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mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/lib/cache/lvmetad.c
Zdenek Kabelac fd417db274 check: add internal errors for unexpected paths
Adding couple INTERNAL_ERROR reports for unwanted parameters:

Ensure the 'top' metadata node cannot be NULL for lvmetad.

Make obvious vginfo2 cannot be NULL.

Report internal error if handler and vg is undefined.

Check for handle in poll_vg().

Ensure seg is not NULL in dev_manager_transient().

Report missing read_ahead for _lv_read_ahead_single().

Check for report handler in dm_report_object().

Check missing VG in _vgreduce_single().
2012-08-23 14:37:52 +02:00

752 lines
18 KiB
C

/*
* Copyright (C) 2012 Red Hat, Inc.
*
* 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 "toolcontext.h"
#include "metadata.h"
#include "device.h"
#include "lvmetad.h"
#include "lvmcache.h"
#include "lvmetad-client.h"
#include "format-text.h" // TODO for disk_locn, used as a DA representation
static int _using_lvmetad = 0;
static daemon_handle _lvmetad;
void lvmetad_init(void)
{
const char *socket = getenv("LVM_LVMETAD_SOCKET");
if (_using_lvmetad) { /* configured by the toolcontext */
_lvmetad = lvmetad_open(socket ?: DEFAULT_RUN_DIR "/lvmetad.socket");
if (_lvmetad.socket_fd < 0 || _lvmetad.error) {
log_warn("WARNING: Failed to connect to lvmetad: %s. Falling back to internal scanning.", strerror(_lvmetad.error));
_using_lvmetad = 0;
}
}
}
/*
* Helper; evaluate the reply from lvmetad, check for errors, print diagnostics
* and return a summary success/failure exit code.
*
* If found is set, *found indicates whether or not device exists,
* and missing device is not treated as an error.
*/
static int _lvmetad_handle_reply(daemon_reply reply, const char *action, const char *object,
int *found)
{
if (reply.error) {
log_error("Request to %s %s%sin lvmetad gave response %s.",
action, object, *object ? " " : "", strerror(reply.error));
return 0;
}
/* All OK? */
if (!strcmp(daemon_reply_str(reply, "response", ""), "OK")) {
if (found)
*found = 1;
return 1;
}
/* Unknown device permitted? */
if (found && !strcmp(daemon_reply_str(reply, "response", ""), "unknown")) {
log_very_verbose("Request to %s %s%sin lvmetad did not find object.",
action, object, *object ? " " : "");
*found = 0;
return 1;
}
log_error("Request to %s %s%sin lvmetad gave response %s. Reason: %s",
action, object, *object ? " " : "",
daemon_reply_str(reply, "response", "<missing>"),
daemon_reply_str(reply, "reason", "<missing>"));
return 0;
}
static int _read_mda(struct lvmcache_info *info,
struct format_type *fmt,
const struct dm_config_node *cn)
{
struct metadata_area_ops *ops;
dm_list_iterate_items(ops, &fmt->mda_ops)
if (ops->mda_import_text && ops->mda_import_text(info, cn))
return 1;
return 0;
}
static struct lvmcache_info *_pv_populate_lvmcache(
struct cmd_context *cmd, struct dm_config_node *cn, dev_t fallback)
{
struct device *device;
struct id pvid, vgid;
char mda_id[32];
char da_id[32];
int i = 0;
struct dm_config_node *mda = NULL;
struct dm_config_node *da = NULL;
uint64_t offset, size;
struct lvmcache_info *info;
const char *pvid_txt = dm_config_find_str(cn->child, "id", NULL),
*vgid_txt = dm_config_find_str(cn->child, "vgid", NULL),
*vgname = dm_config_find_str(cn->child, "vgname", NULL),
*fmt_name = dm_config_find_str(cn->child, "format", NULL);
dev_t devt = dm_config_find_int(cn->child, "device", 0);
uint64_t devsize = dm_config_find_int64(cn->child, "dev_size", 0),
label_sector = dm_config_find_int64(cn->child, "label_sector", 0);
struct format_type *fmt = fmt_name ? get_format_by_name(cmd, fmt_name) : NULL;
if (!fmt) {
log_error("PV %s not recognised. Is the device missing?", pvid_txt);
return NULL;
}
device = dev_cache_get_by_devt(devt, cmd->filter);
if (!device && fallback)
device = dev_cache_get_by_devt(fallback, cmd->filter);
if (!device) {
log_error("No device found for PV %s.", pvid_txt);
return NULL;
}
if (!pvid_txt || !id_read_format(&pvid, pvid_txt)) {
log_error("Missing or ill-formatted PVID for PV: %s.", pvid_txt);
return NULL;
}
if (vgid_txt)
id_read_format(&vgid, vgid_txt);
else
strcpy((char*)&vgid, fmt->orphan_vg_name);
if (!vgname)
vgname = fmt->orphan_vg_name;
if (!(info = lvmcache_add(fmt->labeller, (const char *)&pvid, device,
vgname, (const char *)&vgid, 0)))
return_NULL;
lvmcache_get_label(info)->sector = label_sector;
lvmcache_set_device_size(info, devsize);
lvmcache_del_das(info);
lvmcache_del_mdas(info);
do {
sprintf(mda_id, "mda%d", i);
mda = dm_config_find_node(cn->child, mda_id);
if (mda)
_read_mda(info, fmt, mda);
++i;
} while (mda);
i = 0;
do {
sprintf(da_id, "da%d", i);
da = dm_config_find_node(cn->child, da_id);
if (da) {
if (!dm_config_get_uint64(da->child, "offset", &offset)) return_0;
if (!dm_config_get_uint64(da->child, "size", &size)) return_0;
lvmcache_add_da(info, offset, size);
}
++i;
} while (da);
return info;
}
struct volume_group *lvmetad_vg_lookup(struct cmd_context *cmd, const char *vgname, const char *vgid)
{
struct volume_group *vg = NULL;
daemon_reply reply;
char uuid[64];
struct format_instance *fid;
struct format_instance_ctx fic;
struct dm_config_node *top;
const char *name;
const char *fmt_name;
struct format_type *fmt;
struct dm_config_node *pvcn;
struct pv_list *pvl;
struct lvmcache_info *info;
if (!_using_lvmetad)
return NULL;
if (vgid) {
if (!id_write_format((const struct id*)vgid, uuid, sizeof(uuid)))
return_NULL;
reply = daemon_send_simple(_lvmetad, "vg_lookup", "uuid = %s", uuid, NULL);
} else {
if (!vgname)
log_error(INTERNAL_ERROR "VG name required (VGID not available)");
reply = daemon_send_simple(_lvmetad, "vg_lookup", "name = %s", vgname, NULL);
}
if (!strcmp(daemon_reply_str(reply, "response", ""), "OK")) {
if (!(top = dm_config_find_node(reply.cft->root, "metadata"))) {
log_error(INTERNAL_ERROR "metadata config node not found.");
goto out;
}
name = daemon_reply_str(reply, "name", NULL);
/* fall back to lvm2 if we don't know better */
fmt_name = dm_config_find_str(top, "metadata/format", "lvm2");
if (!(fmt = get_format_by_name(cmd, fmt_name))) {
log_error(INTERNAL_ERROR
"We do not know the format (%s) reported by lvmetad.",
fmt_name);
goto out;
}
fic.type = FMT_INSTANCE_MDAS | FMT_INSTANCE_AUX_MDAS;
fic.context.vg_ref.vg_name = name;
fic.context.vg_ref.vg_id = vgid;
if (!(fid = fmt->ops->create_instance(fmt, &fic)))
goto_out;
if ((pvcn = dm_config_find_node(top, "metadata/physical_volumes")))
for (pvcn = pvcn->child; pvcn; pvcn = pvcn->sib)
_pv_populate_lvmcache(cmd, pvcn, 0);
top->key = name;
if (!(vg = import_vg_from_config_tree(reply.cft, fid)))
goto_out;
dm_list_iterate_items(pvl, &vg->pvs) {
if ((info = lvmcache_info_from_pvid((const char *)&pvl->pv->id, 0))) {
pvl->pv->label_sector = lvmcache_get_label(info)->sector;
pvl->pv->dev = lvmcache_device(info);
if (!lvmcache_fid_add_mdas_pv(info, fid)) {
vg = NULL;
goto_out; /* FIXME error path */
}
} /* else probably missing */
}
lvmcache_update_vg(vg, 0);
}
out:
daemon_reply_destroy(reply);
return vg;
}
struct _fixup_baton {
int i;
int find;
int ignore;
};
static int _fixup_ignored(struct metadata_area *mda, void *baton) {
struct _fixup_baton *b = baton;
if (b->i == b->find)
mda_set_ignored(mda, b->ignore);
b->i ++;
return 1;
}
int lvmetad_vg_update(struct volume_group *vg)
{
char *buf = NULL;
daemon_reply reply;
struct dm_hash_node *n;
struct metadata_area *mda;
char mda_id[128], *num;
struct pv_list *pvl;
struct lvmcache_info *info;
struct _fixup_baton baton;
if (!vg)
return 0;
if (!_using_lvmetad || test_mode())
return 1; /* fake it */
/* TODO. This is not entirely correct, since export_vg_to_buffer
* adds trailing nodes to the buffer. We may need to use
* export_vg_to_config_tree and format the buffer ourselves. It
* does, however, work for now, since the garbage is well
* formatted and has no conflicting keys with the rest of the
* request. */
if (!export_vg_to_buffer(vg, &buf)) {
log_error("Could not format VG metadata.");
return 0;
}
reply = daemon_send_simple(_lvmetad, "vg_update", "vgname = %s", vg->name,
"metadata = %b", strchr(buf, '{'), NULL);
dm_free(buf);
if (!_lvmetad_handle_reply(reply, "update VG", vg->name, NULL)) {
daemon_reply_destroy(reply);
return 0;
}
daemon_reply_destroy(reply);
n = (vg->fid && vg->fid->metadata_areas_index) ?
dm_hash_get_first(vg->fid->metadata_areas_index) : NULL;
while (n) {
mda = dm_hash_get_data(vg->fid->metadata_areas_index, n);
strcpy(mda_id, dm_hash_get_key(vg->fid->metadata_areas_index, n));
if ((num = strchr(mda_id, '_'))) {
*num = 0;
++num;
if ((info = lvmcache_info_from_pvid(mda_id, 0))) {
memset(&baton, 0, sizeof(baton));
baton.find = atoi(num);
baton.ignore = mda_is_ignored(mda);
lvmcache_foreach_mda(info, _fixup_ignored, &baton);
}
}
n = dm_hash_get_next(vg->fid->metadata_areas_index, n);
}
dm_list_iterate_items(pvl, &vg->pvs) {
/* NB. the PV fmt pointer is sometimes wrong during vgconvert */
if (pvl->pv->dev && !lvmetad_pv_found(pvl->pv->id, pvl->pv->dev,
vg->fid ? vg->fid->fmt : pvl->pv->fmt,
pvl->pv->label_sector, NULL, NULL))
return 0;
}
return 1;
}
int lvmetad_vg_remove(struct volume_group *vg)
{
char uuid[64];
daemon_reply reply;
int result;
if (!_using_lvmetad || test_mode())
return 1; /* just fake it */
if (!id_write_format(&vg->id, uuid, sizeof(uuid)))
return_0;
reply = daemon_send_simple(_lvmetad, "vg_remove", "uuid = %s", uuid, NULL);
result = _lvmetad_handle_reply(reply, "remove VG", vg->name, NULL);
daemon_reply_destroy(reply);
return result;
}
int lvmetad_pv_lookup(struct cmd_context *cmd, struct id pvid, int *found)
{
char uuid[64];
daemon_reply reply;
int result = 0;
struct dm_config_node *cn;
if (!_using_lvmetad)
return_0;
if (!id_write_format(&pvid, uuid, sizeof(uuid)))
return_0;
reply = daemon_send_simple(_lvmetad, "pv_lookup", "uuid = %s", uuid, NULL);
if (!_lvmetad_handle_reply(reply, "lookup PV", "", found))
goto_out;
if (found && !*found)
goto out_success;
if (!(cn = dm_config_find_node(reply.cft->root, "physical_volume")))
goto_out;
else if (!_pv_populate_lvmcache(cmd, cn, 0))
goto_out;
out_success:
result = 1;
out:
daemon_reply_destroy(reply);
return result;
}
int lvmetad_pv_lookup_by_dev(struct cmd_context *cmd, struct device *dev, int *found)
{
int result = 0;
daemon_reply reply;
struct dm_config_node *cn;
if (!_using_lvmetad)
return_0;
reply = daemon_send_simple(_lvmetad, "pv_lookup", "device = %d", dev->dev, NULL);
if (!_lvmetad_handle_reply(reply, "lookup PV", dev_name(dev), found))
goto_out;
if (found && !*found)
goto out_success;
cn = dm_config_find_node(reply.cft->root, "physical_volume");
if (!cn || !_pv_populate_lvmcache(cmd, cn, dev->dev))
goto_out;
out_success:
result = 1;
out:
daemon_reply_destroy(reply);
return result;
}
int lvmetad_pv_list_to_lvmcache(struct cmd_context *cmd)
{
daemon_reply reply;
struct dm_config_node *cn;
if (!_using_lvmetad)
return 1;
reply = daemon_send_simple(_lvmetad, "pv_list", NULL);
if (!_lvmetad_handle_reply(reply, "list PVs", "", NULL)) {
daemon_reply_destroy(reply);
return_0;
}
if ((cn = dm_config_find_node(reply.cft->root, "physical_volumes")))
for (cn = cn->child; cn; cn = cn->sib)
_pv_populate_lvmcache(cmd, cn, 0);
daemon_reply_destroy(reply);
return 1;
}
int lvmetad_vg_list_to_lvmcache(struct cmd_context *cmd)
{
struct volume_group *tmp;
struct id vgid;
const char *vgid_txt;
daemon_reply reply;
struct dm_config_node *cn;
if (!_using_lvmetad)
return 1;
reply = daemon_send_simple(_lvmetad, "vg_list", NULL);
if (!_lvmetad_handle_reply(reply, "list VGs", "", NULL)) {
daemon_reply_destroy(reply);
return_0;
}
if ((cn = dm_config_find_node(reply.cft->root, "volume_groups")))
for (cn = cn->child; cn; cn = cn->sib) {
vgid_txt = cn->key;
if (!id_read_format(&vgid, vgid_txt)) {
stack;
continue;
}
/* the call to lvmetad_vg_lookup will poke the VG into lvmcache */
tmp = lvmetad_vg_lookup(cmd, NULL, (const char*)&vgid);
release_vg(tmp);
}
daemon_reply_destroy(reply);
return 1;
}
struct _print_mda_baton {
int i;
char *buffer;
};
static int _print_mda(struct metadata_area *mda, void *baton)
{
int result = 0;
struct _print_mda_baton *b = baton;
char *buf, *mda_txt;
if (!mda->ops->mda_export_text) /* do nothing */
return 1;
buf = b->buffer;
mda_txt = mda->ops->mda_export_text(mda);
if (!dm_asprintf(&b->buffer, "%s mda%i { %s }", b->buffer ?: "", b->i, mda_txt))
goto_out;
b->i ++;
result = 1;
out:
dm_free(mda_txt);
dm_free(buf);
return result;
}
static int _print_da(struct disk_locn *da, void *baton)
{
struct _print_mda_baton *b;
char *buf;
if (!da)
return 1;
b = baton;
buf = b->buffer;
if (!dm_asprintf(&b->buffer, "%s da%i { offset = %" PRIu64
" size = %" PRIu64 " }",
b->buffer ?: "", b->i, da->offset, da->size))
{
dm_free(buf);
return_0;
}
b->i ++;
dm_free(buf);
return 1;
}
static const char *_print_mdas(struct lvmcache_info *info)
{
struct _print_mda_baton baton = { .i = 0, .buffer = NULL };
if (!lvmcache_foreach_mda(info, &_print_mda, &baton))
return NULL;
baton.i = 0;
if (!lvmcache_foreach_da(info, &_print_da, &baton))
return NULL;
return baton.buffer;
}
int lvmetad_pv_found(struct id pvid, struct device *device, const struct format_type *fmt,
uint64_t label_sector, struct volume_group *vg, activation_handler handler)
{
char uuid[64];
daemon_reply reply;
struct lvmcache_info *info;
const char *mdas = NULL;
char *pvmeta;
char *buf = NULL;
const char *status;
int result;
if (!_using_lvmetad || test_mode())
return 1;
if (!id_write_format(&pvid, uuid, sizeof(uuid)))
return_0;
/* FIXME A more direct route would be much preferable. */
if ((info = lvmcache_info_from_pvid((const char *)&pvid, 0)))
mdas = _print_mdas(info);
if (!dm_asprintf(&pvmeta,
"{ device = %" PRIu64 "\n"
" dev_size = %" PRIu64 "\n"
" format = \"%s\"\n"
" label_sector = %" PRIu64 "\n"
" id = \"%s\"\n"
" %s"
"}", device->dev,
info ? lvmcache_device_size(info) : 0,
fmt->name, label_sector, uuid, mdas ?: "")) {
dm_free((char *)mdas);
return_0;
}
dm_free((char *)mdas);
if (vg) {
/*
* TODO. This is not entirely correct, since export_vg_to_buffer
* adds trailing garbage to the buffer. We may need to use
* export_vg_to_config_tree and format the buffer ourselves. It
* does, however, work for now, since the garbage is well
* formatted and has no conflicting keys with the rest of the
* request.
*/
if (!export_vg_to_buffer(vg, &buf)) {
dm_free(pvmeta);
return_0;
}
reply = daemon_send_simple(_lvmetad,
"pv_found",
"pvmeta = %b", pvmeta,
"vgname = %s", vg->name,
"metadata = %b", strchr(buf, '{'),
NULL);
} else {
if (handler) {
log_error(INTERNAL_ERROR "Handler needs existing VG.");
dm_free(pvmeta);
return 0;
}
/* There are no MDAs on this PV. */
reply = daemon_send_simple(_lvmetad,
"pv_found",
"pvmeta = %b", pvmeta,
NULL);
}
dm_free(pvmeta);
result = _lvmetad_handle_reply(reply, "update PV", uuid, NULL);
if (result && handler) {
status = daemon_reply_str(reply, "status", "<missing>");
if (!strcmp(status, "partial"))
handler(vg, 1, CHANGE_AAY);
else if (!strcmp(status, "complete"))
handler(vg, 0, CHANGE_AAY);
else if (!strcmp(status, "orphan"))
;
else
log_error("Request to %s %s in lvmetad gave status %s.",
"update PV", uuid, status);
}
daemon_reply_destroy(reply);
return result;
}
int lvmetad_pv_gone(dev_t device, const char *pv_name, activation_handler handler)
{
daemon_reply reply;
int result;
int found;
if (!_using_lvmetad || test_mode())
return 1;
/*
* TODO: automatic volume deactivation takes place here *before*
* all cached info is gone - call handler. Also, consider
* integrating existing deactivation script that deactivates
* the whole stack from top to bottom (not yet upstream).
*/
reply = daemon_send_simple(_lvmetad, "pv_gone", "device = %d", device, NULL);
result = _lvmetad_handle_reply(reply, "drop PV", pv_name, &found);
/* We don't care whether or not the daemon had the PV cached. */
daemon_reply_destroy(reply);
return result;
}
int lvmetad_pv_gone_by_dev(struct device *dev, activation_handler handler)
{
return lvmetad_pv_gone(dev->dev, dev_name(dev), handler);
}
int lvmetad_active(void)
{
return _using_lvmetad;
}
void lvmetad_set_active(int active)
{
_using_lvmetad = active;
}
/*
* The following code implements pvscan --cache.
*/
struct _pvscan_lvmetad_baton {
struct volume_group *vg;
struct format_instance *fid;
};
static int _pvscan_lvmetad_single(struct metadata_area *mda, void *baton)
{
struct _pvscan_lvmetad_baton *b = baton;
struct volume_group *this = mda->ops->vg_read(b->fid, "", mda, 1);
/* FIXME Also ensure contents match etc. */
if (!b->vg || this->seqno > b->vg->seqno)
b->vg = this;
else if (b->vg)
release_vg(this);
return 1;
}
int pvscan_lvmetad_single(struct cmd_context *cmd, struct device *dev,
activation_handler handler)
{
struct label *label;
struct lvmcache_info *info;
struct _pvscan_lvmetad_baton baton;
/* Create a dummy instance. */
struct format_instance_ctx fic = { .type = 0 };
if (!lvmetad_active()) {
log_error("Cannot proceed since lvmetad is not active.");
return 0;
}
if (!label_read(dev, &label, 0)) {
log_print("No PV label found on %s.", dev_name(dev));
if (!lvmetad_pv_gone_by_dev(dev, handler))
goto_bad;
return 1;
}
info = (struct lvmcache_info *) label->info;
baton.vg = NULL;
baton.fid = lvmcache_fmt(info)->ops->create_instance(lvmcache_fmt(info),
&fic);
if (!baton.fid)
goto_bad;
lvmcache_foreach_mda(info, _pvscan_lvmetad_single, &baton);
if (!baton.vg)
lvmcache_fmt(info)->ops->destroy_instance(baton.fid);
/*
* NB. If this command failed and we are relying on lvmetad to have an
* *exact* image of the system, the lvmetad instance that went out of
* sync needs to be killed.
*/
if (!lvmetad_pv_found(*(struct id *)dev->pvid, dev, lvmcache_fmt(info),
label->sector, baton.vg, handler)) {
release_vg(baton.vg);
goto_bad;
}
release_vg(baton.vg);
return 1;
bad:
/* FIXME kill lvmetad automatically if we can */
log_error("Update of lvmetad failed. This is a serious problem.\n "
"It is strongly recommended that you restart lvmetad immediately.");
return 0;
}