _get_config_disk_area(struct cmd_context *cmd,
const struct config_node *cn, struct dm_list *raw_list)
{
struct device_area dev_area;
const char *id_str;
struct id id;
if (!(cn = cn->child)) {
log_error("Empty metadata disk_area section of config file");
return 0;
}
if (!get_config_uint64(cn, "start_sector", &dev_area.start)) {
log_error("Missing start_sector in metadata disk_area section "
"of config file");
return 0;
}
dev_area.start <<= SECTOR_SHIFT;
if (!get_config_uint64(cn, "size", &dev_area.size)) {
log_error("Missing size in metadata disk_area section "
"of config file");
return 0;
}
dev_area.size <<= SECTOR_SHIFT;
if (!get_config_str(cn, "id", &id_str)) {
log_error("Missing uuid in metadata disk_area section "
"of config file");
return 0;
}
if (!id_read_format(&id, id_str)) {
log_error("Invalid uuid in metadata disk_area section "
"of config file: %s", id_str);
return 0;
}
if (!(dev_area.dev = device_from_pvid(cmd, &id, NULL))) {
char buffer[64] __attribute__((aligned(8)));
if (!id_write_format(&id, buffer, sizeof(buffer)))
log_error("Couldn't find device.");
else
log_error("Couldn't find device with uuid '%s'.",
buffer);
return 0;
}
return _add_raw(raw_list, &dev_area);
}
struct format_type *create_text_format(struct cmd_context *cmd)
{
struct format_type *fmt;
const struct config_node *cn;
const struct config_value *cv;
struct mda_lists *mda_lists;
if (!(fmt = dm_malloc(sizeof(*fmt))))
return_NULL;
fmt->cmd = cmd;
fmt->ops = &_text_handler;
fmt->name = FMT_TEXT_NAME;
fmt->alias = FMT_TEXT_ALIAS;
fmt->orphan_vg_name = ORPHAN_VG_NAME(FMT_TEXT_NAME);
fmt->features = FMT_SEGMENTS | FMT_MDAS | FMT_TAGS | FMT_PRECOMMIT |
FMT_UNLIMITED_VOLS | FMT_RESIZE_PV |
FMT_UNLIMITED_STRIPESIZE;
if (!(mda_lists = dm_malloc(sizeof(struct mda_lists)))) {
log_error("Failed to allocate dir_list");
dm_free(fmt);
return NULL;
}
dm_list_init(&mda_lists->dirs);
dm_list_init(&mda_lists->raws);
mda_lists->file_ops = &_metadata_text_file_ops;
mda_lists->raw_ops = &_metadata_text_raw_ops;
fmt->private = (void *) mda_lists;
if (!(fmt->labeller = text_labeller_create(fmt))) {
log_error("Couldn't create text label handler.");
dm_free(fmt);
return NULL;
}
if (!(label_register_handler(FMT_TEXT_NAME, fmt->labeller))) {
log_error("Couldn't register text label handler.");
dm_free(fmt);
return NULL;
}
if ((cn = find_config_tree_node(cmd, "metadata/dirs"))) {
for (cv = cn->v; cv; cv = cv->next) {
if (cv->type != CFG_STRING) {
log_error("Invalid string in config file: "
"metadata/dirs");
goto err;
}
if (!_add_dir(cv->v.str, &mda_lists->dirs)) {
log_error("Failed to add %s to text format "
"metadata directory list ", cv->v.str);
goto err;
}
cmd->independent_metadata_areas = 1;
}
}
if ((cn = find_config_tree_node(cmd, "metadata/disk_areas"))) {
for (cn = cn->child; cn; cn = cn->sib) {
if (!_get_config_disk_area(cmd, cn, &mda_lists->raws))
goto err;
cmd->independent_metadata_areas = 1;
}
}
log_very_verbose("Initialised format: %s", fmt->name);
return fmt;
err:
_free_dirs(&mda_lists->dirs);
dm_free(fmt);
return NULL;
}
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